| 摘要 |
PROBLEM TO BE SOLVED: To solve problems of a conventional spring clutch comprising a number of parts in which sharp reduction of manufacturing cost is difficult, and in which actuation becomes unstable by thermal expansion difference between parts of synthetic resin and a coil spring of metal to deteriorate clutch characteristics. SOLUTION: This arm type ratchet clutch is an on/off type clutch, it comprises an input shaft 10 and an output shaft 20, and the input shaft 10 comprises an input gear 11, a hub part 12, and a ratchet gear 13. The output shaft 20 comprises a follower shaft part 21, a cylindrical part 22, a large diameter part 23, an elastic arm part 24, etc. A spiral slit 33 is formed between the cylindrical part 22 and the elastic arm part 24, and between the elastic arm part 24 and the large diameter part 23 for forming the elastic arm part 24 in arc form, a ratchet claw 25 is formed at an inner surface part of the elastic arm part 24, a control claw 26 controlled by a movable operation lever to be driven to advance/retract by a solenoid actuator, unillustrated, is formed at an outer circumferential part of the elastic arm part 24, and a stopper mechanism 27 is provided.
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