Actuation and flow control for a valve

Details Actuation and flow control for a valve Actuation and flow control for a valve

1991-08-14

1992-11-10

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Follower type

92 98R, F15B 910

Patent

active

051614537

ABSTRACT:
A method of establishing a spring force for a push rod of a control valve in a brake booster to set the force which opposes an operational input force. After attaching the push rod to a plunger, the plunger is located in the bore of a hub of a movable wall of the brake booster. When the plunger is installed in the bore, a groove located adjacent a threaded end of the push rod extends past the hub. A spring and sleeve are placed on the push rod and a fixture attached to the rear shell of the booster. The push rod and sleeve pass through an opening in the fixture to align the push rod within the axial center of the bore of the hub. A force is applied to the push rod to move the push rod within said bore to establish a rest position of the plunger with respect to a seat on a poppet valve. Thereafter, a force is applied to the sleeve to initially move the sleeve on said push rod to bring the spring into engagement with the hub and thereafter compress the spring until a predetermined spring force is established. When the desired spring force is achieved, a radial force is applied to the sleeve to create detents. The detents are located in the groove in the push rod to retain the spring in this compressed condition. Thereafter, the fixture is removed from the rear shell and an eye member attached to the threaded portion of the push rod. During a brake application, the input force from an operator must overcome spring force before the plunger moves to allow operational fluid to flow past the seat. The plunger has a plurality of axial projections that direct substantially turbulent free flow of operational fluid to a passage connected to a chamber where a pressure differential develops across a wall to create an output force corresponding to the input force.

REFERENCES:
patent: 3316816 (1967-05-01), Yardley
patent: 4622882 (1986-11-01), Bischoff et al.
patent: 4756232 (1988-07-01), Thioux et al.
patent: 4784038 (1988-11-01), Gautier
patent: 5076142 (1991-12-01), Steer et al.

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