High flow rate fuel valve and fuel supply pump with the valve

Abstract

A high flow rate fuel valve suitable for an accumulator fuel injection device by which a large amount of fuel is amplified using a piston and used and a fuel supply pump using the high flow rate fuel valve are provided. For this purpose, in a fuel supply pump with a fuel inlet valve and fuel outlet valve, the fuel inlet valve has a valve main body, a valve body received in the valve main body, an inlet chamber provided inside the valve main body, inlet holes, a seat portion where the valve body and part of valve main body are in contact with each other. The inlet holes are arranged in a non-radial pattern relative to the inlet chamber.

Description

TECHNICAL FIELD [0001] The present invention relates to a high flow rate fuel valve and a fuel supply pump with the valve. Particularly, the present invention relates to a high flow rate fuel valve suitable for a fuel supply pump used in an accumulator fuel injection device (APCRS: Amplified Piston Common Rail System) that amplifies the pressure of a large flow rate of fuel through the use of a pressure piston, and a fuel supply pump with the valve. BACKGROUNDS [0002] Conventionally, various accumulator fuel injection devices (CRSs: Common Rail Systems) using pressure accumulators (common rails) have been proposed in order to inject high-pressure fuels efficiently in diesel engines and so on. [0003] For instance, as shown in FIG. 20, for switching the pressures of a pressure accumulator depending on the driving conditions of an engine, JP 06-93936 A has proposed an accumulator fuel injection device having a first pressure accumulator 236 responsible for a main injection and a second...

AI Technical Summary

Benefits of technology

[0013] That is, as constituted above, the fuel can be introduced into the inlet chamber through a plurality of the inlet holes arranged in a non-radical pattern without substantially altering the direction of fuel flow. Even though the streams of fuel are introduced from plural directions, their mutual collisions in the inlet chamber can be lessened. Therefore, fuel, even in an extremely large amount, can be passed quickly and quantitatively through the high flow fuel valve.

[0027] Using such an accumulator fuel injection device, a large amount of fuel can be easily pressurized. Therefore, the combustion efficiency in the fuel injection system can be raised. Also, the generation of erosion can be easily prevented, while the durability can be increased.

Problems solved by technology

Therefore, there is a problem in that the accumulator fuel injection device is complicated and grown in size.

In the accumulator fuel injection device, furthermore, there is an another problem in that a large amount of fuel cannot be pressurized sufficiently because the fuel is difficult to flow quickly to the fuel injection valve when the cam and plunger of the fuel supply pump are driven at high speed.

As the flow rate of fuel is restricted, a large amount of fuel cannot be pressurized sufficiently.

Any fuel injection valve adapted for the pressure pump, which intends to supply a large amount of high-pressure fuel, is not designed.

Furthermore, the fuel injection valves disclosed in JP 06-101597 A and JP 10-47208 A are difficult to be used as high flow fuel valves because their structures differ fundamentally from the high flow fuel valves in that the proportion of the length of an injection hole to the diameter of the injection hole is restricted within a predetermined range, a revolving body is installed, and so on.

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