Two stage servomotor with smooth actuation sequence

Details Two stage servomotor with smooth actuation sequence Two stage servomotor with smooth actuation sequence

B - Operations, Transporting

60

T

303/77

B60T 11/16 (2006.01) B60T 11/224 (2006.01) B60T 13/565 (2006.01)

Patent

CA 1041577

ABSTRACT OF THE DISCLOSURE A control valve is activated by a first plunger upon movement of an input bush rod to develop a pressure differential across a movable wall which produces an output force. This output force is carried through a first piston on which a concentric second piston is retained between a first stop and a second stop. A spring urges the second piston toward the first stop in opposition to a first hydraulic pressure developed by the second piston ?ov'?c in a pressurizing chamber. When the first hydraulic pressure is sufficient to hold the second piston against the second stop a ball valve connected to an output chamber is closed. The first hydraulic pressure will unseat the first ball valve until an input force moves a second plunger to proportionally open a poppet valve and allow a po tion of the first hydraulic pressure to escape into a relief chamber. As the first hydraulic pressure is reduced, the movable wall moves the first piston in the output chamber to develop a second hydraulic pressure.

226756

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