发动机缸盖止推面烧结失效分析及解决措施.pdf

第5期
内燃机
2015年10
月
Internal Combustion Engine
ct.2015
发动机缸盖止推面烧结失效分析及解决措施
鲁志远,贾合正,张莹,常进才,周硕
(1.长城汽车股份有限公司技术中心,河北保定071000
2.河北省汽车工程技术研究中心,河北保定071000
摘要:某六缸增压直喷汽油机在试验过程中出现缸盖排气侧止推面烧结问题。为解决此问题,首先对可能造成止推面烧结
的原因逐一进行排査,再通过仿真分析、试验验证等方法对问题原因进行确认。结果表明,缸盖后端结构强度差,后端轴
承座润滑压力、流量偏低,且缸盖排气側止推面与凸轮轴止推法兰接触宽度偏大,综合以上原因造成止推面烧结。针对止
推面烧结问题,制定了提髙缸盖结构强度、机油压力、减小接触宽度等方案。经试验验证,以上方案可以解决缸盖轴承端
面烧结问题。
关键词:直喷汽油机;轴承端面磨损;失效分析;解决措施
中图分类号:TK412
文献标识码:B
文章编号:1000~6494(2015)05-0050-04
Analysis and Solution to Thrust Surface Sintering of Cylinder Head
LU Zhiyuan, LA Hezheng, ZHANG Ying, CHANG Jincai, ZHOU Shuo
(1. Technical Center, Great Wall Moor Co, Ltd, Baoding 071000
2. Hebei Automobile Engineering Technology Research Center, Baoding 071000)
Abstract: This paper shows a problem of thrust surface sintering occurred on a sixc linder turbocharged direct injection gasoline
engine on exhaust side of cylinder ea. T solve this problem, firstly, it needs to check the possible causes which result in the thrust
sur ace sinering ll Secondly, find out the real reason by means of simulation analysis and test results, and then put forward an
available solution. Finally, as the results indicate, the structure strength of cylinder head at rear end is insufficient, the bearing surface at
rear end lacks enough lubrication because of too low oil pressure and flow, the contact width between thrust surface and thrust flange of
exhaust camshaft is too large. Based on these causes, this paper proposed there plans to solve the sintering problem improve the strength
of structure of cylinder head at ear end, me e oil pressure and decrease the contact with. At last, we got obvious benefits from this
kind of solution verified by test results
Key words: direct injection gasoline engine; thrust surface sintering; failure analysis; solution
0前言
侧止推面磨损严重导致抱轴烧结,见图1。前期发
动机试验过程中,已连续出现3台发动机排气侧止
某六缸增压直喷汽油机在试验过程中后端出现
异响,拆解发动机发现缸盖排气侧止推面烧结导致推面异常磨损的问题,进气侧止推面却均无磨损。
凸轮轴抱轴。造成该问题的原因较多,涉及到发动
机的零部件质量、产品设计、润滑系统等因素,需
要通过理论分析及试验的方法进行逐一分析验证。
1问题调查
该发动机200h全速全负荷试验运行到40h时,
图1排气侧止推面烧结状态
发动机后端出现正时异响,拆机发现缸盖后端排气
2轴承端面异常磨损原因分析
作者简介:鲁志远(1986-),男,助理工程师,主要从
事发动机缸体、缸盖等零部件的设计开发工作。
2.1零部件质量、装配过程排查
收稿日期:2015-04-21
经排査4台故障发动机缸盖、缸盖罩、凸轮
万方数据