A new type of dovetail-shaped powder metallurgy brake pad for EMU

The structural design of separating the dovetail block from the steel back solves the problem of high-temperature failure of the disc-shaped shrapnel, improves the floatability and connection stability of the brake piece, and ensures the safe braking of high-speed trains.

CN112253661BActive Publication Date: 2025-09-19SHANDONG HEZE DETONG NEW MATERIAL TECH CO LTD +1
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Patent Information

Application Number
CN202011157731.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2020-10-26
Publication Date
2025-09-19
Estimated Expiration
2040-10-26

AI Technical Summary

Technical Problem

The existing dovetail-type powder metallurgy brake pads are prone to failure of the disc-shaped springs at high temperatures, resulting in metal embedding, which affects the braking safety of the train.

Method used

The dovetail block is designed to be separated from the steel back, and the disc-shaped spring is placed on the rear side of the connecting plate and connected through limiters and elastic parts to increase the floating and heat dissipation properties of the friction body assembly and improve the heating conditions of the disc-shaped spring.

Benefits of technology

It effectively reduces the temperature decay of the disc spring, improves the floating performance and connection stability of the brake pad, reduces the metal inlay phenomenon, and ensures the reliability of the braking process.

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Abstract

The present invention relates to the field of processing and manufacturing of railway product parts, and specifically to a novel dovetail-type EMU powder metallurgy brake pad, wherein the front side of the dovetail block is provided with a plurality of connecting plates extending to the outside of the dovetail block, the front side of the connecting plate is provided with a steel back, and a plurality of friction body assemblies are fixedly installed on the front side of the steel back, a first connecting hole is provided on the steel back, and a second connecting hole is provided on the connecting plate, a limiting piece for connecting the steel back and the connecting plate is passed through the first connecting hole and the second connecting hole, a mounting groove is further provided on the rear side of the connecting plate at a position corresponding to the second connecting hole, and an elastic piece located between the limiting piece and the connecting plate is provided in the mounting groove; the present invention changes the traditional one-piece cast steel back into a structure in which the dovetail block and the steel back are separated, and a disc-shaped spring piece is placed on the rear side of the connecting plate of the dovetail block, the disc-shaped spring piece and the friction body assembly are far apart, and the temperature of the friction body assembly is greatly attenuated when it is transferred to the disc-shaped spring piece, thereby effectively solving the problem of failure of the disc-shaped spring piece due to heat.
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