Shaft design

When bearings are mounted on shafts, locating method should be carefully determined. Shaft design examples for cylindrical bore bearings are given in "Table 14-4 Mounting designs for cylindrical bore bearings", and those for bearings with a tapered bore in "Table 14-5 Mounting designs for bearings with tapered bore".

Table 14-4 Mounting designs for cylindrical bore bearings

(a) Shaft locknut

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Lockwashers are used to prevent loosening of locknuts. When tapered roller bearings or angular contact ball bearings are transition-fitted to shafts, plain washers several mm thick as shown above (at right) should be added and tightened with nut.

(b) End plate

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End of shaft should have bolt holes.

(c) Locating snap ring

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Used when the housing inside is limited, or to simplify shaft machining.

Table 14-5 Mounting designs for bearings with tapered bore

(d) Adapter assembly

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The simplest method for axial positioning is just to attach an adapter sleeve to the shaft and tighten the locknuts.
To prevent locknut loosening, lock-washer (not more than 180mm in shaft diameter) or lock plate (not less than 200mm in shaft diameter) are used.

(e) Withdrawal sleeve

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The locknut (above) or end plate (below) fixes the bearing with a withdrawal sleeve, which makes it easy to dismount the bearing.

(f) Shaft locknut

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The shaft is threaded in the same way as shown in Fig. (a). The bearing is located by tightening locknut.

(g) Split ring

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A split ring with threaded outside diameter is inserted into groove on the tapered shaft.
A key is often used to prevent the locknut and split ring from loosening.

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