Spiral, Bevel, Hypoid

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MolaKule

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"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 bewteen gear has much in common with that of worm gears." Shigley and Mischke, Design of Mechanical Elements.

Hypoid Gears are of the subclass of Bevel and Spiral Gears. Now the main difference between worm gears and Hypoid Gears is that worm gears have teeth which mate on the outside surfaces tangentially, whereas Spiral gears such as hypoid spiral gears, mate on the gear face rather than the periphery.

The ring gear can mate to three different kinds of input drive gears:

1. Spiral Bevel in which the input drive pinion torque is inline with the horizontal axis of the ring gear at 3:00 O'clock,

2. Spiroid Bevel in which the input drive pinion torque is applied about 45 degrees CCW of the horizontal axis of the face of ring gear, at about 2:00 O'Clock,

3. Hypoid Bevel in which the input torqe is delivered by an input drive pinion gear at less than 45 degrees but greater than 5 degrees CCW above the horizontal axis of the ring gear, about 2:30 O'Clock.
 
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