The domestic reducer is mainly clamped. The braking method uses the brake rail (or brake beam) installed on the reducer to press the two sides of the wheel and generate friction to control the speed of the trolley. . The brake track of the reducer is generally processed by ordinary rails, which is basically the same as the material and hardness of the wheels.
From the microscopic point of view, the friction surface of friction material is generally uneven, with a certain degree of roughness. During dry friction braking, the two contact surfaces can be considered as a plurality of rugged projections in contact with each other. When a certain braking force is applied to the brake track, the higher convexity of the surface of the brake track that comes into contact with the wheel comes into contact first, and gradually and lowers as the higher convexity deforms (the peak is flattened). Micro-convex contact. As the contact process progresses, the contact area gradually increases until the resultant contact force is sufficient to support the external force.
In the braking process of the vehicle speed reducer, the positive pressure of the brake rail acting on both sides of the vehicle wheel is relatively large, the plastic flow of the frictional contact surface will be more obvious, and the convexity will be generated if the adhesion joint is detached or suddenly released. Vibration or other forms of energy emission cause abrupt changes in the coefficient of friction between friction materials, resulting in frictional noise.
The factors that affect frictional performance are complex, both microscopic and macroscopic. Relevant studies believe that the frictional properties of materials are related to the magnitude of the change in friction coefficient, ambient temperature and humidity, relative speed, and positive pressure. Small changes in various factors may cause changes in friction properties.
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