TECHNOLOGY

TECHNOLOGY

° R&D

DSE BEARING Co., Ltd. manufactures metal bearings for marine engine and industrial plants

Problems with white metal bearings
Scratch
  • Abrasive wear 
  • Wiping
Discoloration
  • Tin oxide damage
  • Overheating
Fatigue
  • Crack
Void
  • Electrical pitting
  • Cavitation erosion
  • Corrosion
Actual case of accidents in which oil supply was suspended
  • System break down
  • Short maintenance term
  • Low reliability of whole system
  • Must be added back up system
  • Weakening price competitiveness caused by cost increase
  • Insecurity about reliability
  • Lack of technological competitiveness
Overview of composite bearings
Schematic diagram of fluid bearing in hybrid composite
Comparison of physical properties of white metal and composite materials
Material
Coefficient of thermal expansion
10-6/℃
Compressive strength
MPa
Elastic coefficient
GPa
Friction Coefficient
µ
Tensile strength
MPa
Shear strength
MPa
Adhesion strength
MPa
Hybrid composite
23 (Thickness)4.25(In-plane)
812
67
0.15
780
63.8
62
White metal
(ECKA TEGOSTAR)
21
190
57
0.68
78
-
71
Deviation
(prior art comparison)
2 (9.5%)[-16.7)
622 (327%)
10-18%
-5.75
702-900%
-
-9(-12.7%)
Deviation
Good
Excellent
Good
Excellent
Excellent
 
 
Evaluation
stress reduction
Shear stress
Impact resistance
Lubricity
High-load conditions
Shear stress
Sufficient
Comparative experiment with prior art under actual operating conditions
BRG typeTorque(N.m)Power(kw)BRG Temp #1(℃)Oil Temp #3()Oil Temp.△tMean
Pressure[Mpa]
mass
flow(I/min)
△X Amplitude(㎛)△Y Amplitude(㎛)Eccen.(mm)Eccen ratiohmin(mm)
Hybrid composite 1.8Mpa368.469.470.270.8231.9314.81.81.70.410.550.3
White metal 1.8Mpa383.472.2102.496.323.61.83321.91.61.70.380.470.4
Hybrid composite 2.5Mpa375.870.774.775.726.32.58314.21.320.390.510.4
White metal 2.5Mpa379.771.5112.6112.226.72.5314.71.41.70.360.430.4
Hybrid composite 4Mpa392.87480.481.629.74.1313.61.31.60.390.480.4
White metal 4Mpa397.875115.9131.825.14.02316.31.31.40.330.40.5
Hybrid composite 5Mpa416.278.479.181.431.45.01313.61.31.50.390.440.4
White metal 2.5Mpa379.771.5112.6112.226.75.5314.71.41.70.360.430.4
Hybrid composite 21604389970.270.727.51.88314.711.20.470.620.29
White metal 2160453.9102.510597.928.91.83230.910.360.470.4
Hybrid composite 60℃335.163.296.397.5372.5310.21.52.80.380.480.4
White metal 49℃36568.8114.8114.727.12.53141.41.90.360.450.4
  • Based on actual operating temperature: 93℃↓, 107℃ ↑warning, 121℃ ↑ forced suspension
  • Low power loss in all areas under the same conditions
  • High stability under the same conditions (estimated by ε value)
  • Derive a similar value of ε under the ship's load condition and high supply temperature of 10℃.
Comprehensive comparison of dynamic characteristics of white metal and composite bearings
BRG type
K11
K12
K21
K22
D11
D12
D21
D22
(Ma)cr
Hybrid composite 1.8Mpa9 (A)
3.0009
-2.459
2.248
2.541
5.045
2.224
2.224
4.139
2.803
White metal 1.8Mpa (B)
2.193
-2.535
2.448
2.74
4.584
3.157
3.157
5.464
2.47
Hybrid composite 2.5Mpa (A)
2.159
-2.414
2.295
3.038
4.1
3.366
3.366
5.476
2.577
White metal 2.5Mpa (B)
2.548
-2.714
2.634
2.18
5.695
2.363
2.363
4.915
2.368
Hybrid composite 4Mpa (A)
1.943
-2.713
2.228
3.039
4.262
3.58
3.58
5.684
2.587
White metal 4Mpa (B)
2.277
-3.004
2.695
2.274
5.867
2.732
2.732
5.452
2.35
Hybrid composite 5Mpa (A)
2.469
-2.639
2.635
2.29
5.434
2.55
2.55
5.085
2.377
Hybrid composite 2160 (A)
2.548
-2.714
2.634
2.18
5.695
2.363
2.363
4.915
2.266
White metal 2160 (B)
4.163
-0.232
3.463
2.165
4.831
2.177
2.177
3.969
1.459
Hybrid composite 60℃ (A)
1.185
-1.97
2.643
3.777
2.353
4.995
4.995
7.633
2.461
White metal 49℃ (B)
2.75
-2.392
2.552
2.279
5.262
2.295
2.295
4.587
2.397
  • Derive high critical mass values in all sectors under the same conditions
  • Same result as prior art at 10°C higher supply temperature under loading conditions of 200
Differentiation of hybrid composite bearing & Technical value
Differentiation of hybrid composite bearing

  • Improved properties in all fields to compare with white metal 18% ~900%
  • High efficiency (Reduce power loss-Torque)
  • High reliability under emergency situation (Oil cut, Lower amplitude, higher load, higher oil supply temp., etc)
Technical value

  • Reduce operating cost by high efficiency & reliability
  • Reduce back up system cost (No need jacking oil system)
  • Apply unique design by overcoming of mechanical limitation ( more than 2itmes higher load, higher wear resistance, lower power loss, lower amplitude, etc.)
  • If oil supplying temp. is higher due to you can’t sufficient oil cooling when your system has to be operated Middle east area, Africa, etc.), The hybrid composite bearing can give higher reliability & reducing power loss
  • Strong marketing factor by product differentiation

 Address : 75, Noksansandan 46-ro, Gangseo-gu, Busan, Republic of Korea

 E-mail : dsebearing@korea.com

 Phone : +82-51-831-2045~8

 Fax : +82-51-831-2049 / 2059


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