HYDRAULIC CONTROL MEANS
First Claim
1. A control device for controlling operation of a hydraulic motor deVice having first and second passage means and operating in one direction when fluid under pressure is allowed to flow to one of the passage means and exhaust from the other and operating in an opposite direction to said one direction when fluid under pressure is allowed to flow to said other passage means and exhaust from said one of the passage means, and being prevented from operating in either direction when fluid flow through both passage means is prevented, said control device including:
- body means having inlet means connectible to a source of fluid under pressure and fluid outlet means;
a control valve assembly for selectively transmitting fluid under pressure from said inlet means to one of said flow passages of a hydraulic motor device permitting flow of fluid from the motor device from its other flow passage means to said outlet means, and preventing flow through both of said flow passage means, and a deactivating valve assembly operatively associated with said control valve assembly and said motor device responsive to the malfunction of said control valve assembly for providing a bypass flow passage between said passage means of the motor device upon malfunction of the control valve assembly, said body means having first and second passages in communication with said first and second flow passage means of said motor device, and a valve member movable in said body means for selectively placing said first and second flow passages in communication with said inlet and outlet means and preventing fluid flow between said first and second flow passages;
said control valve assembly including a control member operatively associated with and movable relative to said valve member, and piston means operatively associated with said control member and said valve member and biased by hydraulic pressure from said inlet means for exerting a force on said valve member tending to cause said valve member to move with said control member, said control member and said valve member having passage means communicating said inlet means with said deactivating valve assembly upon movement of said control member relative to said valve member to actuate said deactivating valve assembly when the movement of said valve member is resisted by a force greater than the force exerted thereon by said piston means.
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Accused Products
Abstract
A hydraulic control device for controlling the operation of a reversible hydraulic motor device, such as a hydraulic ram, which has a deactivating valve assembly which provides a fluid bypass passage across the fluid inlet and passages of the ram cylinder to render the hydraulic ram inoperative in the event of malfunction of the control device. An apparatus for operating a controlled member, such an aileron, spoiler or the like, of an aircraft which includes a plurality of hydraulic motor devices having separate control means for individually controlling the motor devices, the control devices having means for deactivating the motor devices upon the malfunction of the control devices so that the motor device whose control device has malfunctioned or is inoperative will not impede the operation of the controlled member by the other motor devices whose control devices still function properly.
29 Citations
5 Claims
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1. A control device for controlling operation of a hydraulic motor deVice having first and second passage means and operating in one direction when fluid under pressure is allowed to flow to one of the passage means and exhaust from the other and operating in an opposite direction to said one direction when fluid under pressure is allowed to flow to said other passage means and exhaust from said one of the passage means, and being prevented from operating in either direction when fluid flow through both passage means is prevented, said control device including:
- body means having inlet means connectible to a source of fluid under pressure and fluid outlet means;
a control valve assembly for selectively transmitting fluid under pressure from said inlet means to one of said flow passages of a hydraulic motor device permitting flow of fluid from the motor device from its other flow passage means to said outlet means, and preventing flow through both of said flow passage means, and a deactivating valve assembly operatively associated with said control valve assembly and said motor device responsive to the malfunction of said control valve assembly for providing a bypass flow passage between said passage means of the motor device upon malfunction of the control valve assembly, said body means having first and second passages in communication with said first and second flow passage means of said motor device, and a valve member movable in said body means for selectively placing said first and second flow passages in communication with said inlet and outlet means and preventing fluid flow between said first and second flow passages;
said control valve assembly including a control member operatively associated with and movable relative to said valve member, and piston means operatively associated with said control member and said valve member and biased by hydraulic pressure from said inlet means for exerting a force on said valve member tending to cause said valve member to move with said control member, said control member and said valve member having passage means communicating said inlet means with said deactivating valve assembly upon movement of said control member relative to said valve member to actuate said deactivating valve assembly when the movement of said valve member is resisted by a force greater than the force exerted thereon by said piston means.
- body means having inlet means connectible to a source of fluid under pressure and fluid outlet means;
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2. The control device of claim 1, wherein said valve member comprises a tubular valve spool having a central longitudinal bore therein and said control member includes a rod longitudinally slidable in said bore of said valve spool, said piston means comprising a pair of longitudinally spaced tubular pistons, said pistons and said valve spool and said control member having co-engageable means limiting longitudinal movement of said piston means relative to said control member and said valve spool.
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3. The control device of claim 2, wherein said co-engageable means permit limited longitudinal movement of said pistons relative to said valve spool and said rod.
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4. The control device of claim 3, and means responsive to the actuation of said deactivating valve assembly for providing a signal at a location remote from said control device.
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5. The control device of claim 1, and means responsive to the actuation of said deactivating valve assembly for providing a signal at a location remote from said control device.
Specification