Hydromechanical transmission with two planetary assemblies that

Details Hydromechanical transmission with two planetary assemblies that Hydromechanical transmission with two planetary assemblies that

1977-07-07

1979-01-16

Gerin, Leonard H.

Machine element or mechanism

Elements

Gear casings

F16H 4704

Patent

active

041343115

ABSTRACT:
A power transmission having two planetary assemblies, each having its own carrier and its own planet, sun, and ring gears. A speed-varying module is connected in driving relation to the input shaft and in driving relationship to the two sun gears, which are connected together. The speed-varying means may comprise a pair of hydraulic units hydraulically interconnected so that one serves as a pump while the other serves as a motor and vice versa, one of the units having a variable stroke and being connected in driving relation to the input shaft, the other unit, which may have a fixed stroke, being connected in driving relation to the sun gears. A brake grounds the first carrier in the first range and in reverse and causes drive to be delivered to the output shaft through the first ring gear in a hydrostatic mode, the first ring gear being rigidly connected to the output shaft. The input shaft also is clutchable to either the carrier or the ring gear of the second planetary assembly. The output shaft is also clutchable to the carrier of the second planetary assembly when the input is clutched to the ring gear of the second planetary assembly, and is clutchable to the ring gear of the second planetary assembly when the input is clutched to the carrier thereof.

REFERENCES:
patent: 3888139 (1975-06-01), Orshansky, Jr.
patent: 4008628 (1977-02-01), Orshansky, Jr.

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