DISC BRAKE

摘要

Brake noise (unpleasant squealing noise) caused when applying a brake is effectively reduced. A weight is mounted via an elastic body on a vibrating member (brake pad, piston, caliper) of a disc brake for applying a brake force by holding a disc rotor from the sides thereof with two brake pads. The weight vibrates on receiving vibration from the brake pads because the weight is mounted on the vibrating member via the elastic body. The vibration of the weight has a low frequency and its phase is the same as that of the vibration of a brake pad. However, as the vibration frequency of a brake pad increases, the vibration phase of the weight starts to deviate from the vibration phase of a brake pad accordingly. The phase difference becomes almost 180 degrees when the frequency becomes close to or greater than a certain frequency. The vibration of a brake pad can be suppressed by the vibration of the weight by matching the certain frequency to the frequency of the brake squeal. It is possible to reduce the brake squeal of a large vehicle having disc brakes of a large size to a practically sufficient level only by adding inexpensive parts, thereby making it possible to maintain its original performance even after replacing brake pads.