Power assisted steering unit for motor vehicles

Details Power assisted steering unit for motor vehicles Power assisted steering unit for motor vehicles

1998-10-13

2000-11-21

Hurley, Kevin

Motor vehicles

Steering gear

With fluid power assist

180422, 91437, B62D 506

Patent

active

061489476

ABSTRACT:
To provide a particularly simple and cost effective design of a power-assisted steering unit for motor vehicles for supplying a servo-cylinder (3) with a hydraulic fluid as a function of the travelling speed and the steering rate, comprising a steering valve (1) by means of which the left and right chambers (16, 17) of the servo-cylinder (3) can be pressurized with hydraulic fluid via a pump (2) when there is a steering movement, and a bypass valve (10) connected in parallel to the servo-cylinder (3), by means of which a portion of the hydraulic fluid for pressurizing the servo-cylinder (3) that is directed past the servo-cylinder (3) is controlled, a throttling unit (26) is connected in series with the bypass valve (10). The hydraulic fluid inflow or return flow of the servo-cylinder (3) flows through this throttling unit (26) depending on the steering direction. The throttling unit (26) automatically throttles the flow of hydraulic fluid that is directed through the bypass valve (10) starting from a predetermined value of such volume flow.
Furthermore defined is an assisted-power unit for motor vehicles for supplying hydraulic fluids to a servo-cylinder (3) as a function of the travelling speed, wherein the bypass valve (10) is designed as a proportional valve to achieve a particularly compact and cost effective form of construction.

REFERENCES:
patent: 4513835 (1985-04-01), Fukino et al.
patent: 4830131 (1989-05-01), Miyoshi et al.
patent: 5121807 (1992-06-01), Adams
patent: 5152359 (1992-10-01), Emori et al.
patent: 5452642 (1995-09-01), Dymond
patent: 5755300 (1998-05-01), Lee et al.

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