How much do you know about plain bush bearings?

In the fields of industrial machinery and precision engineering, the importance of reliable components cannot be overstated. Plain bush bearings are essential and critical components that ensure smooth operation, reduce friction, and support rotating or sliding motion. As a leading manufacturer and supplier of plain bush bearings in China, TOP BEARINGS has established itself as a leading supplier of high-quality plain bush bearings and rolling bearings. Our products are used in over 30 industries, including automotive, construction machinery, metallurgy, and water conservancy.

Learning About Plain Bush Bearings

Plain bush bearings, also known as sleeve bearings or plain bearings, are simple mechanical components designed to achieve linear or rotary motion through sliding action. Unlike rolling bearings that use balls or rollers, plain bearings operate on a sliding surface and typically require lubrication. They are prized for their simple construction, high load capacity, durability, and quiet operation. TOP BEARINGS specializes in providing a wide range of plain bearings to meet diverse industrial needs. Our product line includes self-lubricating, boundary lubricated, bimetallic, and solid lubricated types, each designed to meet specific performance criteria.

Key Product Specifications

1. Self-Lubricating Bearings (Dry Bearings - DU Bushings)

Self-lubricating bearings are designed for minimal external lubrication and are ideal for maintenance-free or hard-to-reach applications. Our DU bushings feature a steel backing, a sintered porous bronze interlayer, and a PTFE-based overlay.

Key Specifications:

Material Composition: Steel backing + sintered bronze + PTFE/lead alloy

Operating Temperature Range: -200°C to +280°C

Maximum Load Capacity: Up to 100 N/mm² (static), 50 N/mm² (dynamic)

Sliding Speed: Up to 2.5 m/s (dry), up to 5 m/s (lubricated)

Coefficient of Friction: 0.03 - 0.20 (depending on load and speed)

2. Bimetallic Bearings (SY Bushings)

Bimetallic bearings consist of a steel backing for strength and a sintered copper alloy layer for excellent surface properties. They offer excellent load capacity and wear resistance and are commonly used in high-stress environments such as automotive engines. Key Parameters:

Material Composition: Steel backing + sintered CuSn8Pb15Ni2 alloy

Operating Temperature: Maximum 250°C

Maximum Load Capacity: Maximum 120 N/mm²

Lining Hardness: 60-90 HB

Recommended Surface Roughness: Ra ≤ 0.8 μm

3. Cast, Machined, and Wound Bronze Bearings (Wieland B-09, S-31 Materials)

These bearings are made of a high-grade bronze alloy with excellent machinability and corrosion resistance. They are suitable for medium loads and speeds and are available in cast, machined, or rolled (strip) forms. Key Parameters:

Material Standards: Wieland B-09 (CuSn8P), S-31 (CuZn31Si1)

Hardness: 70-120 HB (B-09), 90-150 HB (S-31)

Tensile Strength: Minimum 350 MPa (B-09), Minimum 500 MPa (S-31)

Maximum PV Value: 1.8 MPa*m/s (lubricated)

Density: 8.8 g/cm³ (B-09), 8.5 g/cm³ (S-31)