| 摘要 |
An electro-hydraulic power steering system for motor vehicles using closed center valving. Utilizing closed center valving (40) in association with the steering gear (50) allows the pump (12) to build hydraulic pressure in the accumulator (20) against the closed center valve area (47) in the valving for the steering gear, thus always maintaining a relatively high pressure, regardless of the position of the steering wheel shaft 3 and the input shaft (43). The input shaft was modified from that of the prior art, particularly with respect to the size and relative positioning of the exterior grooves (140) for the return ports (46), which exterior grooves selectively mate with like, longitudinally extended grooves (144) in the conventional control sleeve (42).
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