Extended gear fatigue pitting life is not only an es-sential performance requirement for today’s auto-motiveand industrial gearoils butalso forautomatic transmission fluids (ATF) or continuously variable speed transmission (CVT) fluids [1, 2]. Paststudies had shown that both gear surface roughness and chemical and physical properties have a significant influence on the fluid’s pitting performance [3]. The fluid’s chemical and physical properties affect oil film thickness, boundary frictional coefficient and corrosiveness. The effect of surface roughness on metal fatiguebehaviorhas been studiedextensively and is apparentlyquite well understood [4–8]. Ithas been well established that surface roughness is a major factor influencing the formation of micropit-ting [7–9]. It also has been shown that micropitting is the most common cause of pitting in modern clean steels since current steel processing technol-ogy essentially eliminates subsurface inclusions [10, 11].
AGMA 04FTM4-2004 pdf download
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