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POWER TRANSMISSION MECHANISM
PLANETARY GEAR UNIT
This unit is used for shifting during driving, and switching between forward, reverse, and neutral.
Unit is composed of a sun gear, planetary gear, and internal gear. This unit is provided on the front rear and by
combination of connections is able to perform forward, reverse, and shifting.
1. Sun gear
2. Planetary gear
3. Internal gear
4. Planetary carrier
(1) When the sun gear is fixed, the number of rotations of the
planetary carrier is less than that of internal gear.
(2) When the planetary gear is fixed, the number of rotations
of the sun gear is more than that of internal gear, and both
turn in reverse.
(3) When the internal gear is fixed, the number of rotations of
the sun gear is more than that of the planetary gear.
CLUTCH AND BRAKE
These connect and fix the constituent parts of the front and rear in order to perform shifting by the planetary gear unit.
The clutch, excluding the one–way clutch, and brake operate by hydraulic pressure which is switched by means of a
valve body, shift valve, or solenoid valve.
Operation overview
Forward
clutch
2nd brake
band
Direct
clutch
1st reverse
brake
One–way
clutch
Shift position
P
R ± ±
N
3
rd
gear ± ±
2
nd
gear ± ±
1
st
gear (D, 2 range) ± ±*
1
st
gear (L range) ± ±
*Operates only during acceleration
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