초록 ▼

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

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.

대표청구항 ▼

A mechanism particularly for booster steering rotary valves for return of relatively rotatable valve components to an initial position wherein a torque rod (2) has ends (3, 4) fixedly connected to respective relatively rotatable components (5, 6) to be torsionally stressed by rotation of one of said

A mechanism particularly for booster steering rotary valves for return of relatively rotatable valve components to an initial position wherein a torque rod (2) has ends (3, 4) fixedly connected to respective relatively rotatable components (5, 6) to be torsionally stressed by rotation of one of said rotatable components (5) for effecting return toward said initial position of said valve components when said torsional stress is released; the improvement wherein a compressible, spring-like, torsionally stiff bellows (11) is secured to one said rotatable component (5) and encompasses said torque rod; a cam means (13) between said relatively rotatable components (5, 6) operative to compress said bellows when said one component (5) is rotated in torsionally stressing said torque rod; whereby upon permitting said torque rod to untwist for restoring said valve components toward initial position said cam means permits the expansion of said bellows to aid in restoring said valve components through said cam means to a fully centered position.