| 摘要 |
A centrifugal clutch for coupling a drive shaft ( 11 ) to a driven member ( 13 ) at rotary speeds above a predetermined threshold, comprising: a centrifugal slider ( 15 ) with a massive enlargement ( 155 ) at one end and a first coupling formation ( 156 ) preferably at the other end; a frame ( 12 ) formed to carry the centrifugal slider on formations ( 121, 122, 123, 124 ) to constrain it to sliding motion between an extended radial position and a retracted radial position, and to fit on the drive shaft to be driven by it, with the shaft at right-angles to the axis of sliding motion of the frame: an output drive member mountable for free rotation on the drive shaft and formed for driving engagement with the driven member in use, and formed with a second coupling formation ( 131 ) which connects drivingly with the first only when the centrifugal slider is at its extended position; and means ( 16 ) preferably located wholly within a recess ( 151 ) in the centrifugal slider, for biasing the centrifugal slider toward its retracted position; whereby rotation of the centrifugal slider and frame causes the massive enlargement to pull the centrifugal slider radially from its retracted to its extended radial position to cause the first ( 155 ) and second coupling arrangements to interengage and thus to transmit rotary drive from the drive shaft to the driven member, but the biasing means causes disengagement when the rotation ceases, so as to decouple the drive shaft from the driven member.
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