Motors: expansible chamber type – Relatively movable working members with one having motive... – Single valve unit controlling plural working chambers
Patent
1976-03-03
1978-02-21
Maslousky, Paul E.
Motors: expansible chamber type
Relatively movable working members with one having motive...
Single valve unit controlling plural working chambers
91186, 91275, 92137, 92 68, F01B 900, F01L 2508, F01L 3304
Patent
active
040746119
ABSTRACT:
The actuator includes two piston motors interconnected in opposed driving relation with a fixed axis rotary shaft, and fluid pressure control means for controlling the piston motors so that they rotate the shaft bi-directionally at constant rotational velocity with constant resultant torque. The two piston motors preferably are of different effective cross sectional areas, the smaller motor being continuously pressurized with fluid composed solely of fluid from a fluid pressure source, and the larger motor being selectively pressurized with fluid made up of fluid from the fluid pressure source together with fluid exhausted from the smaller motor. A single valve controls fluid flow to and from the piston motors to effect bi-directional shaft rotation, or maintain the shaft in a fixed position. The valve may be operated automatically by servo control means responsive to the positions of the piston motors.
REFERENCES:
patent: 204828 (1878-06-01), Jenkins
patent: 2668450 (1954-02-01), Crookston et al.
patent: 2875734 (1959-03-01), Winters et al.
patent: 3030931 (1962-04-01), Baxter et al.
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