| 摘要 |
PURPOSE:To reduce the noise by constituting a reduction apparatus from the connection in series in multistages of planetary frictional roller type reduction apparatuses and making different each other the number of the planetary rollers of each planetary frictional roller type reduction apparatus. CONSTITUTION:A reduction apparatus 4 is constituted of the connection in series in multistages consisting of a planetary frictional roller type reduction apparatuses, and each number of the planetary rollers 16 and 21 of each planetary frictional roller type reduction apparatus is made different. Therefore, the generation of the vibration due to the synchronization of the planetary rollers 16 and 21 in frictional transmission is prevented, and the exceedingly quiet power transmission is permitted.
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