Sintered Bearing
Sintered bearing is a kind of porous self-lubricating bearing manufactured by powder metallurgy technology, which can operate for a long time under the condition of no external oil supply or little oil.
- Product Introduction
Sintered bearings (also known as sintered oil containing bearings) are porous structural materials made by pressing metal or alloy powders (such as copper based and iron-based) and sintering them at high temperatures. They are then vacuum immersed in oil to store lubricating oil in the micropores. During the operation of the equipment, the rotation of the shaft neck generates thermal expansion and friction, which causes oil to seep out of the pores and form a lubricating film; After stopping operation, the oil is "sucked" into the pores again, achieving self-lubricating circulation.
This design is particularly suitable for maintenance difficulties, noise sensitivity, or situations that require long-term fuel free use, and is widely used in fields such as household appliances, power tools, and automotive parts .
product Parameter (specification)
| Main materials |
Copper based (tin bronze), iron-based, copper iron alloy |
| Manufacturing process | Powder pressing → High temperature sintering → Shaping → Vacuum oil immersion |
| Typical advantages | Self lubricating, low cost, maintenance free, low noise, suitable for mass production |
| Main disadvantages | High friction coefficient, unsuitable for high loads, and lower strength than solid metal bearings |
| Common applications | Household appliance motors, power tools, office equipment, automotive parts |
Core Composition and Working Principle
• Base material: Copper powder, iron powder, or their alloys are commonly used as the main raw materials to provide strength and wear resistance.
• Lubrication mechanism: It relies on the connected pores formed by sintering to store lubricating oil, which is automatically released and recovered during operation without the need for additional refueling.
• Solid lubricant optional addition: Some high-performance models may also mix solid lubricant powders such as MoS ₂ to enhance reliability under extreme working conditions.
Sintered bearings vs traditional bearings
| Dimension | Sintered bearing | Ball/roller bearings |
| Lubrication method | Self lubricating (with built-in oil) | Regularly add grease or lubricating oil |
| Maintenance requirements | Maintenance free or low maintenance | Regular maintenance is necessary |
| Cost | Low manufacturing cost, suitable for large quantities | Relatively high |
| Bearing capacity | Mainly for medium and low loads | Can withstand heavy loads |
| Noise level | Smooth operation and low noise | There may be rolling noise |
| Application scenarios | Small motors, fans, office equipment, etc | Industrial heavy machinery, high-precision transmission system |
Conclusion
Sintered bearings have become key components in modern light industry and consumer electronics due to their self-lubricating, low-cost, silent operation, and maintenance free characteristics. It is particularly suitable for small and medium-sized mechanical equipment that require high maintenance convenience and operational stability.
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