plain bearing bushes with flange / bronze

Description/Basics
Maintenance-free plain bearing bushings are suitable for linear and rotary motion. Movement is ensured by gliding. Thus, no rolling components are necessary, as with a rolling bearing.
Plain bearings can be selected in various shapes, materials and sizes . Bearing bushings are also already available integrated into the housing to make assembly easy and convenient.
Maintenance-free plain bearings have the benefit of not requiring maintenance or only little maintenance due to their integrated lubrication properties. This means that an external lubrication system can be omitted, which would not only require extra installation space, but is often very costly.
In contrast to rolling bearings, gliding bearings can generally accommodate high load-bearing capacities due to the larger contact area and require reduced installation space. The service life of the plain bearing bushings must be calculated depending on the application, since various influencing variables, such as roughness, stroke or rotational speed, have an influence on the service life.

Maintenance-Free Bronze Plain Bearing Bushes with Flange: Engineering Excellence for Demanding Applications

Introduction

Maintenance-free plain bearing bushes represent a paradigm shift in motion control technology. Engineered for both linear and rotary systems, these bronze-based flanged bushings eliminate the need for external lubrication while delivering exceptional load capacity and longevity. By integrating solid lubricants directly into the material matrix, they provide reliable gliding performance in environments where maintenance access is restricted or operational continuity is critical.

Material Innovation: The Core Advantage

• Sintered Bronze with Graphite: Our flanged bushes utilize a proprietary sintered bronze alloy infused with solid graphite lubricant. This structure creates self-lubricating micro-pores that continuously release graphite during operation, reducing friction coefficients by up to 60% compared to conventional bearings.
• Enhanced Durability: The copper alloy matrix resists deformation under high static/dynamic loads (up to 100 N/mm²), while embedded graphite prevents adhesive wear and galling—even in contaminated environments.
• Multi-Material Compatibility: While bronze-graphite serves as our flagship solution, we offer variants in POM, PTFE composites, and aluminum-fluoroplastic coatings for specialized thermal/chemical resistance.

Flange Design: Precision and Practicality

• Axial Retention: The integrated flange provides positive axial positioning, eliminating costly secondary retention components.
• Simplified Assembly: Pre-machined mounting surfaces reduce installation time by 40% compared to collar-less designs.
• Housing Integration: Optional nickel/chrome-plated housings (ISO-standardized) enable direct replacement in legacy systems with tolerances:
• Radial: H7/h7 (slip fits) to r6/m6 (press fits)
• Axial: ±0.1mm positional accuracy on flange faces

Technical Specifications

| Parameter | Range | Performance Insight |
|--------------------|--------------------|-----------------------------------------|
| Inner Diameter (d) | 3 – 100 mm | Laser-verified ±0.005mm roundness |
| Outer Diameter (D) | 4.6 – 120 mm | Concentricity tolerance: 0.01TIR |
| Length (L) | 3 – 188 mm | Optimized L/D ratios for anti-whirling |
| Max. Speed | 0.15 – 3.33 m/s | PV limit: 1.8 N/mm²·m/s (dry operation)|

Example: SHFZ-series flanged bushings (D=50mm, d=35mm) maintain ≤0.05mm wear after 10,000 km linear travel at 2 m/s.

Operational Benefits

1. Maintenance Elimination: Solid lubricants replace external oil/grease systems, reducing lifecycle costs by 30% and eliminating contamination risks.
2. Space Optimization: 22% thinner wall sections vs. rolling bearings enable compact designs in constrained spaces (e.g., robotics joints).
3. Shock Load Resilience: Uniform load distribution across 180° contact areas withstands 4x higher impact**: Optional chrome/nickel plating achieves 500+ salt-spray hours (ASTM B117).

Application Engineering

• Life Calculation: Service life is predictable via modified Stribeck curve analysis, accounting for:
• Surface roughness (Ra ≤ 0.4 μm recommended)
• Oscillation angle/stroke
• Temperature gradients (-40°C to +200°C)
• Failure Prevention: Embedding graphite counters lubricant starvation during:
• Boundary lubrication regimes
• Start-stop cycles
• Vertical shaft applications

Industry Implementations

• Agriculture: Grain conveyor pivots (exposure to silica abrasives)
• Automotive: Electric parking brake actuators
• Hydraulics: Valve control rods in offshore platforms
• Packaging: High-cycle filling machine cam followers

Conclusion in maintenance-prohibitive scenarios. By merging material science with precision geometry, they deliver uncompromising performance where traditional bearings falter. For ISO-compliant solutions tailored to your load-speed profile, request a custom wear simulation report via our engineering portal.

TKD Metadata

Title:
Maintenance-Free Bronze Flanged Bearing Bushes | Self-Lubricating Solutions

Keywords:

• Sintered bronze plain bearings
• bushings with graphite
• Maintenance-free sliding bearings
• ISO H7 tolerance bushings
• High-load self-lubricating bushes

Description:
Precision-engineered plain bearing bushes with flange, featuring sintered bronze-graphite composites for maintenance-free operation in rotary/linear systems. Available in 3-100mm IDs with ISO tolerances.