JPS6218663Y2 - - Google Patents
Info
- Publication number
- JPS6218663Y2 JPS6218663Y2 JP6301482U JP6301482U JPS6218663Y2 JP S6218663 Y2 JPS6218663 Y2 JP S6218663Y2 JP 6301482 U JP6301482 U JP 6301482U JP 6301482 U JP6301482 U JP 6301482U JP S6218663 Y2 JPS6218663 Y2 JP S6218663Y2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- movable plate
- spring
- turbulence
- fuel mixture
- 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
- 238000002485 combustion reaction Methods 0.000 description 14
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 239000000446 fuel Substances 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 230000007423 decrease Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
本考案は、車両用内燃機関のピストンに関し、
特に圧縮行程終期にシリンダ内の混合気に乱れを
生成するものに関する。
内燃機関において燃焼室内の混合気の燃焼を改
良して熱効率を上げるためには、特に圧縮行程終
了頃、即ち着火時及び着火後にスワール、スキツ
シユ等の乱流が要求される。
The present invention relates to a piston for a vehicle internal combustion engine.
In particular, it relates to those that generate turbulence in the air-fuel mixture in the cylinder at the end of the compression stroke. In an internal combustion engine, in order to improve the combustion of the air-fuel mixture in the combustion chamber and increase the thermal efficiency, turbulent flow such as swirl and squish is required especially towards the end of the compression stroke, that is, at the time of ignition and after ignition.
そこで従来、かかる乱流を生成するものとし
て、ハイスワールポート、マスクドシート等によ
り吸入時にスワールを起こす方法があるが、これ
は吸入時に生成されるものであるため圧縮行程終
期にはそれ程残つておらず、効果が小さい。ま
た、燃焼室の内壁とピストンの間のスキツシユに
より乱れを生成する方法では、機関回転速度の低
い場合には効かず、且つプラグ周辺への乱れ効果
は余りない。
なお本考案に関しては、従来例えば特開昭50−
76427号公報の先行技術があるが、これはピスト
ンの頂部内側に補助燃焼室を有し、爆発行程でこ
の補助燃焼室から火炎を主燃焼室に噴出させるも
ので、本考案のように混合気の乱流を生成するも
のとは技術思想が異なる。また、本考案の可動板
に類似する先行技術として、例えば特開昭49−
63815号公報があるが、これはピストン自体を２
分割し、排気行程において上部ピストンを伸長し
て排気ガスを押出すものであり、本考案のように
ピストン本体と別個の可動板を有し、且つ慣性力
を利用して飛び出させるものとは構成、作用効果
が全く異なる。
本考案はこのような事情に鑑み、圧縮行程終期
にシリンダ内の混合気に確実に乱れを生成して燃
焼効率の向上を図るようにしたピストンを提供す
ることを目的とする。
Conventionally, methods for generating such turbulent flow include creating swirls during suction using high swirl ports, masked sheets, etc., but since this is generated during suction, it does not remain as much at the end of the compression stroke. However, the effect is small. Furthermore, the method of generating turbulence by squishing between the inner wall of the combustion chamber and the piston is not effective when the engine rotation speed is low, and the turbulence effect around the plug is not so great. Regarding this invention, conventionally, for example, Japanese Patent Application Laid-Open No. 1989-
There is a prior art in Publication No. 76427, which has an auxiliary combustion chamber inside the top of the piston, and injects flame from this auxiliary combustion chamber into the main combustion chamber during the explosion stroke. The technical philosophy is different from that which generates turbulent flow. In addition, as a prior art similar to the movable plate of the present invention, for example,
There is a publication No. 63815, which says that the piston itself is
The upper piston is divided into two parts and the upper piston is extended during the exhaust stroke to push out the exhaust gas.The piston of this invention has a movable plate separate from the piston body and uses inertia force to eject the exhaust gas. , the effects are completely different. In view of these circumstances, it is an object of the present invention to provide a piston that reliably creates turbulence in the air-fuel mixture in the cylinder at the end of the compression stroke to improve combustion efficiency.
この目的を達成するため本考案のピストンは、
ピストン往復運動において上死点直前、即ち圧
縮、排気行程の終期では急激に速度が低下して慣
性力を生じる点に着目し、この慣性力を利用して
ピストン頂部に設けた可動板を飛び出させ、後退
運動して混合気を乱し、火炎を急速伝播させるこ
とを特徴とする。
To achieve this purpose, the piston of the present invention is
We focused on the point in the piston's reciprocating motion just before top dead center, that is, at the end of the compression and exhaust strokes, where the speed suddenly decreases and inertia is generated, and this inertia is used to make the movable plate installed at the top of the piston pop out. , which is characterized by a backward movement that disturbs the air-fuel mixture and causes rapid flame propagation.
以下、図面を参照して本考案の一実施例につい
て具体的に説明すると、第１図において、符号１
はシリンダ、２はシリンダ１内に挿入されて上下
に往復運動するピストン、３は燃焼室であり、こ
の燃焼室３に連通する例えば吸気ポート４に吸気
弁が設けてある。
かかる構成において、ピストン２の頂部２ａに
は、円、楕円、ハート形等の形状をした耐熱性の
材料（例えばSUH等）から成る可動板６が装着
されるが、この可動板６の中心にロツド７が結合
され、このロツド７がピストン頂部２ａの略中心
の孔８を通つてピストン本体２ｂ内に挿入され
る。ここで、ピストン本体２ｂ内の頂部２ａ裏側
には孔８より径の大きい室９が形成されて、この
室９内でロツド７の可動板６と反対側にスプリン
グ受け１０が取付けてあり、且つピストン頂部２
ａとスプリング受け１０との間にスプリング１１
が付勢されるのであり、こうして可動板６は後退
してピストン頂部２ａに密着し又はピストン頂部
２ａから離れて飛び出すことが可能になる。そし
て、室９の開口部には盲栓１２が圧着されて、室
９とピストン本体２ｂとの間を遮断するようにし
てある。
なお可動板６、ロツド７及びスプリング受け１
０の合計質量、又スプリング１１のスプリング力
はピストン往復運動の際の慣性力で可動板６が飛
び出し得るように設定されている。また、孔８内
のロツド７との隙間は少ない方が良いが、熱又は
カーボン堆積物等によりステイツクを生じないよ
うな孔径を選択する必要がある。
可動板６は、ピストンの上昇行程、つまり圧
縮、排気の各行程でピストン頂部２ａから離れる
が、排気行程では排気弁が開くので、排気弁との
干渉がないように設置されている。
次いで、このように構成された本考案の作用を
第２図を用いて説明すると、圧縮行程の初期ない
し中期ではピストン２が高速で上昇して可動板６
はピストン頂部２ａに押付けられ、スプリング１
１の力も作用することから、可動板６はａのよう
にピストン頂部２ａに密着して一体的に移動す
る。そして上記行程の終期においては、ピストン
２の速度が急激に低下することから可動板６はこ
のとき慣性力によりｂのようにスプリング１１に
抗して飛び出すようになる。その後慣性力は減
じ、スプリング１１の力が作用することで可動板
６が押下げられてピストン頂部２ａに密着するよ
うになり、このとき可動板６とピストン頂部２ａ
との間に入つた混合気をｃのように噴出させる。
こうして圧縮行程の終期において可動板６が飛び
出し又は後退移動することで混合気に乱れを生じ
ることになり、このような乱れを生じた直後点火
プラグにより着火させられることで、その火炎は
乱流により急激に伝播して燃焼が行われる。
Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.
2 is a cylinder, 2 is a piston that is inserted into the cylinder 1 and reciprocates up and down, 3 is a combustion chamber, and, for example, an intake port 4 communicating with this combustion chamber 3 is provided with an intake valve. In this configuration, a movable plate 6 made of a heat-resistant material (for example, SUH, etc.) and having a circular, oval, or heart shape is attached to the top 2a of the piston 2. A rod 7 is connected, and the rod 7 is inserted into the piston body 2b through a hole 8 approximately in the center of the piston top 2a. Here, a chamber 9 having a larger diameter than the hole 8 is formed on the back side of the top portion 2a in the piston body 2b, and a spring receiver 10 is attached to the opposite side of the movable plate 6 of the rod 7 within this chamber 9. Piston top 2
A spring 11 is placed between a and the spring receiver 10.
The movable plate 6 is thus energized, and the movable plate 6 is thus able to move back and come into close contact with the piston top 2a or to fly away from the piston top 2a. A blind plug 12 is press-fitted to the opening of the chamber 9 to isolate the chamber 9 from the piston body 2b. In addition, the movable plate 6, rod 7 and spring receiver 1
The total mass of 0 and the spring force of the spring 11 are set so that the movable plate 6 can pop out due to inertia during the reciprocating movement of the piston. Further, although it is better to have a small gap between the hole 8 and the rod 7, it is necessary to select a hole diameter that will not cause sticking due to heat or carbon deposits. The movable plate 6 separates from the piston top 2a during the upward stroke of the piston, that is, the compression and exhaust strokes, but since the exhaust valve opens during the exhaust stroke, the movable plate 6 is installed so as not to interfere with the exhaust valve. Next, the operation of the present invention configured as described above will be explained using FIG.
is pressed against the piston top 2a, and the spring 1
Since a force of 1 is also applied, the movable plate 6 moves integrally with the piston top 2a in close contact with the piston top 2a as shown in a. At the end of the above-mentioned stroke, the speed of the piston 2 rapidly decreases, so that the movable plate 6 comes to fly out against the spring 11 as shown in b due to inertia. Thereafter, the inertial force decreases, and the force of the spring 11 acts to push down the movable plate 6 and bring it into close contact with the piston top 2a.At this time, the movable plate 6 and the piston top 2a
The air-fuel mixture that has entered between the two is ejected as shown in c.
In this way, at the end of the compression stroke, the movable plate 6 pops out or moves backward, causing turbulence in the air-fuel mixture. Immediately after such turbulence occurs, it is ignited by the spark plug, and the flame is ignited by the turbulent flow. Combustion occurs with rapid propagation.
以上の説明から明らかなように本考案による
と、ピストン往復運動時の上死点前の圧縮行程終
期における慣性力を利用して、可動板６を飛び出
し及び後退移動して混合気に乱れを生じ、着火燃
焼の際に効果的に乱流を生成するので、火炎の伝
播を速くして燃焼効率を有効に向上することがで
きる。また、構造は簡単であり、他の行程におい
て不具合を生じることもない。
As is clear from the above description, according to the present invention, the movable plate 6 is moved forward and backward by utilizing the inertia force at the end of the compression stroke before the top dead center during the reciprocating movement of the piston, causing turbulence in the air-fuel mixture. Since turbulence is effectively generated during ignition combustion, flame propagation can be accelerated and combustion efficiency can be effectively improved. Furthermore, the structure is simple and no problems occur during other processes.
第１図は本考案によるピストンの一実施例を示
す断面図、第２図ａないしｃは動作状態を示す説
明図である。
２……ピストン、２ａ……ピストン頂部、６…
…可動板、７……ロツド、１０……スプリング受
け、１１……スプリング。
FIG. 1 is a sectional view showing an embodiment of a piston according to the present invention, and FIGS. 2a to 2c are explanatory views showing operating states. 2... Piston, 2a... Piston top, 6...
...Movable plate, 7...Rod, 10...Spring receiver, 11...Spring.
Claims (1)
け、且つ該可動板にそれを上記ピストン頂部に密
着すべくピストン本体内でスプリングを付勢し、
ピストン往復運動時の特に上死点直前で慣性力に
より上記可動板を飛び出すように構成したことを
特徴とするピストン。 A heat-resistant movable plate is movably provided on the top of the piston, and a spring is applied to the movable plate within the piston body to bring it into close contact with the top of the piston,
A piston characterized in that the movable plate is configured to pop out due to inertia force, particularly immediately before top dead center during reciprocating movement of the piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6301482U JPS58163633U (en) | 1982-04-27 | 1982-04-27 | piston |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6301482U JPS58163633U (en) | 1982-04-27 | 1982-04-27 | piston |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58163633U JPS58163633U (en) | 1983-10-31 |
| JPS6218663Y2 true JPS6218663Y2 (en) | 1987-05-13 |
Family
ID=30073135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6301482U Granted JPS58163633U (en) | 1982-04-27 | 1982-04-27 | piston |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58163633U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU632265B2 (en) * | 1987-05-18 | 1992-12-24 | Takeshi Okuma | Combustion promoter for internal combustion engines |
-
1982
- 1982-04-27 JP JP6301482U patent/JPS58163633U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58163633U (en) | 1983-10-31 |
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