JP2003138944A - Intake device of v-internal combustion engine - Google Patents

Intake device of v-internal combustion engine

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Publication number
JP2003138944A
JP2003138944A JP2001331326A JP2001331326A JP2003138944A JP 2003138944 A JP2003138944 A JP 2003138944A JP 2001331326 A JP2001331326 A JP 2001331326A JP 2001331326 A JP2001331326 A JP 2001331326A JP 2003138944 A JP2003138944 A JP 2003138944A
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JP
Japan
Prior art keywords
intake
outer member
upper
member
portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2001331326A
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Japanese (ja)
Other versions
JP3901492B2 (en
Inventor
Kazuhiro Akima
Nobuyuki Imai
Kenji Yokozuka
信幸 今井
憲二 横塚
和洋 秋間
Original Assignee
Honda Motor Co Ltd
Metts Corp
本田技研工業株式会社
株式会社メッツ
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Application filed by Honda Motor Co Ltd, Metts Corp, 本田技研工業株式会社, 株式会社メッツ filed Critical Honda Motor Co Ltd
Priority to JP2001331326A priority Critical patent/JP3901492B2/en
Publication of JP2003138944A publication Critical patent/JP2003138944A/en
Application granted granted Critical
Publication of JP3901492B2 publication Critical patent/JP3901492B2/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02TCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00Road transport of goods or passengers
    • Y02T10/10Internal combustion engine [ICE] based vehicles
    • Y02T10/12Technologies for the improvement of indicated efficiency of a conventional ICE

Abstract

PROBLEM TO BE SOLVED: To provide an intake device of a V-internal combustion engine capable of compactly disposing an intake manifold in a space between V-shaped banks even when the maximum intake passage length is set long and providing a highly rigid intake manifold. SOLUTION: The intake manifold of the intake device of the V-internal combustion engine is disposed in the space formed between both banks. The intake manifold M comprises an outer member M1 divided into a lower outer member 30 and an upper outer member 40 and an inner member M2 disposed in the outer member and divided into a pair of lower inner members 50 and a pair of upper inner members 60. The pair of lower inner members 50 are arranged on the lower outer member 30 in a lateral direction orthogonal to an axial direction, and the pair of upper inner members 60 are arranged on the upper outer member 40 parallel with each other in an axial direction. An intake passage connected to an intake collecting chamber is formed of the outer member M1 and the inner member M2, and the division surface of the lower outer member 30 from the lower inner member 50 and the division surface of the upper outer member 40 from the upper inner member 60 are formed along the intake passage.

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 a V-type internal combustion engine, and more particularly to an intake system having an intake manifold having a multi-divided structure composed of an outer member and an inner member that are both vertically divided. .

[0002]

2. Description of the Related Art Conventionally, as an intake manifold for an intake device of this type, one disclosed in Japanese Patent Application Laid-Open No. 8-4607 is known. In this intake manifold (intake manifold) applied to a V-type 8-cylinder internal combustion engine, a surge tank is formed by an intermediate part provided between an upper part and a lower part, and a plurality of intake pipe passages communicating with the surge tank are formed. Is formed by the upper part and the intermediate part. The upper part and the intermediate part are divided along the center line of the intake pipe passage, and the dividing surfaces formed in steps on the partition walls of the upper part and the intermediate part are fitted to each other to prevent intake air leakage from the dividing surface. Is suppressed. Further, with respect to the partition wall located in the center, the concave dividing surface formed on the partition wall of the upper part and the convex dividing surface formed on the partition wall of the intermediate part are fitted. Accordingly, the intake pipe length can be easily changed by changing the intermediate component, and even if the intermediate component is bent to change the intake pipe length, the intake manifold can be manufactured without using the core. further,
The publication also discloses that the intermediate component is composed of a pair of members.

[0003]

In the prior art, a plurality of intake pipes extending downward from the upper end surface side are formed in the lower part, and the upper end surface side is closed by a flat plate-shaped upper wall portion. As a result, a surge tank is formed between the upper wall portion and the intermediate component, so that a dead space is formed below the upper wall portion. Therefore, if you try to increase the maximum intake pipe length (maximum intake passage length) of the intake pipe passage that is formed only by the upper part and the intermediate part of the intake manifold, or increase the volume of the surge tank, the vertical direction of the intake manifold will increase. The size of the intake manifold becomes large, which makes it difficult to compactly arrange the intake manifold in the space formed by the V bank. Therefore, in order to set the maximum intake pipe length to be long or to set the surge tank volume to be large, it may be possible to bend the upper wall downward to reduce the dead space. The area becomes large and the rigidity decreases.

Further, whether the dividing surfaces of the upper part and the intermediate part in the intake pipe passage are formed in steps, respectively,
Or, since it is formed in a concave shape or a convex shape consisting of multiple steps, the passage walls (respective partition walls) where the fitting parts of both parts are formed are the entire length of the center line and the entire vertical width of the partition wall. In addition, there is a problem that the intake manifold becomes heavier than the other passage walls of the intake pipe passage (that is, thicker) and the intake manifold becomes heavier. Further, when viewed in the axial direction, the dividing surface overlaps the entire center line, so that the intake pipe passages that are adjacent in the axial direction are formed with a relatively large deviation in the left-right direction, especially at the intake port side end of the internal combustion engine. In the intake manifold described above, the center lines of the adjacent intake pipe passages are also relatively displaced from each other, which may make it difficult to manufacture the intake manifold.

The present invention has been made in view of such circumstances, and the inventions according to claims 1 to 5 are:
An object of the present invention is to provide an intake system for a V-type internal combustion engine in which the intake manifold is compactly arranged in the space between the V-shaped banks even when the maximum intake passage length is set large, and the rigidity of the intake manifold is high. To do. The invention according to claim 2 further has a split structure in which the air intake manifold is made lighter while ensuring the airtightness of the split surface in the intake passage, and is not easily restricted by the shape of the intake passage. The invention according to claim 3 further aims at improving the assemblability of the intake manifold having the divided structure, and the invention according to claim 4 further comprises the formation of the positioning portion. It is an object of the present invention to reduce the airtightness of the fitting portion due to the effect of the intake pressure, and the invention of claim 5 further aims to reduce the cost of the intake manifold.

[0006]

According to the invention described in claim 1, a pair of banks formed by arranging a predetermined number of cylinders in parallel in the axial direction of the crankshaft forms a V-shaped V.
An intake manifold arranged in a space formed between both banks of the internal combustion engine, and an intake manifold, and a predetermined number of intake passages connected to the intake manifold and arranged in parallel in the axial direction. In the intake system for a V-type internal combustion engine, the intake manifold includes a component member including an outer member and an inner member disposed inside the outer member, and the outer member includes a lower outer member and an upper outer member. And an inner member, and the inner member is vertically divided into a pair of lower inner members and a pair of upper inner members, and the pair of lower inner members are axially disposed inside the lower outer member. Are arranged side by side in the left-right direction orthogonal to the direction, the pair of upper inner members are arranged side by side in the axial direction inside the upper outer member, and the intake collecting chamber is at least the lower portion. An outer member and a pair of lower inner members are formed, and each of the intake passages is formed of the lower outer member and the lower inner member, and the upper outer member and the upper inner member. An intake device for a V-type internal combustion engine, wherein a first dividing surface of the lower outer member and the lower inner member and a second dividing surface of the upper outer member and the upper inner member are formed along the intake passage. is there.

According to the first aspect of the present invention, the lower outer member and the lower inner member in each intake passage are provided with the first outer member.
Second of dividing surface and upper outer member and upper inner member
Since the dividing surface is formed along the intake passage, the intake manifold can be manufactured without using the core. Each intake passage of such an intake manifold is formed by arranging the lower and upper inner members inside the lower and upper outer members formed by dividing the outer member into upper and lower parts, respectively. Not only the member but also the lower outer member is used to form the intake passage, and at least the lower outer member is used to form the intake collecting chamber, so that the intake air is also introduced into the lower part of the space of both banks. Since the manifold can be arranged, the intake manifold can be compactly arranged in the space even if the dead space in the space is reduced and the maximum intake passage length and the volume of the intake collecting chamber are increased. Becomes compact. In addition, although the intake chamber and the intake passage are formed in the lower outer member and the area of the wall forming them increases, a pair of upper inner members are axially aligned in the upper outer member. Was set up,
By arranging the pair of lower inner members side by side in the lower outer member in the left-right direction, the intake manifold is reinforced in the axial direction and the left-right direction which are directions orthogonal to each other, and thus the lower inner member and the upper inner member are provided. Each one
Compared to the one made up of two members, the inner member can be made lighter by the amount that the connecting portion or the like is not necessary to make it a single member, and thus the intake manifold can be made lighter, and in addition, the outer member can be made lighter. The rigidity of the intake manifold having a divided structure including the inner member and the inner member can be increased, and the intake sound (transmission sound) generated when the intake air passes through the intake passage is suppressed from being emitted to the outside of the intake manifold. As a result, the noise caused by the intake sound is reduced, and the vibration resistance of the intake manifold is also improved.

The invention according to claim 2 is the V according to claim 1.
In the intake device for a type internal combustion engine, the second split surface is a fitting portion having a single step formed in only one of the upper outer member and the upper inner member that are fitted to each other. Is formed by a mating surface of the intake passage and crosses the center line of the intake passage when viewed from the axial direction.

According to the invention of claim 2, in addition to the effect of the invention of claim 1, the following effect is exhibited. That is, the second divided surface is configured by the mating surface of the fitting portion having the step portion into which the upper outer member and the upper inner member are fitted, thereby increasing the contact area of both members at the fitting portion. Therefore, the leakage of the intake air from the second split surface can be prevented or suppressed, and the airtightness on the second split surface is ensured. Further, since the step portion of the fitting portion is a single step portion formed only on one of the upper outer member and the upper inner member, it is possible to reduce the thickness of the other member where the step portion is not formed. Therefore, as compared with an outer member and an inner member that are fitted to each other with a step portion formed therein, the passage wall where the fitting portion is formed has less padding, and the intake air is reduced. The manifold is lightened.
Moreover, when viewed in the axial direction, the second dividing surface crosses the center line of the intake passage, so that the fitting portion is provided in a wide range outside and inside of the dividing surface away from the center line of the intake passage. Therefore, even in an intake manifold which axially adjoins and an intake manifold whose center line is relatively largely displaced in the left-right direction, an intake manifold having a split surface along the intake passage of the upper outer member and the upper inner member is manufactured. Thus, it is possible to obtain an intake system for a V-type internal combustion engine having an intake manifold having a split structure that is not easily restricted by the shape of the intake manifold, and moreover, because it has a step portion, compared to other portions. It becomes possible to provide the position of the thick fitting portion away from the center line, and the step portion is formed to reduce the thick passage wall and at the same time. By increasing the channel wall of the intake passage which stepped portion is formed by a member that is not provided, it can be promoted and the weight of the intake manifold.

The invention according to claim 3 is the V according to claim 2.
-Type internal combustion engine intake device, the step portion is formed in the upper outer member, and the fitting portion of the second divided surface located outside the center line when viewed from the axial direction. At the outermost part of the outer portion, a cross section along the axial direction has a groove shape, and a positioning portion that restricts movement of the upper inner member in the axial direction with respect to the upper outer member is provided.

According to the invention of claim 3, in addition to the effect of the invention of claim 2, the following effect is exhibited. That is, since the fitting portion has the groove-shaped positioning portion, the assembling property of the upper outer member and the upper inner member is improved, and the positioning portion has a position more than the center line when viewed in the axial direction. Since it is provided on the outermost part of the outer portion of the second divided surface located on the outer side, the passage wall which is thick because of the concave groove shape is formed on the inner side even though the positioning portion has the concave groove shape. Since it can be restrained from extending toward, the increase in wall thickness due to the formation of the fitting portion is suppressed, and the intake manifold is lightened.

The invention according to claim 4 is the V according to claim 3.
In an intake system for a type internal combustion engine, the step portion is formed on one side in the left-right direction from the positioning portion, and a first step portion with which one side surface of the upper inner member in the axial direction contacts, A second step portion formed on the other side in the left-right direction from the positioning portion and in contact with the other side surface of the upper inner member in the axial direction, the positioning portion, when viewed in the axial direction, The first step and the second step are formed by an overlapping portion.

According to the invention of claim 4, in addition to the effect of the invention of claim 3, the following effect is exhibited. That is, the step portion formed on the upper outer member is composed of the first and second step portions extending in the left-right direction from the positioning portion, so that the thickness of the fitting portion can be reduced by fitting using the step portion. Meanwhile, in the fitting portion, the inner member comes into contact with the step portion on both side surfaces in the axial direction as a whole,
Even when the intake pressure acts on the fitting portion from both sides in the axial direction, there is a portion where the upper inner member is pressed against the upper outer member, so that the fitting portion is deformed due to the action of the intake pressure. Thus, it is possible to prevent the airtightness from degrading on the dividing surface. Further, the positioning portion can be easily formed by forming the first step portion and the second step portion in the portion overlapping in the axial direction.

According to a fifth aspect of the present invention, in the intake system for the V-type internal combustion engine according to any one of the first to fourth aspects, the pair of lower inner members is a plan view of the lower outer member. Are arranged inside the lower outer member in a point symmetry with respect to a center point thereof, and the pair of upper inner members are in a point symmetry with respect to a center point of the upper outer member in a plan view. Is placed inside the.

According to the invention of claim 5, in addition to the effects of the invention of the cited claim, the following effect is exhibited. That is, the pair of lower inner members and the pair of upper inner members are arranged point-symmetrically to the lower outer member and the upper outer member, respectively, that is, the pair of lower inner members and the pair of upper inner members are the same. By designing according to specifications, each inner member can be made common, so it is possible to simplify the manufacturing equipment and reduce the cost of the intake manifold due to the effect of mass production, and also in terms of maintenance such as replacement of members and cost. It is advantageous.

In this specification, "axial direction" means the direction of the axis of rotation of the crankshaft of a V-type internal combustion engine, unless otherwise specified.
Unless otherwise specified, when the internal combustion engine is viewed from the axial direction, the side where the V-shape formed by a pair of banks is open is the upper side, and the direction in which the V-shaped symmetry line extends is the vertical direction, with reference to FIG. "Upper and lower" and "left and right" respectively.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. Referring to FIG. 1, a V-type internal combustion engine E to which an intake device of the present invention is applied is installed vertically in a vehicle body front portion such that a rotation axis of a crankshaft (not shown) is oriented in the front-rear direction of the vehicle. It is a type 8 cylinder internal combustion engine. The internal combustion engine E has eight cylinders 2 in the axial direction A1.
(A direction of the rotation axis of the crankshaft, see FIG. 2), a pair of left and right cylinder rows CL and CR formed by arranging four cylinders in a left and right direction are formed into a V-shape, and a left and right cylinder block 1. Pair of left and right cylinder heads 3 respectively connected to the cylinder rows CL and CR, and left and right which are respectively connected to both cylinder heads 3 and form a valve operating chamber for accommodating a valve operating device between the cylinder heads 3. And a pair of head covers 4. A pair of left and right banks BL and BR forming a V shape are formed by the left and right cylinder rows CL and CR, the cylinder head 3 and the head cover 4.

It should be noted that, with the internal combustion engine E being mounted on the vehicle, "upper and lower" and "left and right" with respect to the vehicle.
Correspond to "upper and lower" and "left and right" in the description, respectively. Further, since the left and right banks BL and BR have basically the same structure, the left bank BL will be mainly described below, and the corresponding parts in the right bank BR will be denoted by the same reference numerals.

A piston 5 reciprocally fitted in a cylinder hole 2a of each cylinder 2 rotatably drives the crank shaft rotatably supported by the cylinder block 1 via a connecting rod. In the cylinder head 3, for each cylinder 2, a combustion chamber 6 formed of a recess formed at a position facing the cylinder hole 2a, and a pair of intake valve openings 7a opening in the combustion chamber 6 are formed.
And an exhaust port 8 having a pair of exhaust valve ports 8a opening to the combustion chamber 6, are formed.
A pair of intake valves 9 and a pair of exhaust valves 10 are provided which are driven by the valve operating device in synchronization with the crankshaft to open and close both intake valve openings 7a and exhaust valve openings 8a at predetermined timings. To be

Furthermore, each intake port 7 is connected to the left and right banks.
There is one opening 7b on the side surface of the cylinder head 3 on the space S side formed between BL and BR. The intake manifold M arranged in the space S and connected to the cylinder head 3 has a size that suppresses the pressure fluctuation of the intake air caused by the opening and closing of the intake valve 9 while the intake air whose flow rate is controlled by the throttle valve 11 flows in. And an eight intake passages 21 connected to the intake collection chamber 20 at the upstream end 21a and connected to the opening 7b of the intake port 7 at the downstream end 21b.
Have and. These intake passages 21 include four left bank side intake passages 21L connected to the intake ports 7 of the left bank BL,
It consists of four right bank side intake passages 21R connected to the intake port 7 of the right bank BR, and the left bank side intake passage 21L and the right bank side intake passage 21R are arranged alternately one by one in the axial direction A1. (See FIG. 2).

The intake passage 21 is opened and closed by an intake control valve 24 provided in the intake passage 21 in accordance with the engine rotation speed, so that the internal combustion engine E operates in a low speed rotation range where the engine rotation speed is below a predetermined value. When the engine is operated, it becomes an intake air supply passage to the intake port 7, and the long intake passage 22 set to the intake passage length that effectively exhibits the effect of inertia supercharging in the low speed rotation range and the engine rotation speed are When the internal combustion engine E is operated in the high speed rotation range exceeding the predetermined value, it serves as an intake supply passage to the intake port 7 and is set to an intake passage length that effectively exhibits the inertia supercharging effect in the high speed rotation range. The short intake passage 23 has a shorter intake passage length than the long intake passage 22. The intake collecting chamber 20 includes an upstream end 22 of each long intake passage 22.
a (that is, the upstream end 21a) and the upstream end 23a of the short intake passage 23 in which the intake control valve 24 is fully closed in the low speed rotation range and fully opened in the high speed rotation range are connected. .

Referring to FIGS. 2 and 3 together, the intake manifold M is a main body formed by injection molding using a synthetic resin as a molding material or die casting using a light metal such as aluminum or magnesium or an alloy thereof as a molding material. And the main body has a multi-divided structure composed of divided components. Specifically, the main body is composed of an outer member M1 which is vertically divided, and an inner member M2 which is arranged inside the outer member M1 and vertically divided. Therefore, the intake manifold M is composed of the main body forming the intake collecting chamber 20 and the intake passage 21, and various members described later that are connected to the main body.

The outer member M1 is vertically divided into a lower outer member 30 and an upper outer member 40 by a horizontal dividing surface D1 (see FIG. 1). The upper outer member 40 is inserted through the insertion hole F1 (see FIGS. 3 and 4) of the lower outer member 30 from below and is screwed into the screw hole F2 (see FIG. 8) of the upper outer member 40 by a plurality of bolts. The lower outer member 30 is joined to the cylinder head 3 by a plurality of bolts inserted into the insertion holes F3 by the left and right flanges 35 of the lower outer member 30.

A lower outer member 30 for accommodating a lower inner member 50, which will be described later, has an end wall on one side in the axial direction A1 (the left side in FIG. 2, which is the front side with respect to the vehicle).
31 and the end wall 32 on the other side in the axial direction A1 (the right side in FIG. 2, which is the “rear side” with respect to the vehicle).
An outer wall 33, which is a part of the intake passage 21 and is a passage wall outside the first passage P1 that is curved in a J shape when viewed from the axial direction A1, and a lower chamber wall 34 of the intake collecting chamber 20. The walls 31 to 34 are formed to have a substantially uniform wall thickness. Part of both end walls 31, 32 form a passage wall of the first passage P1. Furthermore, each flange 35 has
Insertion of a third passage P3 that is connected to the intake port 7 and is a part of the intake passage 21, and a fuel injection valve 90 that injects fuel toward a pair of intake valve ports 7a for each intake port 7 Hole
F4 is formed. Further, in the end wall 32, an exhaust gas introduction pipe for introducing the exhaust gas, whose flow rate is controlled by the recirculation control valve, into the intake collection chamber 20 in order to perform exhaust gas recirculation (EGR).
91 is attached.

An upper outer member 40 for accommodating an upper inner member 60, which will be described later, has an end wall 41, 42 on the one side and the other side, a part of which is a passage wall of the second passage P2, and an intake passage 21. Second part that is curved so as to be convex upward
An outer wall 43 that is a passage wall outside the passage P2, a partition wall 44 that is a passage wall of the second passage P2 (see FIGS. 2 and 10), and a passage wall of the second passage P2, which will be described later. Both inner end walls 45 facing each other across the communication passage 47 are formed, and these walls 41 to 45 have a substantially uniform wall thickness. Here, as shown in FIGS. 3 and 10, the partition wall 44 is continuous with the outer wall 43 and is adjacent to the second wall 43.
The adjacent second passage located between the outer walls 43 of the passage P2
The inner wall 44a that partitions P2 in cooperation with the partition wall 64 of the upper inner member 60, and the intake passage 21 that is juxtaposed in the axial direction A1 as described below are displaced in the left-right direction at the left and right ends of the intake manifold M. And a side wall 44b which is a passage wall facing the axial direction A1 of the second passage P2. The side wall 44b is a part of the partition wall 44 having an outer surface exposed to the outside.

Referring to FIGS. 2 and 3, the upper outer member
The central portion of 40 in the axial direction A1 passes through the central plane CP1 which is orthogonal to the axial direction A1 and is located at the central portion in the axial direction A1 of the upper outer member 40 (hence, the intake manifold M), and the Intake air inflow portion 46 that forms an inflow passage 46b along
A throttle base 12 made of an aluminum alloy is coupled to an opening 46a opened to the right, which is one of the left and right directions of the intake air inflow portion 46, and the throttle base 12 is further connected.
A throttle body 13 to which a throttle valve 11 is attached is connected to (see FIG. 1). As a result, the throttle base 12 and the throttle body 13 that serve as intake introduction members
And an intake manifold M are configured. Then, in the intake manifold M, the intake inflow portion 46 allows the eight second passages P2 arranged in the axial direction A1 to be connected to the intake inflow portion.
A communication passage for guiding the intake air flowing in from 46 to the intake air collection chamber 20
The two intake passages 21 are divided into two parts, with the first intake passage part formed of the four intake passages on the one side and the second intake passage part formed of the four intake passages on the other side. To be done.

Further, on the end wall 42 of the upper outer member 40,
One negative pressure actuator 92 that drives the intake control valve 24
The bracket 93 to which is attached is joined. The actuator 92 is rotatably attached to the body 73 of the valve unit 70, which will be described later, via a link lever mechanism 95 arranged in the intake collecting chamber 20 by a rod 94 connected to a diaphragm that responds to intake negative pressure. By rotating the two supported operating shafts 25, all four intake control valves 24 fixed to each operating shaft 25 are simultaneously opened and closed according to the engine rotation speed. In addition, 96 is a negative pressure extraction pipe.

On the other hand, the inner member M2 having a substantially uniform thickness is
A pair of lower inner members 50 and a pair of upper inner members are formed by the division surface D2 (see FIG. 1) that is on the same plane as the division surface D1.
It is divided into two parts, 60 and above. As shown in FIG. 5, both lower inner members 50 designed to have the same specifications are arranged inside the lower outer member 30 in the left-right direction which is a direction orthogonal to the axial direction A1, and the lower outer member 30 ( Therefore, the center plane CP located at the center of the intake manifold M) in the left-right direction
Dividing surface D1 which is a plan view of the lower outer member 30 with 2 being sandwiched therebetween.
The center point CT when viewed from (the intersection line between the center plane CP1 and the center plane CP2, which will be located at the center in the axial direction A1 even in the lower outer member 30, and the plane including the division plane D1) Are arranged point-symmetrically with respect to each other to form left and right lower inner members 50, which are respectively coupled to the lower outer member 30 by two screws.

Each lower inner member 50 forms an inner wall 51 which is an inner passage wall of the first passage P1 and a partition wall 52 which is the passage wall of the first passage P1 and faces the axial direction A1. To do. Then, the inner portion of the first passage P1 is formed by the concave groove formed by the inner wall 51 and the pair of adjacent partition walls 52 and extending upward while curving from below.

Further, referring to FIGS. 1, 4 and 5, on the left and right side portions of the lower outer member 30, the top surfaces are respectively projected so as to slightly exceed the center line N of the second passage P2. 5 formed by bulging the wall of the lower outer member 30 from the outside to the inside
One mounting seat 36 is formed in the range from the bottom of the lower outer member 30 to the left and right sides to the split surface D1 at intervals in the axial direction A1. Mounting seats 36 adjacent to each other with the center plane CP1 in between
The distance in the axial direction A1 is equal to the axial direction A1 of the communication passage 47 (see FIG. 2).
The width is set to be wider than the interval between the other adjacent mounting seats 36 that are set to correspond to the width of the first passage P1 in the axial direction A1. Then, between the mounting seats 36 that are adjacent to each other in the axial direction A1 and between the mounting seat 36 and the end wall 31 or the end wall 32, there are four concave grooves formed in cooperation with the outer wall 33. 1
The outer part of the passage P1 is formed. Further, the bottom of each mounting seat 36 is a curved portion 36b curved in a flare shape so as to form the upstream end of the long intake passage 22.

Then, the lower outer member 30 and the respective lower inner members 50 are fitted to each other at the fitting portion H1, whereby the intake collecting chamber 20 and the first passage having a substantially rectangular passage cross section.
P1 is formed. Specifically, in the intake collecting chamber 20, the lower inner member 50 is formed as a partition wall with the first passage P1, and the lower outer member 30 is formed as a lower chamber wall 34. Also, the first passage P1
As for the left lower inner member 50 and the lower outer member 30, the first passage P1 of the left bank intake passage 21L is formed in a line in the axial direction A1 by the right side portions of the left lower inner member 50 and the lower outer member 30. The left side portion of the member 30 forms a first passage P1 of the right bank intake passage 21R in a line in the axial direction A1.

By the way, the fitting portion H1 between the lower outer member 30 and each lower inner member 50 includes a single step portion T1 formed on the lower outer member 30 and each partition wall fitted to the step portion T1. It is composed of a tip portion 52a of 52 (see FIGS. 1 and 2). Then, the stepped portion T1 is on the top surface 36a side of each mounting seat 36, and a single stepped portion 36c formed on the peripheral edge portion facing the concave groove, and on the inside of each end wall 31, 32, Each of the partitions includes a single stepped portion 31a, 32a formed by a stepped bulge formed by bulging the end wall 31, 32 outward in the axial direction A1. The front end portion 52a of the wall 52 has a plate shape having no step and a flat surface.

As a result, the first dividing surface V1 (hatched portion in FIG. 9) of the lower outer member 30 and the lower inner member 50 in each first passage P1 along the first passage P1 is , The mating surface of the fitting portion H1. Among them, the first portion V1a of the first dividing surface V1 due to the fitting at the step portion 36c is centered in a state where it overlaps with the center line N of the intake passage 21 when viewed from the axial direction A1 as shown in FIG. The second portion V1b of the first divided surface V1 formed by fitting in the step portions 31a and 32a along the line N is a center line along the center line N when viewed from the axial direction A1. It is formed inward of N. Then, at the first dividing surface V1, the mounting seat 36 and the end wall
Since the walls 31 and 32 are in surface contact with the partition wall 52, leakage of intake air is suppressed and airtightness is secured.

Further referring to FIG. 3 as well, each lower inner member 50 has a pair of tubular members which are circular tubular and have an axis in the axial direction A1 toward the center of the lower outer member 30 in the left-right direction. The portion 53 is bisected in the axial direction A1 and integrally molded.
A passage 53a is formed in each tubular portion 53, and the passage 53a has an inlet portion 53b near the end walls 31, 32 of the lower outer member 30 and a central portion of the intake collecting chamber 20 in the axial direction A1. Has an outlet portion 53c. And the end wall to which the exhaust introduction pipe 91 is attached
A pair of outlet pipe portions 91a of the exhaust gas introduction pipe 91 are inserted into and fitted into the respective inlet portions 53b of the pair of left and right tubular portions 53 near 32, and the recirculated exhaust gas is introduced from the outlet portion 53c into the intake collecting chamber. Inflow to 20.

Further, the tubular portion 53 forms the upper wall portion of the upstream end portion 21a of the first passage P1 which is open to the intake collecting chamber 20, and the tubular portion 5
The peripheral wall composed of three cylindrical walls constitutes the upper funnel portion 54a forming the upstream end portion 21a, and the flare-shaped curved portions 52b of the pair of partition walls 52 and the curved portion 3 of the mounting seat 36 that face each other in the axial direction A1.
6b constitutes the funnel portion 54b on the side in the axial direction A1.

On the other hand, as shown in FIG. 8, both upper inner members 60 designed to the same specifications are arranged inside the upper outer member 40 in the axial direction A1, and the upper outer member 40 also has a left-right direction. Center plane that will be located in the center of
A division surface D that is a plan view of the upper outer member 40 with the CP2 interposed therebetween.
They are arranged in point symmetry with respect to the center point CT (intersection point of the intersection of the center plane CP1 and the center plane CP2 and the plane including the division plane D1) when viewed from 1, and each of the three screws makes the upper outer Joined to member 40.

Referring to FIGS. 1 to 3 and 8, each upper inner member 60 includes both end walls 61 and 62 in the axial direction A1 which are passage walls of the second passage P2 and inside the second passage P2. An inner wall 63, which is the other passage wall, and a partition wall 64, which is the passage wall of the second passage P2 and partitions the adjacent second passage P2, are formed. And the inner wall 63
A connecting portion 63a having a circular opening to which an air funnel 72 described later is connected is formed in a part of the, and further by the end wall 61, the partition wall 64 and the inner wall 63, or inward. The inner portion of the second passage P2 is formed by the groove formed by the wall 63 and the pair of partition walls 64 adjacent to each other. The upper inner member 60 also forms the upper chamber wall 60b of the intake air collecting chamber 20.

The upper outer member 40 and the respective upper inner members 60 are fitted to each other at the fitting portion H2, so that the second passage having a substantially rectangular passage cross section similar to the first passage P1.
P2 is formed. Explaining these second passages P2 further, on the plane including the dividing surface D1, the end portion P2a on the intake port 7 side of the second passage P2 is closer to the center plane of the intake manifold M than the end portion P2b on the first passage P1 side. It is located away from CP2 in the left-right direction. As a result, the second passages P2 of the left bank-side intake passage 21L and the right bank-side intake passage 21R, which are alternately arranged one by one in the axial direction A1 with the intake air inflow portion 46 sandwiched, are located at the left end portion of the intake manifold M. , 2nd passage P2 of intake passage 21L on the left bank side
The outer wall of the right bank intake passage 21R to the left of the outer wall 43 of the second passage P2 of the second passage P2, and at the right end of the intake manifold M, to the outside of the second bank P2 of the right bank side intake passage 21R. The wall 43 projects to the right of the outer wall 43 of the second passage P2 of the left bank-side intake passage 21L, so that both intake passages 21L and 21R are eventually displaced in the left-right direction at the left and right ends of the intake manifold M. ing.

Further referring to FIG. 9, in this embodiment, at the left end portion of the intake manifold M, the end portion P2a on the intake port 7 side of the second passage P2 which is the left end portion of the left bank side intake passage 21L is , Located on the left side of the center line N at the first passage P1 side end portion P2b of the second passage P2 that is the left end portion of the right bank side intake passage 21R, and at the right end portion of the intake manifold M,
The intake port 7 side end portion P2a of the second passage P2 which is the right end portion of the right bank side intake passage 21R is the first passage P1 side end portion P4b of the second passage P2P2 which is the right end portion of the left bank side intake passage 21L. Of the second bank P2a of the left bank side intake passage 21L is located on the right side of the center line N of the right bank side intake passage 21R. The second passage P2 does not substantially overlap the first passage P1 side end P2b, and the second bank P2 of the right bank side intake passage 21R has the intake port 7 side end P2a.
Is the first passage P1 of the second passage P2 of the left bank side intake passage 21L
Almost no overlap with the side end P2b.

Referring to FIGS. 1 and 2, the fitting portion H2 between the upper outer member 40 and each upper inner member 60 has a single step T2 and a positioning portion T3 formed on the upper outer member 40. And end portions 61a, 62a, 64a of the partition wall 64 and both end walls 61, 62 of the upper inner member 60. Specifically, the step T2 includes a single step 41a, 42a formed on both end walls 41, 42 of the upper outer member 40, and a single step 44c formed on the partition wall 44. The positioning portion T3 is formed on the partition wall 44 by a single step portion 45a formed on both inner end walls 45. Then, the tip end 61a of the end wall 61 has the stepped portions 41a, 42
a and the end portions 62a of both end walls 62 are stepped portions 45a.
The front end 64a of the partition wall 64 is fitted to the stepped portion 44c and the positioning portion T3. Steps 41a and 42a of which
As shown in FIG. 2, inside the end walls 41, 42,
The end walls 41, 42 are formed by stepped bulges 41d, 42d formed by bulging outwardly in the axial direction A1. on the other hand,
Each of the tip portions 61a, 62a, 64a has a plate shape having no step and having a flat surface.

The stepped portion 44c and the positioning portion T3 formed on the partition wall 44 will be further described with reference to FIGS. 7 and 9 to 12. Referring to FIG. 9 with reference to FIGS. 7, 10, and 11, the step portion 44c is located on the right side, which is one side in the left-right direction from the positioning portion T3 when viewed in the axial direction A1. A first step portion 44c1 including a single step portion and a second step portion 44c2 including a single step portion located on the left side which is the other side in the left-right direction from the positioning portion T3 (also see FIG. 11). See)) and. These first and second step portions 44c1 and 44c2
Is formed by a step portion formed from the inner wall 44a of the partition wall 44 to the side wall 44b, and the step portion of the side wall 44b is formed by bulging the side wall 44b outward in the axial direction A1. It is formed by a stepped bulging portion 44d.

Further, as shown in FIG. 10, the first step portion 44c1 contacts the side surface 64L on the left bank side intake passage 21L side which is one side surface of the partition wall 64 in the axial direction A1, and the second step portion 44c1 Part 44c2
11, contacts the side surface 64R on the right bank side intake passage 21R side, which is the other side surface of the partition wall 64 in the axial direction A1.

Center plane CP in the left-right direction of the intake manifold M
As shown in FIG. 9, the positioning portion T3 located at is formed by a portion where the first and second step portions 44c1 and 44c2 overlap each other when viewed in the axial direction A1. As shown in FIG. 12, in this overlapping portion, the first step portion 44c1 and the second step portion 44c2 form a pair of side wall portions in the axial direction A1, and the cross section along the axial direction A1 is concave. The protrusion amount of the positioning portion T3 from the outer wall 43 (the vertical width of the side wall portion) restricts the movement of the upper inner member 60 in the axial direction A1 with respect to the upper outer member 40. It is set to a value as small as possible within the range that can be achieved to suppress an increase in the wall thickness of the partition wall 44 due to the groove shape.

Further, the position of the positioning portion T3 is determined from the viewpoint of the effectiveness of the positioning function in consideration of the symmetry of the intake manifold M and the shape of the partition wall 44 of the upper inner member 60, and the partition wall.
From the viewpoint of suppressing an increase in the wall thickness of 44, it is set at a position close to the outer wall 43, and in this embodiment, on the center plane CP2 passing through the central portion of the partition wall 44, a second dividing surface V2 to be described later is formed. Outer part V2a
It is provided at the outermost V2a1.

As a result, a second dividing surface V2 of the upper outer member 40 and the upper inner member 60 in each second passage P2 along the second passage P2 is formed by the mating surface of the fitting portion H2. Therefore, on the second dividing surface V2, the end walls 41, 42, the partition wall 44 and the inner end wall 45, and the end walls 61, 62 and the partition wall.
Since surface contact with 64 is made, leakage of intake air is suppressed and airtightness is secured.

As shown in FIG. 9, the second dividing surface V2 (the hatched portion in the drawing) crosses the center line N when viewed from the axial direction A1, and the second dividing surface V2 An outer portion V2a located outside the center line N and separated from the center line N with the intersection V2c where V2 intersects the center line N as a boundary.
And an inner portion V2b located inward of the center line N and distant from the center line N.

In the left bank side intake passage 21L and the right bank side intake passage 21R, which are two intake passages 21 adjacent to each other in the axial direction A1, the second passage P2 is as follows:
In the central portion including the central plane CP2 of the intake manifold M, when viewed from the axial direction A1, the second intake passages 21L, 21R on the both banks side
The passages P2 overlap each other with a large width in the vertical direction as compared with the left and right ends of the intake manifold M. Therefore, in the central portion, most of the second dividing surface V2 is occupied by the outer portion V2a so that the thick wall portion of the partition wall 44 is minimized. On the other hand, the first and second stepped portions 44c1 and 44c2 are formed by the bulging portion 44d formed on the side wall 44b to form the first and second stepped portions 44c1 and 44c2 as they move away from the central portion in the left-right direction. Is formed to have almost the same thickness as the other passage walls (for example, the outer wall 43) of the upper outer member 40 without increasing the thickness of the partition wall 44.
The increase in the wall thickness of the partition wall 44 due to the formation of the second step portions 44c1 and 44c2 is suppressed as much as possible.

The description so far has been made on the cross section when the left bank side intake passage 21L is on the front side and the right bank side intake passage 21R is the rear side. Therefore, in FIG. 9, the outer portion of the second dividing surface V2 is shown. Most of V2a is located on the right side of the center plane CP2,
All of the inner part V2b of the dividing surface V2 was located on the left side of the center plane CP2, but in the cross section when the right bank side intake passage 21R is on the front side and the left bank side intake passage 21L is the back side, Most of V2a is located on the left side of the center plane CP2, and all of the inner part V2b is located on the right side of the center plane CP2.

Further, referring to FIGS. 1 to 3, the valve unit 70 is inserted into the boss portion 71 of the upper inner member 60 and screwed into the screw hole of the boss portion 65 of the upper inner member 60. It is connected by a bolt. The valve unit 70 forms an upstream end portion 23a of the short intake passage 23 to the intake collecting chamber 20 and is integrally formed with eight air funnels 72 that communicate the intake collecting chamber 20 with the second passage P2. And an intake control valve mounted in each of the air funnels 72 and fixed to the operating shaft 25.
24 and 24 are integrated. Each air funnel 72
Corresponds to the short intake passages 23 on the left bank side and the short intake passages 23 on the right bank side, which are alternately arranged in the left-right direction in the axial direction A1, and in the axial direction A1, on the left side across the center plane CP2. And the right inner side are alternately arranged, the upper inner member 60
Is connected to the connecting portion 63a (see FIG. 8). Therefore, the valve unit 70 is a member that constitutes the intake manifold M together with the main body.

Thus, as shown in FIG.
The long intake passage 22 is formed from the first to third passages P1 to P3,
The short intake passage 23 is formed by the air funnel 72, a part of the second passage P2 and the third passage P3, and the intake collecting chamber 20 is
Mainly, the lower outer member 30 and the pair of lower inner members 50
Formed from. Therefore, the short intake passage 23 joins the long intake passage 22 on the downstream side of the air funnel 72.
The long intake passage 22 and the short intake passage 23 cover the upper part of the intake collecting chamber 20. In addition, the long intake passage 22
The upstream end portion 22a of the short intake passage 23 is opened toward the left or right at the lower part of the intake collecting chamber 20, and the upstream end portion 23a of the short intake passage 23 is
At the upper part of the intake collection chamber 20, it opens downward. In addition,
If necessary, a liquid sealing material is applied to each of the fitting portions H1 and H2 in order to prevent leakage of intake air.

Next, the operation and effect of the embodiment constructed as described above will be explained. When the internal combustion engine E is operated, intake air whose flow rate is controlled by the throttle valve 11 flows into the intake collecting chamber 20 from the intake inflow portion 46 through the inflow passage 46 and the communication passage 47. When the internal combustion engine E is operating in the low speed rotation range, the intake control valve 24 is in the fully closed state, so the intake air that has flowed into the intake collection chamber 20 passes through the long intake passage 22 and the intake air flows. It reaches the port 7 and is further supplied to the combustion chamber 6 together with the fuel supplied from the fuel injection valve 90. At this time, the intake air is a long intake passage 22 having an intake passage length that provides an effective inertia supercharging effect in this engine operating range.
Since it is supplied to the combustion chamber 6 through it, high torque can be obtained with high volume efficiency. Further, when the internal combustion engine E is operating in the high speed rotation range, the intake control valve 24 is in the fully open state, so the intake air that has flowed into the intake collecting chamber 20 passes through the short intake passage 23 with a small ventilation resistance. It reaches each intake port 7, and is further supplied to the combustion chamber 6 together with the fuel supplied from the fuel injection valve 90. Also at this time, since the intake air is supplied to the combustion chamber 6 through the short intake passage 23 having the intake passage length with which an effective inertia supercharging effect is obtained in this engine operating range,
High torque can be obtained under high volume efficiency.

As described above, the intake manifold M including the intake collecting chamber 20 and the intake passage 21 is arranged inside the outer member M1 and the outer member M1 which is vertically divided into the lower outer member 30 and the upper outer member 40. A pair of lower inner members 50
And a pair of upper inner members 60 and an inner member M2 vertically divided into a pair of upper and lower inner members M2, and the first split surface V1 and the upper portion of the lower outer member 30 and the lower inner member 50 in each intake passage 21. Since the second dividing surface V2 of the outer member 40 and the upper inner member 60 is formed along the intake passage 21, the intake manifold M can be manufactured without using the core. Each intake passage 21 of the intake manifold M is formed by arranging the lower and upper inner members 50, 60 inside the lower and upper outer members 30, 40 formed by dividing the outer member M1 into upper and lower parts. As a result, not only the upper outer member 40 but also the lower outer member 30 is used to form the intake passage 21, and the lower outer member 30 is used to form the intake collecting chamber 20. Since the intake manifold M can be arranged below the space S of both banks BL and BR, even if the dead space in the space S is reduced and the maximum intake passage length and the volume of the intake collecting chamber 20 are increased, The intake manifold M can be compactly arranged in the space S, and the internal combustion engine E can be made compact. Moreover, although the lower outer member 30 is formed with the first passage P1 of the intake collecting chamber 20 and the intake passage 21 and the area of the wall forming them is increased, the pair of upper inner members 60 are By being provided side by side in the axial direction A1 inside the upper outer member 40 with the center plane CP1 interposed therebetween, a pair of lower inner members 50 are provided side by side in the lower outer member 30 with the center plane CP2 being provided side by side. Intake manifold M
Is reinforced in the axial direction A1 and the left-right direction, which are directions orthogonal to each other, so that the lower inner member 50 and the upper inner member 60 are each 1
The inner member M2 can be made lighter by the amount that the connecting portion and the like are not required to form one member, and thus the intake manifold M can be made lighter, and in addition, the outer member can be made lighter.
The rigidity of the intake manifold M having a divided structure composed of M1 and the inner member M2 can be increased, and the intake sound (transmission sound) generated when the intake air passes through the intake passage 21 is radiated to the outside of the intake manifold M. The intake noise is reduced, and the vibration resistance of the intake manifold M is also improved.

Then, in each of the plurality of intake passages 21 arranged in parallel in the axial direction A1, the first dividing surface V1 formed by the lower outer member 30 and the lower inner member 50 along the first passage P1 is The second passage formed by the upper outer member 40 and the upper inner member 60 is formed by the mating surface of the fitting portion H1 having the step T1 into which the member 30 and the lower inner member 50 are fitted. Second split surface V2 along P2
The upper outer member 40 and the upper inner member 60 are formed of the mating surfaces of the fitting portion H2 having the stepped portion T2 and the positioning portion T3, so that the outer portions of the fitting portions H1 and H2 are It is possible to increase the contact area between the member M1 and the inner member M2, prevent or suppress the leakage of intake air from the split surfaces V1 and V2, and ensure the airtightness on the split surfaces V1 and V2. It

The fitting portions H1 and H2 are a single stepped portion formed only on the lower outer member 30 and the upper outer member 40, respectively.
By having T1 and T2, it is possible to reduce the wall thickness of the partition walls 52 and 64 of the lower inner member 50 and the upper inner member 60 in which no step is formed, so that the outer member and the inner member that are fitted with each other can be formed. Comparing with the one in which the step portions are formed and fitted together, the partition walls 44, 52, 64, which are passage walls in which the fitting portions H1, H2 are formed, and the end wall 31, 32, 45, 61,
The intake manifold M is made lighter by reducing the amount of paddle 62.

In addition, when viewed from the axial direction A1, the second dividing surface V2 crosses the center line N of the intake passage 21 so that the second
Since the fitting portion H2 can be provided in a wide range outward and inward by separating the dividing surface V2 from the center line N of the intake passage 21, the intake passage 21 adjacent to the axial direction A1 and the center line N thereof are left and right. Intake manifold M, which is relatively displaced in the direction
For example, in the left bank side intake passage 21L and the right bank side intake passage 21R that are adjacent to each other in the axial direction A1, on the plane including the horizontal dividing surface D1, the end of the second bank P4 of the left bank side intake passage 21L on the intake port 7 side end. The portion P2a hardly overlaps the first passage P1 side end portion P2b of the second passage P2 of the right bank side intake passage 21R, and the intake port 7 side end portion P2a of the right bank side intake passage 21R of the second passage P2. However, even in the intake manifold M in which the first passage P1 side end portion P2b of the second passage P2 of the left bank side intake passage 21L does not substantially overlap, the intake passage 21 between the upper outer member 40 and the upper inner member 60. The intake manifold M having the second dividing surface V2 along the line can be manufactured, and the intake device of the V-type internal combustion engine E including the intake manifold M having the dividing structure that is not easily restricted by the shape of the intake manifold M is obtained. be able to.

Further, when viewed from the axial direction A1, the fitting portion H6 can be provided at the outer position apart from the center line N in the central portion of the intake manifold M.
Since the stepped portions 44c1 and 44c2 are provided, the fitting portion H6, which is thicker than the other passage walls, is provided at a position apart from the center line N to reduce the thick portion of the partition wall 44. At the same time, the weight of the intake manifold M can be reduced by increasing the number of partition walls 64 formed by the upper inner member 60 having no step.

Since the fitting portion H6 has the recessed groove-shaped positioning portion T3, the assembling property of the upper inner member 60 to the upper outer member 40 is improved, and the positioning portion T3 is seen in the axial direction A1. At this time, since it is provided at the outermost V2a1 of the outer portion V2a of the second dividing surface V2 located outside the center line N,
Even though the positioning portion T3 has a concave groove shape, it is possible to prevent the thick wall portion of the partition wall 44, which is thick because of the concave groove shape, from extending inward. The increase in wall thickness due to the formation is suppressed, and the intake manifold M is lightened.

The step T2 formed on the upper outer member 40 is
First and second step portions 44c extending in the left-right direction from the positioning portion T2
By being composed of 1, 44c2, the thickness of the fitting portion H2 is reduced by fitting using the single first and second step portions 44c1, 44c2, respectively, while the upper inner member is fitted in the fitting portion H2.
The partition wall 64 of 60 as a whole is a side surface 64 in the axial direction A1.
Since it contacts the step 44c at L and 64R, the fitting part H2
On the other hand, even when the intake pressure acts from both sides in the axial direction A1, there is a portion where the partition wall 64 is pressed against the upper outer member 40, so that the fitting portion H2 is deformed due to the action of the intake pressure. , It is suppressed that the airtightness is reduced on the second divided surface V2. Further, the positioning portion T3 can be easily formed by forming the first step portion 44c1 and the second step portion 44c2 in a portion overlapping in the axial direction A1.

The pair of lower inner members 50 and the pair of upper inner members 60 are arranged point-symmetrically to the lower outer member 30 and the upper outer member 40 respectively, that is, the pair of lower inner members 50 and the pair of lower inner members 50. By designing the upper inner member 60 to have the same specifications, each inner member 50,
Since 60 can be shared, the cost of the intake manifold M can be reduced due to the simplification of the manufacturing apparatus and the effect of mass production, and it is also advantageous in terms of maintenance such as replacement of members and costs.

The outer member M1 accommodates the lower inner member 50, the upper inner member 60 and the valve unit 70 to form the intake manifold M, so that the members accommodated in the outer member M1 can be changed. By changing the intake passage length and the passage area of the intake passage 21, and without configuring the valve unit 70, each intake passage 21 is configured by a single intake passage, without changing the outer member M1. Since the intake manifold M having various intake passage shapes can be manufactured, the cost of the intake manifold M can be reduced.

Hereinafter, an example in which a part of the configuration of the above-described example is modified will be described with respect to the modified configuration.
In the embodiment described above, the intake collecting chamber 20 is mainly formed of the lower outer member 30 and the pair of lower inner members 50. However, by utilizing the space formed below the inner wall of the upper inner member 60, It is also possible to expand the intake collection chamber 20. Further, the single step T2 may be formed only on the upper inner member 60 instead of the upper outer member 40. Internal combustion engine is 8
It may be a V-type internal combustion engine other than the cylinder.

[Brief description of drawings]

1 is a cross-sectional view of an intake device for a V-type internal combustion engine that is an embodiment of the present invention, and is a cross-sectional view taken along line I-I of FIG. 6.

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

3 is a schematic exploded perspective view of an intake manifold of the intake device of FIG.

FIG. 4 is a plan view of the lower outer member of the intake manifold of FIG. 1 viewed from above.

5 is a plan view of a lower inner member assembled to the lower outer member of FIG. 4. FIG.

6 is a plan view showing the positional relationship between the lower outer member and the lower inner member of FIG. 4, and the valve unit assembled to the upper inner member.

7 is a plan view of the upper outer member of the intake manifold of FIG. 1 viewed from below.

8 is a plan view of an upper inner member assembled to the upper outer member of FIG. 7. FIG.

FIG. 9 is a view seen from the same direction as FIG. 1, and is a view for explaining adjacent intake passages.

FIG. 10 is a sectional view taken along line XX of FIGS. 1 and 9.

FIG. 11 is a sectional view taken along line XX of FIGS. 1 and 9.

FIG. 12 is an enlarged view of a portion XII of FIG.

[Explanation of symbols]

1 ... Cylinder block, 2 ... Cylinder, 3 ... Cylinder head, 4 ... Head cover, 5 ... Piston, 6 ... Combustion chamber,
7 ... intake port, 8 ... exhaust port, 9 ... intake valve, 10 ... exhaust valve, 11 ... throttle valve, 12 ... throttle base, 13 ...
Throttle body, 20 ... Intake chamber, 21 ... Intake passage, 22
… Long intake passage, 23… Short intake passage, 24… Intake control valve,
25 ... operating shaft, 30 ... lower outer member, 31, 32 ... end wall, 33
… Outer wall, 34… Lower chamber wall, 35… Flange, 36… Mounting seat, 40
... Upper outer member, 41, 42 ... End wall, 43 ... Outer wall, 44 ...
Partition wall, 44c1, 44c2 ... Step portion, 45 ... Inner end wall, 46 ... Intake inflow portion, 47 ... Communication passage, 50 ... Lower inner member, 51 ... Inner wall, 52 ... Partition wall, 53 ... Tubular portion, 54a, 54b ... Funnel portion, 60 ... Upper inner member, 61, 62 ... End wall, 61a, 62a ...
Tip part, 63 ... Inner wall, 64 ... Partition wall, 64a ... Tip part, 65 ...
Boss portion, 70 ... Valve unit, 71 ... Boss portion, 72 ... Air funnel, 73 ... Body, 90 ... Fuel injection valve, 91 ... Exhaust introduction pipe,
92 ... Actuator, 93 ... Bracket, 94 ... Rod, 95
... Link lever mechanism, 96 ... Negative pressure extraction pipe, E ... Internal combustion engine, CL, CR ... Cylinder row, BL, BR ... Bank, A1 ... Axial direction, S ... Space, M ... Intake manifold, M1 ... Inner member,
M2 ... Outer member, D1, D2 ... Dividing surface, F1-F4 ... Hole, P1-P3
… Passage, CP1, CP2… Center plane, CT… Center point, H1, H2… Fit part, T1, T2… Step, T3… Positioning part, N… Center line, V1,
V2 ... split plane.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 7 Identification code FI theme code (reference) F02M 35/10 301P 301R (72) Inventor Nobuyuki Imai 1-4-1 Chuo Wako, Saitama Prefecture Stock Company Honda Technical Research Institute (72) Inventor Kenji Yokotsuka 22-30 Honmachi, Wako-shi, Saitama F-term in Mets Co., Ltd. (reference) 3G031 AA02 AA28 AB07 AB08 AC03 AD07 BA07 BA10 BA14 BB05 DA03 DA12 DA37 EA02 FA03 GA05 HA01 HA04 HA09 HA10 HA11

Claims (5)

[Claims]
1. A pair of banks formed by arranging a predetermined number of cylinders in parallel in the axial direction of a crankshaft are arranged in a space formed between both banks of a V-shaped internal combustion engine. An intake manifold for a V-type internal combustion engine, comprising: an intake manifold; and a predetermined number of intake passages connected to the intake manifold and arranged in parallel in the axial direction, wherein the intake manifold is an outer manifold. A member and an inner member arranged inside the outer member, the outer member is divided into a lower outer member and an upper outer member, and the inner member is a pair of lower parts. The inner member and a pair of upper inner members are vertically divided, and the pair of lower inner members are arranged inside the lower outer member side by side in the left-right direction orthogonal to the axial direction. Upper Inn The members are axially arranged inside the upper outer member, the intake collecting chamber is formed by at least the lower outer member and the pair of lower inner members, and each of the intake passages includes the lower portion. An outer member and the lower inner member, and an upper outer member and the upper inner member, and a first dividing surface of the lower outer member and the lower inner member in each of the intake passages, the upper outer member, and An intake device for a V-type internal combustion engine, wherein a second dividing surface with the upper inner member is formed along the intake passage.
2. The mating surface at a fitting portion having a single step portion formed on only one of the upper outer member and the upper inner member fitted to each other. 2. The intake system for a V-type internal combustion engine according to claim 1, wherein the intake system is configured by the above, and when it is viewed from the axial direction, it intersects the center line of the intake passage.
3. The step portion is formed in the upper outer member, and the fitting portion is an outer portion of the second divided surface located outside the center line when viewed from the axial direction. 7. A cross-section along the axial direction has a groove shape at the outermost part of, and a positioning portion is provided for restricting the movement of the upper inner member with respect to the upper outer member in the axial direction. 2. An intake device for a V-type internal combustion engine according to item 2.
4. The first step portion, which is formed on one side in the left-right direction from the positioning portion, and is in contact with one side surface of the upper inner member in the axial direction, and the step portion. A second step portion formed on the other side in the left-right direction and in contact with the other side surface in the axial direction of the upper inner member, and the positioning portion includes the first and the second step portions when viewed in the axial direction. The intake system for a V-type internal combustion engine according to claim 3, wherein the second step portion is formed by an overlapping portion.
5. The pair of lower inner members are arranged inside the lower outer member in point symmetry with respect to a center point of the lower outer member in a plan view, and the pair of upper inner members include: The V-type internal combustion engine according to any one of claims 1 to 4, wherein the V-type internal combustion engine is arranged inside the upper outer member in point symmetry with respect to a center point of the upper outer member in plan view. Intake device.
JP2001331326A 2001-10-29 2001-10-29 Intake device for V-type internal combustion engine Expired - Fee Related JP3901492B2 (en)

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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001331326A JP3901492B2 (en) 2001-10-29 2001-10-29 Intake device for V-type internal combustion engine

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JP3901492B2 JP3901492B2 (en) 2007-04-04

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007009883A (en) * 2005-07-04 2007-01-18 Honda Motor Co Ltd Intake control device for engine
JP2007315245A (en) * 2006-05-24 2007-12-06 Nissan Motor Co Ltd Intake device of v-type internal combustion engine
EP1748167A3 (en) * 2005-07-04 2012-04-25 Keihin Corporation Engine intake control device

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007009883A (en) * 2005-07-04 2007-01-18 Honda Motor Co Ltd Intake control device for engine
JP4625379B2 (en) * 2005-07-04 2011-02-02 本田技研工業株式会社 Engine intake control system
EP1748167A3 (en) * 2005-07-04 2012-04-25 Keihin Corporation Engine intake control device
JP2007315245A (en) * 2006-05-24 2007-12-06 Nissan Motor Co Ltd Intake device of v-type internal combustion engine
JP4692389B2 (en) * 2006-05-24 2011-06-01 日産自動車株式会社 Intake device for V-type internal combustion engine

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