Bearing Loads on the Front Axle Figure 27.6 illustrates the forces and the reactions on steering knuckle when the vehicle is at rest. The thrust load and the knuckle-pin-bearing load can be expressed in terms of the reaction of wheel on wheel spindle. Let, Rw = The reaction of the wheel on the spindle acting vertically through the centre of contact of tyre on ground. Rt = The load on the thrust bearing Ru = The load on the upper knucklepin bearing Rl = The load on lower knucklepin 'B' and 'C represent the centres of lower and upper knuckle-pin bearings respectively. 'A' is a point on the spindle axis in the centre plane of the wheel. Fig. 27.6. Forces and reaction on steering knuckle. The other loads acting on knuckle-pin bearing are those due to the rolling resistance and road shocks. These loads are proportional to the static load and hence can be accounted for.
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