TAILIEUCHUNG - Tribology Lubricants and Lubrication 2012 Part 14

Tham khảo tài liệu 'tribology lubricants and lubrication 2012 part 14', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 317 The New Methods for Scuffing and Pitting Investigation of Coated Materials for Heavy Loaded Lubricated Elements Component gear method for evaluation of pitting wear of gears Similarly to scuffing gear tests the method for evaluation of pitting wear of gears has been originally developed by FZG Gear Research Centre in the Technical University of Munich. This method was also adapted for the investigation of PVD CVD coated gears at ITeE-PIB. The experiments are performed using the single-stage pitting test procedure PT C 10 90 in an FZG type gear test rig using C-PT gears - Fig. 15. Special coated gears C-PT type are run in the lubricant test at constant speed for a fixed time in dip lubrication system. The load stage is 9 or 10 giving 302 Nm and 372 of torque respectively. The oil is heated up to 90 C. The oil temperature is controlled and kept at constant level. The inspection of gears is performed every 7 or 14 hours. Fig. 15. Coated test gears used for testing pitting - type C-PT The result of the tests is the LC50 fatigue life related to 50 probability of failure. LC50 is defined as the number of load cycles when the damage area of the most damaged tooth flanks exceeds 4 about 5 mm2 . The total test time of each run is limited to 40 millions load cycles at pinion 300 operating hours . In some cases other criteria can be used. At least three valid runs are necessary to calculate the LC50 parameter. The main advantage of the method is the possibility of comprehensive testing on various low-friction and antiwear PVD CVD coatings intended for heavy-loaded machine elements. The method is realised by means of the worldwide popular back-to-back gear test rig. The test method has been successfully used for extensive research to determine the effect of low-friction and antiwear coatings on pitting wear. An example of the research on gear oils is presented below. The results indicate that for the coated coated pair pinion and wheel coated and coated pinion steel .

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