Fluid clutch

A fluid clutch comprising a driving section, a rotational shaft rotatably driven by said driving section, a cooling device for cooling said driving section, a driving disc rigidly mounted to and rotationally driven by said rotational shaft, a casing in which said driving disc is incorporated and which is rotatably disposed around said rotational shaft as a center of rotation such that a torque transmission gap is defined between said driving disc and the casing, a blower attached to said casing, and an oil filled in the torque transmission gap defined between said driving disc and the casing for transmitting a driving torque from said driving disc to said casing, wherein

• the fluid clutch comprises an oil supply means for selectively supplying and returning said oil between the outside and the inside of said casing, and a control means for controlling the supply and return of said oil by said oil supply means at least based on the rate of rotation of said blower, the rate of rotation of said rotational shaft and the temperature of cooling water of said cooling device, said casing further including at least one breather extending through said casing between the torque transmission gap and atmospheric air for releasing gas from said torque transmission chamber when pressure in said torque transmission chamber exceeds a predetermined upper limit value and for enabling inflow of atmospheric air to said torque transmission chamber when pressure in the torque transmission chamber is less than a predetermined lower limit value.

A fluid clutch comprising a driving section, a rotational shaft rotatably driven by said driving section, a cooling device for cooling said driving section, a driving disc rigidly mounted to and rotationally driven by said rotational shaft, a casing in which said driving disc is incorporated and which is rotatably disposed around said rotational shaft as a center of rotation such that a torque transmission gap is defined between said driving disc and the casing, a blower attached to said casing, and an oil filled in the torque transmission gap defined between said driving disc and the casing for transmitting a driving torque from said driving disc to said casing, wherein

• the fluid clutch comprises an oil supply means for selectively supplying and returning said oil by way of an oil supply pipe between the outside and the inside of said casing, a data calculation means for calculating control data using at least the rate of rotation of the blower, the rate of rotation of the rotational shaft and the temperature of the cooling water of the cooling device as control signals and calculating the control data regarding the control for said oil supply means based on said control signal, and a control device for driving said oil supply means based on the control data obtained from the data calculation means, said casing further including at least one breather extending through said casing between the torque transmission gap and atmospheric air for releasing gas from said torque transmission chamber when pressure in said torque transmission chamber exceeds a predetermined upper limit value and for enabling inflow of atmospheric air to said torque transmission chamber when pressure in the torque transmission chamber is less than a predetermined lower limit value.