JP2000073774A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To generate a swirl effectively by a swirl control valve(SCV) as well as to reduce the intake air resistance when an intake air passage is branched. SOLUTION: A branch wall 56 to branch an intake manifold passage 14 into a first and second branch intake manifold passages 14-1 and 14-2 is provided to an intake manifold 6, and the passage section form of a first SCV passage 12-1 in an SCV unit 8 is formed in a circular form, while the passage section form of a second SCV passage 12-2 is formed in an elliptic form. A branch wall with a taper form section toward the upstream side where the passage is branched into the first and the second SCV passages is provided in the SCV unit 8. Furthermore, a branching wall with a taper form section to branch the placing member passage of a placing member between the intake manifold and the SCV unit into the first and the second placing member passages is provided in the placing member. Furthermore, a branch auxiliary member with the taper form section is installed at the upstream side end of the branching wall in the SCV unit.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake system for an internal combustion engine, and more particularly to an internal combustion system capable of reducing intake air resistance when an intake passage is branched and effectively generating swirl by a swirl control valve unit. The present invention relates to an intake device for an engine.

[0002]

2. Description of the Related Art In an internal combustion engine, particularly an automobile internal combustion engine, an intake manifold is mounted on a cylinder head, and an intake port of the cylinder head communicates with an intake manifold passage of the intake manifold to form an intake passage.

[0003] In some of the internal combustion engines, a swirl control valve (also referred to as "SCV") unit is interposed between a cylinder head and an intake manifold.

[0004] As an intake device for the internal combustion engine, there is one disclosed in Japanese Patent Application Laid-Open No. H5-180091. The engine cylinder head structure disclosed in this publication is provided with an EGR mechanism that supplies a part of the exhaust gas in the exhaust port as EGR gas to the intake system of each cylinder, and provides an EGR mechanism between the intake manifold flange and the shutter valve body. A volume portion is provided near the contact portion, and a partition wall for dividing the volume portion into upper and lower compartments is provided in the volume portion so as to leave a communication portion between the two compartments. Then, in the lower compartment of the volume,
EGR gas is supplied from the EGR supply passage, EGR gas is supplied to the first branch intake passage of each cylinder through the communication passage from the upper chamber of the volume, and the first EGR supply passage is arranged in parallel with the oil supply passage, By cooling the EGR gas with oil, the distribution of the EGR gas to each cylinder is made uniform and the rise in intake air temperature due to the introduction of the EGR gas is reduced.

[0005] Also, there is one disclosed in JP-A-6-117260. The engine intake device disclosed in this publication is provided with two intake ports, a primary port and a secondary port for each cylinder, and an intake device for an engine in which an intake control valve is provided in an intake pipe on a secondary port side. The intake control valve is connected to the valve drive shaft by passing the valve drive shaft through the intake pipe on the side, and the intake pipe on the primary port side is arranged away from the valve drive shaft, and the intake resistance of the intake control valve in the engine intake device Is smaller.

[0006] Furthermore, there is one disclosed in Japanese Patent Application Laid-Open No. 7-229424. An engine intake control device disclosed in this publication is an engine intake control device including an intake control valve for variably controlling an intake passage area in an intake passage connected to a plurality of intake valve openings. The second control is defined by a second passage connected to the intake valve opening of the portion and a first passage connected to the remaining intake valve openings, and the second passage is fully closed at a low intake air amount and fully opened at a high intake air amount. A first control valve that closes the first passage in a state where only the top wall or the outer wall side of the first passage is open when the intake air amount is low and fully opens when the intake air amount is high; The tumble or swirl is more reliably generated without increasing the number of tumbles.

[0007] Further, there is another one disclosed in Japanese Patent Application Laid-Open No. 8-177759. An intake manifold for an internal combustion engine disclosed in this publication has an intake manifold having an adhesive structure of upper and lower two-part members, and upper and lower two-part members attached to the split surfaces of both outer walls. Welding and non-adhesion at the dividing surface of the central partition wall by abutting or leaving a gap, and the height dimension of the partition wall does not require high-precision dimension control, and the partition wall is not required for vibration welding. Thickness is not required, and the thickness is reduced to make the intake manifold more compact.

[0008] Japanese Patent Application Laid-Open No. 9-189271 discloses another example. An intake manifold for an engine disclosed in this publication is a resin intake manifold for an engine in which a low-speed branch that guides intake air with a smaller passage cross-sectional area than a high-speed branch is formed outside a curved portion of the high-speed branch. It is divided into an upper manifold made of synthetic resin and a side plate, etc., and the divided surfaces that are welded to each other are formed facing the low-speed branch to ensure sufficient strength.

[0009] Furthermore, there is one disclosed in Japanese Utility Model Laid-Open Publication No. 6-34162. In the intake device of the two-valve internal combustion engine disclosed in this publication, intake ports for both intake valves provided in one cylinder are opened on the side surface of the cylinder head, while the side surface of the cylinder head is opened from the air cleaner. In the intake device in which a branch pipe that branches the intake pipe into two intake ports is joined, in the branch pipe, one path communicating with the intake pipe is branched into two paths that communicate with both intake ports. Is formed separately from the branch pipe, and the branch partition is mounted in the branch pipe.

Further, Japanese Patent Application Laid-Open No. 61-187524 discloses an intake device for an internal combustion engine.

[0011]

In the conventional intake system for an internal combustion engine, the intake passage extending from the surge tank of the intake manifold to the combustion chamber of the cylinder head, namely, the intake manifold passage in the intake manifold and the intake passage in the cylinder head. The intake passage has one passage per cylinder and one intake valve per cylinder.

When the number of intake valves per cylinder is two or more, for example, two, as shown in FIG. 18, the intake port 110 is connected to the first and second intake ports 110-1 and 110-1.
0-2, and the first and second intake ports 11
0-1 and 110-2 are connected to a combustion chamber (not shown).

Further, as shown in FIG. 19, in a conventional internal combustion engine 202 having a swirl control valve unit 208 interposed between the cylinder head 204 and the intake manifold 206, an intake manifold passage 214 is formed in the intake manifold 206. It does not have a branch wall that branches into two passages.

At this time, the swirl control
A branch wall portion 256 is formed in the valve unit 208.

As a result, when the internal combustion engine is driven, FIG.
As shown in FIG. 21, the boundary layer of the intake air expands so as to avoid the wall surface 256 a located on the upstream side of the branch wall portion 256, and the swirl control in the swirl control valve unit 208 is caused by the expansion of the boundary layer. A valve passage (hereinafter referred to as “SCV passage”) 212
Of the first and second SCV passages 212-1 and 212-2 are smaller, and the first and second SCV passages 21-1 and 212-2 are smaller.
The actual passage area of 2-1 and 212-2 decreases and the passage resistance increases, which is disadvantageous in practical use.

[0016]

SUMMARY OF THE INVENTION In order to solve the above-mentioned disadvantages, the present invention provides an intake two-valve internal combustion engine having two intake valves per cylinder and a cylinder head of the internal combustion engine. In the intake system of an internal combustion engine having a swirl control valve unit interposed between the intake manifold and the intake manifold, a part of the intake manifold passage in the intake manifold is divided into first and second branch intakes in accordance with the number of intake valves per cylinder. A first and a second swirl control valve independent of each other are provided in the intake manifold and a branch wall branching into a manifold passage is provided in the swirl control valve unit and communicates with the first and second branch intake manifold passages. A passage is provided to form a circular cross section of the first swirl control valve passage. 2 swirl control valve passage of the passage cross section, characterized in that formed in an oval shape.

Further, an internal combustion engine of an intake two-valve type having two intake valves per cylinder is provided, and a swirl control valve unit is interposed between a cylinder head of the internal combustion engine and an intake manifold. In the intake device, the first and second independent swirl control valve passages in the swirl control valve unit are made to match the number of intake valves per cylinder.
A branch wall having a tapered cross section toward the upstream side branching into the swirl control valve passage is formed in the swirl control valve passage.
It is provided in the control valve unit.

Further, an internal combustion engine of an intake two-valve type having two intake valves per cylinder is provided, and a swirl control valve unit is interposed between a cylinder head of the internal combustion engine and an intake manifold. In the intake device, an interposed member is provided between the intake manifold and the swirl control valve unit, and first and second interposed member passages in the interposed member are provided in accordance with the number of intake valves per cylinder. A branch wall portion having a tapered cross section toward the upstream side branching into the member passage is provided in the interposed member.

Furthermore, the number of intake valves per cylinder is 2
A two-valve internal combustion engine is provided, and a swirl control valve unit is interposed between a cylinder head and an intake manifold of the internal combustion engine to match the number of intake valves per cylinder. The swirl control valve passage inside the swirl control valve unit
A branch wall branching into the second swirl control valve passage is provided in the swirl control valve unit, and an upstream end of the branch wall in the swirl control valve unit is directed toward the upstream side. A branch assisting member having a tapered cross section and a cap shape is mounted.

[0020]

BEST MODE FOR CARRYING OUT THE INVENTION
By a branch wall provided in the intake manifold, a part of the intake manifold passage in the intake manifold is branched into the first and second intake manifold passages, and the intake air resistance at the time of branching is reduced as compared with the conventional one. In addition, the swirl is effectively generated by forming the cross-sectional shape of the second swirl control valve passage into an oval shape.

The swirl control valve passage in the swirl control valve unit is independent of the first and second passages by a branch wall portion provided in the swirl control valve unit and having a tapered cross section toward the upstream side. It is branched into a two-swirl control valve passage, and the intake air resistance at the time of branching is reduced as compared with the conventional one.

Further, the interposed member passage in the interposed member is branched into the first and second interposed member passages by a branch wall provided in the interposed member between the intake manifold and the swirl control valve unit. And at the same time, the intake air resistance at the time of branching is reduced as compared with the conventional one.

Further, a cap-shaped branch auxiliary member having a tapered cross section toward the upstream side provided at the upstream end of the branch wall in the swirl control valve unit is provided with an intake manifold and a swirl control valve.
There is no need to deform the valve unit at all, and there is no fear that the configuration will be unnecessarily complicated, the production is easy, the cost is kept low, and the work of attaching the branching auxiliary member is simplified.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIGS. 1 to 14 show an embodiment of the present invention.

In FIGS. 1, 7, and 9, 2 is an internal combustion engine, 4 is a syringe head, and 6 is an intake manifold.

The internal combustion engine 2 includes a cylinder block (not shown), a cylinder head 4 mounted on the upper surface of the cylinder block, a cylinder head cover mounted on the upper surface of the cylinder head 4, and a lower surface of the cylinder block. And an oil pan (not shown) to be mounted.

The cylinder head 4 of the internal combustion engine 2
A swirl control valve unit 8 is interposed between the intake manifold 6 and the intake port 10 in the cylinder head 4 and a swirl control valve passage in the swirl control valve unit 8 (hereinafter “SCV”).
A passage 16) communicates with an intake manifold passage 14 in the intake manifold 6 to form an intake passage 16.

The intake manifold 6 has an upstream surge tank 2 having a throttle body mounting surface 20 for mounting a throttle body 18, as shown in FIGS.
2 and the swirl control valve unit 8
And a plurality of, for example, three first to third branch pipes 26-1, 26-2, and 26-3 that connect the surge tank 22 and the flange 24 to each other. .

A first reinforcing rib 28-1 is provided on one side of the first branch pipe 26-1.
On the other side of 6-1, the first and second branch pipes 26-1, 2
A second reinforcing rib 28-2 is provided between 6-2 and a third reinforcing rib 28-3 is provided between the second and third branch pipes 26-2 and 26-3.

At this time, the second and third reinforcing ribs 28-2,
The upstream side position of 28-3 is the first and second branch pipes 26-1,
It is located at a substantially central part between the second and third branch pipes 26-2 and 26-3.

7 and 9, reference numeral 30 denotes a first gasket interposed between the cylinder head 4 and the swirl control valve unit 8, and 32 denotes a swirl control valve unit 8 and the intake manifold 6. A second gasket 34 interposed therebetween is a swirl control valve (also referred to as “SCV”) to be described later.
Actuator.

As shown in FIG. 8, the swirl control valve unit 8 has a raised outer peripheral wall portion 36 formed on the back surface, that is, the surface on which the flange portion 24 of the intake manifold 6 is mounted. An SCV passage wall 38 that partitions the SCV passage 12 is formed inside the wall 36.

On the upper surface of the swirl control valve unit 8, an injector mounting seat 40 for mounting an injector (not shown) for directing the fuel toward a combustion chamber (not shown), and a delivery pipe mounting for mounting a delivery pipe (not shown). A boss 42 and an air passage 44 for injector assist are provided respectively, and a lower surface of the swirl control valve unit 8 is
A negative pressure introduction passage 46 is provided, and a one-way valve 48 is provided in the middle of the negative pressure introduction passage 46.

In FIG. 8, reference numeral 50 denotes a first negative pressure tank, 52 denotes a second negative pressure tank, and 54 denotes one of the SCV passages 12, that is, a first SCV passage 12-1 to be described later. Swirl control valve (SC
V ").

In the case where the internal combustion engine 2 has a structure in which the number of intake valves (not shown) per cylinder is two, that is, in the case of an intake two-valve system, the intake port 10 includes first and second intake valves. It is branched into intake ports 10-1 and 10-2.

At this time, the intake manifold passage 14 in the intake manifold 6 is made to correspond to the number of intake valves per cylinder.
Of the first and second branch intake manifold passages 14-1,
A branch wall portion 56 branching into 14-2 is provided in the intake manifold 6, and a first and a second branch intake manifold passage 14- are provided in the swirl control valve unit 8.
The SCV passages 12 communicating with the SCV passages 1 and 14-2, that is, the first and second SCV passages 12-1 and 12 independently of each other.
-2, the cross section of the first SCV passage 12-1 is formed in a circular shape, and the cross section of the second SCV passage 12-2 is formed in an oval shape.

More specifically, in the intake manifold 6,
As shown in FIG. 1, a branch wall portion 56 that is directed from the downstream flange portion 24 to the upstream side is provided, and the branch wall portion 56 is formed to have a tapered cross section toward the upstream side.

As shown in FIG. 1, the intake manifold 6 has an intake manifold passage 14 having a circular cross section on the surge tank 22 side of the intake manifold 6, and a first circular cross section branched by a branch wall portion 56. The branch intake manifold passage 14-1 has a short axis along the direction approaching and separating from the first branch intake manifold passage 14-1, and has the same length as the passage diameter of the first branch intake manifold passage 14-1. Branch intake manifold passage 14 having an oblong cross section having a long axis
-2.

Further, as shown in FIG. 1, the swirl control valve unit 8 includes a first SC having the same cross-sectional shape and communicating with the first branch intake manifold passage 14-1.
V passage 12-1 and the second branch intake manifold passage 1
4-2, the second S having the same cross-sectional shape as the cross-sectional shape and communicating with 4-2
And a CV passage 12-2.

Further, the cylinder head 4 is provided as shown in FIG.
As shown in the figure, a first intake port 10-1 communicating with the first SCV passage 12-1 and a second SCV passage 12-2
And a second intake port 10-2 communicating with the second intake port 10-2.

Here, the passage shape of the intake passage 16 will be described in more detail. The passage shape of the intake passage 16 immediately downstream of the surge tank 22 of the intake manifold 6 is, as shown in FIG. It has become.

Then, as it moves to the downstream side, FIG.
As shown in FIG. 4, the passage shape having a circular cross section gradually increases the center-to-center distance to become an oval cross section (also referred to as a “cocoon shape”), and as shown in FIG. The immediately upstream portion has an elliptical cross section having a size obtained by arranging two first circular cross sections.

The first branch intake manifold passage 14-1 branched by the branch wall portion 56 maintains a circular cross-sectional passage having a passage diameter D1 as shown in FIGS. 11 and 14. Second branch intake manifold passage 14
-2, as shown in FIGS. 11 and 13, a short axis DS along the direction of contact and separation with the first branch intake manifold passage 14-1.
And has a major axis DL having the same length as the passage diameter D1 of the first branch intake manifold passage 14-1.

Further, as shown in FIGS. 1 and 5, the first SCV passage 12-1 is connected to the first branch intake manifold passage 1.
4-1 while maintaining the same cross-sectional shape as the downstream end, the second SCV passage 12-2 is, as shown in FIGS. 1 and 5, a downstream end of the second branch intake manifold passage 14-2. , The cross section of which is the same oval shape.

Further, as shown in FIG. 6, a first intake port 10-1 communicating with the first SCV passage 12-1 is provided.
The passage at the upstream end is formed in a circular cross section,
As shown in FIG. 1, the section is narrowed in a tapered shape so that the section changes from a circular cross section to a small circular cross section as it moves to the downstream side.

As shown in FIG. 6, the second intake port 10-2 communicating with the second SCV passage 12-2 has an upstream end formed with an oval cross section.
As shown in FIG. 1, the cross section is narrowed in a tapered shape so that the cross section changes from an elliptical cross section to a small circular cross section as it shifts to the downstream side.

Reference numeral 58 denotes a combustion chamber formed in the internal combustion engine 2.

Next, the operation will be described.

When the internal combustion engine 2 is driven after the swirl control valve unit 8 is interposed between the cylinder head 4 of the internal combustion engine 2 and the intake manifold 6, a surge tank 22 of the intake manifold 6 is moved from an air cleaner (not shown). The intake air that has reached the intake manifold passage 14
Flow down.

The intake air reaching the branch wall portion 56 is smoothly divided by the branch wall portion 56 having a tapered cross section toward the upstream side, and is divided into the first and second branch intake manifold passages 14-. 1, 14-2 flow down, respectively.

At this time, the first branch intake manifold passage 1
The intake air flowing down 4-1 passes through the first SCV passage 12-1 of the swirl control valve unit 8,
The air reaches the first intake port 10-1 of the intake port 10 and is sucked into the combustion chamber 58.

The second branch intake manifold passage 1
The intake air flowing down 4-2 passes through the second SCV passage 12-2 of the swirl control valve unit 8,
The air reaches the second intake port 10-2 of the intake port 10 and is sucked into the combustion chamber 58.

If the swirl control valve 54 disposed in the middle of the first SCV passage 12-1 of the swirl control valve unit 8 is closed, the effective intake passage 16 has an oval cross section. 2nd SCV
Only the side of the passage 12-2 is provided, and swirl is effectively generated in the combustion chamber 58.

As a result, a part of the intake manifold passage 14 in the intake manifold 6 can be branched into the first and second intake manifold passages 14-1 and 14-2 by the branch wall portion 56, and the conventional structure can be realized. It is possible to reduce the intake air resistance at the time of branching as compared with the conventional one, which is practically advantageous.

Since the second SCV passage 12-2 of the swirl control valve unit 8 is formed to have an oval cross section, the swirl can be generated by using the second SCV passage 12-2 having an oval cross section. Thus, swirl can be generated effectively.

Further, since the branch wall portion 56 is integrally formed inside the intake manifold 6, there is no fear that the structure is unnecessarily complicated, the manufacture is easy, the cost can be maintained at low cost, and the cost is low. It is also advantageous.

Further, the intake manifold 6 has a first branch intake manifold passage 14-having a circular cross-section, which is branched by the intake manifold passage 14 having a circular cross-section and a branch wall 56 on the surge tank 22 side of the intake manifold 6. 1 and the first branch intake manifold passage 14-1 having a short axis along the direction of contact and separation with respect to the first branch intake manifold passage 14-1.
A second branch intake manifold passage 14-2 having a major axis of the same length with respect to the passage diameter of the first passage, and a swirl control valve unit 8 having a first branch intake manifold passage. A first SCV passage 12-1 having the same cross-sectional shape communicating with the second branch intake manifold passage 14-2, and a second SCV passage 12-2 having an elliptical cross-sectional shape having the same cross-sectional shape communicating with the second branch intake manifold passage 14-2; Moreover, the cylinder head 4 is connected to the first intake port 10-1 communicating with the first SCV passage 12-1 and the second SCV passage 1
By having the second intake port 10-2 communicating with 2-2, the cross-sectional shape of the intake passage 16 becomes smooth, the intake air resistance can be reduced, and when the swirl control valve 54 is opened, The intake air can be distributed substantially equally, which is practically advantageous.

It should be noted that the present invention is not limited to the above-described embodiment, and various application modifications are possible.

For example, in the embodiment of the present invention, the branch wall portion 56 is formed in the intake manifold 6 as shown in FIG.
As shown in FIG. 5, a branch wall 64 may be provided in the swirl control valve unit 62.

That is, the cylinder head 4 of the internal combustion engine 2
When the swirl control valve unit 62 is interposed between the swirl control valve unit 62 and the intake manifold 6, the first and second SCV passages 12-1 and 12-2 of the swirl control valve unit 62 are branched as shown in FIG. Branch wall 6
4 and the branch wall portion 64 is formed to have a tapered cross section toward the upstream side.

Then, the SCV passage 12 of the swirl control valve unit 62 can be branched into the first and second SCV passages 12-1 and 12-2 by the branch wall portion 64, and the conventional one can be obtained. In comparison, the intake air resistance at the time of branching can be reduced, which is practically advantageous. Further, in the swirl control valve unit 62, a second SCV formed in an oval cross section is used.
If the passage 12-2 is used, the second SCV having an oblong cross section can be used.
The swirl can be generated effectively by the passage 12-2. Further, since the branch wall portion 64 is integrally formed inside the swirl control valve unit 62, the structure is not likely to be complicated, the production is easy, the cost can be maintained at low cost, and the economy can be reduced. This is also advantageous.

Further, in the embodiment of the present invention and the other first embodiment, the branch wall portion is provided on the intake manifold or the swirl control valve unit. However, as shown in FIG. Interposed member 72 between and swirl control valve unit 8
And a branch wall portion 74 is provided in the interposed member 72.
(SG1).

That is, as shown in FIG. 16, the branch wall portion 74 has a tapered cross section toward the upstream side.
The interposed member passage 7 in the interposed member 72 by the branch wall portion 74
6 branches into first and second interposed member passages 76-1 and 76-2.

Then, the interposed member passage 76 in the interposed member 72 can be branched into the first and second interposed member passages 76-1 and 76-2 by the branch wall portion 74, and the conventional art. It is possible to reduce the intake air resistance at the time of branching as compared with that of the above, which is practically advantageous. Further, by integrally forming the branch wall portion 74 inside the interposition member 72, the intake manifold 6 and the swirl control valve unit 8 can be used without being deformed, and the second SCV passage formed in an oval cross section can be used. If it is used, swirl can be effectively generated by the second SCV passage having an oval cross section, and the structure is not likely to be complicated, the manufacture is easy, and the cost can be maintained at low cost. It is economically advantageous.

Further, as shown in FIG. 17, the swirl control valve passage 12 in the swirl control valve unit 8 is branched into independent first and second swirl control valve passages 12-1 and 12-2. It is also possible to provide a configuration (SG2) in which a branch wall portion 82 is provided, and a branch auxiliary member 84 having a tapered cross section is mounted on the upstream end of the branch wall portion 82 toward the upstream side.

The branch assisting member 84 is provided on a thin interposed member 86 such as a gasket, and protrudes from the thin interposed member 86 toward the intake manifold 6.

Then, the branch assist member 8 formed separately is formed.
4, the intake manifold 6 and the swirl control valve unit 8 do not need to be deformed at all, so that the design can be quickly responded to, and there is no fear that the configuration is unnecessarily complicated. The swirl control valve unit 8 can be efficiently produced by using the second SCV passage formed in an oval cross section, while keeping the cost low and economically advantageous. And the branching auxiliary member 8
The mounting operation of 4 is also simple and practically advantageous.

When the branch assisting member 84 is mounted, the thin-walled intervening member 86 is independently provided without interposing the thin-walled intervening member 86 in the entire region between the intake manifold 6 and the swirl control valve unit 8. It is also possible to interpose only between the first and second swirl control valve passages 12-1 and 12-2 to prevent the branch auxiliary member 84 from falling off.

[0070]

As described in detail above, according to the present invention, an intake two-valve internal combustion engine having two intake valves per cylinder is provided, and a swirl valve is provided between the cylinder head of the internal combustion engine and the intake manifold. In an intake device of an internal combustion engine provided with a control valve unit,
A swirl control valve unit is provided in the intake manifold with a branch wall portion that branches a part of the intake manifold passage in the intake manifold into first and second branch intake manifold passages in accordance with the number of intake valves per cylinder. Independent first and second swirl control valve passages respectively communicating with the first and second branch intake manifold passages are formed, and the first swirl control valve passage is formed in a circular cross-sectional shape. Since the cross-sectional shape of the two-swirl control valve passage is formed into an elliptical shape, a part of the intake manifold passage in the intake manifold can be branched into the first and second intake manifold passages by the branch wall portion. At the same time, the intake air resistance at the time of branching can be reduced as compared with the conventional one, which is practically advantageous. In addition, the second swirl control valve passage of the swirl control valve unit is formed to have an oval cross section, so that when the swirl is generated, the second swirl control valve passage having an oval cross section is used. Thus, swirl can be generated effectively. Further, by providing the branch wall portion inside the intake manifold, the configuration is not likely to be complicated, the production is easy, the cost can be maintained at low cost, and it is economically advantageous.

An intake two-valve internal combustion engine having two intake valves per cylinder is provided, and a swirl control valve unit is interposed between a cylinder head of the internal combustion engine and an intake manifold. In the apparatus, the swirl control valve passage in the swirl control valve unit is divided into independent first and second swirl control valve passages in accordance with the number of intake valves per cylinder. Since the tapered branch wall portion is provided in the swirl control valve unit, the swirl control valve passage of the swirl control valve unit is connected to the first and second swirl control valve passages by the branch wall portion. Can be branched and It is possible to reduce the intake air resistance during branching compared to a practically advantageous. Further, in the swirl control valve unit, if a second swirl control valve passage formed in an oval cross section is used, swirl is effectively provided by the second swirl control valve passage having an oval cross section. Can be generated. Further, by providing the branch wall portion in the swirl control valve unit, there is no fear that the configuration is unnecessarily complicated, and the manufacture is easy.
The cost can be kept low, which is economically advantageous.

Further, an internal combustion engine of an intake two-valve type having two intake valves per cylinder is provided, and a swirl control valve unit is interposed between a cylinder head of the internal combustion engine and an intake manifold. In the intake device, an interposed member is provided between the intake manifold and the swirl control valve unit, and the interposed member passages in the interposed member are matched with the number of intake valves per cylinder by first and second interposed member passages. A branch wall portion having a tapered cross section is provided in the interposed member toward the upstream side, and the interposed member passage in the interposed member is branched into the first and second interposed member passages by the branch wall portion. In addition to this, the intake air resistance at the time of branching can be reduced as compared with the conventional one, which is practically advantageous. Further, by providing the branch wall portion in the interposed member, the intake manifold and the swirl control valve unit can be used without being deformed, and the second swirl control valve passage formed in an oval cross section can be used. If it is used, swirl can be effectively generated by the second swirl control valve passage having an oval cross section, and there is no fear that the configuration is unnecessarily complicated.
The cost can be kept low, which is economically advantageous.

Further, the number of intake valves per cylinder is 2
A two-valve internal combustion engine is provided, and a swirl control valve unit is interposed between a cylinder head and an intake manifold of the internal combustion engine to match the number of intake valves per cylinder. The swirl control valve passage inside the swirl control valve unit
A branch wall branching into the second swirl control valve passage is provided in the swirl control valve unit, and an upstream end of the branch wall in the swirl control valve unit is tapered in cross section toward the upstream side. Since the branching auxiliary member of the shape is attached, by using the branching auxiliary member formed separately, there is no need to deform the intake manifold or swirl control valve unit, and it is possible to respond quickly to design changes, configuration The swirl control valve unit is formed in an oval cross-section, and is easy to manufacture, can be easily manufactured at low cost, and is economically advantageous. If a swirl control valve passage is used, swirl can be generated effectively, and Operation of mounting the auxiliary member is also simple,
It is practically advantageous.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of an intake device for an internal combustion engine showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1;

FIG. 4 is a cross-sectional view taken along line 〓V-〓V of FIG. 1;

FIG. 5 is a sectional view taken along line VV of FIG. 1;

FIG. 6 is a cross-sectional view taken along line V {-V} of FIG.

FIG. 7 is an assembled perspective view of an intake manifold and a swirl control valve unit.

FIG. 8 is a rear view of the swirl control valve unit.

FIG. 9 is a cross-sectional view of the swirl taken along line X-X in FIG.
FIG. 4 is a schematic assembly diagram showing a state in which a control valve unit is interposed between a cylinder head and an intake manifold.

FIG. 10 is a front view of a flange portion of the intake manifold.

11 is a cross-sectional view taken along the line XIII-X} in FIG.

FIG. 12 is a cross-sectional view taken along line XX in FIG.

FIG. 13 is a sectional view taken along the line XIII-X} in FIG. 11;

FIG. 14 is a sectional view taken along line X〓V-X〓V in FIG. 11;

FIG. 15 is a schematic enlarged sectional view showing a swirl control valve unit according to another first embodiment of the present invention in a state where it is interposed between a cylinder head and an intake manifold.

FIG. 16 is a schematic enlarged sectional view showing a swirl control valve unit according to another second embodiment of the present invention, in a state where it is interposed between a cylinder head and an intake manifold.

FIG. 17 is a schematic enlarged sectional view of a branch wall portion of a swirl control valve unit showing another third embodiment of the present invention.

FIG. 18 is a schematic sectional view of an intake device for an internal combustion engine without a swirl control valve unit according to the prior art of the present invention.

FIG. 19 is a schematic sectional view of an intake device for an internal combustion engine having a swirl control valve unit interposed.

FIG. 20 is an enlarged view of a portion XX in FIG.

FIG. 21 is a sectional view taken along line XX {-XX} in FIG. 19;

[Explanation of symbols]

 Reference Signs List 2 internal combustion engine 4 syringe head 6 intake manifold 8 swirl control valve unit 10 intake port 12 swirl control valve passage 14 intake manifold passage 16 intake passage 18 throttle body 22 surge tank 24 flange portion 30 first gasket 32 second gasket 34 Actuator 36 Outer peripheral wall 38 SCV passage wall 40 Injector mounting seat 42 Delivery pipe mounting boss 54 Swirl control valve 56 Branch wall 58 Combustion chamber

Claims (5)

[Claims] An internal combustion engine having an intake two-valve system having two intake valves per cylinder is provided, and a swirl control valve unit is interposed between a cylinder head of the internal combustion engine and an intake manifold. In the intake device, a part of the intake manifold passage in the intake manifold is made first and second in accordance with the number of intake valves per cylinder.
Separate first and second swirlers are provided in the intake manifold for providing a branch wall branching into a second branch intake manifold passage, and communicating with the first and second branch intake manifold passages in the swirl control valve unit. -A control valve passage is provided, wherein the first swirl control valve passage has a circular cross-sectional shape and the second swirl control valve passage has an oval cross-sectional shape. Intake device for an internal combustion engine. 2. An intake system for an internal combustion engine, comprising: an intake manifold passage having a circular cross section on the surge tank side of the intake manifold; a first branch intake manifold passage having a circular cross section branched by a branch wall; and a first branch intake. A second branch intake manifold passage having a short axis along the direction of contact and separation with respect to the manifold passage and having a long axis having the same length as the passage diameter of the first branch intake manifold passage and having an elliptical cross section; An intake manifold is provided, and a first swirl control valve passage having the same cross section and communicating with the first branch intake manifold passage, and a second swirl control valve having the same cross section communicating with the second branch intake manifold passage.
A swirl control valve unit having a valve passage; and a first intake port communicating with the first swirl control valve passage and a second intake port communicating with the second swirl control valve passage. The intake device for an internal combustion engine according to claim 1, further comprising a cylinder head. 3. An internal combustion engine having an intake two-valve internal combustion engine having two intake valves per cylinder and a swirl control valve unit interposed between a cylinder head of the internal combustion engine and an intake manifold. In the intake device, the swirl control valve passage in the swirl control valve unit is branched into independent first and second swirl control valve passages in accordance with the number of intake valves per cylinder. An intake device for an internal combustion engine, wherein a branch wall having a tapered cross section is provided in the swirl control valve unit. 4. An internal combustion engine having an intake two-valve internal combustion engine having two intake valves per cylinder and a swirl control valve unit interposed between a cylinder head of the internal combustion engine and an intake manifold. In the intake device, an interposed member is provided between the intake manifold and the swirl control valve unit, and first and second interposed member passages in the interposed member are provided in accordance with the number of intake valves per cylinder. An intake device for an internal combustion engine, wherein a branch wall section having a tapered cross section toward an upstream side branching into a member passage is provided in the interposed member. 5. An internal combustion engine having an intake two-valve internal combustion engine having two intake valves per cylinder and having a swirl control valve unit interposed between a cylinder head and an intake manifold of the internal combustion engine. In the intake device, a branch wall portion that branches the swirl control valve passage in the swirl control valve unit into independent first and second swirl control valve passages in accordance with the number of intake valves per cylinder is provided. An internal combustion engine provided in a swirl control valve unit, wherein a branching auxiliary member having a tapered cross section toward the upstream side is attached to an upstream end of a branch wall portion in the swirl control valve unit. Engine intake device.