高DN值滚子轴承保持架断裂分析  

Analysis of roller bearing cage broken under high DN value

作　　者：刘鲁 霍帅 郑凯 王黎钦[2] LIU Lu;HUO Shuai;ZHENG Kai;WANG Liqin(Key Laboratory of Power Transmission Technology on Aero-Engine,Shenyang Engine Research Institute,Aero Engine Corporation of China,Shenyang 110015,China;School of Mechatronics Engineering,Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]中国航空发动机集团有限公司,沈阳发动机研究所航空发动机动力传输重点实验室,沈阳110015 [2]哈尔滨工业大学机电工程学院,哈尔滨150001

出　　处：《航空动力学报》2020年第10期2115-2122,共8页Journal of Aerospace Power

摘　　要：对高DN值(轴承内径与转速的乘积)滚子轴承保持架断裂的故障机理进行仿真,采用超高周疲劳理论对仿真结果进行分析,结果表明:以往基于高周疲劳概念的保持架设计方法不适用于高DN值轴承保持架,超长寿命期内造成断裂所需的应力远低于材料的疲劳极限。造成高DN值滚子轴承保持架断裂的主要应力来自高转速带来的离心应力,而兜孔圆角过小导致应力集中过大是造成轴承保持架断裂主要原因,因此增大保持架兜孔圆角或清根能够降低局部应力集中,有利于防止保持架的断裂,提高轴承的可靠性。The failure mechanism of high DN value(bearing inner diameter multiply speed) bearing cage was analyzed. The results of roller bearing cage broken under the theory of ultra-high cycle fatigue showed that the method of designing of cage based on high cycle fatigue didn’t apply to high DN value cage. The stress causing fracture within over-long design life was far below fatigue limit of the material. The centrifugal stress caused by high speed contributed a lot to high DN value bearing cage fracture, and the main reason causing cage fracture was attributable to stress concentration because of the small pocket fillet. Therefore increasing pocket fillet and clean-up machining would help avoid cage fracture, and increase reliability of bearings.

关 键 词：保持架断裂 高DN值 滚子轴承 兜孔圆角 超高周疲劳 

分 类 号：V233.45[航空宇航科学与技术—航空宇航推进理论与工程]