JPS6138325B2 - - Google Patents
Info
- Publication number
- JPS6138325B2 JPS6138325B2 JP10112979A JP10112979A JPS6138325B2 JP S6138325 B2 JPS6138325 B2 JP S6138325B2 JP 10112979 A JP10112979 A JP 10112979A JP 10112979 A JP10112979 A JP 10112979A JP S6138325 B2 JPS6138325 B2 JP S6138325B2
- Authority
- JP
- Japan
- Prior art keywords
- cooling water
- cylinder
- port
- temperature
- water jacket
- 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
- 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
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
本発明は水冷式２サイクルエンジンにおいて、
掃気ポートを有効に冷却し、充填効率を向上させ
出力アツプを図るようにした、水冷式２サイクル
エンジンにおける冷却装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention provides a water-cooled two-stroke engine,
The present invention relates to a cooling device for a water-cooled two-stroke engine that effectively cools a scavenging port to improve charging efficiency and increase output.
従来水冷式２サイクルエンジンでは、吸気ポー
トおよび掃気ポートを冷却する水温は80℃以下に
保ち、吸気の充填効率を向上させて出力低下を僅
少に抑えることが望ましいが、掃気ポート、特に
その出口近傍は排気ポート等の高温加熱部からの
熱の影響をうけるので、掃気ポートの冷却水温を
前述のように80℃以下に保つためには、冷却回路
中のラジエタの放熱面積を大きく設定する必要が
あり、冷却系の重量増を招くばかりでなくコスト
高になり、さらに冷却水の占める占有容積が大き
くなつてそのレイアウトがしにくゝなる等の不具
合がある。 In conventional water-cooled two-stroke engines, it is desirable to keep the temperature of the water used to cool the intake and scavenging ports below 80°C to improve the intake air filling efficiency and minimize output loss. is affected by heat from high-temperature heating parts such as the exhaust port, so in order to keep the cooling water temperature of the scavenging port below 80℃ as mentioned above, it is necessary to set the heat dissipation area of the radiator in the cooling circuit large. This not only increases the weight of the cooling system, but also increases the cost.Furthermore, the volume occupied by the cooling water increases, making the layout difficult.
そこで本発明は、エンジンのシリンダ部に形成
される冷却水ジヤケツトに改良を加えて、特にラ
ジエタの放熱面積を大きくせずともエンジンの掃
気ポートの周囲を有効に冷却できるようにした、
水冷式２サイクルエンジンにおける冷却装置を提
供することを目的とするものである。 Therefore, the present invention improves the cooling water jacket formed in the cylinder part of the engine so that the area around the scavenging port of the engine can be effectively cooled without particularly increasing the heat dissipation area of the radiator.
The object of the present invention is to provide a cooling device for a water-cooled two-stroke engine.
以下、図面により本発明の実施例について説明
すると、エンジンのシリンダ部Cyは、シリンダ
ブロツク１と、その上面にガスケツト３を介して
重合装着されるシリンダヘツド２とより構成され
ている。 DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. A cylinder portion Cy of an engine is composed of a cylinder block 1 and a cylinder head 2 superimposed on the upper surface of the cylinder block 1 via a gasket 3.
シリンダブロツク１には、その一側にシリンダ
孔４に連通する吸気ポート５が形成され、またそ
の他側に同じくシリンダ孔４に連通する排気ポー
ト６が形成される。吸気ポート５はシリンダ孔４
の下部に開口して、シリンダ孔４内に摺合される
ピストン７の上昇時にシリンダブロツク１下方の
クランク室８内に連通し、一方排気ポート６は、
シリンダ孔４の上部に開口して前記ピストン７の
下降時に、シリンダ孔４上部の燃焼室９に連通さ
れる。 The cylinder block 1 is formed with an intake port 5 communicating with the cylinder hole 4 on one side, and an exhaust port 6 communicating with the cylinder hole 4 on the other side. Intake port 5 is cylinder hole 4
The exhaust port 6 opens at the bottom of the cylinder block 1 and communicates with the crank chamber 8 below the cylinder block 1 when the piston 7 slides into the cylinder hole 4 rises.
It opens at the top of the cylinder hole 4 and communicates with the combustion chamber 9 above the cylinder hole 4 when the piston 7 descends.
吸気ポート５は、そこに設けられるリード弁１
０を介して図示しない気化器に連通され、また排
気ポート６は図示しない排気管に連通される。 The intake port 5 has a reed valve 1 provided there.
0 to a carburetor (not shown), and the exhaust port 6 is connected to an exhaust pipe (not shown).
シリンダブロツク１の、前記吸、排気ポート
５，６と略直交する両側壁部には掃気ポート１
１，１１′が対称的に形成され、これら掃気ポー
ト１１，１１′の上部開口端は燃焼室９に、また
その下部開口端はクランク室８にそれぞれ連通さ
れる。 Scavenging ports 1 are provided on both side walls of the cylinder block 1 that are substantially perpendicular to the intake and exhaust ports 5 and 6.
1 and 11' are formed symmetrically, and the upper open ends of these scavenging ports 11 and 11' communicate with the combustion chamber 9, and the lower open ends thereof communicate with the crank chamber 8, respectively.
シリンダ孔４の上方において、シリンダヘツド
２には、点火栓１２が螺着され、その電極１３は
燃焼室９内に臨んでいる。 An ignition plug 12 is screwed onto the cylinder head 2 above the cylinder hole 4, and its electrode 13 faces into the combustion chamber 9.
次に水冷式エンジンの冷却系について説明する
と、前記シリンダブロツク１とシリンダヘツド２
とよりなるシリンダ部Cyには、各独立した２系
統の高熱および低熱冷却水ジヤケツト１４，１５
が形成されており、すなわち前記シリンダブロツ
ク１にはその排気ポート６側半部壁に高熱冷却水
ジヤケツト１４が、またその吸気ポート５側半部
壁に低熱冷却水ジヤケツト１５が仕切壁１６を挾
んで各独立して形成され、前記高熱冷却水ジヤケ
ツト１４は、排気ポート６を取囲むとゝもにガス
ケツト３を貫通してシリンダヘツド２へとのび、
そこに形成される燃焼室９の上部を覆つており、
一方低熱冷却水ジヤケツト１５は左、右の掃気ポ
ート１１，１１′をそれぞれ囲繞するように環状
に形成され、それらは吸気ポート５に向つてのび
ており、その吸気ポート５の上部で合流してい
る。 Next, the cooling system of a water-cooled engine will be explained.
The cylinder part Cy consists of two independent systems of high-heat and low-heat cooling water jackets 14 and 15.
That is, in the cylinder block 1, a high-temperature cooling water jacket 14 is formed on the half wall on the side of the exhaust port 6, and a low-temperature cooling water jacket 15 is formed on the half wall on the side of the intake port 5, sandwiching the partition wall 16. The high-temperature cooling water jackets 14 surround the exhaust port 6 and extend through the gasket 3 to the cylinder head 2.
It covers the upper part of the combustion chamber 9 formed there,
On the other hand, the low-temperature cooling water jacket 15 is formed in an annular shape so as to surround the left and right scavenging ports 11 and 11', respectively, and they extend toward the intake port 5 and meet at the upper part of the intake port 5. .
前記高熱冷却水ジヤケツト１４は、排気ポート
６の下方において、その流入口１７が開口され、
またシリンダヘツド２の上部においてその流出口
１８が開口されている。一方前記低熱冷却水ジヤ
ケツト１５は、一方の掃気ポート１１の一側にお
いてその流入口１９が開口され、またシリンダブ
ロツク１の上部においてその流出口２０が開口さ
れている。前記高熱冷却水ジヤケツト１４の流入
口１７と流出口１８間には高熱冷却水回路C1
が、また低熱冷却水ジヤケツト１５の流入口１９
と流出口２０間には低熱冷却水回路C2がそれぞ
れ接続されている。 The high-temperature cooling water jacket 14 has an inlet 17 opened below the exhaust port 6, and
Further, an outlet 18 is opened at the upper part of the cylinder head 2. On the other hand, the low-temperature cooling water jacket 15 has an inlet 19 opened at one side of one of the scavenging ports 11, and an outlet 20 opened at the upper part of the cylinder block 1. A high temperature cooling water circuit C1 is provided between the inlet 17 and the outlet 18 of the high temperature cooling water jacket 14.
However, the inlet 19 of the low-temperature cooling water jacket 15
A low-temperature cooling water circuit C 2 is connected between the outlet port 20 and the outlet port 20 .
前記高熱冷却水回路C1には第１水ポンプP1と
第１ラジエタR1とが直列に接続されており、該
回路C1の流入口１７には第１水ポンプP1の吐出
側が連通され、またその流出口１８には第１ラジ
エタR1の入口が連通され、第１水ポンプP1の吸
込側に第１ラジエタR1の出口が連通される。ま
た前記低熱冷却水回路C2には第２水ポンプP2と
第２ラジエタR2とが直列に接続されており、該
回路C2の流入口１９には第２水ポンプP2の吐出
側が連通され、またその流出口２０には第２ラジ
エタR2の入口が連通され、第２水ポンプP2の吸
込側に第２ラジエタR2の出口が連通される。 A first water pump P 1 and a first radiator R 1 are connected in series to the high-temperature cooling water circuit C 1 , and the discharge side of the first water pump P 1 communicates with the inlet 17 of the circuit C 1 . The inlet of the first radiator R1 is communicated with the outlet 18, and the outlet of the first radiator R1 is communicated with the suction side of the first water pump P1 . Further, a second water pump P 2 and a second radiator R 2 are connected in series to the low-temperature cooling water circuit C 2 , and the discharge side of the second water pump P 2 is connected to the inlet 19 of the circuit C 2 . The inlet of the second radiator R2 is communicated with the outlet 20, and the outlet of the second radiator R2 is communicated with the suction side of the second water pump P2 .
次に本発明の実施例の作用について説明する
と、いまエンジンが運転されるとこれに連動して
第１、第２水ポンプP1，P2がともに運転され、第
１ポンプP1からの冷却水は高熱冷却水回路C1を
循環し、高熱冷却水ジヤケツト１４に流入した冷
却水は排気ポート６の周囲およびシリンダヘツド
２を冷却した後、第１ラジエタR1に流入し、こ
こで放熱された第１水ポンプP1に戻る。而して高
熱冷却水ジヤケツト１４に流入する水の温度は約
100℃に保たれるように制御される。 Next, to explain the operation of the embodiment of the present invention, when the engine is operated, both the first and second water pumps P 1 and P 2 are operated in conjunction with this, and the cooling from the first pump P 1 is The water circulates through the high-temperature cooling water circuit C1 , and the cooling water that flows into the high-temperature cooling water jacket 14 cools the area around the exhaust port 6 and the cylinder head 2, and then flows into the first radiator R1 , where the heat is radiated. Return to the first water pump P1 . Therefore, the temperature of the water flowing into the high-temperature cooling water jacket 14 is approximately
It is controlled to be kept at 100℃.
また第２水ポンプP2からの冷却水は低熱冷却水
回路C2を循環し、低熱冷却水ジヤケツト１５に
流入した冷却水は左、右の掃気ポート１１，１
１′の周囲を流れて、該ポート１１，１１′を十分
に冷却した後、合流して吸気ポート５の上方へ流
れ、該ポート５を冷却して第２ラジエタR2に流
入し、こゝで放熱して第２水ポンプP2へ戻る。而
して低熱冷却水ジヤケツト１５に流入する水の温
度は80℃以下に保たれるように制御される。 In addition, the cooling water from the second water pump P 2 circulates through the low-temperature cooling water circuit C 2 , and the cooling water flowing into the low-temperature cooling water jacket 15 flows through the left and right scavenging ports 11 and 1.
1' and sufficiently cools the ports 11 and 11', then merges and flows above the intake port 5, cools the port 5, and flows into the second radiator R2 . The heat is radiated and returned to the second water pump P2 . Thus, the temperature of the water flowing into the low-temperature cooling water jacket 15 is controlled to be kept below 80°C.
以上のように本発明によれば、シリンダ部に設
けた冷却水ジヤケツトを以て、そのシリンダ部に
形成した掃気ポートの周囲を囲繞し、その掃気ポ
ートの周囲を集中的に冷却するようにしたので、
特にラジエタの放熱面積を大きくしなくても掃気
ポートの冷却水温を所定温度（80℃）以下に保つ
ことができ、その結果吸気の充填効率を著しく向
上させることができ、エンジンの出力性能を高め
ることができる。 As described above, according to the present invention, the scavenging port formed in the cylinder is surrounded by the cooling water jacket provided in the cylinder, and the area around the scavenging port is intensively cooled.
In particular, the cooling water temperature at the scavenging port can be kept below the specified temperature (80℃) without increasing the heat dissipation area of the radiator, and as a result, the intake air filling efficiency can be significantly improved, increasing the engine's output performance. be able to.
第１図は本発明装置を備えた２サイクルエンジ
ンのシリンダ部の縦断面図、第２図は第１図−
線縦断面図、第３図は第１図−線横断平面
図、第４図は本発明装置の冷却回路図である。
１１，１１′……掃気ポート、１４……高熱冷
却水ジヤケツト、１５……低熱冷却水ジヤケツ
ト、Cy……シリンダ部。
Fig. 1 is a longitudinal sectional view of the cylinder section of a two-stroke engine equipped with the device of the present invention, and Fig.
FIG. 3 is a cross-sectional plan view taken from FIG. 1, and FIG. 4 is a cooling circuit diagram of the apparatus of the present invention. 11, 11'...Scavenging port, 14...High temperature cooling water jacket, 15...Low heat cooling water jacket, Cy...Cylinder section.
Claims (1)
冷却水ジヤケツトに冷却水を循環させ、前記シリ
ンダ部を冷却するようにした水冷式２サイクルエ
ンジンにおいて、前記冷却水ジヤケツトを以て前
記シリンダ部に形成した掃気ポートの周囲を囲繞
させてなる、水冷式２サイクルエンジンにおける
冷却装置。1. In a water-cooled two-stroke engine, which is provided with a cooling water jacket in a cylinder part, and in which cooling water is circulated through the cooling water jacket to cool the cylinder part, a scavenging port formed in the cylinder part using the cooling water jacket. A cooling device for a water-cooled two-stroke engine, which surrounds the periphery of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10112979A JPS5627022A (en) | 1979-08-08 | 1979-08-08 | Cooling device in water-cooled two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10112979A JPS5627022A (en) | 1979-08-08 | 1979-08-08 | Cooling device in water-cooled two-cycle engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5627022A JPS5627022A (en) | 1981-03-16 |
| JPS6138325B2 true JPS6138325B2 (en) | 1986-08-28 |
Family
ID=14292459
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10112979A Granted JPS5627022A (en) | 1979-08-08 | 1979-08-08 | Cooling device in water-cooled two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5627022A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60132049A (en) * | 1983-12-19 | 1985-07-13 | Honda Motor Co Ltd | Cooling water mechanism for 2 cycle engine |
| AUPM364894A0 (en) * | 1994-02-01 | 1994-02-24 | Orbital Engine Company (Australia) Proprietary Limited | Improvements relating to two stroke cycl engines |
-
1979
- 1979-08-08 JP JP10112979A patent/JPS5627022A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5627022A (en) | 1981-03-16 |
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