Page 276 - IGUS Bearing

iglidur E7 iglidur E7
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+70°C +70°C
18MPa 18MPa
Bearing technology | Plain bearings | iglidur E7 Technical data
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Permissible surface speeds Installation tolerances 100.0 0.25
iglidur E7 allows high surface speeds due to its excellent iglidur E7 plain bearings are standard bearings for 10.0
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coefficient of friction. Continuous rotation speeds of 0.5m/s shafts with h-tolerance (recommended minimum h9). The 0.20
are possible. The permitted speeds are clearly higher yet bearings are designed for press-fit into a housing machined 1.0
in linear movements or in short-term operation. Speeds to a H7 tolerance. After being assembled into a nominal 0.15
of over 3.0m/s have already been successfully tested in size housing, the inner diameter automatically adjusts to Surface pressure [MPa] 0.1 Coefficient of friction [µ]
linear applications. the E10 tolerances. For particular dimensions the tolerance
Surface speed, page 48 differs depending on the wall thickness (please see product 0.01 10.0 0.10
range table). 0.001 0.01 0.1 1.0 0 15 25 35 45
Temperature Testing methods, page 61 Surface speed [m/s] Load [MPa]
The maximum permissible temperature of +90°C should Diagram 01: Permissible pv values for iglidur E7 plain Diagram 05: Coefficient of friction as a function of the
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not be exceeded. Therefore the ambient temperature bearing with a wall thickness of 1mm dry operation against pressure, v = 0.01m/s
generated by friction has to be added. From +30°C Chemicals Resistance a steel shaft at +20°C, mounted in a steel housing
upwards, the bearing should be mechanically retained, Alcohols +
so as to avoid the bearing moving out of the hole. The Diluted acids 0 up to – 120 2.5
wear resistance also decreases exponentially from +90°C Diluted alkalines + 100
upwards. Fuels + 2.0
Application temperatures, page 53 Greases, oils without additives + 80 1.5
Additional securing, page 53 Hydrocarbons + 60 1.0 Free cutting steel Cf53, hard chromed 304 stainless steel
Strong acids – 40 H.a. aluminium HR carbon steel High grade steel
Friction and wear Strong alkalines + up to 0 20 Wear [µm/km] 0.5 Cf53 steel
Among all the iglidur materials, iglidur E7 exhibits the All data given at room temperature [+20°C] Load [MPa] 0 0.0
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lowest coefficient of friction. The average coefficient of Table 02: Chemical resistance 20 30 40 50 60 70 80
friction of all measurements, even with different shaft Chemical table, page 1170 Temperature [°C]
materials, is 0.11μ. The use of hard-anodised aluminium Diagram 02: Maximum recommended surface pressure as a Diagram 06: Wear, rotating with different shaft materials,
as a shaft material is also of importance. The comparison Rotating Oscillating linear function of temperature (18MPa at +20°C) pressure, p = 1MPa, v = 0.3m/s
with the rest of the iglidur materials shows that iglidur E7 Long-term m/s 0.5 0.4 2.0
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plain bearings are suitable for rather low loads. The Short-term m/s 0.8 0.6 3.0 10 350
influence of surface speed and load on the coefficient of Table 03: Maximum surface speeds 300 rotating
friction is small. The change of the coefficient of friction at 8 +23°C 250 oscillating
high loads is in the normal range (diagrams 04 and 05). Dry Greases Oil Water 6 +60°C 200
Surface finishes (Ra) of the shaft between 0.8µm are ideal. Coefficient of friction μ 0.09-0.23 0.09 0.04 0.04 4 150
The influence of the shaft material on the wear resistance Table 04: Coefficient of friction against steel (Ra = 1μm, 100
is significant. Even at low loads, we recommend to have 50HRC) Deformation [%] 2 Wear [µm/km] 50
a closer look into the wear database. 0 0
Coefficient of friction and surfaces, page 51 Housing Plain bearings Shaft 0 5 10 15 20 25 30 35 40 45 0 1 2 5 10 20
Wear resistance, page 54 Ø d1 [mm] H7 [mm] E10 [mm] h9 [mm] Load [MPa] Load [MPa]
0-3 +0.000 +0.010 +0.014 +0.054 -0.025 +0.000 Diagram 03: Deformation under pressure and temperature Diagram 07: Wear for oscillating and rotating applications
Shaft materials > 3-6 +0.000 +0.012 +0.020 +0.068 -0.030 +0.000 with shaft material Cf53 hardened and ground steel, as a
The shaft material has a great impact on the wear > 6-10 +0.000 +0.015 +0.025 +0.083 -0.036 +0.000 function of the load
resistance. In fact, all shaft materials (smooth or hardened) > 10-18 +0.000 +0.018 +0.032 +0.102 -0.043 +0.000 0.25
are suitable for use with iglidur E7, but the best results > 18-30 +0.000 +0.021 +0.040 +0.124 -0.052 +0.000
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are achieved with hard-anodised aluminium. In particular > 30-50 +0.000 +0.025 +0.050 +0.150 -0.062 +0.000 0.20
when used in linear motion, this running surface has proven > 50-80 +0.000 +0.030 +0.060 +0.180 -0.074 +0.000
its value. > 80-120 +0.000 +0.035 +0.072 +0.212 -0.087 +0.000 Coefficient of friction [µ] 0.15
Shaft materials, page 56 > 120-180 +0.000 +0.040 +0.085 +0.245 -0.100 +0.000
Table 05: Important tolerances for plain bearings according 0.10
to ISO 3547-1 after press-fit 0.10 0.15 0.20 0.25 0.30

Surface speed [m/s]
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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