This disclosure relates generally to the field of engine cranks, and, in particular, to engine cranks with air channels.
Efficiency in converting fuel chemical energy to useful mechanical energy is very important in an engine crank. Gasoline-powered internal combustion engines are used in many two cylinder engines. Internal combustion engines of various types and sizes propel vehicles along the roadways. An engine crank design that improves the efficiency of fuel chemical energy conversion may be desirable in economizing fuel consumption and/or engine performance.
The following presents a simplified summary of one or more aspects of the present disclosure, in order to provide a basic understanding of such aspects. This summary is not an extensive overview of all contemplated features of the disclosure, and is intended neither to identify key or critical elements of all aspects of the disclosure nor to delineate the scope of any or all aspects of the disclosure. Its sole purpose is to present some concepts of one or more aspects of the disclosure in a simplified form as a prelude to the more detailed description that is presented later.
In one aspect, the disclosure provides an engine crank with air channels. Accordingly, an engine crank including: a first web, wherein the first web includes a first plurality of air channels, and a second web coupled to the first web, wherein the second web includes a second plurality of air channels. In one example, each of the first plurality of air channels is equidistant from one another, and wherein each of the second plurality of air channels is equidistant from one another. In one example, each of the first plurality of air channels includes a first length and a first uniform cross-sectional area throughout the first length. In one example, each of the second plurality of air channels includes a second length and a second uniform cross-sectional area throughout the second length.
In one example, each of the first plurality of air channels includes a first length and a first non-uniform cross-sectional area throughout the first length. In one example, each of the second plurality of air channels includes a second length and a second non-uniform cross-sectional area throughout the second length. In one example, the first non-uniform cross-sectional area is largest near an outer perimeter of the engine crank and smallest near a crank axis. In one example, the second non-uniform cross-sectional area is largest near an outer perimeter of the engine crank and smallest near a crank axis.
In one example, each of the first plurality of air channels includes a cross-sectional area of one of the following: a square, a rectangle, a circle or an oval. In one example, each of the second plurality of air channels includes a cross-sectional area of one of the following: a square, a rectangle, a circle or an oval.
In another aspect, a two-stroke engine, including: a piston; a combustion chamber configured to house the piston; an engine crank, wherein the engine crank is coupled to the piston; and an engine crank chamber configured to house the engine crank; and wherein the engine crank comprises: a first web, wherein the first web includes a first plurality of air channels, and a second web coupled to the first web, wherein the second web includes a second plurality of air channels.
In one example, each of the first plurality of air channels is equidistant from one another, and wherein each of the second plurality of air channels is equidistant from one another. In one example, each of the first plurality of air channels includes a first length and a first uniform cross-sectional area throughout the first length. In one example, each of the second plurality of air channels includes a second length and a second uniform cross-sectional area throughout the second length.
In one example, each of the first plurality of air channels includes a first length and a first non-uniform cross-sectional area throughout the first length. In one example, each of the second plurality of air channels includes a second length and a second non-uniform cross-sectional area throughout the second length. In one example, the first non-uniform cross-sectional area is largest near an outer perimeter of the engine crank and smallest near a crank axis. In one example, the second non-uniform cross-sectional area is largest near an outer perimeter of the engine crank and smallest near a crank axis. In one example, each of the first plurality of air channels includes a cross-sectional area of one of the following: a square, a rectangle, a circle or an oval. In one example, each of the second plurality of air channels includes a cross-sectional area of one of the following: a square, a rectangle, a circle or an oval.
These and other aspects of the present disclosure will become more fully understood upon a review of the detailed description, which follows. Other aspects, features, and implementations of the present disclosure will become apparent to those of ordinary skill in the art, upon reviewing the following description of specific, exemplary implementations of the present invention in conjunction with the accompanying figures. While features of the present invention may be discussed relative to certain implementations and figures below, all implementations of the present invention can include one or more of the advantageous features discussed herein. In other words, while one or more implementations may be discussed as having certain advantageous features, one or more of such features may also be used in accordance with the various implementations of the invention discussed herein. In similar fashion, while exemplary implementations may be discussed below as device, system, or method implementations it should be understood that such exemplary implementations can be implemented in various devices, systems, and methods.
The detailed description set forth below in connection with the appended drawings is intended as a description of various configurations and is not intended to represent the only configurations in which the concepts described herein may be practiced. The detailed description includes specific details for the purpose of providing a thorough understanding of various concepts. However, it will be apparent to those skilled in the art that these concepts may be practiced without these specific details. In some instances, well known structures and components are shown in block diagram form in order to avoid obscuring such concepts.
While for purposes of simplicity of explanation, the methodologies are shown and described as a series of acts, it is to be understood and appreciated that the methodologies are not limited by the order of acts, as some acts may, in accordance with one or more aspects, occur in different orders and/or concurrently with other acts from that shown and described herein. For example, those skilled in the art will understand and appreciate that a methodology could alternatively be represented as a series of interrelated states or events, such as in a state diagram. Moreover, not all illustrated acts may be required to implement a methodology in accordance with one or more aspects.
There are four-stroke engines and two-stroke engines. The number of strokes per cycle is related to the piston movements per cycle. Many motorcycles and other small equipment operate with two-stroke engines. The two-stroke engine may include two steps in a cycle: a compression stroke and a power stroke. The two-stroke engine is a heat engine which relies on periodic combustion of the gasoline (i.e., fuel) and air mixture in an enclosed space within the two-stroke engine to convert chemical energy in the fuel to linear motion (i.e., mechanical energy).
For example, in a cycle, linear motion of a piston within a cylinder of the two-stroke engine is translated into rotational motion of the engine crank. In one example, one cycle represents one complete revolution of 360 degrees of the engine crank by the piston. In one example, during the compression stroke, the cylinder pressure increases as the volume of the fuel/air mixture is compressed. As the piston moves upwards, the fuel/air mixture is ignited by a spark plug to induce combustion. In one example, during the power stroke, the cylinder pressure decreases after combustion, and the piston moves downwards.
In one example, chemical energy is converted to mechanical energy as a result of the combustion. This is achieved, for example, through the piston movement during the compression stroke (i.e., one upward movement) and the power stroke (i.e., one downward movement), the engine crank rotates one revolution per cycle.
In one example, the fuel/air mixture enters the engine through an intake port and exhaust gases from the combustion exit through an exhaust port. In one example, the intake port and the exhaust port are on opposite sides of the engine. In one aspect, the engine crank may include additional air channels for movement of air throughout the cylinder.
In one example, air/fuel mixture 171 is introduced into the engine crank 130 via a reed valve 170. For example, flow of the air/fuel mixture 171 may be regulated by a carburetor (not shown) or a fuel injector (not shown) prior to introducing the air/fuel mixture 171 via the reed valve 170. For example, the air/fuel mixture 171 may utilize gasoline as a fuel for a gasoline-powered engine. For example, the engine crank 130 may include a crank axis 132 and a crank pin 138. In one example, the crank pin 138 is the termination of the connecting rod 120. The crank axis 132 is an axis of rotation for the engine crank 130. In one example, the crank axis 132 protrudes from the center of the engine crank 130.
The arrow 135 in
In one example, the engine 100 converts stored fuel chemical energy to mechanical energy in a two-stroke process using the piston 110, the connecting rod 120 and the engine crank 130. Performance of the engine may be quantified by performance metrics such as tractive force and power. In one example, tractive force (i.e., lateral force) may be expressed in kilograms (kg), newtons (N) or pounds (lb). In one example, power (i.e., time derivative of work) may be measured in horsepower (hp), watts (W) or joules per sec (J/s).
In one aspect, engine performance may be improved by modification of the engine crank 130 within the engine 100.
Arrow 399 indicates the rotational direction of the engine crank 330. In one example, the air channel 333 has a cross-sectional area of a square, a rectangle, a circle or an oval. In one example, the cross-sectional area is uniform throughout the length of the air channel. In one example the air channels 333 are spaced radially equidistant from one another. In the alternative, the air channels 333 are not spaced radially equidistant from one another. In one example, the air channel 333 extends from near the crank axis 332 to the crank wall 336. In another example, one end of the air channel 333 does not extend all the way to the crank axis 332 while the other end of the air channel 333 extends to the crank wall 336.
That is, the shortened air channel 433 does not extend all the way to the crank wall 336. In one example, one end of the shortened air channel 433 does not extend all the way to the crank axis 332; that is, the shortened air channel 433 does not extend the length of a radius measured from the crank axis 332 to the crank wall 336.
In one example, the engine crank 430 includes an X quantity of air channels 333 and a Y quantity of shortened air channels 433 such that the total quantity (i.e., X+Y) is the same as the total quantity of air channels 333 in the engine crank 330 of
In one example, the engine crank 430 includes an X quantity of air channels 333 that is larger than a Y quantity of shortened air channels 433. In another example, the engine crank 430 includes an X quantity of air channels 333 that is smaller than a Y quantity of shortened air channels 433. In yet another example, the engine crank 430 includes a Z quantity of air channels 333 and a Z quantity of shortened air channels 433 so that the quantity of air channels 333 and the quantity of shortened air channels 433 are the same.
In one example, the shortened air channel 433 has a cross-sectional area of a square, a rectangle, a circle or an oval. In one example, the cross-sectional area is uniform throughout the length of the air channel. In one example the air channels 333 and the shortened air channels 433 are spaced radially equidistant from one another. In the alternative, the air channels 333 and the shortened air channels 433 are not spaced radially equidistant from one another. Arrow 499 indicates the rotational direction of the engine crank 430.
Arrow 699 indicates the rotational direction of the engine crank 630. In one example, the non-uniform air channel 633 has a non-uniform cross-sectional area. For example, the cross-sectional area of the non-uniform air channel 633 is the largest near the outer perimeter of the engine crank 630 and smallest near the crank axis 632. In one example, the differential area of the cross-sectional area of the non-uniform air channel 633 varies in a continuous manner.
In one example, the air channel 633 extends from near the crank axis 632 to the crank wall 636. In another example, one end of the air channel 633 does not extend all the way to the crank axis 632 while the other end of the air channel 633 extends to the crank wall 636.
That is, the shortened non-uniform air channel 733 does not extend all the way to the crank wall 636. In one example, one end of the shortened non-uniform air channel 733 does not extend all the way to the crank axis 632; that is, the shortened non-uniform air channel 733 does not extend the length of a radius measured from the crank axis 632 to the crank wall 636.
In one example, the engine crank 730 includes an A quantity of non-uniform air channels 633 and a B quantity of shortened non-uniform air channels 733 such that the total quantity (i.e., A+B) is the same as the total quantity of non-uniform air channels 633 in the engine crank 630 of
In one example, the engine crank 730 includes an A quantity of non-uniform air channels 633 that is larger than a B quantity of shortened non-uniform air channels 733. In another example, the engine crank 730 includes an A quantity of non-uniform air channels 633 that is smaller than a B quantity of shortened non-uniform air channels 733. In yet another example, the engine crank 730 includes a C quantity of non-uniform air channels 633 and a C quantity of shortened non-uniform air channels 733 so that the quantity of non-uniform air channels 633 and the quantity of shortened non-uniform air channels 733 are the same.
In one example, the shortened non-uniform air channel 733 has a cross-sectional area of a square, a rectangle, a circle or an oval. In one example the non-uniform air channels 633 and the shortened non-uniform air channels 733 are spaced radially equidistant from one another. In the alternative, the non-uniform air channels 633 and the shortened non-uniform air channels 733 are not spaced radially equidistant from one another. Arrow 799 indicates the rotational direction of the engine crank 730. In one example, the shortened non-uniform air channel 733 has a non-uniform cross-sectional area. For example, the cross-sectional area of the shortened non-uniform air channel 633 is the largest near the outer perimeter of the engine crank 730 and smallest near the crank axis 632.
In one example, an engine crank may include a mixture of one or more air channels each with cross-sectional area that is uniform throughout its length, and one or more air channels each with cross-sectional area that is non-uniform throughout its length. For example, an engine crank may include a mixture of one or more of the following: air channels 333 (as shown in
In one example, an engine crank may include air channels with different cross-sectional areas. For example, an engine crank may include one or more air channels with one or more of the following cross-sectional areas: a square, a rectangle, a circle and/or an oval. One skilled in the art would understand that the quantities of the various air channels shown (e.g., air channels 333 (as shown in
KJ: The original graph in
KJ . . . please look at
The previous description is provided to enable any person skilled in the art to practice the various aspects described herein. Various modifications to these aspects will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other aspects. Thus, the claims are not intended to be limited to the aspects shown herein, but are to be accorded the full scope consistent with the language of the claims, wherein reference to an element in the singular is not intended to mean “one and only one” unless specifically so stated, but rather “one or more.” Unless specifically stated otherwise, the term “some” refers to one or more. A phrase referring to “at least one of” a list of items refers to any combination of those items, including single members. As an example, “at least one of: a, b, or c” is intended to cover: a; b; c; a and b; a and c; b and c; and a, b and c. All structural and functional equivalents to the elements of the various aspects described throughout this disclosure that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the claims. Moreover, nothing disclosed herein is intended to be dedicated to the public regardless of whether such disclosure is explicitly recited in the claims. No claim element is to be construed under the provisions of 35 U.S.C. § 112, sixth paragraph, unless the element is expressly recited using the phrase “means for” or, in the case of a method claim, the element is recited using the phrase “step for.”
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