EPB24 Plastic Plain Bearings

Product Detail

EPB24 Plastic Plain Bearings

Standard material for automotive industrial. Best and economic material for high temperature application.Excellent wear resistance is available in the vehicle fuels.

Continuous working temperature: -40?~200?;

High temperature and lower cost;

High wear resistance under fuel oil;

Good chemical resistance;

Suitable for humid environment.

The Material Data Sheet

Typical Item	Standard	Unit	CSB-EPB24
Density	ISO1183	g/cm³	1.79
Color			Brown
Dynamic friction /steel(dry)			0.08-0.25
Max. PV (dry)		N/mm²×m/s	0.7
Max. roatating velocity		m/s	1.0
Max. oscillating velocity		m/s	0.7
Max. linear velocity		m/s	2.0
Tensile strength	ISO527	MPa	210
Compressive strength (Axial)		MPa	110
E-module	ISO527	MPa	10000
Max. static pressure of the surface, 20?		MPa	110
Shore hardness	ISO868	D	80
Continuous work temperature			-40/200
Short-time work temperature			-40/240
Thermal conductivity	ASTME1461	W/m×k	0.24
Linear coef. of thermal expansion	ASTMD696	K-1×10-5	5
Moisture absorption RH50/23?	ASTMD570	%	0.1
Max. water absorption, 23?		%	0.2
Flammability	UL94		V0
Volume resistivity	IEC60093	Ocm	>1013
Surface resistivity	IEC60093	O	>1012

PV Value of Bearings

The max PV value of the CSB-EPB24 series bearing is 0.45N/mm2*m/s which determines the load capacity of bearing is inversely proportional to the speed. Please refer to the chart for more detailed information (Graph EPB24-1).



The Relation of Load, Speed and Temperature

CSB-EPB24 allows the Max static load of 65Mpa, The max compressive deformation rate under the max load is listed in Graph EPB24-1, The actual load capacity of bearing is slightly less than 65Mpa, The bearing load is variable against the speed and temperature, Fast speed (Vmax: 1.0m/s) results into higher temperature (Tmax: 200?) which decreases the load capacity of the bearing. Please refer to the Graph EPB24-3 for such variation.



The Friction Factor,Wearing and shaft material

Friction Factor 
 Graph EPB24-4 shows the friction factor of CSB-EPB24 is not obviously effected by the operation speed when the loading is stable and Graph EPB24-5 shows it will be decreasing along with the loading is increased from 0 to 20 Mpa when the operation speed is unchanged, furthermore the friction factor will not be changed when the loading reaches 20Mpa upward. The friction factor of CSB-EPB24 is increased along with the increasing of the shaft roughness. The recommended shaft roughness is Ra0.1 to Ra0.6.

CSB-EPB24	Dry	Grease	Oil	Water
Friction coef. µ	0.10~0.30	0.09	0.04	0.04




Wearing and shaft material

Graph EPB24-7 and Graph EPB24-8 tells that the CSBEPB24 is very good for Hardened shaft and soft shaft and it features excellent both on hardened steel shaft and hardened shaft but the hardened chrome steel shaft is not good for CSB-EPB24 bearings. Graph EPB24-8 shows that the wearing of CSB-EPB24 is better on oscillation operation than on rotation operation. The wearing will be increased when the loading is over 10Mpa.



Chemical Resistance

The Chemical Resistance of CSB-EPB24 is fairly good against most of Acid and Alkalis.

Water Absorbability

The water absorb rate of CSB-EPB24 is less than 0.1% under the atmospheric pressure while it is less than 0.1% when the material is immerged into water. The material performance and dimensions of the material is stabilized for the applications under humid environment or even in the water.



UV Resistance

Disintegration could be possible for the material CSBEPB24 after long period of exposing under the UV ray and therefore the compressive strength will be reduced.

Bearing Installation

CSB-EPB24 The Interfit Tolerance

Diameter mm	Tolerance after fit E10	Fit Housing H7	Fit Shaft h9
>0~3	+0.014~+0.054	0~+0.010	0~-0.025
>3~6	+0.020~+0.068	0~+0.012	0~-0.030
>6~10	+0.025~+0.083	0~+0.015	0~-0.036
>10~18	+0.032~+0.102	0~+0.018	0~-0.043
>18~30	+0.040~+0.124	0~+0.021	0~-0.052
>30~50	+0.050~+0.150	0~+0.025	0~-0.062
>50~80	+0.060~+0.180	0~+0.030	0~-0.074
>80~120	+0.072~+0.212	0~+0.035	0~-0.087
>120~180	+0.085~+0.245	0~+0.040	0~-0.100