Internal Gears

Internal gear is certainly a gear with its teeth cut in the internal surface area of a cylinder and meshes with spur gears.

In its manufacturing, because of its shape, the most common hobbing machine found in spur gear production can’t be used. Generally it really is made with gear shaper (or equipment shaping machine) equipped with a pinion cutter. Recently, the efficiency of internal gear cutting offers been improved by a different process called skiving.

Because of the thinness of the ring, it is sometimes difficult to produce high precision. On the other hand, gear grinding to improve precision grade is bound by the amount of manufacturers and their obtainable grinding facilities leading to very high cost.

Also, although it is generally too expensive to make helical teeth internal gears, Ever-Power has managed to get possible to produce them by adopting equipment that can cut them by simply making pinion cutters rather than needing helical guides.

Normally, internal gears can be used with the same module spur gears, depending on the number of teeth combinations, but it is necessary to notice the possibilities to getting involute, trochoid or trimming interferences. For using Ever-Power standard share gears, please consult the PDF formatted “Technical Info of Internal Gears” section for usable number of teeth combinations.

Internal gears are often used in applications involving planetary gear drives and gear couplings. There are three main types of planetary gear mechanisms: planetary, solar and star types. With respect to the type and the pattern of which shafts act as input and output, many variations of speed transmitting ratios and rotational directions are created.


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