| 摘要 |
This distributor comprises an external element (3) mounted rotatably in a housing (1) and an internal element (10) mounted rotatably in the external element and capable of a limited rotation on either side of a neutral position. The external element (3) has inlet passage ports (17a), (17b) communicating with a fluid pressure source (5), at least one pair of distribution ports (19, 20) communicating selectively with one of the two opposite chambers of a drive means (8), and return recesses (18, 31) communicating permanently with the tank (15). The internal element (10) has longitudinal grooves (16) which, in the neutral symmetrical position, throttle the distribution ports in the same proportion and also ensure permanent communication between the inlet ports and some of the return recesses. In controlled return recesses (18), there is a movable throttling member (22, 23) which, under the effect of a control mechanism, is capable of varying the passage cross-section of the fluid return between some grooves (16) and controlled recesses (18). The invention is used for the assisted steering of motor vehicles.
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