JPH04350354A - Air intake device for engine - Google Patents

Abstract

PURPOSE:To improve the assembling performance of an intake system to a V-engine while making the engine compact. CONSTITUTION:The respective independent intake passages of a V-engine 1 are connected to collectors 9f, 9r by banks Bf, Br. The respective upstream sides of these collectors 9f, 9r are collected into one upstream side collecting part 11, and each collecting part is disposed above the rear side bank Br. An intake manifold 8 formed between the respective independent intake passages 7 and the upstream side collecting part 11. is divided into a front side divided intake manifold 8f and a rear side divided intake manifold 8r, and the respective divided intake manifolds 8f, 8r are disposed vertically. Fastening parts 91, 94, to which the respective divided intake manifolds 8f, 8r are mutually connected, are provided in the respectively corresponding positions, and the fitting threaded hole 7a of the front side divided intake manifold 8f is set larger in diameter than the fitting threaded hole 7b of the rear side divided intake manifold 8r.

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 multi-cylinder engine, and more particularly to an intake structure for a V-type engine.

0002

[Prior Art] Conventionally, in V-type engines, various arrangements have been made regarding the arrangement of the intake passages from both banks and their gathering parts, etc., for the purpose of making the engine more compact and making extensive use of the dynamic effect of the intake air. Proposed. As one technique, for example, as disclosed in Japanese Utility Model Application Publication No. 2-54359, each independent intake passage is connected to a collecting part for each bank, and furthermore, the upstream of the collecting part for each bank is collected, A device in which each of the above-mentioned gathering portions is arranged above the bank on one side is known. In addition, as an engine intake device that utilizes the dynamic effect of intake air, for example, JP-A-62
- As disclosed in Publication No. 101820, it has two cylinder rows, and each cylinder row is provided with a chamber as an independent collecting section, and two long and short independent intake passages from each cylinder are connected to the chamber. At the same time, each of the above-mentioned chambers is arranged between the cylinder rows, and a communication passage is provided to communicate the chambers with each other, and an on-off valve for opening and closing each of the above-mentioned independent intake passages and the communication passage is provided, and the on-off valve is It is known that the dynamic effect of the intake air can be utilized over a wide engine speed range by opening and closing appropriately.

0003

[Problems to be Solved by the Invention] However, in the arrangement in which each gathering portion is arranged between cylinder rows (between banks) as described in the above-mentioned Japanese Patent Application Laid-Open No. 101820/1982, the length of each independent intake passage is limited to a certain extent. In order to ensure the above, the layout becomes complicated or the intake system passage is extended upward, increasing the overall height of the engine. Furthermore, there is a problem in that the space between both banks is reduced, making it difficult to attach each independent intake passage at the downstream end of the intake passage to the cylinder head, resulting in poor assembly performance.

[0004] On the other hand, the above-mentioned problem can be improved by arranging each collecting portion above one side bank as described in the above-mentioned Japanese Utility Model Publication No. 2-54359. However, in general, each of the independent intake passages and each gathering part is often formed integrally, and in that case, each gathering part, etc. is placed on one side, so the center of gravity is offset and the weight is considerable. Therefore, when attaching the cylinder head to the cylinder head, it is necessary to temporarily attach the cylinder head while supporting one side of the cylinder head, and then fix the cylinder head, which takes time and effort, and there is a demand for improved ease of assembly.

The present invention has been made in view of the above points, and its object is to connect each independent intake passage to a gathering part for each bank in a V-type engine.
The purpose of this invention is to aggregate the upstream parts of the collecting parts and arrange the collecting parts above one side of the bank to make the engine more compact and to improve the ease of assembling the intake system to the engine.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the solving means taken by the invention of claim 1 is to provide a V-shaped V-shaped bank with a first bank and a second bank each having a cylinder row.
An independent intake passage that communicates independently with each cylinder of a type engine is connected to a downstream collecting part for each bank, and the upstream of the downstream collecting part for each bank is collected in the upstream collecting part, and each of the above-mentioned The present invention is based on an engine intake system in which the gathering portion is disposed above the first bank. The intake manifold that constitutes the area from each of the independent intake passages to the upstream collecting part is divided into two parts, and the first divided intake manifold connects each independent intake passage of the first bank to the downstream collecting part. The second divided intake manifold is formed integrally from the upstream collecting section to the downstream collecting section of the second bank. The first divided intake manifold is arranged on the lower side, and the second divided intake manifold is arranged on the upper side, and there is a fastening section where both of the divided intake manifolds are connected to each other. are provided in positions facing each other, and the screw holes for attaching the second divided intake manifold to the engine body are set to have a larger diameter than the screw holes for attaching the first divided intake manifold to the engine body. do.

Furthermore, in the invention of claim 2, in the invention of claim 1, the downstream gathering portion of each bank is a small gathering portion with a small volume, and the independent intake passages are gathered and set to have the same length. The small aggregates are configured to communicate with each other through a communication path that forms a resonance space.

In the invention of claim 3, in addition to the structure of the invention of claim 2, each of the small collecting parts and the upstream collecting part are connected by a collecting passage, and the collecting passage has an upstream side that connects both sides. It is bent toward the inter-bank side, and the fastening surface of the fastening portion is oriented diagonally with respect to the cylinder row direction when viewed from above.

[0009]

[Operation] According to the above structure, in the invention of claim 1, the intake manifold that constitutes from each independent intake passage to the upstream gathering part is divided into two for each bank, so that each divided intake manifold is divided into two. Each of the divided intake manifolds is attached to the engine body separately and is lighter than an integrated intake manifold, so the installation work becomes easier and the ease of assembly is improved. In addition, the first divided intake manifold connected to the first bank is placed on the lower side, and the second
Since the second divided intake manifold connected to the bank is placed above and below, the space above the bank is effectively used and the extension of the intake manifold in the cylinder row direction (output shaft direction) is suppressed. Compactness is achieved.

Furthermore, when assembling the above-mentioned intake manifold to the engine body, first the lower first divided intake manifold is attached to the engine body, and then the upper second divided intake manifold is attached to the engine body. This allows the lower second split intake manifold to be easily installed. In addition, fastening portions for connecting both of the above-mentioned divided intake manifolds are provided at corresponding positions,
The screw holes for attaching the second divided intake manifold to the engine body are set to have a larger diameter than the screw holes for attaching the first divided intake manifold to the engine body. When connecting the divided intake manifolds to each other, installation errors and variations can be absorbed by the screw holes for attaching the second divided intake manifold to the engine body, which will be installed later on the engine body, making the above-mentioned connection easier. This improves ease of assembly.

Further, in the invention of claim 2, the downstream gathering portion of each bank is a small gathering portion with a small volume, and the independent intake passages are gathered together and connected to each other with equal lengths. The distribution of intake air to the cylinders is improved, and the resonance effect and inertia effect of intake air to each cylinder are made uniform. Furthermore, since the above-mentioned small collecting parts are communicated with each other through communication passages that form resonance spaces, the intake air is in a predetermined engine speed range, and the openings of the above-mentioned small collecting parts to the communication passages are used as pressure reversal parts. Supercharging is achieved by the resonance effect in which the communication passage is used as a resonance space, and an inertia effect is also obtained in which the opening is used as a pressure reversal part, thereby effectively improving the output. Further, since the small gathering parts are connected to each other by the communication passage, the joint rigidity of the first and second divided intake manifolds is improved.

Furthermore, in the invention of claim 3, each of the small collecting parts and the upstream collecting part are connected to each other by a collecting passage, and the collecting passage has an upstream side bent toward the inter-bank side. This prevents the intake passage from extending in the width direction of the engine, making it more compact. In addition, since the fastening surface of the fastening portion is oriented diagonally with respect to the cylinder row direction when viewed from above, when the first and second split intake manifolds are fastened together, each split intake manifold is An error in the position of the fastening portion of the manifold will not be biased in the direction of the cylinder row or in the direction orthogonal to the cylinder row, making the fastening easy and improving the ease of assembly.

[0013]

Embodiments Hereinafter, embodiments of the present invention will be explained based on the drawings.

FIGS. 1 and 2 show the overall structure of an engine intake system according to an embodiment of the present invention. Reference numeral 1 indicates a crankshaft (not shown) connected to the vehicle body in the vehicle width direction (vertical direction in FIG. 2). This engine 1 is a V-type six-cylinder engine mounted horizontally in a vehicle.The engine 1 has a pair of front banks Bf and rear banks Br that face each other in the longitudinal direction of the vehicle. The engine 1 includes a cylinder block 2 having a substantially V-shaped cross section, a pair of front and rear cylinder heads 3f, 3r assembled on the upper surface of the cylinder block 2, each cylinder head 3f,
Cylinder head cover 4f assembled on the top surface of 3r
, 4r. The front bank Bf has the second and fourth banks.
and the sixth three cylinders 52, 54, 56, and the rear bank Br has the first, third and fifth three cylinders 51,
53 and 55 are arranged and formed in series in the bank length direction, respectively. The rear side of the front cylinder head 3f (
Three intake ports 6, 6, . . . whose downstream ends communicate with the respective cylinders 52, 54, 56 of the front bank Bf are formed on the side surface of the side between the banks Bf and Br. On the other hand, similarly, the front side of the rear cylinder head 3r (the side between banks Bf and Br)
On the side, each cylinder 51, 53, 55 of the rear bank Br is shown.
Three intake ports 6, 6, .

Each of the intake ports 6 is connected to the downstream ends of independent intake passages 7, 7, . The individual intake passages 7 are collectively connected to collectors 9f and 9r, respectively, and the pipe lengths of the independent intake passages 7 are made equal to each other. The downstream ends of collecting passages 10f and 10r are connected to the collectors 9f and 9r, respectively, and the upstream ends of these collecting passages 10f and 10r are collectively connected to an upstream collecting portion 11. An intake manifold 8 is configured from each of the independent intake passages 7 to the upstream gathering portion 11. This intake manifold 8 is arranged above the engine 1, and the collectors 9f and 9r for each bank Bf and Br are both above the rear bank Br and are connected to the bonnet line L that indicates the rear bank Br and the underside of the hood of the vehicle body. is located between. Specifically, the collector 9f of the front bank Bf is arranged above the front end of the cylinder head cover 4r of the rear bank Br, and the collector 9f of the front bank Bf is arranged above the front end of the cylinder head cover 4r of the rear bank Br.
The collector 9r is disposed above the rear end of the cylinder head cover 4r of the rear bank Br at a lower height position than the front collector 9f, and the collectors 9f, 9r
Both have a vertical arrangement with their centers located between the third cylinder 53 and the fifth cylinder 55 of the rear bank Br.

As shown in FIGS. 3 and 4, the intake manifold 8 includes front and rear divided intake manifolds 8f and 8 connected to the banks Bf and Br, respectively.
The front divided intake manifold 8f, which is divided into r and connected to the front bank Bf, is disposed on the upper side of the above-mentioned vertical arrangement, and as shown in FIG. 3, is connected to the front bank Bf. Independent intake passages 7, 7,... connected to the intake port 6, respectively, and these independent intake passages 7, 7,...
and a collector 9f that collects and connects the upstream ends of the air intake passages 7 and the collector 9f, and each of the independent intake passages 7 and the collector 9f are integrally connected. Here, integrally connected means a case where the parts are integrally formed by casting or the like, or are connected in a way that cannot be disassembled by welding or the like. A mounting flange 7f is formed at the downstream end of each of the independent intake passages 7 for connection to each of the intake ports 6, and the mounting flange 7f
Attachment screw holes 7a, 7a, . . . are formed so as to be fastened with bolts to the attachment surface of the cylinder head 3f of the front bank Bf where the intake port 6 opens. The mounting screw holes 7a, 7a, . . . are formed to have a larger diameter than the mounting screw holes 7b, 7b, . The collector 9f is provided with a fastening portion 91 for connecting with the collective passage 10f, which is an intake passage on the upstream side, and the fastening surface 91a thereof is arranged diagonally with respect to the direction of the cylinder row in FIG. It is formed slightly toward the rear of the vehicle body than the rear side of the row. Furthermore, the collector 9f
A communication path connecting portion 92 is formed in the connecting portion 92, which is open to communicate with the center of the collector 9f, and whose opening direction is directed toward the rear of the vehicle body.

On the other hand, the rear divided intake manifold 8r connected to the rear bank Br is disposed at the lower side of the above-mentioned vertical arrangement, and as shown in FIG.
It is composed of independent intake passages 7, 7, . The independent intake passage 7 and the collector 9r are integrally connected. A collection passage 10r, which is an intake passage on the upstream side, is integrally connected to the collector 9r.Furthermore, the upstream end of this collection passage 10r is integrally connected to an upstream collection part 11, Side gathering part 1
1 is also integrally connected to the upstream end of the collective passage 10f of the front bank Bf. A mounting flange 7r is formed at the downstream end of each of the independent intake passages 7 for connection to each of the intake ports 6, and the mounting flange 7r is attached to the cylinder of the rear bank Br where the intake port 6 opens. head 3
Mounting screw holes 7b, 7b, . . . are formed so as to be fastened to the mounting surface of r with bolts. A fastening part 94 connected to the fastening part 91 of the collector 9f of the front bank Bf is formed at the downstream end of the collecting passage 10f, corresponding to the fastening part 91 of the collector 9f. The respective divided intake manifolds 8f and 8r are connected to each other at fastening portions 91 and 94. The collector 9r is formed with a communication passage connecting portion 93 that is open to communicate with the center of the collector 9r and whose opening direction is directed upward. Further, each independent intake passage 7 connected from the intake port 6 of each cylinder of the rear bank Br to the collector 9r is connected to the plug hole 1 of each cylinder.
The plug holes 13 are formed so as to pass above the plug holes 13 while avoiding the plug holes 13. That is, in FIG.
The independent intake passages 7, 7 connected to the cylinders 51, 53 are the first
The independent intake passage 7 that passes between the plug hole 13 of the cylinder 51 and the plug hole 3 of the third cylinder 53 and is connected to the fifth cylinder is connected to the plug hole 13 of the third cylinder 53 and the plug hole 3 of the fifth cylinder 55. They pass above the holes 13 and are connected to the collectors 9r, respectively.

Each end of the L-shaped communication path 12 is connected to the communication path connection portions 92, 93 of each of the collectors 9f, 9r, and the center portions of the collectors 9f, 9r are connected to each other. It is now possible to communicate. Above communication path 1
At the end of No. 2 on the side connected to the collector 9r, there is a communication path 1.
An on-off valve 14 is provided to open and close the on-off valve 2, and the on-off valve 14 is opened and closed by a negative pressure actuator (not shown) connected to the valve shaft via a rod. That is,
The on-off valve 14 is closed in the engine low and medium speed range,
The valve opens in the high engine speed range.

The collecting passages 10f and 10r extend from the respective collectors 9f and 9r toward the rear of the cylinder row, and then bend toward the side between the banks Bf and Br and are formed diagonally toward the front of the vehicle body. are collected and connected to the upstream collecting section 11. A support portion 11a is formed at the lower part of the upstream gathering portion 11, and this support portion 11a is fixed to a mounting boss 31 provided at the rear end of the cylinder row of the rear cylinder head 3r. A support boss 93a is formed in the lower part of the collector 9r of the rear bank Br near the communication path connecting portion 93 and extends downward, and the support boss 93a is connected to the rear via the bracket 15 as shown in FIG. It is fixed to a mounting boss 32 formed on the rear side surface of the side cylinder head 3r.

Therefore, in the above embodiment, each collector 9f, 9r collectively connects the independent intake passages 7, 7, . are both placed above the rear bank Br, so the dead space above the rear bank Br and the bonnet can be effectively used. By making the intake passages 7 follow the bonnet line L, the overall height of the engine can be suppressed while ensuring a certain length for each independent intake passage 7. Furthermore, since the centers of both collectors 9f and 9r are located between the third cylinder 53 and the fifth cylinder 55, which are approximately at the longitudinal center of the rear bank Br, and are arranged vertically, the intake manifold 8 has an output It does not protrude beyond the main body of the engine 1 in the axial direction (bank longitudinal direction), and the collecting passages 10f and 10r are connected to the collector 9.
The intake manifold 8 extends toward the rear of the cylinder row from banks Bf and 9r, and then bends toward the side between banks Bf and Br and is formed diagonally forward of the vehicle body, so that the intake manifold 8 extends in the width direction of the engine. The length can also be reduced. For these reasons, the engine 1 can be made more compact.

[0021] Furthermore, the intake manifold 8 constituting the area from each of the independent intake passages 7 to the upstream gathering portion 11 is divided into front and rear divided intake manifolds 8f and 8r connected to each bank Bf and Br, respectively. Therefore, each of the divided intake manifolds 8f and 8r can be separately attached to the engine body, and each of the divided intake manifolds 8f and 8r can be made considerably lighter than an integrated intake manifold. The installation work can be facilitated. Furthermore, the rear divided intake manifold 8r connected to the rear bank Br is placed on the lower side, and the front divided intake manifold 8f connected to the front bank Bf is placed on the upper side. By attaching the rear divided intake manifold 8r to the engine 1 body, and then attaching the upper front divided intake manifold 8f to the engine 1 body, the lower rear divided intake manifold 8r can be easily attached. Furthermore, the mounting screw holes 7a, 7a, . . . formed in the mounting flange 7f of the front divided intake manifold 8f are connected to the mounting screw holes 7b, 7b, . . . formed in the mounting flange 7r of the rear divided intake manifold 8r. Since it is formed to have a large diameter, when the fastening parts 91 and 94 of each of the divided intake manifolds 8f and 8r are fastened, positional deviations of the fastening surfaces due to installation errors and variations can be avoided later on in the engine 1.
This can be absorbed by the mounting screw holes 7a, 7a, . . . of the front divided intake manifold 8f attached to the main body, and the above-mentioned fastening can be easily performed. In addition, the fastening portion 91
Since the fastening surface 91a is formed diagonally with respect to the direction of the cylinder row, the position of the fastening surface will not shift in the direction of the cylinder row or in the direction perpendicular to the cylinder row, and the mounting screw holes 7a, 7a, It is possible to easily absorb the positional deviation due to..., and therefore the above-mentioned fastening can be performed even more easily. Further, since the communication passage 12 is formed in an L-shape, it is possible to easily connect the communication passage connecting portions 92, 93 of each collector 9f, 9r, and the communication passage 12 allows each collector 9f, 9r to be easily connected to the communication passage connecting portion 92, 93. Since the two intake manifolds 9r are connected to each other, the joint rigidity of the divided intake manifolds 8f and 8r can be improved.

[0022] Also, in the engine low and medium speed range, the on-off valve 1
4 is closed, the intake air is supercharged by a resonance effect in which the upstream collecting section 11 is used as a pressure reversal section and the collecting passages 10f and 10r are respectively resonant spaces. In addition, in the engine high speed range, the on-off valve 14 opens and the communication passage 1
2 is opened, so the intake air is from each collector 9.
Supercharging is achieved by a resonance effect in which the opening of the connecting portion between f, 9r and the communication passage 12 is used as a pressure reversal part, and the communication passage 12 is used as a resonance space. Furthermore, the intake air is also supercharged by an inertial effect using the opening as a pressure reversal section. In addition, since each of the independent intake passages 7 is set to have the same length and is collected in collectors 9f and 9r, which are small collecting parts, it is possible to improve the distribution of intake air to each cylinder. , the above dynamic effect of intake air can be obtained without variation among the cylinders. For these reasons, the dynamic effect of intake air can be effectively utilized over a wide range of engine speeds.

[0023]

As explained above, according to the engine intake system according to the invention of claim 1, each independent intake passage of a V-type engine is connected to the downstream gathering part for each bank, and The upstream parts of the downstream collecting parts of the above are assembled in the upstream collecting part, and each of the collecting parts is arranged above the first bank, and the intake manifold that constitutes from each of the independent intake passages to the upstream collecting part is arranged for each bank. Divide into two and form.
Since the first divided intake manifold connected to the first bank is arranged on the lower side and the second divided intake manifold connected to the second bank is placed on the upper side, the length of each independent intake passage is It is possible to make the engine more compact by reducing the overall height of the engine while ensuring a certain degree of height, and the weight of each of the above-mentioned divided intake manifolds can be reduced.Also, by being able to install each of the divided intake manifolds separately, it is possible to reduce the size of the intake manifold. It can be easily attached to the engine body. In addition, since the diameter of the mounting screw holes of the second divided intake manifold is set large, when connecting the above-mentioned respective divided intake manifolds, installation errors and variations can be avoided when installing the second divided intake manifold. It can be absorbed by the screw hole, and the above-mentioned fastening can be easily performed. Therefore, the ease of assembling the intake manifold to the engine body can be improved.

Further, in the invention of claim 2, in addition to the effects of claim 1, the downstream gathering portion of each bank is made into a small gathering portion with a small volume, and the independent intake passages are gathered together and have equal lengths. Since they are set and connected, it is possible to improve the distribution of intake air to each cylinder and to equalize the resonance effect and inertia effect of intake air for each cylinder. Furthermore, since each of the small gathering parts are communicated with each other through a communication passage forming a resonance space, the intake air is supercharged in a predetermined engine speed range by a resonance effect using the communication passage as a resonance space, It is possible to improve engine output. Further, since the small gathering parts are connected to each other by the communication passage, the joint rigidity of the first and second divided intake manifolds can be improved.

Furthermore, in the invention of claim 3, in addition to the effect of claim 2, each small gathering portion and the upstream gathering portion are connected by a gathering passage, and the upstream side of the gathering passage is connected between the banks. Since it is bent to the side, it is possible to prevent the upstream intake passage from extending in the width direction of the engine, thereby making the engine more compact in the width direction. Furthermore, since the fastening surfaces of the fastening portions of each divided intake manifold are oriented diagonally with respect to the direction of the cylinder row, when connecting the first and second divided intake manifolds, it is necessary to Errors in the position of the fastening portions are not biased in the cylinder row direction or in the direction perpendicular to the cylinder rows, making the fastening easier and improving the ease of assembly.

[Brief explanation of the drawing]

FIG. 1 is a side view showing the overall configuration of an engine intake device according to an embodiment of the present invention.

FIG. 2 is a plan view showing the overall configuration of an engine intake device according to an embodiment of the present invention.

FIG. 3 is a plan view of the front divided intake manifold.

FIG. 4 is a plan view of the rear divided intake manifold.

FIG. 5 is a sectional view of main parts.

[Explanation of symbols]

1 Engine 7 Independent intake passages 7a, 7b Mounting screw holes 8 Intake manifold 8f Front divided intake manifold (second divided intake manifold) 8r Rear divided intake manifold (first divided intake manifold) 9f, 9r Collector (small collection) part, downstream collecting part) 10f, 10r collecting passage 11 upstream collecting passage 12 communicating passage 14 on-off valves 51 to 56 1st to 6th cylinders 91, 94 fastening part 91a fastening surface Bf front bank (second bank) Br rear Side bank (first bank)

Claims (3)

[Claims] Claim 1: A first bank and a second bank each having a cylinder row.
An independent intake passage that communicates independently with each cylinder of a V-type engine formed in a V-shape with a bank is connected to a downstream collecting part for each bank, and an intake passage upstream of the downstream collecting part for each bank In an engine intake system in which the above-mentioned respective above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned above-mentioned sections are arranged in the upstream side gathering part above the first bank, the intake manifold which constitutes each above-mentioned independent intake passage to the upstream side gathering part is divided into two. The first divided intake manifold extends from each independent intake passage of the first bank to the upstream collecting part via the downstream collecting part, and from the upstream collecting part to upstream of the downstream collecting part of the second bank. are integrally formed, the second divided intake manifold is integrally formed from each independent intake passage of the second bank to the downstream gathering part, and the first divided intake manifold is formed below, The second divided intake manifolds are arranged above and below, and the fastening parts where the two divided intake manifolds are connected are provided at positions facing each other, and the second divided intake manifolds are connected to the engine body. An intake device for an engine, wherein a screw hole for attaching the first divided intake manifold to the engine body is set to have a larger diameter than a screw hole for attaching the first divided intake manifold to the engine body. Claim 2: The downstream collecting part of each bank is a small collecting part with a small volume, each independent intake passage is collected and set to the same length, and each of the small collecting parts forms a resonance space. 2. The engine air intake system according to claim 1, wherein the intake system is connected to the engine through a communication passage. [Claim 3] Each of the small collecting parts and the upstream collecting part are connected to each other by a collecting passage, and the collecting passage has an upstream side bent toward the side between both banks, and the fastening surface of the fastening part is connected from above. 3. The engine intake device according to claim 2, wherein the engine intake device is oriented obliquely with respect to the cylinder row direction in plan view.