CN213980906U

CN213980906U - Sectional type rocking arm shaft's camshaft bearing cap lubricating structure

Info

Publication number: CN213980906U
Application number: CN202022745834.9U
Authority: CN
Inventors: 陈彪; 张雷; 朱杰; 叶洁; 罗韩佗; 吴定勇
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-11-24
Filing date: 2020-11-24
Publication date: 2021-08-17
Anticipated expiration: 2030-11-24

Abstract

The utility model discloses a camshaft bearing cap lubricating structure of sectional type rocking arm axle relates to engine technical field, including middle camshaft bearing cap, middle camshaft bearing cap back plane is provided with the camshaft mounting hole, be provided with camshaft bearing UNICOM oil duct on the pore wall of camshaft mounting hole, be provided with the camshaft axle bush in the camshaft mounting hole, be provided with camshaft lubrication groove on the camshaft axle bush inner wall, be provided with camshaft axle bush inlet port in the camshaft lubrication groove, camshaft axle bush inlet port is linked together with camshaft bearing UNICOM oil duct. The utility model discloses get oil from the front and back rocking arm axle oil duct to through camshaft axle bush inlet port on the camshaft axle bush, finally get into camshaft lubrication groove, thereby for the camshaft axle journal in the operation in-process continuous stable oil supply lubrication, reduce camshaft wearing and tearing risk, improve camshaft operational reliability.

Description

Sectional type rocking arm shaft's camshaft bearing cap lubricating structure

Technical Field

The utility model relates to the technical field of engines, especially a camshaft bearing cap lubricating structure of sectional type rocking arm axle.

Background

The camshaft, as an important component in the engine, functions to control the opening and closing of the valves. The main body of the camshaft is a cylindrical rod of approximately the same length as the cylinder bank. The upper surface is sleeved with a plurality of cams for driving the air valves. The camshaft is supported in the camshaft bearing hole through the camshaft journals, so the number of the camshaft journals is an important factor influencing the supporting rigidity of the camshaft. If the rigidity of the camshaft is insufficient, the camshaft can be bent and deformed during working, and the timing of gas distribution is influenced. The thrust gear camshaft bearing is formed by installing a camshaft bearing cover on an engine cylinder cover or a camshaft bearing seat of an overhead camshaft structure, and has the main functions of: the bearing thrust end face of the camshaft is matched with the camshaft thrust shoulder to prevent the camshaft from axially moving.

At present, the camshaft and the camshaft bearing move relatively, and in order to prevent dry friction and improve reliability, enough lubricating oil needs to be provided for lubrication. The traditional camshaft bearing thrust surface has no active lubricating oil circuit, and usually depends on oil mist in the top surface space of the cylinder head to provide lubrication, so that the supply of lubricating oil is insufficient and uneven, and the lubricating effect is poor.

SUMMERY OF THE UTILITY MODEL

Problem to prior art existence, the utility model provides a sectional type rocking arm shaft's camshaft bearing cap lubricating structure, the purpose is solved current camshaft bearing thrust surface and does not have the initiative lubrication oil circuit, relies on the oil mist of cylinder head top surface space in order to provide the lubrication usually, leads to the not enough and inhomogeneous of lubricated oil mass supply, problem that lubricated effect is poor.

In order to achieve the purpose, the technical scheme of the utility model is as follows:

a camshaft bearing cover lubricating structure of a sectional rocker arm shaft comprises a middle camshaft bearing cover, wherein a camshaft mounting hole is formed in the rear plane of the middle camshaft bearing cover, a camshaft bearing communicating oil duct is formed in the wall of the camshaft mounting hole, a camshaft bearing bush is arranged in the camshaft mounting hole, a camshaft lubricating oil groove is formed in the inner wall of the camshaft bearing bush, a camshaft bearing bush oil inlet hole is formed in the camshaft lubricating oil groove, and the camshaft bearing bush oil inlet hole is communicated with the camshaft bearing communicating oil duct;

a rocker shaft mounting hole is formed in the front plane of the middle camshaft bearing cover, a front end oil groove and a rear end oil groove are formed in the hole wall of the rocker shaft mounting hole, a front end oil inlet channel is formed in one end of the front end oil groove, a front end oil passing bolt hole is formed in the other end of the front end oil groove, a front end oil passing bolt hole is formed in the front end oil passing bolt hole, and the front end oil passing bolt hole is communicated with an camshaft bearing communicating oil channel on the hole wall of the camshaft mounting hole; and a rear-end oil inlet channel is arranged at one end in the rear-end oil groove, a rear-end oil passing bolt hole is arranged at the other end of the rear-end oil groove, and a rear-end oil passing channel is arranged in the rear-end oil passing bolt hole and is communicated with the oil channel communicated with the camshaft bearing on the hole wall of the camshaft mounting hole.

Preferably, the front end oil groove and the rear end oil groove are arranged in a splayed manner. Therefore, the contact surfaces of the front-end oil groove and the rear-end oil groove with the rocker shaft are more, and more lubrication is realized.

The utility model has the advantages that:

the utility model provides a pair of sectional type rocking arm shaft's camshaft bearing cap lubricating structure gets oil from the rocking arm shaft oil duct to through camshaft axle bush inlet port on the camshaft axle bush, finally get into camshaft lubrication groove, thereby it is lubricated at the continuous stable oil supply of operation in-process for the camshaft axle journal, reduce camshaft wearing and tearing risk, improve camshaft operational reliability.

Drawings

Fig. 1 is a front view of a lubricating structure of a camshaft bearing cap of a sectional type rocker shaft according to an embodiment of the present invention;

FIG. 2 is a sectional view taken along line F-F of FIG. 1;

FIG. 3 is a view taken from FIG. 2 after clockwise rotation of the section taken from H-H;

fig. 4 is a rear view of a camshaft bearing cap lubricating structure of a sectional type rocker shaft according to an embodiment of the present invention;

fig. 5 is a mounting position diagram of a camshaft bearing cap lubricating structure of a sectional type rocker shaft on a cylinder head according to an embodiment of the present invention;

fig. 6 is a diagram of a lubricating structure of a camshaft bearing cover of a sectional rocker shaft after the rocker shaft is installed according to an embodiment of the present invention;

FIG. 7 is a sectional view taken along line A-A of FIG. 6;

in the figures, 1-cylinder head; 2-intermediate camshaft bearing caps; 3-camshaft bearing; 4-an oil duct is arranged on the cylinder cover; 5-oil duct is arranged on the front cam shaft bearing cover; 6-front rocker arm shaft oil duct; 7-a rocker shaft oil passage at the front end; 8-a rear end rocker shaft oil passage; 9-rear rocker arm shaft oil duct; 10-oil duct is arranged on the bearing cover of the rear camshaft; 11-front camshaft bearing caps; 12-rear camshaft bearing caps; 13-a front rocker shaft; 14-rear rocker shaft; 15-oil passing bolt holes of the rocker shaft at the front end; 16-oil passing bolt holes of the rocker shaft at the rear end; 17-front end oil inlet channel; 18-a rear oil inlet channel; 19-front oil groove; 20-a rear oil groove; 21-oil passing bolt holes at the front ends; 22-rear oil-passing bolt holes; 23-camshaft bearing cap communicating oil duct; 24-rocker shaft mounting holes; 25-camshaft mounting holes; 26-camshaft lubrication grooves; 27-camshaft bearing bush oil inlet; 28-oil passage at the front end; 29-rear end oil passage.

Detailed Description

In order to explain the technical content, the achieved objects and the effects of the present invention in detail, the following description is made in conjunction with the embodiments and the accompanying drawings.

Example 1

Referring to fig. 1 to 7, the utility model provides a camshaft bearing cap lubricating structure of sectional type rocking arm shaft, including middle camshaft bearing cap 2, the rear plane of middle camshaft bearing cap 2 is provided with camshaft mounting hole 25, be provided with camshaft bearing UNICOM oil duct 23 on the pore wall of camshaft mounting hole 25, be provided with the camshaft bearing 3 rather than the inner wall adaptation in camshaft mounting hole 25, be provided with camshaft lubrication oil groove 26 on the inner wall of camshaft bearing 3, be provided with camshaft bearing oil inlet 27 in the camshaft lubrication groove 26, camshaft bearing oil inlet 27 is linked together with camshaft bearing UNICOM oil duct 23;

a rocker arm shaft mounting hole 24 is formed in the front plane of the middle camshaft bearing cover 2, a front end oil groove 19 and a rear end oil groove 20 are formed in the hole wall of the rocker arm shaft mounting hole 24, a front end oil inlet channel 17 is formed in the front end oil groove 19, a front end oil passing bolt hole 21 is further formed in the front end oil passing bolt hole 19, a front end oil passing channel 28 is formed in the front end oil passing bolt hole 21, and the front end oil passing bolt hole is communicated with a camshaft bearing communicating oil channel 23 on the hole wall of the camshaft mounting hole 25; a rear-end oil inlet channel 18 is arranged at one end in the rear-end oil groove, a rear-end bolt passing hole 22 is arranged at the other end of the rear-end oil groove, and a rear-end oil passing channel 29 is arranged in the rear-end bolt passing hole 22 and communicated with an oil channel 23 communicated with a camshaft bearing on the hole wall of the camshaft mounting hole 25.

As shown in fig. 6 and 7, a front rocker shaft 13 and a rear rocker shaft 14 are arranged on a cylinder head 1, the front rocker shaft 13 is mounted on a front camshaft bearing cover 11 and a middle camshaft bearing cover 2, the rear rocker shaft 14 is mounted on a rear camshaft bearing cover 12 and a middle camshaft bearing cover 2, one end of each of the front rocker shaft 13 and the rear rocker shaft 14 is mounted on the middle camshaft bearing cover 2, the front rocker shaft 13 and the rear rocker shaft 14 are coaxially arranged, a front rocker shaft oil passage 6 is axially arranged in the front rocker shaft 13, the front rocker shaft oil passage 6 penetrates out of the front rocker shaft 13, a front rocker shaft oil passage 15 is formed on the outer wall of the front rocker shaft 13 opposite to a front end oil groove 19 on a rocker shaft mounting hole 24, a rear rocker shaft oil passage 9 is axially arranged in the rear rocker shaft 14, the rear rocker shaft oil passage 9 penetrates out of the rear rocker shaft 14, a rear rocker shaft oil passing bolt hole 16 is formed on the outer wall of the rear rocker shaft 14 opposite to the rear oil groove 20 on the rocker shaft mounting hole 24; the front camshaft bearing cover 11 is internally provided with a front camshaft bearing cover upper oil duct 5, and the rear camshaft bearing cover 12 is internally provided with a rear camshaft bearing cover upper oil duct 10; the cylinder cover 1 is provided with a cylinder cover upper oil passage 4 which is respectively communicated with a front camshaft bearing cover upper oil passage 5 and a rear camshaft bearing cover upper oil passage 10, the front camshaft bearing cover upper oil passage 5 is communicated with a front rocker shaft oil passage 6, and the rear camshaft bearing cover upper oil passage 10 is communicated with a rear end rocker shaft oil passage 9;

when the structure works, the flow path of the lubricating oil is as follows: the lubricating oil is divided into two paths through an upper oil passage 4 of the cylinder cover and respectively enters an upper oil passage 5 of the front camshaft bearing cover and an upper oil passage 10 of the rear camshaft bearing cover, wherein one path enters an oil passage 6 of the front rocker shaft through the upper oil passage 5 of the front camshaft bearing cover, then passes through an oil passage 7 of the front rocker shaft, flows into an oil groove 19 of the front end through an oil passing bolt hole 15 of the front rocker shaft, then passes through an oil passage 28 of the front end oil passing bolt hole 21 and flows into a communicating oil passage 23 of the camshaft bearing cover; the other route of lubricating oil flows into a rear rocker shaft oil passage 9 from a camshaft bearing cover upper oil passage 10, then flows into a rear end oil groove 20 through a rear rocker shaft oil passing bolt hole 16 after passing through a rear rocker shaft oil passing passage 8, then flows into a rear end oil passing passage 29 through a rear end oil passing bolt hole 22, and finally enters a camshaft bearing cover communicating oil passage 23; it can be seen that the two paths of lubricating oil finally join in the camshaft bearing cap communicating oil duct 23 on the wall of the camshaft mounting hole 25, and then the lubricating oil in the camshaft bearing cap communicating oil duct 23 flows into the camshaft lubricating oil groove 26 through the camshaft bearing bush oil inlet 27 to lubricate the camshaft.

From the above, the front rocker shaft 13 and the rear rocker shaft 14 both serve as oil ducts of the middle camshaft bearing cover 2 for conveying lubricating oil, and the oil ducts of the front rocker shaft 13 and the rear rocker shaft 14 are communicated in the camshaft bearing cover communicated oil duct 23 to serve as a pressure stabilizing cavity, so that continuous and stable oil supply and lubrication of a camshaft journal in the operation process are ensured, the reliability is improved, and the wear risk of the camshaft is reduced.

Example 2

The other parts of this embodiment are the same as those of embodiment 1, wherein the different parts are that the front end oil groove and the rear end oil groove are arranged in a splayed shape. Therefore, the contact surfaces of the front-end oil groove and the rear-end oil groove with the rocker shaft are more, and more lubrication is realized.

It is understood that the mounting of only the front camshaft bearing cap 11 and the middle camshaft bearing cap 2 on the front rocker shaft 13 is not limited, and in other embodiments, more than one camshaft bearing cap may be mounted on the front rocker shaft 13 between the front camshaft bearing cap 11 and the middle camshaft bearing cap 2;

similarly, the rear rocker arm shaft 14 is not limited to mounting only the rear camshaft bearing cap 12 and the intermediate camshaft bearing cap 2, and in other embodiments, more than one camshaft bearing cap may be mounted on the rear rocker arm shaft 14 between the rear camshaft bearing cap 12 and the intermediate camshaft bearing cap 2.

Although the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that modifications and improvements can be made thereto. Therefore, such modifications and improvements are intended to be within the scope of the invention as claimed.

Claims

1. A lubricating structure for a camshaft bearing cover of a sectional rocker arm shaft is characterized by comprising a middle camshaft bearing cover, wherein a camshaft mounting hole is formed in the rear plane of the middle camshaft bearing cover, a camshaft bearing communicating oil duct is formed in the hole wall of the camshaft mounting hole, a camshaft bearing bush is arranged in the camshaft mounting hole, a camshaft lubricating oil groove is formed in the inner wall of the camshaft bearing bush, a camshaft bearing bush oil inlet hole is formed in the camshaft lubricating oil groove, and the camshaft bearing bush oil inlet hole is communicated with the camshaft bearing communicating oil duct;

2. The lubrication structure for a camshaft bearing cap of a segmented rocker shaft as claimed in claim 1, wherein said front oil groove and said rear oil groove are disposed in a splayed configuration.