bearing pin and bush are case-hardened to allow articulation under high
pressures, and to contend with the load carrying pressure and gearing
action imparted via the chain rollers.
is, for each strength of conveyor chain, a range of pitches; the minimum
pitch being governed by the need for adequate wheel tooth strength; the
maximum pitch being normally dictated by plate and general chain rigidity.
precision conveyor chain, like transmission chain, consists of a series of
journal bearings held in precise relationship to each other by
constraining link plates.
bearing consists of a bearing pin and bush on which the chain roller
revolves. When required, the normal maximum pitch can be exceeded by the
use of strengthening bushes between the link plates, and suitable gaps to
clear the bushes must be provided in the wheel teeth.
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