The number of planet gear is 20, the drive ratio is 7.5. The number of teeth of solar wheel and ring gear is required
You drive ratio is really strange, I figure out the sun gear number of 6 points Oh.
A gear train that has only one degree of freedom. A driver can determine actuator (planetary) movement, the original is usually the center wheel or tie;
That is in direct contact with the center of the planetary gear wheel or tied as the driving link drives a planetary gear, a planetary wheel around its axis of rotation O1-O1, on the other hand, with the development of component H (or tied) around a fixed axis (O-O axis rotary wheel center)