JP2010019172A - Intake member - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an intake member which is not bulky, which can suppress the sounds of a suppressed object, and which can be inexpensively manufactured. <P>SOLUTION: A muffling chamber is provided at a mounting end 2 of the intake member having a pathway body 1 and the mounting end 2. The muffling chamber is formed as a side-branch muffling chamber 4, or the pathway body 1 and the mounting end 2 are integrally blow-molded. When the muffling chamber is provided at the mounting end 2, the outside shape of the intake member is smaller than when the mounting end 2 and the muffling chamber are provided separately. When the muffling chamber is formed as the side-branch muffling chamber 4, the mounting end 2 can be simply shaped to reduce the manufacturing cost of the intake member. When the pathway body 1 and the mounting end 2 is integrally blow-molded, the mounting end 2 in a hollow shape can be easily molded to reduce the manufacturing cost of the intake member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an intake member that constitutes a part of an intake path of an internal combustion engine.

  The intake device is a device for supplying air to the internal combustion engine, and constitutes an intake path of the internal combustion engine. Such an intake device is connected to various intake members such as an intake duct, an air cleaner, an air cleaner hose, a throttle body, and an intake manifold, and is disposed in an engine room.

  Incidentally, noise generated in the internal combustion engine and noise generated when air flows through the intake device propagate to the intake member. In order to suppress this noise, a technique of providing a silencer on the intake member has been proposed (see, for example, Patent Document 1). FIG. 6 is a perspective view schematically showing an example of a conventional intake member. Hereinafter, a conventional intake member will be described with reference to FIG.

  As shown in FIG. 6, the intake member has a path main body 100, a mounting end 200, and a silencer 400. The path main body 100 has a cylindrical shape having a part of the intake path (referred to as a path portion) inside. The mounting end 200 and the silencer 400 are integrated with the path main body 100 and project outside the path main body 100. The attachment end 200 is provided with an attachment portion 250 attached to another member (not shown). The intake member is fixed to the engine room by attaching the mounting portion 250 to another member disposed in the engine room (not shown).

  As the silencer 400 for the intake member, a Helmholtz type silencer 401 (so-called resonator, hereinafter referred to as a resonator) and a side branch type silencer 402 (so-called side branch, hereinafter referred to as a side branch) are generally used. The silencer 400 has a silencer chamber that communicates with the route section. That is, the silencer has a hollow shape.

  The shapes of the resonator 401 and the side branch 402 are designed according to the frequency of noise to be suppressed (hereinafter referred to as suppression target sound). For this reason, these silencers 400 are comparatively large, and the intake member having the silencer 400 is bulky. Incidentally, various other members are arranged in the engine room in addition to the intake member. For this reason, the empty space in an engine room is very small. Therefore, an air intake member that is not bulky is desired. However, since the shape of the silencer 400 is designed according to the frequency of the suppression target sound as described above, there is a possibility that the suppression target sound cannot be suppressed by simply downsizing the silencer 400.

  In addition, since the intake member having the silencer 400 has a very complicated three-dimensional shape and is difficult to be integrally formed, there is a problem that it cannot be manufactured at low cost.

For this reason, the development of an intake member that is not bulky, can suppress the sound to be suppressed, and can be manufactured at low cost is desired.
Japanese Patent Publication No. 8-90641

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an intake member that is not bulky, can suppress the sound to be suppressed, and can be manufactured at low cost.

  A first intake member of the present invention that solves the above-described problems is formed by integrating a cylindrical path body 1 having a path portion 10 that constitutes a part of an intake path of an internal combustion engine, and the path body 1. A mounting end 2 that protrudes to the outside of the path main body 1, and the mounting end 2 has a mounting portion 25 that is attached to another member, and a side branch type sound deadening chamber 4 that communicates with the path portion 10. It is characterized by.

  The first intake member preferably includes at least one of the following (1) to (2).

  (1) The path body 1 and the attachment end 2 are integrally blow-molded.

  (2) The side branch type silencing chamber 4 extends while being bent or bent, and the entire length of the side branch type silencing chamber 4 is longer than the length of the mounting end 2 in the longitudinal direction.

  A second intake member of the present invention that solves the above-described problems includes a cylindrical path body 1 having a path portion 10 that constitutes a part of an intake path of an internal combustion engine, and blow molding integrally with the path body 1. And a mounting end 2 projecting to the outside of the path main body 1, and the mounting end 2 has a mounting portion 25 attached to another member and a silencer chamber communicating with the path portion 10. Features.

  The second intake member preferably includes at least one of the following (3) to (4).

  (3) The silencing chamber is a side branch type silencing chamber 4.

  (4) The side branch type silencing chamber 4 extends while being curved or bent, and the entire length of the side branch type silencing chamber 4 is longer than the length of the mounting end 2 in the longitudinal direction.

  The first intake member of the present invention has a path body and an attachment end. The path main body has a path portion that is a part of the intake path, and the attachment end has an attachment portion attached to another member. The mounting end has a side branch type sound deadening chamber in addition to the mounting portion. Therefore, the attachment end of the first intake member also has a function as a side branch. By providing the attachment end with a function as a side branch, the outer shape of the entire intake member can be reduced as compared with the case where the silencer and the attachment end are provided separately. That is, the first intake member is not bulky. In addition, since the attachment end has a hollow shape having a side branch type sound deadening chamber, there is an advantage that the attachment end has a larger section modulus and the strength of the attachment end is improved.

  By the way, the noise frequency that can be suppressed by the resonator is related to the volume of the muffler chamber. Therefore, the resonator requires a relatively large silencer chamber (so-called volume chamber), and the resonator has a relatively large external shape. Since the size of the mounting end is determined according to the relative position between the other member to which the path main body is to be mounted and the path main body and the size of the empty space in the engine room, it is difficult to provide a large silencing chamber at the mounting end. There is a case. On the other hand, the length of the noise reduction chamber is related to the frequency of noise that can be suppressed by the side branch, but the volume of the noise reduction chamber is not related. Moreover, since the neck part in a resonator is unnecessary for a side branch, the freedom degree of a shape is large compared with a resonator. For this reason, the side branch is easy to achieve both size reduction and suppression of the suppression target sound as compared with the resonator. Therefore, the first intake member provided with the side branch type silencing chamber (that is, the silencing chamber of the side branch) at the attachment end is not bulky and can suppress the suppression target sound.

  Further, the side branch type silencing chamber has a relatively simple shape. For this reason, the first intake member having the side branch type silencing chamber also has a relatively simple shape and can be manufactured at low cost.

  The first intake member having the above (1) can be manufactured at a lower cost. This is because, according to the blow molding method, the path main body and the attachment end can be easily integrally formed, so that the manufacturing cost of the intake member can be reduced.

  The first intake member provided with the above (2) is not bulky and can suppress the low-frequency suppression target sound. This is due to the following reason.

The resonance frequency f ₀ of the side branch can be calculated based on the following formula 1. If ask the f ₀ is equal or close to the frequency of the suppression target sound can be suppressed suppression target sound.
(Formula 1)
f ₀ = c / 4 (l + Δl)
Here, c is the speed of sound, l is the total length of the side branch type silencing chamber (that is, the tube length of the side branch), and Δl is the correction length of the side branch type silencing chamber depending on the opening end area and the boundary around the opening. .

  According to Formula 1, it is necessary to lengthen the full length of the side branch type silencing chamber as the suppression target sound has a lower frequency, and the side branch type silencing chamber becomes larger. In the first air intake member and the second air intake member, the sound deadening chamber (side branch type sound deadening chamber) is provided at the attachment end, so that the shape of the sound deadening chamber is easily affected by the shape of the attachment end. However, by extending the side branch type silencing chamber so that it is curved or bent, the entire length of the side branch type silencing chamber can be made longer than the length of the mounting end in the longitudinal direction, and the side branch type silencing chamber can suppress low frequencies. The target sound can be suppressed.

  The attachment end in the second intake member of the present invention also has a function as a silencer, like the attachment end in the first intake member. For this reason, the second intake member is also not bulky. Furthermore, since the silencer chamber is provided at the attachment end, the silencer chamber can be enlarged as compared with the case where the attachment end and the silencer are provided separately. Therefore, for example, even when a resonator volume chamber is selected as the muffler chamber, it is easy to suppress the suppression target sound. Therefore, the second intake member is also not bulky and can suppress the suppression target sound.

  Furthermore, the path main body and the attachment end of the second intake member are integrally blow-molded. For this reason, the second intake member can be manufactured at low cost.

  The second intake member provided with the above (3) is less bulky and can suppress the suppression target sound, like the first intake member described above.

  The second intake member including the above (4) is not bulky and can suppress the low-frequency suppression target sound, similarly to the above-described first intake member including the above (2).

  Hereinafter, the intake member of the present invention will be described with specific examples.

Example 1
The intake member of the first embodiment is a first intake member including the above (1) and a second intake member including the above (3). FIG. 1 is a perspective view schematically showing the intake member of the first embodiment. FIG. 2 is a cross-sectional view schematically showing a state where the intake member of the first embodiment is cut along a plane passing through the axis of the path body. FIG. 3 is a cross-sectional view schematically showing a state where the intake member of Example 1 is cut at the position AA in FIG.

  The intake member according to the first embodiment is an intake duct, and has a path body 1, an attachment end 2, two sub attachment ends 3, and a resonator attachment portion 5, as shown in FIG.

  The intake member of Example 1 is formed by a blow molding method. Therefore, the path body 1, the mounting end 2, the two sub mounting ends 3, and the resonator mounting portion 5 are integrally blow-molded. Further, the attachment end 2, the two sub attachment ends 3, and the resonator attachment portion 5 protrude outside the path body 1.

  The path body 1 has a curved cylindrical shape. One end of the path main body 1 in the longitudinal direction (in the direction of the axis L1 shown in FIG. 2) constitutes an intake 15 that serves as an air intake. The intake portion 15 is disposed at a front portion in an unillustrated engine room. The other end in the longitudinal direction of the path body 1 constitutes an air cleaner attaching portion 16 attached to an air cleaner case (not shown). A path portion 10 inside the path body 1 constitutes a part of the intake path of the internal combustion engine. The wall thickness of the peripheral wall 12 of the path body 1 is about 2.5 mm.

  The attachment end 2 is provided in the in-course portion of the path main body 1. The in-course portion here refers to a portion corresponding to the side having a smaller radius of curvature in a cross section obtained by cutting the path body 1 along a plane passing through the axis L1. A side branch type sound deadening chamber 4 extending in the longitudinal direction (protruding direction) of the attachment end 2 is provided at a substantially central portion of the attachment end 2. The peripheral edge 20 of the mounting end 2 has a solid plate shape. Therefore, as shown in FIG. 3, the attachment end 2 has a hollow shape. As shown in FIG. 2, the base end portion 40 of the side branch type sound deadening chamber 4 is located on the path main body 1 side and communicates with the path portion 10. The distal end portion 41 of the side branch type silencing chamber 4 is closed and is located on the opposite side of the path main body 1 (the protruding end side of the mounting end 2). The side branch type silencing chamber 4 in the intake member of the first embodiment extends linearly. The length of the attachment end 2 in the longitudinal direction is 140 mm, and the total length of the side branch type silencing chamber 4 is 79.5 mm. The wall thickness of the peripheral edge 20 of the mounting end 2 is about 2.5 mm. A peripheral portion 20 of the attachment end 2 is provided with an attachment portion 25 having a through hole shape. The attachment portion 25 is screwed to a body sheet metal (not shown) which is another member.

  The two sub attachment ends 3 have a substantially plate shape. As shown in FIG. 1, the first sub attachment end 31, which is one of the sub attachment ends 3, is disposed in the vicinity of the intake portion 15. The first sub attachment end 31 is provided with a first sub attachment portion 35 having a through hole shape. The first sub-mounting portion 35 is screwed to a body sheet metal (not shown) which is another member. The second sub mounting end 32, which is the other sub mounting end 3, is arranged closer to the air cleaner mounting portion 16 than the mounting end 2. The second sub attachment end 32 is provided with a second sub attachment portion 36 having a through hole shape. The second sub attachment portion 36 is screwed to a body sheet metal (not shown) which is another member.

  The resonator attachment portion 5 is disposed closer to the air cleaner attachment portion 16 than the second sub attachment end 32. The resonator mounting portion 5 is a portion that is mounted on a not-shown resonator and has a cylindrical shape. The inside of the resonator mounting portion 5 communicates with the route portion 10 of the route body 1.

  As shown in FIG. 2, in the intake member of the first embodiment, the air that has flowed into the path portion 10 through the intake portion 15 circulates in the path portion 10 and passes through the air cleaner mounting portion 16 to an air cleaner case (not shown). Flow into. At this time, noise generated by the internal combustion engine, noise generated by the air flowing through the intake path, and the like propagate to the path unit 10. However, the noise propagated to the path portion 10 propagates to the side branch type silencing chamber 4 through the base end portion 40. For this reason, the suppression target sound component (specifically, noise having a frequency of 740 Hz) is suppressed by the resonance effect of the side branch type silencing chamber 4 among the noise propagated to the side branch type silencing chamber 4. Therefore, according to the intake member of the first embodiment, the suppression target sound can be suppressed.

  Further, by providing the side branch type silencing chamber 4 at the attachment end 2, the outer shape of the intake member can be made smaller than when the attachment end 2 and the side branch are separately provided at the intake member. Therefore, the intake member of Example 1 is not bulky.

  Further, the intake member of the first embodiment is blow molded. For this reason, the intake member of the first embodiment has a complicated shape having the attachment end 2 having the side branch type silencing chamber 4, the first sub attachment end 31, the second sub attachment end 32, and the resonator attachment portion 5. Nevertheless, it can be easily formed integrally. Therefore, the intake member of the first embodiment can be manufactured at a low cost.

  The attachment end 2 has a hollow shape having a side branch type sound deadening chamber 4. For this reason, the section modulus of the mounting end 2 is large. Therefore, the attachment end 2 in the intake member of Example 1 is excellent in strength.

  By the way, the peripheral edge portion 20, the first auxiliary attachment end 31, and the second auxiliary attachment end 32 of the attachment end 2 in the intake member of the first embodiment are formed by crushing during blow molding. For this reason, the thickness of the peripheral edge portion 20 of the mounting end 2, the first sub mounting end 31, and the second sub mounting end 32 is thicker than the thickness of other portions (for example, the peripheral wall 12 of the path body 1). It is meat. For this reason, although the intake member of Example 1 is blow-molded, the strength of the attachment end 2 is excellent.

(Example 2)
The intake member of the second embodiment is a first intake member including the above (1) to (2) and a second intake member including the above (3) to (4). The intake member of the second embodiment is the same as the intake member of the first embodiment except for the shape of the attachment end. FIG. 4 is a perspective view schematically showing the intake member of the second embodiment. FIG. 5 is a cross-sectional view schematically showing a state where the intake member of the second embodiment is cut along a plane passing through the axis of the path main body.

  As shown in FIG. 4, the attachment end 2 of the intake member of the second embodiment is provided in the in-course portion of the path body 1, similarly to the attachment end of the intake member of the first embodiment. A side branch type sound deadening chamber 4 is provided at a substantially central portion of the mounting end 2. The side branch type silencing chamber 4 in the intake member of the second embodiment has a substantially J-shaped bent shape. Specifically, as shown in FIG. 5, the base end portion 40 of the side branch type sound deadening chamber 4 is located on the route main body 1 side and communicates with the route portion 10. The front end portion 41 of the side branch type silencing chamber 4 is closed and is located on the path main body 1 side. The substantially central portion of the side branch type silencing chamber 4 is located on the protruding end side of the mounting end 2. The length of the mounting end 2 in the longitudinal direction is 140 mm, and the total length of the side branch type silencing chamber 4 is 132 mm. Therefore, the overall length of the side branch type silencing chamber 4 in the intake member of the second embodiment is longer than the length of the attachment end 2 in the longitudinal direction.

  In the intake member of the second embodiment, as in the intake member of the first embodiment, the side branch type silencer chamber 4 is provided at the attachment end 2, and the attachment end 2 and the path body 1 are integrally blow-molded. For this reason, the intake member of Example 2 is not bulky like the intake member of Example 1, is excellent in the strength of the attachment end 2, and is manufactured at low cost.

  The side branch type silencing chamber 4 in the intake member of the second embodiment is bent. However, as described above, the length of the muffler chamber is only related to the frequency of the noise that can be suppressed by the side branch type muffler chamber 4. For this reason, the intake member of Example 2 can also sufficiently suppress the suppression target sound. Further, the overall length of the side branch type silencing chamber 4 in the intake member of the second embodiment is as long as 132 mm. For this reason, according to the side branch type silencing chamber 4 in the intake member of the second embodiment, it is possible to suppress the suppression target sound at a low frequency (530 Hz).

  Further, according to the intake member of the second embodiment, the side branch type sound deadening chamber 4 is bent so that the length of the side branch type sound deadening chamber 4 is increased without increasing the length of the mounting end 2 in the longitudinal direction. it can. For this reason, the low frequency suppression target sound can be suppressed and the intake member can be prevented from being bulky.

  Note that the intake member of the present invention may have a plurality of attachment ends having a sound deadening chamber. Further, the intake member of the present invention may be provided with a plurality of sound deadening chambers at one mounting end. In these cases, the silencing chambers can be arranged at a plurality of locations on the route main body, and a plurality of silencing chambers having different lengths can be provided, so that there is an advantage that a plurality of suppression target sounds having different frequencies can be suppressed.

  In the intake member of the present invention, the position of the attachment end with respect to the path body can be appropriately set in consideration of the relative position between the counterpart member and the intake member, the empty space in the engine room, etc., but the path body has a curved or bent shape. In this case, the attachment end is preferably provided in the in-course portion of the path body. In this case, since the length of the mounting end in the longitudinal direction can be increased without increasing the outer shape of the intake member, there is an advantage that the entire length of the side branch type sound deadening chamber can be increased.

  The intake members of the first and second embodiments include a resonator separately from the side branch (that is, the side branch type silencer chamber 4 of the attachment end 2). However, the intake member of the present invention is a silencer chamber provided at the attachment end. You may have only.

FIG. 3 is a perspective view schematically illustrating an intake member according to the first embodiment. It is sectional drawing which represents typically a mode that the air intake member of Example 1 was cut | disconnected by the plane which passes along the axis line of a path | route main body. FIG. 2 is a cross-sectional view schematically illustrating a state in which the intake member of Example 1 is cut at a position AA in FIG. 1. FIG. 6 is a perspective view schematically illustrating an intake member of Embodiment 2. It is sectional drawing which represents typically a mode that the air intake member of Example 2 was cut | disconnected by the plane which passes along the axis line of a path | route part. It is a perspective view showing typically an example of the conventional intake member.

Explanation of symbols

1: Path body 2: Mounting end 4: Side branch type muffler 10: Path section 25: Mounting section

Claims (6)

A cylindrical path main body having a path portion constituting a part of an intake path of the internal combustion engine, and an attachment end that is integrated with the path main body and protrudes to the outside of the path main body;
The air intake member, wherein the attachment end has an attachment portion attached to another member, and a side branch type silencing chamber connected to the path portion.   The intake member according to claim 1, wherein the path main body and the attachment end are integrally blow-molded.   The air intake member according to claim 1 or 2, wherein the side branch type silencing chamber extends while being bent or bent, and the entire length of the side branch type silencing chamber is longer than a length in a longitudinal direction of the attachment end. A cylindrical path main body having a path portion constituting a part of an intake path of the internal combustion engine, and a mounting end which is blow-molded integrally with the path main body and protrudes to the outside of the path main body,
The air intake member, wherein the attachment end has an attachment portion attached to another member and a silencer chamber communicating with the path portion.   The intake member according to claim 4, wherein the silencer is a side branch type silencer.   The intake member according to claim 5, wherein the side branch type silencing chamber extends while being bent or bent, and an overall length of the side branch type silencing chamber is longer than a length in a longitudinal direction of the attachment end.

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