阅读说明：本技术 一种气缸盖 (Cylinder cover ) 是由 李智 欧阳凤霞 高磊 陈功军 范建权 周迪 于 2020-06-24 设计创作，主要内容包括：本发明涉及一种气缸盖,用于密封多个气缸,其包括：本体,其具有一进气侧壁面及与所述进气侧壁面垂直的底面,所述底面对应第一气缸设有一个第一进气孔,对应第二气缸设有一个第二进气孔,所述第一进气孔与所述第二进气孔相邻设置；第一进气道,设于所述第一进气孔与所述第二进气孔之间,且所述第一进气道自所述进气侧壁面向所述本体内延伸形成两个第一进气分支,两个所述第一进气分支分别对应连通所述第一进气孔和所述第二进气孔,可以最大限度的增加所述第一进气道进气口的宽度,达到加大进气口面积的目的,提高所述第一进气道的流通能力。(The invention relates to a cylinder head for sealing a plurality of cylinders, comprising: the air conditioner comprises a body, a first air inlet, a second air inlet and a second air inlet, wherein the body is provided with an air inlet side wall surface and a bottom surface perpendicular to the air inlet side wall surface; first intake duct is located first inlet port with between the second inlet port, just first intake duct certainly the lateral wall face of admitting air extends to form two first branches of admitting air, two this internal extension first branch of admitting air corresponds the intercommunication respectively first inlet port with the second inlet port, increase that can furthest the width of first intake duct air inlet reaches the purpose that increases the air inlet area, improves the circulation ability of first intake duct.)

1. A cylinder head for sealing a plurality of cylinders, comprising:

the air cylinder comprises a body (1) and a cover, wherein the body is provided with an air inlet side wall surface (11) and a bottom surface (13) perpendicular to the air inlet side wall surface (11), the bottom surface (13) is provided with a first air inlet hole (41) corresponding to a first air cylinder (a), a second air inlet hole (42) corresponding to a second air cylinder (b), and the first air inlet hole (41) and the second air inlet hole (42) are arranged adjacently;

first intake duct (2), locate first inlet port (41) with between second inlet port (42), just first intake duct (2) certainly air inlet side wall face (11) to extend in body (1) and form two first branch (21), two first branch (21) of admitting air correspond the intercommunication respectively first inlet port (41) with second inlet port (42).

2. The cylinder head of claim 1, wherein:

the relative both sides of first intake duct (2) air inlet are equipped with respectively and are used for fixing first bolt hole (6) of body (1), first intake duct (2) with the position sharing pore wall that first bolt hole (6) contacted.

3. The cylinder head of claim 2, wherein:

the projection of the central axis of the first bolt hole (6) close to one side of the first cylinder (a) on the bottom surface (13) is positioned on the same vertical line with the projection of the central axis of the first cylinder (a) on the bottom surface (13);

the projection of the central axis of the first bolt hole (6) close to one side of the second cylinder (b) on the bottom surface (13) and the projection of the central axis of the second cylinder (b) on the bottom surface (13) are positioned on the same vertical line.

4. The cylinder head of claim 1, wherein:

a first common channel (22) is arranged on the first air inlet channel (2) close to the air inlet of the first air inlet channel, and the first common channel (22) extends towards the first air inlet hole (41) and the second air inlet hole (42) to form a first air inlet branch (21);

a regulating valve (10) is mounted in the first common passage (22), and the regulating valve (10) is used for regulating the air inlet flow of the two first air inlet branches (21).

5. The cylinder head of claim 1, wherein:

the bottom surface (13) is also provided with a third air inlet hole (43) corresponding to the second air cylinder (b), a fourth air inlet hole (44) corresponding to the third air cylinder (c), and the third air inlet hole (43) is adjacent to the fourth air inlet hole (44);

the cylinder head still is equipped with and is located third air inlet hole (43) with second intake duct (3) between fourth inlet port (44), second intake duct (3) certainly air inlet side wall face (11) to extend in body (1) and form two second branch (31) of admitting air, two second branch (31) of admitting air correspond the intercommunication respectively third inlet port (43) with fourth inlet port (44).

6. The cylinder head of claim 5, wherein:

the second air intake holes (42) are closer to the air intake side wall surface (11) than the third air intake holes (43);

the part of the second air inlet branch (31) close to the second air inlet hole (42) shares a hole wall with the second air inlet hole (42).

7. The cylinder head of claim 5, wherein:

and the connecting line of the second air inlet hole (42) and the center of the third air inlet hole (43) is obliquely arranged relative to the central line of the engine crankshaft.

8. The cylinder head of claim 1, wherein:

the free tail end of the first air inlet hole (41) is provided with a chamfer (45), and the axis of the chamfer (45) is positioned on one side of the axis of the first air inlet hole (41).

9. The cylinder head of claim 1, further comprising:

an exhaust side wall surface (12) provided on the body (1), the exhaust side wall surface (12) being disposed opposite to the intake side wall surface (11);

the bottom surface (13) is provided with a second exhaust hole (52) and a third exhaust hole (53) corresponding to the second cylinder (b);

first exhaust way (8), correspond second cylinder (b) sets up, just first exhaust way (8) certainly exhaust lateral wall face (12) to extend in body (1) and form two first exhaust branches (81), two first exhaust branch (81) correspond the intercommunication respectively second exhaust hole (52) with third exhaust hole (53).

10. The cylinder head of claim 1, further comprising:

an exhaust side wall surface (12) provided on the body (1), the exhaust side wall surface (12) being disposed opposite to the intake side wall surface (11);

the bottom surface (13) is provided with a first exhaust hole (51) corresponding to the first cylinder (a), a second exhaust hole (52) corresponding to the second cylinder (b), and the first exhaust hole (51) and the second exhaust hole (52) are arranged adjacently;

first exhaust way (8), locate first exhaust hole (51) with between second exhaust hole (52), just first exhaust way (8) certainly exhaust lateral wall face (12) to extend in body (1) and form two first exhaust branches (81), two first exhaust branch (81) correspond the intercommunication respectively first exhaust hole (51) with second exhaust hole (52).

Technical Field

The invention relates to the field of internal combustion engines, in particular to a cylinder cover.

Background

With the rapid development of the automobile industry, automobiles become one of indispensable vehicles for people to go out, an engine is the heart of the automobile, a combustion chamber is the core of the engine, and the engine is a place where fuel is ignited and combusted and does work to enable the engine to generate power; the cylinder head of the engine bears huge explosion pressure and extremely high combustion temperature as a part of a combustion chamber, the reasonable design of the cylinder head can improve the structural strength and the cooling effect of the cylinder head, and the design of an air inlet channel of the cylinder head has great influence on the performance of the engine.

Disclosure of Invention

The embodiment of the invention aims to provide a cylinder cover to solve the problem that the width of an inlet of an air inlet channel is limited by a structure in the prior art, so that the improvement of the circulation capacity of the air inlet channel is not facilitated.

To achieve the above object, an embodiment of the present invention provides a cylinder head for sealing a plurality of cylinders, including: the air conditioner comprises a body, a first air inlet, a second air inlet and a second air inlet, wherein the body is provided with an air inlet side wall surface and a bottom surface perpendicular to the air inlet side wall surface; the first air inlet channel is arranged between the first air inlet hole and the second air inlet hole, the first air inlet channel extends towards the inner side of the air inlet side wall to form two first air inlet branches, and the two first air inlet branches are respectively communicated with the first air inlet hole and the second air inlet hole.

In some embodiments, the two opposite sides of the first air inlet channel are respectively provided with a first bolt hole for fixing the body, and the first air inlet channel and the part of the first bolt hole in contact share a hole wall.

In some embodiments, a projection of a central axis of the first bolt hole on the bottom surface near one side of the first cylinder is located on the same vertical line as a projection of a central axis of the first cylinder on the bottom surface; the projection of the central axis of the first bolt hole close to one side of the second cylinder on the bottom surface is positioned on the same vertical line with the projection of the central axis of the second cylinder on the bottom surface.

In some embodiments, a first common channel is arranged at the position, close to the air inlet, of the first air inlet, and extends from the first common channel to the first air inlet hole and the second air inlet hole respectively to form the first air inlet branch; and a regulating valve is arranged in the first common channel and used for regulating the air inlet flow of the two first air inlet branches.

In some embodiments, the bottom surface is further provided with a third air inlet hole corresponding to the second air cylinder, and a fourth air inlet hole corresponding to the third air cylinder, and the third air inlet hole is arranged adjacent to the fourth air inlet hole; the cylinder head still is equipped with and is located third air inlet hole with the second intake duct between the fourth inlet port, the second intake duct certainly the lateral wall face that admits air extends in the body and forms two second branches that admit air, two the second branch of admitting air corresponds the intercommunication respectively the third inlet port with the fourth inlet port.

In some embodiments, the second air intake holes are offset closer to the air intake sidewall surface than the third air intake holes; the part of the second air inlet branch, which is close to the second air inlet hole, shares a hole wall with the second air inlet hole.

In some embodiments, a line connecting centers of the second intake port and the third intake port is disposed obliquely with respect to a center line of a crankshaft of the engine.

In some embodiments, the free end of the first air intake hole is provided with a chamfer, and the axis of the chamfer is positioned on one side of the axis of the first air intake hole.

In some embodiments, an exhaust sidewall surface provided on the body, the exhaust sidewall surface being disposed opposite the intake sidewall surface; the bottom surface is provided with a second exhaust hole and a third exhaust hole corresponding to the second cylinder; first exhaust way, correspond the second cylinder sets up, just first exhaust way certainly exhaust lateral wall towards this internal extension forms two first exhaust branches, two first exhaust branch corresponds the intercommunication respectively the second exhaust hole with the third exhaust hole.

In some embodiments, an exhaust sidewall surface provided on the body, the exhaust sidewall surface being disposed opposite the intake sidewall surface; the bottom surface is provided with a first exhaust hole corresponding to the first air cylinder, a second exhaust hole corresponding to the second air cylinder, and the first exhaust hole and the second exhaust hole are arranged adjacently; first exhaust way, locate first exhaust hole with between the second exhaust hole, just first exhaust way certainly exhaust the lateral wall towards this internal extension forms two first exhaust branches, two first exhaust branch corresponds the intercommunication respectively first exhaust hole with the second exhaust hole.

The technical scheme provided by the invention has the beneficial effects that:

the embodiment of the invention provides a cylinder cover, wherein the bottom surface is provided with one first air inlet hole corresponding to a first cylinder, the bottom surface is provided with one second air inlet hole corresponding to a second cylinder, the first air inlet hole and the second air inlet hole are arranged adjacently, and a first air inlet channel is arranged between the first air inlet hole and the second air inlet hole, so that the first air inlet channel can stretch from the first cylinder to the second cylinder.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an intake port of a cylinder head according to the prior art;

FIG. 2 is a schematic structural view of a cylinder head according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view A-A of FIG. 2;

fig. 4 is a schematic structural diagram of another cylinder head according to an embodiment of the present invention.

In the figure: 1. a body; 11. an air intake side wall surface; 12. an exhaust side wall surface; 13. a bottom surface; 2. a first air inlet channel; 21. a first intake branch; 22. a first common channel; 3. a second air inlet channel; 31. a second intake branch; 32. a second common channel; 4. an air inlet; 41. a first air intake hole; 42. a second air intake hole; 43. a third air inlet hole; 44. a fourth air intake hole; 45. chamfering; 5. an exhaust hole; 51. a first exhaust port; 52. a second vent hole; 53. a third vent hole; 54. a fourth vent hole; 6. a first bolt hole; 7. a second bolt hole; 8. a first exhaust duct; 81. a first exhaust branch; 9. a second exhaust passage; 91. a second exhaust branch; 10. adjusting a valve; a. a first cylinder; b. a second cylinder; c. and a third cylinder.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

The embodiment of the invention provides a cylinder cover, which can solve the problem that the inlet width of an air inlet channel is limited by a structure and is not beneficial to improving the circulation capacity of the air inlet channel in the related technology.

Referring to fig. 2, a cylinder head according to an embodiment of the present invention is provided for sealing a plurality of cylinders, the cylinder head including: the body 1 is covered above the plurality of cylinders; and a first air inlet channel 2 arranged on the body 1 and used for transmitting air flow to the cylinder.

Referring to fig. 2, in some embodiments, the body 1 may be a unitary cover disposed on a plurality of cylinder heads, and may have an air inlet side wall surface 11 and an air outlet side wall surface 12 disposed opposite to each other, and the body 1 may further have a bottom surface 13 disposed perpendicular to the air inlet side wall surface 11, and the bottom surface 13 is attached to a top surface of the cylinder to seal the cylinder; the plurality of cylinders may include a first cylinder a, a second cylinder b, and a third cylinder c, the bottom surface 13 may be provided with a plurality of intake ports 4 and a plurality of exhaust ports 5, wherein a first intake port 41 and a first exhaust port 51 may be provided corresponding to the first cylinder a, a second intake port 42 and a third intake port 43 may be provided corresponding to the second cylinder b, and a second exhaust port 52 and a third exhaust port 53 may be provided corresponding to the third cylinder c, and a fourth intake port 44 and a fourth exhaust port 54 may be provided corresponding to the third cylinder c; the first air inlet holes 41, the second air inlet holes 42, the third air inlet holes 43 and the fourth air inlet holes 44 are sequentially arranged according to the arrangement direction of the air cylinders, so that the first air inlet holes 41 and the second air inlet holes 42 are arranged in a cross-cylinder adjacent mode, and the third air inlet holes 43 and the fourth air inlet holes 44 are arranged in a cross-cylinder adjacent mode; the first exhaust hole 51, the second exhaust hole 52, the third exhaust hole 53 and the fourth exhaust hole 54 are sequentially arranged according to the arrangement direction of the cylinders, so that the first exhaust hole 51 and the second exhaust hole 52 are arranged across the cylinder and are adjacent to each other, and the third exhaust hole 53 and the fourth exhaust hole 54 are arranged across the cylinder and are adjacent to each other; it should be understood that in the present embodiment, the bottom surface 13 is provided with only two of the intake holes 4 corresponding to the second cylinder b, the two intake holes 4 are named as the second intake hole 42 and the third intake hole 43 for convenience of description, and only two of the exhaust holes 5 are provided corresponding to the second cylinder b, the two exhaust holes 5 are named as the second exhaust hole 52 and the third exhaust hole 53 for convenience of description; similarly, the bottom surface 13 is provided with only two intake holes 4 and two exhaust holes 5 corresponding to the first cylinder a, and this embodiment only describes one of the intake holes 4 and one of the exhaust holes 5, that is, the first intake hole 41 and the first exhaust hole 51, and the bottom surface 13 is provided with only two intake holes 4 and two exhaust holes 5 corresponding to the third cylinder c, and this embodiment only describes one of the intake holes 4 and one of the exhaust holes 5, that is, the fourth intake hole 44 and the fourth exhaust hole 54.

Referring to fig. 2 and 3, in some alternative embodiments, the second air inlet hole 42 may be closer to the air inlet side wall surface 11 than the third air inlet hole 43, such that a connecting line between the second air inlet hole 42 and the center of the third air inlet hole 43 is inclined with respect to a center line of a crankshaft of the engine, wherein the center line of the crankshaft of the engine is a horizontal line parallel to the air inlet side wall surface 11; the second exhaust hole 52 may be offset from the exhaust sidewall surface 12 with respect to the third exhaust hole 53 such that a line connecting the centers of the second exhaust hole 52 and the third exhaust hole 53 is inclined with respect to the center line of the engine crankshaft; the free end of the first air intake hole 41 (i.e. the position near the bottom 13 and communicated with the first cylinder a) may be provided with a chamfer 45, and the axis L1 of the chamfer 45 is located at one side of the axis L2 of the first air intake hole 41, i.e. the axis L1 of the chamfer 45 is not located on the same straight line with the axis L2 of the first air intake hole 41, in other embodiments, the axis L1 of the chamfer 45 of the first air intake hole 41 and the axis L2 of the first air intake hole 41 may also be located on the same straight line; similarly, the axis L1 of the chamfered portion 45 of the second intake port 42 and the axis L2 of the second intake port 42 may be aligned, or the axis L1 of the chamfered portion 45 of the third intake port 43 and the axis L2 of the third intake port 43 may be aligned, or the axis L1 of the chamfered portion 45 of the second intake port 42 and the axis L2 of the second intake port 42 may be aligned, and the axis L1 of the chamfered portion 45 of the third intake port 43 and the axis L2 of the third intake port 43 may be aligned, and the distance between the axis of the chamfered portion 45 of the second intake port 42 or the third intake port 43 and the axis of the corresponding intake port 4 may be adjusted, so that the swirl ratio can be adjusted steplessly without adjusting the cylinder head blank, and it will be understood that the first intake port 41, the second intake port 42, and the third intake port 43, The free ends of the third air intake hole 43 and the fourth air intake hole 44 may be provided with the chamfer 45.

Referring to fig. 2, in some alternative embodiments, the bottom surface 13 may be provided with first bolt holes 6 corresponding to the first cylinder a, the second cylinder b and the third cylinder c, respectively, in this embodiment, two first bolt holes 6 corresponding to the first cylinder a are provided, one of the first bolt holes 6 is located close to the intake side wall surface 11, the other of the first bolt holes 6 is located close to the exhaust side wall surface 12, and the first cylinder a is located between the two first bolt holes 6, the two first bolt holes 6 provided corresponding to the first cylinder a each have a first central axis, the first cylinder a has a cylinder central axis, and the projection of the two first central axes on the bottom surface 13 and the projection of the cylinder central axis on the bottom surface 13 are positioned on the same vertical line; similarly, the positional relationship between the two first bolt holes 6 provided corresponding to the second cylinder b and the second cylinder b is the same as that of the first cylinder a, and the positional relationship between the two first bolt holes 6 provided corresponding to the third cylinder c and the third cylinder c is the same as that of the first cylinder a; and the distances from the three first bolt holes 6 located near the intake side wall surface 11 to the intake side wall surface 11 are the same, and the distances from the three first bolt holes 6 located near the exhaust side wall surface 12 to the exhaust side wall surface 12 are the same.

Referring to fig. 2, in some embodiments, two second bolt holes 7 may be further disposed on the bottom surface 13 between the first cylinder a and the second cylinder b, wherein one of the second bolt holes 7 is located between the first intake hole 41 and the second intake hole 42 and close to the intake sidewall surface 11, and the other second bolt hole 7 is located between the first exhaust hole 51 and the second exhaust hole 52 and close to the exhaust sidewall surface 12; two second bolt holes 7 may be formed in the bottom surface 13 between the second cylinder b and the third cylinder c, wherein one of the second bolt holes 7 is located between the third intake hole 43 and the fourth intake hole 44 and close to the intake sidewall 11, and the other second bolt hole 7 is located between the third exhaust hole 53 and the fourth exhaust hole 54 and close to the exhaust sidewall 12.

Referring to fig. 2, in some alternative embodiments, the first air inlet channel 2 may be disposed between the first air inlet hole 41 and the second air inlet hole 42, such that the first air inlet channel 2 may be disposed between the first cylinder a and the second cylinder b, the first air inlet channel 2 may be formed by extending from the air inlet sidewall surface 11 to the inside of the body 1, and the first air inlet channel 2 may include a first common channel 22 at the air inlet of the first air inlet channel 2, and two first air inlet branches 21 extending from the first common channel 22 to the middle of the body 1, the two first air inlet branches 21 are disposed separately from each other, and one of the first air inlet branches 21 extends toward the first air inlet hole 41 and communicates with the first air inlet hole 41, and the other first air inlet branch 21 extends toward the second air inlet hole 42 and communicates with the second air inlet hole 42, the air flow entering the first air intake duct 2 can flow from the first common passage 22 to the first air intake hole 41 and the second air intake hole 42, respectively, and further into the first cylinder a and the second cylinder b.

Referring to fig. 2, in some embodiments, the adjusting valve 10 may be installed at a middle position of the first common passage 22, and the flow rates of the air flows respectively flowing into the two first air inlet branches 21 may be changed by adjusting the angle change of the adjusting valve 10, so as to achieve different swirl ratios under different working conditions, and since the adjusting valve 10 is installed in the first common passage 22 near the air inlet of the first air inlet 2, where the air flows do not yet enter the two first air inlet branches 21, the air flows respectively flowing into the two first air inlet branches 21 may be adjusted at the air inlet from the source, and the swirl ratio may be adjusted in a wider range by installing the adjusting valve 10 near the tail ends of the two first air inlet branches 21 than by installing the adjusting valve 10 near the air inlet of the first air inlet 2.

Referring to fig. 2, in some alternative embodiments, two first bolt holes 6 disposed corresponding to the first cylinder a and the second cylinder b and near the intake sidewall surface 11 may be respectively located at opposite sides of the first intake duct 2, and two first bolt holes 6 can be respectively contacted with the first air inlet channel 2, the parts of the first air inlet channel 2 contacted with the two first bolt holes 6 can share the hole wall, so that the maximum value of the width of the air inlet of the first air inlet channel 2 is equal to the radius value of two first bolt holes 6 subtracted by the center distance of the two first bolt holes 6 at the two sides of the first air inlet channel 2 and then the wall thickness of the two first bolt holes 6 is subtracted, therefore, the width of the air inlet of the first air inlet channel 2 can be designed to be wider, which is beneficial to a larger amount of air flow entering the first air inlet channel 2; the second bolt hole 7 located between the first intake hole 41 and the second intake hole 42 may also be located between the two first intake branches 21, two sides of the second bolt hole 7 may respectively contact the two first intake branches 21, and the parts of the second bolt hole 7 contacting the two first intake branches 21 may share a hole wall, so that the channels of the two first intake branches 21 may be designed to be wider, and the circulation of the atmospheric air is facilitated.

Referring to fig. 2, in some embodiments, the cylinder head may further include a second intake duct 3 located between the third intake hole 43 and the fourth intake hole 44, the second intake duct 3 is formed by extending from the intake sidewall surface 11 into the body 1, the second intake duct 3 may include a second common channel 32 located at an intake port of the second intake duct 3, and two second intake branches 31 extending from the second common channel 32 to a middle portion of the body 1, the two second intake branches 31 respectively and correspondingly communicate with the third intake hole 43 and the fourth intake hole 44, the second intake branch 31 communicated with the third intake hole 43 may contact with the second intake hole 42, and a portion of the second intake branch 31 contacting with the second intake hole 42 may share a hole wall, so that the width of the second intake hole 42 is larger, the rest of the structure of the second air inlet 3 is the same as that of the first air inlet 2, and is not described herein again; just first intake duct 2 with second intake duct 3 can be straight air flue, or be the tangential air flue, or be the spiral air flue, also can be the combination of different types of air flue.

Referring to fig. 2, in some alternative embodiments, the cylinder head may further include a first exhaust duct 8 extending from the exhaust sidewall surface 12 into the body 1, the first exhaust duct 8 is disposed corresponding to the second cylinder b, the first exhaust duct 8 extends toward the second cylinder b to form two separated first exhaust branches 81, the two first exhaust branches 81 respectively communicate with the second exhaust hole 52 and the third exhaust hole 53 for exhausting gas from the second cylinder b, and the cylinder head may also be disposed corresponding to the first cylinder a and the third cylinder c and respectively have one first exhaust duct 8 communicated with the first exhaust hole 51 and the fourth exhaust hole 54.

Referring to fig. 4, another cylinder head according to an embodiment of the present invention is different from the cylinder head in the above embodiment in that the first exhaust duct 8 is disposed between the first exhaust hole 51 and the second exhaust hole 52, that is, between the first cylinder a and the second cylinder b, and is not disposed corresponding to the second cylinder b, and two first exhaust branches 81 formed by extending the first exhaust duct 8 into the main body 1 respectively communicate with the first exhaust hole 51 and the second exhaust hole 52, and a structural width of the first exhaust duct 8 extending from the exhaust side wall 12 into the main body 1 may be the same as a structural width corresponding to the first intake duct 2, that is, the first exhaust duct 8 may be overlapped with the first intake duct 2 after rotating 180 °, so that a maximum value of a width of an exhaust port of the first exhaust duct 8 is equal to two first spiral threads on two sides of the first exhaust duct 8 The center distance of the bolt holes 6 is subtracted by the radius value of the two first bolt holes 6, and then the wall thickness of the two first bolt holes 6 is subtracted, so that the width of the exhaust port of the first exhaust passage 8 can be designed to be wider, and as the first exhaust passage 8 can span from the first cylinder a to the second cylinder b, the distance between the first cylinder a and the second cylinder b is larger, therefore, the width of the exhaust port of the first exhaust passage 8 can be increased to the maximum extent, the purpose of enlarging the area of the exhaust port is achieved, and the flow capacity of the first exhaust passage 8 is improved; similarly, a second exhaust duct 9 may be disposed between the third exhaust hole 53 and the fourth exhaust hole 54, the second exhaust duct 9 may also extend to form two second exhaust branches 91 respectively communicated with the third exhaust hole 53 and the fourth exhaust hole 54, and the structural design of the second exhaust duct 9 may be the same as that of the first exhaust duct 8, which is not described herein again.

The principle of the cylinder cover provided by the embodiment of the invention is as follows:

because bottom surface 13 corresponds first cylinder a is equipped with one first inlet port 41 corresponds second cylinder b is equipped with one second inlet port 42, first inlet port 41 with second inlet port 42 sets up adjacently, just first intake duct 2 is located first inlet port 41 with between the second inlet port 42, thereby first intake duct 2 can certainly first cylinder a spanes extremely second cylinder b, because first cylinder a with interval between the second cylinder b is great, consequently, can make full use of first cylinder a with space between the second cylinder b, furthest's increase the width of first intake duct 2 air inlet reaches the purpose that increases the air inlet area, improves the circulation ability of first intake duct 2.

In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.