Hudson 1948 - 1952, Service Manual

Page: 212 / 333

9 - 4 OVERDRIVE
OPERATION
MECHANICAL
FREE-WHEELING DIRECT DRIVE
The transmission mainshaft, Figures 3 and 4, extends
through the sun gear and is spindled into the pinion cage
and roller clutch cam. The latter has 12 cam surfaces and 12
clutch rollers located against these surfaces by means of the
roller cage and the roller cage spring.
FIGURE 4
When a driving torque is applied against the cam, the
rollers are forced outward into wedging contact with the
outer race, Figure 5-A, thus driving the car. Under such
driving conditions, all the overdrive gears and their directly-
associated control parts revolve together as a unit.
On the other hand, if the throttle is closed, removing the
driving force, the rollers release their wedging contact,
Figure 5-B, permitting the roller clutch to overrun, with the
mainshaft, pinion cage, and engine turning at a slower speed
than the ring gear, output shaft and propeller shaft. Under
such conditions
FIGURE 5
the ring gear will turn faster than the pinion cage, and the sun
gear will turn slower than the latter. In fact, the sun gear may
turn forward, stand still, or turn backward, depending solely
upon the relative speeds of the transmission main shaft, and
the output shaft. If the former is turning at exactly 70% of the
FIGURE 6