A viscous fluid clutch comprising: - a clutch plate (101, 2) and a drive shaft (102, 1), the clutch plate (101, 2) being fixedly driven by the drive shaft (102, 1); - a housing (103, 3, 4) rotatably supported by the drive shaft (102, 1), the housing (103, 3, 4) surrounding the clutch plate (101, 2), the housing (103, 3, 4) comprising a work chamber defining a shear space for the viscous fluid between the housing (103, 3, 4) and the clutch plate (101, 2); - a storage chamber (106, 19) for the viscous fluid, whereby the storage chamber (106, 19) is comprised in the clutch plate (101, 2); - a viscous fluid supply connection and a viscous fluid return connection connecting the storage chamber (106, 19) and the work chamber, whereby the viscous fluid return connection and the viscous fluid supply connection are comprised within the clutch plate (101, 2); - a first valve (109, 14 A-D) located in the supply connection, the first valve (109, 14 A-D) permitting to selectively increase the quantity of viscous fluid present in the work chamber; characterized in that, the viscous fluid clutch is further comprising: - a second valve (110, 13 A-D) located in the supply connection and closing the supply passage when the drive shaft (102, 1) is at rest, the second valve (110, 13 A-D) being movable to an open position by a centrifuge force generated by rotation of the drive shaft (102, 1) exceeding a predetermined centrifuge force threshold; - a third valve (111, 21) located in the viscous fluid return connection, the third valve (111, 21) being a one-way valve selectively permitting the passage of viscous fluid from the work chamber to the storage chamber (106, 19) when the viscous fluid applies on the third valve (111, 21) a pressure which exceeds a predetermined viscous fluid pressure threshold; - a vent (112, 16) for venting gas from the storage chamber (106, 19) to the work chamber; whereby an enclosure comprising the connected storage (106, 19) and work chambers is hermetic. - a clutch plate (101, 2) and a drive shaft (102, 1), the clutch plate (101, 2) being fixedly driven by the drive shaft (102, 1); - a housing (103, 3, 4) rotatably supported by the drive shaft (102, 1), the housing (103, 3, 4) surrounding the clutch plate (101, 2), the housing (103, 3, 4) comprising a work chamber defining a shear space for the viscous fluid between the housing (103, 3, 4) and the clutch plate (101, 2); - a storage chamber (106, 19) for the viscous fluid, whereby the storage chamber (106, 19) is comprised in the clutch plate (101, 2); - a viscous fluid supply connection and a viscous fluid return connection connecting the storage chamber (106, 19) and the work chamber, whereby the viscous fluid return connection and the viscous fluid supply connection are comprised within the clutch plate (101, 2); - a first valve (109, 14 A-D) located in the supply connection, the first valve (109, 14 A-D) permitting to selectively increase the quantity of viscous fluid present in the work chamber; - a second valve (110, 13 A-D) located in the supply connection and closing the supply passage when the drive shaft (102, 1) is at rest, the second valve (110, 13 A-D) being movable to an open position by a centrifuge force generated by rotation of the drive shaft (102, 1) exceeding a predetermined centrifuge force threshold; - a third valve (111, 21) located in the viscous fluid return connection, the third valve (111, 21) being a one-way valve selectively permitting the passage of viscous fluid from the work chamber to the storage chamber (106, 19) when the viscous fluid applies on the third valve (111, 21) a pressure which exceeds a predetermined viscous fluid pressure threshold; - a vent (112, 16) for venting gas from the storage chamber (106, 19) to the work chamber;