GB1378417A - Protective overspeed torque coupling - Google Patents

Abstract

1378417 Positive clutches BORG-WARNER CORP 20 Dec 1972 58884/72 Heading F2C A coupling which disengages at a set speed by the action of centrifugal force, and remains disengaged until dismantled and reassembled comprises a driving flange 18 having a cylindrical driving member 22 fixed to it which in turn has a driving sleeve 34 bolted to it, and a driven member 24, attached to an output flange 18, the driven member having a driven sleeve 38 splined to it, the sleeves 34 and 38 being coupled by a ring 48 through meshing teeth 50. This ring 48 is axially movable under the action of springs 80 to disengage the clutch when support blocks 54 are moved by centrifugal force against adjustable springs 60. A latch 82 is moved by a . spring 84 to latch the ring 48 and hold it out of engagement when the ring is allowed to so move by the radial movement of blocks 54. The teeth 50 are shaped as shown in Figs. 4 and 5 with one set having concave sides (Fig. 5) with which concave sides of the other set register (not shown) and in cross-section (Fig. 4) the teeth are provided with chamfers 90 and a gable bottom 92 to strengthen them. The coupling is described incorporated in a drive between an electric motor and a pump, so that if liquid is forced through the pump and the motor driven thereby the coupling prevents the motor from overspeeding.