A wrapped composite dry sliding bearing is a type of bearing designed to operate without external lubrication, making it suitable for applications where maintenance is difficult or where contamination from lubricants is undesirable. These bearings are typically made from composite materials, which combine different components to achieve specific performance characteristics such as low friction, high wear resistance, and durability.
Key Features of Wrapped Composite Dry Sliding Bearings:
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Self-Lubricating: The composite material often includes solid lubricants (e.g., PTFE, graphite, or molybdenum disulfide) embedded in the matrix, reducing friction and wear.
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Low Maintenance: Since they operate without external lubrication, they require minimal maintenance.
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High Load Capacity: The composite structure can handle high radial and axial loads.
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Corrosion Resistance: Many composite materials are resistant to corrosion, making them suitable for harsh environments.
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Lightweight: Composite materials are often lighter than traditional metal bearings.
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Noise Reduction: These bearings typically operate quietly due to the self-lubricating properties and damping characteristics of the composite material.
Construction:
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Backing Layer: Usually made of steel or another strong material to provide structural support.
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Composite Layer: The sliding surface is made of a composite material, often a polymer matrix reinforced with fibers (e.g., carbon, glass) and solid lubricants.
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Wrapped Design: The composite layer is wrapped around the backing layer, ensuring a strong bond and uniform distribution of the material.
Applications:
Wrapped composite dry sliding bearings are used in a variety of industries, including:
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Automotive: Suspension systems, steering components, and chassis.
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Aerospace: Control surfaces, landing gear, and other moving parts.
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Industrial Machinery: Conveyors, pumps, and hydraulic systems.
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Marine: Ship rudders, propellers, and other components exposed to water.
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Construction: Heavy equipment and machinery operating in harsh conditions.
Advantages:
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Reduced friction and wear.
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Extended service life.
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Suitable for high-load and high-speed applications.
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Operates in extreme temperatures and environments.
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Eliminates the need for external lubrication.
Disadvantages:
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Higher initial cost compared to traditional bearings.
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Limited availability of materials for specific applications.
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May not be suitable for extremely high-temperature environments beyond the material’s limits.
If you have a specific application or need more detailed information, feel free to ask!
The PTFE bushing you described is a high-performance, lead-free, self-lubricating bearing solution designed for a wide range of applications. It combines the benefits of PTFE (polytetrafluoroethylene) with a robust layered structure to provide excellent wear resistance, low friction, and maintenance-free operation. Below is a detailed breakdown of the technical details and features:
Technical Details
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Specific Load Capacity:
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Static: ≤ 250 [N/mm²]
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Dynamic: ≤ 140 [N/mm²] (at slow sliding speeds)
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Sliding Speed:
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Dry: ≤ 2.0 [m/s]
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Oil-lubricated: ≤ 5.0 [m/s]
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Friction Coefficient (µ):
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Dry: 0.02 to 0.20
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Oil-lubricated: ≤ 0.05
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Temperature Range:
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-195°C to +280°C
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Max. PV-Value:
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Dry: 3.8 [N/mm² x m/s]
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Oil-lubricated: ≤ 60 [N/mm² x m/s]
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Construction
The PTFE bushing is a multi-layer bearing with the following structure:
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Backing Layer:
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Made of tin- or copper-coated steel for strength and durability.
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Middle Layer:
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Sintered bronze for enhanced load-bearing capacity and thermal conductivity.
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Sliding Surface:
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PTFE (lead-free) for low friction, self-lubrication, and excellent wear resistance.
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Key Features
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Self-Lubricating:
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The PTFE layer provides inherent lubrication, eliminating the need for external lubrication.
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Maintenance-Free:
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Ideal for applications where regular maintenance is difficult or impossible.
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Low Coefficient of Friction:
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Ensures smooth operation and reduces energy consumption.
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Wide Temperature Range:
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Can operate in extreme temperatures, from cryogenic conditions (-195°C) to high temperatures (280°C).
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High Load Capacity:
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Suitable for both static and dynamic loads, even at slow sliding speeds.
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Corrosion Resistance:
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The PTFE layer and optional stainless steel backing provide excellent resistance to corrosion and chemicals.
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Applications
PTFE bushings are used in a variety of industries and applications, including:
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Automotive: Suspension systems, steering components, and chassis.
- Industrial Machinery: Conveyors, pumps, and hydraulic systems.
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Marine: Ship rudders, propellers, and other components exposed to water.
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Food and Beverage: Equipment requiring lead-free and corrosion-resistant materials.
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Medical Devices: Precision equipment requiring low friction and cleanliness.
Customization Options
The manufacturer offers a range of customization options to meet specific requirements:
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Custom Sizes:
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Bearings can be manufactured to exact dimensions, including inch sizes and special lengths.
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Special PTFE Layers:
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Different PTFE formulations for specific applications (e.g., higher wear resistance, lower friction).
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Backing Materials:
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Options include bronze, stainless steel, or other materials for specific environmental or load requirements.
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Split-Type Bushings:
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Easy to install and replace, with a long lifespan.
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Special Designs:
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Bearings can be produced according to customer drawings or specifications.
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Advantages
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Lead-Free: Compliant with environmental and safety regulations.
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Cost-Effective: Simple design and long lifespan reduce overall costs.
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Easy Installation: Split-type bushings simplify assembly and replacement.
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Versatile: Suitable for a wide range of applications and environments.
Disadvantages
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Limited High-Speed Performance: Dry sliding speeds are limited to 2.0 m/s (higher speeds require oil lubrication).
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PV-Value Limitation: Dry operation has a lower PV-value compared to oil-lubricated operation.
If you need further details, such as specific material options, performance data, or pricing, feel free to ask!
Special PTFE Bushing are available on request
Dry sliding bearing with a PTFE sliding layer.
This maintenance-free material features a PTFE sliding layer that provides excellent sliding and wear performance, high load capacity, and versatility. Available shapes include plain cylindrical bearings, flanged bearings, thrust washers, and sliding plates.
