由于135系列柴油机转速和功率的不断提高,原气门挺柱(50Mn2钢)的异常磨损加剧,己不能适应产品发展的需要,因此必须在材料、工艺、结构设计等方面进行改进。通过试验验证,找出可行方案。采用表面处理的激冷合金铸铁挺柱与球化耐磨铸铁凸轮配对,经500小时热冲击和2000小时耐久试验,通过两年来三千多台柴油机批量考核,达到了预期的改进目标。 Due to the continuous improvement of the speed and power of the 135 series diesel engine, the abnormal wear and tear of the original valve lifter (50Mn2 steel) has been aggravated and has not been able to meet the needs of product development. Therefore, improvements must be made in material, process and structural design. Through experimental verification, find out the feasible plan. The chilled alloy cast iron tappet with surface treatment is paired with a ball-shaped wear-resistant cast iron cam. After 500 hours thermal shock and 2000 hours endurance test, it achieved the expected improvement goal through more than 3,000 diesel engine batch tests over the past two years.