Damper valve for hydraulic power steering device

Details Damper valve for hydraulic power steering device Damper valve for hydraulic power steering device

1999-10-05

2000-12-26

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

1374938, 1374939, F16K 1718

Patent

active

061643203

ABSTRACT:
A damper valve for a hydraulic power steering device is disposed in a hydraulic oil circuit connecting an oil passage changing-over valve in a gear box and left and right oil chambers of a power cylinder. It is provided with a piston valve which is opened by through-flow of hydraulic oil returned back to the oil passage changing-over valve from either one of the left and right chambers of the power cylinder, and a check valve which is disposed in a valve body of the piston valve and which allows only hydraulic oil supplied from the oil passage changing-over valve to either one of the left and right chambers of the power cylinder to flow through the check valve. The piston valve is structured such that a throttle oil passage is formed by through flow of the returned hydraulic oil having an oil pressure of a predetermined value or less, and a fully opened oil passage is formed by through flow of the returned hydraulic oil having an oil pressure of more than the predetermined value. Oil passages for the returned-back hydraulic oil are formed in the valve body of the piston valve.

REFERENCES:
patent: 2014162 (1935-09-01), Benedek et al.

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