Patent ID: 7604106

Claim:
A fan clutch device that is removably mountable to a drive member, the fan clutch device comprising: a hub portion selectively movable in a rotational direction relative to a drive member when the fan clutch device is mounted to the drive member; a piston portion selectively movable in an axial direction relative to the drive member when the fan clutch device is mounted to the drive member; a spline connection between the hub portion and the piston portion; a channel in fluid communication with a fluid-receiving space at least partially defined by a surface of the piston portion; and a clutch ring including an outer frusto-conical surface and an inner frusto-conical surface that both have an increasingly larger radius as the clutch ring extends away from the drive member when the fan clutch device is mounted to the drive member, the clutch ring including a frictional engagement surface that is at least partially defined by one of the outer and inner frusto-conical surfaces.