The present invention relates to a component, in particular, a fuel distributor, for an injection system which is used for mixture-compressing, spark ignition internal combustion engines. Specifically, the present invention relates to the field of injection systems of motor vehicles, in which a direct injection of fuel into combustion chambers of an internal combustion engine takes place.
A fuel distributor including a pressure accumulator pipe is described in German Patent Application No. DE 10 2018 110 342 A1, the pressure accumulator pipe including a forged base body. Flange pieces are provided at the base body, which are formed in one piece of a single material at the base body by forging and provided with mounting openings.
A component according to the present invention, an injection system according to the present invention, and a method according to the present invention have the advantage that an improved design and functionality are made possible.
The measures disclosed herein allow advantageous refinements of the component, of the injection system, and of the method, of the present invention.
The injection system according to the present invention is used for mixture-compressing, spark ignition internal combustion engines. The injection system according to the present invention is used for injecting gasoline and/or ethanol and/or comparable fuels and/or for injecting a mixture including gasoline and/or ethanol and/or comparable fuels. The mixture may, for example, be a mixture including water. The component according to the present invention is used for such injection systems.
According to an example embodiment of the present invention, at least the base body of the component is formed of a material which is preferably a stainless steel, in particular, an austenitic stainless steel. In particular, the material may be based on an austenitic stainless steel having the material number 1.4301 or 1.4307 or on a stainless steel comparable thereto. Specifically, austenitic steels having the material numbers 1.4301, 1.4306, 1.4307, and 1.4404 may be used. Hydraulic terminals provided at the base body may each be designed as a high pressure input, a high pressure output, or another high pressure terminal. The base body is then preferably configured as a forging blank, together with a high pressure input, at least one high pressure output, which is implemented at the connecting piece, and possibly one or multiple other high pressure terminals during the manufacture, and is further processed.
The configuration of a fuel distributor according to the present invention thus results in considerable differences compared to a soldered rail, in which a pipe for the soldered rail is machined and deburred before the attachment components are soldered on. Due to the forged embodiment, in particular, a design for higher pressures may be made possible. A considerable difference compared to a high pressure rail for compression ignition internal combustion engines is the material selection and the processing, in particular the forging of a stainless steel.
According to an example embodiment of the present invention, as a result of the described post-processing of the connecting piece, which takes place after forging, advantageously a consistent lateral height at connecting pieces of multiple components may be implemented. Specifically, an advantageous refinement according to the present invention may be implemented in the process. In particular, a lateral height may be predefined in such a way that at least a minimum height required for the function of the limitation of the rotational degree of freedom is implemented. The predefined lateral height may then possibly be uniformly implemented at multiple connecting pieces of a component. Within the scope of a series manufacture, the predefined lateral height, which is at least as great as a minimum height, may then be uniformly predefined over a large number of components. After the forging operation, fluctuations of the component size and thus, in particular, deviations between the geometries of the connecting pieces result, by virtue of tolerances, at the individual connecting pieces as well as at connecting pieces of different components. The post-processing after the forging is preferably carried out in such a way that consistent configurations of the lateral surfaces of the recess of the connecting piece are implemented. By a function-appropriate deburring, a simplified machining may be made possible in the described embodiment, with a reduced start-up, correction and measuring effort.
Variations of the geometry of the individual connecting pieces may advantageously take place in the process with the aid of an edge removal of variable size. This is, in particular, possible in an advantageous refinement of the present invention. In the process, the post-processing may be based on a functional and tolerance analysis to ensure the required function, and to cover the fluctuations of the component size present due to tolerances.
The geometry and/or size of the resulting edge may then vary as a function of the deviation of the outer contour of the component. Since the design criterion for the processing is to ensure required functional surfaces at the lateral surfaces, deviations of the geometries of the connecting pieces at a fluid distributor or between multiple fluid distributors during a series manufacture result in differing geometries of the implemented edges. In this way, a refinement according to an example embodiment of the present invention thus advantageously takes place. It is particularly advantageous when the at least one lateral surface and the edge are implemented by a single tool in one process step, as is possible according to the advantageous refinement according to present invention. In a modified embodiment, the lateral surfaces and the edge, however, may also each be processed using individual tools.
Preferred exemplary embodiments of the present invention are described in greater detail in the following description with reference to the figures, in which corresponding elements are provided with concurrent reference numerals.
Fuel distributor 2 is used for storing and distributing the fluid among injectors 7 through 10 designed as fuel injectors 7 through 10 and reduces pressure fluctuations and pulsations. Fuel distributor 2 may also be used for damping pressure pulsations, which may occur when switching fuel injectors 7 through 10. In the process, during operation, high pressures p may occur at least temporarily in an interior space 11 of component 3.
Fuel distributor 2 includes a tubular base body 14, which is formed by a one-stage or multi-stage forging process. Component 3 includes a tubular base body 14, a high pressure input 15, and multiple hydraulic terminals 16 through 19, which are provided at the tubular base body and designed as high pressure outputs 16 through 19. Furthermore, a pressure sensor terminal 20 is provided at tubular base body 14. In this exemplary embodiment, tubular base body 14, high pressure input 15, connecting pieces 16A through 19A for high pressure outputs 16 through 19, and pressure sensor terminal 20 are formed of a forged individual part 14′. High pressure input 15, connecting pieces 16A through 19A for high pressure outputs 16 through 19, and pressure sensor terminal 20 are thus forged to base body 14.
Fuel injectors 7 through 10 are in each case connected to high pressure outputs 16 through 19 of fuel distributor 2. Furthermore, a pressure sensor 21 is provided, which is connected to pressure sensor terminal 20. At one end 22, tubular base body 14 is closed by a closure 23 designed as a screw plug 23 in this exemplary embodiment. In the process, end 22 of tubular base body 14 may be designed as a threaded connecting piece 22A. In one modified embodiment, an axial high pressure input may be provided at end 22 or at an end 24, instead of radial high pressure input 15.
After forging, tubular base body 14 or forged individual part 14′ is processed by at least a machining operation. In this exemplary embodiment, a borehole 25 is also formed in tubular base body 14 after forging to form interior space 11. Via interior space 11, the fluid supplied at high pressure input 15 may be distributed during operation among fuel injectors 7 through 10 connected to high pressure outputs 16 through 19.
Moreover, boreholes 26 through 31 are introduced into forged individual part 14′ by a machining operation. In the process, boreholes 27 through 30 serve as connecting boreholes 27 through for high pressure outputs 16 through 19. Borehole 26 is used for high pressure input 15. Borehole 31 is used for pressure sensor terminal 20. Furthermore, an internal thread 22B is cut into borehole 25 at end 22 of base body 14, so that threaded connecting piece 22A is formed.
Moreover, boreholes 32 through 37 may be provided at high pressure input 15, connecting pieces 16A through 19A of high pressure outputs 16 through 19, and pressure sensor terminal 20. In this exemplary embodiment, borehole 25 is axially oriented with respect to a longitudinal axis 38. Boreholes 32 through 37 are radially oriented with respect to longitudinal axis 38 in this exemplary embodiment. An outer side 39 of base body 14 may be based on a cylindrical jacket-shaped basic shape.
In the schematic representation of
The design of component 3 and the operating mode in the exemplary embodiment of the present invention are also further described hereafter with reference to
A first lateral surface 56 and a second lateral surface 57 are provided at recess 51. In the process, a contact occurs between nose 54 and first lateral surface 46 for restricting the rotational degree of freedom of injector 7 relative to component 3 in direction of rotation 49. Correspondingly, a contact occurs between nose 55 and second lateral surface 57 for restricting the rotational degree of freedom counter to direction of rotation 49. In the process, a predefined lateral height 58, which is schematically drawn in
The right side of
As is illustrated on the left side of
In this way, the consequence of the measure illustrated on the left side of
In one possible embodiment of the present invention, for example, the predefined lateral height 58 would be at least approximately equal to the minimum height for lateral surfaces 56, 57. As is illustrated on the left side in
In this way, the described post-processing may ensure the function of recess 51 at connecting piece 16A since lateral surfaces 56, 57 serving as lateral stop surfaces are always present in sufficient height. The processing of edge 53 or a deburring may then be defined in such a way, taking the fluctuations of the outer geometry of connecting piece 16A as well as the manufacturing tolerances into consideration, that the minimally required lateral height is present at all times. The resultant variable size, in particular, edge height 60, of the processed edge 53 has no influence on the function.
The post-processing of edge 53 may take place at a suitable tool angle. Edge 53 may also have a different edge geometry. For example, edge 53 may also be implemented as a rounded edge 53.
In the described embodiment, an inner edge line 70, which runs, amongst others, between first lateral surface 56 or second lateral surface 57 and edge 53, may then be continuously spaced apart from a base 71 of recess 51 corresponding to the certain lateral height 58.
In this way, connecting piece 16A is post-processed after forging in such a way that at least one lateral surface 56, 57 of recess 51 of connecting piece 16A, at which, in the mounted state, a contact is made possible between orienting element 50 of injector 7 and connecting piece 16A, is configured with a predefined lateral height 58. This applies correspondingly to other connecting pieces 16A through 19A.
The present invention is not restricted to the described exemplary embodiments.
Number | Date | Country | Kind |
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10 2020 208 759.8 | Jul 2020 | DE | national |
Filing Document | Filing Date | Country | Kind |
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PCT/EP2021/064030 | 5/26/2021 | WO |