Cylinder cover gasket and engine

Abstract

According to the scheme, the cylinder cover gasket comprises a cylinder gasket body, a cylinder hole, bolt holes and a cylinder hole sealing belt, the cylinder hole, the bolt holes and the cylinder hole sealing belt are formed in the cylinder gasket body, and the bolt holes are formed in the periphery of the cylinder hole; the cylinder hole sealing belt is located on the periphery of the cylinder hole and provided with a base circle, the base circle and the cylinder hole are concentrically arranged, the cylinder hole sealing belt comprises a first area close to the bolt hole and a second area away from the bolt hole, the first area and the second area are alternately arranged, the base circle serves as a boundary, the first area deviates in the direction away from the center of the base circle, and the second area deviates in the direction away from the center of the base circle. And the second area deviates towards the center of the base circle. According to the cylinder cover gasket, the cylinder hole sealing belt structure is adjusted according to the cylinder sleeve pre-deformation condition, the first area deviates in the direction away from the center of the base circle, and the second area deviates in the direction close to the center of the base circle. Therefore, even if the cylinder sleeve deforms, the sealing performance between the cylinder cover gasket and the cylinder sleeve can still be guaranteed, and the sealing performance of a cylinder cover and an engine body is improved.

Description

TECHNICAL FIELD

[0001] The application relates to the engine technical field, in particular to a cylinder head gasket and an engine. BACKGROUND

[0002] The cylinder head is installed on the engine body by bolts, and a gasket is arranged between the cylinder head and the engine body. The cylinder bore of the engine body is deformed after long-term operation, and finally the steel sleeve located in the cylinder bore is deformed, thereby affecting the sealing performance of the gasket and the engine body.

[0003] Therefore, how to improve the sealing performance of the cylinder head and the engine body becomes a technical problem to be solved by the person skilled in the art. CONTENT OF THE UTILITY MODEL

[0004] The application provides a cylinder head gasket and an engine to improve the sealing performance of the cylinder head and the engine body.

[0005] In order to achieve the above-mentioned purpose, the application discloses the following technical scheme:

[0006] In a first aspect, the application provides a cylinder head gasket, which comprises a cylinder gasket body, and a cylinder bore, a bolt hole and a cylinder bore sealing band arranged on the cylinder gasket body,

[0007] The bolt hole is arranged around the cylinder bore; the cylinder bore sealing band is located around the cylinder bore and has a base circle, the base circle is concentrically arranged with the cylinder bore, the cylinder bore sealing band comprises a first region close to the bolt hole and a second region away from the bolt hole, the first region and the second region are arranged alternately, the first region is offset in a direction away from the center of the base circle, and the second region is offset in a direction close to the center of the base circle.

[0008] In some embodiments, the first region has a first center point, and the first center point is in the same plane as the center of the bolt hole and the center of the cylinder bore.

[0009] In some embodiments, the second region has a second center point, and the second center point is equal to the included angle between the two adjacent first center points.

[0010] In some embodiments, the second center point is smoothly connected with the two adjacent first center points.

[0011] In some embodiments, the periphery of the cylinder bore is provided with an upper edge, and the upper edge is recessed inwardly from the end surface of the cylinder gasket body to form; the cylinder bore sealing band is located in the upper edge.

[0012] In some embodiments, the outer periphery of the bolt hole is provided with a bolt sealing band.

[0013] In some embodiments, the cylinder head gasket further comprises an oil hole, and the outer periphery of the oil hole is provided with an oil hole sealing band.

[0014] In some embodiments, the cylinder head gasket further comprises a water hole, and a water hole sealing band is arranged on the outer periphery of the water hole.

[0015] In some embodiments, the cylinder head gasket further comprises a limiting layer, and the limiting layer is located at both ends of the cylinder head gasket in the length direction.

[0016] In a second aspect, the application provides an engine, comprising a body, a cylinder head and a cylinder head gasket as described above, and the cylinder head gasket is located between the body and the cylinder head.

[0017] From the above technical solution, it can be seen that the cylinder head gasket according to the application adjusts the cylinder hole sealing band structure according to the pre-deformation of the cylinder liner, the first area is offset in the direction away from the center of the base circle, and the second area is offset in the direction close to the center of the base circle. Therefore, even if the cylinder liner deforms, the cylinder head gasket of the application can still ensure the sealing performance between the cylinder liner and the cylinder head, and improve the sealing performance of the cylinder head and the body (improve the performance of the engine). BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or prior art description. Obviously, the drawings in the following description are only some examples or embodiments of the application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of the provided drawings, and the application can also be applied to other similar scenarios on the basis of the provided drawings. Unless it is obvious from the language environment or otherwise stated, the same reference numerals in the drawings represent the same structure or operation.

[0019] Figure 1 A cylinder liner deformation simulation schematic diagram of the prior art is provided;

[0020] Figure 2 A top view of a cylinder head gasket according to an embodiment of the application is provided;

[0021] Figure 3 A Figure 2 sectional view of A-A in the figure;

[0022] Figure 4 A Figure 2 enlarged view of the cylinder hole sealing band;

[0023] In the figure: 1-body; 12-cylinder liner;

[0024] 2-cylinder head gasket; 21-cylinder gasket body; 211-limiting layer;

[0025] 22 - cylinder bore; 23 - bolt hole; 24 - bolt sealing band; 25 - cylinder bore sealing band; 26 - oil hole; 27 - oil hole sealing band; 28 - water hole; 29 - water hole sealing band;

[0026] 251 - first area; 251a - first center point; 252 - second area; 252a - second center point. DETAILED DESCRIPTION

[0027] The application will be further described below in conjunction with the drawings and examples. It can be understood that the specific examples described herein are only used to explain the application, and not to limit the application. The described examples are only a part of the examples of the application, not all examples. Based on the examples in the application, all other examples obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0028] Cylinder bore deformation: Cylinder bore deformation refers to the change in shape of the cylindrical space inside the engine cylinder (i.e. the cylinder bore) due to various reasons, which no longer maintains the ideal circular shape.

[0029] Cylinder head gasket: Cylinder head gasket refers to the part located between the engine block and the cylinder head, which mainly ensures the tight connection between the two parts, preventing the leakage of coolant, oil and combustion gas.

[0030] Referring to Figure 1 , Figure 1 The overall deformation of the cylinder liner 11 of the engine block 1 is shown.

[0031] The cylinder head is installed on the engine block 1 by bolts, and the cylinder head gasket 2 is arranged between the two. The cylinder bore 22 of the engine block 1 will deform during long-term operation. If the cylinder bore 22 deformation exceeds the limit, it will cause the piston to leak, which will seriously affect the performance and reliability of the engine.

[0032] The inventors have found that under the action of the cylinder head bolt axial force, due to the uneven stiffness distribution of the cylinder head and the engine block 1, the cylinder liner 11 is extruded by the contact surface of the engine block 1 and the sealing band of the cylinder head gasket 2, which will produce cylinder liner 11 deformation with obvious regular relationship with the bolt distribution form. Taking a single-cylinder 6-bolt uniform distribution engine as an example, after applying the bolt axial force, the cylinder bore 22 near the bolt is concave, the cylinder bore 22 between the two bolts is convex, and the cylinder bore 22 deformation of the cylinder liner 6 stage is easy to exceed the limit, thereby affecting the sealing performance of the cylinder head and the engine block 1. The core point of the application is to change the shape of the cylinder bore sealing band 25 on the cylinder head gasket 2 by studying the deformation of the cylinder liner 11, so that the cylinder bore sealing band 25 still maintains sealing cooperation with the cylinder liner 11 when deformed, so as to offset the leakage problem caused by the uneven structure stiffness of the cylinder liner 11 deformation.

[0033] Referring to Figures 2 to 4 , in order to achieve the above object, the application discloses the following technical scheme:

[0034] The application provides a cylinder head gasket 2, comprising a cylinder gasket body 21, and a cylinder hole 22, a bolt hole 23 and a cylinder hole sealing band 25 provided on the cylinder gasket body 21, the bolt hole 23 is arranged around the cylinder hole 22; the cylinder hole sealing band 25 is located at the outer periphery of the cylinder hole 22 and has a base circle O, the base circle O is concentrically arranged with the cylinder hole 22, the cylinder hole sealing band 25 comprises a first area 251 close to the bolt hole 23 and a second area 252 away from the bolt hole 23, the first area 251 and the second area 252 are arranged alternately, taking the base circle O as the boundary line, the first area 251 is offset in the direction away from the center of the base circle O, and the second area 252 is offset in the direction close to the center of the base circle O.

[0035] The cylinder head gasket 2 according to the application adjusts the structure of the cylinder hole sealing band 25 according to the pre-deformation of the cylinder sleeve 11, the first area 251 is offset in the direction away from the center of the base circle O, and the second area 252 is offset in the direction close to the center of the base circle O. Therefore, even if the cylinder sleeve 11 deforms, the cylinder head gasket 2 of the application can still ensure the sealing performance between the cylinder sleeve 11 and the cylinder head gasket 2, and improve the sealing performance of the cylinder head and the engine block 1 (improve the performance of the engine).

[0036] In order to improve the sealing effect of the application, the first area 251 has a first center point 251a, and the first center point 251a is in the same plane as the center of the bolt hole 23 and the center of the cylinder hole 22. The center line of the bolt hole 23 and the center of the cylinder hole 22 has the maximum probability of deformation, so that the first center point 251a of the first area 251 is offset by the maximum distance to offset the deformation amount when the cylinder sleeve 11 deforms.

[0037] Since the cylinder head and the engine block 1 are usually connected by uniformly distributing the bolts around the cylinder hole 22, the bolt holes 23 are uniformly distributed around the cylinder hole 22, therefore, the second area 252 has a second center point 252a, the second center point 252a is equal to the included angle a1 and a2 between the first center points 251a of the two adjacent first areas 251, the second center point 252a of the second area 252 is offset by the maximum distance, and such arrangement can offset the deformation amount of the cylinder sleeve 11 to the maximum extent.

[0038] In order to facilitate processing, the second center point 252a of the second area 252 is smoothly connected with the first center points 251a of the two adjacent first areas 251.

[0039] It should be noted that the number of the first area 251 and the second area 252 is adjusted according to the number of the bolt hole 23. When the number of the bolt hole 23 is four, the first area 251 and the second area 252 are four. When the number of the bolt hole 23 is five, the first area 251 and the second area 252 are five. When the number of the bolt hole 23 is six, the first area 251 and the second area 252 are six. The examples of the present application are mainly described based on the condition that the number of the bolt hole 23 is six.

[0040] The upper cylinder hole sealing band 25 is directly arranged at the opening of the cylinder hole 22, or in some examples of the present application, the periphery of the cylinder hole 22 is provided with an upper edge which is recessed inward from the end face of the cylinder gasket body 21 to form; the cylinder hole sealing band 25 is located in the upper edge.

[0041] In order to improve the sealing performance of the cylinder head gasket 2 of the present application, the outer periphery of the bolt hole 23 is provided with a bolt sealing band 24.

[0042] Since the engine block 1 is provided with oil and water channels, the cylinder head gasket 2 further comprises an oil hole 26, and the outer periphery of the oil hole 26 is provided with an oil hole sealing band 27; the cylinder head gasket 2 further comprises a water hole 28, and the outer periphery of the water hole 28 is provided with a water hole sealing band 29. The arrangement position of the above-mentioned oil hole 26 and water hole 28 is adjusted according to the arrangement form of the oil and water channels on the engine block 1, which will not be described here.

[0043] In order to facilitate the installation of the cylinder head gasket 2, the cylinder head gasket 2 further comprises a limiting layer 211 which is located at both ends of the length direction of the cylinder head gasket 2. It should be noted that the cylinder head gasket 2 has a length direction, a width direction and a thickness direction, which correspond to the length, width and thickness of itself, respectively. When installed on the engine block 1, it corresponds to the length, width and thickness of the engine block 1.

[0044] The present application provides an engine comprising an engine block 1, a cylinder head and a cylinder head gasket 2 as described above, and the cylinder head gasket 2 is located between the engine block 1 and the cylinder head. Since the above-mentioned cylinder head gasket 2 has the above effects, the engine comprising the cylinder head gasket 2 has corresponding effects, which will not be described here.

[0045] The above description is only a preferred embodiment of the present application and a description of the technical principles used, and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. The scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above application concept. For example, the above-mentioned features are replaced with each other to form a technical solution with similar functions disclosed in the present application (but not limited to).

Claims

1. A cylinder head gasket, characterized by The cylinder head gasket (2) comprises a cylinder head gasket body (21), a cylinder hole (22), a bolt hole (23) and a cylinder hole sealing band (25) provided on the cylinder head gasket body (21), The bolt hole (23) is arranged around the cylinder hole (22); the cylinder hole sealing band (25) is located at the outer periphery of the cylinder hole (22) and has a base circle (O) arranged concentrically with the cylinder hole (22), the cylinder hole sealing band (25) comprises a first area (251) close to the bolt hole (23) and a second area (252) away from the bolt hole (23), the first area (251) and the second area (252) are arranged alternately, the first area (251) is offset in a direction away from the center of the base circle (O), and the second area (252) is offset in a direction close to the center of the base circle (O).

2. The cylinder head gasket of claim 1 wherein, The first area (251) has a first center point (251a), and the first center point (251a) is in the same plane as the center of the bolt hole (23) and the center of the cylinder hole (22).

3. The cylinder head gasket of claim 2 wherein, The second area (252) has a second center point (252a), and the second center point (252a) is equal to the included angle between the two adjacent first center points (251a).

4. The cylinder head gasket of claim 3 wherein, The second center point (252a) is smoothly connected with the two adjacent first center points (251a).

5. The cylinder head gasket of claim 1 wherein, The periphery of the cylinder hole (22) is provided with an upper edge which is recessed inward from the end surface of the cylinder head gasket body (21); and the cylinder hole sealing band (25) is located in the upper edge.

6. The cylinder head gasket of claim 1 wherein, The outer periphery of the bolt hole (23) is provided with a bolt sealing band (24).

7. The cylinder head gasket of claim 1 wherein, The cylinder head gasket (2) further comprises an oil hole (26), and the outer periphery of the oil hole (26) is provided with an oil hole sealing band (27).

8. The cylinder head gasket of claim 1 wherein, The cylinder head gasket (2) further comprises a water hole (28), and the outer periphery of the water hole (28) is provided with a water hole sealing band (29).

9. The cylinder head gasket of claim 1 wherein, The cylinder head gasket (2) further comprises a limiting layer (211) located at both ends of the cylinder head gasket (2) in the length direction.

10. An engine characterized by, The engine comprises a body, a cylinder head and the cylinder head gasket according to any one of claims 1 to 9, and the cylinder head gasket is located between the body and the cylinder head.

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