JPH0133654B2 - - Google Patents
Info
- Publication number
- JPH0133654B2 JPH0133654B2 JP58127475A JP12747583A JPH0133654B2 JP H0133654 B2 JPH0133654 B2 JP H0133654B2 JP 58127475 A JP58127475 A JP 58127475A JP 12747583 A JP12747583 A JP 12747583A JP H0133654 B2 JPH0133654 B2 JP H0133654B2
- Authority
- JP
- Japan
- Prior art keywords
- piston
- pressure air
- ring
- dead center
- air introduction
- 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
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J1/00—Pistons; Trunk pistons; Plungers
- F16J1/08—Constructional features providing for lubrication
-
- 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
- F02F3/00—Pistons
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Description
【発明の詳細な説明】
＜産業上の利用分野＞
本発明は内燃機関のピストントツプランド部に
燃焼残渣物が侵入することを防止する手段に関す
るものである。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to means for preventing combustion residues from entering the piston top land portion of an internal combustion engine.
＜発明の背景＞
近年、舶用デイーゼル機関に使用されている燃
料油の質が低下し、燃料油中に微細な硬質粒子が
混在する場合が多く、燃料油がシリンダ内で燃焼
すると、硬質粒子を含む燃焼残渣物が高温燃焼ガ
スと共にピストンとシリンダライナ間に入り込
み、シリンダライナの摩耗を増大させる。<Background of the Invention> In recent years, the quality of fuel oil used in marine diesel engines has deteriorated, and the fuel oil often contains fine hard particles.When the fuel oil is burnt in the cylinder, hard particles are released. The combustion residues contained therein enter between the piston and the cylinder liner together with the high-temperature combustion gas, increasing wear on the cylinder liner.
＜従来技術＞
上記の解決手段として本出願人が先に出願した
特願昭57−71864号がある。これはシリンダライ
ナ内を往復動する内燃機関用ピストンとシリンダ
の組合せにおいて、ピストンのトツプリングと２
番目のピストンリングとの間に全周にわたり環状
溝を構成すると共に、シリンダライナには高圧空
気供給装置からの高圧空気導入部を上死点付近に
おける前記ピストンの環状溝の位置に開口させ、
燃焼時にシリンダ内燃焼圧力より高い圧力の空気
をトツプリングを通して燃焼室内へ噴出させてな
る内燃機関用ピストン装置である。この特許出願
のものは硬質粒子を含む燃焼残渣物がピストンと
シリンダライナ間に入り込むのを防ぐことは可能
であるが、燃焼時にピストンが下降するとシリン
ダライナの高圧空気導入部開口が燃焼室内に露出
するため、燃焼ガスに曝されシリンダライナの汚
損のおそれがあつた。<Prior Art> As a means of solving the above problem, there is Japanese Patent Application No. 1983-71864, which was previously filed by the present applicant. This is a combination of a piston and a cylinder for an internal combustion engine that reciprocates within the cylinder liner, and the piston's top ring and the two
An annular groove is formed along the entire circumference between the cylinder liner and the second piston ring, and a high pressure air introduction part from a high pressure air supply device is opened in the cylinder liner at a position of the annular groove of the piston near the top dead center,
This is a piston device for an internal combustion engine that injects air at a pressure higher than the combustion pressure in the cylinder into the combustion chamber through a top ring during combustion. The patent application can prevent combustion residues containing hard particles from entering between the piston and cylinder liner, but when the piston descends during combustion, the high-pressure air introduction opening of the cylinder liner is exposed inside the combustion chamber. Therefore, there was a risk that the cylinder liner would be contaminated due to exposure to combustion gas.
＜発明の目的＞
これに対して、本発明は前記と同じくシリンダ
ライナの摩耗を防ぐと共に、ピストンの下死点に
おいても高圧空気導入部開口が燃焼室内に露出し
ないようにし、シリンダライナ汚損の原因を除去
したものである。<Purpose of the Invention> In contrast, the present invention prevents the wear of the cylinder liner as described above, and also prevents the high-pressure air introduction opening from being exposed inside the combustion chamber even at the bottom dead center of the piston, thereby eliminating the cause of cylinder liner fouling. is removed.
＜発明の構成＞
以下本発明を実施例を示す図によつて説明す
る。第１図はピストンが上死点付近にある場合、
第２図はピストンが下死点付近にある場合を示
す。図においてピストン２はシリンダライナ１内
に摺嵌し往復動する。ピストン２のトツプリング
３と２番目のピストンリング４との間に全周にわ
たり環状の溝５を設ける。また、ピストン２の下
部に２条の下部リング６，６′を間隔をあけて囲
周させ、この２条の下部リング６，6′の間に設け
た開口８と上記環状溝５とを連通する連絡管路７
をピストン２内に設ける。一方、シリンダライナ
１には、ピストン２の往復動時において、ピスト
ン２が下死点にまで下降しても燃焼室に露出しな
いよう、少くともピストンの下死点においてピス
トンのトツプリング３よりも下で、かつ２番目の
ピストンリング４よりも上の位置に高圧空気導入
部開口を設ける。而して、シリンダライナ１に設
ける高圧空気導入部開口９をピストン２の上死点
における前記２条の下部リング６，６′の位置に
開口させ、その位置は高圧空気の圧力損失が少い
ように、なるべくピストン連絡管路開口８と一致
させるようにする。シリンダライナ壁面に設けた
高圧空気導入部開口９には別に設けた高圧空気供
給装置からの空気導入管１６を接続し開口させて
ある。高圧空気の供給は高圧コンプレツサ１１で
シリンダ内燃焼圧力より高い圧力の高圧空気を冷
却装置１２を経由して高圧ボンベ１３に蓄えてお
き、これを弁開閉制御装置１４により制御弁１０
を開閉作動させて行つている。<Structure of the Invention> The present invention will be explained below with reference to figures showing embodiments. Figure 1 shows when the piston is near top dead center,
FIG. 2 shows a case where the piston is near the bottom dead center. In the figure, a piston 2 is slidably fitted into a cylinder liner 1 and reciprocates. An annular groove 5 is provided over the entire circumference between a top ring 3 of a piston 2 and a second piston ring 4. Further, two lower rings 6, 6' are arranged around the lower part of the piston 2 at an interval, and the opening 8 provided between the two lower rings 6, 6' communicates with the annular groove 5. Connecting pipe 7
is provided inside the piston 2. On the other hand, the cylinder liner 1 is provided at least as far as the top ring 3 of the piston at the bottom dead center of the piston so that it will not be exposed to the combustion chamber even if the piston 2 descends to the bottom dead center during reciprocating movement of the piston 2. A high pressure air introduction opening is provided below and above the second piston ring 4. Therefore, the high-pressure air introduction opening 9 provided in the cylinder liner 1 is opened at the position of the two lower rings 6, 6' at the top dead center of the piston 2, and the position is such that the pressure loss of the high-pressure air is small. As much as possible, it should be aligned with the piston communication pipe opening 8. An air introduction pipe 16 from a separately provided high pressure air supply device is connected to and opened to the high pressure air introduction opening 9 provided on the cylinder liner wall surface. The high-pressure air is supplied by a high-pressure compressor 11, which stores high-pressure air at a pressure higher than the cylinder internal combustion pressure in a high-pressure cylinder 13 via a cooling device 12.
It is operated by opening and closing.
この制御弁１０は弁開閉装置１４によりピスト
ンが上昇行程で上死点に近づき、ピストンの下部
リングの上側のリング６が高圧空気導入部開口９
を通過すると同時に高圧空気の送給を開始し、次
いでピストン２が上死点よりの下降行程で前記リ
ング６が高圧空気導入部開口９の位置にくる直前
で高圧空気の供給を停止するようにセツトさされ
ている。 This control valve 10 is controlled by the valve opening/closing device 14 when the piston approaches the top dead center during the upward stroke, and the upper ring 6 of the lower ring of the piston is opened at the high pressure air introduction opening 9.
The supply of high-pressure air is started as soon as the piston 2 passes through the top dead center, and the supply of high-pressure air is stopped immediately before the ring 6 reaches the position of the high-pressure air introduction opening 9 during the downward stroke of the piston 2 from the top dead center. It is set.
＜作用＞
いま、ピストン２が上昇し、上死点に近づいた
下部リングの上側のリング６が高圧空気導入部開
口９を通り過ぎると、弁開閉制御装置１４により
制御される制御弁１０が開となり、高圧空気が下
部リング６，６′間に導入され、ピストン内に設
けられた連絡管路７を通りトツプリング直下の環
状溝に充填される。この高圧空気の圧力は燃焼時
のガス圧力よりも高い圧力であるから、この環状
溝部５からの正常な高圧空気がトツプリング３を
通つてその全周囲からシリンダ内燃焼室へ噴出す
る。この高圧空気の噴出は、ピストンが上死点を
通過し下降行程に移つて下部リングの上側リング
６が高圧空気導入部開口９の位置にくる直前ま
で、すなわちシリンダ内で燃料が燃焼している間
継続する。その噴出する空気がピストントツプラ
ンド１５とシリンダライナ１間の隙間に入り込も
うとする燃焼ガスおよび燃焼残渣物を燃焼室へ押
しもどす作用をする。次いで、ピストン２が下降
し、下死点に達してもシリンダライナの高圧空気
導入部開口９はいぜんピストンによつて隠され、
燃焼室内に露出することがない。<Operation> Now, when the piston 2 is rising and the upper ring 6 of the lower ring, which has approached the top dead center, passes the high pressure air introduction opening 9, the control valve 10 controlled by the valve opening/closing control device 14 is opened. High-pressure air is introduced between the lower rings 6, 6', passes through a connecting pipe 7 provided in the piston, and fills the annular groove immediately below the top ring. Since the pressure of this high-pressure air is higher than the gas pressure during combustion, normal high-pressure air from the annular groove 5 passes through the top ring 3 and is ejected from its entire periphery into the combustion chamber in the cylinder. This jet of high-pressure air continues until the piston passes the top dead center and begins its downward stroke, and the upper ring 6 of the lower ring reaches the position of the high-pressure air introduction opening 9, that is, until the fuel is combusted within the cylinder. Continues for a while. The ejected air serves to push back into the combustion chamber combustion gas and combustion residues that try to enter the gap between the piston toppland 15 and the cylinder liner 1. Next, even when the piston 2 descends and reaches the bottom dead center, the high pressure air introduction opening 9 of the cylinder liner is still hidden by the piston.
No exposure inside the combustion chamber.
＜発明の効果＞
上述した如く、本発明は内燃機関の燃焼時にピ
ストンのトツプリングと２番目のピストンリング
間の環状溝部に積極的にシリンダ内最高圧力より
高圧の空気を導入し、トツプリングを通して燃焼
室内に清浄空気を噴出させていることにより、燃
焼ガス中の燃焼残渣物によりピストンリング及び
シリンダライナの異常摩耗を防止するとともに、
高圧空気導入部開口を、下死点におけるピストン
のトツプリング以下に位置に設けたので、前記開
口が燃焼ガスに曝されることがなく、シリンダラ
イナの汚損のおそれがない。<Effects of the Invention> As described above, the present invention actively introduces air at a pressure higher than the maximum pressure inside the cylinder into the annular groove between the top ring of the piston and the second piston ring during combustion in an internal combustion engine, and air is introduced through the top ring. By blowing clean air into the combustion chamber, abnormal wear of piston rings and cylinder liners due to combustion residues in the combustion gas is prevented, and
Since the high-pressure air introduction opening is provided at a position below the top ring of the piston at bottom dead center, the opening is not exposed to combustion gas and there is no risk of contamination of the cylinder liner.
図面は本発明の構成を説明するための系統図及
び一部断面図で、第１図はピストンの上死点にお
ける状態、第２図はピストンの下死点における状
態を示す。
１……シリンダライナ、２……ピストン、３…
…トツプリング、４……２番目のピストンリン
グ、５……環状溝、６，６′……リング、７……
連絡管路、８……連絡管路開口、９……高圧空気
導入部開口、１０……高圧空気供給装置、１１…
…高圧コンプレツサ、１２……冷却装置、１３…
…高圧ボンベ、１４……弁開閉制御装置、１５…
…ピストントツプランド、１６……空気導入管。
The drawings are a system diagram and a partial sectional view for explaining the structure of the present invention, and FIG. 1 shows the state of the piston at the top dead center, and FIG. 2 shows the state of the piston at the bottom dead center. 1...Cylinder liner, 2...Piston, 3...
...Top ring, 4...Second piston ring, 5...Annular groove, 6,6'...Ring, 7...
Connecting pipe line, 8... Connecting pipe opening, 9... High pressure air introduction opening, 10... High pressure air supply device, 11...
...High pressure compressor, 12...Cooling device, 13...
...High pressure cylinder, 14...Valve opening/closing control device, 15...
...Piston totsuprand, 16...Air introduction pipe.
Claims (1)
くとも下死点におけるピストンのトツプリング以
下の位置に高圧空気導入部を開口させ、これに高
圧空気供給装置からの空気導入管を接続すると共
に、ピストンのトツプリングと２番目のピストン
リングとの間に全周にわたり環状溝を構成し、ピ
ストンの上死点においてこの環状溝が前記高圧空
気導入部開口と連通する連絡管路をピストン内に
設けてなる内燃機関のピストン装置。 ２ 前記連絡管路の下端が２条のピストンリング
間に開口してなる特許請求の範囲第１項に記載の
内燃機関のピストン装置。[Scope of Claims] 1. A high-pressure air introduction part is opened at a position below the top ring of the piston at the bottom dead center of the cylinder liner into which the piston is slidably fitted, and an air introduction pipe from the high-pressure air supply device is connected to this part. a connecting pipe connecting the top ring of the piston and the second piston ring, and forming an annular groove along the entire circumference between the top ring of the piston and the second piston ring, and this annular groove communicating with the high pressure air introduction opening at the top dead center of the piston. A piston device for an internal combustion engine, which is provided in the piston. 2. The piston device for an internal combustion engine according to claim 1, wherein the lower end of the communication pipe is opened between two piston rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12747583A JPS6019949A (en) | 1983-07-12 | 1983-07-12 | Piston for internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12747583A JPS6019949A (en) | 1983-07-12 | 1983-07-12 | Piston for internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6019949A JPS6019949A (en) | 1985-02-01 |
| JPH0133654B2 true JPH0133654B2 (en) | 1989-07-14 |
Family
ID=14960846
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12747583A Granted JPS6019949A (en) | 1983-07-12 | 1983-07-12 | Piston for internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6019949A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT500738B8 (en) * | 2003-07-08 | 2007-02-15 | Avl List Gmbh | Combustion engine with at least one piston moving in a cylinder |
| JP6090303B2 (en) * | 2014-12-24 | 2017-03-08 | マツダ株式会社 | engine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5367011A (en) * | 1976-11-26 | 1978-06-15 | Toyota Motor Corp | Exhaust gas purifying train |
-
1983
- 1983-07-12 JP JP12747583A patent/JPS6019949A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6019949A (en) | 1985-02-01 |
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