Powder metallurgy brake lining for CRH5 (China railway high-speed) motor train unit

Abstract

The invention relates to a powder metallurgy brake lining for the CRH5 (China railway high-speed) motor train unit. The powder metallurgy brake lining is characterized by comprising 5 brake lining friction bodies, 1 dovetail block, 1 steel back plate, 5 rivets, 5 large gaskets, 5 small gaskets, 5 butterfly-shaped shrapnels, 15 cotter pins and 6 flush head rivets; the 5 friction brake lining bodies are fastened at the front part of the steel back plate; each brake lining friction body is formed by an equilaterally triangular friction body skeleton with three arc chamfers and a friction body; the section of the dovetail block is in a W-shaped long plate structure; the steel back plate is in an irregular hexagonal plate structure; the back of the steel back plate is connected with the dovetail block; the front part of the steel back plate is riveted with the 5 brake lining friction bodies by the large gaskets, the small gaskets and the butterfly-shaped shrapnels at intervals; all pin joint holes in the steel back plate are respectively connected with one ends of the cotter pins; the other ends of the cotter pins are correspondingly suspended in guide holes in all friction body skeletons. Process holes are formed in the upper, lower and arc edges of the steel back plate.

Description

technical field [0001] The invention relates to a brake pad, in particular to a powder metallurgy brake pad for a CRH5 type EMU capable of friction braking at a speed of 200-250 km / h. Background technique [0002] At present, most of the existing EMU vehicles are used for powder metallurgy brake pad friction bodies with a speed of 200-250km / h. The dovetail blocks are connected by welding process, which is relatively simple and saves cost. However, since the thickness of the steel back is only 3mm, the steel back is easily thermally deformed during welding, and there is still residual stress, which directly affects the uneven friction surface of the brake pad and the brake disc, and the steel back and the brake disc are not flat. There is no clearance adjustment between the friction bodies. When the brake pads are subjected to contact pressure from the rotating brake disc, the force on the contact surface will be uneven, which will affect the stability of the braking perform...

AI Technical Summary

Problems solved by technology

However, since the thickness of the steel back is only 3mm, the steel back is easily thermally deformed during welding, and there is still residual stress, which directly affects the uneven friction surface of the brake pad and the brake disc, and the steel back and the brake disc are not flat. There is no clearance adjustment between the friction bodies. When the brake pads are subjected to contact pressure from the rotating brake disc, the force on the contact surface will be uneven, which will affect the stability of the braking performance, resulting in the inability to ensure friction. The heat energy spreads evenly in the brake pads, which directly affects the local overload and overheating of the friction surface, which causes thermal cracks on the surface of the brake pads. Due to the uneven contact surface, it will also accelerate the traumatic movement of wear and increase the wear of materials.

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