Internal Gears

Internal gear is usually 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 usual hobbing machine used in spur gear production can’t be used. Generally it really is made out of gear shaper (or gear shaping machine) equipped with a pinion cutter. Recently, the efficiency of inner gear cutting offers been improved by a different process called skiving.

Because of the thinness of the band, it really is sometimes difficult to produce high precision. On the other hand, gear grinding to improve precision grade is limited by the number of producers and their available grinding facilities leading to very high cost.

Also, although it is normally too expensive to make helical teeth internal gears, Ever-Power has made it possible to create them by adopting equipment that may cut them simply by making pinion cutters and not needing helical guides.

Normally, internal gears can be utilized with the same module spur gears, based on the amount 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 “Specialized Information 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 equipment mechanisms: planetary, solar and superstar types. According to the type and the design of which shafts become input and output, many variations of swiftness transmission ratios and rotational directions are produced.


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