Split control valve of common rail oil injector

Abstract

The invention provides a split control valve of a common rail oil injector and aims at realizing domestication of the critical part control valve of the oil injector and reducing the manufacturing difficulty. The split control valve of the common rail oil injector comprises an armature, a control rod, a valve body and a valve seat; a groove is formed in the lower end face of the valve body; the central axis of the groove is coincident with that of the valve body; the contour of the groove is united with the outer contour so that, after the valve seat is inserted in the groove, the outer contour of the valve seat is closely fitted with the inner wall of the groove and the lower end face of the valve seat is flush with the lower end face of the valve body; a guide hole, an oil holding groove and an oil outlet orifice, all of which are communicated with each other, are orderly formed in the integrated structure formed by the valve seat and the valve body; the starting end of the guide hole is located on the upper end face of the valve body, while the tail end of the oil outlet orifice is located on the lower end face of the valve seat; an oil drain hole communicated with the oil holding groove is formed in the outer sidewall of the valve seat; the control rod is inserted in the guide hole and the oil inserting groove. The valve seat is embedded in the valve body and the valve body is separated from the valve seat to guarantee the operability of machining, and therefore, the production cost is reduced and the rejection rate of products is reduced.

Description

technical field [0001] The invention relates to a control ball valve of a common rail fuel injector of a common rail fuel injection system of a diesel engine, and belongs to the field of electronically controlled fuel oil systems. technical background [0002] figure 1 It is a simplified structural diagram of the existing common rail injector control ball valve, which consists of an armature 1, a control valve stem 2, a valve body 3, a ball seat 4, a steel ball 5 and a valve seat 6, and the valve seat 6 is processed with an oil inlet System hole 7 and oil outlet orifice 8 and high-precision conical surface 9, positioning pin 10, oil tank 3-4, oil drain hole 3-5. The positioning pin 10 is used for positioning with the fuel injector body, so that the oil inlet orifice 7 is connected with the high-pressure oil passage. [0003] Since the control valve controls high-pressure fuel oil up to 160-220MPa, the valve body 3, the control valve stem 2, and the cone surface 9 are all h...

AI Technical Summary

Problems solved by technology

[0003] Since the control valve controls high-pressure fuel oil up to 160-220MPa, the valve body 3, the control valve stem 2, and the cone surface 9 are all high-precision parts, and the upper and lower end surfaces of the valve seat 6 are required to be sealed, and the upper end surface is a high-precision surface, and the processing requirements are very high. High, it is necessary to ensure that the parallelism of the upper and lower end surfaces of the valve seat 6 is 0.005mm, the flatness is 0.0009mm, and the roughness is Ra0.05. According to this process standard, domestically processed parts have high cost and low pass rate, and the fuel injector is After disassembly, the high-precision surface of the upper end of the valve seat 6 must be reworked before assembly

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