Mazda Automatic Transaxle JA5A-EL. Manual - part 9

AUTOMATIC TRANSAXLE 

K–17

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)

K–18

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 

K–19

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=i4’xiRD=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

K–20

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