JPH0129984B2

JPH0129984B2 -

Info

Publication number: JPH0129984B2
Application number: JP58186585A
Authority: JP
Inventors: Shinji Shudo
Original assignee: Kawasaki Heavy Industries Ltd
Current assignee: Kawasaki Heavy Industries Ltd
Priority date: 1983-10-04
Filing date: 1983-10-04
Publication date: 1989-06-15
Also published as: JPS6079146A

Description

【発明の詳細な説明】（産業上の利用分野）本発明はシリンダを前後に２個あるいは前後左
右にスクエア形に４個配置し、各シリンダを上端
部が自動２輪車の前側にくるように傾斜し、エン
ジンの前上方にエアクリーナを配置する縦置２気
筒あるいは縦置スクエヤ配置型４気筒エンジンに
関する。Detailed Description of the Invention (Field of Industrial Application) The present invention is characterized by arranging two cylinders in the front and rear or four cylinders in a square shape in the front, rear, left and right, and placing each cylinder so that its upper end is on the front side of the motorcycle. This relates to a vertical two-cylinder or vertical square four-cylinder engine with an air cleaner located above and in front of the engine.

（従来技術）キヤブレターの吸気通路管はシリンダの中心線
に対してエンジン側方へ略直角方向に配置されて
いる。そのためにキヤブレターの吸気通路管とエ
アクリーナとを接続するゴムダクトを長くしなけ
ればならず、またゴムダクトをエアクリーナ側へ
と大きく湾曲させなければならない。それにより
吸気に対するゴムダクトの流路抵抗が大きくな
く、良好なエンジン性能が得られない。(Prior Art) The intake passage pipe of a carburetor is arranged approximately perpendicularly to the side of the engine with respect to the center line of the cylinder. For this purpose, the rubber duct that connects the intake passage pipe of the carburetor and the air cleaner must be made longer, and the rubber duct must be greatly curved toward the air cleaner side. As a result, the flow path resistance of the rubber duct against intake air is not large, and good engine performance cannot be obtained.

（発明の目的）キヤブレターの吸気通路管からエアクリーナま
での吸気通路が短くかつ略直線状になるようにす
ることにより、吸気に対する流路抵抗を大幅に減
少し、エンジン性能を向上させることである。(Objective of the Invention) It is an object of the present invention to significantly reduce flow resistance to intake air and improve engine performance by making the intake passage from the intake passage pipe of the carburetor to the air cleaner short and substantially straight.

（発明の構成）エンジン中心線を通る垂直面と略平行なエンジ
ン側方の垂直面内にキヤブレターの吸気通路管を
配置し、吸気通路管の入口部を前上方のエアクリ
ーナ側に向けている。(Structure of the Invention) The intake passage pipe of the carburetor is arranged in a vertical plane on the side of the engine that is substantially parallel to the vertical plane passing through the engine center line, and the inlet portion of the intake passage pipe is directed toward the air cleaner side in the upper front direction.

（実施例）第１図は本発明を適用した２気筒縦置エンジン
の右側面図であり、例えば自動２輪車に搭載され
る。この第１図において、各シリンダ１，２は前
後に並ぶように配置されると共に、上端部が前側
にくるように傾斜しており、また両シリンダ１，
２用の一体形シリンダヘツド３が上端部に固着さ
れている。シリンダヘツド３の前上方にはエアク
リーナ５が配置されている。７はクラツチカバー
である。(Example) FIG. 1 is a right side view of a two-cylinder vertical engine to which the present invention is applied, and is mounted on, for example, a two-wheeled motor vehicle. In FIG. 1, the cylinders 1 and 2 are arranged one behind the other, and are inclined so that their upper ends are on the front side.
An integral cylinder head 3 for 2 is fixed to the upper end. An air cleaner 5 is arranged above and in front of the cylinder head 3. 7 is a clutch cover.

前側シリンダ１用のキヤブレター８は吸気通路
管１０を備え、吸気通路管１０の中心線O₁₀は、
シリンダ１の中心線O₁を通る垂直面（鉛直面）
と略平行なシリンダ側方の垂直面（第１図の紙面
と平行な面）内に位置しており、吸気通路管１０
の入口部１０ａは前上方のエアクリーナ５側に向
いている。吸気通路管入口部１０ａは概ね直線状
に近い短いゴムダクト１１によりエアクリーナ５
に接続している。吸気通路管１０の出口部はホル
ダー１２に接続し、ホルダー１２はリードバルブ
ケース１３に接続している。リードバルブケース
１３はクラツチカバー７に固着され、クランクケ
ース内（予圧縮室）に連通している。 The carburetor 8 for the front cylinder 1 includes an intake passage pipe 10, and the center line O ₁₀ of the intake passage pipe 10 is
Vertical plane passing through the center line O ₁ of cylinder 1 (vertical plane)
It is located in a vertical plane on the side of the cylinder (a plane parallel to the plane of the paper in FIG. 1) that is approximately parallel to
The inlet portion 10a faces toward the front upper air cleaner 5 side. The intake passage pipe entrance part 10a is connected to the air cleaner 5 by a short rubber duct 11 that is almost linear.
is connected to. The outlet of the intake passage pipe 10 is connected to a holder 12, and the holder 12 is connected to a reed valve case 13. The reed valve case 13 is fixed to the clutch cover 7 and communicates with the inside of the crankcase (precompression chamber).

キヤブレター８は例えばフロート式であつて、
ピストンバルブ部８ａ及びフロート室８ｂ等を備
えている。１４はケーブルであつて、バルブ８ａ
内のピストンを操作する。 The carburetor 8 is, for example, a float type,
It includes a piston valve portion 8a, a float chamber 8b, and the like. 14 is a cable, which connects the valve 8a
Operate the piston inside.

第２図は第１図の−断面部分図を示してお
り、シリンダ中心線O₁を通る垂直面（第２図の
紙面と直角の垂直面）とキヤブレター吸気通路管
１０の中心線O₁₀を通る垂直面（第２図の紙面と
直角の垂直面）が平行であることを明確にしてい
る。１６はリードバルブであり、リードバルブケ
ース１３内に設けられている。１７はピストン、
１８は燃焼室である。 FIG. ₂ shows a partial cross-sectional view of FIG _. It is made clear that the vertical planes passing through (the vertical planes perpendicular to the plane of the paper in Figure 2) are parallel. 16 is a reed valve, which is provided inside the reed valve case 13. 17 is a piston,
18 is a combustion chamber.

なお第１図の後側シリンダ２用のキヤブレター
８′、吸気通路管１０′及びリードバルブケース１
３′等の配置及び構造は前側シリンダ１の場合と
同様である。即ちシリンダ２の中心線O₂を通る
垂直面とキヤブレター吸気通路管１０′の中心線
O′₁₀を通る垂直面は互いに略平行になつており、
吸気管１０′の入口部１０′ａは前上方のエアクリ
ーナ５に向いている。またゴムダクト１１′は短
く形成されており、概ね直線状に近く形成されて
いる。 In addition, the carburetor 8', intake passage pipe 10', and reed valve case 1 for the rear cylinder 2 in Figure 1.
The arrangement and structure of parts 3' and the like are the same as in the case of the front cylinder 1. That is, the vertical plane passing through the center line _O2 of the cylinder 2 and the center line of the carburetor intake passage pipe 10'
The vertical planes passing through O′ ₁₀ are approximately parallel to each other,
An inlet portion 10'a of the intake pipe 10' faces toward the air cleaner 5 in the upper front direction. Further, the rubber duct 11' is formed short and approximately linear.

（作用）吸気はエアクリーナ５から各ゴムダクト１１，
１１′を通つてキヤブレター８，８′の吸気通路管
１０，１０′内に入り、通路管１０，１０′内で燃
料と混合し、リードバルブ１６を通過してクラツ
チカバー７内に入る。そしてクラツチカバー７内
から各シリンダ１，２の掃気通路２０（第２図）
を介して各シリンダ１，２の燃焼室１８に供給さ
れる。(Function) Air is taken from the air cleaner 5 to each rubber duct 11,
It enters the intake passage pipes 10, 10' of the carburetors 8, 8' through 11', mixes with fuel in the passage pipes 10, 10', passes through the reed valve 16, and enters the clutch cover 7. Then, from inside the clutch cover 7, the scavenging passages 20 of each cylinder 1, 2 (Fig. 2)
It is supplied to the combustion chamber 18 of each cylinder 1, 2 via.

（別の実施例） (イ) 前述の実施例のようなリードバルブ方式の代
りにロータリバルブ方式のエンジンに適用す
る。(Another Embodiment) (a) The present invention is applied to a rotary valve type engine instead of the reed valve type engine as in the previous embodiment.

(ロ) シリンダから直線に混合気を吸入するエンジ
ンに適用する。(b) Applicable to engines that suck air-fuel mixture straight from the cylinder.

(ハ) シリンダを前後に各一対備えた４気筒エンジ
ンに適用する。(c) Applicable to 4-cylinder engines with a pair of cylinders at the front and rear.

(ニ) キヤブレターがシリンダ軸と若干傾いた平面
に位置する構造。(d) A structure in which the carburetor is located on a plane slightly inclined to the cylinder axis.

（発明の効果）シリンダ中心線を通る垂直面と略平行なエンジ
ン側方の垂直面内にキヤブレターの吸気通路管を
配置し、吸気通路管の入口部を前上方のエアクリ
ーナ側に向けているので、エアクリーナからキヤ
ブレター吸気通路管に至る吸気通路（ゴムダクト
等）が短くかつ直線に近い状態になる。それによ
り吸気通路の流路抵抗が大幅に減少し、エンジン
性能が向上する。またエンジン全体がコンパクト
になる。(Effects of the Invention) The intake passage pipe of the carburetor is arranged in a vertical plane on the side of the engine that is approximately parallel to the vertical plane passing through the cylinder centerline, and the inlet of the intake passage pipe is directed toward the front upper air cleaner side. , the intake passage (rubber duct, etc.) from the air cleaner to the carburetor intake passage pipe becomes short and nearly straight. This significantly reduces flow resistance in the intake passage and improves engine performance. Also, the entire engine becomes more compact.

また自動２輪車に搭載されるエンジンにおい
て、キヤブレター８，８′を吸気通路管１０，１
０′と共にエンジンの側方に配置しているので、
キヤブレター８を外部から点検し易く、組み付け
も容易である。 In addition, in the engine mounted on a two-wheeled motor vehicle, the carburetor 8, 8' is connected to the intake passage pipe 10, 1.
Since it is located on the side of the engine along with 0',
The carburetor 8 can be easily inspected from the outside and can be easily assembled.

本発明の効果をより詳しく説明すると、本発明
は、特にエアクリーナ５をエンジンの前上方に配
置し、シリンダを前後に２個あるいは前後左右に
スクエア形に４個配置した自動２輪車用の縦置２
気筒あるいは縦置スクエヤ配置型４気筒エンジン
に適用されるものである。 To explain the effects of the present invention in more detail, the present invention is particularly applicable to a vertical motorcycle for a motorcycle in which the air cleaner 5 is disposed above the front of the engine, and two cylinders are disposed in the front and rear, or four cylinders are disposed in a square shape in the front, rear, left and right sides. Place 2
It is applied to cylinder or vertical square arrangement type four-cylinder engines.

このようなエンジンにおいて、キヤブレター
８，８′及びこれに結合される吸気通路管１０，
１０′を前後の各シリンダの同一側の側方に配置
すると共に、シリンダ中心線を通る垂直面と略平
行なエンジン側方の垂直面内に上記吸気通路管１
０，１０′を位置させ、吸気通路管の入口部を前
上方のエアクリーナ側に向けることにより、キヤ
ブレター８とエアクリーナ５との間の吸気通路を
効率良く直線状にかつ短くでき、それによりエン
ジン性能の向上及びエンジンのコンパクト化を達
成しているのである。 In such an engine, the carburetor 8, 8' and the intake passage pipe 10 connected thereto,
10' is arranged on the same side of the front and rear cylinders, and the intake passage pipe 1 is arranged in a vertical plane on the side of the engine that is substantially parallel to a vertical plane passing through the cylinder center line.
By locating 0 and 10' and directing the inlet of the intake passage pipe toward the front upper air cleaner side, the intake passage between the carburetor 8 and the air cleaner 5 can be efficiently made straight and short, which improves engine performance. This has resulted in improved performance and a more compact engine.

また上方に延びるピストンバルブ部８ａ，８
a′を備えた前後のキヤブレター８，８′の配置に
関し、シリンダの同一側方内において、前側キヤ
ブレター８を前下方に位置させ、後側キヤブレタ
ー８′を後上方に位置させているので、例えば前
後のキヤブレターを同一高さに配列する場合に比
べると、前後の狭い同一側方面内において、スペ
ースを有効に利用してコンパクトに両キヤブレタ
ー８，８′を配置できる。 Moreover, the piston valve portions 8a, 8 extending upwardly
Regarding the arrangement of the front and rear carburetors 8 and 8' equipped with a', within the same side of the cylinder, the front carburetor 8 is located at the lower front and the rear carburetor 8' is located at the upper rear, so for example Compared to the case where the front and rear carburetors are arranged at the same height, both the front and rear carburetors 8, 8' can be arranged compactly within the same narrow lateral plane by effectively utilizing the space.

[Brief explanation of drawings]

第１図は本発明を適用した２気筒２サイルク型
縦置エンジンの右側面図、第２図は第１図の−
断面図である。１，２…シリンダ、５…エアク
リーナ、８，８′…キヤブレター、１０，１０′…
吸気通路管、１０ａ，１０′ａ…入口部。 Fig. 1 is a right side view of a two-cylinder, two-cycle vertical engine to which the present invention is applied, and Fig. 2 is a -
FIG. 1, 2... Cylinder, 5... Air cleaner, 8, 8'... Carburetor, 10, 10'...
Intake passage pipe, 10a, 10'a...inlet part.

Claims

[Claims]

1 A two-wheeled motor vehicle in which two cylinders are arranged in the front and rear, or four cylinders are arranged in a square shape on the front, rear, left and right sides, each cylinder is tilted so that the upper end is on the front side of the motorcycle, and an air cleaner is arranged above and in front of the engine. In a vertical two-cylinder or vertical square four-cylinder engine for a car, front and rear carburetors 8, 8' and front and rear intake passage pipes 10, 1 connected thereto.
0' is located on the same side of the front and rear cylinders 1 and 2, the front carburetor 8 is located at the lower front, and the rear carburetor 8' is located at the upper rear.
Each carburetor 8, 8' is provided with a piston valve portion 8a, 8a' extending upward, respectively, and the intake passage pipe 10, 10' is positioned in a vertical plane on the side of the engine that is substantially parallel to a vertical plane passing through the cylinder centerline. let me,
The inlet portions of the intake passage pipes 10, 10' are directed upward toward the front air cleaner side, and the intake passage pipes 10, 10' are
A carburetor arrangement structure for a vertical engine, characterized in that an inlet portion of the carburetor is connected to an air cleaner 5 through ducts 11 and 11'.