Patent ID: 8839934

Claim:
A clutch for coupling an internal combustion engine in a torque transmitting fashion and decoupling the internal combustion engine, said internal combustion engine having a partial drive train which comprises an electric machine, wherein the clutch comprises: a closing unit configured to generate a closing force; an adjustment unit comprising at least one adjustable element configured to be opened counter to the closing force; an electrical drive configured to adjust the at least one adjustable element; and a locking unit that interacts with the adjustable element and has an adjustable locking element, said locking unit configured to interact with the adjustable element to: hold open a coupling unit without an opening force having to be applied to hold open the coupling unit by the adjustment unit, wherein holding open the coupling unit without an opening force is done without a holding current being drawn by the electrical drive; and reduce the opening force which has to be applied by the adjustment unit to hold the coupling unit open, wherein a hydraulic valve is opened by a control unit when the adjustment unit malfunctions so that the closing unit can close the coupling unit.