Fluid handling – Systems – Supply and exhaust
Patent
1975-05-09
1977-06-14
Cohen, Irwin C.
Fluid handling
Systems
Supply and exhaust
91434, F15B 1314
Patent
active
040291243
ABSTRACT:
There is disclosed a control valve arrangement for power steering systems having a servomotor piston which carries a piston valve constructed with a pair of reaction chambers having relief valves and communicating with each other in such a manner as to provide variable resistance against the manual force being applied to a steering wheel which actuates the piston valve. The purpose of thus effecting an automatically varying force is to impart to the vehicle driver a simulated sense of mechanical steering, i.e., simulated road resistance feel, but with a decreasing requirement of force expenditure during vehicle parking operations, or during low speed driving. The construction permits the use of simple parts in a very compact arrangement in which either reaction chamber imparts road resistance feel by being subjected only to servopump inlet pressure while the other is subjected to exhaust pressure. The unbalance of force acts on the piston valve in a direction opposite the manually impressed force. However, both reaction chambers have relief valves, biased closed, but exposed upstream to inlet pressure. Should that pressure exceed a certain limit, the reaction chamber under exhaust pressure will have an inlet pressure feed mixing with exhaust pressure to effect a force opposing the road resistance force of the other reaction chamber. Thus, manual steering effort during parking or driving at slow speeds is decreased even though servomotor pressure may increase.
REFERENCES:
patent: 2362945 (1944-11-01), Stephens
patent: 2865339 (1958-12-01), Bishop
patent: 2919681 (1960-01-01), Schultz
patent: 3602101 (1971-08-01), Jablonsky et al.
Elser Dieter
Keller Manfred
Cohen Irwin C.
Zahnradfabrik Friedrichshafen AG
LandOfFree
Power steering control valve does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Power steering control valve, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Power steering control valve will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4753