It is one of the most important issues to reduce brake squeal in brake development. Brake squeal is classified in two kinds of vibration mode of the disc. One is out-of-plane mode which vibrates in out-of plane direction of disc. The other is in-plane mode which vibrates in circumferential or radial direction of the disc. For out-of-plane mode, a number of existing countermeasures can be potentially applied after characterization of the squeal occurrence condition by direct experiment or simulation analysis. On the other hand, in-plane mode, is occurred under high frequency, often involves the tangential (also called circumferential or longitudinal) vibration modes of brake rotor. Therefore, the characterization of the squeal occurrence condition has not been completely understood and still remains as one of important issues in the automotive industry due to it is much complicated mechanisms. In this paper, we show the experimental analysis results of the vibration mode of parts in a brake system while squeal is occurring when the disc vibrates in in-plane mode. And we consider a generating mechanism of brake squeal and countermeasure logic of reduction for disc inplane mode brake squeal.

Ryutaro, Misumi; Toru, Matsushima; - Toyota Motor Corporation