Hydrostatic transmission with automatic displacement shifter

Details Hydrostatic transmission with automatic displacement shifter Hydrostatic transmission with automatic displacement shifter

1976-03-25

1977-08-09

Peters, Jr., Joseph F.

Power plants

Pressure fluid source and motor

Having condition responsive control in a system of distinct...

60484, 180 648, B62D 1104

Patent

active

040402541

ABSTRACT:
A hydrostatic transmission system is provided which is particularly well adapted for use in driving vehicles employing skid-steer drives. In the system disclosed two independent hydrostatic transmissions, each employing a variable displacement motor are utilized; and a pressure responsive valve is employed to sense the magnitude of the load on each of the motors and to permit shifting the motors from minimum displacement toward maximum upon the sensing of a load in excess of a predetermined valve. The variable displacement motors of the system are configured to create forces during operation tending to urge the motors to maximum displacement, and the pressure responsive valve operates to bias the motors to minimum displacement when they are loaded at a magnitude less than the predetermined valve.

REFERENCES:
patent: 2161439 (1939-06-01), Thoma
patent: 2941365 (1960-06-01), Carlson
patent: 3186170 (1965-06-01), Gauthier et al.

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