JDB Solid lubricating bearingsProduct description
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EPG Plastic Bearings
Applications ace high loads. As the perfect combination of fiber-reinforced and lubricating materials, it can be widely applied at 130 degrees.
1: continuous use temperature: -40 ℃ ~ + 130 ℃;
2: For high loads, common good;
3: Suitable for dry running, maintenance-free;
4: for different shaft materials;
5: for rotating, oscillating motion;
6: Anti-dust ability.
Material property sheet
| Material Properties Table | |||
| Common Capability | Unit | EPG | Testing Method |
| Density | g/cm³ | 1.46 | |
| Color | Dark grey | ||
| Max.water absorption,23℃/ 50% | [%weight] | 0.7 | DIN 53495 |
| Max.water absorption | [%weight] | ＜4 | |
| Dynamic friction /steel | μ | 0.08-0.18 | |
| Max.PV（dry） | MPa•m/s | 0.5 | |
| Mechanical behavior | |||
| E-module | MPa | 7,800 | DIN 53457 |
| Tensile strength,20℃ | MPa | 200 | DIN 53452 |
| Compressive strength | MPa | 80 | |
| Max.static pressure of the surface,20℃ | MPa | 80 | |
| Shore D hardness | 112 | DIN 53505 | |
| Physical and thermal properties | |||
| Continuous work tempreature | ℃ | +130 | |
| short-time work tempreature | ℃ | +220 | |
| Minimum operating temperature | ℃ | -40 | |
| Thermal conductivity | W/m•K | 0.25 | ASTM C 177 |
| Thermal expansion,23℃ | K | 9 | DIN 53752 |
| Conductive propertiesK-1•10-5 | |||
| Volume resisticity | Ωcm | ＞1013 | DIN IEC 93 |
| Surface resisticity | Ω | ＞1011 | DIN 53482 |
Bearing PV value
The max PV value of the EPG series bearing is 0.5N/mm2*m/s which detemines the load capacity of bearing is inversely proportional to the speed. Please refer to the chare for more detailed information (Graph EPG-1).
Bearing load, speed, temperature
EPG series bearings can withstand the maximum static load of 80Mpa, in this load the maximum compression deformation of the bearing reference chart EPG-2; The actual working load of the bearing is less than 80Mpa. The load is also affected by the running speed and temperature. The faster the speed (Vmax: 1.0m / s) will lead to the increase of the friction temperature, the temperature rise (Tmax: 130 ℃) Weaken, the load with the bearing temperature changes in reference to the chart EPG-3.
Coefficient of friction
The friction coefficient of the plain bearing is closely related to the bearing load, the running speed and the surface roughness of the shaft material. The friction coefficient of the EPG bearing decreases with increasing load (Fig. EPG-5) and increases with the running speed EPG-4); this shows that EPG bearings are suitable for high load and low speed applications; the shaft surface roughness of the more smooth or rough will lead to increased friction coefficient of bearings, EPG recommended surface roughness is Ra0.5 ~ Ra0.8 (chart EPG-6);
| EPG | Dry | Grease | Oil | Water |
| Friction coefficient μ | 0.08~0.18 | 0.09 | 0.04 | 0.04 |
Wear and shaft materials
Tests on different shafts by bearings show that EPG has the best performance on carbon and hard chrome shafts at low loads (see chart EPG-7 and chart EPG-8); Shaft hardness requirements are also higher; softer shaft easy to produce wear, leading to bearing wear also increased. When the bearing load exceeds 2MPa, the bearing wear will increase as the shaft hardness decreases. EPG-8 shows that the EPG is better than the rotary motion under the swinging motion. The wear of the EPG under the same working condition is smaller than that of the rotary motion, especially at high load.
Chemical resistance
EPG plastic bearings can resist weak base, weak acid and various types of lubricating oil corrosion.
Water absorption
In standard atmospheric pressure, EPG plastic bearing water absorption of 0.7%, immersion water, the maximum equilibrium rate of 4.0%; due to the characteristics of water absorption, we must consider the application of the bearing environment.
Anti-UV properties
EPG long exposure to ultraviolet light color will not change. Material properties are basically will not change.
Bearing installation
EPG series bearings with the tolerance
| d mm² | 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 |
