Internal gear is definitely a gear using its teeth cut in the inner surface area of a cylinder and meshes with spur gears.

In its manufacturing, due to its shape, the most common hobbing machine found in spur gear production cannot be used. Generally it really is made with gear shaper (or gear shaping machine) built with a pinion cutter. More recently, the efficiency of inner gear cutting has been improved by a different process called skiving.

Because of the thinness of the band, it is sometimes difficult to produce high precision. However, gear grinding to improve precision grade is limited by the amount of manufacturers and their offered grinding facilities resulting in very high cost.

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

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

Internal gears tend to be used in applications involving planetary gear drives and gear couplings. There are three major types of planetary equipment mechanisms: planetary, solar and star types. According to the type and the pattern of which shafts act as input and result, many variations of swiftness tranny ratios and rotational directions are created.