First Gear

First gear





Gear rotation speed





^ Suppose gear ratio in first gear is i1, i1=NS/NC
^ From the result NR=0 in formula (1), the relation between the gear ratio in first gear and the rotation speed of the planetary gear set is indicated in the formula below.
(ZRF+ZSF) NC=ZSFNS
Therefore,
i1=NS/NC= (ZRF+ZSF) /ZSF= (89+49) /49=2.8163
As a result, the gear ratio in first gear is 2.816.