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Recently, the TY120-type bulldozers, ZL series loaders, PY160 grader, and 75kW mobile power plants and other construction machinery used by the military units mostly used the 6135 diesel engine as the mechanical power unit. The diesel engine B-type fuel pump equipment training and engineering operations in the process of camshaft often broken, seriously affecting the successful completion of training and construction tasks. Combined with teaching and repair equipment practice, the reasons for the camshaft fracture of diesel injection pump, emergency repair methods and preventive measures are introduced. 1, the reason analysis Diesel engine B-type pump for the overall plunger pump, fixed by four bolts on the side of the frame of the diesel engine by the diesel engine crankshaft driven by the timing gear, injection pump camshaft and pump drive shaft Shaft connection. The lift of the injection pump cam is 10mm, the center distance of the minute pump is 40mm, and the highest speed of the pump reaches 1000r / min. Due to the high rotational speed of the injection pump and the installation form of "4 o'clock support", as well as improper use and maintenance, etc., the arc surface of the pump body at the joint of the fuel injection pump and the support frame is caused to wear (the abrasion on the arc surface of the support frame is relatively small) Body down, so that the axis of the camshaft and pump drive shaft offset. Fuel injection pump camshaft torsion, bending and swinging and other forces generated additional alternating stress, eventually leading to camshaft fatigue fracture. 2, emergency repair methods B-type injection pump camshaft journal surface roughness 3.2 △, hardness not less than HRC45, cylindrical tolerance of 0.10mm, full-length straightness tolerance of 0.05mm, are precision parts. After the camshaft rupture, the general method of replacement, but replacement parts if not ruled out the root causes of camshaft rupture, will inevitably lead to rupture again. In order to avoid repeated fracture of the camshaft, usually need to replace the B-type pump body or B-type injection pump assembly, this approach is neither economical nor difficult to guarantee (replacement B type pump body pump test bench required Test). After many years of practice, the following three kinds of emergency methods are more suitable for the B-type fuel injection camshaft fracture repair. (1) Original repair method. Causing the root cause of camshaft fracture is the pump pump wear, so you can take the welding welding, brazing "heap fill" method. Heap thickness and the area should be slightly larger than the wear and tear, after welding using the method of cutting and grinding the welding parts polished flat, restore the original pump geometry, cleaning the various parts, installed after commissioning can be used. The original repair method can also use metal glue make up method, repair the pump body pump. That is, the prepared metal glue is coated on the wear area, the thickness and area of ​​the coating is slightly larger than the wear amount, after the metal glue is solidified for 20-30min, the area coated with the metal glue is polished and cleaned, the parts are installed, be usable. (2) parts demolition spell. B-type fuel pump pump body material is generally cast iron or aluminum alloy, although the material is different, but its installation size and internal structure exactly the same. Therefore, B-type fuel pump has been scrapped, according to the need to disassemble available pump body, camshaft and other parts, assembled into a complete B-type fuel pump, installed after debugging qualified use. (3) Additional Parts Act. In the inability to use the "original repair law" and "Splitting Law", you can use the "additional parts law." The specific method is: ①with a knife and grinding abrasive cloth to wear and tear parts of the pump grinding (wear parts with the bracket with the surface, and by the end of the pump drive shaft is more serious); ② with a deep caliper after abrasion measured by the pump The depth of the site, the wear depth is generally between 0.5-1mm; ③ with copper or iron pieces made of additional parts (pads), the thickness of the measured wear depth determined by the site, the width is about equal to the thickness of the stent, the length is about equal to The arc length of the wear part of the pump body; ④ will make a good gasket attached to the bracket and the wear parts of the pump body, the number of gaskets measured according to the depth of wear parts determined, generally not more than 3; ⑤ installation and adjustment Start testing, delivery. 3, precautionary measures B type diesel engine fuel pump pump body wear is mainly caused by the relative looseness of the pump body and the bracket, so from the following three aspects to be prevented. (1) the installation should be correct. B-type diesel engine fuel injection pump often due to uneven fuel supply for each cylinder, fuel supply interval angle is not allowed for the reasons for the overall removal and repair, the whole pump after the installation. Installation should pay attention to the following points: ①fixed bolt diagonal tight. If the first tight side or outside the body by the side of the two bolts, on the one hand may result in a good adjustment of the fuel supply advance angle is damaged (first tight by the body side of the two fixed bolts advance advance angle; tight Set the outer two fixed bolts, oil advance angle postponed ahead of schedule), on the other hand may cause the fuel injection pump camshaft axis and the pump drive shaft axis has been offset in the installation, the engine starts, the camshaft directly subject to additional changes Stress and fatigue fracture. ② fixed bolts should be sub-2-3 times tight. ③ The tightening torque of the fixing bolt should be between 15-25N (the fixing bolt is M8 × 1 or M10 × 1 fine thread, the tightening torque is too big and the thread is damaged easily). ④ fixing bolts should be firmly in place. In practice, it often happens that the two fixing bolts close to the side of the machine body are not tightly fastened due to the limitation of the installation position, while the two fixing bolts on the outer side are over-tightly fastened. (2) Maintenance should be appropriate. B-type diesel engine fuel injection pump diesel engine fuel supply system is an important component in the use of the maintenance process in the following three points: ①oil pump quantity and quality to meet the requirements. Such as poor lubrication, ranging from the pump drive components early wear and tear, heavy bearing stuck, resulting in camshaft twist. ② camshaft axial clearance should be appropriate. Camshaft axial clearance is generally about 0.03-0.15mm, the gap is too large, faster wear and tear of the camshaft, the engine is not running smoothly, causing the pump early wear and tear. ③ fuel pump advance angle and the cylinder oil supply interval angle to meet the requirements. If the fuel supply advance angle and the interval between each cylinder oil supply do not meet the requirements, not only will the engine power, economic deterioration, but also cause engine starting difficulties, unstable operation, leading to pump wear and tear faster. (3) check in time. B-type diesel engine fuel pump pump and bracket loose situation, the general should be checked during the week maintenance. If you find the engine has abnormal conditions or loose body, should be promptly checked tight. Check the tight method according to the installation requirements.