Front axle (Wheel hub): Description and operation

Wheel hub

Section through wheel hub

1 Drive shaft 2 Axle casing 3 Gaiter 4 Upper ball joint 5 Constant velocity joint 6 Steering knuckle 7 Hub bearing 8 Hub flange

9 Wheel stud 10 Stake nut 11 ABS sensor ring 12 Tension collet 13 Lower ball joint 14 Securing bands 15 Shield 16 Oil seal

Each wheel hub consists of a hub flange pressed into a hub bearing.

The hub flange is splined to accept the constant velocity joint of the drive shaft, which is secured to the hub flange with a stake nut. Five studs are installed in the hub flange for the wheel nuts and a threaded hole is provided for the brake disc securing screw.

The outer race of the hub bearing is bolted to the steering knuckle. The hub bearing is a sealed unit which contains twin opposed roller bearings, pre-packed with grease during manufacture. A toothed ABS sensor ring is integrated into the inner race of the hub bearing. An opening in the outer race of the hub bearing accommodates the ABS sensor.