Page 233 - IGUS Bearing

iglidur L250 iglidur L250
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+90°C +90°C
45MPa 45MPa
Bearing technology | Plain bearings | iglidur L250 Technical data
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Permissible surface speeds Chemicals Resistance 100.0 0.7
iglidur L250 has been developed especially for high Alcohols + up to 0 10.0 0.6
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surface speeds with low loads. Besides the physical limit, Diluted acids 0 up to – 0.5
which is pre-set by the heating of the bearing, the coefficient Diluted alkalines + 1.0 0.4
of wear also acts limiting if rapidly high glide paths emerge Fuels + 0.3
at high peripheral speeds and the permitted wear limit is Greases, oils without additives + Surface pressure [MPa] 0.1 Coefficient of friction [µ] 0.2
thus reached earlier. The maximum speeds are shown Hydrocarbons + 0.1
in table 03. Strong acids – 0.01 0.001 0.01 0.1 1.0 10.0 0.0
Surface speed, page 48 Strong alkalines 0 0 10 20 30 40 50 60 70 80
Surface speed [m/s] Load [MPa]
All data given at room temperature [+20°C]
Temperature Diagram 01: Permissible pv values for iglidur L250 with a Diagram 05: Coefficient of friction as a function of the
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iglidur L250 plain bearings can be used at temperatures Table 02: Chemical resistance wall thickness of 1mm dry operation against a steel shaft at pressure, v = 0.01m/s
Chemical table, page 1170
up to +180°C for short periods. Note that a mechanical +20°C, mounted in a steel housing
securing of the bearing is recommended from temperatures Rotating Oscillating linear
of +55°C. Higher temperatures can also cause the plain Long-term m/s 1.0 0.7 2.0 120 0.6
bearing to lose its press-fit and move in the hole. Short-term m/s 1.5 1.1 3.0 100 0.5
Application temperatures, page 53
Additional securing, page 53 Table 03: Maximum surface speeds 80 0.4
60 0.3
Dry Greases Oil Water Free cutting steel Cf53, hard chromed HR carbon steel 304 stainless steel High grade steel
Friction and wear Coefficient of friction μ 0.08-0.19 0.09 0.04 0.04 40 0.2 H.a. aluminium
In the best pairing (with 304 stainless steel shafts), coefficient Table 04: Coefficient of friction against steel (Ra = 1μm, 20 Wear [µm/km] 0.1 Cf53 steel
of friction of 0.14µ is already reached with low loads. Load [MPa] 0 0.0
Coefficient of friction under 0.1 was measured already 50HRC) 20 30 40 50 60 70 80 90
below 10MPa (diagrams 04 and 05). Housing Plain bearings Shaft Temperature [°C]
Coefficient of friction and surfaces, page 51 Ø d1 [mm] H7 [mm] E10 [mm] h9 [mm] Diagram 02: Maximum recommended surface pressure as a Diagram 06: Wear, rotating with different shaft materials,
Wear resistance, page 54 function of temperature (45MPa at +20°C) pressure, p = 1MPa, v = 0.3m/s
0-3 +0.000 +0.010 +0.014 +0.054 -0.025 +0.000
> 3-6 +0.000 +0.012 +0.020 +0.068 -0.030 +0.000
Shaft materials > 6-10 +0.000 +0.015 +0.025 +0.083 -0.036 +0.000 200
As seen in diagram 06, many shafts are recommendable for > 10-18 +0.000 +0.018 +0.032 +0.102 -0.043 +0.000 10 180 rotating
oscillating
low loads and low rotations. The low coefficient of friction is > 18-30 +0.000 +0.021 +0.040 +0.124 -0.052 +0.000 +23°C 160
140
additionally retained over a wide range of recommendable > 30-50 +0.000 +0.025 +0.050 +0.150 -0.062 +0.000 +60°C 120
shaft surfaces finish. For loads higher than 1MPa, particular > 50-80 +0.000 +0.030 +0.060 +0.180 -0.074 +0.000 5 100
80
attention should be paid to the shaft material used. > 80-120 +0.000 +0.035 +0.072 +0.212 -0.087 +0.000 60
Shaft materials, page 56 Deformation [%] 40
> 120-180 +0.000 +0.040 +0.085 +0.245 -0.100 +0.000 0 Wear [µm/km] 20
Table 05: Important tolerances for plain bearings according 0
Installation tolerances 0 15 30 45 0 5 10 15 20 25 30 35 40 45
iglidur L250 plain bearings are standard bearings for to ISO 3547-1 after press-fit Load [MPa] Load [MPa]
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shafts with h-tolerance (recommended minimum h9). The Diagram 03: Deformation under pressure and temperature Diagram 07: Wear for oscillating and rotating applications
bearings are designed for press-fit into a housing machined with shaft material Cf53 hardened and ground steel, as a
to a H7 tolerance. After being assembled into a nominal function of the load
size housing, the inner diameter automatically adjusts to 0.5
the E10 tolerances. For particular dimensions the tolerance 0.4
Coefficient of friction [µ] 0.2
differs depending on the wall thickness (please see product
range table). 0.3
Testing methods, page 61

0.1
0.10
0.05
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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