Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1995-04-17
1996-10-08
Nguyen, Hoang
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91401, 92 135, 29890124, 29888048, F15B 910, F15B 1522
Patent
active
055620175
ABSTRACT:
An apparatus (10) including a housing (14) defining a chamber (16) and a movable piston (18, 100) dividing the chamber (16) into first and second chamber portions (20, 22). An apparatus (38, 40) directs fluid pressure into either the first or second chamber portion and vents the other to effect movement of said piston (18, 100). A relief valve (12) communicates the first and second chamber portions (20, 22) when the piston (18, 100) is near the end of its work stroke. The relief valve (12) includes a valve member (76) and a valve seat (74) which are relatively movable between open and closed positions. A method is performed to make the apparatus and includes forming a press-fit connection between the piston means (18, 100) and the valve seat (74). The press-fit connection prevents relative movement between the valve seat (74) and the piston (18, 100) during application of force to the valve seat (74) less than a predetermined amount and permits relative movement between the valve seat (74) and said piston (18, 100) during application of force to the valve seat (74) greater than the predetermined amount. Preferably, zinc phosphate (80a) is placed on the valve seat (74) at the connection for resisting seizing of the valve seat (74) and the piston (18, 100) at the connection.
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Nguyen Hoang
TRW Inc.
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