JPH09242547A - Intake device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an intake device by connecting intake ducts from second and third cylinders to two upper connecting portions, respectively, while connecting intake ducts from first and fourth cylinders to two lower connecting portions, respectively, in a surge tank to which the four intake ducts for a four-cylinder internal combustion engine are connected. SOLUTION: Four connecting portions 21-24 are arranged at one side face 13b of a surge tank 13 in a rectangular form being longer in a vertical direction. Intake ducts 15-18 are curved from respective cylinders A1-A4 toward the side face 13b. Thereafter, the intake ducts 15, 18 are connected to the lower connecting portions 21, 24, respectively; while the intake ducts 16, 17 are connected to the upper connecting portions 22, 23, respectively. Consequently, it is possible to increase a gap dimension in a vertical direction between the upper connecting portions 22, 23 and the lower connecting portions 21, 24, and further, to avoid intake pulses of the cylinders A1 and A4 from interfering with each other inside the surge tank 13 even if a gap dimension between the connecting portions 21 and 24 is decreased.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inertial engine by connecting an intake pipe line made of a pipe independently connected to each cylinder of an internal combustion engine to one surge tank downstream of an air cleaner. The present invention relates to an intake device that utilizes the effect to supercharge intake air.

[0002]

2. Description of the Related Art JP-A-4-91360 as a prior art
The publication discloses an inertial supercharging type intake device as shown in FIGS. 6 and 7. That is, the four cylinders A1, A
A surge tank 2 connected downstream to an air cleaner (not shown) is disposed at a side of the internal combustion engine 1 provided with 2, A3 and A4 and near one end of the internal combustion engine 1. On the side surface 2a of the tank 2 that is substantially perpendicular to the crank axis 1a of the internal combustion engine 1, the four connecting portions 3, 4, 5,
6 are provided in a square array, and the respective connection parts 3, 4, 5,
6, the connecting portion 3 on the upper side and farther from the internal combustion engine 1
In addition, the intake pipe line 7 from the first cylinder A1 is connected to the connecting portion 4 at a site close to each internal combustion engine 1 on the upper side, and the intake pipe line 8 from the second cylinder A2 is located on the lower side and farther from the internal combustion engine 1. The intake pipe 9 from the third cylinder A3 to the connecting portion 5 of the side portion,
The intake pipe lines 10 from the fourth cylinder are connected to the connecting portions 6 on the lower side, which are close to the internal combustion engines 1.

[0003]

However, in the four-cylinder internal combustion engine, the ignition sequence is set to the first cylinder A1-the second cylinder A2-the fourth cylinder A4-the third cylinder A3, or Since the first cylinder A1-third cylinder A3-fourth cylinder A4-second cylinder A2 are set, as in the above-mentioned prior art, the upper side of the connection parts 3, 4, 5, 6 in the surge tank 2 is set. The first cylinder A1 is connected to the two connecting portions 3 and 4.
Intake pipe line 7 from and the intake pipe line 8 from the second cylinder A2
To the two connecting parts 5 and 6 on the lower side of the third cylinder A3.
From the fourth cylinder A4 and the intake pipe 9 from the
The configuration in which 0s are connected to each other has the following problems.

That is, in the configuration of the prior art, of the connecting portions 3, 4, 5 and 6 of the surge tank 2, the connecting portion 3 from the first cylinder A1 to the intake pipe line 7 and the connecting portion 3 from the second cylinder A2 are connected. The connecting portion 4 to the intake pipe 8 is laterally adjacent to each other, while the connecting portion 5 to the intake pipe 9 from the third cylinder A3 and the connecting portion 6 to the intake pipe 10 from the fourth cylinder A4 are horizontal. Since they are adjacent to each other, the ignition order is as follows: first cylinder A1-second cylinder A2-fourth.
Cylinder A4-third cylinder A3 and first cylinder A1-third cylinder A
In any of the cases of 3-third cylinder A4 to second cylinder A2, in the surge tank 2, the first cylinder A1 and the second cylinder A2
The intake pulsations interfere with each other because the ignition order is adjacent to that of the cylinder A2, and the third cylinder A3 and the fourth cylinder
The intake pulsation also interferes with the cylinder A4 due to the fact that the ignition sequences are adjacent to each other, and the effect of inertia supercharging is reduced due to the interference of the intake pulsation.

Therefore, in the above prior art, in the surge tank 2, the intake pulsations in the first cylinder A1 and the second cylinder A2 interfere with each other, and the third cylinder A
In order to prevent the intake pulsations in the third and fourth cylinders A4 from interfering with each other, the lateral space dimension S'of each of the connection parts 3, 4, 5, 6 in the surge tank 2 is suppressed.
However, if the lateral spacing dimension S'is increased, the lateral width dimension W'in the surge tank 2 increases, which in turn leads to an increase in the size of the intake device, and also the internal combustion engine 1 Therefore, the projecting dimension L'from the side surface to the outer surface of the surge tank 2 increases.

An object of the present invention is to provide an intake device that solves this problem.

[0007]

In order to achieve this technical object, the present invention discloses that a surge tank connected to a downstream side of an air cleaner is provided at a side portion of an internal combustion engine having four cylinders. , On one side of this surge tank,
In an intake device provided with four connecting portions, each of which is connected to an intake pipe from each cylinder, the four connecting portions in the surge tank are arranged in a vertically long rectangular array, To each of the upper two connecting portions of the respective connecting portions, each of the intake pipeline from the second cylinder and the intake pipeline from the third cylinder is connected, or the intake pipeline from the first cylinder and the fourth cylinder are connected. While connecting each of the intake pipes from the first cylinder to the two lower connection parts, or connecting the intake pipes from the first cylinder and the intake pipe from the fourth cylinder to each other. And the intake pipe line from the third cylinder are connected. ".

[0008]

Operation and effect of the present invention
Of the connecting parts in the surge tank, the connecting part for the second cylinder and the connecting part for the third cylinder which are laterally adjacent on the upper side, and the connecting part for the first cylinder and the fourth cylinder which are laterally adjacent on the lower side among the connecting parts The vertical space between the connecting portion and the connecting portion for the first cylinder and the connecting portion for the fourth cylinder that are adjacent to each other in the horizontal direction on the upper side, and the connecting portion for the second cylinder that is adjacent to the connecting portion on the lower side in the horizontal direction. And the vertical space between the third cylinder connecting portion,
Since the space below the surge tank can be increased, the intake pulsation in the second cylinder and the third
It is possible to prevent the intake pulsation in the cylinder, the intake pulsation in the first cylinder, and the intake pulsation in the fourth cylinder from interfering with each other in the surge tank.

Further, in any case of the ignition sequence between the ignition of the second cylinder and the ignition of the third cylinder, the ignition of the fourth cylinder always exists, so that the ignition is performed in the lateral direction on the upper side. Even if the distance between the second cylinder connecting portion and the third cylinder connecting portion adjacent to each other or the distance between the first cylinder connecting portion and the fourth cylinder connecting portion is narrowed, It is possible to prevent the intake pulsation in the second cylinder and the intake pulsation in the third cylinder from interfering with each other in the surge tank.

Furthermore, between the ignition of the first cylinder and the ignition of the fourth cylinder, the ignition sequence is in any case,
Since the ignition of the third cylinder is always present, the distance between the first cylinder connecting portion and the fourth cylinder connecting portion that are laterally adjacent to each other on the lower side, or the second cylinder connecting portion Third
Even if the space between the cylinder connecting portion is narrowed, it is possible to prevent the intake pulsation in the first cylinder and the intake pulsation in the fourth cylinder from interfering with each other in the surge tank.

Therefore, according to the present invention, the lateral gap between the connecting portions of the surge tank can be reliably reduced in the interference of intake pulsation between the cylinders, in other words, the effect of inertial supercharging. Since it can be made narrower while maintaining a sufficient value, the lateral dimension of the surge tank can be reduced and the intake device can be downsized.
This has the effect of reducing the protrusion size from the side surface of the internal combustion engine to the outer surface of the surge tank.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. In this figure, reference numeral 11 is an internal combustion engine provided with a first cylinder A1, a second cylinder A2, a third cylinder A3 and a fourth cylinder A4 in a line.
3A and 3B respectively show intake devices mounted on a longitudinal side surface 11b of the internal combustion engine 11 which is parallel to the crank axis 11a.

The intake device 12 has a surge tank 13 arranged laterally of the internal combustion engine 11 and cylinders A1, A2, A3, A4 for the longitudinal side surface 11b of the internal combustion engine 11.
It is constituted by intake pipe lines 15, 16, 17, 18 made of a metal pipe such as a steel pipe connected to a flange portion 14 at the location. In the surge tank 13, a throttle body 19 having a built-in throttle valve is connected to a side surface 13a of the left and right side surfaces 13a and 13b of the internal combustion engine 11 which is perpendicular to the crankshaft axis 11a and which is close to one end of the internal combustion engine 11. An intake passage 20 from an air cleaner (not shown) is connected to the throttle body 19.

On the other side surface 13b of the left and right side surfaces 13a, 13b of the surge tank 13, four connecting portions 21, 22, 23, 24 are provided in a vertically long rectangular array. On the other hand, the cylinders A1, A2, A
3, the intake pipe lines 15, 16, 17, 18 from A4 are curved upward in the lateral direction, and then the surge tank 13
Of the surge tank 13 after being curved so as to be directed to the other side surface 13b of the surge tank 13.
2, 23, and 24, the intake pipe line 15 from the first cylinder A1 is connected to the connection portion 21 at a lower portion and a portion closer to the internal combustion engine 11, and the connection portion 24 is provided at a lower portion and a portion further from the internal combustion engine 11. While connecting the intake pipe lines 18 from the fourth cylinder A4 to the connecting portion 22 in the upper portion of the connecting portions 21, 22, 23, 24 in the surge tank 13 and close to the internal combustion engine 11, The second cylinder A
The intake pipe line 16 from No. 2 is configured to connect the intake pipe lines 17 from the third cylinder A3 to the connecting portions 23 at the upper side and far from the internal combustion engine 11.

With this configuration, among the connecting portions 21, 22, 23, 24 in the surge tank 13, the second cylinder connecting portion 22 and the third cylinder connecting portion 23 that are laterally adjacent to each other on the upper side are provided. And the first laterally adjacent lower side
Since the vertical space T between the cylinder connecting portion 21 and the fourth cylinder connecting portion 24 can be increased by utilizing the space below the surge tank 13, the intake pulsation in the second cylinder A2 can be increased. It is possible to prevent the intake pulsation in the third cylinder A3, the intake pulsation in the first cylinder A1 and the intake pulsation in the fourth cylinder A4 from interfering with each other in the surge tank 13.

Further, the ignition of the second cylinder A2 and the third cylinder A2
The ignition sequence between the first and second cylinders A1-A2
Cylinder A2-4th cylinder A4-third cylinder A3, or first
Cylinder A1-third cylinder A3-fourth cylinder A4-second cylinder A2
In any of the above cases, since the ignition of the fourth cylinder A4 is always present, the distance between the second cylinder connecting portion 22 and the third cylinder connecting portion 23 that are laterally adjacent to each other on the upper side is increased. Even if S is narrowed, it is possible to prevent the intake pulsation in the second cylinder A2 and the intake pulsation in the third cylinder A3 from interfering with each other in the surge tank 13.

Furthermore, between the ignition of the first cylinder A1 and the ignition of the fourth cylinder A4, the ignition sequence is as follows:
Second cylinder A2-fourth cylinder A4-third cylinder A3, or
In any case of the first cylinder A1 to the third cylinder A3 to the fourth cylinder A4 to the second cylinder A2, the ignition of the third cylinder A3 is always present, so that they are laterally adjacent to each other on the lower side. First cylinder connection 21 and fourth cylinder connection 24
Even if the interval dimension S is narrowed between the two, it is possible to prevent the intake pulsation in the first cylinder A1 and the intake pulsation in the fourth cylinder A4 from interfering with each other in the surge tank 13.

Therefore, the lateral spacing S of the connecting portions 21, 22, 23, 24 in the surge tank 13 can surely reduce the interference of intake pulsation between the cylinders A1, A2, A3, A4. Since the width can be narrowed in this state, the lateral dimension W of the surge tank 13 can be reduced, and the protruding dimension L from the longitudinal side surface 11b of the internal combustion engine 11 to the outer side surface of the surge tank 13 can be reduced.

The intake pipe line 1 from the first cylinder A1
The intake pipe line 18 from the fifth cylinder A4 and the intake pipe line 1 from the second cylinder A2 are connected to the lower connecting portions 21 and 24.
When connecting the intake pipe lines 17 from the sixth and third cylinders A3 to the upper connecting portions 22 and 23, respectively, as shown in FIG. 5, instead of the configuration shown in FIG. The second cylinder connecting portion 22 on the upper side is connected to the internal combustion engine 1
The third cylinder connecting portion 23 is provided at a position farther than 1 from the internal combustion engine 1
While the first cylinder connecting portion 21 on the lower side is provided farther from the internal combustion engine 11, the fourth cylinder connecting portion 24 may be provided at a portion closer to the internal combustion engine 11, while the first cylinder connecting portion 21 is provided at a portion close to the internal combustion engine 11. Of.

Further, as described above, the intake pipe line 16 from the second cylinder A2 and the third cylinder A3 are connected to the upper two connecting portions of the four connecting portions arranged in a vertically long rectangular shape.
2 instead of connecting the intake pipe line 17 from the first cylinder A1 and the intake pipe line 18 from the fourth cylinder to the two lower connection parts. The intake pipe line 15 from the first cylinder A1 and the intake pipe line 18 from the fourth cylinder are connected to the connection part, and the second cylinder A is connected to the two lower connection parts.
Even if the intake pipe line 16 from No. 2 and the intake pipe line 17 from the third cylinder A3 are connected to each other, the same purpose can be achieved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

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

FIG. 3 is a side view taken along the line III-III in FIG. 1;

FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.

FIG. 5 is a cross-sectional view showing another embodiment of the present invention.

FIG. 6 is a plan view showing a conventional example.

FIG. 7 is a side view of FIG. 6;

[Explanation of symbols]

 11 Internal Combustion Engine 11a Crank Axis 12 Intake Device 13 Surge Tank 14 Flange Part 15, 16, 17, 18 Intake Pipeline 19 Throttle Body 21, 22, 23, 24 Connection Part

Claims (1)

[Claims] 1. A surge tank connected to a downstream side of an air cleaner is arranged at a side portion of an internal combustion engine having four cylinders, and four connecting portions are provided on one side surface of the surge tank. In an intake device formed by connecting the intake pipes from the respective cylinders to the respective connecting portions, the four connecting portions in the surge tank are arranged in a vertically long rectangular array, and the upper side of the connecting portions To each of the two connecting portions of the intake pipe from the second cylinder and the intake pipe from the third cylinder, or the intake pipe from the first cylinder and the intake pipe from the fourth cylinder. While connecting each of them, the lower two connecting portions are respectively connected to the intake pipeline from the first cylinder and the intake pipeline from the fourth cylinder, or
An intake system for an internal combustion engine, wherein an intake pipe line from a cylinder and an intake pipe line from a third cylinder are connected to each other.