Multiple displacement motor driven power drive unit

Details Multiple displacement motor driven power drive unit Multiple displacement motor driven power drive unit

1984-02-14

1985-12-03

Freeh, William L.

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Cylinders parallel to rotation axis

417216, 74655, 74661, 74675, F01B 1304, F16H 3706

Patent

active

045559783

ABSTRACT:
A multiple displacement motor driven power drive unit having two separate hydraulic systems each with a variable displacement hydraulic motor having its output connected to a torque summing gear train. A control provides for operation of one or the other of the motors at full displacement while the other motor is at zero displacement and free-wheels. There is a manual mechanical control operation with both motors simultaneously set at one-half of full displacement and driving the torque summing gear train. The change in motor displacements to one-half full displacement accomplishes velocity summing within the hydraulics. The multiple displacement motor driven power drive unit accomplishes the power efficiency of a multiple motor driven power drive unit utilizing a speed summing gear train with fixed displacement motors, but without the complexities associated with the use of a speed summing gear train and brakes.

REFERENCES:
patent: 3535984 (1970-10-01), Anderson
patent: 3662550 (1972-05-01), Lichtfuss
patent: 3694108 (1972-09-01), Pensa
patent: 3977302 (1976-08-01), Eickmann
patent: 4155288 (1979-05-01), Glaze
patent: 4191094 (1980-03-01), Flippo
patent: 4210066 (1980-01-01), Aldrich

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