JPH09264230A - Fuel injection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely prevent secondary injection of fuel by arranging a delivery valve on a fuel flow inlet communicated to the injection hole of a fuel injection nozzle, and connecting a fuel injection pump and the delivery valve with each other. SOLUTION: Fuel injected from a fuel injection pump 11 is supplied from an injection pipe 51 to a delivery valve 41 arranged on a fuel flow-in part 23b, a piston 45 is removed to an inner end side of a cylinder part 43a by injection pressure of fuel which is improved more than energizing force of a coil spring 47, and it flows from a fuel passage groove 45b into the fuel passage 23c of a fuel injection nozzle 21. Fuel is filled to a pressure hole, a needle valve 31 is removed by pressure which is improved more than the energizing force of a coil spring 33, and fuel is injected from an injection hole. When injection of fuel having a prescribed rate is completed by the fuel injection pump 11, pressure in the injection pipe 51 is reduced, the piston 45 of the delivery valve 41 is pushed and returned, and the valve is closed. It is thus possible to stop fuel injection from the injection hole.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fuel injection device for injecting fuel into a combustion chamber of a diesel engine.

[0002]

2. Description of the Related Art Generally, a diesel engine mounted on an automobile or the like is provided with a fuel injection device for injecting fuel such as light oil into a combustion chamber of the engine. FIG.
1 shows a fuel injection device of this type, and reference numeral 1 denotes a fuel injection pump.

The fuel injection pump 1 injects a predetermined amount of fuel by moving a plunger 3 arranged in a plunger barrel 2. A delivery valve 4 is integrally formed with the fuel injection pump 1. The delivery valve 4 opens when the piston 6 biased by the spring 5 is moved by the jet pressure when fuel is jetted from the fuel injection pump 1 and is opened, and when the jet of fuel is stopped, the biasing force of the spring 5 is exerted. As a result, the piston 6 is pushed back and the valve is closed.

The delivery valve 4 is connected to the fuel injection nozzle 8 by a pipe 7. This fuel injection nozzle 8
When the fuel is supplied from the delivery valve 4 at a predetermined pressure, the needle valve 10 biased by the spring 9 is opened,
Fuel is injected into the combustion chamber of the engine from the injection hole 8a formed at the tip. In the above-described fuel injection device, when the fuel is ejected from the fuel injection pump 1, the piston 6 is moved by the ejection pressure of the fuel to open the delivery valve 4, and then the fuel is injected into the fuel injection nozzle 8 by the pipe 7. The fuel is supplied and the fuel is injected from the injection hole 8a of the fuel injection nozzle 8 into the combustion chamber of the engine.

When the injection of fuel from the fuel injection pump 1 is stopped, the piston 6 is moved by the urging force of the spring 5 to close the delivery valve 4 and the fuel is supplied to the fuel injection nozzle 8. It is stopped immediately and secondary injection of fuel into the combustion chamber is prevented. As a result, incomplete combustion of the engine can be prevented, and the amount of black smoke, exhaust odor, and HC (hydrocarbon) generated can be reduced.

[0006]

However, in the above-described fuel injection device, the delivery valve 4 is integrally formed with the fuel injection pump 1, and the distance between the delivery valve 4 and the fuel injection nozzle 8 is, for example, 0. Since they are connected by a long pipe 7 of about 7 m, when the delivery valve 4 is opened and closed, a pressure wave is generated due to the elasticity of the pipe 7, and the secondary injection occurs due to the influence of this pressure wave. In particular, there was a problem that engine performance and exhaust gas characteristics deteriorate when the engine is operating at high speed and under high load.

The present invention has been made in order to solve the above-mentioned conventional problems, and reliably prevents the secondary injection of fuel,
An object of the present invention is to provide a fuel injection device capable of improving engine performance and exhaust gas characteristics more easily and surely than ever before.

[0008]

According to a first aspect of the present invention, there is provided a fuel injection device for ejecting a predetermined amount of fuel by moving a plunger arranged in a plunger barrel.
When the fuel is ejected from the fuel injection pump, the piston biased by the first biasing member is moved by the ejection pressure to open the valve, and when the ejection of the fuel is stopped, the first
Of the delivery valve, in which the piston is pushed back by the urging force of the urging member and is closed, and the needle valve urged by the second urging member when the fuel is supplied from the delivery valve at a predetermined pressure. A fuel injection nozzle for injecting the fuel into a combustion chamber of an engine from an injection hole formed at a valve tip, the delivery valve being arranged at a fuel inlet port communicating with the injection hole of the fuel injection nozzle, The fuel injection pump and the delivery valve are connected by a pipe.

The fuel injection device according to a second aspect of the present invention is the first aspect.
In the fuel injection device described above, the delivery valve is detachably arranged in the fuel injection nozzle. The fuel injection device according to claim 3, wherein a fuel injection pump that ejects a predetermined amount of fuel by movement of a plunger arranged in the plunger barrel, and a first biasing force when the fuel is ejected from the fuel injection pump. A delivery valve in which the piston biased by the member is moved by the ejection pressure to open the valve, and when the ejection of the fuel is stopped, the piston is pushed back and closed by the biasing force of the first biasing member, and the delivery valve. When the fuel is supplied at a predetermined pressure from the valve, a needle valve that is urged by a second urging member is opened, and the fuel is injected into a combustion chamber of the engine from an injection hole formed at the tip. A fuel inlet port that connects the fuel injection pump and the delivery valve with a first pipe, and that communicates with the delivery valve and the injection hole of the fuel injection nozzle. And characterized by being connected to a second pipe.

(Operation) In the fuel injection device according to the first aspect, when the fuel is ejected from the fuel injection pump, the piston is moved by the ejection pressure of the fuel supplied through the pipe, and the delivery valve is opened. Then, the fuel is supplied to the fuel injection nozzle, and the fuel is injected from the injection hole of the fuel injection nozzle.

When the fuel injection pump finishes ejecting a predetermined amount of fuel, the piston is moved by the urging force of the spring, the delivery valve is closed, and then the supply of fuel to the fuel injection nozzle is stopped. The fuel injection from the injection hole is immediately stopped. In the fuel injection device according to the second aspect, the delivery valve arranged in the fuel injection pump is freely attached and detached.

In the fuel injection device of the third aspect, when the fuel is ejected from the fuel injection pump, the piston is moved by the ejection pressure of the fuel supplied through the first pipe, and the delivery valve is opened. Then, the fuel is supplied to the fuel injection nozzle through the second pipe, and the fuel is injected from the injection hole of the fuel injection nozzle.

When the fuel injection pump finishes ejecting a predetermined amount of fuel, the piston is moved by the urging force of the spring, the delivery valve is closed, and then the supply of fuel to the fuel injection nozzle is stopped. The fuel injection from the injection hole is immediately stopped.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment (corresponding to claim 1) of the fuel injection device of the present invention.
Reference numeral 11 indicates a fuel injection pump. A pump housing 13 is arranged in the fuel injection pump 11. The pump housing 13 includes a plunger barrel 15
Is built-in. In this plunger barrel 15,
A plunger 17 for ejecting a predetermined amount of fuel is slidably arranged.

A connecting member 19 is arranged at the upper end of the pump housing 13. A male screw portion 19a is integrally formed on the upper end of the connecting member 19. Connection member 1
At the center of 9 is formed a fuel passage hole 19b which penetrates in the axial direction and through which the fuel from the plunger 17 passes.
The first pipe connection port 19 is provided at the upper end of the fuel passage hole 19b.
c is formed.

Reference numeral 21 indicates a fuel injection nozzle which is arranged in the vicinity of a combustion chamber of an engine (not shown). A nozzle holder 23 is arranged on the fuel injection nozzle 21. A nozzle assembly 25 is arranged at the tip of the nozzle holder 23. A retaining nut 27 is fitted on the nozzle assembly 25 and is fixed to the nozzle holder 23.

A push rod 29 is arranged at the center of the nozzle holder 23 so as to be movable in the axial direction. A needle valve 31 is arranged at the tip of the push rod 29 and is movable together with the push rod 29.
On the other hand, a coil spring 33 is arranged at the rear end of the push rod 29.

At the rear end of the nozzle holder 23, a female screw portion 23a is formed on the inner peripheral surface where the coil spring 33 is positioned. An adjusting screw 35 is arranged in the female screw portion 23a. A male screw portion 35a is formed on the outer peripheral surface of the adjusting screw 35, and a lower portion of the male screw portion 35a is screwed into the female screw portion 23a by a predetermined amount.

The coil spring 33 is brought into a compressed state by screwing the adjusting screw 35, and the push rod 29 is biased toward the tip of the nozzle holder 23. The biasing force of the coil spring 33 can be adjusted by the screwing depth of the adjusting screw 35.

A gasket 37 is sandwiched between the cap nut 3 and the upper portion of the outer peripheral surface of the adjusting screw 35.
9 is screwed. A fuel inflow portion 23b is integrally formed on the side surface of the nozzle holder 23. Fuel inflow part 23
In b, a fuel inlet 23d is formed which communicates with a nozzle hole 57c described later by the fuel passage 23c.

The delivery valve 4 is provided in the fuel inflow portion 23b.
1 is arranged. A delivery valve seat 43 is arranged in the delivery valve 41, and the delivery valve seat 43 is fitted in the fuel inlet port 23d.

The delivery valve seat 43 is formed with a cylinder portion 43a penetrating in the axial direction. A piston 45 is slidably arranged in the cylinder portion 43a. A valve seat 45a that widens toward the tip is formed at the end on the back side of the piston 45.

A fuel passage groove 45b is formed on the outer peripheral surface of the piston 45 from the front end toward the valve seat 45a. A coil spring 47 in a compressed state is arranged on the end surface of the valve seat 45a, and the piston 45 is biased in the direction in which fuel is supplied. A male screw portion 23e is formed on the outer peripheral surface of the fuel inflow portion 23b, and a retaining nut 49 is screwed into the male screw portion 23e.

On the end face of this retaining nut 49,
The male screw portion 49a is integrally formed. At the center of the retaining nut 49, the fuel passage hole 4 penetrating in the axial direction is formed.
9b is formed. At the tip of the fuel passage hole 49b,
The second pipe connection hole 49c is formed.

Fuel injection pump 11 and delivery valve 41
An injection pipe 51 made of steel is arranged between the and. A first nipple 51a and a second nipple 51b are provided at both ends of the injection pipe 51.
Is formed, and further, the first cap nut 53, the second
The cap nut 55 is rotatably arranged.

The first nipple 51a is fitted in the first pipe connection port 19c formed in the connection member 19 of the pump housing 13. Male thread portion 19 of connection member 19
A first cap nut 53 is screwed into a, and an injection pipe 51 is opened in the fuel injection pump 11.

On the other hand, the second nipple 51b is the second nipple formed on the retaining nut 49 of the delivery valve 41.
It is fitted in the pipe connection port 49c. The male screw portion 49a of the retaining nut 49 has a second cap nut 55
Are screwed together, and the injection pipe 51 is opened in the delivery valve 41. As a result, the fuel injection pump 11 and the fuel injection nozzle 21 can be communicated with each other by the injection pipe 51 via the delivery valve 41.

FIG. 2 shows the details of the tip of the nozzle assembly 25. A pressure stage 31a is integrally formed near the tip of the needle valve 31. A conical portion 31b is integrally formed at the tip of the needle valve 31. Needle valve 3
A nozzle body 57 that covers the needle valve 31 is arranged on the outer periphery of the nozzle 1. A pressure hole 57a communicating with the fuel passage 23c is formed near the tip of the nozzle body 57.

In the vicinity of the tip of the nozzle body 57,
A seat surface 57b corresponding to the conical portion 31b of the needle valve 31 is formed. A nozzle hole 57c, which communicates with the fuel passage 23c and injects fuel into the combustion chamber of the engine, is opened at the tip of the nozzle body 57. In the fuel injection device of this embodiment, when fuel is ejected from the fuel injection pump 11,
After passing through the injection pipe 51, the fuel inflow portion 23
High-pressure fuel is supplied to the delivery valve 41 arranged at b, and the piston 45 is moved to the inner side of the cylinder portion 43a by the injection pressure of the fuel that exceeds the biasing force of the coil spring 47, and the fuel is injected from the fuel passage groove 45b. It flows into the fuel passage 23c of the nozzle 21.

As a result, the pressure hole 57a is filled with fuel, a pressure exceeding the biasing force of the coil spring 33 is applied to the pressure stage 31a of the needle valve 31, the needle valve 31 is moved to the rear end side, and the needle valve 31 is moved from the injection hole 57c. Fuel is injected.

When the fuel injection pump 11 finishes injecting a predetermined amount of fuel, the pressure in the injection pipe 51 decreases, and the urging force of the coil spring 47 pushes the piston 45 of the delivery valve 41 back to close it. It Thereby, the pressure hole 5 of the needle valve 31
The pressure of 7a decreases, the needle valve 31 is urged toward the tip side by the urging force of the coil spring 33, and the conical portion 31b is pressed against the seat surface 57b of the nozzle body 57 to cause the injection hole 57c.
The fuel injection from is stopped.

In the fuel injection device configured as described above, the fuel injection pump 11 and the delivery valve 41 are connected by the injection pipe 51, and the delivery valve 41 is connected.
Is disposed in the fuel inflow portion 23b communicating with the injection hole 57c of the fuel injection nozzle 21, a pressure wave is not generated between the delivery valve 41 and the fuel injection nozzle 21, and the secondary injection of fuel is reliably prevented. It is possible to improve engine performance and exhaust gas characteristics more easily and surely than ever before.

FIG. 3 shows a second embodiment (corresponding to claim 2) of the fuel injection device of the present invention.
Reference numeral 61 indicates a delivery valve. A delivery valve holder 63 is arranged in the delivery valve 61. On the outer peripheral surface of both ends of the delivery valve holder 63,
Male screw portions 63a and 63b are formed.

A cylinder portion 63c is formed in the delivery valve holder 63 in the axial direction. Cylinder part 63
A piston 45 is slidably arranged in c. The male screw portion 63 a of the delivery valve holder 63 holds the gasket 65 and holds the fuel inlet 23 of the fuel injection nozzle 21.
The female screw portion 23f formed in d is detachably screwed.

A fuel passage hole 63d is formed in the center of the delivery valve holder 63 so as to penetrate in the axial direction.
The second pipe connecting hole 63 is provided at the tip of the fuel passage hole 63d.
e is formed. The second nipple 51b is fitted in the second pipe connection port 63e formed in the fuel passage hole 63d of the delivery valve holder 63.

Male thread portion 63 of delivery valve holder 63
The second cap nut 55 is screwed into b, and the injection pipe 51 is opened to the delivery valve 61. As a result, the fuel injection pump 11 and the fuel injection nozzle 2
1 and the injection valve 51 can communicate with each other via the delivery valve 61. In addition,
Since the other parts are configured the same as those in the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.

In the fuel injection device of this embodiment, the male screw portion 63a formed in the delivery valve holder 63 of the delivery valve 61 is detachably attached to the female screw portion 23f formed in the fuel inlet 23d of the fuel injection pump 11. It is screwed to. In the fuel injection device configured as described above, substantially the same effect as that of the first embodiment can be obtained, but in this embodiment, the delivery valve 61 is detachably screwed to the fuel injection pump 11. Therefore, the delivery valve 61 can be easily disassembled, and the work efficiency of maintenance and inspection can be greatly improved as compared with the conventional case.

FIG. 4 shows a third embodiment (corresponding to claim 3) of the fuel injection device of the present invention.
Reference numeral 71 indicates a delivery valve. A delivery valve holder 73 is arranged on the delivery valve 71. On the outer peripheral surface of both ends of the delivery valve holder 73,
Male screw portions 73a and 73b are formed.

A cylinder portion 73c is formed in the delivery valve holder 73 in the axial direction. Cylinder part 73
A piston 45 is slidably arranged in c.

A fuel passage hole 73d is formed at the center of the delivery valve holder 73 so as to penetrate in the axial direction.
The second pipe connection hole 73 is provided at the tip of the fuel passage hole 73d.
e is formed. A retaining nut 77 is screwed to the male screw portion 73a of the delivery valve holder 73 while sandwiching the gasket 75.

On the end face of this retaining nut 77,
The male screw portion 77a is integrally formed. At the center of the retaining nut 77, the fuel passage hole 7 penetrating in the axial direction is formed.
7b is formed. At the tip of the fuel passage hole 77b,
A third pipe connection hole 77c is formed.

A connector 79 is arranged at the fuel inlet 23d of the nozzle holder 23. A fuel passage hole 79a is formed in the center of the connector 79 so as to penetrate in the axial direction. Male screw portions 79b and 79c are formed on the outer peripheral surfaces of both ends of the connector 79, and the male screw portion 79b is
It is screwed into a female screw portion 23f formed in the fuel inlet 23d.

A fourth pipe connecting hole 79d is formed at the tip of the fuel passage hole 79a. Fuel injection pump 11
The first injection pipe 81 made of steel is arranged between the delivery valve 71 and the delivery valve 71. This first
A first nipple 81a and a second nipple 81b are formed at both ends of the injection pipe 81 of
Further, the first cap nut 83 and the second cap nut 85 are rotatably arranged.

The first nipple 81a is fitted in the first pipe connection port 19c formed in the connection member 19 of the pump housing 13. Male thread portion 19 of connection member 19
A first cap nut 83 is screwed into a, and a first injection pipe 81 is opened. on the other hand,
The second nipple 81b is fitted in a second pipe connection port 73e formed in the delivery valve holder 73.

Male screw portion 73 of delivery valve holder 73
A second cap nut 85 is screwed into b, and a first injection pipe 81 is opened. A second injection pipe 87 made of steel is arranged between the delivery valve 71 and the fuel injection nozzle 21. In this embodiment, the length of the second injection pipe 87 is 70 mm.

At both ends of the second injection pipe 87, a third nipple 87a and a fourth nipple 87 are provided.
b, the third cap nut 89 and the fourth cap nut 91 are rotatably arranged. The third nipple 87a is fitted into a third pipe connection port 77c formed in the fuel passage hole 77b of the retaining nut 77.

Male screw portion 77a of retaining nut 77
A third cap nut 89 is screwed into this, and a second injection pipe 87 is opened. On the other hand, the fourth nipple 87 b is connected to the fuel passage hole 79 of the connector 79.
It is fitted in the fourth pipe connection port 79d formed in a. A fourth cap nut 91 is screwed into the male screw portion 79c of the connector 79, and a second injection pipe 87 is opened.

As a result, the fuel injection pump 11 and the fuel injection nozzle 21 can be communicated with each other by the first injection pipe 81 and the second injection pipe 87 via the delivery valve 71.

Since the other parts are configured the same as those in the first embodiment, the same parts are designated by the same reference numerals and detailed description thereof will be omitted. In the fuel injection device of this embodiment, when fuel is ejected from the fuel injection pump 11, it passes through the first injection pipe 81, high-pressure fuel is supplied to the delivery valve 71, and the biasing force of the coil spring 47 is exceeded. The piston 45 is moved to the inner side of the cylinder portion 73c by the fuel ejection pressure, passes through the second injection pipe 87 from the fuel passage groove 45b, and flows into the fuel passage 23c of the fuel injection nozzle 21.

As a result, the pressure hole 57a of the nozzle assembly 25, which is shown in detail in FIG. 2, is filled with fuel, and the pressure stage 31a of the needle valve 31 receives a pressure exceeding the urging force of the coil spring 33, and the pressure is applied to the rear end. The needle valve 31 is moved and fuel is injected from the injection hole 57c. When the fuel injection pump 11 finishes injecting a predetermined amount of fuel, the pressure in the first injection pipe 81 decreases, and the urging force of the coil spring 47 pushes the piston 45 of the delivery valve 71 back and closes it. It

As a result, the pressure in the pressure hole 57a of the needle valve 31 is lowered, the needle valve 31 is biased toward the tip side by the biasing force of the coil spring 33, and the nozzle body 57 is pressed.
The conical portion 31b is pressed against the seat surface 57b of the
The injection of fuel from c is stopped. In the fuel injection device configured as described above, almost the same effect as in the first embodiment can be obtained, but in this embodiment, the delivery valve 71 and the fuel injection nozzle 21 are connected to the second injection pipe. Since the connection is made by 87, the second injection pipe 87 can be bent to change the arrangement direction of the delivery valve 71, and the degree of freedom in the arrangement design can be improved.

In the above embodiment, the length is 70.
Although the example in which the second injection pipe 87 of mm is arranged has been described, the present invention is not limited to such an embodiment, and it is desirable that the delivery valve 71 and the fuel injection pump 11 be arranged at the shortest distance. . Further, in the above-described embodiment, an example in which the injection pipe 51 made of steel, the first injection pipe 81, and the second injection pipe 87 are arranged has been described, but the present invention is not limited to this embodiment. Alternatively, the inner surface of the steel pipe may be covered with a material such as stainless steel to have pressure resistance and erosion resistance.

[0054]

As described above, in the fuel injection device according to the first aspect, the fuel injection pump and the delivery valve are connected by a pipe, and the delivery valve is connected to the fuel inlet port communicating with the injection hole of the fuel injection nozzle. Since it is arranged, no pressure wave is generated between the delivery valve and the fuel injection nozzle,
Secondary injection can be reliably prevented, and engine performance and exhaust gas characteristics can be improved more easily and surely than before.

In the fuel injection device of the second aspect, the delivery valve is detachably arranged in the fuel injection pump.
The delivery valve can be easily disassembled, and the work efficiency of maintenance and inspection can be greatly improved compared to the past.
In the fuel injection device according to claim 3, the fuel injection pump and the delivery valve are connected by the first pipe, the delivery valve and the fuel injection nozzle are connected by the second pipe, and the delivery valve is injected by the fuel injection nozzle. Since it is placed on the fuel inlet side that communicates with the hole, pressure waves do not occur between the delivery valve and the fuel injection nozzle, and secondary fuel injection is reliably prevented, and engine performance and exhaust gas characteristics are better than before. It can be easily and surely improved.

Further, since the delivery valve and the fuel injection nozzle are connected by the second pipe, the second pipe can be bent to change the arrangement direction of the delivery valve, and the degree of freedom in the arrangement design can be improved. You can

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of a fuel injection device of the present invention.

FIG. 2 is a cross-sectional view showing details of the nozzle assembly of FIG.

FIG. 3 is a cross-sectional view showing a second embodiment of the fuel injection device of the present invention.

FIG. 4 is a sectional view showing a third embodiment of the fuel injection device of the present invention.

FIG. 5 is a cross-sectional view showing a conventional fuel injection device.

[Explanation of symbols]

 11 Fuel Injection Pump 15 Plunger Barrel 17 Plunger 21 Fuel Injection Nozzle 31 Needle Valve 33 Coil Spring (Second Biasing Member) 41, 61, 71 Delivery Valve 45 Piston 47 Coil Spring (First Biasing Member) 51 Injection Pipe (Pipe) 57c Injection hole 81 First injection pipe (first pipe) 87 Second injection pipe (second pipe)

Claims (3)

[Claims] 1. A fuel injection pump that ejects a predetermined amount of fuel by the movement of a plunger disposed in a plunger barrel; and a first biasing member that biases the fuel when the fuel is jetted from the fuel injection pump. The piston is moved by the ejection pressure to open the valve, and when the ejection of the fuel is stopped, the first
Of the delivery valve, in which the piston is pushed back and closed by the urging force of the urging member, and the needle valve urged by the second urging member when the fuel is supplied from the delivery valve at a predetermined pressure is opened. A fuel injection nozzle for injecting the fuel into a combustion chamber of an engine from an injection hole formed at a tip of the valve, the delivery valve being arranged at a fuel inlet port communicating with the injection hole of the fuel injection nozzle, A fuel injection device comprising a fuel injection pump and the delivery valve connected by a pipe. 2. The fuel injection device according to claim 1, wherein the delivery valve is detachably arranged in the fuel injection nozzle. 3. A fuel injection pump which ejects a predetermined amount of fuel by the movement of a plunger arranged in a plunger barrel; and a first biasing member which biases the fuel when the fuel is jetted from the fuel injection pump. The piston is moved by the ejection pressure to open the valve, and when the ejection of the fuel is stopped, the first
Of the delivery valve, in which the piston is pushed back and closed by the urging force of the urging member, and the needle valve urged by the second urging member when the fuel is supplied from the delivery valve at a predetermined pressure is opened. A fuel injection nozzle for injecting the fuel into a combustion chamber of the engine through an injection hole formed at a tip of the valve, the fuel injection pump and the delivery valve being connected by a first pipe, and the delivery valve A fuel injection device, characterized in that the fuel inlet is connected to the injection hole of the fuel injection nozzle by a second pipe.