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2. Locking hubs - Wikipedia

   en.wikipedia.org/wiki/Locking_hubs

   This is done to reduce the mechanical resistance of the front-portion of the drivetrain when four-wheel drive is not in use. [1] The hub, along with the wheel, is designed to engage (lock) onto the axle, to be powered by the drivetrain in four-wheel drive; or the hub can disengage (unlock) from the axle when four-wheel drive is not needed, thus ...

3. Wheel hub assembly - Wikipedia

   en.wikipedia.org/wiki/Wheel_hub_assembly

   A roller bearing between the axle hub and axle shaft ensures easy rotation of the non-drive wheels. On the axle side, it is mounted to the holding bracket from the chassis; on the disc side, the wheel is mounted to the bolts of the WHA. When replacing, a wheel hub assembly should be torqued to the vehicle's specifications to prevent failure. [1]

4. Axle - Wikipedia

   en.wikipedia.org/wiki/Axle

   The overall assembly can carry more weight than a semi-floating or non-floating axle assembly because the hubs have two bearings riding on a fixed spindle. A full-floating axle can be identified by a protruding hub to which the axle shaft flange is bolted. The semi-floating axle setup is commonly used on half-ton and lighter 4×4 trucks in the ...

5. Steering knuckle - Wikipedia

   en.wikipedia.org/wiki/Steering_knuckle

   In a drive suspension, the knuckle has no spindle, but rather has a hub into which is affixed the bearings and shaft of the drive mechanism. The end of the drive mechanism would then have the necessary mounting studs for the wheel/tire and/or brake assembly. Therefore, the wheel assembly would rotate as the drive shaft (or half-shaft) dictates.

6. Wheel - Wikipedia

   en.wikipedia.org/wiki/Wheel

   The hub is the center of the wheel, and typically houses a bearing, and is where the spokes meet. A hubless wheel (also known as a rim-rider or centerless wheel) is a type of wheel with no center hub. More specifically, the hub is actually almost as big as the wheel itself. The axle is hollow, following the wheel at very close tolerances.

7. Trunnion - Wikipedia

   en.wikipedia.org/wiki/Trunnion

   In older cars, the trunnion is part of the suspension and either allows free movement of the rear wheel hub in relation to the chassis [10] or allows the front wheel hub to rotate with the steering. On many cars (such as those made by Triumph [ 11 ] ) the trunnion is machined from a brass or bronze casting and is prone to failure if not greased ...