某发动机曲轴后油封异响分析  

Abnormal Sound Analysis of Crankshaft Rear Oil Seal of An Engine

作　　者：张哲林 杨亚辉 白国栋 朱运杰 谢棋 白奎 Zhang Zhe-lin;Yang Ya-hui;Bai Guo-dong;Zhu Yun-jie;Xie Qi;Bai Kui(Ningbo Geely Royal Engine Components Co.,Ltd,Ningbo 315336,China)

机构地区：[1]宁波吉利罗佑发动机零部件有限公司,浙江宁波315336

出　　处：《内燃机与配件》2024年第1期64-66,共3页Internal Combustion Engine & Parts

摘　　要：某发动机的曲轴后油封在整车工厂零公里处,在发动机怠速时有异响发生。本文通过对故障发动机的零部件进行拆解分析,并经过故障再现,确定异响机理为:油封本体耐负压指标不足,外加回油不畅,在油封自带的“泵吸效应”下,空气由发动机外部进入发动机内腔,在油封唇口处发生油封唇口与曲轴的干摩擦声,并伴随有空气流过的口哨声,导致异响发生。为了解决该异响问题,对曲轴后油封本体结构及回油结构进行调整优化。经过试验验证,整改方案确认有效。本次分析为问题的关闭,以及后续新项目的油封设计选型及布置提供了宝贵经验。The crankshaft rear oil seal of an engine is located at zero kilometers of the whole vehicle factory,and abnormal sound occurs when the engine is idling.Through disassembling and analyzing the parts of the faulty engine and reproducing the fault,the abnormal sound mechanism is determined as follows:The negative pressure resistance index of the oil seal body is insufficient,and the oil return is not smooth.Under the"pumping effect"of the oil seal,the air enters the inner cavity of the engine from the outside of the engine,and the dry friction sound between the oil seal lip and the crankshaft occurs at the lip of the oil seal,and is accompanied by the whistling sound of air flow,resulting in abnormal noise.In order to solve the abnormal sound problem,the structure of crankshaft rear oil seal body and oil return structure are adjusted and optimized.Through the test verification,the rectification plan confirmed to be effective.This analysis provides valuable experience for the closure of the problem and the selection and layout of oil seal design for subsequent new projects.

关 键 词：曲轴后油封 异响 解决方案 

分 类 号：U464.133.3[机械工程—车辆工程]