JP2004293305A - Intake device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake device usable even under a service condition such as foreign matter sticks to a porous member, and capable of inexpensively maintaining reduction in intake noise. <P>SOLUTION: This intake device has the porous member for covering an opening bored in a part of an intake passage part, and communicating the inside and outside, and a sound insulating wall for insulating a transmission sound transmitting through the porous member. At least the porous member is detachably installed in the intake passage part. Even when blocking-up of a pore is caused in the porous member, at least the porous member can be replaced, and can be used in various environments, and maintenance cost of the intake device can be reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an intake device as a passage for supplying air to an engine, and more particularly, to an intake device in which noise during intake is reduced.
[0002]
[Prior art]
In the intake system of the engine, the intake air taken in from the inlet is supplied to the engine body through an intake passage connecting the inlet to the engine body. The intake passage is provided with an intake duct that is continuous with the inlet. In addition, various intake members such as an air cleaner, an air cleaner hose, a throttle body, and an intake manifold are generally disposed in the intake passage together with the intake duct, and these various intake members also constitute a part of the intake passage. ing.
[0003]
Here, in this intake device, noise occurs in the intake passage during intake. Since this noise leaks from the inlet to the outside of the intake device and propagates into the vehicle interior or exterior, various means have been developed to reduce the intake noise.
[0004]
As means for reducing intake noise, it is known to provide an opening in a part of an intake passage and cover the opening with a porous member (for example, Patent Document 1).
[0005]
As shown in Patent Document 1, intake noise is reduced by forming an opening in the bottom wall surface of an air cleaner constituting a part of an intake passage and integrally covering the opening with a porous member. Is believed to be due to a synergistic effect of the following actions.
{Circle around (1)} Due to the vibration damping action caused by the elasticity of the porous member, the generation of sound waves due to the vibration of the intake passage is suppressed.
(2) The energy of the sound wave that has entered the pores of the porous member is weakened by the action of the viscosity and heat conduction of the pores, and the sound energy is attenuated due to the pores resonating with the fluctuation of the sound pressure. .
{Circle around (3)} Since at least a part of the intake passage has a certain degree of air permeability, a part of the sound wave passes through the intake passage to suppress the generation of a standing wave.
[0006]
Here, in the case where the opening is integrally covered with the porous member, it is possible to reduce the resonance noise of the intake duct as described above. Sound may be transmitted. The present applicant has found that the sound transmission wall can be shielded by disposing a sound insulation wall facing the opening covered with the porous member (for example, Patent Documents 2 and 3).
[0007]
As shown in Patent Literatures 2 and 3, the provision of the sound insulation wall makes it possible to block the transmitted sound transmitted through the porous member, so that the intake noise is further reduced.
[0008]
However, in any of the cases described above, if foreign matter adheres to the porous member, the pores of the porous member are blocked, and thus the intake noise reduction effect resulting from disposing the porous member is sufficiently high. There was a problem that was not exhibited. In this case, in order to provide the intake device with the intake noise reduction effect again, it is necessary to replace the portion of the intake device where the porous member is provided. However, the conventional intake devices as disclosed in Patent Documents 2 and 3 have a problem that the volume of a portion to be replaced becomes large and maintenance cost required for the intake device becomes high.
[0009]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 2002-21660 [Patent Document 2]
Japanese Patent Application No. 2002-141978 [Patent Document 3]
Japanese Patent Application No. 2002-200361 [0010]
[Problems to be solved by the invention]
The present invention has been made in consideration of the above circumstances, and is intended to provide an intake device that can be used even under use conditions in which foreign matter adheres to a porous member and can continuously reduce intake noise at low cost. The purpose is to provide.
[0011]
[Means for Solving the Problems]
The intake device according to the present invention includes an intake passage portion serving as an intake passage from the outside air introduction port to the engine body, an opening formed in a part of the intake passage portion to communicate the inside and outside, and a porous material covering the opening. A member, and a sound insulation wall disposed opposite to the opening covered with the porous member and blocking sound transmitted through the porous member, and at least the porous member is provided with respect to the intake passage portion. It is characterized by being detachably attached.
[0012]
Since at least the porous member can be attached to and detached from the intake passage portion, when the pores of the porous member are closed, at least the porous member can be removed and replaced with a new porous member. Maintenance costs can be reduced as compared with replacing the entire intake passage.
[0013]
In the intake device of the present invention, the porous member and the sound insulating wall may be formed integrally.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
The intake device of the present invention has an intake passage portion serving as an intake passage from an outside air inlet to the engine body. In the present invention, various intake members such as an intake duct, a resonator, an air cleaner, an air cleaner hose, a throttle body, and an intake manifold can be appropriately selected and disposed in the intake passage portion. According to the intake device of the present invention, since the intake noise is reduced as will be described later, it is only necessary to dispose a resonator or to provide a small one.
[0015]
In the intake device of the present invention, an opening is formed in a part of the intake passage. The opening is provided so as to communicate between the inside and the outside of the intake passage portion, and serves as a discharge opening for releasing intake noise generated inside the intake passage portion to the outside of the intake passage portion, and also generates a standing wave derived from the above-described opening. An inhibitory action is exerted. This opening is covered with a porous member. Since the opening is covered with the porous member, foreign substances are prevented from entering the inside of the intake passage from the outside of the opening through the opening, and the above-described porous member exhibits the above-described vibration damping action, energy damping action, and the like. The transmitted sound emitted outside the opening is reduced.
[0016]
As the porous member, fibers formed of various materials, such as fibers, filter paper, and foams, can be appropriately selected and used, but nonwoven fabric, woven fabric, or knitted fabric formed of thermoplastic fibers can be used. Is particularly desirable. Thermoplastic resin fibrous nonwoven fabrics and the like can be easily formed by a method such as hot press molding. Therefore, even when the intake passage section has a complicated shape and the opening shape is curved accordingly, the shape of the porous member can be easily formed into a shape corresponding to the opening shape. , Can easily be adapted to the opening shape. The entire nonwoven fabric or the like may be formed of thermoplastic resin fibers, or only a part thereof may be formed of thermoplastic resin fibers. For example, even a non-woven fabric or the like formed by impregnating a non-thermoplastic fiber with a binder of a thermoplastic resin can be shaped by hot press molding or the like as in the case of forming the whole with a thermoplastic resin. is there.
[0017]
Further, in order to suppress a change in the thickness and characteristics of the porous member due to aging or intrusion of moisture, the porous member desirably has a predetermined function such as weather resistance and water repellency. The application of the predetermined function is performed by forming the entire porous member with a material for performing the predetermined function, or providing a functional layer formed of a material for performing the predetermined function on at least a part of the porous member. Can be done at
[0018]
In the intake device according to the present invention, the sound insulation wall is disposed so as to face the opening covered with the porous member. The sound-insulating wall blocks sound transmitted through the porous member. Generally, it is said that the transmitted sound should be increased in order to reduce the intake sound. However, the noise generated in the intake system does not consist only of the intake sound, and the transmitted sound also contributes to the intake noise.
[0019]
In the intake device of the present invention, since the sound insulating wall is disposed opposite to the opening covered by the porous member, the sound transmitted through the porous member and emitted to the outside from the inside of the intake passage portion is transmitted by the sound insulating wall. Because it is blocked, the effect of reducing the transmitted sound of the intake noise can be obtained.
[0020]
Here, the sound insulation wall may be simply a plate-shaped member, and may be arranged so as to cover the outside of the intake passage at the opening covered with the porous member while being separated from the porous member. Alternatively, the porous member may be formed in a substantially cylindrical shape and arranged outside the porous member so as to house the porous member inside the cylinder. The shape is not limited to this as long as it faces the opening covered with the porous member on the outside of the intake passage, and various shapes can be used.
[0021]
When the sound insulation wall is formed in a substantially cylindrical shape, a lid having a small hole may be provided at an end of the sound insulation wall opposite to the opening and apart from the porous member. In this case, it is possible to prevent the porous member from being directly exposed to the outside air, to reduce the possibility of foreign matter adhering to the porous member and block the pores, and to obtain an effect of better reducing transmitted sound. Can be The size of the small hole provided in such a lid portion is desirably about φ3 to φ10 in consideration of reducing transmitted sound and preventing entry of foreign matter from the small hole. The number of small holes can be appropriately set according to the required air permeability from the inside of the cylinder to the outside.
[0022]
Further, instead of providing the lid, a reduced diameter portion whose inner diameter is reduced may be provided on the end side of the cylindrical sound insulating wall, or the lid or the reduced diameter portion may not be provided. In the case where the outside or the reduced diameter portion is not provided, the sound transmitted through the porous member is formed by forming the opening end of the sound insulation wall, which is the most distant from the opening, sufficiently away from the porous member. Can be reduced. By forming the porous member and the opening end of the sound insulating wall to be sufficiently separated from each other, the distance between the porous member and the opening end becomes sufficient to attenuate transmitted sound.
[0023]
Such a sound insulating wall is preferably formed of a resin material such as polypropylene or polyethylene. This is because a desired shape can be easily and inexpensively formed by a method such as blow molding or injection molding.
[0024]
In the intake device of the present invention, at least the porous member is detachably attached to the intake passage portion.
[0025]
In the intake device of the present invention, by making the porous member detachable from the intake passage portion, it is possible to replace at least the porous member, for example, when the pores of the porous member are closed. Become. Therefore, according to the intake device of the present invention, when the pores of the porous member are closed, at least the porous member can be replaced to provide the intake device with the effect of reducing intake noise again, and the entire intake passage portion is replaced. Since there is no need to perform this operation, it is possible to reduce the maintenance cost required for the intake device.
[0026]
And, in the intake device of the present invention, since at least the porous member is detachable as described above, it can be favorably used even under use conditions in which foreign matter adheres to the porous member. Become.
[0027]
Here, at least that the porous member is detachable means that not only the porous member but also other members may be detachable. When other members can be detached, for example, the porous member and the sound insulating wall can be formed integrally or separately so that both the porous member and the sound insulating wall can be detached from the intake passage portion. Also, a part of the intake passage portion provided with the opening and the porous member are formed integrally or separately from each other, and the part of the intake passage portion and the porous member are detachably attached to the intake passage portion main body. It can be possible. Further, all of the porous member, the sound insulating wall, and a part of the intake passage may be detachable from the intake passage main body. When the porous member is formed integrally with a part of the sound insulating wall or the intake passage portion, which is another member, the porous member having low rigidity can be stably held, so that the sealing property with respect to the opening of the porous member is achieved. Is improved. In any case, since the volume of the portion to be replaced can be small, the maintenance cost required for the intake device is greatly reduced. Further, as a part of the intake passage portion which can be attached to and detached from the intake passage portion main body, individual intake members such as an intake duct, an air cleaner, and an air cleaner hose can be selected, or a part of these intake members can be selected. You can also select only.
[0028]
Attachment of the porous member or other members to the intake passage portion can be performed by a known attachment method that enables detachment. In addition, for example, a mounting portion for performing engagement, screwing, and the like can be separately provided. Furthermore, in order to further improve the adhesiveness at the time of attachment, a sealing material can be disposed on a detachable surface between the porous member or another detachable member and the intake passage portion main body. It is desirable to use a single-cell urethane foam or EPDM foam as the sealing material.
[0029]
In the present invention, the opening corresponds to the position corresponding to the antinode of the resonance sound of the intake duct, the position corresponding to the antinode of the resonance sound of the standing wave in the intake passage, or the position where the sound pressure of a low frequency of about 50 to 120 Hz becomes high. To a desired position. Such an opening can be provided in, for example, an intake duct, an air cleaner, an air cleaner hose, or the like.
[0030]
The larger the area in which the openings are arranged, the greater the effect of reducing the intake noise. However, since the porous member covering the opening is an expensive member, it is preferable to provide a small arrangement area of the transmission port in order to reduce the material cost of the intake device. Therefore, in the present invention, the arrangement area of the transmission port is appropriately set in consideration of the manufacturing cost, the maintenance cost, and the intake sound.
[0031]
Further, the opening, the porous member and the sound insulating wall can be provided at one place or at a plurality of places. When provided at a plurality of locations, the noise can be more reliably suppressed by simultaneously providing them at various positions having the above-described noise suppression effect in the intake passage portion.
[0032]
When an air cleaner is provided as a part of the intake passage portion, the opening can be provided on the intake upstream side (so-called dirty side) of the air purifying element, or on the intake downstream side (so-called clean side) of the element. It can also be provided. When the opening is provided on the clean side, the air permeating the porous member covering the opening is purified by the element, so that the life of the porous member can be further extended. If an opening is provided on the dirty side, even if air enters the inside of the intake passage through the opening, the air that has entered the intake passage will be purified by the element, and the air supplied to the engine will be more reliable. It is possible to maintain a very clean state. ADVANTAGE OF THE INVENTION According to this invention, since a porous member is detachable at least, when a pore closure | blocking arises, a porous member can be replaced easily and cheaply.
[0033]
In the intake device of the present invention, the porous member and the sound insulating wall may be formed integrally. As a method of integrally forming the porous member and the sound insulating wall, there is a method in which the porous member and the sound insulating wall are separately formed, and then integrated by a known method such as welding, bonding, or fitting. Further, the other member can be integrally molded with one member molded in advance by a method such as insert molding.
[0034]
Here, if the porous member is not securely attached to the intake passage, intake noise may be generated due to vibration of the porous member itself. For this reason, it is more preferable that the porous member is formed integrally with the sound insulating wall or the intake passage. When the porous member is formed integrally with a part of the sound insulating wall or the intake passage, the relatively soft porous member can be held by a relatively hard part of the sound insulating wall or the intake passage. Attachment and removal of the porous member to and from the opening can be performed easily and reliably.
[0035]
In the intake device of the present invention, the porous member and the sound insulating wall can be disposed so as to protrude outside the intake passage portion, or can be disposed inside the intake passage portion. In any case, the opening is covered by the porous member, and the sound insulation wall is disposed opposite to the opening covered by the porous member, so that an intake sound reduction effect and a transmission sound reduction effect are obtained, Intake noise is reduced.
[0036]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
(Example 1)
The intake device according to the first embodiment of the present invention constitutes an intake system of an automobile, and is an example in which a porous member and a sound insulating wall are provided in an air cleaner that constitutes a part of an intake passage. FIG. 1 is a schematic path diagram of the intake device of the first embodiment, and FIG. 2 is an exploded cross-sectional view of the intake passage portion, the porous member, and the sound insulating wall along AA ′ in FIG.
[0037]
In the intake device 1 of the first embodiment, an air cleaner 3 is provided as a part of the intake passage 2. Therefore, in the intake device 1 of the first embodiment, the intake of the intake air toward the engine body is performed through the following route. First, the intake air introduced into the intake passage 2 from the inlet 5 passes through the intake duct 6 and enters the air cleaner 3. The intake air advances in the order of the dirty side 7 → the element 8 → the clean side 10 in the air cleaner 3 and passes through the air cleaner 3. The intake air that has passed through the air cleaner 3 enters an air cleaner hose 11 that is continuous with the air cleaner 3, and enters an intake manifold 13 via a throttle body 12. The air that has entered the intake manifold 13 is introduced into the engine body through a port 15 that is a boundary between the intake manifold 13 and an engine body (not shown). In this embodiment, the path from the inlet 5 to the port 15 is constituted by the intake passage 2.
[0038]
In the intake device 1 according to the first embodiment, the porous member 16 and the sound insulating wall 17 are provided in the air cleaner 3. A substantially circular opening 18 is provided on the dirty side 7 of the air cleaner 3, and a substantially cylindrical peripheral wall portion 21 is formed such that a peripheral edge portion 20 of the opening 18 projects outward of the air cleaner 3. Engaging claws 23 projecting outward from the peripheral wall portion 21 are formed at two predetermined positions on the outer surface 22 of the peripheral wall portion 21, and substantially at predetermined positions separated from the engaging claws 23. A sealing material 25 is attached so as to make a round around the outer surface 22 of the cylindrical peripheral wall portion 21. The sealing material 25 is formed of a urethane foam. A sound insulating wall 17 and a porous member 16 described later are attached to the peripheral wall portion 21.
[0039]
In the first embodiment, the porous member 16 and the sound insulating wall 17 are formed separately and then welded and integrated. The porous member 16 is made of a non-woven fabric made of PET, and is cut and formed into a substantially circular shape larger than the opening 18. The sound insulation wall 17 is formed by blow molding using PP as a material, and has a substantially cylindrical shape having an inner surface 26 slightly larger in diameter than the outer surface 22 of the peripheral wall portion 21. In the sound insulation wall 17, an engagement groove 27 having a shape corresponding to the engagement claw 23 is formed on an inner surface 26 of the base 24 which is an attachment end to the peripheral wall. Further, slits (not shown) are provided at predetermined intervals on the distal end side 19 of the base 24.
[0040]
The portion of the sound insulating wall 17 from the portion facing the end portion 28 of the peripheral wall portion 21 to the protruding end 30 has a shape slightly smaller in diameter than the base portion 31 attached to the peripheral wall portion 21. 30 is provided with a lid 33 having a small hole 32 formed therein. An outer edge 35 of the porous member 16 is welded to the inner surface 26 of the cylindrical sound insulating wall 17 at a position facing the end 28 of the peripheral wall portion 21, and the welding causes the porous member 16 and the sound insulating wall 17 to be integrated. Has been
[0041]
In the first embodiment, the sound insulation wall 17 is attached to the air cleaner 3 by the engagement of the engagement groove 27 of the sound insulation wall 17 with the engagement claw 23 of the peripheral wall portion 21. At this time, after the base 24 is once expanded by widening the slit, the peripheral wall 21 is inserted into the base 24, and the base 24 is reduced in diameter again, whereby the mounting is performed.
[0042]
When removing the sound insulating wall 17 from the peripheral wall 21, the peripheral wall 21 can be removed from the base 24 by opening a slit with a tool such as a screwdriver and expanding the diameter of the base 24.
[0043]
In the intake device 1 according to the first embodiment, the sound insulating wall 17 and the porous member 16 integrated with the sound insulating wall 17 are detachably attached to the air cleaner 3 forming a part of the intake passage portion 2. Therefore, when the pores of the porous member 16 are closed or the like, the porous member 16 and the sound insulating wall 17 can be removed from the intake passage portion 2 and replaced with a new porous member 16 and a new sound insulating wall 17. Since only the porous member 16 and the sound insulating wall 17 are replaced instead of the entire intake passage section 2, the maintenance cost of the intake device 1 is significantly reduced. Further, since the porous member 16 and the sound insulating wall 17 are integrated, the attachment of the porous member 16 to the intake passage 2 can be made easy and reliable.
[0044]
(Example 2)
The intake device according to the second embodiment of the present invention is the same as the intake device according to the first embodiment except for the method of attaching the peripheral wall and the sound insulating wall. FIG. 3 is a cross-sectional view of the intake passage portion, the porous member, and the sound insulating wall at a position corresponding to AA ′ in FIG. 1 in the intake device of the second embodiment.
[0045]
In the intake device according to the second embodiment, the opening 37 is provided on the dirty side 40 of the air cleaner 38 as in the first embodiment, and the peripheral portion 41 of the opening 37 has a substantially cylindrical peripheral wall protruding outward from the air cleaner 38. The part 42 is formed. In the second embodiment, the sound insulating wall 43 is inserted and attached inside the cylinder of the peripheral portion 41. The sound insulation wall 43 is formed in the same shape as that of the first embodiment except that the engagement groove is not provided, and the outer edge 47 of the porous member 46 is welded to the inner surface 45 of the same as in the first embodiment. Further, the same sealing material 50 as in the first embodiment is attached to the outer surface 48 of the sound insulating wall 43. In the second embodiment, after inserting the sound insulation wall 43 into the cylinder of the peripheral portion 41, the outer surface 48 of the peripheral wall portion 42 is fastened by the substantially ring-shaped fastener 51 so that the porous member 46 and the sound insulation wall 43 Was detachably attached to the air cleaner 38.
[0046]
According to the intake device 36 of the second embodiment, since the porous member 46 and the sound insulation wall 43 are detachably attached to the air cleaner 38 that constitutes a part of the intake passage, the same as in the first embodiment. The maintenance cost of the intake device can be significantly reduced. Furthermore, since the porous member 46 and the sound insulation wall 43 are integrated, the attachment of the porous member 46 to the intake passage can be made easy and reliable as in the first embodiment.
[0047]
(Example 3)
The intake device according to the third embodiment of the present invention is the same as the first embodiment except that the porous member is separate from the sound insulating wall and the shape of the sound insulating wall is different. FIG. 4 is a cross-sectional view of the intake passage portion, the porous member, and the sound insulation wall at a position corresponding to AA ′ in FIG. 1 in the intake device of the third embodiment.
[0048]
In the intake device according to the third embodiment, the shape of the peripheral wall portion 56 is formed in the same shape as the peripheral wall portion of the first embodiment. The base 58 of the sound insulating wall 57 attached to the peripheral wall 56 is also formed in the same shape as the base of the first embodiment. The protruding end 60 of the sound insulating wall 57 is formed so as to be smaller in diameter than a portion of the sound insulating wall 57 that faces the end 61 of the peripheral wall portion 56, thereby forming a reduced diameter portion 62.
[0049]
Further, the arrangement position of the porous member 63 with respect to the sound insulation wall 57 is the same as that of the first embodiment. However, in the third embodiment, the porous member 63 is formed separately from the sound insulation wall 57 and the end 61 of the peripheral wall portion 56 is formed. And the inside 65 of the cylinder of the sound insulation wall 57. Therefore, when the porous member 63 is replaced, the sound insulating wall 57 and the porous member 63 can be removed from the air cleaner 67 forming a part of the intake passage portion, and the sound insulating wall 57 once removed together with the new porous member 63 can be attached again.
[0050]
Therefore, in the third embodiment, since only the porous member 63 needs to be replaced, the maintenance cost of the intake device is further reduced.
[0051]
(Example 4)
In the intake device according to the fourth embodiment of the present invention, the porous member and the sound insulation wall are formed integrally with the intake duct. FIG. 5 is a perspective view showing an intake duct, an air cleaner, and a sound insulation wall of the intake device of the fourth embodiment. FIG. 5 is an enlarged cross-sectional view of main parts of the intake duct, the air cleaner, and the sound insulation wall in the intake air flow direction BB ′ in FIG. 6 is shown.
[0052]
In the intake device of the fourth embodiment, a substantially circular attachment port 73 for detachably attaching an intake duct 72 is provided on the dirty side 71 of the air cleaner 70. An outer edge portion 75 of the mounting port 73 is a peripheral wall portion 76 protruding outward from the air cleaner 70. The inside of the peripheral wall portion 76 is partitioned by a partition wall 77 into a substantially half-moon shape. One of the partitioned attachment ports 73 is an intake port 78 that communicates with the inside of the intake duct 72 and forms a part of an intake path. The other is an opening 81 that communicates with the inside of the sound insulation wall 80 formed integrally with the intake duct 72. Further, engaging claws 82 are provided on the outer surface 84 of the peripheral wall portion 76 so as to protrude outward from the peripheral wall portion 76 at two predetermined positions.
[0053]
A substantially cylindrical sound insulation wall 80 is provided in a mounting portion 83 of the intake duct 72 that is attached to the air cleaner 70 in parallel with the main body of the intake duct 72. The end of the sound insulating wall 80 opposite to the mounting portion 83 is a protruding end 88 that protrudes toward the inlet 85 side of the intake duct 72 and is covered by a lid 87 having a small hole 86. Further, a porous member 91 made of the same material as the porous member of the first embodiment is welded to the base 90 at the end of the sound insulation wall 80 which is located on the attachment portion 83 side of the intake duct 72. Further, the mounting portion 83 and the base portion 90 of the sound insulation wall 80 each have a substantially half-moon shape and are integrated into a cylindrical shape having a substantially circular cross section.
[0054]
The intake duct 72 and the sound insulation wall 80 integrated with the intake duct 72 are attached to the attachment port 73. At this time, the intake port 78 and the intake duct 72 are arranged to face each other, and the opening 81 and the base 90 of the sound insulation wall 80 are arranged to face each other. Note that engagement grooves are provided on the inner wall of the intake duct 72 and the inner wall of the sound insulation wall 80 at positions facing the engagement claws 82, respectively. Therefore, the intake duct 72 and the sound insulating wall 80 can be attached to and detached from the mounting opening 73 of the air cleaner 70 by the engagement of the engaging claw 82 of the peripheral wall portion 76 with the engaging claw 82 of the intake duct 72 and the sound insulating wall 80. ing.
[0055]
In the fourth embodiment, an intake duct 72 which is a part of an intake passage is detachably attached to an air cleaner 70 which is a part of an intake passage. Further, a sound insulation wall 80 is provided integrally with the intake duct 72. Further, a porous member 91 is provided integrally with the sound insulating wall 80. Therefore, according to the intake device of the fourth embodiment, when the porous member 91 is replaced, both the intake duct 72 and the sound insulation wall 80 are replaced. However, even when the intake duct 72 and the sound insulation wall 80 are replaced together with the porous member 91, the cost required for replacement is far reduced as compared with the case where the entire intake passage including the expensive air cleaner 70 and the like is replaced.
[0056]
【The invention's effect】
As described above, according to the intake device of the present invention, since the porous member for reducing the intake noise can be attached to and detached from the intake passage, the porous member can be replaced. Therefore, reduction of intake noise can be continued by this replacement. Further, since the volume of the part to be replaced can be small, the replacement can be performed at low cost, so that the maintenance cost of the intake device can be reduced. Further, since the replacement of the porous member can be performed at a low cost, the porous member can be suitably used even under use conditions in which foreign matter adheres to the porous member.
[Brief description of the drawings]
FIG. 1 is a schematic path diagram of an intake device according to a first embodiment of the present invention.
FIG. 2 is an exploded cross-sectional view of an intake passage, a porous member, and a sound insulation wall taken along line AA ′ in FIG.
FIG. 3 is a cross-sectional view of an intake passage, a porous member, and a sound insulating wall in a position corresponding to AA ′ in FIG. 1 in the intake device according to the second embodiment of the present invention.
FIG. 4 is a cross-sectional view of an intake passage, a porous member, and a sound insulating wall at a position corresponding to AA ′ in FIG. 1 in the intake device according to the third embodiment of the present invention.
FIG. 5 is a perspective view illustrating an intake duct, an air cleaner, and a sound insulating wall in an intake device according to a fourth embodiment of the present invention.
6 is an enlarged cross-sectional view of a main part of an intake duct, an air cleaner, and a sound insulation wall in an intake flow direction BB ′ in FIG. 5;
[Explanation of symbols]
1: Intake device 2: Intake passage 3: Air cleaner 5: Inlet 6: Intake duct 7: Dirty side 8: Element 10: Clean side 11: Air cleaner hose 12: Throttle body 13: Intake manifold 15: Port 16: Porous Member 17: Sound insulation wall 18: Opening 37: Opening 43: Sound insulation wall 46: Porous member 57: Sound insulation wall 63: Porous member 81: Opening 80: Sound insulation wall 85: Inlet 91: Porous member

Claims (2)

An intake passage portion serving as an intake passage from the outside air introduction port to the engine body, an opening formed in a part of the intake passage portion and communicating between the inside and outside, a porous member covering the opening, and the porous member Having a sound insulation wall disposed opposite to the opening covered with and blocking transmitted sound transmitted through the porous member,
At least the porous member is detachably attached to the intake passage portion. The intake device according to claim 1, wherein the porous member and the sound insulating wall are formed integrally.

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