| 摘要 |
<p>An electromagnetically operated friction clutch is disclosed of the type including an axially movable armature member which is drawn into frictional driving engagement with a friction surface on an inner body to establish drive through the clutch, in which a torque overload deenergization of the electromagnetic coil is provided. The clutch is provided with a torque boosting arrangement in which drive from the axially movable armature is transmitted through the series of balls disposed in corresponding pockets formed in a radial face of the armature and an opposing radial face of a clutch element drivingly connected to one of the primary clutch members. The action of the balls in the pockets creates a torque boosting effect increasing the engagement pressure exerted on the frictional engagement surfaces. The torque overload release arrangement includes a mounting of the clutch element In axially and rotationally restrained by means of a spring element. The axial movement of the clutch element against the spring bias In response to the transmission of a particular level of torque is employed to sense a torque overload condition, and by positioning a microswitch activated by a predetermined extent of axial movement of the clutch element, the electromagnetic coil is deenergized at a predetermined torque level. The clutch may be reenergized at high speed by a manual switch reenergizing the coil relay, drawing the friction surfaces into engagement.</p> |
