Hitachi ZW180, Technical Manual

Page: 352 / 374

COMPONENT OPERATION / Axle
T3-10-4
•
Principle of Differential
Operational principle of the differential is explained
comparing it to the racks and the pinion gear in the
drawing.
When load W is equally applied to racks A and B, if
C is moved upward by the distance of H, racks A
and B move by the same distance of H in unison
with the pinion together.
If moved by removing the load to rack B, the pinion
rotates on rack A (with load applied) and moves rack
B upward. At this time, the distance where rack B
moves is longer than the distance where the pinion
moves while rotating.
Distance where rack B moves can be calculated by
using the equation of H
+
H
=
2H. This principle is ap-
plied to the differential.
•
Operation of Differential
In Traveling Straight
In case resistances applied to axle shafts (7, 8)
connected by spline to differential side gears (2, 3)
are the same, or in case the vehicle body is travel-
ing straight on plane roads, differential pinion gears
(1, 4) do not rotate.
Differential pinion gears (1, 4) and side gears (2, 3)
remain fixed by being mutually geared, and rotate
with housing (6) connected with ring gear (9).
In case all parts are rotating solidly like this, the dif-
ferential function of the differential does not work,
and gears (1, 2, 3, 4) play only the role of joints to
connect axle shafts (7, 8).
T202-03-05-006
T487-03-06-014
W
H
H
H
2H
C
C
Rack (B)
Pinion Pinion
Rack (A)
W W
Rack (B) Rack (A)
10
1
7 2
6 4
3
8
9