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Injector

A technology of injectors and injection valves, which is applied to fuel injection devices, special fuel injection devices, machines/engines, etc., and can solve problems such as high-pressure fuel leakage

Inactive Publication Date: 2006-07-05
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, raising the pressure to 200MPA or higher creates a problem that high-pressure fuel leaks outward from the high-pressure fuel hole 46A.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] (Structure of Example 1)

[0025] FIG. 1A shows an electromagnetic control type fuel injection valve 1 for intermittently injecting fuel into a combustion chamber of an engine, and FIG. 1B shows a metal sealing structure of a main part of the fuel injection valve 1 .

[0026] The fuel injection valve 1 is used in an accumulator type (common rail type) fuel injection device of a diesel engine and injects high-pressure fuel input from a common rail (not shown) to a combustion chamber of the engine.

[0027] The fuel injection valve 1 includes an injection valve body 2 , a solenoid valve 3 (corresponding to a driving device and including a piezoelectric type) connected to the upper end of the injection valve body 2 , and a nozzle 4 fixed to the lower end of the injection valve body 2 . The solenoid valve 3 includes a connector C connected to wiring from an engine control unit (ECU) (not shown) and is controlled by a control signal from the ECU.

[0028] The injection valv...

example 2

[0056] (Structure of Example 2)

[0057] image 3 The metal sealing surface of the back end surface 4A of Example 2 of the present invention is shown. Example 2 differs from Example 1 in that an external recess 6A is provided so that the bore reaches a position where an extension line from the center of the syringe 45 to the high-pressure fuel hole 46A intersects the outermost boundary. Therefore, only the vicinity of the high-pressure fuel hole 46A becomes a sealing surface, and not the vicinity of the high-pressure fuel hole 46A becomes a depression communicating with the outer peripheral portion.

[0058]Under this structure, the seal surface includes a seal surface portion of the adjacent portion centered on the high-pressure fuel hole 46A and a seal surface portion centered on the low-pressure fuel hole 47A and having almost half of the outer peripheral boundary. Therefore, the sealing surface can utilize a smaller area to play a sealing role. In particular, the vicini...

example 3

[0063] (Structure of Example 3)

[0064] Figure 4 show image 3 The metal sealing structure of the back end face 4A. The retaining sealing surface 46B is provided in the recess 6A of Example 2, which is formed by boring in an area other than the vicinity of the high-pressure fuel hole 46A. The holding sealing surface 46B has a quarter-sector shape as high as the outer peripheral boundary symmetrically with respect to the high-pressure fuel hole 46A, and is separated from the vicinity of the high-pressure fuel hole 46A by retaining a portion of the recess 6A of Example 2.

[0065] This structure makes the vicinity of the high-pressure fuel hole 46A and the retaining sealing surface 46B connected to the outer peripheral boundary become a flat metal sealing surface, forming a sealing surface that receives axial force uniformly.

[0066] In this structure, except for the sealing surface adjacent to the high-pressure fuel hole 46A, the surface pressure is slightly lowered due t...

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PUM

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Abstract

A tip end surface of a valve body and a back end surface of an injection nozzle contact each other with pressure by being fastened using a retaining nut and thereby form a metal seal structure to achieve a metal seal. To increase a surface pressure in a seal surface by fastening axial force, conventional recesses around the central axis of a nozzle are replaced so that proximity of a high pressure fuel hole is secured as a seal surface. An outside recess is provided outside of the proximity of the high pressure fuel hole to link with an outer peripheral border of the metal seal structure. Alternatively, a contact surface functioning as a retaining seal surface is added outside of the outside recess to be apart from the proximity of the high pressure fuel hole.

Description

technical field [0001] The present invention relates to an injector (fuel injection valve) that injects high-pressure fuel accumulated in a common rail to a combustion chamber of an internal combustion engine by pressurization using a high-pressure feed pump. Background technique [0002] Injectors are used in accumulator-type fuel injection devices such as diesel engines, and inject high-pressure fuel from the common rail into the combustion chamber of the engine. This injector includes an injection valve main body having a nozzle at its end, and a driving device such as a solenoid valve arranged near the rear end of the injection valve main body. A driving device such as a solenoid valve receives a control signal from an engine control unit (ECU) to displace a control piston included in an injection valve body and a needle included in a nozzle, thereby opening and closing a fuel injection hole of the nozzle. This on / off control adjusts the amount, timing or the like of in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M47/00
CPCF02M2200/16F02M63/0015F02M47/027F02M55/005
Inventor 中津明东条千太伊藤正佳植木充
Owner DENSO CORP
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