JPS63192954A - Multi-cylinder two-cycle engine - Google Patents

Multi-cylinder two-cycle engine

Info

Publication number
JPS63192954A
JPS63192954A JP2333287A JP2333287A JPS63192954A JP S63192954 A JPS63192954 A JP S63192954A JP 2333287 A JP2333287 A JP 2333287A JP 2333287 A JP2333287 A JP 2333287A JP S63192954 A JPS63192954 A JP S63192954A
Authority
JP
Japan
Prior art keywords
chamber
engine
cylinder
intake
case
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
JP2333287A
Other languages
Japanese (ja)
Other versions
JPH07122420B2 (en
Inventor
Mutsuhiro Taneyama
種山　六広
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 JP2333287A priority Critical patent/JPH07122420B2/en
Publication of JPS63192954A publication Critical patent/JPS63192954A/en
Publication of JPH07122420B2 publication Critical patent/JPH07122420B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/104—Intake manifolds
    • F02M35/116—Intake manifolds for engines with cylinders in V-arrangement or arranged oppositely relative to the main shaft
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/1015—Air intakes; Induction systems characterised by the engine type
    • F02M35/1019—Two-stroke engines; Reverse-flow scavenged or cross scavenged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10209—Fluid connections to the air intake system; their arrangement of pipes, valves or the like
    • F02M35/10222—Exhaust gas recirculation [EGR]; Positive crankcase ventilation [PCV]; Additional air admission, lubricant or fuel vapour admission
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/10—Air intakes; Induction systems
    • F02M35/10242—Devices or means connected to or integrated into air intakes; Air intakes combined with other engine or vehicle parts
    • F02M35/10275—Means to avoid a change in direction of incoming fluid, e.g. all intake ducts diverging from plenum chamber at acute angles; Check valves; Flame arrestors for backfire prevention
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
    • F02M35/16—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines characterised by use in vehicles
    • F02M35/162—Motorcycles; All-terrain vehicles, e.g. quads, snowmobiles; Small vehicles, e.g. forklifts
    • 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
    • F02B2075/1808—Number of cylinders two

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)

Abstract

PURPOSE:To aim at reducing the number of parts and at making a multi- cylinder two cycle engine compact by forming a breather chamber for separating oil entrained in exhaust gas in a part of the engine which is conventionally not used, that is, in a part between each adjacent intake-air passages in an upper casing. CONSTITUTION:In a multi-cylinder two cycle engine, a crank chamber is divided into a plurality of subchambers corresponding to a plurality of engine cylinders, and a plurality of intake-air passages 58a, 58b are formed in an upper casing, corresponding to the plurality of subchambers. Further, one end side of the intake-air passages 58a, 58b is communicated with vaporizing pipes through intake-air pipes 60a, 60b. In this arrangement, a breather chamber 65 for separating oil discharged from a mission chamber and entrained in exhaust gas is formed between the intake-air passages 58a, 58b in the upper casing 25. Further, the breather chamber 65 is communicated with the mission chamber through breather passages formed in both upper casing 25 and a lower casing while it is opened to the atmosphere through a drain pipe 67.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は多気筒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 multi-cylinder two-stroke engine.

（従来の技術及び発明が解決しようとする問題点） エンジンケースに複数のシリンダを設け、クランク室を
各シリンダに対応させて複数の室に分割し、この分割さ
れた各室と気化器とをエンジンケースに形成した吸気通
路で連通した多気筒２サイクルエンジンに於いては、プ
リージングにより出てくる気体中に混入した油を分離す
る気液分離室いわゆるブリーザチャンバーを設けたもの
がある。斯かるエンジンでは従来よりエンジンケース外
側にハウジングを取付ける等してブリーザチャンバーを
形成しており、このためエンジンの部品点数の増加及び
にエンジンの大型化を招く等の不具合があった。(Problems to be Solved by the Prior Art and the Invention) A plurality of cylinders are provided in the engine case, the crank chamber is divided into a plurality of chambers corresponding to each cylinder, and each of the divided chambers is connected to a carburetor. Some multi-cylinder two-stroke engines that communicate through an intake passage formed in an engine case are equipped with a gas-liquid separation chamber, a so-called breather chamber, which separates oil mixed into the gas discharged by breathing. Conventionally, in such an engine, a breather chamber has been formed by attaching a housing to the outside of the engine case, etc., and this has resulted in problems such as an increase in the number of engine parts and an increase in the size of the engine.

本発明は斯かる従来の不具合に鑑み成されたものであり
、その目的とする処はブリーザチャンバーを設けつつも
部品点数の削減ならびにコンパクト化を図った多気筒２
サイクルエンジンを提供するにある。The present invention has been made in view of such conventional problems, and its purpose is to provide a multi-cylinder engine 2 that is equipped with a breather chamber while reducing the number of parts and making it more compact.
To provide cycle engines.

（問題点を解決するための手段） 前記問題点を達成するため本発明はエンジンケース（２
４）内にミッション室（３１）とクランク室（３０）と
を形成し、更に該エンジンケース（２４）に複数のシリ
ンダ（３３ａ）　、　（３３ｂ）を設け、前記クランク
室（３０）を各シリンダ（３３ａ）　、　（３３ｂ）　
に対応する複数の室に分割し、前記分割された各室と気
化器（６２）とをエンジンケース（２４）に形成した吸
気通路（５８ａ）。(Means for Solving the Problems) In order to achieve the above problems, the present invention provides an engine case (2
4) A transmission chamber (31) and a crank chamber (30) are formed in the engine case (24), and a plurality of cylinders (33a) and (33b) are provided in the engine case (24), and the crank chamber (30) is connected to each cylinder. (33a), (33b)
An intake passage (58a) is divided into a plurality of chambers corresponding to the above, and each of the divided chambers and a carburetor (62) are formed in the engine case (24).

（５８ｂ）で連通した多気筒２サイクルエンジンに於い
て、前記エンジンケース（２４）の前記吸気通路（５８
ａ）　、　（５８ｂ）間にブリーザチャンバー（６５）
を形成したことを特徴とする。(58b) in the multi-cylinder two-stroke engine, the intake passage (58b) of the engine case (24)
a) Breather chamber (65) between (58b)
It is characterized by the formation of

（作用） 従来利用されていなかったエンジンケースの吸気通路間
にブリーザチャンバーを形成するので、多気筒２サイク
ルエンジンの部品点数の削減、並びにコンパクト化を図
ることができる。(Function) Since a breather chamber is formed between the intake passages of the engine case, which has not been used in the past, it is possible to reduce the number of parts and make the multi-cylinder two-stroke engine more compact.

（実施例） 以下に本説明の好適一実施例を添付図面に基づいて説明
する。(Embodiment) A preferred embodiment of the present description will be described below based on the accompanying drawings.

第１図は自動二輪車の側面図、第２図はエンジンの横断
面図、第３図は縦断面図である。FIG. 1 is a side view of the motorcycle, FIG. 2 is a cross-sectional view of the engine, and FIG. 3 is a vertical cross-sectional view.

図面中、（１）は自動二輪車、（３）　は前輪、（５）
は後輪、（７）は車体フレームで、左右のフロントフォ
ーク（１１）　、　（１１）上には前輪（３）を操舵す
るハンドル（１５）を設け、車体フレーム（ア）後部に
は後輪（５）を懸架するリヤフォーク（１０）を上下に
揺動自在に結合する。In the drawing, (1) is a motorcycle, (3) is a front wheel, and (5) is a motorcycle.
is the rear wheel, (7) is the body frame, left and right front forks (11), a handle (15) is provided on (11) to steer the front wheel (3), and the rear wheel is attached to the rear of the body frame (A). A rear fork (10) that suspends the (5) is coupled to be able to swing up and down.

前記車体フレーム（７）は、ヘッドチューブ（１６）か
ら後方へ延出した上下二本より成るメインバイブ（１８
）と、該メインバイブ（１８）より垂下した左右のダウ
ンチューブ（２０）と、ダウンチューブ（２ｏ）の下端
より後方へ略水平に延出するダウンチューブロア（２１
）、及びダウンチューブロア（２１）後端とメインバイ
ブ（１８）とを連結するセンターチューブ（２２）等か
ら構成される。The body frame (7) has a main vibe (18) consisting of two upper and lower parts extending rearward from the head tube (16).
), left and right down tubes (20) hanging down from the main vibe (18), and a down tube lower (21) extending approximately horizontally rearward from the lower end of the down tube (2o).
), and a center tube (22) that connects the rear end of the down tube lower (21) and the main vibe (18).

前記ダウンチューブロア（２１）上にはエンジン（Ｅ）
を載置する。An engine (E) is mounted on the down tube lower (21).
Place.

該エンジン（Ｅ）はシリンダブロックが側面視でＶ字状
を成すＶ型２気筒２サイクルエンジンで該エンジン（Ｅ
）のエンジンケース（２４）はアッパーケース（２５）
とロアケース（２６）とから構成される。The engine (E) is a V-type two-cylinder two-stroke engine whose cylinder block is V-shaped in side view.
) engine case (24) is the upper case (25)
and a lower case (26).

アッパーケース（２５）とロアケース（２６）間にはこ
れら（２５）　、　（２６）を接合した状態でクランク
室（３０）とミッション室（３１）とが形成され、この
クランク室（３０）とミッション室（３１）とはアッパ
ーケース（２５）とロアケース（２６）に形成した隔壁
（２５ａ）　、　（２６ａ）により隔別されている。A crank chamber (30) and a transmission chamber (31) are formed between the upper case (25) and the lower case (26) by joining these (25) and (26), and the crank chamber (30) and the transmission chamber (31) are formed between the upper case (25) and the lower case (26). The chamber (31) is separated from the chamber (31) by partition walls (25a) and (26a) formed in the upper case (25) and lower case (26).

前記エンジンケース（２４）は、クランク室（３０）が
前輪（３）側に、ミッション室（３１）が後輪（５）側
になるように前後輪（３）　、　（５）間で略水平に配
置される。（第２図中（ＪＺ）は走行路面に平行な線を
示す） 又、エンジンケース（２４）のクランク室（３０）前部
側には側面視Ｖ型を成す２つのシリンダブロック（３３
ａ）　、　（３３ｂ）を上下に形成し、これらシリンダ
ブロック（３３ａ）　、　（３３ｂ）内には夫々ピスト
ン（３５ａ）。The engine case (24) is arranged approximately horizontally between the front and rear wheels (3) and (5) so that the crank chamber (30) is on the front wheel (3) side and the transmission chamber (31) is on the rear wheel (5) side. will be placed in ((JZ) in Fig. 2 indicates a line parallel to the running road surface) In addition, on the front side of the crank chamber (30) of the engine case (24), there are two cylinder blocks (33) forming a V-shape in side view.
a) and (33b) are formed above and below, and a piston (35a) is provided in each of these cylinder blocks (33a) and (33b).

（３５ｂ）を摺動自在に嵌挿し、該ピストン（３５ａ）
。(35b) is slidably inserted into the piston (35a).
.

（３５ｂ）　　と各シリンダブロック（３３ａ）　、　
（ａ：＋ｂ）　に固着したシリンダヘッド（３４ａ）　
、　（３４ｂ）　　との間には燃焼室（３６ａ）　、　
（３６ｂ）を形成する。更にこれらシリンダブロック（
３３ａ）　、　（３３ｂ）には夫々排気通路（３７ａ）
。(35b) and each cylinder block (33a),
(a:+b) Cylinder head (34a) stuck to
, (34b) and a combustion chamber (36a),
(36b) is formed. Furthermore, these cylinder blocks (
33a) and (33b) each have an exhaust passage (37a).
.

（３７ｂ）及び掃気通路（３８ａ）　、　（３８ｂ）を
形成する。シリンダブロック（３３ａ）　、　（３３ｂ
）のうちシリンダブロック（３３ａ）はロアケース（２
６）側に、シリンダブロック（３３ｂ）はアッパーケー
ス（２５）側に形成され、即ちエンジンケース（２４）
をアッパーケス（２５）ロアケース（２６）に分割する
割り面（Ｐ）は上下のシリンダブロック（３＋ｂ）　、
　（３３ａ）の中間で地面と略平行に延出し、エンジン
ケース（２４）は高さの略中心部分で上下２つのケース
に分割されることになる。(37b) and scavenging passages (38a) and (38b). Cylinder block (33a), (33b
), the cylinder block (33a) is attached to the lower case (2
6) side, the cylinder block (33b) is formed on the upper case (25) side, that is, the engine case (24) side.
The dividing surface (P) that divides the upper case (25) and lower case (26) is the upper and lower cylinder blocks (3+b),
(33a) extends substantially parallel to the ground, and the engine case (24) is divided into two upper and lower cases approximately at the center of the height.

一方、前記クランクｍ　（３０）内にはクランク軸（４
０）を、又前記ミッション室（３１）内には歯車変速機
構（４１）を夫々配設する。クランク軸（４ｏ）はその
ジャーナル部がボールベアリング（４１）により回転自
在に支持され、又２つのクランクピン部が前述したピス
トン（３５ａ）　、　（３５ｂ）に夫々コネクティング
ロッド（４５ａ）　、　（４５ｂ）を介して連結される
。又変速歯車機構（４１）はボールベアリング（４１１
）　、　（４９）を介して略平行に支持されたメインシ
ャフト（５ｏ）とカウンタシャフト（５１）から成り、
これらシャフト（５０）　、　（５１）にそれぞれスプ
ライン結合した歯車（５５）　、　（５６）が噛合して
変速段に対応した歯車列を構成している。この歯車変速
機構（４１）は周知のように、歯車（５５）　、　（５
ｆｌ）が図外の変速レバーの操作で各シャフト（５０）
　、　（５１）上を軸方向に摺動し、変速レバーの操作
に応じた歯車列を確立してエンジン動力を変速する。On the other hand, the crankshaft (4) is inside the crank m (30).
0), and a gear transmission mechanism (41) is provided in the mission chamber (31). The crankshaft (4o) has its journal portion rotatably supported by a ball bearing (41), and the two crank pin portions connect to the aforementioned pistons (35a) and (35b), respectively, with connecting rods (45a) and (45b). connected via. In addition, the speed change gear mechanism (41) is equipped with ball bearings (411).
), consisting of a main shaft (5o) and a countershaft (51) supported substantially in parallel via (49),
Gears (55) and (56) spline-coupled to these shafts (50) and (51), respectively, mesh with each other to form a gear train corresponding to the gear position. As is well known, this gear transmission mechanism (41) includes gears (55), (5
fl) is connected to each shaft (50) by operating the gear shift lever (not shown).
, (51) slides in the axial direction on the top, establishes a gear train according to the operation of the speed change lever, and changes the speed of the engine power.

本実施例では第５図に示すようにアッパーケース（２５
）とロアケース（２６）とをボルト（７０）、　　（７
１）にて締着している。このうちボルト（７０）はロア
ケース（２６）の隔壁（２６ａ）に形成したボルト孔（
２８ａｌ）およびアッパーケース（２５）の隔壁（２５
ａ）に形成したボルト孔（２５ａｌ）に螺合し、一方ボ
ルト（７１）はロアケース（２６）の掃気通路（３８ａ
）内からアッパーケース（２５）に向けて形成したボル
ト孔（２６ａ２）及びアッパーケース（２５）に形成し
たボルト孔（２５ａ２）に螺合し、以上によりアッパー
ケース（２５）とロアケース（２６）が締着される。In this embodiment, the upper case (25
) and lower case (26) with bolts (70), (7
1) is tightened. Among these bolts (70) are bolt holes (
28al) and the bulkhead (25al) of the upper case (25)
a), and the bolt (71) is screwed into the scavenging passage (38a) of the lower case (26).
) into the bolt hole (26a2) formed toward the upper case (25) and the bolt hole (25a2) formed in the upper case (25), and as a result of the above, the upper case (25) and lower case (26) are connected. It is fastened.

尚、（７５）はミッション室（３１）土壁に形成したオ
イル通路である。Note that (75) is an oil passage formed in the earthen wall of the mission chamber (31).

ところでこのエンジン（Ｅ）は２気筒２サイクルエンジ
ンなので、クランク室（３０）は各気筒に対応して２つ
の室に分割されており、アッパーケース（２５）には第
４図に詳伝するようにこの各室に対応して２つの吸気通
路（５８ａ）　、　（５８ｂ）が略平行に形成されてい
る。この吸気通路（５８ａ）　、　（５８ｂ）はその一
端が前述の分割された室に夫々開口し、他端側が吸気管
（８０ａ）　、　（６０ｂ）を介して気化管（６２）に
連絡している。又、前記吸気通路（５８ａ）　、　（５
８ｂ）にはリードバルブ（６３ａ）　、　（６３ｂ）が
設けられ、（８４ａ）　、　（６４ｂ）はそのストッパ
ーである。By the way, this engine (E) is a two-cylinder two-stroke engine, so the crank chamber (30) is divided into two chambers corresponding to each cylinder, and the upper case (25) has a Two intake passages (58a) and (58b) are formed substantially parallel to each chamber. One end of the intake passages (58a) and (58b) opens into the aforementioned divided chambers, and the other end communicates with the vaporization pipe (62) via the intake pipes (80a) and (60b). . Further, the intake passage (58a), (5
8b) is provided with reed valves (63a) and (63b), and (84a) and (64b) are stoppers thereof.

前記アッパーケース（２５）の吸気通路（５８ａ）。An intake passage (58a) of the upper case (25).

（５８ｂ）間にはミッション室（３１）から排出される
排気中に歯車等により攪拌されて混入した油を分離する
ブリーザチャンバー（６５）を形成し、該チャンバー（
６５）はアッパーケース（２５）、ロアケース（２８〉
に形成したブリーザ通路（６６）によりミッション室（
３１）に連通し、またその一方で、ドレン管（６７）に
より大気に開放されている。(58b) A breather chamber (65) is formed between the transmission chamber (31) to separate oil mixed into the exhaust gas discharged from the mission chamber (31) by being stirred by a gear or the like.
65) are upper case (25), lower case (28)
The breather passage (66) formed in the mission chamber (
31), and on the other hand, it is open to the atmosphere through a drain pipe (67).

以上に於いて、本実施例では排気中の油を分離するブリ
ーザチャンバー（６５）をアッパーケース（２５）の吸
気通路（５８ａ）　、　（５８ｂ）間、即ちエンジンケ
ース（２４）の従来利用されていなかった部分に形成し
ており、このためブリーザチャンバー（６５）を形成す
るにあたり、従来のようにエンジンケースの外側にハウ
ジング等を設ける必要がなくなり、エンジンの部品点数
の削減並びにコンパクト化を図ることができる。In the above, in this embodiment, the breather chamber (65) for separating oil in the exhaust gas is used between the intake passages (58a) and (58b) of the upper case (25), that is, the engine case (24). Therefore, when forming the breather chamber (65), there is no need to provide a housing etc. on the outside of the engine case as in the conventional case, and the number of parts of the engine can be reduced and the engine can be made more compact. Can be done.

（発明の効果） 以上に述べたように本発明によれば、従来利用されてい
なかったエンジンケースの吸気通路間にブリーザチャン
バーを形成するので、多気筒２サイクルエンジンの部品
点数の削減、並びにコンパクト化を図ることができる。(Effects of the Invention) As described above, according to the present invention, a breather chamber is formed between the intake passages of the engine case, which has not been used in the past, so the number of parts in a multi-cylinder two-stroke engine can be reduced and the engine can be made more compact. It is possible to aim for

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は自動二輪車の側面図、第２図はエンジンの横断
面図、第３図は同縦断面図、第４図は第２図のＩＶ−Ｉ
Ｖ線断面図、第５図はアッパーケースとロアケースとの
接合状態を示す要部拡大断面図である。 尚、図面中、（２４）はエンジンケース、（３０）はク
ランク室、（３！）はミッション室、（３３ａ）　、　
（３３ｂ）はシリンダ、（５８ａ）　、　（５８ｂ）は
吸気通路、（６２）は気化管、　（６５）はブリーザチ
ャンバーである。Fig. 1 is a side view of the motorcycle, Fig. 2 is a cross-sectional view of the engine, Fig. 3 is a longitudinal sectional view of the same, and Fig. 4 is IV-I of Fig. 2.
A sectional view taken along the line V, and FIG. 5 is an enlarged sectional view of a main part showing a joined state of an upper case and a lower case. In addition, in the drawing, (24) is the engine case, (30) is the crank chamber, (3!) is the mission chamber, (33a),
(33b) is a cylinder, (58a) and (58b) are intake passages, (62) is a vaporizing pipe, and (65) is a breather chamber.

Claims (1)

【特許請求の範囲】[Claims] エンジンケース内にミッション室とクランク室とを形成
し、更に該エンジンケースに複数のシリンダを設け、前
記クランク室を各シリンダに対応する複数の室に分割し
、前記分割された各室と気化器とをエンジンケースに形
成した吸気通路で連通した多気筒２サイクルエンジンに
於いて、前記エンジンケースの前記吸気通路間にブリー
ザチャンバーを形成したことを特徴とする多気筒２サイ
クルエンジン。A transmission chamber and a crank chamber are formed in an engine case, a plurality of cylinders are further provided in the engine case, the crank chamber is divided into a plurality of chambers corresponding to each cylinder, and each divided chamber and a carburetor are connected to each other. What is claimed is: 1. A multi-cylinder two-stroke engine in which a breather chamber is formed between the intake passages of the engine case, in which the two-stroke engines communicate with each other through an intake passage formed in an engine case.
JP2333287A 1987-02-03 1987-02-03 Multi-cylinder 2-cycle engine Expired - Lifetime JPH07122420B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2333287A JPH07122420B2 (en) 1987-02-03 1987-02-03 Multi-cylinder 2-cycle engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2333287A JPH07122420B2 (en) 1987-02-03 1987-02-03 Multi-cylinder 2-cycle engine

Publications (2)

Publication Number Publication Date
JPS63192954A true JPS63192954A (en) 1988-08-10
JPH07122420B2 JPH07122420B2 (en) 1995-12-25

Family

ID=12107627

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2333287A Expired - Lifetime JPH07122420B2 (en) 1987-02-03 1987-02-03 Multi-cylinder 2-cycle engine

Country Status (1)

Country Link
JP (1) JPH07122420B2 (en)

Also Published As

Publication number Publication date
JPH07122420B2 (en) 1995-12-25

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