Motors: expansible chamber type – Working member position feedback to motive fluid control – Follower type
Patent
1983-05-10
1984-11-20
Garrett, Robert E.
Motors: expansible chamber type
Working member position feedback to motive fluid control
Follower type
91380, F15B 912
Patent
active
044832370
ABSTRACT:
A control valve in a power boost steering system uses hydraulic power for wheel straightening after a steering operation wherein a valve spool is reciprocal with a worm shaft which has an end threadedly carrying a non-rotative but slidable collar to compress springs as the worm shaft is rotated by virtue of being keyed against rotation. Thus, rotation of the worm shaft can actuate the collar axially in either direction against oppositely disposed compression springs depending on direction of steering rotation of the worm shaft by a manually operated steering spindle. When manual steering force on the steering spindle is released, the compressed spring expands to axially move the worm shaft and thus the valve spool through a neutral position which exhausts the cylinder chambers. However, the continued expansion of the compressed spring moves the valve spool to a position whereat pressure flow and exhaust of the cylinder chambers is reversed from the original steering direction. This reversal provides hydraulic power to straighten the vehicle wheels to straight ahead position.
REFERENCES:
patent: 2193898 (1940-03-01), Carter et al.
patent: 2237400 (1941-04-01), Washburn
patent: 2340029 (1944-01-01), Weingartner
patent: 3828883 (1974-08-01), Rist
patent: 3844177 (1974-10-01), Bourassa
patent: 3964371 (1976-06-01), Wagner et al.
patent: 4008782 (1977-02-01), Chanal
Bradley Abram McConnell
Garrett Robert E.
Zahnradfabrik Friedrichshafen AG.
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