| 摘要 |
In order to effectively damp the vibration of the drum (1) of a drum brake, which is a main cause of brake squeals, a vibration detector and a vibrator are provided and operated separately from each other. The vibration damping control is carried out directly by mechanical means, or in a non-contact manner to improve durability of the device. A piezoelectric element (7), magnetic sensor (19) or acceleration sensor (22) is used to detect the vibration of the drum (1). The vibration detected is converted to an electric signal. After adjusting its phase and amplitude, the electric signal is converted to vibration force and output through a piezoelectric element (7,7') or magnetic actuator (28) as the vibrator to suppress brake squeals. |
