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Use of plastic to produce automobile brake main cylinder piston and process

A technology of automobile braking and master cylinder piston, applied in the direction of piston, cylindrical piston, plunger, etc., can solve the problems of bumps, reduced machining accuracy, product failure, etc., and achieves improved service life, small friction coefficient and stable size Effect

Inactive Publication Date: 2003-06-25
玉环市金峰实业有限公司
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AI Technical Summary

Problems solved by technology

[0007] 1. Because the piston is generally made by metal cutting, the utilization rate of its material is low, usually less than 30%
[0008] 2. The processing technology of the piston generally needs to go through cutting, rough turning, fine turning, drilling, tapping, deburring, oxidation, centerless grinding and other processes, which is very complicated
[0009] 3. Due to the reduction of artificial processing accuracy due to multi-process processing, and the bumps in the process of handling and storage, the pass rate of the product is not high, generally lower than 85%.
[0010] 4. The piston moves repeatedly in the cylinder during use, so the piston made of metal material is easy to scratch the cylinder, resulting in product failure

Method used

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  • Use of plastic to produce automobile brake main cylinder piston and process
  • Use of plastic to produce automobile brake main cylinder piston and process

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Embodiment Construction

[0031] In this embodiment, PBTP plastic is used to make the piston. Mix PBTP and organic filler at a ratio of 1:0.08. The mixed raw materials were put into an oven for drying at a temperature of 102° C. for 1 hour. The drying time should also be adjusted according to the climate conditions, and the moisture content of the raw materials after drying should be below 0.2%. Put the dried raw materials into the injection machine and raise the temperature to 210°C. Injection machine for 20 seconds, high pressure for 2 seconds, cooling for 12 seconds. Then the shaped parts obtained were put into boiling water for 20 minutes. Finally, take it out and let it air dry at room temperature.

[0032] The piston made in this embodiment can be matched with various metal brake master cylinder blocks.

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Abstract

The present invention relates to automobile manufacture technology. Plastic, preferably BPTP, is used in manufacturing piston of main automobile brake cylinder, and the manufacture process includes mixing material, stoving injecting in injecting machine andfinal water setting. The present invention has the advantages of high material utilization, simple technological process, high product quality, light weight and prolonged service life of brake cylinder.

Description

technical field [0001] The invention belongs to the technical field of automobiles, and in particular relates to a use and a process for making a piston of a brake master cylinder of an automobile made of plastic. Background technique [0002] The brake master cylinder is a key component in the automobile braking system. Its main function is to push the piston in the master cylinder to move by the displacement of the pedal, thereby generating hydraulic pressure. The hydraulic pressure pushes the brake cylinder to move to expand the brake shoe, and the car is braked by the friction between the shoe and the wheel drum. [0003] The original brake master cylinder had only one piston, which drove the four brake wheel cylinders on the front and rear axles. When a certain wheel cylinder leaks oil, the entire braking system will fail. [0004] In the eighties, a brake master cylinder with two pistons was developed, which is called a dual-circuit brake master...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B29C45/00F16J1/01
Inventor 杨维和
Owner 玉环市金峰实业有限公司
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