Directional control valve in a full hydraulic type steering control system
US5682744A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1996 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Jan 19, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86734
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A full hydraulic type steering control system is provided with a steering control valve for outputting a flow of a pressurized discharge fluid of a hydraulic pump in proportion to an amount of steering at a steering wheel, and a directional control valve for delivering the pressurized discharge fluid of the hydraulic pump into a steering control cylinder, with the output flow of pressurized fluid of the steering control valve being switched as a pilot fluid pressure. The directional control valve comprises a spool adapted to be slidably inserted in a spool bore of a valve body. The spool has a neutral position and is adapted to be displaceable from the neutral position towards a first position for delivering the pressurized discharge fluid of the hydraulic pump into a first fluid chamber of the steering control cylinder while permitting a pressurized fluid in a second fluid chamber thereof to flow out into a reservoir and towards a second position for delivering the pressurized discharge fluid of the hydraulic pump into the second fluid chamber of the steering control cylinder while permitting a pressurized fluid in the first fluid chamber thereof to flow out into the reservoir.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.