Kubota WSM STV32 Workshop Manual page 234

STV32 · STV36 · STV40, WSM
2. FINAL REDUCTION SYSTEM
The final reduction system has a planetary gear
system. It is compact, and is durable under heavy loads
since torque loads are spread over three gears,
decreasing the load on each tooth. And this system also
spreads the load evenly around the circumference of
the system, eliminating the sideways stress on the
shafts.
Power, transmitted from the differential side gear to
the brake shaft (4), drives the three planetary gears (3).
Since the internal gear (2) is fixed to the rear axle case,
the planetary gears (3) move around the teeth of the
internal gear (2) while rotating on their axes.
movement of the planetary gears around the internal
gear is transmitted to the rear axle through the planetary
carrier (1). As a result, the planetary carrier (1) and rear
axle rotate in the same direction as the brake shaft (4),
but at a reduced speed and increased torque.
(1) Planetary Carrier
(2) Internal Gear
4-M2
REAR AXLE
The
(3) Planetary Gear
(4) Brake SHaft
0000007596E
KiSC issued 04, 2006 A