Rotary servovalve for power-assisted steering system
A rotary servovalve is described adapted for use in combination with a hydraulic power cylinder of a power-assisted steering system, comprising: a valve sleeve formed in a peripheral wall thereof with a supply port for connection to a source of fluid under pressure and distribution ports respectively for connection to opposite fluid chambers of the power cylinder, the valve sleeve being formed at the inner periphery thereof with circumferentially spaced sleeve channels respectively in open communication with the supply and distribution ports; and a valve rotor coupled within the valve sleeve for relative rotation thereto, the valve rotor being formed thereon with circumferentially spaced control lands which are arranged to correspond with the sleeve channels when the servovalve is in a neutral position; wherein the control lands corresponding with the sleeve channels in open communication with the distribution ports are each formed larger in width than the corresponding sleeve channel and smaller in height than the control land corresponding with the sleeve channel in open communication with the supply port to define a predetermined clearance for restricting the flow of fluid discharged from one of the distribution ports and supplied into the other distribution port when the servovalve is in the neutral position.
- Assignee:
- Toyota Koki Kabushiki Kaisha, Kariya
- Patent Number(s):
- US 4799514
- OSTI ID:
- 6302185
- Resource Relation:
- Patent File Date: Filed date 25 Mar 1988
- Country of Publication:
- United States
- Language:
- English
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