变速箱油泵总成失效原因分析  

Analysis on Cause for Failoure of Gearbox Oil Pump A ssembly

作　　者：罗慧琪 陈启略 范汝兰 黄秋庆 LUO Huiqi;CHEN Qilue;FAN Rulan;HUANG Qiuqing(SAGW LiuZhou Automobile Transmission Co.,Ltd.,Liudong Branch,Liuzhou 545005,Guangxi China;SAIC-GM-Wuling Automobile Co.,Ltd.,Liuzhou 545007,Guangxi China)

机构地区：[1]柳州上汽汽车变速器有限公司柳东分公司,广西柳州545005 [2]上汽通用五菱汽车股份有限公司,广西柳州545007

出　　处：《热处理》2021年第5期43-46,共4页Heat Treatment

摘　　要：某公司CVT变速箱油泵总成运行中因轴断裂而失效。对失效的油泵总成组件进行了断口分析及几何形状、表面和心部硬度、有效硬化层深度、显微组织、化学成分测定。结果表明:断裂轴的成分、硬度、显微组织和有效硬化层深度基本合格,但其转子、定子和叶片的厚度超过要求值,致使转子、定子端面与泵盖面之间运行时相互摩擦、刮蹭,使轴受力不均匀而快速剪切断裂。CVTgearbox oil pump assembly failed because of axle fracturing in operating in a company.The failed oil pump assembly was tested for fracture form,geometric shape,surface and core hardnesses,effective hardening depth,microstructure and chemical composition.The results showed that the compos ition,hardness,microstructure and effective hardening depth conformed basically with the requirements,however,the thickness of rotor,stator and blades all exceeded the required value,resulting in fraction and scratching between the rotor and stator end faces and the pump cover face,and rapid shear fracturing of the axle due to non-uniform force acting on it.

关 键 词：油泵总成 几何形状 刮蹭 剪切韧窝 

分 类 号：TG115[金属学及工艺—物理冶金]