| 摘要 |
PURPOSE:To improve the cooling effect by providing a rib which extends on the outer surface of an eddy current cylinder with axial component, and forming a cutting edge at the end of the rib, thereby effectively utilizing cooling water. CONSTITUTION:A motor 2 is driven to rotate an eddy current cylinder 1. When current is flowed through an exciting coil 6 in this state, a pole 4 rotates at the speed relative to the magnitude of the current, thereby transmitting torque to the output shaft 5. A plurality of ribs 1d which exially lead cooling water from a spray port 14 are formed on the outer periphery of the cylinder 1, a drip 1e is provided at the opening side, and a drip plate 17 is provided on a sheath 9 faced with the inside. Accordingly, the water flows axially along the ribs 1d to increase the contacting time so as to cool the cylinder 1, and the yoke 7 is cooled by the water introduced into a pocket formed by the cutting edge 1e, thereby largely improving the cooling effect. |
