Variable speed transmission and transaxle

Planetary gear transmission systems or components – Fluid drive or control of planetary gearing – Control of differential planetary gearing

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475 72, 475 78, 475 94, 418 613, F16H 4704

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058608842

ABSTRACT:
A variable speed transmission or transaxle that utilizes a pump for variable braking of the output shaft or axle. A rotatable input shaft connectable to a drive source extends into a transmission housing and is operatively connected to a gear train that transmits rotational power to a transmission output shaft. A gerotor pump mounted within the housing utilizes a ring gear of an epicyclic gear of the gear train as an inner gerotor gear that meshes with an outer gerotor gear to pump fluid along a fluid conduit. By adjustably varying the resistance of the pump, the revolution rate of the epicyclic ring gear is adjusted which in turn results in a controlling of the speed of rotation of the transmission output shaft. In an alternate embodiment, a reversible transmission is provided by employing two gerotor pumps and two gear trains which allow forward and reverse speeds of rotation of the output shaft to be variably controlled.

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"Gear Pumps", Pumping Manual, 7th Edition, Published 1984 by Gulf Publishing Company, Houston, Texas, pp. 124, 125 and 127.

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