JPH0649855Y2 - 2-cycle diesel engine - Google Patents
2-cycle diesel engineInfo
- Publication number
- JPH0649855Y2 JPH0649855Y2 JP3157489U JP3157489U JPH0649855Y2 JP H0649855 Y2 JPH0649855 Y2 JP H0649855Y2 JP 3157489 U JP3157489 U JP 3157489U JP 3157489 U JP3157489 U JP 3157489U JP H0649855 Y2 JPH0649855 Y2 JP H0649855Y2
- Authority
- JP
- Japan
- Prior art keywords
- fresh air
- wall
- valve
- exhaust valve
- vertical plane
- 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 - Lifetime
Links
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】 〔産業上の利用分野〕 本考案は２サイクルディーゼル機関に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a two-stroke diesel engine.
シリンダヘッドに給気弁および排気弁を設けた副室付２
サイクルディーゼル機関において、排気弁側の給気弁開
口を覆うマスク型を排気弁と給気弁を含む垂直平面内に
配置してこの垂直平面内において新気をループ状に流通
せしめ、この垂直平面から離れたシリンダヘッド内壁面
周辺部に副室の噴口に配置するようにした２サイクルデ
ィーゼル機関が本出願人により既に提案されている（実
願平１−9445号参照）。Cylinder head with auxiliary chamber with air supply valve and exhaust valve 2
In a cycle diesel engine, a mask type that covers the intake valve opening on the exhaust valve side is placed in a vertical plane that includes the exhaust valve and the intake valve, and fresh air is circulated in a loop in this vertical plane. A two-cycle diesel engine has been already proposed by the applicant of the present invention, which is arranged in the injection port of the auxiliary chamber in the peripheral part of the inner wall surface of the cylinder head (see Japanese Patent Application No. 1-9445).
しかしながらこのように排気弁側の給気弁開口を覆うマ
スク壁を給気弁と排気弁を含む垂直平面内に配置すると
新気が主にこの垂直平面内をループ状をなして流れるた
めにこの垂直平面から離れた領域は多量の既燃ガスが残
留したままとなっている。従って副室の噴口をこの垂直
平面から離れたシリンダヘッド内壁面周辺部に配置する
と圧縮行程時に多量の既燃ガスが噴口を介して副室内に
送り込まれることとなり、斯くして副室内の新気ガスが
不十分になるために副室内において良好な着火燃焼が確
保できないという問題を生ずる。However, when the mask wall that covers the intake valve opening on the exhaust valve side is arranged in the vertical plane including the intake valve and the exhaust valve in this manner, the fresh air mainly flows in a loop in the vertical plane. A large amount of burned gas remains in the area away from the vertical plane. Therefore, if the injection port of the sub chamber is arranged near the inner wall surface of the cylinder head away from the vertical plane, a large amount of burned gas is sent into the sub chamber through the injection port during the compression stroke, and thus the fresh air in the sub chamber is discharged. There is a problem that good ignition and combustion cannot be secured in the sub-chamber due to insufficient gas.
上記問題点を解決するために本考案によればシリンダヘ
ッドに給気弁および排気弁を設けた副室付２サイクルデ
ィーゼル機関において、排気弁側の給気弁周辺部に排気
弁側の給気弁開口からの新気の流入を抑制する新気流入
抑制壁を設け、この新気流入抑制壁を給気弁と排気弁を
含む垂直平面に対し給気弁の周辺方向にずらして形成す
ると共にこの垂直平面に関し新気流入抑制壁のずれ方向
と反対方向のシリンダヘッド内壁面周辺部に副室の噴口
を配置している。In order to solve the above problems, according to the present invention, in a two-cycle diesel engine with a sub chamber in which a cylinder head is provided with an intake valve and an exhaust valve, the exhaust valve side intake air is provided around the exhaust valve side intake valve. A fresh air inflow suppression wall is provided to suppress the inflow of fresh air from the valve opening, and the fresh air inflow suppression wall is formed by being displaced in the peripheral direction of the intake valve with respect to a vertical plane including the intake valve and the exhaust valve. With respect to this vertical plane, the injection port of the sub chamber is arranged in the peripheral portion of the inner wall surface of the cylinder head in the direction opposite to the direction of displacement of the fresh air inflow suppressing wall.
新気流入抑制壁のずれ方向と反対方向には新気の一部が
送り込まれる。従ってこの方向に副室の噴口を配置する
ことによって圧縮行程時に新気が噴口から副室内に送り
込まれる。A part of fresh air is sent in the direction opposite to the direction in which the fresh air inflow restraint wall is displaced. Therefore, by arranging the nozzle of the sub chamber in this direction, fresh air is sent from the nozzle into the sub chamber during the compression stroke.
第１図および第２図を参照すると、１はシリンダブロッ
ク、２はシリンダブロック１内で往復動するピストン、
３はシリンダヘッド、４はピストン２の平坦な頂面とシ
リンダヘッド３の平坦な内壁面間に形成された燃焼室、
５は給気弁、６は給気ポート、７は排気弁、８は排気ポ
ート、９は副室、10はシリンダヘッド３の内壁面と同一
平面内に配置された副室９の噴口、11は副室９内に燃料
を噴射するための燃料噴射弁を夫々示す。Referring to FIGS. 1 and 2, 1 is a cylinder block, 2 is a piston reciprocating in the cylinder block 1,
3 is a cylinder head, 4 is a combustion chamber formed between the flat top surface of the piston 2 and the flat inner wall surface of the cylinder head 3,
Reference numeral 5 is an air supply valve, 6 is an air supply port, 7 is an exhaust valve, 8 is an exhaust port, 9 is a sub-chamber, 10 is an injection port of a sub-chamber 9 arranged in the same plane as the inner wall surface of the cylinder head 3, 11 Indicate fuel injection valves for injecting fuel into the sub chamber 9, respectively.
第１図に示されるようにシリンダヘッド３の内壁面上に
は凹溝12が形成され、この凹溝12の奥部に給気弁５に対
する弁座13が配置される。従って給気弁５が弁座13に着
座したときには給気弁５は凹溝12内に引込むことにな
る。排気弁７側の凹溝12の周壁は給気弁５のかさ部外周
縁に近接配置された円筒状に形成され、従ってこの円筒
状周壁は排気弁７側の給気弁５の開口を覆うマスク壁14
を形成する。一方、マスク壁14と反対側の凹溝12の周壁
部分15は燃焼室４内に向けて拡開する円錐状に形成され
る。第２図に示されるようにマスク壁14は給気弁５と排
気弁７を含む垂直平面Ａ−Ａに対し給気弁５の周辺方向
にずらして形成されており、マスク壁14の端部のみが垂
直平面Ａ−Ａ上に配置する。このマスク壁14は給気弁５
のかさ部外周縁に沿ってそのほぼ1/4周に亘って延びて
おり、残りのほぼ3/4周は円錐状周壁部分15となってい
る。As shown in FIG. 1, a concave groove 12 is formed on the inner wall surface of the cylinder head 3, and a valve seat 13 for the air supply valve 5 is arranged in the inner part of the concave groove 12. Therefore, when the air supply valve 5 is seated on the valve seat 13, the air supply valve 5 is pulled into the groove 12. The peripheral wall of the recessed groove 12 on the exhaust valve 7 side is formed in a cylindrical shape arranged close to the outer peripheral edge of the bulge portion of the air supply valve 5, so that this cylindrical peripheral wall covers the opening of the air supply valve 5 on the exhaust valve 7 side. Mask wall 14
To form. On the other hand, the peripheral wall portion 15 of the concave groove 12 on the side opposite to the mask wall 14 is formed in a conical shape that expands toward the inside of the combustion chamber 4. As shown in FIG. 2, the mask wall 14 is formed so as to be displaced in the peripheral direction of the air supply valve 5 with respect to a vertical plane AA including the air supply valve 5 and the exhaust valve 7, and an end portion of the mask wall 14 is formed. Only place on the vertical plane A-A. This mask wall 14 is the air supply valve 5
Along the outer peripheral edge of the bulge portion, it extends over approximately 1/4 of the circumference, and the remaining approximately 3/4 circumference is a conical peripheral wall portion 15.
従って給気弁５が開弁すると大部分の新気は矢印S1で示
すようにマスク壁14と反対側の円錐状内周壁15に沿って
燃焼室４内に流入することになる。従ってマスク壁14は
排気弁７側の給気弁５開口からの新気の流入を抑制する
新気流入抑制壁を形成していることがわかる。次いで新
気はシリンダ内壁面に沿って下降し、次いでピストン２
の頂面に沿ってピストン２の頂面を横切り、次いで再び
シリンダ内壁面に沿って上昇するために燃焼室４内には
強力なループ掃気流S1が発生せしめられる。燃焼室４内
の既燃ガスはこのループ掃気流S1によって順次排気弁７
を介して排気ポート８内に押し出される。Therefore, when the air supply valve 5 is opened, most of the fresh air flows into the combustion chamber 4 along the conical inner peripheral wall 15 on the side opposite to the mask wall 14 as shown by the arrow S 1 . Therefore, it can be seen that the mask wall 14 forms a fresh air inflow suppressing wall that suppresses inflow of fresh air from the opening of the air supply valve 5 on the exhaust valve 7 side. Then, the fresh air descends along the inner wall surface of the cylinder, and then the piston 2
A strong loop scavenging air S 1 is generated in the combustion chamber 4 in order to traverse the top surface of the piston 2 along the top surface of the cylinder 2 and then rise again along the inner wall surface of the cylinder. The burnt gas in the combustion chamber 4 is sequentially exhausted by the loop scavenging air S 1 through the exhaust valve 7
Is extruded into the exhaust port 8 via.
ところでマスク壁14が垂直平面Ａ−Ａに対して給気弁５
の周辺方向へずれた位置に形成されているので大部分の
新気は垂直平面Ａ−Ａと異なる垂直平面内においてルー
プ状に流れることになる。一方、給気弁５が開弁すると
前述したように大部分の新気はマスク壁14と反対側の給
気弁５の開口から燃焼室４内に流入するが一部の新気は
矢印S2，S3で示されるようにマスク壁14と給気弁５の軸
線を含む垂直平面Ｂ−Ｂに対して横方向に流入する。と
ころで第２図に示すように噴口10は垂直平面Ａ−Ａに関
してマスク壁14のずれ方向と反対方向のシリンダヘッド
３の内壁面周辺部、即ち新気流S2の進行方向に配置され
ており、従って圧縮行程が開始されるころには噴口10下
方の燃焼室４の周辺領域には多量の新気が存在すること
になる。従って圧縮行程が開始されると多量の新気が噴
口10を介して副室９内に押し込まれることになり、斯く
して副室９内に噴射された燃料が良好に着火燃焼せしめ
られることになる。By the way, the mask wall 14 is connected to the vertical plane A-A with the air supply valve 5
Since most of the fresh air is formed at a position displaced in the peripheral direction of, the air flows in a loop in a vertical plane different from the vertical plane AA. On the other hand, when the air supply valve 5 is opened, most of the fresh air flows into the combustion chamber 4 through the opening of the air supply valve 5 on the side opposite to the mask wall 14 as described above, but some of the fresh air is indicated by the arrow S. 2 and S 3 flow in a lateral direction with respect to a vertical plane B-B including the axis of the mask wall 14 and the air supply valve 5. By the way, as shown in FIG. 2, the injection port 10 is arranged in the peripheral portion of the inner wall surface of the cylinder head 3 in the direction opposite to the displacement direction of the mask wall 14 with respect to the vertical plane AA, that is, in the traveling direction of the new air flow S 2 . Therefore, when the compression stroke is started, a large amount of fresh air exists in the peripheral region of the combustion chamber 4 below the injection port 10. Therefore, when the compression stroke is started, a large amount of fresh air is pushed into the sub chamber 9 through the injection port 10, and thus the fuel injected into the sub chamber 9 is satisfactorily ignited and burned. Become.
第３図から第５図に別の実施例を示す。この実施例にお
いて第１図および第２図に示す実施例と同様な構成要素
は同一の符号で示す。Another embodiment is shown in FIGS. In this embodiment, components similar to those in the embodiment shown in FIGS. 1 and 2 are designated by the same reference numerals.
第３図から第５図に示されるようにこの実施例では給気
弁５に対する弁座13がシリンダヘッド３の内壁面上に配
置されており、従ってこの実施例では第１図に示すよう
な凹溝12は形成されていない。これに対してこの実施例
では排気弁７側の給気弁ポート６出口部内周壁面上に新
気ガイド壁16が形成されている。この新気ガイド壁16は
新気を新気ガイド壁16と反対側の給気弁５の開口に向け
て案内するために給気弁５のかさ部に近づくに従って給
気弁５の軸線に近づくように傾斜配置されている。更に
第４図および第５図に示されるようにこの新気ガイド壁
16はほぼ二等辺三角形状の断面形状を有し、従って最も
突出している稜線16aの両側に平面状をなす一対のガイ
ド面16b,16cを有する。給気弁５が開弁すると大部分の
新気は新気ガイド壁16により案内されてこの新気ガイド
壁16と反対側の給気弁５の開口から燃焼室４内に流入
し、斯くしてこの新気ガイド壁16は排気弁７側の給気弁
５開口からの新気の流入を抑制する新気流入抑制壁を形
成していることがわかる。次いで新気はシリンダ内壁面
に沿って下降し、次いでピストン２の頂面に沿ってピス
トン２の頂面を横切り、次いで再びシリンダ内壁面に沿
って上昇するために燃焼室４内には強力なループ掃気流
S1が発生せしめられる。燃焼室４内の既燃ガスはこのル
ープ掃気流S1によって順次排気弁７を介して排気ポート
８内に押し出される。As shown in FIGS. 3 to 5, in this embodiment, the valve seat 13 for the air supply valve 5 is arranged on the inner wall surface of the cylinder head 3, so that in this embodiment, as shown in FIG. The groove 12 is not formed. On the other hand, in this embodiment, the fresh air guide wall 16 is formed on the inner peripheral wall surface of the outlet of the intake valve port 6 on the exhaust valve 7 side. The fresh air guide wall 16 approaches the axis of the intake valve 5 as it approaches the bulk of the intake valve 5 in order to guide the fresh air toward the opening of the intake valve 5 on the side opposite to the fresh air guide wall 16. It is arranged so as to be inclined. Further, as shown in FIGS. 4 and 5, this fresh air guide wall
The cross section 16 has a substantially isosceles triangular cross section, and therefore has a pair of flat guide surfaces 16b and 16c on both sides of the most protruding ridge line 16a. When the intake valve 5 is opened, most of the fresh air is guided by the fresh air guide wall 16 and flows into the combustion chamber 4 through the opening of the intake valve 5 on the side opposite to the fresh air guide wall 16, It can be seen that the lever fresh air guide wall 16 forms a fresh air inflow suppression wall that suppresses the inflow of fresh air from the opening of the air supply valve 5 on the exhaust valve 7 side. Then, the fresh air descends along the inner wall surface of the cylinder, then crosses the top surface of the piston 2 along the top surface of the piston 2, and then rises again along the inner wall surface of the cylinder. Loop sweep
S 1 is generated. The burnt gas in the combustion chamber 4 is sequentially pushed out by the loop scavenging air S 1 into the exhaust port 8 via the exhaust valve 7.
ところで新気ガイド壁16が垂直平面Ａ−Ａに対して給気
弁５の周辺方向へずれた位置に形成されているので大部
分の新気は垂直平面Ａ−Ａと異なる垂直平面内において
ループ状に流れることになる。一方、給気弁５が開弁す
ると前述したように大部分の新気は新気ガイド壁16と反
対側の給気弁５の開口から燃焼室４内に流入するが一部
の新気は矢印S2，S3で示されるように新気ガイド壁16の
各ガイド面16b,16cにより案内されて新気ガイド壁16と
給気弁５の軸線を含む垂直平面に対して横方向に流入す
る。ところで第２図に示すように噴口10は垂直平面Ａ−
Ａに関して新気ガイド壁16のずれ方向と反対方向のシリ
ンダヘッド３の内壁面周辺部、即ち新気流S2の進行方向
に配置されており、従って圧縮行程が開始されるころに
は噴口10下方の燃焼室４の周辺領域には多量の新気が存
在することになる。従って圧縮行程が開始されると多量
の新気が噴口10を介して副室９内に押し込まれることに
なり、斯くして副室９内に噴射された燃料が良好に着火
燃焼せしめられることになる。By the way, since the fresh air guide wall 16 is formed at a position displaced in the peripheral direction of the air supply valve 5 with respect to the vertical plane AA, most of the fresh air is looped in a vertical plane different from the vertical plane AA. It will flow in a shape. On the other hand, when the intake valve 5 is opened, as described above, most of the fresh air flows into the combustion chamber 4 through the opening of the intake valve 5 on the side opposite to the fresh air guide wall 16, but part of the fresh air flows transversely to the vertical plane containing the axis of the arrow S 2, S 3 fresh air is guided by the guide surfaces 16b, 16c of the fresh air guide wall 16 as indicated by the guide wall 16 and the air supply valve 5 To do. By the way, as shown in FIG. 2, the nozzle 10 has a vertical plane A-
With respect to A, it is arranged in the peripheral portion of the inner wall surface of the cylinder head 3 in the direction opposite to the direction in which the fresh air guide wall 16 is displaced, that is, in the advancing direction of the new air flow S 2. Therefore, when the compression stroke is started, A large amount of fresh air is present in the peripheral area of the combustion chamber 4 of FIG. Therefore, when the compression stroke is started, a large amount of fresh air is pushed into the sub chamber 9 through the injection port 10, and thus the fuel injected into the sub chamber 9 is satisfactorily ignited and burned. Become.
強力なループ掃気によって燃焼室内の既燃ガスを十分に
掃気しつつ副室内に十分な量の新気を押し込むことがで
き、斯くして副室内における良好な着火燃焼を確保する
ことができる。Strong loop scavenging can sufficiently scaveng the burnt gas in the combustion chamber and push a sufficient amount of fresh air into the sub chamber, thus ensuring good ignition and combustion in the sub chamber.
第１図は第２図のＩ−Ｉ線に沿ってみた２サイクルディ
ーゼル機関の側面断面図、第２図は第１図のシリンダヘ
ッドの底面図、第３図は第４図のIII−III線に沿ってみ
た２サイクルディーゼル機関の別の実施例の側面断面
図、第４図は第３図のシリンダヘッドの底面図、第５図
は図解的に示す給気ポート出口部の斜視図である。 ５……給気弁、６……給気ポート、 ８……排気弁、８……排気ポート、 ９……副室、10……噴口、 14……マスク壁、16……新気ガイド壁。1 is a side sectional view of a two-stroke diesel engine taken along the line I-I of FIG. 2, FIG. 2 is a bottom view of the cylinder head of FIG. 1, and FIG. 3 is III-III of FIG. FIG. 4 is a side sectional view of another embodiment of the two-stroke diesel engine taken along the line, FIG. 4 is a bottom view of the cylinder head of FIG. 3, and FIG. 5 is a perspective view of the air supply port outlet portion schematically shown. is there. 5 ... Air supply valve, 6 ... Air supply port, 8 ... Exhaust valve, 8 ... Exhaust port, 9 ... Sub chamber, 10 ... Jet port, 14 ... Mask wall, 16 ... Fresh air guide wall .
フロントページの続き (72)考案者 金子 聡志 愛知県豊田市トヨタ町１番地 トヨタ自動 車株式会社内 (56)参考文献 特開 平１−280624（ＪＰ，Ａ) 特開 平１−290919（ＪＰ，Ａ) 実開 平２−107732（ＪＰ，Ｕ)Continuation of the front page (72) Creator Satoshi Kaneko 1 Toyota Town, Toyota City, Aichi Prefecture Toyota Motor Corporation (56) References JP-A-1-280624 (JP, A) JP-A-1-290919 (JP, A) Actual Kaihei 2-107732 (JP, U)
Claims (1)
けた副室付２サイクルディーゼル機関において、排気弁
側の給気弁周辺部に排気弁側の給気弁開口からの新気の
流入を抑制する新気流入抑制壁を設け、該新気流入抑制
壁を給気弁と排気弁を含む垂直平面に対し給気弁の周辺
方向にずらして形成すると共に該垂直平面に関し新気流
入抑制壁のずれ方向と反対方向のシリンダヘッド内壁面
周辺部に副室の噴口を配置した２サイクルディーゼル機
関。1. In a two-cycle diesel engine with a sub-chamber in which a cylinder head is provided with an intake valve and an exhaust valve, fresh air flows into an area around the exhaust valve side intake valve from an exhaust valve side intake valve opening. A fresh air inflow restraint wall is formed, and the fresh air inflow restraint wall is formed so as to be shifted in the peripheral direction of the air feed valve with respect to a vertical plane including the air supply valve and the exhaust valve, and the new air inflow restraint wall A two-cycle diesel engine in which the nozzles of the auxiliary chamber are arranged around the inner wall surface of the cylinder head in the opposite direction of the wall displacement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3157489U JPH0649855Y2 (en) | 1989-03-20 | 1989-03-20 | 2-cycle diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3157489U JPH0649855Y2 (en) | 1989-03-20 | 1989-03-20 | 2-cycle diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02122121U JPH02122121U (en) | 1990-10-05 |
| JPH0649855Y2 true JPH0649855Y2 (en) | 1994-12-14 |
Family
ID=31257526
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3157489U Expired - Lifetime JPH0649855Y2 (en) | 1989-03-20 | 1989-03-20 | 2-cycle diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0649855Y2 (en) |
-
1989
- 1989-03-20 JP JP3157489U patent/JPH0649855Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02122121U (en) | 1990-10-05 |
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