Hydraulic power steering apparatus

Details Hydraulic power steering apparatus Hydraulic power steering apparatus

1994-09-13

1995-12-12

Hill, Mitchell J.

Motor vehicles

Surface effect vehicles

Dynamic seal or fluid curtain

180141, B62D 506

Patent

active

054741459

ABSTRACT:
A hydraulic power steering system includes a pump, a flow control valve, and a bypass control valve. The flow control valve responds to a pressure drop across a metering orifice disposed in a fluid supply passage so as to control the flow rate of operational fluid by bypassing part of the operational fluid to a reservoir. A spring chamber of the flow control valve is connected to the supply passage through a control orifice. The bypass control valve is disposed between the spring chamber and the reservoir so as to increase the amount of bypassed fluid by controlling the pressure in the spring chamber. The bypass control valve has a control spool, a load pressure introduction port connected to the upstream side of the control orifice for leading the load pressure to a first end of the control spool and a pilot port connected to the downstream side of the control orifice for leading the pressure in the spring chamber of the flow control valve to a second end of the control spool. Moreover, a pressure receiving area of the second end of the control spool is smaller than that of the first end of the control spool. Accordingly, a spring having a small spring constant can be used in the bypass control valve, even when the control spool is controlled within a short stroke.

REFERENCES:
patent: 4332303 (1982-06-01), de Maight
patent: 5147007 (1992-09-01), Kahrs et al.
patent: 5184691 (1993-02-01), Keutner
patent: 5372214 (1994-12-01), Haga et al.
Olhydraulik und Pneumatik, vol. 28, No. 8, Aug. 28, 1984, pp. 493-497, H. W. Krueger, et al., "Modern Lenkhelfpumpen".

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