Internal spur gears, unlike spur gears, have the teeth generated on the inner diameter of the blank. They are generally stronger and more efficient than the mating pinion gear. The pitch diameter of the internal gear must be at least 1.5 times the P.D. of the mating pinion. If this condition is not met, interferences between the tips of the teeth will occur.
Internal gears provide designers with the ability to achieve higher contact and drive ratios than standard spur gears at shorter center distances. They also enable a velocity change without a directional change, which would require an idler gear with standard spurs.
Internal Gear Manufacturing Options
- Pitch: 32 to 120 DP and 1.5 to .25 MOD
- Materials: Aluminum & stainless steel
- Number of Teeth: Up to 360
Use the filters below to narrow internal gear options by type, pitch, internal diameter, material, pitch diameter, and number of teeth. WM Berg also offers custom internal gears.