CN219281837U

CN219281837U - Engine and vehicle

Info

Publication number: CN219281837U
Application number: CN202320377322.2U
Authority: CN
Inventors: 任伟; 叶伟; 刘强; 薛峰宗
Original assignee: BAIC Motor Powertrain Co Ltd
Current assignee: BAIC Motor Powertrain Co Ltd
Priority date: 2023-03-02
Filing date: 2023-03-02
Publication date: 2023-06-30
Anticipated expiration: 2033-03-02

Abstract

The embodiment of the application provides an engine and a vehicle, wherein the engine comprises a cylinder, a crankshaft and an antifriction sleeve; the cylinder comprises a cylinder body and a main bearing cover arranged on the cylinder body, the cylinder body and the main bearing cover are matched to form a first through hole, the antifriction sleeve is provided with a limiting structure, and the antifriction sleeve is fixed in the first through hole through the limiting structure; the crankshaft is arranged in the first through hole through the antifriction sleeve. By arranging the antifriction sleeve, the crankshaft is arranged on the cylinder through the antifriction sleeve, and compared with the prior art, the assembly precision is high due to the fact that the bearing bush is arranged in the main bearing hole formed by the cylinder body and the main bearing cap.

Description

Engine and vehicle

Technical Field

The present application relates to the field of vehicles, and more particularly to an engine and a vehicle.

Background

The main function of the engine crankshaft is to convert the reciprocating motion of the piston into rotary motion through a connecting rod, output torque outwards and drive other accessories such as a valve mechanism, an oil pump, a generator, a water pump and the like of the engine.

At present, the technical route of crankshaft support mainly comprises: the main bearing holes are formed by the cylinder body and the main bearing cover, and the cylinder body and the main bearing cover are respectively cast due to different materials, are fixed through main bearing cover bolts and are combined for machining after rough machining, and a main bearing bush upper bush and a main bearing bush lower bush are arranged between a main bearing journal of a crankshaft and the main bearing holes so as to improve the tribological performance of the main bearing journal of the crankshaft. The assembly accuracy is low due to the manufacturing tolerances of the bearing shell itself.

Disclosure of Invention

The embodiment of the application provides an engine and a vehicle, which can solve the problem of low assembly precision of a crankshaft in the related art.

In order to solve the technical problems, the application is realized as follows:

in a first aspect, embodiments of the present application provide an engine comprising a cylinder, a crankshaft, and an antifriction sleeve;

the cylinder comprises a cylinder body and a main bearing cover arranged on the cylinder body, the cylinder body and the main bearing cover are matched to form a first through hole, the antifriction sleeve is provided with a limiting structure, and the antifriction sleeve is fixed in the first through hole through the limiting structure;

the crankshaft is arranged in the first through hole through the antifriction sleeve.

Optionally, the cylinder body has a first groove, the main bearing cap has a second groove, and the first groove and the second groove are disposed opposite to each other to form the first through hole.

Optionally, the antifriction sleeve is provided with a second through hole, and the crankshaft passes through the second through hole to be connected with the main bearing cover.

Optionally, the antifriction sleeve comprises a first sub-sleeve body and a second sub-sleeve body, the first sub-sleeve body is provided with a third groove, the second sub-sleeve body is provided with a fourth groove, and the third groove and the fourth groove are oppositely arranged to form the second through hole.

Optionally, the center line of the second through hole and the center line of the first through hole coincide.

Optionally, the hole wall of the first through hole is provided with a first sawtooth structure, the limiting structure is a second sawtooth structure arranged towards the direction of the hole wall of the first through hole, and the first sawtooth structure is matched with the second sawtooth structure.

Optionally, the cylinder further comprises a fixing for fixing the main bearing cap to the block.

Optionally, the antifriction sleeve is made of a low-carbon steel material.

Optionally, a protective layer is disposed on a side of the antifriction sleeve facing the crankshaft, and the protective layer is formed by spraying at least one of babbitt alloy or copper-based bearing bush alloy.

In a second aspect, embodiments of the present application provide a vehicle including the engine described above.

In the technical scheme provided by the embodiment of the application, the engine comprises a cylinder, a crankshaft and an antifriction sleeve; the cylinder comprises a cylinder body and a main bearing cover arranged on the cylinder body, the cylinder body and the main bearing cover are matched to form a first through hole, the antifriction sleeve is provided with a limiting structure, and the antifriction sleeve is fixed in the first through hole through the limiting structure 21; the crankshaft is arranged in the first through hole through the antifriction sleeve. By arranging the antifriction sleeve, the crankshaft is arranged on the cylinder through the antifriction sleeve, and compared with the prior art, the assembly precision is high due to the fact that the bearing bush is arranged in the main bearing hole formed by the cylinder body and the main bearing cap.

Drawings

FIG. 1 is a schematic view of a cylinder block and main bearing cap of the related art;

fig. 2 is a schematic structural diagram of an engine according to an embodiment of the present disclosure;

fig. 3 is a schematic structural view of an antifriction sleeve according to an embodiment of the present application.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Unless defined otherwise, technical or scientific terms used herein should be given the ordinary meaning as understood by one of ordinary skill in the art to which this application belongs. The terms "first," "second," and the like, as used herein, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. Likewise, the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate a relative positional relationship, which changes accordingly when the absolute position of the object to be described changes.

Referring to fig. 1, fig. 1 is a schematic structural diagram of a cylinder and a bearing cap in the related art. As shown in the figure, a bearing bush is arranged between the cylinder body and the bearing cover, and in a high-speed internal combustion engine, the relative sliding friction speed between the bearing bush and a journal can reach more than 10 m/s. At such high speeds, a significant amount of frictional heat is generated, raising the working surface temperature of the spindle shoe to about 150 ℃. If sufficient oil passes over the friction surfaces, it is possible, in addition to cooling the bearing shell, to put the bearing shell in a completely liquid friction state, i.e. the bearing shell and the journal friction surfaces are completely separated by an oil film and are not in direct contact.

Because of errors in manufacturing the cylinder body, the crankshaft and the main bearing bush, in order to improve the assembly consistency, the upper bush of the main bearing bush and the lower bush of the main bearing bush are generally selected in groups according to the diameter of the crankshaft and the aperture of the main bearing hole, and the thicknesses are often different. The above factors cause local load concentration (edge load and the like) between the journal and the main bearing bush, and once a boundary oil film is broken, metal materials can be in direct contact, solid (dry) friction occurs, strong abrasion is caused, even surface melting is caused, and the normal work of the bearing bush is affected by mutual biting and sticking. Meanwhile, the gap value between the crankshaft and the main shaft bush also directly influences the acoustic quality of the whole vehicle.

Referring to fig. 2, fig. 2 is a schematic diagram of an engine according to an embodiment of the present application, where the engine includes a cylinder 10, a crankshaft, and an antifriction sleeve 20;

the cylinder 10 comprises a cylinder body and a main bearing cover arranged on the cylinder body, the cylinder body and the main bearing cover are matched to form a first through hole, the antifriction sleeve 20 is provided with a limiting structure 21, and the antifriction sleeve 20 is fixed in the first through hole through the limiting structure 21;

the crankshaft is disposed in the first through hole by the antifriction sleeve 20.

It should be appreciated that the cylinder block is cast integrally with the bearing cap and that during the casting process, the antifriction sleeve 20 is inlaid. In particular embodiments, the antifriction sleeve 20 may be made of a low carbon steel material. The antifriction sleeve 20 is provided with a protective layer on a side facing the crankshaft, the protective layer being spray-formed of at least one of babbitt or copper-based bearing bush alloy.

In the technical scheme provided by the embodiment of the application, the engine comprises a cylinder 10, a crankshaft and an antifriction sleeve 20; the cylinder 10 comprises a cylinder body and a main bearing cover arranged on the cylinder body, the cylinder body and the main bearing cover are matched to form a first through hole, the antifriction sleeve 20 is provided with a limiting structure 21, and the antifriction sleeve 20 is fixed in the first through hole through the limiting structure 21; the crankshaft is disposed in the first through hole by the antifriction sleeve 20. By arranging the antifriction sleeve 20, the crankshaft is mounted on the cylinder 10 through the antifriction sleeve 20, and compared with the prior art, the assembly precision is high because the bearing bush is arranged in the main bearing hole formed by the cylinder body and the main bearing cap.

Optionally, the antifriction sleeve 20 has a second through bore 22, and the crankshaft is connected to the main bearing cap through the second through bore 22.

It should be appreciated that the second through bore 22 is adapted to the crankshaft which rotates within the antifriction sleeve 20 during engine operation.

Optionally, the antifriction sleeve 20 includes a first sub-sleeve body and a second sub-sleeve body, the first sub-sleeve body has a third groove, the second sub-sleeve body has a fourth groove, and the third groove and the fourth groove are disposed opposite to each other to form the second through hole 22.

It should be appreciated that the first sub-sleeve is disposed in the first recess, the second sub-sleeve is disposed in the second recess, and the first sub-sleeve and the second sub-sleeve cooperate to form the second through hole 22, and the crankshaft is connected to the cylinder 10 through the second through hole 22.

Optionally, the center line of the second through hole 22 and the center line of the first through hole coincide.

In this embodiment, the center lines of the second through hole 22 and the first through hole are overlapped, so that the accuracy of the motion track of the crankshaft is improved.

Optionally, as shown in fig. 3, the hole wall of the first through hole has a first saw-tooth structure, the limiting structure 21 is a second saw-tooth structure disposed towards the direction of the hole wall of the first through hole, and the first saw-tooth structure is adapted to the second saw-tooth structure.

In this embodiment, the second saw tooth structure is arranged on the antifriction sleeve 20 towards the direction of the first through hole wall, and the second saw tooth structure is matched with the first saw tooth structure of the first through hole wall, so as to improve the connection stability among the antifriction sleeve 20, the cylinder body and the main bearing cap.

In an alternative embodiment, the groove depth H of the second saw tooth structure may be set to be 1.4-1.6, the groove bottom width L1 to be 0.9-1.1, the groove spacing L2 to be 3.8-4.2, and the opening angle θ to be 35 ° to 36 °.

Optionally, the cylinder 10 further comprises a fixing for fixing the main bearing cap to the block.

In a specific implementation, the fixing piece can be a bolt, screw holes matched with the bolt are formed in the cylinder body and the main bearing cover, and the bolt passes through the screw holes so that the main bearing cover is fixed on the cylinder body.

In the embodiment of the application, after the main bearing hole is machined, the supporting component is cracked to form the cylinder body and the cylinder bearing cover, in the assembly process, the crankshaft is firstly disassembled and installed on the cylinder bearing cover, and then the cylinder bearing cover is assembled again and screwed by the bearing cover bolt.

The embodiment of the application also provides a vehicle comprising the engine. Because the technical solution of the present embodiment includes all the technical solutions of the foregoing embodiments, at least all the technical effects of the foregoing embodiments can be achieved, which is not described herein in detail.

The embodiments of the present application have been described in connection with the accompanying drawings, but the present application is not limited to the above-described embodiments, which are intended to be illustrative only and not limiting, and many forms can be made by those of ordinary skill in the art without departing from the spirit of the present application and the scope of the claims, which are to be protected by the present application.

Claims

1. An engine is characterized by comprising a cylinder, a crankshaft and an antifriction sleeve;

2. The engine of claim 1, wherein the cylinder block has a first recess and the main bearing cap has a second recess, the first recess and the second recess being disposed opposite one another forming the first through bore.

3. The engine of claim 1, wherein the antifriction sleeve has a second through bore through which the crankshaft is connected to the cylinder.

4. The engine of claim 3, wherein the antifriction sleeve comprises a first sub-sleeve body and a second sub-sleeve body, the first sub-sleeve body having a third groove and the second sub-sleeve body having a fourth groove, the third groove and the fourth groove being disposed opposite one another to form the second through hole.

5. The engine of claim 4, wherein a centerline of the second through hole and a centerline of the first through hole coincide.

6. The engine of claim 1, wherein the wall of the first through hole has a first saw-tooth structure, the limiting structure is a second saw-tooth structure arranged towards the wall of the first through hole, and the first saw-tooth structure is matched with the second saw-tooth structure.

7. The engine of claim 2, wherein the cylinder further comprises a mount for securing the main bearing cap to the block.

8. The engine of claim 1, wherein the antifriction sleeve is made of a low carbon steel material.

9. The engine of claim 1, wherein a side of the antifriction sleeve facing the crankshaft is provided with a protective layer formed by spraying at least one of a babbitt or a copper-based bearing bush alloy.

10. A vehicle comprising an engine as claimed in any one of claims 1 to 9.