Patent ID: 8636127

Claim:
A fan drive device, comprising: an impeller wheel; at least one retaining element configured to be fastened to an engine unit, the at least one retaining element comprising a cavity; at least one housing element having a fluid storage space, a bore, and a torque-transmitting space therein, the fluid storage space being in fluidic connection with the torque-transmitting space via the bore, wherein the at least one housing element is rotatable relative to the at least one retaining element; an output disk connected to the impeller wheel and selectively connectable to the at least one housing element such that the at least one housing element selectively transmits a torque to the output disk by fluid friction created using a fluid; a valve element comprising a valve lever disk that is rotatably connected to the at least one housing element and configured to control whether the bore is in fluidic connection with the storage space; and an actuator, at least a portion of which is inside the cavity of the at least one retaining element, the actuator being configured to selectively activate the valve element.