Impregnated Bronze Bushing
Impregnated bronze bushing is a sliding bearing component made of bronze as the substrate through impregnation process (usually impregnating solid lubricants such as graphite, molybdenum disulfide, etc.). It has the characteristics of self-lubricating, wear-resistant, and strong load-bearing capacity, and is widely used in fields such as machinery, automobiles, and engineering machinery.
- Product Introduction
Structure and characteristics
• Base material: usually tin bronze (such as ZCuSn6Zn6Pb3) or lead bronze, with good thermal conductivity and mechanical strength.
• Lubricant impregnation: Solid lubricants (such as graphite and MoS ₂) are adsorbed onto porous bronze sintered bodies to form self-lubricating structures and reduce friction and wear..
• Features:
① Oil free or low oil lubrication, suitable for situations that are not easy to maintain;
② Wear resistant, corrosion-resistant, with a wide working temperature range (-200 ℃~+300 ℃);
③ Can withstand high impact loads and static loads.
Main application scenarios
• Construction machinery: Joint bearings and pin bushings for excavators and cranes;
• Automotive industry: engine camshaft bushings, chassis suspension system components;
• Machine tool equipment: guide rail slider, spindle bearing liner;
• Water conservancy and hydropower: gate opening and closing machine, turbine bearings;
• Textile machinery: sliding bearings for high-speed running components.
Common specifications and installation precautions
• Specification: The inner diameter range is generally 5mm~200mm, and the length can be customized according to the needs. Common forms include straight sleeve, flange sleeve, flanged sleeve, etc.
• Installation points:
① Interference fit installation to avoid relative sliding between the liner and the seat hole;
② Before installation, it is necessary to clean the oil stains and impurities inside the seat hole to ensure a tight fit;
③ Avoid deformation of the lining or detachment of lubricant during installation.
Comparison with traditional metal bushings
| Performance metrics | Impregnated bronze bushing | Traditional metal bushing |
| Lubrication method | Self lubricating (long-lasting) | Dependent on external lubrication (grease/oil) |
| Coefficient of friction | 0.05~0.15 | 0.1~0.3 (without lubrication) |
| Maintenance cycle | Long (no need for frequent refueling) | Short (requires regular lubrication) |
| Applicable speed | Medium low speed (≤ 5m/s) | Medium to high speed (requires forced lubrication) |
| Cost | Higher | Lower |
Selection suggestions
• Priority selection of scenarios: low-speed overload, difficult to maintain, dust/humid environment;
• Alternative solution: Composite bearings (such as PTFE coated bushings) can be considered for high-speed and light load applications, and ceramic based bushings can be used for extreme high temperature environments.
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