Brake camshaft with self-lubricating structure

Abstract

The utility model discloses a brake cam shaft with a self-lubricating structure, which comprises a shaft body (1), one end of the shaft body (1) is provided with an S-shaped cam head (2), and the other end of the shaft body (1) is provided with an external spline (3); an oil storage groove (4) is formed in the axis position of the shaft body (1), an oil injection hole (5) communicated with the oil storage groove (4) is formed in the shaft body (1), and a one-way oil injection nozzle (6) is connected to the oil injection hole (5) in a threaded mode. The shaft body (1) is provided with a plurality of lubricating grooves (7) distributed at intervals in the axial direction, and the lubricating grooves (7) are annularly arranged. A plurality of first oil outlet holes (8) which are annularly and uniformly distributed are formed in the lubricating groove (7), and the first oil outlet holes (8) are communicated with the oil storage groove (4); an annular sponge (9) is arranged in the lubricating groove (7) in a matched mode, and the sponge (9) shields and covers all the first oil outlet holes (8). The utility model not only can improve the lubricating effect, but also has the advantage of low maintenance frequency.

Description

Technical Field

[0001] The utility model relates to the field of brake camshafts, in particular to a brake camshaft with a self-lubricating structure. Background Art

[0002] The brake camshaft is one of the parts in the drum brake. Its main body is rotatably connected to the shaft hole, the external spline at one end is connected to the adjusting arm, and the S-shaped cam head at the other end is used to cooperate with the brake shoe; after the brake camshaft is driven to rotate by the adjusting arm, the S-shaped cam head on the brake camshaft rotates to drive the brake shoe to brake. In order to ensure that the brake camshaft can rotate smoothly, the brake camshaft needs to be lubricated regularly and maintained frequently; therefore, ZL201820159412.3 discloses a brake camshaft, which is provided with a shaft hole for oil storage inside, and a plurality of oil storage ring grooves on the shaft body, and each oil storage ring groove is provided with a guide hole connecting the oil storage ring groove and the shaft hole, so as to achieve the self-lubricating effect of the brake camshaft for a period of time and extend the maintenance frequency. However, since the maximum rotation angle of the brake camshaft can only reach 180° during use, it is difficult for the lubricating oil flowing out of the guide hole to fully lubricate the outer side of the shaft body through the oil storage ring groove, and the lubrication effect is poor.

[0003] Therefore, the existing brake camshaft has the problem of poor lubrication effect. Utility Model Content

[0004] The utility model aims to provide a brake camshaft with a self-lubricating structure.

[0005] The utility model has the advantage of better lubrication effect.

[0006] The technical solution of the utility model is as follows: a brake camshaft with a self-lubricating structure, comprising a shaft body, an S-shaped cam head is arranged at one end of the shaft body, and an external spline is arranged at the other end of the shaft body; an oil storage groove is arranged at the axial center part of the shaft body, an oil filling hole connected with the oil storage groove is arranged on the shaft body, and a one-way oil filling nozzle is threadedly connected at the oil filling hole; a plurality of lubrication grooves spaced apart along the axial direction are arranged on the shaft body, and the lubrication grooves are arranged in a ring shape; a plurality of No. 1 oil outlet holes evenly distributed in a ring shape are arranged in the lubrication groove, and the No. 1 oil outlet holes are connected with the oil storage tank; a ring-shaped sponge is arranged in the lubrication groove, and the sponge blocks and covers all the No. 1 oil outlet holes.

[0007] In the aforementioned brake camshaft with a self-lubricating structure, the oil filling hole is located at one end of the shaft body provided with an external spline.

[0008] In the aforementioned brake camshaft with a self-lubricating structure, a No. 2 oil outlet hole is provided in each keyway of the external spline, and the No. 2 oil outlet hole is connected to the oil storage tank.

[0009] In the aforementioned brake camshaft with a self-lubricating structure, a hollow column is connected to the inside of the No. 2 oil outlet hole, a steel ball is provided at the top of the hollow column to limit the position, and the top of the steel ball protrudes outside the hollow column; a sealing cover is connected to the bottom of the hollow column, and a spring is provided between the sealing cover and the steel ball; a through hole connected to the oil storage tank is provided on one side of the bottom of the hollow column.

[0010] In the aforementioned brake camshaft with a self-lubricating structure, a sponge column is provided in the middle of the spring.

[0011] Compared with the prior art, the utility model provides an oil storage tank at the axial center of the shaft body, and provides a plurality of annular lubrication grooves on the shaft body that are distributed at intervals along the axial direction, each lubrication groove is provided with a plurality of No. 1 oil outlet holes that are arranged in an annular shape and connected to the oil storage tank, and a sponge that blocks and covers all the No. 1 oil outlet holes is provided in each lubrication groove; the lubricating oil in the lubrication tank can flow out from the plurality of No. 1 oil outlet holes into the sponge, and under the capillary action, the lubricating oil can better fill the entire sponge, thereby achieving a more comprehensive lubrication effect; the sponge can also prevent the lubricating oil from flowing out quickly, while ensuring the lubrication effect, extending the lubrication duration, thereby reducing the maintenance frequency.

[0012] In addition, in the utility model, each keyway of the external spline is provided with a No. 2 oil outlet hole connected to the oil storage tank, and each oil outlet hole is connected with a hollow column, and a through hole connected to the oil storage tank is provided on one side of the bottom of the hollow column; when the adjusting arm drives the shaft body to rotate through the external spline, it will press the steel ball on the top of the hollow column, and the steel ball can press the spring and the sponge column in the spring, so that the lubricating oil adsorbed in the sponge column is squeezed, so that a part of the lubricating oil flows out from the top of the hollow column to lubricate the keyway of the external spline.

[0013] Therefore, the utility model can not only improve the lubrication effect, but also has the advantage of low maintenance frequency. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of the utility model;

[0015] Figure 2 It is a cross-sectional view of the utility model;

[0016] Figure 3 yes Figure 2 Magnified view of area A.

[0017] The markings in the accompanying drawings are: 1-shaft body, 2-cam head, 3-external spline, 4-oil storage tank, 5-oil filling hole, 6-one-way oil filling nozzle, 7-lubrication groove, 8-No. 1 oil outlet hole, 9-sponge, 10-No. 2 oil outlet hole, 11-hollow column, 12-steel ball, 13-cover, 14-spring, 15-through hole, 16-sponge column. DETAILED DESCRIPTION

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present invention.

[0019] Embodiment. A brake camshaft with a self-lubricating structure, comprising: Figures 1 to 3 As shown, it includes a shaft body 1, one end of which is provided with an S-shaped cam head 2, and the other end of the shaft body 1 is provided with an external spline 3; an oil storage tank 4 is provided at the axial center of the shaft body 1, and an oil filling hole 5 connected to the oil storage tank 4 is provided on the shaft body 1, and a one-way oiling nozzle 6 is threadedly connected to the oil filling hole 5; a plurality of lubrication grooves 7 distributed along the axial direction at intervals are provided on the shaft body 1, and the lubrication groove 7 is arranged in a ring shape; a plurality of No. 1 oil outlet holes 8 evenly distributed in a ring shape are provided in the lubrication groove 7, and the No. 1 oil outlet hole 8 is connected to the oil storage tank 4; a ring-shaped sponge 9 is provided in the lubrication groove 7, and the sponge 9 blocks and covers all the No. 1 oil outlet holes 8.

[0020] The oil filling hole 5 is located at one end of the shaft body 1 where the external spline 3 is provided; a No. 2 oil outlet hole 10 is provided in each keyway of the external spline 3, and the No. 2 oil outlet hole 10 is connected to the oil storage tank 4; a hollow column 11 is connected to the No. 2 oil outlet hole 10, and a steel ball 12 is provided at the top of the hollow column 11 as a limit, and the top of the steel ball 12 is protruding outside the hollow column 11; a cover 13 is connected to the bottom of the hollow column 11, and a spring 14 is provided between the cover 13 and the steel ball 12; a through hole 15 connected to the oil storage tank 4 is provided on one side of the bottom of the hollow column 11; a sponge column 16 is provided in the middle of the spring 14.

[0021] Working principle: When the brake is activated, the adjusting arm can drive the shaft body 1 to rotate through the external spline 3, thereby driving the S-shaped cam head 2 at the other end of the shaft body 1 to rotate, and the cam head 2 can brake the wheel through the brake shoe.

[0022] Since an oil storage tank 4 containing lubricating oil is provided at the axial center part of the shaft body 1, and a plurality of annular lubricating grooves 7 spaced apart along the axial direction are provided on the shaft body 1, and a plurality of annular No. 1 oil outlet holes 8 evenly distributed in annular shapes are provided in each lubricating groove 7, and an annular sponge 9 is provided in each lubricating groove 7; the lubricating oil in the oil storage tank 4 can flow out from the No. 1 oil outlet hole 8 under the influence of gravity and be absorbed by the sponge 9, and the capillary action of the sponge 9 itself can lead the lubricating oil from the bottom where it is more concentrated to the top where the lubricating oil is less; as the shaft body 1 rotates, each part of the sponge 9 can contain a certain amount of lubricating oil, and the lubricating oil in the sponge 9 can better lubricate the outer side of the shaft body 1 after penetrating and diffusing outwards; among them, the sponge 9 can also prevent the lubricating oil from flowing out of the oil storage tank 4 quickly to cause excessive waste, thereby reducing the maintenance frequency.

[0023] Since a through hole 15 connected to the oil storage tank 4 is provided on one side of the bottom of the hollow column 11, the lubricating oil can enter the hollow column 11 through the through hole 15 and be absorbed by the sponge column 16. When the adjusting arm drives the shaft body 1 to rotate through the external spline 3, the steel ball 12 protruding from the corresponding keyway can be pressed down. At this time, the steel ball 12 compresses the spring 14 on the cover 13 in the hollow column 11 and the sponge column 16 in the middle of the spring 14, so that the lubricating oil absorbed in the sponge column 16 is squeezed out, and part of the squeezed lubricating oil can flow out from the top of the hollow column 11 to lubricate the keyway.

[0024] When lubricating oil needs to be added for maintenance, the staff only needs to inject the lubricating oil into the oil storage tank 4 through the one-way oiling nozzle 6 on the oil filling hole 5.

Claims

1. A brake camshaft with a self-lubricating structure, comprising a shaft body (1), one end of the shaft body (1) is provided with an S-shaped cam head (2), and the other end of the shaft body (1) is provided with an external spline (3); characterized in that: The shaft body (1) is provided with an oil storage groove (4) at the axial center thereof, and an oil injection hole (5) connected to the oil storage groove (4) is provided on the shaft body (1), and a one-way oil injection nozzle (6) is threadedly connected to the oil injection hole (5); the shaft body (1) is provided with a plurality of lubrication grooves (7) distributed at intervals along the axial direction, and the lubrication grooves (7) are arranged in an annular shape; a plurality of No. 1 oil outlet holes (8) evenly distributed in an annular shape are provided in the lubrication groove (7), and the No. 1 oil outlet holes (8) are arranged in communication with the oil storage groove (4); a sponge (9) in an annular shape is provided in the lubrication groove (7), and the sponge (9) covers all the No. 1 oil outlet holes (8).

2. The brake camshaft with a self-lubricating structure according to claim 1, characterized in that: The oil filling hole (5) is located at one end of the shaft body (1) where the external spline (3) is provided.

3. The brake camshaft with a self-lubricating structure according to claim 1, characterized in that: A second oil outlet hole (10) is provided in each keyway of the external spline (3), and the second oil outlet hole (10) is communicated with the oil storage tank (4).

4. The brake camshaft with a self-lubricating structure according to claim 3, characterized in that: The second oil outlet hole (10) is matched with a hollow column (11), the top of the hollow column (11) is provided with a steel ball (12) for limiting the position, and the top of the steel ball (12) is provided outside the hollow column (11); the bottom of the hollow column (11) is connected with a cover (13), and a spring (14) is provided between the cover (13) and the steel ball (12); and one side of the bottom of the hollow column (11) is provided with a through hole (15) which is connected with the oil storage tank (4).

5. The brake camshaft with a self-lubricating structure according to claim 4, characterized in that: A sponge column (16) is provided in the middle of the spring (14).

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