Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1985-10-10
1987-03-10
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91401, 91437, 251362, F15B 910, F15B 1522, F15B 1304
Patent
active
046483071
ABSTRACT:
A power assist steering gear for use in vehicles having a housing that defines a chamber. A piston dividing the chamber into first and second chamber portions. The piston is movable through a work stroke in opposite directions in the chamber. A steering valve directs fluid pressure into the first chamber portion and vents the second chamber portion to effect piston movement in a first direction and directs fluid pressure into the second chamber portion and vents the first chamber portion to effect piston movement in a second direction. An input shaft moves to effect actuation of the steering valve. A relief valve for communicates the first and second chamber portions when the piston is near the end of its work stroke. The relief valve has a valve member and valve seat which are movable between a closed position blocking communication between the first and second chambers and a fully open position establishing communication between the first and second chambers when the piston reaches the end of its work stroke. A press-fit connection effects adjustment of, in response to movement of the input shaft, the position in the piston path at which the valve member and valve seat move relatively to an open position.
REFERENCES:
patent: 3092083 (1963-06-01), Sheppard
patent: 3181429 (1965-05-01), Washbond
patent: 3896702 (1975-07-01), Shah et al.
patent: 3896703 (1975-07-01), Bertanza
patent: 3921669 (1975-11-01), Goff
patent: 3935790 (1976-02-01), Goff
patent: 4170925 (1979-10-01), Katz et al.
patent: 4236692 (1980-12-01), Williamson
patent: 4261248 (1981-04-01), Elser et al.
patent: 4367672 (1983-01-01), Elser
Garrett Robert E.
Kapsalas George
TRW Inc.
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