Compact valve actuator

Details Compact valve actuator Compact valve actuator

1989-01-06

1991-02-12

Myhre, Charles J.

Internal-combustion engines

Poppet valve operating mechanism

Pneumatic system

123 9024, 13762564, 91459, 91465, 92 85B, 251 635, F01L 902

Patent

active

049915487

ABSTRACT:
A pneumatically powered valve actuator is disclosed including a valve actuator housing, a main piston reciprocable within the housing along an axis and a pair of auxiliary pistons fixed to and movable with the main piston. The main piston has a pair of oppositely facing primary working surfaces. A pair of air control valves reciprocable along said axis relative to both the housing and the main piston between open and closed positions control air flow from a pressurized source causing the main piston and the pair of auxiliary pistons to move. Each auxiliary piston forms, in conjunction with a surface of the corresponding air control valve, a variable volume annular chamber. The variable volume chamber function during the early portion of piston movement to apply a reclosing force to the air control valve and during a latter portion of the piston movement to vent air compressed by the piston during damping. This venting of the residual air is in an axial rather than a radial direction.

REFERENCES:
patent: 4582082 (1986-04-01), Tosseghini
patent: 4741364 (1988-05-01), Stoss et al.
patent: 4742989 (1988-05-01), Akagi
patent: 4777915 (1988-10-01), Bonvallet
patent: 4809587 (1989-03-01), Kawahara et al.

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