Hydraulic motor

A hydraulic motor of the type comprising a casing through which passes a rotating shaft coupled by a movement conversion means to an alternating rectilinear displacement piston, capable of movement inside the casing and mounted so as to slide along the length of the shaft, the piston defining in the casing first and second chambers alternately fed with fluid under pressure, an inverter installed in the interior of the casing and comprising three coaxial elements with axes parallel to that of the rotating shaft and mounted so as to slide and/or turn in a manner such as to be sealed in relation to one another;

• a first sleeve formed as one piece with the piston and extending into the first chamber;
• a second sleeve, fixed in position, formed as one piece with a wall at an end of the casing and extending across the second chamber and the first sleeve, up to the first chamber;
• and
• a distributor extending between the two chambers and mounted such as to rotate in the interior of the second sleeve;
• wherein the inverter further comprises conduit and hole elements suitable for controlling and switching the circulation of the actuating fluid, arranged between the second sleeve and the distributor, in order to control alternately and sequentially the filling of one chamber and the emptying of the other, depending on whether the distributor occupies such or such a predetermined position among several defined by the interaction of the coaxial elements, and
• control means for controlling the rotation of the distributor as a function of the displacement of the sleeve locked with the piston.