Viscous fluid clutch having heat dissipation means

Claim 1

A DRIVE COUPLING COMPRISING FIRST AND SECOND RELATIVELY ROTATABLE COUPLING MEMBERS, SAID FIRST COUPLING MEMBER DEFINING A FLUID CHAMBER IN WHICH SAID SECOND COUPLING MEMBER IS ROTATABLE, SAID FIRST AND SECOND COUPLING MEMBERS HAVING OPPOSED SPACED PARALLEL SURFACES DEFINING A FLUID SHEAR SPACE THEREBETWEEN AND COOPERABLE WITH A FLUID SHEAR MEDIUM IN SAID SHEAR SPACE TO PROVIDE A SHEARTYPE FLUID DRIVE THEREBETWEEN, MEANS FOR VARYING THE VOLUME OF FLUID SHEAR MEDIUM IN SAID SHEAR SPACE TO VARY THE TORQUE TRANSMITTED BETWEEN SAID FIRST AND SECOND COUPLING MEMBERS INCLUDING A TEMPERATURE RESPONSIVE DEVICE LOCATED ON A FORWARD FACE OF SAID FIRST COUPLING MEMBER AND RESPONSIVE TO THE TEMPERATURE OF THE ATMOSPHERE ADJACENT SAID FORWARD FACE TO EFFECT A CHANGE IN THE VOLUME OF THE FLUID SHEAR MEDIUM IN SAID SHEAR SPACE, A PLURALITY OF BLOWER BLADE MEANS DISPOSED CIRCUMFERENTIALLY ABOUT AND IN SURROUNDING RELATION TO SAID TEMPERATURE RESPONSIVE DEVICE AND CONNECTED TO SAID FIRST COUPLING MEMBER, SAID BLOWER BLADE MEANS BEING INCLINED WITH RESPECT TO A RADIAL LINE EXTENDING THROUGH THE AXIS OF ROTATION OF SAID COUPLING MEMBERS FOR CREATING A FLOW OF AIR ACROSS SAID TEMPERATURE RESPONSIVE DEVICE TO PREVENT STAGNATION OF AIR AROUND SAID TEMPERATURE RESPONSIVE DEVICE.