High pressure common rail fuel metering valve

Abstract

The invention discloses a high pressure common rail fuel metering valve, which comprises an electromagnetic operating component and a regulating valve driven by the electromagnetic operating component, wherein the regulating valve comprises a valve shell and a valve piston; the pipe wall of the valve shell is provided with opposite radial orifices which penetrate through an inner cavity; the lower end of the valve shell is provided with a spring seat which is provided with a flow port; the valve piston is columnar, and the outer circumference of the valve piston is provided with radial annular grooves matched with the radial orifices to change an open area; and the valve piston is axially provided with flow circular holes communicated with the radial annular grooves. According to the high pressure common rail fuel metering valve, the radial annular grooves matched with the radial orifices to change the fuel inlet sectional area are machined on the outer circumference of the columnar valve piston, the machining process is simple, and the machining difficulty and cost are reduced; and in addition, compared with the conventional tubular valve piston, the columnar valve piston has the advantages of improving structural strength and reducing machining difficulty and cost.

Description

technical field [0001] The invention relates to the field of engines, in particular to a high-pressure common rail fuel metering valve. Background technique [0002] The fuel metering valve is installed at the oil inlet position of the high-pressure oil pump, and is used to adjust the fuel supply and fuel pressure value, and its adjustment requirements are controlled by the ECU. quantity. [0003] The fuel metering valve includes: an electromagnetic operating assembly and a regulating valve driven by the electromagnetic operating assembly. The valve casing of the regulating valve has a ring channel, and an inflow hole communicating with it is opened on the ring channel. The valve piston is tubular. The inner cavity is filled with oil, and its circumference is provided with an orifice connected with the inner cavity. This structure enables the fuel to be output from the outlet of the front-stage delivery pump of the system, through the inflow hole and ring channel on the val...

AI Technical Summary

Problems solved by technology

[0004] However, the ring channel on the valve housing belongs to the inner ring channel, and the processing technology is complicated; the valve piston is tubular, and because the tube wall is thin, the upper throttle hole, the processing technology is complicated and difficult to control; in addition, when the valve piston is in the electromagnetic operation assembly Driven to move to a certain axial position in the valve housing, when the valve core rotates in the valve housing, the corresponding position of the throttle hole of the valve piston and the inflow hole of the valve housing directly affects the fuel throughput in the throttle hole ( When the orifice is facing the inflow hole of the valve housing, the fuel flux generated by the orifice is the largest, and the fuel circulation buffer force is small), which makes the fuel flow in the orifice unstable, and the fuel flow cannot always be effective ground buffer

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