【作者】 陈东； 叶鸣；

【Author】 CHEN Dong HUANG Ping (Mechanical Engineering College,South China University of Technology,Guangzhou 510640,China

【机构】 华南理工大学机械工程学院；

【摘要】 对有机半金属摩擦材料,在制动摩擦过程中,表面空气特性进行了试验研究．在制动过程中,摩擦表面的气体压力会产生变化．在小载荷制动条件下,摩擦表面的气体压力会产生负压;在较大的制动载荷作用下,气体压力会产生正压．引起变化的主要原因:是由表面气体的温度变化引起的;其次,在制动圆盘的带动下,气流从表面流过产生的吸引力也会对气体压力产生一定的影响．在制动过程中,表面气体最高温度出现的时间要滞后于表面最高温度出现的时间．表面气体的温度变化幅度比表面的温度变化幅度要小的多．表面气体压力值的变化很小,因此对摩擦系数的影响可忽略不计．但摩擦表面产生的负压会增大制动器拖磨的可能性．更多还原

【Abstract】 In the present paper,air pressure and temperature on the interface of the organic brake pads are measured by disc brake under braking condition,and their influences are studied as well.The experimental results show that the air temperature rise of the interface is gently.The air temperature peak is not as high as that on the surface.And,the air temperature peak lags significantly behind the surface temperature peak dur- ing braking.The air pressure of the interface varies with the applied load.The air pressure is negative under the small applied load,but positive pressure under the large applied load.The analysis of the experimental re- suits shows that the phenomena are caused by two factors.One is the air temperature and the other is the disc rotation.The heated air leads to the air pressure increasing,but the disc rotation draws the air onto the inter- face to decrease the air pressure.According to hydrodynamic lubrication theory,the air pressure of the inter- face influences on the friction coefficient.Since the air pressure is very small comparing with applied load,it influences on the friction coefficient slightly.For disc brakes,the negative air pressure of the interface increa- ses the chance of the drag friction in the non-braking mode.更多还原