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An Internal Gear is a gear that has teeth pointing towards its center, as opposed to an external gear where the teeth point away from the center. The addendum and dedendum of an internal gear are in reverse positions compared to an external gear. The use of an internal gear with a standard spur pinion results in a small parallel shaft transmission drive with a large speed reduction. The center distance in internal gears is much smaller than that of two exterior gears with the same ratio. This makes internal gears an ideal choice where two parallel shafts need to rotate in the same direction, eliminating the need for an idler gear.

Internal gears have several advantages. One of these advantages is reduced sliding action as the working areas of the teeth of the gear and pinion are almost the same length when compared to an external gear with the same tooth ratio and size. This results in a reduction in relative slippage of the teeth, which is desirable as the sliding action of one tooth over another causes friction and, subsequently, tooth wear.

Internal gear drives can be operated with the apparatus in a fixed position and the pinion rotating along the pitch line or with the gear rotating freely and the pinion in a fixed position. However, interference may occur when mating pinions are too close in size to the gear. Therefore, the difference in teeth between the pinion and the gear should not be less than 15.

Internal gears are available in STEEL, STAINLESS STEEL, CAST IRON, BRONZE, Light weight aluminum, DELRIN and NON-METALLIC (planetary gearbox PHENOLIC). Ever-Power Group provides regular internal gears and can produce made-to-order internal gears to meet specific requirements.

Common Usage Scenarios

Internal gears are used in several applications where two parallel shafts need to rotate in the same direction. They are commonly used in machinery that requires speed reduction, such as conveyor belts, pumps, and mixers. Internal gears are also used in the automotive industry, textile industry, and in printing presses.

The Benefits of Internal Gears

When compared to external gears, internal gears offer several benefits. Internal gears have reduced sliding action, resulting in less friction and tooth wear. This makes them a more durable and long-lasting option. Additionally, the center distance of internal gears is much smaller than that of two exterior gears with the same ratio, making them an ideal choice where space is limited.

Materials Used in Internal Gears

Internal gears can be made from a variety of materials, including steel, stainless steel, cast iron, bronze, aluminum, and delrin. The material used depends on the application and specific requirements.

Installation, Maintenance, and Repair

Installation, maintenance, and repair of internal gears require expertise and specialized knowledge. It is important to follow the manufacturer’s guidelines when installing or repairing internal gears to ensure optimal performance and longevity. Routine maintenance, such as regular cleaning and lubrication, can prevent premature wear and damage.

Replacing Internal Gears

When replacing internal gears, it is important to choose the correct gear and ensure that it is properly installed. Care should be taken to ensure that the gear and pinion are not too close in size to avoid interference. Ever-Power Group can provide replacement internal gears that meet or exceed OEM specifications.

FAQs

1. What are internal gears used for?

Internal gears are used in machinery that requires speed reduction, such as conveyor belts, pumps, and mixers. They are also used in the automotive industry, textile industry, and in printing presses.

2. What materials are used in the manufacturing of internal gears?

Internal gears can be made from a variety of materials, including steel, stainless steel, cast iron, bronze, aluminum, and delrin.

3. What is the difference between internal and external gears?

Internal gears have teeth pointing towards the center, while external gears have teeth pointing away from the center. The addendum and dedendum of an internal gear are reversed compared to an external gear.

4. What are the advantages of using internal gears?

Internal gears have reduced sliding action, resulting in less friction and tooth wear. They are also more compact and offer a smaller center distance than external gears with the same ratio.

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