| 摘要 |
A blade-type chain tensioner (10, 110) is provided including a shoe (30, 130) adapted to impart tension to a chain (16), a blade spring (28, 128) engaging the shoe (30, 130), a piezoelectric strain element (35, 135) coupled to the blade spring (28, 128) or the shoe (30, 130), and a circuit (34, 137) adapted to receive a voltage or voltage data signal generated by a sensor (33, 133) coupled to the blade spring and shoe assembly (28/30, 128/130) in response to a vibration having a predetermined frequency or frequency band occurring in the blade spring and shoe assembly (28/30, 128/130), wherein the circuit (34, 137) is adapted to operably interact with the piezoelectric strain actuator element (35, 135) to induce a vibratory moment therein effective to reduce the vibration of the chain tensioner (10, 110). The piezoelectric strain element (35, 135) and the circuit (34, 137) can be configured as a passive damping system (10) or an active damping system (110), according to different aspects of the invention. The chain tensioners (10, 110) of this invention have excellent tensioning and vibrational damping performance capabilities.
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