Control system for double acting air motor

Details Control system for double acting air motor Control system for double acting air motor

1974-06-13

1976-03-16

Maslousky, Paul E.

Motors: expansible chamber type

Cyclically operable

Working member controlled motive fluid for distributor motor

91313, 91323, F01L 2506, F01L 1516

Patent

active

039438236

ABSTRACT:
A system for controlling a reciprocable double acting air motor including a pair of power valves for reversing the inlet and exhaust air to and from opposite sides of the piston in the air motor. The control apparatus includes a pair of snap opening pilot valves which are unseated in response to momentary mechanical engagement with the piston of the air motor and which are then pneumatically shifted open so that the energy to effect the pilot valve shift is derived from the air supply line and not from the air motor piston. The return of the pilot valves to the closed position is in response to pressure reversal in the air motor. The power valves each include a pair of chokes, one of which is continuously operable and is of moderate flow restriction and the other of which is intermittently operable and is of high flow restriction. These chokes cooperate to (1) cause completion or reversal of a shift cycle in the event of a loss of the pilot signal during the shift cycle and to (2) stabilize the valve and prevent bounce back from a seated condition. The control apparatus also includes a poppet type pressure regulating valve with self-aligning poppet seals.

REFERENCES:
patent: 1084009 (1914-01-01), Heany
patent: 1161787 (1915-11-01), Nickol
patent: 3540348 (1970-11-01), Pennther
patent: 3635125 (1972-01-01), Rosen
patent: 3771421 (1973-11-01), Scheffer
patent: 3811795 (1974-05-01), Olsen

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