A Study on Vibration of Planetamy Gear Transmission for Bicycle

The number of bicycle equipped with a planetary gear transmission is tending to increase with each passing year. And the demand for this kind of transmission has been increasing. However, in some of products, there are cases that stepping on the pedal causes the unconfortable vibration on a sole. Therefore, there is a stronger need to clear up the causes of unconfortable vibration and to develop an easy measuring method for the planetary gear transmission with the assembled state. So the unconfortable vibration were measured by using a strain gage, non-contact type displacement converter and accerelation type vibration meter. Consequently, the measured values of the non-contact type displacement converter are approximetely similar to that of strain gage, it was shown that the utility of measured result of non-contact type displacement converter. Furthermore, the bending fluctuation of sun gear shaft in the planetary gear transmission without unconfortable vibration (OK) and that with unconfortable vibration (NG) were measured. And it was shown that the effect which loaded torque and the number of revolution gave to the unconfortable vibration.