Planetary Gear Description: Operation: Reverse

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Fig 1: Identifying Reverse

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Reverse Gear

Courtesy of MAZDA MOTORS CORP.

iR=iR'xiRD

iR'=NFS/NFR

From the result of NFC=0 in formula (1), the relation between the gear ratio in reverse gear and the rotation speed of the planetary gear set is indicated in the formula below.
0=ZFRxNFR+ZFSxNFS

iR'=NFS/NFR=-ZFR/ZFS

iR=-ZFR/ZFSx(ZDR+ZDS)/ZDR

=-74/34x(85+31)/85

=-2.970