AGMA 98FTM8-1998
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ID： |
2FC883235E7645CAB3982093DAB62145 |
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文件大小(MB)： |
0.83 |
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页数： |
12 |
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文件格式： |
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日期： |
2007-12-7 |
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购买： |
文本摘录（文本识别可能有误，但文件阅览显示及打印正常，pdf文件可进行文字搜索定位）：
I,r,ì,98F颩8,New Test Methods for the Evaluation,of Wear, Scuffing and Pitting Capacity,of Gear Lubricants,by: B.-R. H鰄n, P. Oster, K. Michaelis, Gear Research,Centre (FZG), Germany,American,TECHNICAL PAPER,COPYRIGHT American Gear Manufacturers Association, Inc.,Licensed by Information Handling Services,New Test Methods for the Evaluation of Wear, Scuffing and,Pitting. Capacity of Gear Lubricants,B.-R. H鰄n, P. Oster, K. Michaelis, Gear Research Centre (FZG), Germany,[The statements and opinions contained herein are those of the author and should not be construed as an official action or,opinion of the American Gear Manufacturers Association.],Abstract,For maximum energy savings low viscosity lubricants are frequently used. Increasing transmitted power leads to higher,temperatures and thus thinner lubricating films. These tendencies increase the failure probability in gear contacts with,respect to wear, scuffing, micropitting and pitting performance.,New test methods on modified FZG gear test rigs were developed to evaluate the load carrying capability of gear,lubricants.,For the low speed regime a wear test using C-type gears at low pitch line velocity of 0.05 m/s, and two different,temperatures of 90 and 120 "C to consider different additive response at high loading of load stage 12(C/0.05/90:120/12),was developed and applied to many different lubricants.,New scuffing procedures for gear lubricants of scuffing performance between API GL 3 and GL5 were developed. The,step test A10/16.6R/90 uses A-type gears of 10 mm pinion face width at 16.6 m/spitch line velocity with a driven pinion.,A discrimination of all gear oils up to the level of API GL 4 is possible. A shock test S-A10/16.6R/90 with direct loading,in the expected load stage discriminates between GL 4 and GL 5 lubricants.,Different standard pitting tests are available for different lubricant viscosity grades using C-type gears at 8.3 m/s pitch,line velocity and 90 "C in load stages 9 (PT C/9/90) or 10 (PT C/10/90). For automotive applications load spectrum,testing is possible at low (PT C/LLS/90) and high (FT C/HLs/90) loads. For applications with long oil drain intervals a,combined pitting and oil ageing test was developed (PITS C i85 TS) using C-type gears at variable load, speed and,temperature conditions. At high temperature conditions between 120 and 150 "C the oil ageingproperties together with,their influence on pitting characteristics is evaluated in correlation to a reference oil.,The test methods are described. Test results with different market products are discussed.,Copyright O 1998,American Gear Manufacturers Association,1500 King Street, Suite 201,Alexandria, Virginia, 22314,October, 1998,ISBN: 1-55589-726-6,COPYRIGHT American Gear Manufacturers Association, Inc.,Licensed by Information Handling Services,. .,P,NEW TEST METHODS FOR THE EVALUATION OF WEAR,SCUFFING, AND PITTING CAPACITY OF GEAR LUBRICANTS,B.-R. H鰄n, P. Oster, K. Michaelis,Gear Research Centre (FZGI, Germany,1 Introduction,The lubricant as a design element can play an,important role in the slow speed wear, scuffing, micropitting,and pitting behavior of gears in power trains.,With the demand of extended oil drain intervals, predominantly,in automotive applications, not only the,Jerformance of the new oil but also that of used oils,with thermal and oxidative degradation has to be observed.,Base oil type, viscosity and additive system,influence the different failure modes. Comprehensive,knowledge of the lubricant performance under comparable,test conditions is the key factor for lubricant,optimization for transmissions in practice.,a*,A number of test methods was developed,using the FZG back-to-back gear test rig where over,500 machines are available world-wide. These methods,are the Chevron wear test A/0.57/120/10 for,tractor hydraulic fluids [ I I, the scuffing test A/8.3/90,[2, 31, the micropitting test GF C/8.3/90 [41 for industrial,gear oils, and the pitting test PT C/9:10/90 [51 for,automotive gear oils (see Table 1). Continuous oil,development, cost reduction and new market demands,made it necessary to develop new test methods for,gear oils. These new methods on the FZG gear test rig,are presented and discussed.,2 General Considerations on Test Strategies,The best test configuration for full comparability,is the actual gearbox under typical operating condia,-ions. For industrial gear applications this is always too,expensive and for automotive gear applications this is,mostly too time consuming.,The second best are test procedures using,defined test gears with high reproducibility in geometry,heat treatment and surface finish being exp……
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