Speed override control for hydraulic motors

Details Speed override control for hydraulic motors Speed override control for hydraulic motors

1975-02-28

1976-08-03

Freeh, William L.

Power plants

Pressure fluid source and motor

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

60427, 91492, 60483, F16D 3102, F16D 3900

Patent

active

039721868

ABSTRACT:
A hydraulic system including a source of pressurized fluid and a multi-speed motor with a directional control valve for selectively directing fluid to the motor for forward and reverse operation thereof and a speed control valve operative to control the flow of the fluid to the motor for selective control of the speed thereof is provided with an override control valve that is operative to override the speed control valve under heavy load conditions to shift the speed control valve to a low-speed high-torque position for low-speed high-torque operation of the hydraulic motor.

REFERENCES:
patent: 2749709 (1886-06-01), Vestre
patent: 3473442 (1969-10-01), Farmer
patent: 3593621 (1971-07-01), Praddaude
patent: 3610507 (1971-10-01), Kiwalle
patent: 3757524 (1973-09-01), Poyner
patent: 3759042 (1973-09-01), Shioda et al.
patent: 3768263 (1973-10-01), Olson
patent: 3863447 (1975-02-01), Foster

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