Spiral wheel (Chapter 5) is a gear, the teeth of which are located at an angle to the axis of rotation. It provides smoother, and therefore less noisy gearing of gear teeth. The disadvantage of spiral wheels is the occurrence in the process of mechanical moment, which is directed along the axis of rotation of the gear.
This requires the use of thrust bearings, as well as increased heat generation, as a consequence of increased friction surfaces of the teeth. Double spiral wheels (see "Double Helical Gears") are devoid of these problems.
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