Squeal of Rigid Type Disk Brake for Car

Abstract

This paper deals with the occurrence mechanism of the squeal generated in the rigid type disk brakes for car and its countermeasure by cutting a part of the pad surfaces in the circumferential and radial directions experimentally and theoretically. The squeal reduction has been investigated by using a bench test rig separating a brake unit consisting of rotor, caliper and pads only from a brake assembly, when verifying countermeasure against the squeal in the car disk brakes. However, the squeal generated in actual cars cannot he exactly reproduced on a bench test rig. Hence, in this paper, by using two different bench test rigs installed a common brake unit, the common features of the squeal phenomena and the effective countermeasure were made clear. Moreover, a simple analytical model coupled between rotor and caliper through pads regarded as elastic elemet was applied to the analysis of the low frequency squeal of the rigid type disk brake. It was confirmed that the analytical results were in a fine agreement with the experimental ones.