JP6539576B2 - Resonator - Google Patents

Description

  The present invention relates to a resonator provided in an intake system of an internal combustion engine.

  In an internal combustion engine mounted on a vehicle such as a car, a resonator is disposed in the middle of the intake duct in order to reduce intake noise generated when the air is sucked through the intake duct. The resonator is a hollow box-like body, and is configured to reduce intake noise and the like by utilizing the resonance action of the resonance space defined inside the box-like body. As such a resonator, the inside of the main body case defining the resonance space is divided into a plurality of resonance chambers by a partition plate, and the frequency components of the propagation sound to be aimed in each resonance chamber are reduced, thereby a wide range. What is called a tandem resonator that can cope with a frequency band has been proposed (see, for example, Patent Document 1).

  The resonator is configured by combining an upper half and a lower half obtained by molding a resin. For example, in the resonator, a lower half, which is open at the lower side of the resonance space, and a lower half, which is open at the upper side of the resonance chamber, are butted against each other by a flange portion extended at the opening edge. By heating and welding, a box shape having a resonance space inside is obtained. The tandem resonator is configured such that the ends of partition plates integrally formed in the lower and upper halves are abutted against each other to separate a resonance space, or integrally in one of the lower or upper halves. The tip of the formed partition plate is abutted against the other side to partition the resonance space.

Japanese Utility Model Application Publication No. 5-75469

  In the tandem resonator, a partition plate formed so as to rise from a half may be deformed due to molding shrinkage or the like, and when the upper and lower halves are combined, bonding failure between the tip of the partition plate and the other side may occur. . If such a defective connection of the partition plate occurs and the partition plates can not appropriately partition the resonance chambers, the reduction effect of the frequency component to be aimed at in each resonance chamber is reduced.

  That is, in view of the above-mentioned problems according to the prior art, the present invention has been proposed to suitably solve these, and it is an object of the present invention to provide a resonator in which the resonance chambers are appropriately partitioned by partition walls. I assume.

In order to overcome the above problems and achieve the desired purpose, the resonator according to the invention of claim 1 of the present application is
In a resonator in which a plurality of resonance chambers are defined by dividing a resonance space by a partition wall,
A first division portion that constitutes an outer shell that defines the resonance space and is provided with the partition wall;
An outer shell which defines the resonance space, and a second divided portion fixed to an outer edge of the first divided portion that abuts on each other;
The second division unit is
A fitting portion formed in a groove shape in which the tip end edge of the partition wall is fitted, and sandwiching the tip end edge of the partition wall in a plate thickness direction;
A guide which is formed so as to extend to the root side of the partition wall than the fitting portion, and which inclines toward the groove opening edge of the fitting portion as the partition wall is inserted into the fitting portion. The gist of the present invention is the provision of a guide portion having a surface.
According to the invention of claim 1, when the first and second divisions are combined, the partition wall is inserted into the fitting portion at the guiding surface of the guiding portion which is inclined toward the groove opening of the fitting portion. Since the leading edge of the partition wall can be reliably fitted to the fitting portion. Further, in the resonator, since the tip end edge of the partition wall fitted in the fitting portion is sandwiched in the thickness direction by the fitting portion, the partition walls can properly partition the resonance chambers. Further, since the resonators are appropriately partitioned between the resonance chambers, it is possible to obtain the effect of reducing the frequency components to be targeted in each of the resonance chambers.

In the invention according to claim 2, the partition wall is formed to extend outward beyond the opening edge of the first divided portion formed in a box shape whose one surface is open,
The second divided portion is formed in a groove shape continuous with the fitting portion, and includes a holding portion which holds the side edge of the extending portion extending beyond the opening edge in the partition wall in the thickness direction. As the abstract.
According to the invention of claim 2, when combining the first divided portion and the second divided portion, the extending portion side edge of the partition wall extending beyond the outer edge of the first divided portion is guided by the holding portion. Since the leading edge of the partition wall can be guided so as to be inserted into the fitting portion connected to the holding portion, the leading edge of the partition wall can be reliably fitted by the fitting portion. In addition, since the extension side edge of the partition wall fitted in the sandwiching portion is sandwiched between the sandwiching portions in the thickness direction, the resonator can more appropriately partition the resonance chambers partitioned by the partition wall. it can. Further, since the resonators are appropriately partitioned between the resonance chambers, it is possible to obtain the effect of reducing the frequency components to be targeted in each of the resonance chambers.

In the invention according to claim 3, when the outer edges are butted against each other, a gap is set between the tip end surface of the partition wall fitted in the fitting portion and the bottom of the fitting portion. The gist is that the first divided portion and the second divided portion have their outer edges welded.
According to the third aspect of the present invention, the gap generated between the front end surface of the partition wall and the bottom of the fitting portion absorbs an error caused by welding of the first divided portion and the second divided portion. be able to.

In the invention according to claim 4, the guide portion is such that the guide surface facing the plate surface of the partition wall is continuous with the groove opening edge of the fitting portion, and the partition is directed toward the root side of the partition wall The gist is that it is formed to be inclined away from the wall surface of the wall.
According to the invention of claim 4, when combining the first divided portion and the second divided portion, the partition wall is inserted into the fitting portion at the guiding surface of the guiding portion which is inclined toward the groove opening of the fitting portion You will be guided more appropriately.

The invention according to claim 5 is summarized in that the guide portion is disposed such that the guide surfaces face each other across the partition wall in the thickness direction.
According to the invention of claim 5, when combining the first divided portion and the second divided portion, the partition wall is inserted into the fitting portion at the guiding surface of the guiding portion which is inclined toward the groove opening of the fitting portion You will be guided more appropriately.

In the invention according to claim 6, one of the first dividing portion and the second dividing portion is integrally formed with a duct segment defining an air flow passage in the duct.
According to the invention as set forth in claim 6, any one of the first division and the second division is integrally formed with the duct division defining the air flow passage in the duct, thereby reducing the number of parts. be able to.

  According to the resonator of the present invention, since the space between the resonance chambers is appropriately divided by the partition wall, resonance noise in a frequency range targeted by each resonance chamber can be effectively reduced.

FIG. 1 is a schematic perspective view showing an intake duct provided with a resonator according to a preferred embodiment of the present invention. It is a schematic perspective view which shows the resonator of an Example, and a 1st duct segment. It is a schematic perspective view which shows the 1st division part and the 1st duct division of an example. It is a schematic perspective view which shows the 2nd division part of an Example. (a) is an end elevation which fractured the resonator of an example in the position where a guide part is not provided, (b) is an important section sectional view showing a fitting part, (c) fits a partition wall It is explanatory drawing which shows the condition inserted in a part. (a) is an end elevation which fractured the resonator of an example in the position in which a guidance part was provided, and (b) is an important section sectional view showing a guidance part. (a) is sectional drawing cut | disconnected by the AA line of FIG. 5, (b) is explanatory drawing which shows the attachment condition of a 1st division part and a 2nd division part.

  Next, a resonator according to the present invention will be described below by way of preferred embodiments with reference to the attached drawings. In the following description, front, rear, left, right, upper and lower of the intake duct and the resonator are referred to on the basis of the mounting state of the intake duct constituting the intake system of the internal combustion engine to the vehicle.

  As shown in FIG. 1, the resonator 20 according to the embodiment is provided in an intake duct (duct) 10 for a vehicle. The intake duct 10 is a cylindrical body defined with an air flow passage 12 connected from an inlet 10a formed at one end to a delivery port 10b formed at the other end, and the radiator installed on the front side of the engine room The inlet 10a side is fixed to the top of the radiator support for fixing. Further, the intake duct 10 is connected to an air cleaner (intake device) connected to an engine installed in the engine room with a delivery port 10b, and the air taken in from an intake 10a disposed on the front side of the vehicle body is delivered from the delivery port 10b. It is sent out to the air cleaner. The intake duct 10 is formed with an air flow passage 12 so that the delivery port 10b opens toward the rear of the vehicle after being curved obliquely downward from an inlet 10a that opens toward the front of the vehicle. The intake duct 10 is formed in a groove shape opened downward, and is formed in a groove shape opened upward, and a first duct division 14 that forms the upper side of the air flow passage 12. It is comprised from the 2nd duct part 16 which comprises the side. The intake duct 10 is assembled in a tubular shape by joining side edges where the first duct segment 14 and the second duct segment 16 abut each other. The resonator 20 and the intake duct 10 are configured by combining resin-molded parts formed by injection molding or the like from polypropylene (PP) or the like.

  As shown in FIGS. 1 and 2, the resonator 20 is disposed on the upper surface of the first duct division 14 of the intake duct 10 from the obliquely extending portion of the air flow passage 12 to the outlet 10b downstream thereof. It is provided to the continuation part. The resonator 20 is basically constituted of a first divided portion 22 integrally formed with the first duct divided body 14 and a second divided portion 24 separately formed from the intake duct 10. In the resonator 20, an outer shell defining a hollow resonance space 21 is formed by a first divided portion 22 and a second divided portion 24 which are combined in a box shape by fixing outer edges butted to each other. Further, in the resonator 20, a plurality of resonance chambers 21a and 21b are defined by dividing the resonance space 21 by a partition wall 26 (see FIGS. 5 and 6). In the embodiment, the resonance space 21 is divided into the front and back of the air flow direction by the partition wall 26 extending in the left and right direction intersecting with the air flow direction of the air flow passage 12, and two resonance chambers 21a and 21b are provided. There is. In the resonator 20 of the embodiment, the partition wall 26 is disposed to be biased to the front side of the resonance space 21, and the first resonance chamber 21a provided on the front side in the air circulation direction is provided on the rear side in the air circulation direction. The volume is set to be smaller than that of the second resonance chamber 21b. Further, in the resonator 20, communication parts 28 and 29 connecting the resonance chambers 21a and 21b and the air flow passage 12 penetrate the first duct division 14 constituting the lower wall of the resonance space 21 to form the resonance chamber 21a. , 21b, respectively (see FIG. 2, FIG. 5 (a) and FIG. 6 (a)). In the resonator 20, a first communication portion 28 connected to the first resonance chamber 21a is opened at an obliquely extending portion of the air flow passage 12, and a second communication portion 29 connected to the second resonance chamber 21b is a first opening. The air flow passage 12 is opened downstream of the communication portion 28 in a portion connected to the delivery port 10 b.

  As shown in FIG. 3, the first divided portion 22 is opened upward by the first duct division 14 and the first outer wall 30 rising from the upper surface of the first duct division 14 and continuously connected in a square ring shape. It is formed in the shape of a box. The first divided portion 22 constitutes an outer shell that defines the lower portion (the side on which the communication portions 28 and 29 are provided) of the resonance space 21. In the embodiment, the first divided portion 22 is formed such that the upper edge (outer edge) of the first outer wall 30 defining the upper opening conforms to the upper surface of the first duct division 14 forming the bottom of the first divided portion 22. It is done. Specifically, the upper edge of the first outer wall 30 is horizontally behind the upper extension, behind the inclined extension that inclines downward as it extends rearward from the horizontally extending upper extension. The extending lower extending portion is formed to be continuous. Further, at the upper edge of the first outer wall 30 forming the upper opening edge of the first divided portion 22, a first joint portion 32 which is abutted and joined to the outer edge of the second divided portion 24 is provided.

  As shown in FIG. 3, the partition wall 26 is provided to rise from the bottom surface (upper surface of the first duct division 14) facing the second division 24 in the first division 22, and in the plate thickness direction The resonance spaces 21 are partitioned so that the resonance chambers 21a and 21b are aligned. The partition wall 26 rises from the upper surface of the first duct segment 14 in the same direction as the first outer wall 30 and extends so as to intersect the air flow passage 12 between the opposing first outer walls 30. (See Figure 7). Further, the partition wall 26 is formed to extend upward (outwardly) beyond the first joint portion 32 at the upper edge of the first outer wall 30, and extends beyond the first joint portion 32 ( Hereinafter, the partition extension portion is inserted inside the second divided portion 24. Partition wall 26 is disposed corresponding to a portion where the upper edge of first outer wall 30 is the upper extension portion in first divided portion 22, and the tip edge is higher than the upper extension portion at the upper edge of first outer wall 30. It protrudes upward. Furthermore, the partition wall 26 is formed to be thinner as it goes from the first duct division 14 (root) to the tip edge (see FIGS. 5 and 6). In addition, the 1st duct division body 14, the 1st division part 22, and the partition wall 26 are integrally formed by the shaping | molding by the same shaping | molding die.

  As shown in FIG. 4, the second divided portion 24 hangs from an upper wall 34 opposed to the upper surface (bottom of the first divided portion 22) of the first duct division 14 and a lower surface of the upper wall 34. It is formed in the box shape opened downward by the 2nd outer wall 36 continuously connected cyclically | annularly. The second division portion 24 constitutes an outer shell that defines the upper portion of the resonance space 21. The second divided portion 24 of the embodiment forms the bottom of the first divided portion 22 so that the lower edge (outer edge) of the second outer wall 36 defining the lower opening matches the upper edge of the first outer wall 30. It is formed according to the upper surface of the one duct division 14. Specifically, the lower edge of the second outer wall 36 is horizontally behind the upper extension, behind the inclined extension that inclines downward as it extends rearward from the horizontally extending upper extension. The extending lower extending portion is formed to be continuous. Further, at the lower edge of the second outer wall 36, a second joint portion 38 which is abutted and joined to the first joint portion 32 of the first divided portion 22 is provided. Then, the butted outer edges of the first divided portion 22 and the second divided portion 24 are fixed to each other by heat welding in which the outer edge bonding portions 32 and 38 are melted and bonded by heat.

  As shown in FIG. 4, in the second divided portion 24, the fitting portion 40 sandwiching the leading end edge of the partition wall 26 provided in the first divided portion 22 in the thickness direction and the leading edge of the partition wall 26 are fitted And a guide portion 42 for guiding the fitting portion 40 to be fitted. Further, the second divided portion 24 includes a holding portion 44 which holds the side edge of the partition extension portion extending upward from the first joint portion 32 in the partition wall 26 in the thickness direction. The resonator 20 fits the front end edge of the partition wall 26 into the fitting portion 40 of the second divided portion 24, and fits the partition extension side edge of the partition wall 26 into the holding portion 44 of the second divided portion 24. , Without bonding or welding the front end edge and the side edge of the partition wall 26 to the second divided portion 24 and configured to partition the two resonance chambers 21a and 21b (see FIGS. 5 to 7A). ).

  As shown in FIG. 5, the fitting portion 40 is provided on the lower surface of the upper wall 34 in the second divided portion 24 so as to face the partition wall 26. The fitting portion 40 extends in such a manner as to cross the air flow passage 12 between the mutually opposing second outer walls 36, and is formed in a groove shape in which the leading edge of the partition wall 26 is fitted. The fitting portion 40 of the embodiment is formed in a groove shape that fits over the entire leading edge of the partition extension portion of the partition wall 26 (see FIG. 4). The fitting portion 40 is formed to extend downward from the lower surface of the upper wall 34 in the same direction as the second outer wall 36 (the root side of the partition wall 26), and a pair of oppositely disposed in the air flow direction It is a groove defined between the plate pieces. The fitting portion 40 is set such that the groove width (the distance between the opposing plate-like pieces) is the same as or slightly smaller than the thickness of the tip edge of the partition wall 26, and the plate surface of the partition wall 26 and the fitting portion 40 face each other. It comes in contact with the groove wall. Further, when the joining portions 32 and 38 (outer edges) of the first divided portion 22 and the second divided portion 24 butt each other, the tip end surface (upper surface) of the partition wall 26 fitted in the fitting portion 40 and the fitting portion A gap is set between the bottom of the 40 (ceiling surface). Here, the gap between the tip end face of the partition wall 26 and the bottom of the fitting portion 40 is welded when the first divided portion 22 and the second divided portion 24 are welded by heat, and the welded portions 32, 38 are shortened. Set in consideration of costs. For example, if a welding margin of 1 mm is expected in each of the bonding portions 32 and 38, the gap is set to 2 mm or more, and the first divided portion 22 and the second divided portion 24 are thermally welded to form a resonator 20. When doing so, the end face of the partition wall 26 and the bottom of the fitting portion 40 are in contact or slightly spaced (FIG. 5B). When the joining portions 32 and 38 of the first divided portion 22 and the second divided portion 24 are butted against each other, the tip end edge of the partition wall 26 is in a state of being inserted into the fitting portion 40. The second divided portion 24 is bent so that the formation portion of the fitting portion 40 in the upper wall 34 is recessed downward (inside the resonance space 21), and the fitting portion 40 is formed on the convex end face of the recess 35. It is provided.

  As shown in FIGS. 5 and 6, the guide portion 42 hangs down from the lower surface of the upper wall 34 in the second divided portion 24 and is lower than the groove opening of the fitting portion 40 (the root side of the partition wall 26). It is formed to extend. Further, the guide portion 42 has a guide surface 43 which inclines toward the groove opening edge of the fitting portion 40 as it goes in a direction (insertion direction) in which the partition wall 26 is inserted into the fitting portion 40. . The guide portion 42 is a plate-like protrusion formed to extend downward from the lower surface of the upper wall 34 in the same direction as the second outer wall 36, and extends from the side surface of the recess 35 of the upper wall 34 to the convex end surface It is provided beside the fitting portion 40 so as not to overlap with the groove opening of the fitting portion 40. The guide portion 42 is provided such that the thickness direction thereof is the same as the extending direction of the groove of the fitting portion 40, and the end face on the groove side of the fitting portion 40 is a guide surface 43. In the second divided portion 24, the pair of guide portions 42, 42 are arranged such that the guide surfaces 43 face each other with the partition wall 26 sandwiched in the thickness direction (see FIG. 6), and the pair of guides A plurality of sets of the parts 42, 42 are provided separately in the extending direction of the groove of the fitting part 40 (see FIG. 7). The guide portion 42 is formed such that the guide surface 43 facing the plate surface of the partition wall 26 is continuous with the groove opening edge of the fitting portion 40 and is inclined so as to be away from the plate surface of the partition wall 26 as it goes downward. It is done. The pair of guide portions 42, 42 are symmetrical with respect to the fitting portion 40. The distance between the guide surfaces 43, 43 of the pair of guide portions 42, 42 is configured so as to narrow from the root side of the partition wall 26 (inside the resonance space 21) toward the groove opening of the fitting portion 40, The thickness is set larger than the thickness of the partition wall 26.

  As shown in FIGS. 4 and 7, the holding portion 44 is provided on the inner surface of the second outer wall 36 in the second divided portion 24 so as to be continuous with the fitting portion 40. In the second divided portion 24, sandwiching portions 44 are provided on each of the second outer walls 36 facing each other across the side end face of the partition wall 26, and the sandwiching portions 44 disposed opposite to each other have a symmetrical shape. The sandwiching portion 44 extends in the insertion direction of the partition wall 26 and is formed in a groove shape fitted to the partition extension side edge of the partition wall 26 except for the tip edge fitted to the fitting portion 40. The holding portion 44 of the embodiment is formed to extend from the inner surface of the second outer wall 36 to the inside of the resonance space 21 and is defined between a pair of plate-like pieces disposed opposite to each other in the air flow direction. It consists of grooves. The width of the groove 44 (the distance between the opposing plate-like pieces) is set to be the same as or slightly smaller than the thickness of the partition wall 26, and the plate surface of the partition wall 26 facing each other contacts the groove wall of the sandwiching portion 44. It is supposed to be. Further, even if the side end face of the partition wall 26 fitted in the sandwiching portion 44 is set so as to contact the bottom of the sandwiching portion 44 (the inner surface of the second outer wall 36), the side wall of the partition wall 26 fitted in the sandwiching portion 44 A gap may be set between the side end surface and the bottom of the holding portion 44 or may be set. The gap between the partition wall 26 and the second divided portion 24 is set by setting the gap between the side end surface of the partition wall 26 fitted in the sandwiching portion 44 and the bottom of the sandwiching portion 44 by this gap. Can be absorbed. The plate-like piece defining the sandwiching portion 44 is formed so that the lower end face is aligned with the lower end face of the second joint portion 38, and is joined to the first joint portion 32 of the first divided portion 22. Further, the lower opening which becomes the insertion start end of the partition wall 26 when the first divided portion 22 and the second divided portion 24 are assembled is opened so as to widen from the upper side to the lower side when the first divided portion 22 and the second divided portion 24 are assembled.

[Operation of Example]
Next, the operation of the resonator 20 according to the embodiment will be described. The first bonding portion 32 of the first divided portion 22 and the second bonding portion 38 of the second divided portion 24 are heated by a heating plate to abut the melted first bonding portion 32 and second bonding portion 38 with each other Thus, a resonator in which the first divided portion 22 and the second divided portion 24 are welded is obtained. Since the partition wall 26 is integrally formed with the first divided portion 22 and the first duct division 14 in a rib shape, the plate thickness direction and the erecting direction (to the fitting portion 40) are caused due to molding shrinkage and the like. It may be deformed in the insertion direction). According to the resonator 20 of the embodiment, when the first divided portion 22 and the second divided portion 24 are combined, they are guided by the guiding surface 43 of the guiding portion 42 inclined toward the groove opening of the fitting portion 40, The tip edge of the partition wall 26 deformed in the thickness direction can be corrected to the position that should be originally, and the tip edge of the partition wall 26 can be reliably fitted to the fitting portion 40. The guide portion 42 is such that the guide surface 43 facing the plate surface of the partition wall 26 is continuous with the groove opening edge of the fitting portion 40 and is separated from the plate surface of the partition wall 26 toward the root side of the partition wall 26 The tip edge of the partition wall 26 deformed in the plate thickness direction is smoothly guided to the fitting portion 40 in accordance with the butt between the first divided portion 22 and the second divided portion 24. be able to. In the second divided portion 24, the pair of guide portions 42 and 42 are arranged such that the guide surfaces 43 face each other with the partition wall 26 interposed therebetween in the plate thickness direction. Even if the end of the partition wall 26 is deformed, the front end edge of the partition wall 26 can be corrected to an appropriate position, and the front end edge of the partition wall 26 can be fitted to the fitting portion 40 more reliably. Further, since the fitting portion 40 is formed in a groove shape, the contraction of the partition wall 26 in the erecting direction is absorbed by the depth of the groove, and the tip edge of the partition wall 26 is reliably secured to the fitting portion 40. Can be fitted to The resonator 20 has a configuration in which the tip end edge of the partition extension portion of the partition wall 26 fitted in the fitting portion 40 is sandwiched in the thickness direction by the fitting portion 40 over the whole. The space between the divided resonance chambers 21a and 21b can be closed.

  According to the resonator 20 of the embodiment, when combining the first divided portion 22 and the second divided portion 24, the extending portion side edge of the partition wall 26 extending beyond the outer edge of the first divided portion 22 is the clamping portion Since the leading edge of the partition wall 26 can be guided so as to be guided by the guide 44 and inserted into the fitting portion 40 connected to the holding portion 44, the leading edge of the partition wall 26 can be fitted securely by the fitting portion 40 it can. Further, the resonator 20 has a configuration in which the extending side edge of the partition wall 26 fitted in the sandwiching portion 44 is sandwiched by the sandwiching portion 44 in the plate thickness direction, the resonators 21 a and 21 b divided by the partition wall 26 It is possible to close the gap more reliably. The resonator 20 has a configuration in which the partition wall 26 is fitted to the fitting portion 40 and the sandwiching portion 44 to partition between the resonance chambers 21a and 21b without bonding or welding. Therefore, the tip end face and the side end face of the partition wall 26 There is no need to set it thick to weld with the other party. Thereby, the partition wall 26 can be set thin, and the deformation itself of the partition wall 26 due to the molding shrinkage due to the plate thickness can be suppressed.

  Since the first divided portion 22 and the second divided portion 24 are bonded by melting the bonding portions 32 and 38, a slight variation (error) occurs in the bonding margin. According to the resonator 20 of the embodiment, a gap is set between the tip end surface of the partition wall 26 fitted in the fitting portion 40 and the bottom of the fitting portion 40 when the outer edges are butted against each other. Therefore, an error generated by welding of the first division 22 and the second division 24 can be absorbed by the gap.

  As described above, since the resonator 20 is appropriately partitioned between the resonance chambers 21a and 21b by the partition wall 26, it is possible to effectively reduce the targeted frequency components in the respective resonance chambers 21a and 21b. . Moreover, since the first divided portion 22 is integrally formed with the first duct division 14 that defines the air flow passage 12 in the intake duct 10, the number of parts can be reduced. If it is a structure which welds the front-end edge of the partition wall 26 conventionally, it is necessary to thicken the partition wall 26. As shown in FIG. In the embodiment, since the partition wall 26 can be reliably inserted into the fitting portion 40 by the guide portion 42, it is not necessary to set the partition wall 26 thick, and the partition wall 26 is set thin to reduce the weight of the resonator 20. Can be Furthermore, the molding cycle, which has been set long to prevent deformation, can be shortened. Since the guide portion 42 has a shape extending in the same direction as the second outer wall 36, a complicated configuration such as a slide mechanism is not necessary, and the guide portion 42 can be realized by a simple mold installation. Adjustments such as increasing the number of guides 42, increasing the size of the guides 42, changing the angle of the guide surface 43, and the like can be made by cutting the mold, so the cost for remodeling the mold can be reduced.

(Modification example)
The present invention is not limited to the above-described embodiment, and can be changed as follows, for example.
(1) The resonator may be configured to divide the resonance space into three or more resonance chambers by a partition wall.
(2) The partition wall may not extend outward beyond the outer edge of the first divided portion, and the tip end edge may be aligned with the outer edge of the first divided portion, or may be positioned inside the first divided portion . In this case, the fitting portion extends outward from the outer edge of the second divided portion.
(3) The second divided portion may be integrally formed with a duct segment defining an air flow passage in the duct.

10 intake duct (duct), 12 airflow passage, 14 first duct division (duct division),
21 resonance space 21a first resonance chamber 21b second resonance chamber 22 first division portion
24 second divided portion, 26 partition wall, 40 fitting portion, 42 guiding portion, 43 guiding surface,
44 Holding part

Claims (6)

In a resonator in which a plurality of resonance chambers are defined by dividing a resonance space by a partition wall,
A first division portion that constitutes an outer shell that defines the resonance space and is provided with the partition wall;
An outer shell which defines the resonance space, and a second divided portion fixed to an outer edge of the first divided portion that abuts on each other;
The second division unit is
A fitting portion formed in a groove shape in which the tip end edge of the partition wall is fitted, and sandwiching the tip end edge of the partition wall in a plate thickness direction;
A guide which is formed so as to extend to the root side of the partition wall than the fitting portion, and which inclines toward the groove opening edge of the fitting portion as the partition wall is inserted into the fitting portion. A resonator comprising: a guide portion having a surface. The partition wall is formed so as to extend outward beyond the opening edge of the first divided portion formed in a box shape having one surface open,
The second divided portion is formed in a groove shape continuous with the fitting portion, and includes a holding portion which holds the side edge of the extending portion which extends beyond the opening edge in the partition wall in the thickness direction. The resonator according to Item 1.   The first divided portion and the second divided portion set such that a gap is provided between the bottom surface of the fitting portion and the tip end surface of the partition wall fitted to the fitting portion when the outer edges are butted against each other The resonator according to claim 1 or 2, wherein the portion has its outer edge welded.   The guide portion is such that the guide surface facing the plate surface of the partition wall is continuous with the groove opening edge of the fitting portion and is separated from the plate surface of the partition wall toward the root side of the partition wall The resonator according to any one of claims 1 to 3, which is formed to be inclined.   The resonator according to any one of claims 1 to 4, wherein the guide portion is disposed such that the guide surfaces face each other across the partition wall in a thickness direction.   The resonator according to any one of claims 1 to 5, wherein any one of the first dividing portion and the second dividing portion is integrally formed with a duct segment defining an air flow passage in the duct. .

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