Positive-displacement fluid motor having self-stopping function,

Details Positive-displacement fluid motor having self-stopping function, Positive-displacement fluid motor having self-stopping function,

1987-07-27

1988-11-22

Look, Edward K.

Motors: expansible chamber type

Three or more cylinders arranged in parallel radial or...

Radially disposed cylinders

91499, 60327, F01B 106

Patent

active

047857145

ABSTRACT:
A positive-displacement fluid motor wherein a rotating member rotated by pressurized fluid flows to and from fluid chambers can be stopped at a desired one of at least one predetermined angular position by a torque produced by the motor itself. The fluid is supplied into at least one advancing fluid chamber of the fluid chambers which acts to rotate the rotating member in an operating direction of the motor, while causing the fluid to be discharged from at least one reversing fluid chamber of the fluid chambers which acts to rotate the rotating member in a direction opposite to the operating direction, if a motor stop command is generated when the desired angular position is ahead of a current position of the rotating member in the operating direction of the motor. The fluid is supplied into the at least one reversing fluid chamber while causing the fluid to be discharged from the at least one advancing fluid chamber, if the motor stop command is generated when the current position of the rotating member is ahead of the desired angular position in the operating direction of the motor. The rotating member functions to control the fluid flows into and from the advancing and reversing fluid chambers, depending upon the current position of the rotating member relative to the desired angular position.

REFERENCES:
patent: 4631010 (1986-12-01), Petersen et al.
patent: 4704946 (1987-11-01), Okada

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