Fuel injection device

A fuel injection device, fuel technology, applied in the direction of fuel injection device, charging system, engine components, etc., can solve the problems of fuel pressure drop, fuel injection interruption, leakage, etc.

Active Publication Date: 2011-06-29
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the case of the injector of prior art 2, when the valve 121 of the electromagnetic control valve is opened, the fuel in the control chamber 104 will flow out from the outlet orifice 119, causing the fuel pressure in the control chamber 104 to drop, And a lot of high-pressure fuel will be discharged from the inlet orifice 118 to the low-pressure side due to the suction effect generated by the fuel flow rate flowing through the fuel discharge flow path 116, the so-called spray effect (or injector effect).
[0012] In addition, the injection water hammer (pressure fluctuation) caused by the valve opening of the needle 102 is applied to the intermediate valve 108 from the fuel supply chan

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] [Structure of Embodiment 1]

[0033] Figure 1 to Figure 3 Shown is embodiment 1 of the present invention, figure 1 is a diagram showing a common rail fuel injection device, figure 2 (a) is a figure showing the periphery of the orifice plate of the injector, figure 2 (b) is a figure which shows the cross groove formed in the stopper, image 3 It is a timing chart showing the working state of the injector.

[0034] The fuel supply device for the internal combustion engine of the present embodiment is assembled in the engine room of a vehicle such as an automobile, and is composed of a common rail type fuel injection system (accumulation type fuel injection system). This common rail type fuel injection system is used As a fuel injection system for internal combustion engines (engines) such as diesel engines with multiple cylinders.

[0035] The common rail fuel injection system includes: a transfer pump 1 that pressurizes the sucked fuel; a common rail 2 that intr...

Embodiment 2

[0177] Figure 4 (a) and Figure 4 (b) represents embodiment 2 of the present invention, Figure 4 (a) is a figure showing the periphery of the orifice plate of the injector, Figure 4 (b) is a figure which shows the cross groove formed in the stopper. here, Figure 4 (a) shows the status of the electromagnetic control valve closed, the check valve opened, and the needle 4 closed.

[0178] The check valve of this embodiment has: an orifice plate (valve body) 7 with a hollow portion (plug hole, pressure chamber 41) formed inside; a cylindrical valve plug (slide valve) 43 for switching on and off from the fuel supply flow The channel 16 introduces a gap (valve hole) 42 through which high-pressure fuel is introduced into the control chamber 12 via the fuel introduction channel 22;

[0179] The valve plug hole accommodates the valve plug 43 for opening and closing the gap 42 of the check valve, so that the valve plug 43 can move back and forth along the axial direction (movin...

Embodiment 3

[0189] Figure 5 Shown is Example 3 of the present invention, which is a view showing the peripheral portion of the orifice plate of the injector. here, Figure 5 It shows the state that the electromagnetic control valve is opened, the check valve is closed, and the needle 4 is opened, and the fuel is injected from the injection hole 3.

[0190] The check valve of this embodiment has: a valve body in which a hollow portion (plug hole, pressure chamber 41) is formed; The passage 22 introduces a gap (valve hole) 42 through which high-pressure fuel is introduced into the control chamber 12; and a spring 44 applies a biasing force to the valve plug 43 in the valve opening direction of the valve hole.

[0191] The valve body is composed of an orifice plate 7, an injector body 8, and the like.

[0192] The hollow portion is constituted by a recess (plug hole) opened on the second contact surface of the orifice plate 7 , a recess (pressure chamber 41 ) opened on the second connect...

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PUM

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Abstract

A fuel injection device is provided, wherein a fuel introducing flow path (22) for introducing high-pressure fuel into a control room (12) from a fuel supplying flow path (16), and a check valve for controlling the opening and the closing of a clearance (42) are formed inside an orifice plate (7). Therefore, the time (valve-opening response time) from the opening of a solenoid-controlled valve tothe opening of a needle (4) is shortened. In addition, the time (valve-closing response time) from the closing of the solenoid-controlled valve to the closing of the needle (4) is shortened. The closing of the needle (4) is accelerated, and the valve-closing responsiveness is improved. Additionally, in an injection period that the solenoid-controlled valve is opened, the check valve is closed andthe needle (4) is opened, the check valve closes the fuel introducing flow path (22) with a larger flow path section area, so abnormal injection actions such as the closing of the needle (4) can be prevented during the fuel injection into a combustion chamber of a cylinder of an engine.

Description

technical field [0001] The present invention relates to a fuel injection device for injecting fuel into a combustion chamber of an internal combustion engine, and in particular to a fuel injection device that uses at least two first and second control valves to control the fuel pressure in the control chamber, thereby improving the stability of the needle. A fuel injection device (injector) with valve opening responsiveness and needle closing responsiveness. Background technique [0002] In the past, such as Figure 10 with Figure 11 As shown, a known fuel injection device (injector of prior art 1) has the following components (for example, refer to Japanese Patent Application Laid-Open No. 09-032681): a needle 102 for switching to and from the combustion chamber of an internal combustion engine (engine) The nozzle hole 101 for injecting fuel; the nozzle chamber 103, the fuel pressure inside the nozzle chamber 102 applies the oil pressure (valve opening force: F1) to the n...

Claims

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Application Information

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IPC IPC(8): F02M47/02F02M61/10F02M61/20
Inventor 竹内久晴加藤正明足立尚史
Owner DENSO CORP
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