| 摘要 |
PROBLEM TO BE SOLVED: To ensure strength of a spring and reduce width in the axial direction of the whole spring when improving absorption performance of rotation fluctuation by reducing spring constant. SOLUTION: This power transmission device (a pulley unit 1) transmits power between an outer side ring body (a pulley 2) and an inner side ring body (a rotor shaft 3) arranged coaxially. A planetary rolling body (a planetary gear 16) rolling in a planetary manner in accordance with relative rotation of both ring bodies is provided between both ring bodies. A one end side of the spring (a torsion coil spring 19) is connected to the planetary rolling body, and the other end side is connected to the ring body (the pulley 2) on one side. COPYRIGHT: (C)2006,JPO&NCIPI
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