JPS62255516A - Exhaust device for outboard motor - Google Patents
Exhaust device for outboard motorInfo
- Publication number
- JPS62255516A JPS62255516A JP61100359A JP10035986A JPS62255516A JP S62255516 A JPS62255516 A JP S62255516A JP 61100359 A JP61100359 A JP 61100359A JP 10035986 A JP10035986 A JP 10035986A JP S62255516 A JPS62255516 A JP S62255516A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust
- engine
- water
- wall surface
- outboard motor
- 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.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 230000001154 acute effect Effects 0.000 claims abstract description 6
- 230000010349 pulsation Effects 0.000 abstract description 5
- 238000011144 upstream manufacturing Methods 0.000 abstract description 3
- 239000013535 sea water Substances 0.000 description 8
- 230000000694 effects Effects 0.000 description 5
- 230000002411 adverse Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
Landscapes
- Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Abstract
Description
【発明の詳細な説明】 〔発明の目的〕 （産業上の利用分野） この発明は船外機の排気装置に関する。[Detailed description of the invention] [Purpose of the invention] (Industrial application field) This invention relates to an exhaust system for an outboard motor.
（従来の技術）
船外機は、第４図に一例を示すように、ドライブシャフ
トハウジング１の上部にエンジン２が搭載され、このエ
ンジン２からの排気系は同図に示すように排気流が層流
になるように極力滑らかな、かつ断面変化が少ない形状
に形成されている。(Prior Art) As an example of an outboard motor is shown in Fig. 4, an engine 2 is mounted on the upper part of a drive shaft housing 1, and an exhaust system from this engine 2 has an exhaust flow as shown in Fig. 4. It is formed in a shape that is as smooth as possible to create laminar flow and with little cross-sectional change.
すなわち、図中符号３はエンジン２からエキゾーストチ
ューブ部分であり、４はドライブシトフ【・ハウジング
ＩＪ３よびギヤケース５内の排気通路であって、これら
を通じて排出される排気はプロペラ６部分から水中に排
出されるようになされている。That is, the reference numeral 3 in the figure is the exhaust tube part from the engine 2, and 4 is the exhaust passage in the drive shift housing IJ3 and gear case 5, and the exhaust gas discharged through these is discharged into the water from the propeller 6 part. It is designed so that
（１明が解決しようとする問題点）
しかるに上記船外機の排気系の描込では、排気圧力が脈
動流であるため海水等が排気通路の内壁面を伝わって逆
流することがしばしば起る。このように海水が逆流入す
ると、エンジン２を傷め、エンジンの耐久性や信頼性を
損・うどともにエンジン性能を低下さけ、また海水の場
合には海水中の塩分が固化して種々の弊害をもたらすと
いう問題があった。(The problem that 1 Mei is trying to solve) However, in drawing the exhaust system of the outboard motor mentioned above, because the exhaust pressure is a pulsating flow, it often happens that seawater, etc. flows backward through the inner wall surface of the exhaust passage. . If seawater flows backward in this way, it will damage the engine 2, impair the durability and reliability of the engine, and reduce engine performance.In addition, in the case of seawater, the salt in the seawater will solidify, causing various adverse effects. There was a problem with bringing it.
この発明は上記従来技術の問題点に着目し、これを改善
することを目的とするもので、排気の脈動によるエンジ
ン内部への水の逆流侵入を確実に防止し、エンジンに与
える影響を皆無とすることのできる船外ｄの排気装買を
提供するものである。This invention focuses on the above-mentioned problems of the prior art and aims to improve them by reliably preventing the backflow of water into the engine due to exhaust pulsation and eliminating any effects on the engine. The purpose is to provide an outboard exhaust system that can be used.
（問題点を解決するための手段）
この発明は、上記従来技術の問題点を解決するため、船
外機の排気系を構成する排気管路の内壁面にこの内壁面
に対し鋭角な断面を有する環状の段部を周設したことを
特徴とするものである。(Means for Solving the Problems) In order to solve the above-mentioned problems of the prior art, the present invention provides an inner wall surface of an exhaust pipe constituting an exhaust system of an outboard motor with a cross section that is at an acute angle with respect to the inner wall surface. It is characterized by having an annular stepped portion provided around the periphery.
（作用）
上記のように構成したことにより、排気圧力の脈動によ
り海水等が逆流入して排気管路の内壁面を伝わって侵入
しても、排気管路の内壁面に周設され、この内壁面に対
し鋭角をなす断面を有する形状の段部によって内壁面を
伝わって流入する水を遮断し、流入水がエンジンに到達
することが阻止されてエンジンに悪影響を及ぼすことが
防止される。(Function) With the above configuration, even if seawater or the like flows back in due to pulsation of exhaust pressure and invades along the inner wall surface of the exhaust pipe, it will not be able to penetrate the inner wall of the exhaust pipe. The stepped portion having a cross section that forms an acute angle with respect to the inner wall surface blocks water flowing along the inner wall surface, thereby preventing the inflow water from reaching the engine and thereby preventing it from having an adverse effect on the engine.
（実施例） 以下、この発明を第１図ないし第３図により説明する。(Example) This invention will be explained below with reference to FIGS. 1 to 3.
第１藺は排気管路の一部としてのエキゾーストチューブ
７部分を例示しており、このエキゾーストデユープ７の
内壁面７ａに２つの段部８，９を設けた場合を示してい
る。The first diagram exemplifies the exhaust tube 7 portion as a part of the exhaust pipe line, and shows a case in which two step portions 8 and 9 are provided on the inner wall surface 7a of the exhaust dup 7.
図において上部に示す段部８は、内壁面７ａにリブ状の
断面略Ｖ字形の突条８ａを形成し、この突条８ａの下向
きの而８ｂで段部８を形成している。The stepped portion 8 shown in the upper part of the figure has a rib-like protrusion 8a having a substantially V-shaped cross section formed on the inner wall surface 7a, and the stepped portion 8 is formed by a downward extension 8b of the protrusion 8a.
図において下部に示す段部９は、内壁面７ａに断面略Ｖ
字形の溝９８を形成し、この溝９ａの下向きの面９ｂで
段部９を形成している。The step portion 9 shown at the bottom in the figure has a cross section of approximately V on the inner wall surface 7a.
A groove 98 in the shape of a letter is formed, and a step portion 9 is formed at a downward facing surface 9b of the groove 9a.
したがって、排気圧力の脈動によって水（海水）が逆流
し、内壁面７ａを伝わって進入しても、前記段部８また
は９によりそれ以上上流側へ流入することが阻止され、
エンジン２にまで到達することが防がれる。Therefore, even if water (seawater) flows backward due to the pulsation of the exhaust pressure and enters through the inner wall surface 7a, the stepped portion 8 or 9 prevents it from flowing further upstream.
It is prevented from reaching engine 2.
上記段部はエキゾーストチューブ７以外の排気管路に設
けるようにしてもよい。The step portion may be provided in an exhaust pipe other than the exhaust tube 7.
以上のようにこの発明は、ドライブシャフトハウジング
の上部にエンジンが搭載され、エキゾーストチューブか
らドライブシャフトハウジング内の排気通路を通じ下部
から水中に排気する排気系を有する船外救において、前
記排気系を構成する排気管路の内壁面にこの内壁面に対
し鋭角な断面を有する環状の段部を周設したので、エン
ジンの排気脈動により排気管路内の水が逆流入しても、
段部によりそれ以上上流方向へ流れることが阻止され、
これによりエンジンに水が侵入することが確実に防止さ
れてエンジンの耐久性を向上することができると同時に
エンジン性能を高めることができ、海水の場合には海水
中の塩分が固着することを防ぐことができるなどの種々
の効果がある。As described above, the present invention provides an overboard rescue system in which an engine is mounted on the upper part of a drive shaft housing and has an exhaust system that exhausts from the lower part into the water from the exhaust tube through the exhaust passage in the drive shaft housing. Since an annular stepped portion having an acute cross section with respect to the inner wall surface of the exhaust pipe is provided around the inner wall of the exhaust pipe, even if water in the exhaust pipe flows back in due to exhaust pulsation of the engine,
The stepped portion prevents the fluid from flowing further upstream,
This reliably prevents water from entering the engine, improving the durability of the engine, and at the same time increasing engine performance, and in the case of seawater, prevents salt in the seawater from sticking. It has various effects such as:
第１図はこの発明における排気管路の一部としてのエキ
ゾーストチューブを示す縦断面図、第２図は第１図の８
部の拡大図、第３図は同９部の拡大図、第４図は従来の
船外殿の排気系を示す説明図である。
１・・・ドライブシャフトハウジング、２・・・エンジ
ン、６・・・プロペラ、７・・・エキゾーストチューブ
、８．９・・・段部、８ａ・・・突条、９ａ・・・溝、
８ｂ、９ｂ・・・面。
出願人代理人 波 多 野 久第 １ 区
第２図
第 ３ 開FIG. 1 is a longitudinal cross-sectional view showing an exhaust tube as a part of the exhaust pipe line in this invention, and FIG.
FIG. 3 is an enlarged view of the ninth section, and FIG. 4 is an explanatory diagram showing a conventional exhaust system for an outboard cabin. DESCRIPTION OF SYMBOLS 1... Drive shaft housing, 2... Engine, 6... Propeller, 7... Exhaust tube, 8.9... Step part, 8a... Projection, 9a... Groove,
8b, 9b... sides. Applicant's agent Hisashi Hatano Ward 1, Figure 2, Section 3
Claims (1)
れ、エキゾーストチューブからドライブシャフトハウジ
ング内の排気通路を通じ下部から水中に排気する排気系
を有する船外機において、前記排気系を構成する排気管
路の内壁面にこの内壁面に対し鋭角な断面を有する環状
の段部を周設したことを特徴とする船外機の排気装置。In an outboard motor in which the engine is mounted on the upper part of the drive shaft housing and has an exhaust system that exhausts from the exhaust tube into the water from the lower part through the exhaust passage in the drive shaft housing, the inner wall surface of the exhaust pipe constituting the exhaust system An exhaust system for an outboard motor, characterized in that an annular stepped portion having an acute cross section with respect to the inner wall surface is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61100359A JPH07113325B2 (en) | 1986-04-30 | 1986-04-30 | Outboard motor exhaust system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61100359A JPH07113325B2 (en) | 1986-04-30 | 1986-04-30 | Outboard motor exhaust system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62255516A true JPS62255516A (en) | 1987-11-07 |
| JPH07113325B2 JPH07113325B2 (en) | 1995-12-06 |
Family
ID=14271884
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61100359A Expired - Lifetime JPH07113325B2 (en) | 1986-04-30 | 1986-04-30 | Outboard motor exhaust system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07113325B2 (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419013A (en) * | 1977-07-12 | 1979-02-13 | Yamaha Motor Co Ltd | Marine engine exhaust equipment |
-
1986
- 1986-04-30 JP JP61100359A patent/JPH07113325B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5419013A (en) * | 1977-07-12 | 1979-02-13 | Yamaha Motor Co Ltd | Marine engine exhaust equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07113325B2 (en) | 1995-12-06 |
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