Motors: expansible chamber type – Working member position responsive motive fluid control – Exhaust control
Patent
1998-04-02
2000-03-21
Ryznic, John E.
Motors: expansible chamber type
Working member position responsive motive fluid control
Exhaust control
91452, F16D 3102
Patent
active
060389567
ABSTRACT:
A dynamic pressure regulator cushion for use with a fluid power actuator to smoothly and linearly decelerate the piston at end of stroke. The dynamic pressure regulator cushion comprises a pressure sensor attached to a valve. A side of the pressure sensor tending to close the valve is exposed to driving pressure. A side of the pressure sensor tending to open the valve is exposed to fluid pressure in the cylinder ahead of the piston. An adjustable valve pre-loading is provided to maintain the fluid pressure in the cylinder ahead of the piston at a constant, pre-determined level above the driving pressure during the cushion stroke. This pre-set pressure differential across the piston serves to smoothly and linearly decelerate the piston to near zero at end of stroke. Two pressure sensor embodiments taught are a pressure sensor piston reciprocating within a plenum, and a diaphragm whose outer edge is attached to, and sealed to, an inside wall of a plenum. Means are disclosed to relieve fluid pressure in the cylinder ahead of the piston at end of stroke, so as to allow full actuator holding pressure on the piston at end of stroke.
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Rooy Paul S.
Ryznic John E.
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