Internal Gears used in mechanisms such as planetary gear drive
Internal gear is a gear with its teeth cut in the internal surface of a cylinder and meshes with spur gears.
In its manufacturing, because of its shape, the usual hobbing machine used in spur gear production cannot be used. Generally it is made with gear shaper (or gear shaping machine) equipped with a pinion cutter. More recently, the efficiency of internal gear cutting has been improved by a different process called skiving.
Normally, internal gears can be used with the same module spur gears, depending on the number of teeth combinations, but it is necessary to note the possibilities of getting involute, trochoid or trimming interferences.
Internal gears are often used in applications involving planetary gear drives and gear couplings. There are three major types of planetary gear mechanisms: planetary, solar and star types. Depending on the type and the pattern of which shafts act as input and output, many variations of speed transmission ratios and rotational directions are produced.
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