Split composite sliding bearing
Split bushing sleeve Cylindrical Bushes,china Factory Direct Price
Note: Because of the lead content, PTFE Composite lead free type used in contact with food, beverage or products. Try to use PTFE composite type Stainless Backed Composite bushings.
Lubrication The PTFE-based sliding surface permits smooth, low-friction operation without lubrication or maintenance. During the running-in phase part of the covering layer of PTFE Composite dry sliding bearings is transferred to the mating surface and forms a physically bonded lubricant film.
Cross section of PTFE Composite
PTFE tin bronze copper layer sheet steel backing copper layer tin layer PTFE Composite
Long maintenance-free operating life due to low friction
Overview of Technical Data
PTFE Composite bearings offer many features and advantages
- maintenance-free operation
- very good frictional properties
- high load capacity
- operating temperatures up to 250 °C
- sliding velocity up to 2 m/s
- small operating clearance
These materiais consist of metal backing bonded to a porous bronze sintered layer with PTFE based polymer bearing layer.The metal backing provides mechanical strength, while the bronze sinter layer provides a strong mechanical bonding between the backing and the bearing lining,the PTFE based polymer offers exceptional low friction even under dry condition.
The PTFE-based sliding surface permits smooth, low-friction operation without lubrication or maintenance. During the running-in phase part of the covering layer of VIIPLUS PTFE Composite dry sliding bearings is transferred to the mating surface and forms a physically bonded lubricant film. The presence or continuous supply of oil or other non corrosive fluids may be advantageous and improve the perfomance of these bearings.
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 self-lubricating bearings 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.
Machining the bore of PTFE composite bushings
Guideline values for the requisite interference of the calibrating mandrel as a function of the desired widening of the bushing bore for various bushing bore diameters can be obtained from diagram 1. The diagram is based on tests with bushings of different sizes and valid for bushings mounted in a housing with an outside diameter DG = 2 * bushing outside diameter D . If mandrel expansion tests show that the bore is too wide, the calibrating mandrel should be reground and the tests repeated on new bushings.
The coefficient of friction for PTFE composite bearings increases at temperatures above +100 °C. Stick-slip effects are negligible for PTFE and POM bearings.
- Maintenance free
- Low friction coefficient
- Multiple areas of use
- Long lifetime
Type of applications
- Person lifts
- Packaging machines
- Pneumatic cylinders
- Cylindrical bearings
- Flanged bearings
- Thrust washers
- Slide plates
- Drawing details
Application of PTFE in agricultural machinery
With high strength and high temperature glass fiber reinforced epoxy resin as base, with special fibre and PTFE as the sliding layer, base material layer provides a good bearing performance, and grind resistant layer is provided under the condition of dry friction has very low friction due to the number of features, makes the bearing under the condition of low speed high load condition has excellent wear resistance and shock attack resistance ability, suitable for low speed high load conditions and have special request for corrosion field, such as lifting machinery, logistics, machinery, agricultural machinery and port machinery, etc.
|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|