JPH0251041B2 - - Google Patents
Info
- Publication number
- JPH0251041B2 JPH0251041B2 JP58016165A JP1616583A JPH0251041B2 JP H0251041 B2 JPH0251041 B2 JP H0251041B2 JP 58016165 A JP58016165 A JP 58016165A JP 1616583 A JP1616583 A JP 1616583A JP H0251041 B2 JPH0251041 B2 JP H0251041B2
- Authority
- JP
- Japan
- Prior art keywords
- exhaust pipe
- exhaust
- engine
- casing
- water
- 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 - Lifetime
Links
- 239000002351 wastewater Substances 0.000 claims description 12
- 238000001816 cooling Methods 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 15
- 230000010349 pulsation Effects 0.000 description 7
- 238000013021 overheating Methods 0.000 description 4
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000003657 drainage water Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000000498 cooling water Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N13/00—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00
- F01N13/12—Exhaust or silencing apparatus characterised by constructional features ; Exhaust or silencing apparatus, or parts thereof, having pertinent characteristics not provided for in, or of interest apart from, groups F01N1/00 - F01N5/00, F01N9/00, F01N11/00 specially adapted for submerged exhausting
-
- 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は船外機の排気装置に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to an exhaust system for an outboard motor.
［従来の技術］
船外機の排気装置として、エンジンに接続され
る排気管をケーシング内に垂設し、エンジン冷却
後の排水を排気管まわりに吐出させ、排気熱によ
る排気管ひいてはケーシングの過熱を防止し、ケ
ーシングの塩付き、塗装の剥離による腐蝕の発生
防止を図るものがある。ただし、このような排気
装置においては、ケーシング内の排気管まわりに
吐出された排水が、その落下中あるいは排気管の
外面に伝わつてその開口に至つた時に、排気管内
の排気脈動によつて排気管内に吸い込まれること
があり、その水滴がエンジンのシリンダ内にまで
至つて失火の原因となつたり、船外機を海で使用
する場合には排気通路に塩分が付着して腐蝕ある
いは通路抵抗増大ひいては通路閉塞を生ずるおそ
れがある。[Prior art] As an exhaust system for an outboard motor, an exhaust pipe connected to the engine is installed vertically inside a casing, and after engine cooling, waste water is discharged around the exhaust pipe, thereby preventing overheating of the exhaust pipe and the casing due to exhaust heat. Some products are designed to prevent salt buildup on the casing and corrosion caused by peeling off the paint. However, in such an exhaust system, when the waste water discharged around the exhaust pipe inside the casing falls or is transmitted to the outer surface of the exhaust pipe and reaches its opening, the exhaust pulsation inside the exhaust pipe causes the waste water to be exhausted. Water droplets may get sucked into the pipes and reach the engine cylinders, causing misfires.When using an outboard motor at sea, salt may adhere to the exhaust passage, causing corrosion or increased passage resistance. As a result, there is a risk that the passageway will be blocked.
そこで、本出人願は、上記船外機の排気装置と
して、昭和51年第172785号実用新案出願（実開昭
53−88996号）に添付した明細書および図面によ
つて、「排気管の下端部に、斜め下向きに外方へ
突出する傾斜状外面を設けた排気装置」をすでに
提案している。 Therefore, the applicant's application is based on utility model application No. 172785 of 1975 (Utility Model Application No. 172785) as an exhaust system for the above outboard motor.
No. 53-88996), they have already proposed an ``exhaust device in which a lower end of an exhaust pipe is provided with an inclined outer surface that projects diagonally downward and outward.''
上記すでに提案している排気装置は、排気管の
外面に伝わつて流下する排水を、傾斜状外面に沿
つて、排気管の開口から離れた位置に案内した
後、傾斜状外面の外縁部から落下せしめるように
し、排水に対する排気脈動の影響を排除し、排気
管内への排水の吸い込みを防止可能としている。 The above-mentioned already proposed exhaust system guides the drainage water flowing down along the outer surface of the exhaust pipe along the sloping outer surface to a position away from the opening of the exhaust pipe, and then falls from the outer edge of the slanted outer surface. This eliminates the influence of exhaust pulsation on drainage and prevents drainage from being sucked into the exhaust pipe.
［発明が解決しようとする課題］
しかしながら、上記すでに提案している排気装
置にあつては、排気管の傾斜状外面から離間する
時点および離間直後の排水の移動速度が比較的小
さいものであることから、そのような排水に対す
る排気脈動の影響を全面的に排除することができ
ず、排水の排気管内への吸い込みを確実に防止す
るのに困難がある。[Problems to be Solved by the Invention] However, in the exhaust system already proposed above, the movement speed of the waste water at the time of separation from the inclined outer surface of the exhaust pipe and immediately after separation is relatively small. Therefore, it is not possible to completely eliminate the influence of exhaust pulsation on such drainage, and it is difficult to reliably prevent drainage from being sucked into the exhaust pipe.
本発明は、エンジン冷却後の排水を排気管の上
端側外面に吐出させて排気管ひいてはケーシング
の過熱を防止するに際し、該排水の排気管内への
吸い込みを確実に防止することを目的とする。 An object of the present invention is to reliably prevent the waste water from being sucked into the exhaust pipe when the waste water after engine cooling is discharged to the outer surface of the upper end of the exhaust pipe to prevent overheating of the exhaust pipe and thus the casing.
［課題を解決するための手段］
本発明は、エンジンに接続される排気管をケー
シング内に垂設し、エンジン冷却後の排水を排気
管に吐出させる船外機の排気装置において、排気
管の下端部寄り中間部の外面に、下り勾配をなし
ながら外方へ突出する傾斜状流下面を設け、傾斜
状流下面の最も外方へ突出する外縁部は、排気管
が開口する最下端面の外縁部から水平方向と鉛直
方向の両方に離間配置せしめられるようにしたも
のである。[Means for Solving the Problems] The present invention provides an exhaust system for an outboard motor in which an exhaust pipe connected to the engine is installed vertically within a casing, and waste water after cooling the engine is discharged into the exhaust pipe. The outer surface of the middle part near the lower end is provided with a sloped flow surface that projects outward while forming a downward slope. It is arranged so that it can be spaced apart both horizontally and vertically from the outer edge.
［作用］
本発明によれば、下記〜の作用効果があ
る。[Function] According to the present invention, there are the following effects.
排気管の外面に伝わつて流下する排水は、排
気管の開口から水平および鉛直の両方向に離れ
た傾斜状流下面の外縁部から下方空中に落下す
る。 The wastewater flowing down along the outer surface of the exhaust pipe falls into the air below from the outer edge of the inclined downstream surface that is spaced both horizontally and vertically from the opening of the exhaust pipe.
上記で、傾斜状流下面から離れる時点およ
びその直後の水滴は、排気管の開口から水平方
向のみならず、鉛直方向にも離間せしめられて
いる上述の傾斜状流下面の外縁部から離れるも
のであるため、排気脈動の作用を受けることな
く、排気管内に吸い込まれない。 In the above, the water droplets at and immediately after leaving the slanted flow surface are separated from the outer edge of the slanted flow surface, which is spaced not only horizontally but also vertically from the opening of the exhaust pipe. Therefore, it is not affected by exhaust pulsation and is not sucked into the exhaust pipe.
そして、上記の如く傾斜状流下面から離れ
て空中落下し、排気管の開口の水平方向の側方
を落下することとなる水滴は、その開口まわり
の最下端面の外縁部から十分離れた落下経路
を、しかもすでに一定の落下距離を経過したこ
とによる大きな落下速度にて落下するものとな
つている。このため、ここにおいても、排気脈
動の作用を受けることなく、排気管内に吸い込
まれない。 As mentioned above, the water droplets that fall in the air away from the sloped flow surface and fall on the horizontal side of the exhaust pipe opening should fall sufficiently away from the outer edge of the lowest end surface around the opening. It falls at a high falling speed due to the fact that it has already passed a certain falling distance. Therefore, here as well, the exhaust gas is not affected by exhaust pulsation and is not sucked into the exhaust pipe.
［実施例］
第１図は本発明の一実施例が適用されてなる船
外機の要部を破断して示す側面図、第２図は第１
図の要部を拡大して示す断面図、第３図は第２図
の―線に沿う断面図である。[Embodiment] Fig. 1 is a side view showing a cutaway main part of an outboard motor to which an embodiment of the present invention is applied, and Fig.
FIG. 3 is a sectional view taken along the line -- in FIG. 2; FIG.
船体の船尾板１１には、クランプブラケツト１
２、スイベルブラケツト１３および連結部材１４
Ａ，１４Ｂを介してケーシング１５が取り付けら
れている。ケーシング１５の上部には水冷エンジ
ン１６が搭載され、エンジン１６の出力は、ケー
シング１５内に垂設されるドライブ軸１７を介し
てプロペラ１８に伝達されている。 A clamp bracket 1 is attached to the stern plate 11 of the hull.
2. Swivel bracket 13 and connecting member 14
A casing 15 is attached via A and 14B. A water-cooled engine 16 is mounted on the upper part of the casing 15, and the output of the engine 16 is transmitted to a propeller 18 via a drive shaft 17 vertically installed within the casing 15.
ケーシング１５の内部には膨張室１９が形成さ
れ、膨張室１９はプロペラ１８の上方に設けられ
る排気口２０を介して水中に連通されている。こ
の膨張室１９の中央には、エンジン１６の排気通
路２１に接続される排気管２２が垂下され、排気
管２２の他端部には開口２３が形成されている。 An expansion chamber 19 is formed inside the casing 15, and the expansion chamber 19 communicates with the water via an exhaust port 20 provided above the propeller 18. An exhaust pipe 22 connected to an exhaust passage 21 of the engine 16 hangs down from the center of the expansion chamber 19, and an opening 23 is formed at the other end of the exhaust pipe 22.
また、ケーシング１５の内部には水ポンプ２４
が配置されている。水ポンプ２４は、ドライブ軸
１７の中間部に固定されているインペラの回転に
よつて、冷却水としての外水を吸水管２５を介し
て汲み上げ、送水管２６を介してエンジン１６の
水ジヤケツトに圧送可能としている。なお、エン
ジン冷却後の排水は、エンジン１６の排水通路２
７からケーシング１５の膨張室１９に排出可能と
されている。 Additionally, a water pump 24 is provided inside the casing 15.
is located. The water pump 24 pumps up outside water as cooling water through a water suction pipe 25 by rotating an impeller fixed to an intermediate portion of the drive shaft 17, and supplies it to the water jacket of the engine 16 through a water supply pipe 26. It can be pumped. In addition, the drainage after cooling the engine is carried out through the drainage passage 2 of the engine 16.
7 into the expansion chamber 19 of the casing 15.
ここで、前記排気管２２の上端部には、上記エ
ンジン１６の排水通路２７に連通する排水孔２８
が設けられ、排気管２２の上端部近傍ないし下端
部近傍の中間部には、排水孔２８から排出せしめ
られる排水を排気管２２の外面に沿つて流下可能
とするように左右一対のリブ２９Ａ，２９Ｂが画
成する排水溝３０が設けられている。 Here, a drain hole 28 is provided at the upper end of the exhaust pipe 22 and communicates with a drain passage 27 of the engine 16.
A pair of left and right ribs 29A are provided at the intermediate portion near the upper end or near the lower end of the exhaust pipe 22 so that the water discharged from the drain hole 28 can flow down along the outer surface of the exhaust pipe 22. A drain 30 defined by 29B is provided.
しかして、排気管２２の下端部近傍の中間部
で、リブ２９Ａ，２９Ｂに挾まれて排水溝３０の
下端部を形成する部分には、斜め下向きに外方す
なわちケーシング１５の内面１５Ａに向けて突出
する傾斜状流下面３１が設けられている。また、
排気管２２の下端部には、上記傾斜状流下面３１
の外縁部より内方においてより下方に延びる外面
３２が設けられている。 Therefore, in the middle part near the lower end of the exhaust pipe 22, in the part sandwiched between the ribs 29A, 29B and forming the lower end of the drain groove 30, there is a diagonally downward direction toward the outside, that is, the inner surface 15A of the casing 15. A protruding sloped flow surface 31 is provided. Also,
At the lower end of the exhaust pipe 22, the inclined flow lower surface 31 is provided.
An outer surface 32 is provided that extends further inwardly and downwardly than the outer edge.
すなわち、傾斜状流下面３１の最も外方へ突出
する外縁部は、排気管２２が開口する最下端面の
外縁部から水平方向と鉛直方向の両方に離間配置
せしめられている。 That is, the outer edge of the inclined lower flow surface 31 that protrudes most outwardly is spaced both horizontally and vertically from the outer edge of the lowermost end surface where the exhaust pipe 22 opens.
次に、上記実施例の作用について説明する。 Next, the operation of the above embodiment will be explained.
エンジン１６を冷却した後に排水通路２７、排
水孔２８を経て排水溝３０に達し、排気管２２の
外面に伝わつて流下する排水は、排水溝３０の下
端部において、傾斜状流下面３１に沿つて排気管
２２の開口２３から水平および鉛直の両方向に離
れた傾斜状流下面３１の外縁部から離間し、下方
空中に落下する。 After the engine 16 has been cooled, the water reaches the drain groove 30 via the drain passage 27 and the drain hole 28, and is transmitted to the outer surface of the exhaust pipe 22 and flows down. It separates from the outer edge of the inclined downstream surface 31, which is spaced both horizontally and vertically from the opening 23 of the exhaust pipe 22, and falls downward into the air.
ここで、傾斜状流下面３１から離れる時点およ
びその直後の水滴は、排気管２２の開口２３から
水平方向のみならず、鉛直方向にも離間せしめら
れている上述の傾斜状流下面３１の外縁部から離
れるものであるため、排気脈動の作用を受けるこ
となく、排気管２２内に吸い込まれない。 Here, the water droplets at the time when they leave the inclined downward flow surface 31 and immediately after that point are separated from the opening 23 of the exhaust pipe 22 not only in the horizontal direction but also in the vertical direction. Since the air is separated from the air, it is not affected by exhaust pulsation and is not sucked into the exhaust pipe 22.
そして、上記の如く傾斜状流下面３１から離れ
て空中落下し、排気管２２の開口２３の水平方向
の側方を落下することとなる水滴は、その開口２
３まわりの最下端面の外縁部から十分離れた落下
経路を、しかもすでに一定の落下距離を経過した
ことによる大きな落下速度にて落下するものとな
つている。このため、ここにおいても、排気脈動
の作用を受けることなく、排気管２２内に吸い込
まれない。 As described above, water droplets that leave the inclined flow down surface 31 and fall in the air and fall on the horizontal side of the opening 23 of the exhaust pipe 22 are removed from the opening 23.
The object falls along a falling path sufficiently far away from the outer edge of the lowermost end surface around the object 3, and at a high falling speed because it has already passed a certain falling distance. Therefore, here as well, the exhaust gas is not affected by exhaust pulsation and is not sucked into the exhaust pipe 22.
また、傾斜状流下面３１から落下する排水は、
傾斜状流下面３１の傾斜方向に飛散してケーシン
グ１５の内面１５Ａに達し、その内面１５Ａに沿
つて流下した後、排気とともに排気口２０から外
部に排出される。 In addition, the drainage water falling from the inclined flow down surface 31 is
It scatters in the direction of inclination of the inclined downstream surface 31, reaches the inner surface 15A of the casing 15, flows down along the inner surface 15A, and is then discharged to the outside from the exhaust port 20 along with the exhaust gas.
すなわち、上記実施例によれば、エンジン冷却
後の排水は、排気管２２の内部に吸い込まれるこ
となく、排気管２２の外面およびケーシング１５
の内面１５Ａに沿つて流下し、ケーシング１５の
排気熱による過熱を有効に防止することが可能と
なる。 That is, according to the embodiment described above, the waste water after cooling the engine is not sucked into the exhaust pipe 22, but flows onto the outer surface of the exhaust pipe 22 and the casing 15.
The exhaust gas flows down along the inner surface 15A of the casing 15, making it possible to effectively prevent overheating of the casing 15 due to exhaust heat.
［発明の効果］
以上のように本発明によれば、エンジン冷却後
の排水を排気管の上端側外面に吐出させて排気管
ひいてはケーシングの過熱を防止するに際し、該
排水の排気管内への吸い込みを確実に防止するこ
とができる。[Effects of the Invention] As described above, according to the present invention, when discharging wastewater after cooling the engine to the outer surface of the upper end of the exhaust pipe to prevent overheating of the exhaust pipe and eventually the casing, the wastewater is not sucked into the exhaust pipe. can be reliably prevented.
第１図は本発明の一実施例が適用されてなる船
外機の要部を破断して示す側面図、第２図は第１
図の要部を拡大して示す断面図、第３図は第２図
の―線に沿う断面図である。
１５……ケーシング、１６……エンジン、２２
……排気管、２４……水ポンプ、３０……排水
溝、３１……傾斜状流下面、３２……外面。
FIG. 1 is a cutaway side view showing the main parts of an outboard motor to which an embodiment of the present invention is applied, and FIG.
FIG. 3 is a sectional view taken along the line ``--'' in FIG. 2; FIG. 15...Casing, 16...Engine, 22
... Exhaust pipe, 24 ... Water pump, 30 ... Drainage groove, 31 ... Inclined flow down surface, 32 ... External surface.
Claims (1)
に垂設し、エンジン冷却後の排水を排気管に吐出
させる船外機の排気装置において、排気管の下端
部寄り中間部の外面に、下り勾配をなしながら外
方へ突出する傾斜状流下面を設け、傾斜状流下面
の最も外方へ突出する外縁部は、排気管が開口す
る最下端面の外縁部から水平方向と鉛直方向の両
方に離間配置せしめられていることを特徴とする
船外機の排気装置。1. In an exhaust system for an outboard motor, in which the exhaust pipe connected to the engine is installed vertically inside the casing, and the waste water after cooling the engine is discharged into the exhaust pipe, a downward slope is formed on the outer surface of the middle part near the lower end of the exhaust pipe. An slanted lower flow surface is provided that protrudes outward, and the outermost edge of the slanted lower flow surface is spaced both horizontally and vertically from the outer edge of the lowest end surface where the exhaust pipe opens. An exhaust system for an outboard motor, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58016165A JPS59145322A (en) | 1983-02-04 | 1983-02-04 | Exhaust device for outboard engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58016165A JPS59145322A (en) | 1983-02-04 | 1983-02-04 | Exhaust device for outboard engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59145322A JPS59145322A (en) | 1984-08-20 |
| JPH0251041B2 true JPH0251041B2 (en) | 1990-11-06 |
Family
ID=11908890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58016165A Granted JPS59145322A (en) | 1983-02-04 | 1983-02-04 | Exhaust device for outboard engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59145322A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0570838U (en) * | 1992-02-29 | 1993-09-24 | ユキワ精工株式会社 | Index table |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0329531Y2 (en) * | 1985-12-12 | 1991-06-24 |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55139920A (en) * | 1979-04-17 | 1980-11-01 | Yamaha Motor Co Ltd | Exhaust device for outside engine of boat |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5913200Y2 (en) * | 1976-12-22 | 1984-04-19 | 三信工業株式会社 | Exhaust system for outboard motors |
-
1983
- 1983-02-04 JP JP58016165A patent/JPS59145322A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55139920A (en) * | 1979-04-17 | 1980-11-01 | Yamaha Motor Co Ltd | Exhaust device for outside engine of boat |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0570838U (en) * | 1992-02-29 | 1993-09-24 | ユキワ精工株式会社 | Index table |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59145322A (en) | 1984-08-20 |
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