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Design of Internal Helical Gears - March/April 1989

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Archive > 1989 > March/April 1989 > Design of Internal Helical Gears

The article "Design of Internal Helical Gears" appeared in the March/April 1989 issue of Gear Technology.

Summary
In principal, the design of internal helical gear teeth is the same as that for external helical gears. Any of the basic rack forms used for external helical gears may be applied to internal helical gears. The internal gear drive, however, has several limitations; not only all those which apply to external gears, but also several others which are peculiar to internal gears. As with external gears, in order to secure effective tooth action, interferences must be avoided. The possible interferences on an internal gear drive are as follows: 1. Involute interference. To avoid this, all of the working profile of the internal tooth must be of involute form.

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