JP2023023011A - air cleaner - Google Patents

Abstract

To provide an air cleaner capable of maintaining initial restraining force of a mounting member to a sound absorption material regardless of permanent set in fatigue of the sound absorption material.SOLUTION: In an air cleaner, a sound absorption material 21 is mounted in a case 12 by a mounting mechanism 22. The mounting mechanism 22 includes: a projection part 25 that is projectingly provided on the inner bottom surface 12b of the case 12, penetrates the sound absorption material 21 and has a first engagement portion 23 and a pressure receiving portion 24; a mounting member 27 that sandwiches the sound absorption material 21 with the bottom surface 12b of the case 12 and has a second engagement portion 26 engaged with the first engagement portion 23; and an urging part 28 that, in a state of contacting with the pressure receiving portion 24, urges the mounting member 27 in a direction to maintain the engagement state of the first engagement portion 23 and the second engagement portion 26.SELECTED DRAWING: Figure 7

Description

The present invention relates to an air cleaner with sound absorbing material.

Conventionally, an air cleaner of this type is known, for example, as disclosed in Patent Document 1. Such an air cleaner is provided in an intake system of an internal combustion engine to filter intake air. The air cleaner includes a box-like body with a bottom, a box-like cover with a lid, and a filtering element arranged between the body and the cover. A sound absorbing material for reducing intake noise is attached to the inner surface of the body of the air cleaner by a deterrent rod.

Japanese Utility Model Laid-Open No. 3-42061

In the air cleaner as described above, the sound absorbing material is attached to the inner surface of the body by fixing the restraining rod to the body with a rivet while pressing the sound absorbing material against the inner surface of the body. In this case, the restraining rod constrains the sound absorbing material by making the claw piece bite into the sound absorbing material and receiving the reaction force from the sound absorbing material. However, when the sound absorbing material weakens, the reaction force that the restraining rod receives from the sound absorbing material decreases. For this reason, there is a problem that the initial force of restraining the restraining rod against the sound absorbing material cannot be maintained.

Means for solving the above problems and their effects will be described below.
An air cleaner for solving the above-mentioned problems is an air cleaner in which a sound absorbing material is mounted in a housing by means of a mounting mechanism, the mounting mechanism protruding from the inner surface of the housing and passing through the sound absorbing material, a projecting portion having an engaging portion and a pressure receiving portion; a mounting member having a second engaging portion that sandwiches the sound absorbing material between the inner surface of the housing and engages with the first engaging portion; and the pressure receiving portion. and an urging portion that urges the mounting member in a direction to maintain the engagement state between the first engaging portion and the second engaging portion while being in contact with the second engaging portion.

Normally, when the mounting member maintains the engaged state between the first engaging portion and the second engaging portion by receiving a reaction force from the sound absorbing material, when the sound absorbing material weakens, the mounting member is separated from the sound absorbing material. The reaction force received is reduced. As a result, the engagement state between the first engaging portion and the second engaging portion cannot be maintained, and the binding force of the mounting member to the sound absorbing material is reduced. In this respect, according to this configuration, even if the sound absorbing material is worn out, the engagement state between the first engaging portion and the second engaging portion can be maintained by the biasing force of the biasing portion. Therefore, the initial binding force of the mounting member to the sound absorbing material can be maintained regardless of the settling of the sound absorbing material.

1 is a schematic cross-sectional view of an air cleaner according to one embodiment; FIG. The perspective view of a protrusion part. The perspective view of an attachment member. FIG. 4 is a perspective view when FIG. 3 is viewed from the opposite side; FIG. 5 is a cross-sectional view showing an initial operation when engaging the second engaging portion of the mounting member with the first engaging portion of the projecting portion; Sectional drawing which shows the operation|movement in the middle when engaging the 2nd engaging part of an attachment member with the 1st engaging part of a protrusion part. FIG. 2 is an enlarged view of a main portion of FIG. 1;

An embodiment of an air cleaner will be described below with reference to the drawings.
As shown in FIG. 1, the air cleaner 10 is arranged in an intake passage of an engine, which is, for example, a vehicle-mounted internal combustion engine. The air cleaner 10 has a housing 11 . The housing 11 includes a synthetic resin case 12 having a bottomed rectangular box-like shape with an opening 12a at its upper end, and a synthetic resin cap 13 having a lidded rectangular box-like shape with an opening 13a at its lower end. , and a filter element 14 arranged between the case 12 and the cap 13 .

A cylindrical inlet 15 is connected to the side wall of the case 12 to allow intake air to flow into the case 12 . A case-side flange 16 is provided around the entire periphery of the opening 12a of the case 12 . A cylindrical outlet 17 is connected to the side wall of the cap 13 to allow the intake air to flow out of the housing 11 . A cap-side flange 18 is provided around the entire periphery of the opening 13a of the cap 13 .

The filter element 14 includes a corrugated plate-like filtering portion 19 for filtering intake air, and a rectangular frame-like flexible sealing portion 20 provided over the entire peripheral portion. The filter element 14 is made of a fiber molding such as non-woven fabric and has flexibility. That is, the filter element 14 is composed of a fiber molded body in which the filtering portion 19 and the sealing portion 20 are integrally molded.

The seal portion 20 seals between the case-side flange 16 and the cap-side flange 18 by elastically deforming while being sandwiched between the case-side flange 16 and the cap-side flange 18 . The case 12 and the cap 13 are fastened by a clamp (not shown). A sound absorbing material 21 for reducing intake noise is mounted inside the case 12 (inside the housing 11 ) by a mounting mechanism 22 .

The sound absorbing material 21 is made entirely of soft foam. The sound absorbing material 21 in this embodiment is made of soft urethane foam, for example. In this case, open cell type soft urethane foam forming the sound absorbing material 21 is used. That is, the sound absorbing material 21 has a structure in which the entire surface including the surface thereof is air permeable.

The sound absorbing material 21 is arranged so as to cover the entire inner bottom surface 12b and most of the inner surface 12c of the case 12 . That is, the sound absorbing material 21 has a substantially mortar shape. In this case, the sound absorbing material 21 is not arranged on the portion of the inner surface 12c of the case 12 corresponding to the inlet 15 . A through-hole 21 a is formed in the central portion of the bottom of the sound absorbing material 21 .

As shown in FIGS. 2 and 7, the mounting mechanism 22 includes a tubular projecting portion 25 having a first engaging portion 23 and a pressure receiving portion 24, and a second engaging portion engaging with the first engaging portion 23. A circular mounting member 27 having a portion 26 and a biasing portion 28 integrally formed with the mounting member 27 are provided. The protruding portion 25 protrudes from the inner surface of the housing 11 at substantially the center of the inner bottom surface 12 b of the case 12 . The axis of the protrusion 25 is perpendicular to the inner bottom surface 12b of the case 12. As shown in FIG. The projecting portion 25 is made of synthetic resin and formed integrally with the case 12 .

The projecting portion 25 penetrates the sound absorbing material 21 . That is, the projecting portion 25 is inserted through the through hole 21 a of the sound absorbing material 21 . In this case, the tip surface 25a of the projecting portion 25 is flush with the circular flat surface 21b around the through hole 21a on the surface of the sound absorbing material 21 . A plurality (three in this example) of substantially rectangular plate-like first engaging portions 23 protruding radially inward are provided on the inner peripheral surface of the protruding portion 25 at regular intervals in the circumferential direction. there is That is, each first engaging portion 23 is provided inside the projecting portion 25 .

Each first engaging portion 23 is arranged such that its thickness direction coincides with the radial direction of the projecting portion 25 . Each first engaging portion 23 extends from the central portion in the axial direction of the projecting portion 25 to the distal end portion on the inner peripheral surface of the projecting portion 25 . The thickness of each first engaging portion 23 decreases toward the tip portion in the axial direction of the protruding portion 25 .

A radially inner surface of the projecting portion 25 of each first engaging portion 23 is a flat guide surface 23a. The guide surface 23a is inclined with respect to the axis of the protrusion 25 so as to approach the center of the protrusion 25 toward the base end of the protrusion 25 . A surface adjacent to the guide surface 23a of each first engaging portion 23 on the base end portion side of the protruding portion 25 is an engaging surface 23b. The engaging surface 23b is perpendicular to the axis of the protrusion 25. As shown in FIG.

The protruding portion 25 is provided with a plurality (three in this example) of substantially U-shaped notch grooves 29 extending straight from the distal end surface 25a toward the proximal end side at regular intervals in the circumferential direction. ing. Each notch groove 29 extends parallel to the axis of the protrusion 25 . Each notch groove 29 is arranged between two first engaging portions 23 in the circumferential direction of the projecting portion 25 . That is, the three notch grooves 29 and the three first engaging portions 23 are alternately arranged one by one in the circumferential direction of the projecting portion 25 . A bottom portion 29a of each notch groove 29 is positioned slightly closer to the proximal end portion of the projecting portion 25 than the engaging surface 23b of the first engaging portion 23 is.

A pressure receiving portion 24 is provided inside the projection 25 at a position slightly closer to the proximal end of the projection 25 than the bottom 29 a of each notch groove 29 . The pressure receiving portion 24 includes a circular pressure receiving plate 30 and a plurality of (three in this example) connecting portions 31 connecting the outer edge of the pressure receiving plate 30 and the inner peripheral surface of the projecting portion 25 . The pressure receiving plate 30 is arranged so that the axis of the projecting portion 25 passes through its center.

A gap is formed between the outer edge of the pressure receiving plate 30 and the inner peripheral surface of the projecting portion 25 where the connecting portion 31 does not exist. The positions of the three connecting portions 31 in the circumferential direction of the protruding portion 25 are aligned with the three notch grooves 29 respectively. That is, the three connecting portions 31 are arranged at regular intervals in the circumferential direction of the projecting portion 25 .

As shown in FIGS. 3 and 7, the mounting member 27 is made of synthetic resin, for example. The mounting member 27 is formed integrally with a cylindrical joint portion 32 that is joined to the projecting portion 25 while being inserted into the projecting portion 25 , and one end portion of the joint portion 32 in the axial direction. and a circular holding portion 33 that contacts the flat surface 21b.

The holding portion 33 of the mounting member 27 includes a disk-shaped base portion 34 connected to the joint portion 32, a circular frame-shaped circular frame 35 having an outer diameter larger than that of the base portion 34, an outer edge portion of the base portion 34 and the circular frame. 35 and a plurality of (four in this example) linear connecting frames 36 that connect with the inner peripheral surface of the frame 35 . The center of the base 34 and the center of the circular frame 35 are aligned. The four connecting frames 36 are arranged at regular intervals in the circumferential direction of the base 34 and the circular frame 35 . Each connecting frame 36 extends radially of the base 34 and the circular frame 35 .

Therefore, a first opening 37 is formed in a portion surrounded by the outer edge portion of the base portion 34, the inner peripheral surface of the circular frame 35, and the two connecting frames 36 adjacent to each other in the circumferential direction of the base portion 34 and the circular frame 35. It is formed. That is, the holding portion 33 of the mounting member 27 of this embodiment has four first openings 37 .

As shown in FIGS. 2 and 4, the joint portion 32 of the mounting member 27 includes a tubular main body portion 38 and a biasing portion 28 integrally formed with the main body portion 38 inside the main body portion 38. there is The outer diameter of the body portion 38 is slightly smaller than the inner diameter of the projecting portion 25 . A second opening 39 is provided at the end of the main body 38 opposite to the holding portion 33 .

The body portion 38 is provided with three rectangular third openings 40 that can be fitted with the three first engaging portions 23 of the protruding portion 25 at equal intervals in the circumferential direction. Between each third opening 40 and the second opening 39 in the body portion 38, when each third opening 40 is fitted with the first engaging portion 23, the first engaging portion 23 is engaged. A second engaging portion 26 that engages with the mating surface 23b is provided. Each second engaging portion 26 forms part of the periphery of the third opening 40 .

The urging portion 28 has a disk-like pressing portion 41 arranged so that the axis of the body portion 38 passes through the center, and the pressing portion 41 is connected to the inner peripheral surface of the body portion 38 by connecting the pressing portion 41 and the inner peripheral surface of the body portion 38 . and a plurality of (three in this example) supporting portions 42 for supporting. The pressing portion 41 is arranged at a position adjacent to the second opening portion 39 outside the main body portion 38 . That is, the pressing portion 41 is arranged at a position protruding from the body portion 38 .

Each support portion 42 connects an outer edge portion of the pressing portion 41 and a position between two adjacent third openings 40 in the circumferential direction of the main body portion 38 on the inner peripheral surface of the main body portion 38 . An end portion of each support portion 42 opposite to the outer edge portion side of the pressing portion 41 is connected to an end portion of the inner peripheral surface of the main body portion 38 on the holding portion 33 side.

The three support portions 42 are arranged at regular intervals in the circumferential direction of the body portion 38 . Each support portion 42 extends straight from the inner peripheral surface of the main body portion 38 toward the second opening 39 along the inner peripheral surface, and then curves inward in the radial direction of the main body portion 38 to form a pressing portion. 41 is connected to the outer edge.

Since each support portion 42 is made of synthetic resin, it is elastically deformed when the pressing portion 41 is pressed toward the second opening portion 39 side. That is, each support portion 42 is elastically deformed when the pressing portion 41 is pressed toward the second opening portion 39 , so that the pressing portion 41 enters the main body portion 38 from the second opening portion 39 . allow.

A plurality (three in this example) of rectangular plate-shaped guide pieces 43 protruding radially outward are provided on the outer peripheral surface of the main body portion 38 at equal intervals in the circumferential direction. The guide piece 43 connects the outer peripheral surface of the body portion 38 and the surface of the base portion 34 on the side of the body portion 38 . The radially outer surface of the body portion 38 and the surface of the outer edge of the base portion 34 of each guide piece 43 are flush with each other. Each guide piece 43 is configured to be insertable into the notch groove 29 of the projecting portion 25 .

By inserting the three guide pieces 43 of the mounting member 27 into the three notch grooves 29 of the projecting portion 25 , the mounting member 27 is positioned in the circumferential direction with respect to the projecting portion 25 . At this time, the circumferential positions of the three first engaging portions 23 of the projecting portion 25 and the three second engaging portions 26 of the mounting member 27 are aligned with each other.

Therefore, each of the guide pieces 43 and each of the notch grooves 29, when the second engaging portion 26 of the mounting member 27 is engaged with each of the first engaging portion 23 of the projecting portion 25, the mounting member with respect to the projecting portion 25 27 in the circumferential direction.

Next, the operation of mounting the sound absorbing material 21 inside the case 12 will be described.
When mounting the sound absorbing material 21 inside the case 12 , first, the sound absorbing material 21 is placed inside the case 12 so that the protrusions 25 are inserted into the through holes 21 a of the sound absorbing material 21 . Subsequently, the holding portion 33 of the mounting member 27 is parallel to the inner bottom surface 12b of the case 12, and the three guide pieces 43 provided on the main body portion 38 of the joint portion 32 are aligned with the three notch grooves 29 of the projecting portion 25, respectively. The mounting members 27 are arranged so as to face each other.

At this time, the three first engaging portions 23 of the projecting portion 25 and the three second engaging portions 26 of the main body portion 38 at the joint portion 32 of the mounting member 27 face each other. Subsequently, the joint portion 32 of the mounting member 27 is inserted into the projecting portion 25, and the three guide pieces 43 provided on the body portion 38 of the joint portion 32 are inserted into the three notch grooves 29 of the projecting portion 25, respectively. so that the mounting member 27 is moved.

Then, as shown in FIG. 5, by inserting the three guide pieces 43 into the three notch grooves 29 respectively, the mounting member 27 is positioned in the circumferential direction with respect to the projecting portion 25, and the mounting member 27 is removed. The joint 32 is inserted into the protrusion 25 . At this time, the three second engaging portions 26 of the mounting member 27 come into contact with the guide surfaces 23a of the three first engaging portions 23 of the projecting portion 25, respectively.

Subsequently, when the joint portion 32 of the mounting member 27 is pushed deep into the projecting portion 25, the second engaging portions 26 slide on the guide surface 23a toward the engaging surface 23b. At this time, each second engaging portion 26 is pushed toward the radially inner side of the protruding portion 25 by the guide surface 23 a , so that it is elastically deformed so as to curve radially inwardly of the protruding portion 25 . That is, each second engaging portion 26 is elastically deformed so as to curve inward in the radial direction of the projecting portion 25 in the course of sliding on the guide surface 23a toward the engaging surface 23b.

Subsequently, when the joint portion 32 of the mounting member 27 is further pushed deep into the projecting portion 25, as shown in FIG. While sliding toward, the pressing portion 41 of the biasing portion 28 comes into surface contact with the pressure receiving plate 30 . Subsequently, when the joint portion 32 of the mounting member 27 is further pushed deep into the projecting portion 25, as shown in FIG. reach.

Then, each of the elastically deformed second engaging portions 26 returns to its original shape before elastic deformation due to its own elastic restoring force. Thereby, each second engaging portion 26 engages with the engaging surface 23 b of the first engaging portion 23 . That is, each second engaging portion 26 is joined to each first engaging portion 23 . At this time, each first engaging portion 23 of the protruding portion 25 fits into the third opening portion 40 of the main body portion 38 of the joint portion 32 of the mounting member 27 .

Further, at this time, each guide piece 43 contacts the bottom 29a of the notch groove 29 of the projecting portion 25, and the holding portion 33 of the mounting member 27 lightly contacts the tip surface 25a of the projecting portion 25 and the flat surface 21b of the sound absorbing member 21. do. Further, at this time, the pressing portion 41 of the biasing portion 28 receives a reaction force from the pressure receiving plate 30 when pressing the pressure receiving plate 30 . Then, each support portion 42 supporting the pressing portion 41 in the urging portion 28 receives the reaction force from the pressure receiving plate 30 via the pressing portion 41, so that it is elastically deformed so as to curve more.

Due to the elastic force associated with the elastic deformation of each support portion 42 , the biasing portion 28 presses the mounting member 27 so that each second engaging portion 26 is pressed against the engaging surface 23 b of the first engaging portion 23 . force. That is, the biasing portion 28 biases the mounting member 27 in a direction opposite to the sound absorbing material 21 side in the extending direction of the projecting portion 25 in a state where the pressing portion 41 is in contact with the pressure receiving plate 30 . The engagement state between the engagement surface 23b of the first engagement portion 23 and the second engagement portion 26 is maintained. In other words, the biasing portion 28 biases the mounting member 27 in a direction to maintain the engagement state between the engaging surface 23 b of each first engaging portion 23 and the second engaging portion 26 .

In this way, each second engaging portion 26 of the mounting member 27 is joined to the first engaging portion 23 of the projecting portion 25 while the mounting member 27 sandwiches the central portion of the sound absorbing material 21 with the inner bottom surface 12b of the case 12. be done. That is, the operation of attaching the sound absorbing material 21 to the inside of the case 12 by the attachment mechanism 22 is completed.

Thus, in the air cleaner 10, the first engaging portions 23 of the protruding portion 25 and the second engaging portions 26 of the mounting member 27 are joined by a snap-fit structure. Therefore, each second engaging portion 26 of the mounting member 27 can be joined to each first engaging portion 23 of the projecting portion 25 with one touch. Therefore, the work of attaching the sound absorbing material 21 to the inside of the case 12 by the attaching mechanism 22 can be easily performed.

Here, for example, in the mounting mechanism 22 , the mounting member 27 receives a reaction force from the sound absorbing material 21 mounted inside the case 12 , thereby engaging the first engaging portions 23 and the second engaging portions 26 . The following problem arises when a configuration is adopted in which the combined state is maintained. That is, when the sound absorbing material 21 weakens, the reaction force that the mounting member 27 receives from the sound absorbing material 21 decreases.

Therefore, since a gap is formed between each first engaging portion 23 and each second engaging portion 26, the engagement state between each first engaging portion 23 and each second engaging portion 26 is can no longer be maintained. As a result, the restraining force of the mounting member 27 on the sound absorbing material 21 is reduced, and the first engaging portions 23 and the second engaging portions 26 repeatedly collide with each other due to vibrations caused by the engine, resulting in abnormal noise. problem arises.

In this regard, according to the air cleaner 10 of the present embodiment, even if the sound absorbing material 21 is worn out, the engagement state between the first engaging portions 23 and the second engaging portions 26 is maintained by the biasing force of the biasing portion 28. can. That is, the engagement state between each first engagement portion 23 and each second engagement portion 26 can be maintained regardless of the settling of the sound absorbing material 21 . Therefore, regardless of the settling of the sound absorbing material 21, the initial binding force of the mounting member 27 to the sound absorbing material 21 can be maintained, and the abnormal noise as described above can be prevented.

In the air cleaner 10 of this embodiment, the mounting member 27 does not need to receive a reaction force from the sound absorbing material 21, so the mounting member 27 is configured to lightly contact the sound absorbing material 21. FIG. Therefore, since the sound absorbing material 21 hardly receives pressure from the mounting member 27, it is difficult for the sound absorbing material 21 to sag.

Next, operation of the air cleaner 10 will be described.
As shown in FIG. 1, when the engine is started, intake air flows from the inlet 15 into the case 12 due to the intake negative pressure of the engine. The intake air that has flowed into the case 12 is filtered by the filtering portion 19 and flows into the cap 13, and then supplied from the outlet 17 to the engine side. At this time, intake noise generated by the air cleaner 10 is absorbed by the sound absorbing material 21 .

Furthermore, at this time, since the holding portion 33 of the mounting member 27 has the four first openings 37, compared to the case where the holding portion 33 of the mounting member 27 does not have the four first openings 37, the , the area where the holding portion 33 of the mounting member 27 covers the sound absorbing material 21 can be reduced. Therefore, the absorption of intake noise by the sound absorbing material 21 is prevented from being hindered by the mounting member 27, so the intake noise generated by the air cleaner 10 is effectively reduced.

According to the embodiment detailed above, the following effects are exhibited.
(1) The air cleaner 10 has a sound absorbing material 21 attached inside the housing 11 by an attachment mechanism 22 . The mounting mechanism 22 includes a projecting portion 25 that protrudes from the inner surface of the housing 11 and penetrates the sound absorbing material 21 and has a first engaging portion 23 and a pressure receiving portion 24 , and the sound absorbing material 21 and the inner surface of the housing 11 . and a mounting member 27 having a second engaging portion 26 that engages with the first engaging portion 23 while being sandwiched between the mounting member 27 and the mounting member 27 that is in contact with the pressure receiving portion 24 and is engaged with the first engaging portion 23 in the second engaging portion. and an urging portion 28 that urges in a direction to maintain the engagement state with the portion 26 .

Normally, when the mounting member 27 maintains the engaged state between the first engaging portion 23 and the second engaging portion 26 by receiving a reaction force from the sound absorbing material 21, when the sound absorbing material 21 weakens, the mounting The reaction force that the member 27 receives from the sound absorbing material 21 is reduced. As a result, the engagement state between the first engaging portion 23 and the second engaging portion 26 cannot be maintained, and the binding force of the mounting member 27 to the sound absorbing material 21 is reduced. In this regard, according to this configuration, the engagement state between the first engaging portion 23 and the second engaging portion 26 can be maintained by the biasing force of the biasing portion 28 even when the sound absorbing material 21 is worn out. Therefore, the initial binding force of the attachment member 27 to the sound absorbing material 21 can be maintained regardless of the settling of the sound absorbing material 21 .

(2) In the air cleaner 10, the first engaging portion 23 and the second engaging portion 26 are joined by a snap-fit structure.
According to this configuration, the second engaging portion 26 of the mounting member 27 can be joined to the first engaging portion 23 of the protruding portion 25 projecting from the inner surface of the housing 11 with one touch. Therefore, the work of attaching the sound absorbing material 21 into the housing 11 can be easily performed.

(3) In the air cleaner 10 , the biasing portion 28 is formed integrally with the mounting member 27 .
With this configuration, the number of parts can be reduced compared to the case where the biasing portion 28 is configured as a separate component from the mounting member 27 .

(4) In the air cleaner 10 , the projecting portion 25 has a tubular shape, and the first engaging portion 23 and the pressure receiving portion 24 are provided inside the projecting portion 25 .
This configuration can contribute to miniaturization of the mounting mechanism 22 .

(5) In the air cleaner 10 , the mounting mechanism 22 moves the mounting member 27 to the projecting portion 25 when engaging the second engaging portion 26 of the mounting member 27 with the first engaging portion 23 of the projecting portion 25 . Each guide piece 43 and each notch groove 29 are provided as an example of a positioning portion for positioning.

According to this configuration, by inserting each guide piece 43 into each notch groove 29 , the mounting member 27 can be positioned with respect to the projecting portion 25 , so that the first engaging portion 23 and the second engaging portion 26 can be engaged with high precision.

(Change example)
Note that the above embodiment may be modified as follows.
- Each guide piece 43 and each notch groove 29 as an example of a positioning part may be omitted.

- The projecting portion 25 does not necessarily have to be cylindrical. That is, the projecting portion 25 may have a columnar shape, for example.
- The first engaging portion 23 and the pressure receiving portion 24 do not necessarily have to be provided inside the projecting portion 25 . That is, the first engaging portion 23 and the pressure receiving portion 24 may be provided on the outer peripheral surface of the projecting portion 25, for example.

- The biasing portion 28 does not necessarily have to be formed integrally with the mounting member 27 . That is, the biasing portion 28 may be configured as a component separate from the mounting member 27 .
- The biasing portion 28 may be provided in the pressure receiving portion 24 .

- The biasing portion 28 may be configured by a spring, an elastomer, or the like.
- The 1st engaging part 23 and the 2nd engaging part 26 do not necessarily need to be joined by a snap-fit structure.

The mounting member 27 may sandwich the portion of the sound absorbing material 21 other than the central portion with the inner bottom surface 12 b of the case 12 .
- In the attachment member 27, the 1st opening part 37 may be abbreviate|omitted.

- You may make it attach the sound-absorbing material 21 in the cap 13 by the attachment mechanism 22. FIG.
- The material constituting the sound absorbing material 21 is not limited to soft urethane foam, but may be melamine foam, non-woven fabric, glass wool, or the like. Moreover, the material constituting the sound absorbing material 21 may be non-breathable.

DESCRIPTION OF SYMBOLS 10... Air cleaner 11... Housing 12... Case 12a... Opening part 12b... Inner bottom face 12c... Inner side face 13... Cap 13a... Opening part 14... Filter element 15... Inlet 16... Case side flange 17... Outlet 18... Cap side flange 19... Filtration part 20 Seal part 21 Sound absorbing material 21a Through hole 21b Flat surface 22 Mounting mechanism 23 First engagement part 23a Guide surface 23b Engagement surface 24 Pressure receiving part 25 Protruding part 25a Tip surface DESCRIPTION OF SYMBOLS 26... 2nd engaging part 27... Mounting member 28... Biasing part 29... Notch groove as an example of a positioning part 29a... Bottom part 30... Pressure-receiving plate 31... Connection part 32... Joint part 33... Holding part 34... Base part 35... Circular frame 36 Connection frame 37 First opening 38 Main body 39 Second opening 40 Third opening 41 Pressing part 42 Support part 43 Guide piece as an example of positioning part

Claims (5)

An air cleaner in which a sound absorbing material is mounted in a housing by a mounting mechanism,
The attachment mechanism is
a projecting portion projecting from the inner surface of the housing, penetrating the sound absorbing material, and having a first engaging portion and a pressure receiving portion;
a mounting member sandwiching the sound absorbing material with the inner surface of the housing and having a second engaging portion that engages with the first engaging portion;
a biasing portion that biases the mounting member in a direction to maintain the engagement state between the first engaging portion and the second engaging portion while being in contact with the pressure receiving portion;
An air cleaner comprising: 2. An air cleaner according to claim 1, wherein said first engaging portion and said second engaging portion are joined by a snap-fit structure. 3. An air cleaner according to claim 1, wherein said biasing portion is formed integrally with said mounting member. The projecting portion has a tubular shape,
The air cleaner according to any one of claims 1 to 3, wherein the first engaging portion and the pressure receiving portion are provided inside the projecting portion. The mounting mechanism includes a positioning portion that positions the mounting member with respect to the projecting portion when engaging the second engaging portion of the mounting member with the first engaging portion of the projecting portion. The air cleaner according to any one of claims 1 to 4, characterized in that

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