JP3440183B2 - Silencer with fixing bracket - Google Patents
Silencer with fixing bracketInfo
- Publication number
- JP3440183B2 JP3440183B2 JP18532296A JP18532296A JP3440183B2 JP 3440183 B2 JP3440183 B2 JP 3440183B2 JP 18532296 A JP18532296 A JP 18532296A JP 18532296 A JP18532296 A JP 18532296A JP 3440183 B2 JP3440183 B2 JP 3440183B2
- Authority
- JP
- Japan
- Prior art keywords
- bracket
- box
- silencer
- main body
- groove
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
- 230000003584 silencer Effects 0.000 title claims description 12
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 239000000057 synthetic resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 238000000071 blow moulding Methods 0.000 description 4
- -1 polypropylene Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Landscapes
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Description
【発明の詳細な説明】
【０００１】
【発明の属する技術分野】この発明は消音器主として固
定用ブラケットを備えた消音器の改良に関する。
【０００２】
【従来の技術】一般に車両では図４及び図５のようにエ
ンジンＥの吸気系（又は排気系）のダクトＤの途中に分
岐パイプＤａを介し所定容器の消音器１を連設し、吸気
騒音や排気騒音を減衰させるようにしており、その消音
器１は主にナイロン，ポリプロピレン，ポリエチレン等
の合成樹脂でブロー成形により中空箱状に形成され、そ
の箱状本体１ａの一端面には首パイプ１ｂを備えてダク
トＤの分岐パイプＤａに接着，溶着又は緊締バンド等の
手段で連結され、他端面には両側に基部から先端に向っ
て高さを低くした三角形の縦リブ２ａをもって凹字状を
なしたブラケット２が突設され、これが止め具Ｔによっ
て横振れしないように車体Ｆに固定されている。
【０００３】そして、上記消音器１の成形には、図６の
ように本体形成用の箱状みぞＭａと首パイプ形成用の半
円状みぞＭｂ及びブラケット形成用の凹字形みぞＭｃを
備えた第１金型Ｍ1 と、本体形成用の箱状みぞＭａと首
パイプ形成用の半円状みぞＭｂだけを備えた第２金型Ｍ
2 が用いられ、この二つの金型Ｍ1 ，Ｍ2 で押出し機Ｅ
のノズルＮから押出されたパリソンＰを挟み込み、圧縮
空気の吹き込みにより、箱状本体１ａ及び首パイプ１ｂ
をブロー成形すると同時にパリソンＰの下端部の樹脂を
凹字形みぞＭｃに押込んでブラケット２を成形するよう
にしている。
【０００４】
【発明が解決しようとする課題】ところで、上記従来の
消音器では、その成形に当たり、第１金型Ｍ 1 には、箱
状みぞＭａの下部に両側に縦みぞ作成用の幅の狭いすじ
みぞを持ったブラケットのための凹字形みぞＭｃを形成
し、その二つのすじみぞにパリソンＰの一部の樹脂を押
し込むようにしているが、両側のすじみぞを深くする
（即ち縦リブ２ａの基部の高さを高くする）と、樹脂が
すじみぞ中にうまく入っていかないため、縦リブ２ａの
基部を充分に高くすることができず、ブラケット２は平
板状になって強度上弱いものとなり、折損し易く、又ブ
ラケット２の張り出し長さも余り長くすることができ
ず、車体に対し固定しにくい場合がある。
【０００５】そこで、この発明は固定用ブラケット付の
消音器として、ブラケット基端部の強度を増加させて折
損しにくいものとすると同時にブラケットの張り出し長
さを大きくして車体に対し取付け易くすることを課題と
する。
【０００６】
【課題を解決するための手段】上記課題のもとにこの発
明は、合成樹脂からなり、所定容積の箱状本体に固定用
のブラケットを備える消音器として、上記箱状本体に連
続する中空な袋部とその先端から外方に伸び断面浅い凹
字状の平坦部からなるブラケットを形成したことを特徴
としている。
【０００７】
【実施の形態】図１，図２はこの発明に係る消音器１１
の一例を示すものであり、ナイロン，ポリプロピレン，
ポリエチレン等の合成樹脂からなり、所定容積の中空な
箱状本体１１ａの一端面中央部には首パイプ１１ｂを備
えていて、エンジンの吸気系又は排気系のダクトＤの分
岐パイプＤａに接着，溶着又は緊締バンド等の手段で連
結するようになされ、又箱状本体１１ａの他端面の中央
部には箱状本体１１ａから連続して中空をなし、基部か
ら先下がりに傾いた側面三角形状の袋部１２ａと、その
先端から外方に伸びる浅いみぞ形の平坦部１２ｂからな
るブラケット１２が形成され、その平坦部１２ｂの部分
が止め具Ｔにより車体Ｆに固定するようになされてい
る。
【０００８】その成形に当たっては、図３のように本体
形成用の箱状みぞＭａの上部に首パイプ形成用の半円状
のみぞＭｂを設けると共に下部に、袋部１２ａ作成のた
めのシュート状みぞＭｃ1 と平坦部１２ｂ作成のための
短かな凹字状みぞＭｃ2 からなるブラケット形成用のみ
ぞＭｃを備えた第１金型Ｍ1 と、本体形成用の箱状みぞ
Ｍａと首パイプ形成用の半円状みぞＭｂだけを備えた第
２金型Ｍ2 が用いられる。
【０００９】これら、第１，第２の金型Ｍ1 ，Ｍ2 によ
って、押出し機のノズルＮから押し出されたパリソンＰ
を挟み込み、パリソンＰ中に圧縮空気を吹き込み、これ
を膨張させれば、箱状本体１１ａ及び首パイプ１１ｂに
併せてブラケット１２の袋部１２ａがブロー成形される
ことになり、それと同時にパリソンＰの下端部の樹脂が
凹字状みぞＭｃ2 に押し込まれ、ブラケット１２の平坦
部１２ｂが形成される。この場合、凹字状みぞＭｃ2 は
浅く短かなものであるため、樹脂はみぞ中に余すところ
なく押し込まれる。
【００１０】このようにブラケット１２の袋部１２ａは
箱状本体１１ａに連続してブロー成形して作られるの
で、その基部の高さや張り出し長さを所望に形成するこ
とができ、これまでのものに比べ剛性が増すと共に車体
への取付けがやり易くなる。
【００１１】その使用時にはダクトＤ内に伝わる吸気系
又は排気系の騒音が分岐パイプＤａ及び首パイプ１１ｂ
を通じて箱状本体１１ａ内に入り、パイプ部分の直径，
長さ及び箱状本体の内容積に対応した特定周波数の騒音
が減衰される。
【００１２】なお、図示の例では、ブラケット袋部１２
ａの形体を角錐台状のものを示したが、これに限らず、
円錐台状，半円筒状等のものとしてもよい。又、平坦部
１２ｂ両側の縦リブは先下がりに傾けてもよい。
【００１３】
【発明の効果】この発明は、固定用ブラケット付の消音
器として上述のように構成されているので、ブラケット
袋部を箱状本体といっしょにブロー成形することがで
き、その基端部の高さを適宜に選定して大きくできると
共に断面形状が環状のものとなり、これまでのものに比
べ強度を増大させることができ、又袋部の張り出し長さ
も適宜に選定してブラケット全体の長さを大きくでき、
車体に対する取付けもやり易くなる。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silencer, and more particularly to an improvement of a silencer having a fixing bracket. 2. Description of the Related Art Generally, in a vehicle, as shown in FIGS. 4 and 5, a silencer 1 of a predetermined container is continuously connected to a duct D of an intake system (or an exhaust system) of an engine E via a branch pipe Da. The silencer 1 is formed into a hollow box shape by blow molding with a synthetic resin such as nylon, polypropylene, or polyethylene, and is provided on one end surface of the box-shaped main body 1a. Is provided with a neck pipe 1b and is connected to a branch pipe Da of the duct D by means of bonding, welding, or a tightening band. The other end face has a triangular vertical rib 2a having a height decreasing from the base toward the tip on both sides. A bracket 2 having a concave shape is protruded, and is fixed to the vehicle body F by a stopper T so that the bracket 2 does not swing. The muffler 1 is formed with a box-shaped groove Ma for forming a main body, a semi-circular groove Mb for forming a neck pipe, and a concave groove Mc for forming a bracket, as shown in FIG. A second mold M having only a first mold M1, a box-shaped groove Ma for forming a main body, and a semicircular groove Mb for forming a neck pipe.
The extruder E is used by these two molds M 1 and M 2.
Of the box-shaped body 1a and the neck pipe 1b by sandwiching the parison P extruded from the nozzle N of
And the resin at the lower end of the parison P is pressed into the concave groove Mc to form the bracket 2 at the same time. [0004] By the way, in the above-mentioned conventional silencer, the first mold M 1 In the lower part of the box-shaped groove Ma, a concave groove Mc for a bracket having narrow stripes for forming vertical grooves on both sides is formed, and a part of the resin of the parison P is formed in the two grooves. However, if the grooves on both sides are deepened (that is, if the height of the base of the vertical rib 2a is increased), the resin does not enter into the grooves easily, so that the base of the vertical rib 2a is sufficiently inserted. The bracket 2 becomes flat and weak in strength, is easily broken, and the overhang length of the bracket 2 cannot be too long, so that it may be difficult to fix the bracket 2 to the vehicle body. . Accordingly, the present invention provides a silencer with a fixing bracket, which increases the strength of the base end of the bracket to make it less likely to break, and at the same time, increases the overhang length of the bracket to facilitate attachment to the vehicle body. As an issue. SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention provides a silencer made of synthetic resin and having a box-shaped main body having a predetermined volume and a fixing bracket attached to the box-shaped main body. A bracket formed of a continuous hollow bag portion and a flat portion having a shallow cross section and extending outward from the tip thereof is formed. 1 and 2 show a muffler 11 according to the present invention.
This is an example of nylon, polypropylene,
A hollow box-shaped main body 11a having a predetermined volume is provided with a neck pipe 11b at the center of one end face thereof, and is bonded and welded to a branch pipe Da of a duct D of an intake system or an exhaust system of an engine. Alternatively, a bag having a side surface triangular shape is formed so as to be connected to the center of the other end surface of the box-shaped main body 11a continuously from the box-shaped main body 11a and inclined downward from the base. A bracket 12 composed of a portion 12a and a shallow groove-shaped flat portion 12b extending outward from the end thereof is formed, and the flat portion 12b is fixed to the vehicle body F by a stopper T. In the molding, as shown in FIG. 3, a semi-circular groove Mb for forming a neck pipe is provided at an upper portion of a box-shaped groove Ma for forming a main body, and a chute-like shape for forming a bag portion 12a is provided at a lower portion. a first mold M 1 having a groove Mc of bracket formed consisting of short pinion concave shaped groove Mc 2 for the flat portion 12b create a groove Mc 1, box-shaped groove Ma and neck pipe forming for body forming second mold M 2 having only a semicircular groove Mb of use is used. The parison P extruded from the nozzle N of the extruder by the first and second molds M 1 and M 2 .
When compressed air is blown into the parison P and expanded, the bag portion 12a of the bracket 12 is blow-molded along with the box-shaped main body 11a and the neck pipe 11b. the lower end of the resin is pushed into concave shape groove Mc 2, the flat portion 12b of the bracket 12 is formed. In this case, since concave shaped groove Mc 2 is a shallow short hardware, resin is pushed the very best in the groove. As described above, since the bag portion 12a of the bracket 12 is formed by blow molding continuously to the box-shaped main body 11a, the height of the base portion and the overhang length can be formed as desired. The rigidity is increased and the mounting on the vehicle body is facilitated. In use, the noise of the intake system or the exhaust system transmitted into the duct D is generated by the branch pipe Da and the neck pipe 11b.
Into the box-shaped main body 11a through the
Noise of a specific frequency corresponding to the length and the inner volume of the box-shaped main body is attenuated. In the illustrated example, the bracket bag 12
The shape of a is shown as a truncated pyramid, but is not limited to this.
The shape may be a truncated cone, a semi-cylindrical shape, or the like. The vertical ribs on both sides of the flat portion 12b may be inclined downward. According to the present invention, since the silencer with the fixing bracket is configured as described above, the bracket bag can be blow-molded together with the box-shaped main body, and the base end thereof can be formed. The height of the part can be appropriately selected and increased, and the cross-sectional shape becomes annular, so that the strength can be increased as compared with the conventional one, and the overhang length of the bag part is also appropriately selected and Length can be increased,
Installation to the vehicle body is also easy.
【図面の簡単な説明】
【図１】この発明に係る消音器の一例の取付け状態を示
す斜視図。
【図２】その断面図。
【図３】ブロー成形用金型の分離斜視図。
【図４】消音器の使用状態を示す側面図。
【図５】従来の消音器の取付け状態を示す斜視図。
【図６】従来のブロー成形用金型の分離斜視図。
【符号の説明】
１１ 消音器 １１ａ 箱状本
体
１１ｂ 首パイプ １２ ブラケッ
ト
１２ａ 袋部 １２ｂ 平坦部
Ｄ ダクト Ｆ 車体BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an attached state of an example of a muffler according to the present invention. FIG. 2 is a sectional view thereof. FIG. 3 is an exploded perspective view of a blow molding die. FIG. 4 is a side view showing a use state of the muffler. FIG. 5 is a perspective view showing an attached state of a conventional silencer. FIG. 6 is an exploded perspective view of a conventional blow molding die. [Description of Signs] 11 Silencer 11a Box-shaped main body 11b Neck pipe 12 Bracket 12a Bag portion 12b Flat portion D Duct F Body
Claims (1)
に固定用のブラケットを備える消音器において、上記箱
状本体に連続する中空な袋部とその先端から外方に伸び
断面浅い凹字状の平坦部からなるブラケットを形成した
ことを特徴とする固定用ブラケット付の消音器。(57) [Claims] [Claim 1] A box-shaped main body made of synthetic resin and having a predetermined volume
In muffler comprising a bracket for fixing to said box
A silencer with a fixing bracket, characterized in that a bracket consisting of a hollow bag portion continuous with the main body and a flat portion having a concave cross section extending outward from the tip thereof is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18532296A JP3440183B2 (en) | 1996-06-27 | 1996-06-27 | Silencer with fixing bracket |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18532296A JP3440183B2 (en) | 1996-06-27 | 1996-06-27 | Silencer with fixing bracket |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH109072A JPH109072A (en) | 1998-01-13 |
| JP3440183B2 true JP3440183B2 (en) | 2003-08-25 |
Family
ID=16168811
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18532296A Expired - Fee Related JP3440183B2 (en) | 1996-06-27 | 1996-06-27 | Silencer with fixing bracket |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3440183B2 (en) |
-
1996
- 1996-06-27 JP JP18532296A patent/JP3440183B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH109072A (en) | 1998-01-13 |
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