3-2
DRIVE UNIT
■ Difference from previous models
The drive unit size has been reduced by changing the train of gears from that on previous models, and the
motors LH and RH are arranged transversely on the same axis.
■ General
1. The drive unit adopted for new models has transversely installed traveling motors similarly as on
previous models.
2. Changing the gear train from the previous 4-axis, 3-stage to the 2-axis, 2-stage reduction mechanism
with semi-built-in traveling motors has reduced the drive unit size.
3. Hypoid gear oil (API: GL-4, SAE: 75W-85W) is adopted as the common lubricant for all models (same
as for previous models).
■ Structure
Gears
• First-stage reduction adopts the helical gear featuring high transmission efficiency.
• Second-stage reduction adopts the planetary gear featuring high space efficiency.
■ Drive unit structural drawing
Reduction ratio New models Previous models
All models 27.040 17.482
Second axis
(Front axle shaft)
First axis
(Motor input shaft)
Drive motor
Helical gear
Planetary gear
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