Hot Spot Heating by Composition Shoes

Abstract

It is generally understood that uneven heating of the tread of a wheel during braking is possible. A method has been devised to measure the intensity and frequency of hot spots on the wheel tread surface. After a description of the measurement apparatus and technique, results of a study of hot spots during constant speed brake applications with single composition shoes are presented. Possible lowering of the hot spot level by increasing the conformability of the brake shoe is studied by cutting one slot across each pad of a brake shoe. This method of hot spot study may be useful for future analysis and improvement of brake shoes.

The Thermo-Mechanical Behavior in Automotive Brake and Clutch Systems

“…Evidence of thermal cracks has been observed in railway brakes (Dow (1980), Fec andSehitoglu (1985)), mechanical seals (Netzel (1980), Kennedy and Karpe (1982)) and automotive brakes (Anderson and Knapp (1989). High temperatures are another consequence of the high local heat flux, which also has been reported in the railway brake (Van Swaay (1969), Ho et al (1974), Wentenkamp andKipp (1976), Van Swaay (1979), Hewitt and Musial (1979)). Investigations have been carried out to improve the performance of the brake system primarily through lowering the surface temperatures.…”