An Internal Gear could be described as the contrary of an external gear in that the teeth point towards rather than away from the center, and addendum and dedendum take invert positions. Internal Gears provide a compact parallel shaft transmission drive with large acceleration reduction. Used with a typical spur pinion the ratio is the same as that of two external gears, however the center distance is a lot smaller. Where it’s important to have two parallel shafts rotate in the same path, the inner gear eliminates the use of an idler gear.

Internal Gears possess many advantages when properly applied. One such advantage is reduced sliding actions. The corresponding working areas of the teeth of an internal equipment and pinion are more almost of the same length than may be the case with an exterior gear and pinion getting the same tooth ratio and tooth duration. Which means relative slippage of one’s teeth is less in the case of the internal. This point presents one of the advantages of using Internal Gears. The sliding action of one tooth over another causes friction; and because friction outcomes in tooth use, a reduction in the quantity of sliding action is desirable.

Internal Gear drives may be operated with the gear in a set position and the pinion rotating along the pitch line, or the apparatus may be absolve to rotate with the pinion rotating in a set position.

When mating pinions are as well close in proportions to the apparatus, interference may planetary gearbox result. For that reason, the difference in tooth of the pinion to the apparatus should not be less than 15.

RUSH GEARS inc. offers regular Internal Gears in Metal, STAINLESS STEEL, CAST IRON, BRONZE, Light weight aluminum, DELRIN and NON-METALLIC (PHENOLIC). We will gladly produce made to order Internal Gears to meet your needs.