Power plants – Pressure fluid source and motor – Input pump and rotary output motor system having...
Patent
1976-10-06
1978-02-28
Geoghegan, Edgar W.
Power plants
Pressure fluid source and motor
Input pump and rotary output motor system having...
60489, 91499, F15B 1518, F16H 3946
Patent
active
040758435
ABSTRACT:
A hydraulic transmission operates throughout a continuous range between a neutral condition and a direct drive one to one ratio of input shaft speed to output shaft speed. The input shaft carries a rotor which provides a hydraulic pump for the input side of the transmission. Reciprocating pistons of the input pump move in camming fashion against an input side swash plate as the input shaft rotates. The fluid that is displaced in the input side pump is directed into an output side pump which is carried on the output shaft. Reciprocating pistons of the output pump are hydraulically forced against an output side swash plate to effect rotation of the output shaft. A sleeve and lever assembly controls the stroke length of the pistons of the input pump in order to vary its fluid displacement relative to that of the output pump, thereby varying the transmission ratio. Each swash plate presents a pair of flat camming surfaces which are angled relative to one another in order to maintain a balanced torque condition with respect to the transmission axis. In an alternative embodiment of the invention, the swash plates are carried on the respective shafts and the pumps are interlocked with one another for rotation in unison.
REFERENCES:
patent: 2907230 (1959-10-01), Kollmann
patent: 3313108 (1967-04-01), Allgaier
patent: 3362161 (1968-01-01), Flint
patent: 3698189 (1972-10-01), Reimer
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