| 摘要 |
<p>1. A rotary hydraulic distributor for a servo mechanism comprising an asymmetrical servo motor (162) in particular for a servo steering system in an automotive vehicle of the type comprising a pair of distributor elements provided with coaxial cylindrical portions, i.e. an external distributor element (111) mounted in a fixed casing (115) and an internal distributor element (113) mounted for rotation in an axial bore (114) of the external 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 a fluid circuit connectable between a fluid pressure source (160) and a fluid reservoir (161), said circuit comprising passages of variable cross section defined in the cylindrical contact surfaces of said distributor elements and comprised of longitudinal grooves (140, 140a) circumferentially spaced on the external surface of the internal distributor element (113) ; pairs of traverse orifices (144) and recesses (145) diametrically opposed in pairs, radially extending through the external distributor element (111) and positioned, in said neutral position, opposite ports (146) of the internal distributor element between adjacent edges of two associated grooves of the latter ; and of evacuation bores (147) communicating with means (124, 136, 130) for connection to the reservoir, formed radially in the internal distributor element and opening into said ports corresponding to said recesses (145), the distributor comprising in the casing (115) an orifice (129) for connection to the fluid pressure source (160) and two orifices (131, 132) for connection to two respective chambers (162a, 162b) of the servo motor (162), respectively in communication with annular spaces (133, 135) axially defined between the internal surface of the casing (115) and the external surface of the external distributor element (111), the orifice (129) for connection to the fluid pressure source (160) and the one (131) of the orifices for connection to the one (162a) of the chambers of the servo motor communicating with the same annular space (133), while the orifice (132) for connection to the other chamber (162b) of the servo motor communicates with another annular space (135) into which radial bores (149) open, which radial bores are formed in the external distributor element (111) opposite to one longitudinal groove (140a) of two of said internal distributor element (113).</p> |
