JPS5928102Y2 - Cylinder cooling accelerator for air-cooled two-stroke engines - Google Patents
Cylinder cooling accelerator for air-cooled two-stroke enginesInfo
- Publication number
- JPS5928102Y2 JPS5928102Y2 JP2653679U JP2653679U JPS5928102Y2 JP S5928102 Y2 JPS5928102 Y2 JP S5928102Y2 JP 2653679 U JP2653679 U JP 2653679U JP 2653679 U JP2653679 U JP 2653679U JP S5928102 Y2 JPS5928102 Y2 JP S5928102Y2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- cooled
- air
- cooling
- cylinder head
- 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.)
- Expired
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)
Description
【考案の詳細な説明】
この考案は、空冷2サイクルエンジンのシリンダ冷却促
進装置に関する。[Detailed Description of the Invention] This invention relates to a cylinder cooling promotion device for an air-cooled two-stroke engine.
空冷2サイクルエンジンは、第1図に示すように、シリ
ンダA及びシリンダヘッドBに、多数の冷却フィンC,
Dを立設し、シリンダA内での熱焼熱を冷却フィンC,
Dに伝え、風によって冷却している。As shown in FIG. 1, an air-cooled two-stroke engine has a cylinder A and a cylinder head B with a large number of cooling fins C,
D is installed vertically, and cooling fins C,
It is then sent to D and cooled down by the wind.
そして、シリンダAから突出した排気孔Eの周りにも冷
却フィンFが設けである。Cooling fins F are also provided around the exhaust hole E protruding from the cylinder A.
しかし、排気孔Eは、排気熱のため特に熱くなり、冷却
フィンFでは、冷却が不足して、シリンダAと排気孔E
では、温度差が大きくなる。However, the exhaust hole E becomes particularly hot due to the exhaust heat, and the cooling fins F are insufficiently cooled, causing the cylinder A and the exhaust hole E to become hot.
Then, the temperature difference becomes large.
特に鋳鉄シリンダでは、熱伝導が低いので、この傾向が
大きい。This tendency is particularly strong in cast iron cylinders due to their low heat conductivity.
このため、ブローパイが発生したり、焼付くような事故
が起こる。As a result, accidents such as blow pie and seizing occur.
この考案は、かかる点に鑑み改善したもので、以下第2
図及び第3図に示す本考案の実施例について説明する。This idea has been improved in view of this point, and is described in the second section below.
An embodiment of the present invention shown in FIGS. 3 and 3 will be described.
シリンダ1及びシリンダヘッド2には、多数の冷却フィ
ン3,4を立設する。A large number of cooling fins 3 and 4 are provided upright on the cylinder 1 and the cylinder head 2.
そしてシリンダ1から突出した排気孔5の周りにも冷却
フィン6を立設し、該冷却フィン6をシリンダ1の上端
面と同一面1で伸ばす。Cooling fins 6 are also erected around the exhaust hole 5 protruding from the cylinder 1, and the cooling fins 6 extend in the same plane 1 as the upper end surface of the cylinder 1.
シリンダ1の上端には銅板等の伝熱体のガスケツ)7を
置いてシリンダヘッド2を重ねてボルト等によって締着
する。A gasket 7 made of a heat transfer material such as a copper plate is placed on the upper end of the cylinder 1, and the cylinder heads 2 are stacked and fastened with bolts or the like.
シリンダヘッド2には第2図及び第4図で示すように排
気孔5の上方の部分に上記冷却フィン6に対応した張出
部2aが形成されており、ガスケツ)?4γaのように
張出している。As shown in FIGS. 2 and 4, the cylinder head 2 has an overhang 2a formed above the exhaust hole 5, which corresponds to the cooling fin 6. It overhangs like 4γa.
このように排気孔5に設けた冷却フィン6は伝熱体のガ
スケットIを介してシリンダヘッド2に当接される。The cooling fins 6 provided in the exhaust hole 5 are brought into contact with the cylinder head 2 via the gasket I, which is a heat transfer body.
なお、フィン6をガスケット7aに当接した場合、第4
図の斜線で示すように、フィン6の厚さ分だけしかガス
ケットに当らず、熱伝導率が劣るので、第6図に示すよ
うに、ガスケットの張出部7aに当る部分及びその近傍
のフィン6を連続平担面にすると熱伝導率を良くするこ
とができる。Note that when the fin 6 is brought into contact with the gasket 7a, the fourth
As shown by diagonal lines in the figure, only the thickness of the fin 6 contacts the gasket, resulting in poor thermal conductivity, so as shown in FIG. If 6 is a continuous flat surface, the thermal conductivity can be improved.
シリンダ1は鋳鉄又は軽合金で鋳造するが、シリンダヘ
ッド2は熱伝導率のよい軽合金鋳造である。The cylinder 1 is cast from cast iron or a light alloy, and the cylinder head 2 is cast from a light alloy with good thermal conductivity.
しかして、シリンダ1及びシリンダヘッド2内での燃焼
熱は、冷却フィン3及び4で冷却する。Thus, the combustion heat within the cylinder 1 and cylinder head 2 is cooled by the cooling fins 3 and 4.
燃焼ガスはピストンを押下げた後、細い排気孔5を通っ
て排気管に放出されるが、排気孔5付近に熱が集中し、
特に排気孔5付近が熱くなる。After the combustion gas pushes down the piston, it passes through the narrow exhaust hole 5 and is released into the exhaust pipe, but heat is concentrated near the exhaust hole 5.
In particular, the area around the exhaust hole 5 becomes hot.
しかシ、冷却フィン6は、伝熱体のガスケットIを介し
て、軽合金のシリンダヘッド2に当接させであるので、
排気孔5付近の熱が冷却フィン6を通して、冷却性のよ
いシリンダヘッド2に伝わり、冷却が促進できる。However, since the cooling fins 6 are brought into contact with the light alloy cylinder head 2 via the heat transfer gasket I,
Heat near the exhaust hole 5 is transmitted to the cylinder head 2, which has good cooling properties, through the cooling fins 6, and cooling can be promoted.
このため、排気孔5付近の冷却が促進されて、ブローパ
イの発生や焼付きを押えることができる。Therefore, cooling near the exhaust hole 5 is promoted, and the occurrence of blow pie and seizure can be suppressed.
以上説明したように、この考案は、鋳鉄または軽合金製
シリンダの一端に伝熱体からなるガスケットを介して軽
分金製のシリンダヘッドを連結する空冷2サイクルエン
ジンにおいて、上記シリンダの排気孔に立設した冷却フ
ィンをシリンダの端面と同一面に達するように形成し、
その冷却フィンの端面を、シリンダヘッドに上記冷却フ
ィン部に対応して設けられた張り出し部に上記ガスケッ
トを介して当接せしめたので、排気孔付近に集中した熱
を冷却フィンを介し、伝熱体のガスケットを介して、冷
却性のよいシリンダヘッドに逃すことができ、排気孔付
近の集中熱の冷却が促進できる。As explained above, this invention is applicable to an air-cooled two-stroke engine in which a cylinder head made of light metal is connected to one end of a cylinder made of cast iron or light alloy through a gasket made of a heat transfer material. The upright cooling fins are formed so as to reach the same surface as the end surface of the cylinder,
The end face of the cooling fin is brought into contact with the overhang provided on the cylinder head corresponding to the cooling fin part through the gasket, so that the heat concentrated near the exhaust hole is transferred through the cooling fin. Through the body gasket, the heat can be released to the cylinder head, which has good cooling properties, and the concentrated heat near the exhaust hole can be cooled down.
従って、ブローバイの発生や焼付き事故の低減が計れる
。Therefore, the occurrence of blow-by and seizure accidents can be reduced.
又、排気孔に設けた冷却フィンは、長くなるが、伝熱体
のガスケットを介してシリンダヘッドで押えているので
、振動も押えることができる。Furthermore, although the cooling fins provided in the exhaust holes are long, they are held down by the cylinder head via the heat transfer gasket, so vibrations can also be suppressed.
第1図は従来例を示す側面図、第2図及び第3図は本考
案の一実施例を示し、第2図は縦断面図、第3図は第2
図X−X矢視横断面図、第4図は第2図X−X矢視横断
面図、第5図は第2図に相当する他の実施例で、第6図
は第5図のZ−Z矢視横断面図である。
1・・・・・・シリンダ、2・・・・・・シリンダヘッ
ト、5・・・・・・排気孔、6・・・・・・冷却フィン
、T・・・・・・伝熱体のガスケット。Fig. 1 is a side view showing a conventional example, Figs. 2 and 3 show an embodiment of the present invention, Fig. 2 is a longitudinal sectional view, and Fig. 3 is a second
Figure 4 is a cross-sectional view taken along the line X-X of Figure 2, Figure 5 is another embodiment corresponding to Figure 2, and Figure 6 is a cross-sectional view taken along the line X-X of Figure 2. It is a ZZ arrow cross-sectional view. 1...Cylinder, 2...Cylinder head, 5...Exhaust hole, 6...Cooling fin, T...Heat transfer body gasket.
Claims (1)
スケットを介して軽合金製のシリンダヘッドを連結する
空冷2サイクルエンジンにおいて、上記シリンダの排気
孔に立設した冷却フィンをシリンダの端面と同一面に達
するように形成し、その冷却フィンの端面を、シリンダ
ヘッドの上記冷却フィン部に対応して設けられた張り出
し部に上記ガスケットを介して当接せしめたことを特徴
とする。 空冷2サイクルエンジンのシリンダ冷却促進装置。[Scope of Claim for Utility Model Registration] In an air-cooled two-stroke engine in which a cylinder head made of a light alloy is connected to one end of a cylinder made of cast iron or a light alloy through a gasket made of a heat transfer material, The provided cooling fins are formed so as to reach the same surface as the end surface of the cylinder, and the end surface of the cooling fin is brought into contact with an overhang portion provided corresponding to the cooling fin portion of the cylinder head via the gasket. It is characterized by: Cylinder cooling acceleration device for air-cooled 2-stroke engines.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2653679U JPS5928102Y2 (en) | 1979-03-02 | 1979-03-02 | Cylinder cooling accelerator for air-cooled two-stroke engines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2653679U JPS5928102Y2 (en) | 1979-03-02 | 1979-03-02 | Cylinder cooling accelerator for air-cooled two-stroke engines |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS55125932U JPS55125932U (en) | 1980-09-06 |
JPS5928102Y2 true JPS5928102Y2 (en) | 1984-08-14 |
Family
ID=28868976
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2653679U Expired JPS5928102Y2 (en) | 1979-03-02 | 1979-03-02 | Cylinder cooling accelerator for air-cooled two-stroke engines |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5928102Y2 (en) |
-
1979
- 1979-03-02 JP JP2653679U patent/JPS5928102Y2/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
JPS55125932U (en) | 1980-09-06 |
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