JPH09144556A - Sound absorbing material and mounting method thereof for intake pipe of internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily mount a sound absorbing material so as to surely cover a prescribed part of an intake pipe, without necessity for a large mounting space. SOLUTION: A sound absorbing material 1 is formed into a cylindrical shape having an internal peripheral surface conforming to a peripheral surface of an intake pipe 5 in which the second absorbing material must be mounted, the sound absorbing material comprises a main unit part 11 having a slit 11a extended in the axial direction from one end toward the other end to cut divide one part in the circumferential direction and a plurality of pairs of lock parts 12 provided to be opposed to each other in both side parts of the slit 11a of the main unit part 11, a total unit is constituted by a molded unit integrally molded by a sound absorbing soft material. In a condition that a part of the slit 11a is opened in the circumferential direction through elastic deformation of the main unit part 11, the sound absorbing material is mounted from sideward in the peripheral surface of the intake pipe 5, to be mounted by locking the fellow opposed lock parts 12 through elastic restoration of the main unit part 11 by a lock fixture of clip or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sound absorbing material for an intake pipe of an internal combustion engine which is mounted on an intake pipe of an internal combustion engine mounted on a vehicle or the like and reduces intake noise generated in the intake pipe, and a mounting method thereof.

[0002]

2. Description of the Related Art An internal combustion engine mounted on a vehicle or the like is connected with an intake pipe for introducing a fuel mixture into the internal combustion engine, and it is known that a fluid flowing in the intake pipe produces intake noise. Has been. Particularly in recent years, intake sound often becomes a problem because more and more vehicles adopt the charge type for the purpose of improving the output of the internal combustion engine.

Conventionally, for example, Japanese Utility Model Laid-Open No. 51-156308 and Japanese Utility Model Laid-Open No. 61-1 address the problem of intake noise.
As disclosed in Japanese Patent No. 92558, etc., a resonator is attached to a part of the intake pipe, or a sound absorbing sheet or a sound insulating sheet is wound around the outer peripheral surface of the intake pipe, or a sound insulating structure is added. Measures such as combining are taken.

[0004]

However, when a resonator and a sound insulation structure are added, it is difficult to secure a mounting space because many devices are compactly housed in a narrow engine room. There are problems such as high cost. Further, in the case of a resonator, there is a problem in that the frequency of the intake sound, which is intended to be reduced, is limited to some extent, so that the effect in a wide frequency band cannot be expected.

When the sound absorbing sheet or the sound insulating sheet is directly wound around the intake pipe, the intake pipe is formed to be relatively long because of its arrangement, and is bent in a complicated manner to avoid interference with other equipment. Since it is formed in a state, there is a problem that it cannot be attached so as to completely cover the bent portion of the intake pipe. The present invention has been devised in view of the above problems, and does not require a large installation space and can be easily installed so as to surely cover a predetermined portion of the intake pipe, and a sound absorbing material for an intake pipe of an internal combustion engine. It is an issue to be solved to provide the mounting method.

[0006]

A sound absorbing material for an intake pipe of an internal combustion engine according to the present invention which solves the above problems is a sound absorbing material which is attached so as to cover the outer peripheral surface of the intake pipe of the internal combustion engine, and the intake air to be attached. A main body formed in a tubular shape having an inner peripheral surface coinciding with the outer peripheral surface of the pipe, having at least one slit extending in the axial direction from one end to the other end and dividing one location in the circumferential direction; And at least a pair of locking portions provided on opposite sides of the slit so as to face each other, and the whole is formed of a molded body integrally formed of a sound absorbing soft material. is there.

According to the method for mounting a sound absorbing material for an intake pipe of an internal combustion engine of the present invention, the sound absorbing member is formed into a tubular shape having an inner peripheral surface that matches the outer peripheral surface of the intake pipe to be mounted, and the shaft extends from one end to the other end. And a pair of engaging portions provided on both sides of the slit of the main body portion so as to face each other, and the whole body has sound absorbing flexibility. A sound absorbing material composed of a molded body integrally formed of a material is laterally attached to the outer peripheral surface of the intake pipe in a state where the slit portion is expanded in the circumferential direction through elastic deformation of the main body. It is characterized in that it is mounted and the opposing locking portions are locked and attached by elastic recovery of the main body.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view showing a part of a state where the sound absorbing material according to the present embodiment is attached to an intake pipe, and FIG. 2 is a sectional view of a part corresponding to line II-II in FIG. As shown in FIGS. 1 and 2, the sound absorbing material 1 of the present embodiment is formed so as to be attached to a substantially L-shaped bent portion of an intake pipe 5 connected to an internal combustion engine, and has a tubular shape. The main body 11 has a slit 11a extending in the axial direction, and four sets of locking portions 12 provided on opposite sides of the slit 11a of the main body 1 facing each other. It is configured.

The main body 11 is provided with an intake pipe 5 to be attached.
Has an inner peripheral surface that coincides with the outer peripheral surface of, and is formed in a cylindrical shape that is bent into a substantially L shape. One slit 11a extending in the axial direction from one end to the other end is formed in the bent inner portion of the main body 11, and the main body 11 is divided in the circumferential direction by the slit 11a. The sound absorbing material 1 is formed by injecting a urethane foam material to which a foaming agent or the like is added into a molding die to perform foam molding, and the main body 11 and the locking portion 12 are integrally formed of a urethane foam molded body. Is configured. This urethane foam molded article has a density of about 0.1 g / cm ³ and has good sound absorption.

The sound absorbing material 1 of this embodiment having the above structure is attached to the intake pipe 5 as follows. That is,
The slit 11a of the main body 11 is expanded in the circumferential direction through elastic deformation of the main body 11, and in this state, the intake pipe 5 is laterally attached to the outer peripheral surface to be attached. As a result, the main body portion 11 is brought into close contact with the outer peripheral surface of the intake pipe 5 due to the elastic return, and the locking portions 12 of each pair which are in a facing state are locked by the locking tool such as the clip 3. As a result, the sound absorbing material 1 is attached to a predetermined portion of the intake pipe 5 so as to cover the outer peripheral surface.

As shown in FIG. 3, the sound absorbing material 1 is attached to a part of the intake pipe 5 formed in a long and complicated curved state, but is attached to the other portion to be attached. The sound absorbing materials 1A, 1B, 1C, etc., which are formed in the same manner as the sound absorbing material 1 in correspondence with the above shape, can be attached in the same manner as described above. As described above, since the sound absorbing material 1 of the present embodiment is formed of the molded body formed of urethane foam having excellent sound absorbing properties so as to correspond to the outer peripheral surface shape of the intake pipe 5 to be attached, the resonator It does not require such a large installation space as in the case where a sound insulation structure is added, and can be installed so as to surely cover the bent portion of the intake pipe 5. Therefore, it is possible to mount the intake pipe 5 so as to efficiently and effectively cover the portion of the intake pipe 5 that is the source of the intake noise, and it is possible to take measures against the intake noise at low cost.

Further, the sound absorbing material 1 of this embodiment has a main body 1
Since it is easy to partially change the thickness of No. 1, it is possible to effectively take measures against intake noise. Furthermore, since the sound absorbing material 1 of the present embodiment is manufactured separately from the intake pipe (component to be countermeasure) 5, the long intake pipe 5 is not required at the time of molding and the like, so that it can be handled easily. You can

According to the mounting method of the sound absorbing material 1 of the present embodiment, the sound absorbing material 1 is mounted so as to easily and surely cover the predetermined portion of the intake pipe 5 formed in a long and complicated curved state. be able to. In the present embodiment, the locking portions 12 are locked by the clips 3, but an adhesive tape is used as another locking tool, or the locking portions 2 are locked by thermocompression bonding. You may do it.

Further, the sound absorbing material 1 of the present embodiment is formed of urethane foam, but it can be formed by using, for example, foam rubber, melamine foam or the like as a sound absorbing flexible material instead of the urethane foam. The sound absorbing material 1 of the present embodiment is
One slit 11a extending axially from one end to the other
Although the main body 11 is configured to be divided at one location in the circumferential direction by the two slits 61a extending in the axial direction from one end to the other end, like the sound absorbing material 6 shown in FIG.
By providing 61b, the body 61 can be divided into two parts. In this case, a pair of engaging portions 62 facing each other are provided on both side portions of the slits 61a and 61b of the body portion 61. The sound absorbing material 6 can be preferably used when there is no space for winding the integrated material.

Further, as shown in FIG. 5, the sound absorbing material 7 is substantially L
In the case of being bent in a letter shape, in addition to the slit 71a formed on the inner side of the bend of the main body 71, the slit 7a extending from one end to the bent portion on the outer side of the bend of the main body 71 in the axial direction.
By forming 1b, only one end side portion may be divided into two. A pair of locking portions 72 facing each other is also provided on both sides of the slit 71b. In this case, the provision of the slit 71b facilitates the expansion of the slit 71a portion of the main body 71, so that the sound absorbing material 7 can be attached more easily.

[0016]

According to the sound absorbing material of the present invention, it is formed in a cylindrical shape having an inner peripheral surface that matches the outer peripheral surface of the intake pipe to be attached, and extends in the axial direction from one end to the other end in the circumferential direction. A main body having at least one slit that divides one location, and at least a pair of locking portions provided on opposite sides of the slit of the main body so as to face each other, and the whole is integrally formed of a sound absorbing soft material. Since it is composed of the molded body described above, it does not require a large mounting space and can be mounted so as to surely cover a predetermined portion of the intake pipe.

Therefore, it is possible to mount the portion of the intake pipe, which is the source of the intake noise, so as to cover it efficiently and effectively, and it is possible to take measures against the intake noise at low cost. Furthermore, since it is easy to partially change the thickness of the main body, it is possible to effectively take measures against intake noise. Further, in the case where the intake pipe is provided with various additives, it is also easy to attach the cutout portion only to that portion.

According to the method for mounting the sound absorbing material of the present invention, the slit portion is circumferentially opened by the elastic deformation of the main body portion and is laterally attached to the outer peripheral surface of the intake pipe to form a main body. Since the locking portions that are opposed to each other are locked and attached by elastic recovery of the portions, the sound absorbing material can be attached so as to easily and surely cover the predetermined portion of the intake pipe.

[Brief description of the drawings]

FIG. 1 is a plan view showing a state in which a sound absorbing material according to an embodiment of the present invention is attached to a part of an intake pipe.

FIG. 2 is a sectional view of a portion corresponding to line II-II in FIG.

FIG. 3 is a front view showing a state in which a plurality of sound absorbing materials according to the embodiment of the present invention are attached to an intake pipe.

FIG. 4 is a perspective view of a sound absorbing material according to another embodiment of the present invention.

FIG. 5 is a perspective view of a sound absorbing material according to another embodiment of the present invention.

[Explanation of symbols]

1, 1A, 1B, 1C, 6, 7 ... Sound absorbing material 11, 6
1, 71 ... Main body 11a, 61a, 61b, 71a, 71b ... Slit 12, 62, 72 ... Locking portion 3 ... Clip 5 ... Intake pipe

Claims (2)

[Claims] 1. A sound-absorbing material mounted to cover an outer peripheral surface of an intake pipe of an internal combustion engine, the sound absorbing member being formed in a tubular shape having an inner peripheral surface matching the outer peripheral surface of the intake pipe to be mounted, and from one end to the other. A main body having at least one slit extending in the axial direction toward the end and dividing at one position in the circumferential direction, and at least a pair of locking portions provided on both sides of the slit of the main body so as to face each other. A sound absorbing material for an intake pipe of an internal combustion engine, comprising: a molded body integrally formed of a sound absorbing flexible material. 2. A main body which is formed in a tubular shape having an inner peripheral surface corresponding to the outer peripheral surface of an intake pipe to be attached and which has a slit extending axially from one end to the other end and dividing one position in the circumferential direction. And a pair of locking portions provided on opposite sides of the slit of the main body so as to face each other, and the entire body is made of a molded body integrally formed of a sound absorbing soft material. The material is laterally attached to the outer peripheral surface of the intake pipe in a state where the slit portion is expanded in the circumferential direction through elastic deformation of the main body portion, and the locking members are opposed to each other by elastic return of the main body portion. A method for mounting a sound absorbing material for an intake pipe of an internal combustion engine, characterized in that the parts are locked and mounted.