Types of Front Hub Assembly



Types of Front Hub Assembly


The stub axle construction depends on whether it is a driving or non-driving hub.


Non-driving Hub
Figure 27.4A illustrates a typical bearing arrangement for a non-driving hub. This consists of a stub-axle, an externally cylindrical sleeve hub, a pair of taper-roller bearings, a grease-seal, a castellated adjustment nut and split-pin, a washer, and a dust-cap (Fig. 27.7).


A centrally flanged cylindrical sleeve hub is fitted over small outer and large inner taper-roller bearings, which are supported on the stub axle. The hub is made of malleable iron or steel cast. The bearings are designed to absorb both radial and axial loads when assembled. The slackness between the taper rollers and the inner and outer races are taken up by spinning the hub assembly while at the same time tightening the adjustment nut until all the free lay has been taken up. The bearings are then preloaded by tightening the nut with a torque wrench to some predetermined torque setting. The nut is then slackened slightly until one of the slots in the nut aligns with the hole in the stub-axle. The split pin is then inserted through and bent over to secure the nut in position.





fig.27.4. Front bearing-hub assembly. A. Taper roller type. B. Ball bearing type.


For more accurate setting, some manufactures recommend to tighten the adjusting nut to a specified torque before releasing the nut a given amount. This operation, however, should not be confused with preloading. As hub bearing withstands heat from the brakes, a running clearance is provided, which is quite different to that obtained after a bearing has been preloaded. The flanged hub supports the road wheels and a brake drum or a brake disc. A dust cap with a central vent hole is used to enclose the end of the hub. This area of the hub sliouid not be filled with grease.



An alternative bearing arrangement is presented in Fig. 27.4B, which uses two angular contact type ball races held apart by a rigid spacer. The nut on this non-adjustable hub are tightened fully to the correct torque value.
Driving Hub
Figure 27.5 illustrates a typical hub arrangement used for a front-wheel drive car. The stub axle housing uses two bearings, which support both the wheel hub and driving shaft. The type of bearing used is decided based on the load carrying capacity of the road wheel.


Fig. 27.5. Front hub with front-wheel drive.

Comments

  1. miawriDecember 5, 2022 at 12:31 PM

    Hi There,
    Thank you for sharing the knowledgeable blog with us I hope that you will post many more blog with us:-
    A Side Wheel Hub Bearings is a type of automobile roller bearing that helps to support the weight of the vehicle and provide smooth rotation of the wheels.
    Email:info@australianonlinecarspartstoolsaccessories.com
    Click here for more information:- more info

    ReplyDelete

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