JPH0249963A - Intake device for internal combustion engine - Google Patents
Intake device for internal combustion engineInfo
- Publication number
- JPH0249963A JPH0249963A JP19768688A JP19768688A JPH0249963A JP H0249963 A JPH0249963 A JP H0249963A JP 19768688 A JP19768688 A JP 19768688A JP 19768688 A JP19768688 A JP 19768688A JP H0249963 A JPH0249963 A JP H0249963A
- Authority
- JP
- Japan
- Prior art keywords
- intake passage
- chamber
- engine
- wall surface
- intake
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 15
- 238000005192 partition Methods 0.000 claims abstract description 8
- 230000003584 silencer Effects 0.000 abstract description 8
- 230000000630 rising effect Effects 0.000 abstract description 4
- 235000014676 Phragmites communis Nutrition 0.000 abstract description 2
- 238000011144 upstream manufacturing Methods 0.000 abstract description 2
- 230000030279 gene silencing Effects 0.000 description 12
- 230000000694 effects Effects 0.000 description 3
- 238000013016 damping Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000002000 scavenging effect Effects 0.000 description 1
Landscapes
- Characterised By The Charging Evacuation (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は内燃機関の吸気装置に保つ、特に気化器から機
関本体に連なる吸気通路に共鳴型消音室を設けたものに
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intake system for an internal combustion engine, in particular an intake passage extending from a carburetor to an engine body, in which a resonant muffling chamber is provided.
［従来の技術］
従来より、Ｓ化器から機関本体に連なる吸気通路に共鳴
型消音室を設け、この消音室によって特定母波数の吸気
騒音を消音するとともに、吸気効率を高めて出力の向上
を図ることか行なわれている。この種の従来例として例
えば米国特許部２゜０１４．３７１号に記載のものかあ
る。このような消音室は、通常、吸気通路に設けられる
吸気弁やリード弁に近接する位置において、比較的通路
面積の小さい連通路を介して吸気通路から外方に突出し
て設けられている。[Prior art] Conventionally, a resonant silencing chamber has been provided in the intake passage leading from the S converter to the engine body, and this silencing chamber has been used to muffle intake noise at a specific frequency, and also to improve intake efficiency and output. Something is being done. A conventional example of this type is, for example, the one described in U.S. Pat. No. 2,014,371. Such a muffling chamber is usually provided at a position close to an intake valve or a reed valve provided in the intake passage, protruding outward from the intake passage via a communication passage having a relatively small passage area.
〔発明か解決しようとする課題］
ところで、内燃機関か小型船舶などに使用される場合に
おいては、機関全体の高さか低く抑えられなければなら
ないという大きな制限かあり、この高さ制限を満足しつ
つ共鳴型消音室を吸気通路に設けることは非常に困難で
あった。特に、消音室と吸気通路とを連通せしめる連通
路は、消音すべき特定周波数に直接影響を与えるもので
あるため、その連通路の長さは単純に短縮させることが
できず、従って、消音室は勢い吸気通路から大幅に突出
することを余儀なくされていた。[Problem to be solved by the invention] By the way, when an internal combustion engine is used in a small boat, etc., there is a big restriction that the height of the entire engine must be kept low, and it is difficult to satisfy this height restriction while keeping the height of the engine low. It has been extremely difficult to provide a resonance type muffling chamber in the intake passage. In particular, the communication passage that connects the silencing chamber and the intake passage has a direct effect on the specific frequency that should be silenced, so the length of the communication passage cannot be simply shortened. was forced to protrude significantly from the intake passage.
本発明は、このような従来技術の問題点に鑑みなされた
もので、その目的とするところは、内燃機関全体の扁さ
を高くする必要なく、所望の消音機能および内燃機関の
性能向上機能を充分に発揮てきる共）型消音室を有する
内燃機関の吸気装置を提供するにある。The present invention was made in view of the problems of the prior art, and its purpose is to provide the desired silencing function and performance improvement function of the internal combustion engine without increasing the overall profile of the internal combustion engine. An object of the present invention is to provide an intake system for an internal combustion engine having a silencing chamber of the same type that can be fully utilized.
［課題を解決するための手段］
本発明は、このような目的を達成するために、気化器か
ら機関本体に連なる吸気通路に共鳴型消音室を設けた内
燃機関の吸気装置において、共鳴型消音室の一区画壁を
吸気通路の壁面により構成したものである。[Means for Solving the Problems] In order to achieve such an object, the present invention provides an intake system for an internal combustion engine in which a resonant silencing chamber is provided in an intake passage leading from a carburetor to an engine body. One partition wall of the chamber is constituted by the wall surface of the intake passage.
［作用］
このように、共鳴型消音室の一区画壁を吸気通路の壁面
で構成することにより、消音室か大幅に突出することは
防上され、必要な連通路の長さや断面植は消音室自体の
中で確保することかできる。[Function] In this way, by configuring one partition wall of the resonant sound-dampening chamber with the wall of the intake passage, the sound-damping chamber is prevented from protruding significantly, and the required length and cross-section of the communication channel are It can be secured within the room itself.
［実施例］ 以下本発明を図面に示す実施例に基いて説明する。[Example] The present invention will be explained below based on embodiments shown in the drawings.
第１図には本発明を２サイクル内燃機関、特に船内外機
用の水平置きの内燃機関に適用した場合の実施例が示さ
れている。ここに符号１０で示すのはエンジン全体であ
り、クランク室１２内に横置き配置されたクランク軸１
４に、各気筒に応じてそれぞれコンロッド１６を介して
ピストン１８か水平に対向して配置されている。各ピス
トン１８を有する各気筒に掃気通路２０および排気通路
２２か開口し、ピストン１８が水平に摺動することによ
りこれらを一定のサイクルで開閉する。FIG. 1 shows an embodiment in which the present invention is applied to a two-stroke internal combustion engine, particularly a horizontally placed internal combustion engine for an inboard/outboard motor. Here, reference numeral 10 indicates the entire engine, including a crankshaft 1 placed horizontally in a crank chamber 12.
4, pistons 18 are arranged horizontally opposite to each other via connecting rods 16, depending on each cylinder. A scavenging passage 20 and an exhaust passage 22 are opened in each cylinder having each piston 18, and as the piston 18 slides horizontally, these are opened and closed in a constant cycle.
なお２４はシリンダヘット、２６は点火栓を示す。クラ
ンク室１２にはリート弁２８を有する吸気通路３０か接
続され、この吸気通路３０の上流側には気化器３２およ
び吸気サイレンサ３４か接続されている。Note that 24 represents a cylinder head, and 26 represents a spark plug. An intake passage 30 having a Riet valve 28 is connected to the crank chamber 12, and a carburetor 32 and an intake silencer 34 are connected to the upstream side of the intake passage 30.
吸気通路３０の壁面３６には一体的に一対の立上り壁３
８．４０か図の上方に突出して形成され、各立上り壁３
８．４０の上端部にカバー４２か装着され、これによっ
て吸気通路３０の壁面３６を一区画壁とする消音室４４
か吸気通路３０に隣接して形成されることになる。また
、吸気通路３０の壁面３６には一体的に連通路４６が、
該壁面３６を一体的に立上げることにより形成され、こ
の連通路４６によって吸気通路３０は消音室４４と連通
している。なお４８はドレン通路である。A pair of rising walls 3 are integrally formed on the wall surface 36 of the intake passage 30.
8.40 or each rising wall 3 is formed to protrude upwards in the figure.
8. A cover 42 is attached to the upper end of the 40, thereby creating a sound deadening chamber 44 that uses the wall surface 36 of the intake passage 30 as a partition wall.
It is formed adjacent to the intake passage 30. Further, a communication passage 46 is integrally formed on the wall surface 36 of the intake passage 30.
It is formed by integrally raising the wall surface 36, and the intake passage 30 communicates with the silencing chamber 44 through the communication passage 46. Note that 48 is a drain passage.
このように吸気通路３０に連通路４６を介して消音室４
４を設けることにより、例えば連通路４６の通路直径を
ｄ、長さを交、消音室４４の容積をＶ、音速をＣとする
と、以下の共鳴周波数ｆｏか得られ、この周波数の音か
消音される。In this way, the silencing chamber 4 is connected to the intake passage 30 via the communication passage 46.
4, for example, if the diameter of the communication passage 46 is d, the lengths are intersecting, the volume of the silencing chamber 44 is V, and the speed of sound is C, the following resonant frequency fo can be obtained, and the sound of this frequency can be muted. be done.
このように、この実施例によれば、共鳴型の消音室４４
を吸気通路３０の壁面３６を一区画壁として利用して設
けるので１例えば気化器３２に接続される吸気サイレン
サ３４の高さよりも低くこの消音室４４の高さを抑える
ことができ、従って内燃機関全体としての高さを低くし
て小型船舶等に有効なものとすることかできる。In this way, according to this embodiment, the resonance type silencing chamber 44
Since the wall surface 36 of the intake passage 30 is provided as a partition wall, the height of the silencing chamber 44 can be kept lower than, for example, the height of the intake silencer 34 connected to the carburetor 32, and therefore the internal combustion engine The overall height can be reduced to make it effective for small ships and the like.
次に第２図には本発明の第２実施例が示され、この実施
例は本発明を４サイクルエンジン５０、特にＶＪ５の内
燃機関に適用したものである。ここても吸気通路３０の
壁面３６を一体的に立Ｅからせて立上り壁３８．４０を
形成するとともにカバー４２を装着して消音室４４を形
成し、連通路４６を介してこの消音室４４を吸気通路３
０に連通せしめている。なお５２は吸気弁、５４はエア
クリーナである。Next, FIG. 2 shows a second embodiment of the present invention, in which the present invention is applied to a four-stroke engine 50, particularly a VJ5 internal combustion engine. Here too, the wall surface 36 of the intake passage 30 is integrally made upright E to form a rising wall 38, 40, and a cover 42 is attached to form a silencing chamber 44. Intake passage 3
It is connected to 0. Note that 52 is an intake valve, and 54 is an air cleaner.
この実施例でも消音室４４の高さは少なくともエアクリ
ーナ５４よりも低く抑えることができ、内燃機関全体の
小型化が達成できる。Also in this embodiment, the height of the muffling chamber 44 can be kept lower than at least the air cleaner 54, and the overall size of the internal combustion engine can be reduced.
［効果」
以り説明したように、本発明によれば、共鳴型の消音室
の一区画壁を吸気通路の壁面により構成したので、この
消音室を吸気通路から大きく突出させる必要かなくなり
、内燃機関全体の小型化を達成できるという優れた効果
かある。[Effects] As explained above, according to the present invention, one partition wall of the resonance type muffling chamber is constituted by the wall surface of the intake passage, so there is no need for this muffling chamber to protrude greatly from the intake passage, and the internal combustion is reduced. This has the excellent effect of making the entire engine smaller.
第１図は本発明に係る内燃機関の吸気装置の第１実施例
を示す断面図、第２図は本発明の第２実施例を示す模式
図である。
１０・・・エンジシ
３０・・・吸気通路
３２・・・気化器
３６・・・壁面
４４・・・消音室
４６・・・連通路
５０・・・エンジンFIG. 1 is a sectional view showing a first embodiment of an intake system for an internal combustion engine according to the present invention, and FIG. 2 is a schematic diagram showing a second embodiment of the present invention. 10... engine 30... intake passage 32... carburetor 36... wall surface 44... muffling chamber 46... communication passage 50... engine
Claims (1)
音室を設けた内燃機関の吸気装置において、共鳴型消音
室の一区画壁を吸気通路の壁面により構成した内燃機関
の吸気装置。(1) An intake system for an internal combustion engine in which a resonance-type muffling chamber is provided in an intake passage leading from a carburetor to an engine body, in which a partition wall of the resonance-type muffling chamber is formed by a wall of the intake passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19768688A JPH0249963A (en) | 1988-08-08 | 1988-08-08 | Intake device for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19768688A JPH0249963A (en) | 1988-08-08 | 1988-08-08 | Intake device for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0249963A true JPH0249963A (en) | 1990-02-20 |
Family
ID=16378662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19768688A Pending JPH0249963A (en) | 1988-08-08 | 1988-08-08 | Intake device for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0249963A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7921963B2 (en) | 2006-03-31 | 2011-04-12 | Honda Motor Co., Ltd. | Internal combustion engine equipped with intake silencer |
-
1988
- 1988-08-08 JP JP19768688A patent/JPH0249963A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7921963B2 (en) | 2006-03-31 | 2011-04-12 | Honda Motor Co., Ltd. | Internal combustion engine equipped with intake silencer |
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