CN219061861U - Engine cylinder cover and engine - Google Patents

Abstract

The utility model discloses an engine cylinder cover and an engine, wherein the engine cylinder cover comprises an exhaust passage, a first push rod hole and a bolt connecting hole which are sequentially distributed at intervals along a first direction; the push rod assembly comprises a bushing fixedly inserted into the first push rod hole and a first push rod which is slidably inserted into the insertion hole of the bushing; the central axis of bush and the central axis of first push rod are collinear, along the first direction, and the central axis of bush is located between the central axis of first push rod hole and the central axis of bolted connection hole, and the outer peripheral face of bush forms first thermal-insulated clearance with the lateral wall that is close to the exhaust passage on the first push rod hole, and the outer peripheral face of bush is laminated or is formed the thermal-insulated clearance of second with the lateral wall that is close to the bolted connection hole on the first push rod hole, and first thermal-insulated clearance is greater than the thermal-insulated clearance of second. The heat emitted by the high-temperature gas in the exhaust passage can be isolated, the exhaust passage can be increased to enable the exhaust to be smooth, the bearing capacity of the side wall of the bolt connecting hole is improved, and the reliability of the engine is improved.

Description

Engine cylinder cover and engine

Technical Field

The utility model relates to the technical field of engines, in particular to an engine cylinder cover and an engine.

Background

The cylinder head of the engine is used for sealing the cylinder, forms a sealed combustion chamber with the cylinder, and is responsible for exhausting the exhaust gas in the cylinder, and is one of important components of the engine. Therefore, the good exhaust capacity can reduce pumping loss, reduce combustion temperature, improve efficiency of the supercharger, improve excess air coefficient, ensure reliability of the engine and greatly improve thermal efficiency of the engine.

The utility model provides a cylinder head among the prior art, it mainly includes the cylinder head body and sets up in the push rod subassembly of cylinder head body, the push rod subassembly mainly includes bush and push rod etc. specifically, the cylinder head body is equipped with the exhaust passage, set up in the push rod hole of exhaust passage one side, and set up in the cylinder head bolted connection hole of push rod hole one side, push rod hole and cylinder head bolted connection hole are located the same side of exhaust passage, and the exhaust passage is kept away from to the relative push rod hole of cylinder head bolted connection hole, bush fixed assembly is in the push rod hole, and form annular thermal-insulated clearance along circumference and the lateral wall in push rod hole, the push rod is inserted and is located the bush along the axial slip, bush and thermal-insulated clearance insulate against heat the push rod. The central axis of the bushing, the central axis of the push rod and the central axis of the push rod hole are all collinear, and the bushing has a certain wall thickness, meanwhile, a heat insulation gap is reserved for heat insulation, so that the diameter of the push rod hole processed on the cylinder cover is larger than that of the push rod, the space of the exhaust passage is compressed, and the smoothness of the exhaust passage is affected.

Disclosure of Invention

The utility model aims to provide an engine cylinder cover and an engine so as to solve the problem that in the prior art, reliability risks exist in the wall thickness of a cylinder cover bolt connecting hole and the wall thickness of a push rod hole.

To achieve the purpose, the utility model adopts the following technical scheme:

an engine cylinder head, comprising:

the cylinder cover body is provided with a hole group, and the hole group comprises exhaust passages, first push rod holes and bolt connecting holes which are sequentially distributed on the cylinder cover body at intervals along a first direction;

the push rod assembly comprises a bushing fixedly inserted into the first push rod hole and a first push rod slidingly inserted into an insertion hole of the bushing;

the central axis of bush with the central axis of first push rod is collinear, and follows the first direction, the central axis of bush is located the central axis of first push rod hole with between the central axis of bolted connection hole, the outer peripheral face of bush with be close to on the first push rod hole the lateral wall of exhaust passage forms first thermal-insulated clearance, the outer peripheral face of bush with be close to on the first push rod hole the lateral wall laminating of bolted connection hole or form the second thermal-insulated clearance, first thermal-insulated clearance is greater than the second thermal-insulated clearance.

Preferably, the first push rod hole comprises a first push rod hole section, a second push rod hole section and a third push rod hole section which are sequentially communicated, the bushing comprises a first bushing section and a second bushing section which are connected, the first bushing section is inserted in the first push rod hole section in an interference manner, the second bushing section is inserted in the second push rod hole section in a clearance manner and is inserted in the third push rod hole section in an interference manner, a first heat insulation gap is formed between the outer peripheral surface of the second bushing section and the side wall of the second push rod hole section, which is close to the exhaust passage, and the outer peripheral surface of the second bushing section is attached to the side wall of the second push rod hole section, which is close to the bolt connection hole, or forms a second heat insulation gap.

Preferably, the diameter of the first pushrod hole segment > the diameter of the second pushrod hole segment > the diameter of the third pushrod hole segment.

Preferably, a limiting surface is formed at the joint of the first push rod hole section and the second push rod hole section, and the first bushing section is abutted to the limiting surface along the axial direction.

Preferably, the outer peripheral surface of the liner is at least partially coated with a thermal barrier coating.

Preferably, the side wall of the first push rod hole is at least partially coated with a thermal barrier coating.

Preferably, the hole group further comprises a second push rod hole arranged on the cylinder cover body, and the exhaust passage, the first push rod hole, the bolt connection hole and the second push rod hole are sequentially arranged at intervals along the first direction.

Preferably, the number of the hole groups is plural, and the plural hole groups are spaced apart in the first direction.

Preferably, the cylinder head body is further provided with a cooling water channel.

The engine comprises the engine cylinder cover and further comprises a cylinder body, and bolts penetrate through the cylinder body and the bolt connecting holes and are in threaded connection with nuts.

The utility model has the beneficial effects that:

the utility model aims to provide an engine cylinder cover and an engine, wherein one side, close to an exhaust passage, of a first push rod hole is close to high-temperature gas in the exhaust passage, so that the engine cylinder cover is provided with a central axis of a bushing and a central axis of a first push rod, the central axis of the bushing is positioned between the central axis of the first push rod hole and the central axis of a bolt connecting hole along a first direction, the first push rod hole and the bushing are eccentrically arranged, so that a first heat insulation gap formed by the outer peripheral surface of the bushing and the side wall, close to the exhaust passage, of the first push rod hole is large enough, heat emitted by the high-temperature gas in the exhaust passage can be effectively isolated through the combined action of the first heat insulation gap and the bushing, the phenomenon of engine oil aging and/or carbonization in a push rod cavity of the first push rod is reduced, the lubricating property of the engine is improved, and the reliability of the engine is improved; and secondly, because the distance between one side of the first push rod hole far away from the exhaust passage and the high-temperature gas in the exhaust passage is far, the first push rod positioned in the part does not need to be insulated, so the outer peripheral surface of the bushing is attached to the side wall of the first push rod hole close to the bolt connecting hole or a second heat insulation gap is formed, the first heat insulation gap is larger than the second heat insulation gap, and the heat insulation space is reduced in a mode of attaching the outer peripheral surface of the bushing to the side wall of the first push rod hole close to the bolt connecting hole or in a mode of reducing the second heat insulation gap.

Drawings

FIG. 1 is a cross-sectional view of an engine cylinder head along a first perspective provided by an embodiment of the present utility model;

fig. 2 is a cross-sectional view of an engine cylinder head according to an embodiment of the present utility model taken from a second perspective.

In the figure:

1. a cylinder head body; 11. a set of holes; 111. an exhaust passage; 112. a first pushrod hole; 1121. a first pushrod bore segment; 1122. a third pushrod bore segment; 113. a bolt connection hole; 114. a second pushrod hole; 12. a cooling water channel;

2. a bushing; 21. a first liner segment; 22. a second liner segment; 23. a jack;

31. a first insulating gap; 32. and a second insulating gap.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

The utility model provides an engine cylinder head, as shown in fig. 1 and 2, the engine cylinder head comprises a cylinder head body 1 and a push rod assembly, the cylinder head body 1 is provided with a hole group 11, and the hole group 11 comprises an exhaust passage 111, a first push rod hole 112 and a bolt connecting hole 113 which are sequentially distributed on the cylinder head body 1 at intervals along a first direction; the push rod assembly comprises a bushing 2 fixedly inserted into the first push rod hole 112 and a first push rod which is slidably inserted into an insertion hole 23 of the bushing 2; the central axis of the bushing 2 and the central axis of the first push rod hole 112 are collinear, and along the first direction, the central axis of the bushing 2 is located between the central axis of the first push rod hole 112 and the central axis of the bolt connection hole 113, a first heat insulation gap 31 is formed between the outer peripheral surface of the bushing 2 and the side wall, close to the exhaust passage 111, of the first push rod hole 112, the outer peripheral surface of the bushing 2 is attached to the side wall, close to the bolt connection hole 113, of the first push rod hole 112 or a second heat insulation gap 32 is formed between the outer peripheral surface of the bushing 2 and the side wall, close to the bolt connection hole 113, of the first push rod hole 112, and the first heat insulation gap 31 is larger than the second heat insulation gap 32.

As shown in fig. 1 and 2, since the side of the first pushrod hole 112, which is close to the exhaust passage 111, is close to the high temperature gas in the exhaust passage 111, the central axis of the liner 2 is arranged on the cylinder head of the engine and is collinear with the central axis of the first pushrod, and the central axis of the liner 2 is positioned between the central axis of the first pushrod hole 112 and the central axis of the bolt connecting hole 113 along the first direction, it is understood that the first pushrod hole 112 is eccentrically arranged with the liner 2, so that the first heat insulation gap 31 formed between the outer circumferential surface of the liner 2 and the side wall of the first pushrod hole 112, which is close to the exhaust passage 111, is large enough, and the heat emitted by the high temperature gas in the exhaust passage 111 can be effectively isolated through the combined action of the first heat insulation gap 31 and the liner 2, so that the phenomenon of aging and/or carbonization of engine oil in the pushrod cavity of the first pushrod is reduced, and the lubrication performance of the engine is improved, and the reliability of the engine is improved. In addition, since the side of the first pushrod hole 112 far away from the exhaust passage 111 is far from the high-temperature gas in the exhaust passage 111, the first pushrod located in the part does not need to be insulated, so that the outer peripheral surface of the bushing 2 is attached to the side wall of the first pushrod hole 112 close to the bolt connection hole 113 or a second insulation gap 32 is formed, and the first insulation gap 31 is larger than the second insulation gap 32, and the insulation space is reduced by attaching the outer peripheral surface of the bushing 2 to the side wall of the first pushrod hole 112 close to the bolt connection hole 113 or reducing the second insulation gap 32, so that for the same engine model, the wall thickness of the exhaust passage 111 and the bolt connection hole 113 is distributed, the thickness between the side wall of the first pushrod hole 112 close to the bolt connection hole 113 and the side wall of the bolt connection hole 113 can be increased, and the bearing capacity of the side wall of the bolt connection hole 113 is improved, and the reliability of the engine is further improved. The ab direction is the first direction as shown in fig. 2. In the present embodiment, the first direction is the longitudinal direction of the cylinder head body 1.

As shown in fig. 1 and 2, the first push rod hole 112 includes a first push rod hole segment 1121, a second push rod hole segment and a third push rod hole segment 1122 that are sequentially communicated, the bushing 2 includes a first bushing segment 21 and a second bushing segment 22 that are connected, the first bushing segment 21 is inserted in the first push rod hole segment 1121 in an interference manner, the second bushing segment 22 is inserted in the second push rod hole segment in an interference manner and is inserted in the third push rod hole segment 1122 in an interference manner, a first heat insulation gap 31 is formed between an outer peripheral surface of the second bushing segment 22 and a side wall of the second push rod hole segment, which is close to the exhaust passage 111, and a second heat insulation gap 32 is formed between an outer peripheral surface of the second bushing segment 22 and a side wall of the second push rod hole segment, which is close to the bolt connection hole 113. The arrangement is such that the bushing 2 is fixedly connected to the first push rod hole 112, the first heat insulation gap 31 is formed on the side wall, close to the exhaust passage 111, of the bushing 2 and the first push rod hole 112, and the second heat insulation gap 32 is formed or attached on the side wall, close to the bolt connection hole 113, of the bushing 2 and the first push rod hole 112.

The second bushing segment 22 preferably engages the second pushrod bore segment adjacent the sidewall of the bolting bore 113. To further reduce the insulation space, the saved insulation space is allocated to the wall thickness of the exhaust duct 111 and the bolting hole 113. In the present embodiment, the second bush segment 22 and the second pushrod hole segment are attached to each other near the side wall of the bolting hole 113 by way of example only.

Specifically, in the present embodiment, as shown in fig. 1, the diameter of the first push rod hole segment 1121 > the diameter of the second push rod hole segment > the diameter of the third push rod hole segment 1122. It will be appreciated that the diameter of the first liner segment 21 > the diameter of the second liner segment 22.

Specifically, the junction of the first push rod hole segment 1121 and the second push rod hole segment forms a limiting surface, and the first bushing segment 21 axially abuts against the limiting surface. Thereby realizing the limitation of the bushing 2 along the axial direction of the first push rod hole 112.

Optionally, the outer circumferential surface of the liner 2 is at least partially coated with a thermal barrier coating. Thereby further improving the heat insulation effect. Specifically, in the present embodiment, at least a portion of the outer peripheral surface of the liner 2 near the exhaust passage 111 is coated with a thermal insulating coating.

Optionally, the sidewall of the first pushrod bore 112 is at least partially coated with a thermal barrier coating. Thereby further improving the heat insulation effect. Specifically, in the present embodiment, at least a portion of the side wall of the first pushrod hole 112 near the exhaust passage 111 is coated with a thermal insulation coating.

In the present embodiment, air is used as the heat insulating material filled in the first heat insulating gap 31, so that the processing difficulty can be reduced and the cost can be saved on the basis of ensuring the heat insulating effect. It is to be understood that the first heat insulating gap 31 may be filled with another kind of heat insulating material such as glass fiber for heat insulation.

Alternatively, as shown in fig. 1 and 2, the hole group 11 further includes a second pushrod hole 114 provided to the cylinder head body 1, and the exhaust passage 111, the first pushrod hole 112, the bolting hole 113, and the second pushrod hole 114 are sequentially provided at intervals in the first direction. It will be appreciated that second pushrod holes 114 are remote from exhaust passageway 111 relative to first pushrod holes 112, and therefore do not require insulation. Specifically, the second pushrod hole 114 is slidably provided with a second pushrod.

Alternatively, as shown in fig. 2, the number of the hole groups 11 is plural, and the plural hole groups 11 are spaced apart in the first direction. It can be understood that the engine cylinder head is suitable for both single cylinder engines and multi-cylinder engines, and is provided with a group of hole groups 11 when the engine cylinder head is used for the single cylinder engines, and is provided with a plurality of groups of hole groups 11 when the engine cylinder head is used for the multi-cylinder engines, so that the universality is strong.

As shown in fig. 1 and 2, the cylinder head body 1 is further provided with a cooling water passage 12. The cooling water channel 12 is used for circulating cooling liquid to cool parts in the engine cylinder.

The utility model also provides an engine, which comprises the engine cylinder cover and a cylinder body, wherein bolts penetrate through the cylinder body and the bolt connecting holes 113 and are in threaded connection with nuts. By adopting the engine cylinder cover, the heat emitted by the high-temperature gas in the exhaust passage 111 can be effectively isolated, the phenomenon of aging and/or carbonization of engine oil in a push rod cavity of the first push rod 112 is reduced, and the lubricating performance of the engine is improved; the exhaust passage 111 can be increased to enable the exhaust to be unobstructed, and the thickness between the side wall, close to the bolt connection hole 113, of the first push rod hole 112 and the side wall of the bolt connection hole 113 can be increased, so that the bearing capacity of the side wall of the bolt connection hole 113 is improved, and the reliability of the engine is improved.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. An engine cylinder head, comprising:

the cylinder cover comprises a cylinder cover body (1), wherein the cylinder cover body (1) is provided with a hole group (11), and the hole group (11) comprises exhaust passages (111), first push rod holes (112) and bolt connecting holes (113) which are sequentially distributed on the cylinder cover body (1) at intervals along a first direction;

the push rod assembly comprises a bushing (2) fixedly inserted into the first push rod hole (112) and a first push rod which is slidably inserted into an insertion hole (23) of the bushing (2);

the central axis of bush (2) with the central axis of first push rod is collinear, and follows the first direction, the central axis of bush (2) is located the central axis of first push rod hole (112) with the central axis of bolted connection hole (113), the outer peripheral face of bush (2) with be close to on first push rod hole (112) the lateral wall of exhaust passage (111) forms first thermal insulation clearance (31), the outer peripheral face of bush (2) with be close to on first push rod hole (112) the lateral wall laminating of bolted connection hole (113) or form second thermal insulation clearance (32), first thermal insulation clearance (31) are greater than second thermal insulation clearance (32).

2. The engine cylinder head of claim 1, wherein the first pushrod hole (112) includes a first pushrod hole segment (1121), a second pushrod hole segment, and a third pushrod hole segment (1122) that are sequentially communicated, the liner (2) includes a first liner segment (21) and a second liner segment (22) that are connected, the first liner segment (21) is inserted in the first pushrod hole segment (1121) in an interference manner, the second liner segment (22) is inserted in the second pushrod hole segment in an interference manner in the third pushrod hole segment (1122), an outer peripheral surface of the second liner segment (22) forms the first thermal insulation gap (31) with a side wall of the second pushrod hole segment, which is adjacent to the exhaust passage (111), and an outer peripheral surface of the second liner segment (22) conforms to a side wall of the second pushrod hole segment, which is adjacent to the bolt connection hole (113), or forms the second thermal insulation gap (32).

3. The engine cylinder head of claim 2, wherein the diameter of the first pushrod bore segment (1121) is greater than the diameter of the second pushrod bore segment is greater than the diameter of the third pushrod bore segment (1122).

4. The engine cylinder head of claim 2, wherein the junction of the first pushrod bore segment (1121) and the second pushrod bore segment forms a stop surface against which the first liner segment (21) axially abuts.

5. The engine cylinder head according to any one of claims 1 to 4, characterized in that the outer peripheral surface of the liner (2) is at least partially coated with a heat-insulating coating.

6. The engine cylinder head according to any one of claims 1-4, characterized in that a side wall of the first pushrod hole (112) is at least partially coated with a thermal barrier coating.

7. The engine cylinder head according to any one of claims 1 to 4, wherein the hole group (11) further includes a second pushrod hole (114) provided to the cylinder head body (1), and the exhaust passage (111), the first pushrod hole (112), the bolting hole (113), and the second pushrod hole (114) are provided at a sequential interval in the first direction.

8. The engine cylinder head according to any one of claims 1 to 4, wherein the number of the hole groups (11) is plural, and a plurality of the hole groups (11) are spaced apart in the first direction.

9. The engine cylinder head according to any one of claims 1-4, characterized in that the cylinder head body (1) is further provided with cooling water channels (12).

10. An engine comprising the engine cylinder head of any one of claims 1 to 9, further comprising a cylinder block, and bolts passing through the cylinder block and the bolt connection holes (113) and screwed with nuts.

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