| 摘要 |
A torsional damper comprises a pulley hub fixed to a rotary shaft such as the crank shaft of an engine or the like, and a damper mass fixed, by means of a damping rubber, in a cavity formed in the front portion of the pulley hub. A projection is provided on the outer circumference of the damper mass, and a groove is formed in the pulley hub oppositely to the projection to receive a part of the projection.
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