Page 575 - IGUS Bearing

iglidur UW iglidur UW
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+90°C +90°C
40MPa 40MPa
Bearing technology | Plain bearings | iglidur UW Technical data
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Permissible surface speeds Chemicals Resistance 100.0 0.7
iglidur UW is very good in both wet and dry operation. Alcohols + 10.0 0.6
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Due to hydrodynamic lubrication at high speeds, surface Diluted acids 0 up to – 0.5
speeds far above 2m/s can be achieved. The iglidur UW Diluted alkalines + 1.0 0.4
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plain bearings can be used in dry operation at speeds of Fuels + 0.3
up to 1.5m/s for short periods. Greases, oils without additives + Surface pressure [MPa] 0.1 Coefficient of friction [µ] 0.2
Surface speed, page 48 Hydrocarbons + 0.01 0.1
0.0
Strong acids – 0.001 0.01 0.1 1.0 10.0
Temperature Strong alkalines + up to 0 0 10 20 30 40
As stated earlier, iglidur UW plain bearings are required Surface speed [m/s] Load [MPa]
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for use in the low temperature range. As the liquid usually All data given at room temperature [+20°C] Diagram 01: Permissible pv values for iglidur UW plain Diagram 05: Coefficient of friction as a function of the
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dissipates heat in underwater applications the temperature Table 02: Chemical resistance bearing with a wall thickness of 1mm dry operation against pressure, v = 0.01m/s
Chemical table, page 1170
of the liquid is very important. For temperatures over +80°C a steel shaft at +20°C, mounted in a steel housing.
an additional securing is required. Rotating Oscillating linear
Application temperatures, page 53 Long-term m/s 0.5 0.4 2.0 40 8.0
Additional securing, page 53 35 7.0
Short-term m/s 1.5 1.1 3.0
30 6.0
Table 03: Maximum surface speeds
Friction and wear 25 5.0
The surface finish of the shafts should not be extremely Dry Greases Oil Water 20 4.0 Free cutting steel Cf53, hard chromed 304 stainless steel
smooth in order to prevent a high adhesion effect and Coefficient of friction μ 0.15-0.35 0.09 0.04 0.04 15 3.0 H.a. aluminium HR carbon steel High grade steel
2.0
10
the related increase of the coefficient of friction. Please Table 04: Coefficient of friction against steel (Ra = 1μm, 5 Wear [µm/km] 1.0 Cf53 steel
contact us for the specifications of shaft surface finishes Load [MPa] 0 0.0
in underwater applications. 50HRC) 20 30 40 50 60 70 80 90
Coefficient of friction and surfaces, page 51 Housing Plain bearings Shaft Temperature [°C]
Wear resistance, page 54 Diagram 02: Maximum recommended surface pressure as a Diagram 06: Wear, rotating with different shaft materials,
Ø d1 [mm] H7 [mm] E10 [mm] h9 [mm]
function of temperature (40MPa at +20°C) pressure, p = 1MPa, v = 0.3m/s
0-3 +0.000 +0.010 +0.014 +0.054 -0.025 +0.000
Shaft materials > 3-6 +0.000 +0.012 +0.020 +0.068 -0.030 +0.000
Diagram 06 and 07 display a summary of the results of > 6-10 +0.000 +0.015 +0.025 +0.083 -0.036 +0.000 7 60
tests with different shaft materials executed with plain > 10-18 +0.000 +0.018 +0.032 +0.102 -0.043 +0.000 6 50 rotating
oscillating
bearings made of iglidur UW. For low loads with rotation, > 18-30 +0.000 +0.021 +0.040 +0.124 -0.052 +0.000 5 +23°C 40
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the combinations achieve the best coefficient of wear with > 30-50 +0.000 +0.025 +0.050 +0.150 -0.062 +0.000 4 +60°C
high grade steel and 304 stainless steel. The conditions > 50-80 +0.000 +0.030 +0.060 +0.180 -0.074 +0.000 3 30
shift with increasing loads. It is also important to note that > 80-120 +0.000 +0.035 +0.072 +0.212 -0.087 +0.000 2 20
the wear rate increases significantly from loads > 5MPa. > 120-180 +0.000 +0.040 +0.085 +0.245 -0.100 +0.000 Deformation [%] 1 Wear [µm/km] 10
Shaft materials, page 56 0 0
Table 05: Important tolerances for plain bearings according 0 15 30 40 Cf53 hard 304SS HR carbon
to ISO 3547-1 after press-fit chromed steel
Installation tolerances Load [MPa]
iglidur UW plain bearings are standard bearings for shafts Diagram 03: Deformation under pressure and temperature Diagram 07: Wear for rotating and oscillating applications
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with h-tolerance (recommended minimum h9). After being with different shaft materials, p = 2MPa
assembled into a nominal size housing, the inner diameter
automatically adjusts to the E10 tolerances. For particular 0.5
dimensions the tolerance differs depending on the wall 0.4
Coefficient of friction [µ] 0.2
thickness (please see product range table).
Testing methods, page 61 0.3

0.1
0.05
0.10
Surface speed [m/s] 0.15 0.20 0.25 0.30
ASEAN 09/2023 ASEAN 09/2023 surface speed, p = 0.75MPa
Diagram 04: Coefficient of friction as a function of the

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