| 摘要 |
In a valve assembly of a power steering device, the center line of a cylindrical bore of a valve sleeve intersects the center line of a radially extending pin hole in the valve sleeve and is displaced from the center line of the valve assembly toward the side of the sleeve opposite to the pin hole. The valve sleeve is thicker at its periphery adjacent to the pin hole, thereby increasing the engagement length of a drive pin with the pin hole. Consequently, the pressure-receiving area of the pin hole is increased, and the unit area engagement force of the valve sleeve is thus reduced. The bending moment on the drive pin is also reduced, which adds to the durability of the drive pin. Since a bearing stress is thus reduced, a driver never feels unexpected reaction, due to wear, applied to a steering wheel while the driver is manually turning the steering wheel.
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