Abstract: The invention relates to a system for the hydraulic control (10) of a clutch (12), e.g. a motor vehicle clutch, comprising an upstream master cylinder (14) which is connected to a down-stream slave cylinder (18) by means of a conduit (16). The invention is characterized in that the system comprises a servo cylinder (30) which is disposed in the conduit (16) between the master cylinder (14) and the slave cylinder (18), said servo cylinder comprising at least one servo piston which can be subjected to an assist force produced by a servo device.

Abstract: Transmission including a dual clutch transferring the torque of an engine to two input primary shafts of a gearbox, each clutch including one disk connected in rotation to one of the primary shafts, that can be tightened between plates of which one is axially mobile thanks to a control mechanism, one of these control mechanisms including a piston guided by a cylindrical surface integrated into an axial housing of a primary shaft, characterised in that the guiding cylindrical surface is located as close as possible to the shaft's housing, this surface being directly made inside the shaft's housing or inside a body inserted into the housing which end is connected to the casing of the gearbox via a fastening shifted outside the housing.

Abstract: The invention concerns a gearbox comprising two primary shafts (2, 4), each connected to a clutch (C1, C2) coupled to an engine, and at least one secondary shaft (10), each primary shaft (2, 4) capable of being rotatably coupled with a secondary shaft (10), by the engagement of two ratios which in direct use constitute two gears of the gearbox. The invention is characterized in that the primary shafts can be rotatably linked with each other along a common rotational direction, through the engagement of two transfer links (T1, T2) arranged on the auxiliary shaft (30), each being implemented by the engagement of a single synchronizing sleeve (16, 22), the first transfer link (T1) providing from the rotation of the first primary shaft (2) a reduced speed of the second primary shaft (4), the second transfer link (T2) providing a greater reduction of the speed of the second primary shaft (4).

Abstract: The invention relates to a system for the hydraulic control (10) of a clutch (12), e.g. a motor vehicle clutch, comprising an upstream master cylinder (14) which is connected to a down-stream slave cylinder (18) by means of a conduit (16). The invention is characterized in that the system comprises a servo cylinder (30) which is disposed in the conduit (16) between the master cylinder (14) and the slave cylinder (18), said servo cylinder comprising at least one servo piston which can be subjected to an assist force produced by a servo device.

Abstract: An automated transmission device with torque transfer having an input shaft (18) that supports drive pinions (20), each of which is engaged with a driven pinion (22) that is mounted freely rotating on a output shaft (12); controlled unidirectional locking mechanism (24) which are mounted between the shaft (12) and the driven pinions (22); and mechanical device for activating the locking mechanisms (24) in a positive manner including at least one cam (26) which translationally moves inside the output shaft (12).

Abstract: A hydrokinetic coupling apparatus for a motor vehicle including a crankcase (12), designed to link in rotation, about an axis X, an input shaft to an impeller wheel; a turbine wheel (18) designed to be linked in rotation to an output shaft (16) via hub (14) and a flange (24) transversely oriented extending radially outwards relative to the hub; a lockup clutch (28) coupling the input and output (16) shafts comprising a piston (30) for releasably connecting the turbine wheel (18) to a substantially transverse wall (20) of the crankcase (12) against which the piston (30) is urged to lock the coupling; and at least a friction stop (68) interposed axially between the turbine wheel (18) and the piston (30). A friction stop (68) is arranged radially beyond the outer periphery (100) of the flange (24).

Abstract: A transmission between a gear (22) mounted freely to rotate about a shaft and a one-way drive-lock mechanism (26) for engaging in rotation the gear (22) and its shaft in a rotational direction, including a ring (52) integral in rotation with the shaft and bearing on its radial surface (54) at least two dogs (58) pivotally mounted about radial axes (62) between rest and locking positions on the gear (22) wherein they prevent the gear from rotation relative to the shaft. The invention is particularly applicable to transmission systems for a motor vehicle.

Abstract: A hydrokinetic coupling apparatus for a motor vehicle including a crankcase (12), designed to link in rotation, about an axis X, an input shaft to an impeller wheel; a turbine wheel (18) designed to be linked in rotation to an output shaft (16) via hub (14) and a flange (24) transversely oriented extending radially outwards relative to the hub; a lockup clutch (28) coupling the input and output (16) shafts comprising a piston (30) for releasably connecting the turbine wheel (18) to a substantially transverse wall (20) of the crankcase (12) against which the piston (30) is urged to lock the coupling; and at least a friction stop (68) interposed axially between the turbine wheel (18) and the piston (30). A friction stop (68) is arranged radially beyond the outer periphery (100) of the flange (24).

Abstract: The invention relates to an automated transmission device with torque transfer, in particular for a motor vehicle, comprising an input shaft (18) that supports drive pinions (20), each of which is engaged with a driven pinion (22) that is mounted freely rotating on a output shaft (12); controlled unidirectional locking mechanisms (24) which are mounted between the shaft (12) and the driven pinions (22); and mechanical means for activating said mechanisms (24) in a positive manner comprising at least one cam (26) which moves translation inside the driven shaft (12).

Abstract: An automated gear drive, comprising two main gearshafts (18, 20) bearing drive pinions (22, 24) and linked each by a clutch (E1, E2) to a clutch shaft (10), a gearbox output shaft (12) bearing driven pinions (26) each of which is associated with one-way locking device (28) controlled to be selectively interlocked with the gearbox output shaft (12), the one-way locking device (28) being controlled by mechanical device (30, 32, 34) common to all the loose pinions (26) of the different gear ratios. The automated gear drive enables in particular gear ratio shift with uninterrupted torque transmission to the gearbox output shaft (12).

Abstract: The invention concerns a transmission between a gear (22) mounted freely rotating about a shaft and a one-way drive-lock mechanism (26) for engaging in rotation the gear (22) and its shaft in a rotational direction, said mechanism comprising a ring (52) integral in rotation with the shaft and bearing on its radial surface (54) at least two dogs (58) pivotally mounted about radial axes (62) between rest and locking positions on the gear (22) wherein they prevent the gear from rotation relative to the shaft. The invention is applicable in particular to transmission systems for motor vehicles.

Abstract: The invention concerns an automated gear drive, comprising two main gearshafts (18, 20) bearing drive pinions (22, 24) and linked each by a clutch (E1, E2) to a clutch shaft (10), a gearbox output shaft (12) bearing driven pinions (26) each of which is associated with one-way locking means (28) controlled to be selectively interlocked with the gearbox output shaft (12), said means (28) being controlled by mechanical means (30, 32, 34) common to all the loose pinions (26) of the different gear ratios. The invention enables in particular gear ratio shift with uninterrupted torque transmission to the gearbox output shaft (12).