First, the role of 1. Increase the hydraulic pressure (constant pressure): the injection pressure to 10MPa ~ 20MPa. 2. Control injection time (timing): according to the time required to inject and stop fuel injection. 3. Control of fuel injection (quantitative): According to the work of the diesel engine, change the amount of fuel injection to regulate the speed and power of diesel engine. Second, the injection pump requirements 1. According to the order of diesel engine oil supply, and the amount of fuel supply for each cylinder. 2. The fuel tank advance angle to be the same. 3. The cylinder oil supply to extend the same time. 4. The establishment of oil pressure and the stop of oil supply must be prompt to prevent the occurrence of dripping. Third, the classification of fuel pump 1. Plunger injection pump. 2. Pump - injector type, the fuel injection pump and injector together. 3. Rotor distributor injection pump. Fourth, the typical configuration of injection pump Diesel injection pump commonly used in our country are: A-type pump, B-type pump, P-type pump, VE-type pump. The first three types are piston pump; VE pump distributed rotor pump. (A) B-type fuel injection pump structural features 1. Spiral groove plunger and flat bore plunger sleeve; 2. The oil regulating mechanism is a toothed rod type, and the adjustable maximum oil amount rigid limiter (some uses a spring stopper) is arranged on the front end of the toothed rod; Adjust the screw roller body transmission components; 3. The camshafts are tangent cams and are supported on the housing with tapered roller bearings. 4. The pump body as a whole, the use of independent lubrication. (B) P-type injection pump structural features 1. Suspension-type pump assembly plunger and plunger sleeve, the valve and other parts with a flanged wheel cylinder steel sleeve fitted together into an assembly. With pressure studs directly fixed in the shell, forming a hanging structure. Sleeve can be rotated a certain angle. 2. The adjustment of the amount of oil for the sub-pump Cylinder flange on the wheel cylinder with arc groove, release the compression studs, rotating steel sleeve, the sub-pump plunger sleeve that is with its rotation angle, change Back to the oil hole relative to the chute on the plunger position, back to the oil that is changing. 3. Adjusting the starting point of the sub-pump oil increase or decrease under the flange disk sleeve gasket, the plunger sleeve back and forth slightly trace the amount of vertical movement, thereby changing the position relative to the upper end of the plunger can be adjusted Starting point for oil. 4. Ball angle plate type oil volume adjustment mechanism in the transmission sleeve end face welded 1 to 2 balls, oil rod cross-section was an angle steel, at the level of its right-angle edge of a small square notch, the working groove Engage with the ball on the drive sleeve. Non-adjustable wheel body transmission parts; Fully enclosed box pump body without using the side of the integral sealed pump body, only the upper and lower cover. Pump body stiffness, can withstand higher injection pressure without deformation, so that the life of the plunger coupling longer; 6. Using a pressure lubrication; 7. A dedicated inspection of the preparation of the trip hole in the wheel body has a screw plug, the hole can be used to check the preparation of a sub-stroke travel is consistent (with a special instrument measurements).
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