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Fuel injection valve

A fuel injection valve and fuel technology, applied in the directions of fuel injection device, injection device, charging system, etc., can solve the problem of inability to obtain fuel flow, unreasonable relative position relationship between valve seat hole and fuel injection hole, insufficient atomization, etc. problem, to achieve the effect of reducing exhaust emissions, stabilizing direction and shape, and preventing retention

Active Publication Date: 2006-11-15
HITACHI ASTEMO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, it can be clearly seen that in the conventional technology, the atomization of the injected fuel from the fuel injection hole is not sufficient, and the fuel flow rate cannot be obtained as planned. This is due to the size relationship between the length of the valve seat hole and the height of the fuel diffusion chamber. , The relative positional relationship between the valve seat hole and the fuel injection hole is unreasonable.

Method used

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  • Fuel injection valve
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  • Fuel injection valve

Examples

Experimental program
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Effect test

Embodiment 1

[0037] exist figure 1 Among them, the housing 1 of the electromagnetic fuel injection valve 1 for an internal combustion engine is composed of the following components: a cylindrical valve housing 2 (magnetic body); The valve seat member 3; the cylindrical fixed core 5 that is liquid-tightly combined with the rear end of the valve housing 2 via an annular spacer 4.

[0038] The spacer 4 is made of non-magnetic metal, such as stainless steel. The valve casing 2 and the fixed iron core 5 abut against the two ends thereof, and are welded together in a liquid-tight manner along the entire circumference.

[0039] A first fitting cylindrical portion 3 a and a second fitting cylindrical portion 2 a are respectively formed at opposing end portions of the valve seat member 3 and the valve housing 2 . Furthermore, the first fitting cylindrical portion 3 a is pressed into the second fitting cylindrical portion 2 a together with the baffle 6 , and the baffle 6 is sandwiched between the v...

Embodiment 2

[0070] In this second embodiment, on the top surface of the fuel diffusion chamber 43, one or more stages of annular steps 43a concentric with the valve seat hole 7 are formed, whereby the height t1 of the fuel diffusion chamber 43 increases as the fuel diffusion chamber increases. The central portion of the diffusion chamber 43 gradually decreases toward the radially outward. The above-mentioned step portion 43a is formed in a cone shape or an arc shape so as not to hinder fuel diffusion. In addition, a tapered or arcuate chamfer 42 ′ is provided at an annular corner portion connecting the bottom surface of the fuel collection chamber 41 and the inner peripheral surface of the valve seat hole 7 .

[0071] Other constitutions are identical with above-mentioned embodiment, therefore, in Figure 4 In , the parts corresponding to the above-mentioned embodiments are assigned the same reference numerals, and their descriptions are omitted.

[0072] According to the second embodim...

Embodiment 3

[0075] In the third embodiment, an intermediate plate 50 having an opening 50 a corresponding to the fuel diffusion chamber 43 is joined between the valve seat member 3 and the injection plate 10 . Other constitutions are identical with above-mentioned embodiment, therefore, in Figure 5 In , the parts corresponding to the above-mentioned embodiments are assigned the same reference numerals, and their descriptions are omitted.

[0076] According to the third embodiment, the fuel diffusion chamber 43 can be easily formed by pressing the intermediate plate 50 .

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Abstract

A fuel injection valve where a conical valve seat (8) and a valve seat hole (7) continues to the downstream end of the valve seat (8) is provided in a valve seat member (3), a flat fuel diffusion chamber (43) radially expanding from the valve seat hole (7) is formed between the valve seat member (3) and an injector plate (10), and fuel injection holes (11) opened to the fuel diffusion chamber (43) are provided in the injector plate (10). The fuel injection holes (11) are arranged to be separated radially outward from the valve seat hole (7) and at the same time to satisfy t2 / t1 >= 2, with t1 the height of the fuel diffusion chamber (43) and t2 the length of the valve seat hole (7). This reasonably sets a magnitude relationship between the length of the valve seat hole and the height of the fuel diffusion chamber and sets also a relative positional relationship between the valve seat hole and the fuel injection holes. As a result, injected fuel is effectively atomized.

Description

technical field [0001] The present invention mainly relates to a fuel injection valve used in a fuel supply system of an internal combustion engine, and in particular to an improvement of a fuel injection valve provided with a conical valve seat member cooperating with a valve portion of a valve assembly. The valve seat and the valve seat hole connected to the downstream end of the valve seat. In addition, between the above-mentioned valve seat member and the injection plate joined to it, there is formed a A flat fuel diffusion chamber expanding in direction, and a plurality of fuel injection holes opening to the fuel diffusion chamber are perforated on the injection plate. Background technique [0002] Such a fuel injection valve for an internal combustion engine is known as disclosed in Patent Document 1 below. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2000-97129 [0004] The purpose of this type of fuel injection valve for an internal combustion engine i...

Claims

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Application Information

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IPC IPC(8): F02M61/18F02M51/06F02M51/08
CPCF02M51/0682F02M61/18F02M61/1853F02M61/188Y10S239/90
Inventor 松本英史北村浩二佐藤岳
Owner HITACHI ASTEMO LTD
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