Freight car compartment powder metallurgy brake block

A powder metallurgy, carriage technology, applied in friction linings, mechanical equipment, etc., can solve the problems of unstable friction coefficient, wheel tread damage, poor heat dissipation, etc., to achieve reasonable shape structure design, stable friction performance, and improve production efficiency Effect

Inactive Publication Date: 2008-04-16
贵州新安航空机械有限责任公司
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  • Abstract
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Problems solved by technology

[0003] At present, the braking materials of railway freight cars are mostly high-phosphorus cast iron tiles and synthetic brake shoes. During the operation of railway freight cars after the speed is increased, their defects are gradually exposed. For example, the temperature of the friction surface of cast iron tiles increases during use. , the friction coefficient decreases, resulting in extended braking distance, because the cast iron tile has a large specific gravity and hardness and directly brakes on

Method used

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  • Freight car compartment powder metallurgy brake block
  • Freight car compartment powder metallurgy brake block
  • Freight car compartment powder metallurgy brake block

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Embodiment Construction

[0019] The powder metallurgy brake shoe of the truck compartment of the present invention is mainly composed of a tile back 4 and four brake blocks 3, the tile back 4 is formed by one-time casting of nodular cast iron or low-carbon cast steel; the brake block 3 is composed of a skeleton 5 and a powder metallurgy friction block 6; The powder metallurgy friction block 6 is made by mixing various powder metallurgy materials evenly in proportion, and after cold pressing, it is heated and pressure-sintered with the skeleton 5; the tile back 4 and the brake block 3 are welded around the rigid back 5 through the welding point 7 to the tile back or riveted together with the tile back through rivet 1 and rivet 2. The powder metallurgy friction block 6 is made of copper powder, tin powder, aluminum powder, molybdenum disulfide powder, graphite powder, alumina, iron powder, etc. according to the following weight ratio:

[0020] Copper powder 2~10 Tin powder 1~7 Aluminum powder 5~11 Molyb...

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Abstract

The invention relates to a powder metallurgy brake block for a boxcar, composed of a brake shoe back (4) and a shoe block (3) which are connected with each other, wherein, the brake shoe back (4) adopts the material of QT400-18 and is shaped by casting once; the shoe block and the brake shoe back adopt the connection structure of welding or riveting; a powder metallurgy friction block (6) on the shoe block (3) adopts powder metallurgy friction materials, takes iron as matrix, is added with lead, graphite, supramoly, copper and aluminium sesquioxide and so on, all of which are mixed uniformly pro rata, and is formed by chill pressing and compression sintering. The invention is characterized by reliable structure, stable drag friction performance, low surface temperature rise, small relative dispersion and good wearing resistance, etc., and is suited to starting or towing a car on a railway with speed at or below 160km/h.

Description

technical field [0001] The invention relates to a brake shoe for a railway vehicle, in particular to a powder metallurgy brake shoe for a carriage of a freight car. Background technique [0002] With the continuous development of the railway science and technology industry, the operating speed of railway trains is constantly increasing, and railway freight cars are developing in the direction of speed-up and heavy load. Therefore, the requirements for braking performance of brake shoes are also getting higher and higher. Not only brake shoes are required to have good Braking performance, and it is required that the brake shoes do not cause abnormal wear and damage to the wheel tread, no material transfer during braking, no harmful substances, and no pollution to the environment. [0003] At present, the braking materials of railway freight cars are mostly high-phosphorus cast iron tiles and synthetic brake shoes. During the operation of railway freight cars after the speed i...

Claims

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Application Information

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IPC IPC(8): F16D69/00F16D69/02
Inventor 冯友琴彭旭光范艳芳
Owner 贵州新安航空机械有限责任公司
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