JP5091741B2 - Silencer duct - Google Patents

Description

The present invention relates to a ventilation duct through which a gas such as air flows. In particular, the present invention relates to a silencer duct in which a part of the ventilation duct is constituted by a so-called porous duct in which a breathable material is formed in a cylindrical shape.

Such a muffler duct is used as a part of an intake system of an internal combustion engine of an automobile and is used as an engine intake passage, or cools a secondary battery (storage battery) provided in a fuel cell vehicle or an electric vehicle. It is used in a cooling air blowing system for the purpose, or is used in a part of a ventilation path of an air conditioning system. In these silencer ducts, the duct wall surface is made breathable by a porous duct formed by a breathable material such as a nonwoven fabric having moderate breathability, a continuous foam structure resin foam or a woven fabric. Noise reduction is attempted by preventing the occurrence of air column resonance occurring in the duct system or by absorbing the acoustic energy of noise propagating through the duct by the porous structure of the porous duct.

As such a silencer duct, in Patent Document 1, a fiber duct having water repellency is used as a porous duct, and a synthetic resin resin duct member is connected to both ends of the porous duct, and the resin duct member is connected to the vehicle body. A silencer duct with a mounting bracket is described.
JP 2006-90250 A

However, in the conventionally known silencer duct as shown in Patent Document 1, a structure in which resin ducts, which are independent members, are connected to both ends of a porous duct made of a relatively flexible material with respect to the resin duct portion. Therefore, the entire silencer duct was softer than the duct made of resin, and its shape was difficult to determine.
Therefore, in order to allow the muffler duct to pass through a predetermined path in a limited space such as an engine room of a vehicle, the resin ducts at both ends of the porous duct are independently fixed at a predetermined position / posture. In addition to the tendency to increase the size and complexity of mounting members on the vehicle body, etc., the number of assembly steps to the vehicle body has increased. Therefore, it has been desired to provide a muffler duct that can be easily installed in a smaller space.

In addition, since it is difficult to provide a mounting member for a vehicle body or the like in a relatively flexible porous duct portion, in the conventional silencer duct, the setting position of the mounting member is limited to the periphery of the resin duct. Therefore, the improvement was also desired.

An object of the present invention is to provide a silencer duct that uses a porous duct to improve the shape retention of the entire silencer duct and to simplify the mounting structure to a vehicle body or the like.

As a result of intensive studies, the inventor has found that the above-mentioned problems can be solved by connecting and integrating the resin duct members connected to both sides of the porous duct to complete the present invention.

The present invention is a silencer duct in which a pair of resin ducts are connected to both ends of a porous duct formed in a cylindrical shape by a breathable material, and a series of ventilation paths are formed between the resin ducts. , organic pair of resin duct, Rutotomoni are integrally connected by resin linking member, wherein are integrally molded with the pair of resin ducts and the resin connecting member, the resin connecting member a hollow portion A porous duct is provided outside the hollow portion of the resin connecting member, and the porous duct is exposed to the outside .

In the present invention, the connecting member may be provided with an attachment portion (Claim 2 ), and the connecting member is formed as a pipe-shaped member having a hollow portion communicating with the internal space of both of the pair of resin ducts. A sub-ventilating path connecting between the ducts may be formed (Claim 3 ), and the coupling member is used as a member having a hollow portion communicating with at least one internal space of the pair of resin ducts. A silencer may be configured (claim 4 ). Also, it may be provided with a guide portion for supporting the middle portion of the porous ducts connecting member (claim 5).

Further, the present invention is a resin member connected to a porous duct formed in a cylindrical shape by a breathable material, the pair of duct members connected to both ends of the porous duct, and the pair of duct members A connecting member that connects and maintains the position and posture of each other is integrally formed , the connecting member has a hollow portion, and the duct member is a porous duct so that a porous duct is provided outside the connecting member hollow portion. The connection part connected to is a resin member characterized by being provided outside the hollow part of the connecting member (claim 6 ).

ADVANTAGE OF THE INVENTION According to this invention, in the muffler duct using a porous duct, the shape retention property of the whole muffler duct can be improved, and the effect that the attachment structure to a vehicle body etc. can be simplified is acquired.

Moreover, in this invention, since a pair of resin duct and resin connection member are integrally molded , a noise reduction duct can be manufactured efficiently and there exists an economical advantage. Furthermore, when the configuration according to claims 2 to 5 is adopted as a preferred mode of the present invention, the following effects can be obtained. That is , when the attachment portion is provided on the connecting member (Claim 2 ), the degree of freedom in selecting the position where the attachment member is arranged can be improved. Moreover, when the sub ventilation path which connects between the said resin-made ducts is formed with a connection member (Claim 3 ), the ventilation resistance of the whole silencer duct can be reduced. Moreover, when a resonance type silencer is comprised by the connection member (Claim 4 ), it can be set as the silencer duct which gave the high noise reduction effect in the specific frequency area | region. Further, when the guide member for supporting the intermediate portion of the porous duct is provided on the connecting member (Claim 5 ), it is possible to prevent the porous duct from interfering with surrounding parts or the like and swinging due to vibration.

In addition, according to the resin member of claim 6 , it is possible to obtain a silencer duct having a high shape retaining property of the entire silencer duct and a simplified mounting structure to a vehicle body or the like simply by assembling the resin member and the porous duct. it can.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings, taking a silencer duct used for an intake system of an automobile internal combustion engine as an example. FIG. 1 is a view showing a muffler duct according to a first embodiment of the present invention. A muffler duct 1 has a porous duct 2 having a substantially S-shaped curved shape as shown in the figure, and a connecting member 3 made of synthetic resin. And a series of ventilation channels are formed in the interior. The silencer duct 1 is used in the intake system of an engine as one of the intake system components that form a series of intake paths, connected to other ducts, air cleaners, and the like.

The porous duct 2 is a duct member formed in a hollow shape from a material having air permeability. In the present embodiment, a porous duct is used in which a nonwoven fabric duct formed by spirally winding a tape-shaped nonwoven fabric material is impregnated with a binder resin to adjust its air permeability.
Examples of the breathable material include a synthetic resin foam and a woven fabric material having an open cell structure in addition to the nonwoven fabric material. As for the method of forming a porous duct, a tape-like breathable material is spirally integrated into a duct, or a non-woven material is compressed to form a half-cracked member of the duct, and these are integrated. It is possible to use a known method such as a method of forming a duct into a duct or a method of manufacturing a resin foam having an open cell structure by cutting it into a cylindrical shape. Also, the porous shape can be given in advance to the porous duct 2 by impregnating it with a resin binder.

FIG. 2 is a view showing the structure of the connecting member 3. The connecting member 3 is a member manufactured by blow molding a synthetic resin material (polypropylene resin in the present embodiment). The connecting member 3 includes a pair of duct portions 31 and 32 connected to both ends of the porous duct 2, and It comprises a connecting portion 33 that connects and integrates the duct portions, and mounting portions 34 and 35.
The duct portions 31 and 32 are substantially cylindrical portions formed so that the inside thereof becomes a ventilation flow path, and one end sides (connection portions) 31 a and 32 a thereof are internally connected to both end portions of the porous duct 2. Is done. The duct connecting portions 31a and 32a are provided with protrusions that define and limit the amount of insertion into the porous duct 2 around the duct. The connecting portion between the porous duct 2 and the duct portions 31 and 32 is connected and fixed by, for example, an adhesive material.

The other end 31b of the upstream duct portion 31 is formed in a funnel shape so as to form an intake opening of a series of intake passages, and the other end 32b of the downstream duct portion 32 is the other end that continues downstream. It is provided in a connection shape for connecting to a duct (not shown).

A hollow pipe-like connecting portion 33 is formed integrally with the duct portions 31 and 32 so as to fix the duct portions 31 and 32 in a predetermined relative position and posture. The path of the connecting portion 33 is determined so as to be provided along the outer periphery of the path of the assembled shape of the porous duct 2. The internal space of the pipe-shaped connecting portion 33 is provided so as to communicate with the internal spaces of the duct portions 31 and 32, and as a result, the muffler duct 1 has a main flow path that uses the internal space of the porous duct 2 as a ventilation flow path. In addition, a sub-flow channel having the inside of the connecting portion 33 as a ventilation flow channel is provided.

The duct portion 31 is formed with an attachment portion 34 having a shape in which a columnar protrusion protrudes from a portion where the duct wall is formed in a pedestal shape. Further, a plate-like attachment portion 35 protruding from the wall of the connection portion is formed in the middle of the connection portion 33. These attachment portions are for attaching to the vehicle body side member via a rubber grommet member (not shown), and the shape thereof is determined in accordance with the grommet and the attachment structure.

The connecting member 3 shown in FIG. 2 is manufactured by the following method. First, the precursor of the connection member 3 is integrally formed by a so-called burr biting blow molding method, and excess burrs are removed to obtain a precursor 3 'having a shape as shown in FIG. If the mounting portions 34 and 35 are positioned on the parting surface of the blow-molding die, the molding becomes easier. In the precursor 3 ', the portions 31A and 32A corresponding to the duct portions 31 and 32 are formed into a hollow capsule shape having discarded bag portions 31α, 31β, 32α and 32β closed at both ends thereof. After the precursor 3 'is formed by blow molding, the discarded bag portions 31α, 31β, 32α, and 32β are cut along the pp line, qq line, rr line, and s line by a cutting machine. The connection member 3 can be obtained by cutting.

The porous duct 2 is attached to the connecting member 3 by using the flexibility of the porous duct 2 so that the porous duct 2 is externally fitted to the connecting portions 31a and 32a of the duct portion so that the porous duct 2 passes through a predetermined path. And by fixing the fitting portion. The fitting portion may be fixed by means of adhesive, double-sided tape, mechanical engagement such as ridges and nails, staples, rivets, bands, or the like, in addition to the above-mentioned adhesive.

According to the present embodiment, since the duct portions 31 and 32 are integrally connected by the connecting portion 33, even if the porous duct 2 having high flexibility is used, the completed silencer duct 1 is The duct portions 31 and 32 at both ends become ducts whose positions and postures are fixed to each other, and can be handled and attached like a normal synthetic resin duct. Therefore, even if the structure for attaching the silencer duct 1 to the vehicle body or the like is simplified, the silencer duct 1 can be firmly fixed. Therefore, it is possible to efficiently install the silencing duct, reduce the number of assembling steps to the vehicle body, save space, and provide an economical silencing duct.

Moreover, in this Embodiment, since the connection part 33 forms a subchannel, the ventilation resistance of the muffler duct 1 can be reduced.

Furthermore, according to the present embodiment, since the attachment portion 35 is integrally provided in the middle portion of the connecting portion 33, the degree of freedom of arrangement of the attachment portion 35 can be greatly increased. That is, the porous duct 2 portion cannot be integrally mounted with the synthetic resin mounting portion 35 because the duct is made of a special material such as a breathable material. As a result, in the conventional duct, The portion where the attachment portion 35 is provided is limited to the vicinity of the duct made of synthetic resin. However, in the present invention, the attachment portion can be formed integrally with the connecting portion 33 provided along the porous duct 2, and the degree of freedom of arrangement of the attachment portion 35 is high.

4 and 5 show the second and third embodiments of the present invention. In the following description, parts different from those of the first embodiment will be mainly described, and description of similar parts will be omitted.

In the second embodiment shown in FIG. 4, the connecting member 4 has two connecting portions 43 and 44 provided alongside the porous duct 2. The first connecting portion 43 has a pipe-shaped hollow cross section, and has a crushing portion 431 whose hollow portion is closed like a plate at a substantially central portion thereof. The internal space of the connecting portion 43 is an upstream duct portion. 41 is divided into a portion communicating with the internal space 41 and a portion communicating with the internal space of the downstream duct portion 42, and the upstream portion 433 and the downstream portion 432 of the connecting portion 43 are each a kind of resonant silencer. It constitutes a side branch.

The second connecting portion 44 includes a first portion 441 having a relatively narrow cross section of the hollow portion, a second portion 442 having a relatively large cross section of the hollow portion, and a solid plate-like mounting portion 445, and the first portion 441. Are integrally provided in the downstream duct portion 42 and the attachment portion 445 is integrally provided in the upstream duct portion 41. The internal space of the first portion 441 and the second portion 442 of the connecting portion 44 is a bag-shaped space that communicates with the internal space of the downstream duct 42, and the resonance portion of the resonance silencer is formed by the first portion and the second portion. A kind of Helmholtz resonator is configured.

As shown in the second embodiment, a resonance silencer may be configured by the connecting portion. In that case, a large silencing effect can be obtained in the vicinity of the resonance frequency of the resonance silencer. The resonant silencer can be integrated into the silencer duct in a space-saving manner.
Further, as shown in the present embodiment, a part of the connecting portion (44) may be used as the attaching portion (445).

FIG. 5 shows a perspective view of the third embodiment of the present invention. In the present embodiment, the upstream duct portion 51 and the downstream duct portion 52 are connected by a connecting portion 53 having a hollow portion and a solid plate-like portion so that the porous duct 2 has a curved shape of about 90 degrees. ing. The hollow portion of the connecting portion 53 is connected to the upstream duct 51 to constitute a resonance silencer, and a hole serving as a mounting portion for the vehicle body is provided at a substantially central portion of the solid plate-like portion of the connecting portion 53. 531 is provided, and a cylindrical guide portion 532 is integrally provided. The guide part 532 is a part through which the porous duct 2 is inserted, and supports a substantially central part of the porous duct 2 at a predetermined position and angle.

According to this embodiment, since the guide portion 532 that supports the porous duct 2 is provided in the connecting portion 53, the path of the porous duct 2 can be routed even when a relatively flexible porous duct is used. Therefore, the porous duct 2 can be prevented from interfering with peripheral members, and the porous duct 2 can be prevented from shaking greatly due to vibration. In the present embodiment, the guide portion has a cylindrical shape, but in addition to this, the guide portion has a half-cracked cylindrical shape, or a concave portion that extends along the outer surface of the porous duct 2 on the side surface of the connecting portion. Various types of guide portions can be provided at the connecting portion, such as providing a guide portion so that the porous duct 2 is in contact with the concave portion.

As mentioned above, although embodiment of this invention was described, this invention is not limited to the said embodiment, In the range which does not change the property of this invention largely, it can also implement by adding the following modifications. it can.

The use of the silencer duct is exemplified by the intake duct of an automobile engine. However, the silencer duct of the present invention is not limited thereto, and is generally applied to ducts that convey and blow air such as cooling air guide ducts, air conditioning, and air conditioning ducts. it can. Moreover, the shape of a duct and the shape of a connection part can also be suitably determined according to a use.

The material of the connecting member 3 is not particularly limited as long as the resin duct can be molded. For example, various plastics (for example, olefin resins such as polyethylene and polypropylene, vinyl resins such as vinyl chloride resins, Polyester resins such as polyethylene terephthalate, polyamide resins such as polyamide 6, thermoplastic resins such as polycarbonate resins; rubber or thermoplastic elastomers; polyurethane resins, etc.) can be used. Of these materials, thermoplastic resins such as polypropylene are particularly preferable from the viewpoints of productivity, moldability, heat resistance, and the like.

Although the example which manufactures precursor 3 'shown in FIG. 3 by the blow molding method was shown as a manufacturing method of the connection member 3, the part corresponding to the duct parts 31 and 32 needs to be necessarily shape | molded in the independent hollow capsule shape. Instead, it may be formed into a shape in which the space between the duct portions 31 and 32 is directly connected as a single duct. In particular, as in the second embodiment shown in FIG. 4, when the internal space of the upstream duct portion and the downstream duct portion is not communicated with each other by the connecting portion, the duct portion 31 of the precursor 3 ′, A precursor shape in which the portions corresponding to 32 are communicated with each other is preferable because the air blow mold structure of blow molding can be simple. On the other hand, as shown in FIG. 3, when the portions corresponding to the duct portions 31 and 32 are formed in an independent hollow capsule shape, there is an effect that the discarded bag portion can be easily cut.
In addition, the connecting member 3 may be formed by an injection molding method or the like. In that case, the connecting member 3 is formed into a pair of half-cracks and bonded and welded to form the connecting member 3. What should I do?

Moreover, although the said embodiment illustrated what connected the duct part and the connection part integrally as a connection member, this invention is not limited to this, A duct part and a connection part are each shape | molded as an independent member. Then, these members may be integrated by bonding or riveting to obtain a connection member.

According to the present invention, even when a relatively flexible duct is used as the porous duct, it is possible to provide a silencing duct that can improve the shape retaining property of the entire silencing duct and simplify the mounting structure to the vehicle body and the like. Industrial value is high, such as space saving and cost reduction.

The figure which shows the structure of the silencer duct of 1st Embodiment of this invention. The figure which shows the structure of the connection member 3. FIG. The figure which shows the precursor of the connection member 3. FIG. The figure which shows the structure of the silencer duct of 2nd Embodiment of this invention. The perspective view which shows the structure of the silencer duct of 3rd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Silencer duct 2 Porous duct 3 Connection member 31 Upstream duct part 32 Downstream duct part 33 Connection part 34, 35 Attachment part 3 'Connection member precursor 4, 5 Connection member 532 Guide part

Claims (6)

A silencer duct in which a pair of resin ducts are connected to both ends of a porous duct formed in a cylindrical shape by a breathable material, and a series of ventilation paths are formed between the resin ducts,
The pair of the resin duct is integrally connected by resin linking member Rutotomoni,
The pair of resin ducts and the resin connecting member are integrally formed,
The resin connecting member has a hollow portion,
A silencer duct, wherein a porous duct is provided outside the hollow portion of the resin connecting member, and the porous duct is exposed to the outside . The muffler duct according to claim 1, wherein the connecting member is provided with a mounting portion. The connecting member is a pipe-shaped member having a hollow portion that communicates with the internal space of both of the pair of resin ducts, and a sub-ventilation path that connects between the resin ducts is formed by the connecting member. The muffler duct according to 1. The silencer duct according to claim 1, wherein the connecting member is a member having a hollow portion communicating with at least one internal space of the pair of resin ducts, and the resonance silencer is configured by the connecting member. The silencer duct according to claim 1, wherein the connecting member is provided with a guide portion that supports an intermediate portion of the porous duct. A resin member connected to a porous duct formed in a cylindrical shape by a breathable material,
A pair of duct members connected to both ends of the porous duct;
A connecting member that connects the pair of duct members and maintains the position and posture of each other is integrally formed ,
The connecting member has a hollow portion;
As a porous duct is provided outside the connecting member hollow portion,
A resin member , wherein a connecting portion for connecting the duct member to the porous duct is provided outside the hollow portion of the connecting member.

Images