JP6384141B2 - Intake sound reduction device - Google Patents

Description

  The present invention relates to an intake noise reduction device that is disposed in an intake pipe and reduces intake noise.

  A throttle valve is provided in the intake pipe to control the intake air amount. Here, there is a problem that abnormal noise is generated when the throttle valve is suddenly opened. A mechanism for generating this abnormal noise will be described with reference to FIG. FIG. 8 is a view for explaining the air flow at the beginning of opening of the throttle valve in the intake pipe. As shown, a throttle valve 300 is provided in the intake pipe 200. In general, the throttle valve 300 is configured to rotate around a rotating shaft installed so as to extend in the horizontal direction. Therefore, when the throttle valve 300 starts to open, an upper air flow X1 and a lower air flow X2 in the intake pipe 200 are generated. It is considered that abnormal noise is generated when the upper air flow X1 and the lower air flow X2 merge.

  Therefore, conventionally, a technique for rectifying the flow of air by providing a rectification net composed of a linear portion provided in a mesh shape in order to suppress the occurrence of the above-described abnormal noise is known. ing. There is also known a technique 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 (patent) Reference 1).

  In such a technique, 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. In this case, since the cost increases, it is conceivable that the rectifying net is also made of an elastic body, and the rectifying net and the gasket are integrally formed. As a result, it is possible to form an intake noise reduction device that is integrally provided with a rectifying net portion and a gasket portion by means of a mold, and thus it is possible to reduce costs. However, when the rectifying net part is formed of an elastic body, there is a concern that the rectifying function is deteriorated due to the rectifying net part being deformed along with the air flow. In order to suppress deformation of the rectifying net part, it is conceivable to make the linear part thick. However, if the linear part is simply made thick, the mesh becomes narrow and the flow of gas is obstructed. In this case, the combustion efficiency is reduced due to the reduction of the intake air amount.

JP 2007-247547 A

  An object of the present invention is to provide an intake sound reduction device capable of suppressing a decrease in intake air amount while suppressing a decrease in rectification function by suppressing deformation of the rectification net portion even if the rectification net portion is constituted by an elastic body. It is to provide.

  The present invention employs the following means in order to solve the above problems.

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 linear portion is characterized in that when the width is W and the depth is T, T ÷ W is set to be not less than 2 times and not more than 5 times.

  According to the present invention, the linear portion provided in a mesh shape constituting the rectifying net portion has a depth T set to be 2 times or more and 5 times or less compared to the width W. Accordingly, since the depth T is wide even if the width W is narrow, it is possible to prevent the linear portion from being deformed by the air flow without narrowing the mesh.

  For example, the width W of the linear portion is set to 0.7 mm or more and 2 mm or less, and the depth T is set to 2 mm or more and 6 mm or less, and T ÷ W is set to 2 times or more and 5 times or less. Thereby, it can suppress that a linear part deform | transforms by the flow of air suitably, without narrowing a mesh.

  The rectifying net part may be configured such that the mesh in the vicinity of the center of the flow path in the intake pipe is fine and the mesh is coarser as the distance from the center increases.

  At the beginning of opening of the throttle valve, air flows from two locations farthest from the rotation shaft of the throttle valve become mainstream. That is, as described in the background art, when the rotary shaft is provided so as to extend in the horizontal direction, the air flow on the upper side and the air flow on the lower side become mainstream. And in this invention, the mesh | network of the rectification | straightening net | network part arrange | positioned in the downstream of a throttle valve is comprised so that the center vicinity of the flow path in an intake pipe may become fine, and it becomes rough as it goes away from the center vicinity. For this reason, since air tends to flow in a coarse area of the mesh, the air is rectified so as to flow more in a region farther from the vicinity of the center in the intake pipe. Therefore, it is possible to suppress the merging of the air flow from the two places.

  The rectifying net portion includes a plurality of radial linear portions extending radially outward from the vicinity of the center of the flow path in the intake pipe, and a plurality of concentric linear portions provided concentrically from the vicinity of the center. A mesh is preferably formed. The “concentric linear portion” in the present invention includes not only a complete circular shape but also a circular shape such as a semicircle.

  As a result, it is possible to realize a rectifying net portion in which the mesh in the vicinity of the center of the flow path in the intake pipe is fine and the mesh becomes coarser as the distance from the center increases. Further, the rectifying net portion is elastically deformed to some extent although the deformation amount is suppressed. However, the shape obtained by projecting the rectifying net portion configured as described above in the air flowing direction has little change before and after the deformation. Therefore, the rectification function is stably exhibited. Further, when the rectifying net portion is elastically deformed by the air flow, a uniform force acts on the radial linear portion, and a uniform force acts on the entire rectifying net portion. Therefore, it is excellent in durability.

  In addition, said each structure can be employ | adopted combining as much as possible.

  As described above, according to the present invention, even if the rectifying net portion is formed of an elastic body, the deterioration of the rectifying function is suppressed by suppressing the deformation of the rectifying net portion, and the reduction of the intake amount is suppressed. be able to.

FIG. 1 is a plan view of an intake noise reduction device according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view showing a state in use of the intake sound reduction device according to Embodiment 1 of the present invention. FIG. 3 is a schematic cross-sectional view of the linear portion according to the first embodiment of the present invention. FIG. 4 is a schematic cross-sectional view of the linear portion according to the first embodiment of the present invention. FIG. 5 is a schematic cross-sectional view of an apparatus for measuring the transition of sound pressure. FIG. 6 is a graph showing the measurement result of the transition of the sound pressure when the intake sound reduction device is not used. FIG. 7 is a plan view of the intake noise reduction device according to the second embodiment of the present invention. FIG. 8 is a view for explaining the air flow at the beginning of opening of the throttle valve in the intake pipe.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be exemplarily described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to those unless otherwise specified. .

Example 1
With reference to FIG. 1 to FIG. 4, an intake noise reduction device according to Embodiment 1 of the present invention will be described.

<Intake noise reduction device>
With reference to FIG.1 and FIG.2, the structure of the intake sound reduction apparatus which concerns on a present Example is demonstrated. FIG. 1 is a plan view of an intake noise reduction device according to Embodiment 1 of the present invention. FIG. 2 is a schematic cross-sectional view showing a state in use of the intake sound reduction device according to Embodiment 1 of the present invention. 2 is a cross-sectional view taken along the line AA in FIG.

  The intake sound reduction device 100 according to this embodiment includes a rectifying net portion 110 and an annular gasket portion 120. The rectifying net portion 110 is integrally provided inside the gasket portion 120 (inside in the radial direction). The intake sound reduction device 100 is configured by an elastic body such as various rubber materials or resin elastomers. In addition, the intake sound reduction device 100 that integrally includes the rectifying net portion 110 and the gasket portion 120 can be formed by molding. Since the technique relating to mold forming is well known, its description is omitted.

  And the rectification | straightening net | network part 110 is comprised by the linear part provided in mesh shape, and bears the role which reduces intake sound by rectifying | straightening the flow of air. The gasket portion 120 plays a role of sealing 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 intake noise reduction device 100 according to the present embodiment is disposed on the downstream side of the throttle valve 300 in the intake pipe (on the downstream side 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 a connection portion between the intake manifold 210 (one pipe) and the throttle body 220 (the other pipe) constituting the intake pipe. In this embodiment, the rotary shaft of the throttle valve 300 is installed so as to extend in the horizontal direction. The throttle valve 300 is configured to open the valve by rotating in the direction of the arrow in FIG. With the above configuration, when the throttle valve 300 starts to open, an upper air flow and a lower air flow in the intake pipe are generated. This point is as described with reference to FIG. 8 in the background art.

In the present embodiment, the intake pipe has a cylindrical shape. Therefore, the gasket portion 120 has an annular shape. The gasket portion 120 is disposed in an annular notch 211 formed along the inner periphery of the end face of the intake manifold 210. Thereby, the gasket part 120 exhibits the function which seals the clearance gap between these end surfaces by being pinched | interposed between the end surface of the intake manifold 210, and the end surface of the throttle body 220. FIG.

  The rectifying net part 110 is provided inside the gasket part 120 having a circular planar shape. The rectifying net portion 110 includes a plurality of radial linear portions 111a, 111b, 111c, 111d, 111e, 111f, and 111g that extend radially outward from the center of the circle of the gasket portion 120, and the center of the circle. A plurality of concentric linear portions 112a, 112b, 112c, and 112d provided concentrically. Hereinafter, for the convenience of explanation, the radial linear portions 111a, 111b, 111c, 111d, 111e, 111f, and 111g are appropriately omitted by omitting the Roman suffixes, “radial linear portions 111” or “linear portions”. 111 ". Similarly, the concentric linear portions 112a, 112b, 112c, and 112d are appropriately referred to as “concentric linear portions 112” or “linear portions 112”.

  The plurality of radial linear portions 111 and the plurality of concentric linear portions 112 form a mesh. Note that the center of the circle of the gasket portion 120 is located near the center of the flow path in the intake pipe when the intake noise reduction device 100 is disposed in the intake pipe. That is, the rectifying net portion 110 includes a plurality of radial linear portions 111 extending radially from the vicinity of the center of the flow path in the intake pipe and a plurality of concentric circles provided from the vicinity of the center of the flow path in the intake pipe. It can also be said that it is composed of concentric linear portions 112.

  In the rectifying net portion 110 configured as described above, the mesh near the center of the circle of the gasket portion 120 is fine, and the mesh is coarser as the distance from the center increases. That is, in a state where the intake noise reduction device 100 is disposed in the intake pipe, the mesh of the rectifying net unit 110 is fine in the vicinity of the center of the flow path in the intake pipe and becomes coarser as it goes away from the vicinity of the center. In this embodiment, the plurality of radial linear portions 111 are set to have substantially the same angle between the adjacent radial linear portions 111. In addition, in the plurality of concentric linear portions 112, the radial intervals between adjacent concentric linear portions 112 are set to be substantially equal. As a result, the mesh of the rectifying net portion 110 is fine near the center of the circle of the gasket portion 120 and becomes rougher as it goes away from the center.

  In the present embodiment, as shown in FIG. 2, the distance between the throttle valve 300 and the rectifying net portion 110 is shorter than the length of the valve body portion of the throttle valve 300. Therefore, the rectifying net part 110 is provided so as to occupy a substantially half region inside the gasket part 120 having a circular planar shape so that the throttle valve 300 does not hit the rectifying net part 110. The remaining substantially semicircular region is a cavity. In a state where the intake sound reduction device 100 is disposed in the intake pipe, the semicircular region where the rectifying net portion 110 is provided is disposed at the upper portion, and the hollow semicircular region is disposed at the lower portion. . Thus, even when the throttle valve 300 is fully opened, the throttle valve 300 does not hit the rectifying net 110 (see FIG. 2).

<Details of linear part>
In particular, with reference to FIGS. 3 and 4, the linear portion constituting the rectifying net portion 110 will be described in more detail. 3 and 4 each show an example of the cross-sectional shape of the linear portion. 3 corresponds to the BB cross-sectional view in FIG. 1 and also corresponds to the CC cross-sectional view. 4 also corresponds to the BB cross-sectional view in FIG. 1 and also corresponds to the CC cross-sectional view. In the present embodiment, the cross-sectional shape and dimensions of the radial linear portion 111 and the concentric linear portion 112 are the same.

  As described above, the rectifying net unit 110 according to the present embodiment is configured by an elastic body. For this reason, the rectifying net portion 110 inherently has a property of elastically deforming. As described in the background art, there is a concern that the rectification function is deteriorated when the rectification net unit 110 is deformed by the flow of air flowing in the intake pipe. Therefore, in the present embodiment, the shape and dimensions of the linear portions 111 and 112 can be devised to suppress the deformation of the linear portions 111 and 112 caused by the air flow. Thereby, the deformation | transformation of the rectification | straightening net | network part 110 is suppressed, and it is possible to suppress the fall of a rectification function.

  As shown in FIGS. 3 and 4, the linear portions (radial linear portions 111 and concentric linear portions 112) are configured so that the depth (distance from the front surface to the back surface) is wider than the width. Has been. That is, the cross sections of the linear portions 111 and 112 are elongated on the depth side. In addition, in FIG. 3, about the linear parts 111 and 112, the cross section in case the edge part of the surface side and the edge part of a back surface side are comprised by a curved surface is shown. Further, FIG. 4 shows a cross section in the case where the linear portions 111 and 112 are configured so that the front-side end and the back-side end have a sharp shape. However, the linear portion in the present invention may be configured so that the depth is wider than the width and the cross section is elongated on the depth side. Therefore, the cross-sectional shape of the linear portion is not limited to the shape shown in FIG. 3 or the shape shown in FIG.

  For the linear portions 111 and 112, when the width is W and the depth is T, T ÷ W is set to be 2 to 5 times. More specifically, the width W of the linear portions 111 and 112 is set to 0.7 mm or more and 2 mm or less, and the depth T is set to 2 mm or more and 6 mm or less. It is preferable that the following is set. For example, in the example shown in FIG. 3, the width W can be set to 1 mm and the depth T can be set to 3 mm. In the example shown in FIG. 4, the width W can be set to 1 mm, the depth T can be set to 3 mm, and the width T1 in the depth direction of the parallel surface portions on both side surfaces can be set to 1.5 mm.

  Here, the air flowing in the intake pipe is easier to flow as the width W of the linear portions 111 and 112 is narrower, and as the width W is wider, the resistance increases, and the mesh becomes narrower, so that it becomes difficult to flow. Thus, from the viewpoint of easy air flow, the width W of the linear portions 111 and 112 is preferably narrow. On the other hand, the narrower the width W of the linear portions 111 and 112, the lower the strength. The linear portions 111 and 112 are easily deformed, and the rectifying net portion 110 is easily deformed. Therefore, as described above, the width W is preferably set to 0.7 mm or more and 2 mm or less so that the width W is narrowed as much as possible within a range where the strength of the linear portions 111 and 112 does not cause a problem.

  In this embodiment, the depth T is wider than the width W of the linear portions 111 and 112 so that the linear portions 111 and 112 are not easily deformed by the air flow. . As the depth T is wider, the linear portions 111 and 112 are more difficult to deform. Further, the wider the depth T, the greater the rectifying effect. On the other hand, if the depth T is too wide, the moldability when the intake sound reducing device 100 is molded with a mold is degraded. Therefore, as long as the ratio of the depth T to the width W is increased and the depth T is widened as much as possible without adversely affecting the formability, T ÷ W is set to 2 to 5 times as described above. The depth T is preferably set to 2 mm or more and 6 mm or less.

<Excellent points of the intake sound reduction device according to this embodiment>
According to the intake sound reduction device 100 according to the present embodiment, the linear portions 111 and 112 provided in a mesh shape constituting the rectifying net portion 110 have a depth T that is 2 to 5 times the width W. Is set to Accordingly, since the depth T is wide even if the width W is narrow, the linear portions 111 and 112 can be prevented from being deformed by the air flow without narrowing the mesh. In particular, in this embodiment, the width W of the linear portions 111 and 112 is set to 0.7 mm or more and 2 mm or less, and the depth T is set to 2 mm or more and 6 mm or less, and T ÷ W is twice or more. It is set to 5 times or less. Thereby, it can suppress that the linear parts 111 and 112 deform | transform with the flow of air suitably, without narrowing a mesh. That is, it is possible to suppress the rectifying net unit 110 from being deformed by the air flow. As described above, it is possible to suppress a decrease in the intake air amount while suppressing a decrease in the rectification function.

  Here, at the beginning of opening of the throttle valve 300, the air flows from two locations farthest from the rotation shaft of the throttle valve 300 become mainstream. That is, in the present embodiment, the upper air flow and the lower air flow are mainstream. In the intake noise reduction device 100 according to the present embodiment, the mesh of the rectifying net portion 110 disposed on the downstream side of the throttle valve 300 is fine in the vicinity of the center of the flow path in the intake pipe, and becomes rougher as the distance from the vicinity of the center increases. It is comprised so that it may become. As a result, the air tends to flow in a coarse area of the mesh, so that the air is rectified so as to flow more in a region farther from the vicinity of the center in the intake pipe. However, in the present embodiment, since the rectifying net portion 110 is disposed in the upper half region of the intake pipe, the air flow is rectified as described above with respect to the air flow on the upper side. That is, the downward flow of the upper air flow can be reduced. Therefore, the merging of the air flow on the upper side and the air flow on the lower side can be suppressed. Thereby, abnormal noise can be suppressed.

  Further, the rectifying net portion 110 according to the present embodiment includes a plurality of radial linear portions 111 extending radially outward from the vicinity of the center of the flow path in the intake pipe, and a plurality of concentric circles provided concentrically from the vicinity of the center. A mesh is formed by the linear portions 112. Thereby, it is possible to realize the rectifying net unit 110 in which the mesh in the vicinity of the center of the flow path in the intake pipe is fine and the mesh becomes coarser as the distance from the center increases.

  Further, in the present embodiment, the rectifying net portion 110 is elastically deformed to some extent although the deformation amount is suppressed. However, as described above, since a mesh is formed by the plurality of radial linear portions 111 and the plurality of concentric linear portions 112, the shape of the rectifying net portion 110 projected in the air flowing direction is Little change before and after deformation. Therefore, the rectification function is stably exhibited. Further, when the rectifying net portion 110 is elastically deformed, a uniform force acts on the radial linear portion 111 and a uniform force acts on the entire rectifying net portion 110, so that the durability is improved. Excellent.

  With reference to FIG.5 and FIG.6, the test regarding the reduction effect of an intake sound and a test result are demonstrated. FIG. 5 is a schematic cross-sectional view of an apparatus for measuring the transition of sound pressure. FIG. 6 is a graph showing the measurement result of the transition of the sound pressure when the intake sound reduction device is not used.

  As shown in FIG. 5, a test apparatus comprising a test throttle body 220X and a resin-made bottomed cylindrical member 210X fixed to the tip of the throttle body 220X is used to test the effect of reducing intake noise. A test was conducted. This test apparatus is configured such that the test sample 100X is mounted between the end of the throttle body 220X and the end of the bottomed cylindrical member 210X. The inner diameters of the throttle body 220X and the bottomed cylindrical member 210X are set to 60 mm, and the distance from the throttle valve 300X to the test sample 100X is set to 24 mm. The microphone 400 for measuring the sound pressure is disposed at a position 30 mm away from the test sample 100X in the axial direction and 100 mm away from the outer peripheral surface of the bottomed cylindrical member 210X.

The following tests were performed using the test apparatus configured as described above. First, the throttle valve 300X is closed to make the inside of the bottomed cylindrical member 210X sealed, and the inside of this sealed space is maintained at -70 kPa. And it is 9 at an angular velocity of 1800-2400 deg / s.
The throttle valve 300X is opened until it rotates by 0 °, and the sound pressure is measured by the microphone 400, and the change of the sound pressure with respect to the elapsed time is graphed.

  Here, tests were conducted for the case of a gasket not provided with a rectifying net, the case of the conventional example, the case of the comparative example, and the case of the intake sound reduction device 100 according to the present example. In addition, as the test sample 100X according to the conventional example, an intake sound reduction device including a grid-like metal rectifying net portion inside a rubber gasket portion was used. More specifically, the rectifying net portion is provided over the entire area inside the gasket portion, and the linear member forming the lattice has an outer diameter of 0.5 mm and a circular cross section. In addition, the lattice used was a square having a length and width of 6 mm. As the test sample 100X according to the comparative example, the planar shape is the configuration shown in FIG. 1, and a rubber rectifying net portion including a linear portion having a width and a depth of 1 mm is provided inside the rubber gasket portion. An intake noise reduction device was used. As an intake sound reduction device 100 according to the present embodiment, a rubber rectifying net portion 110 composed of linear portions 111 and 112 having a width W of 1 mm and a depth T of 3 mm is provided inside a rubber gasket portion 120. The intake sound reduction device 100 was used.

  FIG. 6 is a graph showing changes in elapsed time and sound pressure when a gasket that does not include a rectifying net is used as the test sample 100X. When the overall value based on the measurement result in this case is 1, the overall value is about 0.7 in the conventional example, and the overall value is about 0.8 in the comparative example. The overall value was about 0.6. From the above, it was found that the intake sound can be effectively reduced in the intake sound reduction device 100 according to the present embodiment. Moreover, it turned out that the direction of the intake sound reduction device 100 according to the present embodiment can reduce the intake sound compared to the conventional example including a metal rectifying net.

(Example 2)
FIG. 7 shows a second embodiment of the present invention. In the said Example 1, the case where a rectification | straightening net | network part was provided in the substantially semicircle area | region inside a gasket part was shown. In a present Example, the structure in case a rectification | straightening net | network part is provided over the whole area | region inside a gasket part is shown. Since other configurations and operations are the same as those in the first embodiment, the same components are denoted by the same reference numerals and description thereof is omitted.

  The intake noise reduction device 100 according to the present embodiment is also composed of the rectifying net portion 110 and the gasket portion 120 as in the case of the first embodiment. The intake sound reduction device 100 is formed of an elastic body such as various rubber materials or resin elastomers, and the rectifying net portion 110 and the gasket portion 120 are integrated.

  The rectifying net portion 110 in the present embodiment has a plurality of radial linear portions extending radially outward from the center of the circle of the gasket portion 120 having a circular planar shape, as in the case of the first embodiment. 111 and a plurality of concentric linear portions 112 provided concentrically from the center of the circle. In the case of the first embodiment, the rectifying net portion 110 is provided so as to occupy almost half of the inner area of the gasket portion 120 having a circular planar shape. The rectifying net part 110 is provided over the entire area inside the gasket part 120. About the structure regarding the shape (cross-sectional shape etc.) of the linear parts 111 and 112, and another structure, it is the same as the structure shown in the said Example 1. FIG.

Also in this embodiment, the same effect as in the case of the first embodiment can be obtained. In the case of the present embodiment, since the rectifying net portion 110 is provided over the entire area inside the gasket portion 120, the lower air flow is the same as the upper air flow. The air flow can be rectified. Therefore, abnormal noise can be further suppressed. Therefore, when the intake noise reduction device 100 is disposed at a position where the throttle valve 300 does not abut, the intake noise reduction device 100 according to the present embodiment may be employed.

(Other)
In each of the above embodiments, the case where the pipe of the intake pipe is formed in a cylindrical shape has been shown. In connection with this, the case where the gasket part 120 in the intake sound reduction device 100 is formed in an annular shape is shown. However, the intake noise reduction device according to the present invention can also be applied when the pipe of the intake pipe is not cylindrical. For example, when the pipe of the intake pipe is rectangular when viewed in a cross section perpendicular to the air flow direction, the gasket 120 may be configured to have a rectangular planar shape. In this case as well, the rectifying net portion 110 provided inside the gasket portion 120 can be the same as the configuration shown in the first and second embodiments. However, in this case, it goes without saying that, for the plurality of concentric linear portions, some of the outer concentric linear portions are not semicircular or circular, but arcuate.

  Further, in each of the above embodiments, the mesh of the rectifying net portion 110 is provided with a plurality of radial linear portions extending radially outward from the center of the flow path in the intake pipe and a plurality of concentric circles provided from the vicinity of the center. The structure in the case of being formed by the concentric circular linear portions is shown. By adopting such a configuration, the shape of the rectifying net unit 110 projected in the direction of air flow has the advantage that there is little change before and after deformation. However, in the present embodiment, the shape and dimensions of the linear portions 111 and 112 are devised, so that the deformation of the rectifying net portion 110 is suppressed. Therefore, you may employ | adopt another structure about the structure regarding arrangement | positioning of a linear part. However, in order to effectively suppress the merging of the two air flows, the rectifying net portion is configured so that the mesh near the center of the flow path in the intake pipe is fine, and the mesh becomes coarser as the distance from the center increases. desirable. For example, when a lattice-like mesh is formed by a plurality of linear portions extending in the vertical and horizontal directions, the vertical and horizontal intervals are not made uniform, but the intervals closer to the center of the flow path in the intake pipe A rectifying net portion having a fine mesh near the center of the flow path in the pipe and having a coarse mesh as the distance from the center can be obtained.

DESCRIPTION OF SYMBOLS 100 Intake sound reduction device 110 Rectification net part 111, 111a, 111b, 111c, 111d, 111e, 111f, 111g (radial) linear part 112, 112a, 112b, 112c, 112d (concentric circular) linear part 120 gasket 200 Intake pipe 210 Intake manifold 211 Notch 220 Throttle body 300 Throttle valve

Claims (4)

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 air intake sound reducing device according to claim 1, wherein when the width of the linear portion is W and the depth is T, T ÷ W is set to be 2 to 5 times.   The width W of the linear part is set to 0.7 mm or more and 2 mm or less, and the depth T is set to 2 mm or more and 6 mm or less, and T ÷ W is set to 2 times or more and 5 times or less. The intake sound reduction device according to claim 1, wherein   3. The intake noise reduction device according to claim 1, wherein the rectifying net portion is configured such that the mesh near the center of the flow path in the intake pipe is fine and the mesh becomes coarser as the distance from the center increases.   The rectifying net portion includes a plurality of radial linear portions extending radially outward from the vicinity of the center of the flow path in the intake pipe, and a plurality of concentric linear portions provided concentrically from the vicinity of the center. The intake sound reducing device according to claim 3, wherein a mesh is formed.