CN215673114U - Assembling bolt, cylinder cover assembly, engine and vehicle - Google Patents

Abstract

The application provides a combined bolt which comprises a bolt part, a lining sleeve sleeved on the bolt part and a flexible pad sleeved on the lining sleeve; bolt spare is including the nut and the screw rod that are connected, and the bush is including the cap and the lining pole that are connected, and the flexible pad is including the first pad and the second pad that are connected, and the cap and the lining pole of bush are worn to establish in proper order to the screw rod of bolt spare, and the cap and the cooperation of nut butt, the external diameter of first pad is greater than the external diameter that the second was filled up, and first pad is located between cap and the second pad. The application provides a combination bolt, flexible pad are located between bush and the cylinder head cover, do not have direct contact between bush and the cylinder head cover, and bolt spare packing force passes through bush, flexible pad after bolt spare is tightened from this and covers, avoids the bush on the top metal directly compress tightly plastics cylinder head cover and lead to the cylinder head cover fracture. The application additionally provides a cylinder head assembly, an engine and a vehicle with the assembling bolt.

Description

Assembling bolt, cylinder cover assembly, engine and vehicle

Technical Field

The application belongs to the technical field of mechanical equipment, particularly, relates to a combination bolt, cylinder cap subassembly, engine and vehicle.

Background

The plastic cylinder head cover of the engine is fixed by adopting a combined bolt with a bush, for example, the utility model patent with the application number of 201420171710.6 discloses a combined bolt applied to an automobile engine, which comprises a nut, a bush, a clamping point and a screw rod, wherein the nut and the screw rod form the main body of the combined bolt, the screw rod is in a ladder shape, the end of the screw rod, which is close to the nut, is a thinner end, and the end of the screw rod is a thicker end; the screw rod on be provided with the bush, the bush on bead and nut flush cooperation, the bush on the inboard symmetric position of bead be equipped with two stuck points, stuck point home range be the thinner end of screw rod.

The form structure that adopts the assembly bolt of taking the bush to fix engine plastics cylinder head cover is simple, and the expense is low, and easy dismounting relies on the bush protrusion height to keep cover body sealing washer compression ratio, relies on bush protrusion height simultaneously plastics cylinder head cover and cylinder head body top surface direct contact when avoiding the bolt spare to tighten.

However, the plastic cylinder head cover is directly pressed by metal on the top surface of the existing defective bush, the flatness error of the plastic cylinder head cover is large, the cylinder head cover is easy to crack when being pressed, and the bush is likely to deform due to overlarge tightening torque.

SUMMERY OF THE UTILITY MODEL

The present application is directed to solving or improving at least one of the above technical problems.

In view of the above, a first object of the present application is to provide a combination bolt.

A second object of the present application is to provide a cylinder head assembly.

A third object of the present application is to provide an engine.

A fourth object of the present application is to provide a vehicle.

In order to achieve the purpose, the technical scheme of the application provides a combined bolt which comprises a bolt piece, a bushing sleeved on the bolt piece and a flexible pad sleeved on the bushing; bolt spare is including the nut and the screw rod that are connected, the bush is including the cap and the lining pole that are connected, the flexible pad is including the first pad and the second pad that are connected, the screw rod of bolt spare is worn to establish in proper order the cap and the lining pole of bush, the cap with the cooperation of nut butt, the external diameter of first pad is greater than the external diameter of second pad, first pad is located the cap with between the second pad.

According to the combined bolt provided by the application, the combined bolt comprises a bolt piece, a lining and a flexible pad, wherein the flexible pad comprises a first pad and a second pad which are connected, the first pad is positioned between a lining cap and the second pad, the outer diameter of the first pad is larger than that of the second pad, so that the outer wall of the flexible pad is in a step shape, when the combined bolt is used for fixing an engine plastic cylinder head cover, the flexible pad is positioned between the lining and the cylinder head cover, the lining and the cylinder head cover are not in direct contact, the first pad is abutted against the cylinder head cover along the axial direction of the bolt piece, the second pad is abutted against the cylinder head cover along the axial direction of the bolt piece, and meanwhile, the flexible pad is abutted against the lining cap and a lining rod of the lining, so that the pressing force of the bolt piece is transmitted to the cylinder head cover through the lining and the flexible pad after the bolt piece is tightened, and the phenomenon that the top metal on the lining directly presses the plastic cylinder head cover to cause the cracking of the cylinder head cover is avoided; the arrangement of the second pad not only increases the contact area between the bushing and the flexible pad, effectively prevents the flexible pad from excessively inclining in the connected object, but also reduces the shaking amount of the bolt piece and the bushing in the flexible pad; simultaneously, the flexible pad has a certain amount of elastic deformation, and the flexible pad atress compression after the bolt spare is tightened has ascending resilience force, can play the locking effect of taking off, therefore the combination bolt is more firm with being connected of cylinder head cover, and in addition, the flexible pad can absorb the vibration and play the cushioning effect, forms the protection to the bushing, avoids tightening too big power to a certain extent, leads to the bush to warp, influences the cover body sealing washer compression ratio.

In addition, the technical scheme provided by the application can also have the following additional technical characteristics:

in the technical scheme, the outer wall of the lining rod is provided with a limiting notch, the inner wall of the flexible pad is provided with a limiting bulge, and the limiting bulge and the limiting notch are matched to realize the positioning of the flexible pad on the lining.

In the technical scheme, the number of the limiting notches and the limiting protrusions is multiple.

In the above technical scheme, the limiting notch is an annular groove along a circumference of the lining rod, and the limiting protrusion is a block-shaped protrusion or an annular protrusion along a circumference of the flexible pad.

In the technical scheme, the inner wall of the bushing is provided with an annular protruding portion, the outer wall of the screw is provided with an annular limiting flange, the protruding portion is located between the limiting flange and the nut, the bushing is in sliding fit with the bolt piece through the protruding portion, and the limiting flange is used for limiting the protruding portion.

In the above technical solution, the outer diameter of the cap is larger than the outer diameter of the nut, and the outer diameter of the flexible pad is larger than the outer diameter of the cap.

For realizing the second purpose of this application, the technical scheme of this application provides a cylinder cap subassembly, including cylinder head body, cylinder head cover, cover body sealing washer and as any one of the above-mentioned technical scheme of this application the combination bolt, bolt spare wears to establish cylinder head cover, cover body sealing washer and cylinder head body in proper order in order to connect cylinder head body and cylinder head cover, and the bush that the cover was established on the bolt spare wears to establish in proper order behind cylinder head cover, the cover body sealing washer with the cylinder head body butt, and the bottom outer wall of the lining pole of bush is equipped with the snap ring along lining pole a week, flexible pad, partial cylinder head cover with cover body sealing washer is located the lining cap with between the snap ring, highly being less than flexible pad of bush, pressing from both sides and locating flexible pad with cylinder head cover between the cover body sealing washer cover with cover body sealing washer's thickness sum.

According to the cylinder head subassembly that this application provided, including the assembling bolt like this application above-mentioned any technical scheme, therefore it has the whole beneficial effect like this application above-mentioned any technical scheme's assembling bolt, and it is no longer repeated here.

To achieve the third object of the present application, an engine according to an aspect of the present application includes a compound bolt according to any one of the above aspects of the present application or a cylinder head assembly according to any one of the above aspects of the present application.

According to the present application, the engine includes the assembly bolt according to any one of the above technical solutions of the present application or the cylinder head assembly according to any one of the above technical solutions of the present application, so that the engine has all the beneficial effects of the assembly bolt according to any one of the above technical solutions of the present application or the cylinder head assembly according to any one of the above technical solutions of the present application, and details are not repeated herein.

In order to achieve the fourth object of the present application, the present application provides a vehicle, wherein a combination bolt according to any one of the above-mentioned technical solutions of the present application or a cylinder head assembly according to any one of the above-mentioned technical solutions of the present application or an engine according to any one of the above-mentioned technical solutions of the present application is provided on a vehicle body of the vehicle.

According to the present application, a vehicle includes a combination bolt according to any one of the above-mentioned technical solutions of the present application or a cylinder head assembly according to any one of the above-mentioned technical solutions of the present application or an engine according to any one of the above-mentioned technical solutions of the present application, so that the vehicle has all the advantages of the combination bolt according to any one of the above-mentioned technical solutions of the present application or the cylinder head assembly according to any one of the above-mentioned technical solutions of the present application or the engine according to any one of the above-mentioned technical solutions of the present application, and details thereof are not repeated herein.

Additional aspects and advantages of embodiments in accordance with the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of embodiments in accordance with the application.

Drawings

The above and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

FIG. 1 is a schematic structural view of a combination bolt according to one embodiment of the present application;

FIG. 2 is a schematic view of a bushing portion according to an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a cylinder head assembly according to an embodiment of the present application.

Wherein, the correspondence between the reference numbers and the part names of fig. 1 to 3 is:

10: a bolt member; 20: a bushing; 30: a flexible pad; 11: a nut; 12: a screw; 21: a liner cap; 22: a lining rod; 31: a first pad; 32: a second pad; 1: a limiting notch; 2: a limiting bulge; 3: a protrusion portion; 4: a limiting flange; 5: a cylinder cover body; 6: a cylinder head cover; 7: a cover body sealing ring; 8: a snap ring.

Detailed Description

In order that the above objects, features and advantages of the present application can be more clearly understood, the present application will be described in further detail with reference to the accompanying drawings and detailed description. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

Some embodiments of the present application are described below with reference to fig. 1-3.

Exemplary combination bolt

As shown in fig. 1 and 2, the present embodiment provides a composite bolt including a bolt member 10, a bushing 20 fitted over the bolt member 10, and a flexible pad 30 fitted over the bushing 20. The bolt piece 10 comprises a nut 11 and a screw 12 which are connected, the bushing 20 comprises a lining cap 21 and a lining rod 22 which are connected, the flexible pad 30 comprises a first pad 31 and a second pad 32 which are connected, the screw 12 of the bolt piece 10 sequentially penetrates through the lining cap 21 and the lining rod 22 of the bushing 20, the lining cap 21 is in butt fit with the nut 11, the outer diameter of the first pad 31 is larger than that of the second pad 32, and the first pad 31 is located between the lining cap 21 and the second pad 32.

The flexible cushion 30 may be a rubber cushion, specifically, the flexible cushion 30 is made of an AEM material, and the shore hardness is not lower than 75. Alternatively, the bolt member 10 is formed as an integral structure of the nut 11 and the bolt 12, and similarly, the bush 20 is formed as an integral structure of the cap 21 and the stem 22.

According to the present embodiment, there is provided a sectional bolt comprising a bolt member 10, a bush 20, and a flexible pad 30, the flexible pad 30 comprising a first pad 31 and a second pad 32 connected, the first pad 31 being located between a cap 21 and the second pad 32, the first pad 31 having an outer diameter larger than that of the second pad 32, so that the outer wall of the flexible pad 30 is stepped, when the combined bolt of the application is used for fixing the plastic cylinder head cover 6 of the engine, the flexible pad 30 is positioned between the bush 20 and the cylinder head cover 6, the bush 20 and the cylinder head cover 6 are not in direct contact, the first pad 31 is abutted against the cylinder head cover 6 along the axial direction of the bolt member 10, the second pad 32 is abutted against the cylinder head cover 6 along the axial direction of the bolt member 10, meanwhile, the flexible pad 30 is abutted against the lining cap 21 and the lining rod 22 of the bush 20, therefore, after the bolt pieces 10 are tightened, the pressing force of the bolt pieces 10 is transmitted to the cylinder head cover 6 through the bush 20 and the flexible pad 30, and the problem that the cylinder head cover 6 is cracked due to the fact that top metal on the bush 20 directly presses the plastic cylinder head cover 6 is avoided; the second pad 32 is provided not only to make the contact area of the bush 20 with the flexible pad 30 large, effectively prevent the flexible pad 30 from excessively inclining in the connected object, but also to reduce the shaking amount of the bolt member 10 and the bush 20 in the flexible pad 30; meanwhile, the flexible pad 30 has a certain amount of elastic deformation, the flexible pad 30 is compressed by force after the bolt piece 10 is tightened, upward resilience force is generated, and the loosening prevention effect can be achieved, so that the connection between the combined bolt and the cylinder head cover 6 is more stable, in addition, the flexible pad 30 can absorb vibration and achieve the buffering effect, the liner 20 is protected, and the phenomenon that the tightening force is too large to a certain extent, so that the liner 20 deforms and the compression rate of the seal ring 7 of the cover body is affected is avoided.

In order to ensure that the flexible pad 30 cannot easily fall off the bushing 20, the outer wall of the bushing rod 22 is provided with a limiting notch 1, the inner wall of the flexible pad 30 is provided with a limiting protrusion 2, and the limiting protrusion 2 and the limiting notch 1 are matched to realize the positioning of the flexible pad 30 on the bushing 20. Specifically, when the flexible pad 30 slides in place, the limiting protrusion 2 is clamped into the limiting notch 1, so that the flexible pad 30 is positioned on the bushing 20. Wherein, spacing notch 1 and spacing arch 2's quantity can be a plurality ofly, and is concrete, and spacing notch 1 can be arranged for the punctiform to can set up a plurality ofly, it is corresponding, and spacing arch 2 also is arranged for the punctiform, and sets up a plurality ofly, and spacing notch 1 also can be along the cyclic annular groove of lining rod 22 a week, and at this moment, spacing arch 2 both can be massive arch, also can be along the cyclic annular arch of flexible pad 30 a week. Thus, the flexible pad 30 can be clamped to the bushing 20 of the assembly bolt by interference and retention.

Preferably, the outer diameter of the nut 21 is larger than the outer diameter of the nut 11, the outer diameter of the flexible pad 30 is larger than the outer diameter of the nut 21, the contact surface of the nut 11 of the assembly bolt and the connected object is not in direct contact with the connected object but is separated by the nut 21 and the flexible pad 30, and the outer diameter of the nut 21 is larger than the outer diameter of the nut 11, the outer diameter of the flexible pad 30 is larger than the outer diameter of the nut 21, so that the contact area between the contact surface of the nut 11 and the connected object is increased, the pressure per unit area is reduced, the stress concentration of the contact surface is effectively reduced, and the connection between the assembly bolt and the connected object is more reliable.

Preferably, the inner wall of the bush 20 is provided with an annular protrusion 3, the outer wall of the screw 12 is provided with an annular limiting flange 4, the protrusion 3 is located between the limiting flange 4 and the nut 11, the bush 20 is in sliding fit with the bolt 10 through the protrusion 3, the limiting flange 4 is used for limiting the protrusion 3, namely, a gap exists between the inner wall of the bush 20 and the outer wall of the screw 12, the bush 20 is abutted to the outer wall of the screw 12 through the protrusion 3, and due to the existence of the limiting flange 4, the bush cannot be separated from the bolt.

As can be seen from the above, the assembling bolt of the present invention comprises a bolt member 10, a bush 20, and a flexible pad 30, the flexible pad 30 comprises a first pad 31 and a second pad 32 connected, the first pad 31 is located between a cap 21 and the second pad 32, the outer diameter of the first pad 31 is larger than that of the second pad 32, so that the outer wall of the flexible pad 30 is stepped, when the combined bolt of the application is used for fixing the plastic cylinder head cover 6 of the engine, the flexible pad 30 is positioned between the bush 20 and the cylinder head cover 6, the bush 20 and the cylinder head cover 6 are not in direct contact, the first pad 31 is abutted against the cylinder head cover 6 along the axial direction of the bolt member 10, the second pad 32 is abutted against the cylinder head cover 6 along the axial direction of the bolt member 10, meanwhile, the flexible pad 30 is abutted against the lining cap 21 and the lining rod 22 of the bush 20, therefore, after the bolt pieces 10 are tightened, the pressing force of the bolt pieces 10 is transmitted to the cylinder head cover 6 through the bush 20 and the flexible pad 30, and the problem that the cylinder head cover 6 is cracked due to the fact that top metal on the bush 20 directly presses the plastic cylinder head cover 6 is avoided; the second pad 32 is provided not only to make the contact area of the bush 20 with the flexible pad 30 large, effectively prevent the flexible pad 30 from excessively inclining in the connected object, but also to reduce the shaking amount of the bolt member 10 and the bush 20 in the flexible pad 30; meanwhile, the flexible pad 30 has a certain amount of elastic deformation, the flexible pad 30 is compressed by force after the bolt piece 10 is tightened, upward resilience force is generated, and the loosening prevention effect can be achieved, so that the connection between the combined bolt and the cylinder head cover 6 is more stable, in addition, the flexible pad 30 can absorb vibration and achieve the buffering effect, the liner 20 is protected, and the phenomenon that the tightening force is too large to a certain extent, so that the liner 20 deforms and the compression rate of the seal ring 7 of the cover body is affected is avoided.

Exemplary Cylinder head Assembly

As shown in fig. 1, 2 and 3, the present embodiment provides a cylinder head assembly including a cylinder head body 5, a cylinder head cover 6, a cover gasket 7 and a combining bolt as in the above embodiments.

Since the cylinder head assembly is provided with the assembling bolt, the cylinder head assembly has all the technical effects of the assembling bolt.

Wherein, the bolt piece 10 of assembling bolt wears to establish cylinder head cover 6, cover body sealing washer 7 and cylinder head body 5 in proper order in order to connect cylinder head body 5 and cylinder head cover 6, and the bush 20 that the cover was established on the bolt piece 10 wears to establish cylinder head cover 6, cover body sealing washer 7 back and cylinder head body 5 butt in proper order, relies on bush 20 protrusion height to avoid plastics cylinder head cover 6 and 5 top surface direct contacts of cylinder head body when bolt piece 10 is tightened.

The outer wall of the bottom end of the lining rod 22 of the lining 20 is provided with a snap ring 8 along the periphery of the lining rod 22, a flexible gasket 30, a part of the cylinder head cover 6 and a cover body sealing ring 7 are positioned between the lining cap 21 and the snap ring 8, the flexible gasket 30 is positioned on the upper side of the part of the cylinder head cover 6 between the lining cap 21 and the snap ring 8, and the cover body sealing ring 7 is positioned on the lower side of the part of the cylinder head cover 6 between the lining cap 21 and the snap ring 8.

The height of the bush 20 is smaller than the sum of the thicknesses of the flexible gasket 30, the cylinder head cover 6 and the cover body seal ring 7 interposed between the flexible gasket 30 and the cover body seal ring 7. To ensure a certain amount of compression of the flexible gasket 30 and the cover sealing ring 7. The flexible gasket 30 and the cover sealing ring 7 may be rubber members. After the bolt pieces 10 are tightened, the vibration of the head cover 6 itself is gradually eliminated by the cushioning and absorption of both the flexible gasket 30 and the cover seal ring 7, reducing the noise due to the vibration of the head cover 6 itself.

The outer edge fillet setting of snap ring 8 one end of back to cap 21 like this, bush 20 can reduce the resistance when wearing to establish cover body sealing washer 7, makes things convenient for bush 20 to get into cover body sealing washer 7, can protect cover body sealing washer 7 simultaneously.

Preferably, the hardness of the flexible pad 30 is greater than that of the cover sealing ring 7, for example, AEM rubber with shore hardness of 75 is used as the flexible pad 30, and the hardness of the cover sealing ring 7 is 60, that is, the flexible pad 30 is required to be harder than the cover sealing ring 7, so that the compression ratio of the cover sealing ring 7 can be ensured. Wherein, AEM rubber is full-name ethylene acrylate rubber.

Exemplary Engine

This embodiment provides an engine comprising a combination bolt or head assembly as in the previous embodiments.

Since the engine is provided with the above-described assembling bolt or the cylinder head assembly, the engine has all the technical effects of the above-described assembling bolt or the cylinder head assembly.

Exemplary vehicle

The embodiment provides a vehicle, and the vehicle body of the vehicle is provided with the combined bolt or the cylinder cover assembly or the engine in the embodiment.

Since the vehicle is provided with the above-described assembling bolt or cylinder head assembly or engine, the vehicle has all the technical effects of the above-described assembling bolt or cylinder head assembly or engine.

In this application, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless expressly limited otherwise. The terms "mounted," "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be a fixed connection, a removable connection, or an integral connection; "coupled" may be direct or indirect through an intermediary. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In the description of the present application, it is to be understood that the terms "upper", "lower", "left", "right", "front", "rear", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or unit must have a specific direction, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application.

In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A combined bolt is characterized in that a bolt body is provided with a bolt head,

comprises a bolt piece (10), a bushing (20) sleeved on the bolt piece (10), and a flexible pad (30) sleeved on the bushing (20);

bolt spare (10) are including nut (11) and screw rod (12) that are connected, bush (20) are including cap (21) and the pin (22) that are connected, flexible pad (30) are including first pad (31) and the second pad (32) that are connected, screw rod (12) of bolt spare (10) wear to establish in proper order cap (21) and pin (22) of bush (20), cap (21) with nut (11) butt cooperation, the external diameter of first pad (31) is greater than the external diameter of second pad (32), first pad (31) are located cap (21) with between second pad (32).

2. The assembling bolt according to claim 1, characterized in that the outer wall of the lining rod (22) is provided with a limiting notch (1), the inner wall of the flexible cushion (30) is provided with a limiting protrusion (2), and the limiting protrusion (2) and the limiting notch (1) are matched to realize the positioning of the flexible cushion (30) on the bushing (20).

3. A assembling bolt according to claim 2, characterized in that the number of the limiting recesses (1) and the limiting protrusions (2) is plural; and/or the limiting notch (1) is an annular groove along the periphery of the lining rod (22), and the limiting protrusion (2) is a block-shaped protrusion or an annular protrusion along the periphery of the flexible pad (30).

4. The combination bolt according to claim 1, characterized in that the inner wall of the bushing (20) is provided with an annular protrusion (3), the outer wall of the screw (12) is provided with an annular limiting flange (4), the protrusion (3) is located between the limiting flange (4) and the nut (11), the bushing (20) is in sliding fit with the bolt member (10) through the protrusion (3), and the limiting flange (4) is used for limiting the protrusion (3).

5. A modular bolt according to any one of claims 1 to 4, characterised in that the external diameter of the cap (21) is greater than the external diameter of the nut (11), and the external diameter of the pad (30) is greater than the external diameter of the cap (21).

6. A cylinder head assembly, characterized by, including cylinder head body (5), cylinder head cover (6), cover body sealing washer (7) and the assembling bolt of any one of claims 1 to 5, bolt spare (10) wear to establish cylinder head cover (6), cover body sealing washer (7) and cylinder head body (5) in proper order and are in order to connect cylinder head body (5) and cylinder head cover (6), and bush (20) that the cover was established on bolt spare (10) wears to establish cylinder head cover (6), cover body sealing washer (7) in proper order after with cylinder head body (5) butt, and the bottom outer wall of the lining rod (22) of bush (20) is equipped with snap ring (8) along lining rod (22) a week, flexible pad (30), part cylinder head cover (6) and cover body sealing washer (7) are located lining cap (21) with between snap ring (8), the height of bush (20) is less than flexible pad (30), presss from both sides and locates flexible pad (30) and cylinder head cover (6) between the sealing washer (7) cover The thickness sum of the cover body sealing ring (7).

7. Cylinder head assembly according to claim 6, in which the outer edge of the snap ring (8) facing away from the end of the cap is rounded.

8. The cylinder head assembly of claim 6 or 7,

the hardness of the flexible pad (30) is greater than that of the cover body sealing ring (7).

9. An engine comprising a compound bolt as claimed in any one of claims 1 to 5 or a head assembly as claimed in any one of claims 6 to 8.

10. A vehicle, characterized in that a combination bolt according to any one of claims 1 to 5 or a cylinder head assembly according to any one of claims 6 to 8 or an engine according to claim 9 is provided on a vehicle body of the vehicle.

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