INSERT DEVICE FOR FUEL INJECTION

BACKGROUND
Technical Field

The subject matter described herein relates to devices and methods for mixing fuel and air into a fuel-and-air mixture prior to injection of the mixture into engine cylinders.

Discussion of Art

In a compression ignition engine, fuel may be directly injected into compressed hot gases, such as air or a mixture of air and recycled exhaust gas. The fuel mixes with these in-cylinder gases near the site of injection of the fuel into the cylinders of the engine. As the relatively cool fuel mixes with the higher temperature gases, the resulting mixture reaches a temperature sufficient for ignition. This may be a dynamic event and fuel may be ignited and may burn at the head of a fuel spray plume while fuel continues to be injected into the other end of the spray plume.

As the temperature of the gases entrained into the injected fuel remains elevated, the delay between injection of the fuel and ignition of the fuel-and-air mixture in a cylinder may be reduced. This may cause the fuel spray plume to have a sub-optimal fuel-and-air mix ratio before initial ignition, which may produce soot. The production and consequential build-up of soot may degrade performance of the engine and eventually require cleaning or other repair of the engine. Additionally, certain regulations or laws may restrict how much particulate matter or other emissions can be generated by engines.

Insert devices may be placed between fuel injectors and combustion chambers of engine cylinders to mix fuel and air before the mixture of fuel and air is directed into the combustion chambers. These insert devices can be exposed to extreme temperatures, which can introduce mechanical stress to the insert devices due to these devices having different coefficients of thermal expansion (CTE) than the cylinder heads to which the insert devices are coupled. This stress can damage or destroy the insert devices and/or cylinder heads. Accordingly, a need exists for insert devices that reduce or eliminate these stresses to increase the useful lives of the insert devices.

Additionally, the insert devices may include conduits through which fuel is received from fuel injectors. The conduits can be difficult to align with holes in the fuel injectors from which the fuel is ejected due to the small distances between the fuel injectors and the insert devices. Misalignment of the conduits of the insert devices and holes in the fuel injectors may interfere with the flow of fuel into the engine cylinders and can be detrimental to operation of the cylinders. Therefore, another need exists for a way to align the conduits of the insert devices with holes in fuel injectors.

BRIEF DESCRIPTION

In one example, an insert device may include a body that can be coupled with an engine cylinder head. The body may have an interior surface extending around a center axis and shaped to receive and engage a distal tip of a fuel injector. The body may have gas conduits and mixture conduits. The gas conduits can extend from inlets disposed along an exterior surface of the body to outlets that intersect the mixture conduits. The mixture conduits may extend from inlets disposed along the interior surface of the body to outlets disposed along the exterior surface of the body. The gas conduits can be positioned to direct one or more gases outside of the body into the mixture conduits. The mixture conduits may be positioned to receive fuel from spray holes of the distal tip of the fuel injector. The mixture conduits can entrain the gas with the fuel into a fuel-and-gas mixture that is directed out of the outlets of the mixture conduits and into a combustion chamber of an engine cylinder.

In another example, another insert device may include an annular body that can be coupled with an engine cylinder head. The body may have an interior surface extending around a center axis and shaped to receive and engage a fuel injector such that the fuel injector directly abuts the interior surface of the body. The body may have gas conduits and mixture conduits. The gas conduits can extend from inlets disposed along an exterior surface of the body to outlets that intersect the mixture conduits between the interior surface and the exterior surface of the body. The mixture conduits may extend from inlets disposed along the interior surface of the body to outlets disposed along the exterior surface of the body. The gas conduits can be positioned to direct one or more gases outside of the body into the mixture conduits. The mixture conduits may be positioned to receive fuel from the fuel injector. The mixture conduits can entrain the gas with the fuel into a fuel-and-gas mixture that is directed out of the outlets of the mixture conduits and into a combustion chamber of an engine cylinder.

In another example, another insert device may include a body that can be coupled with an engine cylinder head of an engine cylinder. The body may extend along the center axis from a first end surface that faces away from a combustion chamber of the engine cylinder to an opposite second end surface that faces the combustion chamber of the engine cylinder. The body may have an interior surface extending around a center axis and shaped to receive and engage a distal tip of a fuel injector. The body can include gas conduits and mixture conduits. The gas conduits may extend from inlets disposed along an exterior surface of the body to outlets that intersect the mixture conduits. At least a first gas conduit of the gas conduits may be disposed between at least one of the mixture conduits and the first end surface of the body. At least a second gas conduit of the gas conduits may be disposed between the at least one of the mixture conduits and the second end surface of the body. The gas conduits can be positioned to direct one or more vapors outside of the body into the mixture conduits. The mixture conduits may extend from inlets disposed along the interior surface of the body to outlets disposed along the exterior surface of the body. The mixture conduits can be positioned to receive fuel from spray holes of the distal tip of the fuel injector, the mixture conduits configured to entrain the gas with the fuel into a fuel-and-gas mixture that is directed out of the outlets of the mixture conduits and into a combustion chamber of an engine cylinder.

BRIEF DESCRIPTION OF THE DRAWINGS

The inventive subject matter may be understood from reading the following description of non-limiting embodiments, with reference to the attached drawings, wherein below:

FIG. 1 illustrates a cross-sectional view of one example of an insert device coupled to a cylinder head of an engine cylinder in an engine;

FIG. 2 illustrates a top perspective view of one example of the insert device shown in FIG. 1;

FIG. 3 illustrates a bottom perspective view of the insert device shown in FIG. 2;

FIG. 4 illustrates a side elevational view of the insert device shown in FIG. 2;

FIG. 5 illustrates a top plan view of the insert device shown in FIG. 2;

FIG. 6 illustrates a bottom plan view of the insert device shown in FIG. 2;

FIG. 7 illustrates a cross-sectional view of one example of the insert device shown in FIG. 2 coupled with a cylinder head of an engine cylinder;

FIG. 8 illustrates another cross-sectional view of one example of the insert device shown in FIG. 2 coupled with the cylinder head of the engine cylinder;

FIG. 9 illustrates a cross-sectional view of the insert device along line 8-8 shown in FIG. 4;

FIG. 10 illustrates a top perspective view of another example of an insert device;

FIG. 11 illustrates a bottom perspective view of the insert device shown in FIG. 10;

FIG. 12 illustrates a side elevational view of the insert device shown in FIG. 10;

FIG. 13 illustrates a top plan view of the insert device shown in FIG. 10;

FIG. 14 illustrates a bottom plan view of the insert device shown in FIG. 10;

FIG. 15 illustrates a cross-sectional view of one example of the insert device shown in FIG. 10 coupled with a cylinder head of an engine cylinder;

FIG. 16 illustrates a top perspective view of another example of an insert device;

FIG. 17 illustrates a bottom perspective view of the insert device shown in FIG. 16;

FIG. 18 illustrates a side elevational view of the insert device shown in FIG. 16;

FIG. 19 illustrates a top plan view of the insert device shown in FIG. 16;

FIG. 20 illustrates a bottom plan view of the insert device shown in FIG. 16;

FIG. 21 illustrates another example of an insert device;

FIG. 22 illustrates a cross-sectional view of the insert device shown in FIG. 21 coupled with a cylinder head; and

FIG. 23 illustrates another example of an insert device.

DETAILED DESCRIPTION

Embodiments of the subject matter described herein relate to insert devices and methods that mix combustible fuel and gas (e.g., one or more vapors, such as air, exhaust, gaseous combustible fuel, or a combination of two or more of air, exhaust, and/or gaseous fuel) into a fuel-and-gas (or fuel-and-air) mixture that is then directed into engine cylinders. After the fuel and gas are mixed, entrained, or pre-mixed (e.g., mixed prior to entry into the combustion chamber of an engine cylinder), the mixture can be explosive and, therefore, dangerous. As a result, it may be desirable to keep the fuel and gas separate and not mixed for longer periods of time (or as long as possible given the short duty or combustion cycles of an engine cylinder). However, keeping the fuel and gas separate for too long can reduce or prevent combustion (and lead to incomplete combustion in the cylinder, which can decrease output or power of the engine). While using exhaust (e.g., in an exhaust gas recirculation, or EGR, engine system) can reduce the risk of explosion (relative to air being used as the gas), the exhaust tends to be at elevated temperatures, which can increase the risk of premature ignition of the fuel. This also can reduce the output or power of the engine. As a result, failing to pre-mix may lead to incomplete combustion while early pre-mixing may increase the risk of premature ignition.

One or more examples of the insert devices described herein can keep the fuel and gas separate long enough to reduce or eliminate the risk of premature ignition (e.g., the fuel igniting prior to an ignition cycle of the cylinder that the fuel is to ignite during), while mixing the fuel and gas prior to directing the mixture into the combustion chamber of the cylinder and cooling the fuel-and-gas mixture to reduce soot or other nitrous oxide emissions, or NOx (e.g., relative to the same fuel, the same engine, etc., operating without the insert device).

The insert devices described herein may affect and/or control an ignition delay of the fuel (e.g., by delaying the ignition relative to the time of injection). Ignition control may allow for a different (e.g., leaner) fuel-and-air mixture to be achieved prior to the mixture arriving at a region of combustion to ignite or combust. Several concepts are described herein that facilitate this modification of the fuel combustion event. Although tubes and ducts may be used in some assemblies, other insert devices define channels, flow paths, conduits, and the like and do not include a tube structure nor include a duct structure within the combustion chamber of a cylinder. Some devices having tubes or ducts have been shown to suffer from catastrophic failures, such as explosions occurring within the tubes.

With reference to some of such concepts, the insert devices may be placed in cylinder heads between fuel injectors and pistons inside engine cylinders, or may be disposed on top of the pistons. The insert devices may control (e.g., reduce) an amount of hot gas that is entrained into an injected fuel stream. A fuel injector may inject the fuel and may have a nozzle that forms a plurality of fuel streams. By adding in these insert devices, the fuel and air may have more time to mix prior to igniting in the engine cylinders. Additionally, the ratio of fuel to gas/air may be controlled, which may reduce or eliminate the production of certain exhaust products (e.g., soot, NOx) during the combustion process. The inventive insert devices described herein also can be referred to as mixing structures or mixing assemblies.

By adding these insert devices to engines, the devices may contact the hot gas and air to act as a heat sink. In this way, the insert devices may locally cool the previously hot gas/air as the gas/air is incorporated into, entrained, and/or swept along with a fuel stream plume inside the insert devices. The insert devices may cool the gases that may be entrained into fuel streams injected into the cylinders. A cooler mixture may delay ignition and thereby reduce an amount of soot generated or prevent generation of soot altogether. Various embodiments of the insert devices may be referred to as a soot reduction assembly or an engine assembly. As used herein, the terms gas or gases are inclusive of air, a combination of air and recycled exhaust gas (EGR), a combination of air and other diluents (e.g., water vapor, CO2, and/or N2, etc.), air modified to change the oxygen concentration, and a combination of any of the foregoing with or without aspirated natural gas.

Alternatively, one or more embodiments of the insert devices may include ducts that align with outlets of a fuel injector to form a ducted fuel injector. The fuel injector outlets can align with the ducts inside and extending through the insert devices (from the internal volume to the external surface of the insert device).

As described herein, various embodiments of the insert devices include features or designs that reduce or eliminate mechanical stress caused by the elevated temperatures to which the insert devices are exposed. Reducing these stresses can increase the useful lives of the insert devices and/or cylinder heads.

The insert device can be additively manufactured using three-dimensional printing, direct metal laser sintering, or the like. The insert device can be formed from the same material or a combination of materials. The insert device can be a homogenous body having a consistent formulation and density throughout all of the device body. For example, the relative amounts of or ratio of weights, volumes, or both weights and volumes of materials used to form the insert device can be the same throughout all of the insert device, regardless of the size or shape of any part of the insert device. Alternatively, the insert device can be a non-homogenous body with the relative amounts of or ratio of weights, volumes, or both weights and volumes of materials differs in different locations of the insert device. The insert device may be monolithic in that the insert device is formed as a single piece body and is not created by forming separate parts that are later joined together to form the insert device. The coupling and mixing bodies of the monolithic insert device can be integrally formed with each other as a single body. The monolithic aspect or nature of the insert device can be identified or verified by an absence of any seams or interfaces between different parts that are joined together to form the insert device. Alternatively, the insert device may not be a monolithic body in that the insert device is formed as several separate pieces that are later joined together to form the insert device. The non-monolithic aspect or nature of the insert device can be identified or verified by seams or interfaces between different parts that are joined together to form the insert device.

The additive manufacturing process for forming the insert device can involve sequentially constructing the device body layer by layer. Suitable processes include, for example, selective laser melting (or sintering) and binder jetting. Selective laser melting involves depositing a layer of powder on a build plate and fusing selective portions of the power using a ytterbium fiber laser that scans a computer aided design (CAD) pattern or file. Binder jetting creates a part by intercalating metal powder and polymer binding agent that bind the particles and layers together without the use of laser heating.

Different portions of the insert device can be additively manufactured from different materials. For example, the portion of the insert device that abuts or contacts the cylinder head of an engine cylinder may be formed from a first material (e.g., metal or metal alloy, polymer, ceramic, etc.) having a CTE that is the same as or closer to the CTE of the cylinder head, while another portion of the insert device that does not abut or contact the cylinder head may be formed from another material having a CTE that is different from or farther from the CTE of the cylinder head (farther from the CTE of the cylinder head than the portion of the insert device that contacts the cylinder head).

The insert device may be created to have a shape that provides an interference fit between the insert device and the cylinder head. The shape of the insert device that provides the interference fit can have a taper to control the amount of interference (e.g., the force exerted on the cylinder head by the insert device). For example, the tapered shape of the insert device can provide a smaller pressure or force against the cylinder head in locations that are closer to the combustion chamber (where temperatures may be higher) and greater pressures or forces against the cylinder head in locations that are farther from the combustion chamber (where temperatures may be cooler).

The insert device can be formed to have an internal cutout or pocket that allow flexing of the insert device at the interference fit area (e.g., in locations that are laterally between the cylinder head and an internal volume of the insert device). As the insert device heats up, the insert device can thermally expand and flexing of the insert device can be absorbed by the internal cutout or pocket to reduce stress from thermal expansion of the insert device.

A sleeve made of a ductile material can be disposed (e.g., pressed) between the insert device and the cylinder head. The sleeve can reduce thermal expansion stresses in the cylinder head caused by the differences in CTE between the insert device and the cylinder head. The sleeve optionally can be threaded onto or into the insert device and rest against a shoulder on the cylinder head. The sleeve can support the fuel injector and retain the insert device in position relative to the fuel injector.

The fuel injector may have a flat surface on an outer perimeter of the fuel injector. The insert device can be formed to have a mating flat on an exterior surface. These flat surfaces of the fuel injector and the insert device can mate with each other to align holes or conduits in the insert device (through which fuel and air mixtures pass through and out of the insert device) with holes in the fuel injector through which fuel is ejected from the fuel injector into the insert device.

With regard to the fuel, the fuel may be a single fuel type in one embodiment and in other embodiments the fuel may be a mixture of a plurality of different fuels. In one example of a fuel mixture, a first fuel may be liquid and a second fuel may be gaseous. A suitable liquid fuel may be diesel (regular, biodiesel, HDRD, and the like), gasoline, kerosene, dimethyl ether (DME), alcohol, ethanol, and the like. A suitable gaseous fuel may be natural gas (methane) or a short chain hydrocarbon, hydrogen, ammonia, and the like. In one embodiment, fuel may be inclusive of stored energy as used herein. In that perspective, a battery state of charge, or a source of compressed gas, a flywheel, fuel cell, and other types of non-traditional fuel sources may be included.

FIG. 1 illustrates a cross-sectional view of one example of an insert device 100 coupled to a cylinder head 300 of an engine cylinder 302 in an engine. The insert device may be coupled to the cylinder head in a location between a fuel injector 304 and a crown 306 of a piston 308 in the cylinder. The piston moves toward and away from the fuel injector during operation of the engine, or up and down in the perspective of FIG. 1. In the illustrated embodiment, the insert device may be stationary as the mixing structure may be mounted or otherwise affixed to the cylinder head. For example, while the piston may move relative to the engine cylinder or other components of the engine, the insert devices described herein may be static objects that do not include any parts that move relative to each other. The piston moves toward and away from both the fuel injector and the stationary insert device. In one embodiment, the insert device may be affixed or otherwise coupled to, or incorporated into the crown of the piston such that the insert device moves with the piston toward and away from the fuel injector. The absence of moving parts of the insert device may extend the useful or service life of the insert device as there may be fewer parts to break or wear down relative to devices having parts that may move relative to each other. This also can reduce the maintenance costs involved with upkeep of the insert device, and can reduce the installation or manufacturing costs of the insert device (relative to other devices that may include moving parts).

In operation, the fuel injector injects one or more streams of fuel into the central volume of the body of the insert device. During operation, the fuel streams flow from the fuel injector through a central volume of the insert device. The pressure supplied to the fuel injector may cause all or substantially all (e.g., at least 90%) of the fuel to pass through conduits of the insert device (after mixing with gases, as described herein).

As the fuel flows into the internal volume of the insert device, the moving fuel draws gases through air passages in the device (e.g., an opening along the top of the insert device, such as the side of the insert device that faces away from the piston and generally in a direction toward the fuel injector; openings above the fuel passages; openings below the fuel passages; etc.). The gases, which may be relatively hot, may be pulled through the interior of the insert device such that the hot gases move inward from outside the insert device into a center volume of the insert device.

The insert device may cool the incoming air by operating as a heat sink and/or increasing the dwell time of the air (e.g., the duration of time over which the air flows through the insert device, mixes with fuel, and enters the engine cylinder). The at least partially cooled gases then become entrained in the flow of fuel in the insert device to form a fuel-and-gas mixture inside the insert device. This fuel-and-gas mixture may be formed before the fuel or gas enters the combustion chamber of the cylinder. The fuel and gas mixes to form the fuel-and-gas mixture, which flows out of the insert device via one or more mixture conduits. The fuel-and-gas mixture then flows into the combustion chamber of the cylinder. This fuel-and-gas mixture may be cooler than fuel-and-gas mixtures that do not flow through or mix within the insert device, which may delay ignition inside the chamber of the cylinder and prevent or reduce soot formation, as described herein.

Optionally, the conduits may be oriented to direct the fuel-and-gas mixture farther into the combustion chamber of the cylinder such that the fuel-and-gas mixture penetrates further into the combustion chamber (e.g., compared to directing the fuel and gas into the combustion chamber without mixing the fuel and gas using the insert device). For example, mixing the fuel and gas in the insert device and then directing the fuel-and-gas mixture into the combustion chamber using the insert device may change the combination of mass and velocity of the mixture jet relative to the mass and velocity that the fuel and gas jet would separately have without pre-mixing the fuel and gas in the insert device. For example, the jet with the mixing structure may be more confined (e.g., narrower) than the jet would be without the insert device. Additionally, the jet may have lower initial mass entrainment but higher velocity relative to the jet without the insert device. Without the insert device, the jet could entrain more gases earlier in the flow path, which would have a high mass within the domain of the spray and spreading the spray resulting in a lower velocity and lower penetration into the cylinder. The more concentrated, higher velocity of the mixture by the insert device causes the mixture to enter farther into the combustion chamber to locations that may be farther from the insert device (relative to not using the insert device). As the penetration of the mixture into the combustion chamber increases, soot oxidation within the combustion chamber may be enhanced, which may eliminate or reduce the amount of soot in the engine cylinder.

FIG. 2 illustrates a top perspective view of one example of an insert device 100 shown in FIG. 1. FIG. 3 illustrates a bottom perspective view of the insert device shown in FIG. 2. FIG. 4 illustrates a side elevational view of the insert device shown in FIG. 2. FIG. 5 illustrates a top plan view of the insert device shown in FIG. 2. FIG. 6 illustrates a bottom plan view of the insert device shown in FIG. 2. FIG. 7 illustrates a cross-sectional view of one example of the insert device shown in FIG. 2 coupled with a cylinder head 602 of an engine cylinder 604. FIG. 8 illustrates another cross-sectional view of one example of the insert device shown in FIG. 2 coupled with the cylinder head of the engine cylinder.

The insert device includes a first coupling body 102 that is shaped to be inserted into a receptacle 600 (shown in FIG. 7) of the cylinder head of the engine cylinder. The first coupling body can have a generally cylindrical shape with a taper, as described below. The first coupling body extends around a center axis 104 of the insert device. This center axis may extend along or parallel to the length of a fuel injector 304 (as shown in FIG. 7). The first coupling body extends around and defines a first interior volume 106 of the insert device. For example, the first coupling body can be an annular body that encircles the first interior volume. While the first coupling body is shown as having a circular shape, alternatively, the first coupling body may not have a circular shape. For example, the first coupling body may include one or more linear sides.

This first interior volume is shaped to receive a distal tip 606 (shown in FIG. 7) of the fuel injector. As shown in FIG. 7, the first interior volume may be large enough to receive the distal tip and a sleeve 616 (described below) without additional volume or space being present within the first interior volume. Alternatively, the first interior volume may be larger such that one or more open volumes or gaps are disposed between any two or more of the first coupling body, the sleeve, and the fuel injector.

The insert device also includes a second mixing body 108 that is coupled with the first coupling body. The second mixing body optionally can be referred to as a second directing body. The first and second bodies of the insert device can be different portions of a single, monolithic body, or may be separate parts that are formed separately but later joined together. The second mixing body extends around the center axis of the insert. The second mixing body may have an outwardly extending flared shape or dovetail shape such that the second mixing body transitions from a smaller outer diameter of the first coupling body to a larger outer diameter of the second mixing body.

The second mixing body includes conduits 110 that are configured (e.g., shaped and/or positioned) to receive fuel output by the fuel injector. The conduits can be referred to as mixture conduits, or entrained conduits, as these conduits may direct a combination or mixture of fuel and gas from the insert device into the combustion chamber of an engine cylinder. The conduits can extend from an interior or internal surface 114 of the insert device to the outer or external surface of the insert device. The internal surface of the insert body may encircle or otherwise extend around and face the center axis of the insert device. The conduits may be aligned with fuel spray holes 612 (shown in FIG. 7) of the fuel injector such that fuel ejected from the holes is directed into the conduits in the second mixing body. The conduits and holes may be aligned so the direction or trajectory of the fuel need not be changed for the fuel to flow or pass into and through the conduits, and out of the insert device.

The conduits also can receive gas (e.g., air) from outside of the insert device. For example, air may flow over a second end surface 301 of the insert device and into the internal volumes of the insert device. The second end surface faces the combustion chamber and is opposite a first end surface 112 (that generally faces away from the combustion chamber and in the direction of the fuel injector). The air may be drawn into the first internal volume by the flow of fuel into and through the conduits of the insert device. The conduits can be shaped to mix the fuel and air within the conduits into a fuel-and-air mixture. For example, each of the conduits can have a reduced size (e.g., inner diameter) relative to the internal volume of the insert device. This reduced size can help mix the fuel and air into the fuel-and-air mixture at a desired or designated fuel-to-air ratio. Changing the length of the conduits, the inner diameter of the conduits, or the like, can change this ratio.

Optionally, one or more of the conduits may receive gas (e.g., air) from outside the insert device, which then flows into the interior volume of the insert device, and then out of the insert device via one or more other conduits. There may be more conduits around the outer perimeter of the second mixing body than there are holes of the fuel injector (through which fuel is ejected). The conduits that are not aligned with the holes of the fuel injector may receive and direct air from outside the insert device into the interior volume of the insert device.

The conduits can be angled in a downward direction from the inner surfaces or interior volume of the insert device toward the outer surface of the insert device. This angled direction can direct the fuel-and-air (or fuel-air) mixture in the conduits into a combustion chamber 610 (shown in FIG. 7) of the engine cylinder 604 (shown in FIG. 7). Optionally, the conduits may not be angled downward (e.g., may be angled upward or horizontal).

As shown in FIG. 8, the first coupling body can have a tapered shape to control stresses between the insert device and the cylinder head. The first coupling body can be tapered in that the first coupling body is wider at the first end surface than at the interface between the first coupling body and the second mixing body, as shown in FIG. 7. An outer diameter 300 of the first coupling body can be different at different locations along the length of the first coupling body to provide this tapered shape. For example, the outer diameter may be largest at locations along the length of the first coupling body that are closer to the first end surface and may be shorter at locations along the length of the first coupling body that are farther from the first end surface and closer to the second mixing body. The tapered shape can cause the pressure created by the interference fit between the first coupling body and the cylinder head to be larger along the outer surface of the first coupling body (that engages or contacts the cylinder head) in locations that are closer to the first end surface and to be smaller in locations that are farther from the first end surface (and closer to the second mixing body). For example, during operation of the engine cylinder, the first coupling body may be heated to hotter temperatures in locations that are closer to the combustion chamber of the engine cylinder relative to locations that are farther from the combustion chamber. As a result, the first coupling body may thermally expand more, and the outer diameter of the first coupling body may increase more, at locations that are closer to the second mixing body than in locations that are farther from the second mixing body. While one or more embodiments shown and described herein involve the insert device being mounted to or with the cylinder head, not all embodiments are limited in this way. At least one embodiment of the insert devices can be mounted in a liner of an engine cylinder.

This tapered shape provides a transition from (a) a clearance fit between the first coupling body and the cylinder head at or closer to the interface between the first coupling body and the second mixing body to (b) the interference or transition fit between the first coupling body and the cylinder head at or closer to the first end surface of the first coupling body. Tapering the first coupling body can allow for this thermal expansion to occur without creating excessive pressure or stresses between the first coupling body and the cylinder head that would crack or otherwise damage the cylinder head or first coupling body. The tapered shape can allow for the first end of the first coupling body to maintain the interference fit or transition fit coupling between the insert device and the cylinder head without damaging the insert device and the cylinder head, while the second end of the first coupling body is able to expand without contacting the cylinder head (or, if contact is made, the created stress or pressure is reduced relative to the first coupling body not being tapered).

In the illustrated example, a sleeve 616 is arranged around the fuel injector with the distal tip of the fuel injector projecting out of a second end of the sleeve (as shown in FIG. 7). The sleeve can be formed of a ductile material, such as one or more metals or metal alloys. Alternatively, the sleeve can be formed from another type of material. The sleeve includes bent portions that form shoulders 617 that rest on steps 619 inside the cylinder head.

The sleeve can retain a working fluid (e.g., a coolant such as water or another medium that changes a temperature of the insert device, such as by cooling or heating the insert device) outside of the fuel injector and between the fuel injector and internal surfaces of the sleeve. The second end of the sleeve is disposed between the first coupling body of the insert device and the cylinder head. This second end of the sleeve can reduce thermal expansion stresses in the cylinder head caused by the differences in CTE between the insert device and the cylinder head. For example, the sleeve can be compressed to absorb expansion of the insert device.

As shown in FIG. 7, the second end of the sleeve includes external threads 614. These external threads outwardly protrude from the sleeve in directions oriented away from the center axis of the insert device. As shown in FIGS. 2, 3, and 7, the internal surface of the first coupling body of the insert device includes internal threads 118. Alternatively, the internal surface of the second mixing body of the insert device may include the internal threads. These internal threads inwardly protrude from the internal surface of the first coupling body in directions oriented toward the center axis of the insert device. The internal and external threads are shaped to mate with each other. The sleeve and insert device can be connected with each other and secured to each other by threading the insert device onto the sleeve and/or threading the sleeve into the insert device. The sleeve can support the fuel injector and retain the insert device in position relative to the fuel injector using this threaded connection.

With continued reference to the insert device shown in FIGS. 2 through 8, FIG. 9 illustrates a cross-sectional view of the insert device along line 8-8 shown in FIG. 4. The internal surface of the insert device may include a locating flat 116. The locating flat is a portion of the internal surface that is planar or more planar than one or more other portions (or the entire remainder of) the internal surface. The internal surface may form circular shapes or paths 801 along circumferences of the internal surface at various distances along the center axis of the insert device. The locating flat may be a planar surface formed by the internal surface that is not curved like the circular shapes or paths, as shown in FIG. 9.

The locating flat may be located at a position along the circumference of the internal surface that is based on locations of the conduits in the insert body. The fuel injector may include a complementary locating flat 800 in a position that is based on locations of the holes through which fuel is ejected from the fuel injector. The locating flats of the insert device and the fuel injector can mate with each other to align a rotational position of the first coupling body to a designated orientation within the cylinder head. This designated orientation can align the mixture conduits of the insert device with the holes of the fuel injector. For example, when the locating flat of the insert device mates with the locating flat of the fuel injector, the conduits of the insert device are aligned with the holes of the fuel injector. During installation of the insert device, the mating of the locating flats against each other can be detected or felt, thereby ensuring that the insert device is properly aligned with the fuel injector.

FIG. 10 illustrates a top perspective view of another example of an insert device 900. The insert device 900 may represent the insert device 100 shown in FIG. 1. FIG. 11 illustrates a bottom perspective view of the insert device shown in FIG. 10. FIG. 12 illustrates a side elevational view of the insert device shown in FIG. 10. FIG. 13 illustrates a top plan view of the insert device shown in FIG. 10. FIG. 14 illustrates a bottom plan view of the insert device shown in FIG. 10. FIG. 15 illustrates a cross-sectional view of one example of the insert device shown in FIG. 10 coupled with a cylinder head 1402 of an engine cylinder 1404.

The insert device 900 may be similar to the insert device 100. For example, the insert device 900 may include a first coupling body 902 having the end surface 112 and a second mixing body 908 having the conduits 110. The first coupling body and the second mixing body may extend around a center axis 904 and define a central internal volume 906. The first coupling body includes an internal surface 914 that can have the internal threads 118 described above. The insert device may be coupled with the cylinder head to receive and mix fuel and air before directing the fuel-and-air mixture into the combustion chamber of the engine cylinder, as described above.

One difference between the insert devices 100, 900 is the presence of external threads 918 along an outer surface of the first coupling body of the insert device 900. The external threads may outwardly protrude from the first coupling body in directions oriented away from the center axis. As shown in FIG. 15, the insert device is received into a receptacle 1400 of the cylinder head 1402. In contrast to the cylinder head 602 shown in FIG. 7, the cylinder head 1402 may include internal threads 1406 that inwardly project (e.g., toward the insert device and toward each other). The external threads of the insert device can mate with the internal threads of the cylinder head to secure the insert device to the cylinder head.

FIG. 16 illustrates a top perspective view of another example of an insert device 1500. The insert device 1500 can represent the insert device 100 shown in FIG. 1. FIG. 17 illustrates a bottom perspective view of the insert device shown in FIG. 16. FIG. 18 illustrates a side elevational view of the insert device shown in FIG. 16. FIG. 19 illustrates a top plan view of the insert device shown in FIG. 16. FIG. 20 illustrates a bottom plan view of the insert device shown in FIG. 16.

Similar to the insert device 100, the insert device shown in FIGS. 16 through 21 includes a tapered first coupling body 1502 that is shaped to be inserted into the receptacle of the cylinder head of the engine cylinder. The first coupling body extends around a center axis 1504 of the insert device. This center axis may extend along or parallel to the length of the fuel injector while the insert device is coupled with the cylinder head. The first coupling body extends around and defines a first interior volume 1506 of the insert device, similar to the first coupling body 102 and the first interior volume 106. This first interior volume is shaped to receive the distal tip of the fuel injector. As shown in FIG. 21, the first interior volume may be large enough to receive the distal tip of the fuel injector and the sleeve, similar to the insert device 100. Alternatively, the first interior volume may be larger such that one or more open volumes or gaps are disposed between any two or more of the first coupling body, the sleeve, and the fuel injector.

The insert device 1500 also includes a second mixing body 1508 that is coupled with the first coupling body. The second mixing body optionally can be referred to as a second directing body. The first and second bodies of the insert device can be different portions of a single, monolithic body, or may be separate parts that are formed separately but later joined together. The second mixing body extends around the center axis of the insert. The second mixing body has an outwardly extending flared shape or dovetail shape such that the second mixing body transitions from a smaller outer diameter of the first coupling body to a larger outer diameter of the second mixing body.

The second mixing body includes the conduits 110 described above and additional conduits 1510. In one embodiment, the conduits 1510 are gas conduits through which gas (e.g., a vapor) is received from outside the insert device. This gas flows through the air conduits into the interior volume of the insert device, entrains fuel ejected by the fuel injector, and exits the insert device through the conduits 110 (which can be referred to as mixture conduits) as a fuel-and-gas mixture. Like the mixture conduits, the gas conduits can extend from an interior or internal surface 1514 of the insert device to an outer or external surface 1508 of the insert device. The internal surface of the insert body may encircle or otherwise extend around and face the center axis of the insert device. The mixture conduits may be aligned with the holes of the fuel injector such that fuel ejected from the holes is directed into the mixture conduits in the second mixing body, as described above.

As shown in FIGS. 16 and 19, the insert device can include a locating flat 1516 that is similar or identical to the locating flat. As described above, this locating flat can interface or mate with the complementary locating flat of the fuel injector to align the mixture conduits of the insert device with the holes of the fuel injector.

The insert device can include internal pockets or cutouts 1518 that define internal chambers in the insert device. As shown in FIGS. 16 and 19, the pockets or cutouts can be voids that inwardly extend into the insert device from a first end surface 1512 of the insert device. Alternatively, the pockets or cutouts can be voids disposed within the interior of the body of the insert device such that no part of the voids is exposed or accessible from an external surface of the insert device. The first end surface can face upward in the direction of the fuel injector. The internal pockets or cutouts are voids in the first coupling body that can extend into the insert device from the first end surface toward, but not all the way to, the second mixing body. Alternatively, the internal pockets or cutouts can be voids in the first coupling body that extend into the insert device from the first end surface all the way to the second mixing body. In another embodiment, the internal pockets or cutouts can be voids in the first coupling body that are between the first end surface and the second mixing body, but that are not open along the first end surface (in contrast to the embodiment shown in FIGS. 16 and 19). The internal pockets or cutouts may have arcuate shapes that each extends around part, but not all, the center axis of the insert device. Alternatively, the internal pockets or cutouts may have circular shapes that entirely surround the center axis of the insert device.

The internal pockets or cutouts allow the first coupling body to flex inward and/or around internal pockets or cutouts. This can reduce thermal stress in the first coupling body as the first coupling body thermally expands. For example, the insert device may thermally expand more than the cylinder head. The increasing size of the insert device can be absorbed by flexing of the insert device inward into the voids created by the internal pockets or cutouts.

FIG. 21 illustrates another example of an insert device 2100. FIG. 22 illustrates a cross-sectional view of the insert device shown in FIG. 21 coupled with a cylinder head 2202. Similar to the other insert devices described herein, the insert device shown in FIGS. 21 and 22 includes a first coupling body 2102 configured to receive the distal tip of the fuel injector and a second mixing body 2104 having the mixture conduits 110 through which the fuel-and-air mixture is directed into the combustion chamber of the engine cylinder.

The insert device includes an alignment receptacle 2106 in which an alignment pin or key 2108 is disposed. Alternatively, the alignment pin or key may be additively formed with the insert device such that the insert device and the alignment pin or key are a single, monolithic body. The cylinder head can include a complementary alignment receptacle 2110. The alignment receptacles of the insert device and the cylinder head can receive opposite ends of the same elongated alignment pin or key to align a rotational position of the first coupling body to a designated orientation within the cylinder head. This designated orientation can align the mixture conduits of the insert device with the holes of the fuel injector.

For example, the receptacle in the insert device may be located at a position on the second mixing body that is based on locations of the conduits in the insert body. The receptacle in the cylinder head also can be at position that is based on locations of the holes of the fuel injector. The alignment pin or key can be received in both the receptacles (or may be received in the receptacle of the cylinder head) to align the conduits of the insert device with the holes of the fuel injector.

A method for forming one or more of the insert devices described herein can include depositing or printing a first layer of a material on a build surface. The method also can include sequentially depositing or printing one or more successive layers of the material on the first layer and/or on top of each other. This process can continue until formation of the insert device is complete.

In one example, an insert device is provided that includes a first coupling body shaped to be inserted into a receptacle of a cylinder head of an engine cylinder. The first coupling body extends around a center axis to define a first interior volume of the first coupling body that is shaped to receive a distal tip of a fuel injector. The insert device also includes a second mixing body coupled with the first coupling body and extending around the center axis. The second mixing body includes conduits configured to receive fuel output by the fuel injector and air from the combustion chamber, combine the fuel with the air into a fuel-air mixture, and direct the fuel-air mixture into the combustion chamber of the engine cylinder. The first coupling body has a first end surface positioned to face the cylinder head and the first coupling body is tapered such that an outer diameter of the first coupling body is larger toward the first end surface than toward the second mixing body.

Optionally, the first coupling body is shaped to provide an interference fit between the first coupling body and the cylinder head. The first coupling body can be shaped to provide the interference fit with a lower interference pressure between the first coupling body and the cylinder head in locations closer or nearer the combustion chamber than in other locations closed or nearer the first end surface. The first coupling body and the second directing body can be different portions of a single body having no seams or interfaces between the first coupling body and the second directing body. The first coupling body can include one or more internal chambers. The first coupling body can be configured to flex around the one or more internal chambers and reduce thermal stress in the first coupling body as the first coupling body thermally expands.

The first coupling body and/or the second mixing body can include an internal surface that extends around the center axis. The internal surface can include a locating flat positioned to mate with a corresponding flat surface of the fuel injector. The locating flat can be positioned relative to the conduits in the second directing body such that the conduits are aligned with fuel spray holes of the fuel injector while the locating flat is mated with the flat surface of the fuel injector. The first coupling body and/or the second mixing body can include an internal threaded surface shaped to mate with an outer threaded surface of a sleeve in which the fuel injector is disposed. The first coupling body can include an external threaded surface shaped to mate with an internal threaded surface of the cylinder head.

In another example, an insert device is provided that includes a first body shaped to mate with a cylinder head receptacle. The first body is shaped to receive a tip of a fuel injector from which fuel is ejected. The insert device also includes a second body integrally formed with the first body. The second body can include conduits configured to receive the fuel ejected by the fuel injector, mix the fuel with air into a fuel-air mixture, and direct the fuel-air mixture into an engine cylinder combustion chamber. The first body can include one or more internal chambers that permit the first body to flex and reduce thermal stress in the first body as the first body thermally expands.

Optionally, the first body has a tapered shape such that an outer diameter of the first body is larger in locations that are farther from the second body than in first locations closer to the second body. The tapered shape of the first body can provide an interference fit between the first body and an engine cylinder head with a lower interference pressure between the first body and the engine cylinder head in the locations that are farther from the second body than in the locations that are closer to the second body. The first body and the second body can be different portions of a single additively manufactured body having no seams or interfaces between the first body and the second body.

In another example, another insert device is provided. The insert device includes a first body shaped to be inserted into a receptacle of a cylinder head of an engine cylinder and a second body coupled with the first body and including conduits configured to receive fuel output by a fuel injector, mix the fuel with air drawn into the second body into a fuel-air mixture, and direct the fuel-air mixture into a combustion chamber of the engine cylinder. The first body and/or the second body includes an interior flat surface positioned to mate with a corresponding flat portion of the fuel injector to align output of fuel from the fuel injector with the conduits in the second body.

Optionally, the first body can have a tapered shape with a larger outer diameter in first locations that are farther from the second body than a smaller outer diameter in locations that are closer to the second body. The first body and the second body can be different portions of a single additively manufactured body having no seams or interfaces between the first body and the second body. The first body can include one or more internal cutouts or pockets that allow the first body to flex and reduce thermal stress in the first body as the first body thermally expands. The first body and/or the second body can include an internal threaded surface shaped to mate with an outer threaded surface of a sleeve in which the fuel injector is disposed. The first body can include an external threaded surface shaped to mate with an internal threaded surface of the cylinder head.

FIG. 23 illustrates a cross-section of an insert device 2300. The insert device shown in FIG. 23 may represent one or more examples of the insert devices shown in FIGS. 1 through 22. The plane of the cross-section of the insert device may extend along a center axis 2304 of the insert device. For example, the center axis of the insert device may lie in the same plane along which the cross-section is shown or taken in FIG. 23. The insert device may include the first (or upper) coupling body and the second (or lower or mixing) body described herein.

One or more of the previously described insert devices may have the interior volume that is larger than the distal tip of the fuel injector. For example, there may be a space or air gap between the distal tip of the fuel injector (or the fuel injector body) and the interior or internal surface of the coupling and mixing body (or bodies) such that the fuel ejected from the fuel spray holes passes over or through an air gap or spatial gap before entering the mixture, or fuel-and-gas, conduits.

In contrast, the insert device shown in FIG. 23 may have a smaller interior volume compared to other insert devices such that the fuel injector or distal tip of the fuel injector contacts, abuts, or otherwise engages an interior or internal surface 2314 of the insert device. For example, the interior volume of the insert device may be completely full but for a space or recess having a shape that is complementary or partially complementary to the shape of the distal tip of the fuel injector. Stated differently, the bodies of the insert device may continuously extend (but for conduits carrying gas or a combination of gas and fuel) from an external or exterior surface 2308 of the body/bodies of the insert device to the internal surface of the body/bodies of the insert device that engages, abuts, or otherwise directly contacts or touches the distal tip of the fuel injector from which fuel is ejected by the fuel injector. This can help with alignment of the insert device relative to the fuel injector. For example, instead of having to try and align fuel-and-gas mixture conduits of other insert devices with the spray holes 612 of the fuel injector across a spatial gap or separation, the insert device shown in FIG. 23 may be easier to align as inlets 2320 of fuel-and-gas mixture conduits 2310 may be closer to the spray holes of the fuel injector (than the other insert devices). This can reduce error in aligning the insert devices with the fuel injectors.

The insert device may include conduits 2310, 2312 that include gas conduits 2312 and the mixture (or fuel-and-gas mixture conduits) 2310. Each of these conduits can continuously extend from the exterior surface of the body/bodies of the insert device to the interior surface of the body/bodies of the insert device. For example, each conduit can define a tube, tunnel, pathway, or the like, that passes through the body of the insert device without interruption between the interior surface to the exterior surface.

In the illustrated example, the mixture conduits can upwardly extend through the body or bodies of the insert device. For example, outlets 2318 of the mixture conduits may be disposed along the exterior surface of the insert device in locations that are lower, or closer to the lower or second end surface of the insert device that faces the combustion chamber of the cylinder, while inlets 2320 of the mixture conduits may be disposed along the interior surface of the insert device in locations that are farther from the lower or second end surface of the insert device than the outlets 2318. Alternatively, the mixture conduits may be oriented in an upward direction (with the inlets located lower or closer to the second end surface than the outlets) or in a horizontal direction (e.g., with the inlets and outlets spaced equidistant from a plane that intersects the lower edges of the bottom end surface and that is perpendicular to the center axis 2304 of the insert device).

The inlets of the mixture conduits can be positioned in the body or bodies of the insert device so that the inlets, mixture conduits, and the outlets are aligned with directions 2322 in which fuel is directed out of the distal tip of the fuel injector. For example, the fuel spray holes, the inlets, the mixture conduits, and the outlets may all be aligned or substantially aligned with (e.g., coaxial with) or along the same straight line (e.g., which can be represented by the respective directions 2322). Optionally, the mixture conduits (of this example or other examples of the insert devices) may have a non-linear shape (e.g., simple curve, helical shape, etc.), a combination of multiple linear segments, a combination of multiple non-linear segments, or a combination of one or more linear segments and one or more non-linear segments. For example, the mixture conduits may have a curve, follow a helical path, etc., to impart or create a spin or rotational movement of the gas-and-fuel mixture.

The conduits may include inlets 2324 along the exterior surface of the body or bodies of the insert device and outlets 2326 that intersect the mixture conduits. For example, the gas conduits may intersect the mixture conduits such that the gas conduits lead into the mixture conduits from outside of the insert device. In operation, the fuel injector ejects fuel into the mixture conduits via the inlets of the mixture conduits. This fuel moves along the length of the mixture conduits toward the outlets of the mixture conduits. This movement of the fuel may draw or pull gas into the gas conduits from outside of the insert device. For example, the fuel movement in the mixture conduits may draw or pull gas (e.g., air, exhaust, other gas, gaseous fuel, etc.) from outside of the insert device, into the gas conduits via the inlets of the gas conduits, through the gas conduits, and into the mixture conduits via the outlets of the gas conduits. As the gas moves through the gas conduits and then the mixture conduits, the gas may be entrained by the fuel and form a combination or mixture of gas and fuel (e.g., the fuel-and-gas mixture). This combination or mixture can flow through and out of the mixture conduits into the combustion chamber of the engine cylinder via the outlets, similar or identical to as described above in connection with other examples.

In the illustrated example, each mixture conduit has multiple gas conduits that intersect the mixture conduit. For each mixture conduit, one gas conduit may intersect the mixture conduit in a location closer to the first or upper end surface of the insert device than the other gas conduit that intersects the same mixture conduit in a location closer to the second or lower end surface of the insert device. This provides one gas conduit above the mixture conduit (e.g., an upper gas conduit disposed between the mixture conduit and the first or upper surface of the insert device) and another gas conduit below the mixture conduit (e.g., a lower gas conduit disposed between the mixture conduit and the second or lower surface of the inset device). Alternatively, one or more of the mixture conduits may have only a single gas conduit intersecting the mixture conduit. This single gas conduit may be the upper gas conduit or the lower gas conduit. Optionally, the insert device may include multiple upper gas conduits above the mixture conduit (with no lower gas conduits), multiple lower gas conduits below the mixture conduit (with no upper gas conduits), or multiple upper gas conduits above the mixture conduit and multiple lower gas conduits below the mixture conduit.

The gas conduits may intersect the mixture conduit in locations that oppose each other. For example, the intersection of the upper gas conduit and the mixture conduit may be across from the intersection of the lower gas conduit and the mixture conduit. These intersections may oppose each other in that a straight line extending from (a) the middle or center of the intersection of the lower gas conduit and the mixture conduit to (b) the middle or center of the intersection of the upper gas conduit and the mixture conduit may be perpendicular to the directions in which fuel is directed along the mixture conduit (or the center line of the mixture conduit). Optionally, the intersections between the gas conduits and a mixture conduit may be staggered. For example, the intersection between the upper gas conduit and the mixture conduit may not oppose or be directly across from the intersection of the lower gas conduit and the same mixture conduit.

The conduits may intersect each other in locations that are closer to the spray holes of the fuel injector than other locations. For example, these intersections may be closer to the interior surface than the exterior surface, may be closer to the interior surface than a location that is midway between the interior surface and the exterior surface of the insert device (along a direction that is perpendicular to the center axis of the insert device), or the like. This can help the fuel entrain the gas in the mixture conduits to improve mixing or entrainment of the fuel and gas (when compared with other locations of the intersections that are farther from the interior surface or that are close to the exterior surface). In one embodiment, the gas conduits, 2324, may intersect the mixture conduit and the mixture conduit inlet, 2320.

The locations, number, and/or size (e.g., diameters or inner diameters) of the mixture conduits, the upper gas conduits, and/or the lower gas conduits may be selected in the design and fabrication of the insert device to ensure that the insert device outputs the fuel-and-gas mixture at a defined, designated, or desired fuel-to-gas (or gas-to-fuel) ratio. For example, the engine cylinder may produce work or power (e.g., torque) based on the fuel and air in the combustion chamber of the engine cylinder. Smaller and/or fewer gas conduits in one insert device may cause too much fuel and/or too little gas to be directed into the mixture conduit, while larger and/or more gas conduits in another insert device may cause too little fuel and/or too much gas to be directed into the mixture conduit. Smaller and/or fewer mixture conduits in one insert device may cause too little fuel-and-gas mixture to be directed into the mixture conduit, while larger and/or more mixture conduits in another insert device may cause too little much fuel-and-gas mixture to be directed into the mixture conduit. For example, in fabricating the insert device, if more gas conduits are selected for fabrication, then these gas conduits may be smaller in diameter than other insert devices that are fabricated with fewer gas conduits. In one example, several of the insert devices may be fabricated or created as part of a kit, set, or group, and one insert device may have more gas conduits with smaller diameters than another insert device having fewer gas conduits with larger diameters.

The gas conduits and the mixture conduits are shown as being disposed in a common (e.g., same) two dimensional plane. Alternatively, one or more of the gas conduits and/or the mixture conduits may be angled or curved so that the gas conduit(s) and/or the mixture conduit(s) is not within the same plane as others of the gas conduit(s) and/or mixture conduit(s).

The gas conduits and the mixture conduits are shown as being disposed in a vertical plane. Alternatively, one or more of the gas conduits and/or the mixture conduits may be oriented so that the gas conduit(s) intersect the mixture conduit from one or more sides rather than from the top or bottom.

In one embodiment, the different bodies described in connection with different embodiments or Figures may be combined with each other. For example, the first body of one Figure can be combined with one or more of the second bodies of another Figure to form an insert device. Optionally, the relative positions of the first and second bodies may be switched. For example, the second body may be in the position of the first body. Additionally, the first body of one embodiment can be combined with the second body of another embodiment and the positions of the first body and the second body switched with each other.

While one or more examples of the insert devices may be separate from the fuel injectors, cylinder heads, sleeves, etc., one or more other examples may combine the insert device with the fuel injector, cylinder head, or sleeve. For example, the insert device and fuel injector may be a single body with the insert device being inseparable from the distal tip of the fuel injector. As another example, the insert device and cylinder head may be a single body with the insert device being inseparable from the cylinder head.

The interior surface of the body may be sized to directly engage the distal tip of the fuel injector. The body may extend along the center axis from a first end surface that faces away from the combustion chamber of the engine cylinder to an opposite second end surface that faces the combustion chamber of the engine cylinder. The body may include one or more of the gas conduits between the first end surface and the mixture conduits. The body may include one or more of the gas conduits between the second end surface and the mixture conduits. The body may include at least one of the gas conduits between the first end surface and the mixture conduits and at least one of the gas conduits between the second end surface and the mixture conduits. The body may include the mixture conduits angled downward from the inlets of the mixture conduits to the outlets of the mixture conduits such that the outlets of the mixture conduits are closer to the second end surface than the inlets of the mixture conduits.

The body can include the mixture conduits in locations that are aligned with directions in which fuel spray holes of the distal tip of the fuel injector direct the fuel out of the fuel injector.

The interior surface of the body may be sized to directly engage a distal tip of the fuel injector. The body may extend along the center axis from a first end surface that faces away from the combustion chamber of the engine cylinder to an opposite second end surface that faces the combustion chamber of the engine cylinder. The body may include one or more of the gas conduits between the first end surface and the mixture conduits.

The body may include one or more of the gas conduits between the second end surface and the mixture conduits. The body may include at least one of the gas conduits between the first end surface and the mixture conduits and at least one of the gas conduits between the second end surface and the mixture conduits.

The body may include the mixture conduits angled downward from the inlets of the mixture conduits to the outlets of the mixture conduits such that the outlets of the mixture conduits are closer to the second end surface than the inlets of the mixture conduits. The body can include the mixture conduits in locations that are aligned with directions in which fuel spray holes in a distal tip of the fuel injector direct the fuel out of the fuel injector.

The body may include the mixture conduits in locations that are aligned with directions in which fuel spray holes of the distal tip of the fuel injector direct the fuel out of the fuel injector. The interior surface of the body can be sized to directly engage the distal tip of the fuel injector. The insert device also may include a sleeve that can be disposed between the body and the fuel injector. The sleeve may hold a working fluid to cool the body.

The singular forms “a”, “an”, and “the” include plural references unless the context clearly dictates otherwise. “Optional” or “optionally” means that the subsequently described event or circumstance may or may not occur, and that the description may include instances where the event occurs and instances where it does not. Approximating language, as used herein throughout the specification and claims, may be applied to modify any quantitative representation that could permissibly vary without resulting in a change in the basic function to which it may be related. Accordingly, a value modified by a term or terms, such as “about,” “substantially,” and “approximately,” may be not to be limited to the precise value specified. In at least some instances, the approximating language may correspond to the precision of an instrument for measuring the value. Here and throughout the specification and claims, range limitations may be combined and/or interchanged, such ranges may be identified and include all the sub-ranges contained therein unless context or language indicates otherwise.

This written description uses examples to disclose the embodiments, including the best mode, and to enable a person of ordinary skill in the art to practice the embodiments, including making and using any devices or systems and performing any incorporated methods. The claims define the patentable scope of the disclosure, and include other examples that occur to those of ordinary skill in the art. Such other examples are intended to be within the scope of the claims if they have structural elements that do not differ from the literal language of the claims, or if they include equivalent structural elements with insubstantial differences from the literal language of the claims.

	Number	Date	Country
Parent	17369561	Jul 2021	US
Child	18122409		US

INSERT DEVICE FOR FUEL INJECTION

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