Motor vehicles – Surface effect vehicles – Dynamic seal or fluid curtain
Patent
1995-06-07
1996-04-23
Focarino, Margaret A.
Motor vehicles
Surface effect vehicles
Dynamic seal or fluid curtain
180147, 91374, 74388PS, B62D 506
Patent
active
055094945
ABSTRACT:
In an auxiliary power steering intended especially for motor vehicles, a pinion (2) positioned in a steering housing (1) engages a steering rack (9). A steering valve (14) that is used to control the pressure medium for the auxiliary power steering provides two inlet-seat valves (15, 16) and two outlet-seat valves (17, 18) whose closing bodies (20, 21, 35, 36) can be shifted in the axial direction by a rotary movement of a steering spindle. Closing bodies (20, 21) of inlet-seat valves (15, 16) can be biased in the closing direction by the force of pressure springs (22, 23). In the process, pressure springs (22, 23) bias the closing bodies (20, 21) of inlet-seat valves (15, 16) only if the particular outlet-seat valves (17, 18) are in their neutral position. Each pressure spring (22, 23)--when steering valve (14) is in the neutral position--keeps closing body (20, 21) of the particular inlet-seat valve (15, 16) resting against a valve seat (26, 27) that is fixed on the housing. When steering valve (14) is shifted from its neutral position, then one of the outlet-seat valves (17, 18) in each case will lift the pressure spring (22, 23) of the particular inlet-seat valve (15, 16) over the disc (24, 25) and off the closing body (20, 21) of inlet-seat valve (15, 16).
REFERENCES:
patent: 4627510 (1986-12-01), Camus
patent: 4699231 (1987-10-01), Lang et al.
patent: 5147007 (1992-09-01), Kahrs et al.
Focarino Margaret A.
Johnson Victor E.
ZF Friedrichshafen AG
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