WO2011162484A2

WO2011162484A2 - Fuel injection valve

Info

Publication number: WO2011162484A2
Application number: PCT/KR2011/003734
Authority: WO
Inventors: 신문성; 강경균
Original assignee: 주식회사 케피코
Priority date: 2010-06-23
Filing date: 2011-05-20
Publication date: 2011-12-29
Also published as: WO2011162484A3; JP2013530344A; JP5536282B2; EP2587046A4; CN102985679A; KR20110139374A; CN102985679B; KR101160043B1; EP2587046A2; EP2587046B1

Abstract

The present invention relates to a fuel injection valve. The fuel injection valve according to the present invention is a fuel injection valve for an internal combustion engine, and comprises: a needle that moves within the valve housing; a valve seat defining an opening/closing hole therein which is opened and closed by the needle; an orifice plate pressed against the bottom of the valve seat, for injecting fuel through an injection hole; a fuel tube that is a passage for supplying the fuel injected from the orifice plate to the internal combustion engine; and a tube adapter installed between the orifice plate and the fuel tube, in order to prevent the leakage of fuel supplied from the orifice plate to the fuel tube. According to the present invention, because the tube adapter is installed on the end of the fuel injection valve in order to prevent an opening from forming between the orifice plate and the fuel tube of the fuel injection valve, fuel that leaks through a gap between the orifice plate and fuel tube and vaporizes so as to induce the build-up of residual matter on the nozzle surface of the fuel injection valve can be prevented. Thus, a reduction in the area of the nozzle injection hole and a decrease in the performance of the fuel injection valve due to residue build-up is prevented, shortened service life of the fuel injection valve due to leaking fuel is prevented, supplemental devices for preventing fuel leakage can be removed, and improved vehicle performance and air pollution prevention can be realized. Moreover, a gap will not form between the fuel injection valve and the fuel tube because a portion of the fuel tube is assembled to the inside of the fuel injection valve, and a sealing member is introduced at the interface of the fuel tube and the valve housing in order to doubly prevent fuel leakage.

Description

Fuel injection valve

The present invention relates to a fuel injection valve, and more particularly to a fuel injection valve of an internal combustion engine provided to concentrate fuel in a localized region.

In general, a fuel injection valve called an injector is a device for injecting a liquid with pressure from a nozzle. In general, a diesel engine injects fuel when a pressure of a fuel reaches a set value by a needle valve, and in a gasoline engine, a solenoid is injected to inject fuel by an injection signal sent from a computer. The needle valve is integrated with the plunger so that when the injection signal is transmitted to the fuel injection valve, the ball valve and the valve shaft integrated with the plunger magnetized by the injection signal are pulled to open the pore and simultaneously fuel is injected. The injection amount of fuel is determined by the opening time of the needle valve, that is, the energization time of the solenoid coil.

In the conventional fuel injection valve, the end of the fuel injection valve and the fuel tube are assembled in the form of abutment, so that a combined tolerance of the assembled parts is formed, and the coupling tolerance is formed between the end of the fuel injection valve and the fuel tube. There is a case where fuel is leaked to the outside. That is, as shown in FIG. 8, between the orifice plate 104 and the fuel tube 106 interposed between the bottom surface of the valve seat 103 positioned at the bottom of the fuel injection valve and the top surface of the fuel tube 106. When a mating tolerance occurs, the fuel to be injected in the flow path 161 of the fuel passage 106 flows out of the fuel passage 106 as shown by the arrows in FIG. 8.

In this way, the fuel flowing out is vaporized while leaving residue on the fuel injection valve surface of the fuel injection valve. As such, the residual material deposited on the fuel injection valve surface decreases the area of the injection hole of the fuel injection valve, thereby deteriorating the performance of the fuel injection valve, and some of the spilled fuel is released to the outside of the vehicle to cause air pollution. .

In addition, by depositing the deposits around the injection port of the fuel injection valve additionally generates a cleaning cost for removing the deposits when the vehicle maintenance.

In addition, the fuel tube using a relatively soft material such as Teflon is easy to assemble in a misaligned state with the fuel injection valve, thereby worsening the assembly degree as well as fuel leakage.

In addition, when the fuel injected from the fuel injection valve is discharged to the outside by leaving the flow path has a problem that the performance of the vehicle, such as output and fuel economy is also deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an orifice plate and a fuel at the end of the fuel injection valve by attaching a tube adapter for preventing the fuel tube from opening between the orifice plate and the fuel tube. As the fuel spilled through the gap with the tube prevents the residue from depositing on the nozzle surface of the fuel injection valve while vaporizing, it reduces the nozzle area of the nozzle and deteriorates the performance of the fuel injection valve. The present invention provides a fuel injection valve capable of suppressing shortening of the life of the fuel injection valve due to the outflow, removing an additional device for preventing the outflow of fuel, and improving performance of the vehicle and preventing air pollution.

In addition, another object of the present invention is to allow a part of the fuel tube to be assembled inside the fuel injection valve, so that the gap between the fuel injection valve and the fuel tube does not occur, and the airtight member is provided on the contact surface between the fuel tube and the valve housing. It is to provide a fuel injection valve that prevents fuel leakage double by intervening.

In addition, another object of the present invention is to compact the parts used to prevent fuel leakage in the double prevention of fuel leakage as described above without compromising fuel sealing performance or injection performance, but rather improving the fuel leakage prevention component It is to provide a fuel injection valve that can reduce the manufacturing process or cost.

In order to achieve the above object, the present invention provides a fuel injection valve for an internal combustion engine, comprising: a needle moving inside the valve housing; A valve seat having an opening and closing hole for opening and closing the needle therein; An orifice plate in close contact with the lower portion of the valve seat and injected with fuel through the injection hole; A fuel tube which is a passage for supplying fuel injected from the orifice plate to the internal combustion engine; And a tube adapter installed between the orifice plate and the fuel tube to prevent the outflow of fuel supplied from the orifice plate to the fuel tube.

In addition, the tube adapter in the present invention is characterized in that it comprises a close contact portion in close contact with the bottom surface of the orifice plate, and an outer bent portion that the outer side of the contact portion is bent downward.

In addition, the tube adapter in the present invention is characterized in that it further comprises an inner bent portion that the inside of the close contact portion is bent downward.

In addition, the inner bent portion in the present invention is characterized in that the outer peripheral surface is inserted and fixed to the inner circumferential surface of the circular groove formed to be connected to the fuel tube flow path in the center of the upper surface of the fuel tube or the inner circumferential surface is press-fit fixed to the step formed on the outer peripheral surface of the upper surface of the fuel tube do.

In addition, the fuel tube in the present invention is characterized in that the flange portion protrudes on the upper end in close contact with the bottom surface of the orifice plate.

In addition, the present invention is characterized in that the outer peripheral surface of the flange portion is in close contact or spaced apart from the inner peripheral surface of the valve housing.

Further, in the present invention, when the outer peripheral surface of the flange portion and the inner peripheral surface of the valve housing is in close contact, the sealing member is characterized in that the contact surface.

In the present invention, when the outer peripheral surface of the flange portion and the inner peripheral surface of the valve housing are spaced apart, the surface of the orifice plate is in close contact with the inner wall of the valve housing adjacent to the bottom surface of the valve seat.

In addition, in the present invention, the outer bent portion of the tube adapter is characterized in that it is welded to the inner wall of the valve housing.

The present invention also provides a fuel injection valve for an internal combustion engine, comprising: a needle moving inside the valve housing; A valve seat having an opening and closing hole for opening and closing the needle therein; A fuel tube which is a passage for supplying fuel injected from the valve housing to an internal combustion engine; And a tube adapter interposed between the valve seat and the fuel tube to inject fuel through an injection hole, and prevent the fuel injected from the injection hole from flowing out between the fuel tube and the fuel tube. .

In addition, in the present invention, the tube adapter is in close contact with the bottom surface of the valve seat, the outer bent portion bent downward from the outside of the contact portion, and inserted into the flow path of the fuel tube to be in close contact with the flow path surface. It characterized in that it comprises an inner bent portion protruding downward from the inside of the contact portion.

In the present invention, the inner bent portion is characterized in that the conical inclined portion is formed so that the inner diameter is gradually reduced toward the injection hole.

In addition, in the present invention, the inner bent portion, the inclined portion extending along the inclined surface to the bottom of the inclined surface of the flow path; And a flat portion extending from the lower end of the inclined portion to be orthogonal to the axis of the flow path.

1 is an exploded perspective view showing a state in which a fuel tube is separated from a fuel injection valve according to a first embodiment of the present invention.

2 is a side cross-sectional view showing a state in which a fuel tube is coupled to the fuel injection valve.

3 is a side cross-sectional view showing a state in which a fuel tube is coupled to a fuel injection valve according to a second embodiment of the present invention.

4 is a side sectional view showing a state in which a fuel tube is coupled to a fuel injection valve according to a third embodiment of the present invention.

5 is a side cross-sectional view illustrating a state in which a fuel tube is coupled to a fuel injection valve according to a fourth embodiment of the present invention.

6 is a side cross-sectional view illustrating a state in which a fuel tube is coupled to a fuel injection valve according to a fifth embodiment of the present invention.

7 is a side cross-sectional view illustrating a state in which a fuel tube is coupled to a fuel injection valve according to a sixth embodiment of the present invention.

8 is a view showing a fuel tube coupled state of a conventional fuel injection valve.

Hereinafter, embodiments of the fuel injection valve of the present invention will be described with reference to the accompanying drawings.

The fuel injection valve according to the present embodiment includes a valve housing 1, a needle 2, a valve seat 3, an orifice plate 4, a tube adapter 5 and a fuel tube as shown in FIGS. 1 and 2. It includes (6).

The valve housing 1 is provided with a needle 2 in the longitudinal hole to form a magnetic passage when the solenoid coil is energized.

The needle 2 is provided inside the valve housing 1 and moves in the longitudinal direction by an electromagnetic circuit when power is applied, and is composed of a ball valve 21 and a valve shaft 22.

The ball valve 21 has a closed surface 21a formed at the bottom thereof, and the valve shaft 22 is coupled to each other by welding or the like at the upper end of the ball valve 21 to move along the longitudinal direction of the valve housing 1. do.

The valve seat 3 is provided inside the valve housing 1, and a contact surface 31 is formed at an inner lower end of the valve seat 3 in close contact with or separated from the ball valve 21. Opening and closing hole 32 is connected to the bottom is formed.

At this time, when the closing surface 21a of the ball valve 21 is completely in contact with the contact surface 31 connected to the opening and closing hole 32, the fuel supply is stopped, and the closing surface 21a of the ball valve 21 is the contact surface. When spaced at 31, the fuel supply is made, and the fuel supply amount is adjusted according to the separation degree.

The orifice plate 4 is in the shape of a disk that is installed in close contact with the lower end of the valve seat 3, the injection hole 41 for measuring the flow rate and flow rate when the fuel passes through is formed in the center.

Here, the injection hole 41 is illustrated as one is formed in the center of the orifice plate 4, but may be formed in the form of a slit (slit) in one, a plurality of holes or slits in the circumferential direction It may be formed to be arranged at equal intervals.

As such, when a plurality of the injection holes 41 are formed along the circumferential direction, the injection holes 41 may be positioned inside the inner bent portion 53 of the tube adapter 5, and may further promote atomization of fuel particles. By reducing the thickness of the orifice plate 4 so that the diameter of the injection hole 41 can be further reduced.

The tube adapter 5 is interposed between the orifice plate 4 and the fuel tube 6 so that the injection hole 41 of the orifice plate 4 and the flow path 61 of the fuel tube 6 have no gaps. By being in close contact with each other, the fuel is prevented from flowing out of the flow path 61.

At this time, the tube adapter 5 has a disc-shaped contact portion 51, an outer bent portion 52 formed to bend the outer edge of the contact portion 51 downward, and the center of the contact portion 51 A hole is formed at the same time and the inner edge of the hole includes an inner bent portion 53 that is bent downward.

That is, the coupling structure of the tube adapter 5 is inserted into the valve housing 1 and closely adhered to the close contact portion 51 attached to the bottom surface of the orifice plate 4 without interfering with the injection hole 41. The outer bent portion 52 is bent downward from the outer edge end of the portion 51 and bent downward so as to be coupled to the fuel tube 6 on the bottom surface of the central portion of the contact portion 51 so that the outer circumferential surface thereof is the fuel tube ( The inner bent part 53 is inserted and fixed to the inner peripheral surface of the flow path 61 of 6).

In particular, since the inner bent portion 53 of the tube adapter 5 is bent downward, a circular groove connected to the flow path 61 at the center of the upper surface of the fuel tube 6 so as to correspond to the shape of the inner bent portion 53 ( 64) is formed. In this way, since the outer circumferential surface of the inner bent portion 53 of the tube adapter 5 is inserted and fixed to the inner circumferential surface of the circular groove formed in the center of the upper surface of the fuel tube 6, there is an advantage of easy coupling according to the insertion method.

Moreover, the tube adapter 5 is welded to the inner circumferential surface of the valve housing 1 by heat applied by the outer circumferential surface of the outer bent portion 52 to the outside of the valve housing 1.

The fuel tube 6 is a passage through which the fuel injected from the injection hole 41 of the orifice plate 4 is supplied to the internal combustion engine (not shown), and the upper end thereof is the orifice plate 4 by the tube adapter 5. It is in close contact with the bottom of the) and the bottom is connected to the internal combustion engine.

As a result, the embodiment is easy to separate for maintenance without the occurrence of a gap between the fuel injection valve and the fuel tube 6 by the fuel tube 6.

Second Embodiment

The fuel injection valve according to the present embodiment includes a valve housing 1, a needle 2, a valve seat 3, an orifice plate 4, a tube adapter 5a and a fuel tube 6 as shown in FIG. The valve housing 1, the needle 2, the valve seat 3 and the orifice plate 4 have the same structure and function as those of the first embodiment, and thus detailed description thereof will be omitted.

The tube adapter 5a is interposed between the orifice plate 4 and the fuel tube 6 so that the injection hole 41 of the orifice plate 4 and the flow path 61 of the fuel tube 6 have no gaps. Close contact prevents fuel from flowing out of the flow path.

At this time, the tube adapter (5a) is in the center of the contact portion (51a) of the disc shape, the outer bent portion (52a) is formed to be bent downward of the edge of the contact portion (51a), and the contact portion (51a) At the same time as the hole is formed, the inner edge of the hole includes an inner bent portion (53a) is bent downward.

In particular, unlike the first embodiment, the inner bent portion 53a is press-fixed and fixed to the outer circumferential surface of the fuel tube 6, thereby improving the engagement force with the fuel tube 6.

Since the inner bent portion 53a of the tube adapter 5a is bent downward, a step 65 is formed on the outer peripheral surface of the upper surface of the fuel tube 6 so as to correspond to the inner diameter shape of the inner bent portion 53a.

In addition, the tube adapter 5a is also welded to the inner circumferential surface of the valve housing 1 by heat applied by the outer circumferential surface of the outer bent portion 52a to the outside of the valve housing 1.

As a result, in the above embodiment, since the upper end of the fuel tube 6 is press-fitted into the fuel injection valve, the separation for maintenance is easy without the gap between the fuel injection valve and the fuel tube 6, and the mutual coupling force is improved. do.

Third Embodiment

As shown in FIG. 4, the fuel injection valve according to the present embodiment includes a valve housing 1, a needle 2, a valve seat 3, an orifice plate 4, a tube adapter 5b, and a fuel tube 6. The valve housing 1, the needle 2 and the valve seat 3 have the same structure and function as those of the first and second embodiments, and thus detailed description thereof will be omitted.

The orifice plate 4 is formed in the center of the injection hole 41 for measuring the flow rate and flow rate adjustment when passing the fuel, the valve seat contact surface 4a in contact with the lower end of the valve seat 3, A valve housing contact bent portion 4b is formed to be bent downward from the edge of the valve seat tight contact surface 4a to be installed in close contact with the lower end of the valve seat 3 and the inner circumferential surface of the adjacent valve housing 1.

The tube adapter 5b is provided to be in close contact with the bottom surface of the flange portion 62 formed at the upper end of the fuel tube 6 and the inner circumferential surface of the valve housing 1 so that the flange portion 62 of the fuel tube 6 is orifice plate. Close to (4) side to prevent fuel from flowing out of the flow path.

Furthermore, the tube adapter 5b has an upper surface of the tube adapter 5b on the bottom surface of the flange portion 62 of the fuel tube 6 that penetrates the center portion of the close contact portion 51b that is in close contact with the bottom surface of the valve seat 3. The through hole is formed to be in contact.

Since the fuel tube 6 is provided with the housing contact bent portion 4b at the edge of the orifice plate 4 as described above, the flange portion 62 is provided in a state spaced apart from the inner circumferential surface of the valve housing 1.

As a result, the embodiment has the advantage that the gap between the fuel injection valve and the fuel tube 6 does not occur because the flange portion 62 formed on the top of the fuel tube 6 is assembled in the fuel injection valve.

Therefore, in the above embodiment, since the flange portion 62 formed on the upper end of the fuel tube 6 is closely adhered to the orifice plate 4 by the tube adapter 5b, the fuel is prevented from flowing out of the flow path. Secondly, since the outer bent portion 52b of the tube adapter 5b is welded to the inner circumferential surface of the valve housing 1, fuel is prevented from flowing out of the flow path.

Fourth Embodiment

The fuel injection valve according to another embodiment of the present invention includes a valve housing 1, a needle 2, a valve seat 3, an orifice plate 4, a tube adapter 5c and a fuel as shown in FIG. It includes a tube (6), the valve housing (1), the needle (2), the valve seat (3) and the orifice plate (4) have the same structure and function as those of the first and second embodiments above, and thus the detailed description is omitted. do.

The tube adapter 5c is positioned so that the upper surface is in contact with the bottom surface of the flange portion 62 of the fuel tube 6, and the O-ring between the outer circumferential surface of the flange portion 62 and the inner circumferential surface of the valve housing 1. through the sealing member 63, such as -ring) to prevent the leakage of fuel.

At this time, the tube adapter 5c is composed of a disk-shaped contact portion 51c and an outer bent portion 52c formed by bending the edge of the contact portion 51c downward, and the contact portion 51c The through hole is formed in the center portion so that the fuel tube 6 penetrates and the upper surface of the tube adapter 5c is in contact with the bottom surface of the flange portion 62.

The fuel tube 6 is provided in a state in which the outer circumferential surface of the flange portion 62 is in close contact with the inner circumferential surface of the valve housing 1, and an O-ring or the like between the inner and outer circumferential surfaces of the valve housing 1. The sealing member 63 is further provided.

As a result, in the embodiment, the flange portion 62 formed on the upper end of the fuel tube 6 is in close contact with the orifice plate 4 by the tube adapter 5b to prevent the fuel from flowing out of the flow path. Secondly, since the outer bent portion 52c of the tube adapter 5b is welded to the inner circumferential surface of the valve housing 1, not only the fuel is prevented from flowing out of the flow passage but also the fuel tube 6 is Fuel is prevented from flowing out of the flow path by the sealing member 63 provided on the outer circumferential surface of the flange portion 62 of the c).

Fifth Embodiment

The fuel injection valve according to another embodiment of the present invention comprises a needle 2, a valve seat 3, a fuel tube 6, and a tube adapter 5, as shown in FIG. In particular, except for the needle 2, the valve seat 3, and a part of the fuel tube 6, most of them are the same as those of the first to fourth embodiments, and detailed description thereof is omitted in the present embodiment. In particular, in the fuel injection valve according to the present embodiment, as can be seen in FIG. 6, the functions of the orifice plate and the tube adapter of the other embodiment are integrated in one tube adapter 5.

The tube adapter 5 is interposed between the valve seat 3 and the fuel tube 6 so as to inject fuel through the injection hole 41, the fuel injected from the injection hole 41 is a fuel tube ( 6) It prevents it from leaking out. To this end, the tube adapter 5 is manufactured in the form of a washer bent a thin plate, as shown in Figure 6, it consists of a close portion 51, the outer bent portion 52, and the inner bent portion 53.

Here, first, the close contact portion 51 is a portion in close contact with the bottom surface of the valve seat 3, similar to the orifice plate of the other embodiment described above, and the leaf portion in which the central portion is concave in a circular shape due to the inner bent portion 53. It is shaped like a disc. In addition, the outer bent portion 52 is formed by bending the outer edge portion of the outer side of the contact portion 51 downward like the tube adapter outer bent portion of the other embodiments described above, the outer peripheral surface of the valve housing (1) By the heat applied from the outside of the) is welded to the inner peripheral surface of the valve housing (1). Finally, the inner bent portion 53 is formed by concave downward to the inner edge of the circular portion formed in the central portion of the contact portion 51, the flow path of the fuel tube 6 as shown in FIG. It is inserted into 61 and is in close contact with the flow path surface of the flow path 61. Here, the inner bent portion 53 may be formed in various forms, as shown in Figure 6 may be formed in the form of a nozzle protruding toward the tube (6), in this case the injection hole 41 of the lower It is formed as a tapered conical inclined portion so that the inner diameter is gradually reduced toward.

Therefore, according to the above embodiment, the tube adapter and the orifice plate are integrated into one, so that the total number of processes can be shortened, thereby reducing the cost. In addition, since the depth of the tube adapter 6 inserted into the flow path 61 is deepened and the center is automatically aligned due to the central conical shape, the coupling force between the fuel injection valve and the fuel tube 6 is increased, and the tube The sealing performance between the adapter 6 and the fuel tube 6 is improved.

Sixth Embodiment

On the other hand, a fuel injection valve according to another embodiment of the present invention is shown in Figure 7, the fuel injection valve according to this embodiment is a tube adapter (5) to the function of the orifice plate and tube adapter as in the fifth embodiment It is integrated into the bar 51, the outer bent portion 52, and the inner bent portion (53).

Here, the tube adapter 5 applied in the present embodiment, as shown in Figure 7, the inner bent portion 53 is composed of two parts of the inclined portion 53-1 and flat portion 53-2 again Bar, the inclined portion (53-1) is in the shape of a truncated cone so as to be seated along the inclined surface from the top edge of the inclined surface of the top of the flow path 61 to the bottom edge where the inclined surface ends, the flat portion (53-2) It is bent at the lower end of 53-1) and is formed to extend flat so as to be orthogonal to the axis of the flow path 61.

As a result, according to the above embodiment, as in the fifth embodiment, it is possible to reduce the overall process number and cost by integrating the tube adapter and the orifice plate, and the fuel injection valve and the fuel due to the characteristic of the conical inclined portion. It is possible to increase the bonding force of the tube 6 and to improve the sealing performance between the tube adapter 6 and the fuel tube 6. In addition, since the injection hole 41 penetrates the flat portion 53-2, not only can the machining performance of the injection hole 41 be improved during mass production, but also the injection hole 41 is injected into the flow path 61 through the injection hole 41. It is possible to improve the injection stability of the fuel.

Although the detailed description of the present invention described above has been described with reference to the preferred embodiment of the present invention, the protection scope of the present invention is not limited to the above embodiment, and those skilled in the art will appreciate It will be understood that various modifications and changes can be made in the present invention without departing from the spirit and scope of the invention.

Such a fuel injection valve of the present invention, by mounting a tube adapter for preventing the opening of the orifice plate and the fuel tube of the fuel injection valve at the end of the fuel injection valve, it is discharged through the gap between the orifice plate and the fuel tube As the raw material vaporizes, it prevents the accumulation of residual material on the nozzle surface of the fuel injection valve, thereby reducing the nozzle area of the nozzle and deteriorating the performance of the fuel injection valve due to the residual material, and shortening the life of the fuel injection valve due to fuel leakage. It is possible to remove the additional device to prevent the leakage of fuel, and to improve the performance of the vehicle and prevent the air pollution.

In addition, a portion of the fuel tube is assembled inside the fuel injection valve so that a gap between the fuel injection valve and the fuel tube does not occur, and fuel leakage is doubled through an airtight member on the contact surface between the fuel tube and the valve housing. It is effective to prevent.

In addition, the tube adapter and orifice plate can be integrated into a single tube adapter to shorten the manufacturing process and thus reduce manufacturing costs, and improve the coupling and sealing performance of the fuel injection valve and the fuel tube, while injecting the fuel injected into the fuel tube. The performance can also be improved.

Claims

In the fuel injection valve for an internal combustion engine,

A needle moving inside the valve housing;

A valve seat having an opening and closing hole for opening and closing the needle therein;

An orifice plate in close contact with a lower portion of the valve seat and into which fuel is injected through an injection hole;

A fuel tube which is a passage for supplying fuel injected from the orifice plate to an internal combustion engine; And

And a tube adapter installed between the orifice plate and the fuel tube to prevent the outflow of the fuel supplied from the orifice plate to the fuel tube.
The method of claim 1,

The tube adapter,

A close contact with the bottom of the orifice plate;

A fuel injection valve, characterized in that it comprises an outer bent portion which is bent downward of the outer side of the close contact portion.
The method of claim 2,

The tube adapter further comprises an inner bent portion in which the inside of the tight portion is bent downward.
The method of claim 3, wherein

The inner bent portion is fuel injection, characterized in that the outer circumferential surface is inserted and fixed to the inner circumferential surface of the circular groove formed to be connected to the fuel tube flow path in the center of the upper surface of the fuel tube or the inner circumferential surface is press-fit fixed to the step formed on the outer circumferential surface of the fuel tube valve.
The method of claim 1,

The fuel tube is a fuel injection valve, characterized in that the flange portion protrudes on the upper end to be in close contact with the bottom surface of the orifice plate.
The method of claim 5,

The outer circumferential surface of the flange portion is in close contact with or spaced from the inner circumferential surface of the valve housing.
The method of claim 6,

And a sealing member intervenes with the contact surface when the outer peripheral surface of the flange portion and the inner peripheral surface of the valve housing are in close contact with each other.
The method of claim 6,

And the outer circumferential surface of the flange portion and the inner circumferential surface of the valve housing are spaced apart from each other so that the surface of the orifice plate is in close contact with the inner wall of the valve housing adjacent to the bottom surface of the valve seat.
The method of claim 2,

The outer bent portion of the tube adapter is welded to the inner wall of the valve housing characterized in that the fuel injection valve.
In the fuel injection valve for an internal combustion engine,

A needle moving inside the valve housing;

A valve seat having an opening and closing hole for opening and closing the needle therein;

A fuel tube which is a passage for supplying fuel injected from the valve housing to an internal combustion engine; And

And a tube adapter interposed between the valve seat and the fuel tube to inject fuel through an injection hole, and prevent the fuel injected from the injection hole from flowing out between the fuel tube and the fuel tube. Injection valve.
The method of claim 10,

The tube adapter,

A close contact with the bottom of the valve seat;

An outer bent portion that is bent downward from the outside of the close contact portion;

And an inner bent portion which is inserted into the flow path of the fuel tube and protrudes downward from the inside of the contact portion to be in close contact with the flow path surface.
The method of claim 11,

And the inner bent portion forms a conical inclined portion to gradually reduce an inner diameter toward the injection hole.
The method of claim 12,

The inner bent portion,

An inclined portion extending along the inclined surface to a lower end of the inclined surface of the flow path; And

And a flat portion extending from the lower end of the inclined portion to be orthogonal to the axis of the flow path.