压缩余隙(俗称存气间隙)是指活塞处于压缩上止点时,活塞顶与气缸盖之间的间隙。这是一个既重要而又被忽视了的技术参数。说它重要,是因为它关系到柴油机的动力性和经济性,甚至影响到发动机能否正常工作。因为压缩余隙的增大,使气缸燃烧室容积增大,压缩比降低,气缸内压力下降,使喷入气缸内的雾化燃油不能充分燃烧,发动机功率下降,耗油率增大,当压缩余隙增大到一定值时,发动机就不能正常起动。我们说压缩余隙是被忽视的技术参数,是因为几乎所有的柴油机、拖拉机使用说明书及有关修理资料中,很难找到它的位置。影响压缩余隙的因素很多,首 Compressed clearance (commonly known as the air gap) refers to the piston in the compression top dead center, the top of the piston and the gap between the cylinder head. This is an important and overlooked technical parameters. It is important because it relates to the dynamics and economy of diesel engines and even affects the ability of the engine to work properly. Because the compression clearance increases, the cylinder chamber volume increases, the compression ratio decreases, the cylinder pressure drops so that the atomized fuel injected into the cylinder can not be fully burned, the engine power down, fuel consumption increases, when the compression When the clearance increases to a certain value, the engine can not start normally. We say compression clearance is neglected technical parameters, because almost all of diesel engines, tractors and related repair information, it is difficult to find its location. Many factors affect the compression gap, first