JDB Solid lubricating bearingsProduct description
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EPJ Plastic Bearings
Low coefficient of friction and high wear resistance perfect combination. Rotary, linear and oscillating applications, wear resistance and friction coefficient remained almost the same.
1: continuous use temperature: -50 ℃ ~ + 90 ℃;
2: suitable for dry running, maintenance-free;
3: different shaft materials little wear;
4: low friction coefficient;
5: for flexible shaft;
6: low water absorption.
Material property sheet
| Material Properties Table | |||
| Common Capability | Unit | EPJ | Testing Method |
| Density | g/cm³ | 1.49 | |
| Color | Yellow | ||
| Max.water absorption,23℃/ 50% | [%weight] | 0.3 | DIN 53495 |
| Max.water absorption | [%weight] | ＜1.3 | |
| Dynamic friction /steel | μ | 00.06-0.18 | |
| Max.PV（dry） | MPa•m/s | 0.34 | |
| Mechanical behavior | |||
| E-module | MPa | 2,400 | DIN 53457 |
| Tensile strength,20℃ | MPa | 73 | DIN 53452 |
| Compressive strength | MPa | 60 | |
| Max.static pressure of the surface,20℃ | MPa | 35 | |
| Shore D hardness | 74 | DIN 53505 | |
| Physical and thermal properties | |||
| Continuous work tempreature | ℃ | +90 | |
| short-time work tempreature | ℃ | +120 | |
| Minimum operating temperature | ℃ | -50 | |
| Thermal conductivity | W/m•K | 0.25 | ASTM C 177 |
| Thermal expansion,23℃ | K | 10 | DIN 53752 |
| Conductive propertiesK-1•10-5 | |||
| Volume resisticity | Ωcm | ＞1013 | DIN IEC 93 |
| Surface resisticity | Ω | ＞1012 | DIN 53482 |
Bearing PV value
EPJ series bearing the maximum operating PV value of 0.4N / mm2 * m / s; thus determine the load bearing is inversely proportional to the speed and load, the details of access to chart EPJ-1.
Bearing load, speed, temperature
EPJ series bearings can withstand the maximum static load of 35Mpa, in this load the maximum compression deformation of the bearing reference chart EPJ-2; (Vmax: 1.5m / s) will lead to increased friction temperature, while the temperature rise (Tmax: 90 ℃) will lead to the gradual bearing capacity of the bearing capacity of the bearing capacity is less than 35Mpa, load is also affected by the speed and temperature, Weakened, the load with the bearing temperature changes in reference to the chart EPJ-3.
Coefficient of friction
Figure EPJ-4 shows that the friction coefficient of EPJ bearings in the load must change with the speed of the operation rate is relatively small; The EPJ-6 shows that the larger the roughness of the EPJ shaft material, the greater the friction coefficient, but the coefficient of friction tends to be stable when the roughness is greater than Ra0.5; this bearing is suitable for shaft roughness Degree is Ra = 0.1 ~ 0.4um.
| EPJ | Dry | Grease | Oil | Water |
| Friction coefficient μ | 0.05~0.15 | 0.09 | 0.04 | 0.04 |
Wear and shaft materials
Figure EPJ-8 shows that EPJ-8 is suitable for different shaft materials when the load is less than 2Mpa, but the friction and wear on the hard chrome shaft is the smallest. When EPJ-7 is the wear test result of EPJ bearing on different axes; When the load continues to increase, the wear resistance of the bearing in the stainless steel shaft is particularly prominent. EPJ-8 shows that the EPJ bearing is more suitable for rotary motion, but whether in rotary motion or swing movement of the bearing in the hard chrome shaft on the use of the effect is the best.
Chemical resistance
EPJ plastic bearings can resist weak base, weak acid and various types of lubricating oil corrosion.
Water absorption
In the standard atmospheric pressure, EPJ plastic bearing low water absorption of 0.2%, immersion water, the maximum equilibrium rate of 1.2%; because of its low water absorption characteristics, so the bearings can be used in general humid environment.
Anti-UV properties
EPJ long exposure to ultraviolet light color will not change. Material hardness, compressive strength and wear resistance will not change.
Bearing installation
EPJ series of 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 |
