Heavy-Duty Plain Bearing Bushes for Industrial Machinery

Application Areas and Material Selection: CuSn12 vs. GZCuZn34Al2

1. Heavy-Duty Plain Bearings in Industrial Applications

Heavy-duty plain bearings (also known as sliding bearings or bearing bushes) play a critical role in industrial machinery operating under low-speed, high-load, and impact conditions. Unlike rolling bearings, plain bearings are designed to provide a controlled sliding interface, absorb shock loads, and protect expensive shafts or pins.

Typical forms include:

• Cylindrical bearing bushes (Lagerbuchse)

• Flat wear plates

• Flanged bushes

Although their geometries differ, the engineering principle remains the same:
load-bearing sliding contact with predictable wear behavior.

2. Material Overview: GZCuZn34Al2 (DIN 1709)

Material Specification

• Material: GZCuZn34Al2

• Material Number: 2.0596

• Standard: DIN 1709

• Material Type: Cast Aluminum Brass (High-strength copper alloy)

GZCuZn34Al2 is a high-strength, wear-resistant cast copper alloy, widely used for heavy-duty plain bearing applications where high surface pressure and shock loads are present.

3. Typical Application Areas (Engineering Perspective)

Installation Position

GZCuZn34Al2 bearing bushes are typically:

• Installed in pivot points or support bores

• Working together with steel shafts or hardened pins

• Operating under low speed, high load, and intermittent impact

Typical Equipment and Components

• Lifting and handling equipment

  • Kirow cranes

  • Port cranes

• Construction and industrial machinery

  • Stabilizer pivots

  • Swing arms

  • Support shafts

  • Rotating joints

These locations are critical structural points where reliability and wear control are essential.

4. Functional Role of the Bearing Bush

A heavy-duty plain bearing bush made from GZCuZn34Al2 serves as a sacrificial wear component, with the following core functions:

• Carrying high radial loads

• Providing a stable and controlled sliding interface

• Ensuring lubrication distribution through spiral or straight grease grooves

• Protecting the steel shaft by allowing the bush to wear first

• Enabling easy maintenance and replacement

In essence, it is a designed wear element that extends the service life of the overall machine.

5. Relationship to Wear Plates in Stabilizer Systems

In stabilizer systems such as those used on Kirow Scrap Pot Carriers, both wear plates and bearing bushes operate based on the same tribological principles.

The engineering logic is identical—only the geometry differs.

6. Material Selection Logic: CuSn12 vs. GZCuZn34Al2

Choosing the correct bearing material is crucial for performance and service life. Below is a practical comparison used by engineers in heavy-duty applications.

CuSn12 (Tin Bronze)

Key Characteristics

• Excellent sliding and anti-seizure properties

• Good conformability and embeddability

• Very stable friction behavior

Typical Applications

• Wear plates

• Plain bearing bushes under moderate shock

• Applications requiring smooth sliding and good lubrication retention

Best Choice When

• Sliding performance is critical

• Loads are high but relatively stable

• Shaft protection is a priority

GZCuZn34Al2 (Aluminum Brass)

Key Characteristics

• Higher mechanical strength than tin bronze

• Excellent resistance to surface pressure and shock loads

• Good wear resistance under boundary lubrication

Typical Applications

• Heavy-duty bearing bushes

• Pivot points with impact loads

• Large-diameter shafts and pins

Best Choice When

• Extremely high loads or shock loads are present

• Structural strength is a key requirement

• Operating speed is low

Practical Selection Guideline

7. Engineering Summary

The bearing bush is a heavy-duty plain bearing made of cast copper alloy GZCuZn34Al2, designed for low-speed, high-load sliding applications. Installed at pivot or support points of industrial machinery, it works in combination with steel shafts. Spiral lubrication grooves ensure effective grease distribution and reliable performance under severe operating conditions.