Hitachi ZW180 Technical Manual page 353

COMPONENT OPERATION / Axle
In Steering
When the vehicle body is turned, uneven resistances
are applied to the drive wheels. Therefore, due to the
difference of the resistances applied to the inner and
outer wheels, differential pinion gears (1, 4) start re-
10
9
volving on side gears (2, 3), while rotating round the
pinion shaft. Consequently, in case the resistance
1
force applied to shaft (7) is large, pinion gears (1, 4)
rotate in the same direction as the rotational direction
on side gear (2) of shaft (7). The speed of shaft (7) is
8
lowered, the amount of the speed reduction is applied
to shaft (8) and the differential function is performed.
Suppose ring gear (9) is driven by drive pinion (10) at
the speed of 100. In the condition of the vehicle body
traveling straight, the drive wheels on the both sides
2 7
3
rotate at the same speed.
However, in case the vehicle body is turned and the
speed of the right drive wheel is lowered to 90, the left
4 6
wheel turns at the speed of 100+(100−90)=110 as the
speed of 10(100−90=10) is added to the speed of the
T487-03-06-014
left wheel.
If ring gear (9) rotates at the speed of 100, the sum-
mation of the speeds of the left and right wheels be-
comes always 200 regardless of movement of the re-
spective wheels.
T3-10-5