Abstract: The device comprises an internal distributor to be disposed in a casing portion (10A), and comprising a body (15) that has an outside axial face (15B) provided with two grooves (17, 19) respectively for feed and for discharge. The distributor has distribution ducts (23A, 23B, 23C) that open out in a distribution radial face and a cylinder capacity selector that comprises a slide (50) suitable for being moved in an axial bore (53) for connecting the distribution ducts to one or the other of the grooves. The device further comprises a control chamber (52) provided between a first end wall (15?) of the bore and the first end (50A) of the slide, and an opposing spring (55) disposed in a return chamber (52?) situated at the second end (53?) of the bore and closed, at the end closer to the distribution face (15A), by a second end wall (55?) of the distributor.

Abstract: The invention relates to a braking system (1) including: a dynamic brake (10), including a hydraulic ram (11), including a cylinder (12), a piston (13) movable in the cylinder (12), and a chamber (14) capable of being filled to displace the piston within the cylinder and actuate the brake, a circuit (20) for feeding the brake, including a reservoir (21) a pump (22) and a brake feed line (26), a brake control device (30), including a fluid pressure regulating valve (32) in the brake chamber, and progressive control (31), the valve including a path connected to the feed line, a path connected to the reservoir, and a path connected to the brake chamber, and being designed to selectively connect the path connected to the chamber to one or the other of the other paths, to deliver a predetermined pressure into the chamber according to a degree of actuation of the control, the braking system being characterized in that it further includes a chamber cooling line (40), designed to renew the fluid contained in the

Abstract: A hydraulic transmission circuit is provided having at least two elementary hydraulic motors, each having a secondary enclosure and a main duct for fluid feed and a secondary enclosure and a main duct for fluid discharge. A fluid distributor distributes fluid from the main ducts to the elementary motors via the secondary enclosures. A control system controls the elementary motors. Valves connecting the fluid distributor to the secondary enclosures of the first motor put a secondary enclosure into communication with a main duct independent of an operating mode of any other elementary motor.

Abstract: The devices comprises a distributor (16) that presents distribution ducts opening out into a radial distribution face (16A), and a distributor-counterpart engaged in each other in such a manner that two main enclosures (18, 20) are provided between their opposite axially-extending faces. The device comprises a cylinder-capacity selector comprising two slides (24, 26) arranged after the other in a bore (22) of the element engaged in the other, to which are connected the main enclosures (18, 20) and at least some of the distribution ducts (30, 31). The slides are able to adopt at least three distinct configurations establishing different connections between the main ducts (18, 20) and the distribution ducts via the main enclosures, in order to be able to obtain at least three distinct operating cylinder capacities.

Abstract: The machine comprises distribution ducts connected to respective ones of first, second, and third enclosures (40, 42, 44), and a cylinder-capacity selector (21) suitable for being caused to take up a large cylinder capacity configuration in which the second enclosure (42) is connected to one of the main ducts (2), while the first and third enclosures (40, 44) are connected to the other main duct (1), and a small cylinder capacity configuration in which the second and third enclosures (42, 44) are connected to said one of the main ducts (2), while the first enclosure is connected to the other main duct (1). The machine further comprises a safety valve (150) having at least a first port (56) connected to said one of the main ducts (2), and a second port (58) connected to the third enclosure (44).

Abstract: The invention concerns a suspension element for self-propelled machine comprising: a suspension fork (100) secured to the chassis of the machine and comprising two parallel arms (120, 130), a motor (400), secured to two sleeves (200, 300) each comprising at least one bearing (210A, 210B, 310A, 310B) adapted to slide in translation on the arms (120, 130), the suspension element being characterized in that the two sleeves (10) (200, 300) are separate parts, the motor (400) comprising a casing (410) adapted to form a supporting frame allowing the ensured rigid connection between the two sleeves (200, 300) and for this purpose comprising connecting means designed to ensure the connection between the supporting frame of the motor and each of the two sleeves over a center distance range of the sleeves while withstanding the forces applied by the chassis on the casing.

Abstract: A vehicle including a driving axle (10), a driven axle (20), a hydraulic pump (14) and a hydraulic motor (24) providing hydraulic assistance for driving the driven axle (20) by lapping off torque applied to the driving axle (10). The driving axle (10) comprising includes a differential (11) thus defining two output half axles on which wheels are mounted. Rotation of the box allows the output half axles to be rotationally driven at distinct speeds. The hydraulic pump (14) includes a rotor and a stator, the stator being mounted fixed with respect to the chassis and the rotor being connected to and rotating as one with the differential box (11). The hydraulic pumps (14) are rotationally driven at a speed equal to the average speed of the two half axles associated with the differential (11) on which the pump is mounted.

Abstract: A hydraulic actuation unit for controlling the starting and stopping of hydraulic motors includes a first main circuit and a second main circuit, a first recirculation circuit and a second recirculation circuit, a counterbalancing valve, which includes a shuttle, and a first discharge channel and a second discharge channel. The shuttle includes a first check valve and a second check valve. The first check valve includes at least one first flow control element that can move from an open position to a closure position. The second check valve includes at least one second flow control element that can move from an open position to a closure position. The first and second check valves respectively are provided with first damping means and second damping means in order to slow down the passage movement respectively of the first flow control element and of the second flow control element.

Abstract: The invention relates to a hydraulic apparatus (1) including: a casing (6) defining a first assembly; a shaft (2) defining a second assembly; said first and second assemblies being freely rotatable relative to one another; a multi-lobe cam (3) rotatably connected to one of said first or second assembly; a dispenser (51) and a dispenser cover (52); a cylinder block (4) mounted such as to be freely rotatable relative to said first and second assemblies and including a means for rotatably engaging relative to the other of said assemblies, characterized in that the hydraulic apparatus (1) includes a return means for moving the cylinder block (4) in order to rotatably disengage same from said first or second assembly, and in that the dispenser (5) is configured, when applying pressure, to rotatably engage the cylinder block (4) relative to the other of said first or second assembly.

Abstract: A hydraulic transmission circuit comprising three or four coupled hydraulic elementary motors, each elementary motor having a first and a second secondary enclosure. The circuit includes four distribution valves for which the respective outlet channels may be selectively connected to two main conduits for supplying fluid to and discharging fluid from the circuit. The outlet channels of the first and second valves are connected to at least one of the first secondary enclosures; those of the third and fourth valves are connected to at least one of the second secondary enclosures. Each of the elementary motors has a first secondary enclosure connected to a single valve from among the first or second valve and a second secondary enclosure connected to a single valve from among the third or fourth valve. The valve pairs thereby connected to said elementary motors respectively, are all distinct, two by two.

Abstract: The hydraulic system comprises a casing (10) in which there are disposed hydraulic apparatus (12), a shaft (14) engaged in the casing, and a sealing device (16) between the shaft and the casing. The sealing device comprises first and second sealing elements (20, 22) disposed in succession on the shaft while forming between them a discharge chamber (24) connected to a drain (26), the first sealing element being situated between the discharge chamber and the internal space (11) of the casing. Between the discharge chamber (24) and the internal space (11) of the casing, the hydraulic system has a communication duct (28) in which a calibrated jet nozzle (30) is disposed.

Abstract: A hydraulic apparatus including a machine shaft having a proximal end and a distal end, adapted to drive a cylinder block. A clutch having a clutch shaft having a proximal end and a distal end, and a plurality of friction discs linked to the distal end of the clutch shaft and a plurality of friction discs linked to the proximal end of the machine shaft for selectively engaging the clutch shaft with the machine shaft. The friction discs are disposed radially around the machine shaft. The distal end of the clutch shaft is bell-shaped so as to surround the proximal end of the machine shaft. The bell shape defines an inner space where the proximal end of the machine shaft and the friction discs linked to the clutch shaft are located.

Abstract: An hydraulic transmission device (10,110) comprising an hydraulic motor (16, 18), an hydraulic pump (20), a fluid accumulator (22). The device has an accumulator-driven mode, an energy-recovery mode, a pump-driven mode. In the pump-driven mode, the pump supplies the motor with fluid drawn from an unpressurized reservoir; and in the energy-recovery mode, the motor is supplied by the pump drawing fluid from said reservoir. An assembly (1) comprising a device (10,110) as defined above, a shaft (11, 13), and a mass (12, 14) mounted eccentrically on the shaft.

Abstract: Hydraulic apparatus for recovering energy, said apparatus comprising a hydraulic motor, and a high-pressure fluid source and a low-pressure fluid source. The apparatus has: an energy consumption mode, in which the fluid is transferred from the high-pressure fluid source to the low-pressure fluid source while driving the motor in rotation; and an energy accumulation mode, in which, by the action of the motor operating as a pump, the fluid is transferred from the low-pressure source to the high-pressure fluid source. The apparatus further comprises a pressure reducer disposed on a duct interconnecting the two fluid sources. In energy accumulation mode, if the level of the low-pressure source is tending to become excessively low, the reducer opens, enabling fluid to reach the low-pressure fluid source via the first duct.

Abstract: The invention relates to a flow control valve adapted for use as a flow-dividing and flow-combining valve in hydraulic devices, comprising: a valve body having a first longitudinally extending bore, an outer spool slidably positioned within the bore, the outer spool having an axially extending passageway, a pair of axially extending inner spools slidably positioned within the passageway, the valve body having a first port and a pair of second ports, the outer spool having at least a first opening communicating with the first port and with the passageway, and at least two pairs of second openings therethrough. At least one second opening of each pair is of non-constant longitudinal section narrowing from the outer face of the outer spool on at least a part of the thickness of the second opening, so that a lateral side of the second opening offers an obstacle where a part of the fluid flow entering the second opening crashes before entering the inner spool.

Abstract: The present invention relates to a double hydraulic machine (100) comprising two elementary machines (M1, M2) each having two orifices, the double hydraulic machine (100) comprising a distribution valve (7) suitable for, in a first configuration (C1), feeding both elementary machines (M1, M2) in parallel, and in a second configuration (C2), producing a short circuit of one of the elementary machines (M2). The invention also relates to a system for driving a vehicle comprising such a hydraulic machine (100) for driving the vehicle into motion.

Abstract: The present invention relates to an assembly comprising —an axle (1), —a steering pivot (2) mounted on the axle (1), —a wheel spindle (3) mounted on the pivot (2), —a hydraulic motor and a wheel mounted on said spindle (3), such that the spindle (3) is pivotally mounted relative to the axle (1), the axle (1), the spindle (3) and the pivot (2) being provided with communicating hydraulic pipes to supply the hydraulic motor with fluid, the hydraulic pipes being arranged in the axle (1), the pivot (2) and the spindle, the pivot (2) comprising a shaft member fitted in the axle (1) about which the spindle (3) is fitted, the axle (1) and the spindle (3) each comprising grooves connected respectively to the hydraulic pipes of the axle (1) and the spindle (3) in such a way as to form the rotating joint with the hydraulic pipes of the pivot (2).

Abstract: The present invention relates to a hydraulic circuit comprising: an accumulator (11) a hydraulic device (1) a primary line (12) and a secondary line (13) connecting each said accumulator (11) to the hydraulic device (1), the primary line (12) comprising a restriction (14) and a primary distributor (15) adapted to selectively connect the hydraulic device (1) to the accumulator (11) or to a tank (R), the secondary line (13) comprising a secondary distributor (16) alternating between a first configuration in which it blocks the secondary line (13), and a second configuration in which it is passing, said secondary distributor (16) being controlled via the pressure within the primary line (12) downstream of the primary distributor (15) relative to the hydraulic accumulator (11), such that switching from the first to the second configuration of the secondary distributor (16) takes place only when the pressure in the primary line (12) reaches a threshold value.

Abstract: The present invention relates to a subassembly for forming a hydraulic motor after assembly onto an assembly including a shaft, said subassembly including a cover forming a housing element, a multilobe cam, a cylinder block opposite the cam, pistons guided so as to slide radially within the respective cylinders of the cylinder block and bearing on the lobes of the cam, and a valve intended to apply pressurized fluid to said pistons in series, wherein said subassembly includes means for temporarily attaching the cylinder block to the cover and means for accessing an element of the valve through the cover in order to enable, during installation, the angular positioning of said element with respect to the shaft, followed by the attachment thereof to the shaft. The present invention also relates to a method for assembling such a hydrobase.

Abstract: Hydraulic transmission apparatus (20) including a pump (24) having a variable cylinder capacity and feeding one or more hydraulic motors (26A, 26B), and a control unit (50). In the apparatus, the feed and discharge orifices of the motors are arranged in such a manner that, when the pressures at said orifices are equal, the outlet torque from the motors is zero. To make the apparatus inactive, without physically bypassing the motors, the control unit is suitable for operating the apparatus in a “torque-free” mode by regulating the cylinder capacity of the pump in such a manner that the pressures at said feed and discharge orifices remain substantially equal.