| 摘要 |
A planetary gear system within a vehicle wheel has a sun gear at the wheel axis driven by a fluid motor and further includes a ring gear secured to the wheel rim. Planet gears, engaging both the sun gear and ring gear, are mounted on a carrier which is revolvable as the planet gears orbit around the sun gear while transmitting drive from the motor to the wheel with a speed reduction and a corresponding torque amplification. The carrier is not tightly restrained in either the radial or axial direction enabling positional self-adjustment to relieve stress concentrations at gear teeth. Limits for the axial and radial play of the floating carrier are fixed by positioner means defining an annular groove into which the radially innermost edge of the carrier is loosely received, thrust bearing means such as thrust pins or annular thrust rings being situated within the groove at each side of the carrier edge. Situating the positioner means at the minimum diameter portion of the carrier minimizes friction, wear, power dissipation and heating as that portion of the carrier turns at a smaller velocity than the more outward portions of the carrier.
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