Abstract
According to the convexity theory, the working principle of the disc brake of mining motor vehicle is analyzed. The dry friction force between brake disc and brake block is mainly composed of three mechanisms, such as meshing effect, adhesion effect and furrow effect. The Link NVH 3900 device is used to simulate the long downhill braking condition with bench test method, which can obtain friction performance with high credibility in different brake conditions. The average friction coefficient and friction stability coefficient are chosen as the evaluation parameter for friction performance judgment. Through the research results, it can be known that the average friction coefficient of the brake decreases linearly with brake pressure increases, the friction stability coefficient under different braking pressure showed numerically larger and smaller fluctuations. When the temperature of disc surface exceeds 200 °C, the resin lubricating film will be produced in the brake block, which will decrease the friction coefficient obviously. The actual braking torque does not increase linearly with the increase of braking pressure, especially when the brake speed is high, the friction coefficient will decrease obviously.
Highlights
With the improvement of coal mining capacity, the mining motor vehicle is developing rapidly in the direction of high speed and high carrying capacity, which requires higher reliability of the braking system [1]
According to the working condition of mining motor vehicle, the two parameters are taken as evaluation parameter of friction performance, including friction coefficient and friction stability coefficient
The friction stability coefficient is a common performance parameter in modern tribology, which can show the fluctuation of the friction coefficient
Summary
With the improvement of coal mining capacity, the mining motor vehicle is developing rapidly in the direction of high speed and high carrying capacity, which requires higher reliability of the braking system [1]. The coal industry standard shows that motor vehicle brake in the main mandatory requirements the precise control of braking torque, the ability of constant velocity keeping, good parking capacity, and stable service life. The hydraulic disc brake is widely applied in the braking system of mining motor vehicle, and gradually replaced the traditional brake-shoe brake, due to the advantages of large braking torque and good heat dissipation [2, 3]. Through the experimental study of friction parameters, the braking performance under different working conditions can be inferred, which would provide important basis and technical support for the reliability of mining motor vehicle braking system
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