Page 359 - IGUS Bearing

iglidur H370 iglidur H370
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+200°C +200°C
75MPa 75MPa
Bearing technology | Plain bearings | iglidur H370 Technical data
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Permissible surface speeds Chemicals Resistance 100.0 0.25
The maximum permitted surface speed is dependent on Alcohols + 10.0 0.20
whether the temperature at the bearing point becomes too Diluted acids + up to 0 0.15
high or not. iglidur H370 is suitable for surface speeds Diluted alkalines + 1.0
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of 1.2m/s (rotating) or 4m/s (linear). The maximum values Fuels + 0.10
stated in table 03 are valid only with minimum pressure Greases, oils without additives + Surface pressure [MPa] 0.1 Coefficient of friction [µ] 0.05
loads and are often not attained in practice. Hydrocarbons +
Surface speed, page 48 Strong acids + up to – 0.01 0.001 0.01 0.1 1.0 10.0 0.00 0 15 30 45 60 75
Strong alkalines +
Temperature Surface speed [m/s] Load [MPa]
With increasing temperatures, the compressive strength of All data given at room temperature [+20°C] Diagram 01: Permissible pv values for iglidur H370 with a Diagram 05: Coefficient of friction as a function of the
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iglidur H370 plain bearings decreases. The temperatures Table 02: Chemical resistance wall thickness of 1mm dry operation against a steel shaft at pressure, v = 0.01m/s
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Chemical table, page 1170
prevailing in the bearing system also have an influence on +20°C, mounted in a steel housing
the wear. The wear rises with increasing temperatures. Rotating Oscillating linear
For temperatures over +100°C an additional securing is Long-term m/s 1.2 0.8 4.0 80 8.0
required. Short-term m/s 1.5 1.1 5.0 70 7.0
Application temperatures, page 53 60 6.0
Additional securing, page 53 Table 03: Maximum surface speeds 50 5.0
40 4.0
Dry Greases Oil Water 30 3.0 Free cutting steel Cf53, hard chromed HR carbon steel 304 stainless steel High grade steel
Friction and wear Coefficient of friction μ 0.07-0.17 0.09 0.04 0.04 20 2.0 H.a. aluminium
The coefficient of friction alters only little, like the wear Table 04: Coefficient of friction against steel (Ra = 1μm, 10 Wear [µm/km] 1.0 Cf53 steel
resistance with increasing load and surface speed (diagram Load [MPa] 0 0.0
04 and 05). 50HRC) 20 50 80 120 150 200
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] F10 [mm] h9 [mm]
function of temperature (75MPa at +20°C) pressure, p = 1MPa, v = 0.3m/s
0-3 +0.000 +0.010 +0.006 +0.046 -0.025 +0.000
Shaft materials > 3-6 +0.000 +0.012 +0.010 +0.058 -0.030 +0.000
Diagram 06 and 07 display a summary of the results of > 6-10 +0.000 +0.015 +0.013 +0.071 -0.036 +0.000 8 22.5
tests with different shaft materials executed with plain > 10-18 +0.000 +0.018 +0.016 +0.086 -0.043 +0.000 7 20.0 rotating
oscillating
bearings made of iglidur H370. For loads up to 2MPa > 18-30 +0.000 +0.021 +0.020 +0.104 -0.052 +0.000 6 +23°C 17.5
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+60°C
15.0
in rotating applications, the hard-chromed shaft is the > 30-50 +0.000 +0.025 +0.025 +0.125 -0.062 +0.000 5 12.5
best material for the iglidur H370 plain bearings. The > 50-80 +0.000 +0.030 +0.030 +0.150 -0.074 +0.000 4 10.0
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high coefficient of wear with 304 stainless steel shafts, > 80-120 +0.000 +0.035 -0.036 +0.176 -0.087 +0.000 2 7.5
which due to their extremely ground surfaces are prone > 120-180 +0.000 +0.040 +0.043 +0.203 +0.000 +0.100 Deformation [%] 1 Wear [µm/km] 5.0
2.5
to the stick-slip effect, is striking. Despite same values 0 0.0
in the lowest range, the HR carbon steel shaft shows Table 05: Important tolerances for plain bearings according 0 25 50 75 Cf53 hard 304SS HR carbon
already better values than Cf53 with loads of 2MPa. On to ISO 3547-1 after press-fit Load [MPa] chromed steel
the other hand, the 304 stainless steel shaft shows a clear Diagram 03: Deformation under pressure and temperature Diagram 07: Wear for rotating and oscillating applications
advantage in pivoting movements. with different shaft materials, p = 2MPa
Shaft materials, page 56
0.4
Installation tolerances
iglidur H370 plain bearings are standard bearings for 0.3
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shafts with h tolerance (recommended minimum h9).
The bearings are designed for press-fit into a housing Coefficient of friction [µ] 0.2
machined to a H7 tolerance. After being assembled into a
nominal size housing, in standard cases the inner diameter
automatically adjusts to the F10 tolerances. For particular 0.1
0.05
0.10
dimensions the tolerance differs depending on the wall Surface speed [m/s] 0.15 0.20 0.25 0.30 0.35
thickness (please see product range table).
Testing methods, page 61 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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