JPH0530426U - 2-valve diesel engine - Google Patents
2-valve diesel engineInfo
- Publication number
- JPH0530426U JPH0530426U JP7916891U JP7916891U JPH0530426U JP H0530426 U JPH0530426 U JP H0530426U JP 7916891 U JP7916891 U JP 7916891U JP 7916891 U JP7916891 U JP 7916891U JP H0530426 U JPH0530426 U JP H0530426U
- Authority
- JP
- Japan
- Prior art keywords
- surface portion
- curved surface
- diesel engine
- nozzle
- piston
- 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.)
- Granted
Links
- 238000002347 injection Methods 0.000 claims abstract description 40
- 239000007924 injection Substances 0.000 claims abstract description 40
- 239000000446 fuel Substances 0.000 claims abstract description 34
- 239000007921 spray Substances 0.000 claims abstract description 31
- 230000002093 peripheral effect Effects 0.000 claims abstract description 4
- 238000002485 combustion reaction Methods 0.000 abstract description 18
- 239000006185 dispersion Substances 0.000 abstract description 3
- 238000009827 uniform distribution Methods 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
(57)【要約】
【目的】 ピストンの軸芯に対してオフセット位置に燃
焼室を設け、この燃焼室に多噴孔ノズルを設けた２弁式
ディーゼル機関において、燃焼室に対する燃料噴霧の分
散・分布を均一にし、空気とのミキシングを良好にす
る。
【構成】ピストン頂面５に凹設されたキャビティ６内に
噴口部を臨ませて多噴孔ノズル９を傾けて設けたディー
ゼル機関において、上記キャビティ６の周側壁部分が、
ピストン４の軸芯方向に沿った垂直面部分７と、その垂
直面部分７の両端と連続する半円状の湾曲面部分８とか
ら成り、上記多噴孔ノズル９は上記湾曲面部分８のみに
燃料噴霧Ｆを分散させて噴出する噴孔１１を多数有して
上記湾曲面部分８の半径の中心Ｏ位置に設けられ、上記
湾曲面部分８の曲率半径Ｒが、各噴孔１１から噴出され
た燃料噴霧Ｆの飛翔距離Ｌを互いに等しくする半径に設
定されているものである。
(57) [Abstract] [Purpose] In a two-valve diesel engine in which a combustion chamber is provided at an offset position with respect to the axis of the piston, and a multi-hole nozzle is provided in this combustion chamber, the dispersion of fuel spray into the combustion chamber Uniform distribution and good mixing with air. [Constitution] In a diesel engine in which a multi-hole nozzle 9 is tilted with an injection port facing a cavity 6 recessed in a piston top surface 5, a peripheral side wall portion of the cavity 6 is
The piston 4 includes a vertical surface portion 7 along the axial direction and a semicircular curved surface portion 8 continuous with both ends of the vertical surface portion 7. The multiple injection hole nozzle 9 has only the curved surface portion 8. Is provided at the center O of the radius of the curved surface portion 8 having a large number of injection holes 11 for dispersing and ejecting the fuel spray F, and the radius of curvature R of the curved surface portion 8 is ejected from each injection hole 11. The flying distances L of the sprayed fuel sprays F are set to be equal to each other.
Description
【０００１】[0001]
本考案はピストンの燃焼室に対して多噴孔ノズルをオフセットさせて設けた２ 弁式ディーゼル機関に関する。 The present invention relates to a two-valve diesel engine in which a multi-hole nozzle is offset from a combustion chamber of a piston.
【０００２】[0002]
一般に１つの吸気弁、１つの排気弁で吸・排気を賄う２弁式ディーゼル機関に おいて、吸気ポート、排気ポートは、これら吸気・排気ポートによる体積効率を できるだけ大きなものとするために、大きな口径に設計されているが、このよう にすると、ピストンの燃焼室及び多噴孔ノズルは、シリンダの中心軸からオフセ ットさせた位置に設けざるを得ず、しかも多噴孔ノズルは、燃焼室に対して傾け て取付ざるを得ない。 Generally, in a two-valve diesel engine in which one intake valve and one exhaust valve cover intake and exhaust, the intake port and exhaust port are large in order to maximize the volumetric efficiency of these intake and exhaust ports. Although it is designed to have a caliber, the combustion chamber of the piston and the multi-hole nozzle must be installed at a position offset from the center axis of the cylinder. There is no choice but to tilt it to the room.
【０００３】[0003]
しかし、上述のように構成すると、多噴孔ノズルの軸芯線と噴孔との傾斜角及 び噴孔とキャビティ周壁面までの距離が噴孔ごとに異なってしまうため、燃焼室 の壁面と衝突する時の燃料噴霧の速度や、空間的な燃料の噴射量が不均一となっ て燃焼が悪化し、スモーク、燃費が悪化してしまうという問題があった。 However, when configured as described above, the inclination angle between the axis of the multi-hole nozzle and the nozzle holes and the distance between the nozzle holes and the wall surface of the cavity will differ for each nozzle hole, so that the collision with the wall surface of the combustion chamber There was a problem in that the speed of fuel spraying at the time of fuel injection and the spatial fuel injection amount became non-uniform, combustion deteriorated, and smoke and fuel consumption deteriorated.
【０００４】 なお、キャビティの周壁面を多噴孔ノズルの中心からほぼ等しい距離を隔てて 形成し、燃料噴霧の分散・分布を改善するようにした提案（「直接噴射式ディー ゼル機関のピストンヘッド構造」（実開昭59-18225号））がなされているが多噴 口ノズル側の混合気の濃度を他の部分と同程度に均一なものとするためには、キ ャビティの深さを深くせざるを得ないが、この場合はコンロッドとの緩衝の問題 が生じ容易に採用できるものではなかった。A proposal is made so that the peripheral wall surface of the cavity is formed at substantially equal distances from the center of the multi-hole nozzle to improve the dispersion and distribution of the fuel spray (“Piston head of direct injection diesel engine”). Structure ”(Actual Development No. 59-18225)), but in order to make the concentration of the air-fuel mixture on the multi-injection nozzle side as uniform as other parts, the depth of the cavity must be set. It must be deepened, but in this case there was a problem of buffering with the connecting rod and it was not easy to adopt.
【０００５】 本考案の目的は、２弁式ディーゼル機関において、燃焼室に対する燃料噴霧の 分散・分布を均一にし、空気とのミキシングを良好にすることにある。An object of the present invention is to make the distribution and distribution of the fuel spray in the combustion chamber uniform in the two-valve diesel engine and to improve the mixing with the air.
【０００６】[0006]
上記目的を達成するために、本考案は、ピストン頂面に凹設されたキャビティ 内に噴口部を臨ませて多噴孔ノズルを傾けて設けたディーゼル機関において、上 記キャビティの周側壁部分が、ピストンの軸芯方向に沿った垂直面部分と、その 垂直面部分の両端と連続する半円状の湾曲面部分とから成り、上記多噴孔ノズル は上記湾曲面部分のみに燃料噴霧を分散させて噴出する噴孔を多数有して上記湾 曲面部分の半径の中心位置に設けられ、上記湾曲面部分の曲率半径が、各噴孔か ら噴出された燃料噴霧の飛翔距離を互いに等しくする半径に設定されているもの である。 In order to achieve the above object, the present invention is a diesel engine in which a nozzle is provided in a cavity recessed in a top surface of a piston and a multi-nozzle nozzle is tilted. , A vertical surface portion along the axial direction of the piston, and a semi-circular curved surface portion that is continuous with both ends of the vertical surface portion.The multi-hole nozzle disperses fuel spray only on the curved surface portion. It has a large number of injection holes that are ejected by being made to be provided at the center of the radius of the curved surface part, and the radius of curvature of the curved surface part makes the flight distance of the fuel spray ejected from each injection hole equal to each other. It is set to the radius.
【０００７】[0007]
上述の如く構成すると、噴孔と湾曲面部分までの燃料噴霧の飛翔距離、噴霧速 度が各噴孔において同一となり、噴霧角がほぼ同一となる。このため、燃焼室に 対する燃料噴霧の分散・分布は均一になり、スモーク、燃費は、従来の２弁式デ ィーゼル機関と比較して大巾に改善される。 With the above configuration, the flight distance of the fuel spray to the injection hole and the curved surface portion and the spray speed are the same in each injection hole, and the spray angle is almost the same. Therefore, the distribution and distribution of the fuel spray to the combustion chamber becomes uniform, and the smoke and fuel consumption are greatly improved compared to the conventional two-valve diesel engine.
【０００８】[0008]
以下に本考案の好適一実施例を添付図面に基づいて説明する。 A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
【０００９】 図１は本考案に係る直接噴射式ディーゼル機関の燃焼室の平面を、図２は図１ のＩＩ−ＩＩ線断面を示している。FIG. 1 is a plan view of a combustion chamber of a direct injection diesel engine according to the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG.
【００１０】 図１において、１はシリンダヘッド（図示せず）に形成された大口径の吸気ポ ート、２はシリンダヘッドに形成された大口径の排気ポートを示している。燃焼 室３は、ピストン４のピストン頂面５を軸方向下方へ窪ませて形成したキャビテ ィ６によって区画形成されている。キャビティ６は、その周側壁部分が、ピスト ン４の軸芯方向に沿った垂直面部分７と、その垂直面部分７の両端と連続する半 円状の湾曲面部分８とから成り、多噴孔ノズル９は、その噴孔部１０を、湾曲面 部分８の半径の中心Ｏに位置させてシリンダヘッドに傾けて取り付けられている 。ところで多噴孔ノズルは、キャビティ６に対する燃料噴霧の分散・分布を均一 なものとするという目的から、ホール型ノズルのノズルチップ（噴孔部）に、円 周方向に間隔を有して噴孔を多数形成した形式のもののように、通常、燃焼室３ 内において多数の噴孔から同時に異なる方向へ燃料噴霧を噴出させる構造の燃料 噴射ノズルが用いられているが、本考案に於ける、多噴孔ノズル９は、通常の多 噴孔ノズルに対して次の点で構成が異なっている。すなわち本考案の多噴孔ノズ ル９は、その噴孔部１０に多数設けられる噴孔１１が、従来のように全周に亘っ て多数形成されているのではなく、垂直面部分７と湾曲面部分８との接点部を含 む湾曲面部分８へのみ燃料噴霧を噴出させるために、噴孔部１０の湾曲面部分８ 側の半周部分にのみ間隔をおいて噴孔１１が形成されている（なお、噴孔部１０ に対する噴孔１１の位置は、燃焼室３内を攪拌するスワール等の空気流動を考慮 して定められる）。そしてこの多噴孔ノズル９に対して、上記湾曲面部分８の曲 率半径Ｒは、各噴孔１１から噴出された燃料噴霧Ｆの飛翔距離Ｌを互いに等しく する半径に設定されている。また本考案では、キャビティ６内の空気を有効に活 用して燃焼室３全体に、均一な濃度の混合気を生成するために、図１に示す如く 、湾曲面部分８との接点部へ噴孔１１を向けて燃料噴霧Ｆを噴出するようにして いる。このような場合は、キャビティ６の他の部分へ燃料噴霧Ｆを噴射する場合 とは異なって、特に燃料噴霧Ｆそれ自体の拡散性を考慮し、ＨＣ発生防止のため 燃料噴霧Ｆが垂直面部分７に液膜として過度に付着されないようにしておく必要 がある。このため本考案では垂直面部分７に燃料噴霧Ｆ自身の拡散に対応した深 さの凹部１２を末広がり状に形成している。In FIG. 1, 1 is a large-diameter intake port formed in a cylinder head (not shown), and 2 is a large-diameter exhaust port formed in the cylinder head. The combustion chamber 3 is defined by a cavity 6 which is formed by recessing the piston top surface 5 of the piston 4 downward in the axial direction. The cavity 6 has a peripheral side wall portion composed of a vertical surface portion 7 along the axial direction of the piston 4 and a semi-circular curved surface portion 8 continuous with both ends of the vertical surface portion 7 to allow multiple injection. The hole nozzle 9 is attached so that the injection hole portion 10 is located at the center O of the radius of the curved surface portion 8 and is tilted to the cylinder head. By the way, the multi-injection nozzle has a nozzle tip (injection hole portion) of the hole-type nozzle with an interval in the circumferential direction for the purpose of making the distribution and distribution of the fuel spray in the cavity 6 uniform. Generally, a fuel injection nozzle having a structure for ejecting fuel spray from a plurality of injection holes in different directions in the combustion chamber 3 is used as in the case of the multi-injection type. The nozzle hole nozzle 9 differs from a normal multiple nozzle hole nozzle in the following points. That is, in the multi-nozzle nozzle 9 of the present invention, a large number of injection holes 11 provided in the injection hole portion 10 are not formed over the entire circumference as in the conventional case, but are curved with the vertical surface portion 7. In order to eject the fuel spray only to the curved surface portion 8 including the contact portion with the surface portion 8, the injection holes 11 are formed at intervals only in the half circumferential portion of the injection hole portion 10 on the curved surface portion 8 side. (Note that the position of the injection hole 11 with respect to the injection hole portion 10 1 is determined in consideration of the air flow such as swirl that stirs the inside of the combustion chamber 3). The radius of curvature R of the curved surface portion 8 of the multi-injection nozzle 9 is set so as to equalize the flight distances L of the fuel sprays F ejected from the respective injection holes 11. Further, in the present invention, in order to effectively utilize the air in the cavity 6 to generate a mixture of uniform concentration in the entire combustion chamber 3, as shown in FIG. The fuel spray F is ejected toward the injection hole 11. In such a case, unlike the case of injecting the fuel spray F to the other part of the cavity 6, especially in consideration of the diffusibility of the fuel spray F itself, in order to prevent HC generation, the fuel spray F has a vertical surface part. It is necessary to prevent it from being excessively attached as a liquid film on 7. Therefore, in the present invention, the concave portion 12 having a depth corresponding to the diffusion of the fuel spray F itself is formed in the vertical surface portion 7 in a divergent shape.
【００１１】 従って噴孔１１と湾曲面部分８までの燃料噴霧Ｆの飛翔距離Ｌ、噴霧速度が各 噴孔１１において同一に、また噴霧角がほぼ各噴孔１１において同一となるため 、燃焼室３に対する燃料噴霧Ｆの分散・分布は均一なものとなり、スモーク、燃 費は従来の２弁式ディーゼル機関と比較して大巾に改善される。Therefore, the flight distance L and the spray velocity of the fuel spray F to the injection hole 11 and the curved surface portion 8 are the same in each injection hole 11, and the spray angle is almost the same in each injection hole 11, so that the combustion chamber The distribution and distribution of the fuel spray F with respect to No. 3 are uniform, and the smoke and fuel consumption are greatly improved compared to the conventional two-valve diesel engine.
【００１２】 図１中、一点鎖線で示すキャビティ６ａは、多噴孔ノズル９に対して垂直面部 分７を半径方向外方へ適宜後退させて、パイロット噴射用の燃焼空間を形成した 例を示し、図１中、二点鎖線で示すキャビティ６ｂは、そのパイロット噴射用の 燃焼空間を扇状とした例を示している。In FIG. 1, a cavity 6 a shown by a one-dot chain line shows an example in which the vertical surface portion 7 is appropriately retracted outward in the radial direction with respect to the multiple injection hole nozzle 9 to form a combustion space for pilot injection. In FIG. 1, the cavity 6b indicated by the chain double-dashed line shows an example in which the combustion space for pilot injection has a fan shape.
【００１３】[0013]
以上説明したことから明らかなように本考案によれば次の如き優れた効果を発 揮する。 As is clear from the above description, the present invention produces the following excellent effects.
【００１４】 燃料噴霧の飛翔距離、噴霧速度、噴霧角が各噴口において同一となり、燃焼室 に対する燃料噴霧の分散・分布が均一となる。したがってスモーク、燃費を、従 来の２弁式ディーゼル機関と比較して大巾に改善できる。The flight distance of the fuel spray, the spray velocity, and the spray angle are the same at each injection port, and the dispersion and distribution of the fuel spray in the combustion chamber are uniform. Therefore, the smoke and fuel consumption can be greatly improved compared with the conventional two-valve diesel engine.
【図１】本考案に係る２弁式デイーゼル機関の平面図で
ある。FIG. 1 is a plan view of a two-valve diesel engine according to the present invention.
【図２】図１のＩＩ−ＩＩ線図である。FIG. 2 is a II-II diagram of FIG. 1.
４ ピストン ５ ピストン頂面 ６ キャビティ ７ 垂直面部分 ８ 湾曲面部分 ９ 多噴孔ノズル １１ 噴孔 Ｆ 燃料噴霧 Ｏ 湾曲面部分の中心 Ｒ 曲率半径 4 Piston 5 Piston top surface 6 Cavity 7 Vertical surface part 8 Curved surface part 9 Multiple injection nozzle 11 Injection hole F Fuel spray O Center of curved surface part R Radius of curvature
Claims (1)
に噴口部を臨ませて多噴孔ノズルを傾けて設けたディー
ゼル機関において、上記キャビティの周側壁部分が、ピ
ストンの軸芯方向に沿った垂直面部分と、その垂直面部
分の両端と連続する半円状の湾曲面部分とから成り、上
記多噴孔ノズルは上記湾曲面部分のみに燃料噴霧を分散
させて噴出する噴孔を多数有して上記湾曲面部分の半径
の中心位置に設けられ、上記湾曲面部分の曲率半径が、
各噴孔から噴出された燃料噴霧の飛翔距離を互いに等し
くする半径に設定されていることを特徴とする２弁式デ
ィーゼル機関。1. In a diesel engine in which a multi-hole nozzle is tilted with a nozzle opening facing a cavity formed in a top surface of a piston, a peripheral side wall portion of the cavity extends along the axial direction of the piston. A vertical surface portion and a semi-circular curved surface portion that is continuous with both ends of the vertical surface portion.The multi-hole nozzle has a large number of injection holes for dispersing fuel spray only on the curved surface portion. It is provided at the center of the radius of the curved surface portion, and the radius of curvature of the curved surface portion is
A two-valve diesel engine characterized in that radii are set so that flight distances of fuel sprays ejected from the respective injection holes are equal to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7916891U JP2562600Y2 (en) | 1991-09-30 | 1991-09-30 | Two-valve diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7916891U JP2562600Y2 (en) | 1991-09-30 | 1991-09-30 | Two-valve diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0530426U true JPH0530426U (en) | 1993-04-23 |
| JP2562600Y2 JP2562600Y2 (en) | 1998-02-10 |
Family
ID=13682445
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7916891U Expired - Lifetime JP2562600Y2 (en) | 1991-09-30 | 1991-09-30 | Two-valve diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2562600Y2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016148244A (en) * | 2015-02-10 | 2016-08-18 | 株式会社デンソー | Internal combustion engine |
-
1991
- 1991-09-30 JP JP7916891U patent/JP2562600Y2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016148244A (en) * | 2015-02-10 | 2016-08-18 | 株式会社デンソー | Internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2562600Y2 (en) | 1998-02-10 |
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