JPH08218936A - Scavenging chamber structure of two-cycle engine - Google Patents
Scavenging chamber structure of two-cycle engineInfo
- Publication number
- JPH08218936A JPH08218936A JP2979395A JP2979395A JPH08218936A JP H08218936 A JPH08218936 A JP H08218936A JP 2979395 A JP2979395 A JP 2979395A JP 2979395 A JP2979395 A JP 2979395A JP H08218936 A JPH08218936 A JP H08218936A
- Authority
- JP
- Japan
- Prior art keywords
- scavenging
- scavenging chamber
- chamber
- engine
- ports
- 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
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
- F02B75/02—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
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
【0001】[0001]
【産業上の利用分野】この発明は、2サイクルエンジン
における掃気室の構造に関するもので、特に掃気室の空
間形状をより有利な状態にするような分野で利用される
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the structure of a scavenging chamber in a two-stroke engine, and is particularly used in the field of making the spatial shape of the scavenging chamber more advantageous.
【0002】[0002]
【従来の技術】従来の技術を説明する前に、この発明が
適用される2サイクルエンジンを図3にしたがって説明
すると、このエンジンはユニフロ−式のものであって、
シリンダブロック1内にシリンダライナ2が挿入され、
そこに複数個の掃気ポ−ト3が開口させてある。シリン
ダブロック1に形成した掃気室4は掃気ポ−ト3の周囲
を包囲するような形態とされている。シリンダヘッド5
は後述のボルトでシリンダブロック1に固定してあり、
排気ポ−ト6と排気弁7を有している。なお、符号8と
9はそれぞれピストンとコンロッドである。このような
形式のエンジンは実開昭63−115529号公報、実
開昭62−133945号公報等に開示されている。図
4および図5にしたがってシリンダヘッド固定用のボル
ト10について説明すると、このボルト10は掃気室4
の近傍に配置させてあるので、掃気室4の空間に***し
たような状態でボス部11を形成し、このボス部11に
ボルト10を貫通させてある。2. Description of the Related Art Before describing the prior art, a two-cycle engine to which the present invention is applied will be described with reference to FIG. 3, which is a uniflow type engine.
The cylinder liner 2 is inserted into the cylinder block 1,
A plurality of scavenging ports 3 are opened there. The scavenging chamber 4 formed in the cylinder block 1 is configured to surround the scavenging port 3. Cylinder head 5
Is fixed to the cylinder block 1 with bolts described later,
It has an exhaust port 6 and an exhaust valve 7. Reference numerals 8 and 9 are a piston and a connecting rod, respectively. Engines of this type are disclosed in Japanese Utility Model Laid-Open Nos. 63-15529 and 62-133945. The bolt 10 for fixing the cylinder head will be described with reference to FIG. 4 and FIG.
Since it is arranged in the vicinity of, the boss portion 11 is formed in a state of being raised in the space of the scavenging chamber 4, and the bolt 10 is passed through the boss portion 11.
【0003】[0003]
【発明が解決しようとする課題】上述のような従来技術
においては、ボス部11が掃気室4の掃気空間内に***
しているので、所要の通路断面積が確保できなくなる。
そこで、この***した部分をなくすためにボルト10を
シリンダの直径方向に後退させると、結果としてボルト
10のピッチA,B(図1参照)が大きくなる。このよ
うなピッチ拡大はシリンダヘッドやシリンダブロックの
外形寸法を拡大させる要因となり、エンジン全体のコン
パクト化にとって好ましくない。さらに、上記のピッチ
拡大は、シリンダヘッドとシリンダブロックとの密着シ
−ル性や結合剛性を低下させる要因となり、やはり好ま
しいとはいえない。さらに、重要視するべき点は掃気室
4内における掃気流ができるだけスム−ズに攪乱される
ことなく挙動し、エンジンの性能を満足するだけの十分
な掃気室の容量を確保する必要があるにもかかわらず、
この従来技術であれば、図示のような構造であるから、
これらの重要項目が実現できないという問題がある。In the prior art as described above, since the boss portion 11 is raised in the scavenging space of the scavenging chamber 4, it becomes impossible to secure a required passage sectional area.
Therefore, when the bolt 10 is retracted in the diametrical direction of the cylinder in order to eliminate the raised portion, the pitches A and B (see FIG. 1) of the bolt 10 are increased as a result. Such an increase in pitch causes an increase in the outer dimensions of the cylinder head and the cylinder block, which is not preferable for downsizing the entire engine. Furthermore, the above-described pitch expansion is a factor that reduces the sealability between the cylinder head and the cylinder block and the joint rigidity, which is also not preferable. Furthermore, the important point is that the scavenging air in the scavenging chamber 4 behaves as smoothly as possible without being disturbed, and it is necessary to secure a sufficient scavenging chamber capacity to satisfy the engine performance. Nevertheless,
With this conventional technology, since the structure is as shown in the figure,
There is a problem that these important items cannot be realized.
【0004】[0004]
【課題を解決するための手段とその作用】本発明は、以
上に述べた問題点を解決するために発案されたもので、
掃気ポ−トの周囲に掃気室を備えた2サイクルエンジン
において、シリンダヘッド固定用のボルトが掃気室の内
面に形成した凹部内を貫通していることを特徴とするも
ので、こうすることによって、前述のような***したボ
ス部を廃止するのである。Means for Solving the Problem and Its Action The present invention was devised to solve the above-mentioned problems.
In a two-cycle engine having a scavenging chamber around a scavenging port, a bolt for fixing a cylinder head is characterized by passing through a recess formed on the inner surface of the scavenging chamber. , The raised boss part as mentioned above is abolished.
【0005】[0005]
【実施例】以下、図1および図2に示した実施例につい
て説明するが、図3〜図5において説明した部位と同じ
機能を果たす部材については、同じ符号を図中に記載し
て詳細な説明は省略してある。図1は、図3の(1)−
(1)断面の要領で示した横断平面図であり、掃気室4
の内面から縦方向すなわちピストンのストロ−ク方向に
沿って窪ませた凹部12を設け、ここにボルト10を貫
通させてある。なお、符号13は掃気室4へ空気を供給
する給気口であり、掃気ポンプ(図示していない)に接
続されている。図2において、掃気ポ−ト3は掃気室4
の上側に片寄せて配置してあり、こうすることによっ
て、掃気ポ−ト3がシリンダライナ2の直径方向に明け
られていてもシリンダライナ2の上方に向かう掃気流入
が得られる。また、図示していないが、この掃気ポ−ト
3を掃気室4の下側に片寄せて開口させておくと、今度
は、下向きの掃気流入が得られる。なお、実施例のエン
ジンは水冷式であり、符号14はそのためのウオ−タジ
ャケットを示している。また、符号15は掃気室4の内
面を示しており、この内面はシリンダライナ2に沿った
円筒面の形態とされている。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments shown in FIGS. 1 and 2 will be described below. For members having the same functions as those shown in FIGS. 3 to 5, the same reference numerals are given in the drawings for detailed description. The description is omitted. FIG. 1 shows (1)-of FIG.
(1) It is a cross-sectional plan view shown in the form of a cross section, showing a scavenging chamber 4
A recess 12 is formed by denting it from the inner surface in the longitudinal direction, that is, along the stroke direction of the piston, and a bolt 10 is inserted therethrough. Reference numeral 13 is an air supply port that supplies air to the scavenging chamber 4, and is connected to a scavenging pump (not shown). In FIG. 2, the scavenging port 3 is a scavenging chamber 4
Of the scavenging port 3 in the diametrical direction of the cylinder liner 2 so that the scavenging gas inflow toward the upper side of the cylinder liner 2 can be obtained. Further, although not shown, if the scavenging port 3 is biased to the lower side of the scavenging chamber 4 and opened, a downward scavenging inflow can be obtained this time. The engine of the embodiment is water-cooled, and reference numeral 14 indicates a water jacket therefor. Further, reference numeral 15 indicates an inner surface of the scavenging chamber 4, and this inner surface is in the form of a cylindrical surface along the cylinder liner 2.
【0006】[0006]
【発明の効果】本発明によれば、シリンダヘッド固定用
のボルトが掃気室の内面に形成した凹部内に配置されて
いるものであるから、ボルト自体を掃気室の空間に突出
させるようなことがなく、十分な掃気室の容量を確保で
き、掃気室の空気流に乱流を生じさせたりしないで、エ
ンジンの掃気効率をより高めることができる。図4のよ
うに***したボス部を廃止して凹部内にボルトを配置す
るものであるから、ボルトの位置すなわちボルトピッチ
を拡大せずに対応することが可能となり、前述の「密着
シ−ル性」や「結合剛性」面の問題を回避することが出
来るとともに、エンジン全体をコンパクトに構成するこ
とができる。According to the present invention, since the bolt for fixing the cylinder head is arranged in the recess formed on the inner surface of the scavenging chamber, the bolt itself can be projected into the space of the scavenging chamber. Therefore, it is possible to secure a sufficient capacity of the scavenging chamber, and to further improve the scavenging efficiency of the engine without causing turbulence in the air flow in the scavenging chamber. As shown in FIG. 4, the raised boss portion is eliminated and the bolts are arranged in the recesses. Therefore, it is possible to deal with the bolt positions, that is, the bolt pitch without enlarging. It is possible to avoid problems in terms of "property" and "coupling rigidity", and to make the entire engine compact.
【図1】本発明の実施例を示す横断平面図である。FIG. 1 is a cross-sectional plan view showing an embodiment of the present invention.
【図2】図1の(2)−(2)断面図である。FIG. 2 is a sectional view taken along line (2)-(2) of FIG.
【図3】本発明が適用されるエンジンの縦断側面図であ
る。FIG. 3 is a vertical sectional side view of an engine to which the present invention is applied.
【図4】従来技術の部分的な横断平面図である。FIG. 4 is a partial transverse plan view of the prior art.
【図5】図4の(5)−(5)断面図である。5 is a sectional view taken along line (5)-(5) of FIG.
3 掃気ポ−ト 4 掃気室 10 ボルト 12 凹部 3 Scavenging port 4 Scavenging chamber 10 Volt 12 Recess
Claims (1)
イクルエンジンにおいて、シリンダヘッド固定用のボル
トが掃気室の内面に形成した凹部内を貫通していること
を特徴とする2サイクルエンジンの掃気室構造。1. A two-cycle engine having a scavenging chamber around a scavenging port, wherein a cylinder head fixing bolt penetrates a recess formed in the inner surface of the scavenging chamber. Engine scavenging chamber structure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2979395A JPH08218936A (en) | 1995-02-17 | 1995-02-17 | Scavenging chamber structure of two-cycle engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2979395A JPH08218936A (en) | 1995-02-17 | 1995-02-17 | Scavenging chamber structure of two-cycle engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH08218936A true JPH08218936A (en) | 1996-08-27 |
Family
ID=12285884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2979395A Pending JPH08218936A (en) | 1995-02-17 | 1995-02-17 | Scavenging chamber structure of two-cycle engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH08218936A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103061862A (en) * | 2012-12-18 | 2013-04-24 | 宁波大叶园林设备有限公司 | Two-stroke gasoline engine with scavenging passage ports for emission reduction of logarithmic differentiation equation turbulent flow channeling pieces |
CN103122787A (en) * | 2013-01-05 | 2013-05-29 | 宁波大叶园林设备有限公司 | Two-stroke gasoline engine with two auxiliary air ports for narrowing left box seat and right box seat and capable of reducing emission |
JP2020002915A (en) * | 2018-06-29 | 2020-01-09 | 株式会社クボタ | Intake manifold |
-
1995
- 1995-02-17 JP JP2979395A patent/JPH08218936A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN103061862A (en) * | 2012-12-18 | 2013-04-24 | 宁波大叶园林设备有限公司 | Two-stroke gasoline engine with scavenging passage ports for emission reduction of logarithmic differentiation equation turbulent flow channeling pieces |
CN103061862B (en) * | 2012-12-18 | 2014-12-31 | 宁波大叶园林设备有限公司 | Two-stroke gasoline engine with scavenging passage ports for emission reduction of logarithmic differentiation equation turbulent flow channeling pieces |
CN103122787A (en) * | 2013-01-05 | 2013-05-29 | 宁波大叶园林设备有限公司 | Two-stroke gasoline engine with two auxiliary air ports for narrowing left box seat and right box seat and capable of reducing emission |
JP2020002915A (en) * | 2018-06-29 | 2020-01-09 | 株式会社クボタ | Intake manifold |
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