WO2011155437A1 - 吸気ダクト - Google Patents
吸気ダクト Download PDFInfo
- Publication number
- WO2011155437A1 WO2011155437A1 PCT/JP2011/062924 JP2011062924W WO2011155437A1 WO 2011155437 A1 WO2011155437 A1 WO 2011155437A1 JP 2011062924 W JP2011062924 W JP 2011062924W WO 2011155437 A1 WO2011155437 A1 WO 2011155437A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- holding
- conduit body
- holding member
- intake duct
- shielding member
- Prior art date
Links
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- 230000035699 permeability Effects 0.000 claims description 10
- 238000009423 ventilation Methods 0.000 claims description 6
- 210000000078 claw Anatomy 0.000 description 35
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- 230000001629 suppression Effects 0.000 description 3
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- 238000011038 discontinuous diafiltration by volume reduction Methods 0.000 description 2
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- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
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- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 239000006260 foam Substances 0.000 description 1
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- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
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Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1205—Flow throttling or guiding
- F02M35/1216—Flow throttling or guiding by using a plurality of holes, slits, protrusions, perforations, ribs or the like; Surface structures; Turbulence generators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/10—Air intakes; Induction systems
- F02M35/10091—Air intakes; Induction systems characterised by details of intake ducts: shapes; connections; arrangements
- F02M35/10144—Connections of intake ducts to each other or to another device
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1205—Flow throttling or guiding
- F02M35/1238—Flow throttling or guiding by using secondary connections to the ambient, e.g. covered by a membrane or a porous member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/12—Intake silencers ; Sound modulation, transmission or amplification
- F02M35/1288—Intake silencers ; Sound modulation, transmission or amplification combined with or integrated into other devices ; Plurality of air intake silencers
Definitions
- the present invention relates to an intake duct disposed in an intake portion of an engine in a vehicle.
- Patent Document 1 proposes an intake duct that reduces an intake sound caused by air column resonance by providing an opening in the middle of the exhalation duct body and covering the opening with a sheet member of heat-shrinkable fiber. is doing.
- the air intake duct of Patent Document 1 is a sheet member that covers the opening by inserting the duct body into a cylindrical sheet member formed slightly larger than the duct body and applying heat to thermally contract the sheet member. Is attached to the duct body.
- the intake duct of Patent Document 1 needs to be heated when the seat member is assembled. Therefore, a heating apparatus is required for the production facility, and the assembly process of the sheet member is complicated.
- Patent Document 1 since the entire air intake duct of Patent Document 1 is exposed to the outside, excessive care is required so as not to damage the seat member when assembling to the vehicle, and handling at the time of assembling is difficult. In addition, since the sheet member is held only by its contraction force, the sheet member is easily displaced from the duct body and may be detached during use.
- the present invention has been made in view of the above problems, and it is an object of the present invention to provide an intake duct to which a shielding member can be easily attached.
- the present invention provides the following. (1) A conduit body having an air flow passage communicating from one end to the other end and a vent hole communicating outward from the air flow passage; A shielding member having air permeability and arranged to cover the vent hole; A holding member that extends along an outer peripheral surface or an inner peripheral surface of the conduit body and fixes the shielding member to the conduit body; The said holding member hold
- the air intake duct characterized by the above-mentioned.
- the shielding member can be easily attached to the conduit body in a state of covering the vent hole only by being held by the holding member. Further, the intake duct holds the shielding member with the holding member, so that the shielding member is not easily displaced, and the shielding member can be protected by the holding member.
- the holding member extends in a circumferential direction of the air flow passage of the conduit body, At least one end in the circumferential direction of the holding member is provided with a locking portion,
- the intake duct according to any one of (1) to (3), wherein the conduit body is provided with a locked portion to which the locking portion is locked.
- the holding member can be attached to the conduit body with a simple configuration.
- a hinge portion is provided at the other circumferential end of the holding member,
- the holding member is rotatable with respect to the conduit body about the hinge portion as a rotation center,
- the holding member can be attached to the conduit body with a simple configuration, and the number of parts can be reduced.
- the holding member is provided with an opening at a position corresponding to the vent hole of the conduit body,
- the holding member includes a pair of holding portions provided to face each other across the opening,
- the intake duct according to any one of (1) to (5), wherein the pair of holding portions press the shielding member against the conduit body so that tension is applied to the shielding member.
- One end in the circumferential direction of the holding member is rotatably attached to the conduit main body, and is closer to the rotation center of the holding member among the pair of holding portions as the holding member rotates.
- the holding member is rotated so that the one holding portion first presses the shielding member against the conduit body and the other holding portion applies tension to the shielding member. Therefore, it is possible to hold the shielding member on the conduit body in a state in which tension is applied to the shielding member only by rotating the holding member.
- the holding portion is a protrusion protruding from the holding member toward the conduit body,
- the intake duct according to (8) wherein the holding portion on the side close to the rotation center of the holding member has a projection height higher than that of the holding portion on the side far from the rotation center of the holding member.
- the holding member is provided with an opening at a position corresponding to the vent hole of the conduit body, A holding portion is provided on an outer periphery of the opening of the holding member; A holding receiving portion corresponding to the holding portion is provided on the outer periphery of the vent hole of the conduit body,
- the intake duct according to any one of (1) to (5), wherein the holding portion and the holding receiving portion are held with the shielding member interposed therebetween, and tension is applied to the shielding member.
- tension can be applied to the shielding member in the region corresponding to the vent hole, deformation of the shielding member at the vent hole portion can be suppressed, and noise in the intake duct can be effectively suppressed. can do.
- FIG. 1 It is a schematic perspective view which shows the intake duct which concerns on 1st Embodiment of this invention. It is a schematic perspective view which shows the air intake duct shown in FIG. 1 in the state which removed the shielding member and the holding member. It is a principal part perspective view of the air intake duct shown in FIG. 1, Comprising: It fractures
- FIG. 6 It is sectional drawing of the air intake duct shown in FIG. 6, Comprising: It shows in the state which removed the shielding member and the holding member. It is sectional drawing which shows the air intake duct which concerns on 3rd Embodiment of this invention. It is sectional drawing of the air intake duct shown in FIG. 8, Comprising: It shows in the state which removed the shielding member and the holding member. It is a perspective view which shows the air intake duct which concerns on 4th Embodiment of this invention. It is sectional drawing of the air intake duct shown in FIG. It is sectional drawing of the air intake duct which concerns on the 1st modification of 4th Embodiment of this invention.
- FIG. 16 is an enlarged cross-sectional view of a main part of the intake duct shown in FIG. 15. It is a principal part expanded sectional view of the air intake duct which concerns on a reference example. It is sectional drawing which shows the air intake duct which concerns on 6th Embodiment of this invention.
- the intake duct 10 includes a tubular conduit body 12 having a vent hole 28, a shielding member 32 that covers the vent hole 28, and the shielding member 32 fixed to the conduit body 12. Holding member 34.
- An air flow passage 14 is formed inside the conduit body 12 (see FIG. 3), and an inlet 12a is provided at one end and an outlet 12b is provided at the other end.
- the intake duct 10 is installed in the engine room of the vehicle so that the inlet 12a of the conduit body 12 faces the outside of the vehicle and the outlet 12b of the conduit body 12 is connected to a device such as an air cleaner.
- the conduit body 12 is a substantially cylindrical member.
- the conduit body 12 is configured by combining a first half body 16 having a semicircular cross section and a second half body 18 having a semicircular cross section.
- the first half 16 and the second half 18 are made of a synthetic resin such as polypropylene (PP) or polyethylene (PE), and are airtight members formed by injection molding or the like.
- flanges 16 a and 18 a extending outward in the radial direction are formed along the longitudinal direction.
- the conduit main body 12 is assembled by abutting and joining the flanges 16a, 18a of the first half 16 and the second half 18.
- the flange portions 16a and 18a are joined by a technique such as vibration welding, adhesion with an adhesive, mechanical fastening with rivets, bolts, or the like.
- the flange portions 16a and 18a joined to each other form a flange portion 20 extending in the longitudinal direction.
- the flange portion 20 is formed at two locations separated in the circumferential direction. That is, the intake duct 10 is provided with two flange portions 20 and 20 that are symmetrical with respect to the air flow passage 14.
- the conduit body 12 is provided with a vent hole 28 that communicates outward from the air flow passage 14 (see FIG. 2).
- the vent hole 28 is circular (see FIG. 2 or FIG. 3), and its diameter is preferably set in the range of 5 mm to 16 mm. Further, as shown, all the vent holes 28 may be set to the same size.
- a plurality of (four in the illustrated example) vent holes 28 are spaced apart to form a set of openings 26. As shown in the figure, a plurality of sets (three sets in the embodiment) may be provided apart from each other in the longitudinal direction, or only one set may be provided.
- the plurality of vent holes 28 constituting each opening set 26 are arranged on the peripheral surface of the conduit body 12 so that the center line lengths from the inflow port 12a are the same. Specifically, the plurality of vent holes 28 are arranged so that the centers (centers of gravity) of the circular vent holes 28 are aligned in the circumferential direction in each opening set 26.
- the center line C of the conduit body 12 refers to an imaginary line along the longitudinal direction passing through the center of the air flow passage 14.
- the center line length is the length of the center line C (see FIG. 1).
- the vent hole 28 is formed only in the first half body 16, and the opening set 26 is provided in the first half body.
- the conduit body 12 has three sets (at least two sets) of opening sets 26A, 26B, and 26C.
- the first opening set 26A is provided at a position that is 1 ⁇ 2 of the center line length from the inflow port 12a to the outflow port 12b.
- the second opening set 26B is at a position half the center line length from the inlet 12a to the first opening set 26A
- the third opening set 26C is the center line length from the inlet 12a to the second opening set 26B. Of 1/2.
- the intake duct 10 is provided with at least one opening set 26 ⁇ / b> A at a position that is 1 ⁇ 2 of the total length of the center line in the conduit body 12. Furthermore, another opening set 26B (26C) is disposed at an intermediate position between the inlet 12a and the opening set 26A (26B) closest to the inlet 12a. In this way, the aperture groups 26A to 26C (air vents 28) are located at positions where the phase of air column resonance overlaps and the sound pressure level increases, such as 1/2, 1/4, 1/8 of the center line of the conduit main body 12. ) Is arranged. Therefore, the intake duct 10 allows the pressure pulsation of the air flow passage 14 to escape to the outside through the vent hole 28 and appropriately attenuates the air column resonance.
- the vent hole 28 is set so that the total opening length in the circumferential direction is in a range of 13% to 67% with respect to the circumferential length of the conduit body 12.
- the opening length in the circumferential direction of the vent hole 28 is a length dimension in the circumferential direction passing through the center of gravity of the vent hole 28, and is the diameter of the vent hole 28 in the illustrated example.
- the total opening length is a value obtained by adding the opening lengths in the circumferential direction of the vent holes 28 constituting the opening set 26.
- the total opening length is a value obtained by adding the diameters of the vent holes 28 constituting the opening set 26. .
- the shielding member 32 is a member having air permeability.
- a foamed material such as urethane foam or rubber having an open cell structure, a porous material such as a resin film having fine pores, an aggregate of fibers such as a nonwoven fabric, a net-like material, or the like.
- a nonwoven fabric having a water repellent treatment on the surface is particularly preferable.
- the nonwoven fabric is preferably made of polyester fiber or polypropylene fiber by a spunbond method or a needle punch method, and its basis weight is preferably set in the range of 30 g / m 2 to 300 g / m 2 .
- the shielding member 32 is set such that the longitudinal and circumferential dimensions are larger than the longitudinal and circumferential dimensions of the vent hole 28, and the shielding member 32 can cover the vent hole 28.
- the circumferential dimension of the shielding member 32 may be set to be substantially the same as the circumferential separation width of the flange portions 20, 20 (a half circumference of the conduit body 12).
- the shielding member 32 is a strip-shaped sheet (see FIG. 2 or FIG. 3).
- the shielding member 32 is arranged on the outer peripheral surface of the conduit body 12 so that the longitudinal side of the shielding member 32 extends in the circumferential direction of the intake duct 10.
- the shielding member 32 arranged in this way is held by the conduit body 12 by the holding member 34 in a state where the vent hole 28 is closed.
- the holding members 34 are attached to positions corresponding to the opening sets 26 of the conduit body 12 (see FIG. 2).
- the holding member 34 is made of a synthetic resin such as polypropylene (PP) or polyethylene (PE), rubber, or the like, and is formed in a strip shape whose longitudinal side extends in the circumferential direction (see FIG. 3).
- the dimension of the short side of the holding member 34 (the dimension in the longitudinal direction of the conduit main body 12) is larger than the dimension of the vent hole 28 in the longitudinal direction, and the dimension of the short side of the shielding member 32 (the dimension in the longitudinal direction of the conduit main body 12). ) Is set larger. Further, the dimension of the longitudinal side of the holding member 34 (dimension in the circumferential direction of the conduit body 12) is set to be equal to or larger than the dimension in the circumferential direction of the shielding member 32. In addition, the dimension of the longitudinal side of the holding member 34 may be set to be substantially the same as the separation width in the circumferential direction of the flange portions 20 and 20 (for the half circumference of the conduit main body 12).
- the holding member 34 is set to a size that can cover all the vent holes 28 constituting the corresponding opening set 26 and larger than the shielding member 32 corresponding to the opening set 26.
- the holding member 34 may be formed in advance along the outer peripheral surface of the conduit body 12.
- the shielding member 32 may be formed of a member having flexibility or elasticity, and may be deformed following the outer peripheral surface of the conduit body 12 when the holding member 34 is attached to the conduit body 12.
- the at least one end of the holding member 34 is detachably attached to the conduit body 12.
- the holding member 34 is formed with an open portion (opening) 36 having a size matching the vent hole 28 of the conduit body 12.
- the open portion 36 is formed at a position facing the vent hole 28 when the holding member 34 is fixed to the outer peripheral surface of the conduit body 12.
- the shielding member 32 corresponding to the vent hole 28 is exposed to the outside via the opening 36, and the vent hole of the shielding member 32 is exposed.
- the portion that is out of the position 28 is held by the holding member 34.
- the shielding member 32 is covered and protected by the holding member 34 except for the portion corresponding to the vent hole 28.
- the opening portion 36 of the holding member 34 does not need to be formed in the same shape as the vent hole 28 and may be formed so as to open at least larger than the vent hole 28.
- the holding member 34 includes a first claw portion (locking portion) 38 at one end portion in the circumferential direction.
- the first claw portion 38 is locked in a first claw hole (locked portion) 22 formed in the flange portion 20.
- the holding member 34 includes a second claw portion 40 at the other end in the circumferential direction.
- claw part 40 engages with the 2nd nail
- the first claw hole 22 and the second claw hole 24 are openings formed through the flange portion 20 and are spaced apart from each other in the circumferential direction.
- the first claw portion 38 and the second claw portion 40 have a tongue piece extending in the circumferential direction from the end portion of the holding member 34 and a direction in which the claw holes 22 and 24 are inserted at the tips of the tongue pieces. And projecting pieces 38a and 40a projecting in a direction intersecting with each other.
- a pair of ribs 30, 30 extending in the circumferential direction are formed in the conduit body 12 with the vent hole 28 interposed therebetween.
- the shielding member 32 is disposed between the pair of ribs 30, 30, and the holding member 34 is fitted so as to face the vent hole 28, whereby the holding member 34 is held on the outer peripheral surface of the conduit body 12 while holding the shielding member 32. (Refer to FIG. 1 or FIG. 3).
- the pair of ribs 30 is provided on the outer peripheral surface of the first half 16 provided with the vent hole 28 so as to extend from one brim 16a to the other brim 16a. Yes.
- the pair of ribs 30, 30 are arranged so that the distance between them is the same as the dimension in the short direction of the holding member 34 (the dimension in the longitudinal direction of the conduit body 12).
- Each rib 30, 30 is formed to protrude from the outer peripheral surface of the conduit body 12 so as to be higher than the thickness of the shielding member 32.
- the air intake duct 10 covers the vent hole 28 of the conduit body 12 with a shielding member 32 having air permeability, so that pressure pulsations in the air flow passage can be released to the outside through the vent hole 28 and the shielding member 32.
- Air column resonance can be attenuated. Thereby, generation
- the vent hole 28 is covered with the shielding member 32, sound leakage from the vent hole 28 can be suppressed as compared with the case where the vent hole 28 is directly exposed to the outside.
- the shielding member 32 is held by a holding member 34 fixed to the conduit body 12. Therefore, unlike the sheet member that is thermally contracted as described in the conventional example, a heating device is not required for attaching the shielding member, and the manufacturing equipment can be simplified. Moreover, since heating is not required for attaching the shielding member 32, deformation of the conduit body 12 and the shielding member 32 can be avoided.
- the shielding member 32 can be held only by fixing the holding member 34 to the conduit body 12, the attaching process of the shielding member 32 can be simplified.
- the holding member 34 can be attached to the conduit body 12 simply by inserting the first and second pawl portions 38 and 40 into the first and second pawl holes 22 and 24 of the conduit body 12, further assembly work efficiency can be achieved. Has been improved.
- the shielding member 32 is securely held by the holding member 34, and its position is difficult to shift. Therefore, the noise suppression effect can be expected stably in the long term regardless of the vibration of the vehicle.
- the outside of the shielding member 32 is covered and protected by a holding member 34 except for a portion corresponding to the vent hole 28. Further, the portion corresponding to the vent hole 28 of the shielding member 32 exposed to the outside is also located radially inward from the outer surface of the holding member 34. Therefore, the shielding member 32 is less likely to be damaged by coming into contact with other members or human hands when the intake duct 10 is transported or attached, or during vehicle maintenance. That is, the holding member 34 not only functions to hold the shielding member 32 but also functions to protect the shielding member 32, so that the displacement or damage of the shielding member 32 can be effectively suppressed.
- the holding member 34 is provided with an opening 36 at a portion corresponding to the vent hole 28 when fixed to the conduit body 12. Therefore, the air permeability of the shielding member 32 is not impaired by the holding member 34. Further, since the conduit body 12 and the holding member 34 sandwich the portion of the shielding member 32 that is out of the vent hole 28, the portion corresponding to the vent hole 28 of the shielding member 32 is not compressed by the holding member 34. That is, it is possible to suppress the air permeability of the shielding member 32 from fluctuating before and after attachment. Therefore, the shielding member 32 can be attached to the conduit body 12 while maintaining the optimum air permeability corresponding to the opening of the vent hole 28, and a desired sound reduction effect and intake performance can be achieved.
- the conduit body 12 is provided with a pair of ribs 30 and 30 with the air vent 28 interposed therebetween, and the position of the conduit body 12 and the holding member 34 is naturally fitted by fitting between the ribs 30 and 30. Since it is fixed, it can be easily attached to the conduit body 12. Further, the shielding member 32 can be easily positioned between the flange portions 20 and 20 by setting the circumferential dimension of the shielding member 32 in accordance with the circumferential spacing of the flange portions 20 and 20.
- the opening set 26 is surrounded by the ribs 30 and 30 and the flange portions 20 and 20, and the shielding member 32 is disposed in the enclosed space. Therefore, it is easy to perform the attaching operation of the holding member 34, and it is possible to avoid attachment failure such as the shielding member 32 being displaced from the vent hole 28. Further, it is possible to avoid a mounting failure in which the holding member 34 is detached from the shielding member 32 or the holding member 34 is displaced from the original position and covers the vent hole 28.
- Example 2 The change of the noise reduction effect due to the opening rate of the vent was verified.
- air intake ducts according to Experimental Examples 1 to 5 in which the vent holes were covered with a nonwoven fabric having a basis weight of 100 g / m 2 were prepared.
- Comparative Example 1 a conduit body similar to that of the experimental example was prepared, but a ventilation hole was not provided, and as Comparative Example 2, a nonwoven fabric that did not block the ventilation hole was prepared.
- the opening area is the total opening area of the ventilation holes.
- the opening length is the total opening length in the circumferential direction of the vent hole.
- Opening ratio is the ratio of the total opening length in the circumferential direction of the vent to the circumference of the conduit body.
- the present invention is not limited to the embodiment described above, and can be modified as follows.
- both end portions that are separated in the circumferential direction are configured to be detachable from the conduit body 12, but only one end portion is detachable. It is good also as a simple structure.
- 6 and 7 are cross-sectional views showing an intake duct 50 according to the second embodiment of the present invention.
- the holding member 52 of the intake duct 50 is rotatably fixed to the flange portion 20 of the conduit body 12 by a hinge portion 56 at the circumferential end.
- the hinge portion 56 is integral with the first half 16 of the conduit body 12.
- the holding member 52 thus configured rotates with respect to the conduit body 12 with the hinge portion 56 as a fulcrum, and holds the shielding member 32 between the holding member 52 and the outer peripheral surface of the conduit body 12 while the hinge portion A claw portion (locking portion) 54 provided on the opposite side to the circumferential direction 56 is locked to the claw hole (locked portion) 22 of the flange portion 20 and held by the conduit body 12.
- the hinge portion 56 is configured to connect the holding member 52 and the first half 16, but the third embodiment shown in FIGS. As in the intake duct 60 according to the embodiment, the hinge portion 56 may be configured to connect the holding member 52 and the second half 18.
- the claw portion 54 of the holding member 52 formed integrally with the second half 18 is engaged with the claw hole 22 provided in the second half 18. Stopped. Therefore, the holding member 52 integral with the second half 18 can press the shielding member 32 and the first half 16 against the second half 18. As a result, it is possible to fix the first half 16 and the second half 18 simultaneously with fixing the shielding member 32 to the first half 16.
- FIG. 10 is a perspective view of an intake duct 70 according to the fourth embodiment of the present invention
- FIG. 11 is a cross-sectional view taken along a plane orthogonal to the longitudinal direction.
- the intake duct 70 according to the fourth embodiment is the same as the intake duct 60 according to the third embodiment.
- the eight air holes 28 constitute a pair of opening sets 26 and further a pair of protrusions (which hold the shielding member 32).
- the holding members 71 and 72 are formed on the holding member 52.
- a plurality of vent holes 28 are arranged in a plurality of rows in the circumferential direction and the longitudinal direction, and these are used as one set of openings 26. In this way, by arranging the plurality of vent holes 28 in a plurality of rows instead of in a row, it is possible to keep both the strength of the conduit body 12 high while ensuring an opening area.
- the holding member 52 covering the vent hole 28 is formed so as to extend along the circumferential direction as in the first to third embodiments.
- One end in the circumferential direction of the holding member 52 is connected to the conduit body 12 via a hinge portion 56, and a claw portion 54 is provided at the other end in the circumferential direction, and is detachably engaged with the claw hole 22 of the conduit body 12. It has been stopped.
- a pair of protrusions 72 projecting toward the conduit body 12 are formed near the hinge portion 56 (near one end in the circumferential direction) and near the claw portion 54 (near the other end in the circumferential direction) of the holding member 52.
- the pair of protrusions 71 and 72 are provided so as to face each other with the opening 36 interposed therebetween and to extend in the longitudinal direction of the conduit body 12.
- the projection 71 near the hinge portion 56 causes the shielding member 32 to be attached. It contacts so that it may press on the outer peripheral surface of the conduit body 12. In this state, the hinge part 56 side of the shielding member 32 is held between the protrusion 71 and the outer peripheral surface of the conduit body 12.
- the holding member 52 when the holding member 52 is further rotated, the projection 72 near the claw 54 comes into contact with the shielding member 32 so as to press against the outer peripheral surface of the conduit body 12.
- the protrusion 72 moves while pulling the shielding member 32 on the claw hole 22 side toward the claw hole 22 side.
- the holding member 52 is given tension to the shielding member 32 by the pair of protrusions 71 and 72. In the state, it is held by the conduit body 12.
- the noise can be more effectively reduced by holding the shielding member 32 in a state where tension is applied in this way.
- the intake duct 70 according to the fourth embodiment since tension is applied to the shielding member 32, deformation of the shielding member 32 due to pressure fluctuation inside the conduit body 12 can be suppressed, and the shielding member 32. Thus, it is possible to reduce the noise over a long period of time.
- noise since no gap is generated between the shielding member 32 and the conduit body 12, noise does not leak to the outside, and noise can be further suppressed.
- the shielding member 32 When the shielding member 32 is held without applying tension, the pressure in the air flow passage increases due to air column resonance, and the shielding member 32 swells from the vent hole 28, or the pressure decreases and the vent hole 28 decreases. There is a risk of deformation to dent. If the shielding member 32 is deformed according to pressure, particularly when the opening 36 is larger than the vent hole 28, the shielding member 32 is worn by the outer periphery of the vent hole 28, or between the shielding member 32 and the conduit body 12. There is a risk of noise leaking to the outside through the formed gap.
- the structure for holding the shielding member 32 is not limited to the protrusions 71 and 72 described above.
- the peripheral region where the open portion 36 of the holding member 52 is formed may be thin, the circumferential end portions thereof may be formed thick, and the shielding member 32 may be held by the stepped portion formed at the boundary.
- FIG. 12 is a cross-sectional view of an intake duct 70A according to a first modification of the fourth embodiment of the present invention. As shown in the sectional view of FIG. 12, grooves (holding receiving portions) 73 and 74 into which the protrusions 71 and 72 enter may be formed at positions corresponding to the protrusions 71 and 72 of the conduit body 12.
- the protrusions 71 and 72 may be provided so as to be continuous in the longitudinal direction of the conduit body 12 as shown in FIG. 10, or may be provided intermittently. Further, when the holding member 52 rotates while the projection 72 pulls the shielding member 32, the height of the projection 71 is made larger than the height of the projection 72 so that the shielding member 32 is securely held by the projection 71. Is preferred.
- the projection 71 on the side close to the rotation center of the member 52 may be configured to hold the shielding member 32 ahead of the projection 72 on the side far from the rotation center.
- FIG. 13 is a perspective view of an intake duct 70B according to a second modification of the fourth embodiment
- FIG. 14 is a cross-sectional view of a cross section along the longitudinal direction thereof.
- a pair of protrusions 81 and 82 that apply tension to the shielding member 32 are formed on the holding member 52 so as to extend in the circumferential direction across the opening 36, and the protrusions 81 and 82 are received.
- Directional grooves 83 and 84 may be formed in the conduit body 12.
- the shielding member 32 is omitted for illustration. 12-14, the protrusions 71, 72 are formed on the holding member 52 and the groove portions 73, 74 are formed on the conduit body 12. However, the protrusions 71, 72 are formed on the conduit body 12, and the groove portions 73, 74 are formed. May be formed on the holding member 52.
- FIG. 15 is a perspective view of an intake duct 90 according to the fifth embodiment of the present invention
- FIG. 16 is an enlarged cross-sectional view of a plane orthogonal to the longitudinal direction.
- a ring-shaped protrusion (holding receiving portion) 91 is formed on the outer peripheral edge of the vent hole 28 of the conduit body 12, and this corresponds to this.
- a ring-shaped protrusion (holding portion) 92 is formed on the outer peripheral edge of the opening portion 36.
- the configuration shown in FIG. 16 is preferable so that tension can be applied to the shielding member 32 with certainty.
- the radially outer side wall of the protrusion 91 presses the radially inner side wall of the protrusion 92 through the shielding member 32.
- FIG. 18 is a cross-sectional view of the conduit body 12 of the intake duct according to the sixth embodiment of the present invention.
- the holding member 52A is rotatably attached to the first half 16 of the conduit body 12 via a hinge portion 56A.
- a claw portion 54 is provided on the opposite side of the hinge portion 56A in the circumferential direction, and the claw portion 54 is locked to the claw hole 22 of the flange portion 20 so that the holding member 52A is held by the first half 16.
- the first half body 16 and the second half body 18 are attached by vibration welding, with the flange portions 16a and 18a attached to each other at a position displaced along the longitudinal direction of the conduit body 12 from the cross section shown in FIG. Bonding is performed by a technique such as bonding with an adhesive or mechanical fastening with rivets or bolts.
- the holding member 52A extends along the inner peripheral surface of the conduit body 12, and the shielding member 32 is secured to the first half 16 by the protrusions 71 and 72 provided on the outer peripheral surface of the holding member 52A.
- the shielding member 32 is fixed to the conduit body 12.
- the holding member 52 ⁇ / b> A holds a portion of the shielding member 32 that is removed from the vent hole 28 of the conduit body 12.
- the pressure fluctuation in the air flow passage 14 can be released to the outside from the vent hole 28 via the opening 36 and the shielding member 32, and the air column resonance in the air flow passage 14 can be released. Can be suppressed.
- a pair of ribs facing the inner peripheral surface of the conduit main body 12 with the vent hole 28 interposed therebetween may be formed so as to extend in the circumferential direction of the conduit main body 12.
- the flow cross section of the air flow passage 14 is formed in a circular shape, but may be a polygon such as a quadrangle, an ellipse, or other shapes.
- the circular ventilation hole 28 may be a polygon such as a quadrangle, an ellipse, or other shapes.
- the plurality of vent holes 28 constituting the opening set 26 may have the same dimensions as described above, similar shapes, different shapes, or a combination thereof.
- the total opening length in the circumferential direction of each vent hole 28 may be set so as to become smaller as approaching the inflow port. That is, compared with the total opening length of the first opening set 26A, the total opening length of the second opening set 26B located on the inlet side from the first opening set 26A is reduced, and the total opening length of the second opening set 26B is In comparison, the total opening length of the third opening set 26C located closer to the inlet side than the second opening set 26B is made smaller. With this configuration, it is possible to minimize the number and size of the vent holes 28 provided in the conduit body 12 while appropriately suppressing air column resonance.
- the mounting structure of the holding member is a structure in which the claw portion is engaged with the opened claw hole, but the claw portion may be provided on the conduit body side and the claw hole may be provided on the holding member side. It may be configured as follows.
- the pair of projections (holding portions or holding receiving portions) 71, 72, 91, 92 provided on the conduit main body 12 and the holding members 34, 52 and holding the shielding member 32 are described as ring-shaped projections.
- the present invention is not limited to this example.
- a plurality of intermittent projections formed in a polygonal frame shape such as a triangle or a quadrangle surrounding the vent hole 28 or the open portion 36, or formed along the outer periphery of the vent hole 28 or the open portion 36. Also good.
- an intake duct in which a shielding member can be easily attached to a conduit main body while ensuring air permeability by a holding member that holds a portion removed from the vent hole of the conduit main body.
Abstract
Description
(1) 一端から他端に連通する空気流通路および該空気流通路から外方に連通する通気孔を有する導管本体と、
通気性を有し、前記通気孔を覆うように配置される遮蔽部材と、
前記導管本体の外周面または内周面に沿って延在し、前記遮蔽部材を前記導管本体に固定する保持部材とを有し、
前記保持部材は、前記遮蔽部材のうち、前記導管本体の該通気孔から外れた部位を保持することを特徴とする吸気ダクト。
本発明によれば、保持部材で保持するだけで遮蔽部材を通気孔を覆った状態で導管本体に簡単に取り付けることができる。また、吸気ダクトは、遮蔽部材を保持部材で保持することで、遮蔽部材がずれ難く、保持部材で遮蔽部材を保護することができる。
本発明によれば、保持部材を容易に導管本体に取り付けることができる。
前記保持部材は、一対の前記リブの間に嵌り込むことを特徴とする(1)または(2)記載の吸気ダクト。
本発明によれば、保持部材が一対のリブにより位置決めされるので、遮蔽部材がよりずれ難くなる。
前記保持部材の少なくとも周方向の一端には係止部が設けられ、
前記導管本体には、前記係止部が係止される被係止部が設けられていることを特徴とする(1)~(3)の何れか一項に記載の吸気ダクト。
本発明によれば、簡単な構成で保持部材を導管本体に対して取り付けることができる。
前記保持部材は前記ヒンジ部を回転中心として前記導管本体に対して回転可能とされ、
前記ヒンジ部は、前記導管本体及び前記保持部材と一体的に形成されていることを特徴とする(4)に記載の吸気ダクト。
本発明によれば、簡単な構成で保持部材を導管本体に対して取り付けることができ、しかも部品点数を減らすことができる。
前記保持部材は、前記開口部を挟んで向かい合うように設けられた一対の保持部を備え、
一対の前記保持部は、前記遮蔽部材に張力が付与するように、前記遮蔽部材を前記導管本体に押し付けることを特徴とする(1)~(5)の何れか一項に記載の吸気ダクト。
本発明によれば、保持部材により遮蔽部材に張力が付与された状態で遮蔽部材が導管本体に押し付けられるので、通気孔部分での遮蔽部材の変形を抑制することができ、吸気ダクトの騒音を効果的に抑制することができる。
本発明によれば、保持部が遮蔽部材を保持受け部に押し当てることにより、より確実に遮蔽部材に張力を付与することができる。
本発明によれば、先に一方の保持部が遮蔽部材を導管本体に押圧し、他方の保持部が遮蔽部材に張力を付与するように保持部材が回転する。したがって、保持部材を回転させるだけで、遮蔽部材に張力を付与した状態で遮蔽部材を導管本体に保持することができる。
前記保持部材の回転中心に近い側の前記保持部は、前記保持部材の回転中心から遠い側の前記保持部よりも、突起高さが高いことを特徴とする(8)に記載の吸気ダクト。
保持部材の回転時に、回転中心に近い側の保持部が回転中心から遠い側の保持部より先に遮蔽部材を保持するので、より確実に遮蔽部材に張力を付与することができる。
前記保持部材の前記開口部の外周に保持部が設けられ、
前記導管本体の前記通気孔の外周に、前記保持部に対応する保持受け部が設けられ、
前記保持部と前記保持受け部は前記遮蔽部材を挟んで保持し、前記遮蔽部材に張力を付与することを特徴とする(1)~(5)の何れか一項に記載の吸気ダクト。
本発明によれば、通気孔に対応する領域の遮蔽部材に張力を付与することができるので、通気孔部分での遮蔽部材の変形を抑制することができ、吸気ダクトの騒音を効果的に抑制することができる。
本発明によれば、より確実に遮蔽部材に張力を付与することができる。
本発明の第1実施形態に係る吸気ダクト10を、添付図面を参照して以下に説明する。なお、以下の説明では、吸気ダクトにおいて、空気流通路を流通する空気の流れに沿う方向を長手方向といい、この長手方向に直交する方向を径方向といい、長手方向を軸とする軸回り方向を周方向と呼ぶ。
次に、上述した吸気ダクト10の作用について説明する。吸気ダクト10は、通気性を有する遮蔽部材32で導管本体12の通気孔28を覆うことで、通気孔28および遮蔽部材32を介して外方へ空気流通路の圧力脈動を逃がすことができ、気柱共鳴を減衰させることができる。これにより、気柱共鳴に起因する騒音の発生を抑えることができる。また、通気孔28が遮蔽部材32で覆われているので、通気孔28を直接外方に露出させる場合に比べて、通気孔28からの音漏れを抑制することができる。
通気孔の開口率による騒音の低減効果の変化について検証した。直径71mm、流入口から流出口までの中心線長が400mmの直管状の導管本体を用意し、この導管本体の流入口から流出口までの中心線長の1/2の位置に通気孔を設け、この通気孔を目付量100g/m2の不織布で覆った実験例1~5に係る吸気ダクトを作成した。また、比較例1として実験例と同様の導管本体であるが通気孔を設けないもの、比較例2として不織布で通気孔を塞がないものを用意した。
上述した第1実施形態の吸気ダクト10における保持部材34の取付構造では、周方向に離間する両方の端部を導管本体12に対して着脱可能に構成したが、一方の端部だけを着脱可能な構成としてもよい。図6および図7は本発明の第2実施形態に係る吸気ダクト50を示す断面図である。
なお、上述の第2実施形態に係る吸気ダクト50においては、ヒンジ部56は保持部材52と第1半体16とを接続するように構成されていたが、図8,9に示す第3実施形態に係る吸気ダクト60の如く、ヒンジ部56を保持部材52と第2半体18とを接続するように構成してもよい。
図10は、本発明の第4実施形態に係る吸気ダクト70の斜視図であり、図11はその長手方向に直交する面での断面図である。第4実施形態に係る吸気ダクト70は、第3実施形態に係る吸気ダクト60において、8個の通気孔28で一組の開口組26を構成し、更に遮蔽部材32を保持する一対の突起(保持部)71,72を保持部材52に形成したものである。
第4実施形態においては、遮蔽部材32の全体に張力を付与するように構成したが、遮蔽部材32のうち少なくとも通気孔28に対応する領域にのみ張力が付与されていれば、上記の騒音抑制効果を期待できる。図15は本発明の第5実施形態に係る吸気ダクト90の斜視図であり、図16はその長手方向に直交する面での拡大断面図である。
以上の第1実施形態から第5実施形態においては、導管本体12の外周面に保持部材34,52を設ける例を説明したが、図18の吸気ダクトの断面図に示すように保持部材52Aを導管本体12の内周面に設けてもよい。
Claims (11)
- 一端から他端に連通する空気流通路および該空気流通路から外方に連通する通気孔を有する導管本体と、
通気性を有し、前記通気孔を覆うように配置される遮蔽部材と、
前記導管本体の外周面または内周面に沿って延在し、前記遮蔽部材を前記導管本体に固定する保持部材とを有し、
前記保持部材は、前記遮蔽部材のうち、前記導管本体の該通気孔から外れた部位を保持することを特徴とする吸気ダクト。 - 前記保持部材は、少なくとも一端部が前記導管本体に対して着脱可能であることを特徴とする請求項1記載の吸気ダクト。
- 前記導管本体の前記外周面または前記内周面には、前記通気孔を挟んで対向する一対のリブが該導管本体の周方向に延在するように形成されており、
前記保持部材は、一対の前記リブの間に嵌り込むことを特徴とする請求項1または2記載の吸気ダクト。 - 前記保持部材は、前記導管本体の前記空気流通路の周方向に延在し、
前記保持部材の少なくとも周方向の一端には係止部が設けられ、
前記導管本体には、前記係止部が係止される被係止部が設けられていることを特徴とする請求項1~3の何れか一項に記載の吸気ダクト。 - 前記保持部材の周方向他端にはヒンジ部が設けられ、
前記保持部材は前記ヒンジ部を回転中心として前記導管本体に対して回転可能とされ、
前記ヒンジ部は、前記導管本体及び前記保持部材と一体的に形成されていることを特徴とする請求項4に記載の吸気ダクト。 - 前記保持部材には、前記導管本体の前記通気孔と対応する位置に開口部が設けられており、
前記保持部材は、前記開口部を挟んで向かい合うように設けられた一対の保持部を備え、
一対の前記保持部は、前記遮蔽部材に張力が付与するように、前記遮蔽部材を前記導管本体に押し付けることを特徴とする請求項1~5の何れか一項に記載の吸気ダクト。 - 前記導管本体には、前記保持部と対応する位置に保持受け部が形成されていることを特徴とする請求項6に記載の吸気ダクト。
- 前記保持部材の周方向一端は、前記導管本体に対して回転可能に取り付けられており、
前記保持部材の回転に伴い、一対の前記保持部のうち、前記保持部材の回転中心に近い側の前記保持部が、前記回転中心から遠い側の前記保持部より先に前記遮蔽部材を保持することを特徴とする請求項6または7に記載の吸気ダクト。 - 前記保持部は、前記保持部材から前記導管本体側に突出する突起であり、
前記保持部材の回転中心に近い側の前記保持部は、前記保持部材の回転中心から遠い側の前記保持部よりも、突起高さが高いことを特徴とする請求項8に記載の吸気ダクト。 - 前記保持部材には、前記導管本体の前記通気孔と対応する位置に開口部が設けられ、
前記保持部材の前記開口部の外周に保持部が設けられ、
前記導管本体の前記通気孔の外周に、前記保持部に対応する保持受け部が設けられ、
前記保持部と前記保持受け部は前記遮蔽部材を挟んで保持し、前記遮蔽部材に張力を付与することを特徴とする請求項1~5の何れか一項に記載の吸気ダクト。 - 前記保持部材が前記遮蔽部材を前記導管本体に固定したときに、前記保持受け部の外側部が、前記遮蔽部材を介して前記保持部の内側部に押圧されることを特徴とする請求項10に記載の吸気ダクト。
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Also Published As
Publication number | Publication date |
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US8528692B2 (en) | 2013-09-10 |
US20120292127A1 (en) | 2012-11-22 |
JP5793422B2 (ja) | 2015-10-14 |
CN102686867A (zh) | 2012-09-19 |
JPWO2011155437A1 (ja) | 2013-08-01 |
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