Abstract: A hydraulic motor comprises a fixed case, a reaction member secured to the case, a cylinder block mounted to rotate relative thereto about an axis of rotation, and an internal fluid distributor prevented from rotating about the axis relative to the case. The case has a “distribution cover” portion situated around the have respective first and second housings are formed to received a pin which prevents relative rotation while allowing the distribution cover in an axial direction, thereby preventing the distributor from separating from the cover while the motor is being assembled.

Abstract: Pressurized fluid motor comprising a casing, a cylinder block, a cam, an internal fluid distributor and a selector. The bore of the selector has four grooves. Two of them are communication grooves each connected to a main (feed or exhaust) power duct and to a connection duct, the connection ducts being themselves connected to different groups of distribution ducts. The other two grooves of the bore are branch grooves respectively connected to an additional (feed or exhaust) power duct and to a third connection duct. The slide of the selector comprises at least a first selection groove which is adapted to establish communication between the two branch grooves. By modifying only the shape of the slide, and possibly that of the bore of the additional duct, the selector can provide different functions.

Abstract: This invention relates to a hydraulic fluid circuit comprising a reversible hydraulic motor, a braking device, two principal conduits respectively connected to the two principal supply and exhaust ports of the motor, a principal selector adapted to occupy a position of rest and two active positions in order to select the circulation of the fluid between the principal ports of the motor and the principal conduits to which they are connected. The circuit also comprises an intermediate system of selection capable of occupying a first configuration in which the principal selector is maintained in its position of rest and a second configuration in which the principal selector is allowed to leave its position of rest. The control means of the intermediate system of selection are connected to the braking device so that this intermediate system can pass from its first to its second configuration only when the brake is de-activated.

Abstract: A drive mechanism (10, 110) for driving first and second displacement members (12, 14, 112, 114) disposed in tandem. The mechanism includes first and second driven sprockets (16, 18; 116, 118) for respective ones of the displacement members, a hydraulic motor (20; 120), and first and second driving sprockets (22, 24; 122, 124) disposed on the casing of the hydraulic motor so as to be rotated thereby. The mechanism also includes first and second chains (26, 28; 126, 128) disposed in a chain case (30; 130), each chain being engaged on a respective driven sprocket and on a respective driving sprocket. The hydraulic motor (20, 120) is a low-speed high-torque motor, having radial cylinders and a rotary casing. The motor is substantially contained in the chain case (30; 130).

Abstract: A braking device comprises first and second braking device respectively constrained to rotate with the brake case and with a brake shaft. The device comprises a braking piston, resilient device for displacing the piston axially towards a braking position, hydraulic device for displacing the piston axially in the opposite direction towards a brake-release position, and mechanical brake-release device for bringing the piston into its brake-release position and for holding it there. These mechanical brake-release device comprise at least two brake-release systems each comprising a bore having at least one substantially radial first segment, a screw displaceable in the bore, and displacement transfer device comprising at least one intermediate member suitable for transforming the radial displacement of the screw into axial displacement for pushing away the piston.

Abstract: A hydraulic motor comprising a casing, a reaction member, a cylinder block, an inner fluid distributor valve fast with the casing with respect to rotation about the axis of the motor and a driving shaft extending inside the casing coaxially to said axis. The motor is a low-speed, high-torque motor and comprises, disposed inside the casing, a coupling member fast in rotation with the cylinder block, a step-up gear, first and second mechanical engagement means for connecting the coupling member and the driving shaft and, respectively, the coupling member and the step-up gear, in rotation. The coupling member is mobile between a first and a second position in which the first and the second engagement means are selectively activated and de-activated. The motor comprises means for controlling the displacement of the coupling member between its positions. The driving shaft is capable of constituting a portion of the main shaft of the transmission of a vehicle.

Abstract: An auxiliary hydraulic motor comprises a fixed casing having a cam, a cylinder block, an internal fluid distributor, and a through shaft which extends inside the casing along the axis of rotation of the cylinder block. The through shaft is constituted by a length of a vehicle transmission shaft. The motor includes an axially moving coupling member suitable, in a first position, for being engaged with the cylinder block and the shaft via first and second mechanical engagement means, and in a second position, for being disengaged from the cylinder block and/or the shaft.

Abstract: A hydrostatic bridge including two hydraulic motors each having two distinct operating cylinder capacities, both motors sharing an overall casing. The bridge has four main ducts of a first type (feed or exhaust) and two main ducts of a second type (exhaust or feed). The overall casing has three upstream ducts respectively connected to the first and second main ducts of the first type themselves connected to distribution ducts of the first motor, to third and fourth main ducts of the first type, themselves connected to distribution ducts of the second motor, and to first and second main ducts of the second type, themselves connected to distribution ducts of both motors. The bridge includes an anti-spin device capable of selectively reducing the flow rate in the first upstream duct and in the second upstream duct for selectively correcting spin of the first and second motors.

Abstract: A pressurized fluid motor comprising a case, constituting its stator, and including connection ducts, a cylinder block rotatable about a first axis relative to a reaction member that is stationary relative to the case, and an internal fluid distributor that is likewise stationary relative to the case and that has distribution ducts. The case has a connection and fixing face that is plane and perpendicular to the first axis and into which the connection ducts open out. There exists a second axis perpendicular to and intersecting the first axis and lying in the plane of the face, relative to which the centers of the ends of the connection ducts are disposed in such a manner that the distance between each of them and said second axis lies in the range one-fourth to once the distance between said first axis and the point of the face that is furthest from said first axis, with the ends of the connection ducts all being situated on the same side of said second axis.

Abstract: The invention relates to a hydraulic mechanism comprising: a cam; a cylinder block; cylinders formed in the cylinder block; pistons slidably mounted in the cylinders; thrust rollers for the pistons acting on the cam and axially defined by two transverse faces; two wedging parts for each roller, each wedging part being disposed in a recess between the end face of the roller and the inside face of the cylinder, thereby holding the roller in position, one of the wedging parts extending to the bottom portion of the recess and including a groove parallel to the axis of the piston, and a projection that is fixed relative to the cylinder being received in the groove.

Abstract: The invention relates to a hydraulic motor having a plurality of cubic capacities, and provided with individual cubic-capacity selectors associated with at least some of its cylinders, each selector being provided with a control member. According to the invention, the control member coupled to each of said individual selectors can be activated only in that range of positions of the cylinder associated with said individual selector which corresponds to the axis of said cylinder being in alignment with the crest of one of the undulations, and to positions that are angularly adjacent to the position in which said alignment is obtained. An application of the invention is to making a motor that is mechanically strong.

Abstract: In a combination of two pressurized fluid motors fed in parallel by a common feed circuit, each of the pressurized fluid motors includes a casing and a cylinder block rotatable about an axis relative to a cam constrained to rotate with said casing and having a communication side perpendicular to the axis. An internal fluid distributor is constrained to rotate with the cam. It has a distribution side perpendicular to the axis and bears against the communication side. Distribution conduits open onto the distribution side and are formed in the internal fluid distributor of each motor. The casings of the two motors are constrained to rotate together.

Abstract: This invention relates to a drive unit comprising a frame; a rotating shaft, a first fluid motor presenting a cam fixed with respect to the frame; and a cylinder block fast with the shaft driven by the first motor at a first speed of rotation.According to the invention, the shaft presents a recess conveying a drilling fluid; the cylinder block of the first motor is coaxial to the axis of rotation; drive unit comprises a second motor coupled in rotation to the shaft and driving it at a second speed of rotation higher than the first speed of rotation; a first pinion gear is fast with and coaxial to the shaft; the second motor presents an output shaft fast with a second pinion gear meshing with the first pinion gear; and the first motor is of the type with "disengageable pistons".One application is the production of a high-performance drilling assembly.

Abstract: The invention concerns a dual-capacity hydraulic motor. In accordance with the invention, the capacity selector device comprises two valves each having a body with two grooves and a sliding slide valve with only one groove. One application is to the implementation of a low-cost, lightweight motor that is compact in the axial direction.

Abstract: This invention relates to an assembly of a hydraulic motor and of a brake which is coupled thereto, comprising in particular a brake shaft which traverses said motor and brake entirely. According to the invention, the brake shaft comprises an axial through recess allowing passage of a link, such as a movement transmission shaft. One application of the invention is the production of a reliable compactor.

Abstract: The assembly of a hydraulic motor and of a brake, comprising a frame; a cylinder-block mounted to rotate via a bearing and provided with a communication face; a fluid distributor valve provided with a distribution face in abutment against the communication face of the cylinder-block. A plurality of braking members are provided, some fast with the frame, the others fast with a brake shaft itself fast in rotation with the cylinder-block. An axial thrust braking member and a brake-release jack are coupled between the frame and the brake shaft. The brake shaft is fast in translation with the cylinder-block in the direction opposite that of the thrust force producing abutment of the distribution face against the communication face.

Abstract: The invention relates to a mechanism comprising: a cam; cylinders; pistons; two main enclosures containing feed fluid and exhaust fluid; a fluid distributor; and balancing enclosures communicating with distribution ducts included in the distributor. According to the invention, the distributor includes a face facing a reaction face secured to the cam or to the cylinder block, the balancing enclosures being constituted by chambers that open out into said end face and by a sealing device received inside the chamber and bearing against the reaction face. One application lies in providing a range of compact motors.

Abstract: The invention relates to a hydraulic circuit for supplying at least one motor incorporating "disengageable" pistons, comprising a fluid distributor valve obturating, in one of its positions, the supply and exhaust conduits of said motor.According to the invention, the fluid distributor valve comprises a shuttle valve presenting two inlet connections and one outlet connection, and, in said position, establishes communications of the supply conduit with one of the inlet connections, of the exhaust conduit with the other inlet connection, and of a conduit evacuating fluid towards a reservoir with said outlet connection of the shuttle valve.One application of the invention is the production of a vehicle translation circuit comprising a "disengageable" assistant motor.

Abstract: A mechanism casing for a hydraulic motor comprises a casing body having a face for application of a lid. The lid is applied tightly on the casing body face and fastened to the casing body by screws via screwheads thereof tightened against an outer face of the lid. The screws pass through the lid via screw passages with circumferential clearance between the screws and screw passages. An O-ring is interposed between the casing body and the lid. At least one of the screw passages are conduit screw passages which open out within a perimeter defined by the O-ring. The conduit screw passages open out into cavities formed in one of either the casing body or the lid, and through which cavities the conduit screw passages permanently communicate with the enclosure defined by the casing.

Abstract: The assembly of a fluid motor with two cubic capacities and of a brake which is coupled thereto, is disclosed. According to the invention, the large cubic capacity of the motor can be selected only when the brake is in its brake-release configuration. One application of the invention is the production of a "braked" motor provided with a relatively small, but operationally reliable brake.