PLANETARY GEAR [CW6A-EL]

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Purpose/Function

•  The planetary gear is a mechanism which shifts the drive force from the engine. The planetary gear consists of multiple gears which rotate individually while revolving. By controlling the individual rotation and revolving of the gears, the transaxle performs gear shifting at the optimum gear speed according to the driving conditions.

Construction

•  The planetary gear is positioned in the order of the front planetary gear, rear planetary gear, and reduction planetary gear from the torque converter side.
•  The front planetary gear and rear planetary gear are a single- type, and the reduction planetary gear is a double pinion gear-type. For the component parts of each planetary gear, refer to the following figure.
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•  The planetary gear is composed of the sun gear, pinion gear, planetary carrier, and internal gear as shown in the figure.
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•  There are two types of pinion gear rotation, rotation (rotation) on an axis of the center for each pinion gear and rotation (revolution) on an axis of center for the planetary carrier. The planetary gear operates shifting function by switching the input, fixed, or output of the internal gear, pinion gear, and planetary carrier.
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•  The relation of rotation speed of each element for the planetary gear set is generally indicated as follows:
(ZR+ ZS) NC= ZR NR+ ZS NS: (1)
Meaning of symbols
―  Z: Number of teeth
―  N: Rotation speed
―  Additional character R: Internal gear
―  Additional character S: Sun gear
―  Additional character C: Planetary carrier (pinion gear)

Number of teeth and symbols for each gear

Planetary gear unit

Number of teeth

Symbols
Front
Internal gear
86
ZRFr
Planetary carrier (part of pinion gear)
26
ZCFr
Sun gear
34
ZSFr
Rear
Internal gear
89
ZRRr
Planetary carrier (part of pinion gear)
26
ZCRr
Sun gear
37
ZSRr
Reduction
Internal gear
109
ZRRed
Planetary carrier (part of pinion gear No.1)
22
ZCRed1
Planetary carrier (part of pinion gear No.2)
23
ZCRed2
Sun gear
49
ZSRed

Meaning of symbols

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Operation

1GR

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Rotation speed for each gear

Planetary gear unit

Front planetary gear
Internal gear
0 (Fix)
Planetary carrier
(part of pinion gear)
NCFr (Output)
Sun gear
NSFr (Input)

2GR

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Rotation speed for each gear

Planetary gear unit

Front planetary gear

Rear planetary gear
Internal gear
NRFr=NC
0 (Fix)
Planetary carrier
(part of pinion gear)
NCFr (Output)
NCRr=Nc
Sun gear
NSFr (Input)=NS
NSRr=NS

3GR

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Rotation speed for each gear

Planetary gear unit

Front planetary gear

Rear planetary gear

Reduction
Internal gear
NRFr=NC1
NRRr=Nc2
NRRed=Nc2
Planetary carrier
(part of pinion gear)
NCFr (Output)
NCRr=Nc1
0 (Fix)
Sun gear
NSFr (Input)=NS
NSRr=NS
NSRed=NS

4GR

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Rotation speed for each gear

Planetary gear unit

Front planetary gear
Internal gear
NRFr (Input)
Planetary carrier
(part of pinion gear)
NCFr (Output)
Sun gear
NSFr (Input)

5GR

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Rotation speed for each gear

Planetary gear unit

Front planetary gear

Rear planetary gear

Reduction
Internal gear
NRFr=NC1
NRRr=Nc2
0 (Fix)
Planetary carrier
(part of pinion gear)
NCFr (Output)
NCRr (Input)=Nc1
NCRed=Nc2
Sun gear
NSFr=NS
NSRr=NS
NSRed=Nc1

6GR

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Rotation speed for each gear

Planetary gear unit

Front planetary gear

Rear planetary gear
Internal gear
NRFr=NC
0 (Fix)
Planetary carrier
(part of pinion gear)
NCFr (Output)
NCRr (Input)=Nc
Sun gear
NSFr=NS
NSRr=NS

Reverse

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Rotation speed for each gear

Planetary gear unit

Front planetary gear

Rear planetary gear

Reduction
Internal gear
NRFr (Fix)
NRRr=Nc
0 (Fix)
Planetary carrier
(part of pinion gear)
NCFr (Output)
NCRr (Fix)
NCRed=Nc
Sun gear
NSFr=NS
NSRr=NS
NSRed (Input)