Second Gear

Second gear





Gear rotation speed





Note:
^ The front internal gear and the rear planetary carrier are integrated.
^ The front planetary carrier and the rear internal gear rotate at the same speed.

^ Suppose the reduction ratio on the main shifting side is i2,





^ From formula (1), the relation between the gear ratio in second gear and the rotation speeds of the front and the rear planetary gear sets is indicated in formulas (2) and (3).





^ From the result NSR=0 in formula (3).





^ Here we substitute formula (4) in formula (2).





Therefore,





^ Because the reduction ratio on the main shifting side is transmitted from the primary gear to the secondary gear, it can be calculated using the following formula:
The reduction ratio of the primary/secondary gear A = the number of primary gear teeth/the number of secondary gear teeth
Therefore,
A=82/86=0.9535
^ Suppose the reduction ratio on the sub-shifting side is ii2,





^ From the result NSS=0 in formula (1), the rotation speed of the secondary planetary gear unit can be calculated using the following formula.





Therefore,





And the reduction ratio of





As a result, the reduction ratio of 2nd gear is 1.925.