JPH0633061B2 - Multi-cylinder internal combustion engine for motorcycles - Google Patents
Multi-cylinder internal combustion engine for motorcyclesInfo
- Publication number
- JPH0633061B2 JPH0633061B2 JP3045681A JP4568191A JPH0633061B2 JP H0633061 B2 JPH0633061 B2 JP H0633061B2 JP 3045681 A JP3045681 A JP 3045681A JP 4568191 A JP4568191 A JP 4568191A JP H0633061 B2 JPH0633061 B2 JP H0633061B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- rear cylinder
- internal combustion
- intake
- combustion engine
- 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
- 238000002485 combustion reaction Methods 0.000 title claims description 11
- 230000000694 effects Effects 0.000 description 3
- 239000002828 fuel tank Substances 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 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
- F02B61/02—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving cycles
-
- 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
- F02B75/00—Other engines
- F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
- F02B75/18—Multi-cylinder engines
- F02B75/22—Multi-cylinder engines with cylinders in V, fan, or star arrangement
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Exhaust Silencers (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動二輪車のＬ型等の
多気筒内燃機関に関するもので、吸気系の配置、排気管
の配置に工夫を講じることによって、エンジンを著しく
コンパクトにするとともに排気管の放熱性を向上させる
ために利用して、有効なものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-cylinder internal combustion engine such as an L-type motorcycle, and the engine is remarkably compacted and the exhaust gas is exhausted by devising an arrangement of an intake system and an exhaust pipe. It is effectively used to improve the heat dissipation of the tube.
【０００２】[0002]
【従来の技術】従来、自動二輪車においてはＬ型等の多
気筒内燃機関が多用されている。これらのエンジンを搭
載した自動二輪車においては、リヤシリンダの前方空間
に吸気系のエヤクリーナ、エヤクリーナからの空気を各
キャブレタに分配するためのエヤチャンバを設けてい
る。リヤシリンダの前方には車体フレームを構成するダ
ウンチューブ、フロントシリンダ等があり、上方には燃
料タンクがあるために、このリヤシリンダの前方空間は
極めて狭く、この空間には他の機器も配置されるため、
この空間に大きな空間を占有する大きなエヤクリーナ、
エヤチャンバを配置することは決して望ましいことでは
ない。空間的な制約のみならず、従来の吸気系の配置に
よるときは、エヤクリーナとキャブレタとの間にエヤチ
ャンバが配置されているために吸気管路が長く、吸気抵
抗が大きく、さらに各シリンダまでの吸気管路の長さが
著しく異なることになるために各シリンダへの吸気にア
ンバランスを生じるという問題がある。この問題は同様
の理由によりＶ型エンジンを搭載した自動二輪車につい
ても内在する問題である。2. Description of the Related Art Conventionally, an L-type multi-cylinder internal combustion engine is often used in a motorcycle. In motorcycles equipped with these engines, an air cleaner for the intake system and an air chamber for distributing air from the air cleaner to each carburetor are provided in the space in front of the rear cylinder. In front of the rear cylinder, there are down tubes and front cylinders that make up the vehicle body frame, and because there is a fuel tank above, the space in front of this rear cylinder is extremely small, and other equipment is also placed in this space. ,
A large air cleaner that occupies a large space in this space,
Positioning the air chamber is by no means desirable. Not only due to space restrictions, but with the conventional intake system arrangement, the intake chamber is located between the air cleaner and the carburetor, so the intake line is long and the intake resistance is high. There is a problem that imbalance occurs in the intake air to each cylinder because the lengths of the pipelines are significantly different. This problem is inherent in a motorcycle equipped with a V engine for the same reason.
【０００３】[0003]
【発明が解決しようとする課題】本発明は、このような
事情に鑑みなされたものであって、リヤシリンダ回りの
空間を有効に利用して吸気系の機器を配置することによ
って、著しくコンパクトで、各シリンダの吸気管の長さ
を短縮し、その長さをほぼ均一にし、さらに、排気管の
放熱性を向上させた自動二輪車の多気筒内燃機関を提供
することをその課題とするものである。SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is extremely compact by arranging the devices of the intake system by effectively utilizing the space around the rear cylinder. It is an object of the present invention to provide a multi-cylinder internal combustion engine for a motorcycle in which the length of the intake pipe of each cylinder is shortened, the length is made substantially uniform, and the heat dissipation of the exhaust pipe is improved. .
【０００４】[0004]
【課題を解決するための手段】上記課題解決のために講
じた手段は次の要素（イ）〜（ニ）によって構成される
ものである。 （イ）フロントシリンダ用のエヤクリーナをリヤシリン
ダの前方空間に配置して、フロントシリンダ用のキャブ
レタをダウンドラフト配置としたこと、 （ロ）リヤシリンダ用のエヤクリーナをリヤシリンダの
後方空間に配置して、リヤシリンダ用のキャブレタをサ
イドドラフト配置したこと、 （ハ）フロントシリンダの排気管をフロントシリンダか
ら下方へ突出させ、エンジンの前方部を迂回させてのち
後方へ延設させたこと、 （ニ）リヤシリンダの排気管をリヤシリンダから前方へ
突出させ、エンジンの前方部を下方へ延設し、フロント
シリンダの排気管に沿わせて設けたこと。[Means for Solving the Problems] The measures taken for solving the above problems are constituted by the following elements (a) to (d). (A) The air cleaner for the front cylinder is placed in the front space of the rear cylinder, and the carburetor for the front cylinder is placed in a down-draft arrangement. (B) The air cleaner for the rear cylinder is placed in the space behind the rear cylinder to provide the rear cylinder. The carburetor of the above was placed in a side draft, and (c) the exhaust pipe of the front cylinder was projected downward from the front cylinder, bypassing the front part of the engine and then extended to the rear, (d) the exhaust pipe of the rear cylinder The front portion of the engine is extended downward and is provided along the exhaust pipe of the front cylinder.
【０００５】[0005]
【作 用】Ｌ型等の多気筒内燃機関を搭載した自動二輪
車の該内燃機関のフロントシリンダとリヤシリンダの吸
気系をそれぞれリヤシリンダの前方空間領域と後方空間
領域とに完全に分離して配置したことにより、それぞれ
の吸気系を小さくしてリヤシリンダの狭い前方空間領域
と狭い後方空間領域とにそれぞれ収めることができる。
また、フロントシリンダ用のキャブレタをダウンドラフ
ト配置としたこと、リヤシリンダ用のキャブレタをサイ
ドドラフト配置としたことによって、それぞれの吸気系
の吸気管の長さはほぼ均一になり、かつ短縮されるので
各シリンダ間の吸気のアンバランスはなく、さらに吸気
抵抗は小さくなるので吸気効率が向上する。したがっ
て、リヤシリンダの前方空間に大型のエヤクリーナ、エ
ヤチャンバを設けることに伴う従来の上記多気筒内燃機
関を搭載した自動二輪車における吸気系に内在する上記
の問題はすべて解消される。[Operation] The intake systems of the front cylinder and the rear cylinder of the internal combustion engine of a motorcycle equipped with an L-type multi-cylinder internal combustion engine are completely separated and arranged in the front space region and the rear space region of the rear cylinder, respectively. As a result, the respective intake systems can be made smaller and can be accommodated in the narrow front space region and the narrow rear space region of the rear cylinder, respectively.
Also, by arranging the carburetor for the front cylinder in the down-draft arrangement and the carburetor for the rear cylinder in the side-draft arrangement, the lengths of the intake pipes of the respective intake systems are made substantially uniform and shortened. Since there is no imbalance in intake air between the cylinders and the intake resistance decreases, intake efficiency improves. Therefore, all of the above problems inherent in the intake system of the motorcycle equipped with the conventional multi-cylinder internal combustion engine, which accompanies the provision of a large air cleaner and an air chamber in the front space of the rear cylinder, are solved.
【０００６】[0006]
【実 施 例】次いで本発明の一実施例を、図面を参照
しつつ説明する。車体フレーム１０にダウンチューブ１
０１の後方においてＬ型多気筒内燃機関２０が搭載され
ている。この実施例においてはフロントシリンダ２１ａ
は水平であり、リヤーシリンダ２１は垂直である。リヤ
シリンダ２１の前方空間の上部にフロントシリンダ用の
エヤクリーナ２６ａを配置し、このエヤクリーナ２６ａ
とフロントシリンダ２１ａとの間にフロントシリンダ用
のキャブレタ３０ａをダウンドラフト配置し、吸気管路
２２ａを介してフロントシリンダの吸気口に接続されて
いる。また、リヤシリンダの後方空間の上部にリヤシリ
ンダ用のエヤクリーナ２６を配置し、このエヤクリーナ
２６とリヤシリンダ２１との間にリヤシリンダ用のキャ
ブレタ３０をサイドドラフト配置し、吸気管路２２を介
してリヤシリンダの吸気口に接続されている。フロント
シリンダの吸気口に対抗して設けられた排気口２３ａに
接続された排気管２４ａはフロントシリンダの下方ヘ突
出し、エンジンの前方部を迂回して後方へ伸びている。
また、リヤシリンダの吸気口に対抗して設けられた排気
口２３に接続された排気管２４はリヤシリンダの前方へ
突出し、エンジンの前方部を迂回して後方へ伸びてい
る。この排気管２４は他の排気管２４ａに沿っていて、
排気管２４ａとともにマフラ２５に接続されている。以
上の配置により、リヤシリンダ２１の前後の空間を有効
に利用することができ、各シリンダの吸気管の長さをほ
ぼ均一にすることができる。なお、図中、符号１１は前
フォーク、１２は前輪、１３はリヤアーム、１４は後
輪、１５は燃料タンク、１６はシート、１７はハンドル
である。EXAMPLES Next, an example of the present invention will be described with reference to the drawings. Down tube 1 on body frame 10
An L-type multi-cylinder internal combustion engine 20 is mounted behind 01. In this embodiment, the front cylinder 21a
Is horizontal and the rear cylinder 21 is vertical. The air cleaner 26a for the front cylinder is arranged above the front space of the rear cylinder 21.
The carburetor 30a for the front cylinder is arranged in a down-draft between the front cylinder 21a and the front cylinder 21a, and is connected to the intake port of the front cylinder via the intake pipe line 22a. Further, an air cleaner 26 for the rear cylinder is arranged above the rear space of the rear cylinder, a carburetor 30 for the rear cylinder is arranged in a side draft between the air cleaner 26 and the rear cylinder 21, and an intake port of the rear cylinder is provided via an intake pipe line 22. It is connected to the. An exhaust pipe 24a connected to an exhaust port 23a provided opposite to the intake port of the front cylinder projects below the front cylinder and bypasses the front portion of the engine and extends rearward.
An exhaust pipe 24 connected to an exhaust port 23 provided opposite the intake port of the rear cylinder projects forward of the rear cylinder and bypasses the front portion of the engine and extends rearward. This exhaust pipe 24 is along another exhaust pipe 24a,
It is connected to the muffler 25 together with the exhaust pipe 24a. With the above arrangement, the space before and after the rear cylinder 21 can be effectively used, and the length of the intake pipe of each cylinder can be made substantially uniform. In the figure, reference numeral 11 is a front fork, 12 is a front wheel, 13 is a rear arm, 14 is a rear wheel, 15 is a fuel tank, 16 is a seat, and 17 is a handle.
【０００７】[0007]
【効 果】前記の本発明の課題は新規である。したがっ
て、この課題を解決して多気筒内燃機関を搭載した従来
の自動二輪車の吸気系の配置に関する問題を解決したこ
とが本発明の最大の特有の効果である。さらに排気管の
配置を前記のとおりにしたことにより、排気管がエンジ
ンの前方部に位置し、走行風を最も良く受けることにな
るので、排気管の走行風による冷却効果を向上させるこ
とができる。[Effects] The above-mentioned object of the present invention is novel. Therefore, the most peculiar effect of the present invention is to solve this problem and solve the problem concerning the arrangement of the intake system of the conventional motorcycle equipped with the multi-cylinder internal combustion engine. Further, by disposing the exhaust pipe as described above, the exhaust pipe is located in the front part of the engine and receives the traveling wind most, so that the cooling effect of the traveling wind on the exhaust pipe can be improved. .
【図１】本発明の実施例の正面図である。FIG. 1 is a front view of an embodiment of the present invention.
１０・・・車体フレーム １０１・・・ダウンチューブ ２０・・・Ｌ型多気筒内燃機関 ２１・・・リヤシリンダ ２１ａ・・・フロントシリンダ ２２、２２ａ・・・吸気管路 ２３、２３ａ・・・排気口 ２４、２４ａ・・・排気管 ２５・・・マフラ ２６・・・リヤシリンダ用のエヤクリーナ ２６ａ・・・フロントシリンダ用のエヤクリーナ ３０・・・リヤシリンダ用のキャブレタ ３０ａ・・・フロントシリンダ用のキャブレタ 10 ... Body frame 101 ... Down tube 20 ... L type multi-cylinder internal combustion engine 21 ... Rear cylinder 21a ... Front cylinder 22, 22a ... Intake pipe line 23, 23a ... Exhaust port 24, 24a ... Exhaust pipe 25 ... Muffler 26 ... Air cleaner for rear cylinder 26a ... Air cleaner for front cylinder 30 ... Carburetor for rear cylinder 30a ... Carburetor for front cylinder
Claims (1)
シリンダの前方空間に配置して、フロントシリンダ用の
キャブレタをダウンドラフト配置し、リヤシリンダ用の
エヤクリーナをリヤシリンダの後方空間に配置して、リ
ヤシリンダ用のキャブレタをサイドドラフト配置し、フ
ロントシリンダの排気管をフロントシリンダから下方へ
突出させ、エンジンの前方部を迂回させてのち後方へ延
設させ、リヤシリンダの排気管をリヤシリンダから前方
へ突出させ、エンジンの前方部を下方へ延設し、フロン
トシリンダの排気管に沿わせて設けた自動二輪車の多気
筒内燃機関。1. An air cleaner for a front cylinder is arranged in a space in front of a rear cylinder, a carburetor for a front cylinder is arranged in a down-draft, an air cleaner for a rear cylinder is arranged in a space behind a rear cylinder, and a carburetor for a rear cylinder is arranged. Side draft arrangement, the exhaust pipe of the front cylinder projects downward from the front cylinder, bypasses the front part of the engine and then extends rearward, the exhaust pipe of the rear cylinder projects forward from the rear cylinder, and the front part of the engine Is a multi-cylinder internal combustion engine for a motorcycle, which is extended downward and is provided along the exhaust pipe of the front cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3045681A JPH0633061B2 (en) | 1991-02-20 | 1991-02-20 | Multi-cylinder internal combustion engine for motorcycles |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3045681A JPH0633061B2 (en) | 1991-02-20 | 1991-02-20 | Multi-cylinder internal combustion engine for motorcycles |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59031058A Division JPH0629578B2 (en) | 1984-02-21 | 1984-02-21 | Synchronous opening / closing device for intake throttle valve of multi-cylinder internal combustion engine in motorcycle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04212684A JPH04212684A (en) | 1992-08-04 |
| JPH0633061B2 true JPH0633061B2 (en) | 1994-05-02 |
Family
ID=12726139
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3045681A Expired - Lifetime JPH0633061B2 (en) | 1991-02-20 | 1991-02-20 | Multi-cylinder internal combustion engine for motorcycles |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0633061B2 (en) |
-
1991
- 1991-02-20 JP JP3045681A patent/JPH0633061B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04212684A (en) | 1992-08-04 |
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