ISSN   1004-0595

CN  62-1224/O4

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渐开线直齿圆柱齿轮接触疲劳失效成因再分析

Re-examining the Origins of Contact Fatigue Failure of Involute Cylindrical Spur Gears

  • 摘要: 联合采用表面失效分析和有限元应力分析的方法,研究了渐开线直齿圆柱齿轮接触疲劳失效的成因.结果表明:由啮入线至第一次双对轮齿啮合结束部分齿面上密集的表面点蚀与该段啮合齿面相对滑移大,所消耗的摩擦功最大,摩擦应力大于第二次双齿啮合部分,而且最大剪应力更靠近齿面等因素有关.靠近节线的齿根齿面上的片状大块剥落属次表面点蚀,是由于该部位的次表面剪应力最大,位置最深,并且承受了前一对轮齿脱离啮合带来的冲击作用.紧邻啮入线附近齿面的较浅的剥落点蚀是由于承受啮入冲击,最大剪应力较大且出现位置较浅,齿面相对滑移最大所造成的,并与该处的表面点蚀坑有关.

     

    Abstract: The origins of contact fatigue failure of involute cylindrical spur gears were investigated via surface failure analysis combined with finite element stress analysis. Results show that greater relative sliding, maximum exhausted frictional work and exposed to frictional stress greater than that during the second double tooth meshing,contributed to the densely covered surface pitting of the dedendum surface from the gear-in point to the lowest point of single tooth contact. Heavy spalling or subsurface initiated pitting in the dedendum surface close to the pitch line was resulted from the maximum Hertzian contact shear stress of maximum distance below surface and the impact as a result of disengagement of the foregoing meshing tooth. Shallower spalling in the surface immediately after the gear-in point was related to the impact of gear-in,shallower and relatively larger subsurface maximum shear stress and maximum relative sliding,and was promoted by the surface pitting in this region.

     

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