Mazda Automatic Transaxle JA5A-EL. Manual — part 9
AUTOMATIC TRANSAXLE
K17
K
Planetary gear setting
The rotation speed is "0" for "fixed" as it does not rotate.
Taking i3 as the gear ratio in third gear,
i3 = Rear planetary gear ratio (i3') x Reduction planetary gear ratio (iRD)
i3=NRR/NRC
According to the setting of the planetary gear in third gear, "NRR = NRS".: condition B
• Here we substitute condition B in formula (1)
(ZRR+ZRS)xNRC=ZRRxNRS+ZRSxNRS
(ZRR+ZRS)xNRC=(ZRR+ZRS)xNRS
i3=NRS/NRC=(ZRR+ZRS)/(ZRR+ZRS)=1.000
Therefore, i3 shall be as follows:
i3=(ZRR+ZRS)/(ZRR+ZRS)x(ZDR+ZDS)/ZDR
=(75+42)/(75+42)x(85+31)/85
=1.365
Planetary gear unit
Front
Rear
Reduction
Internal gear
NRR (input)
NDR (input)
Planetary carrier
NRC (output)
NDC (output)
Sun gear
NRS (input)
NDS (fixed)
K18
AUTOMATIC TRANSAXLE
Fourth gear
Planetary gear setting
The rotation speed is "0" for "fixed" as it does not rotate.
Taking i4 as the gear ratio in fourth gear,
i4 = Front planetary gear ratio (i4') x Reduction planetary gear ratio (iRD)
i4=NFC/NFR
• According to the setting of planetary gear in fourth gear, substitute "NFS = fixed = 0".
(ZFR+ZFS)xNFC=ZFRxNFR
i4=NFC/NFR=ZFR/(ZFR+ZFS)
Therefore, i4 shall be as follows:
i4=ZFR/(ZFR+ZFS)x(ZDR+ZDS)/ZDR
=74/(74+34)x(85+31)/85
=0.935
Planetary gear unit
Front
Rear
Reduction
Internal gear
NFR (output)
NDR (input)
Planetary carrier
NFC (input)
NDC (output)
Sun gear
NFS (fixed)
NDS (fixed)
AMU0517A515
AUTOMATIC TRANSAXLE
K19
K
Fifth gear
Planetary gear setting
The rotation speed is "0" for "fixed" as it does not rotate.
Taking i5 as the gear ratio in fifth gear,
i5 = Front planetary gear ratio (i5') x Reduction planetary gear ratio (iRD)
Since the setting of front planetary gear is the same as that in fourth gear, "i5 = i4". (Formula is omitted.)
• According to the setting of reduction planetary gear in fifth gear, substitute "NDC = NDS".: condition C
• Here we substitute condition C in formula (1)
(ZDR+ZDS)xNDC=ZDRxNDR+ZDSxNDC
iRD=NDR/NDC=(ZDR+ZDS)/(ZDR+ZDS)=1.000
Therefore, i5 shall be as follows:
i5=i4xiRD=ZFR/(ZFR+ZFS)x(ZDR+ZDS)/(ZDR+ZDS)
=0.685
Planetary gear unit
Front
Rear
Reduction
Internal gear
NFR (output)
NDR (input)
Planetary carrier
NFC (input)
NDC (output)
Sun gear
NFS (fixed)
NDS (output)
AMU0517A516
K20
AUTOMATIC TRANSAXLE
Reverse
Planetary gear setting
The rotation speed is "0" for "fixed" as it does not rotate.
Taking iR as the gear ratio in reverse gear,
iR = Front planetary gear ratio (iR') x Reduction planetary gear ratio (iRD)
iR=NFS/NFR
• According to the setting of planetary gear in reverse gear, substitute "NFC = fixed = 0".
0=ZFRxNFR+ZFSxNFS
iR=NFS/NFR=-ZFR/ZFS
Therefore, iR shall be as follows:
iR=-ZFR/ZFSx(ZDR+ZDS)/ZDR
=-74/34x(85+31)/85
=-2.970
End Of Sie
Planetary gear unit
Front
Rear
Reduction
Internal gear
NFR (output)
NDR (input)
Planetary carrier
NFC (fixed)
NDC (output)
Sun gear
NFS (input)
NDS (fixed)
AMU0517A517
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