Power plants – Pressure fluid source and motor – Condition responsive control of motive fluid flow
Patent
1988-11-04
1990-09-25
Look, Edward K.
Power plants
Pressure fluid source and motor
Condition responsive control of motive fluid flow
91 49, 91417R, 91420, 91422, F15B 13042
Patent
active
049584952
ABSTRACT:
A hydraulic differential cylinder comprises a cylinder, a piston slidably fitted in a cylinder chamber, a piston rod with one end coupled to said piston and an inner valve disposed in said piston rod. The cylinder chamber is divided by the piston into a rod-side cylinder chamber and a head-side cylinder chamber. The piston-pressure-bearing area of the head-side cylinder chamber is greater than the piston-pressure-bearing area of the rod-side cylinder chamber. The rod-side cylinder chamber is connected via the inner valve to a constant hydraulic pressure source. The head-side cylinder chamber is connected to a control hydraulic pressure source. The inner valve has means for communicating the constanbt hydraulic pressure source with the rod-side cylinder chamber when the hydraulic pressure of the working fluid supplied from the control hydraulic pressure source to the head-side cylinder chamber is lower than a critical hydraulic pressure, and for shutting off the communication between the constant hydraulic pressure source and the rod-side cylinder chamber and for communicating the rod-side cylinder chamber with a drain when the hydraulic pressure of the working fluid supplied from the control hydraulic pressure source to the head-side cylinder chamber is higher than the critical hydraulic pressure.
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Honda Giken Kogyo Kabushiki Kaisha
Kapsalas George
Look Edward K.
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