High-pressure and ultra-high pressure injection pump plunger with annular groove

Abstract

A plunger of high pressure or super high pressure oil injection pump with ring slot is prepared as opening a ring slot on coordination surface of cylindrical column on said plunger and enabling to open multiple ring slot on coordination surface of cylindrical column on said plunger according to factors of plunger diameter, plunger stroke an plunger injection pressure.

Description

technical field [0001] The invention belongs to the scope of auto parts, in particular to a plunger of a high-pressure and ultra-high-pressure fuel injection pump with a ring groove used in an engine fuel injection system. technical background [0002] Today's automotive industry has higher and higher requirements for economy and emissions. In order to improve the economy and emissions of diesel engines, high-pressure and ultra-high-pressure fuel injection is the inevitable development direction of fuel injection systems. The injection pressure has now reached 180MPa above. With the increase of injection pressure, the problem of high pressure and ultra-high pressure leakage, especially the leakage of high pressure and ultra-high pressure on the mating surface of the plunger couple, restricts the realization of high pressure and ultra-high pressure of the injection system. Therefore, the high pressure and ultra-high pressure of the plunger couple Ultra-high pressure sealing ...

AI Technical Summary

Problems solved by technology

[0003] In the fuel injection pump of traditional diesel engine, the high-pressure plunger is a smooth shaft type without ring groove (as shown in Fig. Leakage requires high matching precision between the plunger 1 and the plunger sleeve or pump body 2, but the improvement of processing capacity and matching precision is limited; high-pressure leakage will cause the injection pressure or high-pressure duration to fail to reach Requirements, the engine combustion is insufficient, insufficient power, economical deterioration, emission deterioration such as: black smoke, excessive nitrogen oxides, etc.; manufacturing and matching accuracy is limited, therefore, the plunger is unbalanced by radial force during work , will generate lateral force, which will increase with the increase of oil supply pressure, which will easily cause the plunger to move stagnantly or even get stuck

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