JP2003083182A - Variable intake manifold and method of manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the manufacturing cost of a variable intake manifold having the complicated shape. SOLUTION: This variable intake manifold is provided with a chamber part having an intake port 8 communicated with a throttle body 91, plural pipe parts 11 for communicating the inside of the chamber part to each cylinder of a multicylinder internal combustion engine, and a rotary valve 31 for adjusting the air-intake of the pipe parts inserted into the chamber part. The chamber part is formed by joining plural port members 1 respectively composed of the pipe part 11 and a cylindrical part 12 to which one end of the pipe part is connected on its outer wall face.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold for performing variable intake on a multi-cylinder internal combustion engine using, for example, a rotary valve, that is, a variable intake intake manifold, and a manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, a multi-cylinder internal combustion engine (hereinafter referred to as an engine) is provided with an intake manifold that distributes air taken in through a throttle body to each cylinder of the engine.

In such an intake manifold, in order to increase the charging efficiency of intake air and improve the engine output, the intake manifold operates according to the engine speed (variable intake air).
There is an intake manifold using a rotary valve (rotary valve type intake manifold (hereinafter, referred to as RV type intake manifold)). And this RV intake manifold is
In many cases, it is made of resin because of its excellent heat insulating property, light weight, and flexibility in shape.

The intake manifold has a chamber portion having an intake port connected to a throttle body,
It has a plurality of pipe parts which connect the inside of this chamber part and each cylinder of an engine. Therefore, its shape becomes complicated, and it is usually manufactured by a method of dividing into a plurality of divided bodies and joining them in a later step.

Here, the intake manifold manufactured by the conventional method will be described.

JP-A-7-166875 (publication date: June 27, 1995) and JP-A-10-2
Japanese Laid-Open Patent Publication No. 31760 (publication date: September 2, 1998) discloses an opening at one end of a chamber portion which is connected to a throttle body, and a plurality of pipes integrated in series with the chamber portion. There is.

Further, JP-A-10-196373 (publication date: July 28, 1998) and JP-A-10-196373.
No. 0-299591 (Publication date: November 1, 1998)
No. 0) discloses an opening provided in the central portion of the chamber portion which is connected to the throttle body.

Each of the resin intake manifolds disclosed in the above 1 to 3 has a complicated shape. Therefore, it is usually manufactured by using a slide mechanism capable of forming a complicated shape with a small number of divided bodies.

Further, Japanese Unexamined Patent Publication No. 10-89170 (publication date: April 7, 1998) discloses a device manufactured using two cylinders (outer cylinder and inner cylinder). In this intake manifold, as shown in FIG.
A plurality of flange-shaped passage walls (grooves) 103 are provided on the outer periphery of the inner cylinder 102 at regular intervals in the axial direction of the inner cylinder 102.
The outer cylinder 101 is inserted into and fitted to 02, and the groove 103 serves as an intake pipe. Therefore, it is possible to form a complicated shape with a small number of divided bodies.

[0010]

However, the intake manifold disclosed in the above publication has a structure in which a small number of divided bodies are joined by, for example, two divisions or three divisions. Therefore, the size of one divided body becomes large, and the die also becomes large. That is, a large mold with high manufacturing cost is required. Therefore, when the number of intake manifolds manufactured is small, the manufacturing cost increases.

Further, in the manufacturing method using the slide mechanism, since the pipe is provided inside the chamber portion, a partition plate which is a separate component from the mold is incorporated, but the partition plate has a fitting structure. There is a problem that it is complicated and a flat region (a region having a large wall thickness) is formed on the inner wall surface of the pipe portion.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a variable intake intake manifold which can be manufactured at low cost even when the number of manufactured products is small, and the same. It is to provide a manufacturing method.

[0013]

In order to solve the above problems, a variable intake intake manifold according to the present invention has a chamber portion having an intake port connected to a throttle body, the inside of the chamber portion and a multi-cylinder internal combustion engine. Having a plurality of pipe portions that communicate with each cylinder, and the chamber portion is provided with a plurality of chamber openings that communicate with the pipe portions, for each pipe portion,
A rotary valve that selectively communicates the chamber opening is provided for each pipe, and the chamber includes one pipe and one end of the pipe connected to an outer wall surface. It is characterized in that it is configured to include a tubular body formed by joining a plurality of port members each including a tubular portion.

According to the above structure, the chamber portion is a tubular body formed by joining a plurality of port members each including one pipe portion and a tubular portion whose one end is connected to the outer wall surface. It is configured to include. That is, in the variable intake intake manifold, the chamber portion and the pipe portion are divided into the port members. Therefore, the chamber portion and the pipe portion described above can be manufactured by joining the port members formed by using a mold that is small and inexpensive to manufacture.

Therefore, even if the number of products manufactured is small, the die cost can be suppressed and the manufacturing cost of the variable intake intake manifold can be reduced.

Further, by changing the number of port members to be joined, intake manifolds having different numbers of pipe parts can be obtained. Therefore, if the displacement of each cylinder of the engine is substantially the same, the number of cylinders will be different. Variable intake intake manifolds used in engines can be manufactured.

Further, if the port member is used as a common member, it is possible to manufacture a chamber portion of a variable intake intake manifold used in engines having different numbers of cylinders. Therefore, it is possible to reduce the manufacturing costs of a plurality of types of variable intake intake manifolds as a whole.

Further, in the variable intake intake manifold of the present invention, in addition to the above-mentioned structure, the port member is formed by joining a half-divided body which is halved perpendicularly to the axial direction of the tubular portion. Preferably.

According to the above construction, the chamber portion and the pipe portion of the variable intake intake manifold can be molded without using the conventional slide mechanism. Therefore, it is not necessary to use a partition plate having a complicated fitting structure. Accordingly, the cross-sectional shape of the pipe portion in the axial direction can be formed to have a shape with high intake efficiency (for example, a perfect circle shape). Besides, due to the mold shape of this half-split body,
The length and bending method (curvature) of the pipe section can be designed arbitrarily.
That is, the degree of freedom in designing the length and curvature of the pipe portion is improved.

Further, the wall thickness of the half body can be made substantially constant. Therefore, in the cooling process in the process of forming the half-split body,
Since the half body can be cooled uniformly, no distortion or the like occurs. Therefore, a high-quality variable intake intake manifold can be formed. In the conventional shape of the divided body, a thick region (flat region) was formed on the inner wall surface of the pipe portion.

If the cross sections of the pipe parts of both halves are made semicircular, the cross sections of the pipe parts can be made to be perfectly circular when these halves are joined. That is, it becomes possible to form a variable intake intake manifold whose intake efficiency is improved to a theoretical value.

Further, in the variable intake intake manifold of the present invention, in addition to the above configuration, the pipe portion is curved so as to surround the outer wall surface of the chamber portion,
In addition, it is preferable that the curved pipe portion is formed so as to further surround the curved pipe portion.

According to the above construction, for example, even when the pipe portion becomes long due to the characteristics of the engine, the pipe portion is curved so as to surround the outer wall surface of the chamber portion, and It can be arranged further around the curved pipe section. Therefore, the pipe portion can be formed without forming a gap between the pipe portion and the chamber portion, and the variable intake intake manifold can be made more compact.

Further, in the variable intake intake manifold of the present invention, in addition to the above configuration, the rotary valve starts closing one of the chamber openings for each pipe section, and then opens another chamber opening section. It is preferable to provide a valve opening portion for communication.

According to the above arrangement, air can be constantly supplied to the engine even in the process of switching the chamber opening. Therefore, there is no time when air is not supplied to the engine, which is preferable in terms of intake efficiency.

The air flowing from one pipe opening and the air flowing from the other pipe opening have different distances flowing through the pipe. That is, the flow distance of air can be changed (the flow path length can be changed). Therefore, the engine output can be improved by utilizing the intake inertia effect.

The above-mentioned intake inertia effect is an action utilizing the inertia of intake air, and when the intake air from one chamber opening begins to close, the air that has been flowing up to that time is stopped at the chamber opening. Therefore, the pressure increases due to the inertia of air. The high pressure that occurs at that time is the effect of propagating in the pipe as a pressure wave and increasing the pressure near the other chamber opening, forcing air into the engine.

Further, in the variable intake intake manifold of the present invention, in addition to the above configuration, the rotary valve is brought into contact with the inner wall of the chamber section at the valve opening section, and the rotary valve and the inner wall of the chamber section are connected to each other. It is preferable to have a seal member that seals the gap.

According to the above structure, the seal member seals the gap between the rotary valve and the inner wall of the chamber section. Therefore, it is possible to prevent air from leaking from the gap.

Further, the seal member and the inner wall of the chamber portion are in contact with each other. Therefore, the rotary valve makes the inside of the chamber smooth (smooth).
Rotate.

A method of manufacturing a variable intake intake manifold according to the present invention comprises a chamber portion having an intake port connected to a throttle body, and a plurality of pipe portions for communicating the inside of the chamber portion with each cylinder of a multi-cylinder internal combustion engine. A plurality of chamber openings that are provided in the chamber section and communicate with the pipe sections are provided for each pipe section, and a rotary valve that selectively communicates the chamber openings with each pipe section is inserted. In the method of manufacturing a variable intake intake manifold provided, the chamber is formed by joining a plurality of port members each including one pipe portion and a tubular portion whose one end is connected to an outer wall surface. It is characterized by including a chamber portion forming step of forming a portion.

According to the above method, the chamber portion has a tubular body formed by joining a plurality of port members each including one pipe portion and a tubular portion having one end of the pipe portion connected to the outer wall surface. It is a structure that includes. That is, in the variable intake intake manifold, the chamber portion and the pipe portion are divided into the port members. Therefore, according to the above method, the chamber portion and the pipe portion can be manufactured by joining the port member formed by using a mold that is small and inexpensive to manufacture. Therefore, even if the number of products manufactured is small, the die cost can be suppressed and the manufacturing cost of the variable intake intake manifold can be reduced.

Also, by changing the number of port members to be joined, intake manifolds having different numbers of pipe parts can be obtained, so that if the displacement of each cylinder of the engine is substantially the same, the number of cylinders will differ. Variable intake intake manifolds used in engines can be manufactured.

If the above-mentioned port member is used as a common member, it is possible to manufacture a chamber portion of a variable intake intake manifold used in engines having different numbers of cylinders. Therefore, it is possible to reduce the manufacturing costs of a plurality of types of variable intake intake manifolds as a whole.

Further, in the method for manufacturing a variable intake intake manifold according to the present invention, with respect to the axial direction of the tubular portion,
It is preferable that the method further includes a port member forming step of joining the vertically divided halves to form the port member.

According to the above method, the chamber portion and the pipe portion of the variable intake intake manifold can be molded without using the conventional slide mechanism. Therefore, it is not necessary to use a partition plate having a complicated fitting structure. Accordingly, the cross-sectional shape of the pipe portion in the axial direction can be formed to have a shape with high intake efficiency (for example, a perfect circle shape). Besides, due to the mold shape of this half-split body,
The length and bending method (curvature) of the pipe section can be designed arbitrarily.
That is, the degree of freedom in designing the length and curvature of the pipe portion is improved.

Further, the wall thickness of the half-split body can be made substantially constant. Therefore, in the cooling process in the process of forming the half-split body,
Since the half body can be cooled uniformly, no distortion or the like occurs. Therefore, a high-quality variable intake intake manifold can be formed. In the shape of the conventional half-split body, a thick wall region (flat region) was formed on the inner wall surface of the pipe portion.

If the cross sections of the pipe parts of both halves are made semicircular, the cross sections of the pipe parts can be made to be perfectly circular when these halves are joined. That is, it becomes possible to form a variable intake intake manifold whose intake efficiency is improved to a theoretical value.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 shows an in-line 3-cylinder internal combustion engine (hereinafter, referred to as an engine) in which an intake manifold (rotary valve type intake manifold (variable intake intake manifold)) using a rotary valve according to an embodiment of the present invention is used. The case where it inhales is shown.

As shown in FIG. 1, the rotary valve intake manifold (RV intake manifold) is composed of a chamber body 8 (cylindrical body, chamber) and a rotary valve assembly 2.

The chamber body 8 is composed of the port member 1a
1b and 1c, a throttle body mounting pipe member (cylindrical body, chamber portion) 3, a cylinder head mounting plate member 4, an O-ring 5, and a valve cover (chamber portion) 6. The port members 1a to 1c have the same shape, and the port members 1a to 1c have the same shape.
When not distinguished, it is referred to as a port member 1.

The port member 1 includes a tubular portion 12 (cylindrical body, chamber portion) into which the rotary valve assembly 2 is inserted, and a pipe portion 11 that curves along the outer wall of the tubular portion 12 and circulates. It consists of

Pipe member 3 for mounting the throttle body
Is for inhaling air from the throttle body 91. Therefore, the intake port 7 connected to the throttle body 91 is provided at one end of the throttle body mounting pipe member 3.

The cylinder head mounting plate member 4 is a fixing member for mounting the pipe portion 11 and the engine.

The O-ring 5 prevents air leakage (air leakage) from the joint surface between the chamber and the valve cover 6.

The valve cover 6 supports a shaft 37 (described later) of the rotary valve assembly 2 and is joined so as to close one of the openings of the chamber.

Then, the above-mentioned port members 1a, 1b, 1
The tubular portions 12 ... Of c are joined to each other to form a tubular body. The chamber body 8 is provided with the valve cover 6 via the throttle body mounting pipe member 3 at one end of the tubular body and the O-ring 5 at the other end.
Are formed so as to be joined together.

In the present embodiment, "chamber" means a tubular body formed by joining a plurality of the port members 1 to each other, a throttle body mounting pipe member 3, and the tubular body. Is a hollow portion of the chamber main body 8 formed by joining the valve cover 6 that closes one end or both ends of the chamber.

The rotary valve assembly 2 is inserted into the cylindrical body as described above, and has the chamber opening 13a.
3b (described later) is switched. And
The rotary valve assembly 2 includes a rotary valve 31, a seal member 30, a lid member (hub) 36, and a shaft 37.

The rotary valve 31 is a cylindrical rotary valve having a chamber opening 1 provided in the tubular portion 12.
Valve openings (port holes) 35a and 35b for communicating with 3a and 13b are formed. (In Figure 1,
Since there are three port members 1, the rotary valve 31 is formed with a total of six valve openings 35 (35a and 35b)).

The seal member 30 has the valve opening 35.
The a and 35b are brought into contact with the inner wall of the chamber to seal the gap between the rotary valve 31 and the inner wall of the chamber.

The lid member 36 transmits the rotary drive transmitted from an external motor (not shown) via the shaft 37 to the rotary valve 31.

The shaft 37 is fixed so as to project to the center of the lid member 36, that is, the center of a perfect circle, and is rotatably supported by the valve cover 6 described later.

The rotary valve assembly 2 described above is used.
The details regarding this will be described later. In addition, the valve opening 35
The shapes of a and 35b are the same, and when they are not distinguished, they are referred to as valve openings 35.

Now, the port member 1 will be described in detail.

FIG. 2 is an explanatory view of the port member 1. The cross section of the tubular portion 12 is circular. Further, for convenience of explanation, in this figure, the upper side is 12 o'clock, the right side is 3 o'clock, the lower side is 6 o'clock, and the left side is 9 o'clock from the center of the cross section of the tubular portion 12. That is, the description will be given with reference to the position of the dial of the timepiece.

The port member 1 includes the above-mentioned pipe portion 11
Is provided so as to extend from the tubular portion 12 so as to surround the outer wall surface of the tubular portion 12.

The pipe section 11 is connected to each cylinder of an engine (not shown). Further, in FIG. 2, the port member 1 has two chamber openings 13 (13
a ・ 13b) formed. The chamber openings 13a and 13b have the same shape, and when the chamber openings 13a and 13b are not distinguished from each other, they are referred to as chamber openings 13. Further, the number of openings that connect the chamber chamber and the pipe portion 11 may be three or more.

The chamber opening 13a has a cylindrical portion 1
The chamber opening 13b is located in the area around 2 to 3 o'clock to 6 o'clock, and the chamber opening 13b is located in the area from 9 o'clock to 12 o'clock.

The pipe portion 11 has a first partition wall 14 and a second partition wall 15 that separate the pipe portion 11 and the tubular portion 12 from each other except the chamber opening 13. Further, it has a partition wall 16 that separates a low-speed flow path 21 through which air from the chamber opening 13a flows and a high-speed flow path 22 through which air from the chamber opening 13b flows.
As a result, the pipe portion 11 has the low-speed flow passage 21 and the high-speed flow passage 2
2 and a merging channel 23 where the low-speed channel 21 and the high-speed channel 22 merge.

The air flowing through the low speed passage 21 takes a relatively long time to reach the engine, while the air flowing through the high speed passage 22 reaches the engine in a relatively short time.

Further, as shown in FIG.
The length of 1 is such a length as to go around the tubular portion 12 once. However, as shown in FIG. 3, the length of the pipe portion 11 can be extended. Specifically, the pipe portion 11 can be formed so as to be curved so as to surround the outer wall surface of the tubular portion 12, and to be extended so as to further surround the curved pipe portion.

Next, FIGS. 4 to 7 which are sectional views taken along the arrow in FIG.
The above-mentioned first partition wall 14, second partition wall 15, and divided partition wall 16 will be described in detail using. In these figures,
Unless otherwise specified, "top", "bottom", "right", "left"
Represents each position in the drawing.

FIG. 4 is a sectional view taken along the line AB of FIG. As shown in this figure, the pipe portion 11 located on the left side
Is a confluent channel 23 where the low-speed channel 21 and the high-speed channel 22 (see FIG. 2) merge. Then, the second partition wall 15 separates the pipe portion 11 from the tubular portion 12. On the other hand, the pipe portion 11 located on the right side is the low speed flow passage 21. The chamber opening 13a communicates with the pipe 11.

FIG. 5 is a sectional view taken along the line A-C of FIG. As shown in this figure, the pipe portion 11 located on the right side
Is the low-speed flow passage 21. Then, the first partition wall 14 separates the pipe portion 11 and the tubular portion 12.

FIG. 6 is a sectional view taken along the line A-D of FIG. As shown in this figure, the pipe portion 11 located on the right side
Are the low speed flow path 21 and the high speed flow path 22 from the outside. Then, inside the pipe portion 11, divided partition walls 16 (16a, 16b) for separating the low-speed flow passage 21 and the high-speed flow passage 22 are formed. And the division | segmentation partition walls 16a * 16b which protrudes from the inside of the pipe part 11 adjoins, and is integrally formed.

FIG. 7 is a sectional view taken along the line AE of FIG.
As shown in this figure, at the position of the phantom line E that has advanced in the direction of air flow relative to the phantom line D in FIG. 2, the amount of protrusion of the above-mentioned divided partition walls 16a and 16b is small, and the protruding divided partition walls 16a 16b is largely separated.

That is, the direction of air flow (direction of travel)
As the process proceeds to, the partition wall 16a and the partition wall 16b are separated from each other. Then, the low-speed flow passage 21 and the high-speed flow passage 22 join together to form a merged flow passage 23.

Further, at the joining portion of the low-speed flow passage 21 and the high-speed flow passage 22, the cross-sectional shape of the pipe portion 11 positioned in the low-speed flow passage 21 and the pipe portion 11 positioned in the high-speed flow passage 22 are advanced toward the downstream. Is formed while increasing the degree of overlap with the cross-sectional shape of.

Next, the rotary valve assembly 2 (rotary valve 31, seal member 30, lid member 36, shaft 3
7) will be described in detail.

FIG. 8 shows the rotary valve 31. As shown in this figure, the rotary valve 31 has three
Each valve opening 35 (35a, 35b) is provided.

The material for forming the rotary valve 31 is not particularly limited, but a mixed material of polyamide resin (for example, nylon 6, nylon 6-6, etc.) and glass fiber (glass fiber), or aluminum. Is preferably used. In the case of the above mixed material,
The glass fiber content is 20 to 40% by weight, preferably 30 to 35% by weight.

FIG. 9 shows the seal member 30. As shown in this figure, the rotary valve 31 (see FIG. 1)
The number of seal members 30 attached to the port member 1
(See FIG. 1). That is, the same number of seal members 30 as the port members 1 are attached to the rotary valve 31. The plurality of seal members 30 may be combined into one.

FIG. 10 shows one sealing member 30. As shown in this figure, the seal member 30 includes a seal opening portion 32a and 32b and a seal mounting portion 33 (33a and 3a).
3b) and the seal reinforcing portion 34 (34a / 34b). The seal openings 32a and 32b have the same shape, and if the seal openings 32a and 32b are not distinguished, they are referred to as the seal openings 32.

The seal mounting portion 33 is a belt-shaped member as a whole, and has an alphabetical "C" shape so as to sandwich the rotary valve 31 (see FIG. 1).

Then, the seal mounting portion 33 which becomes the outer shape of the belt.
a and a seal mounting portion 33b connecting the seal mounting portion 33a.

The seal opening 32 has a ring shape, is fitted so as to cover the opening end of the valve opening 35 (see FIG. 8), and abuts against the inner wall of the chamber to allow the rotary valve 31 (see FIG. 1). (See) and the inner wall of the chamber is sealed.

The seal opening 32 is disposed along the circumferential direction in the band of the seal mounting portion 33 and is joined to the seal mounting portion 33a.

The seal reinforcing portion 34 is the seal reinforcing portion 34a.
・ It is composed of 34b.

The seal reinforcing portion 34a has the seal opening 32.
The a and 32b are joined together to reinforce.

The seal reinforcing portion 34b is an end portion (seal reinforcing portion 34a) of the seal mounting portion 33b and the seal openings 32a and 32b which are not joined to the seal reinforcing portion 34a.
The joint position and the end portion at the opposite position are joined together to reinforce.

The shape of the seal mounting portion 33 is not limited to the band shape. Further, in the seal opening 32, the side that abuts the chamber is flush with the seal mounting portion 33 and the seal reinforcing portion 34, and the side that fits into the valve opening 35 is the valve opening 35. In order to fit, it is thicker than the seal mounting portion 33 and the seal reinforcing portion 34.

Further, as shown in FIG. 11, a sealing member 30 sandwiching (wrapping) the rotary valve 31.
Applies a force (pressing force) in the direction (arrow P) of pushing the inner wall of the chamber. Then, this pressing brings the seal member 30 and the inner wall of the chamber into contact (seal). In order to obtain the above pressing force, the seal member 30 has a “C” shape which is slightly larger than the outer peripheral size of the rotary valve 31. That is, the pressing force is set by the repulsive force when the slightly larger seal member 30 is inserted into the chamber as described above.

Here, the state in which the seal opening 32 is attached to the valve opening 35 will be described in detail with reference to FIG.

FIG. 12 is an explanatory view showing the state of the chamber opening 13a when the rotary valve 31 fitted with the seal member is inserted into the chamber.
As shown in FIG. 12, when the seal opening 32 is fitted in the valve opening 35, the surface of the seal opening 32 on the chamber opening 13 side is the inner wall of the chamber (the cylindrical portion 1).
2 inner wall). On the other hand, the surface of the seal opening 32 on the rotary valve 31 side is flush with the wall surface of the inner wall of the rotary valve 31. Such a structure is called a valve seal floating structure.
When this valve seal floating structure is used, the gap between the rotary valve 31 and the inner wall of the chamber is sealed, and it is possible to prevent air from leaking from this gap.

The size of the inner circumference of the seal opening 32 may be the same as that of the chamber opening 13. Therefore, the size of the opening of the rotary valve 31 (the opening in which the seal opening 32 is attached to the valve opening 35) and the size of the chamber opening 13 can be made the same.

Further, the seal openings 32a and 32b constituting the seal member have the same shape as the valve opening 35 (for example, if the valve opening 35 is elliptical, the seal openings 32a and 32b are also elliptical). ) Has become a ring.

The material of the seal member is not particularly limited, but a resin having self-lubricating property is preferably used.

Next, referring to FIG. 13, the lid member 36 and the shaft 3
7 will be described.

As shown in this figure, the lid member 36 is attached to the opening of the rotary valve 31. For this attachment, for example, a hole 41 (stopper hole 41) that connects the inner wall and the outer wall of the rotary valve 31 is provided at the end of the rotary valve 31, while the stopper projection 42 is provided on the outer wall of the lid member 36. The rotary valve 31 and the lid member 36 may be attached by fitting these (the stopper hole 41 and the stopper protrusion 42 (hereinafter, these will be referred to as stoppers)).

Since the lid member 36 transmits the rotation,
When attached to the rotary valve 31, it may rotate in the circumferential direction, that is, may be displaced. Therefore, it is preferable to provide a rotation stopper in addition to the stopper hole 41 and the stopper protrusion 42.

The rotation stopper is, for example, a groove (rotation stopper recess 4) provided at an end portion (side surface portion) of the rotary valve 31, which is composed of an inner wall and an outer wall of the rotary valve 31.
3) and a protrusion (rotation stopping protrusion 44) provided on the outer periphery of the lid member 36. And the lid member 3
When 6 is attached to the rotary valve 31, the rotation stopping concave portion 43 and the rotation stopping convex portion 44 are fitted to each other,
It is designed to prevent displacement in the circumferential direction. In addition,
The stopper may also function as a rotation stopper.

The material for forming the lid member 36 is not particularly limited, but a mixed material of polyamide resin and glass fiber, which is one of the materials for forming the rotary valve 31 described above, is preferably used.

The shaft 37 is made of SUS material (stainless steel), and is fixed by insert molding so as to project to the center of the lid member 36, which is a substantially circular disk member, that is, the center of the perfect circle. ing. The method of fixing is not particularly limited.

The rotary valve assembly 2 composed of the above-mentioned members is inserted into the chamber chamber (details will be described later), and is rotated in the chamber chamber by the driving force of the driving means connected to the shaft 37. It is designed to move.

Now, the positional relationship between the chamber opening 13 and the valve opening 35 will be described.

The valve openings 35a and 35b are formed adjacent to each other along the circumference of the rotary valve 31 (see FIG. 1).

The chamber openings 13a and 13b are formed separately on the circumference of the cylindrical portion 12 (see FIG. 2).
For example, the chamber opening 13 is provided at a position where the tubular portion 12 is present.
When a is formed, the chamber opening 13b is formed at a position facing the position.

The chamber opening 13a and the chamber opening 13b are formed so as to be separated from each other by at least one valve opening 35.

On the other hand, at the valve openings 35a and 35b,
The valve opening 35a is formed at a position that does not communicate with the chamber opening 13b when the valve opening 35a is completely in communication with the chamber opening 13a (see FIG. 12). Further, when the rotary valve assembly 2 is rotated to move the valve opening 35a that is in complete communication and starts closing the chamber opening 13a, the chamber opening 13b is placed in a position where it begins to communicate with the valve opening 35b. Has been formed.

As a result, when the rotary valve assembly 2 rotates, the valve opening 35a is completely communicated with the chamber opening 13a (the valve opening 35a and the chamber opening 13a are completely overlapped and coincide with each other). Then, the valve opening 35b and the chamber opening 13
b is closed (the valve opening 35b and the chamber opening 1
3b) and the valve opening 35a (seal opening 32a) partially closes the chamber opening 13a, the valve opening 35b
And the chamber opening 13b partially communicate with each other.

In the above rotation, the valve opening 3
5a communicates only with the chamber opening 13a, and the valve opening 35b communicates only with the chamber opening 13b.
In other words, this rotation causes the valve opening 35a and the chamber opening 13a to communicate with each other and the valve opening 35b.
And the chamber opening 13b communicates with each other.

Next, a method for manufacturing the RV type intake manifold of the present invention will be described.

The port member 1 of the intake manifold constituting the RV intake manifold is shown in FIG.
As shown in FIG. 4, the port member 1 is formed by joining two divided parts (half-divided body 10).

The half-split body 10 is, specifically, the port member 1 divided into two along the imaginary line FF ′ shown in FIGS. 4 to 7. Further, as shown in FIG. 1, the port member 1 is composed of a tubular portion 12 into which the rotary valve assembly 2 is inserted, and a pipe portion 11 that curves around an outer wall of the tubular portion 12 and circulates. Has been done. And, the central axis of the pipe of the pipe portion 11 is the half body 10.
(See FIG. 14) Half plane. The half-split surface is perpendicular to the axis of the tubular portion 12.

The port member 1 may be divided at any position as long as the pipe portion 11 is symmetrically divided, and may not be the position at which the cylindrical portion 12 is symmetrically divided. Further, the cross section of the half-divided pipe portion 11 in the plane perpendicular to the central axis of the pipe is
It is a cross section obtained by dividing a circular pipe in half.

For joining the above-mentioned half-split bodies 10, for example, a groove 51 for molten resin is provided in the joining surface of the half-split bodies 10, and the joining surfaces of the two half-split bodies 10 are aligned with each other. Groove 5
It is performed by pouring a molten resin into 1 and welding the joint surfaces.

In FIGS. 4 to 7, the molten resin groove 51 is used.
The port member 1 is formed by pouring the molten resin into the halves and joining the halves divided along the line FF ′.

Specific examples of the joining method using the molten resin include DSI (Die Slide Injection) method and DRI.
(Die Rotary Injection) method and the like.

The above-mentioned DSI method is disclosed in Japanese Patent Publication No. 2-38377.
This is the method described in Japanese Patent Publication (published date: August 30, 1990). Specifically, one mold is provided with a male mold and a female mold for molding a half-split body obtained by dividing the hollow molded product into two parts, and the other mold is opposed to the male mold and the female mold, respectively. Use a set of dies with female and male dies.

First, a molten resin is injected into a pair of cavities formed between the male mold and the female mold which face each other, and each half body is molded. Next, slide one of the above molds so that the respective half halves left in each female mold face each other, and by matching the above respective dies, the respective half halves are butted against each other. , A method for molding a hollow product in which a molten resin is injected to the peripheral edge of the butting surfaces so that the respective halves are welded to each other.

The DRI method is a method for producing a hollow body described in Japanese Patent Publication No. 7-4830 (published date: January 25, 1995). Specifically, it is a method of producing a hollow body from a step of molding one half-split body, a step of molding the other half-split body, and a step of abutting both half-split bodies.

A pair of molds which are openably and closably combined with each other so that one mold can rotate with respect to the other mold, and each mold has a product molding surface including at least one male mold part and two female mold parts. Use the mold of. In the cavity of the male-female part, one first half body,
A first mold clamping step of injection-molding the other second half body in the cavity of the female-male part and an abutting part of both half bodies in the cavity of the female-female part, and a mold opening step And, the one mold is combined with the other mold by the male part of the one mold being combined with any of the other female mold parts,
The step of rotating or inverting the remaining female mold parts at a predetermined angle so that they are combined with each other, and again, in the cavity of the male-female part, one of the first half halves is used in the cavity of the female-male part. The other second half body, and the first and second molds formed in the first mold clamping step in the cavity of the female-female mold part.
A method for producing a hollow body, characterized by repeating a second mold clamping step of injection molding the abutting portion of the half-split body.

As a method for joining the above-mentioned half-divided bodies, in addition to the joining method using a molten resin, for example, a vibration welding method in which a joining surface is melted by frictional heat and joined can be used. When joining the above-mentioned half-divided body using the vibration welding method, it is not necessary to provide a groove for forming a groove for molten resin in the joining surface of the above-mentioned half-divided body.

As described above, after the port member 1 is formed, the port members 1 are joined together to form the intake manifold. Specifically, as shown in FIGS. 4 to 7, in the center of the joint surface at both ends of the tubular portion 12, the joint convex portion 52 is formed on one side and the joint concave portion 53 is formed on the other side.
They are continuously provided in an annular shape, and they are fitted together when joining the joint surfaces of the adjacent port members 1.

Next, a method of manufacturing the rotary valve 31 of the rotary valve assembly 2 will be described. As described above, for the rotary valve 31, for example, a mixed material of polyamide resin and glass fiber or aluminum is used.

Therefore, when the above mixed material is used for the rotary valve 31, its manufacturing method is not particularly limited, but for example, by heating and fluidizing the mixed material continuously extruding through a die. Extrusion molding for molding is preferably used. The rotary valve 3 of the present invention
Examples of the molding method 1 include injection molding and the like in addition to extrusion molding.

Further, aluminum is used as the rotary valve 3
The method for producing the aluminum alloy is not particularly limited even when it is used for No. 1, but the aluminum material is drawn through a die having a hole shape of the outer shape of the rotary valve 31 and pulled out, for example. A drawing process for processing the material is suitable. Further, the valve opening 35 provided in the rotary valve 31 is, for example,
It is formed by punching the rotary valve 31 by press working.

Next, a method of manufacturing the seal member 30 of the rotary valve assembly 2 will be described. The method for manufacturing the seal member 30 is not particularly limited as long as it is a method capable of molding a resin having a self-lubricating property. Therefore,
Various methods such as extrusion molding and injection molding can be used.

As described above, after the rotary valve 31 and the seal member 30 are formed, the seal member 30 is fitted into the rotary valve 31, and the lid member 36 and the shaft 3 are attached.
Attach 7 to form rotary valve assembly 2.

In the method of manufacturing the RV intake manifold, for example, as shown in FIG. 1, the intake manifold is connected to the throttle body mounting pipe member 3 at one of the openings of the chamber, and the cylinder head is further connected. Attach the mounting plate member 4 to the pipe portion 11
Join to the opening. After that, the rotary valve assembly 2 is inserted from the other opening of the chamber, and the O-ring 5 and the valve cover 6 are assembled,
The above RV intake manifold is completed.

The method of joining the port member 1, the throttle body mounting pipe member 3, the cylinder head mounting plate member 4, and the valve cover 6 is not particularly limited, but for example, vibration welding method or laser welding method is used. , A method of using an adhesive, a method of fastening with a bolt, a method of fitting a claw, and the like.

As described above, the chamber chamber of the intake manifold in the RV intake manifold of the present invention is a port including one pipe portion 11 and the tubular portion 12 having one end of the pipe portion 11 connected to the outer wall surface. It is configured as a tubular body in which a plurality of members 1 are joined.

That is, since the intake manifold is divided into the port members 1, it can be manufactured by using a die smaller than that of the manufacturing method using the slide mechanism. Therefore, even when the number of RV intake manifolds produced is small, it is possible to suppress the die cost of the intake manifold and reduce the manufacturing cost.

Further, since the intake manifold is manufactured without using the slide mechanism, it is not necessary to use the partition plate having the complicated fitting structure. for that reason,
The cross-sectional shape of the pipe portion 11 with respect to the axial direction can be formed into a shape with high intake efficiency (a perfect circular shape). Moreover, the length and bending method (curvature) of the pipe portion 11 can be arbitrarily designed depending on the shape of the mold. That is, the degree of freedom in designing the pipe length and the curvature is improved.

Incidentally, the pipe portion 11 of both half-split bodies 10
When the cross-sectional shape of 11 is semicircular, the cross-sectional shape of the pipe portion 11 can be made to be a perfect circle when these half-split bodies 10 are joined. Therefore, it is possible to easily form the RV intake manifold having the intake efficiency improved to the theoretical value.

In the conventional intake manifold (see FIG. 15), the inner cylinder 102 having the flange-shaped passage wall (groove 103) on the outer periphery is integrally resin-molded. for that reason,
When the inner cylinder 102 is hollow, the groove thickness region 105 between the curved portion of the groove 103 and the inner wall of the inner cylinder 102 becomes the groove 1
It was thicker than the wall thickness region 106 between the wall parts of No. 03.

However, in the present invention, since the RV intake manifold is formed by joining the half-split bodies 10, the half-split body 10 can be set to a substantially constant thickness. Therefore, in the cooling step in the process of forming the half-split body 10, the half-split body 10 can be uniformly cooled, and distortion or the like does not occur. Therefore, high quality RV
A system intake manifold can be formed.

Further, for example, depending on the characteristics of the engine,
Even if the pipe portion 11 becomes long, the pipe portion 1
1 can be curved so as to surround the outer wall surface of the cylindrical portion 12, and can be arranged so as to further surround the curved pipe portion 11. Therefore, since it can be formed without forming a gap between the pipe portion 11 and the tubular portion 12, the RV intake manifold can be made more compact.

In addition, when the pipe portion 11 of the intake manifold has a plurality of chamber openings 13 (chamber openings 13a and 13b) for flowing air,
The pipe portion 11 constitutes a low-speed flow passage 21, a high-speed flow passage 22, and a merging flow passage 23. When the rotary valve assembly 2 rotates, air flows through the low-speed flow passage 21 → the merge flow passage 23 → the engine, the high-speed flow passage 22 → the merge flow passage 23 → the engine, or both of the flow passages 21.
There will be a case where the flow of the flow is 22 → merging flow path 23 → engine. That is, the distance (flow path length) through which air flows can be changed. Therefore, the intake inertia effect can be used to increase the intake charging efficiency and improve the engine output.

The above-mentioned intake inertia effect is an action utilizing the inertia of the intake air, for example, the chamber opening 1
When the intake air from 3b begins to close, the air that has been flowing until then is stopped at the chamber opening 13b, and the pressure increases due to the inertia of the air. The high pressure generated at that time is the effect of propagating in the pipe portion 11 as a pressure wave to increase the pressure near the chamber opening 13a and pushing air into the engine.

By rotating the rotary valve assembly 2, air can always be supplied to the engine while changing the flow path as described above. For example, when the valve opening 35a partially covers the chamber opening 13a, the valve opening 35b and the chamber opening 1
It is adapted to rotate so as to partially communicate with 3b. Therefore, there is no time when air is not supplied to the engine, and air can always be supplied to the engine. Therefore, it is preferable in terms of intake efficiency.

Although the case where two valve openings 35 (35a and 35b) are provided has been described in the present embodiment, the same effect can be obtained even if only one valve opening 35 is provided. Obtainable.

Further, the rotary valve assembly 2 is mounted in a state where the seal opening 32 of the seal member 30 is fitted in the valve opening 35 of the rotary valve 31 (mounted in a valve seal floating structure). . Therefore, the seal member 30 can prevent air from leaking into the gap between the rotary valve 31 and the inner wall of the chamber. In addition, since the seal member 30 has self-lubricating property, the rotary valve assembly 2 can be smoothly (smoothly) rotated in the chamber.

Further, by changing the number of the port members 1 to be joined, intake manifolds having different numbers of pipe portions 11 can be obtained. Therefore, if the displacement of each cylinder of the engine is substantially the same, the number of cylinders is increased. RV intake manifolds used in different engines can be manufactured.

When the port member 1 is used as a common member, it is possible to manufacture intake manifolds used in engines having different numbers of cylinders, so that the manufacturing cost of the RV intake manifold can be reduced.

In the present embodiment, three port members 1 are joined to form an RV intake manifold applicable to an in-line three-cylinder internal combustion engine, but the number of port members 1 is not limited to this. But can be any number.

The present invention can also be expressed as the following intake manifold.

In the intake manifold, one intake pipe is connected with a plurality of intake pipe members in which a part of the chamber is integrated. One end of each intake pipe is connected to the chamber by the first intake hole. The other end of the intake pipe is connected to the cylinder head of the engine via a connecting plate, and each intake pipe is provided with a second intake hole connected to the chamber. A cylindrical rotary valve capable of turning (sliding) is inserted inside the chamber, and a side wall of the rotary valve has the first intake hole and the second intake hole provided for each intake pipe. There is at least one hole that communicates with the position opposite to, and by rotating (sliding) the rotary valve, either the first intake hole or the second intake hole is opened. By allowing the communicating Yanba intake pipe, it may be one that can vary the flow path length of the intake air.

Further, the intake manifold may be one in which a ring-shaped seal member for preventing air leakage is inserted into the side wall opening of the above rotary valve.

[0142]

As described above, the variable intake intake manifold of the present invention includes a chamber portion having an intake port connected to the throttle body, and a plurality of chambers that communicate the inside of the chamber portion with each cylinder of the multi-cylinder internal combustion engine. And a plurality of chamber openings communicating with the pipe section are provided in the chamber section for each pipe section, and the chamber openings are selectively communicated with each pipe section. A rotary valve is inserted, and the chamber section is formed by joining a plurality of port members each including one pipe section and a tubular section whose one end is connected to an outer wall surface. It is a configuration including a tubular body.

According to this, the chamber portion is configured to include a tubular body formed by joining a plurality of port members each including one pipe portion and a tubular portion having one end of the pipe portion connected to the outer wall surface. Has been done. That is, in the variable intake intake manifold, the chamber portion and the pipe portion are divided into the port members. Therefore, the chamber portion and the pipe portion described above have an effect that they can be manufactured by joining a port member formed by using a mold that is small and inexpensive to manufacture.

Further, by changing the number of port members to be joined, intake manifolds having different numbers of pipe parts can be obtained. Therefore, if the displacement of each cylinder of the engine is substantially the same, the number of cylinders will be different. It is possible to manufacture a variable intake intake manifold used in an engine.

Further, by using the above-mentioned port member as a common member, it is possible to manufacture the chamber portion of the variable intake intake manifold used in engines having different numbers of cylinders. Therefore, it is possible to reduce the manufacturing costs of the plurality of types of variable intake intake manifolds as a whole.

Further, in the variable intake intake manifold of the present invention, in addition to the above-mentioned constitution, the port member is constituted by joining a half-divided body which is halved perpendicularly to the axial direction of the tubular portion. Preferably.

According to this, the chamber portion and the pipe portion of the variable intake intake manifold can be molded without using the conventional slide mechanism. Therefore, it is not necessary to use a partition plate having a complicated fitting structure. Accordingly, the cross-sectional shape of the pipe portion in the axial direction can be formed to have a shape with high intake efficiency (for example, a perfect circle shape). In addition, the length and bending method (curvature) of the pipe portion can be arbitrarily designed by the mold shape of the half body. In other words, the degree of freedom in designing the length and curvature of the pipe portion is improved.

Further, the wall thickness of the half-split body can be made substantially constant. Therefore, in the cooling process in the process of forming the half-split body,
Since the half body can be cooled uniformly, no distortion or the like occurs. Therefore, there is an effect that a high quality variable intake intake manifold can be formed.

If the cross sections of the pipe parts of both halves are made semicircular, the cross sections of the pipe parts can be made perfectly circular when these halves are joined. That is, there is an effect that it becomes possible to form a variable intake intake manifold whose intake efficiency is improved to a theoretical value.

Further, in the variable intake intake manifold of the present invention, in addition to the above structure, the pipe portion is curved so as to surround the outer wall surface of the chamber portion,
In addition, it is preferable that the curved pipe portion is formed so as to further surround the curved pipe portion.

According to this, for example, even if the pipe portion becomes long due to the characteristics of the engine, the pipe portion is curved so as to surround the outer wall surface of the chamber portion, and the curved pipe portion is curved. It may be arranged to further surround the section. Therefore, the pipe portion can be formed without forming a gap between the pipe portion and the chamber portion, and the variable intake intake manifold can be made more compact.

Further, in the variable intake intake manifold of the present invention, in addition to the above structure, the rotary valve starts closing one of the chamber openings for each pipe section, and then opens the other chamber openings. It is preferable to provide a valve opening portion for communication.

According to this, air can be constantly supplied to the engine in the process of switching the chamber opening. Therefore, there is no time when the air is not supplied to the engine, and there is an effect that the intake efficiency is excellent.

The air flowing from one pipe opening and the air flowing from the other pipe opening have different distances flowing into the pipe. That is, the flow distance of air can be changed (the flow path length can be changed). Therefore, the engine output can be improved by utilizing the intake inertia effect.

Further, in the variable intake intake manifold of the present invention, in addition to the above-mentioned structure, the rotary valve is brought into contact with the inner wall of the chamber part at the valve opening, and the rotary valve and the inner wall of the chamber part are connected to each other. It is preferable to have a seal member that seals the gap.

According to this, the seal member seals the gap between the rotary valve and the inner wall of the chamber section. Therefore, there is an effect that air leakage from the gap is prevented.

A method of manufacturing a variable intake intake manifold according to the present invention comprises a chamber portion having an intake port connected to a throttle body, and a plurality of pipe portions for communicating the inside of the chamber portion with each cylinder of a multi-cylinder internal combustion engine. A plurality of chamber openings that are provided in the chamber section and communicate with the pipe sections are provided for each pipe section, and a rotary valve that selectively communicates the chamber openings with each pipe section is inserted. In the method of manufacturing a variable intake intake manifold provided, the chamber is formed by joining a plurality of port members each including one pipe portion and a tubular portion whose one end is connected to an outer wall surface. This is a configuration including a chamber portion forming step of forming a portion.

According to this, the chamber portion has a structure including a tubular body formed by joining a plurality of port members each including one pipe portion and a tubular portion having one end of the pipe portion connected to the outer wall surface. is there. That is, in the variable intake intake manifold, the chamber portion and the pipe portion are divided into the port members. Therefore, according to the above method, the chamber portion and the pipe portion can be manufactured by joining the port member formed by using a mold that is small and inexpensive to manufacture. In other words, even when the number of products manufactured is small, it is possible to suppress the die cost and reduce the manufacturing cost of the variable intake intake manifold.

Further, by changing the number of port members to be joined, intake manifolds having different numbers of pipes can be obtained. Therefore, if the displacement of each cylinder of the engine is substantially the same, the number of cylinders will be different. It is possible to manufacture a variable intake intake manifold used in an engine.

If the above-mentioned port member is used as a common member, it is possible to manufacture the chamber portion of the variable intake intake manifold used in engines having different numbers of cylinders. Therefore, it is possible to reduce the manufacturing costs of the plurality of types of variable intake intake manifolds as a whole.

Further, in the method for manufacturing a variable intake intake manifold according to the present invention, with respect to the axial direction of the tubular portion,
It is preferable that the method further includes a port member forming step of joining the vertically divided halves to form the port member.

According to this, the chamber portion and the pipe portion of the variable intake intake manifold can be molded without using the conventional slide mechanism. Therefore, it is not necessary to use a partition plate having a complicated fitting structure. Accordingly, the cross-sectional shape of the pipe portion in the axial direction can be formed to have a shape with high intake efficiency (for example, a perfect circle shape). In addition, the length and bending method (curvature) of the pipe portion can be arbitrarily designed by the mold shape of the half body. In other words, the degree of freedom in designing the length and curvature of the pipe portion is improved.

Further, the wall thickness of the half-split body can be made substantially constant. Therefore, in the cooling process in the process of forming the half-split body,
Since the half body can be cooled uniformly, no distortion or the like occurs. Therefore, there is an effect that a high quality variable intake intake manifold can be formed.

If the cross sections of the pipe parts of the two half halves are made semicircular, the cross sections of the pipe parts can be made to be perfectly circular when these half halves are joined. That is, there is an effect that it becomes possible to form a variable intake intake manifold whose intake efficiency is improved to a theoretical value.

[Brief description of drawings]

FIG. 1 is an explanatory view of a rotary valve type intake manifold according to an embodiment of the present invention in a disassembled state.

FIG. 2 is a side view showing a structure of a port member of the intake manifold that constitutes the rotary valve type intake manifold of FIG.

FIG. 3 is a side view showing another example of the port member of FIG.

4 is a cross-sectional view of the port member of FIG. 2 taken along the line AB.

5 is a cross-sectional view taken along the line A-C of the port member of FIG.

6 is a cross-sectional view taken along the line A-D of the port member of FIG.

7 is a sectional view of the port member of FIG. 2 taken along the line AE.

8 is an explanatory diagram showing a rotary valve of a rotary valve assembly that constitutes the intake manifold of the rotary valve system of FIG. 1. FIG.

9 is an explanatory diagram showing a seal member attached to a rotary valve that constitutes the rotary valve type intake manifold of FIG. 1. FIG.

FIG. 10 is a detailed explanatory view of the seal member shown in FIG.

FIG. 11 is an explanatory view showing a mounting state of a seal member of a rotary valve assembly inserted in a chamber portion.

FIG. 12 is an explanatory diagram showing a state of a chamber opening portion in a state where a rotary valve having a seal member attached thereto is inserted in the chamber portion.

FIG. 13 is an explanatory diagram showing a state in which a rotary valve, a lid member, and a shaft that constitute the rotary valve assembly are separated.

FIG. 14 is a sectional view of the port member of FIGS. 4 to 7 taken along the line FF ′.

FIG. 15 is a sectional view showing a conventional intake manifold.

[Explanation of symbols]

1a to 1c Port member 2 Rotary valve assembly 3 Throttle body mounting pipe member (cylindrical body,
Chamber part 6 Valve cover (chamber part) 7 Intake port 8 Chamber body part (cylindrical body, chamber part) 10 Half-split body 11 Pipe part 12 Cylindrical part (cylindrical body, chamber part) 13a, 13b Chamber opening part 14 1st partition wall 15 2nd partition wall 16a, 16b Split partition wall 21 Low speed flow path 22 High speed flow path 23 Merge flow path 30 Seal member 31 Rotary valve 32a, 32b Seal opening part 33a, 33b Seal mounting part 34a, 34b Seal reinforcement part 35a , 35b Valve opening 91 Throttle body

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02M 35/10 102R 102N F term (reference) 3G031 AA28 AB04 AC01 BA07 BA14 BB05 DA12 DA34 DA38 EA02 FA03 HA01 HA04 HA10 HA11

Claims (7)

[Claims] 1. A chamber section having an intake port connected to a throttle body, and a plurality of pipe sections for communicating the inside of the chamber section with each cylinder of a multi-cylinder internal combustion engine, and the chamber section includes In the variable intake intake manifold in which a plurality of chamber openings communicating with the pipe section are provided for each pipe section, and a rotary valve for selectively communicating the chamber opening section for each pipe section is inserted, The chamber section is configured to include a tubular body formed by joining a plurality of port members each including one pipe section and a tubular section having one end of the pipe section connected to an outer wall surface. Variable intake intake manifold. 2. The variable intake according to claim 1, wherein the port member is formed by joining a half body that is half-divided perpendicularly to the axial direction of the tubular portion. Intake manifold. 3. The pipe part is formed so as to be curved so as to surround the outer wall surface of the chamber part, and to extend so as to further surround the curved pipe part. The variable intake intake manifold according to claim 1 or 2. 4. The rotary valve starts closing one of the chamber openings for each pipe section,
The variable intake intake manifold according to any one of claims 1 to 3, further comprising a valve opening that communicates with another chamber opening. 5. The rotary valve according to claim 1, wherein the valve opening has a seal member that abuts against an inner wall of the chamber section and seals a gap between the rotary valve and the inner wall of the chamber section. Items 1 to 4
The variable intake intake manifold according to any one of 1. 6. A chamber part having an intake port connected to a throttle body, and a plurality of pipe parts for communicating the inside of the chamber part with each cylinder of a multi-cylinder internal combustion engine, and the chamber part Manufacturing of a variable intake intake manifold in which a plurality of chamber openings communicating with the pipe section are provided for each pipe section, and a rotary valve for selectively communicating the chamber opening section for each pipe section is inserted. The method includes the step of forming a chamber part by joining a plurality of port members each including one pipe part and a tubular part whose one end is connected to an outer wall surface. A method of manufacturing a variable intake intake manifold, comprising: 7. A port member forming step of forming a port member by joining a half body that is vertically divided in half with respect to the axial direction of the tubular portion.
5. A method for manufacturing a variable intake intake manifold as described in.