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66
bevel gears except for the differences brought about by the spiral-shaped
teeth.
The Zerol bevel gear is a patented gear having curved teeth but with a
zero spiral angle. The axial thrust loads permissible for Zerol bevel gears are
not as large as those for the spiral bevel gear, and so they are often used
instead of straight bevel gears. The Zerol bevel gear is generated using the
same tool as for regular spiral bevel gears. For design purposes, use the same
procedure as for straight bevel gears and then simply substitute a Zerol bevel
gear.
It is frequently desirable, as in the case of automotive differential
applications, to have gearing similar to bevel gears but with the shafts offset.
Such gears are called hypoid gears, because their pitch surfaces are
hyperboloids of revolution. The tooth action between such gears is a
combination of rolling and sliding along a straight line and has much in
Figure IV-1
Spiral bevel gears.
(Courtesy of Gleason
Works, Rochester, N.Y.)
Figure IV-2
Cutting spiral-gear
teeth on the basic
crown rack.
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