JPH03260373A - Two-cycle engine - Google Patents
Two-cycle engineInfo
- Publication number
- JPH03260373A JPH03260373A JP5655990A JP5655990A JPH03260373A JP H03260373 A JPH03260373 A JP H03260373A JP 5655990 A JP5655990 A JP 5655990A JP 5655990 A JP5655990 A JP 5655990A JP H03260373 A JPH03260373 A JP H03260373A
- Authority
- JP
- Japan
- Prior art keywords
- piston
- fuel
- crank chamber
- injection valve
- fuel injection
- 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
- 239000000446 fuel Substances 0.000 claims abstract description 45
- 238000002347 injection Methods 0.000 claims abstract description 28
- 239000007924 injection Substances 0.000 claims abstract description 28
- 238000001816 cooling Methods 0.000 abstract description 5
- 230000008016 vaporization Effects 0.000 abstract description 5
- 238000009834 vaporization Methods 0.000 abstract description 5
- 235000014676 Phragmites communis Nutrition 0.000 abstract description 2
- 230000001737 promoting effect Effects 0.000 abstract 1
- 230000002000 scavenging effect Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
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
- Fuel-Injection Apparatus (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、燃料でピストンを効果的に冷却できるよう
にしたニ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 two-cycle engine whose pistons can be effectively cooled with fuel.
ニサイクルエンジンでは、吸気通路に設けたスロットル
バルブで吸気量をコントロールし、燃料は吸気量に応じ
て燃料噴射弁で噴射するようにしたものがある。この場
合、燃料噴射弁は、吸気通路のスロットルバルブの後側
か、掃気通路にシリンダー内に向けて噴射するように取
付けられている。例えば、特開平１−１７０７５８号公
報、実開昭６３−１３０６７２号公報参照。In some two-cycle engines, the amount of intake air is controlled by a throttle valve installed in the intake passage, and fuel is injected by a fuel injection valve according to the amount of intake air. In this case, the fuel injection valve is installed behind the throttle valve in the intake passage or in the scavenging passage so as to inject into the cylinder. For example, see Japanese Unexamined Patent Publication No. 1-170758 and Japanese Utility Model Application No. 63-130672.
吸気通路に燃料噴射弁を取付けたものは、燃料を含んだ
吸気ガスがクランク室で一次圧縮されるとき、一部ピス
トンの裏面に当ってピストンが冷却できる。又、掃気通
路に燃料噴射弁を設けたものは、クランク室で一次圧縮
される吸気のみで、ピストンの裏面が冷却できる。しか
し、エンジンの高出力化を図ると、ピストンヘッドの熱
負荷が大きくなり、ピストン裏面の上記冷却だけでは、
冷却が不足し、ピストンヘッドが溶解破損するようにな
る。このため、ピストンの肉厚さを厚くしたりして対策
するとピストン重量増による振動増加など新たな問題が
発生する。With a fuel injection valve installed in the intake passage, when the intake gas containing fuel is primarily compressed in the crank chamber, a portion of the intake gas hits the back surface of the piston, cooling the piston. Furthermore, in the case where a fuel injection valve is provided in the scavenging passage, the back surface of the piston can be cooled only by the intake air that is primarily compressed in the crank chamber. However, as the engine output increases, the heat load on the piston head increases, and cooling the back surface of the piston alone is insufficient.
Cooling will be insufficient and the piston head will melt and break. Therefore, if countermeasures are taken by increasing the wall thickness of the piston, new problems such as increased vibration due to the increased weight of the piston will occur.
この発明は、かかる点に鑑み、ピストンの裏面を燃料で
冷却し、前記問題を解消できるニサイクルエンジンを得
ることを目的とする。In view of this problem, it is an object of the present invention to provide a two-cycle engine that can solve the above problem by cooling the back surface of the piston with fuel.
上記目的を達成するために、この発明のニサイクルエン
ジンは、ニサイクルエンジンのクランク室に燃料噴射弁
を取付け、該燃料噴射弁の噴射ノズルをピストン裏面に
向けて燃料を噴射するように向け、ピストンの裏面に燃
料を噴射するようにしたことにある。In order to achieve the above object, the two-cycle engine of the present invention has a fuel injection valve installed in the crank chamber of the two-cycle engine, and the injection nozzle of the fuel injection valve is oriented to inject fuel toward the back surface of the piston. The reason is that the fuel is injected onto the back side of the piston.
クランク室に設けた燃料噴射弁から、ピストン裏面に向
けて燃料を噴射し、燃料でピストンを冷却できる。高出
力型で２５０℃程度まで温度上昇するピストンを燃料の
気化熱を利用して効果的に冷却できる。又、燃料は気化
がよくてきて吸気ガスの良質化ができる。又、ピストン
は肉厚を薄くできて、振動の発生を低減できる。A fuel injection valve installed in the crank chamber injects fuel toward the back of the piston, allowing the piston to be cooled with fuel. The high-output type piston, whose temperature rises to around 250 degrees Celsius, can be effectively cooled using the heat of vaporization of the fuel. In addition, the fuel is better vaporized and the quality of the intake gas can be improved. Additionally, the piston can be made thinner, which reduces vibrations.
以下、本発明の実施例を図面によって説明する。 Embodiments of the present invention will be described below with reference to the drawings.
第１図及び第２図は本発明の一実施例を示すものである
。1 and 2 show one embodiment of the present invention.
ニサイクルエンジンのクランク室１には、吸気通路２が
連結され、スロットルバルブ３の開閉で調量した吸気が
、リード弁４を介し、ピストン５が上昇行程で、クラン
ク室１が負圧になるときに、クランク室１に吸気が吸入
される。途中吸気には、オイルノズル６から、微量の潤
滑オイルが混入される。クランク室１の下部には、燃料
噴射弁７を取付ける。燃料噴射弁７は、噴射ノズル８を
左右のクランクホイール９の間を通して、ピストン５の
裏面に向け、ピストン５の裏面に燃料を噴射する。燃料
は、燃料噴射弁７から、吸気量に応じてピストン５の上
死点前から下死点後の間で噴射される。燃料はピストン
５に当って、ピストン５を冷却し、気化が促進されて、
クランク室１内の吸気に混入して吸気ガスになる。吸気
ガスは、ピストン５の下死点前後で掃気通路１０を通っ
てシリンダー１１内に入り、ピストン５で圧縮されて点
火栓１２で点火され、燃焼してピストン５を押下げ、排
気孔１３に排出される。燃料噴射弁７は、クランク室１
の下部の排気孔１３側に設けであるが、掃気通路１０側
に設けてもよい。An intake passage 2 is connected to the crank chamber 1 of the two-cycle engine, and intake air regulated by opening and closing a throttle valve 3 is passed through a reed valve 4, and when the piston 5 is on its upward stroke, the crank chamber 1 becomes under negative pressure. At times, intake air is drawn into the crank chamber 1. A small amount of lubricating oil is mixed into the intake air from the oil nozzle 6. A fuel injection valve 7 is attached to the lower part of the crank chamber 1. The fuel injection valve 7 directs an injection nozzle 8 toward the back surface of the piston 5 by passing the injection nozzle 8 between the left and right crank wheels 9, and injects fuel onto the back surface of the piston 5. Fuel is injected from the fuel injection valve 7 between before the top dead center and after the bottom dead center of the piston 5 depending on the amount of intake air. The fuel hits the piston 5, cools the piston 5, and promotes vaporization.
It mixes with the intake air in the crank chamber 1 and becomes intake gas. Intake gas enters the cylinder 11 through the scavenging passage 10 before and after the bottom dead center of the piston 5, is compressed by the piston 5, is ignited by the ignition plug 12, burns, pushes down the piston 5, and enters the exhaust hole 13. It is discharged. The fuel injection valve 7 is connected to the crank chamber 1
Although it is provided on the exhaust hole 13 side in the lower part of , it may be provided on the scavenging passage 10 side.
第３図及び第４図は本発明の他の実施例を示すものであ
る。この場合には、クランク室１の上部に燃料噴射弁７
を取付け、噴射ノズル８をピストン５のｍｉに向けてあ
って、ピストン５の裏面に燃料を吹付けるようにしであ
る。その他は、第１図及び第２図に示したものと同じで
ある。燃料噴射弁７は、ピストン５の中心から、左右に
オフセットして取付け、噴射ノズル８の向きをピストン
５の裏面に向けて傾けてもよい。FIGS. 3 and 4 show other embodiments of the present invention. In this case, the fuel injection valve 7 is placed in the upper part of the crank chamber 1.
is attached, and the injection nozzle 8 is directed toward mi of the piston 5 so as to spray fuel onto the back surface of the piston 5. The other parts are the same as those shown in FIGS. 1 and 2. The fuel injection valve 7 may be mounted offset to the left and right from the center of the piston 5, and the injection nozzle 8 may be tilted toward the back surface of the piston 5.
以」二説明したように、この発明は、上述のように構成
したので、クランク室に取付けた燃料噴射弁から、ピス
トンの裏面に向けて燃料を噴射し、燃料でピストンを冷
却でき、燃料の気化熱で効率よくピストンを冷却できる
。こうして、ピストンの温度上昇を防ぎ、溶融破損を防
止できる。このため、ピストンは肉厚さを薄くできて軽
量にでき、振動の発生も少いものにできる。又、燃料は
、ピストンの熱を受けて、気化が促進し、吸気ガスを燃
焼し易い良質のものにできる。As explained above, since the present invention is configured as described above, fuel can be injected from the fuel injection valve attached to the crank chamber toward the back surface of the piston, and the piston can be cooled with the fuel. The heat of vaporization can efficiently cool the piston. In this way, the temperature of the piston can be prevented from rising and melting damage can be prevented. Therefore, the piston can be made thinner and lighter, and generate less vibration. In addition, the fuel receives heat from the piston, promotes vaporization, and makes the intake gas a high-quality fuel that is easily combustible.
第１図及び第２図は本発明の一実施例を示し、第１図は
縦断側面図、
第２図は同背面図、
第３図及び第４図は本考案の他の実施例を示し、第３図
は縦断側面図、
第４図は同背面図、
である。
１・・・クランク室、５・・・ピストン、７・・・燃料
噴射弁、８・・・噴射ノズル。1 and 2 show one embodiment of the present invention, FIG. 1 is a vertical side view, FIG. 2 is a rear view of the same, and FIGS. 3 and 4 are other embodiments of the present invention. , Fig. 3 is a longitudinal side view, and Fig. 4 is a rear view of the same. 1... Crank chamber, 5... Piston, 7... Fuel injection valve, 8... Injection nozzle.
Claims (1)
け、該燃料噴射弁の噴射ノズルをピストン裏面に向けて
燃料を噴射するように向け、ピストンの裏面に燃料を噴
射するようにしたことを特徴する二サイクルエンジン。A fuel injection valve is attached to the crank chamber of a two-stroke engine, and an injection nozzle of the fuel injection valve is oriented to inject fuel toward the back surface of the piston, so that the fuel is injected onto the back surface of the piston. cycle engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5655990A JPH03260373A (en) | 1990-03-09 | 1990-03-09 | Two-cycle engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5655990A JPH03260373A (en) | 1990-03-09 | 1990-03-09 | Two-cycle engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03260373A true JPH03260373A (en) | 1991-11-20 |
Family
ID=13030476
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5655990A Pending JPH03260373A (en) | 1990-03-09 | 1990-03-09 | Two-cycle engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03260373A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0979116A (en) * | 1995-09-08 | 1997-03-25 | Kawasaki Heavy Ind Ltd | Two-cycle engine |
| WO2021177010A1 (en) * | 2020-03-02 | 2021-09-10 | 株式会社やまびこ | Two-cycle internal combustion engine and engine work machine |
-
1990
- 1990-03-09 JP JP5655990A patent/JPH03260373A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0979116A (en) * | 1995-09-08 | 1997-03-25 | Kawasaki Heavy Ind Ltd | Two-cycle engine |
| WO2021177010A1 (en) * | 2020-03-02 | 2021-09-10 | 株式会社やまびこ | Two-cycle internal combustion engine and engine work machine |
| US11795871B2 (en) | 2020-03-02 | 2023-10-24 | Yamabiko Corporation | Two-stroke internal combustion engine and engine working machine |
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