Figure 29-11. Axle Configurations.
ends of the axle shafts transmit only turning effort, or
the car. Because the wheel is keyed rigidly on a taper at
torque, and are not acted upon by any other force. They
the end of the axle shaft, as in the semifloating axle, the
are said to be floated. The wheels are keyed to the outer
stresses caused by turning, skidding, and wobbling of the
ends of the axle shafts, and the outer bearings are
wheels still are taken by the axle shaft.
between them and the housing, as In the plain live axle.
e. Full Floating (D, Fig. 29-11). The full-floating
The axle shafts take the stresses caused by turning,
skidding, or wobbling of the wheels. In both the plain
rear axle is used on most heavy trucks. It is the same as
and semifloating live axles, a wheel can come off if an
the three-quarter floating axle, except that each wheel is
axle shaft breaks or twists off.
carried on the end of the axle tube on two ball or roller
bearings and the axle shafts are not connected rigidly to
d. Three-Quarter Floatlng (C, Fig. 29-11). The
the wheels. Each wheel is driven through a dog clutch,
three-quarter floating rear axle is used on a few
through a spline clutch, or through a flange on the end of
passenger cars. The Inner ends of the axle shafts
the axle shaft that is bolted to the outside of the wheel
sometimes are secured with nuts and the axle shafts
hub. The latter construction is used frequently but is not
cannot be withdrawn without removing the differential
truly full floating, because there is a rather rigid
cover. In other designs, the axle shaft can be withdrawn
connection between the axle shaft and the wheel hub.
after the nuts holding the hub flange have been
With the true full-floating axle, the axle shaft transmits
removed. The wheels, however, are supported by
only the turning
bearings on the outer )ends of the axle tubes. The
housing, Instead of the axle shafts, carries the weight of