CN215214469U

CN215214469U - Dovetail type powder metallurgy brake lining with octagonal structure friction block

Info

Publication number: CN215214469U
Application number: CN202120902841.7U
Authority: CN
Inventors: 肖瑞; 吴海钰; 庾正伟; 宋川; 张希虎; 张睿
Original assignee: China Railway Longchang Materials Co Ltd
Current assignee: China Railway Longchang Materials Co Ltd
Priority date: 2021-04-28
Filing date: 2021-04-28
Publication date: 2021-12-17
Anticipated expiration: 2031-04-28

Abstract

The utility model discloses a dovetail type powder metallurgy brake lining with octagonal structure clutch blocks, including the steel backing and the friction body of setting on the steel backing, the friction block of friction body is octagonal structure, including two long limits, two minor faces and four hypotenuses that the symmetry set up, wherein: the length of the long side is 25-35 mm, the length of the short side is 8-15 mm, the length of the bevel edge is 12-20 mm, eight corners are rounded corners, and the radius is 4-6 mm; the front surface of the steel back is provided with a disk spring mounting groove for arranging a disk spring, and the back surface of the steel back is provided with a clamp spring mounting groove concentric with the disk spring mounting groove for arranging a clamp spring. Compared with the prior art, the utility model has the positive effects that: cracking and damage caused by uneven wear and stress concentration can be effectively avoided; the friction temperature can be effectively reduced, the stress of each area can be balanced, and eccentric wear can be avoided; the friction surface temperature is reduced, and the thermal stress is reduced.

Description

Dovetail type powder metallurgy brake lining with octagonal structure friction block

Technical Field

The utility model relates to an asymmetric structure's dovetail type powder metallurgy brake lining especially relates to a dovetail type powder metallurgy brake lining with octagon structure clutch blocks.

Background

The high-speed motor train unit has the advantages that the operation speed is higher and higher, the higher requirements are provided for the stability and the reliability of the braking process of the high-speed motor train unit, the high-speed motor train unit serves as a key part of the safe operation of a train, the friction force generated by the contact of the high-speed motor train unit and a brake disc stops in the braking process, the train brake disc accumulates a large amount of heat during the braking process, the friction block is easy to crack, damage, aggravate abrasion and the like under the action of thermal stress, in order to obtain a better braking effect, the stability and the reliability of the brake disc are improved, the braking temperature of the surface of the brake disc is reduced, the stress distribution of each area is effectively improved, and various factors such as the shape, the arrangement mode, the adjusting mechanism and the like of a friction body directly influence the high-speed motor train unit. The dovetail type powder metallurgy brake pad with the asymmetric structure at present has the following main problems:

1. the shape of the friction body is poor in fit with the shape of the steel backing, the friction area distribution of each area is uneven, and thermal stress concentration and eccentric wear are easily caused.

2. The corners of the friction body exceed the outline of the steel backing, and the friction body is provided with more sharp corners, so that the friction body is easy to crack and damage caused by uneven wear and stress concentration.

3. Part of the friction bodies are arranged crowded, which is not beneficial to heat dissipation and chip removal, and leads to higher temperature of the friction surface.

Disclosure of Invention

In order to overcome the above disadvantages of the prior art, the utility model provides a dovetail type powder metallurgy brake lining with octagonal structure clutch blocks.

The utility model provides a technical scheme that its technical problem adopted is: the utility model provides a dovetail type powder metallurgy brake lining with octagonal structure clutch blocks, includes the steel backing and sets up the frictional body on the steel backing, the clutch blocks of frictional body is the octagonal structure, including two long limits, two minor faces and four hypotenuses that the symmetry set up, wherein: the length of the long side is 25-35 mm, the length of the short side is 8-15 mm, the length of the bevel edge is 12-20 mm, eight corners are rounded corners, and the radius is 4-6 mm; the front surface of the steel back is provided with a disk spring mounting groove for arranging a disk spring, and the back surface of the steel back is provided with a clamp spring mounting groove concentric with the disk spring mounting groove for arranging a clamp spring.

Furthermore, the depth of the disc spring installation groove is 1-3 mm, and the depth of the clamp spring installation groove is 4-6 mm.

Furthermore, a spherical surface is arranged on the framework of the friction body, and a ball socket is arranged on the steel back.

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 of the friction body and the steel back.

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

Further, the friction blocks of each friction body have a gap of 2mm or more.

Further, a stopper is provided between the friction blocks.

Further, the shape of the stop block is triangular or trapezoidal.

Furthermore, a central hole with the diameter of 12-16 mm is arranged on the friction block of the friction body.

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

1. the utility model discloses a steel backing shape characteristics of narrow microscler just having the circular arc can agree with better to the octagon friction member of deformation, is favorable to the rational arrangement of friction member, has avoided the friction member corner to surpass the steel backing profile and the inhomogeneous wear appears, and the fillet design has avoided fracture, the damage that stress concentration arouses.

2. The utility model discloses a friction body is according to upper, middle and lower three-layer distribution, and the arrangement rule is neat, and long limit is arranged along the steel backing outline, makes each regional friction area distribution more even, reasonable, can effectively reduce the friction temperature and balance each regional stress, avoids appearing the eccentric wear.

3. The utility model discloses a friction body position distributes rationally, all has the clearance more than 2mm between each friction body, and sufficient space of hypotenuse department is favorable to heat dissipation and chip removal, helps reducing the friction surface temperature, reduces thermal stress.

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 steel back 2, the disc spring 3, the clamp spring 4, the disc spring mounting groove 5, the ball socket 6, the stop block 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 edge 15, the short edge 16, the bevel edge 17 and the round angle 18.

Detailed Description

A dovetail type powder metallurgy brake pad with a friction block of an octagonal structure is shown in figures 1 and 2 and comprises a friction body 1, a steel back 2, a disc spring 3, a clamp spring 4, a stop block 7 and the like, wherein:

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

The friction block 9 is of an octagonal structure, two symmetrical sides are equal in length, wherein two long sides 15 are 25-35 mm long, two short sides 16 are 8-15 mm long, four oblique sides 17 are 12-20 mm long, eight corners are fillets 18, the radius is 4-6 mm, and the diameter of a central hole 14 is 12-16 mm, as shown in fig. 5.

The arrangement mode of the friction bodies is roughly divided into an upper layer, a middle layer and a lower layer, the whole friction bodies are regular and tidy, and the long edges 15 of the friction blocks 9 are arranged along the outer contour of the steel backing 2; the depth of the disc spring mounting groove 5 is 1-3 mm, the depth of the clamp spring mounting groove 8 is 4-6 mm, the framework 10 is provided with a spherical surface 11, and when the disc spring mounting groove is compressed to a certain stroke, the spherical surface 11 is in contact with a ball socket 6 on a steel back, so that the horizontal direction of the friction body 1 is adjusted. The inner diameter of the disc spring 3 is matched with the maximum diameter of the root of the spherical surface 11 of the framework 10, so that the friction body 1 is limited. A gap of 0.5-2 mm is arranged between the framework 10 and the steel backing 2, so that the framework 10 has vertical adjustment capability on the steel backing 2. 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 7 are arranged between the friction bodies to prevent the friction bodies from rotating in the working process. The shape of the stop block 7 is triangular or trapezoidal, and the stop block is selected and arranged according to the size and the shape of the 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 the octagon frictional body 1 of a deformation, avoided the frictional body to surpass the inhomogeneous wear that the steel backing leads to, and take the frictional body of fillet 18 to avoid the fracture and the damage that sharp corner department stress concentration arouses.

2. The friction bodies are distributed according to the upper layer, the middle layer and the lower layer, the arrangement is regular and neat, the long edge 15 is arranged along the outer contour of the steel backing 2, the friction area distribution of each area is more uniform and reasonable, the friction temperature can be effectively reduced, the stress of each area can be balanced, and eccentric wear can be avoided.

3. The friction bodies are more reasonably distributed, the friction heat distribution of each area is balanced, gaps of more than 2mm are reserved among the friction bodies, and sufficient space at the inclined edge 17 is beneficial to heat dissipation and chip removal, and is beneficial to reducing the temperature of the friction surfaces and reducing the thermal stress.

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 utility model provides a dovetail type powder metallurgy brake lining with octagon structure clutch block which characterized in that: including the steel backing and the friction body of setting on the steel backing, the clutch blocks of friction body is octagon structure, including two long limits, two minor faces and four hypotenuses that the symmetry set up, wherein: the length of the long side is 25-35 mm, the length of the short side is 8-15 mm, the length of the bevel edge is 12-20 mm, eight corners are rounded corners, and the radius is 4-6 mm; the front surface of the steel back is provided with a disk spring mounting groove for arranging a disk spring, and the back surface of the steel back is provided with a clamp spring mounting groove concentric with the disk spring mounting groove for arranging a clamp spring.

2. The dovetail type powder metallurgy brake lining with friction blocks of octagonal structure according to claim 1, wherein: the depth of the disc spring mounting groove is 1-3 mm, and the depth of the clamp spring mounting groove is 4-6 mm.

3. The dovetail type powder metallurgy brake lining with friction blocks of octagonal structure according to claim 1, wherein: the skeleton of the friction body is provided with a spherical surface, and the steel back is provided with a ball socket.

4. The dovetail type powder metallurgy brake lining with friction blocks of octagonal structure according to 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 dovetail type powder metallurgy brake lining with friction blocks of octagonal structure according to claim 1, wherein: a gap of 0.5-2 mm is arranged between the framework of the friction body and the steel back.

6. The dovetail type powder metallurgy brake lining with friction blocks of octagonal structure according to claim 1, wherein: the friction body arrangement mode is divided into an upper layer, a middle layer and a lower layer, and the long edges of the friction blocks are arranged along the outline of the steel backing.

7. The dovetail type powder metallurgy brake lining with friction blocks of octagonal structure according to claim 1, wherein: the friction blocks of each friction body have a gap of 2mm or more.

8. The dovetail powder metallurgy brake lining with friction blocks having an octagonal structure according to claim 7, wherein: a stop block is arranged between the friction blocks.

9. The dovetail powder metallurgy brake lining with friction blocks having an octagonal structure according to claim 8, wherein: the shape of the stop block is triangular or trapezoidal.

10. The dovetail type powder metallurgy brake lining with friction blocks of octagonal structure according to claim 1, wherein: a central hole with the diameter of 12-16 mm is formed in the friction block of the friction body.