Patent ID: 8596439

Claim:
A hydraulic coupling assembly for a driveline of a motor vehicle, comprising: a hydraulic assembly and at least one friction coupling which can be actuated by the hydraulic assembly, wherein the hydraulic assembly comprises at least one hydraulic actuating unit, at least one piston pump with a piston which is displaceably arranged in a housing, wherein, as a result of an oscillating movement of the piston, there is built up a hydraulic pressure for loading the at least one actuating unit, and a driveshaft with an axis of rotation and an eccentric; wherein the friction coupling comprises a first coupling part, a second coupling part which is rotatable relative to said first coupling part around the axis of rotation, and a pressure plate for loading the coupling parts, wherein the driveshaft of the hydraulic assembly is drivingly connected to one of the two coupling parts; wherein the eccentric of the driveshaft acts on the piston of the at least one piston pump such that a hydraulic pressure is built up when the driveshaft rotates, said hydraulic pressure loading the at least one hydraulic actuating unit for actuating the at least one friction coupling; wherein a spring mechanism resiliently loads the piston of the at least one piston pump towards the driveshaft, and the piston is pretensioned against a force of the spring mechanism upon rotation of the driveshaft; wherein the spring mechanism is configured such that, during a return stroke movement of the piston, hydraulic fluid is conveyed to the hydraulic actuating unit, depending on a volume requirement; wherein the piston pump comprises a first pump chamber which is delimited by the piston and which is hydraulically connected to the hydraulic actuating unit, wherein the spring mechanism loads the piston toward the first pump chamber to supply the hydraulic actuating unit with pressure; wherein the first pump chamber is positioned on a side of the piston that faces away from the spring mechanism; and wherein there is provided an accumulator assembly with an accumulator chamber, wherein the accumulator chamber is hydraulically connected to the first pump chamber of the at least one piston pump and can be filled by the at least one piston pump with a hydraulic fluid for generating a pre-pressure during a return stroke movement of the piston; wherein the driveshaft is integrally connected to one of the first coupling part or the second coupling part.