GGB DP4-B Cylindrical bushes

DP4-B Metal-Polymer Bronze Backed PTFE Plain Bearing

CHARACTERISTICS

  • Good wear and low friction performance over a wide range of loads, speeds and temperatures in dry running conditions
  • Very good performance in lubricated applications
  • Good performance in greased applications
  • Suitable for linear, oscillating and rotating movements
  • Bronze back offers improved corrosion resistance in humid/saline environments
  • Lead-free material compliant to EVL, WEEE, and RoHS specifications

availability

Bearing forms available in standard dimensions
  • Cylindrical bushes
  • Flanged bushes
  • Sliding plates
Bearing forms made to order: standard forms in special dimensions, thrust washers, flanged thrust washers, half-bearings, special shapes obtained by stamping or deep drawing, bearings with locating notches, lubricant holes and machined/stamped grooves

STRUCTURE AND COMPOSITION

  • Metal-Polymer Composite Material
  • Bronze Back + Porous Bronze Sinter +
  • PTFE + Fillers

MICROSECTION

Microsection of GGB DP4-B antifriction bearings with bronze backing

 

Sliding layer
PTFE +
Fillers

Porous Bronze
Sinter

 

Bronze Backing

 

OPERATING PERFORMANCE
Dry Good
Oil lubricated Very Good
Grease lubricated Good
Water lubricated Good
Process fluid lubricated Good

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

N/mm2

N/mm2

140

140

Operating temperature

Min

Max

°C

°C

- 200

280

Coefficient of linear thermal expansion

Parallel to the surface

10-6/K

18

Normal to the surface 10-6/K 36

 

Dry      
Maximum sliding speed, U  

m/s

2.5
Maximum pU factor

 

N/mm² x m/s

1.0

Coefficient of friction     0.04 - 0.25 *

 

OIL LUBRICATED      
Maximum sliding speed, U   m/s 5.0
Maximum pU factor  

N/mm² x m/s

10.0
Coefficient of friction    

0.02 - 0.08 *

 

Recommendations      
Shaft surface roughness, Ra

Dry

Lubricated

µm

µm

0.3 - 0.5

0.05 - 0.40 *

Shaft surface hardness

Unhardened acceptable, improved bearing life > 200HB

 

* Depending on operating conditions

STRUCTURE AND COMPOSITION

  • Metal-Polymer Composite Material
  • Bronze Back + Porous Bronze Sinter +
  • PTFE + Fillers

MICROSECTION

Microsection of GGB DP4-B antifriction bearings with bronze backing

 

Sliding layer
PTFE +
Fillers

Porous Bronze
Sinter

 

Bronze Backing

 

OPERATING PERFORMANCE
Dry Good
Oil lubricated Very Good
Grease lubricated Good
Water lubricated Good
Process fluid lubricated Good

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

psi

psi

20 000

20 000

Operating temperature

Min

Max

°F

°F

- 328

536

Coefficient of linear thermal expansion

Parallel to the surface

10-6/F

10

Normal to the surface 10-6/F 20
DRY      
Maximum sliding speed, U   fpm

500

Maximum pU factor

 

psi x fpm

29 000

Coefficient of friction    

0.04 - 0.25 *

OIL LUBRICATED      
Maximum sliding speed, U   fpm

1 000

Maximum pU factor   psi x fpm

286 000

Coefficient of friction    

0.02 - 0.08

RECOMMENDATIONS      

Shaft surface roughness, Ra

Dry

Lubricated

µin

µin 

12 - 20

≤ 2 - 16 *

Shaft surface hardness Unhardened acceptable, improved bearing life > 200HB  

* Depending on operating conditions 

Case Studies

GGB self-lubricating HPM hydro bearings and HPF hydropower bearings specified for the belo monte project

Belo Monte Hydropower

Brazil’s Belo Monte Hydroelectric Dam is a complex of dams, numerous dykes and a series of canals supplying two different power stations with water.

Testimonial

GGB PTFE plain bearings are mounted on curiosity, the mars rover developed by NASA

Testimonial

GGB DX bearings selected by Siemag for critical brake applications
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