Hydraulic unit

A hydraulic unit comprising:

• a housing;
• a hydraulic converter accommodated in the housing, wherein the hydraulic converter is coupled with a drive shaft, wherein the drive shaft comprises a connecting shaft piece located outside the housing for connection to a mechanical drive element,
• wherein the housing houses a clutch for coupling and uncoupling the connecting shaft piece to and/or from the hydraulic converter,
• wherein the clutch comprises a first clutch part and a second clutch part which are rotatably supported relative to each other by an anti-friction bearing formed by two roller bearings radially inside the clutch, wherein the first and second clutch parts overlap with each other in a radial direction, wherein clutch elements achieving a non-rotatable engagement are positioned radially outwardly from the anti-friction bearing supporting the first and second clutch parts and overlap with the first and second clutch parts when viewed in a radial direction, wherein the anti-friction bearing overlaps with the clutch elements when viewed in a radial direction,
• wherein the drive shaft comprises an inner drive shaft piece in the interior space of the housing, which is non-rotatably connected with the hydraulic converter and is releasably non-rotatably connectable with the connecting shaft piece by the clutch,
• wherein the inner drive shaft piece and the connecting shaft piece are arranged coaxially to each other,
• wherein the clutch is arranged radially on the outside above the inner drive shaft piece and outside above the external connecting shaft piece,
• wherein the connecting shaft piece has a cup-shaped portion surrounding an end of the inner drive shaft piece and ending at the clutch,
• wherein the clutch overlaps with the connecting shaft piece and the inner shaft piece when viewed in a radial direction,
• a first lubricant supply line for supplying lubricant to the anti-friction bearing extends in a longitudinal direction through the inner drive shaft piece, the first lubricant supply line leading to the anti-friction bearing,
• a second lubricant supply line extending through the inner drive shaft piece to supply pressurized hydraulic fluid to a clutch actuating chamber to actuate the first and second clutch parts relative to each other,
• wherein the clutch comprises an energy-autarkical pretensioning device for pretensioning the clutch into the engaged position and an actuator for moving the clutch into the disengaged position against the pretension of the pretensioning device, and
• wherein the actuator and the clutch actuating chamber overlap with the pretensioning device but not with the first and second clutch parts when viewed in a radial direction.