Rotary valve for power steering

B - Operations – Transporting – 62 – D

Patent

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Details

B62D 5/083 (2006.01) B62D 6/02 (2006.01)

Patent

CA 2100668

A hydraulic power steering rotary valve of generally conventional construction characterised in that the on-centre characteristics of the valve are governed by an arrangement of rolling elements (22) and pairs of notched elements (10, 20) arranged to produce a detent action between the input shaft (1) and the sleeve or driven member (2), one notched element (2) of each pair being fixed to a carrier (11) which is connected to the sleeve or driven member (2) by securing means (13) that, during assembly, is free to move under the influence of springs (23) acting on the notched elements (20) and thereby take up a position such that after completion of assembly the notched elements (10, 20) and rolling elements (22) are precisely in the correct position to provide the required detent action.

La présente invention vise une vanne à opercule tournant pour servodirection hydraulique de construction traditionnelle se distinguant en ce que les caractéristiques de la vanne lorsqu'elle est en position médiane sont déterminées par un assemblage d'éléments à roulement (22) et des paires d'éléments à encoches (10, 20) disposés de manière à produire une détente entre l'arbre d'admission (1) et le manchon ou l'élément entraîné (2), un élément à encoche (2) de chaque paire étant fixé à un composant porteur (11) lui-même relié au manchon ou à l'élément entraîné (2) par des dispositifs de fixation (13) qui, durant l'assemblage, peuvent se déplacer sous l'action de ressorts (23) appuyant sur les éléments à encoches (20) et de ce fait prendre une position assurant que, une fois l'assemblage terminé, les éléments à encoches (10, 20) et les éléments à roulement (22) occupent précisément la position permettant d'engendrer le mouvement de détente requis.

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