一、概况YN25型内燃凿岩机(见图1),是由天水风动工具研究所、天津内燃机研究所、宜春风动工具厂、洛阳风动工具厂、上海风动工具厂、西安筑路机械厂等单位组成的内燃凿岩机联合设计组所设计的一种新的凿岩机具。该机在宜春风动工具厂进行了样机试制;1978年5月完成了工业试验;同年9月 I. Overview YN25 internal combustion rock drill (see Figure 1), by the Tianshui pneumatic tools Institute, Tianjin Internal Combustion Engine Research Institute, Yichun pneumatic tools factory, Luoyang pneumatic tools factory, Shanghai pneumatic tools factory, Xi’an Road Machinery Plant And other units of internal combustion rock drilling joint design team designed a new type of rock drilling equipment. The aircraft in Yichun pneumatic tools factory prototype trial; 1978 May completed the industrial test; the same year in September