Introduction to Sintered Gears

Sintered gears, also known as powder metal gears, are manufactured using powder metallurgy processes. This involves compacting metal powders into a gear shape and then sintering them at high temperatures. This process creates strong, precise gears suitable for various industrial applications.Powder metallurgy sintered gears which involves the following key steps:

  1. Mixing metal powders with alloying elements and additives to create the desired composition.
  2. Compacting the powder mixture into the desired gear shape and size using high pressure.
  3. Sintering the compacted shape by heating it under controlled temperature and pressure, causing the metal particles to fuse together.

Common applications for sintered gears include

  • Automobiles
  • Power tools
  • Medical instruments
  • Domestic appliances
  • Outdoor power equipment
  • Marine equipment
  • Reduction gears
  • Transmission systems
  • Camshafts and crankshafts
  • Oil pump gears
Bevel gear
Bevel gear

Bevel gears are gears with intersecting axes and tapered tooth surfaces, usually used to change the direction of the rotating axis. Its design can achieve smooth and efficient power transmission and is widely used in automobiles, aviation, industrial machinery and other fields

Planetary internal gear
Planetary internal gears

A planetary gear is a gear system in which small planetary gears rotate around a central gear (sun gear) and mesh within an external ring gear (internal gear). This system provides efficient power transmission and a wide range of speed ratios and is commonly used in automatic transmissions, differentials, and industrial machinery.

Machinery gear
Garden machinery gears

Garden machinery gears are gear systems specifically used in various types of garden tools and equipment to ensure that the machines run smoothly and efficiently in various gardening operations.

Home appliance gears
Home appliance gears

Appliance gears are key components used in a variety of home appliances, responsible for transmitting power and adjusting movement. These gears are usually made using high-precision injection molding and metal processing to ensure their durability and reliability in daily use. Common applications include washing machines, blenders, and power tools. The efficient operation of appliance gears is the guarantee of stable performance and long life of home appliances.

Planetary gear reducer
Planetary gear reducer

A planetary gear reducer is a mechanical device that uses a planetary gear system to achieve speed reduction and torque amplification. Its structure consists of a sun gear, multiple planet gears, and an internal gear ring, offering advantages such as high efficiency, compactness, and high torque output. Planetary gear reducers are widely used in robotics, automation equipment, wind power generation, and industrial transmission systems.

Water pump valve gear
Water pump valve gear

Pump valve transmission devices are mechanical systems used to control the inlet and outlet valves of water pumps. Their functions include opening, closing and adjusting valves to control water flow and pressure. These devices are usually designed for various industrial and municipal water pump systems to ensure the efficient operation of water pumps and precise control of water flow to meet the needs of different applications.

9 Products Found.

Main materials used for sintered gears include

Sintered gears are typically made from powdered metal alloys that are carefully selected to meet specific performance requirements. The main materials used for sintered gears include:

  1. Iron-Based Alloys: Low-alloyed iron-based powders are commonly used, especially when superior material strength is required.
  2. Steel Alloys: Various steel alloys can be used, including sinter-hardened steels which provide high hardness directly after sintering without the need for additional heat treatment.
  3. Stainless Steel: Some sintered gears are made with a stainless steel base for corrosion resistance.
  4. Alloy Additives: Manufacturers can incorporate additives such as nickel, molybdenum, and chromium to alter and enhance the properties of the gear.

The choice of material depends on the specific application and desired properties of the gear. For example, automotive transmissions may require different alloy compositions compared to gears used in power tools or industrial machinery.

powder metallurgy factory
powder metallurgy factory

Sintered gears VS machined gears?

  1. Cost-effectiveness: Sintered gears are typically more economical to produce, especially for high-volume manufacturing, due to reduced material waste and fewer machining operations.
  2. Design flexibility: The powder metallurgy process allows for complex shapes and features to be created directly during compaction, enabling greater design freedom.
  3. Tight tolerances: Sintered gears can be produced with tight dimensional tolerances and consistency, often eliminating or reducing the need for additional machining.
  4. Material utilization: The powder metallurgy process has high material utilization, resulting in minimal waste compared to traditional machining methods.
  5. Environmental benefits: Sintered gear production is considered a “green” process due to its low energy usage and minimal scrap.
  6. Customizable material properties: The powder metallurgy process allows for tailoring of material composition to optimize performance for specific application.
  7. Improved surface finish: Sintered gears can achieve smooth surface finishes, especially when gear rolling is applied, potentially surpassing ground gears in some cases.
  8. Self-lubricating properties: Sintered gears can be impregnated with lubricants, enhancing their performance in certain applications.
  9. Weight reduction: In some cases, sintered gears can be designed to reduce overall weight compared to traditional gears.
  10. Sound dampening: The porous nature of sintered materials can contribute to reduced noise levels in gear operations.
  11. Suitability for mass production: Sintered gears offer excellent repeatability and consistency, making them ideal for high-volume manufacturing.


Sintered gears mainly include spur gears, helical gears, bevel gears, worm gears, internal gears, planetary gears, rack and pinion gears, etc. Spur gears and helical gears are used for parallel shaft transmission, bevel gears are used for intersecting shaft transmission, worm gears are suitable for large reduction ratios and high torque output, internal gears are often used in planetary gear systems, which have compact structures and high transmission efficiency, while rack and pinion gears convert rotational motion into linear motion.

JHMIM, a leading manufacturer of metal powders products, offers a range of mixes and alloys that can be optimized for each application, providing a balance between performance and cost. The powder metallurgy process allows for great flexibility in material selection and composition, enabling manufacturers to tailor the gear properties to specific requirements.

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