Hydraulic control for hydromechanical transmission

Details Hydraulic control for hydromechanical transmission Hydraulic control for hydromechanical transmission

1976-11-01

1978-09-05

Scott, Samuel

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74877, B60K 2100

Patent

active

041110749

ABSTRACT:
A power transmission that includes hydraulically-operated clutches that are electively supplied with operating fluids by a selector valve that is controlled by an error signal means constructed to compare prime mover speed and user demand speed. The transmission preferably is a split torque hydromechanical transmission having one power path going through a hydrostatic pump-motor unit and another path going only through epicycloidal gearing system containing the hydraulically-operated clutches. The transmission is controlled hydraulically rather than mechanically, thereby avoiding problems relating to mechanical slack, response lag, and reliability.

REFERENCES:
patent: 3733931 (1973-05-01), Nyman
patent: 3903756 (1975-09-01), Hamma

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