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fuel injector

A technology for fuel injectors and fuel sprays, applied in fuel injection devices, charging systems, machines/engines, etc., can solve problems such as adhesion to the inner wall surface, and achieve the effect of suppressing gap filling and instability

Active Publication Date: 2018-09-25
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fuel may adhere to inner wall surfaces

Method used

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Examples

Experimental program
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Effect test

no. 1 example

[0019] refer to Figure 1 to Figure 4 , the fuel injector 1 of the first embodiment will be described below.

[0020] The fuel injector 1 has a nozzle body 2 , a nozzle needle 3 and a pressure control part 10 . The pressure control part 10 controls the pressure in the pressure chamber 5 defined between the nozzle body 2 and the nozzle needle 3 so that the nozzle needle 3 moves up and down.

[0021] The nozzle body 2 is cylindrical and made of ferrous material. The nozzle body 2 defines a space therein. The nozzle needle 3 is accommodated in the space. A pressure chamber 5 is defined between the nozzle needle 3 and the nozzle body 2 . The pressure control portion is arranged at the base end of the nozzle body 2 . A pocket 21 is formed at the tip of the nozzle body 2 . The pocket 21 has an injection channel 4 that communicates the pressure chamber 5 with a combustion chamber (not shown) of the internal combustion engine. The nozzle body 2 has a seat portion 21 into which ...

no. 2 example

[0048] A second embodiment will be described below. In the second embodiment, as Figure 6 As shown, the configuration of the nozzle hole 43 is different from that of the first embodiment. Figure 6 is a schematic diagram illustrating the injection channel 4 .

[0049] The inner diameter of the nozzle hole inlet 411 is larger than the inner diameter of the nozzle hole outlet 412 . The inner diameter of the nozzle hole 43 gradually decreases from the nozzle hole inlet 411 toward the nozzle hole outlet 412 . The vertical distance “R”, the axial distance “L”, and the injection angle θ2 are defined to satisfy the following formula: R / (L×tan θ2 )>6.

[0050] Backlash in the ejection passage 4 can be suppressed. Instability of the fuel spray shape can be suppressed.

[0051] Also, since the inner diameter of the nozzle hole 43 gradually increases from the nozzle hole inlet 411 toward the nozzle hole outlet 412 , the flow speed of fuel increases in the injection passage 4 . Thu...

no. 3 example

[0053] A third embodiment will be described below. In the third embodiment, such as Figure 7 As shown, the configuration of the counterbore 44 differs from the first embodiment. Figure 7 is a schematic diagram illustrating the injection channel 4 .

[0054] The axial centerline AX2 of the counterbore 44 is offset from the axial centerline AX1 of the nozzle hole 44 . Because the centerline of the fuel spray is offset from the centerline of the counterbore 44 , the outer diameter of the fuel spray is different from the inner diameter of the counterbore 44 . A contact point 423 exists on the inner wall 422 of the counterbore 44 . Backlash in the injection passage 4 can be suppressed and instability of the fuel spray shape can be suppressed.

[0055] (other embodiments)

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Abstract

The fuel injector has a cylindrical nozzle body (2), a nozzle needle (3), a pressure chamber (5) and an injection channel (4). The injection channel (4) includes a first hole (41) and a second hole (42). The minimum vertical distance between the periphery ( 413 ) of the first nozzle hole outlet ( 412 ) and the contact point ( 423 ) with respect to the axial centerline ( AX1 ) of the first hole ( 41 ) is defined as the vertical distance R. The axial distance L is defined as the minimum axial distance between the first nozzle hole outlet ( 412 ) and the contact point ( 423 ) with respect to the axial centerline ( AX1 ) of the first hole ( 41 ). The angle between the axial centerline (AX1) of the first nozzle hole (41) and the outer peripheral line (Se1) of the fuel spray is defined as the injection angle θ. The vertical distance R, the axial distance L and the injection angle θ satisfy the formula: R / (L×tanθ)>6.0.

Description

technical field [0001] The invention relates to a fuel injector for injecting fuel into cylinders of an internal combustion engine. Background technique [0002] JP2006-510849A (US2006-0226263A1, DE10325289A1, CN1798920A) discloses a fuel injector, especially a fuel injector for directly injecting fuel into a combustion chamber of an internal combustion engine. The fuel injector has a valve closure element that cooperates with a valve seat surface formed on the valve seat body to form a sealed valve seat. The fuel injector includes at least one spray discharge orifice disposed downstream of the sealing valve seat. The spray discharge orifice has a guide region and a discharge region arranged at its discharge-side end. From the transition from the guide region to the discharge region, the discharge region widens in a step-like manner and / or at least partially continuously by at least one first step. The fuel jet emerging from the guide region at the transition and widening...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M61/18F02M61/10
CPCF02M61/1833F02M61/1846F02M51/061F02M61/04F02M61/18
Inventor 芹泽一史宇都宫敦司藤挂文裕有川文明桥本雄太
Owner DENSO CORP