Page 151 - IGUS Bearing

iglidur K iglidur K
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+170°C +170°C
50MPa 50MPa
Bearing technology | Plain bearings | iglidur K Technical data
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Permissible surface speeds Installation tolerances 100.0 0.25
0.24
iglidur K has been developed for low to medium surface iglidur K plain bearings are standard bearings for shafts 10.0 0.23
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speeds. The maximum values shown in table 03 can only with h-tolerance (recommended minimum h9). The 0.22
0.21
be achieved at low pressures. At the given speeds, friction bearings are designed for press-fit into a housing machined 1.0 0.20
can cause a temperature increase to maximum permissible to a H7 tolerance. After being assembled into a nominal 0.19
levels. In practice, though, this level is rarely reached due size housing, the inner diameter automatically adjusts to Surface pressure [MPa] 0.1 Coefficient of friction [µ] 0.18
0.17
to varying application conditions. the E10 tolerances. For particular dimensions the tolerance 0.16
Surface speed, page 48 differs depending on the wall thickness (please see product 0.01 0.001 0.01 0.1 1.0 10.0 0.15
range table). In relation to the installation tolerance, the 0 10 20 30 40 50 60
Temperature inner diameter changes with the absorption of humidity. Surface speed [m/s] Load [MPa]
The temperatures prevailing in the bearing system also Testing methods, page 61 Diagram 01: Permissible pv values for iglidur K plain bearing Diagram 05: Coefficient of friction as a function of the
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have an influence on the wear. With increasing temperatures, with a wall thickness of 1 mm dry operation against a steel pressure, v = 0.01m/s
the wear increases and this effect is significant when shaft at +20°C, mounted in a steel housing.
temperatures rise over +100°C. For temperatures over Chemicals Resistance
+70°C an additional securing is required. Alcohols + up to 0 80 8
Application temperatures, page 53 Diluted acids 0 up to – 7
Additional securing, page 53 Diluted alkalines + 60 6
Fuels + 5
Friction and wear Greases, oils without additives + 40 4 Free cutting steel Cf53, hard chromed 304 stainless steel
Similar to wear resistance, the coefficient of friction µ also Hydrocarbons + 20 3 H.a. aluminium HR carbon steel High grade steel
2
changes with the surface speed and load (diagrams 04 Strong acids – Wear [µm/km] 1 Cf53 steel
and 05). Strong alkalines 0 Load [MPa] 0 0
Coefficient of friction and surfaces, page 51 All data given at room temperature [+20°C] 20 50 80 120 150 170
Wear resistance, page 54 Table 02: Chemical resistance Temperature [°C]
Chemical table, page 1170 Diagram 02: Maximum recommended surface pressure as a Diagram 06: Wear, rotating with different shaft materials,
Shaft materials function of temperature (50MPa at +20°C) pressure, p = 1MPa, v = 0.3m/s
The friction and wear are also dependent, to a large Rotating Oscillating linear
degree, on the mating partner. Shafts that are too smooth Long-term m/s 1.0 0.7 3.0 5.0 45
increase both the coefficient of friction and the wear of Short-term m/s 2.0 1.4 4.0 40 rotating
the bearing. For iglidur K a ground surface with an Table 03: Maximum surface speeds 4.0 +23°C 35 oscillating
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30
average surface finish Ra = 0.15-0.2µm is recommended. 3.0 +60°C 25
Diagram 06 shows results of testing different shaft Dry Greases Oil Water 2.0 20
materials with plain bearings made from iglidur K. It Coefficient of friction μ 0.06-0.21 0.09 0.04 0.04 15
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is important to notice that with increasing loads, the Table 04: Coefficient of friction against steel (Ra = 1μm, Deformation [%] 1.0 Wear [µm/km] 10
5
recommended hardness of the shaft increases. The "soft" 50HRC) 0.0 0
shafts tend to wear more easily and thus increase the 0 10 20 30 40 50 60 0 10 20 30 40 50 60
wear of the overall system, if the loads exceed 2MPa. Housing Plain bearings Shaft Load [MPa] Load [MPa]
The comparison of rotation and pivoting shows that the Ø d1 [mm] H7 [mm] E10 [mm] h9 [mm] Diagram 03: Deformation under pressure and temperature Diagram 07: Wear for oscillating and rotating applications
wear is almost identical at a pressure up to 5MPa. The 0-3 +0.000 +0.010 +0.014 +0.054 -0.025 +0.000 with shaft material Cf53 hardened and ground steel, as a
higher the loads, the greater the difference (diagram 07). > 3-6 +0.000 +0.012 +0.020 +0.068 -0.030 +0.000 function of the load
> 6-10 +0.000 +0.015 +0.025 +0.083 -0.036 +0.000 0.30
Shaft materials, page 56 > 10-18 +0.000 +0.018 +0.032 +0.102 -0.043 +0.000
> 18-30 +0.000 +0.021 +0.040 +0.124 -0.052 +0.000 0.25
> 30-50 +0.000 +0.025 +0.050 +0.150 -0.062 +0.000
> 50-80 +0.000 +0.030 +0.060 +0.180 -0.074 +0.000 Coefficient of friction [µ] 0.20
> 80-120 +0.000 +0.035 +0.072 +0.212 -0.087 +0.000
> 120-180 +0.000 +0.040 +0.085 +0.245 -0.100 +0.000
Table 05: Important tolerances for plain bearings according 0.15 0.05 0.10 0.15 0.20 0.25 0.30 0.35
to ISO 3547-1 after press-fit Surface speed [m/s]
ASEAN 09/2023 ASEAN 09/2023 Diagram 04: Coefficient of friction as a function of the

surface speed, p = 0.75MPa

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