Abstract: Dual clutch transmission system, vehicle and method of cooling. A dual clutch transmission system, including coaxial first and second engageable and disengageable torque transmitting assemblies, configured to be installed in a power train of a vehicle, the system including a main flow path for supply of cooling fluid, wherein the main flow path branches into a first flow path for supply of cooling fluid to the first torque transmitting assembly, and a second flow path for supply of cooling fluid to the second torque transmitting assembly, wherein the system includes a third flow path for supplying cooling fluid, which is discharged from the second torque transmitting assembly, to the first torque transmitting assembly, the third flow path preferably being arranged within a space defined by a housing of the dual clutch transmission system.

Abstract: There is provided a shaft assembly for use in a dual clutch transmission system to be installed in a power train of a motor vehicle for selectively coupling three rotating transmission members, wherein the shaft assembly extends along a central axis and comprises: a transmission member comprising a first axial end and a second axial end relative to the central axis, wherein the first axial end is configured to be rotatably connected to a shaft part, a bore extending along the central axis from the first axial end in a direction towards the second end, wherein the bore is open at the first axial end and comprises a closed bore end opposite the first axial end, wherein the bore comprises a stepped closed bore end section in which a diameter of the bore decreases stepwise towards the closed bore end.

Abstract: A dual clutch transmission for a motor vehicle power train for selectively coupling rotating transmission members includes a base assembly, a bearing mounted rotating assembly which is rotatable with respect to the base assembly, first and second torque transmission assemblies movable between disengaged and engaged positions, and first and second actuation mechanisms associated with the first and second torque transmissions assemblies. The actuating mechanisms are arranged for moving the respective torque transmission assemblies between the disengaged and engaged positions for selectively coupling the transmission members. The first torque transmission assembly couples two rotating members in the engaged position. The first actuating mechanism includes a hydraulic actuating mechanism having a piston chamber and a piston for moving the first torque transmission assembly between the disengaged and engaged positions.

Abstract: Dual clutch transmission system, vehicle and method of cooling. A dual clutch transmission system, including coaxial first and second engageable and disengageable torque transmitting assemblies, configured to be installed in a power train of a vehicle, the system including a main flow path for supply of cooling fluid, wherein the main flow path branches into a first flow path for supply of cooling fluid to the first torque transmitting assembly, and a second flow path for supply of cooling fluid to the second torque transmitting assembly, wherein the system includes a third flow path for supplying cooling fluid, which is discharged from the second torque transmitting assembly, to the first torque transmitting assembly, the third flow path preferably being arranged within a space defined by a housing of the dual clutch transmission system.

Abstract: Actuation unit for a clutch system of a motor vehicle drivetrain including: a drive plate on an input shaft of the clutch system; a clutch piston arranged to actuate a clutch of the clutch system; a compensation chamber plate defining a compensation chamber; wherein the clutch piston separates a pressure chamber between the drive plate and the clutch piston from the compensation chamber between the clutch piston and the compensation chamber plate. The pressure chamber contains a hydraulic fluid for hydraulically actuating the clutch piston, and the compensating chamber is arranged to compensate centrifugal force pressure on the clutch piston. The compensation chamber plate is fixedly connected to the drive plate.

Abstract: Actuation unit for a clutch system of a motor vehicle drivetrain comprising: —a drive plate on an input shaft of said clutch system; —a clutch piston arranged to actuate a clutch of said clutch system; —a compensation chamber plate defining a compensation chamber; wherein said clutch piston separates a pressure chamber between said drive plate and said clutch piston from said compensation chamber between said clutch piston and said compensation chamber plate, said pressure chamber containing a hydraulic fluid for hydraulically actuating said clutch piston, and said compensating chamber being arranged to compensate centrifugal force pressure on said clutch piston, whereby said compensation chamber plate is fixedly connected to said drive plate.