What is a Sintered Bush? A Simple Guide
If you’ve ever used a fan, a washing machine, a car, or a motor, chances are it had a small but very important part inside called a sintered bush. These tiny metal parts help machines move smoothly without making too much noise or needing constant oiling. In this blog, we’ll explain what a intered bush is, how it’s made, where it's used, and why it’s so useful.
What is a Sintered Bush?
A sintered bush is a type of bearing. Bearings are parts that help reduce friction between two moving surfaces, usually a shaft rotating inside a hole. The sintered bush does this job while also having something special: it holds oil inside itself. This oil helps keep everything moving smoothly without needing you to add oil from outside. That’s why we also call them self-lubricating bushes.
How is a Sintered Bush Made?
Sintered bushes are made using a process called powder metallurgy. This means they are made from tiny metal powders (like bronze or iron) instead of melting and pouring the metal into a mold. Here's a step-by-step explanation of how they are made:
- Metal Powder: First, special metal powders are selected. Bronze is one of the most common materials.
- Pressing the Powder: The powder is pressed in a die (a mold) to make the rough shape of the bush.
- Sintering: The shaped part is heated in a furnace. This process is called sintering. It bonds the metal particles together without melting them fully.
- Oil Filling: After sintering, the sintered bush has many tiny holes inside it—these are pores. These pores are filled with oil. The oil stays inside and comes out slowly when the bush is working.
This process creates a strong, oil-filled sintered bush that can work for a long time without maintenance.
Why Use a Sintered Bush?
- Self-Lubricating: They already have oil inside them, so you don’t need to add grease or oil again and again. This makes maintenance easier and cheaper.
- Smooth and Quiet: Because the bush keeps the shaft running smoothly, it reduces noise and vibration. This is important in home appliances like fans or washing machines.
- Saves Money: Making Sintered bushes from powder saves material and costs less, especially when making them in large numbers.
- Strong and Long-Lasting: They can take a lot of weight and keep working for a long time without wearing out quickly.
- Can Be Used in Many Shapes: The process allows making bushes in many sizes and shapes depending on the machine’s needs.
Where Are Sintered Bushes Used?
- Automobiles (Cars and Bikes): Used in engines, gear systems, and steering parts.
- Home Appliances: Found in fans, washing machines, mixers, grinders, and more.
- Electric Motors and Pumps: Help the motor spin quietly and without too much friction.
- Agriculture Equipment: Used in tractors and other farm machines where dust and heavy loads are common.
- Industrial Machines: Used in conveyors, drills, compressors, and more.
What Materials Are Used?
The most common material used in Sintered bushes is bronze, which is made from copper and tin. Some bushes are made from iron or other metals depending on the use. Bronze is popular because it doesn’t rust easily and lasts longer.
Features of Satkirti’s Sintered Bronze Bushes
- Made from High-Quality Bronze Powder: Composition: 89% Copper, 11% Tin
- Porous Structure: Allows oil to stay inside the bush and keep parts moving smoothly.
- Oil-Soaked: Self-lubricating and maintenance-free.
- Temperature Resistant: Can work in temperatures up to 200°C.
- Strong and Durable: Designed to handle high loads and long working hours.
- Available in Different Sizes: Made to fit different machines and needs.
Important Technical Details
| Property |
Typical Range / Info |
| Material |
Bronze (Cu 89%, Sn 11%) |
| Density |
4.5 to 6.5 g/cm³ |
| Porosity |
35% to 50% |
| Oil Content |
15% to 30% by volume |
| Operating Temp |
-40°C to +200°C |
| Load Capacity |
Up to 75 MPa |
| Friction Coefficient |
0.05 to 0.20 |
| Usage Life |
Long-lasting under regular use |
Choosing the Right Sintered Bush
- What Load It Will Carry: Choose a bush strong enough for the weight or force.
- How Fast It Will Spin: Some bushes work better at low speeds, while others can handle high speed.
- The Size You Need: Always choose the correct inner and outer diameters.
- Working Environment: If the machine works in hot, dusty, or wet areas, pick a bush that can handle it.
- Maintenance Needs: A Sintered bush will reduce the need for oiling and repairs.
Final Thoughts
A sintered bush may be a small part, but it plays a big role in keeping machines running smoothly, quietly, and for a long time. From home fans to car engines and big industrial machines, sintered bushes help everything work better without much fuss. Thanks to their self-lubricating feature, they are easy to use and take care of.
If you are looking for high-quality sintered bronze bushes that last long and perform well, Satkirti’s Sintered bushes are a smart and reliable choice. Whether you're in automotive, appliances, or industrial machinery, you can count on them to deliver excellent results.
