DRIVE FOR FAN Russian patent published in 1995 - IPC

FIELD: mechanical engineering. SUBSTANCE: braking unit is mounted on the fan drive between the rear cover of electric motor 1 and its impeller. The unit consists of two clutch parts 9 and 11 provided with curved grooves 14 and 15 made in mutually facing surfaces. Wedging bodies are interposed between the grooves. In operation, wedging bodies 16 rotates in one of the semi-spherical ends of groove 14. In so doing, clutch part 11 freely rotates with respect to fixed clutch part 9. During braking, when the working wheel rotates in opposite direction, wedging bodies 16 enter wedge-shaped space between the surfaces of grooves 14 and 15. The working wheel stops. EFFECT: enhanced reliability. 2 cl, 2 dwg