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东风—50型拖拉机在田问作业中,当驾驶员突然收油门时,往往会出现缺缸甚至熄火现象。这时拆下喷油泵盖板后,便可发现有的柱塞调节臂脱出拉杆调节块,且总是在停油位置上出现。导致上述故障的原因有二: 1.根本原因拉杆和拉杆衬套磨损后,配合间隙增大,从而使拉杆调节块的转动量(以拉杆轴心为圆心的圆周运动)亦增大。因为拉杆和拉杆衬套的断面呈D型,加之拉杆上的四个调节块的重心又偏向柱塞一边,这样,就使拉杆和拉杆衬套受力不匀,于是,D型断面的左上角磨损得较其它部位严重,因而有使拉杆调节块离开柱塞中心转动的趋势。当拉杆和拉杆衬套的间隙达到0.70～0.90毫米(相当于拉杆调节块转动14°～15°)时,拉杆恰好处于停油极限位置,故柱塞在下止点时就极易脱出。 2.操作上的原因驾驶员在驾机作业中,由于突然
Dongfeng-50 tractor in field operations, when the driver suddenly close the throttle, there will often be missing cylinder or flameout phenomenon. Then remove the fuel injection pump cover, you can find some of the plunger arm release lever adjustment block, and always appear in the stop position. There are two reasons for the above failure: 1. Root cause The wear of the tie rod and tie rod bushing increases with the increase of the clearance so that the amount of rotation of the tie rod adjusting block (circular motion with the rod axis as the center) increases. Because the rod and rod bush section is D-shaped, combined with the center of gravity of the four adjustment block on the rod is biased to the side of the plunger, so that the rod and rod bushing force uneven, so, D-shaped section of the upper left corner Wear more serious than the other parts, so there is a lever to adjust the block away from the center of the plunger rotation tendency. When the lever and the rod bushing clearance reaches 0.70 ~ 0.90 mm (equivalent to the rod adjustment block rotation 14 ° ~ 15 °), the rod just in the oil stop limit position, so the piston at the bottom dead center can easily emerge. 2. Operational reasons drivers in the driving operation, due to sudden