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67
common with that of worm gears. Figure IV-3 shows a pair of hypoid gears
in mesh.
Figure IV-4 is included to assist in the classification of spiral bevel
gearing. It is seen that the hypoid gear has a relatively small shaft offset. For
larger offsets, the pinion begins to resemble a tapered worm and the set is
then called spiroid gearing.
Straight Bevel Gears
When gears are used to transmit motion between intersecting shafts,
some form of bevel gear is required. A bevel gearset is shown in Fig. IV-5.
Although bevel gears are usually made for a shaft angle of 90°, they may be
produced for almost any angle. The teeth may be cast, milled, or generated.
Only the generated teeth may be classed as accurate.
Figure IV-3
Spiroid bevel gears.
(Courtesy of Gleason
Works, Rochester, N.Y.)
Figure IV-4
Comparison of intersecting-
and offset-shaft bevel-type
gearings. (By permission, from
Gear Handbook, McGraw-Hill,
New
York, 1962, p. 2-24.
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