JPS5849689B2 - direct injection diesel engine - Google Patents
direct injection diesel engineInfo
- Publication number
- JPS5849689B2 JPS5849689B2 JP4946777A JP4946777A JPS5849689B2 JP S5849689 B2 JPS5849689 B2 JP S5849689B2 JP 4946777 A JP4946777 A JP 4946777A JP 4946777 A JP4946777 A JP 4946777A JP S5849689 B2 JPS5849689 B2 JP S5849689B2
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- circumferential surface
- diesel engine
- fuel
- inner circumferential
- 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
- 238000002347 injection Methods 0.000 title claims description 9
- 239000007924 injection Substances 0.000 title claims description 9
- 239000000446 fuel Substances 0.000 claims description 13
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 description 6
- 230000002349 favourable effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 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
- F02B2275/00—Other engines, components or details, not provided for in other groups of this subclass
- F02B2275/14—Direct injection into combustion chamber
Landscapes
- Combustion Methods Of Internal-Combustion Engines (AREA)
Description
【発明の詳細な説明】
ディーゼル機関においては噴射された燃料の霧化および
気化（以下、混合気の生成と呼ぶ。DETAILED DESCRIPTION OF THE INVENTION In a diesel engine, the injected fuel is atomized and vaporized (hereinafter referred to as mixture generation).
）が機関の性能に大きな関係をもつ。) has a large relationship with engine performance.
小型の高速ディーゼル機関については大型機関の場合の
ようにノズルの噴口数を多くできない事情があるので吸
気に与えられるスワールに依存しつつ混合気の生成を良
くすることが考慮されている。For small high-speed diesel engines, there are circumstances in which it is not possible to increase the number of nozzles as in the case of large engines, so consideration has been given to improving the generation of air-fuel mixture while relying on the swirl given to the intake air.
本発明は上記のスワールが混合気の生或につき好ましい
状態の下に作用するようにすることを目的とするもので
、以下図に関連して説明する如く、ヒストンの頂部に設
けられるキャビテイの中央部に設けられる突起の形状を
改善するものである。The object of the present invention is to enable the above-mentioned swirl to operate under favorable conditions for the production of air-fuel mixture. This is to improve the shape of the protrusion provided on the part.
図において、１はピストン、３はピストン１の頂部に設
けられたキャビテイ、５はこのキャビテイの中央部に設
けられた突起である。In the figure, 1 is a piston, 3 is a cavity provided at the top of the piston 1, and 5 is a protrusion provided at the center of this cavity.
突起５の局面には噴射ノズル２の噴口数に等しい数の凹
面６が設けられる。A number of concave surfaces 6 equal to the number of injection ports of the injection nozzle 2 is provided on the curved surface of the projection 5 .
相隣る凹面間の部分８はキャビテイ３の内周面４に近接
させられ、スワールＳの流れを絞る絞り部９がこの部分
８とキャビテイ３の内周面４との間に形成されている。A portion 8 between adjacent concave surfaces is brought close to the inner circumferential surface 4 of the cavity 3, and a constriction portion 9 for restricting the flow of the swirl S is formed between this portion 8 and the inner circumferential surface 4 of the cavity 3. .
噴射ノズル２よりの燃料の噴射は絞り部９に向って行わ
れる。Fuel is injected from the injection nozzle 2 toward the constriction section 9.
７ａ−７ｄは噴射ノズル２より噴射される燃料の流れ７
（第２図参照）が当る部位を示す。7a-7d are fuel flows 7 injected from the injection nozzle 2;
(See Figure 2) shows the affected area.
絞り部９と凹面６とはそれらが共働してミクロの渦流Ｍ
を多量に発生する。The constriction part 9 and the concave surface 6 work together to create a micro vortex M.
occurs in large quantities.
渦流Ｍの発生は絞り部９に近い部位０持に四面６に近い
部位）において多い。The vortex M is generated more frequently in the area near the constriction part 9 and in the area near the four faces 6).
この部位は、噴射された燃料の粒子が比較的大きく、且
つ、燃料の分布密度の高い部位で、多量に発生される渦
流Ｍは燃料の気化の促進に大きく寄与する。This region is a region where the particles of the injected fuel are relatively large and the distribution density of the fuel is high, and the large amount of vortex flow M generated greatly contributes to promoting vaporization of the fuel.
なお、第２図のクロス斜線は４個の噴口より噴躬された
燃料の燃焼展開を示す。Note that the cross diagonal lines in FIG. 2 indicate the combustion development of the fuel injected from the four nozzles.
キャビテイを頂部にもつピストンの使用の背景には吸気
の充填効率とスワール強度との関係がある。The reason behind the use of a piston with a cavity at the top is the relationship between intake air filling efficiency and swirl strength.
充填効率を高くしようとすれは良好な混合気を生成する
のに有効なスワール強度を低くすることを余儀なくされ
るので、充填効率を比較的高く保ちしかも良好な混合気
を生或するには強度を幾分犠性にされたスワールの利用
度を高める手段が必要となり、それがピストンの頂部へ
のキャビテイの設置となって現われているのである。In order to increase the filling efficiency, it is necessary to lower the swirl strength that is effective for producing a good mixture. Therefore, in order to keep the filling efficiency relatively high and produce a good mixture, A means was needed to increase the utilization of the swirl, which was sacrificed to some extent, and this appeared in the installation of a cavity at the top of the piston.
以上において説明した本発明によるものは上記キャビテ
イの作用、すなわち、スワールによって良好な混合気を
生成させるキャビテイの性能を一段と改善するものであ
る。The present invention described above further improves the function of the cavity, that is, the ability of the cavity to generate a good air-fuel mixture by swirling.
第１図は本発明によるピストンの一例を示す平面図、第
２図は第１図のピストンの作用説明図である。
１・・・・・・ピストン、２・・・・・・噴射ノズル、
３・・・・・・キャビテイ、４・・・・・・キャビテイ
の内周面、５・・・・・・突起、６・・・・・・凹面、
７・・・・・・噴射された燃料の流れ、７ａ−７ｄ・・
・・・・噴射された燃料が当るキャビテイ上の部位、８
・・・・・・相隣る凹面間の部分、９・・・・・・絞り
部、Ｍ・・・・・・渦流、Ｓ・・・・・・スワール。FIG. 1 is a plan view showing an example of a piston according to the present invention, and FIG. 2 is an explanatory view of the operation of the piston shown in FIG. 1. 1...Piston, 2...Injection nozzle,
3...Cavity, 4...Inner peripheral surface of cavity, 5...Protrusion, 6...Concave surface,
7...Flow of injected fuel, 7a-7d...
... Part on the cavity that is hit by the injected fuel, 8
・・・・・・Portion between adjacent concave surfaces, 9: Squeezed portion, M: vortex, S: Swirl.
Claims (1)
に設けられ、キャビテイ内に生じるスワールがキャビテ
イの内周面とキャビテイの中央部に設けられた突起の外
周面とにより案内される形式のものにおいて、噴射ノズ
ルの噴口数に等しい数の凹面を上記突起の周面上に設け
ると共にこれらの凹面間の部分をキャビテイの内周面に
近接させてこの部分とキャビテイの内周面との間にキャ
ビテイ内のスワールの流れを絞る絞り部を形成し、噴射
ノズルによる燃料の噴射方向をこの絞り部に向う方向に
選定したことを特徴とする直噴式ディーゼル機関。1 In a type in which a cavity that acts as a combustion chamber is provided at the top of the piston, and the swirl generated within the cavity is guided by the inner circumferential surface of the cavity and the outer circumferential surface of a protrusion provided in the center of the cavity, the injection A number of concave surfaces equal to the number of orifices of the nozzle are provided on the circumferential surface of the protrusion, and the portion between these concave surfaces is brought close to the inner circumferential surface of the cavity, so that a portion of the inside of the cavity is formed between this portion and the inner circumferential surface of the cavity. A direct-injection diesel engine characterized by forming a constriction part that restricts the swirl flow, and selecting a direction in which fuel is injected by an injection nozzle toward the constriction part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4946777A JPS5849689B2 (en) | 1977-04-28 | 1977-04-28 | direct injection diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4946777A JPS5849689B2 (en) | 1977-04-28 | 1977-04-28 | direct injection diesel engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS53134105A JPS53134105A (en) | 1978-11-22 |
| JPS5849689B2 true JPS5849689B2 (en) | 1983-11-05 |
Family
ID=12831933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4946777A Expired JPS5849689B2 (en) | 1977-04-28 | 1977-04-28 | direct injection diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5849689B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5617320U (en) * | 1979-07-19 | 1981-02-16 | ||
| JPH0458015A (en) * | 1990-06-28 | 1992-02-25 | Shinnenshiyou Syst Kenkyusho:Kk | Combustion chamber of direct injection type diesel engine |
| JP2653556B2 (en) * | 1990-12-27 | 1997-09-17 | 株式会社新燃焼システム研究所 | Combustion chamber of direct injection diesel engine |
-
1977
- 1977-04-28 JP JP4946777A patent/JPS5849689B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS53134105A (en) | 1978-11-22 |
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