Driving Wheel Assembly
The components of a driving wheel bearing and hub assembly (fig. 8-40) includes the following:

OUTER DRIVE AXLE- a stub axle shaft that extends through the wheel bearings and is splined to the hub.

WHEEL BEARINGS- either ball or roller type bearings that allow the drive axle to turn in the steering knuckle or bearing support.

STEERING KNUCKLE or BEARING SUPPORT- a suspension or steering com-ponent that holds the wheel bearings, axle stub, and hub.

DRIVE HUB- a mounting place for the wheel which transfers driving power from the stub axle to the wheel.

AXLE WASHER- a special washer that fits between the hub and locknut.

HUB or AXLE LOCKNUT- a special nut that screws onto the end of the drive axle stub shaft to secure the hub and other parts of the assembly.

GREASE SEAL- prevents lubricant loss between the inside of the axle and the steering knuckle and bearing support.

The driving wheel bearing and hub assembly has bearings mounted in a stationary steering knuckle or bearing support. The drive axle fits through the center of the bearings. The hub is splined to the axle shaft. Instead of a stationary spindle. the axle shaft spins inside the stationary support. With the hub splined to the axle shaft, power is transferred to the wheels.

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