Machine element or mechanism – Gearing – Follow-up mechanism
Patent
1985-09-30
1987-09-29
Husar, Cornelius J.
Machine element or mechanism
Gearing
Follow-up mechanism
180132, 137596, 91370, F15B 910
Patent
active
046961984
ABSTRACT:
A power-assist device for an automotive steering system employs spool valves of substantially identical construction and identical size to control the fluid pressure in smaller and larger area chambers of an unbalanced cylinder. For compensating difference of effective area between smaller and larger area chambers, the position of bores defned in a housing of a pressure control valve for receiving the spool valves are differed from each other so that the spool valve opening and closing an induction path for the smaller area chamber and opening closing a drain path for the larger area chamber moves at greater magnitude than that of the other spool valve which opens and closes an induction path for the larger area chamber and opens and closes an exhaust path for the smaller area chamber. By this valve arrangement, a wider path area is provided for introducing a larger amount of working fluid into the smaller area chamber in comparison with that into the larger area chamber and a narrower path area is provided for draining the smaller amount of working fluid in the smaller area chamber than that for the larger area chamber. By utilizing spool valves of identical constructions, mis-assembling can be completely avoided. This requires substantially lesser attention that that conventionally required. In addition, by applying the identical spool valves, manufacturing cost of the spool valves can be lowered at a significant level.
REFERENCES:
patent: 3978770 (1976-09-01), Strauff
patent: 4344284 (1982-08-01), Lang
Atsugi Motor Parts Company Limited
Fischetti Joseph A.
Husar Cornelius J.
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