CN215214485U

CN215214485U - Dovetail type powder metallurgy brake pad with asymmetric structure

Info

Publication number: CN215214485U
Application number: CN202120752509.7U
Authority: CN
Inventors: 庾正伟; 肖瑞; 吴海钰; 宋川; 张希虎; 张睿; 田雅萍
Original assignee: China Railway Longchang Materials Co Ltd
Current assignee: China Railway Longchang Materials Co Ltd
Priority date: 2021-04-13
Filing date: 2021-04-13
Publication date: 2021-12-17
Anticipated expiration: 2031-04-13

Abstract

The utility model discloses a dovetail type powder metallurgy brake lining with an asymmetric structure, which comprises a dovetail type steel back and a friction body arranged on the dovetail type steel back, wherein the front side of the dovetail type steel back is provided with a disk spring mounting groove for arranging a disk spring, and the back side of the dovetail type steel back is provided with a clamp spring mounting groove concentric with the disk spring mounting groove for arranging a clamp spring; the friction body is formed by combining and sintering a friction block, a framework and a pin; the friction block is a rectangular structure with an arc edge, wherein: the two long sides are arc-shaped, and the radius of the two long sides is 50-55 mm; two minor faces are straight sides, 20-25 mm long, four corners are rounded corners, and the radius is 5-7 mm. Compared with the prior art, the utility model has the positive effects that: the friction temperature can be effectively reduced, eccentric wear is avoided, cracking and damage caused by stress concentration at the sharp corner are avoided, the friction surface temperature is favorably reduced, and the thermal stress is reduced.

Description

Dovetail type powder metallurgy brake pad with asymmetric structure

Technical Field

The utility model relates to a dovetail type powder metallurgy brake lining of asymmetric structure.

Background

The high-speed motor train unit is in contact with the brake disc through the brake pads in the braking process, the kinetic energy of the train is absorbed and converted into heat by utilizing the friction force to do work, the train stops, and a large amount of friction heat and abrasive dust are generated in the process. The temperature of different areas on the surface of the brake pad is obviously different, and the friction block is easy to crack and fatigue damage under the action of uneven temperature and thermal stress. In order to obtain a good braking effect, the friction body needs to contact with the surface of the brake disc in an area as large as possible, the braking temperature of the surface of the brake pad is reduced, and meanwhile, the temperature difference of each area is required to be reduced, so that certain requirements are provided for the shape, the arrangement mode, the adjusting mechanism and the like of the friction body. The dovetail type powder metallurgy brake pad with the asymmetric structure at present has the following main problems:

1. the shape fitting degree of the regular hexagon friction body and the steel backing is poor, and the corners of the friction body exceed the outer contour of the steel backing.

2. The friction area distribution of each area is uneven, and the thermal stress concentration is easily caused.

3. The friction body is provided with more sharp corners, and cracking and damage caused by stress concentration are easy to occur.

4. Part of the friction bodies are arranged crowded, which is not beneficial to heat dissipation and chip removal.

Disclosure of Invention

In order to overcome the defects in the prior art, the utility model provides an asymmetric dovetail type powder metallurgy brake pad.

The utility model provides a technical scheme that its technical problem adopted is: a dovetail type powder metallurgy brake pad with an asymmetric structure comprises a dovetail type steel back and a friction body arranged on the dovetail type steel back, wherein a disc spring mounting groove is formed in the front side of the dovetail type steel back and used for arranging a disc spring, and a clamp spring mounting groove concentric with the disc spring mounting groove is formed in the back side of the dovetail type steel back and used for arranging a clamp spring; the friction body is formed by combining and sintering a friction block, a framework and a pin; the friction block is a rectangular structure with an arc edge, wherein: the two long sides are arc-shaped, and the radius of the two long sides is 50-55 mm; two minor faces are straight sides, 20-25 mm long, four corners are rounded corners, and the radius is 5-7 mm.

Furthermore, the depth of the disc spring mounting groove is 1-3 mm.

Furthermore, a spherical surface is arranged on the framework, and a ball socket is arranged on the steel backing.

Further, the inner diameter of the disc spring is matched with the maximum diameter of the root part of the spherical surface of the framework.

Furthermore, a gap of 0.5-2 mm is arranged between the framework and the steel backing.

Furthermore, the arrangement mode of the friction bodies is divided into an upper layer, a middle layer and a lower layer, and the long arc edges of the friction blocks are arranged along the outer contour of the steel backing.

Further, each friction block has a gap of 2mm or more.

Further, a stopper is provided between the friction blocks.

Further, the stop block is a triangular block or a long block.

Furthermore, a central hole with the diameter of 12-16 mm is formed in the friction block.

Compared with the prior art, the utility model has the positive effects that:

1. the long arc friction body with the arc-shaped long edge is adopted, the shape characteristics of the long arc-shaped friction body are more fit with the shape characteristics of the narrow and long steel back with the arc, the friction areas of all areas are more reasonably distributed, and the friction temperature can be effectively reduced.

2. The long arc edges of the friction bodies are arranged along the outer contour of the steel back, so that the uneven wear caused by the fact that the friction bodies exceed the steel back is avoided, the friction area distribution of the upper part and the lower part of the steel back is balanced, and the eccentric wear is avoided.

3. The friction body with the long arc edge avoids cracking and breakage caused by stress concentration at the sharp corner.

4. The friction bodies are more reasonably distributed, and gaps of more than 2mm are reserved among the friction bodies, so that heat dissipation and chip removal are facilitated, the temperature of the friction surfaces is reduced, and the thermal stress is reduced.

Drawings

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

fig. 1 is a top view of the present invention;

FIG. 2 is a schematic structural view of the present invention;

fig. 3 is a bottom view of the present invention;

fig. 4 is a schematic structural view of the friction body of the present invention;

fig. 5 is a schematic structural view of the friction block of the present invention;

description of reference numerals:

the friction body 1, the dovetail steel back 2 with the mounting groove, the stop block 3, the disc spring 4, the clamp spring 5, the disc spring mounting groove 6, the ball socket 7, the clamp spring mounting groove 8, the friction block 9, the framework 10, the spherical surface 11, the pin 12, the clamping groove 13, the central hole 14, the long arc edge 15, the straight edge 16 and the round angle 17.

Detailed Description

A dovetail type powder metallurgy brake pad with an asymmetric structure is shown in figures 1 and 2 and comprises a friction body 1, a dovetail type steel back 2 with an installation groove, a stop block 3, a disc spring 4, a clamp spring 5 and the like; wherein:

a disc spring mounting groove 6 is formed in the front face of the steel back 2, and a disc spring 4 is placed in the disc spring mounting groove 6; a clamp spring mounting groove 8 concentric with the disc spring mounting groove 6 is formed in the back surface of the steel back 2, and a clamp spring 5 is arranged in the clamp spring mounting groove, as shown in fig. 3; the friction body 1 is formed by combining and sintering a friction block 9, a framework 10 and a pin 12; the pin 12 penetrates through the disc spring 4 and the steel back 2, and the friction body assembly is fixed on the steel back 2 through the matching of the snap spring 5 and the clamping groove 13 on the pin 12, as shown in fig. 4.

As shown in fig. 5, the friction block 9 is a rectangular structure with arc sides 15, two long sides are arc-shaped with a radius of 50-55 mm, two short sides are straight sides 16 with a length of 20-25 mm, four corners are rounded corners 17 with a radius of 5-7 mm, a central hole 14 has a diameter of 12-16 mm, the arrangement mode is roughly divided into an upper layer, a middle layer and a lower layer, and the long arc sides 15 of the friction body are arranged along the outline of the steel back; 6 dark 1 ~ 3mm in belleville spring mounting groove, 8 dark 4 ~ 6mm in jump ring mounting groove are equipped with sphere 11 on the skeleton 10, and sphere 11 and the ball socket 7 contact on the steel backing when compressing to certain stroke realize the adjustment of frictional body 1 horizontal direction, and the cooperation of belleville spring 4 internal diameter and 11 root maximum diameter departments of skeleton sphere realizes the limiting displacement to frictional body 1. A gap of 0.5-2 mm is arranged between the framework 10 and the steel back 2, so that the framework has vertical adjustment capability on the steel back. Gaps of more than 2mm are formed among the friction blocks of each friction body 1, so that heat dissipation and chip removal are facilitated. A plurality of stop blocks 3 are arranged between the friction blocks 9 to prevent the friction body from rotating in the working process. The shape of the stop block 3 is a triangular block or a long block, and the stop block is selected and arranged according to the size and the shape of a gap between the friction blocks.

The utility model discloses a theory of operation does:

1. the utility model discloses combine the steel backing form to design a long arc friction member on band arc limit, make friction member long arc border steel backing profile arrangement, can balance each regional friction area distribution effectively, avoided the friction member to surpass the inhomogeneous wearing and tearing that the steel backing leads to simultaneously.

2. The friction body with the long arc edge avoids cracking and breakage caused by stress concentration at the sharp corner.

3. The friction bodies are more reasonably distributed, the friction heat distribution of each area is balanced, and gaps of more than 2mm are reserved among the friction bodies, so that the heat dissipation and chip removal are facilitated, the temperature of the friction surfaces is reduced, and the thermal stress is reduced.

4. The central hole 14 arranged on the friction block 9 is beneficial to heat dissipation and chip removal of the friction body, and effectively solves the problem of overhigh temperature of the friction body.

Claims

1. The dovetail type powder metallurgy brake pad with the asymmetric structure is characterized in that: the dovetail-shaped steel back is provided with a disk spring mounting groove on the front side for mounting a disk spring, and a clamp spring mounting groove concentric with the disk spring mounting groove on the back side for mounting a clamp spring; the friction body is formed by combining and sintering a friction block, a framework and a pin; the friction block is a rectangular structure with an arc edge, wherein: the two long sides are arc-shaped, and the radius of the two long sides is 50-55 mm; two minor faces are straight sides, 20-25 mm long, four corners are rounded corners, and the radius is 5-7 mm.

2. The asymmetric dovetail powder metallurgy brake pad of claim 1, wherein: the depth of the disc spring mounting groove is 1-3 mm.

3. The asymmetric dovetail powder metallurgy brake pad of claim 1, wherein: the framework is provided with a spherical surface, and the steel backing is provided with a ball socket.

4. The asymmetric dovetail powder metallurgy brake pad of claim 3, wherein: the inner diameter of the disc spring is matched with the maximum diameter of the root part of the spherical surface of the framework.

5. The asymmetric dovetail powder metallurgy brake pad of claim 1, wherein: and a 0.5-2 mm gap is formed between the framework and the steel backing.

6. The asymmetric dovetail powder metallurgy brake pad of claim 1, wherein: the friction body arrangement mode is divided into an upper layer, a middle layer and a lower layer, and the long arc edges of the friction blocks are arranged along the outer contour of the steel backing.

7. The asymmetric dovetail powder metallurgy brake pad of claim 1, wherein: gaps of more than 2mm are formed between the friction blocks.

8. The asymmetric dovetail powder metallurgy brake pad of claim 7, wherein: a stop block is arranged between the friction blocks.

9. The asymmetric dovetail powder metallurgy brake pad of claim 8, wherein: the stop block is a triangular block or a long block.

10. The asymmetric dovetail powder metallurgy brake pad of claim 1, wherein: a central hole with the diameter of 12-16 mm is formed in the friction block.