JPH03134219A - Two-cycle v-engine for outboard motor - Google Patents
Two-cycle v-engine for outboard motorInfo
- Publication number
- JPH03134219A JPH03134219A JP26823289A JP26823289A JPH03134219A JP H03134219 A JPH03134219 A JP H03134219A JP 26823289 A JP26823289 A JP 26823289A JP 26823289 A JP26823289 A JP 26823289A JP H03134219 A JPH03134219 A JP H03134219A
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- exhaust
- port
- engine
- scavenging
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims abstract description 24
- 230000002000 scavenging effect Effects 0.000 claims description 45
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/18—Other cylinders
- F02F1/22—Other cylinders characterised by having ports in cylinder wall for scavenging or charging
-
- 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
-
- 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
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
-
- 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
- F02B2075/1804—Number of cylinders
- F02B2075/1824—Number of cylinders six
-
- 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)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、船外機用Ｖ型２サイクルエンジンに関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a V-type two-stroke engine for an outboard motor.
［従来の技術］
従来、船外機用Ｖ型２サイクルエンジンは、第５図に示
す如く、７字をなす左右のバンクＩＬ、ＩＲに設けられ
る各気筒２（２Ｌ、２Ｒ）の排気ポート３（３Ｌ、３Ｒ
）を、それら両バンクＩＬ、ＩＲの中間領域に配置して
いる。これら各排気ポート３Ｌ、３Ｒからの排気は、両
バンクＩＬ、ＩＲの中間領域に延設される排気通路４（
４Ｌ、４Ｒ）を介して、単一のマフラーに流出せしめら
れる。この構成は、両バンクＩＬ、ＩＲの■溝状中間領
域に排気通路４Ｌ、４Ｒを延設することにて、エンジン
の外形をコンパクトにするものである。[Prior Art] Conventionally, as shown in FIG. 5, in a V-type two-stroke engine for an outboard motor, exhaust ports 3 of each cylinder 2 (2L, 2R) provided in left and right banks IL and IR forming a figure 7 are used. (3L, 3R
) is arranged in an intermediate region between the banks IL and IR. Exhaust from these exhaust ports 3L and 3R is carried out by an exhaust passage 4 (
4L, 4R) into a single muffler. This configuration allows the external shape of the engine to be made compact by extending the exhaust passages 4L and 4R into the groove-shaped intermediate regions of both banks IL and IR.
又、上記船外機用Ｖ型２サイクルエンジンにおいては、
第６図に示す如く、各気筒２の反排気ポート３側に、主
掃気ポート５Ａ、５Ｂ及び副掃気ポート５Ｃを設け、各
気筒２の主燃焼室６と点火プラグ７とを気筒中心より副
掃気ポート５Ｃ寄りに偏位してなるものがある。これは
、副掃気ポート５Ｃから流入する新気に早めに着火し、
熱効率の向上と出力の増大を図るものである。尚、第６
図において、ａは気筒中心に対する主燃焼室６の偏位置
、ｂは主燃焼室６の中心に対する点火プラグ７の偏位量
である。In addition, in the above V-type two-stroke engine for outboard motors,
As shown in FIG. 6, main scavenging ports 5A, 5B and a sub-scavenging port 5C are provided on the side opposite to the exhaust port 3 of each cylinder 2, and the main combustion chamber 6 and spark plug 7 of each cylinder 2 are connected from the center of the cylinder to the sub-scavenging port 5C. There is one that is shifted toward the scavenging port 5C. This ignites the fresh air flowing in from the sub-scavenging port 5C early,
The aim is to improve thermal efficiency and increase output. Furthermore, the 6th
In the figure, a is the offset position of the main combustion chamber 6 with respect to the center of the cylinder, and b is the amount of offset of the spark plug 7 with respect to the center of the main combustion chamber 6.
［発明が解決しようとする課題］
然しながら、従来の上記船外機用Ｖ型２サイクルエンジ
ンにあっては、第５図に示す如く、左バンクＩＬの気筒
２Ｌの副掃気ポート５Ｃと排気ポート３Ｌとを結んで定
められる掃排気方向８Ｌを右下がりの向きに設定してい
るのに対し、右バンクＩＲの気筒２Ｒの副掃気ポート５
Ｃと排気ボー）３Ｒとを結んで定められる掃排気方向８
Ｒを右上りの向きに設定している。[Problems to be Solved by the Invention] However, in the conventional V-type two-stroke engine for outboard motors, as shown in FIG. The scavenging/exhausting direction 8L determined by connecting the
Scavenging direction 8 determined by connecting C and exhaust bow) 3R
R is set upward to the right.
このため、第５図に示す如く、右バンクＩＲのためのシ
リンダヘッド９Ｒを、矢印で示す如く１８０度転回し、
左バンクＩＬ側にて共用しようとする時、該シリンダヘ
ッド９Ｒに設けられる主燃焼室６と点火プラグ７は左バ
ンクＩＬにおいてはもはや気筒中心に対する副掃気ポー
ト５Ｃ寄りに偏位せしめることがてきず、主燃焼室６と
点火プラグ７は気筒中心に対し、副掃気ポート５Ｃ寄り
から外れる方向に偏位することになる。従って、これは
共用不能である。Therefore, as shown in FIG. 5, the cylinder head 9R for the right bank IR is turned 180 degrees as shown by the arrow.
When attempting to share them on the left bank IL side, the main combustion chamber 6 and spark plug 7 provided in the cylinder head 9R can no longer be deviated toward the auxiliary scavenging port 5C with respect to the cylinder center in the left bank IL. , the main combustion chamber 6 and the spark plug 7 are offset from the center of the cylinder in a direction away from the auxiliary scavenging port 5C. Therefore, it is not sharable.
即ち、Ｖ型２サイクルエンジンにおいて、左右バンクの
中間領域に排気ポートを配置し、かっ各気筒の主燃焼室
と点火プラグとを気筒中心より掃気ポート側に偏位せし
める場合には、両バンクのシリンダヘッド、ヘッドカバ
ー、及びガスケットを互いに共用できない。In other words, in a V-type two-stroke engine, when the exhaust port is placed in the middle area between the left and right banks, and the main combustion chamber and spark plug of each cylinder are shifted from the center of the cylinder to the scavenging port side, the Cylinder heads, head covers, and gaskets cannot be shared with each other.
本発明は、エンジンの外形をコンパクト化するために左
右バンクの中間領域に排気ポートを配置し、かつ熱効率
の向上と出力の増大を図るために各気筒の主燃焼室と点
火プラグとを気筒中心より掃気ポート側に偏位せしめる
船外機用Ｖ型２サイクルエンジンを構成するに際し、両
バンクのシリンダヘッド等を互いに共用化可能とするこ
とを目的とする。The present invention arranges the exhaust port in the middle area between the left and right banks in order to make the external shape of the engine more compact, and also locates the main combustion chamber and spark plug of each cylinder in the center of the cylinder in order to improve thermal efficiency and increase output. It is an object of the present invention to make it possible to share the cylinder heads of both banks with each other when constructing a V-type two-stroke engine for an outboard motor in which the air is shifted closer to the scavenging port side.
［課題を解決するための手段］
本発明は、Ｖ字をなす左右のバンクに設けられる各気筒
の排気ポートをそれら両バンクの中間領域に配置し、各
気筒の反排気ポート側に掃気ポートを設け、各気筒の主
燃焼室位置と点火プラグ位置とを気筒中心より掃気ポー
ト寄りに偏位してなる船外機用■型２サイクルエンジン
において、左バンクの気筒の掃気ポートと排気ポートと
を結んで定められる掃排気方向と、右バンクの気筒の掃
気ポートと排気ポートとを結んで定められる掃排気方向
とを、一方向からみて同じ向きに設定したものである。[Means for Solving the Problem] The present invention arranges the exhaust ports of each cylinder provided in the left and right banks forming a V-shape in an intermediate region between the two banks, and provides a scavenging port on the side opposite to the exhaust port of each cylinder. In a type 2-cycle engine for outboard motors in which the main combustion chamber position and spark plug position of each cylinder are offset from the center of the cylinder toward the scavenging port, the scavenging port and exhaust port of the cylinder on the left bank are The scavenging and exhausting direction determined by connecting the scavenging port and the exhaust port of the right bank cylinder are set in the same direction when viewed from one direction.
［作用コ 本発明によれば、下記■〜■の作用がある。[Action Co. According to the present invention, the following effects (1) to (4) are achieved.
■容気筒の排気ポートを両バンクの■溝状中間領域に配
置したから、エンジンの外形をコンパクトとすることが
できる。■Since the exhaust port of the cylinder is placed in the groove-shaped intermediate region of both banks, the external shape of the engine can be made compact.
■容気筒の主燃焼室位置と点火プラグ位置とを気筒中心
より掃気ポート寄りに偏位したから掃気ポートから流入
する新気に早めに着火し、熱効率の向上と出力の増大を
図ることかできる。■Since the main combustion chamber and spark plug positions of the cylinder are shifted from the center of the cylinder toward the scavenging port, fresh air flowing in from the scavenging port is ignited earlier, improving thermal efficiency and increasing output. .
■左右いずれか一方のバンクだめのシリンダヘッドを１
８０度転回し、他方のバンク側に共用しようとする時、
該シリンダヘッドに設けられる主燃焼室と点火プラグは
他方のバンクにおいても気筒中心に対する同−向きに設
定されている掃気ポート寄りに偏位することとなり、共
用可能である。即ち、両バンクのシリンダヘット、ヘッ
ドカバー、及びガスケットを互いに共用できる。■Insert the cylinder head of either the left or right bank into 1
When turning 80 degrees and trying to share it with the other bank,
The main combustion chamber and spark plug provided in the cylinder head are also deviated toward the scavenging port which is set in the same direction with respect to the center of the cylinder in the other bank, so that they can be shared. That is, the cylinder heads, head covers, and gaskets of both banks can be shared.
上記■〜■により、エンジンの外形をコンパクト化する
ために左右バンクの中間領域に排気ポートを配置し、か
つ熱効率の向上と出力の増大を図るために各気筒の主燃
焼室と点火プラグとを気筒中心より掃気ポート側に偏位
せしめる船外機用Ｖ型２サイクルエンジンを構成するに
際し、両バンクのシリンダヘッド等を互いに共用てきる
。As per the above ■ to ■, the exhaust port is placed in the middle area between the left and right banks in order to make the external shape of the engine more compact, and the main combustion chamber and spark plug of each cylinder are arranged in the middle area between the left and right banks to improve thermal efficiency and increase output. When configuring a V-type two-stroke engine for an outboard motor in which the cylinder is shifted toward the scavenging port side from the center of the cylinder, the cylinder heads and the like of both banks are shared.
［実施例］
第１図は本発明の一実施例に係るエンジンのシリンダブ
ロックを示す正面図、第２図は同エンジンの断面図、第
３図は左右バンクの掃排気方向を示す模式図、第４図は
船外機を示す模式図である。[Example] Fig. 1 is a front view showing a cylinder block of an engine according to an embodiment of the present invention, Fig. 2 is a sectional view of the engine, and Fig. 3 is a schematic diagram showing the scavenging and exhausting direction of left and right banks. FIG. 4 is a schematic diagram showing the outboard motor.
船外１ａ１０は、船体１１にクランクブラケット１２、
スイツルブラケット１３を介して推進ユニット１４を取
付は可能としている。推進ユニット１４は、エンジン１
５を備え、エンジン１５の出力をトライツ軸１６、プロ
ペラ軸１７を介してプロペラ１８に伝える。The outboard 1a10 has a crank bracket 12 on the hull 11,
The propulsion unit 14 can be attached via the switch bracket 13. The propulsion unit 14 includes the engine 1
5, and transmits the output of the engine 15 to the propeller 18 via the trietz shaft 16 and the propeller shaft 17.
エンジン１５は、第１図、第２図に示す如く、シリンダ
ブロック２１、クランクケース２２、シリンダヘッド２
３、ヘットカバー２４、インナ排気カバー２５、アウタ
排気カバー２６にて外形を形成している。２７はピスト
ン、２７Ａはピストンピン、２８はクランク軸、２９は
連接棒、３０はガスケットである。As shown in FIGS. 1 and 2, the engine 15 includes a cylinder block 21, a crankcase 22, and a cylinder head 2.
3. The head cover 24, the inner exhaust cover 25, and the outer exhaust cover 26 form the outer shape. 27 is a piston, 27A is a piston pin, 28 is a crankshaft, 29 is a connecting rod, and 30 is a gasket.
この時、エンジン１５は、Ｖ型２サイクルエンジンであ
り、Ｖ字をなす左右のバンク３１Ｌ、３１Ｒに設けられ
る各気筒３２ （３２Ｌ、３２Ｒ）の排気ポート３３
（３３Ｌ、３３Ｒ）をそれら両バンク３１Ｌ、３１Ｒの
中間領域に配置している。これら各排気ポート３３Ｌ、
３３Ｒからの排気は、両バンク３１Ｌ、３１Ｒの中間領
域に延設される排気通路３４ （３４Ｌ、３４Ｒ）を介
して、単一のマフラーに流出せしめられる。各排気通路
３４Ｌ、３４Ｒの周囲には排気カバー２５．２６により
水ジャケット１０１が形成されている。At this time, the engine 15 is a V-type two-cycle engine, and the exhaust ports 33 of each cylinder 32 (32L, 32R) provided in the left and right banks 31L, 31R forming a V shape
(33L, 33R) are arranged in the intermediate region between the two banks 31L, 31R. Each of these exhaust ports 33L,
The exhaust gas from 33R flows out into a single muffler via an exhaust passage 34 (34L, 34R) extending between the banks 31L, 31R. A water jacket 101 is formed around each exhaust passage 34L, 34R by an exhaust cover 25, 26.
又、エンジン１５は、各気筒３２の反排気ポート３３側
に、主掃気ポート３５Ａ、３５Ｂ、及び副掃気ポート３
５Ｃを設け、シュニーレ掃気を実施可能としている。Further, the engine 15 has main scavenging ports 35A, 35B and a sub-scavenging port 3 on the side opposite to the exhaust port 33 of each cylinder 32.
5C is provided to enable Schneeler scavenging.
更に、エンジン１５は、シリンダヘッド２３に設けられ
る各気筒３２の反球型主燃焼室３６と点火プラグ３７と
を気筒中心より副掃気ポート３５Ｃ寄りに偏位している
。各主燃焼室３６の周囲にはシリンダヘッド２３、ヘッ
ドカバー２４により水ジャケット１０２が形成されてい
る。第１図において、ａは気筒中心に対する主燃焼室３
６の偏位量、ｂは主燃焼室３６の中心に対する点火プラ
グ３７の偏位量である。Further, in the engine 15, the anti-spherical main combustion chamber 36 and the spark plug 37 of each cylinder 32 provided in the cylinder head 23 are offset from the center of the cylinder toward the sub-scavenging port 35C. A water jacket 102 is formed around each main combustion chamber 36 by the cylinder head 23 and head cover 24 . In Fig. 1, a is the main combustion chamber 3 relative to the center of the cylinder.
6 is the deviation amount, and b is the deviation amount of the spark plug 37 with respect to the center of the main combustion chamber 36.
尚、エンジン１５において、前記主掃気ポート３５Ａ、
３５Ｂは排気ポート３３と反対側のシリンダ内壁面を指
向し、副掃気ポート３５Ｃは上記主燃焼室３６を指向す
るように設定されている。In addition, in the engine 15, the main scavenging port 35A,
35B is set to face the inner wall surface of the cylinder opposite to the exhaust port 33, and the sub-scavenge port 35C is set to face the main combustion chamber 36.
然して、エンジン１５にあワては、第１図、第３図に示
す如く、左バンク３１Ｌの気筒３２Ｌの副掃気ポート３
５Ｃと排気ポート３３Ｌとを結んで定められる掃排気方
向４１Ｌと、右バンク３１Ｒの気筒３２Ｒの副掃気ポー
ト３５Ｃと排気ポート３３Ｒとを結んで定めらる掃排気
方向４１Ｒとを、一方向からみて同じ右上り方向に設定
している。However, for the engine 15, as shown in FIGS. 1 and 3, the auxiliary scavenging port 3 of the cylinder 32L of the left bank 31L is
A scavenging/exhausting direction 41L defined by connecting 5C and the exhaust port 33L, and a scavenging/exhausting direction 41R defined by connecting the auxiliary scavenging port 35C of the cylinder 32R of the right bank 31R and the exhaust port 33R are viewed from one direction. It is set in the same upward right direction.
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.
■容気筒３２の排気ポート３３を両バンク３１Ｌ、３１
Ｒの■溝状中間領域に配置したから、エンジン１５の外
形をコンパクトにすることができる。■Connect the exhaust port 33 of the cylinder 32 to both banks 31L and 31
Since it is arranged in the groove-shaped intermediate region of R, the external shape of the engine 15 can be made compact.
■各気筒３２の主燃焼室３６と点火プラグ３７とを気筒
中心より副掃気ポート３５Ｃ寄りに偏位したから、掃気
ポート３５Ａ〜３５Ｃから流入する新気に早めに着火し
、熱効率の向上と出力の増大を図ることができる。■Since the main combustion chamber 36 and spark plug 37 of each cylinder 32 are offset from the center of the cylinder toward the auxiliary scavenging port 35C, fresh air flowing in from the scavenging ports 35A to 35C is ignited early, improving thermal efficiency and output. It is possible to increase the amount of
■左右いずれか一方のバンク３１Ｌ、３１Ｒのためのシ
リンダヘッド２３を、第３図に矢印で示す如く１８０度
転回し、他方のバンク側に共用しようとする時、該シリ
ンダヘッド２３に設けられる主燃焼室３．６と点火プラ
グ３７は他方のバンクにおいても気筒中心に対する同−
向きに設定されている副掃気ポート３５Ｃ寄りに偏位す
ることとなり、共用可能となる。即ち、両バンク３１Ｌ
、３１Ｒのシリンダヘット２３、ヘッドカバー２４、及
びガスケット３０を互いに共用てきる。■When the cylinder head 23 for either the left or right bank 31L or 31R is rotated 180 degrees as shown by the arrow in FIG. The combustion chamber 3.6 and the spark plug 37 are also located in the same position relative to the center of the cylinder in the other bank.
It will be shifted toward the auxiliary scavenging port 35C, which is set in the direction, so that it can be shared. That is, both banks 31L
, 31R can share the cylinder head 23, head cover 24, and gasket 30 with each other.
上記■〜■により、エンジン１５の外形をコンパクト化
するために左右バンク３１Ｌ、３１Ｒの中間領域に排気
ポート３３を配置し、かっ熱効率の向上と出力の増大を
図るために各気筒３２の主燃焼室３６と点火プラグ３７
とを気筒中心より副掃気ポート３５Ｃ側に偏位せしめる
船外機用Ｖ型２サイクルエンジンを構成するに際し、両
バンク３１Ｌ、３１Ｒのシリンダヘッド２３等を互いに
共用できる。According to the above items 1 to 2, the exhaust port 33 is arranged in the middle area between the left and right banks 31L and 31R in order to make the external shape of the engine 15 more compact, and the main combustion of each cylinder 32 is done in order to improve heat efficiency and increase output. Chamber 36 and spark plug 37
When configuring a V-type two-stroke engine for an outboard motor in which the auxiliary scavenging port 35C is shifted from the center of the cylinder, the cylinder heads 23 and the like of both banks 31L and 31R can be shared with each other.
尚、上記エンジン１５にあっては、ピストン２７のスカ
ート部に、第２図に示す如く、各気筒３２の掃気ポート
３５Ａ〜３５Ｃに対応する主掃気ポート用切欠部２７Ａ
、２７Ｂ、及び副掃気ポート用窓部２７Ｃを備える。In the engine 15, the skirt portion of the piston 27 is provided with main scavenging port notches 27A corresponding to the scavenging ports 35A to 35C of each cylinder 32, as shown in FIG.
, 27B, and a sub-scavenging port window 27C.
この時、上記実施例にあっては、このピストン２７を左
右の両バンク３１Ｌ、３１Ｒで互いに共用できる。即ち
、第１図によって明らかな如く、ピストン２７を左右の
両バンク３１Ｌ、３１Ｒにおいて１８０度転回して用い
ることにより、それらの主掃気ポート用切欠部２７Ａ、
２７Ｂ、副掃気ポート用窓部２７Ｃをいずれのバンクに
おいてもそれらの掃気ポート３５Ａ〜３５Ｃに合致せし
め、それら両バンクで共用てきる。At this time, in the above embodiment, the piston 27 can be shared by both the left and right banks 31L and 31R. That is, as is clear from FIG. 1, by rotating the piston 27 by 180 degrees in both the left and right banks 31L and 31R, the main scavenging port notches 27A,
27B and the sub-scavenging port window 27C are made to match the scavenging ports 35A to 35C in any bank, and can be shared by both banks.
尚、本発明は、シュニーレ掃気式のＶ型２サイクルエン
ジンに限らず、他の掃気方式のＶ型２サイクルエンジン
にも適用できる。Note that the present invention is not limited to a V-type two-stroke engine of Schneeler scavenging type, but can also be applied to a V-type two-stroke engine of other scavenging type.
［発明の効果］
以上のように本発明によれば、エンジンの外形をコンパ
クト化するために左右バンクの中間領域に排気ポートを
配置し、かつ熱効率の向上と出力の増大を図るために各
気筒の主燃焼室と点火プラグとを気筒中心より掃気ポー
ト側に偏位せしめる船外機用Ｖ型２サイクルエンジンを
構成するに際し、両バンクのシリンダヘッド等を互いに
共用できる。[Effects of the Invention] As described above, according to the present invention, the exhaust port is arranged in the intermediate region between the left and right banks in order to make the external shape of the engine more compact, and each cylinder is When configuring a V-type two-stroke engine for an outboard motor in which the main combustion chamber and spark plug are offset from the center of the cylinder toward the scavenging port side, the cylinder heads and the like of both banks can be shared.
第１図は本発明の一実施例に係るエンジンのシリンダブ
ロックを示す正面図、第２図は同エンジンの断面図、第
３図は左右バンクの掃排気方向を示す模式図、第４図は
船外機を示す模式図、第５図は従来の左右バンクの掃排
気方向を示す模式図、第６図は主燃焼室位置と点火プラ
グ位置とを示す模式図である。
１０・・・船外機、
１５・・・エンジン、
３１Ｌ、３１Ｒ・・・バンク、
３２・・・気筒、
３３・・・排気ポート、
３５Ｃ・・・副掃気ポート、
３６・・・主燃焼室、
３７・・・点火プラグ、
４１Ｌ、４１Ｒ・・・掃排気方向。
第３図FIG. 1 is a front view showing a cylinder block of an engine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the same engine, FIG. 3 is a schematic diagram showing the scavenging and exhausting direction of left and right banks, and FIG. FIG. 5 is a schematic diagram showing the conventional left and right bank scavenging and exhausting directions, and FIG. 6 is a schematic diagram showing the main combustion chamber position and the spark plug position. 10... Outboard motor, 15... Engine, 31L, 31R... Bank, 32... Cylinder, 33... Exhaust port, 35C... Sub-scavenging port, 36... Main combustion chamber , 37...Spark plug, 41L, 41R...Scavenging and exhaust direction. Figure 3
Claims (1)
気ポートをそれら両バンクの中間領域に配置し、各気筒
の反排気ポート側に掃気ポートを設け、各気筒の主燃焼
室位置と点火プラグ位置とを気筒中心より掃気ポート寄
りに偏位してなる船外機用Ｖ型２サイクルエンジンにお
いて、左バンクの気筒の掃気ポートと排気ポートとを結
んで定められる掃排気方向と、右バンクの気筒の掃気ポ
ートと排気ポートとを結んで定められる掃排気方向とを
、一方向からみて同じ向きに設定したことを特徴とする
船外機用Ｖ型２サイクルエンジン。(1) The exhaust port of each cylinder provided in the left and right banks forming a V-shape is arranged in the middle area between these two banks, and the scavenging port is provided on the side opposite to the exhaust port of each cylinder, and the main combustion chamber position of each cylinder is In a V-type two-stroke outboard engine in which the spark plug position is shifted toward the scavenging port from the center of the cylinder, the scavenging and exhaust direction is determined by connecting the scavenging port and exhaust port of the left bank cylinder, and the right A V-type two-stroke engine for an outboard motor, characterized in that the scavenging and exhausting directions determined by connecting the scavenging ports and exhaust ports of the cylinders of the bank are set in the same direction when viewed from one direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26823289A JPH03134219A (en) | 1989-10-17 | 1989-10-17 | Two-cycle v-engine for outboard motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26823289A JPH03134219A (en) | 1989-10-17 | 1989-10-17 | Two-cycle v-engine for outboard motor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03134219A true JPH03134219A (en) | 1991-06-07 |
Family
ID=17455741
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26823289A Pending JPH03134219A (en) | 1989-10-17 | 1989-10-17 | Two-cycle v-engine for outboard motor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03134219A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0550052U (en) * | 1991-12-12 | 1993-07-02 | 本田技研工業株式会社 | Crankshaft support structure for vertical engine |
| JPH09256904A (en) * | 1997-03-07 | 1997-09-30 | Honda Motor Co Ltd | Crank shaft supporting structure for vertical engine |
-
1989
- 1989-10-17 JP JP26823289A patent/JPH03134219A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0550052U (en) * | 1991-12-12 | 1993-07-02 | 本田技研工業株式会社 | Crankshaft support structure for vertical engine |
| JPH09256904A (en) * | 1997-03-07 | 1997-09-30 | Honda Motor Co Ltd | Crank shaft supporting structure for vertical engine |
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