| 摘要 |
An on/off type T/V damper of a crank train for a vehicle is provided to minimize vibration of an upper end of the crank train, and to satisfy a design guideline of the T/V damper. An on/off type T/V damper(16) of a crank train for a vehicle comprises a bearing(24), an assistant ring(22), friction material(32,34), a hydraulic supply unit and a hydraulic control circuit unit. The bearing is mounted in an external diameter of a hub shaft and an external diameter surface of a sprocket(12). The assistant ring has an upper end mounted in an inner circumferential surface of the ring so as to reciprocate along a shaft direction, and a lower end formed to be tightly attached to an inner circumferential surface of a hub(14). The friction material is attached to the inner circumferential surface of the hub and one surface of the lower end of the assistant ring facing it. The hydraulic supply unit pressurizes the other surface of the lower end of the assistant ring with hydraulic power. The hydraulic control circuit unit controls the hydraulic supply unit.
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