English
Metal bushing is a common mechanical accessory installed in the hole of mechanical parts to bear the motion load of shaft parts, reduce friction, reduce vibration and noise, and extend the service life of equipment. It is usually located between the rotating shaft and the body, playing the role of bearing and liner. According to different use environments and equipment requirements, metal bushings can be made of brass, stainless Steel, cast iron, bronze, aluminum alloy and other Materials.
During the operation of the machine, the metal bushing can buffer the direct contact between moving parts in static or dynamic state, reduce wear and improve operation stability. It is suitable for various engineering equipment, automobiles, agricultural machinery, industrial machinery, wind power, mining equipment and other fields.
Application:
Automotive industry
Used in suspension systems, steering mechanisms, gearboxes, braking systems, etc. It plays a role in reducing metal friction and supporting shafts. Such as engine connecting rod bushings, chassis bushings, etc.
Industrial machinery and equipment
Such as injection molding machines, machine tools, conveyors, hydraulic equipment, etc. In these equipment, metal bushings are used to connect sliding or rotating parts to extend the service life of the equipment.
Agricultural machinery
Installed in harvesters, seeders, tractors and other equipment to withstand mud and sand impact and high-load operation scenarios to prevent shaft wear.
Engineering and mining machinery
Used in heavy-load occasions such as excavators, loaders, and lifting equipment, metal bushings must have extremely high impact resistance and pressure bearing capacity.
Wind power generation and aviation fields
Used in main shafts, variable pitch mechanisms, power systems, etc., requiring high reliability and stability, usually using high-precision bushings made of bronze or alloy steel.
Material:
Brass bushing: hardness HB80-100, friction coefficient 0.08, applicable temperature -40℃ to +200℃
Bronze bushing: compressive strength up to 250MPa, hardness HB90-110, suitable for high-speed operation
Stainless steel bushing: strong corrosion resistance, suitable for food machinery and chemical equipment
Bimetallic bushing (steel back + copper layer): compressive resistance 300MPa, suitable for high-load heavy machinery
Powder metallurgy bushing: strong oil content, suitable for small motors and household appliances
Features:
High-strength support: metal bushings can withstand high radial loads and axial forces, and the structure is strong and durable. It can still maintain stable operation under high pressure, high speed or heavy load conditions. According to different alloy formulas, its load-bearing capacity can reach more than 200MPa.
Excellent wear resistance: metal materials can be significantly improved by special treatment (such as tinning, sintering, carburizing or heat treatment) to improve wear resistance. For example, the wear rate of tin bronze bushings can be reduced to below 0.01mm/h in high-speed operation, extending the service life.
Good heat dissipation capacity: The thermal conductivity of metals is much higher than that of non-metallic bushings, and the heat conduction efficiency is high. It helps to quickly dissipate heat in high-speed operation or high-temperature environments, and reduce thermal expansion deformation caused by high temperature.
High-precision processing: Metal bushings can be precisely processed by CNC lathes, grinding, inner hole boring and other processes, and the matching accuracy can reach ±0.01mm, ensuring close fit with the axis and smooth operation.
Strong maintainability: Metal bushings are replaceable parts. After wear, only the bushing needs to be replaced instead of the entire shaft or body structure, which helps to save maintenance costs and improve equipment maintenance efficiency.
Diverse structural forms: Metal bushings can be designed into different structures such as flange type, seamless cylindrical type, open type, self-lubricating type, etc. according to actual needs to meet different assembly requirements.
Advantages:
Long service life: Under normal lubrication conditions, the service life of metal bushings can reach more than 5,000 hours, and the service life of some high-strength alloy products can be extended to 10,000 hours, which is much better than plastic or composite bushings.
Reasonable cost control: Compared with high-precision components such as rolling bearings, metal bushings have lower manufacturing costs and are suitable for large-scale machinery manufacturing Industries. They are easy to maintain and have low replacement costs in the later stage.
Adapt to high temperature and high pressure environments: Metal bushings are widely used in environments from -40℃ to +300℃, and can still maintain stable operation under high pressure conditions above 20MPa. Especially for steel-backed copper-lined products, the thermal deformation rate is less than 0.003%.
Good lubricity: Some metal bushings have self-lubricating designs or surface groove oil storage designs, which can reduce lubricating oil consumption and maintain the sliding properties between the shaft and the bushing, effectively reducing the wear coefficient to below 0.05.
Strong versatility and wide compatibility: Metal bushings are widely compatible with a variety of equipment and industry standards, suitable for standard apertures, tolerances, and shaft size designs, which are conducive to rapid replacement and universalization of complete machine accessories.
FAQ:
What is the difference between metal bushings and bearings?
Metal bushings are a form of sliding bearings that do not contain rolling elements. Bearings usually contain balls or rollers for rolling motion; while bushings mainly bear sliding friction, have a simpler structure, lower cost, and are suitable for low-speed and high-load occasions.
Do metal bushings need lubrication when used?
Most metal bushings require lubricating oil or grease to reduce friction and wear, but some self-lubricating metal bushings (such as graphite and oil groove designs) can work without oil for a short time.
How long is the life of a metal bushing?
Under standard working conditions, the life of an ordinary brass bushing is about 3,000 to 5,000 hours, and that of a bronze or bimetallic bushing can reach 8,000 to 10,000 hours. The specific life depends on the use environment and lubrication conditions.
Will metal bushings rust?
Ordinary carbon steel or untreated metal is prone to rust in a humid environment. However, stainless steel, bronze or materials with surface treatment such as electroplating and coating can effectively prevent corrosion.
Can metal bushings be customized?
Yes. Metal bushings can be customized according to shaft diameter, outer diameter, length, tolerance requirements, load conditions, and speed range. Manufacturers usually support customized services based on drawings and samples.
