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GEAR HAVING EXCELLENT DEDENDUM FATIGUE LIFE AND CONTACT FATIGUE LIFE
GEAR HAVING EXCELLENT DEDENDUM FATIGUE LIFE AND CONTACT FATIGUE LIFE
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机译:齿轮具有出色的齿形疲劳寿命和接触疲劳寿命
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摘要
PROBLEM TO BE SOLVED: To provide a gear which is to be subjected to high loaded specific pressure in response to the recent demand for the miniaturization, weight reduction, and applied force increase of automotive parts and has improved pitting fatigue life. SOLUTION: In the gear having excellent dedendum fatigue life and contact fatigue life: compressive residual stress at the surface is =400 MPa; a slack quenched layer is 5-15 m thick; surface roughness Rmax is =4.5 m; the value of Sk which means skewness as the asymmetry parameter of surface roughness distribution satisfies -1.2=Sk-0.5; and the area ratio of retained austenite at the surface is =10%.
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机译:要解决的问题:提供一种齿轮,该齿轮将响应最近对汽车零件的小型化,减轻重量和增加作用力的需求而承受高负载的比压,并且具有改善的点蚀疲劳寿命。解决方案:在具有优异的齿根疲劳寿命和接触疲劳寿命的齿轮中:表面的压缩残余应力> = 400 MPa;松弛的淬火层厚度为5-15 m;表面粗糙度Rmax≤4.5m;作为表面粗糙度分布的不对称参数的,表示歪斜度的Sk的值满足-1.2 <= Sk <-0.5。表面残留奥氏体的面积率≤10%。
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