JP6610873B2 - Intake device for internal combustion engine - Google Patents

Description

  The present invention relates to an intake device for an internal combustion engine in which a resonator is provided in an intake pipe so as to suppress resonance noise of the intake system.

  Some intake pipes of internal combustion engines include a resonator that suppresses resonance noise of the intake pipe (see, for example, Patent Document 1). The resonator is substantially equal in width to the intake pipe, and is formed on the lower surface side of the intake pipe. In such a resonator, in order to adjust the frequency of the intake sound to be attenuated, the position and capacity of the resonator connected to the intake pipe are appropriately adjusted.

  For example, in the case of absorbing a low frequency, it is necessary to increase the volume of the resonator. In such a case, the resonator disclosed in Patent Document 1 needs to be expanded in the width direction or further expanded downward. However, the position and capacity of the resonator are limited by the arrangement of various devices such as an internal combustion engine, an intake pipe, and an air cleaner arranged in the intake pipe. In other words, if the volume of the resonator is changed so as to absorb the intake sound of a specific frequency, the resonator becomes large and may interfere with various devices.

Japanese Patent No. 3923198

  In view of the above circumstances, an object of the present invention is to provide an intake device for an internal combustion engine that is compact and includes a resonator that can attenuate a desired frequency.

According to a first aspect of the present invention for solving the above-described problems, a first resonator and a second resonator each having a first volume chamber and a second volume chamber communicating with an intake passage for supplying air to an internal combustion engine, A first member, a second member, and a third member that form one resonator and the second resonator, wherein the first resonator is formed by the first member and the second member, and the second member The resonator is formed by the second member and the third member , the intake passage is formed by the first member and the second member, and the first resonator is formed by the intake passage in a plan view. And the second resonator overlaps with the intake passage in a plan view and is formed on both sides of the intake passage .

In the first aspect, the two first resonators and the second resonator can be arranged so as to overlap in a plan view. In other words, the air intake device can reduce the area occupied in the plane as compared with the case where the first resonator and the second resonator are arranged so as not to overlap each other in plan view. Thereby, an intake device can be made into a compact structure, without enlarging. And the intake sound of a desired frequency can be attenuated by setting suitably the volume of the volume chamber of two 1st resonators and a 2nd resonator. According to this aspect of the present invention, there is provided an intake device for an internal combustion engine that includes a first resonator and a second resonator that are compact and can attenuate a desired frequency.
The intake device can be made more compact than when the intake flow path is not formed by the first member, the second member, and the third member.
Compared with the case where the intake flow path and the second resonator are arranged so as not to overlap in plan view, the area occupied in the plane can be reduced. Thereby, an intake device can be made into a more compact size.

  According to a second aspect of the present invention, in the internal combustion engine intake device described in the first aspect, the volume of the first volume chamber is different from the volume of the second volume chamber. In the intake system.

  In the second aspect, by using together the first resonator and the second resonator having different volume chamber volumes, it is possible to attenuate the intake sound in different frequency bands.

According to a third aspect of the present invention, in the intake device for an internal combustion engine described in the first or second aspect, the first resonator is branched from the intake passage and communicates with the first volume chamber. The second resonator includes a second communication pipe that branches from the intake flow path and communicates with the second volume chamber, and at least one of the first communication pipe or the second communication pipe includes: An intake device for an internal combustion engine, wherein the intake device extends in a direction along the air flow of the intake passage.

In the third aspect, even if the second communication pipe is lengthened, the second communication pipe remains compact so as not to interfere with other devices, and can be formed longer to effectively attenuate the low-frequency intake sound. .

According to a fourth aspect of the present invention, in the intake device for an internal combustion engine according to the third aspect, the length of the first communication pipe is different from the length of the second communication pipe. In the intake system.

In the fourth aspect, by using together the first communication pipe and the second communication pipe having different lengths, it is possible to attenuate the intake sound in different frequency bands.

A fifth aspect of the present invention, an intake system for an internal combustion engine described in the third or fourth aspect, the intake passage, from the upstream side toward the downstream side made form so as to be inclined downward, The first volume chamber is formed on one side of the intake flow path in a plan view, and the second volume chamber is formed over both sides of the intake flow path in a plan view, The second communication pipe extends in a direction along the air flow of the intake flow path, and the discharge port connected to the second volume chamber of the second communication pipe is connected to the intake flow of the second communication pipe An intake device for an internal combustion engine is located above an intake port connected to a road.

In the fifth aspect, it is possible to prevent water from entering the second resonator via the second communication pipe and changing the volume of the volume chamber of the second resonator due to the water. Thereby, the attenuation effect of the intake sound by the second resonator can be kept good.

  ADVANTAGE OF THE INVENTION According to this invention, the intake device of an internal combustion engine provided with the resonator which is compact and can attenuate a desired frequency is provided.

1 is a perspective view showing an external appearance of an intake device according to Embodiment 1. FIG. 1 is an exploded perspective view of an intake device according to Embodiment 1. FIG. FIG. 2 is a plan view of the intake device according to the first embodiment. It is the sectional view on the AA line of FIG. It is the BB sectional view taken on the line of FIG. It is CC sectional view taken on the line of FIG. It is the DD sectional view taken on the line of FIG. It is a top view of the intake device which shows the flow of air.

<Embodiment 1>
Hereinafter, modes for carrying out the present invention will be described. In addition, description of embodiment is an illustration and this invention is not limited to the following description.

  An intake device for an internal combustion engine according to this embodiment will be described with reference to FIGS. FIG. 1 is a perspective view showing the appearance of the intake device, and FIG. 2 is an exploded perspective view of the intake device. FIG. 3 is a plan view of the intake device. 4 is a cross-sectional view taken along line AA in FIG. 3, FIG. 5 is a cross-sectional view taken along line BB in FIG. 3, FIG. 6 is a cross-sectional view taken along line CC in FIG. FIG. In the plan view of FIG. 3, the third member is not shown. A cross section taken along the line AA is a cross section passing through the first resonator 20, the second resonator 30, the intake passage 10, and the second discharge port 121. A cross section taken along line BB is a cross section passing through the first resonator 20, the second resonator 30, the first communication pipe 91, the intake flow path 10, and the second discharge port 121. The cross-sectional view taken along the line CC is a cross section passing through the second resonator 30, the intake flow path 10, and the second communication pipe 92. The cross-sectional view along the line DD is a cross section passing through the second resonator 30, the intake flow path 10, and the second intake port 120. The X direction represents the longitudinal direction of the automobile, the Y direction represents the width direction of the automobile, and the Z direction represents the height direction of the automobile.

  An intake device 1 for an internal combustion engine according to the present embodiment includes a first resonator 20, a second resonator 30, and a first member 40, a second member 50, and a second member that form the first resonator 20 and the second resonator 30. And three members 60.

  The intake device 1 of the present embodiment includes an intake passage 10. The intake passage 10 is a passage for air supplied to an internal combustion engine (not shown). The intake flow path 10 of the present embodiment includes an upstream intake flow path 11, a downstream intake flow path 12, and an inclined intake flow path 13 between the upstream intake flow path 11 and the downstream intake flow path 12.

  The upstream intake flow path 11 is a flow path that has an intake port (not shown) that takes in air at one end side and extends rearward (rear in the X direction). The inclined intake passage 13 is a passage that is continuous from the upstream intake passage 11 and is inclined downward toward the rear. The downstream intake passage 12 is a passage that continues from the inclined intake passage 13 and extends rearward. The rear side of the downstream intake passage 12 is connected to an internal combustion engine (not shown). A device such as an air cleaner may be provided on the downstream side of the downstream intake flow path 12 on the upstream side of the internal combustion engine.

  The first resonator 20 includes a first volume chamber 81 that is a space portion having a predetermined volume, and a first communication pipe 91. Similarly, the second resonator 30 includes a second volume chamber 82 that is a space portion having a predetermined volume, and a second communication pipe 92. The first resonator 20 is formed by a first member 40 and a second member 50. The second resonator 30 is formed by the second member 50 and the third member 60. Specifically, the first member 40, the second member 50, and the third member 60 are joined in order from below in the vertical direction (Z direction). That is, the first member 40 is bonded to the lower surface side of the second member 50, and the third member 60 is bonded to the upper surface side of the second member 50. Although the 1st member 40, the 2nd member 50, and the 3rd member 60 are what shape | molded resin, for example, there is no limitation in material in particular.

  The first communication pipe 91 of the first resonator 20 is a flow path that branches from the intake flow path 10 and communicates with the first volume chamber 81. The second communication pipe 92 of the second resonator 30 is a flow path that branches from the intake flow path 10 and communicates with the second volume chamber 82. The first communication pipe 91 and the second communication pipe 92 are also formed by the first member 40, the second member 50, and the third member 60.

  The first member 40 is a member that is joined to the second member 50 and forms the first resonator 20 together with the second member 50. In the present embodiment, the first member 40 is a member that forms the intake passage 10 together with the second member 50.

  Specifically, the first member 40 is provided with a lower intake flow path forming portion 41 that forms a part of the intake flow path 10. The lower intake flow path forming portion 41 is formed in a groove shape having a concave cross section that opens to the second member 50 side. Further, in the lower intake flow passage forming portion 41, the portions that become the upstream intake flow passage 11 and the downstream intake flow passage 12 are substantially horizontal, and the portions that become the inclined intake flow passage 13 are inclined downward toward the downstream side. ing.

  The first member 40 is provided with a lower first communication pipe forming portion 42 that forms a part of the first communication pipe 91. The lower first communication tube forming portion 42 is formed in a groove shape having a concave cross section that opens to the second member 50 side. The lower first communication pipe forming portion 42 communicates a portion of the lower intake flow passage forming portion 41 that becomes the inclined intake flow passage 13 with a lower first volume chamber forming portion 43 described later. An opening that is a boundary with the lower intake flow path forming portion 41 of the lower first communication pipe forming portion 42 is referred to as a lower first suction port 47, and the lower first of the lower first communication pipe forming portion 42 is first. An opening serving as a boundary with the volume chamber forming portion 43 is referred to as a lower first discharge port 48.

  The first member 40 is provided with a lower first volume chamber forming portion 43 that forms a part of the first volume chamber 81. The lower first volume chamber forming portion 43 has a substantially rectangular shape in plan view and is formed in a groove shape having a concave cross section. The lower first volume chamber forming portion 43 communicates with the lower first communication tube forming portion 42.

  The first member 40 is provided with a lower second communication pipe forming portion 44 that forms a part of the second communication pipe 92. The lower second communication pipe forming portion 44 is formed in a groove shape having a concave cross section that opens to the second member 50 side. Further, the lower second communication pipe forming part 44 extends along the lower intake flow path forming part 41. The lower second communication pipe forming portion 44 is inclined downward from the front to the rear in the vehicle front-rear direction.

  Such a lower intake flow path forming part 41 and the lower second communication pipe forming part 44 are separated by a wall part 45. A part of the wall 45 is cut away to form a lower second suction port 46. Via the lower second suction port 46, the lower intake flow path forming portion 41 and the downstream one end portion of the lower second communication pipe forming portion 44 communicate with each other.

  The second member 50 is a member that is joined to the first member 40 and the third member 60, forms the first resonator 20 together with the first member 40, and forms the second resonator 30 together with the third member 60. In the present embodiment, the second member 50 is a member that forms the intake passage 10 together with the first member 40.

  The second member 50 is provided with an upper intake flow path forming portion 51 that forms a part of the intake flow path 10. The upper intake flow path forming part 51 is formed in a groove shape having a concave cross section that opens to the first member 40 side. Further, the upper intake flow passage forming portion 51 is inclined downward from the front to the rear in the vehicle front-rear direction in accordance with the inclination of the lower intake flow passage formation portion 41.

  The second member 50 is provided with an upper first communication pipe forming portion 52 that forms a part of the first communication pipe 91. The upper first communication pipe forming portion 52 is formed in a groove shape having a concave cross section that opens to the first member 40 side. The upper first communication pipe forming portion 52 allows the inclined intake flow passage 13 in the intake flow passage 10 to communicate with an upper first volume chamber forming portion 53 described later. The opening that becomes the boundary between the upper first communication pipe forming part 52 and the upper intake flow path forming part 51 is referred to as an upper first suction port 58, and the upper first volume chamber forming part 53 of the upper first communication pipe forming part 52. The opening serving as the boundary is referred to as the upper first discharge port 59.

  The second member 50 is provided with an upper first volume chamber forming portion 53 that forms a part of the first volume chamber 81. The upper first volume chamber forming portion 53 has a substantially rectangular shape in a plan view (a plan view when the second member 50 side is viewed from the first member 40 side), although not particularly illustrated, and is formed in a groove shape having a concave section. ing. The upper first volume chamber forming portion 53 communicates with the upper first communication tube forming portion 52.

  The second member 50 is provided with an upper second communication pipe forming portion 54 that forms a part of the second communication pipe 92. The upper second communication tube forming portion 54 is formed in a groove shape having a concave cross section that opens to the first member 40 side. Further, the upper second communication pipe forming portion 54 extends along the lower intake flow passage forming portion 41. The upper second communication pipe forming portion 54 is inclined downward from the front to the rear in the vehicle front-rear direction.

  The upper intake flow path forming portion 51 and the upper second communication pipe forming portion 54 are separated by a wall portion 55. Further, a part of the wall portion 55 is cut out to form an upper second suction port 56. Via the upper second suction port 56, the upper intake flow path forming portion 51 and the one end portion on the downstream side of the upper second communication tube forming portion 54 communicate with each other.

  The second member 50 is provided with a lower second volume chamber forming portion 57 that forms a part of the second volume chamber 82. In the present embodiment, the second member 50 is provided with a wall portion 150 on the upper surface side (surface on the third member 60 side), and a region inside the wall portion 150 is a lower second volume chamber forming portion 57. It has become. The wall 150 is formed so as to surround the first resonator 20, the inclined intake passage 13 in the intake passage 10, and the second outlet 121 and the inclined portion in the second communication pipe 92 in plan view. .

  The second member 50 is provided with a second discharge port 121 communicating with one end portion on the upstream side of the upper second communication tube forming portion 54. The second discharge port 121 is a hole that penetrates the second member 50 in the thickness direction and communicates the upper second communication tube forming portion 54 and the lower second volume chamber forming portion 57. Further, the second discharge port 121 faces the center side of the lower second volume chamber forming portion 57. As a result, the flow of the air exiting from the second discharge port 121 is controlled toward the center side of the second volume chamber 82. Thus, since air flows in toward the center side of the second volume chamber 82, it is easy to obtain an intake sound attenuation effect.

  The third member 60 is a member that is joined to the second member 50 and forms the second resonator 30 together with the second member 50.

  The third member 60 is provided with an upper second volume chamber forming portion 61 that forms a part of the second volume chamber 82. The upper second volume chamber forming portion 61 opens in substantially the same shape as the lower second volume chamber forming portion 57 and is formed in a groove shape having a concave cross section.

  The first device 40, the second member 50, and the third member 60 are joined and integrated to form the intake device 1 having the intake flow path 10, the first resonator 20, and the second resonator 30. .

  That is, the first member 40 and the second member 50 form a single intake passage 10 in which the openings of the lower intake passage formation portion 41 and the upper intake passage formation portion 51 are joined to each other. .

  Further, the first member 40 and the second member 50 form a single first communication pipe 91 in which the openings of the lower first communication pipe forming portion 42 and the upper first communication pipe forming portion 52 are joined together. Has been. Further, the first member 40 and the second member 50 form one first volume chamber 81 in which the openings of the lower first volume chamber forming portion 43 and the upper first volume chamber forming portion 53 are joined together. ing. A first resonator 20 including the first volume chamber 81 and the first communication pipe 91 is formed.

  Further, the first member 40 and the second member 50 form a single second communication pipe 92 in which the openings of the lower second communication pipe forming portion 44 and the upper second communication pipe forming portion 54 are joined together. Has been. Further, the second member 50 and the third member 60 form one second volume chamber 82 in which the openings of the lower second volume chamber forming portion 57 and the upper second volume chamber forming portion 61 are joined together. . And the 2nd resonator 30 provided with these 2nd volume chambers 82 and the 2nd communicating pipe 92 is formed.

  Further, the first suction port 110, the first discharge port 111, and the second suction port 120 are formed by joining the first member 40 and the second member 50. That is, the first suction port 110 is formed by the lower first suction port 47 and the upper first suction port 58. The lower first discharge port 48 and the upper first discharge port 59 form one first discharge port 111. One lower suction port 120 is formed by the lower second suction port 46 and the upper second suction port 56.

  The portion of the second member 50 to which the third member 60 is joined is the top surface 151 of the wall 150 that forms the lower second volume chamber forming portion 57. The top surface 151 is a substantially horizontal surface facing the third member 60 side. On the other hand, although not particularly illustrated, a portion of the third member 60 to which the second member 50 is joined is also a substantially horizontal plane that has the same shape as the top surface 151 and faces the second member 50 side.

  Thus, since the 2nd member 50 and the 3rd member 60 are joining of horizontal surfaces, a clearance gap is hard to produce. Thereby, the airtightness of the second volume chamber 82 formed by the second member 50 and the third member 60 can be improved.

  In the present embodiment, the intake passage 10 has an inclined intake passage 13 that is inclined. In order to form the inclined intake passage 13, the upper intake passage formation portion 51 of the second member 50 is inclined. Thus, even if the 2nd member 50 contains a part which inclined, the joint surface with the 3rd member 60 can be made into a horizontal surface by providing the wall part 150. FIG.

  As shown in FIG. 4, the upper portion of the first volume chamber 81 projects into the second volume chamber 82. Specifically, the upper first volume chamber forming portion 53 constituting the first volume chamber 81 protrudes toward the third member 60 side from the top surface 151 of the wall portion 150.

  The first volume chamber 81 thus protrudes into the second volume chamber 82, so that the volume of the first volume chamber 81 can be further increased. That is, in order to expand the first volume chamber 81, it may be expanded in the Z direction, and it is not necessary to expand in the X direction and the Y direction. As a result, the size occupied by the first volume chamber 81 in the XY plane can be reduced.

  Further, since the first volume chamber 81 does not need to be expanded in the XY plane, the first volume chamber 81 has a simple shape such as a substantially rectangular parallelepiped shape (the shape in plan view is substantially square) as in this embodiment. be able to. By making the first volume chamber 81 a rectangular parallelepiped shape, the air discharged from the first discharge port 111 of the first communication pipe 91 can be sent toward the center of the first volume chamber 81. As a result, air can be diffused quickly and uniformly from the first communication pipe 91 into the first volume chamber 81, and the desired frequency of the intake sound can be easily attenuated.

  If the first volume chamber 81 is expanded in the XY plane, a plurality of small chambers may be connected to form one volume chamber. Such a volume chamber may have, for example, an L shape or a concave shape in plan view, and may have a configuration in which the depth differs for each small chamber. In such a volume chamber, air is unevenly diffused and it is difficult to attenuate a desired frequency. On the other hand, in the present embodiment, the first volume chamber 81 has a single rectangular parallelepiped shape in which the volumes of such small chambers are collected in the height direction. For this reason, the first volume chamber 81 has a volume equivalent to that of a volume chamber formed by connecting a plurality of small chambers, and can be shaped to diffuse air quickly and uniformly, and a desired frequency can be obtained. Can be attenuated.

  As described above, in the intake device 1, the first resonator 20 is formed by the first member 40 and the second member 50, and the second resonator 30 is formed by the second member 50 and the third member 60. The first volume chamber 81 of the first resonator 20 communicates with the intake flow path 10 via the first communication pipe 91, and the second volume chamber 82 of the second resonator 30 passes via the second communication pipe 92. It communicates with the intake flow path 10.

The air flow in the intake device 1 having such a configuration will be described with reference to FIG. FIG. 8 is a plan view of the intake device showing the flow of air. In the figure, the first member is not shown.
As indicated by an arrow L in FIG. 8, external air flows into the intake passage 10 and is sent from the downstream intake passage 12 (see FIG. 1) to the internal combustion engine. 5 and 8, a part of the air that has flowed into the intake passage 10 flows into the first communication pipe 91 and reaches the first volume chamber 81. Furthermore, as indicated by an arrow N in FIGS. 4, 5, 7, and 8, a part of the air that has flowed into the intake passage 10 flows into the second communication pipe 92 and reaches the second volume chamber 82. To do.

  The intake device 1 for an internal combustion engine having the above-described configuration is provided with the two first resonators 20 and the second resonator 30 by the first member 40, the second member 50, and the third member 60 that are integrally joined. ing. By setting it as such a structure, as shown in FIG. 8, it can be set as the arrangement | positioning which the two 1st resonators 20 and the 2nd resonator 30 overlap in planar view. In other words, the intake device 1 can reduce the area occupied in the plane as compared with the case where the first resonator 20 and the second resonator 30 are arranged so as not to overlap in plan view. Essentially, the two first resonators 20 and the second resonators 30 can be accommodated in the region of the second resonator 30 corresponding to one in plan view.

  Thereby, the intake device 1 can be made into a compact structure without increasing in size. And the intake sound of a desired frequency can be attenuated by setting the volume of the two first resonators 20 and the second resonator 30 as appropriate. Thus, according to the present invention, there is provided an intake device 1 for an internal combustion engine including the first resonator 20 and the second resonator 30 that are compact and have a volume capable of attenuating a desired frequency.

  In the intake device 1 of the present embodiment, the first volume chamber 81 of the first resonator 20 and the second volume chamber 82 of the second resonator 30 have different volumes. In the present embodiment, the volume of the first volume chamber 81 is smaller than the volume of the second volume chamber 82. According to Helmholtz's law, the lower the volume of the volume chamber, the higher the frequency of the intake sound, and the larger the volume of the volume chamber, the lower the frequency of the intake sound. Therefore, the high-frequency intake sound can be attenuated by the first volume chamber 81 having a relatively small volume, and the low-frequency intake sound can be attenuated by the second volume chamber 82 having a relatively large volume.

  Thus, by using together the 1st volume chamber 81 and the 2nd volume chamber 82 from which volumes differ, the intake sound of a different frequency band can be attenuated.

  In the intake device 1 of the present embodiment, the intake flow path 10 is formed by the first member 40, the second member 50, and the third member 60 together with the first resonator 20 and the second resonator 30. Thereby, compared with the case where the intake flow path 10 is not formed in the 1st member 40, the 2nd member 50, and the 3rd member 60, the intake device 1 can be made more compact.

  If the intake channel 10 is not formed in the first member 40, the second member 50, and the third member 60, the intake channel 10 is connected to the first member 40, the second member 50, and the third member 60. These tubular members (members corresponding to the first communication pipe 91 and the second communication pipe 92) must be provided separately. In this case, the number of parts is increased, and a space for arranging the parts is required, resulting in a slight increase in size. The intake device having a configuration in which the intake passage 10 is not formed in the first member 40, the second member 50, and the third member 60 is included in the invention described in the claims.

  In the intake device 1 of the present embodiment, the intake channel 10 and the first resonator 20 are formed by the first member 40 and the second member 50. Specifically, in the plan view shown in FIG. 3, the first volume chamber 81 of the first resonator 20 is formed on one side of the intake flow path 10 (one side in the Y direction). In the plan view shown in FIG. 3, the second volume chamber 82 of the second resonator 30 formed by the second member 50 and the third member 60 overlaps with the intake flow path 10 and both sides of the intake flow path 10 ( It is formed over both sides in the Y direction. In other words, the intake channel 10 and the first volume chamber 81 of the first resonator 20 are included in the region occupied by the second resonator 30 in plan view.

  According to the intake device 1 having such a configuration, the area occupied in the plane can be reduced as compared with the case where the intake flow path 10 and the second volume chamber 82 are arranged so as not to overlap in plan view. . Thereby, the intake device 1 can be arranged around the intake flow path 10 in a more compact size, and can be made more difficult to interfere with various devices mounted on the automobile. Therefore, the upper limit of the volume of the two first resonators 20 and the second resonator 30 can be increased, and the frequency of the intake sound to be attenuated can be more flexibly dealt with.

  In the intake device 1 of the present embodiment, the second communication pipe 92 extends in a direction (X direction) along the air flow in the intake flow path 10. For this reason, the space required for the second communication pipe 92 is only around the intake passage 10. Originally, since the vehicle is provided with a space for arranging the intake flow path 10, there is little possibility that the space required for forming the second communication pipe 92 interferes with other devices. That is, the second communication pipe 92 can be made long without interfering with other devices.

  Here, according to Helmholtz's law, the length of the second communication pipe 92 attenuates the low-frequency intake sound as it is longer. Therefore, even if the second communication pipe 92 is lengthened, it is difficult to interfere with other devices and remains compact, and can be formed longer to effectively attenuate the low-frequency intake sound.

  Further, the first volume chamber 81 of the first resonator 20 or the second volume chamber 82 of the second resonator 30 and the intake flow path 10 are not directly connected, and the first communication pipe 91 or the second communication pipe 92 are respectively connected. Is connected indirectly. Thereby, the frequency of the intake sound attenuated in the first volume chamber 81 and the second volume chamber 82 is set to a desired frequency only by appropriately adjusting the length and diameter of the first communication tube 91 and the second communication tube 92. can do.

  In the intake device 1 of the present embodiment, the length of the first communication pipe 91 is different from the length of the second communication pipe 92. Specifically, the length of the first communication pipe 91 is shorter than the length of the second communication pipe 92.

  As described above, according to Helmholtz's law, the length of the first communication pipe 91 and the second communication pipe 92 attenuates the low-frequency intake sound as it is long, and attenuates the high-frequency intake sound as it is short.

  Therefore, it is possible to attenuate the high frequency intake sound by the relatively short first communication pipe 91 and attenuate the low frequency intake sound by the relatively long second communication pipe 92. Thus, by using together the 1st communicating pipe 91 and the 2nd communicating pipe 92 from which length differs, the intake sound of a different frequency band can be attenuated.

  In particular, in the present embodiment, the first volume chamber 81 connected to the first communication pipe 91 attenuates high-frequency intake sound, and the second volume chamber 82 connected to the second communication pipe 92 is low-frequency intake sound. It is the volume which attenuates. That is, the first communication pipe 91 and the first volume chamber 81 are configured to attenuate high-frequency intake sound, and the second communication pipe 92 and the second volume chamber 82 are low-frequency intake sound. It is suitable for attenuating.

  Conventionally, in order to attenuate the intake sound having a desired frequency, it is necessary to change the volume of the volume chamber or the arrangement of the resonator with respect to the intake passage 10. In the intake device 1 of the present embodiment, the intake device 1 is arranged in accordance with the arrangement of various devices such as an internal combustion engine and air cleaners arranged before and after the intake device 1, and then the intake sound of a desired frequency is attenuated. The first communication pipe 91 and the second communication pipe 92, and the first volume chamber 81 and the second volume chamber 82 having a length and a diameter suitable for the above may be configured. Therefore, the intake device 1 can attenuate the intake sound of a desired frequency without being restricted by the arrangement of various devices such as an internal combustion engine.

  The intake passage 10 has an inclined intake passage 13 that is inclined downward from the upstream side toward the downstream side. The second communication pipe 92 is similarly inclined along the inclined intake passage 13. The second discharge port 121 is positioned above the second suction port 120 of the second communication pipe 92 in the vertical direction. According to the second communication pipe 92 having such a configuration, it is possible to prevent moisture from entering while rising. Therefore, it is possible to prevent the water from accumulating in the second volume chamber 82 via the second communication pipe 92 and changing its volume. Thereby, the attenuation effect of the intake sound by the second resonator 30 can be kept good.

  Further, in the second communication pipe 92, the second suction port 120 is located on the downstream side of the intake flow path 10, and the second discharge port 121 is located on the upstream side of the intake flow path 10. That is, the air flowing through the second communication pipe 92 is in the opposite direction to the air flow in the intake passage 10.

  According to such a configuration of the second communication pipe 92, even when moisture such as a water droplet enters the intake flow path 10 together with air, it is possible to further suppress the entry into the second communication pipe 92.

<Other embodiments>
Although one embodiment of the present invention has been described above, the present invention is not limited to the above-described embodiment. The present invention can be modified as appropriate without departing from the spirit of the present invention.
For example, in the above-described embodiment, the volumes of the first volume chamber 81 and the second volume chamber 82 are different, but they may be the same volume. Moreover, although the 1st resonator 20 was one, multiple may be sufficient. That is, a plurality of first resonators 20 may be formed by the first member 40 and the second member 50. Similarly, for the second resonator 30, a plurality of second resonators 30 may be formed by the second member 50 and the third member 60.

  In the first resonator 20, the first volume chamber 81 communicates with the intake flow path 10 through the first communication pipe 91, but is not limited thereto. That is, the first resonator 20 may have the first volume chamber 81 communicated directly with the intake flow path 10. Similarly for the second resonator 30, the second volume chamber 82 may directly communicate with the intake flow path 10.

  The intake passage 10 is formed by the first member 40 and the second member 50, but may be formed by the second member 50 and the third member 60. When the intake passage 10 is formed by the second member 50 and the third member 60, the first volume chamber 81 of the first resonator 20 overlaps the intake passage 10 in plan view and covers both sides of the intake passage 10. The second volume chamber 82 of the second resonator 30 is preferably formed on one side of the intake passage 10 in plan view. That is, the intake flow path 10, the first resonator 20, and the second resonator 30 of the intake device 1 of the first embodiment may be arranged upside down around the second member 50. Of course, arrangement | positioning of the intake flow path 10, the 1st resonator 20, and the 2nd resonator 30 is not limited to the above-mentioned embodiment.

  Although the 2nd communicating pipe 92 was formed so that the flow of the air of the intake passage 10 may be followed, it is not limited to this. Like the first communication pipe 91, the first communication pipe 91 may extend in a direction intersecting with the air flow in the intake passage 10.

  The intake passage 10 has the inclined intake passage 13, but is not necessarily limited to such an aspect. That is, the intake passage 10 does not have the inclined intake passage 13 and may be substantially parallel, or may be inclined upward from the upstream toward the downstream. Furthermore, the second discharge port 121 of the second communication pipe 92 does not need to be above the second suction port 120, and may be positioned at substantially the same height or below.

  The present invention can be used in the industrial field of automobiles.

DESCRIPTION OF SYMBOLS 1 Intake device 10 Intake flow path 20 1st resonator 30 2nd resonator 40 1st member 50 2nd member 60 3rd member 81 1st volume chamber 82 2nd volume chamber 91 1st communication pipe 92 2nd communication pipe 110 1st Suction port 111 First outlet 120 Second inlet 121 Second outlet

Claims (5)

A first resonator and a second resonator each having a first volume chamber and a second volume chamber communicating with an intake passage for supplying air to the internal combustion engine;
A first member, a second member, and a third member that form the first resonator and the second resonator;
The first resonator is formed by the first member and the second member,
The second resonator is formed by the second member and the third member ,
The intake passage is formed by the first member and the second member,
The first resonator is formed on one side of the intake passage in plan view,
The intake device for an internal combustion engine, wherein the second resonator overlaps with the intake passage in a plan view and is formed on both sides of the intake passage . The intake device for an internal combustion engine according to claim 1,
An intake device for an internal combustion engine, wherein the volume of the first volume chamber is different from the volume of the second volume chamber. In the intake device for an internal combustion engine according to claim 1 or 2 ,
The first resonator includes a first communication pipe that branches from the intake passage and communicates with the first volume chamber,
The second resonator includes a second communication pipe that branches from the intake passage and communicates with the second volume chamber,
At least one of the first communication pipe or the second communication pipe extends in a direction along the air flow in the intake flow path. The intake device for an internal combustion engine according to claim 3 ,
An intake device for an internal combustion engine, wherein a length of the first communication pipe is different from a length of the second communication pipe. In the intake device for an internal combustion engine according to claim 3 or 4 ,
The intake passage, from the upstream side toward the downstream side made form so as to be inclined downward,
The first volume chamber is formed on one side of the intake passage in plan view,
The second volume chamber overlaps with the intake passage in plan view, and is formed across both sides of the intake passage.
The second communication pipe extends in a direction along the air flow of the intake passage,
An internal combustion engine characterized in that an exhaust port connected to the second volume chamber of the second communication pipe is located above an intake port connected to the intake flow path of the second communication pipe. Inhalation device.

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