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.

As it is seen from the precision class of JIS N9 of KHK’s SIR ring gears, due to the thinness of the ring, it is sometimes difficult to produce high precision. On the other hand, gear grinding to improve precision grade is limited by the number of manufacturers and their available grinding facilities leading to very high cost.

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