JP2006183565A - Resonator and intake device with resonator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To extend length of a communication pipe without receiving limitation due to height of a welding joining surface in a muffling chamber of a resonator. <P>SOLUTION: This resonator includes a first chamber wall part 8 formed on a duct upper part wall 2 defining an air flow passage 5 as one unit, and a second chamber wall part 10 joined to the first chamber wall part 8 by welding as one unit to form a box shape together with the first chamber wall part 8 and defining the muffling chamber 9 adjoining the air flow passage 5, and includes a first pipe wall part 11 formed on a duct upper part wall 2 with which the first chamber wall part 8 is formed as one unit, and a second pipe wall part 14 formed on the second chamber wall part 10 as one unit via a connecting part 12 and joined on the first pipe wall part 11 as one unit by welding to form a pipe shape together with the first pipe wall part 11 and defining the communication passage 13 keeping communication between the air flow passage 5 and the muffling chamber 9 in the muffling chamber 9. A welding joining surface of the first chamber wall part 8 and the second chamber wall part 10, and a welding joining surface of the first pipe wall part 11 and the second pipe wall part 14 are on a same surface P. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resonator and an intake device with a resonator, and more particularly, to be integrated with an intake device such as an air intake duct or an air cleaner connected to an internal combustion engine such as a vehicle, and to eliminate noise generated or propagated in an intake air passage or the like. The present invention relates to a resonator and a suction device with a resonator.

  In general, an intake device such as an air intake duct or an air cleaner connected to an internal combustion engine such as an automobile has a resonator for eliminating noise generated or propagated in an air passage such as an air intake duct or an air chamber such as an air cleaner. It is provided integrally.

  As such a resonator, for example, as shown in FIG. 8, a resonance silencer chamber 82 is provided outside the intake duct 81, and the intake duct 81 and the resonance silencer chamber 82 communicate with each other through a communication path 83. A resonator is known (see Patent Document 1).

In such a resonator, generally, the chamber wall portion that defines the resonance silencer chamber 82 is divided into a first chamber wall portion 84 and a second chamber wall portion 85, and It is manufactured by integrally joining the first flange portion 87 and the second flange portion 88 of the second chamber wall portion 85 by hot plate welding. In addition, the communication pipe 86 that defines the communication path 83 is generally integrally formed with the first chamber wall 84 and the intake duct 81.
Japanese Patent Laid-Open No. 6-200731 (FIG. 12)

  By the way, the silencing frequency to be resonated and silenced in this type of resonator is determined by a specific calculation formula based on Helmholtz's resonance theory, etc., using the volume of the resonance silencing chamber 82, the length and cross-sectional area of the communication path 83 as parameters, and the like. . According to this, for example, when it is desired to set the silencing frequency low, it is necessary to increase the volume of the resonance silencing chamber 82 or increase the length of the communication path 83. However, increasing the volume of the resonance silencer chamber 82 is limited because it is restricted by space in the engine room. For this reason, it is required to set the length of the communication path 83 long in the resonance silencer chamber 82.

  However, lengthening the communication pipe 86 to lengthen the communication path 83 is also limited because of restrictions on the manufacture of the resonator. That is, as can be seen from FIG. 8, if the communication pipe 86 is extended below the welding joint surface 89 between the first and second flange portions 87 and 88, the first and second flange portions 87 and 88 are connected to each other. When the hot plate is welded, the communication pipe 86 becomes an obstacle, and the hot plate cannot be applied to the flange portion.

  Therefore, as shown in FIG. 9, a means for increasing the length of the communication pipe 90 can be considered by forming the communication pipe 90 bent halfway so as not to hit the hot plate during hot plate welding.

  However, it is difficult to integrally form the communication pipe 90 bent in the middle in this way, for example, in the first chamber wall portion 84 defining the muffler chamber 82 or the intake duct 81 due to restrictions on the mold structure. is there. For this reason, as shown in FIG. 9, only the bent communication pipe 90 must be separately formed and then connected to the intake duct 91. As a result, the parts cost and mold cost increase due to an increase in the number of parts, the assembly process of the communication pipe 90 increases, the workability deteriorates and the productivity decreases, or the assembly of the communication pipe 90 is forgotten. There is an inconvenience.

  On the other hand, in FIG. 9, the welding joint surfaces 97 of the first and second chamber walls 93 and 94 defining the resonance silencer chamber 92 between the first and second flange portions 95 and 96 are temporarily shifted upward in FIG. If possible, the communication pipe 90 can be elongated by extending upward without bending the communication pipe 90 in the middle.

  However, when the hot plate is welded, the first and second flange portions 95 and 96 are sandwiched by the welding jig while holding the side surfaces of the first and second chamber wall portions 93 and 94 with the welding jig. Therefore, a grip margin as a contact area of the welding jig is required on the side surfaces of the first and second chamber wall portions 93 and 94. For this reason, the welding joint surface 97 can be shifted upward only within a range in which the allowance can be ensured, and there is still a limit.

  The present invention has been made in view of the above circumstances, and it is possible to communicate without being limited by the height position of the welded joint surface in the silencer chamber of the resonator while eliminating the need to separately form the communication pipe and then assembling it. Increasing the length of the tube is a technical problem to be solved.

  The resonator of the present invention that solves the above problems includes a first chamber wall portion formed integrally with a duct wall defining an air flow path or a chamber wall defining an air chamber, and the first chamber wall portion. A first chamber wall portion which is integrally joined by welding and forms a box shape with the first chamber wall portion to define the air flow path or the muffler chamber adjacent to the air chamber; The first pipe wall part formed integrally with the pipe wall or the chamber wall integrally formed with the chamber wall part, and the first wall part formed integrally with the second chamber wall part via a connecting part. A first passage is integrally joined to the tube wall portion by welding and is formed in a tubular shape together with the first tube wall portion so as to define a communication passage that communicates the air flow path or the air chamber and the muffler chamber in the muffler chamber. Two pipe wall portions, a welding joint surface of the first chamber wall portion and the second chamber wall portion, and the first tube wall portion and the second tube wall portion. Wearing bonding surface and is characterized in that on the same plane.

  In this resonator, the communication pipe that defines the air flow path or the communication path that connects the air chamber and the muffler chamber is divided into a first tube wall portion and a second tube wall portion, and the first tube wall portion is air flow. The pipe wall that defines the passage or the chamber wall that defines the air chamber is integrally formed, while the second pipe wall portion is integrally formed with the second chamber wall portion via the connecting portion. The weld joint surface between the first chamber wall portion and the second chamber wall portion and the weld joint surface between the first tube wall portion and the second tube wall portion are on the same plane.

  For this reason, the first chamber wall portion and the second chamber wall portion are integrally joined by hot plate welding, and at the same time, the first tube wall portion and the second tube wall portion are integrally formed by hot plate welding using the same hot plate. Can be joined. Therefore, the length of the communication path is at least the length of the second tube wall portion without being restricted by the height position of the welded joint surface between the first chamber wall portion and the second chamber wall portion that defines the muffler chamber. It is possible to lengthen the length in the silence room. Therefore, the length of the communication path can be increased without being limited by the height position of the welding joint surface in the noise reduction chamber having a limited volume due to space constraints. In this space, it is possible to provide a resonator that is effective for resonance and noise reduction in a lower frequency region.

  In addition, a peripheral part in which this resonator is provided integrally, a first pipe wall part formed integrally with a pipe wall or a chamber wall in which the first chamber wall part is integrally formed, and a second chamber wall part. By connecting the molded second tube wall portion with the hot plate at the same time when the first chamber wall portion and the second chamber wall portion are welded together, a communication tube can be provided, so the length of the communication tube Therefore, it is not necessary to separately form only the communication pipe bent to lengthen the length and to assemble it later. Therefore, avoiding inconveniences such as an increase in the number of parts increases the cost of parts and molds, or the productivity of the connection pipe is reduced due to an increase in the process of assembling the communication pipe or forgetting to install the communication pipe. be able to.

  Furthermore, the length of the communication pipe can be increased without being restricted by the height position of the welded joint surface. In other words, the welded joint surface is not subject to the restriction of the length of the communication pipe. It means that the height position of can be changed arbitrarily. For this reason, the height position of the welding joint surface can be changed within the range that can secure the gripping allowance of the welding jig during hot plate welding, and the shape and size of the chamber wall that defines the sound deadening chamber can be designed. The degree of freedom can be improved.

  A suction device with a resonator according to the present invention for solving the above-mentioned problems includes a tubular intake duct having a duct wall defining an air flow path or a box-shaped air cleaner having a chamber wall defining an air chamber, and the duct. A first chamber wall portion integrally formed with the wall or the chamber wall; and the air flow path which is integrally joined to the first chamber wall portion by welding and forms a box shape with the first chamber wall portion Or the 2nd chamber wall part which defines the silencing chamber adjacent to the said air chamber, and the 1st tube wall part integrally formed by the said channel wall by which the said 1st chamber wall part was integrally molded, or the said chamber wall And integrally formed with the second chamber wall portion via a connecting portion and integrally joined to the first tube wall portion by welding, forming a tubular shape with the first tube wall portion and the air flow. A second pipe wall portion defining a passage or a communication passage communicating the air chamber and the muffler chamber in the muffler chamber, The welding joint surfaces of the first chamber wall and the second chamber wall and the welding joint surfaces of the first tube wall and the second tube wall are on the same plane. .

  Here, the "intake duct" refers to an air duct provided on the air upstream side of the air cleaner to introduce low temperature outside air into the air cleaner, as well as an air cleaner provided on the air downstream side of the air cleaner and cleaned by the air cleaner. The intake duct (connecting pipe) for supplying the engine to the engine side is also included.

  This intake device with a resonator is an intake duct or an air cleaner in which the resonator of the present invention is integrally provided. For this reason, it becomes possible to provide an intake duct or an air cleaner with a resonator that exhibits all the operational effects of the resonator of the present invention described above.

  Hereinafter, embodiments of the resonator of the present invention and the intake device with a resonator of the present invention will be specifically described.

(Embodiment 1)
The present embodiment shown in FIGS. 1 to 6 is one in which the resonator of the present invention is provided integrally with an intake duct, and the intake device with a resonator of the present invention is applied to an intake duct with a resonator.

  The intake duct 1 is disposed opposite to the duct upper wall portion 2 with a required space between the duct upper wall portion 2 and supplies the horizontally long intake port 3 and low-temperature outside air sucked from the intake port 3 from the connection port 4 to the air cleaner. A duct lower wall portion 6 that defines the air flow path 5 together with the duct upper wall portion 1 is provided, and the opposite end portions of the duct upper wall portion 1 and the duct lower wall portion 6 are joined together by bolting or the like. As a result, a hollow body is formed.

  The intake duct 1 is disposed in a space between a bonnet (not shown) and a radiator upper support (not shown) of the vehicle with the intake port 3 facing the front of the vehicle (left side of FIG. 1, hereinafter the same). The The intake duct 1 is fixed by being bolted to the radiator upper support.

  The resonator 7 according to the present embodiment is integrally provided on the duct upper wall 1 that defines the air flow path 5 of the intake duct 1 together with the duct lower wall 6.

  That is, the resonator 7 includes a first chamber wall portion 8 formed integrally with a duct upper wall portion 1 as a duct wall defining the air flow path 5, and a hot plate welding to the first chamber wall portion 8. It has a second chamber wall portion 10 which is integrally joined and forms a box shape together with the first chamber wall portion 8 to define a resonance silencer chamber 9 adjacent to the air flow path 5. The resonator 7 includes a first pipe wall portion 11 formed integrally with a duct upper wall portion 2 in which a first chamber wall portion 8 is integrally formed, and a second chamber wall portion 10 via a connecting portion 12. The muffler chamber is formed as a single unit and is integrally joined to the first tube wall portion 11 by welding and has a tubular shape with the first tube wall portion 11 to communicate the air flow path 5 and the muffler chamber 9. 9 and a second pipe wall portion 14 defined in the inside.

  And the welding joint surface of the said 1st chamber wall part 8 and the said 2nd chamber wall part 10 and the welding joint surface of the said 1st pipe wall part 11 and the said 2nd pipe wall part 14 are the same surfaces (FIG. 1). P side).

  The first and second chamber wall portions 8 and 10 have first and second flange portions 15 and 16, respectively, and the first and second flange portions 15 and 16 are integrated with each other by hot plate welding. It is joined to. Further, the ceiling portion of the second chamber wall portion 10 is an inclined ceiling portion 17 whose height gradually decreases from one end to the other end (from the rear to the front of the vehicle). This inclined ceiling portion 17 is subjected to space restrictions in the engine room (corresponding to the gap between the bonnet and the radiator upper support becoming narrower toward the front side of the vehicle). It is considered to be a form.

  The connecting portion 12 that connects the second chamber wall portion 10 and the second tube wall portion 14 has a substantially U-shaped cross-sectional shape as shown in FIG. ing. The cross-sectional shape of the connecting portion 12 is substantially U-shaped because the load is supported by a so-called three-point support in order to prevent the connecting portion 12 from being deformed so as to be bent by a load from the hot plate during hot plate welding. It is for improving the rigidity of the connection part 12 by receiving by. Here, the connecting portion 12 has the second chamber wall portion 10 and the second tube wall portion 14 so that the opening area of the opening portion 12a in the substantially U-shaped cross section is equal to the flow path cross-sectional area of the communication passage 13. (The length extending in the vertical direction in FIG. 1, that is, the length in the direction in which the communication path 13 extends) and the like are set. This is to prevent the silencing frequency to be resonated and silenced by the resonator 7 from changing due to the difference between the opening area of the opening 12a and the flow path cross-sectional area of the communication path 13. Moreover, the 1st pipe wall part 11 and the 2nd pipe wall part 14 have comprised the substantially rectangular cross-sectional shape so that the BB line and CC line sectional drawing of FIG. 2 may be shown by FIG. . Similarly, the first chamber wall portion 8 and the second chamber wall portion 10 have a substantially rectangular cross-sectional shape (a cross-sectional shape at a position lower than the lowest position of the inclined ceiling portion 17).

  Therefore, the intake duct 1 with the resonator 7 according to this embodiment has the following configuration.

  That is, the intake duct 1 with the resonator 7 includes a duct upper wall portion 2 and a duct lower wall that is integrally joined to the duct upper wall portion 2 and forms a tubular shape with the duct upper wall portion 2 to define an air flow path 5. Part 6, first chamber wall 8 formed integrally with duct upper wall 2, and integrally joined to first chamber wall 8 by welding to form a box with first chamber wall 8. Connected to the second chamber wall 10 defining the resonance silencer 9 adjacent to the air flow path 5, the first tube wall 11 integrally formed with the duct upper wall 2, and the second chamber wall 10. The air channel 5 and the sound deadening chamber 9 are communicated with each other by being integrally formed with the first tube wall portion 11 by welding and integrally formed with the first tube wall portion 11 by welding. And a second pipe wall portion 14 that defines the communication passage 13 in the sound deadening chamber 9, and the welded joint surfaces of the first chamber wall portion 8 and the second chamber wall portion 10. Welding the bonding surface of the first wall portion 11 and the second wall portion 14 and are on the same plane P.

  The intake duct 1 with the resonator 7 having such a configuration was manufactured as follows.

  First, the duct upper wall part 2 in which the first chamber wall part 10 and the first pipe wall part 11 are integrally formed by injection molding from a synthetic resin material such as polyethylene (PE) or polypropylene (PP) as a thermoplastic resin. The duct lower wall portion 6 and the second chamber wall portion 10 in which the second tube wall portion 14 is integrally formed via the connecting portion 12 are each formed into a predetermined shape.

  As shown in FIG. 5, a hot plate 18 heated to a predetermined temperature is interposed between the first and second flange portions 15 and 16 of the first and second chamber wall portions 8 and 10, and the first chamber The side surfaces of the wall portion 8 and the second chamber wall portion 10 are gripped by the first and second welding jigs 19 and 20, respectively, and the first and second flange portions 15 and 16 are brought into contact with the hot plate 18, and at the same time, The opposing end surfaces of the first tube wall portion 11 and the second tube wall portion 14 were brought into contact with the hot plate 18. Thereby, the 1st and 2nd flange parts 15 and 16 and the 1st and 2nd tube wall parts 11 and 14 were fuse | melted simultaneously.

  Then, the second chamber wall 10 is lifted while holding the side surface of the second chamber wall 10 with the second welding jig 20, the hot plate 18 is removed in the horizontal direction, and then the second welding jig 20 performs the second operation. The second chamber wall 10 was lowered while grasping the side surface of the chamber wall 10. Thus, as shown in FIG. 6, the first and second flange portions 15 and 16 are brought into contact with each other at the same time, and the end surfaces of the first tube wall portion 11 and the second tube wall portion 14 are brought into contact with each other. A predetermined load was applied by sandwiching the first and second flange portions 15 and 16 with the first and second welding jigs 19 and 20 for a predetermined time, and the respective welding joint surfaces were integrally bonded.

  Finally, the duct upper wall portion 2 and the duct lower wall portion 6 are bolted and integrally joined by welding, claw fitting, or the like to complete the intake duct 1 with the resonator 7.

  Therefore, in the resonator 7 according to the present embodiment, a so-called communication pipe that defines the communication path 13 that communicates the air flow path 5 and the muffler chamber 9 is divided into the first tube wall portion 11 and the second tube wall portion 14. The first tube wall portion 11 is integrally formed with the duct upper wall portion 2 as a duct wall defining the air flow path 5, while the second tube wall portion 14 is secondly connected via the connecting portion 12. It is formed integrally with the chamber wall 10. The weld joint surface between the first chamber wall portion 8 and the second chamber wall portion 10 and the weld joint surface between the first tube wall portion 11 and the second tube wall portion 14 are on the same plane P.

  For this reason, the first chamber wall portion 8 and the second chamber wall portion 10 are integrally joined by hot plate welding using the hot plate 18, and at the same time, the first tube wall portion 11 is obtained by hot plate welding using the same hot plate 18. And the second tube wall portion 14 can be integrally joined. Therefore, without being restricted by the height position of the welding joint surface between the first chamber wall portion 8 and the second chamber wall portion 10 that defines the muffler chamber 9, at least the length of the second tube wall portion 14. The length of the communication path 13 can be increased in the muffler chamber 9. Therefore, the length of the communication path 13 can be increased without being limited by the height position of the welding joint surface in the sound deadening chamber 9 having a limited volume due to space limitations. Therefore, it is possible to provide the resonator 7 that is effective for resonance and silencing in a lower frequency region.

  Further, a first tube wall portion 11 formed integrally with a duct upper wall portion 2 in which the resonator 7 is integrally provided and is integrated with the first chamber wall portion 8, and a second chamber wall portion. Since the second pipe wall portion 14 formed integrally with the first chamber wall portion 8 and the second chamber wall portion 10 are welded to each other at the same time by hot plate welding, a communication pipe can be provided. Therefore, it is not necessary to separately form only a communication pipe bent in order to increase the length of the communication pipe and to assemble it afterwards. Therefore, avoiding inconveniences such as an increase in the number of parts increases the cost of parts and molds, or the productivity of the connection pipe is reduced due to an increase in the process of assembling the communication pipe or forgetting to install the communication pipe. be able to.

  Further, the height position of the welding joint surface can be changed within a range in which the holding allowance of the welding jig can be ensured at the time of hot plate welding, and the shape of the second chamber wall portion 10 and the like defining the sound deadening chamber 9 It becomes possible to improve the degree of freedom in designing the size.

  Therefore, according to the present embodiment, it is possible to provide the intake duct 1 with the resonator 7 that exhibits all the operational effects of the resonator 7.

(Embodiment 2)
In the present embodiment shown in FIG. 7, the resonator of the present invention is provided integrally with an air cleaner, and the intake device with a resonator of the present invention is applied to an air cleaner with a resonator.

  The air cleaner 21 is connected to an outlet side end of an intake duct (not shown) and has an inlet 22 into which low-temperature outside air is introduced from the intake duct, and an outlet for supplying air purified by the air cleaner to an engine (not shown). 24, and a cap 26 which is integrally joined to the case 23 and defines the air chamber 25 together with the case 23. An air cleaning filter 27 is disposed in the air chamber 25.

  The resonator 28 according to the present embodiment is integrally provided in a case 23 that defines an air chamber 25 of the air cleaner 21 together with a cap 26.

  That is, the resonator 28 is integrally joined to the first chamber wall portion 29 formed integrally with a case 23 as a chamber wall defining the air chamber 25 and the first chamber wall portion 29 by hot plate welding. And a second chamber wall portion 31 which forms a box shape together with the first chamber wall portion 29 and defines a sound deadening chamber 30 adjacent to the air chamber 25. The resonator 28 is integrally formed with the first tube wall portion 32 formed integrally with the case 23 integrally formed with the first chamber wall portion 29 and the second chamber wall portion 31 via the connecting portion 33. In addition, a communication passage 34 that is integrally joined to the first tube wall portion 32 by hot plate welding to form a tubular shape with the first tube wall portion 32 and communicates the air chamber 25 and the sound deadening chamber 30 is formed in the sound deadening chamber 30. And a second pipe wall portion 35 that is defined.

  And the welding joint surface of the said 1st chamber wall part 29 and the said 2nd chamber wall part 31 and the welding joining surface of the said 1st pipe wall part 32 and the said 2nd pipe wall part 35 are the same surfaces (FIG. 7). Q side).

  The first and second chamber wall portions 29 and 31 have first and second flange portions 36 and 37, respectively, and the first and second flange portions 36 and 37 are integrated with each other by hot plate welding. It is joined to. The connecting portion 33 that connects the second chamber wall portion 31 and the second tube wall portion 35 has a substantially U-shaped cross-sectional shape. The reason why the cross-sectional shape of the connecting portion 33 is substantially U-shaped is that the load is supported by a so-called three-point support in order to prevent the connecting portion 33 from being deformed so as to bend due to the load from the hot plate during hot plate welding. This is to improve the rigidity of the connecting portion 33 by receiving it. Moreover, the 1st tube wall part 32 and the 2nd tube wall part 35 have comprised the substantially elliptical cross-sectional shape. In addition, the 1st chamber wall part 29 and the 2nd chamber wall part 31 have comprised the substantially rectangular cross-sectional shape.

  Therefore, the air cleaner 21 with the resonator 28 according to this embodiment has the following configuration.

  That is, the air cleaner 21 with the resonator 28 is formed integrally with the case 23, the cap 26 that is integrally joined to the case 23, forms a box shape with the case 23, and defines the air chamber 25. A first chamber wall 29 and a second chamber which are integrally joined to the first chamber wall 29 by welding and form a box shape together with the first chamber wall 29 to define a silencer chamber 30 adjacent to the air chamber 25. The chamber wall 31, the first tube wall portion 32 formed integrally with the case 23 in which the first chamber wall portion 29 is integrally molded, and the second chamber wall portion 31 are integrally molded via the connecting portion 33. At the same time, a communication passage 34 that is integrally joined to the first tube wall portion 32 by welding and forms a tubular shape with the first tube wall portion 32 to communicate the air chamber 25 and the sound deadening chamber 30 is defined in the sound deadening chamber 30. A second pipe wall portion 35, and a first chamber wall portion 29 and And fusion bonded surface of the two chamber walls 31, the fusion bonded surface of the first wall portion 32 and the second wall portion 35 and are on the same plane Q.

  Therefore, the resonator 28 according to the present embodiment and the air cleaner 21 with the resonator 28 basically have the same functions and effects as those of the first embodiment.

It is sectional drawing which shows typically the whole structure of the intake duct with a resonator which concerns on Embodiment 1 of this invention. It is a side view of the intake duct with a resonator concerning Embodiment 1 of the present invention. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2 according to the first embodiment of the present invention. FIG. 3 is a cross-sectional view taken along the line BB (CC line) in FIG. 2 according to the first embodiment of the present invention. It is sectional drawing which concerns on Embodiment 1 of this invention, and shows a mode that the resonator is manufactured by hot plate welding. It is sectional drawing which concerns on Embodiment 1 of this invention, and shows a mode that the resonator is manufactured by hot plate welding. It is sectional drawing which shows typically the whole structure of the air cleaner with a resonator which concerns on Embodiment 2 of this invention. It is a fragmentary sectional view which shows typically the air cleaner with a resonator of a prior art example. It is a fragmentary sectional view showing typically an intake duct with a resonator of other conventional examples.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Air intake duct 2 ... Duct upper wall part 5 ... Air flow path 6 ... Duct lower wall part 7 ... Resonator 8 ... First chamber wall part 9 ... Silencer room 10 ... Second chamber wall part 11 ... First pipe wall part 12 ... Connection part 13 ... Communication passage 14 ... Second pipe wall part 18 ... Heat plate 19 ... First welding jig 20 ... Second welding jig 21 ... Air cleaner 23 ... Case 25 ... Air chamber 26 ... Cap 28 ... Resonator 29 ... 1st chamber wall part 30 ... Silencer room 31 ... 2nd chamber wall part 32 ... 1st pipe wall part 33 ... Connection part 34 ... Communication path 35 ... 2nd pipe wall part

Claims (2)

A first chamber wall portion integrally formed with a duct wall defining an air flow path or a chamber wall defining an air chamber, and the first chamber wall portion integrally bonded to the first chamber wall portion by welding. And having a second chamber wall portion that forms a box shape with the chamber wall portion and defines the air flow path or the silencing chamber adjacent to the air chamber,
The pipe wall or the chamber wall integrally molded with the first chamber wall and the first tube wall formed integrally with the chamber wall, and the second chamber wall and the first chamber wall are integrally molded via a connecting portion. A communication path that is integrally joined to the first tube wall portion by welding and forms a tubular shape with the first tube wall portion to communicate the air flow path or the air chamber and the muffler chamber is defined in the muffler chamber. A second pipe wall portion formed,
The resonator according to claim 1, wherein the welding joint surfaces of the first chamber wall portion and the second chamber wall portion and the welding joint surfaces of the first tube wall portion and the second tube wall portion are on the same plane. A tubular intake duct having a duct wall defining an air flow path or a box-shaped air cleaner having a chamber wall defining an air chamber;
A first chamber wall formed integrally with the pipe wall or the chamber wall;
A second chamber wall portion integrally joined to the first chamber wall portion by welding and forming a box shape together with the first chamber wall portion to define a silencer chamber adjacent to the air flow path or the air chamber. When,
A first pipe wall portion formed integrally with the pipe wall or the chamber wall formed integrally with the first chamber wall portion;
The second chamber wall is integrally formed with a connecting portion and is integrally joined to the first tube wall by welding, and forms a tube with the first tube wall to form the air flow path or A second pipe wall portion defining a communication path communicating with the air chamber and the muffler chamber in the muffler chamber;
With the resonator, the welding joint surfaces of the first chamber wall portion and the second chamber wall portion and the welding joint surfaces of the first tube wall portion and the second tube wall portion are on the same plane. Intake device.

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