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Braking drum with bionic non-smooth surface

A non-smooth surface and brake drum technology, applied in the direction of brake drums, etc., to achieve good thermal fatigue resistance, improved thermal fatigue resistance, and reduced wear

Inactive Publication Date: 2008-12-03
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the contradiction between improving the friction coefficient of the brake drum surface and reducing the wear of the brake pair. Through the bionic non-smooth surface modification treatment, a device that can simultaneously improve the friction coefficient, wear resistance and anti-wear of the brake drum surface is designed. Brake drum with biomimetic non-smooth surface for thermal fatigue and other properties

Method used

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  • Braking drum with bionic non-smooth surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Fabrication of heavy duty truck brake drums with convex non-smooth morphology on the surface.

[0038] refer to figure 1, the surface of the brake drum is machined with a laser to have a convex-hull non-smooth surface, the height difference between the non-smooth unit body and the surface of the brake drum base is 0.5 mm, the diameter of the bottom circle d is 4 mm, and the center distance s of the unit body is 50mm. The material of the brake drum is HT250 gray iron, the coefficient of friction is 0.37, and the hardness is HB 175.

[0039] The indicators of the non-smooth unit tested after processing are friction coefficient: 0.67, hardness: HB 520, friction coefficient increased by 0.30, hardness increased by HB 345, and the service life of the brake drum with bionic non-smooth surface is longer than that of the smooth surface of the same substrate The brake drum is doubled, while the cost of processing bionic non-smooth surfaces is only increased by 5%.

Embodiment 2

[0041] Manufacture of heavy duty truck brake drums with dimpled non-smooth morphology on the surface.

[0042] refer to figure 2 , the surface of the brake drum is processed into a pit-shaped non-smooth surface with a laser, the height difference between the non-smooth unit body and the surface of the brake drum base is 0.5mm, the diameter d of the upper opening of the pit is 4mm, and the distance between the center of the unit body is s is 50mm. The material of the brake drum is HT250 gray iron, the coefficient of friction is 0.37, and the hardness is HB 175.

[0043] The indicators of the non-smooth unit tested after processing are friction coefficient: 0.67, hardness: HB 518, friction coefficient increased by 0.30, hardness increased by HB 343, and the service life of the brake drum with bionic non-smooth surface is longer than that of the smooth surface of the same substrate The brake drum is doubled, while the cost of processing bionic non-smooth surfaces is only incre...

Embodiment 3

[0045] Manufacture of heavy duty truck brake drums with striated non-smooth morphology on the surface.

[0046] refer to image 3 , the surface of the brake drum is processed into a striped non-smooth surface by laser, the height difference between the non-smooth unit body and the surface of the brake drum base is 0.5 mm, the width w is 3 mm, the center distance s of the unit body is 40 mm, and the inclination angle α is about 45°. The material of the brake drum is HT250 gray iron, the coefficient of friction is 0.37, and the hardness is HB 175.

[0047] After processing, the indicators of the non-smooth unit body are tested as friction coefficient: 0.70, hardness: HB 532, friction coefficient increased by 0.33, hardness increased by HB 357, and the service life of the brake drum with bionic non-smooth surface is longer than that of the smooth surface of the same substrate The brake drum is 1.2 times higher, while the cost of processing bionic non-smooth surfaces is only 8% ...

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Abstract

A drum break with bionic rough surface characters high friction index, anti-wear, anti-heat fatigue. On the surface of the drum break distribute knaggy units of height 0.15-0.5 mm in parallel or net. The structure and chemical components of the knaggy units increase the ability of anti-friction and anti-heat fatigue of the drum break. The structure of the knaggy units changes a surface friction to point friction therefore reduce wearniess of the drum break. The life this knagg drum break is 1.5-3 times of that of same material in smooth.

Description

technical field [0001] The invention relates to a high friction coefficient, wear-resistant, thermal fatigue-resistant brake drum for vehicles. Background technique [0002] The device that uses the frictional resistance generated when the moving surfaces are in contact to slow down or stop the movement is called a friction brake or a mechanical brake. The chemical composition and structure of the brake drum in the process of brake friction is one of the important factors that affect the characteristics of the friction pair and the reliability of the work. Taking the automobile brake drum as an example, the brake drum is required to have good friction performance and be less affected by the environment, including low temperature (<0°C), high temperature (500-600°C), humidity (road area water), or high or low Braking initial speed, braking deceleration, occasional multiple consecutive braking, etc. These characteristics of automobile brake drums have a lot to do with the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16D65/10
Inventor 周宏任露泉王磊单宏宇张志辉宋起飞
Owner JILIN UNIV
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