Abstract
The mechanism of planetary gears is so complicated that an unbalanced force due to various errors occurs on the planetary gears. However, the causes of the unbalanced force of solar-type planetary gears have not yet been adequately clarified. Therefore, in the present study, using solar-type planetary gears for a bicycle, in order to elucidate the factors of unbalanced force, and to improve the performance of planetary gears for a bicycle, the bending vibrating displacement of the sun gear shaft was measured. Simultaneously, a simple measuring method of bending vibrating displacement at the end of the sun gear shaft from outside the planetary gears was developed. Furthermore, in order to investigate the effects of various machining errors and the direction of runout error of the planet gear and those of loaded torque and change in speed of the drive shaft, the bending vibrating displacement at the end of the sun gear shaft for two types of planetary gear sets was measured. The above investigations provided several useful results.
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