Stainless Steel Bushings Triple-layer Stainless steel bearing with PTFE-surface, Stainless Steel+Porous Bronze Powder+PTFE/Additives

Stainless Steel Bushings and PTFE Composite Bearings

Triple-Layer Stainless Steel Bearings with PTFE Surface Coating
These bearings are constructed using a stainless steel backing combined with porous bronze powder and a PTFE (Polytetrafluoroethylene) surface layer. The design is aimed at enhancing the performance and durability of the bearing in various demanding applications.

Material Stainless Backed Composite Bushings is made out of a stainless steel backing strip (AISI 316TI) covered with PTFE consisting of steel, bronze,3 layers. The PTFE layer on the sliding surface. The metal side of the ptfe is continuously soldered to the stainless steel backing. Stainless Backed Composite dry sliding bushings can be machined.

Dry bearings (oil-free self-lubricating bearings) : Composite bearings are made of a mixture of steel plate, sintered spherical bronze powder in the middle layer, rolled polytetrafluoroethylene [PTFE] and lead in the surface layer.It has a small friction coefficient, wear resistance and corrosion resistance.Oil-free self-lubrication and long service life, use it can reduce costs, reduce noise, prevent adhesion, slippery.It is widely used in the sliding parts of all kinds of machinery, such as printing machine, loom, hydraulic truck, tobacco machine, medical machinery, fitness equipment, micromotor, automobile, motorcycle, etc.

VIIPLUS Composite / Polymer Bushings are designed to operate under conditions which include (a) the need for maintenance and grease/lubricant-free operations; (b) low friction in the joint; (c) high to medium loads; (d) corrosive environment; and (e) the ability to absorb shock and vibrations.

VIIPLUS has a woven structure made of PTFE and epoxy resin, which provides tensile strength vastly superior to injection molded polymer bushings – and is significantly more resistant to high loads, seizure, and galling

These composite bushings are well-suited for rotation and oscillation applications and can be used at high speeds. In addition, these bushings are chemically inert and have low water absorption. Their maximum working temperature is 320°F (160°C). They are widely used for handling misalignment situations.

Lubrication

During a short run-in period, part of the run-in layer, the PTFE mixture, is transferred to the counter-material. During the run-in period of the PTFE bearing, the bearing surface usually takes on a gray/green color. The characteristic low friction and wear values are obtained at the end of the run-in period. Adding oil or other non-corrosive fluids can enhance the bearing’s performance.

PTFE composite bushing material

Viiplus PTFE composite plain bearings combine the mechanical strength of steel with the low friction of a PTFE-based self-lubricating lead-free sliding layer. The intermediate layer of porous tin bronze creates a strong bond between the backing and sliding surfaces and also improves the dissipation of heat generated during operation. To protect the bearings from corrosion, the steel backing is tin-plated. Except the sliding surface, PTFE composite dry sliding bearings can be machined. Calibration is possible within certain limits.

Characteristics

– Maintenance-free (self-lubricating)
– Low coefficient of friction
– Stainless steel (anti-corrosive)
– Approved according to RoHS Directive

Structure:

1. PTFE/Fibre mixture thickness 0.01~0.03mm. It is the contact surface for the rotating shaft. Minute partides of the PTFE layer and the sintered bronze material combine to create a solid lubricant film, which coats the shaft.

2. Sintered bronze powder thickness 0.20*0.35mm,A special composition of powdered copper is thermally fused to the steel backing. This contact layer acts as an anchor for the PTFE layer and conducts the thermal build-up away from the bearing surfaces.

3. Low-carbon steel backing. Setting the foundation of the bushings, the steel back provides exceptional stability, load carrying and heat dissipation characteristics.

PTFE Composite bushings Bering Design & Benefits

The structure of the bearings consists of a rigid steel or corrosion-resistant bronze backing, which provides mechanical strength, while a porous sintered bronze interlayer impregnated with a homogeneous mixture of PTFE and lead provides low friction and high wear resistance.

The low friction of the bearings reduces power losses for improved energy efficiency, while the wear-resistant bronze layer provides extended service life. Being self-lubricating, the bearings require little to no maintenance. However they can also be used with lubricant to prevent potential shaft/bearing seizure under boundary conditions.

The compact, lightweight design and thin-wall construction of the  bearings provide space and weight savings, and because there are no moving parts or metal-to-metal contact the bearings are quieter. In addition, assembly can be done quickly and easily without costly mounting tools.

PTFE composite bushings are the maintenance-free solution for heavy load/medium speed applications. Viiplus offers a wide range of both straight and flanged PTFE composite bushings. Advantages of these bushings include:

maintenance-free operation 
very good frictional properties 
high load carrying capacity 
high operating temperatures 
high sliding velocity 
small operating clearance

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

Design

• Plain cylindrical bearings
• flanged bearings
• thrust washers
• sliding plates

Technical information and standard dimensions on the datasheet