论文信息 - Wear of Spur Gears Having a Dithering Motion and Lubricated With a Perfluorinated Polyether Grease

Wear of Spur Gears Having a Dithering Motion and Lubricated With a Perfluorinated Polyether Grease

Abstract Gear contact surface wear is one of the important failure modes for gear systems. Dedicated experiments are required to enable precise evaluations of gear wear for a particular application. The application of interest for this study required evaluation of wear of gears lubricated with a grade 2 perfluorinated polyether grease and having a dithering (rotation reversal) motion. Experiments were conducted using spur gears made from AISI 9310 steel. Wear was measured using a profilometer at test intervals encompassing 10,000 to 80,000 cycles of dithering motion. The test load level was 1.1 GPa maximum Hertz contact stress at the pitch-line. The trend of total wear as a function of test cycles was linear, and the wear depth rate was approximately 1.2 nm maximum wear depth per gear dithering cycle. The observed wear rate was about 600 times greater than the wear rate for the same gears operated at high speed and lubricated with oil. Introduction Gear contact surface wear is one of the important failure modes in gear systems. Wear and the associated material loss can lead to structural failure (gear tooth fracture). Wear can also lead to changes in vibration and noise behavior (ref. 1 to 3). In addition, wear can change the patterns of gear contact such that the altered load distributions and contact stresses will accelerate the occurrence of other failure modes such as pitting and scoring (ref. 4). Gear wear debris can also be detrimental to the performance of bearings or other components of a drive system (ref. 5). The study of wear is becoming one of the emerging areas of gear research. A number of recent wear modeling efforts (refs. 6 to 10) form a solid foundation for studying gear wear. The common thread to these studies is that all use the well-known Archard’s wear model (ref. 11) in conjunction with a gear contact model and relative sliding calculations. Archard’s wear equation can be expressed for a local point on one of the contacting gear surfaces as

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