WO2016056484A1 - 吸気音低減装置 - Google Patents
吸気音低減装置 Download PDFInfo
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- WO2016056484A1 WO2016056484A1 PCT/JP2015/078073 JP2015078073W WO2016056484A1 WO 2016056484 A1 WO2016056484 A1 WO 2016056484A1 JP 2015078073 W JP2015078073 W JP 2015078073W WO 2016056484 A1 WO2016056484 A1 WO 2016056484A1
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- Prior art keywords
- air flow
- rectifying net
- intake
- reduction device
- circumferential
- Prior art date
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 35
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 description 16
- 238000012986 modification Methods 0.000 description 16
- 230000007423 decrease Effects 0.000 description 15
- 230000005764 inhibitory process Effects 0.000 description 7
- 229920001971 elastomer Polymers 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000806 elastomer Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
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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
- F02M35/1211—Flow throttling or guiding by using inserts in the air intake flow path, e.g. baffles, throttles or orifices; Flow guides
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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
- F02M35/10—Air intakes; Induction systems
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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
Definitions
- the present invention relates to an intake noise reduction device that is disposed in an intake pipe and reduces intake noise.
- a throttle valve In the intake pipe, a throttle valve is provided to control the intake air amount.
- a technology for rectifying the air flow by providing a rectifying net composed of a linear portion provided in a mesh shape on the downstream side of the throttle valve is known. It has been.
- a technique is also known in which this rectifying net is provided in an annular gasket that seals a gap between the end face of one of the two pipes constituting the intake pipe and the end face of the other pipe.
- the rectifying net is made of a highly rigid material such as metal, and the gasket is made of an elastic body such as rubber.
- an intake sound reduction device is also known in which the rectifying net is also made of an elastic body and integrally includes the rectifying net portion and the gasket portion (see Patent Document 1).
- the rectifying net part is made of an elastic body, there is a possibility that the rectifying net part is greatly deformed along with the air flow and is damaged. In order to suppress such breakage, it is also conceivable to increase the thickness of the linear part constituting the rectifying net part. However, simply increasing the thickness of the linear portion increases the projected area when viewed in the direction of air flow, so that the mesh becomes narrow and air flow is obstructed. When the air flow is inhibited, the flow rate is reduced, so that the required amount of air to the engine is not secured and combustion efficiency is deteriorated.
- the width of the linear portion (the width when viewed in the direction of air flow; the same applies hereinafter) is made narrow while the depth of the linear portion (air It is conceivable to increase the length in the direction of the flow. However, even if such a shape is adopted, as a result of verification, it has been found that it is difficult to sufficiently suppress the decrease in the flow rate. This point will be described with reference to FIGS.
- FIG. 9 is a diagram of the intake sound reduction device according to the virtual technology when viewed in the direction of air flow (hereinafter, such a diagram is referred to as a front view).
- FIG. 10 is a schematic cross-sectional view of the intake noise reduction device according to the virtual technology, and is a CC cross-sectional view in FIG.
- FIG. 11 is a schematic cross-sectional view showing a state in use of the intake sound reduction device according to the virtual technology, and shows a state where the throttle valve is fully opened and the air flow rate is increased. Note that FIG. 11 is a cross-sectional view taken along the CC line in FIG. 9, but only the cut surface (end surface) and the linear portion 521 near the cut surface are illustrated for explanation.
- the intake sound reduction device 500 includes an annular gasket portion 510 and a rectifying net portion 520 that is integrally provided on the inner side (in the radial direction) of the gasket portion 510.
- the intake sound reduction device 500 is composed of an elastic body such as various rubber materials or resin elastomers.
- the rectifying net portion 520 is provided so as to extend in the circumferential direction concentrically with respect to the plurality of radial linear portions 521 extending radially outward from the center of the circle of the gasket portion 510.
- a plurality of circumferential linear portions 522 are configured such that the depth is longer than the width.
- the circumferential linear portion 522 has a rectangular cross section as shown in FIG.
- the rectifying net unit 520 when the throttle valve 400 is opened and the air flows, the rectifying net unit 520 is located in the vicinity of the center of the circle of the gasket unit 510 in the downstream direction of the air flow. It deforms so as to protrude toward the side.
- the rectifying net portion 520 is deformed in this manner, the circumferential linear portion 522 is deformed so as to rotate in the direction indicated by the arrow R in FIG. That is, torsional deformation occurs.
- the surface which goes to the depth direction in the circumferential direction linear part 522 inclines, the flow of air is prevented by increasing the projection area when it sees in the direction of the flow of air. As can be seen from FIG.
- the increase in the projected area of the circumferential linear portion 522 is caused in particular by causing the radially outer surface 522A of the circumferential linear portion 522 to oppose the air flow in the arrow R direction. It is brought about by rotating. As described above, the linear portion extending in the circumferential direction obstructs the flow of air when the rectifying net portion is deformed during use, even if the depth is increased with respect to the width. The inhibitory effect was limited.
- the intake noise reduction device of the present invention is An annular gasket portion that seals a gap between an end face of one of the two pipes constituting the intake pipe and an end face of the other pipe;
- a rectifying net part that is integrally provided inside the gasket part and is configured by a linear part provided in a mesh shape, and reduces the intake noise by rectifying the air flow;
- An intake sound reduction device made of an elastic body that is disposed on the downstream side of the throttle valve in the intake pipe and reduces intake sound,
- the mesh-like linear part constituting the rectifying net part includes a circumferential linear part extending in the circumferential direction, When the circumferential linear portion defines upstream and downstream based on air flow, the upstream radial width is larger than the downstream radial width, and the radially outer surface is It is characterized by comprising a tapered surface toward the downstream side.
- the tapered surface does not contribute to an increase in the projected area in the direction of the air flow in the circumferential linear portion (hereinafter, the projected direction such as “projected area” is referred to as the direction of air flow). That is, by providing the tapered surface, an increase in the projected area of the circumferential linear portion due to deformation of the rectifying net portion is suppressed. Therefore, according to this intake sound reduction device, since the inhibition of the air flow due to the deformation of the rectifying net portion is suppressed, it is possible to suppress a decrease in the air flow rate.
- the tapered surface is configured to be substantially parallel to the direction of air flow in the deformed state of the rectifying net portion when the flow rate of air when passing through the rectifying net portion exceeds a predetermined amount. May be.
- the predetermined amount can be, for example, the air flow rate when the throttle valve is fully open.
- the mesh-like linear portion further includes a radial linear portion provided integrally with the circumferential linear portion and extending in the radial direction,
- the radial linear portion includes an upstream end surface perpendicular to the air flow in a state before the rectifying net portion is deformed,
- the angle between the upstream end face of the radial linear portion and the plane perpendicular to the air flow when the rectifying net portion is in the deformed state is ⁇ 1
- the rectifying net portion may be configured such that ⁇ 1 ⁇ ⁇ 2.
- the tapered surface of the circumferential linear portion becomes parallel to the air flow.
- the angle ⁇ 1 becomes larger than the angle ⁇ 2 due to the deformation of the rectifying net part
- the air flow directly hits the taper surface, so that there is a force to return this parallel to the taper surface.
- the tapered surface can be stably maintained substantially parallel to the air flow, so that the inhibition of the air flow can be effectively suppressed.
- the intake sound reduction device of the present invention may be configured as follows. That is, the intake noise reduction device of the present invention is An annular gasket portion that seals a gap between an end face of one of the two pipes constituting the intake pipe and an end face of the other pipe; A rectifying net part that is integrally provided inside the gasket part and is configured by a linear part provided in a mesh shape, and reduces the intake noise by rectifying the air flow; An intake sound reduction device made of an elastic body that is disposed on the downstream side of the throttle valve in the intake pipe and reduces intake sound,
- the mesh-like linear part constituting the rectifying net part includes a circumferential linear part extending in the circumferential direction, When the circumferential linear portion defines upstream and downstream based on the air flow, the upstream radial width is smaller than the downstream radial width, and the radially inner surface is It is comprised by the reverse taper surface which goes to the upstream.
- the reverse tapered surface is substantially parallel to the direction of air flow in the deformed state of the rectifying net portion when the flow rate of air when passing through the rectifying net portion exceeds a predetermined amount. It may be configured.
- the intake noise reduction device of the present invention it is possible to suppress the inhibition of the air flow due to the deformation of the rectifying net portion, and thus it is possible to suppress the decrease in the air flow rate.
- FIG. 1 is a front view of an intake sound reduction device according to Embodiment 1.
- FIG. 1 is a schematic cross-sectional view of an intake noise reduction device according to Embodiment 1.
- FIG. It is typical sectional drawing which shows the state at the time of use of the intake sound reduction apparatus which concerns on Example 1.
- FIG. It is sectional drawing explaining the deformation
- FIG. 6 is a schematic cross-sectional view of an intake noise reduction device according to Embodiment 2.
- FIG. 6 is a schematic cross-sectional view of an intake sound reduction device according to Modification 1.
- FIG. 10 is a schematic cross-sectional view of an intake sound reduction device according to Modification 2. It is a front view of the intake sound reduction device according to virtual technology. It is a typical sectional view of an inhalation sound reduction device concerning virtual technology. It is typical sectional drawing which shows the state at the time of use of the intake sound reduction device which concerns on virtual technology.
- FIG. 1 is a front view of the intake sound reduction device according to the first embodiment of the present invention when viewed in the direction of air flow.
- FIG. 2 is a schematic cross-sectional view of the intake noise reduction device according to the first embodiment of the present invention, and is a cross-sectional view taken along the line AA in FIG.
- FIG. 3 is a schematic cross-sectional view showing a state in use of the intake noise reduction device according to Embodiment 1 of the present invention, and shows a state when the throttle valve is fully opened and the air flow rate is high. .
- FIG. 4 is a cross-sectional view (enlarged cross-sectional view) illustrating the deformation state illustrated in FIG. 3 of the rectifying net unit according to the first embodiment.
- 3 and 4 are cross-sectional views taken along line AA in FIG. 1, but for the sake of explanation, a cut surface (end surface) and a radial linear portion in the vicinity of the cut surface are shown. Only 121 is illustrated.
- the intake sound reduction device 100 is configured by an elastic body such as various rubber materials or resin elastomers.
- the intake sound reduction device 100 includes an annular gasket part 110 and a rectifying net part 120.
- the rectifying net part 120 is integrally provided inside the gasket part 110 (inside in the radial direction).
- the intake sound reduction device 100 that integrally includes the gasket portion 110 and the rectifying net portion 120 can be formed by molding. Since the technique relating to mold forming is well known, its description is omitted.
- the gasket part 110 plays the role which seals the clearance gap between the end surface of one pipe
- network part 120 is comprised by the linear part provided in mesh shape, and has played the role which reduces intake sound by rectifying
- the intake sound reduction device 100 is disposed downstream of the throttle valve 400 in the intake pipe (downstream in the direction of air flow during intake). Further, in the present embodiment, the intake noise reduction device 100 is disposed in the vicinity of the connection portion between the intake manifold 200 (one pipe) and the throttle body 300 (the other pipe) constituting the intake pipe.
- the rotation shaft of the throttle valve 400 is installed so as to extend in the horizontal direction. Further, the throttle valve 400 is configured to open by rotating in the direction of arrow X in FIG.
- the direction indicated by the arrow Y is the direction of air flow in the present invention. Therefore, the front view of the intake sound reduction device 100 shown in FIG. 1 is a view when viewed in the direction of the arrow Y. In the following, upstream and downstream are defined based on the air flow.
- the intake pipe has a cylindrical shape. Therefore, the gasket part 110 has an annular shape.
- the gasket portion 110 is formed by an annular notch 210 formed along the inner periphery of the end face of the intake manifold 200 and an annular notch 310 formed along the inner periphery of the end face of the throttle body 300. It arrange
- the rectifying net part 120 is provided inside the gasket part 110 having a circular planar shape.
- the rectifying net portion 120 extends in the circumferential direction concentrically with the plurality of radial linear portions 121 extending radially outward from the center of the circle of the gasket portion 110 in the radial direction. It comprises a plurality of circumferential linear portions 122.
- five radial linear portions 121 are provided, and two circumferential linear portions 122 are provided.
- the plurality of radial linear portions 121 and the plurality of circumferential linear portions 122 form a mesh.
- the angles between the adjacent radial linear portions 121 are set to be approximately equal.
- the radial intervals between adjacent circumferential linear portions 122 are set to be approximately equal.
- the mesh of the rectifying net portion 120 is fine near the center of the circle of the gasket portion 110 and becomes rougher as it goes away from the center.
- the distance between the throttle valve 400 and the rectifying net portion 120 is shorter than half the length of the valve body portion of the throttle valve 400. Therefore, the rectifying net portion 120 is provided so as to occupy a substantially half region inside the gasket portion 110 having a circular planar shape so that the throttle valve 400 does not contact the rectifying net portion 120.
- the remaining substantially semicircular region is a cavity.
- the semicircular region in which the rectifying net portion 120 is provided is disposed in the upper portion, and the hollow semicircular region is disposed in the lower portion. . Thereby, even if the throttle valve 400 is fully opened, the throttle valve 400 does not contact the rectifying net portion 120 (see FIG. 3).
- network part 120 are demonstrated in detail based on FIG.1 and FIG.2 especially.
- the state when the intake sound reduction device 100 is not deformed is shown.
- the right side in the figure is the upstream side.
- the circumferential linear portion 122 constituting the rectifying net portion 120 according to the present embodiment is configured such that the upstream radial width t1 is larger than the downstream radial width t2.
- the radial width is the width when the circumferential linear portion 122 is viewed in the direction of air flow (the width when viewed from the front as shown in FIG. 1), and the circumferential linear portion.
- the thickness may be 122.
- the circumferential linear part 122 is comprised by the taper surface (surface tapering toward the downstream side) where the surface 122A which is a surface of the radial direction outer side goes to the downstream side.
- the surface 122A is a linear taper surface with a taper angle of ⁇ 2 (see FIG. 4).
- a surface 122B, which is a radially inner surface of the circumferential linear portion 122, is configured by a cylindrical inner peripheral surface parallel to the air flow in a state before the rectifying net portion 120 is deformed.
- Each of the upstream end surface 122C and the downstream end surface 122D of the circumferential linear portion 122 is configured by an annular surface perpendicular to the air flow before the rectifying net portion 120 is deformed. Accordingly, the circumferential linear portion 122 has a quadrangular shape in the cross section shown in FIG. 2 (a cross section taken along a plane perpendicular to the direction in which the circumferential linear portion 122 extends). In the circumferential linear portion 122, the length (depth) L in the air flow direction is set longer than the radial widths t1 and t2.
- the radial linear portion 121 provided integrally with the circumferential linear portion 122 constituting the rectifying net portion 120 is an upstream end surface 121C perpendicular to the air flow before the rectifying net portion 120 is deformed. It has.
- the radial linear portion 121 is formed so that the width (thickness) when viewed in the direction in which air flows is substantially constant. Further, the radial linear portion 121 is set to have a length (depth) L in the air flow direction longer than the thickness.
- the radial linear portions 121 and the circumferential linear portions 122 are thinner. Further, from the viewpoint of suppressing the deformation of the rectifying net portion 120, the depths of the radial direction linear portion 121 and the circumferential direction linear portion 122 are preferably as large as possible.
- the state when the rectifying net part 120 is deformed by the air flow will be described in detail.
- the throttle valve 400 is opened and closed to change the flow rate of air flowing through the intake pipe, the rectifying net unit 120 is deformed according to the flow of air (direction, flow rate, etc.).
- the radial linear portion 121 extends while being bent toward the downstream side.
- the circumferential linear portion 122 is a direction in which the circumferential linear portion 122 extends when the throttle valve 400 is opened and the air flow rate gradually increases, as indicated by an arrow R in FIG. Is deformed to rotate around the center axis.
- the surface 122A on the outer side in the radial direction of the circumferential linear portion 122 is configured as a tapered surface toward the downstream side, even if the circumferential linear portion 122 rotates, the surface 122A does not flow air. Until parallel to the direction, the surface 122A does not appear when viewed in the direction of air flow. That is, the surface 122A does not contribute to the increase in the projected area of the circumferential linear portion 122 until it becomes parallel to the air flow direction. Therefore, even if the rectification net part 120 is deformed, the inhibition of the air flow is suppressed.
- the surface 122A has air in the deformed state of the rectifying net 120 when the flow rate of air when passing through the rectifying net 120 exceeds a predetermined amount (a preset amount). It is comprised so that it may become substantially parallel with the direction of the flow of (refer FIG. 3). Accordingly, the surface 122A does not contribute to an increase in the projected area of the circumferential linear portion 122 until the air flow rate when passing through the rectifying net portion 120 exceeds a predetermined amount. In this embodiment, the air flow rate when the throttle valve 400 is fully opened is set as the predetermined amount.
- the rectifying net unit 120 is in the above-described deformed state (the deformed state when the flow rate of air when passing through the rectifying net unit 120 exceeds a predetermined amount).
- the angle between the end surface 121C of the radial linear portion 121 and the plane P perpendicular to the air flow is ⁇ 1
- the taper angle of the surface 122A of the circumferential linear portion 122 is ⁇ 2
- the net unit 120 is configured so that ⁇ 1 ⁇ ⁇ 2 is satisfied. Therefore, when the angle ⁇ 1 becomes equal to the angle ⁇ 2 due to the deformation of the rectifying net portion 120, the surface 122A of the circumferential linear portion 122 becomes parallel to the air flow.
- the angle ⁇ 1 described above is a circumferential linear shape when the rectifying net unit 120 is in the above-described deformation state (deformation state when the flow rate of air when passing through the rectification net unit 120 exceeds a predetermined amount).
- An angle between the end surface 122C of the portion 122 and a plane perpendicular to the air flow may be used.
- the circumferential linear portion 122 constituting the rectifying net portion 120 has an upstream radial width t1 larger than a downstream radial width t2.
- the outer surface 122A in the radial direction is configured as a tapered surface toward the downstream side.
- the surface 122A is configured to be substantially parallel to the air flow direction in the deformed state of the rectifying net 120 when the flow rate of air when passing through the rectifying net 120 exceeds a predetermined amount. ing. Thereby, it becomes possible to suppress obstruction of the air flow until the flow rate of the air when passing through the rectifying net unit 120 exceeds a predetermined amount.
- the end face 121C and the plane P perpendicular to the air flow are formed in the deformed state of the rectifying net 120 when the flow rate of air when passing through the rectifying net 120 exceeds a predetermined amount.
- the rectifying net unit 120 is configured to satisfy ⁇ 1 ⁇ ⁇ 2. According to this configuration, when the rectifying net 120 is deformed so that the angle ⁇ 1 is larger than the angle ⁇ 2, a force is applied to return the surface 122A in parallel to the surface 122A by the air flow. Therefore, according to the present embodiment, the surface 122A can be stably maintained substantially parallel to the air flow, so that inhibition of the air flow can be effectively suppressed.
- Example 2 shows a second embodiment of the present invention.
- the circumferential linear portion is configured by a taper surface in which the upstream radial width is larger than the downstream radial width and the radially outer surface faces the downstream side. Examples are shown.
- the upstream radial width is smaller than the downstream radial width, and the radially inner surface is configured as a reverse tapered surface toward the upstream side. . Since other configurations are the same as those of the first embodiment, the same reference numerals are given to the same components, and the description thereof is omitted.
- FIG. 5 is a schematic cross-sectional view of the intake noise reduction device according to the second embodiment of the present invention, similar to FIG.
- FIG. 6 is a schematic cross-sectional view showing a state in use of the intake noise reduction device according to the second embodiment of the present invention, similar to FIG.
- the intake sound reducing device 600 according to the present embodiment only the configuration of the circumferential linear portion 622 among the linear portions constituting the rectifying net portion 620 is the same as the configuration of the intake sound reducing device 100 shown in the first embodiment. Is different. Since other configurations are the same, description thereof is omitted.
- the circumferential linear portion 622 constituting the rectifying net portion 620 according to the present embodiment is configured such that the upstream radial width t3 is smaller than the downstream radial width t4.
- the circumferential linear part 622 is comprised by the reverse taper surface (surface of a mortar shape which expands toward an upstream side) where the surface 622B which is a surface inside radial direction goes upstream.
- the surface 622A which is the radially outer surface of the circumferential linear portion 622, is formed of a cylindrical surface parallel to the air flow before the rectifying net portion 620 is deformed.
- the upstream end surface 622C and the downstream end surface 622D of the circumferential linear portion 622 are each formed of an annular surface perpendicular to the air flow before the rectifying net portion 620 is deformed.
- the circumferential linear portion 622 has a quadrangular shape in the cross section shown in FIG. 5 (a cross section taken along a plane perpendicular to the direction in which the circumferential linear portion 622 extends).
- the length (depth) L in the air flow direction is set larger than the radial width (thickness) t3 and t4.
- the thickness of the circumferential linear portion 622 is preferably as small as possible and the depth is as large as possible from the viewpoint of suppressing a decrease in the air flow rate.
- the radially inner surface 622B of the circumferential linear portion 622 is composed of an inversely tapered surface toward the upstream side, its projected area as the circumferential linear portion 622 rotates in the direction of arrow R. Becomes smaller. Thereby, even if the projection area of the other surface of circumferential direction linear part 622 increases by rotation, the increase in the projection area of circumferential direction linear part 622 is controlled.
- the surface 622B is substantially parallel to the air flow direction in the deformed state of the rectifying net unit 620 when the flow rate of air when passing through the rectifying net unit 620 exceeds a predetermined amount. (See FIG. 6). As a result, when the air flow rate when passing through the rectifying net portion 620 exceeds a predetermined amount, the projected area of the surface 622B becomes substantially zero, so that a reduction in the air flow rate can be effectively suppressed. become.
- the predetermined amount may be set in the same manner as in the first embodiment.
- the circumferential linear portion 622 constituting the rectifying net portion 620 has an upstream radial width t3 smaller than a downstream radial width t4.
- the radially outer surface 622 ⁇ / b> B is configured as a reverse tapered surface toward the upstream side.
- the surface 622B is configured to be substantially parallel to the air flow direction in the deformed state of the rectifying net unit 620 when the flow rate of air when passing through the rectifying net unit 620 exceeds a predetermined amount. ing. Thereby, when the flow rate of the air when passing through the rectifying net unit 620 exceeds a predetermined amount, it is possible to effectively suppress the decrease in the flow rate of the air flow.
- Modification 7 and 8 show a modified example of the present invention.
- the configuration in which the rectifying net portion is provided in a substantially semicircular region inside the gasket portion is shown.
- region inside a gasket part is shown. Since other configurations and operations are the same as those in the above embodiment, the same components are denoted by the same reference numerals, and the description thereof is omitted.
- FIG. 7 is a schematic cross-sectional view of the intake sound reduction device according to the first modification of the present invention, and is the same cross-sectional view as FIG. 2 described above.
- the intake noise reduction device 700 according to the present modification includes an annular gasket portion 110 and a rectifying net portion 720.
- the rectifying net portion 720 includes a plurality of radial linear portions 121 extending radially outward from the center of the circle of the gasket portion 110 and the center of the circle. On the other hand, it is comprised from the several circumferential direction linear part 722 extended in the circumferential direction concentrically.
- the circumferential linear portion 722 is similar to the circumferential linear portion 122 in the first embodiment, and the upstream radial width is larger than the downstream radial width, and the radially outer portion 722 has a radially outer side.
- the surface 722 ⁇ / b> A is a tapered surface toward the downstream side.
- the dimensions of each surface constituting the circumferential linear portion 722, the taper angle of the surface 722A, the deformation mode of the rectifying net portion 720 according to the air flow, and the like are the same as in the first embodiment. In other words, the present modification is different from the first embodiment only in that the rectifying net portion 720 is provided over the entire area inside the gasket portion 110.
- the throttle valve 400 and the rectifier net are arranged so that the opened throttle valve 400 does not contact the rectifier net unit 720 with respect to the positional relationship between the intake noise reduction device 700 and the throttle valve 400 in the intake pipe.
- the distance from the portion 720 is set to be longer than half of the length of the valve body portion of the throttle valve 400.
- the same effect as in the case of the first embodiment can be obtained.
- the surface 722A does not contribute to the increase in the projected area of the circumferential linear portion 722, and thus suppresses a decrease in the air flow rate. Is possible.
- the air flowing in the intake air can be rectified over a wide range.
- FIG. 8 is a schematic cross-sectional view of the intake sound reduction device according to the second modification of the present invention, which is the same cross-sectional view as FIG. 2 described above.
- the intake noise reduction device 800 according to the present modification includes an annular gasket portion 110 and a rectifying net portion 820.
- the rectifying net portion 820 has a plurality of radial linear portions 121 extending radially outward from the center of the circle of the gasket portion 110 and the center of the circle.
- it comprises a plurality of circumferential linear portions 822 that extend concentrically in the circumferential direction.
- the circumferential linear portion 822 is similar to the circumferential linear portion 622 in the second embodiment, the upstream radial width is smaller than the downstream radial width, and the radially inner portion
- the surface 822B is composed of a reverse taper surface toward the upstream side.
- the dimensions of each surface constituting the circumferential linear portion 822, the taper angle of the surface 822B, the deformation mode of the rectifying net portion 820 according to the air flow, and the like are the same as in the second embodiment. That is, the present modification is different from the second embodiment only in that the rectifying net portion 820 is provided over the entire area inside the gasket portion 110.
- the positional relationship between the intake noise reduction device 800 and the throttle valve 400 in the intake pipe is the same as that of the first modification.
- the same effect as in the second embodiment can be obtained. That is, when the circumferential linear portion 822 rotates due to the deformation of the rectifying net portion 820, the projected area of the surface 822B is reduced, so that it is possible to suppress a decrease in the air flow rate. Moreover, according to this modification, the air flowing in the intake air can be rectified over a wide range.
- the angle between adjacent radial linear portions and the radial interval between adjacent circumferential linear portions are set substantially equal.
- the taper angle of the taper surface and reverse taper surface which were provided in the several circumferential direction linear part is made into the same angle.
- these numerical values may be appropriately changed as long as the operational effects of the present invention are exhibited.
- the taper angle of the tapered surface provided in each circumferential linear portion may be appropriately changed in consideration of the deformation state during use. Good. That is, the taper angle or the like may be appropriately set so that each rotated taper surface is parallel to the direction of air flow in the intended use state.
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Air-Flow Control Members (AREA)
- Details Of Valves (AREA)
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Abstract
Description
すなわち、本発明の吸気音低減装置は、
吸気管を構成する2つの管のうち一方の管の端面と他方の管の端面との間の隙間を封止する環状のガスケット部と、
該ガスケット部の内側に一体に設けられ、かつ網目状に設けられた線状部により構成され、空気の流れを整流することで吸気音を低減させる整流ネット部と、
を備え、吸気管内においてスロットルバルブの下流側に配置されて吸気音を低減させる弾性体製の吸気音低減装置であって、
前記整流ネット部を構成する網目状の線状部は、周方向に伸びる周方向線状部を含み、
前記周方向線状部は、空気の流れに基づいて上流と下流を定義した場合に、上流側の径方向の幅が下流側の径方向の幅よりも大きく、かつ、径方向外側の面が下流側へ向かうテーパ面で構成されていることを特徴とする。
前記径方向線状部は、前記整流ネット部が変形する前の状態において空気の流れに垂直な上流側の端面を備え、
前記整流ネット部が前記変形状態にあるときにおける前記径方向線状部の前記上流側の端面と空気の流れに垂直な平面との間の角度をθ1とし、前記周方向線状部のテーパ面のテーパ角をθ2としたときに、前記整流ネット部は、θ1≧θ2が成立するように構成されてもよい。
即ち、本発明の吸気音低減装置は、
吸気管を構成する2つの管のうち一方の管の端面と他方の管の端面との間の隙間を封止する環状のガスケット部と、
該ガスケット部の内側に一体に設けられ、かつ網目状に設けられた線状部により構成され、空気の流れを整流することで吸気音を低減させる整流ネット部と、
を備え、吸気管内においてスロットルバルブの下流側に配置されて吸気音を低減させる弾性体製の吸気音低減装置であって、
前記整流ネット部を構成する網目状の線状部は、周方向に伸びる周方向線状部を含み、
前記周方向線状部は、空気の流れに基づいて上流と下流を定義した場合に、上流側の径方向の幅が下流側の径方向の幅よりも小さく、かつ、径方向内側の面が上流側へ向かう逆テーパ面で構成されていることを特徴とする。
図1~図4を参照して、本発明の実施例1に係る吸気音低減装置について説明する。図1は本発明の実施例1に係る吸気音低減装置を空気の流れの方向に見たときの正面図である。図2は本発明の実施例1に係る吸気音低減装置の模式的断面図であり、図1中のAA断面図である。図3は本発明の実施例1に係る吸気音低減装置の使用時の状態を示す模式的断面図であり、スロットルバルブが全開して空気の流量が高くなっているときの状態を示している。図4は、実施例1に係る整流ネット部の図3に示される変形状態を説明する断面図(拡大断面図)である。なお、図3及び図4中の吸気音低減装置の断面図は、図1中のAA断面図であるが、説明のために、切断面(端面)と、切断面近傍の径方向線状部121のみを図示している。
整流ネット部120を構成する径方向線状部121及び周方向線状部122について、特に図1及び図2に基づいてより詳細に説明する。なお、両図においては、吸気音低減装置100の変形していないときの状態が示されている。また、図2においては、図中右側が上流側である。本実施例に係る整流ネット部120を構成する周方向線状部122は、上流側の径方向の幅t1が下流側の径方向の幅t2よりも大きく構成されている。なお、径方向の幅は、周方向線状部122を空気が流れる方向に見たときの幅(図1に示されるように正面から見たときの幅)であって、周方向線状部122の厚さと言ってもよい。そして、周方向線状部122は、径方向外側の面である面122Aが下流側へ向かうテーパ面(下流側に向かって先細りとなる面)で構成されている。なお、面122Aは、テーパ角度がθ2の線形テーパ面である(図4参照)。周方向線状部122の径方向内側の面である面122Bは、整流ネット部120が変形する前の状態において空気の流れに平行な円筒の内周面から構成されている。周方向線状部122の上流側の端面122C及び下流側の端面122Dのそれぞれは、整流ネット部120が変形する前の状態において空気の流れに垂直な円環状の面から構成されている。したがって、周方向線状部122は、図2に示される断面(周方向線状部122が伸びる方向に垂直な面による断面)において四角形となる。そして、周方向線状部122は、径方向の幅t1やt2よりも空気の流れの方向の長さ(奥行き)Lが長く設定されている。
次に、空気の流れによって整流ネット部120が変形しているときの状態について詳細に説明する。スロットルバルブ400が開閉されて吸気管を流れる空気の流量が変化すると、整流ネット部120は空気の流れ(方向や流量等)に応じて変形する。ここで、径方向線状部121は、スロットルバルブ400が開かれて空気の流量が徐々に増大すると、下流側へ向かって撓みながら伸長する。これに対して、周方向線状部122は、スロットルバルブ400が開かれて空気の流量が徐々に増大すると、図3中の矢印Rに示されるように、周方向線状部122が伸びる方向を中心軸線として回転するように変形する。つまり、ねじり変形が生じる。ここで、周方向線状部122の径方向外側の面122Aは、下流側に向かうテーパ面で構成されているため、周方向線状部122が回転しても、面122Aが空気の流れの方向と平行となるまでは、空気の流れの方向で見たときに面122Aが現れない。つまり、面122Aは、空気の流れの方向と平行になるまでは周方向線状部122の投影面積の増大に寄与しない。したがって、整流ネット部120が変形しても、空気の流れの阻害は抑制される。
本実施例に係る吸気音低減装置100によれば、整流ネット部120を構成する周方向線状部122は、上流側の径方向の幅t1が下流側の径方向の幅t2よりも大きく、かつ、径方向外側の面122Aが下流側へ向かうテーパ面で構成されている。これにより、整流ネット部120が変形することによって周方向線状部122が回転しても、面122Aが空気の流れの方向と平行となるまでは、周方向線状部122の投影面積の増大が抑制される。ゆえに、吸気音低減装置100によれば、空気の流れの阻害を抑制することができるため、空気の流量低下を抑制することが可能になる。また、面122Aは、整流ネット部120を通過する際の空気の流量が所定量を超えているときにおける整流ネット部120の変形状態において、空気の流れの方向と略平行となるように構成されている。これにより、整流ネット部120を通過する際の空気の流量が所定量を超えるまで、空気の流れの阻害を抑制することが可能になる。
図5及び図6には、本発明の実施例2が示されている。上記実施例1では、周方向線状部について、上流側の径方向の幅が下流側の径方向の幅よりも大きく、かつ、径方向外側の面が下流側へ向かうテーパ面で構成されている実施例を示した。これに対して、実施例2においては、上流側の径方向の幅が下流側の径方向の幅よりも小さく、かつ、径方向内側の面が上流側へ向かう逆テーパ面で構成されている。その他の構成については実施例1と同一なので、同一の構成部分については同一の符号を付して、その説明は省略する。
次に、空気の流れによって整流ネット部620が変形しているときの状態について詳細に説明する。スロットルバルブ400が開閉されて吸気管を流れる空気の流量が変化すると、整流ネット部620は空気の流れ(方向や流量等)に応じて変形する。ここで、径方向線状部121は、上記の実施例1の場合と同様に変形する。これに対して、周方向線状部622は、閉じていたスロットルバルブ400が開かれて空気の流量が徐々に増大すると、図6中の矢印Rに示されるように、線状部が伸びる方向を中心軸線として回転するように変形する。つまり、ねじり変形が生じる。ここで、周方向線状部622の径方向内側の面622Bは、上流側に向かう逆テーパ面で構成されているため、周方向線状部622が矢印Rの向きに回転するにつれてその投影面積が小さくなる。これにより、回転によって周方向線状部622の他の面の投影面積が増大しても、周方向線状部622の投影面積の増大は抑制される。
本実施例に係る吸気音低減装置600によれば、整流ネット部620を構成する周方向線状部622は、上流側の径方向の幅t3が下流側の径方向の幅t4よりも小さく、かつ、径方向外側の面622Bが上流側へ向かう逆テーパ面で構成されている。これにより、整流ネット部620が変形することによって周方向線状部622が回転したときは、面622Bが空気の流れの方向と平行になるまで、面622Bの投影面積が減少する。ゆえに、吸気音低減装置600によれば、空気の流れの阻害を抑制することができるため、空気の流量低下を抑制することが可能になる。また、面622Bは、整流ネット部620を通過する際の空気の流量が所定量を超えているときにおける整流ネット部620の変形状態において、空気の流れの方向と略平行となるように構成されている。これにより、整流ネット部620を通過する際の空気の流量が所定量を超えているときに、空気の流れの流量低下を効果的に抑制することが可能になる。
図7及び図8には、本発明の変形例が示されている。上記の実施例においては、整流ネット部がガスケット部の内側の略半円形の領域に設けられる場合の構成を示した。これに対して、変形例においては、整流ネット部がガスケット部の内側の全領域に亘って設けられる場合の構成を示す。その他の構成および作用については上記の実施例と同一なので、同一の構成部分については同一の符号を付して、その説明は省略する。
上記した実施例や変形例においては、隣り合う径方向線状部の間の角度や、隣り合う周方向線状部の径方向の間隔はほぼ等しく設定されている。また、複数の周方向線状部に設けられたテーパ面や逆テーパ面のテーパ角度は同一の角度とされている。しかしながら、これらの数値は、本発明の作用効果が発揮される限りにおいて、適宜変更してよい。例えば、本発明においては、整流ネット部は弾性的に変形し得るため、各周方向線状部に設けられたテーパ面のテーパ角度を、使用時の変形状態を考慮して適宜変更してもよい。つまり、意図される使用時の状態において、回転した各テーパ面が空気の流れの方向と平行となるように、テーパ角等を適宜設定してよい。
110 ガスケット部
120、620、720、820 整流ネット部
121 径方向線状部
122、622、722、822 周方向線状部
200 インテークマニホールド
300 スロットルボディ
400 スロットルバルブ
Claims (5)
- 吸気管を構成する2つの管のうち一方の管の端面と他方の管の端面との間の隙間を封止する環状のガスケット部と、
該ガスケット部の内側に一体に設けられ、かつ網目状に設けられた線状部により構成され、空気の流れを整流することで吸気音を低減させる整流ネット部と、
を備え、吸気管内においてスロットルバルブの下流側に配置されて吸気音を低減させる弾性体製の吸気音低減装置であって、
前記整流ネット部を構成する網目状の線状部は、周方向に伸びる周方向線状部を含み、
前記周方向線状部は、空気の流れに基づいて上流と下流を定義した場合に、上流側の径方向の幅が下流側の径方向の幅よりも大きく、かつ、径方向外側の面が下流側へ向かうテーパ面で構成されていることを特徴とする吸気音低減装置。 - 前記テーパ面は、前記整流ネット部を通過する際の空気の流量が所定量を超えているときにおける前記整流ネット部の変形状態において、空気の流れの方向と略平行となるように構成されていることを特徴とする、請求項1に記載の吸気音低減装置。
- 前記網目状の線状部は、前記周方向線状部と一体に設けられた、径方向に伸びる径方向線状部を更に含み、
前記径方向線状部は、前記整流ネット部が変形する前の状態において空気の流れに垂直な上流側の端面を備え、
前記整流ネット部が前記変形状態にあるときにおける前記径方向線状部の前記上流側の端面と空気の流れに垂直な平面との間の角度をθ1とし、前記周方向線状部のテーパ面のテーパ角をθ2としたときに、前記整流ネット部は、θ1≧θ2が成立するように構成されていることを特徴とする、請求項2に記載の吸気音低減装置。 - 吸気管を構成する2つの管のうち一方の管の端面と他方の管の端面との間の隙間を封止する環状のガスケット部と、
該ガスケット部の内側に一体に設けられ、かつ網目状に設けられた線状部により構成され、空気の流れを整流することで吸気音を低減させる整流ネット部と、
を備え、吸気管内においてスロットルバルブの下流側に配置されて吸気音を低減させる弾性体製の吸気音低減装置であって、
前記整流ネット部を構成する網目状の線状部は、周方向に伸びる周方向線状部を含み、
前記周方向線状部は、空気の流れに基づいて上流と下流を定義した場合に、上流側の径方向の幅が下流側の径方向の幅よりも小さく、かつ、径方向内側の面が上流側へ向かう逆テーパ面で構成されていることを特徴とする吸気音低減装置。 - 前記逆テーパ面は、前記整流ネット部を通過する際の空気の流量が所定量を超えているときにおける前記整流ネット部の変形状態において、空気の流れの方向と略平行となるように構成されていることを特徴とする、請求項4に記載の吸気音低減装置。
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