| 摘要 |
<p>1. A rotary hydraulic distributor for a servo mechanism, in particular for a servo steering system in an automotive vehicle, comprising two distributor elements having coaxial cylindrical portions, i. e. an external distributor element (11) and an internal distributor element (13) rotatably mounted in an axial bore (14) of the external distributor element and adapted to perform a limited relative rotation with respect to the latter in opposite directions from a relative neutral position, the distributor elements comprising openings and cavities defining at least one fluid circuit connectable between a fluid pressure source and a fluid reservoir, the circuit comprising passages of variable section defined in the cylindrical contacting surfaces of said distributor elements and comprised of longitudinal grooves (40a, 40b) circumferentially spaced around the external surface of the internal distributor element (13), pairs of first (44) and second (45) recesses opposed two-by-two and formed in the external distributor element (11) to register in said neutral position with lands (46) of the internal distributor element between the adjacent edges of two adjacent grooves of the latter, the first recesses (44) communicating with a fluid feeding circuit communicating with the fluid source, and discharging bores (47) communicating with an internal channel (24) for connection to the reservoir, formed in the internal distributor element and opening on the lands corresponding to the second recesses (45), characterized in that the first (44) and second (45) recesses are radially bored into the external distributor element (11) in order to provide there opposite pairs of traversing orifices (44) and cavities (45) opening into said axial bore (14).</p> |
