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造成活塞顶撞气门的主要原因是配气相位偏差太大。在装配正时齿轮时,如果凸轮轴齿轮往早赶牙太多(凸轮轴顺时针转动),会使进气门过早开启;如果凸轮轴齿轮往晚赶牙太多(凸轮轴逆时针转动),会使排气门过晚开启。以上都会导致活塞达到排气上止点时,造成活塞与气门顶撞的事故。当活塞与气门顶撞时,摇臂、摇臂轴、推杆、挺杆等机件将承受很大的冲击力,从而产生不同程度的损坏。由于各型柴油机在结构上有所不同,易造成损坏的机件也不相同。上海-50型拖拉机由于挺杆短,强度大,而且没有推杆,因此容易顶坏摇臂。E512联合收割机的发动机,由于其挺杆较单薄、推杆较长,因此易顶坏挺杆,同时推杆
The main reason for causing the piston to hit the valve is that the valve phase deviation is too large. When assembling a timing gear, if the camshaft gear hits too early (the camshaft rotates clockwise), the inlet valve will prematurely open; if the camshaft gear hits too late (the camshaft rotates counterclockwise ), The exhaust valve will open too late. All of the above will cause the piston to reach the exhaust top dead center, causing the piston and the valve to collide with the accident. When the piston and the valve hit the rocker, rocker shaft, putter, tappet and other parts will bear a great impact, resulting in varying degrees of damage. As each type of diesel engine is different in structure, easy to damage the parts are not the same. Shanghai -50 tractor because the tappet is short, strong, and there is no putter, it is easy to top bad rocker arm. E512 combine harvester engine, due to its tappet thinner, putter longer, so easy to top bad tappet, while the putter