Abstract: The invention relates to a pressure fluid mechanism comprising: a reaction cam; a cylinder block mounted to rotate relative to the cam and including a central void and an axial extension enabling it to be fixed to a support; and an internal fluid distributor valve constrained to rotate with the cam by a link mechanism which extends inside the central void, the cylinder block and its extension constituting an assembly which is interposed between the cam and the internal fluid distributor valve. According to the invention: a) a braking device is disposed at the end of the mechanism towards which the link device extends, the braking device being disposed between the cylinder block and the cam and including a chamber containing brake disks, which chamber is delimited by a cover; b) the link mechanism is constrained to rotate together with the cover of the chamber containing the disks; and c) the cover of the chamber is constrained to rotate with the cam.

Abstract: This invention relates to a hydraulic mechanism comprising a cam; a cylinder-block mounted to rotate with respect to the cam; a plurality of cylinders arranged in this cylinder-block; a plurality of pistons mounted to slide inside a cylinder; a plurality of rollers for abutment of the pistons on the cam, each roller being mounted on a piston, rotating by means of a bearing for rotation, being axially defined by two transverse faces, and being capable of penetrating, at least partially, inside the cylinder in which this piston slides, the end of the piston comprising two recesses corresponding at least to the intersection of the cylindrical surfaces of the roller and of the piston, being open in the upper part of the piston; and two wedging pieces which are each disposed in a recess between the roller and the cylinder, in order to ensure axial wedging of the roller parallel to its axis of rotation.

Abstract: This invention relates to a mechanism employing fluid under pressure, comprising: a stator; a rotor; a device for assembling the rotor with respect to the stator, effecting relative rotational assembly of these two elements about a geometrical axis, and ensuring axial holding of said two elements in position, in the two opposite directions, parallel to said geometrical axis; a reaction cam fast with a first of said elements; cylinders made in the second element and disposed radially with respect to said geometrical axis; and pistons mounted in said cylinders and abutting on said cam. According to the invention, the assembly device is constituted by a single bearing which comprises: two rolling tracks made directly on an extension of the reaction cam itself, and on an extension of the element itself in which the cylinders are made, respectively; rolling members disposed between the tracks, capable of abutting on these two tracks so as to ensure axial holding of the rotor with respect to the stator.

Abstract: The present invention relates to a hydraulic motor capable of presenting two active cubic capacities of different values, as described in FR-A-2 481 755, and comprising in particular a shuttle valve presenting an inner conduit, wherein a bleeding conduit is arranged in the member for selecting the cubic capacity and communicates with the inner conduit of the shuttle valve, which it connects to an evacuation, while a calibrated restriction is disposed in the bleeding conduit. One application is the production of refrigeration of the hydaulic fluid for supplying this mechanism in closed circuit.

Abstract: The invention relates to a pressurized fluid mechanism comprising a plurality of pistons (14) and a plurality of different cylinder capacities. A particular cylinder capacity is selected by means of two identical slide valves (17, 18) which serve selectively to neutralize either a first overall cylinder capacity (45a) or a second overall cylinder capacity (45c), or both or neither of said first and second cylinder capacities. One application of the invention is to providing an efficient and compact motor which is cheap to produce.

Abstract: A rotary mounting for mounting a gear wheel relative to a frame, the gear wheel being constrained to rotate with a shaft such as a drive shaft, the mounting being constituted by: the gear wheel being mounted at one end of the shaft around the outer periphery thereof; an axial hollow in the end of the shaft opening out into the end transverse face of the shaft; a protuberance fixed to the frame and coaxial with the hollow, the protuberance being contained inside said hollow; and a single rotary bearing disposed between the protuberance and the hollow at the end of the shaft.

Abstract: The invention relates to a hydraulic motor having an undulating cam and at least one large and one small selectable operating cylinder capacity. In the motor, cylinder feed orifices (41a, 42a) are distributed around the circumference of a circle about the axis of rotation (5), and the small cylinder capacity corresponds to an irregular angular distribution of active cylinder orifices (41a) which continue to be fed. This configuration makes it possible to provide a constant velocity motor with at least two different cylinder capacities and which is mechanically long-lasting.

Abstract: The invention relates to a braking device, constituted by a housing in which is housed a brake disc fixed in rotation with respect to the housing, a shaft mounted to rotate, a rotary brake disc, fast with the shaft, a first jack, constituting a pressurized fluid braking control member, and a second jack distinct and independent of the first jack, which defines, inside the housing, a brake-release chamber, to which is coupled an elastic safety braking member, the mobile element of the first jack and the piston of the second jack being stacked axially in that order from only one of the two ends of the alternate stack of the fixed and rotary brake discs. The mobile elements of the two jacks are each at least partly contained in the brake-release chamber which, furthermore, contains each fixed brake disc and 1 or each rotary brake disc. One application of the present invention is a multiple-effect brake of satisfactory compactness.

Abstract: This invention relates to a hydraulic mechanism having a cylinder block comprising cylinders, pistons mounted in these cylinders, and supporting rollers for abutment on a cam with respect to which the cylinder block is mounted to rotate. The mechanism for holding each roller in position with respect to a corresponding piston comprises two distinct supports which each abut on the inner surface of the cylinder, are maintained in position along the axis of the piston, have their angular orientation with respect to this axis constant and possess a face for abutment against an end face of the roller. One application of the invention is the manufacture of a compact engine.

Abstract: The invention relates to a pressurized fluid mechanism comprising a cam, a cylinder-block mounted for rotation with respect to the cam, cylinders disposed radially in said cylinder-block, pistons sliding in said cylinders, supporting rollers supporting the pistons on said cam, each roller being placed inside a transverse bore provided in each piston and a device with abutments to hold each roller in axial position in its bore.Each roller being able to comprise two projecting members on each side, the abutments present interruptions in axial directions which coincide with the radial planes containing said projecting members.The invention finds an application in the production of compact engines with "releasable" pistons.

Abstract: The present invention relates to a double-acting hydraulic pump comprising a piston moving with a reciprocal rectilinear movement inside a cylinder of which each chamber is provided with a suction valve and a delivery valve, the rod of said piston being adapted to be driven by a variable-displacement driving member. The said piston rod extends beyond the piston and moves, outside the cylinder within a space of variable volume, provided in the body of the pump, which communicates, with a member controlling the by-pass device through which the two chambers of the cylinder communicate.

Abstract: The present invention relates to an assembly, for use in a pressurized fluid mechanism equipped with pistons bearing against a reaction plate by way of slipper blocks, which assembly consists in such a piston and the associated slipper block coupled to one end of said piston by means of a "ball and socket" type assembly, the male element of the assembly being constituted by that part of the slipper block facing the face supporting the said slipper block on the reaction plate. A bolt comprising a screw and nut, joins the slipper block to the piston, the supporting surfaces of the nut and of the screw head on the corresponding parts of the slipper head and of the piston being of the "ball and socket" type.The invention finds an application in the production of high power hydraulic motors.

Abstract: The invention relates to a fluid engine constituted by cylinders divided into two groups, by a valve bank which comprises two enclosures connected selectively to a source of fluid and to a reservoir, and connecting each cylinder of a first group, with the said enclosures, successively, and by means for selecting the speed of the engine, which means comprise a movable member adapted to occupy two positions which, in a first position, creates a communication between the cylinder of the second group and the enclosures, successively, and in a second position, isolate said cylinders from one of the enclosures.Said engine comprises a shuttle valve which, when the movable member is in its second position, connects the cylinders of the second group to that of the two enclosures which contains the fluid under the lowest pressure.The invention finds an application in the production of a mechanically reliable reversible engine.

Abstract: The invention relates to a hydraulic engine with radial pistons, comprising girders which transmit the thrusts of the pistons and rest against strips secured to the cylinder block.The surface of the cylinder block has a degree of roughness at least equal to the following values given in reference to the currently applied norms 0.25 .mu.RA; 15 .mu.Rt; and 8 .mu.Rp.The invention finds its application in the production of a reliable engine.

Abstract: The invention relates to a fluid mechanism supplied with pressurized fluid by means of a "dis-engageable" valve-seat. Such mechanism further comprises a controlled and independent device for re-engaging the said valve-seat. The invention finds an application in the production of a hydraulic relief engine for use on a trailer pulled by a tractor.

Abstract: The invention relates to a drive-assisting device comprising at least a fluid relief engine, a source of pressurized fluid, an engine supply pipe connecting the delivery connector of the fluid source to the inlet connector of the engine, and a calibrated discharge valve, shunt-connected to the supply pipe and provided with means for adjusting its calibration, the control of which is deliberate.

Abstract: The invention relates to an engine with radial pistons 9, which are coupled to elastic return means 25 for free-wheeling operation.Said elastic means are constituted by springs 25 whose number is equal to that of the pistons and by levers 21 mounted to pivot, each with respect to a piston 9, about an axis parallel to the axis of rotation 6 of the cylinder block 7, and equal in number to the springs, whereas each spring 25 is coupled to two levers 21, each lever constituting the bond for two springs 25.An application is the production of a hydraulic engine which is reliable and of simple design.

Abstract: Apparatus for fixing and driving a displacement member (such as a wheel) of a vehicle is disclosed. In particular, an axle journal is coupled to the vehicle chassis. At least one rotating bearing surface is disposed between the displacement member and the axle journal for the rotatable assembly of the displacement member. A drive motor is provided having a stator which is removably attached to the axle journal and a rotor which is removably mounted to rotate with respect to the stator by means of rotating bearings in contact with the bearing surface. Since the rotating bearings of the motor only contact the removable bearing surface, the motor can be dismantled while maintaining the displacement member in place on the axle journal.

Abstract: A hydraulic mechanism, e.g. a pump or motor, comprises a plurality of cylinders and pistons and a piston-displacement selector which is provided with blind helical grooves for controlling connection of the cylinders to the main fluid supply.

Abstract: The invention relates to a fluid engine constituted by cylinders divided into two groups, by a valve bank which comprises two enclosures connected selectively to a source of fluid and to a reservoir, and connecting each cylinder of a first group, with the said enclosures, successively, and by means for selecting the speed of the engine, which means comprise a movable member adapted to occupy two positions which, in a first position, creates a communication between the cylinder of the second group and the enclosures, successively, and in a second position, isolate said cylinders from one of the enclosures.Said engine comprises a shuttle valve which, when the movable member is in its second position, connects the cylinders of the second group to that of the two enclosures which contains the fluid under the lowest pressure.The invention finds an application in the production of a mechanically reliable reversible engine.