Pneumatically powered actuator with hydraulic latching

Details Pneumatically powered actuator with hydraulic latching Pneumatically powered actuator with hydraulic latching

1992-05-05

1993-11-09

Wolfe, Willis R.

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

123 9014, 91 42, 91 44, F01L 902, F15B 1526

Patent

active

052593452

ABSTRACT:
An axially reciprocable working piston has opposed working surfaces facing opposed working chambers which are intermittently connected to respective cavities pressurized with compressed air. The working piston is connected to opposed seating pistons which cut off the connection between the cavity and working chamber behind the advancing piston and establish the connection in front of the piston, thereby conserving compressed air and storing potential energy for return movement of the piston. In either of two stable positions the working piston is hydraulically latched by fluid admitted to a respective chamber from another chamber through a two-way check valve. The check valve is electronically switched on commend to reverse the flow direction of the hydraulic fluid, thereby initiating movement between opposed stable positions.

REFERENCES:
patent: 4843951 (1989-07-01), Bruggen et al.
patent: 4872425 (1989-10-01), Richeson et al.
patent: 4915015 (1990-04-01), Richeson et al.
patent: 4942852 (1990-07-01), Richeson et al.
patent: 5003938 (1991-04-01), Erickson et al.
patent: 5022359 (1991-06-01), Erickson et al.
patent: 5109812 (1992-05-01), Erickson et al.
patent: 5152260 (1992-10-01), Erickson et al.
patent: 5161449 (1992-11-01), Everett, Jr.

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