JPH084612A - Intake resonator of internal combustion engine - Google Patents

Abstract

PURPOSE:To improve workability of assembling, and also to secure a sufficient seal area and stiffness of a joint part. CONSTITUTION:In an intake resonator wherein a resonator main ] body part 1 is installed approximately coaxially to an intake duct and on its outer peripheral side, the resonator main body part 1 is integrally formed by one side first intake duct part 2 is the upstream or the downstream, and a second intake duct part 4 positioned in the resonator main body part 1 is integrally formed by one side third intake duct part 5 in the upstream or the downstream of the resonator main body part 1, and ends 1a, 1b on both sides of the resonator main body part 1 are fitted to the second intake duct part 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intake resonator for attenuating and reducing intake noise of an internal combustion engine by resonance absorption of sound energy. More specifically, the resonator main body is installed coaxially with an intake duct on the outer peripheral side thereof. Regarding the intake resonator.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional intake resonator for an internal combustion engine.
Referring to FIG. 3, the illustrated intake resonator is configured by joining a left side resonator portion A1 and a right side resonator portion A2, which are formed by injection molding, to each other. The left resonator portion A1 is a straight tubular intake duct portion B1.
And a cylindrical resonator body C1 that surrounds the same coaxially, and the right resonator A2 has a straight tubular intake duct B2 and a cylindrical resonator body C2 that coaxially surrounds the same. There is. Here, the intake duct portion B1 and the intake duct portion B2 are joined by welding in a state where the end portions are butted against each other via the flanges D1 and D2, and the resonator main body portion C1 and the resonator main body portion C2 have the same flange E1. The ends are abutted against each other via E2 and are joined by welding. The left resonator part A1 and the right resonator part A2 are conventionally formed by injection molding, and therefore they are straight pipes. Therefore, it is necessary to connect a curved pipe duct to them in order to mount them on a vehicle. In addition, the wall thickness was large because the molten material was filled in the entire mold.

[0003]

In the conventional resonator, the end portions of the intake duct portion B1 and the intake duct portion B2 and the end portions of the resonator main body portion C1 and the resonator main body portion C2 are abutted against each other and joined together. , Flange D to secure sufficient seal area and joint rigidity
1 and D2 and the flanges E1 and E2 have to be made large to perform reliable welding over the entire circumference thereof, so that there is a problem in that workability of assembly is poor.

[0004]

In order to solve the above problems, the intake resonator for an internal combustion engine according to claim 1 of the present invention comprises:
An intake resonator in which a resonator main body is installed substantially coaxially with the intake duct on the outer peripheral side thereof, wherein the resonator main body is integrally formed with a first intake duct part on one of the upstream side and the downstream side, and the resonator main body is also provided. A second air intake duct portion located inside the third air intake duct portion is integrally formed with a third air intake duct portion on the other side upstream and downstream of the resonator main body portion, and both end portions of the resonator main body portion are provided with the second
It is characterized in that it is fitted in the intake duct portion. The intake resonator for an internal combustion engine according to a second aspect of the present invention is the intake resonator of the first aspect, wherein a bulge is formed at the end portions on both sides of the resonator main body portion and the second intake duct portion where the end portions are fitted. It is characterized by Further, the intake resonator of the internal combustion engine according to claim 3 is the same as that according to claim 1.
The O-ring is interposed between the end portions on both sides of the resonator main body and the portion of the second intake duct portion to which the end portions fit. Furthermore, the intake resonator for an internal combustion engine according to claim 4 is the second or third intake duct according to any one of claims 1 to 3, which is integrally formed with a first intake duct portion forming the resonator main body. It is characterized in that the part and the part are joined by a method such as rivet and tightening by bolt fitting. In addition, the intake resonator for an internal combustion engine according to claim 5 is the intake resonator according to any one of claims 1 to 4, wherein the resonator main body portion and the first intake duct portion, and the second intake duct portion and the third intake duct portion. Are characterized by being integrally molded by blow molding.

[0005]

According to the first aspect of the invention, the resonator is assembled by fitting the second intake duct portion, which is integral with the third intake duct portion, to both ends of the resonator main body portion, which is integral with the first intake duct portion. By appropriately setting the length of the fitting portion, it is possible to easily secure a sufficient sealing area and rigidity of the joint portion. In the invention of claim 2, since the bulge is formed in the fitting portion, the sealing property and the rigidity of the fitting portion are further improved. According to the third aspect of the invention, since the fitting portion is provided with the O-ring, the sealing property is improved.
In the invention of claim 4, a higher joining force can be obtained by performing the connection by rivets or the like. According to the fifth aspect of the invention, since the constituent members of the resonator including the intake duct are formed by blow molding, the intake duct can be formed in a curved tube shape, and the shape of the resonator main body is formed into an optimum shape for absorbing intake sound. In addition, the thickness of each part can be reduced.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a first embodiment of the present invention will be described with reference to FIG. The illustrated intake resonator is arranged substantially coaxially within the resonator main body 1 with a first part 3 formed by integrally forming a resonator main body 1 and a first intake duct portion 2 upstream thereof by blow molding. Second intake duct part 4
And the third intake duct portion 5 on the downstream side of the resonator body 1
And a second portion 6 integrally formed by blow molding in the same manner.
It consists of

Here, the second intake duct portion 4 in the resonator main body 1 has a substantially straight tube shape, and a through hole 8 communicating with the internal space 7 of the resonator main body 1 is formed in a part thereof. There is. Intake noise can be effectively reduced by appropriately selecting the volume of the internal space 7 and the diameter and number of the through holes 8.

On the other hand, the first intake duct portion 2 and the third intake duct portion 5 have a curved tubular shape, and their shapes are appropriately set according to the mounting location of the resonator on the vehicle.

The assembly of such a resonator is as follows.
The second intake duct portion 4 of the second portion 6 is inserted into the resonator main body portion 1 of the first portion 3 and fitted at both ends 1a and 1b of the resonator main body portion 1, and then these fitting portions are bulged. It is performed by forming 9 and 10, respectively.

That is, in the present embodiment, the resonator is assembled by fitting the second intake duct portion 4 at both ends 1a and 1b of the resonator body 1 without requiring welding or the like. Therefore, the work is easy, and by setting the length of these fitting parts appropriately, it is possible to easily secure a sufficient sealing area and rigidity of the joint part. By forming 9 and 10, the sealing property and the rigidity of the fitting portion are further improved.

Further, since the first portion 3 and the second portion 6 are both formed by blow molding, the degree of freedom of these shapes is increased, and the first intake duct portion 2 and the third intake duct portion 5 are formed. As described above, the resonator body 1 can be formed in a curved tube shape, and the shape of the resonator main body 1 can be formed in an optimum shape for absorbing intake sound, and the thickness of each portion can be minimized. Further, it is not necessary to separately provide a curved pipe for mounting on a vehicle. Therefore, a resonator having an excellent effect of reducing intake noise can be easily manufactured, and the equipment cost and the material cost can be low, and the product unit price can be reduced.

Next, a second embodiment of the present invention will be described with reference to FIG. Similar to the first embodiment, the resonator of this embodiment has a resonator main body 11 and a first air intake duct portion 12 upstream thereof which are integrally formed by blow molding, and a resonator main body 11. The second intake duct portion 14 and the resonator main body portion 1 which are arranged substantially coaxially therein.
1 is composed of a third intake duct portion 15 on the downstream side of 1 and a second portion 16 which is also integrally formed by blow molding. The second intake duct portion 14 has a resonator main body portion 11
A through hole 18 communicating with the internal space 17 is formed.

Also, assembling such a resonator is
The second intake duct portion 14 of the second portion 16 is connected to the first portion 13
It is performed by inserting it into the resonator main body 11 and fitting at both ends 11a and 11b of the resonator main body 11. However, in this embodiment, in order to secure the sealing property of the fitting portion, Instead of the bulges 9 and 10 of the first embodiment, O-rings 19 and 19 are interposed between the two end portions 11a and 11b of the resonator body 11 and the second intake duct portion 14 that faces them, and the joint strength is further increased. In order to ensure the above, the rivets 20, 20 fix the end portion 11a of the resonator main body portion 11 on the first intake duct portion 12 side and the end portion 14a of the second intake duct portion 14 into which the end portion 11a fits. There is.

[0014]

According to the invention of claim 1, the resonator is the third
Since the second intake duct part integrated with the intake duct part is fitted to both ends of the resonator main body part integrated with the first intake duct part, it can be assembled by butt welding of the flange. Compared with this, the assembling work can be performed easily and quickly, and the workability is improved. Further, by appropriately setting the length of the fitting portion, it is possible to easily secure a sufficient sealing area and rigidity of the joint portion,
The resonator performance is improved. In the invention of claim 2, since the bulge is formed in the fitting portion, the sealing performance and the rigidity of the fitting portion are further improved, so that the resonator performance can be reliably maintained. According to the invention of claim 3, the sealability by the O-ring is further improved. According to the fourth aspect of the invention, the resonator performance can be reliably maintained by improving the coupling force by the rivet or the like. In the invention of claim 5, since the constituent members of the resonator including the intake duct are formed by blow molding,
The intake duct can be formed into a curved pipe, which eliminates the need to connect a curved pipe separately, which reduces equipment costs, and makes it easy to manufacture a resonator with excellent intake noise reduction effects and at a low material cost. Has the advantage

[Brief description of drawings]

FIG. 1 is a sectional view of an intake resonator of an internal combustion engine according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an intake resonator of an internal combustion engine according to a second embodiment of the present invention.

FIG. 3 is a sectional view of an intake resonator of a conventional internal combustion engine.

[Explanation of reference numerals] 1,11 Resonator body part 1a, 1b, 11a, 11b End part 2,12 First intake duct part 4,14 Second intake duct part 5,15 Third intake duct part 9,10 Bulge 19 O Ring 20 rivets

Claims (5)

[Claims] 1. An intake resonator in which a resonator main body is installed substantially coaxially with an intake duct on the outer peripheral side thereof, and the resonator main body is integrally formed with a first intake duct part on one of the upstream side and the downstream side thereof. At the same time, the second intake duct portion located in the resonator main body is integrally formed with the third intake duct portion on the other side upstream and downstream of the resonator main body, and the ends on both sides of the resonator main body are formed. An intake resonator for an internal combustion engine, wherein the intake resonator is fitted in the second intake duct portion. 2. An internal combustion engine according to claim 1, wherein a bulge is formed at the end portions on both sides of the resonator main body portion and the portion of the second intake duct portion to which the end portions fit. Intake resonator. 3. An O-ring is interposed between the end portions on both sides of the resonator main body portion and the portion of the second intake duct portion to which the end portions are fitted. An intake resonator for an internal combustion engine according to item 1. 4. The first intake duct portion forming the resonator body and the integrally formed second and third intake duct portions are joined together by a method such as rivet fastening or bolt fastening. Claim 1 characterized by the above.
An intake resonator for an internal combustion engine according to any one of 3 to 3. 5. The resonator main body portion and the first intake duct portion, and the second intake duct portion and the third intake duct portion are integrally formed by blow molding, respectively. An intake resonator for an internal combustion engine according to any one of to 4.