| 摘要 |
A steering system for a vehicle includes a hydraulic control valve with first and second coaxial valve members rotatable relative to each other to selectively port pressurized fluid to a vehicle power steering motor. The first valve member is connected to and rotatable with an input shaft. The second valve member is connected to and rotatable with an output member. The second valve member is axially movable relative to the first valve member between first and second positions. The input shaft and the output member are directly interconnected by the second valve member and rotatable together to effect manual steering of the vehicle when the second valve member is in its first axial position. The input shaft is rotatable relative to the output member to effect power assisted steering of the vehicle when the second valve member is in its second axial position. The second valve member is moved from its first position to its second position when the velocity of the vehicle is below a predetermined value.
|
