Spherical-surface and tapered-surface combined opening and closing type common rail high-pressure oil injecting pump

Abstract

A spherical-surface and tapered-surface combined opening and closing type common rail high-pressure oil injecting pump comprises an oil pipe joint, an upper spring, an upper valve element, a lower spring, a lower valve element, a valve seat, a plunger piston and a pump body, wherein the upper valve element comprises an upper cylinder body, a sealing cone, a guide column and a spring seat hole; thesealing taper is in sealing fitting with the tapered surface of an upper end port of the valve seat; the valve seat is of an integrated structure and comprises a transverse oil inlet hole, a centraloil inlet hole, an oil storing chamber, a central oil outlet hole, a sealing tapered surface and a vertical oil inlet hole; the sealing tapered surface is arranged at the upper opening end of the central oil outlet hole; the transverse oil inlet hole communicates with the central oil inlet hole; the oil storing chamber communicates with a top clearance oil chamber through the vertical oil inlet hole; an oil inlet part is of an anti-rotation steel ball sealing structure; and an oil outlet part is of a guide tapered surface sealing structure. According to the spherical-surface and tapered-surface combined opening and closing type common rail high-pressure oil injecting pump, the valve seat which is of the integrated structure is capable of avoiding leaking; in addition, the pump is convenient to process and assemble; the fished product yield is high; and the service life is long.

Description

Technical field: [0001] The patent of the present invention relates to an electronically controlled common-rail fuel injection system for diesel engines, in particular to a high-pressure common-rail fuel injection pump. Background technique: [0002] With the implementation of high-standard emission requirements for diesel engines, the rail pressure requirements of high-pressure common rail systems have also increased. In order to meet the oil supply efficiency requirements of high-rail pressure pumps, the product must have extremely high requirements for sealing and fast oil intake. , high oil outlet pressure, fast response, long service life, high reliability, etc., and at the same time ensure low processing and assembly costs, and a high pass rate for one-time assembly of finished products. In the existing technology, the oil pumping components of the common rail fuel injection pump are such as figure 1 As shown in the figure, the control part adopts a split oil inlet an...

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Problems solved by technology

In the existing technology, the oil pumping components of the common rail fuel injection pump are such as figure 1 As shown in the figure, the control part adopts a split oil inlet and outlet valve structure. This split structure has poor sealing performance and low reliability, and the oil inlet and outlet are sealed with steel balls. In actual work, the steel ball and the corresponding The actual sealing surface between the sealing hole seat surface is not fixed, especially the high-pressure oil outlet control steel ball, there will be continuous impact between the steel ball and the sealing hole seat surface, so that the original sealing pair is damaged, and the sealing accuracy is difficult to guarantee stably. The upper split body assembly structure requires high machining accuracy, low machining efficiency, difficult assembly, and high risk of high pressure leakage

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