Abstract: The hydraulic machine includes a cam and a cylinder block with pistons co-operating with cam lobes, each of which has two ramps extending between top and bottom dead center arcs. The cylinders are connected in alternation to a feed and to a discharge, in sequences separated by switchover stages including an isolation stage during which they are isolated relative to the feed and discharge main ducts. The angular position of the start or of the end of at least one first isolation stage relative to the corresponding dead center arc is different from the angular position of the start or of the end of at least one second isolation stage relative to its corresponding dead center arc, both of these dead center arcs being top dead center arcs or both of them being bottom dead center arcs.

Abstract: The invention relates to a self-maintenance system (1) for a vehicle hydraulic assistance device (2), the said device (2) comprising a hydraulic machine (21, 23), the said hydraulic machine (21, 23) being configured to be brought into operation, or deactivated, alternately, the bringing-into-operation and the deactivation being afforded by movement of bringing-into-operation moving parts (211, 231), and the engagement and disengagement of the assistance being operable on command, the system (1) comprising a control module (11) configured to command the bringing into operation of the hydraulic machine (21, 23) for a predetermined length of time and then command deactivation of the hydraulic machine (21, 23) so as to flush all or part of the hydraulic machine (21, 23), the said commands being independent of a command to engage and disengage the assistance.

Abstract: The invention relates to a pressure-limiting device designed to be installed in a system comprising a first line (11) and a second line (12) that can comprise pressurised oil, as well as comprising a discharge and/or booster line (10). The limiting device is characterised in that it comprises means (131, 132, 133, 134) forming two valves, each associated with one of the two lines and adapted to open in the event of an overpressure above a pre-determined threshold on the associated line, so as to discharge the corresponding overpressure towards the discharge and/or booster line, said two valves comprising a common support stem (126) that operates in traction under the action of at least one spring defining a pressure corresponding to the pre-determined threshold. The invention also relates to a hydraulic assist system and to a vehicle comprising such a device.

Abstract: The invention relates to a pressure-limiting device designed to be installed in a system comprising a first line (11) and a second line (12) that can comprise pressurised oil, as well as comprising a discharge and/or booster line (10). The device also comprises a pressure selector (130, 150) in the form of a cage defining two seats (132, 134) and two pressure relief valves (160, 180). The limiting device is characterised in that it further comprises at least one means (170, 172; 190, 192) for regulating a pressure relief valve, disposed on the outside of an axial end of the pressure selector (150), in the form of a cage that allows the loading of the associated pressure relief valve to be regulated.

Abstract: The invention relates to a device comprising a first hydraulic apparatus (M1) and a second hydraulic apparatus (M2), the two motors (M1, M2) being connected by a first line (11) and a second line (12) enabling the admission or discharge of the oil in said motors (M1, M2), a booster pump (30), arranged between a tank and a booster line, the booster line communicating with at least one of said lines (11, 12), characterized in that the pump (30) is configured to be able to suck oil into the booster line in order to allow the decompression of said first and second lines (11, 12). The invention also relates to a method for evacuating a device of the type described above, in which the booster pump (30) is activated in suction mode in the booster line to enable the disengagement of the machines (M1, M2).

Abstract: The invention relates to a pressure-limiting device designed to be installed in a system comprising a first line (11) and a second line (12) that can comprise pressurised oil, as well as comprising a discharge and/or booster line (10). The limiting device is characterised in that it comprises means (131, 132, 133, 134) forming two valves, each associated with one of the two lines and adapted to open in the event of an overpressure above a pre-determined threshold on the associated line, so as to discharge the corresponding overpressure towards the discharge and/or booster line, said two valves comprising a common support stem (126) that operates in traction under the action of at least one spring defining a pressure corresponding to the pre-determined threshold. The invention also relates to a hydraulic assist system and to a vehicle comprising such a device.

Abstract: The invention relates to a distributor device and pressure limiter suitable for being installed in a system comprising a first supply line (11) and a second supply line (12) able to contain pressurised oil, and comprising an evacuation and/or booster line (10), characterised in that the device comprises means forming a pressure selector (72) suitable for connecting the lower-pressure supply line to the evacuation and/or booster line and means (71) forming two valves respectively associated with one of the two supply lines (11, 12) and suitable for opening in the event of an overpressure greater than a predetermined threshold on the associated supply line in order to discharge the corresponding overpressure to the evacuation and/or booster line (10) or to the other supply line, the two relief valves comprising a common plug (162) which engages with a single seat (155).

Abstract: The invention relates to a pressure-limiting device designed to be installed in a system comprising a first line (11) and a second line (12) that can comprise pressurised oil, as well as comprising a discharge and/or booster line (10). The device also comprises a pressure selector (130, 150) in the form of a cage defining two seats (132, 134) and two pressure relief valves (160, 180). The limiting device is characterised in that it further comprises at least one means (170, 172; 190, 192) for regulating a pressure relief valve, disposed on the outside of an axial end of the pressure selector (150), in the form of a cage that allows the loading of the associated pressure relief valve to be regulated.

Abstract: The hydraulic machine includes a cam and a cylinder block with pistons co-operating with cam lobes, each of which has two ramps extending between top and bottom dead center arcs. The cylinders are connected in alternation to a feed and to a discharge, in sequences separated by switchover stages including an isolation stage during which they are isolated relative to the feed and discharge main ducts. The angular position of the start or of the end of at least one first isolation stage relative to the corresponding dead center arc is different from the angular position of the start or of the end of at least one second isolation stage relative to its corresponding dead center arc, both of these dead center arcs being top dead center arcs or both of them being bottom dead center arcs.

Abstract: A hydraulic machine comprising a drum (12) rotated by an input shaft, comprising cylinders (14) distributed around the shaft, each receiving a piston that slides on the basis of the rotation of the shaft, each cylinder opening at an opening (30) on a transverse face of the drum bearing on a plate having inlet and outlet manifolds, the openings (30) comprising, relative to the cylinders (14) of same, angular offsets comprised within a total offset range, characterized in that the offsets of the openings (30) are disposed at one end or the other of this offset range.

Abstract: The invention relates to a device comprising a first hydraulic apparatus (M1) and a second hydraulic apparatus (M2), the two motors (M1, M2) being connected by a first line (11) and a second line (12) enabling the admission or discharge of the oil in said motors (M1, M2), a booster pump (30), arranged between a tank and a booster line, the booster line communicating with at least one of said lines (11, 12), characterised in that the pump (30) is configured to be able to suck oil into the booster line in order to allow the decompression of said first and second lines (11, 12). The invention also relates to a method for evacuating a device of the type described above, in which the booster pump (30) is activated in suction mode in the booster line to enable the disengagement of the machines (M1, M2).

Abstract: A hydraulic machine comprising a drum (12) rotated by an input shaft, comprising cylinders (14) distributed around the shaft, each receiving a piston that slides on the basis of the rotation of the shaft, each cylinder opening at an opening (30) on a transverse face of the drum bearing on a plate having inlet and outlet manifolds, the openings (30) comprising, relative to the cylinders (14) of same, angular offsets comprised within a total offset range, characterised in that the offsets of the openings (30) are disposed at one end or the other of this offset range.

Abstract: A rear hitch assembly (10) for an agricultural tractor is provided. The assembly comprises a drawbar carrier element (20) mounted to the underside of a chassis (13) by a first connection which permits fore and aft movement of the carrier element relative to the chassis. A second connection includes a load sensor (30) which senses horizontal load placed upon the carrier element. Implement connector elements such as drawbars (22) and connector plates (15) are attached to the carrier in a fixed positional relationship. The horizontal load is isolated from the vertical load and measured by the load sensor to provide load information which can be utilised by brake systems for example.

Abstract: A rear hitch assembly (10) for an agricultural tractor is provided. The assembly comprises a drawbar carrier element (20) mounted to the underside of a chassis (13) by a first connection which permits fore and aft movement of the carrier element relative to the chassis. A second connection includes a load sensor (30) which senses horizontal load placed upon the carrier element. Implement connector elements such as drawbars (22) and connector plates (15) are attached to the carrier in a fixed positional relationship. The horizontal load is isolated from the vertical load and measured by the load sensor to provide load information which can be utilised by brake systems for example.

Abstract: The mechanism such as a motor or a pump comprises a cam (10) and a cylinder block (12) which has a plurality of cylinders (14A, 14B, 14) connected to communication orifices (34A, 35A; 34B, 35B) disposed in a communication face (18). The mechanism further comprises a fluid distributor (20) having a distribution face (22) which is provided with distribution orifices (31A-31F, 32A-32F) suitable for being connected to the feed or to the discharge. The communication orifices and the distribution orifices communicate with one another as the cylinder block and the distributor rotate relative to each other. At least certain cylinders (14A, 14B) are connected to at least two communication orifices (34A, 35A; 34B; 35B) spaced apart angularly (?) so that they communicate simultaneously with respective distribution orifices connected to the feed or to the discharge.

Abstract: The mechanism such as a motor or a pump comprises a cam (10) and a cylinder block (12) which has a plurality of cylinders (14A, 14B, 14) connected to communication orifices (34A, 35A; 34B, 35B) disposed in a communication face (18). The mechanism further comprises a fluid distributor (20) having a distribution face (22) which is provided with distribution orifices (31A-31F, 32A-32F) suitable for being connected to the feed or to the discharge. The communication orifices and the distribution orifices communicate with one another as the cylinder block and the distributor rotate relative to each other. At least certain cylinders (14A, 14B) are connected to at least two communication orifices (34A, 35A; 34B; 35B) spaced apart angularly (?) so that they communicate simultaneously with respective distribution orifices connected to the feed or to the discharge.