Patent ID: 8382630
Filing Date: 2013-02-26
Classification: F16H

Abstract:
1. A traction drive comprising: a shaft having a central portion, said central portion having a shaft traction surface; a plurality of planetary rollers having a plurality of outer planetary roller traction surfaces that interface with said shaft traction surface to form a first plurality of traction interfaces between said plurality of outer planetary roller traction surfaces and said shaft traction surface that cause rotational mechanical energy to be transferred between said shaft and said plurality of planetary rollers, and a plurality of inner planetary roller traction surfaces that are located radially inwardly from said plurality of outer planetary roller traction surfaces; a ring roller having a ring roller traction surface that interfaces with said plurality of inner planetary roller traction surfaces to form a second plurality of traction surfaces between said inner planetary roller traction surfaces and said ring roller traction surfaces that cause rotational mechanical energy to be transferred between said plurality of planetary rollers and said ring roller; a ring gear disposed on said ring roller that allows rotational mechanical energy to be transferred between said ring roller and a transfer gear.