一、排气阀的损坏及解决措施 内燃机排气阀长期处在高温燃气腐蚀介质和机械疲劳应力、热应力联合作用下工作,其损坏形式主要是在阀面上产生许多局部分散的浸蚀凹坑,称之为“麻坑”。在国产内燃机中,麻坑的存在并不因气阀钢种和机型而异,麻坑是排气阀上一种普遍的金属表层疲劳破坏形式。它的出现导致密封不良,功率下降,而使气阀工作过早失效。 First, the exhaust valve damage and solutions Internal combustion engine exhaust valve long-term high temperature gas corrosion medium and mechanical fatigue stress, thermal stress work under the joint effect of its damage mainly in the valve surface to produce a number of locally dispersed erosion concave Pit, called “Ma Hang.” In the domestic internal combustion engine, the existence of Ma Hang is not due to the valve steel species and models vary, Ma Hang exhaust valve is a common form of metal surface fatigue damage. Its appearance leads to poor sealing, power down, leaving valve work premature failure.