JPH02169860A - Fuel injection valve for injection into cylinder - Google Patents

Abstract

PURPOSE:To securely enhance the re-start performance after dead soak by providing an adjoining chamber which adjoins a fuel supply passage and is formed oil-tight, and a fuel circulating passage which circulates the fuel in a fuel tank to the adjoining chamber. CONSTITUTION:A double cylindrical pipe 204, in inner cylindrical body, is arranged in a manner to surround a fuel passage 152 which connects a fuel adjusting part 110 and a control valve 161. The fuel passage 152 is cooled down with the fuel flowing in the double cylindrical pipe 204 to prevent the generation of vapor in the fuel sprayed into a combustion chamber 16, which makes it possible to smoothly start at the re-start after dead soak for a substantial improvement of starting characteristic.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a fuel injection valve for in-cylinder injection used when injecting fuel directly into a combustion chamber (in-cylinder) of an internal combustion engine.

(Prior art) Juzao This is a fuel injection valve for direct injection that aims to form a stratified mixture in the cylinder of an internal combustion engine to improve combustion conditions and improve emissions, fuel efficiency, transient characteristics, etc. It has been proposed (Utility Model Application Publication No. 58-2363). Its schematic structure is as shown in FIG. 6(a), and is roughly divided into two valve parts.

The first valve part has a structure similar to a normal fuel injection valve that injects fuel into the intake pipe, and the first valve body B1 inscribed in the first nozzle N1, which becomes the fuel injection hole, is moved by a spring S1. It has a normally closed structure that is biased in the direction of fuel flow.Fuel is supplied by exciting the coil C1, which is applied to the first coil C1 against the biasing force of the
The valve body B1 is sucked in the direction opposite to the flow direction of the fuel, and the first valve portion is opened. That is, by adjusting the excitation period of the coil C1, the amount of fuel injected from the first valve portion can be adjusted.

The second valve part is provided to pressure-block the inside of the cylinder and the first valve part, and when the inside of the cylinder becomes high pressure, the pressure spreads to the first valve body B1 of the first valve part. A so-called outward-opening valve is used to close the second nozzle N2 by force from inside the cylinder.
As shown in Figure (b), 1: The second valve body B2 is supplied with fuel by the spring S2 to the second nozzle N2, which serves as the injection hole for the fuel injected from the first nozzle of the first valve part into the cylinder. It is a normally closed valve that is biased toward the cylinder side, and when the pressure difference between the pressure on the fuel supply side and the cylinder pressure becomes larger than the biasing force of the spring S2, the second valve body B2 is pushed toward the inside of the cylinder. The valve part opens.

When installing a fuel injector configured in this manner in an internal combustion engine, the location must be determined in a series of rooms (the fuel injected from the fuel injector is placed near the electrode of the spark plug as a stratified mixture with high concentration). It is now possible to supply it to internal combustion engines, and it is known that improvements in emissions and fuel efficiency can be achieved.

Furthermore, the action of the second valve part formed in the in-cylinder fuel injection valve prevents the large in-cylinder pressure during the compression stroke from directly reaching the first valve part.

Therefore, there is no need to increase the fuel pressurizing capacity of the fuel supply system more than necessary, and the fuel injection valve can be configured to be small, lightweight, and economical.

(Problems to be Solved by the Invention) However, even with the above-mentioned fuel injection valve for direct injection, it is still not sufficient, and there are the following problems. When a fuel injection valve is actually installed in an internal combustion engine, it is possible to stop the engine after the internal combustion engine is running.
An internal combustion engine that has reached a so-called dead soak condition may not restart properly, and there is a possibility that hunting may occur during restart. Therefore, during dead soaking, they are placed in an extremely harsh thermal environment.

Therefore, even if the fuel supply to the fuel injection valve is resumed when restarting the internal combustion engine after a dead soak, the fuel will be heated and vapor will be generated, making the amount of fuel injected unstable and causing the internal combustion engine to become uncontrollable. Because it will be.

To deal with this, it is possible to modify the fuel injector to improve its insulation performance, but this would only make the in-cylinder fuel injector larger, heavier, and more complex, and would result in a restart. This cannot be said to be an effective means of improving the characteristics of time.

The present invention was made to solve this problem, and is an internal combustion I! This is a fuel injection valve for in-cylinder injection that improves the combustion state of fuel by directly injecting fuel into the cylinder, and is not only compact, lightweight, and economical, but also has excellent restart performance after dead soak. The objective is to provide an excellent fuel injection valve that can reliably improve the performance of fuel injection valves.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has a means (means configured by the present invention) in which the fuel supplied from the companion fuel tank to the fuel supply path is opened and closed as appropriate. In a fuel injection valve for in-cylinder injection that directly injects fuel into a cylinder of an internal combustion engine, an adjacent chamber adjacent to the fuel supply path and formed oil-tightly communicates the adjacent chamber with the inside of the fuel tank. and a fuel circulation path for circulating fuel in the fuel tank to the adjacent chamber.

The gist of the invention is a fuel injection valve for in-cylinder injection, which is characterized by being equipped with.

(Function) A fuel injection valve for in-cylinder injection according to the present invention (component) A fuel circulation path is formed that circulates the fuel pressure-fed from the fuel tank between the adjacent chamber and the fuel tank.Moreover, the adjacent chamber It is formed adjacent to the fuel supply path for injection.

In other words, the fuel that circulates through the new fuel circulation path has the effect of improving the heat dissipation characteristics of the fuel supply path, thereby cooling the fuel flowing through that fuel supply path.

EXAMPLES Hereinafter, in order to explain the present invention more specifically, the present invention will be described in detail by giving examples.

(Example) Fig. 1 shows a fuel injection valve 10 for in-cylinder injection, which is a first example.
FIG. 2 is an even more detailed enlarged view of the fuel injection valve 100.

A piston 3 is slidably fitted into a cylinder bore 12 formed in the cylinder block 11. A cylinder head 14 placed on the cylinder block 11 and a top surface 15 of the cylinder bore 12 and piston 13 form a combustion chamber. 1
6 is formed. Further, a spark plug 22 is fitted into a hole 21 formed in the cylinder head 14 , and its electrode 23 extends into the combustion chamber 16 .

The fuel injection valve 1001t is fitted and supported in a support hole 17 that is vertically bored and communicates with the cylinder head 14 and the Ginonda block 11. A hole 18 that penetrates the cylinder block 11 and reaches the combustion chamber 16 is bored in the deepest part of the support hole 17, and the injection hole [01] which becomes the fuel injection hole of the fuel injection valve 100 is combusted from the hole 18. I am facing room 16.

On the other hand, the fuel stored in the tank 3
[Fuel injection valve (to be described later)] Fuel is directly pumped from the fuel joint pipe 202 of the OO to the bomb 32, and is then passed through the cylindrical part surrounding the normal fuel supply system to the outlet member 1.
21, and is returned to the tank 31 from the pressure regulating valve 34 through the recirculation line 36, like the surplus fuel. Reverse 1: Fuel may be supplied into the fuel injection valve 100 through the outlet member 12 and returned to the tank 31 from the fuel junction vibe 202 via the pressure regulating valve 34.

Next 1 - The detailed configuration of the fuel injection valve 100 will be explained. The fuel injection valve has a length of 100 ft, has a passage in the center for supplying fuel to the combustion chamber 16, or a passage for discharging fuel to the pressure regulating valve 34 side, and is surrounded by a double cylindrical body.

First, the component that becomes the central fuel passage will be explained.

This component layer is further divided into two parts: an upper fuel metering section 110 and a lower fuel injection section 150, which are interconnected and work together to achieve fuel injection into the combustion chamber 16.

Fuel metering section 110 (Table 1) Generally, the configuration is similar to that of a normal fuel injection valve that injects fuel into the intake pipe of an internal combustion engine. That is, a hollow nozzle body forms the lower part of fuel metering section 110. 1] At the lowermost end of the nozzle body 112, there is a hole 112 for ejecting fuel, and a needle valve 113 is slidably built into the hole. are coaxially mounted and integrally fitted into a lower end opening 116 of a casing 115 forming the main body of the fuel metering section 110.

However, the fuel injection valve 700 of this embodiment (, lt, side wall 1 of the nozzle body 111: through hole 1 communicating with the inner cylindrical portion to be described later) 1a is perforated, and the needle valve 113 has a hole from the upper end to the center part. A fuel passage 113a is drilled all the way to the nozzle body 111. A communication hole 1]3b is also formed on the wall of the needle valve 113 to communicate the fuel passage 113a inside the holder with the through hole 111a of the nozzle body 111. With this configuration, the fuel from the through hole 111a side is transferred to the fuel metering section 1.
]0.

The outlet member 121 forming the upper part of the fuel metering section 110 serves as a fuel supply port, and is connected to the pressure regulating valve 34 and fitted into the upper end opening 1 of the casing 15. are considered to be one. A tube member 122 is provided at the axial center of the outlet member 121, and fuel flowing back from the fuel metering section 110 side is guided to a fuel passage 123 in a hollow portion of the tube member 122.

In addition, a needle valve 113 built in the nozzle body 111
An annular member 125 made of a magnetic material is fitted to the upper end. A spring 126 is provided between this annular member 125 and a tube member 22 built in the outlet member 121. The needle valve 113 is always urged downward via the spring 126f and the annular member 125, so that the needle valve 113 is seated on the seat portion 127 formed at the lower part of the nozzle body 1]1, 112 is closed.

On the other hand, a magnetic annular member 1 is attached to the head of the needle valve 113.
25 is fitted, by energizing the solenoid coil 131 installed inside the casing 15, the needle valve 113 is pulled upward against the urging force of the spring 126 and separated from the seat part 127. The aperture hole 112 can be opened.

Therefore, by controlling the energization period to the solenoid coil 131, the amount of fuel injected from the throttle hole 112 can be adjusted. An electronic control unit (hereinafter referred to as ECU) 132 controls this energization period, and applies an exciting current to the solenoid coil 13 only for a period corresponding to the operating state of the engine.
1 is energized.

Next 1: The fuel injection section 150 will be explained.

The holder 151 is a hollow tubular member in which a fuel passage 152 is bored along its axis, and a male threaded portion is threaded on the upper end of the holder 151. The holder 151 communicates with the throttle hole 112 of the fuel metering portion 110 in an oil-tight manner. . The fuel that has passed through this holder 151 (upper) passes through a passage hole drilled in a sealing material 170 that is screwed onto the male thread at the lower end of the holder 151, and reaches the control valve storage chamber 172 provided at the lower part.Control valve storage chamber 172 (Table) An outward-opening control valve 161 (described later) is housed in the fuel passage 1.
A nozzle hole 101 is perforated in a direction perpendicular to 52 and communicates with the combustion chamber 16 .

A more detailed enlarged view of this outward opening type control valve 161 is shown in FIG. Control valve 1611; E, has a funnel-shaped seat member 162 fitted into the opening of the nozzle hole 101, and a valve body 164 that opens and closes a hole 163 bored in the center of the seat member 162.

The valve body 164 of this control valve 161 (the seat member 162
protruding outward from the hole 163 to open the hole 163;
It operates as a so-called outward-opening valve that retreats inward and closes the hole 163.

One end of an upper needle 165 is fixed to the back surface of the valve body 164. A small-diameter fitting portion is formed at the other end of the needle 165, and a retainer 166 and a retainer 166 are fitted into this fitting portion. A spring 1 is inserted between the opening of the sheet member 162 and the opening of the sheet member 162.
67 is provided in an elastically deformed state. Therefore, when no external force is applied, this spring 16
The elastic force of 7 causes the valve body 164 to retreat inward of the seat member 162 and close the gourd hole 163. The fuel pressure in the fuel passage 152, the elastic force of the spring 167, and the combustion chamber 1
When the force becomes greater than the resultant force with the internal pressure of valve body 16
4 protrudes toward the combustion chamber 16 side, and a passage 168 bored in the sheet member 162 communicates with the hole 163, so that fuel is injected.

Furthermore, a seal portion (constructed so as to have the following relationship) formed by the inner circumferential surface of the seat member 162 and the outer circumferential surface of the valve body 164, which performs the main function of closing or opening the hole 163, is provided. has been done.

When the control valve 161 is closed, that is, the valve body 164
is in the position shown in FIG.
and the fuel passage 152. This site is the blocking site S1 shown in FIG. On the other hand, at this time, the combustion chamber]
Seat part 162 on the outermost part 1 of the control valve 161 facing 6
and the valve body 164 so that a slight gap is formed between the valve body 164 and the valve body 164.
A constriction portion S2 is configured. An expanded portion S3 having a larger gap than the restricted portion S2 is formed between the blocking portion S] and the restricted portion S2.

In other words, when the control valve 161 shown in FIG.
A constriction part S2 having a flow path area R of the constriction part S2
A composite seal is constituted by the expansion part S3 having a flow passage area R3()R2) larger than that of the second part, and the blocking part S1 located at the innermost part and having a flow passage area R1 of completely zero.

Next, the double cylindrical body surrounding the fuel passage detailed above will be explained.

To summarize the inner cylinder of the double cylinder, it is a passage that guides the fuel flowing from the fuel junction vibe 202 through the filter 203 to the through hole 11]a.For this reason,
A double cylindrical tube 204 having double side walls is arranged concentrically on the holder 151, and the lower end of the double cylindrical tube 204 is attached to the holder]
51 in an oil-tight manner, and the upper end thereof is oil-tightly fixed to the casing 115 using a first joint sealing material 206. The first joint sealing material 206 has a casing 11
A passage 208 is formed between the passage 20 and
8 through the fuel joint vibe 202 and double cylindrical tube 204
The outer pipe line 210 is in communication with the outer pipe line 210 . In addition, a communication hole 216 is bored at the lower end 1 of the inner wall 214 that separates the outer pipe line 210 and the inner pipe line 212 of the double cylindrical pipe 204. , the upper end of this inner pipe 212 is connected to the nozzle body 111.
and communicates with the through hole 11]a of the nozzle body 111. That is, the fuel supplied from the fuel joining vibe 202 (upper passage 208 and outer pipe line 2) flows downward in the drawing along 0, passes through the communication hole 216, and then reverses direction and flows from the inner pipe line 212 to the nozzle body. It leads to the through hole 111a of 111.When fuel is not injected,
Furthermore, the communication hole 113b of the needle valve 113 and the fuel passage 1
It flows out from the outlet member 121 via 13a. During fuel injection, from the communication hole 113b of the needle valve 113 to the throttle hole 1
12, fuel passage] 52, the control valve 161, and the injection hole 230 to be injected into the combustion chamber 16.

The outer cylindrical body of the double cylindrical body (companion) is mainly composed of a large diameter cylindrical tube 220 with a large diameter that further envelops the double cylindrical tube 204, and a terminal tube 222 having the same diameter as the large diameter cylindrical tube 220.

First, the upper end of the large diameter cylindrical tube 220 is connected to the second joint sealing material 2.
24 is airtightly attached to the double cylindrical tube 204. The lower end of the tag is fitted to the upper end of the sealing material 170 in an airtight manner. Further, an air bonding vibrator 226 is erected on the second bonding sealing material 224, and a passage 226 formed inside
The air junction pipe 226 and the large diameter cylindrical pipe 220 communicate with each other through the pipe 8. Terminal tube 22212. It is fitted to accommodate the lower end of the sealing material 170.
The large diameter cylindrical pipe 22
It communicates with 0. In addition, a sealing material 1 is attached to the terminal pipe 222.
A nozzle hole 230 is formed on the same axis as the nozzle hole 101 drilled in the hole 70 .

Therefore, if compressed air is supplied by connecting the pressurized air source 232 to the air junction pipe 226 as shown in the figure, Ill?
, the injection hole 2 via the large diameter cylindrical pipe 220 and the terminal pipe 222
30 will be formed.

It is clear that the in-cylinder fuel injection valve 100Lt of this embodiment configured as described in detail above has the following excellent effects.

Eleventh: A double cylindrical pipe 204, which is an inner cylinder, is arranged so as to surround the fuel passage 152 that connects the fuel metering section 110 to the control valve 161. For this reason, the double cylindrical tube 2
The fuel passage 152 is cooled by the fuel flowing through 04,
This has the effect of preventing vapor from being generated in the fuel injected into the combustion chamber 16. Therefore, an internal combustion engine equipped with the present fuel injection valve 100 can be started smoothly even when restarted after a dead soak, and the starting characteristics are greatly improved.

Moreover, since the double cylindrical tube 204 has an inner wall 2]4 and is configured to have a longer flow path for cooling fuel, the cooling effect is further increased.

Further, the fuel used for cooling passes through the passage 113a of the needle valve 113 and takes a route to flow out from the outlet member]21. Due to this outflow path, even if a small amount of vapor is generated from the fuel passage 113a of the fuel metering section 110 to the fuel path 123 of the pipe member 122, the vapor will not be pushed upward by the fuel flowing through the outflow path and will not be sent to the exit member 21. and will be carried away.

21st: An air flow path centered around the large-diameter cylindrical pipe 220 is formed. Since the fuel ejected from the nozzle hole 101 and the air are configured to merge, the fuel mist supplied to the combustion chamber 16 The combustion conditions can be further improved. That is, the combustion state in the combustion chamber 16 is improved not only by the stratified air-fuel mixture but also by the promotion of atomization, thereby making it possible to construct a more excellent fuel injection valve for in-cylinder injection.

In addition, since the air 1 passing through the large diameter cylindrical tube 220 flows in contact with the double cylindrical tube 204, which serves as a passage for the cooling fuel, it has the effect of air cooling the double cylindrical tube 204, which is also effective in avoiding vapor. .

31st: Although the control valve 161 is open, fuel is horizontally injected into the fuel chamber 16 through the injection hole 101 and the hole 18. The fuel injected in this way (as the piston 13 rises causes the upward airflow to flow toward the electrode 23 side of the spark plug 22). Then, when the piston 13 rises further, the hole 18 closes.
The spark plug 22 ignites and the mixture explodes. Therefore,
Even if the average air-fuel ratio in the combustion chamber 16 is lean, a good combustion state is ensured, resulting in improved fuel efficiency and reduction of HC and CO in the exhaust gas.

Fourth (mi) Since the fuel injection section 150 is newly provided, the following effects are obtained.Since the fuel injection section 150 is provided between the fuel metering section 110 and the combustion chamber 16, the fuel metering section 110 is installed in the combustion chamber. 16. Therefore, it is not directly affected by the high-temperature, high-pressure gas and particulates generated in the combustion chamber 16 during an explosion, and can be configured to be small, lightweight, and economical. Since the valve 161 is an outward-opening type, the inside of the fuel passage 152 is not affected by the inside of the combustion chamber 16.
Heat deformation of the fuel metering section 110 and contamination by exhaust particles can be prevented.

Furthermore, the seal structure of the control valve 161 used in the fuel injection section] 50 is modified from the combustion chamber 16 side in the closed valve passage to a throttle part S2 having a flow passage area R2, and a flow passage area R3 (>R2).
This is a composite seal consisting of an expansion part S3 having a flow path area R1 of 1, and a blocking part S1 having a flow path area R1 of completely zero. Therefore, it becomes difficult for suspended particles such as carbon and engine oil generated inside the combustion chamber 6 to penetrate further into the sealing part due to the constriction part S2. The suspended objects also absorb kinetic energy due to the rapidly expanding flow path area at the next expansion section S3, and do not reach the innermost blocking section S1. That is, the throttle part S2 and the expansion part S3 formed on the side of the combustion chamber 16 act as a so-called labyrinth seal to prevent the movement of floating objects in the combustion chamber 16, thereby preventing contamination of the blocking part S1. be.

Here, the cutoff portion S 1 +i is a seal portion that determines the effective area of fuel to be injected when the fuel injection portion 150 is opened, and shuts off the combustion chamber 16 and the fuel metering portion 110 when the valve is closed. Therefore, the sealing performance of this shutoff portion S1 directly affects the operating status of the fuel injection valve 100, and if floating matter adheres here (L), the amount of fuel adjusted by the fuel metering portion 110 is It becomes impossible to inject into the combustion chamber 16, or it becomes impossible to ensure the normal operation of the fuel metering section 110.It is impossible to completely prevent contamination of the shutoff section S1, which performs such an important function. Therefore, the fuel injection valve 100 for in-cylinder injection of this embodiment
11 It becomes possible to maintain stable operation over a long period of time, resulting in extremely high reliability.

In addition, a needle 165 is attached to the back surface of the valve body 164 of the control valve 161.
is firmly attached. Therefore, when the control valve 161 is opened and closed, the valve body 164 is guided by the sliding needle 165 and becomes stable in the sliding axis direction. Therefore,
The relationship between the sliding amount of the valve body 164 and the opening area of the hole 163 is always constant, so that a stable fuel flow rate and spray can be obtained.

In addition, in the above embodiment, the nozzle hole 101 is connected to the fuel passage 152.
Although it extends in a direction perpendicular to that, it is not limited thereto, and may be inclined at any angle. example(
The nozzle hole]0] may face diagonally upward or diagonally downward. In addition, the position of the nozzle hole [0] and the direction of fuel injection with respect to the combustion chamber 16 can be freely selected, and are determined as appropriate to obtain the desired stratified mixture according to the characteristics of the engine installed. be done.

Also, instead of the pressurized air source 232, the air junction vibe 22
6 may be communicated with the atmosphere.

Furthermore, the above embodiment is an example in which the fuel injection valve 100 is provided in a reciprocating engine, but instead of this, it is provided in the side housing of a rotary engine, and a hole that is opened and closed by the rotor is formed in the side housing. Fuel injection may be performed from the beginning.

Next (2) Another embodiment of the control valve 161 used in the above-mentioned in-cylinder fuel injection valve 100 will be explained.
This is an enlarged view of the control valve 300 of another embodiment, and corresponds to FIG. 3 above.

As is clear from the figure 1: Since the main parts of the configuration are the same as those of the control valve 161 described above, the explanation of each part is omitted, and the same components are designated by the same reference numerals as those of the control valve 161 and correspond to each other. The relationship is clear.

Control valve 30011 of this embodiment. In the control valve 161, the cylindrical portion of the needle 165 fixed to the back surface of the valve body 164 is chamfered on all four sides.

When the control valve 3001i having the needle 302 shaped like a square prism in this manner is opened, a fuel passage is formed through the gap between the seat member 162 and the needle 302 in addition to the passage 68 bored in the seat member 162. It turns out. Therefore, the passage 168 is not blocked by the movement of the needle 302 to the left in the drawing, and the effective area of the fuel passage increases, making it possible for fuel to flow into the sheet member 62 even more smoothly. For this reason, the sheet member 16
Since pulsations in the fuel pressure passing through the combustion chamber 16 are prevented, fuel injection into the combustion chamber 16 can be achieved in a more stable manner.

Note that in the configuration of the fuel injection valve 100 of the above embodiment (Table 1), an example in which control valves 161, 300 and an air flow path for promoting atomization are separately provided is explained. However, it is not limited to this configuration. It is not necessary to provide a control valve or an air flow path.In addition, the cooling fuel passage and the injection fuel passage are not used in common, and each has its own dedicated circulation path. You can.

Furthermore, in the above embodiment, the structure of the double cylindrical pipe 204, which serves as a passage for the cooling fuel, is divided into an outer pipe line 210 and an inner pipe line 212 in order to forcibly lengthen the fuel flow path length. As shown in FIG. 5, one cooling chamber 400 may be constructed by removing the inner wall 214 of the double cylindrical tube 204. Even in a fuel injection valve having a cooling chamber 400 having such a configuration, warm fuel flows upward due to natural convection of the fuel and flows out to the outside of the fuel injection valve, so the same level of fuel cooling effect as described above is expected. Ru. Moreover, by configuring in this way, the configuration of the double cylindrical pipe 204 and the configuration of the seal portion are simplified, and the fuel injection valve can be configured more economically.

Effects of the Invention As described above in detail with reference to embodiments, the fuel injection valve for in-cylinder injection of the present invention has an adjacent chamber in the fuel supply passage which serves as a passage for fuel supplied to the cylinders of an internal combustion engine. This is to circulate the fuel in the fuel tank into the chamber.

Therefore, the fuel injection valve has a lightweight and economical structure that injects fuel directly into the cylinder of the internal combustion engine, and not only improves the combustion state of the fuel, but also supplies fuel to the internal combustion engine using fuel in the adjacent chamber. can be cooled. Therefore, no vapor is generated in the fuel, and starting performance can be reliably improved even in harsh environments such as restarting after a dead soak.

[Brief explanation of the drawing]

Figure 1 is an enlarged view of the main parts of an internal combustion engine equipped with the in-cylinder fuel injection valve of the first embodiment. Figure 2 is an enlarged view of the fuel injection valve. Figure 3 is an enlarged view of the control valve. The figure is an enlarged view of the control valve of another embodiment. Figure 5 is an enlarged view of the fuel injection valve for direct injection of the second embodiment. The figure shows a doctor explaining the control valves used. 100...Fuel injection valve 150...Fuel injection part 165...Needle 214...Inner wall 400...Cooling chamber 110...Fuel metering part 161.300...Control valve 204... Double cylindrical tube 220...Large diameter cylindrical tube

Claims (1)

[Scope of Claims] 1. A fuel injection valve for in-cylinder injection that injects fuel supplied from a fuel tank to a fuel supply passage directly into a cylinder of an internal combustion engine by appropriately opening and closing the fuel supply passage, comprising: An adjacent chamber that is adjacent to the supply path and formed in an oil-tight manner; and a fuel circulation path that communicates between the adjacent chamber and the inside of the fuel tank and circulates the fuel in the fuel tank to the adjacent chamber. A fuel injection valve for in-cylinder injection characterized by: