JP2008261310A - Intake noise muffler device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake noise muffler device enabling preassembly of a resonator and a side branch and mounting them on an intake pipe at one time, and reduction of cost in tuning work. <P>SOLUTION: This intake noise muffler device 10 is provided with: an intake duct 11 of the internal combustion engine; a box shape resonator 20 connected to an opening part 11b provided at an appropriate position of the intake duct 11 by a communication pipe 215 formed as one body; and the bottomed tube shape side branch 30 communicating to the intake duct 11 at an opening end and projecting to an inside of the box body of the resonator 20 at another end, and also is provided with: a communication part 215a between the intake duct 11 and the resonator 20 in the communication pipe 215 of the resonator 20; and an attachment part 215b attaching the side branch 30 in such a manner that a bottom part thereof projects into the box body of the resonator 20. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a silencer for an intake sound in an intake duct of an internal combustion engine, and more particularly to a silencer in which a side branch is housed in a resonator communicating with an intake duct.

Conventionally, an intake duct that introduces air from a throttle body into a cylinder of an internal combustion engine, as shown in FIG. 11, includes an intake duct 11 having the intake port 11a between a throttle body 14 and a front intake port 11a. The air cleaner 13 is connected to the intake duct 11, and the air cleaner hose 12 is connected to the air cleaner 13 and the throttle body 14.
A box-like resonator 80 that resonates the low frequency range of the intake sound and silences is provided at a proper position between the suction port 11a at the tip of the intake duct 11 and the air cleaner 13, while the air cleaner 13 and the throttle body 14 are silenced. A bottomed cylindrical side branch 90 that resonates and silences the high-frequency region of the intake sound is provided at a proper position between the air cleaner hose 12 and the intake cleaner to reduce the intake sound.

When the resonator and the side branch are arranged at different positions in the intake duct, there is a problem that the capacity of the resonator and its mounting position are limited in order to secure a gap with peripheral parts, particularly in a narrow engine room of the vehicle.
In order to solve this problem, Patent Document 1 discloses a noise absorbing device for an intake duct in which an intake duct and a resonator are connected by a connecting pipe, and a cylindrical side branch having a bottom that opens to the intake duct is inserted into the resonator. Has been.
Japanese Utility Model Publication No. 6-53756

  However, in the noise absorption device for an intake duct shown in Patent Document 1, the connecting pipe 3 and the side branch 4 are arranged at different positions in the resonator 5, so that the size of the resonator 5 cannot be reduced and the assembly place However, there is a problem that the sealing material for the connecting pipe 3 and the side branch 4 is required, and the number of assembling steps and the number of parts are not reduced.

  Further, the resonator and the side branch are required to have different volumes, sizes, etc. depending on the displacement of the internal combustion engine, the cylinder type, the type of the reduction gear connected thereto, and the like. Therefore, a so-called tuning operation for determining the final shape is performed while experimenting with various volumes and sizes. However, there is a problem in that the cost of trial manufacture of the experimental product and the number of tuning operations are increased, and the development cost increases.

  Therefore, in order to solve this problem, the present invention has a resonator and a side branch assembled in advance and can be attached to the intake pipe at a time, and can reduce the cost during tuning work. The purpose is to provide.

  According to a first aspect of the present invention, there is provided an air intake silencer that is integrally formed with an intake duct of an internal combustion engine and an opening provided between the opening at one end and the opening at the other end of the intake duct. Silencer of intake sound, comprising: a box-like resonator connected by a connected communication pipe; and a bottomed cylindrical side branch with an open end communicating with the intake duct and the other end projecting into the box of the resonator In the apparatus, the communication pipe of the resonator includes a communication portion between the intake duct and the resonator, and an attachment portion for attaching the side branch so that a bottom portion of the side branch protrudes into a box of the resonator. To do.

Therefore, a side branch can be installed in the communication pipe of the resonator in advance, and the resonator including this side branch can be handled like a single part and attached to the intake pipe, making assembly easier and reducing the number of assembly steps. it can.
Furthermore, the communication pipe of the resonator may be set while ensuring the size of the communication portion and the side branch, and the size of the box can be set relatively freely, so that the degree of freedom in arranging the resonator is improved.

Further, the silencer of the intake sound according to claim 2 according to the present invention is the silencer of intake sound according to claim 1, wherein the resonator body is provided with an upper body portion provided with the communication pipe, It is characterized by comprising a box-like lower body part that is hermetically attached to the lower part of the upper body part.
Therefore, because the resonator is divided into upper and lower parts, it is possible to prepare a mold that has a different volume only for the lower body of the resonator for each displacement and type of the internal combustion engine, and to manufacture prototypes corresponding to specification changes at low cost. The cost of work can be reduced.

According to a third aspect of the present invention, there is provided an intake sound silencer according to the first or second aspect, wherein the attachment portion is configured to allow the side branch to be replaced. Means are provided.
Therefore, since the side branches having different lengths are prepared and can be easily exchanged, the number of tuning steps and the period can be reduced.

According to a fourth aspect of the present invention, there is provided an intake sound silencer according to any one of the first to third aspects, wherein the resonator is attached to the side branch. The section is provided with adjusting means for adjusting the axial mounting position of the side branch.
Therefore, in the tuning stage of the side branch by the adjusting means, it is possible to easily adjust the protruding length from the connection portion of the intake pipe into the resonator, and to reduce the tuning man-hour and the period.

According to a fifth aspect of the present invention, there is provided an air intake silencer according to any one of claims 1 to 4, wherein an opening of the air intake duct is the resonator. The communication pipe is formed larger than the communication pipe, a sealing material is provided outside the communication pipe, and the communication pipe is inserted into the opening portion of the intake duct and sealed.
Therefore, it is not necessary to provide the sealing material in each of the resonator and the side branch, and it is only necessary to provide the sealing material only in the communication pipe of the resonator.

According to the intake sound silencer of the present invention, since the side branch protrudes into the resonator and the side branch is mounted in the communication pipe of the resonator, the degree of freedom of the resonator is increased, and one part is provided. Thus, it is possible to reduce the number of parts and the number of assembly steps.
Further, since the resonator has a vertically divided structure and the side branch can be easily replaced or adjusted, the number of tuning steps and the period can be reduced.
Furthermore, since the upper body part of the resonator can be shared, the development cost can be reduced.

Next, an embodiment of a silencer for an intake sound according to the present invention will be described with reference to the drawings. The intake air silencer of the present embodiment is provided in an engine room of a vehicle.
Here, FIG. 1 is a conceptual diagram showing the entire intake duct of the internal combustion engine. 2 and 3 schematically show the silencer, FIG. 2 is a plan sectional view of the silencer, and FIG. 3 is a side sectional view of the silencer. 6 to 8 show three views of the muffler actually implemented, and the same reference numerals as those in the schematic diagram are attached and detailed description thereof is omitted.

  The configuration of the silencer for the intake sound according to the first embodiment of the present invention will be described. As shown in FIG. 1, the intake system of the internal combustion engine includes a throttle body 14 connected to a cylinder, an air cleaner 13, an air cleaner hose 12 as a second intake duct connecting the throttle body 14 and the air cleaner 13, The silencer 10 according to the present invention is provided at a proper position of the intake duct 11. The silencer 10 of the present invention is provided with an intake duct 11 as a first intake duct having a suction port 11 a at the tip and connected to the air cleaner 13 at the other end. Is connected to the opening 11b.

  As shown in the cross-sectional views of FIGS. 2 and 3 and FIGS. 6 to 8, the silencer 10 includes a box-shaped resonator 20 that resonates the low frequency region of the intake sound and silences the sound, and the resonator 20 has a box body. And a bottomed cylindrical side branch 30 that resonates in the high-frequency region of the intake sound and is mounted so that the bottom portion protrudes.

The resonator 20 is a box having a much larger volume than the side branch 30, and is composed of an upper body portion 21 and a box-like lower body portion 25 that is hermetically attached to the lower portion of the upper body portion 21. ing.
The upper body portion 21 is formed in a box-like lid shape from an upper surface portion 211 and four side wall surfaces 213 extending downward from the periphery of the upper surface portion 211.
A communication pipe 215 that is inserted into an opening 11 b provided in the intake duct 11 and communicates with the intake duct 11 is provided at a corner portion constituted by the upper surface portion 211 and one side wall 213 with respect to the upper surface portion 211. And inclined.

  As shown in the cross-sectional view of FIG. 4, the communication pipe 215 is integrally formed of, for example, a synthetic resin material, and has a communication portion 215 a communicating with the intake duct 11, a slightly smaller diameter than the communication portion 215 a, and the side branch 30. And a mounting portion 215b into which a circular arc is inserted, and a flange portion 215c connecting the two arcs with a tangent line, and a substantially triangular portion surrounded by the arcs with the flange portion 215c is closed to form a bottom portion. Part 215d. In the closed portion 215d, the intake duct 11 and the resonator 20 are not in communication.

  A seal formed by applying an adhesive to a sponge-like foam material that seals the opening 11b and the communication tube 215 when the communication tube 215 is inserted into the opening 11b, around the outer periphery of the communication tube 215. The member 40 is wound.

  The lower body portion 25 of the resonator 20 has a box shape with a bottomed rectangular tube, and is attached in an airtight manner by adhering a flange 251 provided at the upper portion to a flange 213a provided at the lower end of the side wall 213 of the upper body portion 21. Yes. And the volume of lower body part 25 is changed by making the adhesion part of flanges 213a and 251 the same shape in upper body part 21 and lower body part 25, and changing only the depth of the box of lower body part 25, Since the tuning work corresponding to the specification change of the internal combustion engine can be performed, the production cost of the prototype at the time of tuning is reduced, and the cost of the final product can be reduced because the mold of the upper body portion 21 can be used as it is. In addition, the development cost can be reduced by sharing the parts of the upper body 21 even in different vehicle types.

  The side branch 30 is a bottomed cylinder having an outer diameter substantially the same as the inner diameter of the mounting portion 215b, and the bottom portion of the side branch 30 is substantially at the center of the resonator 20 in plan view so that the opening at the tip thereof opens into the intake duct 11. It is inserted and attached to the attachment part 215b so that it may be located. Then, the joint surface between the side branch 30 and the upper surface portion 211 is fixed to the upper surface portion 211 by the rivet 39. Thereby, it can replace | exchange for the side branch from which length differs according to the specification change of a vehicle type or an internal combustion engine.

The tuning operation of the silencer 10 configured as described above will be described. First, the piping shape of the intake duct 11 is determined from the air cleaner 13 disposed in the engine room, and the mounting position of the silencer 10 provided in the middle thereof is determined in consideration of the size and shape of the surrounding space.
Then, in light of the simulation and previous experience, the size (volume) of the resonator 20 and the diameter and length of the side branch 30 are tentatively determined to produce a prototype. At this time, the size and shape of the upper body portion 21 of the resonator 20 and the outer dimensions of the side branch 30 are determined (this will be referred to as a primary prototype).

  Noise measurement is performed using this primary prototype, and several types of the resonator body 20 having different sizes of the lower body portion 25 (the upper shape is the same and the depth is different) are prototyped. A plurality of types of side branches 30 having different lengths are also prototyped (this is referred to as a secondary prototype). Then, various combinations of the lengths of the lower body portion 25 and the side branch 30 of these secondary prototypes are used to measure noise, and the combination having the lowest noise level is selected to determine the shape of the lower body portion 25 and the length of the side branch 30. Determine the final product.

  That is, only one type of primary prototype is manufactured for the upper body portion 21 of the resonator 20, and a plurality of lower body portions 25 and side branches 30 are manufactured as secondary prototypes, so that the length of the side branch 30 and the lower body portion 25 Since the tuning work can be done by combining the two, the cost of trial production can be reduced.

In order to assemble the lower body portion 25 and the side branch 30 of the resonator 20 determined as described above to the upper body portion 21, the bottom portion of the side branch 30 has a predetermined length on the attachment portion 215b of the upper body portion 21. It is inserted so as to protrude into the box, and is fixed by a rivet 39.
And the lower body part 25 is adhere | attached on the lower surface of the flange of the upper body part 21, and it connects airtightly, and it completes as the silencer 10. FIG.

The silencer 10 is connected to the intake duct 11 by winding the seal member 40 around the entire circumference of the communication pipe 215 and inserting the communication pipe 215 into the opening 11b of the intake duct 11 while compressing the seal member 40. To do. Thereafter, the sound deadening device 10 is fixed in the surrounding area by an attachment portion (not shown) provided in the resonator 20 and the silencer 10 is attached in the engine room.
Therefore, since the resonator 20 and the side branch 30 can be attached together in the engine room, the mounting workability is improved.

  Next, the configuration of an intake sound silencer according to a second embodiment of the present invention will be described. As shown in FIGS. 9 and 10, the silencer 10 </ b> A of the second embodiment is illustrated on the joint surface with the upper surface portion 211 of the side branch 30 </ b> A with respect to the silencer 10 of the first embodiment. A plurality of mounting holes 351A as shown in FIG. 10 are provided, and the adjusting means 35A for adjusting the mounting position of the side branch 30A at the time of tuning can be changed by changing the axial mounting position of the side branch 30A with respect to the intake duct 11. It is composed.

  According to the silencer 10A of the second embodiment, the side branch 30A may be a primary prototype of one side branch 30A provided with a plurality of mounting holes 351A as adjustment means 35A. Prototype costs can be reduced.

  According to the silencer 10, 10 </ b> A configured as described above, the intake sound generated by the intake air sucked from the intake port 11 a of the intake duct 11 cancels out the low-frequency region to the wave resonated inside the resonator 20. Then, the high frequency region is canceled by the waves reflected at the bottoms of the side branches 30 and 30A, respectively reduced in sound, and the intake sound is reduced.

  Thus, according to the silencer 10, 10A of the present invention, it is possible to reduce the number and production costs of prototypes during tuning work, and only change the attachment position of the side branch 30A and the lower body portion 25 of the resonator 20. Therefore, the cost and time of the tuning work can be reduced, and the man-hours for mounting the silencer 10, 10A can be reduced.

In addition, this invention is not limited to the thing of the said embodiment, A various change is possible in the range which does not deviate from the meaning.
For example, in the above-described embodiment, the side branch is described as having a bottomed cylindrical shape, but may be a bottomed rectangular tube shape or a triangular tube shape.

  The present invention relates to an intake duct of an internal combustion engine, and a box-shaped resonator connected to an opening provided between an opening at one end and an opening at the other end of the intake duct by a communication pipe integrally formed. And an intake sound silencer having an open end in communication with the intake duct and a bottomed cylindrical side branch projecting into the box of the resonator at the other end, the intake air in the communication pipe of the resonator Since the silencer is provided with a communicating portion between the duct and the resonator and a mounting portion for attaching the side branch so that the bottom portion protrudes into the box of the resonator, the resonator including the side branch is a single component. Can be attached to the intake pipe, making it easy to assemble, reducing the number of assembly steps, and connecting the resonator's communication pipe between the communication section and the side branch. It may be set to ensure the of can, because you can set the size of the box relatively freely, it becomes possible to improve the degree of freedom of the arrangement of the resonator.

It is the conceptual diagram which showed the whole intake duct of the internal combustion engine which concerns on 1st embodiment of this invention. It is a plane sectional view of the silencer concerning a first embodiment of the present invention. It is side surface sectional drawing of the silencer which concerns on 1st embodiment of this invention. It is sectional drawing which follows the IV-IV line of FIG. It is a perspective view of the side branch which concerns on 1st embodiment of this invention. It is a side view of the silencer which actually implements the present invention. It is a top view of the silencer which actually implements the present invention. It is a front view of the silencer which actually implements the present invention. It is a plane sectional view of the silencer concerning a second embodiment of the present invention. It is a perspective view of the side branch which concerns on 2nd embodiment of this invention. It is the conceptual diagram which showed the whole intake duct of the conventional internal combustion engine.

Explanation of symbols

10, 10A Silencer 11 Intake duct 11a Inlet 11b Opening 12 Air cleaner hose 13 Air cleaner 14 Throttle body 20 Resonator 21 Upper body 211 Upper surface 213 Side wall 215 Communication pipe 215a Communication part 215b Attachment part 215c Flange part 215d Closure part 25 Lower body 30, 30A Side branch 35, 35A Adjusting means 351, 351A Mounting hole 39 Rivet 40 Seal member

Claims (5)

An intake duct of an internal combustion engine, a box-shaped resonator connected to an opening provided between an opening at one end and the opening at the other end of the intake duct by an integrally formed communication pipe, and an opening end In the silencer of the intake sound provided with a bottomed cylindrical side branch that communicates with the intake duct and has the other end protruding into the box of the resonator,
An intake noise comprising: a communicating portion between the intake duct and the resonator; and a mounting portion for attaching the side branch so that a bottom portion protrudes into a box of the resonator in the communicating pipe of the resonator. Silencer. The silencer of the intake sound according to claim 1,
An intake sound silencer comprising: a box body of the resonator including a body part having the communication pipe and a box-like body part hermetically attached to a lower part of the body part. In the silencer of the intake sound according to claim 1 or 2,
The intake sound muffling device, wherein the attachment portion includes a fixing unit that allows the side branch to be replaced. In the silencer of the intake sound according to any one of claims 1 to 3,
An intake sound muffling device, characterized in that the side branch is provided with adjusting means for adjusting an axial mounting position of the side branch at a mounting portion of the resonator. In the silencer of the intake sound according to any one of claims 1 to 4,
The opening of the intake duct is formed larger than the communication pipe of the resonator, a sealing material is provided outside the communication pipe, and the communication pipe is inserted into the opening of the intake duct and sealed. Inspiratory sound silencer.

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