615 Bearing loading

Bearings used to support transmission shafts are generally subjected to two kinds of loads:

1 A load (force) applied at right angles to the shaft and bearing axis. This produces an outward

Fig. 6.4 Illustration of radial and axial bearing loads

force which is known as a radial force. This kind of loading could be caused by pairs of meshing spur gears radially separating from each other when transmitting torque (Fig. 6.4). 2 A load (force) applied parallel to the shaft and bearing axis. This produces an end thrust which is known as an axial force. This kind of loading could be caused by pairs of meshing helical gears trying to move apart axially when transmitting torque (Fig. 6.4).

When both radial and axial loads are imposed on a ball bearing simultaneously they result in a single combination load within the bearing which acts across the ball as shown (Fig. 6.6).

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