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小型拖拉机上的柴油机多为手摇起动,通过摇把将力传给曲轴,克服活塞的运动阻力,使柴油机起动。当活塞运行到压缩上止点时,气缸内的可燃混合气将要着火爆发的瞬间,活塞的运动阻力最大。在起动过程中,如果在活塞到压缩上止点时,摇把处于人手最能使劲的位置,发动机就最容易起动。实践证明,当摇把处于水平位置,且由下向上运动时,人手最能使上劲。由上分析可知,当摇转曲轴,活塞到上止点时,摇把应处于水平位置,且由下向上运动。
Diesel on small tractors for hand cranking, the crank by the force transmitted to the crankshaft to overcome the resistance of the piston movement, the diesel engine start. When the piston runs to the compression top dead center, the combustible mixture in the cylinder will be ignited at the instant of ignition, and the piston has the greatest movement resistance. In the starting process, if the piston to compression top dead center, the hand crank in the most capable position, the engine is the easiest start. Practice has proved that when the rocker in a horizontal position, and from the bottom up exercise, the staff can make the best. From the above analysis shows that when cranking the crankshaft, the piston to the top dead center, the crank should be at a horizontal position, and from the bottom up.