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On Design ¡Service life of Oiles bearings ¡Clearance design Service life of Oiles bearings depends on application atmosphere and other relevant conditions. Below formula is determined from the relationship between the load and the sliding distance and should be regarded as rough standard for designing. Please inquire an Oiles representative for details. mm/(kgf/cm2Em/minEHr) 5~10|6 to 1 5~10|7 to 1 5~10|8 to 1 mm/(N/mm2Em/sEHr) 6~10|4 to 3~10|3 6~10|5 to 3~10|4 6~10|6 to 3~10|5 Lubrication conditions Dry Periodic lubrication Oil lubrication Specific wear rate depending on lubrication conditions Assumed wear amount(mm) F WK~P~V~T Clearance for Oiles bearings should be designed larger than those for regular plain bearings used under hydrodynamic lubrication. This is because frictional heat and thickness of solid lubricant film generated in solid lubrication conditions is larger compared to hydrodyanamic lubrication. Clearance should be corrected for the bearings where swelling is expected such as underwater applications, chemical submersion and in high temperature applications. Fitting design for high temperature applications œWhen metallic bearing is to be used at over 100 degree C, design the clearance by adding heat expansion amount indicated below to the inner diameter dimension tolerance at the room temperature indicated in the standard fitting table. œWhen temperature goes down to a room temperature after exposed in high temperature, interference may disappear by stress relaxation and the bearing may come off or sliding at outer diameter of the bearing may occur. As a prevention measure, implement detent screwing. ¦For plastic bearings, please inquire an Oiles representative for the details Correction value for swelling of bearing If submerged underwater, Oiles 425 and Oiles 470 are swelled due to moisture absorption. For details, please refer to page 345 and 346. Heat expansion amount  Coefficient of thermal expansion of shaft ~ shaft diameter ~iambient temperature | room temperaturej Shaft material Coefficient of thermal expansion This formula for determining wear amount is derived from the idea that the wear is proportional to load and sliding distance. Other factors such as velocity, load, mode of motion, kind of lubrication,clearance,surface roughness of mating material and foreign particles are disregarded. This should be treated as rough standard. Coefficient of thermal linear expansion of the shaft 1.12~10|5/Ži20 to 300Žj 1.29~10|5/Ži20 to 300Žj 1.78~10|5/Ži20 to 300Žj 1.21~10|5/Ži20 to 300Žj 1.62~10|5/Ži20 to 300Žj Soft steel Ni-Cr steel SUS304 SUS431 SUS316 Caution Specific wear amount KF mm/(N/mm2Em/sEHr)o mm/(kgf/cm2Em/minEHr)p Design pressure P F N/mm2 {kgf/cm2} Sliding velocity V F m/s {m/min} Sliding hours T F Hr Service Life of Oiles Bearings and Clearance 343Selection Guide Product Air Bearings Metallic Bearing Multi-layer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter