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Identifying the adjusting nut
system
One of the big advantages
of tapered roller bearings is that they can be adjusted to suit the
requirements of the particular application. Three typical setting
devices or nut systems are illustrated at right.
| Figure 1
shows a common nut system, which consists of a slotted hex nut
and a cotter pin on a threaded shaft. This is the single-nut
system. This simple and inexpensive method is commonly found
on wheel-bearing applications. |
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| Figure 2
uses two standard lock nuts and a tongued washer. Final
locking is done by bending a tang of the tongued washer over
the flat of both the jam nut and the adjusting nut. |
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| Figure 3
consists of a jam nut, washer and a special surface-hardened
adjusting nut with a protruding dowel. The dowel mates with
the tongued washer, which has closely spaced holes to position
and lock the inner nut against rotation. If necessary, flip
the spindle washer over to get a better alignment between the
adjusting nut dowel pin and the holes in the washer. This
system will provide a smaller increment of adjustment than the
slotted hex nut. |
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