| 摘要 |
PCT No. PCT/EP86/00577 Sec. 371 Date Jun. 16, 1987 Sec. 102(e) Date Jun. 16, 1987 PCT Filed Oct. 8, 1986 PCT Pub. No. WO87/02318 PCT Pub. Date Apr. 23, 1987.Rotary pressure control valves in booster steering systems are rotated by manual force at the steering wheel against a return force, usually a steel torque rod which is twisted by rotation of the steering wheel. Upon release of steering force, the untwisting of the rod causes reverse rotation toward neutral shut-off, i.e., centered position, so that coacting pressure channels of relatively rotated valve components are closed. Such reverse rotation is effected herein with the aid of a metal bellows which is compressed by cam operation during twisting of the torque rod. Upon untwisting, the bellows expands and acts through the cam to exert a reverse rotary force on the valve components to effect complete centering. Upon reaching centered valve position, the cam serves as a detent to hold the centered position of the valve components.
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