Gear Rotation Speed

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2006 Mazda MPV, 2005 Mazda MPV, 2004 Mazda MPV, 2004 Mazda 6, and 2003 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Gear Rotation Speed

Courtesy of MAZDA MOTORS CORP.

Suppose gear ratio in first gear is i₁

i1=Rear planetary gear ratio (i1') x Reduction planetary gear ratio (iRD)

From the result NRR=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.
(ZRR+ZRS)NRC=ZRSxNRS

i1'=NRS/NRC=(ZRR+ZRS)/ZRS

Next iRD

From the result NDS=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:
(ZDR+ZDS)NDC=ZDRxNDR

iRD=NDR/NDC=(ZDR+ZDS)/ZDR

Therefore,

i1=i1'xiRD=(ZRR+ZRS)/ZRSx(ZDR+ZDS)/ZDR=(75+42)/42x(85+31)/85=3.802