某变速箱用内圈单挡边圆柱滚子轴承疲劳断裂失效分析  

Fatigue Fracture Analysis of a Cylindrical Roller Bearing with Single Rib on Inner Ring Used in Gearbox

作　　者：孙晗[1] SUN Han(Automotive Bearing Division,Wafangdian Bearing Group Co.,Ltd.,Wafangdian 116300,China)

机构地区：[1]瓦房店轴承集团有限责任公司汽车轴承事业部,辽宁瓦房店116300

出　　处：《哈尔滨轴承》2024年第1期37-40,共4页Journal of Harbin Bearing

摘　　要：某变速箱整机试验运转30h后,变速箱用圆柱滚子轴承内圈发生断裂。对轴承内圈断口进行观察,并采用化学成分分析、金相组织检验及洛氏硬度检验等技术对内圈剥离原因进行了分析,同时采用仿真计算软件对试验工况进行了分析。结果表明:轴承原材料无明显缺陷,但经仿真计算发现轴承滚道发生边缘应力集中,且由于NJ结构内圈单挡边无轴向固定,滚动体与轴承中心轴向偏移0.25 mm后,边缘接触应力超过极限要求,致使内圈滚道边缘率先发生剥落,逐步扩展并断裂。After running for 30 hours,the inner ring of the cylindrical roller bearing broke during the gearbox test.The fracture surface of the inner ring of the bearing was observed,and techniques such as chemical composition analysis,metallographic structure inspection,and Rockwell hardness inspection were used to analyze the reasons for the fracture failure.Simulation calculation was used to analyze the test conditions.The results show that there are no obvious defects in the raw materials of the bearing,but simulation calculations have found that the edge stress concentration occurs in the bearing raceway.Due to the NJ structure,the inner ring has axial fixation with the single rib,and after the axial deviation between the rolling element and the bearing center is 0.25mm,the edge contact stress exceeds the limit requirement.The one edge of the inner ring raceway first peels off,gradually expands and fractures.

关 键 词：边缘应力集中 滚道剥离 轴向偏移 断裂 

分 类 号：TH133.33[机械工程—机械制造及自动化]