JPS6130493A - Top cowling for outboard engine - Google Patents

Top cowling for outboard engine

Info

Publication number
JPS6130493A
JPS6130493A JP15189184A JP15189184A JPS6130493A JP S6130493 A JPS6130493 A JP S6130493A JP 15189184 A JP15189184 A JP 15189184A JP 15189184 A JP15189184 A JP 15189184A JP S6130493 A JPS6130493 A JP S6130493A
Authority
JP
Japan
Prior art keywords
cowling
intake
low frequency
sound
noise
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
Application number
JP15189184A
Other languages
Japanese (ja)
Inventor
Toru Yonezawa
徹 米沢
Sadakazu Nakajima
中嶋 貞和
Katsuyuki Morichika
森近 勝行
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Yanmar Co Ltd
Original Assignee
Yanmar Diesel Engine Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Yanmar Diesel Engine Co Ltd filed Critical Yanmar Diesel Engine Co Ltd
Priority to JP15189184A priority Critical patent/JPS6130493A/en
Publication of JPS6130493A publication Critical patent/JPS6130493A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B61/00Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
    • F02B61/04Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
    • F02B61/045Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00Component parts, details or accessories, not otherwise provided for
    • F02B77/11Thermal or acoustic insulation
    • F02B77/13Acoustic insulation
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02BINTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B3/00Engines characterised by air compression and subsequent fuel addition
    • F02B3/06Engines characterised by air compression and subsequent fuel addition with compression ignition

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Ocean & Marine Engineering (AREA)
  • Exhaust Silencers (AREA)

Abstract

PURPOSE:To obtain a cowling construction which is effective for a Diesel engine having a large low frequency noise by forming a cowling as a whole into an expansion type muffler which greatly damps down a sound of low frequency. CONSTITUTION:Intake air from an air intake 7 gets out in the right and left directions from a gap between an upper cowling 6 and a ceiling plate 34, passes through both sides of a recessed part 37, and is discharged from intake air outlets at the center and on both right and left sides, toward intake pipes 8, 8 sides. On the other hand, the sound of intake air given forth from the intake pipes 8, 8, is outwardly released through an intake air introducing passage 35 after once discharged into the space 9 of a top cowling 4. This process as a whole constitutes an expansion type muffler which greatly damps down a sound at a low frequency range, thereby, sufficiently muffling a low frequency sound. Accordingly, an outboard Diesel engine with low noise can be obtained, as a cowling construction which is effective for a Diesel engine with a large low frequency noise.

Description

【発明の詳細な説明】 産業上の利用分野 この発明は、主としてデーゼル機関を搭載した船外機の
トップカウリングであって、特に機関騒音を低減するこ
とを目的としたものに関する。
DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates primarily to a top cowling for an outboard motor equipped with a diesel engine, particularly for the purpose of reducing engine noise.

従来の技術 第11図は、従来形トップカウリングを備えた船外機の
全体構造を示している。図において41)は、その下端
にプロペラ(2)を備えたドライブユニットケースで、
該ケース(1)上端に機関(3)が搭載されるとともに
、同じくドライブユニットケース(11上端に取付けた
トップカウリング(4)によって該機関(3)を覆って
いる。このトップカウリング(4)は、下半部を構成す
るボトムカウリング(5)と上半部を構成するアッパカ
ウリング(6)とからなり、アッパカウリング(6)の
上面部に吸気取入口(7)を開口し、この吸気取入口(
7)より導入した吸気を機関吸気管(吸気慣性管を含む
)(8)より吸入させるようにしている。このような構
造において、吸気管(8)より発生した吸気騒音は、カ
ウリング(4)内から吸気取入口+7)を通って外部へ
放散される。
BACKGROUND OF THE INVENTION FIG. 11 shows the overall structure of an outboard motor equipped with a conventional top cowling. In the figure, 41) is a drive unit case equipped with a propeller (2) at its lower end.
An engine (3) is mounted on the upper end of the case (1), and the engine (3) is covered by a top cowling (4) that is also attached to the upper end of the drive unit case (11). Consisting of a bottom cowling (5) constituting the lower half and an upper cowling (6) constituting the upper half, an intake port (7) is opened in the upper surface of the upper cowling (6), and the intake port (
7) The intake air introduced through the engine intake pipe (including the intake inertia pipe) (8) is made to be taken in through the engine intake pipe (including the intake inertia pipe). In such a structure, intake noise generated from the intake pipe (8) is radiated from inside the cowling (4) to the outside through the intake port +7).

また、上記吸気取入口部分よりの吸気音を減少させるこ
とを目的としてなされたものとして、該トップカウリン
グを二重壁構造として通過表面積の大きな吸気通路を、
その通路端がキャブレタに向かい合うようにして形成し
、前記通過表面での吸音効果を増大させたものがある(
実公昭52−27506号公報)。
In addition, with the aim of reducing the intake noise from the intake port, the top cowling has a double wall structure to create an intake passage with a large passage surface area.
There is one in which the passage end is formed to face the carburetor to increase the sound absorption effect on the passage surface (
Utility Model Publication No. 52-27506).

、発明が解決しようとする問題点 一般に、船外機の機関騒音は、機関それ自体が発する比
較的高周波の騒音と吸気音婦よる比較的低周波の騒音と
に分かれる。特に、ディーゼル機関においては、キャブ
レタ等による吸気絞りがないため低周波の騒音が大きと
いう問題があり、このような吸気音は吸気慣性効果を持
たせると更に増大する。
Problems to be Solved by the Invention In general, the engine noise of an outboard motor is divided into relatively high-frequency noise generated by the engine itself and relatively low-frequency noise caused by the intake sound. In particular, diesel engines have the problem of large low-frequency noise because there is no intake throttle provided by a carburetor or the like, and such intake noise will further increase if an intake inertia effect is added.

第9図の実線グラフは、前記第1図のカウリング構造に
おいて、吸気取入口(7)より放散される騒音の減衰量
を示したものであって、これで解かるように、吸気音成
分である特に300Hz以下の低周波騒音については、
減衰効果が非常に少ないことが解かる。即ち、第1図従
来構造のトップカウリングでは、低周波騒音に対する充
分な清音効果を得ることができない欠点がある。
The solid line graph in FIG. 9 shows the amount of attenuation of the noise emitted from the intake port (7) in the cowling structure shown in FIG. 1. As can be seen, the intake sound component Regarding low frequency noise, especially below 300Hz,
It can be seen that the damping effect is very small. That is, the top cowling of the conventional structure shown in FIG. 1 has the disadvantage that it cannot obtain a sufficient sound-cleaning effect against low-frequency noise.

また、上記カウリング壁の内部に吸音材を張り付けるこ
とも勇えられるが、かかる吸音材もまたやはり高周波騒
音に対しては消音効果があるとしても、低周波騒音に対
しては充分な消音効果を得ることができないものである
It is also possible to paste a sound-absorbing material inside the cowling wall, but although such a sound-absorbing material also has a silencing effect on high-frequency noise, it is insufficiently effective against low-frequency noise. It is something that cannot be obtained.

他方、前記実公昭51−27506号公報においても、
その目的が吸気通路壁の吸音効果によるものであって、
やはり高周波騒音に対しては効果があるとしても、低周
波騒音に対する充分な消音効果を得ることができないも
のである。更に、この実公昭52−27506号公報に
示されたカウリング全体を、1つの消音器として見た場
合の消音器モデルを第12図に示している。この図にお
いて、(11)は機関のキャプレタ、(12)はカウリ
ング壁部に形成された吸気通路、(13)は、カウリン
グ内の空間部を示しており、キャブレタ(11)の吸気
口より発生する吸気騒音は、該キャブレタ(11)から
吸気通路(12)を通って外部へ放出するが、その途中
でカウリング内空間(13)部分と共鳴することによっ
て消音効果が得られる。
On the other hand, also in the aforementioned Utility Model Publication No. 51-27506,
The purpose is the sound absorption effect of the intake passage wall,
Even if it is effective against high frequency noise, it is not possible to obtain a sufficient silencing effect against low frequency noise. Further, FIG. 12 shows a muffler model when the entire cowling disclosed in Japanese Utility Model Publication No. 52-27506 is viewed as one muffler. In this figure, (11) is the engine carburetor, (12) is the intake passage formed in the cowling wall, and (13) is the space inside the cowling, where air is generated from the intake port of the carburetor (11). The intake noise is emitted from the carburetor (11) to the outside through the intake passage (12), but along the way it resonates with the cowling inner space (13), thereby producing a muffling effect.

即ち、この実公昭51−27506号公報のカウリング
を1つの消音器として見た場合には、これは共鳴車形消
音器ということになるのであって、かかる共鳴形消音器
は、ある一定周波数域の騒音に対しては非常に秀れた消
音効果を示すが、その領域が狭いという欠点があり、周
波数域が特定の一範囲に限定されない船外機エンジンに
は適さないという欠点がある。
In other words, when the cowling disclosed in Japanese Utility Model Publication No. 51-27506 is viewed as a muffler, it is a resonant wheel type muffler, and such a resonant muffler operates only in a certain frequency range. However, it has the disadvantage that the area is narrow, making it unsuitable for outboard motor engines whose frequency range is not limited to one specific range.

なお、第11図の従来形カウリング全体を消音器として
みた場合のモデル消音器構造を第13図に示す。
Incidentally, FIG. 13 shows a model silencer structure in which the entire conventional cowling shown in FIG. 11 is viewed as a silencer.

即ち、本発明は、吸気音成分である低周波騒音に対して
消音効果の秀れたカウリング構造を提供することを目的
としてなされたものである。
That is, the present invention has been made for the purpose of providing a cowling structure that has an excellent muffling effect on low-frequency noise that is an intake sound component.

問題点を解決するための手段 このような目的を達成するため、この発明では、第1図
において、カウリング(4)全体を、膨脹形消音器に見
立てて、機関(3)の吸気管(8)を、第8図膨張形モ
デル消音器の入口管(21)とし、トップカウリング(
4)内の空間(9)を同じく膨脹室(22)とし、更に
、この膨脹室(22)に通ずる尾管(23)に相当して
、吸気導入通路(35)をカウリング(4)内外に連通
して設けたことを特徴とするものである。
Means for Solving the Problems In order to achieve such an object, in the present invention, in FIG. 1, the entire cowling (4) is likened to an inflatable silencer, and the intake pipe (8 ) is the inlet pipe (21) of the expansion model silencer in Figure 8, and the top cowling (
4) The inner space (9) is also an expansion chamber (22), and an intake air introduction passage (35) is connected to the inside and outside of the cowling (4), corresponding to the tail pipe (23) leading to the expansion chamber (22). It is characterized by being provided in communication with each other.

このような膨脹形消音器構造と前記第12図の共鳴形消
音器構造との相違は、入口管(21)の出口端(21a
 )と尾管(23)の入口端(23a)との距離がどれ
だけ離れているかによって決まり、一般的に、この間の
距離が入口管(21)及び尾管(23)の直径より大き
いときは、膨脹形消音器として機能する。また、第13
図との相違は、入口管(21)の反対側の膨脹室端部か
ら尾管(23)入口端(23a)までの距離lCと、該
尾管(23)の長さLo によって決まり、これらを充
分長くすることによって低周波域で高減衰のある膨脹形
消音器となる。
The difference between such an expansion type muffler structure and the resonant type muffler structure shown in FIG. 12 is that the outlet end (21a) of the inlet pipe (21)
) and the inlet end (23a) of the tail pipe (23), and generally, when the distance between them is larger than the diameters of the inlet pipe (21) and the tail pipe (23), , which functions as an inflatable silencer. Also, the 13th
The difference from the figure is determined by the distance 1C from the end of the expansion chamber on the opposite side of the inlet pipe (21) to the inlet end (23a) of the tail pipe (23), and the length Lo of the tail pipe (23). By making it sufficiently long, it becomes an expansion type muffler with high attenuation in the low frequency range.

実施例1 第1図〜第4図において、アッパカウリング(6)には
、その中央部よりやや後方位置において、後部を開放し
た凹部(31)が形成され、この凹部(31)内には、
上方へ突出する吸気取入れ口(7)が形成されるととも
に、この吸気取入れ口(7)部分は、上記凹部(31)
を覆う蓋板(32)によって、その上方部分が覆われて
いる。(33)は、蓋板(32)の下面両側より下方へ
突出した一対のボルト用のボスであり、これらのボス(
33)には、アッパカウリング(6)の裏面側より差し
込んだボルト(図示せず)を導入させて、アッパカウリ
ング(6)へ固着され、前記凹部(31)の後方開口部
より前方へ向けて入った吸気は、更に、吸気取入れ口(
7)孝り下方に向けてアッパカウリング(6)内へ入り
込むようにしている。
Embodiment 1 In FIGS. 1 to 4, a recess (31) with an open rear part is formed in the upper cowling (6) at a position slightly rearward from the center thereof, and inside this recess (31),
An air intake port (7) is formed that projects upward, and this air intake port (7) portion is connected to the recessed portion (31).
Its upper part is covered by a cover plate (32) that covers the. (33) are bosses for a pair of bolts that protrude downward from both sides of the lower surface of the cover plate (32), and these bosses (
33) is fixed to the upper cowling (6) by introducing a bolt (not shown) inserted from the back side of the upper cowling (6), and extending forward from the rear opening of the recess (31). The intake air that has entered is further passed through the intake air intake (
7) It is designed to go downward into the upper cowling (6).

このアッパカウリング(6)の裏面には、1つの天井板
(34)が、上記吸気取入れ口(7)部分より前部側の
範囲を全て覆うようにして張り付けられて、この部分の
カウリング壁部を2重構造としている。
A ceiling plate (34) is attached to the back side of the upper cowling (6) so as to cover the entire area on the front side of the air intake port (7), and the cowling wall in this area is It has a double structure.

その際、この天井板(34)とアッパカウリング(6)
との間には隙間が形成されて、上記吸気取入れ口(7)
より入った吸気は、この隙間によって構成された吸気導
入通路(35)内へ入るようにしている。
At that time, this ceiling board (34) and upper cowling (6)
A gap is formed between the air intake port (7) and the air intake port (7).
The intake air that has entered the gap enters the intake air introduction passage (35) formed by this gap.

この場合、該天井板(34)の略中央部分には、エンジ
ン(3)の緊急始動用プーリ (36)が突出しており
、従って、このプーリ (36)部分を囲むようにして
、天井板(34)を上方へ凹入させ、この凹入部(37
)が、アッパカウリング(6)裏面へ密着されている。
In this case, a pulley (36) for emergency starting of the engine (3) protrudes from approximately the center of the ceiling plate (34), and therefore, the ceiling plate (34) surrounds this pulley (36). is recessed upward, and this recessed part (37
) is in close contact with the back surface of the upper cowling (6).

そして、この密着した凹入部(37)より前部側におい
て、その中央部とその左右両側に計3個の吸気出口(3
8)が形成され、この吸気出口(38)より出た吸気が
、その下方の前記吸気管(8)へ吸い込まれるようにし
である。
Then, on the front side of this closely-contact recessed part (37), a total of three intake outlets (3
8) is formed so that the intake air exiting from this intake outlet (38) is sucked into the intake pipe (8) below.

上記構成において、上記吸気取入れ口(7)より入った
吸気は、アッパカウリング(6)と天井板(34)間の
隙間より左右方向へ出た後、前記凹入部(37)両側を
通って各出口(38)  (38)  (38)より吸
気管(8) (81側へ排出される。他方、吸気管(8
1(81より出た吸気音は、一旦トツブカウリング(4
)の空間(9)へ放出された後、吸気導入通路(35)
を通って外部へ出るが、これら全体が低周波域で高減衰
を有する膨脹形消音器を構成していることから低周波騒
音についても充分消音されることになる。
In the above configuration, the intake air entering from the intake port (7) exits in the left-right direction through the gap between the upper cowling (6) and the ceiling plate (34), and then passes through both sides of the recessed portion (37) to each side. It is discharged from the outlet (38) (38) (38) to the intake pipe (8) (81 side. On the other hand, the intake pipe (8)
1 (the intake noise coming from 81 is caused by the Totsubu cowling (4
) is discharged into the space (9) of the air intake passage (35).
However, since the entire structure constitutes an expansion type muffler with high attenuation in the low frequency range, low frequency noise is also sufficiently muffled.

実施例2 第5図及び第6図は、本発明の他の実施例を示しており
、この実施例では、吸気導入通路(35)の長さを延長
するため天井板(34)の前端部から垂直板(41)を
垂設して、この垂直板(41)とトップカウリング(4
)の前壁との間にも導入通路(35)を形成するように
している。
Embodiment 2 FIGS. 5 and 6 show another embodiment of the present invention. In this embodiment, the front end of the ceiling plate (34) is A vertical plate (41) is hung from the top cowling (41), and this vertical plate (41) and the top cowling (4
) is also formed with an introduction passageway (35).

実施例3 第7図及び第8図は、本発明の第3の実施例を示してお
り、この実施例では、天井板(34)の前端より下方に
向けてゴムパイプ等の延長管(42)を垂設し、これに
よって導入通路(35)を延長したものを示している。
Embodiment 3 FIGS. 7 and 8 show a third embodiment of the present invention. In this embodiment, an extension pipe (42) such as a rubber pipe is connected downward from the front end of the ceiling plate (34). is vertically installed, thereby extending the introduction passageway (35).

なお、上記各実施例を通じて、吸気導入通路(35)内
に吸音材を貼り付けてもよく、このようにすると、高周
波騒音の騒音レベルをより低減することができる。
In each of the embodiments described above, a sound absorbing material may be attached inside the intake air introduction passage (35), and in this way, the noise level of high frequency noise can be further reduced.

更に、他の実施例として、吸気導入通路(35)をトッ
プカウリング(4)の側壁部に設けることも考えられる
Furthermore, as another embodiment, it is also conceivable to provide the intake air introduction passage (35) in the side wall portion of the top cowling (4).

騒音測定の結果 第9図は、第5図本発明カウリングと第11図従来形カ
ウリングの周波数毎の騒音低減効果を測定したものであ
って、この図で解るように、特に300Hz以下の周波
数域において、本発明トップカウリングの方が騒音低減
効果が遥かに大きいことが解る。
Noise measurement results Figure 9 shows the noise reduction effect measured at each frequency for the inventive cowling in Figure 5 and the conventional cowling in Figure 11. It can be seen that the top cowling of the present invention has a much greater noise reduction effect.

また、第10図は、同じく第5図の本発明トップカウリ
ングと第11図のトップカウリング構造の場合を比較し
て示す回転数毎の騒音レベルを示したものであって、こ
れで解るように、本発明の方が騒音レベルが減少してい
ることが解る。なお、この図において、各横線間の長さ
が5dBに相当するよう表示している。
Moreover, FIG. 10 shows the noise level at each rotation speed, comparing the top cowling structure of the present invention shown in FIG. 5 with the top cowling structure shown in FIG. 11. , it can be seen that the noise level is reduced with the present invention. In this figure, the length between each horizontal line is shown to correspond to 5 dB.

発明の効果 以上の如く、本発明によれば、カウリング全体を低周波
域に高減衰を有する膨脹形消音器に構成しているから、
このような膨脹形消音器の長所である低周波騒音に対し
ても充分な消音効果を得ることができ、それ故、このよ
うな低周波騒音の大きいディーゼル機関に特に有効なカ
ウリング構造を得ることができて、騒音の低いディーゼ
ル船外機を得ることができるという効果がある。
Effects of the Invention As described above, according to the present invention, since the entire cowling is configured as an expansion type muffler having high attenuation in the low frequency range,
An advantage of such an expansion type silencer is that it can obtain a sufficient silencing effect even against low-frequency noise, and therefore, a cowling structure that is particularly effective for diesel engines with such large low-frequency noise can be obtained. This has the effect of making it possible to obtain a diesel outboard motor with low noise.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は、本発明船外機におけるトップカウリング部分
の一部縦断側面図、第2図はトップカウリングの要部拡
大縦断面図、第3図は同じくトップカウリング部分の一
部横断平面図、第4図は、トップカウリングにおける吸
気取り入れ部分の分解斜視図、第5図は、本発明の別の
実施例を示す要部縦断側面図、第6図は、同じ(トップ
カウリ 。 ングの一部横断平面図、第7図は、本発明の更に他の実
施例を示すトップカウリング部分゛の一部縦断側面図、
第8図は、本発明トップカウリングの全体をモデル消音
器として見た場合の模式図、第9図は、周波数毎の騒音
低減効果を示すグラフ、第10図は、機関回転数毎の騒
音レベルを示すグ ′ラフ、第11図は、従来形トップ
カウリング構造を示す船外機の一部縦断側面図、第12
図は、トップカウリングを二重壁とした従来例において
、そのトップカウリング全体をモデル消音器として見た
場合の模式図、第13図は、第11図のトップカウリン
グをモデル消音器として見た場合の模式図である。 (4)−・トップカウリング、(81−吸気管、(9)
−・カウリング内空間、(21) −入口管、(22)
・−・膨脹室、(23) −尾管、(35) −吸気導
入通路。 特許 出願人 ヤンマーディーゼル株式会社代理人弁理
士 樽   本   久   幸第10図 貰゛藺回転trprrb
FIG. 1 is a partially longitudinal sectional side view of the top cowling portion of the outboard motor of the present invention, FIG. 2 is an enlarged longitudinal sectional view of the main part of the top cowling, and FIG. 3 is a partially sectional plan view of the top cowling portion. Fig. 4 is an exploded perspective view of the intake portion of the top cowling, Fig. 5 is a longitudinal sectional side view of the main part showing another embodiment of the present invention, and Fig. 6 is the same (part of the top cowling). FIG. 7 is a partially vertical side view of the top cowling portion showing still another embodiment of the present invention;
Figure 8 is a schematic diagram of the entire top cowling of the present invention viewed as a model silencer, Figure 9 is a graph showing the noise reduction effect for each frequency, and Figure 10 is the noise level for each engine speed. Figure 11 is a graph showing the conventional top cowling structure, and Figure 12 is a partially longitudinal side view of the outboard motor showing the conventional top cowling structure.
The figure is a schematic diagram of a conventional example with a double-walled top cowling, when the entire top cowling is viewed as a model silencer, and Figure 13 is a diagram when the top cowling of Figure 11 is viewed as a model silencer. FIG. (4)-Top cowling, (81-Intake pipe, (9)
- Cowling inner space, (21) - Inlet pipe, (22)
--- Expansion chamber, (23) -tail pipe, (35) -intake introduction passage. Patent Applicant Yanmar Diesel Co., Ltd. Representative Patent Attorney Hisayuki Tarumoto Figure 10

Claims (1)

【特許請求の範囲】[Claims] トップカウリング全体を該カウリング内の機関吸気管を
入口管とし、同じくカウリング内の空間を膨脹室とする
膨脹形消音器と見なして、該消音器の尾管に相当する吸
気導入通路をカウリング内外に連通して設けたことを特
徴とする船外機のトップカウリング。
Considering the entire top cowling as an expansion type silencer with the engine intake pipe inside the cowling as the inlet pipe and the space inside the cowling as the expansion chamber, an intake air introduction passage corresponding to the tail pipe of the silencer is installed inside and outside the cowling. The top cowling of an outboard motor is characterized by its continuous arrangement.
JP15189184A 1984-07-20 1984-07-20 Top cowling for outboard engine Pending JPS6130493A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15189184A JPS6130493A (en) 1984-07-20 1984-07-20 Top cowling for outboard engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15189184A JPS6130493A (en) 1984-07-20 1984-07-20 Top cowling for outboard engine

Publications (1)

Publication Number Publication Date
JPS6130493A true JPS6130493A (en) 1986-02-12

Family

ID=15528457

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15189184A Pending JPS6130493A (en) 1984-07-20 1984-07-20 Top cowling for outboard engine

Country Status (1)

Country Link
JP (1) JPS6130493A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4952180A (en) * 1988-04-21 1990-08-28 Sanshin Kogyo Kabushiki Kaisha Cowling for outboard motor
JPH02254095A (en) * 1989-03-25 1990-10-12 Sanshin Ind Co Ltd Cowling structure for outboard engine
US6796859B1 (en) * 2000-11-16 2004-09-28 Bombardier Recreational Products Inc. Air intake silencer

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58194693A (en) * 1982-05-07 1983-11-12 Yamaha Motor Co Ltd Intake device of outboard engine

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58194693A (en) * 1982-05-07 1983-11-12 Yamaha Motor Co Ltd Intake device of outboard engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4952180A (en) * 1988-04-21 1990-08-28 Sanshin Kogyo Kabushiki Kaisha Cowling for outboard motor
JPH02254095A (en) * 1989-03-25 1990-10-12 Sanshin Ind Co Ltd Cowling structure for outboard engine
US6796859B1 (en) * 2000-11-16 2004-09-28 Bombardier Recreational Products Inc. Air intake silencer

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