JP2010077881A - Installation structure for intake component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To install a silencer 2 to a duct body 1 without using a clamp. <P>SOLUTION: A pair of branch pipes 10 respectively having tips slanting downwards and a pair of attachment pipes 20 having tips slanting downwards are inserted respectively, and the silencer 2 in an external form nearly of a letter U holds the duct body 1 as if hugging the same. Thus, without using clamps, the silencer 2 is prevented from coming off. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a mounting structure for intake parts such as an intake duct to which a silencer such as a resonator or a side branch is attached.

  A silencer such as a resonator or a side branch is attached to an intake duct of an automobile. According to such a silencer, when a relatively low frequency intake noise is silenced, it becomes a large-sized device, which is restricted by the arrangement space in the engine room. Thus, Japanese Utility Model Application No. 64-041664 proposes a sound deadening structure in which a meandering long passage is formed in a sealed housing. Japanese Utility Model Laid-Open No. 04-089848 or Japanese Patent Laid-Open No. 04-262013 proposes an air hose-integrated branch pipe in which a spiral silencer is attached to the outer periphery of an intake duct. By doing so, it is possible to reduce the size of the intake noise at a relatively low frequency.

Further, Japanese Laid-Open Patent Application No. 09-021364 proposes a resonator structure in which another resonator is formed inside the resonator. By doing in this way, it becomes possible to mute the intake noise of a plurality of frequencies with one resonator main body.
Japanese Utility Model Publication No. 64-041664 Japanese Utility Model Publication No. 04-089848 Japanese Unexamined Patent Publication No. 04-262013 Japanese Patent Laid-Open No. 09-021364

  By the way, in order to attach a silencer such as a resonator or side branch to the intake duct, a branch cylinder part is formed in the intake duct, and after inserting the cylinder part and the branch cylinder part communicating with the silencer of the silencer from each other, A method of fastening with a clamp or the like is common. However, due to the recent reduction in fuel consumption due to weight reduction and exhaust gas regulations, mounting without using a clamp is required.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an attachment structure in which a silencer is attached to an intake duct without using a clamp.

The feature of the intake part mounting structure of the present invention that solves the above-described problems is that an intake duct comprising a cylindrical duct body and a plurality of branch portions projecting from the duct body, a pair of legs, and ends of the pair of legs A muffler having a substantially U-shaped or a substantially U-shaped outer shape surrounding the outer periphery of the duct body, and a plurality of mounting portions protruding from the muffler. A mounting structure for an intake part that is assembled to a vehicle in a state where the silencer is coupled to the intake duct by inserting a plurality of branch portions and a plurality of mounting portions into each other,
In the state assembled to the vehicle, the first insertion axis direction of the first attachment portion formed on one leg portion is intersecting at an acute angle with respect to the horizontal plane from the root of the first attachment portion toward the tip. The second insertion axis direction of the second attachment portion formed on the other leg portion is inclined downward and extends in the horizontal direction or intersects the horizontal plane from the root of the second attachment portion to the tip at an acute angle. The first insertion axis direction and the second insertion axis direction intersect with each other when projected in the horizontal direction.

  According to the mounting structure of the present invention, the silencer is attached to the duct main body by at least two mounting portions, and the insertion axis directions of at least two mounting portions intersect with each other and intersect with each other at an acute angle with respect to the horizontal plane. It is inclined to. Therefore, the weight of the silencer is supported by the two attachment portions, and the reaction force vector against the weight of the silencer acts in the direction opposite to the direction in which the attachment portion and the branching portion are pulled out. It is possible to stably attach the silencer in a state in which the silencer is prevented from dropping as unnecessary. Moreover, since a clamp etc. become unnecessary, the man-hour for attaching a silencer can be reduced.

  The mounting structure for an intake part according to the present invention includes an intake duct and a silencer. The intake duct includes a cylindrical duct body and a plurality of branch portions protruding from the duct body. At least two branch portions are formed, but three or more branch portions may be formed. The branch portion may be a cylindrical portion that communicates with the duct body or a solid cylindrical portion, but at least one tubular branch portion that communicates with the duct body is formed.

  The silencer refers to a side branch or a resonator, and includes a silencer having a silencer chamber inside and a plurality of mounting portions protruding from the silencer. The silencer includes a pair of leg portions and a bridge portion that connects ends of the pair of leg portions, and has a substantially U-shaped or substantially U-shaped outer shape surrounding the outer periphery of the duct body. In the state assembled to the vehicle, the bridge portion may be located above the duct body or may be located below. At least two attachment portions are formed, but three or more attachment portions can be formed. The branch portion may be a cylindrical portion or a solid cylindrical portion, and at least one cylindrical attachment portion that communicates with the silencing chamber inside the silencer is formed. The silencer may form a single silencing chamber inside, or may have a plurality of silencing chambers by partitioning the interior with a partition plate.

  The silencer is held in the intake duct by the plurality of branch portions and the plurality of attachment portions being inserted into each other. In the present invention, attachment portions are respectively formed on the pair of leg portions of the silencer, and are inserted through the corresponding branch portions. And in the state assembled | attached to the vehicle, the 1st insertion axial direction of the 1st attaching part formed in one leg part cross | intersects at an acute angle with respect to a horizontal surface toward the front-end | tip from the base of a 1st attaching part. While tilting downward, the second insertion axis direction of the second mounting portion formed on the other leg portion extends in the horizontal direction or intersects the horizontal plane at an acute angle from the root of the second mounting portion toward the tip. However, the first insertion axis direction and the second insertion axis direction intersect each other when projected in the horizontal direction.

  With this configuration, the weight of the silencer is supported at two locations, and the reaction force vector against the weight of the silencer acts in the direction opposite to the direction in which the mounting portion and the branching portion are pulled out. Therefore, the silencer can be stably attached without using the fastening member.

  As in the first insertion axis direction, the second insertion axis direction desirably crosses at an acute angle with respect to the horizontal plane from the root of the second mounting portion toward the tip in the state where the second insertion axis direction is assembled to the vehicle. By doing so, it is possible to more reliably prevent a problem that the silencer falls from the intake duct.

  It is desirable to have an insertion guide portion having an oval shape having an inner diameter larger than the outer diameter of the other tip at the tip of one opening of the branch portion and the attachment portion. By doing in this way, insertion work can be made still easier. Therefore, the angle can be further increased within the above range, and can be further prevented from coming off.

  Hereinafter, the present invention will be described specifically by way of examples.

Example 1
The mounting structure of the intake component according to the present embodiment is shown in FIGS. This mounting structure includes a duct body 1 made of a soft resin such as rubber or thermoplastic elastomer having a pair of branch cylinders 10 and a silencer 2 made of PP resin having a pair of mounting cylinders 20. The silencer 2 has a substantially U-shaped outer shape that includes a pair of leg portions 21 and a bridge portion 22 that connects the end portions of the pair of leg portions 21, and a silencer chamber 23 is formed therein. .

  The pair of branch tube portions 10 communicate with the inside of the duct body 1 and are formed symmetrically with respect to the central axis of the duct body 1. The pair of mounting cylinders 20 communicate with the sound deadening chamber 23 and are formed symmetrically with respect to the central axis of the silencer 2. Then, by inserting the pair of mounting cylinder portions 20 into the pair of branch cylinder portions 10, the silencer 2 is held by the duct body 1, and the silencer chamber 23 is ducted via the attachment cylinder portion 20 and the branch cylinder portion 10. It communicates with the inside of the main body 1. Accordingly, the silencer 2 functions as a volume chamber and the mounting cylinder portion 20 functions as a neck portion, so that a resonator effect is exhibited and noise at a predetermined frequency can be reduced.

  Here, the central axis of the pair of branch tube portions 10 is an acute angle with respect to a horizontal plane (P) (a plane that includes the straight line P and is perpendicular to the paper surface) from the root toward the tip when assembled in the vehicle. Inclining downwards while intersecting. Further, the central axes of the pair of mounting cylinder portions 20 are also inclined downward while intersecting at an acute angle with respect to the horizontal plane (P) from the root toward the tip. The central axes of the pair of branch cylinders 10 intersect at an opening angle of 180 ° or less (for example, 160 °), and the central axes of the pair of mounting cylinders 20 intersect at an opening angle of 180 ° or less (for example, 160 °). ing.

  Therefore, according to the mounting structure of the present embodiment, the amount of protrusion of the silencer 2 can be kept small, which is advantageous in terms of mounting space. The weight of the silencer 2 is supported by the two mounting cylinder parts 20, and the vector of the reaction force against the weight of the silencer 2 acts in the direction opposite to the direction in which the mounting cylinder part 20 and the branch cylinder part 10 are pulled out. For this reason, the silencer 2 is stably held in a state in which it is prevented from falling off without using a fastening member such as a clamp.

  In order to attach the silencer 2 to the duct body 1, as shown in FIG. 2, the silencer 2 is disposed in the space between the pair of legs 21, and at least one of the duct body 1 and the silencer 2 is disposed. Can be attached simply by inserting the pair of attachment tube portions 20 into the pair of branch tube portions 10 while elastically deforming the member, and a fastening member such as a clamp is not necessary, so that the attachment man-hour can be greatly reduced. . Also, as shown in FIG. 4, the silencer 2 is disposed in the duct body 1 in an inclined state and rotated in the direction of the arrow in FIG. 4 to insert the pair of mounting tube portions 20 into the pair of branch tube portions 10 respectively. May be.

  If it is not easy to insert the pair of attachment tube portions 20 into the pair of branch tube portions 10, respectively, the distal end of the branch tube portion 10 is sufficiently larger than the outer diameter of the attachment tube portion 20 as shown in FIG. It is preferable to form the oval part 11 as an insertion guide part having a large inner diameter. The attachment cylinder part 20 can be guided by the oval part 11, and the attachment cylinder part 20 can be easily inserted into the branch cylinder part 10. Moreover, as shown in FIG. 6, it is also preferable to make it the taper shape which made the front-end | tip of the branch cylinder part 10 and the attachment cylinder part 20 slanted. In this way, the mounting tube portion 20 can be easily inserted into the branch tube portion 10 by guiding the tip taper surface of the mounting tube portion 20 with the tip taper surface of the branch tube portion 10.

(Example 2)
As shown in FIG. 7, the mounting structure of the present embodiment is the same as that of the first embodiment except that one of the mounting tube portions 20 is a solid mounting protrusion 24. In the mounting structure of the present embodiment, the noise reduction chamber 23 and the duct main body 1 communicate with each other through only one mounting tube portion 20, and therefore the frequency of noise that can be silenced is different from that of the first embodiment. However, other than that, the same effect as Example 1 is expressed.

(Example 3)
In the mounting structure of this embodiment, as shown in FIG. 8, the silencer 2 has a partition wall 25 inside, and the two silencer chambers 26 are formed by the partition wall 25. The two sound deadening chambers 26 communicate with the inside of the duct body 1 through the attachment cylinder part 20 and the branch cylinder part 10, respectively. In the mounting structure of the present embodiment, the frequency of noise that can be silenced is different from that of the first embodiment. However, other than that, the same effect as Example 1 is expressed.

Example 4
As shown in FIG. 9, in the mounting structure of the present embodiment, in the state assembled to the vehicle, the central axis directions of one branch cylinder portion 10 ′ and one attachment cylinder portion 20 ′ are respectively the horizontal plane (P). It is the same as that of Example 1 except being parallel. The central axes of the branch cylinder part 10 and the branch cylinder part 10 'intersect at an opening angle of 180 ° or less (for example, 170 °), and the central axes of the mounting cylinder part 20 and the mounting cylinder part 20 ′ also have an opening angle of 180 ° or less ( For example, it intersects at 170 °.

  According to the mounting structure of the present embodiment, the mounting operation is slightly easier than the mounting structure of the first embodiment.

(Example 5)
As shown in FIG. 10, the mounting structure of the present embodiment has a configuration in which a silencer 3 having a substantially inverted U-shaped outer shape is positioned above the duct body 1 when assembled to a vehicle. The same as in the first embodiment. The duct body 1 is the same as that of the first embodiment.

  In the mounting structure of the present embodiment, in the state assembled to the vehicle, the central axis of the pair of mounting cylinder portions 30 is inclined downward while intersecting at an acute angle with respect to the horizontal plane (P) from the root toward the tip. Yes. The central axes of the pair of mounting cylinder portions 30 intersect at an opening angle of 180 ° or less (for example, 160 °). Therefore, according to the mounting structure of the present embodiment, the reaction force vector against the weight of the silencer 3 acts in the direction opposite to the direction in which the mounting tube portion 30 and the branch tube portion 10 are pulled out. Even if it is not used, the silencer 3 is stably held in a state in which the silencer 3 is prevented from falling off.

(Example 6)
In the mounting structure of this embodiment, as shown in FIG. 11, the pair of branch tube portions 10 are formed at positions shifted in the length direction of the duct body 1, and the pair of mounting tube portions 20 are also a pair of branch tube portions 10. It is the same as that of Example 1 except that it forms in the position shifted corresponding to.

  The center axes of the pair of branch cylinder portions 10 are inclined downward while intersecting at an acute angle with respect to a horizontal plane (a plane parallel to the paper surface) from the root toward the tip when assembled in the vehicle. Further, the central axes of the pair of mounting cylinder portions 20 are also inclined downward while intersecting at an acute angle with respect to the horizontal plane from the base toward the tip. The central axes of the pair of branch cylinders 10 intersect at an opening angle of 180 ° or less (for example, 160 °) when projected in the horizontal direction, and the central axes of the pair of mounting cylinders 20 are also projected in the horizontal direction. Sometimes they cross at an opening angle of 180 ° or less (eg 160 °).

  Also in the mounting structure of the present embodiment, the same effects as those of the first embodiment are exhibited.

It is a perspective view which shows the attachment structure of the intake component which concerns on one Example of this invention. It is a disassembled perspective view of the attachment structure of the intake component which concerns on one Example of this invention. It is sectional drawing of the intake component which concerns on one Example of this invention. It is explanatory drawing which shows the attachment method of the intake component which concerns on one Example of this invention. It is a principal part expanded sectional view which shows the other aspect of the attachment structure of the intake component which concerns on one Example of this invention. It is a principal part expanded sectional view which shows the other aspect of the attachment structure of the intake component which concerns on one Example of this invention. It is sectional drawing of the intake component which concerns on the 2nd Example of this invention. It is sectional drawing of the intake component which concerns on the 3rd Example of this invention. It is sectional drawing of the intake component which concerns on the 4th Example of this invention. It is sectional drawing of the intake component which concerns on the 5th Example of this invention. It is sectional drawing of the intake component which concerns on the 6th Example of this invention.

Explanation of symbols

1: Duct body 2: Silencer
10: Branch cylinder 20: Mounting cylinder
21: Leg 22: Bridge

Claims (3)

An intake duct comprising a cylindrical duct body and a plurality of branch portions projecting from the duct body;
A muffler comprising a pair of leg portions and a bridge portion connecting the ends of the pair of leg portions and having a substantially U-shaped or substantially U-shaped outer shape surrounding the outer periphery of the duct body and having a sound deadening chamber inside. And a silencer comprising a plurality of mounting portions protruding from the silencer,
A mounting structure for an intake part that is assembled to a vehicle in a state where the silencer is coupled to the intake duct by inserting the plurality of branch portions and the plurality of mounting portions into each other,
In the state assembled to the vehicle, the first insertion axis direction of the first attachment portion formed on one of the leg portions is at an acute angle with respect to the horizontal plane from the root of the first attachment portion toward the tip. The second insertion axis direction of the second attachment part formed on the other leg part is inclined downward while intersecting, and extends in the horizontal direction or in a horizontal plane from the root of the second attachment part to the tip. A structure for mounting an intake part, wherein the first insertion axis direction and the second insertion axis direction intersect each other when projected in a horizontal direction while intersecting at an acute angle.   2. The intake component mounting structure according to claim 1, wherein the second insertion shaft direction intersects at an acute angle with respect to a horizontal plane from the base of the second mounting portion toward the tip in a state where the second insertion shaft is assembled to the vehicle. .   The attachment of the intake component according to any one of claims 1 to 3, wherein an insertion guide portion having an oval shape having an inner diameter larger than an outer diameter of the other tip is provided at one opening tip of the branch portion and the attachment portion. Construction.

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