压缩天然气单燃料发动机气门座圈材料的性能分析  

Performance Analysis of Compressed Natural Gas Single-fuel Engine Valve Seat Materials

作　　者：彭雪飞[1] 王云鹏[1] 隗海林[1] 李世武[1] 

机构地区：[1]吉林大学交通学院

出　　处：《上海交通大学学报》2008年第8期1392-1395,共4页Journal of Shanghai Jiaotong University

摘　　要：针对压缩天然气(CNG)单燃料发动机在耐久性试验后气门座圈失效所造成的气门下沉量及气缸压缩压力降幅过大问题,设计了适用于CNG单燃料发动机的新气门座圈材料.将新材料气门座圈安装在发动机的第2、4缸,而第1、3缸气门座圈采用原材质不变,进行450 h耐久性试验,测量各缸的压缩压力和气门下沉量,并对发动机的气门座圈失效原因进行分析.试验结果表明:所设计的气门座圈可以满足CNG单燃料发动机的使用要求.发动机的气门座圈的失效机制为高温高压燃气环境中因高速、高温和反复冲击所引起的气门与座圈的磨损与腐蚀.On the basis of analyzing the invalidation reasons of the valve seat, the classification of the powder metallurgy valve seat and the rules of choosing materials, this paper designed a new kind of materials of valve seat for CNG （compressed natural gas） single-fuel engine. This new materials valve seat will be installed on the second and fourth cylinder of the test engine, and the valve seat on the first and third cylinder using the original materials remains unchanged. The cylinder pressure and valve＇s sinkage value were measured after 450 h durability test. The contrast test indicates that this new kind of material can meet the needs of CNG single-fuel engine.

关 键 词：压缩天然气发动机 气门座圈材料 耐久性试验 

分 类 号：U464.131[机械工程—车辆工程]