GGB SY Cylindrical bimetallic bearings for high loads and rough operating conditions

GGB SY Cylindrical Bearings

SY Bimetal Plain Bearings to Standard SAE 792

CHARACTERISTICS

  • Bimetal bearing with steel backing and bronze overlay
  • Particularly suitable for high specific loads with oscillating motion and low frequency
  • Applicable in rough operation conditions
  • High load capacity, very good resistance to fatigue strength at higher temperatures

 

availability

Bearing forms available in standard dimensions
  • Cylindrical bushes
  • Thrust washers
Bearing forms made to order: cylindrical bushes and thrust washers with non-standard dimensions, sliding plates, customized bearing designs

STRUCTURE AND COMPOSITION

Steel Backing and Leaded Bronze Overlay

Steel + CuPb10Sn10 with indents

MICROSECTION

microsection of GGB SY bronze bearings and bronze bushings

Sliding layer with
lubrication indents

CuPb10Sn10 with
composition approx.:
Cu 80 %
Pb 10 %
Sn 10 %

Steel backing

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

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

N/mm2

N/mm2

300

140

Operating temperature

Min

Max greased

Max oil lubricated

°C

°C

°C

- 40

150

250

GREASE / Oil lubricated      
Maximum sliding speed, U   m/s

2.5

Maximum pU factor

 

N/mm2 x m/s

2.8

Coefficient of friction

Greased

Oiled

 

0.05 - 0.12

0.04 - 0.12

Recommendations      
Surface roughness, Ra

 

µm

≤ 0.8

Surface hardness

Normal

For longer service life

HB

HB

> 200

> 350

STRUCTURE AND COMPOSITION

Steel Backing and Leaded Bronze Overlay

Steel + CuPb10Sn10 with indents

MICROSECTION

microsection of GGB SY bronze bearings and bronze bushings

 

Sliding layer with
lubrication indents

CuPb10Sn10 with
composition approx.:
Cu 80 %
Pb 10 %
Sn 10 %

Steel backing

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

BEARING PROPERTIES

GENERAL   Unit Value
Maximum load, p

Static

Dynamic

psi

psi

44 000

20 000

Operating temperature

Min

Max greased

Max oil lubricated

°F

°F

°F

- 40

300

480

GREASE / OIL LUBRICATED      
Maximum sliding speed, U   fpm

500

Maximum pU factor

 

psi x fpm

80 000

Coefficient of friction

Greased

Oiled

 

0.05 - 0.12

0.04 - 0.12

RECOMMENDATIONS      
Surface roughness, Ra

 

µin

≤ 32

Surface hardness

Normal

For longer service life

HB

HB

> 200

> 350

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