Wrapped steel bushes, steel or tin-plated, steel bushes

PTFE-lined steel-backed bronze bushings, known for their self-lubricating features, are widely utilized across multiple sectors. These bushings are composed of a robust steel base for structural support, a sintered bronze intermediary for enhanced bond strength, and a PTFE coating that offers a maintenance-free operation surface. Renowned for their superior wear resistance, minimal friction, and ability to withstand high temperatures, these bushings are especially advantageous in corrosive settings. The PTFE layer ensures smooth, lubricated operations without the need for additional maintenance, whereas the bronze layer lends necessary support and durability, making these bushings perfect for applications that demand high load capacity and rapid operation speeds. Key industries benefiting from these bushings include automotive, aerospace, food processing, and chemical processing, among others.

PTFE lined self-lubricating steel-backed bushing also called PTFE bushing, dry bushing, slide bearing, Polytetrafluoroethylene bushing, PTFE coated bearing, SF-1 oilless bearing， PTFE liner metal-polymer composite bearing, and PTFE based plain bearing. This type of DU bush takes the PTFE layer as a sliding layer which makes products that can perform very well under dry conditions or oil conditions.

This bronze sinter layer is impregnated and overlaid with the filled PTFE bushing lining. The steel backing provides mechanical strength, while the bronze sinter layer provides a strong mechanical bond between the backing and the bushing lining. This construction promotes dimensional stability and improves thermal conductivity. These PTFE linings offer exceptionally low friction.

Wrapped bushings, also known as plain or sleeve bearings, are a type of bushing that is commonly used in industrial and automotive applications. They are typically made of a low-friction material, such as bronze, and are wrapped in a porous fabric or plastic liner to provide additional lubrication and reduce friction.

DU bushes, also known as DU bearings or DU bushings, are a type of wrapped bushing that is made with a steel or bronze backing, a porous sintered bronze layer, and a PTFE or thermoplastic polymer lining. They are designed to provide excellent wear resistance and low friction, making them ideal for high-load and low-speed applications.

Steel or tin-plated DU bushes are a type of DU bushing that has a steel or tin-plated backing. This provides additional strength and corrosion resistance, making them ideal for use in harsh environments.

Some of the benefits of steel or tin-plated DU bushes include:

1. Corrosion resistance: The steel or tin-plated backing provides excellent corrosion resistance, making them ideal for use in outdoor or wet environments.
2. High load capacity: DU bushes have a high load capacity and can handle heavy loads without excessive wear.
3. Low friction: DU bushes have a low coefficient of friction, which helps to reduce wear and extend the life of the bushing.
4. Self-lubricating: The PTFE or thermoplastic lining provides excellent self-lubrication, reducing the need for additional lubrication.

Overall, steel or tin-plated DU bushes are a high-quality, low-maintenance solution for applications that require excellent wear resistance and low friction.

Application of composite bushing
The composite bushing is a rolled composite bushing with a steel plate as the base, sintered spherical bronze powder in the middle and a mixture of PTFE and lead rolled on the surface. It has the characteristics of small friction coefficient, good wear resistance, corrosion resistance, and oil-free lubrication. The use of this product can reduce the cost, reduce the volume of machinery, avoid the phenomenon of gnawing shaft and reduce mechanical noise and other advantages. The product has been widely used in the sliding parts of various machines, such as printing machines, elevators, textile machinery, fitness equipment, hydraulic trucks, micro motors, solenoid valves, automobiles, motorcycles and household machinery.

BUSHING MATERIALS

• Support material Steel tin-plated
• Intermediate layer Sintered bronze
• Sliding layer PTFE

MATERIAL STRUCTURE

1. PTFE with Pb 0.01~0.03mm

2. Porous bronze 0.2~0.3mm

3. Bronze backing 0.7~2.3mm

BUSHING ADVANTAGES

Improved energy efficiency with the low friction performance of PTFE-enriched overlay;
Extended service life with a high wear-resistant bronze layer;
Zero maintenance as PTFE lined self-lubricating steel-backed bushing can operate dry without grease;
Greater reliability than bimetallic bearings by avoiding potential shaft/bearing seizure under boundary lubricated conditions and frequent stop/start operation;
Compact, lightweight designs with thin-wall bearing construction;
Reduced noise with no metal-to-metal contact between the bearing and the shaft;
Quick, simple assembly without expensive mounting tools.

TOLERANCE DETAILS

• Housing ØH7
• Bushing inner-Ø after mountingH9
• Shaft tolerancef7 or h8

AVAILABILITY

VIIPLUS PTFE COMPOSITE BUSHINGS ARE SUITABLE FOR APPLICATIONS WHERE A SLIDING MATERIAL WITH SELF-LUBRICATING PROPERTIES IS A PREREQUISITE. APPLICATION AREA EXAMPLES FOR THESE BUSHINGS ARE:

• Automotive
• Material Handling Equipment
• Home Appliances And Consumer Goods
• Textile Machinery
  

  TECHNICAL DATA

  Specific load capacity (static)	≤ 250 [ N/mm² ]
  Specific load capacity (dynamic)	≤ 140 N/mm² at low speeds
  Specific load capacity(rotating oscillating)	≤60N/m㎡
  Friction value	0.03 to 0.25 µ
  Temperature	-200 to +280 [ °C ]
  Max. dry running Pv (Short-term operation)	3.6N/m㎡﹡m/s
  Max. dry running Pv (Continuous operation)	1.8N/m㎡﹡m/s
  Max. speed (dry running)	2m/s
  Max. speed (Hydrodynamic operation)	＞2m/s

  WHAT SHOULD BE PAID ATTENTION TO WHEN USING STEEL-BACKED BUSHING

  Steel-backed bushing belongs to the fine arts, so in the use of the complex bearing begged to be very cautious attitude, that is, the use of high-performance bearing, assuming improper use, can not reach the expected performance effect, and easy to make the steel-backed bushing damage. Therefore, the use of steel-backed bushing should pay attention to the following:

  1. adhere to the steel-backed bushing and its surrounding environment clean

  Even if invisible to the naked eye dust enters the steel-backed bushing, it will increase the wear, vibration, and noise of the steel-backed bushing.

  

  2. Be careful when using the device

  Strong stamping is not allowed, direct hammering on the steel-backed bushing is not allowed, the dry bearing is not allowed to pass through the rolling body pressure transfer.

  3. Use appropriate and accurate equipment and tools

  Use special tools whenever possible, and try to prevent the use of cloth and short fibers, and the like.

  4. Avoid steel-backed bushing corrosion

  When taking the steel-backed bushing directly by hand, wash the sweat from the hands and apply high-quality mineral oil before stopping the operation. In the rainy season and summer, pay special attention to rust prevention.

  However, under certain special operating conditions, the steel-backed bushing can achieve a better life than the conventional calculation, especially under light loads.These special operating conditions are the appearance damage that may occur when the rolling surfaces (tracks and rolling elements) are effectively separated and restricted by a smooth oil film. In fact, under ideal conditions, the so-called permanent bearing life is possible.