| 摘要 |
A magnetic brake actuated spring clutch has an input shaft that is rotatably mounted in a housing, a coaxial output shaft that is rotatably mounted in the housing for rotation relative to the input shaft, and a coil spring surrounding a portion of the output shaft. The coil spring has one end attached to the input shaft and an opposite end attached to a rotor of a magnetic brake. The rotor is journalled on the output shaft, and the magnetic brake further includes a stator that is secured in the housing. The stator includes a permanent magnet and the rotor includes a copperplate that is juxtaposed the permanent magnet. The coil spring has a first part that is wound in one direction and a coaxial second part that is wound in an opposite direction so that the input shaft drives the output shaft in either direction when the spring clutch is engaged by input shaft via the magnetic brake. Alternatively, the stator may include a pair of spaced opposed magnets that are juxtaposed either side of the copper plate. A simple coil spring wound in one direction can be used to provide a one-way magnetic brake actuated spring clutch.
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