JP2002295322A - Fitting structure of suction noise reduction device in inlet passage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide fitting structure for fitting a suction noise reduction plate 2 installed in an inlet passage 1 of an internal combustion engine to a gasket. SOLUTION: A bent part 21 installed in the suction noise reduction plate 2 and the gasket 3 are fit to an annular groove 11 in the inlet passage 1. Thereby, correct positioning is performed and high sealing performance is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for mounting an intake passage suitable for use in an internal combustion engine of an automobile.

[0002]

2. Description of the Related Art Conventionally, in an internal combustion type engine, a throttle valve is provided in an intake passage leading to a combustion chamber, and combustion in a cylinder combustion chamber is controlled by opening and closing the throttle valve. When the throttle valve is rapidly opened, a large amount of intake air is instantaneously taken and flows in a lump, and the large amount of intake air generates abnormal noise (intake noise) in an intake passage or a surge tank. This noise is remarkable in the case of an intake passage made of a synthetic resin material, and a structure in which a net is arranged behind a throttle valve has been proposed as a countermeasure for the noise. (For example, Japanese Patent Application Laid-Open No. 11-1
No. 41416)

[0003]

In order to suppress such abnormal noise in the intake passage, it is a simple countermeasure to form the intake passage with an aluminum material having relatively low noise generation.
It is inferior to the synthetic resin intake passage in terms of weight reduction and molding cost or improvement in fuel efficiency, and does not meet the demands of the times. Therefore, the structure of the intake passage made of a synthetic resin material having a net behind the throttle valve as in the above-mentioned Japanese Patent Application Laid-Open No. 11-141416 is an effective prevention method, but this net is attached to the intake passage. Various problems have occurred and solutions are awaited.

More specifically, when the net is attached to the intake passage, as shown in FIG. 3 in detail with reference to the drawings, the flange portion 51 of the net 5 is attached to the intake passage 1 and its mounting surface 1 '.
And a plurality of gaskets 6 and 6 ′ are pinched and fixed, so that it is easy to cause a positional shift when each of them is mounted, and even when tightening the gaskets 6 and 6 ′.
If the net 5 is directly affected by the elastic deformation of 6 'and is deteriorated, the net 5 may be distorted or deformed. The present invention has been made in view of such disadvantages,
It is an object of the present invention to provide an intake noise reduction device mounting structure for an intake passage that is accurately mounted to effectively reduce noise, and has a high sealing property.

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described with reference to the drawings. As shown in FIG. 1, there is provided an intake structure of an internal combustion engine, and an intake noise reduction device provided in an intake passage 1 communicating with a combustion chamber of the internal combustion engine. As for the mounting structure, an intake noise reducing plate 2 is provided in the intake passage 1, and an annular groove 11 is formed in one mounting surface of the intake passage 1 that sandwiches the intake noise reducing plate 2, as shown in FIG. As shown in (1), a bent portion 21 is formed by bending an end of a mounting flange of the intake noise reducing plate 2, and the bent portion 21 and the annular gasket 3 are inserted into the annular groove 11 together. And

The intake noise reducing plate 2 is provided behind the throttle valve 4 as shown in FIG. 1, and is arranged in any of a mesh, honeycomb, comb, or weir shape, or a combination of these shapes. It is characterized by being established.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the mounting structure of the intake noise reducing device for an internal combustion engine of the present invention, in the mounting structure of the intake noise reducing plate 2 to the intake passage 1 as described above, the end of the mounting flange is bent. A bent portion 21 is formed, and the bent portion 21 and the gasket 3 are both inserted into and fixed to an annular groove 11 cut out on one of the mounting surfaces of the intake passage 1. At the same time, accurate positioning is achieved by fitting, and at the same time, the mounting flange is in close contact with the mounting surface and serves to prevent shape deformation. The gasket 3 inserted into the annular groove 11 together with the bent portion 21 is
, And is tightened by the mounting surface, so that it closely adheres to the mounting surface and the bent portion 21 and exhibits high sealing performance.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to carry out the present invention, as shown in FIG. 1, in this intake noise reduction device mounting structure, a noise absorption reduction plate 2 is provided behind a throttle valve 4, which also affects the flow of intake air from the throttle valve 4. The abrupt intake air flow is crushed by the sound absorption reduction plate 2 to disperse the flow mass and reduce the intake noise. Various shapes have been proposed so far for effective crushing and dispersing.However, the smoothness of intake air inflow and the buffering against flow are contradictory. It is not shown, and for example, any one of a full or partial net-like shape, a honeycomb shape, a comb-like shape, a partially closed weir shape, and the like, or a combination of these can be arranged. (Neither is shown)

The annular groove 1 of the annular gasket 3
As shown in FIG. 2, it is important that the gasket 3 is disposed on the outside of the bent portion 21 provided on the mounting flange. It is considered that the sealing performance is greatly reduced because it is not used. With this arrangement, the gasket 3 applies the deformation pressure due to the tightening from the inside of the annular groove 11 to the mounting surface and the bent portion 2.
It is compressed and deformed toward the surface of No. 1 and surely adheres to the surrounding parts, so that it exhibits good fixability and sealability.

The shape of the gasket 3 is preferably substantially L-shaped in cross section surrounding the mounting flange or the bent portion 21 as shown in FIG. 2, but is not limited thereto. Various shapes are also selectable.

[0011]

According to the present invention, accurate positioning is achieved by fitting the bent portion 21 and the gasket 3 into the annular groove 11 at the same time, and at the same time, they play a role of preventing shape deformation by closely fitting to the mounting surface. It exhibits a large intake noise reduction effect and high sealing performance. In addition, the mounting workability thereof is extremely simple and reliable, and the mounting deficiencies are eliminated. As described above, since the sound absorption reducing plate 2 is accurately and elastically fixed by the bent portion 21 and the gasket 3, the shape retention is high, and the degree of freedom in selecting the crushing shape to be provided is large.

[Brief description of the drawings]

FIG. 1 is a sectional view showing one embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part of FIG.

FIG. 3 is a sectional view showing a conventional structure not using the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake passage 11 Annular groove 2 Intake sound reduction plate 21 Bending part 3 Gasket 4 Throttle valve 5 Net

Claims (3)

[Claims] 1. An intake noise reduction device mounting structure for an internal combustion engine having an intake passage leading to a combustion chamber, wherein an intake noise reduction plate is provided in the intake passage, and the intake passage sandwiches the intake noise reduction plate. An annular groove is cut in one of the mounting surfaces of the above, and an end of a mounting flange of the intake sound reducing plate is bent, and the bent portion and an annular gasket are attached to the annular groove together. Attached structure for intake noise reduction device in the passage. 2. The installation structure of claim 1, wherein the annular gasket is disposed outside a bent portion of the mounting flange. 3. The sound absorption reducing plate is provided behind the throttle valve within a range that is affected by the flow of intake air by the throttle valve, and may be any of a mesh, a honeycomb, a comb, a weir, or a combination thereof. 3. The installation structure for an intake noise reduction device for an intake passage according to claim 1, wherein the installation device is disposed at least.