CN210370823U

CN210370823U - Camshaft support structure of air-cooled diesel engine

Info

Publication number: CN210370823U
Application number: CN201921003698.7U
Authority: CN
Inventors: 周瑜
Original assignee: Changzhou Xiake Power Machinery Co ltd
Current assignee: Changzhou Xiake Power Machinery Co ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-04-21
Anticipated expiration: 2029-06-28

Abstract

The utility model belongs to the technical field of the diesel engine technique and specifically relates to an air-cooled diesel engine camshaft bearing structure, install the side cap on the organism, be provided with the camshaft in the cavity that organism and side cap formed, the rotatory setting of camshaft one end is on the organism, the other end is rotatory to be set up on the side cap, organism and camshaft support section department cover are equipped with the bush, the oil storage tank has been seted up on the internal surface of bush, replace original needle roller bearing with the bush, become sliding friction by rolling friction, the bush adopts the metallurgical system of grinding to make, the bush does not have hardness, this bush organizational structure is porous, semi-compact, can oil storage in the bush, be equivalent to an oil bearing, do not have hardness, wear resistance is good, form the oil film between bush and the camshaft, so the camshaft can not wear, be the face contact between camshaft and the bush simultaneously.

Description

Camshaft support structure of air-cooled diesel engine

Technical Field

The utility model belongs to the technical field of the diesel engine technique and specifically relates to an air-cooled diesel engine camshaft bearing structure.

Background

The camshaft is a component in a piston engine. Its function is to control the opening and closing action of the valve. Although the rotational speed of the camshaft is half of that of the crankshaft in a four-stroke engine (the rotational speed of the camshaft is the same as that of the crankshaft in a two-stroke engine), the rotational speed is still high and the camshaft is subjected to a large torque, so that the camshaft is required to be high in strength and support in design, and the camshaft is generally made of high-quality alloy steel or alloy steel.

The rotating speed of the existing air-cooled diesel engine is 3000-3600 rpm, a needle bearing is sleeved on a journal of a camshaft in the air-cooled diesel engine, the camshaft is in rolling friction in the engine body, the bearing hardness of the needle bearing is HRC 58-63, but the surface hardness of the camshaft is only HRC 43-48, and a hardness difference is generated between the camshaft and the bearing, so that the camshaft is easy to wear, the wear loss is more than 0.1mm, and after the wear loss exceeds 0.1mm, the camshaft and the needle bearing are shaken after being worn, and the power and the service life of the diesel engine are influenced.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the defects in the prior art are overcome, and the camshaft supporting structure of the air-cooled diesel engine, which has no hardness, good wear resistance, oil film formed between the bushing and the camshaft and no abrasion of the camshaft, is provided.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides an air-cooled diesel engine camshaft bearing structure, includes the organism, installs the side cap on the organism, is provided with the camshaft in the cavity that organism and side cap formed, and the rotatory setting of camshaft one end is on the organism, and the other end is rotatory to be set up on the side cap, and organism and camshaft support section department cover are equipped with the bush, have seted up the oil storage tank on the internal surface of bush.

Furthermore, the lining is made of powder metallurgy materials, the friction coefficient between the surfaces of the powder metallurgy materials is small, and the lining has long service life and high reliability under the condition of limited lubricating oil; under the condition of dry friction, the self-lubricating effect is realized by virtue of the lubricant contained in the self-lubricating oil or the surface layer. The powder metallurgy material is a porous sintering material, the pore channels in the material are criss-cross and mutually communicated, the volume porosity of the material is generally 30-60%, the pore diameter is 1-100 micrometers, and the material can work under the condition of friction and abrasion, and the ductility and the impact value of the material are lower than those of a casting and forging piece with the same chemical composition due to the existence of residual pores in the material, so that the application range of the material is limited.

The utility model has the advantages that: the utility model discloses with the original needle bearing of bush replacement, become sliding friction by rolling friction, the bush adopts the grinding metallurgy to make, and the bush does not have the hardness, and this bush organizational structure is porous, semi-fine and close, can oil storage in the bush, is equivalent to an oil-retaining bearing, does not have hardness, wear resistance good, forms the oil film between bush and the camshaft, so the camshaft can not wear and tear, is the face contact between camshaft and the bush simultaneously, and contact stress reduces, and increase area of contact is big.

Drawings

The present invention will be further described with reference to the accompanying drawings and embodiments.

Fig. 1 is a front view of the present invention;

fig. 2 is a left side view of the present invention;

fig. 3 is an assembly view of the camshaft and the machine body of the present invention.

In the figure, 1 is a machine body, 2 is a camshaft, 3 is a lining, 4 is an oil storage tank, and 5 is a side cover.

Detailed Description

The invention will now be further described with reference to the accompanying drawings. The drawings are simplified schematic diagrams only illustrating the basic structure of the present invention in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 1-3, an air-cooled diesel engine camshaft bearing structure, including organism 1, install side cap 5 on the organism 1, be provided with camshaft 2 in the cavity that organism 1 and side cap 5 formed, 2 one ends of camshaft are rotatory to be set up on organism 1, and the other end is rotatory to be set up on side cap 5, and organism 1 and 2 support sections department covers and is equipped with bush 3, has seted up oil storage tank 4 on the internal surface of bush 3.

The lining 3 is made of powder metallurgy material.

The specific original needle bearing of 3 replacement bushings that will be become of rolling friction, become sliding friction by rolling friction, bushing 3 adopts the grinding metallurgy to make, be equipped with camshaft 2 in the organism 1, camshaft 2 overlaps with the junction of organism 1 has bush 3, prevent to produce the friction between camshaft 2 and the organism 1, bush 3 does not have the hardness, this bush organizational structure is porous, semi-compact, can oil storage in the bush 3, be equivalent to an oil-retaining bearing, do not have hardness, wear resistance is good, form the oil film between bush and the camshaft, so the camshaft can not wear, be surface contact between camshaft and the bush simultaneously, contact stress reduces, increase area of contact is big.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose thereof is to enable people skilled in the art to understand the contents of the present invention and implement the present invention, and the protection scope of the present invention can not be limited thereby, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A forced air cooling diesel engine camshaft bearing structure which characterized in that: including organism (1), install side cap (5) on organism (1), be provided with camshaft (2) in the cavity that organism (1) and side cap (5) formed, camshaft (2) one end is rotatory to be set up on organism (1), and the other end is rotatory to be set up on side cap (5), and organism (1) and camshaft (2) support section department cover are equipped with bush (3), have seted up oil storage tank (4) on the internal surface of bush (3).

2. The camshaft support structure of an air-cooled diesel engine according to claim 1, wherein: the lining (3) is made of powder metallurgy materials.