JP2000145560A - Intake device for transversely installed multicylinder internal combustion engine for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of intake devices for transversely installed multicylinder internal combustion engines for vehicles, improve their rigidity and intake characteristic, and prevent drops in engine output resulting from shielding against engine-room hot air. SOLUTION: An intake device 10 for use in transversely installed multicylinder internal combustion engines for vehicles uses an intake manifold 11 set on the vehicle rear side of an engine body 1. The intake manifold 11 includes a plurality of independent intake passages 13 of the same length and an intake collecting chamber 15. The independent intake passages 13 each extend from the engine body 1 in a generally orthogonal direction and curve up before connecting to the intake collecting chamber 15. The intake collecting chamber 15 set along the cylinders is mounted with a throttle body at its upstream end and with a resonance chamber 19. The resonance chamber 19 is integrated with the intake manifold 11 to overhang the intake collecting chamber 15 and at least part of the independent intake passages 13 as well as to open via a connecting path 21 into the intake collecting chamber 15 from above and just downstream of the throttle body.

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 horizontal multi-cylinder internal combustion engine for a vehicle, and more particularly to a compact intake system having a plurality of independent intake passages of equal length and having a resonance chamber. The present invention relates to an intake device for a horizontally mounted multi-cylinder internal combustion engine for a vehicle, for example, for improving intake characteristics and preventing a decrease in engine output due to shielding of the intake system from hot air in an engine room.

[0002]

2. Description of the Related Art In general, in a multi-cylinder internal combustion engine for a vehicle or the like, the inertial supercharging effect of intake air or resonance (pulsation) supercharging is changed by changing the length and volume of an intake pipe according to the rotation speed of the internal combustion engine. By combining and utilizing the effects, high volume efficiency is maintained over a wide rotation speed range from a low rotation speed range to a high rotation speed range.

[0003] In a multi-cylinder internal combustion engine, in order to improve the resonance supercharging effect of intake air, particularly in a low rotation speed region, a resonance container is provided in an intake passage, for example, as disclosed in There is one described in JP-A-7-91263.

In this device, an intake device for a multi-cylinder internal combustion engine arranged vertically in a vehicle has a plurality of independent intake passages of equal length. Each of the plurality of independent intake passages has a downstream end connected to each cylinder, and an upstream end connected to the intake collecting chamber.

[0005] The upstream end side of each independent intake passage is disposed along one of the left and right sides as viewed from the cylinder arrangement direction of the internal combustion engine (the longitudinal direction of the vehicle) along the cylinder arrangement direction of the internal combustion engine. The portion is formed with a curved portion for changing the passage direction of each independent intake passage so that the downstream end extends from the outside of the internal combustion engine toward the internal combustion engine.

In each of the independent intake passages, the center connecting line connecting the passage center positions in the curved portion is arranged such that the central portion of the independent intake passage extends from the internal combustion engine with respect to a line extending in the cylinder arrangement direction of the internal combustion engine. The resonance container is arranged so as to be inclined as a remote outer side, and communicates with a collection portion of each independent intake passage on the outer side of the curved portion, and has a shape along the center connection line. Are arranged.

The intake pipes forming the independent intake passages are divided in the direction of the passage at the curved portion, and the intake pipe portions on both sides of the divided portion have flanges for connecting the two intake pipe portions. Is provided on this flange,
The resonance container is connected and fixed.

In addition, an intake device for a multi-cylinder internal combustion engine disposed horizontally on a vehicle includes a surge tank (a collection of a plurality of independent intake passages) and a plurality of curved surge tanks communicating with the respective cylinders. As an independent intake passage, a resonance chamber provided between the surge tank and the plurality of independent intake passages inside the curved portion, and a communication passage communicating the surge tank and the resonance chamber, for example, There is one described in JP-A-2-199266.

The communication passage is formed so as to meander along the side surfaces of the plurality of independent intake passages.
The communication opening facing the surge tank on one end side is formed on the bottom surface near the end face of the surge tank opposite to the end face on which the throttle body is mounted.

[0010] Further, the intake device of the multi-cylinder internal combustion engine includes:
Each of the plurality of independent intake passages, the resonance chamber and the communication passage
It is divided into an upper half and a lower half by a common dividing surface to be divided, and these two divided bodies are integrally connected.

[0011]

However, the conventional intake devices of a multi-cylinder internal combustion engine described in these publications have the following problems. First, in the intake device of the conventional multi-cylinder internal combustion engine described in the former publication, the resonance container is disposed along the independent intake passage on the side of the intake manifold. It looked like it was protruding in the direction perpendicular to the direction, and the compactness of the intake device was impaired.

Further, since the resonance container is disposed along the independent intake passage on the side of the intake manifold as described above, a tube or the like is required to connect the resonance container to a collection of the independent intake passages. Therefore, the number of parts increases, and an assembling operation is required.

In addition, since the length of the connecting pipe connecting the resonance container to the gathering portion of the independent intake passages is increased, the intake characteristics can be improved by utilizing the inertia supercharging effect in a low rotational speed range. However, in the middle and high rotation speed regions, when the intake characteristics are to be improved by utilizing the resonance supercharging effect, there is a limit in forming the connection pipe diameter to be large, and this cannot be sufficiently achieved.

Here, if the connection pipe diameter is simply made as large as possible, the resonance chamber itself may also serve as the volume of the gathering portion of the independent intake passages. There is a possibility that the resonance supercharging effect using the above cannot be expected.

Further, since the plurality of independent intake passages and the gathering portion are arranged at positions where the hot air after passing through the radiator from the front of the engine room and the hot air from the upper portion of the engine room are received, the output of the internal combustion engine is reduced. There is a possibility that the temperature may be lowered or the startability may be deteriorated.

On the other hand, the conventional intake device for a multi-cylinder internal combustion engine described in the latter publication is constructed as described above, so that it can be made compact, the number of parts, assembly workability, and medium / high. Although some improvements can be achieved in the intake characteristics and the like in the rotational speed range, there are still the following problems.

First, since the communication opening facing the surge tank at one end of the communication passage is formed on the bottom surface near the end surface of the surge tank opposite to the end surface on which the throttle body is mounted, the resonance chamber and the surge tank are connected. The intake pressure wave inverted at the intake collecting section including the intake air flow is opposed to the flow of the intake air flowing through the throttle body, and is directly affected by the intake pressure wave, and the intake pressure wave is generated by the surge tank and the independent intake air. It is damped in the passage and its influence cannot be smoothly exerted on other cylinders. As a result, there is a possibility that the resonance supercharging effect of the intake air cannot be sufficiently exhibited.

The majority of the plurality of independent intake passages and the surge tank, which is an aggregate thereof, are arranged at positions where they receive hot air after passing through the radiator from the front of the engine room and hot air from the upper part of the engine room. Therefore, there is still a possibility that the output of the internal combustion engine is reduced, the startability is deteriorated, and the like.

The present invention solves the above-mentioned problems of the conventional intake device for a multi-cylinder internal combustion engine for a vehicle, has a plurality of independent intake passages of equal length, and is provided with a resonance container. Vehicles that make it possible to reduce the size of the intake system, especially to improve the intake characteristics (volume efficiency or filling efficiency) in the medium and high rotational speed ranges, and to prevent the engine output from decreasing due to shielding of the intake system from hot air in the engine room. It is an object of the present invention to provide an intake device for a horizontal multi-cylinder internal combustion engine.

[0020]

SUMMARY OF THE INVENTION The present invention relates to an intake system for a horizontally mounted multi-cylinder internal combustion engine for a vehicle which solves the above-mentioned problems. A cylinder internal combustion engine is mounted laterally in front of the vehicle, and an intake manifold is disposed on the vehicle rear side of the internal combustion engine main body.The intake manifold has a plurality of equal length independent intake passages and an intake collecting chamber. Having a plurality of independent intake passages, each of which extends from the internal combustion engine main body in a substantially orthogonal direction, and is then curved slightly upward and connected to the intake collective chamber. A horizontally arranged multi-cylinder for a vehicle, which is disposed along the cylinder arrangement direction of the internal combustion engine, has a throttle body mounted on an upstream end thereof, and has a resonance chamber attached thereto so as to communicate with the intake collecting chamber. In an intake device of an internal combustion engine, The resonance chamber is formed integrally with the intake manifold so as to cover at least a part of each of the plurality of independent intake passages and an upper part of the intake collecting chamber, and is formed above the intake collecting chamber. At a position directly below the downstream side of the throttle body, the opening communication is provided via a connection path, and the intake manifold and the resonance chamber are
A lower half integrally formed with the plurality of independent intake passages, a lower half of the intake collecting chamber, and a lower half of the resonance chamber; an upper half of the intake collecting chamber and an upper half of the resonance chamber; And an upper half body integrally formed with the upper half body, and the connection path is formed integrally with the upper half body. .

According to the first aspect of the present invention, the resonance chamber covers at least a part of each of the plurality of independent intake passages and an upper part of the intake collecting chamber. And is formed integrally with the intake manifold. In addition, the intake collecting chamber is disposed along the cylinder arrangement direction of the internal combustion engine.

As a result, the resonance chamber does not protrude in a direction orthogonal to the cylinder arrangement direction of the internal combustion engine, and covers at least a part (upstream side) of each of the plurality of independent intake passages. Since the resonance chamber is formed, the resonance chamber can be made compact by effectively utilizing the space between the internal combustion engine main body and the intake air collection chamber.
The entire intake device including the resonance chamber can be made compact.

The required volume of the resonance chamber can be reduced by appropriately selecting the amount of extension above at least a part of each of the plurality of independent intake passages and above the intake collecting chamber, while making the resonance chamber compact. Can be easily obtained by integral molding with the intake manifold.

Further, at least a part of each of the plurality of independent intake passages and the intake collecting chamber are heated by the intake layer in the resonance chamber covering the upper part of the independent intake passage and the hot air after passing through the radiator from the front of the engine room and the upper part of the engine room. Since it is shielded from the hot air from the parts, it is possible to suppress a rise in the temperature of the intake air flowing through the inside thereof, thereby preventing a decrease in volumetric efficiency. As a result, it is possible to prevent a decrease in the output of the internal combustion engine and a deterioration in the startability.

Further, the resonance chamber is located above the intake air collecting chamber.
At a position immediately below the downstream side of the throttle body, it is in open communication via a connection path, and the throttle body is mounted on the upstream end of the intake collecting chamber.

As a result, the inverted intake pressure wave in the intake collecting section including the resonance chamber and the intake collecting chamber is prevented from facing the flow of the intake air flowing through the throttle body, and is directly affected by the flow. Disappears. As a result, the intake pressure wave is minimized in the intake collecting chamber and the independent intake passage, and can smoothly affect the other cylinders. The volumetric efficiency of the intake air can be improved by improving the resonance supercharging effect of the intake air.

The intake manifold and the resonance chamber are formed of a lower half in which a plurality of independent intake passages, a lower half of the intake collection chamber and a lower half of the resonance chamber are integrally formed, and an upper half of the intake collection chamber. The upper half of the resonance chamber and the upper half of the resonance chamber are united with each other, and the connecting passage for opening the resonance chamber above the intake air collecting chamber is integrated with the upper half. It is formed.

As a result, the intake manifold, the resonance chamber, and the connection path are formed simultaneously by combining the lower half and the upper half obtained by integral molding by casting, so that the manufacture and the structure are simplified. Therefore, cost can be reduced.

Further, since the intake manifold, the resonance chamber, and the connection path are formed as described above, the rigidity of the intake manifold and the resonance chamber itself can be improved, so that the vibration of the intake manifold is reduced. Long-term reliability of the intake control parts and the like can be ensured.

Further, the size of the connection path (projection length and diameter dimension to the resonance chamber) and the volume of the resonance chamber are adjusted so that the maximum resonance supercharging effect can be obtained by adapting to the rotation speed of the internal combustion engine.
Because it can be set appropriately, especially in the middle and
The resonance supercharging effect of the intake air in the high rotation speed region can be easily improved, and from this aspect also, the volumetric efficiency of the intake air can be improved.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the invention described in claim 1 of the present application shown in FIGS. 1 to 3 will be described below. FIG. 1 is a schematic side view showing a state in which a vehicle-mounted horizontal multi-cylinder internal combustion engine to which an intake device according to the present embodiment is applied is mounted on a vehicle. FIG. 2 is a view of the vehicle shown in FIG. Schematic plan view of the internal combustion engine part, FIG.
FIG. 2 is an exploded view of an intake manifold and a resonance container in the intake device of FIG. 1.

Referring to FIGS. 1 and 2, a vehicle-mounted horizontal multi-cylinder internal combustion engine 0 to which the intake device 10 according to the present embodiment is applied is an in-line four-cylinder internal combustion engine, and is mounted horizontally at the front of the vehicle body. An internal combustion engine main body 1 which is mounted and includes a cylinder block 4, a cylinder head 2, a cylinder head cover 3, and an oil pan 5 below the cylinder block 4;
Intake device disposed on the vehicle rear side of the internal combustion engine body 1
10 and a cylinder block 4 from one side of the cylinder head 2 along the cylinder arrangement direction in front of the internal combustion engine main body 1.
And an exhaust manifold 6 disposed on one side of the exhaust manifold 6. Further, a radiator 8 is provided in front of the exhaust manifold 6.
And a capacitor 9.

The intake device 10 includes an intake manifold 11 disposed on the other side of the cylinder head 2 along the cylinder arrangement direction.
And a resonance container 18 described later. 7 is an alternator driven by a crankshaft (not shown) via a belt transmission mechanism, and 30 is a bonnet.

The intake manifold 11 is made of metal or resin and has four equal length independent intake passages corresponding to the number of cylinders.
Four independent intake pipes 12, 13, ... forming 13, 13, ...
Each of these four independent intake pipes 12, 12 ... extends from the other side of the cylinder head 2 of the internal combustion engine main body 1 slightly downward, then slightly upward, and generally in a substantially orthogonal direction. After being installed, it is connected to the intake manifold 14 forming the intake manifold 15.

The intake manifold 14 is formed of a substantially cylindrical pipe, and its axial direction is arranged along the direction in which the cylinders of the internal combustion engine main body 1 are arranged. Body 16 is mounted. The further upstream side of the throttle body 16 is connected to an air cleaner (not shown) via a common intake pipe 17.

The intake air that has flowed through the throttle body 16 is once collected in the intake collecting chamber 15 and then diverted to each of the four independent intake passages 13, 13,. It is supplied to each cylinder of the section 1.

The suction device 10 is provided with a resonance container 18 defining a resonance chamber 19 communicating with the suction collecting chamber 15. The resonance container 18 is made of metal or resin, has a substantially rectangular shape in a plan view, and has a portion (a right upstream majority portion in FIG. 1) of each of the four independent intake passages 13, 13,. It is formed integrally with the intake manifold 11 so as to cover the upper part and the upper part of the intake collecting chamber 15.

As shown in FIG. 1, the resonance container 18 has a substantially S-shaped bottom wall 18e at a cutting position including the center line of each independent intake passage 13 and a short rear side of the vehicle. It has a curved shape surrounded by a vertical wall 18f, a long vertical wall 18b on the front side of the vehicle, and a top wall 18a which is bent outward in a U-shape.

The bottom wall 18e of the resonance container 18 is
From the upwardly curved top wall of the right upstream majority of
The arc-shaped wall 14a of the upper half of the intake collecting chamber 15 described later (FIG. 3
It is linked to a reference.

The top wall 18a of the resonance container 18 is bent slightly outward at a substantially central portion so that the front side of the vehicle is slightly inclined forward, and has a U-shape. The hot air after passing through the radiator 8 and the condenser 9 flows along the outer surface (top surface) of the top wall of the cylinder head cover 3 from the front of the engine room, and then the top wall It flows smoothly along the outer surface (top surface) of 18a.

In the space A, fuel control parts such as four fuel injection valves 22, a fuel supply pipe (delivery pipe) 23, a pressure regulating valve 24, etc., corresponding to the number of cylinders of the internal combustion engine 0 are arranged. Hot air from the front of the engine room, as described above,
Since the gas smoothly flows down along the top surface of the cylinder head cover 3 and the top surface of the resonance vessel 18, these components can be shielded from the hot air, and the fuel can be smoothly supplied to each cylinder. Thus, a decrease in the output of the internal combustion engine and a deterioration in startability are prevented.

The resonance chamber 19 forming the internal space of the resonance container 18
Above the intake air collecting chamber 15, an opening communication is provided via a connection path 21 at a position just below the downstream side of the throttle body 16. In FIG. 2, the suction position corresponds to a position close to a corner formed by a right side 18c and a rear side 18d of the resonance container 18 in a substantially rectangular vehicle traveling direction in a plan view. It corresponds to the top wall portion near the end of the collecting pipe 14. The connection path 21 is formed in the top wall portion near the end of the intake manifold 14 as an internal passage of the connection cylinder 20 that is integrally formed through the top wall.

As shown in FIGS. 1 and 3, the intake manifold 11 and the resonance chamber 19 (resonance container 18) formed as described above are positioned at the position of the dividing plane B in FIG. The lower half 25 is formed integrally with the independent intake passages 13, 13,..., The lower half of the intake collecting chamber 15 and the lower half of the resonance chamber 19, and the upper half of the intake collecting chamber 15 and the resonance chamber 19 And an upper half 26 integrally formed with the upper half. The two halves are formed integrally by casting and then united.

As shown in FIG. 3, the upper half 26 is integrally provided with a connecting cylinder 20 penetrating the top of a wall forming the upper half of the intake collecting chamber 15. I have. The top of the wall forming the upper half of the intake manifold 15 exactly corresponds to the top wall of the intake manifold 14 described above. Although not shown in detail, the above-described throttle body 16 is mounted on an upstream end wall portion of a wall forming the upper half of the intake collecting chamber 15.

The wall forming the upper half of the intake collecting chamber 15 is
As shown in FIG. 3, it is formed by an arc-shaped wall portion 14a and a vertical wall portion 14b, each of which has an approximately 1/4 arc shape in cross section. The connection tube 20 is provided integrally with the arc-shaped wall portion 14a. The vertical wall portion 14b is continuous with the vertical wall 18f of the resonance container 18.

In the lower half 25, the lower half of the vertical wall 18b surrounding the lower half of the resonance chamber 19 has four independent intake pipes 12,12.
.. Are formed integrally with a portion which is vertically implanted from each of the top wall portions, so that the rigidity of the resonance container 18 is improved.

The resonance chamber 19 of the resonance vessel 18 resonates with an intake pressure wave generated when an intake valve opens and closes in each cylinder of the internal combustion engine 0, and sends out a reverse pressure wave. By appropriately setting the volume of the resonance chamber 19, the length of the connecting cylinder 20 (projection length into the resonance chamber 19), and the diameter, the resonance adapted to the middle and high rotation speed range of the internal combustion engine 0 is achieved. The supercharging effect can be exerted, and the volumetric efficiency of the intake air can be improved. However, the diameter of the connection tube 20 is
Cannot exceed 15 diameters.

In the low rotational speed range of the internal combustion engine 0, the lengths of the independent intake passages 13, 13,... Function effectively to exert an inertia supercharging effect and improve the volumetric efficiency of intake air. be able to.

Since the present embodiment is configured as described above, the following effects can be obtained. The resonance chamber 19 of the resonance vessel 18 covers at least a part of each of the four independent intake passages 13, 13... Like so
It is formed integrally with the intake manifold 11. Moreover, the intake collecting chamber 15 is arranged along the cylinder arrangement direction of the internal combustion engine 0.

As a result, the resonance chamber 19 does not protrude in a direction orthogonal to the direction in which the cylinders of the internal combustion engine 0 are arranged, and furthermore, at least a part of each of the four independent intake passages 13, 13,. Since it is formed so as to cover, the space between the internal combustion engine main body 1 and the intake collecting chamber 15 can be effectively used, and the resonance chamber 19 can be compactly formed. 10 can be made compact as a whole.

The resonance chamber 19 has a compact construction, and has at least part of each of the four independent intake passages 13, 13,... By appropriately selecting the required volume of the resonance chamber 19
Can be easily obtained by integral molding with the intake manifold 11.

Also, at least a part of each of the four independent intake passages 13, 13... And the intake collecting chamber 15 are separated from the front of the engine room by the intake layer in the resonance chamber 19 covering the upper part thereof. Since it is shielded from the hot air after passing through the radiator 8 and the condenser 9 and the hot air from the upper part of the engine room, it is possible to suppress a rise in the temperature of the intake air flowing therethrough and prevent a decrease in volumetric efficiency.

The hot air that has passed through the radiator 8 and the condenser 9 from the front of the engine room flows along the top surface of the cylinder head cover 3, and then flows to the top surface of the resonance container 18 having the front forward inclined surface. The fuel injection valve 2 flows smoothly along the space A and does not get caught in the space A between the internal combustion engine main body 1 and the resonance chamber 19.
2, fuel supply pipe (delivery pipe) 23, pressure regulating valve, etc.
The fuel control component of No. 4 is effectively shielded from this hot air, and can supply fuel to each cylinder smoothly.

As described above, the hot air from the front and upper parts of the engine room can be shut off, the temperature rise of the intake air can be suppressed, and the decrease in volumetric efficiency can be prevented. Further, the supply of fuel to each cylinder can be smoothly performed. By doing so, it is possible to prevent a decrease in output of the internal combustion engine and a deterioration in startability.

Further, the resonance chamber 19 is provided above the intake collecting chamber 15 at a position directly below the throttle body 16 on the downstream side of the connection passage.
The throttle body 16 is attached to the upstream end of the intake collecting chamber 15 through an opening.

As a result, the intake pressure wave inverted in the intake collecting section including the resonance chamber 19 and the intake collecting chamber 15 is prevented from facing the flow of the intake air flowing through the throttle body 16, and its influence is reduced. Will not be directly received. As a result, the intake pressure wave is generated in the intake collective chamber 15 and the independent intake passage 1.
The damping in 3, 13, ... is minimized, and it can smoothly affect other cylinders, improving the resonance supercharging effect of the intake of the internal combustion engine, especially in the middle and high rotation speed ranges. Thus, the volumetric efficiency of the intake air can be improved.

Assuming that the resonance chamber 19 is opened and communicated with the downstream end wall of the intake collecting chamber 15, the resonance chamber 19 and the intake collecting chamber 15
The intake pressure wave inverted in the intake gathering section including the air flow will be opposed to the flow of the intake air flowing through the throttle body 16 and will be directly affected by the flow. Can not.

The intake manifold 11 and the resonance chamber 19 (resonance vessel 18) are connected to the four independent intake passages 13, 13,..., The lower half of the intake air collection chamber 15, and the lower half of the resonance chamber 19. The lower half 25 formed integrally and the upper half 26 integrally formed with the upper half of the intake collecting chamber 15 and the upper half of the resonance chamber 19 are formed by being united. The connection path 21 that opens and communicates above the intake collecting chamber 15 is formed of the upper half body 26 of the intake collecting chamber 15.
Is formed integrally with the top of the wall forming the upper half.

As a result, the intake manifold 11, the resonance chamber 19, and the connection path 21 are simultaneously formed by combining the lower half 25 and the upper half 26 obtained by integral molding by casting. And the structure can be simplified, and the cost can be reduced.

Since the intake manifold 11, the resonance chamber 19, and the connection path 21 are formed as described above, the rigidity of the intake manifold 11 and the resonance container 18 itself can be improved. Vibration is reduced, and long-term reliability of the intake control parts and the like can be ensured.

Further, the volume of the resonance chamber 19, the length of the connecting cylinder 20 (the length of the protrusion into the resonance chamber 19) and the diameter are determined by the internal combustion engine 0
Can be appropriately set so as to obtain the maximum resonance supercharging effect by adapting to the rotational speed of the internal combustion engine 0.
In particular, it is possible to easily improve the resonance supercharging effect of the intake air particularly in the middle and high rotation speed regions, and also from this aspect, it is possible to improve the volumetric efficiency of the intake air (see FIG. 5).

In the present embodiment, the resonance chamber 19 and the intake collecting chamber 15 are directly communicated with each other via the connection path 21 forming the internal passage of the connection cylinder 20. However, the present invention is not limited to this. For example, FIG. As shown in the figure, an intake control valve 28 that can control the connection path 21 to be connected or disconnected from the connection path 21 may be provided.

The opening and closing of the intake control valve 28 is controlled by a diaphragm 29 and a solenoid valve (not shown) according to the rotational speed range of the internal combustion engine 0. Then, in the low rotational speed range (N <N ₁ ) of the internal combustion engine 0, the internal combustion engine 0 is closed, and the intake using the inertial supercharging effect is performed through the independent intake passages 13, 13,. In the region (N> N ₁ ), the air is opened using the resonance supercharging effect through the resonance chamber 19 of the resonance container 18, and high volume efficiency can be obtained as a whole (see FIG. 5). .

That is, in the low rotational speed range (N <N ₁ ) where the intake control valve 41 is closed, the communication between the resonance chamber 33 and the intake collecting chamber 15 is completely cut off, and the independent intake passages 13 and 13 are closed.
In the middle / high rotation speed range (N> N ₁ ) where the intake control valve 41 is opened, the intake collecting section including the resonance chamber 33 is utilized by utilizing the intake characteristics obtained by the inertial supercharging effect by the passage length of. By utilizing the intake characteristic obtained by the resonance supercharging effect by the intake pressure wave inverted by the above, the two intake characteristics (inertial supercharging and resonance supercharging) are efficiently utilized to the maximum, and in the entire rotational speed range. High volume efficiency can be obtained.

As the intake control valve 28, a butterfly type or rotary type open / close valve can be used. Intake control valve 28
The diaphragm 29 and the solenoid valve for controlling the opening and closing of the valve, and further, a negative pressure tank for supplying a negative pressure to the diaphragm 29, etc.
It can be arranged inside the resonance container 18 (resonance chamber 19). As a result, the appearance is not impaired, and the control components related to the intake device 10 can be centralized at one place, so that the assembling workability is also improved. In this case, the negative pressure tank can be formed integrally with the upper half 26 or the lower half 25.

Further, instead of the intake control valve 28, a passage length varying means for making the connection path length extendable and contractible may be provided. In this case, in order to increase the connection path length, the protrusion length into the resonance chamber 19 is increased. It is not preferable to protrude into the intake collecting chamber 15 because the intake air flow in the intake collecting chamber 15 is disturbed.

When such a passage length varying means is provided, in order to improve the volumetric efficiency of the intake air due to the resonance supercharging effect in the middle rotation speed region of the internal combustion engine 0, the connection path length is determined by the Helmholtz equation. It may be increased or the diameter of the connection path may be reduced. The same effect can be obtained even if the volume of the resonance chamber 19 is increased. In order to improve the volumetric efficiency of the intake air due to the resonance supercharging effect in the high rotation speed region of the internal combustion engine 0, the above may be reversed.

In the above embodiment, the resonance container 18
The upper part of each of the four independent intake passages 13, 13... (Right upstream majority in FIG. 1) and the upper part of the intake collecting chamber 15 are covered. Instead, each of the four independent intake passages 13, 13... Has an eave-like portion so as to cover substantially all of the fuel control parts such as the fuel injection valve and the fuel supply pipe. It may be formed.

In this manner, the intake system and the fuel system can be more effectively shielded from the hot air in the front part of the engine room and the upper part of the engine room, so that a decrease in the output of the internal combustion engine and a deterioration in the startability can be better prevented. can do.

The vehicle-mounted horizontal multi-cylinder internal combustion engine 0
Although a four-cylinder internal combustion engine is used, the invention is not limited to this, and another multi-cylinder internal combustion engine such as a six-cylinder internal combustion engine may be used.

[Brief description of the drawings]

FIG. 1 is a schematic side view showing a state in which a vehicle-mounted horizontal multi-cylinder internal combustion engine to which an intake device according to one embodiment of the present invention is applied is mounted on a vehicle.

FIG. 2 is a schematic plan view of an internal combustion engine portion of the vehicle shown in FIG. 1 with a hood removed.

FIG. 3 is an exploded view of an intake manifold and a resonance container in the intake device of FIG. 1;

FIG. 4 is a schematic side view of an intake device according to another embodiment of the invention described in claim 1 of the present application.

5 is a characteristic diagram of a laterally mounted multi-cylinder internal combustion engine for a vehicle to which the intake device of FIG. 4 is applied.

[Explanation of symbols]

0: Horizontally mounted multi-cylinder internal combustion engine for vehicle, 1: Internal combustion engine main body, 2: Cylinder head, 3: Cylinder head cover,
4 ... Cylinder block, 5 ... Oil pan, 6 ... Exhaust manifold, 7 ... Alternator, 8 ... Radiator, 9 ... Condenser, 10 ... Intake device, 11 ... Intake manifold, 12 ... Independent intake pipe, 13 ... Independent intake passage, 14 ... intake manifold (intake chamber wall), 14a ... arc-shaped wall, 14b ... vertical wall, 15 ... intake manifold, 16 ... throttle body, 17 ... common intake pipe, 18 ...
Resonance container, 18a: Top wall, 18b: Vertical wall on the front side of the vehicle, 18c
, 18d ... one side of a substantially rectangular shape in plan view, 18e ... bottom wall, 18f ...
Vertical wall on the rear side of the vehicle, 19: resonance chamber, 20: connection cylinder, 21: connection path, 22: fuel injection valve, 23: fuel supply pipe (delivery pipe), 24: pressure regulating valve, 25: lower half body, 26 … Upper half, 27…
Ribs, 28: intake control valve, 29: diaphragm, 30: bonnet, A: space, B: split surface.

Claims (1)

[Claims] 1. A multi-cylinder internal combustion engine is mounted laterally in front of a vehicle, and an intake manifold is provided on a rear side of the internal combustion engine main body with respect to the vehicle. The intake manifold has a plurality of equal length independent intakes. Each of the plurality of independent intake passages extends in a substantially orthogonal direction from the internal combustion engine main body, is curved upward, and is connected to the intake collective chamber, A vehicle in which an intake air collecting chamber is disposed along the cylinder arrangement direction of the internal combustion engine, a throttle body is mounted at an upstream end thereof, and a resonance chamber is provided so as to communicate with the intake air collecting chamber. In the intake apparatus for a horizontal multi-cylinder internal combustion engine, the resonance chamber covers at least a part of each of the plurality of independent intake passages and an upper part of the intake collecting chamber, and is integrated with the intake manifold. Formed into In addition, above the intake collecting chamber, at a position directly below the throttle body on the downstream side, the opening communicating with the intake manifold via a connection path, the intake manifold and the resonance chamber are connected to the plurality of independent intake passages and the intake collecting chamber. A lower half in which the lower half of the chamber and the lower half of the resonance chamber are integrally formed, and an upper half in which the upper half of the intake collecting chamber and the upper half of the resonance chamber are integrally formed. The connection path is formed integrally with the upper half body, the intake device for a horizontally mounted multi-cylinder internal combustion engine for a vehicle.