1-732-972-5400 Mon - Fri 9:00a - 5:00p 100 Professional View Dr., Freehold, NJ 07728
1-732-972-5400 Mon - Fri 9:00a - 5:00p 100 Professional View Dr., Freehold, NJ 07728
Certified Plants
TS16949 & ISO9001
OEM services
TIER 1 & 2 manufacturer
Supply Chain Solutions
JIT delivery worldwide
Get A Quote

Internal vs External Spur Gears

 

Spur gears are the most common kind of gears, and are mainly used to transmit power and/or motion between parallel shafts. They can also be used to reduce or increase speed, multiply torque, and enhance accuracy enhancement for positioning systems.

Spur gears have straight-edged teeth that are cut parallel to the axis of rotation. These gears are mounted on parallel shafts to ensure that the teeth mesh together correctly. Spur gears mate only one tooth at a time, and the contact occurs instantaneously over the full face width of the mating teeth. This leads to loud operations along with high stress on the mating teeth.

Spur gears are of two kinds – external and internal. As the name suggests, external gears have teeth cut on the outside surface of the mating cylindrical wheels, and the teeth point away from the center. The input and output shafts move in opposite directions.

The teeth of an internal spur gear point inwards towards the center, and are cut on the internal surface of one of the mating cylindrical wheels. Both the input and output shafts rotate in the same direction — this eliminates the need for an idler gear. Since the centers of the mating wheels can be closer than those of external gears, internal spur gears are preferred in applications where space is a constraint. (However, these gears require complicated housing and support, since the external gear is contained within the internal gear.) Internal spur gears also make for a stronger drive, since there is more area contact and less sliding action than with similar external gears. Internal spur gears are an integral part of planetary gear drives and gear couplings.

AmTech International manufactures high quality external and internal spur gears of various sizes and dimensions, in high quality stainless steel and aluminum alloys, with custom manufacturing options to meet OEM customer needs.

Start Your Project

Precision manufacturing of gears, shafts, castings, forgings and other types of OEM products. Contact our sales team to get started today.


Recent Projects

Supercharger Shaft manufacturer
Drive Coupling manufacturer
Gear Hub manufacturer
Motorcycle Ring Gear
spline shaft manufacturing for hybrid vehicle
Miter shaft manufacturing
Rocker Arm Shaft - manufacturing services
Boron Steel shaft forging manufacturer
Steel Oxygen Sensor stamping manufacturer
Welded Shaft manufacturing services
Hot Forging motor shaft manufacturer
Output Motor Shaft machining project
1045 Steel shaft collar
Bevel Gear Shaft supplier
Involute Spline, Output Shaft manufacturing project
Output motor spline shaft supplier
shaft manufacturing project -knurled engine shaft product
aluminum support disc die casting
Bronze worm gear set