Torque Proportioning Differential - Komatsu WA250-6 Shop Manual

200 Power train

Torque proportioning differential

Torque proportioning differential

Outline
A 4-wheel-drive wheel loader, as a construc-
q
tion machine, must naturally work on places
where the ground condition is bad. If its tires
slip in such places, its function lowers and the
lives of the tires are shortened. To solve this
problem, the torque proportioning differential is
used.
Pinion (4) of this differential has an odd num-
q
ber of teeth. The meshing points of pinion (4)
and side gears (3) change according to the dif-
ference of the road resistance. Consequently,
the traction forces of the tires on both sides
change.
WA250, 250PZ-6
Operation
Straight travel (When the road resistances
under both tires are the same)
When the road resistances under the both tires
q
are the same, distance (a) from pinion (4) to
the meshing point of left side gear (7) and dis-
tance (b) to the meshing point of right side
gear (3) are the same.
Accordingly, left traction force (TL) and right
q
traction force (TR) are balanced.
Travel on soft ground (When the road resis-
tances under both tires are different)
When the tires slip on soft ground, the side
q
gear of the tire on the less road resistance side
turns forward. As a result, the meshing points
of pinion (4) and the side gears change.
If left side gear (7) turns forward a little, dis-
q
tance (a) from the pinion to the meshing point
of the left side gear becomes longer than dis-
tance (b) to the meshing point of the right side
gear, and then (a) and (b) are balanced at a
point where (a) x (TL) = (b) x (TR). The ratio of
(a) : (b) changes up to 1 : 1.38, depending on
the meshing condition.
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