324 中空無心軸型遊星ローラ減速機の接触部の伝達係数(OS11-2 トラクションドライブ・CVT II)

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  • 324 Coefficient of traction on the contacts of a planetary roller type speed reducer with a centerlessly supported hollow cylinder

説明

A noble planetary roller type traction drive with the speed ratio of 4.5 was developed as a speed reducer aiming at simplification and high efficiency of the device. The power was transmitted from the sun roller to the retainer through the centerlessly supported planetary roller, which enables to decrease a precision of processing of the rollers. Another feature was that the axial thrust between the wedge-shaped sun and planetary rollers provide the normal force. The power transmission performance was evaluated using the traction fluid under the test conditions taken a speed reducer of electric-powered wheel chair into consideration. As a result, the reduction speed ratio was stable under the test conditions, while the efficiency was about 90% at the maximum output torque. It was considered that the major cause of torque loss was the friction resistance on the bearings.

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