Cylinder head cover and engine

Abstract

The utility model discloses a cylinder head cover, which comprises a cylinder head cover panel, the cylinder head cover side plate is arranged on the edge of the cylinder head cover panel; the cylinder head cover fastening plate is connected to the end, away from the cylinder head cover panel, of the cylinder head cover side plate, a wall thickness gradual change area is at least arranged on the path from the end, connected with the cylinder head cover fastening plate, of the cylinder head cover side plate to the middle area of the cylinder head cover panel, and a preset distance is formed between the thinnest position of the wall thickness gradual change area and the middle area of the cylinder head cover panel. The boundary of the wall thickness gradual change area can achieve the effect of gathering vibration elastic waves, vibration transmitted through a cylinder head cover bolt cannot continue to be spread forwards when reaching the thinnest area of the wall thickness gradual change area, the preset distance is formed between the thinnest area and the middle area of the cylinder head cover panel, and therefore the vibration can not be continuously spread forwards. Therefore, vibration energy in the middle of the cylinder head cover panel can be reduced, and vibration of parts installed at the position can be reduced. And the overall vibration energy of the cylinder head cover is reduced, so that the radiation noise of the cylinder head cover can be synchronously reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine, more specifically, relate to a cylinder cover and engine. BACKGROUND

[0002] The cylinder cover is an important part of the engine and is fixed above the cylinder head. The main functions of the cylinder cover include, but are not limited to, preventing foreign matter from entering the engine, and sealing. It can cover and seal the cylinder head, keep the oil inside, and isolate contaminants such as dirt and moisture from the outside.

[0003] The cylinder cover in the prior art includes a cylinder cover panel and a cylinder cover side plate connected to the edge of the cylinder cover panel. The side of the cylinder cover side plate away from the cylinder cover panel is connected to a cylinder cover fastening plate. The cylinder cover fastening plate has a fastener hole to allow the cylinder cover to be fixed to the cylinder head by a fastener.

[0004] Due to the large coverage area of the cylinder cover, the cylinder cover panel has a large area. Since the cylinder cover panel is only supported by the cylinder cover side plate at its edge, the middle part of the cylinder cover panel has low stiffness and large vibration. On the one hand, it will cause large radiation noise, and on the other hand, it will cause damage to components installed in the middle of the cylinder cover panel due to large vibration, such as oil supply pipes installed in the middle of the cylinder cover panel, which will loosen due to vibration, causing wear and oil leakage.

[0005] Therefore, how to reduce the vibration of the middle part of the cylinder cover panel to improve the reliability of components installed in that position is a problem that needs to be solved by those skilled in the art. SUMMARY

[0006] Therefore, the purpose of the utility model is to provide a cylinder cover to reduce the vibration of the middle part of the cylinder cover panel and improve the reliability of components installed in that position.

[0007] Another purpose of the utility model is to provide an engine with the above-mentioned cylinder cover.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions:

[0009] A cylinder cover, comprising:

[0010] a cylinder cover panel;

[0011] a cylinder cover side plate arranged at the edge of the cylinder cover panel;

[0012] A cylinder head cover fastening plate is connected to an end of the cylinder head cover side plate away from the cylinder head cover face plate, and has a wall thickness gradient zone in a path from the end of the cylinder head cover side plate connected to the cylinder head cover fastening plate to a middle region of the cylinder head cover face plate, and a thinnest position of the wall thickness gradient zone has a preset distance from the middle region of the cylinder head cover face plate.

[0013] Optionally, in the above-mentioned cylinder head cover, the wall thickness gradient zone at least includes a first wall thickness gradient zone arranged on the cylinder head cover side plate.

[0014] The wall thickness of the first wall thickness gradient zone gradually decreases from a first end to a second end, the first end of the wall thickness gradient zone is an end close to the cylinder head cover fastening plate, and the second end is an end close to the cylinder head cover face plate.

[0015] Optionally, in the above-mentioned cylinder head cover, the first end of the first wall thickness gradient zone is an end of the cylinder head cover side plate connected to the cylinder head cover fastening plate.

[0016] The second end of the first wall thickness gradient zone is an end of the cylinder head cover side plate connected to the cylinder head cover face plate.

[0017] Optionally, in the above-mentioned cylinder head cover, the wall thickness gradient zone further includes a second wall thickness gradient zone arranged on the cylinder head cover face plate.

[0018] The wall thickness of the second wall thickness gradient zone gradually decreases from a first end to a second end, the first end of the wall thickness gradient zone is an end away from the cylinder head cover side plate, and the second end is an end close to the cylinder head cover side plate.

[0019] Optionally, in the above-mentioned cylinder head cover, the second end of the second wall thickness gradient zone is an end of the cylinder head cover face plate connected to the cylinder head cover side plate.

[0020] Optionally, in the above-mentioned cylinder head cover, the cylinder head cover face plate has an equal wall thickness zone, the equal wall thickness zone is located in a middle region of the cylinder head cover face plate, and the second wall thickness gradient zone is located around the equal wall thickness zone.

[0021] Optionally, in the above-mentioned cylinder head cover, the thicknesses of the first wall thickness gradient zone and the second wall thickness gradient zone are according to a power function y = ex n +a 0 Gradually change;

[0022] e Be constant;

[0023] n Be greater than or equal to 2;

[0024] a0 is the minimum thickness, a 0 is not less than 1 / 3 of the base wall thickness of the cylinder head cover.

[0025] Optionally, in the above-mentioned cylinder head cover, further comprising a damping material piece, the damping material piece is arranged at least at one end of the first wall thickness gradually changing region and the second wall thickness gradually changing region with thinner thickness.

[0026] Optionally, in the above-mentioned cylinder head cover, the damping material piece is bonded on the first wall thickness gradually changing region and the second wall thickness gradually changing region.

[0027] The cylinder head cover provided by the utility model is provided with a wall thickness gradually changing region on the path from one end of the cylinder head cover side plate and the cylinder head cover fastening plate connection to the middle area of the cylinder head cover panel, the wall thickness of the wall thickness gradually changing region gradually changes, and the thinnest position of the wall thickness gradually changing region has a preset distance from the middle area of the cylinder head cover panel. When the vibration wave is transmitted to the middle area of the cylinder head cover panel through the cylinder head cover fastening plate, it will pass through the wall thickness gradually changing region, and because the thickness of the wall thickness gradually changing region gradually changes, when the thickness decreases, the wave number increases, the wave speed and the wavelength decrease, the wavelength of the elastic wave decreases and the wave speed reduces, and the elastic wave entering the acoustic black hole cannot be transmitted out, so that the wave energy gathering effect is realized. The boundary of the wall thickness gradually changing region of the utility model can realize the gathering vibration elastic wave effect, the vibration transmitted to the thinnest area of the wall thickness gradually changing region through the cylinder head cover bolt of the engine cannot continue to transmit forward, and the thinnest area has a preset distance from the middle area of the cylinder head cover panel, so that the vibration energy of the middle of the cylinder head cover panel can be reduced, and the vibration of the parts such as the oil supply pipe installed at the position can be reduced. Moreover, the overall vibration energy of the cylinder head cover can be reduced, and the radiation noise of the cylinder head cover can be reduced synchronously.

[0028] An engine comprising an engine body and the cylinder head cover as claimed in any one of the preceding claims, the cylinder head cover being fixed to the engine body by vibration isolation bolts.

[0029] The engine provided by the utility model has the above-mentioned cylinder head cover, so that all the technical effects of the above-mentioned cylinder head cover are combined, and the description is not repeated herein. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor.

[0031] Figure 1 It is a structure schematic view of the cylinder head cover disclosed by the utility model embodiments.

[0032] Figure 2 A plan view of the cylinder cover of the embodiment of the present application is disclosed.

[0033] Figure 3 A bottom view of the cylinder cover of the embodiment of the present application is disclosed.

[0034] Figure 4 A front view of the cylinder cover of the embodiment of the present application is disclosed.

[0035] Figure 5 A side view of the cylinder cover of the embodiment of the present application is disclosed.

[0036] Figure 6 A Figure 2 A sectional view along the line A-A.

[0037] Figure 7 A Figure 2 A sectional view along the line B-B.

[0038] The meanings of the respective reference numerals in the drawings are as follows.

[0039] 100 - cylinder cover body; 101 - cylinder cover panel; 102 - cylinder cover side plate; 103 - cylinder cover fastening plate

[0040] 1011 - oil filler pipe mounting hole; 1012 - equal wall thickness region; 1013 - second wall thickness gradual change region

[0041] 200 - damping material piece DETAILED DESCRIPTION

[0042] The core of the present application is to provide a cylinder cover to reduce the vibration at the middle position of the cylinder cover panel, so as to improve the reliability of the components installed at the position.

[0043] Another core of the present application is to provide an engine with the above-mentioned cylinder cover.

[0044] Hereinafter, the embodiments will be described with reference to the accompanying drawings. In addition, the embodiments shown below do not have any limiting effect on the utility model content recited in the claims. In addition, the entire content of the configuration represented in the following embodiments is not limited to being necessary as a solution to the utility model recited in the claims. It should be noted that, for the convenience of description, only the parts related to the utility model are shown in the drawings. In the case of no conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0045] As Figure 1 , Figure 3 , Figure 4 and Figure 5As shown, the cylinder cover of the utility model discloses a cylinder cover body 100, the cylinder cover body 100 includes cylinder cover panel 101, cylinder cover side plate 102 and cylinder cover fastening plate 103.

[0046] Wherein, the middle area of cylinder cover panel 101 is used for installing parts, for example, oil filler pipe mounting hole 1011 can be set in the middle area of cylinder cover panel 101 to make oil filler pipe extend out.If the middle area of cylinder cover panel 101 produces larger vibration, will act on oil filler pipe through oil filler pipe mounting hole 1011, cause oil filler pipe to loosen or wear, finally cause oil filler pipe to leak.

[0047] Cylinder cover side plate 102 is arranged at the edge of cylinder cover panel 101, and cylinder cover panel 101 and cylinder cover side plate 102 jointly enclose a cover body structure.Cylinder cover fastening plate 103 is connected to the end of cylinder cover side plate 102 away from cylinder cover panel 101, that is, one end of cylinder cover side plate 102 is connected to the edge of cylinder cover panel 101, and the other end is connected with cylinder cover fastening plate 103.Cylinder cover fastening plate 103 is used to realize the connection and fixation of cylinder cover and engine.Cylinder cover fastening plate 103 can be provided with fastener holes, and the fixation of cylinder cover is realized by the cooperation of fastener and fastener hole.The vibration source of engine cylinder body can also be conducted to cylinder cover panel 101 and cylinder cover side plate 102 through fastener and cylinder cover fastening plate 103, so that cylinder cover panel 101 vibrates.

[0048] At least in the end of cylinder cover side plate 102 connected with cylinder cover fastening plate 103, the path to the middle area of cylinder cover panel 101 has a wall thickness gradual change area, and the vibration elastic wave of engine cylinder body is conducted to cylinder cover panel 101 through cylinder cover fastening plate 103 and cylinder cover side plate 102.In the embodiment, the wall thickness gradual change area is added on the propagation path of vibration elastic wave to reduce the propagation of vibration elastic wave.

[0049] The thinnest position of wall thickness gradual change area has a preset distance from the middle area of cylinder cover panel 101, and the skilled person in the art can design the preset distance according to requirements, as long as the thinnest position of wall thickness gradual change area has a certain distance from the important parts of the middle area of cylinder cover panel 101, so as to prevent the vibration elastic wave from being conducted to the parts completely and causing damage to the parts and affecting the service life.

[0050] The cylinder cover provided by the utility model is provided with a wall thickness gradual change area on the path from the end of cylinder cover side plate 102 connected with cylinder cover fastening plate 103 to the middle area of cylinder cover panel 101, the wall thickness of the wall thickness gradual change area gradually changes, and the thinnest position of the wall thickness gradual change area has a preset distance from the middle area of cylinder cover panel 101.

[0051] When the vibration wave is transmitted to the middle area of the cylinder cover surface plate 101 through the cylinder cover cover fastening plate 103, it will pass through the wall thickness gradually changing area. Since the thickness of the wall thickness gradually changing area gradually changes, when the thickness decreases, the wave number increases, the wave speed and the wavelength decrease, the wavelength of the elastic wave decreases, the wave speed decreases, the elastic wave entering the acoustic black hole cannot be propagated, so that the wave energy gathering effect is realized.

[0052] The boundary of the wall thickness gradually changing area can realize the effect of gathering vibration elastic waves, so that when the vibration transmitted by the cylinder cover bolt of the engine reaches the thinnest area of the wall thickness gradually changing area, it cannot continue to propagate forward, and the thinnest area has a preset distance from the middle area of the cylinder cover surface plate 101, so that the vibration energy of the middle of the cylinder cover surface plate 101 can be reduced, and the vibration of the parts such as the oil filler pipe installed at this position can be reduced. Moreover, the reduction of the overall vibration energy of the cylinder cover can simultaneously reduce the radiation noise of the cylinder cover.

[0053] As shown in Figure 2 , Figure 6 and Figure 7 , the wall thickness gradually changing area at least includes a first wall thickness gradually changing area arranged on the cylinder cover side plate 102. In the embodiment, the cylinder cover side plate 102 has a wall thickness gradually changing area (i.e. the first wall thickness gradually changing area) thereon, and the cylinder cover side plate 102 is closer to the vibration source than the cylinder cover surface plate 101. Arranging the wall thickness gradually changing area on the cylinder cover side plate 102 can prevent the downstream transmission of vibration energy earlier.

[0054] The wall thickness gradually decreases in the direction from the first end to the second end of the first wall thickness gradually changing area. The first end of the wall thickness gradually changing area is the end close to the cylinder cover fastening plate 103, and the second end is the end close to the cylinder cover surface plate 101. That is, the thickness of the first wall thickness gradually changing area gradually decreases from the end close to the cylinder cover fastening plate 103 to the end away from the cylinder cover fastening plate 103.

[0055] Since the size of the cylinder cover side plate 102 is small, the entire cylinder cover side plate 102 can be designed as the first wall thickness gradually changing area. That is, the first end of the first wall thickness gradually changing area is the end of the cylinder cover side plate 102 connected to the cylinder cover fastening plate 103, and the second end of the first wall thickness gradually changing area is the end of the cylinder cover side plate 102 connected to the cylinder cover surface plate 101. In the embodiment, the two ends of the first wall thickness gradually changing area are designed as the same end as the two ends of the cylinder cover side plate 102, that is, the first wall thickness gradually changing area covers the entire cylinder cover side plate 102.

[0056] It should be noted that the first wall thickness gradually changing region can also cover only the part of the side plate 102 of the cylinder head cover, that is, an equal wall thickness region is designed on the side plate 102 of the cylinder head cover in addition to the first wall thickness gradually changing region. In order to improve the strength of the side plate 102 of the cylinder head cover, the thickness of the equal wall thickness region should be equal to the maximum thickness of the first wall thickness gradually changing region, and the equal wall thickness region is connected to the first end of the first wall thickness gradually changing region, that is, connected to the end with the maximum thickness of the first wall thickness gradually changing region.

[0057] In an embodiment of the utility model, the wall thickness gradually changing region further comprises a second wall thickness gradually changing region 1013 arranged on the surface plate 101 of the cylinder head cover. In this embodiment, the surface plate 101 of the cylinder head cover has a wall thickness gradually changing region (that is, the second wall thickness gradually changing region 1013), and the surface plate 101 of the cylinder head cover is closer to the parts than the side plate 102 of the cylinder head cover. Arranging the wall thickness gradually changing region on the surface plate 101 of the cylinder head cover can further prevent the transmission of vibration energy to the parts and improve the reliability of preventing vibration waves.

[0058] The wall thickness gradually decreases from the first end to the second end of the second wall thickness gradually changing region 1013, the first end of the wall thickness gradually changing region is the end far away from the side plate 102 of the cylinder head cover, and the second end is the end close to the side plate 102 of the cylinder head cover. In this embodiment, the end with the thinner thickness of the second wall thickness gradually changing region 1013 is designed to be thicker than the end with the thicker thickness, and is further away from the middle region of the surface plate 101 of the cylinder head cover, so that the vibration wave energy can be concentrated at a position further away from the middle region of the surface plate 101 of the cylinder head cover, so as to reduce the influence of the low vibration wave on the parts installed in the middle region of the surface plate 101 of the cylinder head cover.

[0059] Further, the second end of the second wall thickness gradually changing region 1013 is the end where the surface plate 101 of the cylinder head cover is connected to the side plate 102 of the cylinder head cover, that is, the thinnest position of the second wall thickness gradually changing region 1013 is arranged at the end where the surface plate 101 of the cylinder head cover is connected to the side plate 102 of the cylinder head cover. When the thinnest position of the first wall thickness gradually changing region is arranged at the end where the side plate 102 of the cylinder head cover is connected to the surface plate 101 of the cylinder head cover, the thinnest positions of the first wall thickness gradually changing region and the second wall thickness gradually changing region 1013 are located at the corner where the surface plate 101 of the cylinder head cover and the side plate 102 of the cylinder head cover are connected.

[0060] When the vibration wave propagates to the middle area of the cylinder head cover face plate 101 through the cylinder head cover fastening plate 103, the vibration wave passes through the wall thickness gradually changing area (the first wall thickness gradually changing area and the second wall thickness gradually changing area 1013), and the thickness of the wall thickness gradually changing area gradually changes, and when the thickness decreases, the wave number increases, the wave speed and the wavelength decrease, the wavelength of the elastic wave decreases, and the wave speed decreases, and the elastic wave entering the acoustic black hole cannot propagate out, so that the wave energy gathering effect is realized. Since the thinnest position of the first wall thickness gradually changing area and the second wall thickness gradually changing area 1013 is located at the corner where the cylinder head cover face plate 101 and the cylinder head cover side plate 102 are connected, the vibration elastic wave is gathered at the position where the cylinder head cover face plate 101 and the cylinder head cover side plate 102 are connected, and the vibration elastic wave is prevented from propagating to the middle area of the cylinder head cover face plate 101.

[0061] In an embodiment of the utility model, the cylinder head cover face plate 101 has an equal wall thickness area 1012, the equal wall thickness area 1012 is located in the middle area of the cylinder head cover face plate 101, and the second wall thickness gradually changing area 1013 is located around the equal wall thickness area 1012. That is, the equal wall thickness area 1012 is located in the middle area of the cylinder head cover face plate 101, and the second wall thickness gradually changing area 1013 is located in the edge area of the cylinder head cover face plate 101.

[0062] Further, the shape of the equal wall thickness area 1012 can be designed to be similar to the shape of the cylinder head cover face plate 101, that is, the equal wall thickness area 1012 is the shape of the cylinder head cover face plate 101 after being reduced in proportion. Taking the cylinder head cover face plate 101 as a rectangle as an example, for example, the length of the equal wall thickness area 1012 can be designed to be half of the length of the cylinder head cover face plate 101, and the width of the equal wall thickness area 1012 can be designed to be half of the width of the cylinder head cover face plate 101. It should be noted that a person skilled in the art can also design the shape and size of the equal wall thickness area 1012 according to requirements, and it is not limited to being similar to the shape of the cylinder head cover face plate 101, and it is not limited to being reduced in proportion.

[0063] In an embodiment of the utility model, the thickness of the first wall thickness gradually changing area and the second wall thickness gradually changing area 1013 changes according to a power function y = ex n +a 0 The thickness gradually changes, y is the thickness, that is, the ordinate, and x is the abscissa in the extension direction of the first wall thickness gradually changing area and the second wall thickness gradually changing area 1013.

[0064] Wherein, e is a constant, n is a power index, and is greater than or equal to 2, that is, the thickness of the first wall thickness gradually changing area and the second wall thickness gradually changing area 1013 changes in a curved manner. It should be noted that the thickness of the first wall thickness gradually changing area and the second wall thickness gradually changing area 1013 can also change in a linear manner, that is, change according to a linear function

[0065] a 0 the minimum thickness of the first wall thickness gradient region and the second wall thickness gradient region 1013, a 0 not less than 1 / 3 of the basic thickness of the cylinder head cover, the basic thickness of the cylinder head cover refers to the thickness of the plate material in other regions of the cylinder head cover, i.e. the non-wall thickness gradient region, and can also be understood as the thickness at the equal wall thickness region 1012, and can also be understood as the maximum thickness of the wall thickness gradient region; that is, the minimum thickness of the first wall thickness gradient region is not less than 1 / 3 of the maximum thickness of the first wall thickness gradient region, and the minimum thickness of the second wall thickness gradient region 1013 is not less than 1 / 3 of the maximum thickness of the second wall thickness gradient region 1013.

[0066] In an embodiment of the utility model, the cylinder head cover can further include a damping material piece 200, and the damping material piece 200 is arranged at least at one end of the first wall thickness gradient region and the second wall thickness gradient region 1013 with thinner thickness. Specifically, the damping material piece 200 can be bonded to the first wall thickness gradient region and the second wall thickness gradient region 1013 by bonding.

[0067] The damping material piece 200 can be made of rubber material with high damping property, and can be bonded to the intersection position of the cylinder head cover panel 101 and the cylinder head cover side plate 102, i.e. the intersection position of the height direction and the horizontal direction of the cylinder head cover body 100, by high-strength flexible glue. The damping material piece 200 can also be made of sprayed asphalt damping material, and the specific material of the damping material piece 200 is not limited in the embodiment. The thickness of the damping material piece 200 can be selected according to requirements, for example, the thickness of the damping material piece 200 can be greater than the thickness of the equal wall thickness region 1012 to improve the vibration absorption effect. It can be understood in the art that the thickness of the damping material piece 200 can also be lower than the thickness of the equal wall thickness region 1012.

[0068] The utility model utilizes the first wall thickness gradient region and the second wall thickness gradient region 1013 to gather vibration waves at the position with thinner thickness of the first wall thickness gradient region and the second wall thickness gradient region 1013, and increases the damping material piece 200 at the position with thinner thickness of the first wall thickness gradient region and the second wall thickness gradient region 1013, so that the vibration energy gathered at the position can be absorbed to reduce the vibration of the cylinder head cover.

[0069] The utility model discloses an engine, comprising an engine body and the cylinder head cover disclosed in the above embodiment, and the cylinder head cover is fixed on the engine body by vibration isolation bolts. The mounting point of the cylinder head cover is suspendedly mounted by the vibration isolation bolts, so that the transmission of the vibration of the mounting point is reduced. The engine disclosed by the utility model has the cylinder head cover described above, so it has all the technical effects of the cylinder head cover described above, which will not be described here.

[0070] As shown in the present application and claims, unless the context clearly indicates otherwise, the words "comprise", "comprising", "include", "including" and the like are to be construed in an inclusive sense, as opposed to an exclusive or exhaustive sense; that is to say, in the sense of "including, but not limited to". Similarly, the words "comprises", "comprising", "includes", "including" and the like can mean "including, but not limited to".

[0071] In the description of the present application, unless otherwise explicitly defined, the words such as "set", "install", "connect" and the like should be interpreted in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0072] The various embodiments in the specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be mutually referred to.

[0073] The principle and implementation mode of the present application are described by applying specific examples. The above description of the embodiments is only used to help understand the method and its core idea. It should be pointed out that, for the person skilled in the art, without departing from the principle of the present application, the present application can be improved and modified in many ways. These improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A cylinder head cover characterized by, The cylinder head cover comprises: a cylinder head cover face plate (101); a cylinder head cover side plate (102) arranged at the edge of the cylinder head cover face plate (101); a cylinder head cover fastening plate (103) connected to the end of the cylinder head cover side plate (102) away from the cylinder head cover face plate (101), wherein at least on the path from the end of the cylinder head cover side plate (102) connected to the cylinder head cover fastening plate (103) to the middle area of the cylinder head cover face plate (101), there is a wall thickness gradual change area, and the thinnest position of the wall thickness gradual change area has a preset distance from the middle area of the cylinder head cover face plate (101).

2. The cylinder head cover of claim 1, wherein The wall thickness gradual change area comprises at least a first wall thickness gradual change area arranged on the cylinder head cover side plate (102); In the direction from the first end to the second end of the first wall thickness gradual change area, the wall thickness gradually decreases, the first end of the wall thickness gradual change area is the end close to the cylinder head cover fastening plate (103), and the second end is the end close to the cylinder head cover face plate (101).

3. The cylinder head cover of claim 2, wherein, The first end of the first wall thickness gradual change area is the end of the cylinder head cover side plate (102) connected to the cylinder head cover fastening plate (103). The second end of the first wall thickness gradual change area is the end of the cylinder head cover side plate (102) connected to the cylinder head cover face plate (101).

4. The cylinder head cover of claim 2, wherein The wall thickness gradual change area further comprises a second wall thickness gradual change area (1013) arranged on the cylinder head cover face plate (101); In the direction from the first end to the second end of the second wall thickness gradual change area (1013), the wall thickness gradually decreases, the first end of the wall thickness gradual change area is the end away from the cylinder head cover side plate (102), and the second end is the end close to the cylinder head cover side plate (102).

5. The cylinder head cover of claim 4, wherein, The second end of the second wall thickness gradual change area (1013) is the end of the cylinder head cover face plate (101) connected to the cylinder head cover side plate (102).

6. The cylinder head cover of claim 5, wherein, The cylinder head cover face plate (101) has an equal wall thickness area (1012) in the middle area of the cylinder head cover face plate (101), and the second wall thickness gradual change area (1013) is located around the equal wall thickness area (1012).

7. The cylinder head cover of claim 4, wherein The thickness of the first and second wall thickness tapering regions (1013) is according to a power function y=ɛx n +a 0 tapering ɛ is constant; n Greater than or equal to 2; a 0 for the minimum thickness, a 0 not less than 1 / 3 of the base wall thickness of the head cover 8. The head cover of any one of claims 4-7, wherein, Further comprising a damping material piece (200) arranged at least on the thinner end of the first wall thickness gradual change area and the second wall thickness gradual change area (1013).

9. The cylinder head cover of claim 8, wherein, The damping material piece (200) is bonded to the first wall thickness gradual change area and the second wall thickness gradual change area (1013).

10. An engine characterized by, The cylinder head cover is fixed to the engine body by vibration isolation bolts.

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