JP2003056350A - Cylinder injection type internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cylinder injection type internal combustion engine exhibiting excellent deposit adhesion restraining efficiency. SOLUTION: This cylinder injection type internal combustion engine 1 is provided with a fuel injection valve 2 having an injection hole 20 for injecting fuel; and a cylinder head 3 forming a valve insertion hole 35 to which the fuel injection valve 2 is inserted, a combustion chamber 31 for burning the fuel, and an intake port 32 opened to the combustion chamber 31 so as to introduce the intake air, and having an intake valve 320 for partitioning the combustion chamber 31 and the intake port 32 in a manner of freely opening and closing. Further, intake flow guide means 21, 22, 350, 351, and 36 are provided for guiding the flow of the intake air introduced from an opening end 322 of the intake port 32 to the injection hole 20.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder injection type internal combustion engine mounted on an automobile or the like for injecting fuel directly into a combustion chamber.

[0002]

2. Description of the Related Art In a cylinder injection type internal combustion engine, a fuel injection valve is inserted in a combustion chamber. Then, the fuel is directly injected and supplied from the injection hole of the fuel injection valve to the combustion chamber.
Therefore, the flow rate characteristic and spray characteristic of the fuel in the combustion chamber are determined by the arrangement, orientation, hole diameter, number, etc. of the injection holes.

By the way, there are cases in which a small amount of foreign substances such as oil, additives, and moisture are present in the fuel injected from the injection holes. In this case, these foreign matters become deposits called deposits and gradually adhere to the injection holes.
If the deposit adheres to the injection hole, the diameter of the injection hole may be reduced or the direction of the injection hole may be changed. Therefore, the flow rate characteristic and the spray characteristic of the fuel injected from the injection hole may change. In order to suppress deposit adhesion, it is effective to keep the surface temperature of the injection hole low.

Therefore, the United States P
In Patent No. 6158410, the surface temperature of the injection hole is kept low by applying the mixed air flow in the combustion chamber to the injection hole. FIG. 20 shows a piston-direction sectional view of a cylinder injection internal combustion engine described in the publication. As shown in the figure, a piston 102 is reciprocally slidably inserted into a cylinder bore 101 of a cylinder block 100.
A cylinder head 103 is arranged above the cylinder block 100. A recess 104 is formed on the lower surface of the cylinder head 103. A combustion chamber 105 is formed by being surrounded by the recess 104 and the piston head 112 of the piston 102. The cylinder head 103 has an intake port 106 connected to the combustion chamber 105.
And an exhaust port 107 are formed. The combustion chamber 105 and the intake port 106 are partitioned by an intake valve 108. Further, the combustion chamber 105 and the exhaust port 107
Are separated by an exhaust valve 109. A spark plug 110 is inserted in the combustion chamber 105. Further, below the opening end of the exhaust port 107 of the combustion chamber 105,
The fuel injection valve 111 is inserted.

As shown in the figure, the piston head 112 has a concave shape. Due to the shape effect of the piston head 112 and the recess 104 of the cylinder head 103, the air-fuel mixture circulates in the combustion chamber 105 as a tumble flow as shown by an arrow in the drawing during the compression stroke. By applying the tumble flow to the injection hole 113 of the fuel injection valve 111, the deposit is suppressed in this publication.

Further, in another embodiment of the present publication, a swirl flow of the air-fuel mixture is applied to the injection hole of the fuel injection valve to suppress deposit adhesion.

[0007]

However, the flow velocity of the tumble flow or swirl flow of the air-fuel mixture circulating in the combustion chamber is relatively low. Therefore, the effect of cooling the injection holes, that is, the effect of suppressing deposit adhesion, was not at a sufficiently satisfactory level.

The direct injection internal combustion engine of the present invention has been completed in view of the above problems. Therefore, an object of the present invention is to provide an in-cylinder injection type internal combustion engine having a high injection hole cooling effect, that is, a high deposit adhesion suppressing effect.

[0009]

(1) In order to solve the above problems, in a cylinder injection type internal combustion engine of the present invention, a fuel injection valve having an injection hole for injecting fuel and a fuel injection valve are inserted. A cylinder head having a valve insertion hole, a combustion chamber for burning the fuel, and an intake port opening to the combustion chamber for introducing intake air, and having an intake valve for partitioning the combustion chamber and the intake port into an openable and closable manner. The in-cylinder injection internal combustion engine is characterized by further comprising intake flow guide means for guiding the flow of intake air introduced from the opening end of the intake port to the injection hole.

That is, the in-cylinder injection type internal combustion engine of the present invention is provided with the intake flow guide means for guiding the intake flow flowing from the opening end of the intake port to the injection hole of the fuel injection valve.

According to the cylinder injection type internal combustion engine of the present invention, the injection hole can be cooled by the intake air flow. The intake flow has a higher flow velocity than the tumble flow and swirl flow of the air-fuel mixture. Therefore, the in-cylinder injection type internal combustion engine of the present invention has a high effect of cooling the injection holes, that is, an effect of suppressing deposit adhesion.

(2) Preferably, the intake flow guide means is an injection hole projecting means for projecting the injection hole into the combustion chamber. When the injection hole is arranged so as to project into the combustion chamber, the intake air flow is likely to hit the injection hole. Therefore, according to this configuration, a high deposit adhesion suppressing effect can be obtained by a relatively simple method of providing the injection holes. The injection hole projecting means in this configuration is not particularly limited. For example, the inner peripheral surface of the valve insertion hole and the outer peripheral surface of the fuel injection valve may be tapered, and both surfaces may be brought into contact with each other to project the injection hole in the combustion chamber. Further, a step may be provided on the inner peripheral surface of the valve insertion hole and the outer peripheral surface of the fuel injection valve, and the injection hole may be projected in the combustion chamber by engaging these steps.

(3) Preferably, the intake flow guide means is an intake flow guide collar arranged between the intake port and the injection hole. That is, in this structure, the intake flow guide collar for guiding the intake flow from the intake port to the injection hole is arranged. According to this configuration, the effect of suppressing deposit adhesion can be further improved.

Here, the intake flow guide collar may guide the flow of the intake air that is diffused into the injection hole and is concentrated in the injection hole. Further, the intake flow guide collar may block the flow of intake air moving away from the injection hole. The location of the intake flow guide collar may be, for example, the intake port, the intake valve, or the combustion chamber.

(4) In the above configuration (3), preferably, the intake flow guide collar is a combustion chamber collar installed upright on the periphery of the open end of the combustion chamber. In other words, in this structure, the combustion chamber collar that guides the intake air flow to the injection hole is provided upright on the peripheral edge of the opening end of the intake port. According to this configuration, the flow direction of the intake flow can be corrected to the injection hole direction before the intake flow flowing into the combustion chamber from the intake port diffuses into the combustion chamber. Therefore, the intake air flow can be efficiently guided to the injection holes.

Here, there is no particular limitation on the location at the open end of the combustion chamber collar. Further, it is not necessary to dispose all around the opening end. For example, a combustion chamber collar may be provided upright on the peripheral edge of the open end opposite to the injection hole. In this case, the combustion chamber collar has a role of blocking the flow of intake air moving away from the injection hole and directing this flow toward the injection hole. Further, for example, a 270 ° arc-shaped combustion chamber brim may be provided upright at the opening end, which is lacking only in the vicinity of the injection hole. In this case, the combustion chamber collar has a role of blocking the flow of intake air moving away from the injection holes. Further, it has a role of concentrating the flow of the intake air approaching the injection hole while diffusing into the injection hole.

(5) Preferably, in the structure of (4), the combustion chamber collar further has a communication hole that linearly connects the opening end and the injection hole. That is, in this structure, the combustion chamber flange is intentionally provided so as to block the opening end of the intake port and the injection hole, and the communication hole which connects the opening end and the injection hole is formed in the combustion chamber flange. According to this configuration, since the intake air flow is guided to the injection hole through the communication hole, the intake air flow is less likely to diffuse. Therefore, the effect of cooling the injection holes is high. Therefore, according to this configuration, a higher deposit adhesion suppressing effect can be obtained.

(6) Preferably, in the above configuration (3), the intake flow guide collar is a valve collar installed upright on the valve head of the intake valve. That is, in this structure, the intake flow guide collar is provided in the valve head of the intake valve. With this structure, a high deposit adhesion suppressing effect can be obtained as in the case of the combustion chamber collar.

Further, in the combustion chamber, for example, in order to improve fuel economy, it is sometimes desired to precisely control the flow direction of the air-fuel mixture. In such a case, if the combustion chamber collar is provided upright in the combustion chamber, the flow of the air-fuel mixture may be restricted by the combustion chamber collar. On the other hand, according to the valve collar of this configuration, there is little risk of restricting the flow of the air-fuel mixture. Therefore, this configuration is suitable when it is desired to precisely control the flow direction of the air-fuel mixture.

In particular, it is preferable that the valve collar is erected on the back side of the valve head with respect to the combustion chamber side. According to this structure, the valve collar does not appear in the combustion chamber. Therefore, the risk of the valve collar restricting the flow of the air-fuel mixture is further reduced.

(7) Preferably, in the configuration of (3) above, the intake flow guide collar is a port collar provided upright on the inner peripheral surface near the opening end of the intake port. That is, in this structure, the intake flow guide collar is provided on the inner peripheral surface near the opening end of the intake port. With this configuration, a high deposit adhesion suppressing effect can be obtained as in the combustion chamber collar and the valve collar.

Further, when the port collar is provided, the deposit can be suppressed without providing the valve collar on the valve which is the movable member. Therefore, the valve shaft is less likely to be eccentric. Further, according to the port collar, it is possible to suppress deposit adhesion without providing the combustion chamber collar in the combustion chamber. Therefore, there is little risk of restricting the flow of the air-fuel mixture in the combustion chamber.

[0023]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments in which the cylinder injection type internal combustion engine of the present invention is embodied for an automobile will be described below.

(1) First Embodiment First, the structure of the cylinder injection type internal combustion engine of the present embodiment will be described. FIG. 1 shows a sectional view in the cylinder bore axial direction of the in-cylinder injection internal combustion engine of the present embodiment. As shown in the figure, the in-cylinder injection type internal combustion engine 1 includes a fuel injection valve 2, a cylinder head 3, a cylinder block 4, a piston 5, and a spark plug 6.
It has and.

The cylinder block 4 has a cylinder bore 40. The piston 5 is reciprocally slidably inserted into the cylinder bore 40. A cylinder head 3 is arranged above the cylinder block 4 so as to close the cylinder bore 40. At a portion of the cylinder head 3 that abuts on the cylinder bore 40, a roof-shaped recess 30 that is recessed upward and opened downward is disposed. And the recess 3
A combustion chamber 31 is defined between 0 and the piston head 50 of the piston 5. In addition, the cylinder head 3 has an intake port 32 and an exhaust port 3 that open to the combustion chamber 31, respectively.
3, a plug insertion hole 34, and a valve insertion hole 35 are formed. Of these, the plug insertion hole 34 is open at the top of the recess 30. The spark plug 6 is inserted into the plug insertion hole 34. Further, the intake port 32 is
It has an opening on one of its two side slopes. Two intake ports 32 are juxtaposed in the direction from the front surface to the back surface in the figure. The intake port 32 and the combustion chamber 31 are
The disk-shaped valve head 321 of the intake valve 320 is partitioned so as to be openable and closable. Further, the exhaust port 33 is opened on the other side of the two side slopes of the recess 30 that faces the open side of the intake port 32. Two exhaust ports 33 are also juxtaposed in the direction from the front surface to the back surface in the figure. The exhaust port 33 and the combustion chamber 31 are partitioned by a disc-shaped valve head 331 of the exhaust valve 330 so as to be openable and closable. Further, the valve insertion hole 35 is
On one surface of the side slope of the recess 30, an opening is formed close to the intake port 32. The fuel injection valve 2 is inserted into the valve insertion hole 35.

Next, the characteristic portion of the cylinder injection type internal combustion engine of this embodiment will be described. A characteristic part of this in-cylinder injection type internal combustion engine is that the injection hole 20 formed at the tip of the fuel injection valve 2 is provided in the combustion chamber 31 in a protruding manner. Further, a characteristic portion of this in-cylinder injection internal combustion engine is that a combustion chamber collar 36 is provided upright at the open end 322 of the intake port 32 of the combustion chamber 31. The combustion chamber collar 36 has an open end 32.
2 is that a communication hole 360 that linearly communicates the injection hole 20 with the injection hole 20 is formed.

An outer peripheral surface step portion 21 and an outer peripheral surface taper portion 22 are formed on the outer peripheral surface of the fuel injection valve 2. on the other hand,
On the inner peripheral surface of the valve insertion hole 35, an inner peripheral surface step portion 350 that is symmetrical to the outer peripheral surface step portion 21 and an inner peripheral surface tapered portion 351 that is symmetrical to the outer peripheral surface taper portion 22 are formed. . When the fuel injection valve 2 is inserted into the valve insertion hole 35, the outer peripheral surface step portion 21
And the inner peripheral surface step portion 350 are engaged with each other. At the same time, the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351 contact each other.
Then, the fuel injection valve 2 is held in a state where the injection hole 20 just protrudes into the combustion chamber 31. That is, in the cylinder injection internal combustion engine 1 of the present embodiment, the outer peripheral surface step portion 21
The outer peripheral surface tapered portion 22, the inner peripheral surface stepped portion 350, and the inner peripheral surface tapered portion 351 correspond to the injection hole projecting means of the present invention.

FIG. 2 shows a view seen from the direction A in FIG. As shown in the figure, the combustion chamber collar 36 is erected on a portion of the opening ends 322 of the two intake ports 32 that are close to the injection hole 20. The combustion chamber collar 36 has a communication hole 3 that linearly connects the intake port 32 and the injection hole 20.
60 is formed.

Next, the operation of the cylinder injection type internal combustion engine of this embodiment will be described. FIG. 3 shows a sectional view taken along the line BB of FIG. In the intake stroke, the intake valve 320 opens and the intake flow flows into the combustion chamber 31. At this time, part of the intake flow is
As shown by the outline arrow in the figure, the surface of the injection hole 20 is abutted through the communication hole 360 formed in the combustion chamber collar 36. Due to the intake air flowing in from the communication hole 360, the injection hole 20
The surface temperature of is kept relatively low. Therefore, it is possible to prevent deposits from adhering to the surface of the injection hole 20.

Here, the combustion chamber collar 36 may be erected by, for example, integrally casting with the cylinder head 3. Alternatively, it may be joined to the cylinder head 3 after casting, for example, by welding. The communication hole 360 may be formed at the same time as the combustion chamber collar 36. Alternatively, it may be bored in the combustion chamber collar 36 after being prepared.

In this embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, the inner peripheral surface step portion 350, and the inner peripheral surface taper portion 351 are arranged as the injection hole projecting means. However, the form of the injection hole projecting means is not particularly limited. For example, only the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 may be used. Alternatively, only the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351 may be used.

Further, in this embodiment, the combustion chamber collar 36 is integrally erected between the two intake ports 32 and the injection holes 20. However, the combustion chamber collar 36 may be erected separately for each intake port 32.

(2) Second Embodiment First, the structure of the cylinder injection type internal combustion engine of the present embodiment will be described. FIG. 4 shows a sectional view in the cylinder bore axial direction of the in-cylinder injection internal combustion engine of the present embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the figure, the in-cylinder injection type internal combustion engine 1 includes a fuel injection valve 2, a cylinder head 3, a cylinder block 4, a piston 5 and an ignition plug 6, and the configuration thereof is almost the same as that of the first embodiment. It is the same. Therefore, a detailed description of the structure is omitted.

Next, the characteristic portion of the cylinder injection type internal combustion engine of this embodiment will be described. The characteristic part of this in-cylinder injection type internal combustion engine is that, like the first embodiment, the injection hole 20 formed at the tip of the fuel injection valve 2 is provided in the combustion chamber 31 in a protruding manner. The difference between the present embodiment and the first embodiment is that in the present embodiment, the intake port 32 of the combustion chamber 31.
That is, the combustion chamber brim is not provided upright at the open end 322 of FIG.

When the fuel injection valve 2 is inserted into the valve insertion hole 35, the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 engage with each other. Further, the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351
And abut. Then, the fuel injection valve 2 is held in a state where the injection hole 20 just protrudes into the combustion chamber 31. That is, also in the present embodiment, similarly to the first embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, and the inner peripheral surface step portion 35.
0 and the inner peripheral surface taper portion 351 correspond to the injection hole projecting means of the present invention. FIG. 5 shows a view seen from the direction A in FIG. The members corresponding to those in FIG. 2 are indicated by the same symbols. As shown in the figure, the injection hole 20 is arranged so as to project into the combustion chamber. Further, the combustion chamber brim is not provided at the open end 322 of the intake port 32.

Next, the operation of the cylinder injection type internal combustion engine of this embodiment will be described. FIG. 6 shows a sectional view taken along the line BB of FIG. The members corresponding to those in FIG. 3 are indicated by the same symbols. In the intake stroke, the intake valve 320 opens and the intake flow flows into the combustion chamber 31. At this time, part of the intake flow is
As shown by the white arrow in the figure, it hits the surface of the injection hole 20 projectingly arranged in the combustion chamber 31. Due to this intake flow, the surface temperature of the injection hole 20 is kept relatively low. Therefore, it is possible to prevent deposits from adhering to the surface of the injection hole 20. In the present embodiment, the combustion chamber collar 3
6 is not erected, and the communication hole 360 is not formed. However, since the intake air from the outside directly hits the surface of the injection hole 20, a high cooling effect can be obtained. Moreover, since the structure is simpler than that of the first embodiment, the manufacturing cost is low and the difficulty of processing the member is small.
Therefore, according to the present embodiment, the present invention can be implemented relatively easily.

In this embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, the inner peripheral surface step portion 350, and the inner peripheral surface taper portion 351 are arranged as the injection hole projecting means. However, the form of the injection hole protruding means is not particularly limited. For example, only the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 may be used. Alternatively, only the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351 may be used.

(3) Third Embodiment First, the structure of the cylinder injection type internal combustion engine of the present embodiment will be described. FIG. 7 shows a sectional view in the cylinder bore axial direction of the in-cylinder injection internal combustion engine of the present embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the figure, the in-cylinder injection type internal combustion engine 1 includes a fuel injection valve 2, a cylinder head 3, a cylinder block 4, a piston 5 and an ignition plug 6, and the configuration thereof is almost the same as that of the first embodiment. It is the same. Therefore, a detailed description of the structure is omitted.

Next, the characteristic portion of the cylinder injection type internal combustion engine of this embodiment will be described. The characteristic part of this in-cylinder injection type internal combustion engine is that the injection hole 20 formed at the tip of the fuel injection valve 2 is arranged so as to project into the combustion chamber 31, as in the first embodiment. Also, as in the first embodiment,
The combustion chamber collar 36 is provided upright at the open end 322 of the intake port 32 of the combustion chamber 31. The difference between this embodiment and the first embodiment is that in this embodiment, the combustion chamber collar 3
6 is a point arranged in an arc shape in a portion which is not close to the injection hole 20. In addition, the combustion chamber collar 36 is not provided with a communication hole.

When the fuel injection valve 2 is inserted into the valve insertion hole 35, the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 engage with each other. Further, the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351
And abut. Then, the fuel injection valve 2 is held in a state where the injection hole 20 just protrudes into the combustion chamber 31. That is, also in this embodiment, as in the first embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, and the inner peripheral surface step portion 3 are formed.
50 and the inner peripheral surface taper portion 351 correspond to the injection hole projecting means of the present invention.

FIG. 8 shows a view seen from the direction A in FIG. The members corresponding to those in FIG. 2 are indicated by the same symbols. As shown in the figure, the injection hole 20 is arranged so as to project into the combustion chamber. Further, the combustion chamber collar 36 is arranged in an arc shape in a range exceeding 270 ° which is not close to the injection hole 20 of the opening end 322.

Next, the operation of the cylinder injection type internal combustion engine of this embodiment will be described. FIG. 9 shows a cross-sectional view taken along the line BB of FIG. The members corresponding to those in FIG. 3 are indicated by the same symbols. In the intake stroke, the intake valve 320 opens and the intake flow flows into the combustion chamber 31. At this time, the intake air flow is restricted by the combustion chamber collar 36. That is, for example, from the injection holes 20 to 1
The intake air flow that is trying to move away in the 80 ° direction is blocked by the combustion chamber collar 36, as indicated by the white arrow in the upper part of the figure. Further, for example, the intake air flow, which is trying to approach the injection hole 20 while diffusing, is guided by the combustion chamber collar 36 and changes its direction so as to be concentrated in the injection hole 20 as shown by a white arrow in the lower part of the drawing. In this way, most of the intake air flow flowing into the combustion chamber 31 from the open end 322 hits the injection hole 20. Therefore, according to this embodiment, a relatively high cooling effect can be obtained. Therefore, a high deposit adhesion suppressing effect can be obtained.

Here, the combustion chamber collar 36 may be erected by, for example, integrally casting with the cylinder head 3. Alternatively, it may be joined to the cylinder head 3 after casting, for example, by welding.

In this embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, the inner peripheral surface step portion 350, and the inner peripheral surface taper portion 351 are arranged as the injection hole projecting means. However, the form of the injection hole protruding means is not particularly limited. For example, only the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 may be used. Alternatively, only the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351 may be used.

Further, in the present embodiment, the combustion chamber collar 3
6 is arranged over a range of more than 270 °, the arrangement range of the combustion chamber collar 36 is not particularly limited.

(4) Fourth Embodiment First, the structure of the cylinder injection type internal combustion engine of the present embodiment will be described. FIG. 10 shows a sectional view in the cylinder bore axial direction of the in-cylinder injection internal combustion engine of the present embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the figure,
The in-cylinder injection internal combustion engine 1 includes a fuel injection valve 2, a cylinder head 3, a cylinder block 4, a piston 5 and an ignition plug 6, and the configuration thereof is substantially the same as that of the first embodiment. Therefore, a detailed description of the structure is omitted.

Next, the characteristic portion of the cylinder injection type internal combustion engine of this embodiment will be described. A characteristic part of this in-cylinder injection type internal combustion engine is that a valve collar 323 extending from the peripheral edge of the valve head 321 of the intake valve 320 in the radial expansion direction is provided upright. The difference between this embodiment and the first embodiment is that in this embodiment, the injection hole projecting means is not installed and the injection hole 20 is not arranged so as to project into the combustion chamber 31. Further, in the present embodiment, the combustion chamber collar is not arranged. Further, as described above, in the present embodiment, the valve collar 323 is arranged.

FIG. 11 shows a view seen from the direction A in FIG. The members corresponding to those in FIG. 2 are indicated by the same symbols. As shown in the figure, a valve collar 323 is provided upright in the radial direction in a portion of the peripheral edge of the valve head 321 that is close to the injection hole 20.

Next, the operation of the cylinder injection type internal combustion engine of this embodiment will be described. FIG. 12 shows a BB sectional view of FIG. The members corresponding to those in FIG. 3 are indicated by the same symbols. In the intake stroke, the intake valve 320 opens and the intake flow flows into the combustion chamber 31. This intake air flow flows along the curved surface on the back side of the combustion chamber 31 of the valve head 321. Therefore, the intake air flow flowing in the direction away from the injection hole 20 flows so as to be separated from the inner surface of the combustion chamber 31, as indicated by the upper white arrow in the figure. In this respect, the flow direction of the intake air flowing in the direction approaching the injection hole 20 is corrected by the valve collar 323, as indicated by the lower white arrow in the figure. Therefore, the flow hits the injection holes 20 without being separated from the inner surface of the combustion chamber 31. This intake air flow causes the injection holes 20.
Since the water is cooled, it is possible to suppress deposits from being deposited. According to the present embodiment, since the valve collar 323 is arranged, the injection hole 20 can be cooled without providing the combustion chamber collar. Therefore, there is little risk of restricting the flow of the mixed air flow in the compression stroke. However, the combined use of the valve collar 323 and the combustion chamber collar of the present embodiment is not particularly excluded. When the valve collar 323 and the combustion chamber collar are used together,
It is possible to obtain a higher effect of suppressing deposit adhesion.

Here, the valve collar 323 may be erected by, for example, being integrally formed with the valve head 321. Further, it may be joined to the valve head 321 after fabrication by welding or the like.

Although the injection hole projecting means is not provided in the present embodiment, the injection hole projecting means may be provided and the injection hole may be arranged so as to project into the combustion chamber. According to this mode, the effect of suppressing deposit adhesion is further enhanced.

(5) Fifth Embodiment First, the structure of the cylinder injection type internal combustion engine of the present embodiment will be described. FIG. 13 shows a sectional view in the cylinder bore axial direction of the direct injection internal combustion engine of the present embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the figure,
The in-cylinder injection internal combustion engine 1 includes a fuel injection valve 2, a cylinder head 3, a cylinder block 4, a piston 5 and an ignition plug 6, and the configuration thereof is substantially the same as that of the first embodiment. Therefore, a detailed description of the structure is omitted.

Next, the characteristic portion of the cylinder injection type internal combustion engine of this embodiment will be described. The characteristic part of this in-cylinder injection type internal combustion engine is that the injection hole 20 formed at the tip of the fuel injection valve 2 is arranged so as to project into the combustion chamber 31, as in the first embodiment. Further, on the rear side of the combustion chamber 31 of the valve head 321 of the intake valve 320, the valve collar 3
23 is an upright point. The difference between this embodiment and the first embodiment is that the combustion chamber collar is not arranged in this embodiment. Further, in this embodiment, a valve collar is arranged.

When the fuel injection valve 2 is inserted into the valve insertion hole 35, the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 are engaged with each other. Further, the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351
And abut. Then, the fuel injection valve 2 is held in a state where the injection hole 20 just protrudes into the combustion chamber 31. That is, also in this embodiment, as in the first embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, and the inner peripheral surface step portion 3 are formed.
50 and the inner peripheral surface taper portion 351 correspond to the injection hole projecting means of the present invention.

FIG. 14 shows a view seen from the direction A in FIG. The members corresponding to those in FIG. 2 are indicated by the same symbols. As shown in the figure, a valve collar 323 is provided upright on the rear side of the combustion chamber of the valve head 321. Further, this valve collar 323 is provided with the injection hole 20 of the valve head 321.
It is arranged in an arc shape in a range of more than 270 ° that is not close to.

Next, the operation of the cylinder injection type internal combustion engine of this embodiment will be described. FIG. 15 shows a BB sectional view of FIG. The members corresponding to those in FIG. 3 are indicated by the same symbols. In the intake stroke, the intake valve 320 opens and the intake flow flows into the combustion chamber 31. At this time, the intake flow is restricted by the valve collar 323. That is, for example, the intake air flow that is trying to move away from the injection hole 20 in the direction of 180 ° is blocked by the valve collar 323 as indicated by the white arrow in the upper part of the drawing. Further, for example, the intake air flow that is trying to approach the injection hole 20 while diffusing changes the direction of the flow so that it is guided by the valve collar 323 and concentrated in the injection hole 20 as shown by the white arrow in the lower part of the figure. In this way, most of the intake airflow flowing into the combustion chamber 31 hits the injection holes 20. Therefore, according to the present embodiment, a high deposit adhesion suppressing effect can be obtained. Further, according to the present embodiment, since the valve collar 323 is arranged, the injection hole 20 can be cooled without providing the combustion chamber collar. Therefore, there is little risk of restricting the flow of the mixed air flow in the compression stroke. However, the combined use of the valve collar 323 and the combustion chamber collar of the present embodiment is not particularly excluded. If the valve collar 323 and the combustion chamber collar are used together, a higher deposit adhesion suppressing effect can be obtained.

Here, the valve collar 323 may be erected by, for example, being integrally formed with the valve head 321. Further, it may be joined to the valve head 321 after fabrication by welding or the like.

In this embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, the inner peripheral surface step portion 350, and the inner peripheral surface taper portion 351 are arranged as the injection hole projecting means. However, the form of the injection hole protruding means is not particularly limited. For example, only the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 may be used. Alternatively, only the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351 may be used.

Further, in the present embodiment, the valve collar 3
23 is arranged over the range of more than 270 °, the arrangement range of the valve collar 323 is not particularly limited.

(6) Sixth Embodiment First, the structure of the cylinder injection type internal combustion engine of the present embodiment will be described. FIG. 16 shows a sectional view in the cylinder bore axial direction of the in-cylinder injection internal combustion engine of the present embodiment. The members corresponding to those in FIG. 1 are indicated by the same symbols. As shown in the figure,
The in-cylinder injection internal combustion engine 1 includes a fuel injection valve 2, a cylinder head 3, a cylinder block 4, a piston 5 and an ignition plug 6, and the configuration thereof is substantially the same as that of the first embodiment. Therefore, a detailed description of the structure is omitted.

Next, the characteristic portion of the cylinder injection type internal combustion engine of this embodiment will be described. The characteristic part of this in-cylinder injection type internal combustion engine is that the injection hole 20 formed at the tip of the fuel injection valve 2 is arranged so as to project into the combustion chamber 31, as in the first embodiment. The difference between this embodiment and each of the above embodiments is that the combustion chamber collar and the valve collar are not arranged in this embodiment. Further, in the present embodiment, a port collar 324 extending in the diameter reducing direction is provided upright on the inner peripheral surface near the opening end 322 of the intake port 32.

When the fuel injection valve 2 is inserted into the valve insertion hole 35, the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 engage with each other. Further, the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351
And abut. Then, the fuel injection valve 2 is held in a state where the injection hole 20 just protrudes into the combustion chamber 31. That is, also in this embodiment, as in the first embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, and the inner peripheral surface step portion 3 are formed.
50 and the inner peripheral surface taper portion 351 correspond to the injection hole projecting means of the present invention.

FIG. 17 shows a view seen from the direction A in FIG. The members corresponding to those in FIG. 2 are indicated by the same symbols. As shown in the figure, a port collar 324 is provided upright on the inner peripheral surface of the intake port 32 near the open end 322. Further, the port collar 324 is provided in the injection port 20 of the intake port 32.
It is arranged in an arc shape in a range of more than 270 ° that is not close to.

Next, the operation of the cylinder injection type internal combustion engine of this embodiment will be described. FIG. 18 shows a BB sectional view of FIG. The members corresponding to those in FIG. 3 are indicated by the same symbols. In the intake stroke, the intake valve 320 opens and the intake flow flows into the combustion chamber 31. At this time, the intake flow is restricted by the port collar 324. That is, for example, the intake air flow that is trying to move away from the injection hole 20 in the direction of 180 ° is blocked by the port collar 324 as indicated by the white arrow in the upper part of the drawing. Further, for example, the intake air flow that is trying to approach the injection hole 20 while being diffused changes its direction so that it is guided by the port collar 324 and concentrated on the injection hole 20 as shown by the white arrow in the lower part of the figure. In this way, most of the intake airflow flowing into the combustion chamber 31 hits the injection holes 20. Therefore, according to the present embodiment, a high deposit adhesion suppressing effect can be obtained. Further, according to the present embodiment, since the port collar 324 is arranged, the injection hole 20 can be cooled without providing the combustion chamber collar. Therefore, there is little risk of restricting the flow of the mixed air flow in the compression stroke. Further, according to the present embodiment, since the port collar 324 is arranged, the injection hole 20 can be cooled without providing the valve collar. Therefore, the weight of the valve can be reduced. Further, it is possible to suppress the eccentricity of the valve shaft due to the provision of the valve collar. However, the port collar 32 of the present embodiment
The use of 4 with at least one of the combustion chamber collar and the valve collar is not specifically excluded. Port tsuba 32
When 4 and these tsuba are used together, a higher deposit adhesion suppressing effect can be obtained.

Here, the port collar 324 may be erected by integrally casting with the cylinder head 3, for example. In addition, the intake port 32 of the cylinder head 3 after creation
Alternatively, they may be joined by welding or the like.

In this embodiment, the outer peripheral surface step portion 21, the outer peripheral surface taper portion 22, the inner peripheral surface step portion 350, and the inner peripheral surface taper portion 351 are arranged as the injection hole projecting means. However, the form of the injection hole protruding means is not particularly limited. For example, only the outer peripheral surface step portion 21 and the inner peripheral surface step portion 350 may be used. Alternatively, only the outer peripheral surface tapered portion 22 and the inner peripheral surface tapered portion 351 may be used.

Further, in this embodiment, the port collar 3
Although 24 is arranged over the range of more than 270 °, the range of arrangement of the port collar 324 is not particularly limited.

(7) Other Embodiments The embodiments of the cylinder injection type internal combustion engine of the present invention have been described above. However, the embodiment is not particularly limited to the above embodiment. It can also be implemented in various modifications and improvements that can be made by those skilled in the art.

Further, in the above embodiment, as the intake flow guide means of the present invention, the injection hole projecting means, the combustion chamber flange, the valve flange and the port flange are illustrated, but the intake flow guide means is not limited to these. Not a thing. For example, it is possible to provide an intake flow guide means having a block shape, a rib shape, or a surface configuration integrally continuous with the combustion chamber or the valve instead of the brim shape.
The location of the intake flow guide means is not particularly limited to the location illustrated in the above embodiment.

Further, the above embodiments may be combined and implemented. FIG. 19 shows an enlarged cross-sectional view of the vicinity of the intake valve in a form in which the third embodiment (see FIG. 9) and the fifth embodiment (see FIG. 15) are combined. Note that FIG. 9 and FIG.
Members corresponding to 5 are indicated by the same symbols. According to this embodiment, the valve collar 323 on the upstream side and the combustion chamber collar 36 on the downstream side can regulate the intake air flow. Therefore, the effect of cooling the injection holes 20, that is, the effect of suppressing deposit adhesion is enhanced.

[0071]

According to the present invention, it is possible to provide an in-cylinder injection type internal combustion engine which has a high effect of cooling injection holes, that is, a high effect of suppressing deposit adhesion.

[Brief description of drawings]

FIG. 1 is a sectional view in a cylinder bore axial direction of a cylinder injection internal combustion engine of a first embodiment.

FIG. 2 is a view from A of FIG.

3 is a cross-sectional view taken along the line BB of FIG.

FIG. 4 is a sectional view in the cylinder bore axial direction of a cylinder injection internal combustion engine of a second embodiment.

5 is a view from A in FIG. 4. FIG.

6 is a cross-sectional view taken along the line BB of FIG.

FIG. 7 is a cylinder bore axial direction sectional view of a cylinder injection internal combustion engine of a third embodiment.

8 is an A view of FIG. 7. FIG.

9 is a sectional view taken along line BB of FIG.

FIG. 10 is a sectional view in the cylinder bore axial direction of a cylinder injection internal combustion engine of a fourth embodiment.

11 is a view from A of FIG.

12 is a sectional view taken along line BB of FIG.

FIG. 13 is a cylinder bore axial direction sectional view of a cylinder injection internal combustion engine of a fifth embodiment.

FIG. 14 is a view from A in FIG.

15 is a cross-sectional view taken along the line BB of FIG.

FIG. 16 is a sectional view in the cylinder bore axial direction of a cylinder injection internal combustion engine of a fifth embodiment.

17 is a view from A in FIG.

18 is a sectional view taken along line BB of FIG.

FIG. 19 is an enlarged cross-sectional view around an intake valve of a cylinder injection internal combustion engine of another embodiment.

FIG. 20 is a sectional view in the cylinder bore axial direction of a conventional in-cylinder injection internal combustion engine.

[Explanation of symbols]

1: In-cylinder injection internal combustion engine, 2: Fuel injection valve, 20: Injection hole, 21: Step portion on outer peripheral surface, 22: Tapered portion on outer peripheral surface, 3:
Cylinder head, 30: concave portion, 31: combustion chamber, 32: intake port, 320: intake valve, 321: valve head, 322: open end, 323: valve flange, 324: port flange, 33: exhaust port, 330: exhaust Valve, 33
1: valve head, 34: plug insertion hole, 35: valve insertion hole, 350: inner peripheral surface step portion, 351: inner peripheral surface tapered portion,
36: Combustion chamber collar, 360: communication hole, 4: cylinder block, 40: cylinder bore, 5: piston, 50: piston head, 6: spark plug.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02B 23/10 F02B 23/10 D 31/00 331 31/00 331D 331E F02F 1/42 F02F 1/42 F (72) Inventor Kimitaka Saito 1-1, Showa-cho, Kariya city, Aichi Stock company DENSO F-term (reference) 3G023 AA15 AB03 AC05 AD01 AD05 AD06 AD07 AD10 AD29 3G024 AA04 AA10 AA14 DA01 EA01 FA00 GA32

Claims (7)

[Claims] 1. A fuel injection valve having an injection hole for injecting fuel, a valve insertion hole into which the fuel injection valve is inserted, a combustion chamber for burning the fuel, and an intake port for introducing intake air into the combustion chamber. And a cylinder head having an intake valve that divides the combustion chamber and the intake port so as to be openable and closable,
An in-cylinder injection internal combustion engine comprising: an in-cylinder injection type internal combustion engine further comprising intake flow guide means for guiding a flow of intake air introduced from an opening end of the intake port to the injection hole. Internal combustion engine. 2. The in-cylinder injection internal combustion engine according to claim 1, wherein the intake flow guide means is an injection hole projecting means that projects the injection hole into the combustion chamber. 3. The in-cylinder injection internal combustion engine according to claim 1, wherein the intake flow guide means is an intake flow guide collar arranged between the intake port and the injection hole. 4. The in-cylinder injection internal combustion engine according to claim 3, wherein the intake flow guide collar is a combustion chamber collar installed upright on the periphery of the opening end of the combustion chamber. 5. The cylinder injection internal combustion engine according to claim 4, wherein the combustion chamber collar further has a communication hole that linearly connects the opening end and the injection hole. 6. The in-cylinder injection internal combustion engine according to claim 3, wherein the intake flow guide flange is a valve flange installed upright on a valve head of the intake valve. 7. The in-cylinder injection internal combustion engine according to claim 3, wherein the intake flow guide collar is a port collar erected on an inner peripheral surface near the opening end of the intake port.