Lesson 2/Learning Event 2
Some light vehicles use only two spider pinions in the differential. A straight shaft,
instead of a four-fingered spider, supports the spider pinions. Something to remember is
that the side gears are free to turn on their bearing surfaces of the case and the spider
pinions are also free to turn on the spider cross-shaft.
FIGURE 19. SIDE GEARS.
Two types of differential gearing are in use in standard axle assemblies. The
conventional design gears deliver equal twisting effort or torque to each axle at all times,
and the high-traction type delivers variable torque to each side gear, depending on the
traction of the wheels. Notice in the conventional design that the teeth of the spider
pinions are placed opposite each other.