Squeal of a Disk Brake of Floating Type for Cars. 1st Report. Relationship between Occurrence of Squeal and Contact Region between Rotor and Pads in Experiment.

Abstract

This paper describes the experimental results of squeal of disk brake of floating type. The squeal of new type has a low frequency and a coupled vibration mode between rotor and caliper through pads. From the experiments, it was made clear that the occurrence of the squeal changes according to the contact distribution in the circumferential and the radial directions between rotor and pads. In the case of cutting a part of pad surfaces in the circumferential direction, it is effective for squeal reduction to cut the pointed end pad surfaces of leading side on the inner side, and in the case of cutting a part of pad surfaces in the radial direction, it is effective for squeal reduction to cut outer pad surfaces of inside in the radial direction. Moreover, frictional vibration of a block subjected to distributed friction at contact surface was treated analytically and experimentally and a common mechanism of vibration of block and disk brake was found.