Patent ID: 7497310
Filing Date: 2009-03-03
Classification: F16D

Abstract:
1. A friction clutch for a fan impeller hub comprising: at least a first clutch and an eddy current clutch; a driving flange connected directly to a drive element and having at least a first friction-disk section and a second friction-disk section; the first friction-disk section engagably connecting the fan impeller hub to the driving flange via the first clutch; the second friction-disk section engagably connecting the eddy current clutch to the driving flange, the eddy current clutch comprising an eddy-current part and a permanent magnet part which can be moved relative to the eddy-current part, the permanent magnet part is arranged in the axial direction between the fan impeller hub and the driving flange; and a roller bearing connecting the drive element to the fan impeller hub, the roller bearing providing a friction force, wherein, the fan impeller hub is driven directly by the driving flange when the first clutch is engaged, the fan impeller hub is driven to a first take-up speed when the first clutch is disengaged and the eddy current clutch is engaged, and the fan impeller hub is driven to a second take-up speed by friction force when the first clutch and eddy current clutch are disengaged.