| 摘要 |
A rotary device, for example in the form of a gear wheel, comprises a hub ( 2 ) and an outer element ( 4 ) carrying teeth ( 28 ). The outer element ( 4 ) is provided with resilient fingers ( 20 ) which frictionally engage cam surfaces ( 38 ) provided on the hub ( 2 ). Relative rotation between the hub ( 2 ) and the outer element ( 4 ) is resisted by deflection of the fingers ( 20 ). Relative rotation between the hub ( 2 ) and the outer element ( 4 ) is limited by engagement between projections ( 32 ) and recesses ( 34 ). A combination of torsional spring force created by the flexible fingers together with friction between the fingers ( 20 ) and the cam surfaces ( 38 ) and between the recesses ( 46 ) and the projections ( 32 ) provide a damping effect which serves to limit the transmission of torsional vibrations between the hub ( 2 ) and the outer element ( 4 ).
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