【考案の詳細な説明】 本考案は小型エンジン等に適したエアクリーナ
の消音構造に関する。[Detailed Description of the Invention] The present invention relates to a silencing structure for an air cleaner suitable for small engines and the like.
断面略図である第１図の如く、従来からエアク
リーナには吸気音消音のために抵抗型又は共鳴型
の消音部１を設けるか、あるいは吸気孔２を絞る
構造が採用されている。ところが抵抗型の消音部
や吸気孔絞り構造を採用すると、空気抵抗が大き
くなるのでエンジンの吸気効率が下がり、出力が
低下するという問題がある。又共鳴型消音部１で
はスペース上の制約によりその容量を大きくする
ことができず、そのために共鳴周波数を低く設定
することが不可能になつて充分な消音効果を上げ
ることができないという欠点がある。なお先行技
術として実開昭49−84503号、実開昭48−62405
号、実公昭46−15523号がある。 As shown in FIG. 1, which is a schematic cross-sectional view, air cleaners have conventionally been provided with a resistance-type or resonance-type muffling section 1 to muffle intake noise, or have adopted a structure in which an air intake hole 2 is narrowed. However, if a resistance-type muffling section or intake hole throttle structure is adopted, there is a problem in that air resistance increases, which reduces the intake efficiency of the engine and reduces output. Furthermore, the capacity of the resonant silencing section 1 cannot be increased due to space constraints, which makes it impossible to set the resonant frequency low, which makes it impossible to achieve a sufficient silencing effect. . As prior art, Utility Model Application No. 49-84503, Utility Model Application No. 48-62405
There is a No. 15523, Jikko No. 46-15523.
本考案は上記問題を解決するために、多数の連
通孔を有する樹脂又はゴムにより消音部を形成し
たもので、図面により説明すると次の通りであ
る。 In order to solve the above-mentioned problem, the present invention forms a sound deadening section using resin or rubber having a large number of communication holes, and will be explained as follows with reference to the drawings.
断面略図である第２図において、エアクリーナ
エレメント３を収容した硬質樹脂製や板金製等の
エアクリーナボデイ４は入口５を形成する筒状部
６を備え、筒状部６の外周に消音部７の薄肉筒状
端部９が嵌合してバンド１０により固定されてい
る。消音部７は内部に多数の連通孔１１を有する
合成樹脂又はゴムの一体成型品で、薄肉筒状の両
端部９，１２を除いて全体が厚肉の筒状に成型さ
れており、中心部に吸気通路１３を備えている。
吸気通路１３の一端は入口５に連通し、他端は外
部に開口して吸気孔１４となつている。前記連通
孔１１は吸気通路１３の内面１５に開口してお
り、又消音部７の外面１６では閉鎖又は開口して
いる。外面１６はカバー等で覆われておらず、外
面１６が外部に露出して消音部７の外皮を形成し
ている。 In FIG. 2, which is a schematic cross-sectional view, an air cleaner body 4 made of hard resin or sheet metal that houses an air cleaner element 3 is provided with a cylindrical portion 6 that forms an inlet 5, and a silencing portion 7 is provided on the outer periphery of the cylindrical portion 6. The thin-walled cylindrical end portion 9 is fitted and fixed by a band 10. The silencing part 7 is an integrally molded product of synthetic resin or rubber that has a large number of communication holes 11 inside, and is entirely molded into a thick-walled cylindrical shape except for both thin-walled cylindrical ends 9 and 12. The air intake passage 13 is provided with an intake passage 13.
One end of the intake passage 13 communicates with the inlet 5, and the other end opens to the outside to form an intake hole 14. The communication hole 11 opens on the inner surface 15 of the intake passage 13, and is closed or open on the outer surface 16 of the muffling section 7. The outer surface 16 is not covered with a cover or the like, and is exposed to the outside to form the outer skin of the sound deadening section 7.
エンジン運転状態において、吸気孔１４から吸
気通路１３へ吸入された空気は入口５からエアク
リーナボデイ４内へ流入し、エレメント３を通つ
てキヤブレター（図示せず）へ送られる。この動
作において吸気通路１３内へエンジン側の吸気音
が達するが、消音部７自体が低周波吸音材として
作用し、吸気音が多数の連通孔１１内へ拡散して
吸収されるので、外部に吸気音が伝わることは防
止される。又吸気通路１３は全長にわたつて大き
い内径を有し、絞りや低抗部を備えていないの
で、吸気流に大きい抵抗は加わらず、エンジンの
吸気効率は充分に高く維持される。 In the engine operating state, air taken into the intake passage 13 from the intake hole 14 flows into the air cleaner body 4 from the inlet 5, passes through the element 3, and is sent to a carburetor (not shown). During this operation, intake noise from the engine reaches the intake passage 13, but the noise damping part 7 itself acts as a low-frequency sound absorbing material, and the intake noise is diffused into the many communication holes 11 and absorbed, so that it is not transmitted to the outside. Intake noise is prevented from being transmitted. Furthermore, since the intake passage 13 has a large inner diameter over its entire length and is not provided with a throttle or a low resistance portion, no large resistance is applied to the intake flow, and the intake efficiency of the engine is maintained at a sufficiently high level.
エンジン運転中等には消音部７に振動が伝わる
が、消音部７は発泡樹脂等の軽量弾性体だけで形
成されているので、消音部７が破損したり筒状部
６から外れたりすることはない。なお消音部７の
振動等を確実に防止したい場合には、消音部７の
吸気孔１４寄りの部分等をバンド１９又はその他
の部材により機体フレーム等に取り付けることも
できる。 Vibrations are transmitted to the muffling section 7 during engine operation, but since the muffling section 7 is made only of lightweight elastic material such as foamed resin, the muffling section 7 will not be damaged or come off from the cylindrical section 6. do not have. Note that if it is desired to reliably prevent vibrations of the muffling section 7, a portion of the muffling section 7 near the intake hole 14 can be attached to the body frame or the like using a band 19 or other member.
以上説明したように本考案によると、多数の連
通孔１１を有する樹脂又はゴムの一体成型品によ
り消音部７を形成し、消音部７をエアクリーナボ
デイ４に取り付け、エアクリーナボデイ４の入口
５に接続する吸気通路１３を消音部７に設け、吸
気通路１３に連通孔１１を連通させ、消音部７の
外皮を上記一体成型品の表面１６で形成したの
で、連通孔１１を利用して吸気音を消すことがで
きる。従つて従来の共鳴型の場合に比べて消音部
７をコンパクトにし、かつ充分な消音効果を得る
ことができると共に、従来の抵抗型や吸気孔絞り
型の場合に比べて空気抵抗を減少させ、エンジン
の吸気効率を上げて出力を向上させることができ
る。又消音部７は樹脂等の一体成型品だけででき
ているので、製作が容易であると共に、例えばバ
ンド１０だけで簡単にエアクリーナボデイ４に取
り付けることができる。 As explained above, according to the present invention, the sound muffling section 7 is formed by an integrally molded product of resin or rubber having a large number of communication holes 11, the sound muffling section 7 is attached to the air cleaner body 4, and is connected to the inlet 5 of the air cleaner body 4. An intake passage 13 is provided in the noise muffling part 7, and the communication hole 11 is communicated with the intake passage 13, and the outer skin of the muffler part 7 is formed of the surface 16 of the above-mentioned integrally molded product. Can be erased. Therefore, compared to the conventional resonance type, the silencing section 7 can be made more compact and a sufficient silencing effect can be obtained, and the air resistance can be reduced compared to the conventional resistance type or intake hole throttle type. It is possible to increase the engine's intake efficiency and improve the output. Furthermore, since the muffling section 7 is made of only an integrally molded product such as resin, it is easy to manufacture and can be easily attached to the air cleaner body 4 using only the band 10, for example.
なお第２図の構造に代えて、第３図の如く吸気
通路１３ａを入口５の近傍から下方へ湾曲させて
下向きに開口させると共に、吸気通路１３ａの途
中の内壁面１５ａ部分に共鳴室２０（窪み）を設
けることもでき、このようにすると連通孔１１を
利用した吸音効果の他に、共鳴室２０での干渉に
よる吸音効果を得ることができる。なお第３図に
おいて消音部７はビス２１によりエアクリーナボ
デイ４の壁面に固定されている。 Note that instead of the structure shown in FIG. 2, as shown in FIG. 3, the intake passage 13a is curved downward from the vicinity of the inlet 5 to open downward, and a resonance chamber 20 ( A recess) may also be provided, and in this way, in addition to the sound absorption effect using the communication hole 11, a sound absorption effect due to interference in the resonance chamber 20 can be obtained. Note that in FIG. 3, the muffling section 7 is fixed to the wall surface of the air cleaner body 4 by screws 21.
勿論本考案を具体化する場合、図示した以外の
通路構造を採用することができ、いずれの場合で
も、消音部７が一体成型品だけで作られているの
で、複雑な組立工程等を必要とせずに所望の構造
に仕上げることができる。 Of course, when embodying the present invention, it is possible to adopt a passage structure other than that shown in the drawings, and in any case, since the muffling section 7 is made only of an integrally molded product, a complicated assembly process etc. is not required. You can finish the desired structure without any trouble.
第１図は従来例の断面略図、第２図は本考案実
施例の断面略図、第３図は別の実施例の断面略図
である。４……エアクリーナボデイ、５……入
口、７……消音部、１１……連通孔、１３……吸
気通路、１６……表面。 FIG. 1 is a schematic cross-sectional view of a conventional example, FIG. 2 is a schematic cross-sectional view of an embodiment of the present invention, and FIG. 3 is a schematic cross-sectional view of another embodiment. 4... Air cleaner body, 5... Inlet, 7... Sound deadening section, 11... Communication hole, 13... Intake passage, 16... Surface.
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3368283UJPS59139573U (en) | 1983-03-08 | 1983-03-08 | Air cleaner noise reduction structure |
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3368283UJPS59139573U (en) | 1983-03-08 | 1983-03-08 | Air cleaner noise reduction structure |
| Publication Number | Publication Date |
|---|---|
| JPS59139573U JPS59139573U (en) | 1984-09-18 |
| JPH0124366Y2true JPH0124366Y2 (en) | 1989-07-24 |
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3368283UGrantedJPS59139573U (en) | 1983-03-08 | 1983-03-08 | Air cleaner noise reduction structure |
| Country | Link |
|---|---|
| JP (1) | JPS59139573U (en) |
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6642253B2 (en) | 2016-05-09 | 2020-02-05 | トヨタ紡織株式会社 | Air cleaner for internal combustion engine |
| Publication number | Publication date |
|---|---|
| JPS59139573U (en) | 1984-09-18 |
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