JP2003322059A - Suction manifold - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a suction manifold for an engine of horizontally laid type whose fuel pipe is arranged in the front of a cylinder head in which the fuel pipe is protected against a damage when the vehicle goes in a head-on collision through utilization of the suction manifold positioned ahead of the cylinder head. <P>SOLUTION: The suction manifold 20 is to introduce the suction air from the front to the engine of horizontally laid type in which the fuel supply pipe Fp is installed sideways facing in the front of the cylinder head Eh and includes a plurality of suction outlet pipe parts 22 positioned downstream of the suction inlet pipe part 21 and coupled with the cylinder head, wherein each suction outlet pipe part 22 is equipped with a first pipe part 23 extending in the vertical direction and confronting the forefront of an engine room, a second pipe part 24 extending in the direction fore and aft in the downstream of the first pipe part, and a third pipe part 25 extending downward aslant to the rear in the downstream of the second pipe part, and the third pipe part is coupled with the cylinder head below the fuel supply pipe in such a way that its part in front of the coupling part is positioned ahead of the vehicle more than the fuel supply pipe. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake manifold, and more particularly to an intake manifold for introducing intake air into a so-called horizontal type engine.

[0002]

2. Description of the Related Art As is well known, there is a so-called front engine-front drive system (FF system) vehicle in which an engine is mounted on a front portion of a vehicle to drive front wheels, and the engine is installed horizontally. In this case, the engine
In the engine room at the front of the vehicle, the cylinder rows are laid out so as to extend substantially along the vehicle width direction.

By the way, in recent years, with the further increase in engine exhaust gas regulations, there has been a demand for activating the catalyst of the exhaust gas purifying apparatus earlier. In the case of a horizontal type engine, in order to quickly activate the catalyst, it is desirable to supply air from the front side of the vehicle to the cylinder and discharge the air rearward, that is, so-called front intake / rear exhaust. By adopting such intake and exhaust system,
Compared with the rear intake / front exhaust system, the distance from the exhaust port to the catalyst device can be made shorter, so that the catalyst can be activated earlier.

An intake manifold for introducing intake air into each cylinder of the engine is basically connected to an intake inlet pipe portion connected to an air supply source and a cylinder head of the engine located downstream of the intake inlet pipe portion. However, if the front intake / rear exhaust intake / exhaust system is adopted, the intake manifold is
At least the main part of the intake / outlet pipe portion is located in front of the cylinder head, and is connected to the upper portion of the cylinder head from above and above.

In such a layout, the fuel supply pipe for supplying fuel into each cylinder is arranged so as to extend substantially parallel to the cylinder row on the vehicle front side of the cylinder head that constitutes the upper part of the engine. Is convenient for laying out the pipe. However, in the case of such a layout, since the fuel supply pipe is located in front of the engine, it is necessary to give sufficient consideration to the protection of the fuel system when the vehicle collides head-on.

In the present specification, the term "upstream side" or "downstream side" of an intake system of an engine including an intake manifold or each part thereof means the direction of flow of intake air flowing through the intake manifold or intake pipe. The side where the intake air goes into the cylinder of the engine is called the "downstream side".

[0007]

Therefore, when the fuel pipe is laid out so as to extend substantially parallel to the cylinder row on the vehicle front side of the cylinder head as described above, the cylinder head of the cylinder head is arranged as described above. It would be very convenient if the fuel system could be protected in the event of a frontal collision of the vehicle by using the intake manifold arranged in the front.

Although the layout of the fuel pipe is not specified, an intake manifold is used to improve the impact absorption characteristics at the time of a collision. For example, in Japanese Patent Laid-Open No. 8-246968, A configuration is disclosed in which a fragile portion extending in the axial direction is provided in the manifold, and in the event of a collision, the intake manifold is destroyed along the fragile portion so that a large crash stroke can be obtained. However, in this conventional technique, even if the fuel pipe is laid out on the front side of the cylinder head in a horizontal type engine, the front side of the vehicle of the fuel pipe itself cannot be covered and the fuel It is difficult to adequately protect pipes.

In view of the above, the present invention utilizes a intake manifold located in front of the cylinder head when a fuel pipe is laid out on the front side of the cylinder head in a horizontal type engine and is used in the event of a frontal collision of a vehicle. The purpose was to protect the fuel pipes in Japan more effectively.

[0010]

For this reason, the intake manifold according to the present invention is arranged laterally in the engine room of the vehicle so that the cylinder rows extend substantially along the vehicle width direction, and the cylinder head is located in front of the vehicle. A fuel supply pipe for supplying fuel into each cylinder on the side of the cylinder, the intake air is introduced into each of the cylinders from the front side of the vehicle with respect to the engine in which the fuel supply pipe is arranged substantially parallel to the cylinder row. Also, the intake manifold includes an intake inlet pipe portion connected to an air supply source, and a plurality of intake outlet pipe portions located downstream of the intake inlet pipe portion and connected to the cylinder head of the engine. The plurality of intake outlet pipe portions are connected to the intake inlet pipe portion on the upstream side, extend substantially vertically, and face a front end wall portion of the engine room, and a first pipe portion of the first pipe portion. A second pipe portion located on the downstream side and extending substantially in the vehicle front-rear direction; and a third pipe portion located on the downstream side of the second pipe portion and extending substantially rearward and obliquely downward,
Each has. A rear end of the third pipe portion is connected to a lower portion of the cylinder head than the fuel supply pipe, and at least a part of a front side of the connection portion is located on a vehicle front side of the fuel supply pipe. It is characterized by that.

In this case, it is preferable that the first pipe portion of each intake / outlet pipe portion is set such that its front portion has lower rigidity than its rear portion. Also,
More preferably, the second pipe portion of each intake / outlet pipe portion is set so that its front portion has lower rigidity than its rear portion. Furthermore, in the above cases, more preferably, the third pipe portion of each intake outlet pipe portion is
The rigidity is set to be higher than that of the first pipe portion or the second pipe portion.

In the above case, more preferably, the center of each intake outlet pipe section in the vertical direction of the first pipe section is located above the center of the front end portion of the engine room in the vertical direction. . Further, in the above cases, more preferably, the alternator is arranged on one side of the intake manifold in the vehicle width direction, and the main body of the intake throttle valve is arranged on the other side.

Furthermore, in the above case, more preferably, a pair of left and right side frames extending in the vehicle front-rear direction are arranged on both sides of the engine room in the vehicle width direction, and front end portions of these side frames are It is located in front of each of the intake air outlet pipe portions. Furthermore, in the above cases, more preferably, the engine is arranged such that the axial centerline of each cylinder extends obliquely upward from the front downward.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. FIG. 1 is a side explanatory view schematically showing the inside of an engine room of a vehicle (automobile) equipped with an engine in which an intake device having an intake manifold according to the present embodiment is assembled, and FIGS. FIG. 3 is a front explanatory view and a plan explanatory view of the intake device. 4 is an enlarged side view showing the engine and its intake device, and FIG. 5 is an explanatory side view from the opposite direction to FIG.

As shown in these figures, a radiator 2 is attached to a front end of an engine room 1, and an engine E is arranged behind the radiator 2 by a predetermined distance (to the right in FIG. 1). The automobile according to the present embodiment is of a so-called FF type, and the engine E thereof is of a so-called "horizontal installation" type, as is well understood from the above-mentioned drawings, and the cylinder row extends substantially along the vehicle width direction. Is installed in the engine room 1. A pair of left and right side frames 3 extending in the vehicle front-rear direction is arranged on both sides of the engine room 1 in the vehicle width direction (in FIG. 1, only a front portion thereof is shown by a virtual line).

The intake manifold 20 for introducing intake air into each cylinder of the engine E is basically located at an intake inlet pipe portion 21 connected to an air supply source described later and a downstream side of the intake inlet pipe portion 21. Cylinder head E of engine E
and a plurality of intake outlet pipe portions 22 connected to h. In the present embodiment, since the engine E has four cylinders, four intake / outlet pipe portions 22 are also provided. still,
More preferably, the intake inlet pipe 21 is also the intake outlet pipe 22.
Similarly, a plurality (4) are provided, and each intake outlet pipe 22 corresponds to each intake inlet pipe 21 and each cylinder of the engine E. Instead of this, the intake inlet pipe may be formed of a single duct having a large passage area, and may be configured to branch into a plurality of intake outlet pipes on the downstream side thereof.

Further, in the vehicle according to the present embodiment, air is supplied to the cylinder from the vehicle front side in order to activate the catalyst of the exhaust gas purifying device (not shown) of the engine E earlier. Discharge to the rear, so-called front intake /
An intake / exhaust system with rear exhaust is adopted. And
The intake manifold 20 is assembled such that at least the main part of the intake outlet pipe portion 22 is located in front of the cylinder head Eh and is connected to the upper portion of the cylinder head Eh from the front upper side.

When the horizontal type engine E is mounted in the engine room 1, as can be seen from FIGS. 4 and 5, the cylinder head Eh fixed to the upper side of the cylinder block Eb constituting the lower part of the engine ( In other words, the axial centerline Lc of each cylinder is not arranged so as to be oriented straight up and down, but the axial centerline Lc of each cylinder extends obliquely upward from the front lower side to the upper rear of the engine E. Is inclined by a predetermined angle β with respect to the vertical direction Lv so that the vehicle faces the vehicle rear side.

By arranging the engine E in such an inclined posture, the upper front side of the engine E and the engine E are
To the rear side of the lower part of the space, the space portions Sf, Sr having a substantially triangular shape in a side view.
Since peripheral devices such as engine accessories can be arranged in the space portions Sf and Sr, it is possible to contribute to improvement in layout of these peripheral devices.

Particularly, by adopting the front intake / rear exhaust intake / exhaust system as described above, at least the main part of the intake outlet pipe portion 22 of the intake manifold 20 is located in front of the cylinder head Eh. Cylinder head Eh
In the case of being connected to the upper part of the engine from above in the front, it becomes easy to dispose at least the main part of the intake outlet pipe part 22 of the intake manifold 20 in the space part Sf on the front side of the upper part of the engine E, and layout is improved. It can be increased.

Further, since the engine E is arranged in the inclined posture as described above, the fuel supply pipe Fp for supplying the fuel into each cylinder is provided with the engine in order to ensure a good layout. The cylinder head Eh forming the upper part of E is arranged so as to extend substantially parallel to the cylinder row on the vehicle front side.

The fuel supply pipe Fp is fixed to the cylinder head Eh via a bracket. More preferably, the strength of the fixed portion itself is the fuel supply pipe Fp.
It is set lower than the intensity of p. By setting in this way, when the vehicle collides, particularly when the vehicle collides with a vehicle whose vehicle height is considerably higher than the vehicle (for example, a large truck), the fuel supply pipe Fp is collided from the upper front side. When a load is applied, the fixed part of the fuel supply pipe Fp is damaged first, or the connection between the pipe Fp and the cylinder head Eh side is released, so that the fuel supply pipe Fp itself is released. Can be protected.

As a method of setting the strength of the fixed portion of the fuel supply pipe Fp to be lower than the strength of the fuel supply pipe Fp itself, the wall thickness of the bracket mounting portion of the cylinder head Eh is set thin or a fragile portion is provided. Various known methods can be applied, such as setting the strength of the mounting bolt material low, or setting the wall thickness of the bracket itself thin or providing a fragile portion.

In the present embodiment, at least the main part of the intake outlet pipe section 22 is used in front of the cylinder head Eh to utilize the intake manifold 20 as described above when the vehicle collides head-on. The impact load applied to the fuel supply pipe Fp laid out on the front side of the engine E is reduced to protect it.

6 and 7 show the intake manifold 2 described above.
It is a side explanatory view and a plane explanatory view showing a schematic shape of an air intake device including zero. A front view of the intake manifold 20 and the intake device is clearly shown in FIG. As shown in these figures, and as described above, the intake manifold 20 includes the intake inlet pipe section 2 connected to the air supply source.
1 and the engine E located on the downstream side of the intake inlet pipe portion 21.
And a plurality of (four) intake / outlet pipe portions 22 connected to the cylinder head Eh. The intake inlet pipe portion 21 and the intake outlet pipe portion 22 are both obtained by molding a predetermined synthetic resin as a material, for example, by an injection molding method.

The air supply source includes a surge tank 19 (see FIG. 1) having a fixed volume, and the intake throttle valve 11 is provided upstream of the surge tank 19.
(See FIGS. 2 and 3) is provided, and an air duct and an air cleaner (both not shown) for guiding fresh air (fresh air) outside the vehicle are provided further upstream of the intake throttle valve 11.
It is configured by connecting.

The surge tank 19 and the intake throttle valve 11 are connected via an intake introducing pipe 17, and the intake throttle valve 11 (specifically, its main body) is provided at the downstream end of the intake introducing pipe 17. Throttle flange 18
Is attached to. The surge tank 19 and the intake introduction pipe 17 are located on the back side (the back side in the plane of the drawing) of the throttle flange 18 in FIG. In addition, the intake manifold 20 or a part thereof (specifically, the intake inlet pipe portion 21) and the surge tank 19, and further, the intake introduction pipe 17 and / or the throttle flange 1 are provided.
It is also possible to integrally mold the resin including 8 together.

On the other hand, the alternator 13 is located on the other side of the intake manifold 20 in the vehicle width direction. Therefore, the intake manifold 20 has heavy objects (the alternator 13 and the main body of the intake throttle valve 11) located on both sides in the vehicle width direction, and is located above the intake manifold 20 (and thus above the rear side thereof) during a vehicle collision. It becomes possible to achieve more effective protection (of the fuel supply pipe Fp).

In the assembled state of the intake inlet pipe portion 21 to the engine E, the upstream side end portion thereof is the surge tank 1
9 and is formed as a bent pipe along a predetermined bent shape so as to wrap around toward the front side below the surge tank 19. On the other hand, each of the intake / outlet pipe parts 22 includes three pipe parts 23 to 25, which are first to third pipe parts.

The first pipe portion 23 communicates with the intake inlet pipe portion 21 on the upstream side, and in the state of being assembled to the engine E, substantially (that is, most of it extends) in the vertical direction and the engine The front end wall of room 1 (in other words,
It will occupy a position facing the radiator 2). That is, when the collision load is input to the intake manifold 20 during a vehicle frontal collision, the collision load is received by the widest surface of the intake manifold 20.

More preferably, the first pipe portion 23 is set so that its front portion has lower rigidity than its rear portion. Specifically, for example, the front side portion of the first pipe portion 23 is formed thinner than the rear side portion. As a result, the first pipe portion 23 is more likely to crash in the front portion than in the rear portion, and the shock absorption characteristics are improved. Therefore, at the time of a vehicle frontal collision, the impact load can be more effectively absorbed by using the intake manifold. Various known methods can be used as a method of setting the rigidity of the front portion of the first pipe portion 23 to be lower than the rigidity of the rear portion. For example, the front portion and the rear portion may be made of different materials so that the front portion has a lower rigidity than the rear portion.

The second pipe portion 24 is located on the downstream side of the first pipe portion 23, and substantially extends in the vehicle longitudinal direction when assembled to the engine E. The second pipe portion 24 is also preferably set so that its front side portion has lower rigidity than its rear side portion. Specifically, for example, the second pipe portion 24 is formed so that the wall thickness thereof becomes thinner as the rear side portion approaches the front side portion.

As a result, the second pipe portion 24 is more likely to crash in the front portion than in the rear portion, and its shock absorbing characteristics are improved. Therefore, at the time of a vehicle frontal collision, the impact load can be more effectively absorbed by using the intake manifold 20. In addition, this second pipe portion 2
Needless to say, various known methods can be used as a method of setting the rigidity of the front side portion of No. 4 to be lower than the rigidity of the rear side portion.

The third pipe portion 25 is located further downstream of the second pipe portion 24, and when assembled to the engine E, extends substantially rearward and downward. ing. The third pipe portion 25 is set to have higher rigidity than the first pipe portion 23 or the second pipe portion 24. Specifically, for example, the third pipe portion 25 is formed to have a wall thickness larger than the first pipe portion 23 and the second pipe portion 24 by a predetermined amount or more.

Thus, in the case of a vehicle frontal collision, the impact load is effectively absorbed by utilizing the intake manifold 20 (in particular, by the first pipe portion 23 and / or the second pipe portion 24), and then the third load is applied. It is possible to effectively protect the fuel supply pipe Fp laid out on the vehicle rear side with respect to at least a part of the pipe portion 25. Regarding the method of setting the rigidity of the third pipe portion 25 to be higher than the rigidity of the first pipe portion 23 or the second pipe portion 24, various known methods such as using different materials may be used. Needless to say, can be used.

The rear end of each of the third pipe portions 25 is joined to or integrally formed with the flange 26, and is joined to the cylinder head Eh via the flange 26. In addition, the entire intake / outlet pipe portion 22 (that is, the first pipe portion 23, the second pipe portion 24, and the third pipe portion 25
It is also possible to integrally mold the resin including the flange 26.

In the present embodiment, when connecting the third pipe portions 25 to the cylinder head Eh, the fuel supply pipe Fp laid out on the front side of the cylinder head Eh.
The third pipe portion 25 is configured to be connected to a lower portion thereof, and at least a part of each third pipe portion 25 on the front side of the connecting portion is located on the vehicle front side of the fuel supply pipe Fp.

By connecting the third pipe portions 25 to the cylinder head Eh in this manner, the fuel supply pipe Fp
Is the third of the intake outlet pipe portion 22 of the intake manifold 20.
Since it is located on the vehicle rear side with respect to at least a part of the pipe portion 25, when the vehicle collides head-on, this third
The first pipe portion 23 located on the vehicle front side with respect to the pipe portion 25.
The second pipe portion 24 and the second pipe portion 24 absorb the impact load at the time of a collision, and the third pipe portion 25 is provided behind the fuel supply pipe Fp.
Can be protected. That is, the cylinder head E
Utilizing the intake manifold 20 located in front of h,
The fuel supply pipe Fp can be more effectively protected in the case of a frontal collision of the vehicle.

In this case, the pair of left and right side frames 3 arranged on both sides of the engine room 1 in the vehicle width direction and extending in the vehicle front-rear direction, as shown in FIG.
The front end portion thereof is located in front of each of the intake / outlet pipe portions 22. Therefore, when the vehicle collides head-on, the radiator 2 at the front end of the engine room and the side frame 3 collide before each intake outlet pipe section 22 to absorb the impact load, and the input load to the intake manifold 20 is reduced. It is being reduced accordingly.

Further, as shown in FIG. 1, more preferably, the center (center line Lm) in the vertical direction of the first pipe portion 23 of each intake / outlet pipe portion 22 corresponds to the front end wall portion of the engine room 1. The positional relationship between the radiators 2 in the vertical direction is set so that the radiator 2 is located above the center (center line Lr) in the vertical direction. Therefore,
When a vehicle collides head-on, the collision load is
3 is input to the lower portion of the intake manifold 20, and the intake manifold 20 crashes so that the lower portion on the front side of the intake manifold 20 is wound toward the rear. Therefore, the fuel supply pipe Fp located on the upper rear side of the intake manifold 20
Therefore, the fuel supply pipe Fp can be protected more effectively without crashing toward the front side.

The present invention is not limited to the above-mentioned embodiments, and within the scope of the invention,
It goes without saying that various improvements and design changes are possible.

[0042]

According to the present invention, when the fuel pipe is laid out on the front side of the cylinder head in a horizontal type engine, intake air is introduced into each cylinder from the front side of the vehicle. An intake air outlet pipe portion of the intake manifold extends substantially vertically and faces a front end wall portion of the engine room, and a first pipe portion downstream of the first pipe portion and substantially in the vehicle longitudinal direction. A second pipe portion that extends and a third pipe portion that is located on the downstream side of the second pipe portion and extends substantially obliquely rearward and downward are provided, and the third pipe portion has a rear end portion. The cylinder head is connected to a portion below the fuel supply pipe, and at least a part of the front side of the connection portion is located on the vehicle front side of the fuel supply pipe. In other words, the fuel supply pipe is located on the vehicle rear side with respect to at least a part of the third pipe portion of the intake outlet pipe portion of the intake manifold. Therefore, when the vehicle collides head-on, the first pipe portion and the second pipe portion, which are located on the vehicle front side of the third pipe portion, absorb the impact load at the time of the collision and the third pipe portion. The part can protect the fuel supply pipe. That is, by utilizing the intake manifold located in front of the cylinder head, it is possible to more effectively protect the fuel supply pipe during a frontal collision of the vehicle.

In this case, preferably, the first pipe portion of each intake outlet pipe portion is set so that its front side portion has lower rigidity than the rear side portion, so that the first pipe portion The front side portion is more likely to crash than the side portion, and the shock absorbing characteristics are improved. This allows
At the time of a vehicle frontal collision, the impact load can be more effectively absorbed by using the intake manifold.

More preferably, the second pipe portion of each intake / outlet pipe portion is set so that its front portion has lower rigidity than the rear portion thereof, so that the second pipe portion is rear Crashes more easily in the front part than in the part, and its shock absorption characteristics are improved. As a result, at the time of a vehicle frontal collision, the impact load can be more effectively absorbed by using the intake manifold.

In the above case, more preferably, the third pipe portion of each intake / outlet pipe portion is set to have higher rigidity than that of the first pipe portion or the second pipe portion so that the vehicle front At the time of a collision, the impact load can be effectively absorbed by using the intake manifold, and the fuel supply pipe laid out on the vehicle rear side with respect to at least a part of the third pipe portion can be effectively protected.

In the above case, more preferably, the center of each intake outlet pipe section in the vertical direction of the first pipe section is located above the center of the front end portion of the engine room in the vertical direction. As a result, when the vehicle collides head-on, the collision load is input to the relatively lower portion of the first pipe portion, and the intake manifold crashes so that the relatively lower portion on the front side is caught backward. To do. Therefore, the fuel supply pipe located on the upper rear side of the intake manifold does not crash and the fuel supply pipe can be protected more effectively.

Further, in the above case, more preferably, the intake manifold is provided by disposing the alternator on one side of the intake manifold in the vehicle width direction and the main body of the intake throttle valve on the other side. Since the heavy objects (the alternator and the main body of the intake throttle valve) are located on both sides of it, it becomes possible to protect the intake manifold (and thus the fuel supply pipe located on the upper rear side) in the event of a vehicle collision.

Furthermore, in the above case, more preferably, on both sides in the vehicle width direction of the engine room,
Side frames that extend in the vehicle front-rear direction are provided, and the front end portions of these side frames are located in front of the intake outlet pipe portions, so that when the vehicle collides head-on, the intake outlet pipes are The front end of the engine room and the side frame collide with each other in front of the above portion to absorb the impact load. Therefore, the input load to the intake manifold can be reduced accordingly.

Further, in the above case, more preferably, the engine is arranged so that the axial center line of each cylinder extends obliquely downward from the front to obliquely upward, so that the engine is viewed from the side. Spaces are formed on the front side and the rear side of the upper part of the engine, and peripheral devices such as engine accessories can be easily laid out in these spaces, which contributes to improvement of layout. In particular, by adopting the intake / exhaust method of front intake / rear exhaust, at least the main part of the intake outlet pipe part of the intake manifold is located in front of the cylinder head and is connected to the upper part of the cylinder head from the front upper side. When it is inserted, it becomes easy to dispose at least the main part of the intake outlet pipe part of the intake manifold in the space part on the front side of the engine upper part, and the layout property can be improved.

[Brief description of drawings]

FIG. 1 is a side view schematically showing the inside of an engine room of an automobile equipped with an engine in which an intake device including an intake manifold according to an embodiment of the present invention is mounted.

FIG. 2 is a front explanatory view of the engine and its intake device.

FIG. 3 is a plan view of the engine and its intake device.

FIG. 4 is a side view of the engine and its intake device.

FIG. 5 is a side view of the engine and its intake device from the opposite direction to FIG.

FIG. 6 is a side view illustrating a schematic shape of the intake manifold.

FIG. 7 is an explanatory plan view showing a schematic shape of the intake manifold.

[Explanation of symbols]

1 ... Engine room 2 ... radiator (front end of engine room) 3 ... Side frame 11 ... Intake throttle valve 13 ... Alternator 19 ... Surge tank 20 ... Intake manifold 21 ... Intake inlet pipe section 22 ... Intake outlet pipe section 23 ... First pipe section 24 ... Second pipe part 25 ... Third pipe section E ... engine Eh ... Cylinder head Fp ... Fuel supply pipe Lc ... Axial center line of cylinder Lm ... Vertical center line of the first pipe section Lr ... Vertical center line at the front end of the engine room

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hiroshi Takahashi             3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda             Within the corporation (72) Inventor Fumihiko Nomura             3-1, Shinchi, Fuchu-cho, Aki-gun, Hiroshima Prefecture Mazda             Within the corporation (72) Inventor Toshio Hayashi             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Masao Ino             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Takashi Chatani             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO (72) Inventor Tetsuji Yamanaka             1-1, Showa-cho, Kariya city, Aichi stock market             Inside the company DENSO

Claims (8)

[Claims] 1. A fuel supply pipe for laterally arranging a cylinder row in an engine room of a vehicle so as to extend substantially in the vehicle width direction, and for supplying fuel into each cylinder on the vehicle front side of a cylinder head. Is an intake manifold configured to introduce intake air into each of the cylinders from the front side of the vehicle with respect to an engine in which the cylinders are arranged substantially parallel to each other, and an intake inlet pipe connected to an air supply source. And a plurality of intake outlet pipe portions located downstream of the intake inlet pipe portion and connected to the cylinder head of the engine, the plurality of intake outlet pipe portions having an upstream side of the intake inlet pipe portion. A first pipe portion that communicates with each other and extends substantially in the vertical direction to face the front end portion of the engine room, and a second pipe portion that is located downstream of the first pipe portion and extends substantially in the vehicle front-rear direction.
And a third pipe portion that is located on the downstream side of the second pipe portion and extends substantially rearward and obliquely downward, the rear end portion of the third pipe portion being the cylinder. An intake manifold connected to a lower portion of the head than the fuel supply pipe, and at least a part of a front side of the connection portion is located on a vehicle front side of the fuel supply pipe. 2. The first pipe portion of each intake outlet pipe portion,
The intake manifold according to claim 1, wherein the front side portion is set to have lower rigidity than the rear side portion. 3. The second pipe portion of each intake outlet pipe portion,
The intake manifold according to claim 2, wherein the front portion is set to have lower rigidity than the rear portion. 4. The third pipe portion of each intake outlet pipe portion,
The rigidity is set to be higher than that of the first pipe portion or the second pipe portion.
The intake manifold according to any one of 1. 5. The vertical center of the first pipe portion of each of the intake / outlet pipe portions is located above the vertical center of the front end portion of the engine room. The intake manifold according to any one of claims 1 to 4. 6. An alternator is arranged on one side of the intake manifold in the vehicle width direction, and a main body of the intake throttle valve is arranged on the other side of the intake manifold. The intake manifold according to any one of 1. 7. A pair of left and right side frames extending in the vehicle front-rear direction are arranged on both sides of the engine room in the vehicle width direction, and front ends of the side frames are located in front of the intake air outlet pipe portions. The intake manifold according to any one of claims 1 to 6, which is located. 8. The engine according to claim 1, wherein the engine is arranged so that an axial centerline of each cylinder extends obliquely downward from the front to obliquely upward. The intake manifold described in.