JPH1162737A - Intake system of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the intake system of an internal combustion engine which enlarges space for mounting a throttle body part. SOLUTION: An air cleaner 12 for housing an air cleaner 14 for filtering intake air into an internal combustion engine 10 and a surge tank 22 for absorbing an intake pulsation are arranged in parallel in the direction of the row of cylinders of the internal combustion engine 10. An open space 23 is formed between them 12, 22 on both sides of the row of the cylinders and above them and a throttle body 19 in which a throttle valve 20 is built in is arranged in the open space 23, whereby the throttle body 19 can be arranged with sufficient space in the open direction of the space 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake device for an internal combustion engine in which an installation space for a throttle body is enlarged, and more particularly to an intake device in which an intake system component is constituted as an assembly of one unit. It is suitable.

[0002]

2. Description of the Related Art Conventionally, Japanese Patent Application Laid-Open No. Hei 6-81735 discloses an intake device in which this kind of intake system component is configured as an assembly of one unit. By the way, in recent years, for the purpose of improving the distribution of intake air to each cylinder of the internal combustion engine, or improving the tone of intake sound, the throttle body has been arranged at the center of the surge tank. An embodiment in which the throttle body is arranged in this manner is shown.

[0003]

However, in the above conventional apparatus, a throttle body is disposed below an air cleaner case that houses an air cleaner for filtering intake air to an internal combustion engine, and a surge tank is disposed below the throttle body. The configuration is a basic configuration. Therefore, since the throttle body is vertically sandwiched between the air cleaner case and the surge tank, the installation space for the throttle body is significantly restricted in the vertical direction.

In the above-mentioned conventional apparatus, in the embodiment in which the shaft axis direction of the throttle valve housed in the throttle body is orthogonal to the cylinder row direction of the internal combustion engine, the drive mechanism of the throttle valve or the opening of the throttle valve A detection mechanism and the like must be installed between the throttle body and the main body of the internal combustion engine, and it is difficult to secure an installation space for these mechanisms.

In the above-mentioned conventional apparatus, in the embodiment in which the axial direction of the throttle valve housed in the throttle body is arranged in parallel with the direction of the cylinder rows of the internal combustion engine, the intake valve is provided at one end in the axial direction of the throttle valve. Since the manifold pipe is disposed, the presence of the intake manifold pipe hinders the installation space for a throttle valve driving mechanism or a throttle valve opening detection mechanism.

As a result, according to the above-mentioned conventional apparatus, it is not possible to secure a sufficient space for installing the throttle body. In recent years, the electronic control throttle device, which has been increasingly required with the adoption of traction control and the like, has an electric actuator mechanism, which increases the overall physical size. This causes a problem that the device cannot be mounted.

[0007] The present invention has been made in view of the above points,
It is an object of the present invention to provide an intake device for an internal combustion engine in which an installation space for a throttle body is increased.

[0008]

According to the first aspect of the present invention, there is provided an air cleaner case (12) accommodating an air cleaner (14) for filtering intake air to an internal combustion engine (10). A tank (22) is arranged so as to extend in parallel with the cylinder row of the internal combustion engine (10), and is opened between the two (12, 22) on both sides and the upper side in the cylinder row direction of the internal combustion engine (10). Space (23)
In this space (23), a throttle body (1) having a built-in throttle valve (20) for adjusting the amount of intake air is provided.
9) is arranged.

According to this, the throttle body (19)
Is open to both sides and the upper side in the cylinder row direction of the internal combustion engine (10), so that there is sufficient space in the opening direction of the space (23). A throttle body (19) can be arranged. Therefore, even if the throttle valve driving mechanism (34) becomes large like an electronically controlled throttle device, a sufficient installation space can be secured.

According to the third aspect of the present invention, an air cleaner case (12) accommodating an air cleaner (14) for filtering intake air to the internal combustion engine (10) and a surge tank (22) are arranged in a horizontal direction. And a space (23) opened between both sides (12, 22) in the longitudinal direction of the air cleaner case (12) and the surge tank (22) and on the upper side. ), A throttle body (19) incorporating a throttle valve (20) for adjusting the intake air amount is arranged.

In such an arrangement layout, the space (23) in which the throttle body (19) is arranged is open to both sides and the upper side in the longitudinal direction of the air cleaner case (12) and the surge tank (22). The same function and effect as the first aspect of the invention can be exhibited. In addition, the code | symbol in the parenthesis of each said means shows the correspondence with the concrete means of embodiment mentioned later.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an embodiment in which the present invention is applied to an intake device of an internal combustion engine for running a vehicle. The internal combustion engine 10 is of a four-cylinder type in this example, and the cylinder row direction is the same as that of FIG. This is the vertical direction (the horizontal direction in FIGS. 2 and 3). 10a is a cylinder head of the internal combustion engine 10;
0b is an intake port.

Immediately adjacent to the internal combustion engine 10,
An intake device 11 according to the invention is provided. The intake device 11 is composed of a single unit assembly in which various intake system components described later are compactly integrated. In the intake device 11, an air cleaner case 12 is disposed above a portion near the internal combustion engine 10, and an opening 12a (FIG. 1) is provided on an upper surface of the air cleaner case 12 to close the opening 12a. The cap member 13 is detachably attached to the air cleaner case 12. A substantially rectangular support frame 13 a protruding into the air cleaner case 12 is formed integrally with the cap member 13.

The support frame 13a is set to a size capable of accommodating the air cleaner 14 inside thereof, and
A flange 14b on the outer periphery of the air cleaner 14 is sandwiched and fixed between the support frame 13a and the inner wall surface of the air cleaner case 12. The air cleaner case 1
The cap 2 and the cap portion 13 are both made of resin, have a certain degree of elasticity such as nylon, and are molded products of a resin material having excellent strength. The other resin components described below are also air cleaners. Case 12 and cap part 13
It is molded with the same resin as described above.

The air cleaner 14 has, for example, a corrugated filter portion 14a, and the entire filter portion has a rectangular planar shape, and a flange portion 14b projects outward on four sides of the outer periphery of the rectangle. I have. The filtering portion 14a and the flange portion 14b
Are integrally formed from the same filter medium (for example, synthetic fiber nonwoven fabric, filter paper, etc.). An air inlet 15 that protrudes horizontally in the cylinder row direction of the internal combustion engine 10 is integrally formed on one side surface (a portion near the internal combustion engine 10) of the air cleaner case 12. This is for introducing (outside air) into the case 12. Then, the air introduced from the air inlet 15 passes through the corrugated filter portion 14a of the air cleaner 14 as shown by the arrow a in FIG. 1, so that dust and the like in the air are removed by the filter portion 14a, and the air is removed. It is cleaned.

Therefore, in FIG.
Is a dust side space 16 and the right side of the air cleaner 14 is a clean side space 17. A tubular outlet duct 18 is integrally formed at a portion of the air cleaner case 12 located on the clean side space 17 side and at a central portion in the engine cylinder row direction. This outlet duct 18 is provided with a throttle body 1 made of resin.
9 are connected by fitting. Inside the throttle body 19, a throttle valve 20 (FIG. 3) is disposed so as to be rotatable about a shaft 21. As is well known, the throttle valve 20 is operated by an accelerator mechanism of the vehicle to adjust the amount of intake air taken into the internal combustion engine 10. A throttle body 19 is provided downstream of the throttle valve 20 so as to reduce intake pulsation.
Surge tank 22 that expands the volume of the downstream space
Is arranged.

The surge tank 22 is located on the upper side at a portion opposite to the internal combustion engine 10 as shown in FIGS. 2 and 3, and the surge tank 22 is provided on the internal combustion engine 10 as shown in FIG. It extends in the cylinder row direction (the left-right direction in FIG. 3) and is formed over the entire length of the width W in FIG. Here, the layout of the air cleaner case 12, the throttle body 19 and the surge tank 22 will be described in detail.
It is arranged so as to extend in parallel with the cylinder row of the internal combustion engine 10. That is, the longitudinal direction of the air cleaner case 12 and the surge tank 22 is parallel to the cylinder row direction of the internal combustion engine 10, and the air cleaner case 12 and the surge tank 22 are spaced apart from each other by a predetermined distance as shown in FIG. Are arranged side by side.

By arranging the air cleaner case 12 and the surge tank 22 in this way, both
A space 23 is formed between both sides 22 in the cylinder row direction of the internal combustion engine 10 and open on the upper side, and the throttle body 19 is arranged in this space 23. By adopting such an arrangement, the shaft 21 of the throttle valve 20 is arranged so that its axial direction is parallel to the cylinder row of the internal combustion engine 10.

As shown in FIG. 1, a resin-made intake manifold pipe 24a passes from below the surge tank 22 to below the throttle body 19 and the air cleaner case 12 toward the intake port 10b of the internal combustion engine 10.
To 24d are arranged. Here, the internal combustion engine 1 of the present embodiment
Since 0 is a four-cylinder type, there are four intake manifold pipes 24a to 24d, and the inlets (upper ends) of the intake manifold pipes 24a to 24d open to the space in the surge tank 22. ing.

The intake manifold pipes 24a to 24a
d is formed into a curved shape as shown in FIG. 1 and outlet portions (lower end portions) of the intake manifold pipes 24a to 24d.
Is formed integrally with a flange portion 25 serving as a mounting portion with resin. This flange portion 25 has a flat plate shape along the mounting surface 10c of the internal combustion engine 10, and has a mounting surface 10c.
A plurality of bolt-shaped male screw members (not shown) protruding toward the flange portion 25 side are attached to the connector. On the other hand, the flange portion 25 is provided with a plurality of mounting holes 26 through which the male screw member is inserted, and in this example, twelve mounting holes 26 are provided as shown in FIG.
Then, by fastening a nut (not shown) to the male screw member inserted into the mounting hole 26, the flange portion 25 is fastened to the mounting surface 10 c of the internal combustion engine 10, thereby fixing the entire intake device 11 to the internal combustion engine 10. It is supposed to.

In the intake device 11 arranged adjacent to the side of the internal combustion engine 10, the air cleaner case 1
2. The outlet duct 18, the throttle body 19, the surge tank 22, the intake manifold pipes 24a to 24d, the flange 25, and the like are all formed by resin molding, and these parts are integrally formed by joining means such as integral molding or welding. And these intake system components are assembled as a one-unit assembly.

On the other hand, each intake manifold pipe 24a-2
The fuel (gasoline) is placed on the outlet side of 4d (in other words, on the upstream side of the intake port 10b of the internal combustion engine 10).
The fuel injection valve 31 that injects the fuel is disposed on the flange portion 25. That is, mounting holes 32 for the fuel injection valves 31 are formed in the flange portion 25 in correspondence with the four intake manifold pipes 24a to 24d, and the fuel injection valves 31 are inserted into and removed from the mounting holes 32. It is fixed as possible.

As shown in FIG. 1, the fuel injection valve 31 is disposed in the dust-side space 16 in the air cleaner case 12, while a fuel supply pipe (separating pipe) for supplying fuel to the four fuel injection valves 31 is provided. The pipe (piping) 33 is arranged along the direction of the engine cylinder row near the fuel inlet side end (upper end) of each fuel injection valve 31, and connects the branch pipe of the fuel supply pipe 33 to the fuel inlet of each fuel injection valve 31. It is connected to the side end (upper end).

The fuel injection valve 31 is an electromagnetic fuel injection means whose valve opening time is automatically controlled by an electronic control unit of the internal combustion engine, as is well known. One end of the fuel supply pipe 33 is
As shown in FIG. 3, it projects outside the air cleaner case 12, and a fuel supply pump is connected to the projecting end through a fuel pipe (not shown), and the fuel is pumped from the fuel supply pump to the fuel supply pipe 33. .

Incidentally, as described above, the internal combustion engine 10
A space 23 having a predetermined interval is formed between the air cleaner case 12 and the surge tank 22 arranged to extend in parallel with the cylinder row of the throttle body 19.
Are arranged side by side in the horizontal direction. Since the space 23 is a space opened to both sides and an upper part of the internal combustion engine 10 in the cylinder row direction, a sufficient space can be secured for both sides and an upper part of the throttle body 19 in the cylinder row direction.

Therefore, by arranging the shaft 21 of the throttle valve 20 in the throttle body 19 so that the axial direction thereof is parallel to the cylinder row direction, a throttle valve driving mechanism is formed below the throttle body 19 in FIG. A valve drive lever 34 and a rotary potentiometer 35 serving as a throttle valve opening detection mechanism on the upper side of the throttle body 19 in FIG. The valve drive lever 34 is connected to one end of the shaft 21 and the rotary potentiometer 35 is connected to the other end.

At a position upstream of the throttle valve 20 of the throttle body 19 (at a position closer to the air cleaner case 12 than the throttle valve 20), an air flow meter 36 for measuring the intake air amount of the internal combustion engine 10 is provided on the upper surface side of the throttle body 19. Are located. The air flow meter 36 can also be arranged with a sufficient space since the space 23 is opened upward.

Next, the operation of the above configuration will be described.
When the internal combustion engine 10 is operated, the air cleaner case 12
The outside air is sucked from an air inlet 15 of the air cleaner 15, and the air flows into a dust-side space 16 in the case 12, and then passes through a filtering portion 14a of the air cleaner 14 as shown by an arrow a in FIG. As a result, dust and the like in the air are removed by the filtration unit 14a, and the intake air is cleaned.

Next, the cleaned intake air flows from the space 17 on the clean side through the outlet duct 18 to the throttle body 19, where the flow rate is adjusted by the throttle valve 20. Next, the intake air passes through the surge tank 22 to absorb the pulsation, and thereafter, the intake air is distributed to each of the intake manifold pipes 24a to 24d. On the other hand, the fuel is pressure-fed by a fuel supply pump (not shown) and distributed to each fuel injection valve 31 via a fuel supply pipe 33. Then, by opening each fuel injection valve 31 as appropriate by electronic control, fuel is injected into outlet-side portions of each of the intake manifold pipes 24a to 24d. Therefore, the fuel and the air become a mixture, and are sucked into each cylinder from the intake port 10b of the internal combustion engine 10.

In the throttle body 19, one end of the shaft 21 of the throttle valve 20 is connected to a valve drive lever 34 which constitutes a throttle valve drive mechanism. The accelerator mechanism of the vehicle is connected to the valve drive lever 34 via a cable or the like. Since it is mechanically connected, the amount of rotation (opening) of the throttle valve 20 is adjusted according to the amount of operation of the accelerator mechanism, and the amount of intake air is adjusted.

At the same time, the opening of the throttle valve 20 is detected by a rotary potentiometer 35 connected to the other end of the shaft 21 and is input to an electronic control unit (not shown) of the internal combustion engine. The intake air amount of the internal combustion engine 10 is measured by an air flow meter 36 disposed on the throttle valve upstream side of the throttle body 19, and is input to the control device.

(Other Embodiments) In the above embodiment, as shown in FIG. 1, the internal combustion engine 10 is slightly inclined with respect to the vertical direction, while the air cleaner case 12,
Although the throttle body 19 and the surge tank 22 are arranged side by side in the horizontal direction, the internal combustion engine 10 is arranged in the vertical direction, while the air cleaner case 12, the throttle body 19 and the surge tank 22 are arranged. The layout may be such that the user is slightly inclined from the horizontal direction.

In the above embodiment, a mechanical drive type throttle valve 20 operated by a drive lever 34 mechanically connected to an accelerator mechanism of a vehicle has been described. The present invention can be favorably applied to a device having an electric actuator mechanism such as a motor and using an electronically controlled throttle valve for electrically controlling the operation amount of the electric actuator mechanism according to the operation amount of an accelerator mechanism of a vehicle. Of course, it can be implemented.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a main part of an intake device for an internal combustion engine, showing an embodiment of the present invention.

FIG. 2 is a front view of the intake device of FIG. 1;

FIG. 3 is a top view of the intake device of FIG. 1;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Intake device, 12 ... Air cleaner case, 13 ... Cap member, 14 ... Air cleaner, 1
8 ... Exit duct, 19 ... Throttle body, 20 ... Throttle valve, 21 ... Shaft, 22 ... Surge tank,
24a to 24d: intake manifold pipe, 25: flange portion, 34: throttle valve drive lever, 35: potentiometer for detecting throttle valve opening.

Claims (6)

[Claims] An air cleaner case (1) accommodating an air cleaner (14) for filtering intake air to an internal combustion engine (10).
2) and a throttle body (1) which is provided downstream of the air cleaner case (12) and has a built-in throttle valve (20) for adjusting the amount of intake air to the internal combustion engine (10).
9), a surge tank (22) provided on the air downstream side of the throttle body (19), and a branch from the surge tank (22) and extending toward a plurality of cylinders of the internal combustion engine (10). A plurality of intake manifold pipes (24a to 24c), wherein the air cleaner case (12) and the surge tank (22) are arranged so as to extend in parallel with a cylinder row of the internal combustion engine (10); (12, 22), a space (23) opened on both sides and an upper side in the cylinder row direction of the internal combustion engine (10) is formed, and the throttle body (19) is arranged in the space (23). An intake device for an internal combustion engine, comprising: 2. The internal combustion engine according to claim 1, wherein a shaft (21) for driving the throttle valve (20) is arranged in parallel with a cylinder row of the internal combustion engine (10). Intake device. 3. An air cleaner case (1) containing an air cleaner (14) for filtering intake air to an internal combustion engine (10).
2) and a throttle body (1) which is provided downstream of the air cleaner case (12) and has a built-in throttle valve (20) for adjusting the amount of intake air to the internal combustion engine (10).
9), a surge tank (22) provided on the air downstream side of the throttle body (19), and a branch from the surge tank (22) and extending toward a plurality of cylinders of the internal combustion engine (10). A plurality of intake manifold pipes (24a to 24c) are provided, and the air cleaner case (12) and the surge tank (22) are arranged side by side in a horizontal direction.
A space (23) is formed between the air cleaner case (12) and the surge tank (22) in the longitudinal direction and on the upper side between the air cleaner case (12) and the surge tank (22). 19) An intake device for an internal combustion engine, wherein the intake device is arranged. 4. A shaft (21) for driving the throttle valve (20) is connected to the air cleaner case (1).
The intake device for an internal combustion engine according to claim 3, wherein the intake device (2) and the surge tank (22) are arranged in parallel with a longitudinal direction of the surge tank (22). 5. A throttle valve driving mechanism (34) is connected to one end of the shaft (21), and a throttle valve opening detection mechanism (35) is connected to the other end of the shaft (21). 5. The intake device for an internal combustion engine according to claim 2, wherein the intake device is provided. 6. The air cleaner case (12) is arranged close to the internal combustion engine (10), and the surge tank (22) is located at a position away from the internal combustion engine (10) with respect to the air cleaner case (12). The intake manifold pipes (24a to 24c) are disposed below the surge tank (22) from below the internal combustion engine (1).
The intake device for an internal combustion engine according to any one of claims 1 to 5, wherein the intake device is disposed toward (0).