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导言各种闸瓦材料的摩擦系数特性对于闸瓦的运用和制动计算具有十分重要的意义。滑动速度、表面挤压应力、温度及摩擦表面状况等因素都会影响摩擦系数的绝对数值以及摩擦系数的特性;并且在绝大多数情况下,用不同的试验设备和试验条件所得出的结果也是不相同的。本文将论述摩擦系数与速度、表面挤压应力和温度等因素之间的关系。在试验台上求摩擦系数时,通常是将摩擦力和压紧力之此作为摩擦系数。在用闸瓦制动的情况下,闸瓦和轮箍具有弯曲的摩擦表面,当滚动圆直径为900～1,000毫米,通常的闸瓦长度≤400毫米(当
Introduction The friction coefficient characteristics of various brake shoe materials are of great importance to the operation and braking calculation of brake shoes. Sliding speed, surface compressive stress, temperature, and the condition of the friction surface all affect the absolute value of the coefficient of friction and the nature of the coefficient of friction; and in the vast majority of cases, the results obtained with different test equipment and test conditions are also not identical. This article will discuss the relationship between the friction coefficient and speed, surface extrusion stress and temperature and other factors. When seeking the coefficient of friction on the test bench, it is common to regard the friction and the pressing force as the friction coefficient. In the case of braking with brake shoes, brake shoes and tires have a curved friction surface with a rolling circle diameter of 900 to 1,000 mm and a typical brake shoe length of ≤ 400 mm