JPH09242627A - Intake device in internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the rigidity of each intake line without causing the increase of a manufacturing cost, and also certainly support each intake line against an internal combustion engine, and so on, in an intake device which is formed by connecting pipe-made intake lines from air cylinders to a surge tank connected to the downstream side of an air cleaner. SOLUTION: While stay members 13, 14 are parted from each other and arranged per each interval between two intake lines located adjacently to each other out of intake lines in the middle of intake lines 5, 6, 7, and both ends of the stay members 13, 14 are fixed to the intake lines, a mounting member 15 for mounting the tip of a supporting bracket member 16 on an internal combustion engine is fixed to both of two stay members 13, 14 located adjacently to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cylinder internal combustion engine, in which an intake pipe line made of a metal pipe, which is independently connected to each cylinder, is connected to one surge tank downstream of an air cleaner. Thus, the present invention relates to an intake device that utilizes the inertial effect to achieve supercharging of intake air.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication (Kokai) No. 4-76263 and Japanese Utility Model Laid-Open No. 4-91360 make a metal pipe connected to each cylinder in a multi-cylinder internal combustion engine in a surge tank having an intake passage from an air cleaner connected to one end. Has proposed an inertial supercharging type intake device having a structure in which each of the intake pipe lines is bent from the lateral direction to the upward direction and then connected.

When the intake pipe from one surge tank to each cylinder is made of a metal pipe in this way, the weight of the intake device can be reduced, but on the other hand, Each of the intake pipes made of metal pipe has a lower rigidity than the case where the entire intake device is made by casting, so that not only the throttle body attached to the surge tank vibrates greatly, but also when the vehicle collides, etc. The entire intake pipe line was bent and deformed from the root of the internal combustion engine.

Then, as a prior art, the actual Kaihei 7-30
Japanese Patent No. 356 discloses that in the middle of each intake pipe line made of a metal pipe,
It is proposed that the stay member be fixed to one stay member that extends across each intake pipe line and that this stay member be supported by an internal combustion engine or the like via a bracket member.

[0005]

However, since each intake pipe line is formed by bending a metal pipe,
Since there is a large dimensional error in the portion fixed to the stay member in the middle of each intake pipe, when the respective intake pipes are fixed to one stay member, the stay member is A great deal of work is required to say that the stay member must be bent to match the actual product so that the stay member contacts each of the intake conduits at the same time,
As a result, there was a problem that the cost would increase significantly.

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 downstream of an air cleaner is provided with each intake pipe line connected to each cylinder in a multi-cylinder internal combustion engine. In an intake device that is connected after being bent from sideways to upwards, a stay member is divided in the middle part of each intake pipe line between two adjacent intake pipe lines of each intake pipe line. And both ends of the stay member are fixed to the intake pipe, and a mounting member for mounting the front end of the support bracket member to the internal combustion engine is provided for both of the adjacent two stay members. It will be fixed against. "

[0008]

As described above, the stay member that connects the middle of each intake conduit is divided into two intake conduits that are adjacent to each other in each intake conduit. Since it suffices to contact both ends of the two intake pipe lines adjacent to each other, as in the prior art,
It is possible to omit bending the stay member so as to be in contact with each of the three or more intake pipe lines at the same time.

Further, the attachment member for attaching the tip of the support bracket member to the internal combustion engine or the like is fixed to both of the two adjacent stay members of the respective stay members, whereby the separation is achieved. Since the two stay members can be integrally connected as a mounting member, the rigidity of each intake pipe can be reliably improved, and each intake pipe can be reliably connected to the internal combustion engine and the like. , Can be firmly supported.

Therefore, according to the present invention, the surge tank portion of the intake device vibrates greatly, and the bending deformation occurs in each intake pipe line without impairing the workability and eventually increasing the cost. Without doing
It has an effect that can be surely reduced.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. In the figure, reference numeral 1 is the first cylinder A.
A three-cylinder internal combustion engine having a first cylinder A2, a second cylinder A2, and a third cylinder A3 arranged in a line, and reference numeral 2 is an intake device attached to a longitudinal side surface 1b of the internal combustion engine 1 which is parallel to the crank axis 1a.

The intake device 2 is connected to the surge tank 3 arranged laterally of the internal combustion engine 1 and the flange portion 4 at each of the cylinders A1, A2 and A3 with respect to the longitudinal side surface 1b of the internal combustion engine 1. Intake line 5, made of metal pipe such as steel pipe
6 and 7. Further, in the surge tank 3, a throttle body 8 having a built-in throttle valve is connected to a side surface 3a of one of the left and right side surfaces 3a and 3b of the internal combustion engine 1 which is perpendicular to the crankshaft axis 1a, which is close to one end of the internal combustion engine 1. This throttle body 8
An intake passage 9 from an air cleaner (not shown) is connected to.

On the other side surface 3b of the left and right side surfaces 3a, 3b of the surge tank 3, three connecting portions 10, 11, 12 are provided in a substantially triangular arrangement. On the other hand, the intake pipe lines 5 from the cylinders A1, A2, A3 are
After bending 6 and 7 from the side to the side and then toward the other side surface 3b of the surge tank 3, each connection portion 1 of the surge tank 3 is bent.
0, 11, and 12 are connected.

In the middle part of each of the intake pipes 5, 6 and 7, a metal plate is formed at a portion between the intake pipe 5 for the first cylinder A1 and the intake pipe 6 for the second cylinder A2. The first stay member 13 of the second cylinder A2 to the intake pipe line 6 and the third cylinder A2.
The second stay member 14 also made of a metal plate is mounted on a portion between the third intake pipe passage 7 and the third intake pipe passage 7, so that the stay members 13 and 14 are connected to each other among the intake pipe passages 5, 6, and 7. The two intake pipes adjacent to each other are arranged separately from each other, and both ends of the first stay member 13 are connected to the intake pipe 5 for the first cylinder A1 and the second intake pipe 5 for the first cylinder A1.
Both ends of the second stay member 14 are fixed to both the intake pipe 6 for the cylinder A2 by welding, and the intake pipe 6 for the second cylinder A2 and the intake pipe 7 for the third cylinder A3 are connected to each other. Fixed by welding.

Further, at a portion between the stay members 13 and 14, the mounting member 1 formed of a metal plate in a substantially U-shape.
5, the mounting member 15 is provided so as to be fixed to both stay members 13 and 14 by welding, and the lower end of the mounting member 15 is mounted on the side surface of the internal combustion engine 1. The tip of the bracket member 16 is attached.

In this way, the stay member is connected to the first cylinder A1.
Stay member 13 mounted between the intake pipe line 5 for the second cylinder and the intake pipe line 6 for the second cylinder A2, and the intake pipe line 6 for the second cylinder A2
And the second stay member 14 mounted between the third cylinder A3 intake pipe passage 7 and the third cylinder A3 intake pipe 7, and thus the first stay member 13 has both ends thereof adjacent to each other. Only the passage 5 and the intake pipe 6 for the second cylinder A2 need to come into contact with each other, and the second stay member 14 has its both ends adjacent to each other. Since it suffices to contact only the intake conduit 7 for the cylinder A3, the stay member should be in contact with each of the three or more intake conduits 5, 6 and 7 at the same time as in the prior art. It is possible to omit bending to match the actual product.

Further, since the mounting member 15 is fixedly attached to both the first stay member 13 and the second stay member 14, both the stay members 13 and 14 are used as the mounting member 15. Since they can be integrally connected, the rigidity of each intake pipe line 5, 6, 7 can be surely improved, and each of the intake pipe lines 5, 6, 7 can be surely connected to the internal combustion engine 1. , Can be firmly supported.

In the above description, the support bracket member 16 is mounted between the internal combustion engine 1 and the mounting member 15, but the present invention is not limited to this, and the support bracket member 16 is not limited to this. Is mounted between the vehicle body frame and the mounting member 15 in the vehicle, or is mounted between the mounting member and the mounting member 15 for elastically supporting the internal combustion engine 1 with respect to the vehicle body frame in the vehicle. You may also hang it.

Further, as shown in FIG. 2, the intake device 2
The surge tank 3 attached to the surge tank 3 is attached to the surge tank 3 on the vertical line 17 passing through the center of the mounting member 15 or close to the vertical line 17, Since the moment between the surge tank 3 and the mounting member 15, which is a support point in the device 2, can be reduced, there is an advantage that the vibration of the surge tank 3 and the throttle body 8 mounted thereto can be significantly reduced.

[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. 3;

[Explanation of symbols]

 1 Three-Cylinder Internal Combustion Engine 1a Crank Axis 2 Intake Device 3 Surge Tank 4 Flange Part 5, 6, 7 Intake Pipe Line 8 Throttle Body 10, 11, 12 Connection Part 13, 14 Stay Member 15 Mounting Member 16 Support Bracket Member

Claims (1)

[Claims] 1. An intake system comprising a surge tank connected downstream of an air cleaner, and each intake pipe line connected to each cylinder of a multi-cylinder internal combustion engine after being curved from sideways to upward and then connected. A stay member in the middle of each intake pipe,
Of the intake pipes, the two intake pipes that are adjacent to each other are separated from each other, and both ends are fixed to the intake pipes.
An intake device for an internal combustion engine, wherein an attachment member for attaching the tip of a support bracket member to an internal combustion engine or the like is fixed to both of two adjacent stay members of each of the stay members.