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DUB bush, PTFE lined, BRONZE backing, self lubricating dry bearings

 
 DUB
Material Specifications 
 
DUB
cylindrical bushings
     
 

  DUB bush, PTFE lined, BRONZE backing, self lubricating dry bearings  

Sintered PTFE and Bronze on Bronze Backing (Maintenance-free Material)
PTFE / Fibre + Bronze + Bronze Backing

Features
Suitable for dry running, low coefficient of friction, lower wear, good sliding characteristics, the transfer film created can protect the mating metal surface, suitable for rotary and oscillating movement. Very high chemical resistance, low absorption of water and swelling, also performs very good lubrication feature, the bronze backing provides the improved corrosion resistance comparing with SBU bearings.


Structures

1. PTFE/fibre mixture thickness 0.01~0.03mm, provides an excellent initial transfer film, which effectively coats the mating surfaces of the bearing assembly, forming an oxide type solid lubricant film.
2. Sintered bronze powder thickness 0.20-0.35mm, provides max. thermal conductivity away from the bearing surface, also serves as a reservoir for the PTFE/Fibre mixture.
3. Bronze backing, provides exceptionally high load carrying capacity, excellent heat dissipation and very good corrosion resistance.


Typical Applications

This material meets the demanding criteria for long life and trouble-free performance with or without lubricant, of high safety factor even. 
The bronze backing provides a high corrosion resistance, anti magnetic properties and a good thermal conductivity, The bearings are particularly appropriate for high temperature environment where no oil is efficient and the machine must be under successive long period working condition.
The typical applications covered Steel metallurgy industry such as bushes for roller grooves of successive casting machines, cement grouting pumps and screw conveyers for cement and so on.


Technical Data

Physical and Mechanical Properties

Usage

Thermal Conductivity λ

60

W/mK

dry

very good

Maximum Operating Temperature Tmax

280

°C

oil lubricated

good

Minimum Operating Temperature Tmin

-200

°C

grease lubricated

fair

Compressive Yield Strength σc

300

N/mm2

water lubricated

good

Maximum Static Load Psta,max

140

N/mm2

process fluid lubricated

fair

Maximum Dynamic Load Pdyn,max

140

N/mm2

 

Maximum Sliding Speed V-dry

2.5

m/s

Maximum PV Factor-dry, continuous operation

1.8

N/mm2 * m/s

Maximum PV Factor-dry, intermittent operation

3.5

N/mm2 * m/s

Coefficient of friction f-dry

0.02-0.25

 

 

Coefficient of friction f-oil lubricated

0.02-0.12

 

 


  DUB standard cylindrical bushings  

 


Other Standard DU-B Shapes

   

 


DU-B bearing & DUB bushing (SF-1B series)
 

     
BB3540DUB   4025DUB   4530DUB   5030DUB
             
gear pump bush      
Gear Pump Bush   BB5540DUB | 55x60x40 mm   BB6570145.5DUB | 65x70x14.5 mm   DU-B bearing | 25x28x30 mm
             
     
DU-B bush | 19.5x22.35x16 mm   1212DUB | 12 x 14 x 12 mm   DUB bearing | 22.35x25.55x31.75 mm   1820DUB | 18x20x20 mm

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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