JP2000213366A - Universal v-type internal combustion engine - Google Patents

Universal v-type internal combustion engine

Info

Publication number
JP2000213366A
JP2000213366A JP11011146A JP1114699A JP2000213366A JP 2000213366 A JP2000213366 A JP 2000213366A JP 11011146 A JP11011146 A JP 11011146A JP 1114699 A JP1114699 A JP 1114699A JP 2000213366 A JP2000213366 A JP 2000213366A
Authority
JP
Japan
Prior art keywords
air cleaner
banks
fuel tank
internal combustion
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.)
Granted
Application number
JP11011146A
Other languages
Japanese (ja)
Other versions
JP4280345B2 (en
Inventor
Hiroshi Funai
宏 舟井
Hiroaki Kojima
洋明 小嶋
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.)
Honda Motor Co Ltd
Original Assignee
Honda Motor 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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP01114699A priority Critical patent/JP4280345B2/en
Publication of JP2000213366A publication Critical patent/JP2000213366A/en
Application granted granted Critical
Publication of JP4280345B2 publication Critical patent/JP4280345B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related 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
    • F02B75/00Other engines
    • F02B75/16Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18Multi-cylinder engines
    • F02B75/22Multi-cylinder engines with cylinders in V, fan, or star arrangement

Abstract

PROBLEM TO BE SOLVED: To effectively cool not only respective banks and a carburetor but also a fuel tank even if the fuel tank is integrally provided. SOLUTION: In this internal combustion engine E, a carburetor 15 is arranged between a first bank and a second bank B2. In this case, a fuel tank 25 and an air cleaner 24 are adjacently arranged above a valley part 18 between both banks B2 and along the axial direction of a crank shaft 3, and a cooling air passage 22 continuous with the inside of a shroud 19 for housing a cooling fan 17 is formed on the valley part 18 by both banks B2, the fuel tank 25 and the air cleaner 24.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は,汎用V型内燃機関
に関し,特に,クランク軸の軸端側からの正面視で,ク
ランクケースの上部にV字状に配置された第1バンク及
び第2バンク間に,両バンクに混合気を供給する気化器
を配置し,クランク軸の一端に固着された冷却ファンを
収容するシュラウドを,これによりクランクケース及び
両バンクの正面を覆うように配設したものゝ改良に関す
る。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a general-purpose V-type internal combustion engine, and more particularly, to a first bank and a second bank arranged in a V-shape at an upper part of a crankcase when viewed from the shaft end side of a crankshaft. A carburetor for supplying air-fuel mixture to both banks is arranged between the banks, and a shroud for accommodating a cooling fan fixed to one end of the crankshaft is arranged so as to cover the front of the crankcase and both banks. Things related to improvement.

【0002】[0002]

【従来の技術】かゝる汎用V型内燃機関は,例えば特開
昭53−92056号公報に開示されているように,既
に知られている。
2. Description of the Related Art Such a general-purpose V-type internal combustion engine is already known, for example, as disclosed in Japanese Patent Application Laid-Open No. 53-92056.

【0003】[0003]

【発明が解決しようとする課題】上記公報に開示されて
いる汎用V型内燃機関では,両バンク間の谷部の上方
に,水平方向に偏平なエアクリーナを配置しており,燃
料タンクの配置については考慮されていないので,燃料
タンクは別途設置されるものと思われる。
In the general-purpose V-type internal combustion engine disclosed in the above publication, a horizontally flat air cleaner is arranged above a valley between the banks, and the arrangement of the fuel tank is restricted. It is considered that the fuel tank will be installed separately because of no consideration.

【0004】本発明は,大容量の燃料タンクを一体に備
えるにも拘らず,各バンク及び気化器のみならず,燃料
タンクの冷却をも効果的に行い得るようにした,前記汎
用V型内燃機関を提供することを目的とする。
[0004] The present invention relates to a general-purpose V-type internal combustion engine capable of effectively cooling not only each bank and the carburetor but also the fuel tank, despite the fact that a large-capacity fuel tank is integrally provided. The purpose is to provide institutions.

【0005】[0005]

【課題を解決するための手段】上記目的を達成するため
に,本発明は,クランク軸の軸端側からの正面視で,ク
ランクケースの上部にV字状に配置された第1バンク及
び第2バンク間に,両バンクに混合気を供給する気化器
を配置し,クランク軸の一端に固着された冷却ファンを
収容するシュラウドを,これによりクランクケース及び
両バンクの正面を覆うように配設した,汎用V型内燃機
関において,前記気化器に供給すべき燃料を貯留する燃
料タンクと,前記気化器の吸入空気を浄化するエアクリ
ーナとを,これらが両バンク間の谷部の上方でクランク
軸の軸方向に沿って隣接するように配置し,前記シュラ
ウドを,これが前記気化器の正面を覆うように形成し,
前記両バンク,燃料タンク及びエアクリーナにより前記
シュラウド内部に連なる冷却風通路を前記谷部に画成し
たことを第1の特徴とする。
In order to achieve the above object, the present invention is directed to a first bank and a first bank arranged in a V-shape at an upper part of a crankcase when viewed from the front end side of a crankshaft. A carburetor for supplying air-fuel mixture to both banks is arranged between the two banks, and a shroud for accommodating a cooling fan fixed to one end of the crankshaft is arranged so as to cover the front of the crankcase and both banks. In the general-purpose V-type internal combustion engine, a fuel tank for storing fuel to be supplied to the carburetor and an air cleaner for purifying intake air of the carburetor are provided on a crankshaft above a valley between the two banks. The shroud is formed such that it covers the front of the carburetor,
A first feature is that a cooling air passage communicating with the inside of the shroud is defined in the valley by the two banks, the fuel tank, and the air cleaner.

【0006】この第1の特徴によれば,汎用V型内燃機
関に,両バンクに干渉されることなく大容量の燃料タン
クを一体に備えることができる。しかも,この燃料タン
クは,両バンク,エアクリーナ及びシュラウドと協働し
て,シュラウド内に連なる冷却風通路を両バンク間の谷
部に画成するので,冷却風通路の構成が簡単であると共
に,冷却ファンからシュラウドを通して冷却風通路に圧
送される冷却風により,両バンク及び気化器のみなら
ず,燃料タンクの底面をも効果的に冷却することができ
る。したがって燃料タンクは,両バンクの上方に位置す
るも,両バンクによる加熱を回避することができる。
According to the first feature, the general-purpose V-type internal combustion engine can be integrally provided with a large-capacity fuel tank without interference between both banks. Moreover, this fuel tank cooperates with the two banks, the air cleaner and the shroud to define a cooling air passage extending in the shroud at a valley between the banks, so that the structure of the cooling air passage is simple and By the cooling air that is sent from the cooling fan to the cooling air passage through the shroud, not only both banks and the carburetor but also the bottom surface of the fuel tank can be effectively cooled. Therefore, even though the fuel tank is located above both banks, heating by both banks can be avoided.

【0007】また本発明は,上記特徴に加えて,前記シ
ュラウドの直上に前記エアクリーナを配置して,このエ
アクリーナの吸入口を前記冷却風通路の上流側に開口し
たことを第2の特徴とする。
In a second aspect of the present invention, in addition to the above features, the air cleaner is disposed immediately above the shroud, and a suction port of the air cleaner is opened on an upstream side of the cooling air passage. .

【0008】この第2の特徴によれば,エアクリーナ
は,シュラウドを通過した比較的奇麗で且つ比較的低温
な空気を吸入することになり,エアクリーナの寿命を延
ばすと共に,機関の充填効率を高めて出力向上を図るこ
とができる。
According to the second feature, the air cleaner draws relatively clean and relatively low-temperature air that has passed through the shroud, thereby extending the life of the air cleaner and increasing the charging efficiency of the engine. Output can be improved.

【0009】さらに本発明は,第1又は第2の特徴に加
えて,前記燃料タンクの,エアクリーナ側々面に,前記
エアクリーナ及び気化器間を接続する吸気ダクトを受容
する凹部を形成したことを第3の特徴とする。
Further, in addition to the first or second feature, the present invention is characterized in that a recess for receiving an intake duct connecting the air cleaner and the carburetor is formed on each side of the air cleaner of the fuel tank. This is the third feature.

【0010】この第3の特徴によれば,吸気ダクトに干
渉されることなく,燃料タンク及びエアクリーナの近接
した隣接配置が可能となり,冷却風通路から燃料タンク
及びエアクリーナ間への冷却風のリークを極力少なくす
ることができると共に,外観の向上に寄与し得る。
According to the third feature, the fuel tank and the air cleaner can be arranged close to each other without being interfered by the intake duct, and leakage of the cooling air from the cooling air passage to between the fuel tank and the air cleaner can be reduced. It can be reduced as much as possible and can contribute to the improvement of appearance.

【0011】[0011]

【発明の実施の形態】以下,本発明の実施の形態を,添
付図面に示す本発明の実施例に基づいて説明する。
Embodiments of the present invention will be described below based on embodiments of the present invention shown in the accompanying drawings.

【0012】図1は本発明の汎用V型内燃機関の正面
図,図2は同内燃機関の,シュラウドを取り外した状態
での一部縦断正面図,図3は図1の3−3線断面図であ
る。
FIG. 1 is a front view of a general-purpose V-type internal combustion engine of the present invention, FIG. 2 is a partially longitudinal front view of the internal combustion engine with a shroud removed, and FIG. 3 is a cross-sectional view taken along line 3-3 in FIG. FIG.

【0013】先ず,図1及び図2において,汎用V型内
燃機関Eは,クランクケース1の上部に,その正面視で
V字状に配置される第1及び第2バンクB1 ,B2 が連
設され,これらバンクB1 ,B2 の開き角度は,クラン
クケース1に支承されるクランク軸3を中心として90
°に設定されている。またクランクケース1の底部に設
置用フランジ1aが形成される。
First, in FIGS. 1 and 2, a general-purpose V-type internal combustion engine E has first and second banks B 1 and B 2 arranged in a V-shape when viewed from the front on the upper part of a crankcase 1. The opening angles of these banks B 1 and B 2 are set to 90 degrees around the crankshaft 3 supported on the crankcase 1.
° is set. An installation flange 1 a is formed on the bottom of the crankcase 1.

【0014】図2及び図3に示すように,第1及び第2
バンクB1 ,B2 は,それぞれクランクケース1の上面
に一体に連設されるシリンダブロック2と,このシリン
ダブロック2の上面に接合されるシリンダヘッド4とか
らなっている。クランクケース1の前後両側壁に支承さ
れるクランク軸3は単一のクランクピン3aを備えてお
り,これに各シリンダブロック2の単一のシリンダボア
2aに嵌装されるピストン5がコンロッド6を介して連
接される。
As shown in FIGS. 2 and 3, first and second
Each of the banks B 1 , B 2 is composed of a cylinder block 2 integrally connected to the upper surface of the crankcase 1 and a cylinder head 4 joined to the upper surface of the cylinder block 2. The crankshaft 3 supported on both front and rear side walls of the crankcase 1 is provided with a single crankpin 3a, on which a piston 5 fitted in a single cylinder bore 2a of each cylinder block 2 is connected via a connecting rod 6. Connected.

【0015】クランク軸3の一端には冷却ファン17が
取付けられ,他端は動力取出し部3bとされる。
A cooling fan 17 is attached to one end of the crankshaft 3 and the other end is a power take-out portion 3b.

【0016】上記冷却ファン17を収容しながらクラン
クケース1,両バンクB1 ,B2 及び,両バンクB1
2 間の谷部18の正面を覆うシュラウド19がクラン
クケース1及び両バンクB1 ,B2 に取付けられる。シ
ュラウド19には,冷却ファン17に対面する部分に多
数の同心円スリット状の冷却風入口20が設けられる。
While housing the cooling fan 17, the crankcase 1, both banks B 1 and B 2 and both banks B 1 and B 1
Shroud 19 which covers the front of the valleys 18 between B 2 are attached to the crank case 1 and both the banks B 1, B 2. The shroud 19 is provided with a large number of concentric slit-shaped cooling air inlets 20 at a portion facing the cooling fan 17.

【0017】各シリンダヘッド4には,シリンダボア2
aに開口する吸気ポート7及び排気ポート(図示せず)
が形成されると共に,これらを開閉する吸気弁7A及び
排気弁(図示せず)が設けられる。吸気ポート7及び排
気ポートは,シリンダヘッド4の,クランク軸3の軸方
向を向く両側面にそれぞれ開口しており,その両側面に
吸気マニホールド10及び排気マニホールド(図示せ
ず)がそれぞれ接合される。
Each cylinder head 4 has a cylinder bore 2
Intake port 7 and exhaust port (not shown) opening to a
Are formed, and an intake valve 7A and an exhaust valve (not shown) for opening and closing them are provided. The intake port 7 and the exhaust port are respectively opened on both sides of the cylinder head 4 facing the axial direction of the crankshaft 3, and an intake manifold 10 and an exhaust manifold (not shown) are respectively joined to the both sides. .

【0018】吸気マニホールド10は,その中央部に配
置される分配チャンバ12と,この分配チャンバ12の
両側壁から延出する一対の分岐管13,13とから構成
され,それら分岐管13,13の下流端の連結フランジ
13a,13aが対応するシリンダヘッド4にボルト1
4により接合され,これにより各分岐管13,13の内
部が対応する吸気ポート7と連通される。また分配チャ
ンバ12の上面に入口が設けられ,その上面に気化器1
5が取付けられる。こうして気化器15は,両バンクB
1 ,B2 間の谷部18のシュラウド19側に寄った位置
に配置される。この気化器15は,その吸気道を鉛直方
向へ向けたダウンドラフト型に構成されている。この気
化器15のメンテナンスを容易に行い得るように,シュ
ラウド19の,気化器15に対面する部分は,着脱可能
のリッド19aに構成される。
The intake manifold 10 comprises a distribution chamber 12 disposed at the center thereof and a pair of branch pipes 13 extending from both side walls of the distribution chamber 12. The connecting flanges 13a, 13a at the downstream end have bolts 1 attached to the corresponding cylinder head 4.
4, whereby the inside of each branch pipe 13 is communicated with the corresponding intake port 7. An inlet is provided on the upper surface of the distribution chamber 12, and the vaporizer 1 is provided on the upper surface.
5 is attached. Thus, the vaporizer 15 is connected to both banks B
Is arranged at a position closer to 1, the shroud 19 side of the valley portion 18 between the B 2. The carburetor 15 is of a down-draft type with its intake path directed vertically. The portion of the shroud 19 facing the vaporizer 15 is configured as a detachable lid 19a so that maintenance of the vaporizer 15 can be easily performed.

【0019】この気化器15に供給すべき燃料を貯留す
る燃料タンク25と,この気化器15の吸入空気を浄化
するエアクリーナ24とが,これらが両バンクB1 ,B
2 間の谷部18の上方でクランク軸3の軸方向に沿って
隣接するように配置される。その際,エアクリーナ24
は燃料タンク25との隣接方向に偏平に形成されると共
に,シュラウド19の直上に配置される。
A fuel tank 25 for storing fuel to be supplied to the carburetor 15 and an air cleaner 24 for purifying the intake air of the carburetor 15 are composed of both banks B 1 , B
The crankshaft 3 is disposed adjacent to and above the valley 18 between the two along the axial direction of the crankshaft 3. At that time, the air cleaner 24
Is formed flat in the direction adjacent to the fuel tank 25 and is disposed immediately above the shroud 19.

【0020】而して,両バンクB1 ,B2 ,燃料タンク
25及び,エアクリーナ24は,シュラウド19内に連
なる冷却風通路22を谷部18に画成し,この冷却風通
路22は,シュラウド19と反対側が外部に開放した冷
却出口21とされる。
The banks B 1 and B 2 , the fuel tank 25, and the air cleaner 24 define a cooling air passage 22 connected to the inside of the shroud 19 in the valley 18. The side opposite to 19 is a cooling outlet 21 opened to the outside.

【0021】エアクリーナ24は,機関E外方側々面を
開放したエアクリーナケース27と,このエアクリーナ
ケース27に,その開放面を覆うように左右一対のクリ
ップ26,26により着脱可能に結合されるエアクリー
ナカバー28と,これらエアクリーナケース27及びエ
アクリーナカバー28間に挟持されるエアクリーナエレ
メント29とを備えており,エアクリーナカバー28に
は,エアクリーナエレメント29の一側面が臨む未浄化
室30が,またエアクリーナケース27には,エアクリ
ーナエレメント29の他側面が臨む浄化室31がそれぞ
れ設けられる。またエアクリーナケース27の下部に
は,上記未浄化室30に連なると共に,前記冷却風通路
22の上流側に開口する吸入口32が設けられ,さらに
該ケース27の背面には,気化器15の吸気道に接続さ
れる吸気ダクト33が一体に突設される。
The air cleaner 24 is removably connected to the air cleaner case 27 with a pair of left and right clips 26, 26 so as to cover the open surfaces. A cover 28 and an air cleaner element 29 sandwiched between the air cleaner case 27 and the air cleaner cover 28 are provided. The air cleaner cover 28 has an unpurified chamber 30 on which one side of the air cleaner element 29 faces, and the air cleaner case 27. Is provided with a purifying chamber 31 on which the other side of the air cleaner element 29 faces. A suction port 32 is provided below the air cleaner case 27 and communicates with the unpurified chamber 30 and opens upstream of the cooling air passage 22. An intake duct 33 connected to the road protrudes integrally.

【0022】このエアクリーナケース27の背面に隣接
する燃料タンク25は,両バンクB 1 ,B2 の頭部に立
設される前後一対のブラケット34,34に取付けられ
て,両バンクB1 ,B2 及び谷部18の上面全体を覆う
ように配置される。この燃料タンク25の,エアクリー
ナ24側々面には,前記吸気ダクト33を受容する凹部
35が形成され,また上面には,キャップ36を施す給
油口25aが設けられる。
Adjacent to the back of this air cleaner case 27
The fuel tank 25 is installed in both banks B 1, BTwoStanding on the head
Attached to a pair of front and rear brackets 34
And both banks B1, BTwoAnd the entire upper surface of the valley 18
Are arranged as follows. The air cleaner of this fuel tank 25
A concave portion for receiving the intake duct 33 is provided on each side of the nut 24.
A cap 36 is provided on the upper surface.
An oil port 25a is provided.

【0023】次に,この実施例の作用について説明す
る。
Next, the operation of this embodiment will be described.

【0024】各バンクB1 ,B2 の吸気行程時,エアク
リーナ24の吸入口32から未浄化室30に流入した空
気は,エアクリーナエレメント29により濾過されて浄
化室31に移り,吸入ダクト33を経て気化器15に導
入され,こゝで燃料を混合された後,吸気マニホールド
10により各バンクB1 ,B2 に分配されて,対応する
吸入ポート7,7へと吸入される。
During the intake stroke of each of the banks B 1 and B 2 , the air that has flowed into the unpurified chamber 30 from the suction port 32 of the air cleaner 24 is filtered by the air cleaner element 29, moves to the purification chamber 31, and passes through the suction duct 33. After being introduced into the carburetor 15 where the fuel is mixed, it is distributed to the banks B 1 and B 2 by the intake manifold 10 and is drawn into the corresponding suction ports 7 and 7.

【0025】一方,冷却ファン17の回転により,シュ
ラウド19の冷却風入口20に流入した外気即ち冷却風
は,シュラウド19に誘導されて冷却風通路22へ圧送
されるので,この冷却風通路22に臨む第1,第2バン
クB1 ,B2 ,気化器15及び燃料タンク25を冷却し
て,冷却風出口21から外部へと排出される。
On the other hand, by the rotation of the cooling fan 17, the outside air flowing into the cooling air inlet 20 of the shroud 19, that is, the cooling air, is guided by the shroud 19 and is pressure-fed to the cooling air passage 22. The first and second banks B 1 and B 2 , the carburetor 15 and the fuel tank 25 are cooled, and are discharged from the cooling air outlet 21 to the outside.

【0026】ところで,燃料タンク25は,両バンクB
1 ,B2 の上面及び谷部18全体を覆うようにして,両
バンクB1 ,B2 に支持されるので,両バンクB1 ,B
2 に干渉されることなく大容量の燃料タンク25の採用
が可能となり,しかも相隣る燃料タンク25及びエアク
リーナ24と,エアクリーナ24の直下に配置されるシ
ュラウド19によって谷部18のみならず,気化器15
を覆い隠すことができて,外観の向上を図ることができ
る。
The fuel tank 25 is provided in both banks B
1, the entire upper surface and the valleys 18 of the B 2 a so as to cover, because it is supported on both the banks B 1, B 2, both the banks B 1, B
Adoption of the fuel tank 25 of a large capacity without being interfered by the 2 becomes possible, moreover the Aitonaru fuel tank 25 and the air cleaner 24, not valleys 18 only by a shroud 19 which is disposed immediately below the air cleaner 24, vaporizing Table 15
Can be covered and the appearance can be improved.

【0027】しかも,燃料タンク25は,エアクリーナ
24及び両バンクB1 ,B2 と協働して,冷却風通路2
2を両バンクB1 ,B2 間の谷部18に画成するので,
冷却風通路22の構成が簡単であると共に,上記のよう
に冷却風通路22に圧送された冷却風により,両バンク
1 ,B2 及び気化器15のみならず,燃料タンク25
の底面をも効果的に冷却することができ,燃料タンク2
5は,両バンクB1 ,B2 の上方に位置するも,両バン
クB1 ,B2 による加熱を回避することができる。
Further, the fuel tank 25 cooperates with the air cleaner 24 and the banks B 1 and B 2 to form the cooling air passage 2.
2 is defined in the valley 18 between the banks B 1 and B 2 ,
The structure of the cooling air passage 22 is simple, and the cooling air blown into the cooling air passage 22 as described above causes the fuel tank 25 as well as the two banks B 1 and B 2 and the carburetor 15.
Can effectively cool the bottom surface of the fuel tank 2
5, also located above the both banks B 1, B 2, it is possible to avoid heating by both the banks B 1, B 2.

【0028】またシュラウド19の直上に配置されたエ
アクリーナ24の吸入口32は冷却風通路22の上流側
に開口しているから,エアクリーナ24は,シュラウド
19を通過した比較的奇麗で且つ比較的低温な空気を吸
入することになり,エアクリーナ24の延命化を図ると
共に,機関の充填効率を高めてその出力向上を図ること
ができる。
Further, since the suction port 32 of the air cleaner 24 disposed immediately above the shroud 19 is opened on the upstream side of the cooling air passage 22, the air cleaner 24 is relatively clean and has a relatively low temperature passing through the shroud 19. As a result, the life of the air cleaner 24 can be prolonged, and the output of the engine can be improved by increasing the charging efficiency of the engine.

【0029】さらに燃料タンク25の,エアクリーナ2
4側々面には,エアクリーナ24及び気化器15間を接
続する吸気ダクト33を受容する凹部35が形成される
ので,吸気ダクト33に干渉されることなく,燃料タン
ク25及びエアクリーナ24の近接した隣接配置が可能
となり,冷却風通路22から燃料タンク25及びエアク
リーナ24間への冷却風のリークを極力少なくすること
ができると共に,外観の向上に寄与し得る。
Further, the air cleaner 2 of the fuel tank 25
The recesses 35 for receiving the intake duct 33 connecting the air cleaner 24 and the carburetor 15 are formed on the four side surfaces, so that the fuel tank 25 and the air cleaner 24 are in close proximity without being interfered by the intake duct 33. Adjacent arrangement becomes possible, and the leakage of the cooling air from the cooling air passage 22 to the space between the fuel tank 25 and the air cleaner 24 can be reduced as much as possible, and the appearance can be improved.

【0030】本発明は,上記実施例に限定されるもので
はなく,その要旨を逸脱しない範囲で種々の設計変更が
可能である。例えば,各バンクB1 ,B2 を多気筒型に
構成することもできる。
The present invention is not limited to the above-described embodiment, and various design changes can be made without departing from the gist of the present invention. For example, each of the banks B 1 and B 2 may be configured as a multi-cylinder type.

【0031】[0031]

【発明の効果】以上のように本発明の第1の特徴によれ
ば,汎用V型内燃機関に,その第1,第2バンクに干渉
されることのない大容量の燃料タンクを一体に備えるこ
とができる。しかも,この燃料タンクは,両バンク及び
エアクリーナと協働して,シュラウド内部に連なる冷却
風通路を両バンク間の谷部に画成するので,冷却風通路
の構成が簡単であると共に,冷却ファンからシュラウド
を通して冷却風通路に圧送される冷却風により,両バン
ク及び気化器のみならず,燃料タンクの底面をも効果的
に冷却することができ,したがって両バンクによる燃料
タンクの加熱を回避することができる。
As described above, according to the first aspect of the present invention, a general-purpose V-type internal combustion engine is integrally provided with a large-capacity fuel tank which does not interfere with the first and second banks. be able to. In addition, this fuel tank cooperates with both banks and the air cleaner to define a cooling air passage connected to the inside of the shroud at a valley between the banks, so that the structure of the cooling air passage is simple and the cooling fan The cooling air that is forced into the cooling air passage through the shroud can effectively cool not only both banks and the carburetor, but also the bottom surface of the fuel tank, thus avoiding heating of the fuel tank by both banks. Can be.

【0032】また本発明の第2の特徴によれば,前記シ
ュラウドの直上に前記エアクリーナを配置して,このエ
アクリーナの吸入口を前記冷却風通路の上流側に開口し
たので,エアクリーナは,シュラウドを通過した比較的
奇麗で且つ比較的低温な空気を吸入することになり,エ
アクリーナの寿命を延ばすと共に,機関の充填効率を高
めて出力向上を図ることができる。
According to the second feature of the present invention, the air cleaner is disposed immediately above the shroud, and the suction port of the air cleaner is opened on the upstream side of the cooling air passage. The relatively clean and relatively low-temperature air that has passed through is sucked, so that the life of the air cleaner can be extended, and the charging efficiency of the engine can be increased to improve the output.

【0033】さらに本発明の第3の特徴によれば,前記
燃料タンクの,エアクリーナ側々面に,前記エアクリー
ナ及び気化器間を接続する吸気ダクトを受容する凹部を
形成したので,吸気ダクトに干渉されることなく,燃料
タンク及びエアクリーナの近接した隣接配置が可能とな
り,冷却風通路から燃料タンク及びエアクリーナ間への
冷却風のリークを極力少なくすることができると共に,
外観の向上に寄与し得る。
Further, according to the third feature of the present invention, a concave portion for receiving the intake duct connecting the air cleaner and the carburetor is formed on each side surface of the air cleaner of the fuel tank, so that the concave portion interferes with the intake duct. The fuel tank and the air cleaner can be arranged in close proximity to each other without leakage, and the leakage of cooling air from the cooling air passage to the space between the fuel tank and the air cleaner can be minimized.
It can contribute to improving the appearance.

【図面の簡単な説明】[Brief description of the drawings]

【図1】本発明の汎用V型内燃機関の正面図。FIG. 1 is a front view of a general-purpose V-type internal combustion engine of the present invention.

【図2】同内燃機関の,シュラウドを取り外した状態で
の一部縦断正面図。
FIG. 2 is a partially longitudinal front view of the internal combustion engine with a shroud removed.

【図3】図1の3−3線断面図。FIG. 3 is a sectional view taken along line 3-3 in FIG. 1;

【符号の説明】[Explanation of symbols]

1 ・・・第1バンク B2 ・・・第2バンク E・・・・汎用V型内燃機関 1・・・・クランクケース 3・・・・クランク軸 15・・・気化器 17・・・冷却ファン 18・・・谷部 19・・・シュラウド 22・・・冷却風通路 24・・・エアクリーナ 25・・・燃料タンク 32・・・エアクリーナの吸入口 33・・・吸入ダクト 35・・・凹部B 1 first bank B 2 second bank E general V-type internal combustion engine 1 crankcase 3 crankshaft 15 carburetor 17 Cooling fan 18 ... Valley 19 ... Shroud 22 ... Cooling air passage 24 ... Air cleaner 25 ... Fuel tank 32 ... Air cleaner inlet 33 ... Suction duct 35 ... Recess

Claims (3)

【特許請求の範囲】[Claims] 【請求項1】 クランク軸(3)の軸端側からの正面視
で,クランクケース(1)の上部にV字状に配置された
第1バンク(B1 )及び第2バンク(B2 )間に,両バ
ンク(B1 ,B2 )に混合気を供給する気化器(15)
を配置し,クランク軸(3)の一端に固着された冷却フ
ァン(17)を収容するシュラウド(19)を,これに
よりクランクケース(1)及び両バンク(B1 ,B2
の正面を覆うように配設した,汎用V型内燃機関におい
て,前記気化器(15)に供給すべき燃料を貯留する燃
料タンク(25)と,前記気化器(15)の吸入空気を
浄化するエアクリーナ(24)とを,これらが両バンク
(B1 ,B2 )間の谷部(18)の上方でクランク軸
(3)の軸方向に沿って隣接するように配置し,前記シ
ュラウド(19)を,これが前記気化器(15)の正面
を覆うように形成し,前記両バンク(B1 ,B2 ),燃
料タンク(25)及びエアクリーナ(24)により前記
シュラウド(19)内部に連なる冷却風通路(22)を
前記谷部(18)に画成したことを特徴とする,汎用V
型内燃機関。
1. A first bank (B 1 ) and a second bank (B 2 ) arranged in a V-shape at an upper part of a crankcase (1) when viewed from the shaft end side of a crankshaft (3). In the meantime, a carburetor (15) for supplying a mixture to both banks (B 1 , B 2 )
And a shroud (19) for accommodating a cooling fan (17) fixed to one end of the crankshaft (3), whereby the crankcase (1) and both banks (B 1 , B 2 )
In a general-purpose V-type internal combustion engine disposed so as to cover the front of the fuel tank, a fuel tank (25) for storing fuel to be supplied to the carburetor (15) and a suction air of the carburetor (15) are purified. and the air cleaner (24), arranged such that they are adjacent along the axial direction of both the banks (B 1, B 2) valleys between the upper crank shaft (18) (3), the shroud (19 ) Is formed so as to cover the front of the carburetor (15), and the two banks (B 1 , B 2 ), the fuel tank (25) and the air cleaner (24) are connected to the inside of the shroud (19) for cooling. A general-purpose V, characterized in that a wind passage (22) is defined in the valley (18).
Type internal combustion engine.
【請求項2】 請求項1記載の汎用V型内燃機関におい
て,前記シュラウド(19)の直上に前記エアクリーナ
(24)を配置すると共に,このエアクリーナ(24)
の吸入口(32)を前記冷却風通路(22)の上流側に
開口したことを特徴とする,汎用V型内燃機関。
2. The general-purpose V-type internal combustion engine according to claim 1, wherein said air cleaner (24) is disposed immediately above said shroud (19), and said air cleaner (24).
A general-purpose V-type internal combustion engine, characterized in that a suction port (32) of the internal combustion engine is opened upstream of the cooling air passage (22).
【請求項3】 請求項1又は2記載の汎用V型内燃機関
において,前記燃料タンク(25)の,エアクリーナ
(24)側々面に,前記エアクリーナ(24)及び気化
器(15)間を接続する吸気ダクト(33)を受容する
凹部(35)を形成したことを特徴とする,汎用V型内
燃機関。
3. The general-purpose V-type internal combustion engine according to claim 1, wherein the air cleaner (24) and the carburetor (15) are connected to the air cleaner (24) on each side of the fuel tank (25). A general-purpose V-type internal combustion engine characterized by forming a concave portion (35) for receiving an intake duct (33).
JP01114699A 1999-01-19 1999-01-19 General-purpose V-type internal combustion engine Expired - Fee Related JP4280345B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP01114699A JP4280345B2 (en) 1999-01-19 1999-01-19 General-purpose V-type internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP01114699A JP4280345B2 (en) 1999-01-19 1999-01-19 General-purpose V-type internal combustion engine

Publications (2)

Publication Number Publication Date
JP2000213366A true JP2000213366A (en) 2000-08-02
JP4280345B2 JP4280345B2 (en) 2009-06-17

Family

ID=11769892

Family Applications (1)

Application Number Title Priority Date Filing Date
JP01114699A Expired - Fee Related JP4280345B2 (en) 1999-01-19 1999-01-19 General-purpose V-type internal combustion engine

Country Status (1)

Country Link
JP (1) JP4280345B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009287448A (en) * 2008-05-28 2009-12-10 Honda Motor Co Ltd General-purpose v-type engine
US10240509B2 (en) 2014-04-25 2019-03-26 Yamaha Motor Power Products Kabushiki Kaisha Engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009287448A (en) * 2008-05-28 2009-12-10 Honda Motor Co Ltd General-purpose v-type engine
US10240509B2 (en) 2014-04-25 2019-03-26 Yamaha Motor Power Products Kabushiki Kaisha Engine

Also Published As

Publication number Publication date
JP4280345B2 (en) 2009-06-17

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