Friction coefficient of brake testing

Abstract

Nowadays, the automotive industry in Thailand has been widely growing. Brake pad is one of the automotive products that play a vital role in automotive industry because it is the most critical seeurity part. Consequently, testing products for quality are extremely requested. However, the precise equipment and function tests which show the real effects are not available enough and cost a lot. Therefore, they cannot response to the deman in the automotive industry development. In this study, the frictional test jigs for friction measurement JIS K7125 [5] and the clutch facings for automobiles JIS D4311 [6]. A study of the frictional test emphasizes on the static friction (μs) and kinetic friction (μk) in different condition. There are 3 specimens of brake pad supposted by the industry company. These specimens were tested and the results from the pin-ondisk and those from the friction testing were compared. The results revealed the correspondence of the two-sided results but the pin-on-disk’s friction coefficient is more than the friction testing’s friction coefficient by 19.56%. Moreover, the coefficient of friction varies according to the temperature Besides, the static friction (μs) is likely more than kinetic friction (μk) and tends to differ considerably under high pressure condition.