JPS60125721A - Combustion chamber of direct-injection type diesel engine - Google Patents
Combustion chamber of direct-injection type diesel engineInfo
- Publication number
- JPS60125721A JPS60125721A JP58232700A JP23270083A JPS60125721A JP S60125721 A JPS60125721 A JP S60125721A JP 58232700 A JP58232700 A JP 58232700A JP 23270083 A JP23270083 A JP 23270083A JP S60125721 A JPS60125721 A JP S60125721A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- elliptical
- long
- diesel engine
- shape
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 29
- 238000002347 injection Methods 0.000 title claims abstract description 28
- 239000007924 injection Substances 0.000 title claims abstract description 28
- 239000000446 fuel Substances 0.000 claims abstract description 14
- 239000007921 spray Substances 0.000 abstract description 6
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 5
- 239000000779 smoke Substances 0.000 description 5
- 241000123589 Dipsacus Species 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000000149 penetrating effect 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0696—W-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder wall
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0672—Omega-piston bowl, i.e. the combustion space having a central projection pointing towards the cylinder head and the surrounding wall being inclined towards the cylinder center axis
-
- 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
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0618—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion
- F02B23/0621—Squish flow
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0618—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion
- F02B23/0624—Swirl flow
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0618—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion
- F02B23/0627—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston having in-cylinder means to influence the charge motion having additional bores or grooves machined into the piston for guiding air or charge flow to the piston bowl
-
- 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
- F02B23/00—Other engines characterised by special shape or construction of combustion chambers to improve operation
- F02B23/02—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition
- F02B23/06—Other engines characterised by special shape or construction of combustion chambers to improve operation with compression ignition the combustion space being arranged in working piston
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0669—Details related to the fuel injector or the fuel spray having multiple fuel spray jets per injector nozzle
-
- 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
- F02B3/00—Engines characterised by air compression and subsequent fuel addition
- F02B3/06—Engines characterised by air compression and subsequent fuel addition with compression ignition
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は主として小型の直接噴射式ディーゼル機関の燃
焼室に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates primarily to the combustion chamber of a small direct injection diesel engine.
直接噴ｑ・１式（以下の説明では直噴式と略称する）の
テイーゼル機関の燃焼室の形状は、従来第１図の側断面
図及び第２図の平面図に示すように、円形または角形の
凹状の燃焼室１がピストン２の上面に形成されており、
第１図に示すように噴１−１数２個の燃料噴射弁６をイ
ノする小形直噴式ディーゼル機関の場合には、燃料噴射
弁６の噴口から噴射される燃料噴霧の到達距離りが短か
く、特に機関の始動性能が悪く、始動時に青白煙の発生
が多いという欠点がある。Conventionally, the shape of the combustion chamber of a direct injection Q-1 type (abbreviated as direct injection type in the following explanation) Teasel engine is circular or square, as shown in the side sectional view in Figure 1 and the plan view in Figure 2. A concave combustion chamber 1 is formed on the upper surface of the piston 2,
As shown in Fig. 1, in the case of a small direct injection diesel engine that injects two fuel injection valves 6, the travel distance of the fuel spray injected from the nozzle of the fuel injection valve 6 is short. As a result, the starting performance of the engine is particularly poor, and blue-white smoke is often generated when starting.
そこで本発明は、前記従来の欠点をｆＩＦ消し、特に噴
口数２個の直噴式ディーゼル機関の始動性能の向上をは
かり、始動時の青白煙の発生の低減をはかることを目的
としてなされたものである。SUMMARY OF THE INVENTION Therefore, the present invention has been made with the aim of eliminating the above-mentioned drawbacks of the conventional fIF, particularly improving the starting performance of a direct injection diesel engine with two nozzles, and reducing the generation of blue-white smoke at the time of starting. be.
即ち本発明は、噴口数２個の燃料噴射弁を設けた直噴式
ディーゼル機関の燃焼室を、各噴口の噴射方向に長い長
円形またはまゆ形に形成することにより構成される。That is, the present invention is constructed by forming the combustion chamber of a direct injection diesel engine provided with a fuel injection valve with two injection ports into an oval or cocoon shape that is elongated in the injection direction of each injection port.
以下図面を参照して本発明の詳細な説明するが、第３図
及び第４図は本発明のそれぞれ異なる実施例の燃焼室の
平面図であり、第２図の従来例の燃焼室１とほぼ同様な
構成及び機能を有するものである。The present invention will be described in detail below with reference to the drawings. FIGS. 3 and 4 are plan views of combustion chambers of different embodiments of the present invention, and the combustion chamber 1 of the conventional example shown in FIG. They have almost the same configuration and functions.
そこで、第３図の実１ｍ例１は、噴口数２個の燃料噴射
弁６の各噴口の噴射方向に長い長円形の燃焼室１をピス
トン２の上面に形成したものであり、スワールＳの方向
を考慮して各噴口の噴射方向を長円形の中心線から角度
θだけ手前に向けたものであり、長円形としては半径γ
、の半円を直線で結び、長半径Ｌ１、短半径Ｌ２に形成
したものである。Therefore, the 1 m actual example 1 shown in Fig. 3 has an oval combustion chamber 1 formed on the top surface of the piston 2, which is long in the injection direction of each nozzle of a fuel injector 6 having two nozzles, and has a swirl S. Considering the direction, the injection direction of each nozzle is directed forward by an angle θ from the center line of the ellipse, and the radius of the ellipse is γ
, are formed by connecting the semicircles of , with a straight line to have a major axis L1 and a minor radius L2.
なお、上記噴射方向の角度θはスワールＳの流れ方向な
どを考慮して０から６０°の範囲で決めるものとする。Note that the angle θ of the injection direction is determined in the range of 0 to 60° in consideration of the flow direction of the swirl S and the like.
また、第４図の実施例２は半径ｒ１の半円を半径ｒ２の
曲線等で結んだまゆ形の燃焼室１を燃焼室１をピストン
２の」二面に形成したものであり、半径ｒ、＜γ、とし
、噴射方向は実姉例１とほぼ同様にしている。Embodiment 2 shown in FIG. 4 has a cocoon-shaped combustion chamber 1 formed by connecting a semicircle with radius r1 with a curved line with radius r2, and the combustion chamber 1 is formed on two sides of the piston 2. , <γ, and the injection direction is almost the same as that of the actual sister example 1.
］二記のごとく燃焼室１を長円形またはまゆ形に形成す
ることにより、凹状の燃焼室１の形状が、Ｌ、）Ｌ２
になっていることから、燃焼室１内に乱流が発生し、燃
料噴霧と吸入空気との混合が一促進されると共に、燃料
噴霧の到達距離が長くなるので始動性能が改善され、低
力時の青白煙発生が低減する。] By forming the combustion chamber 1 into an oval or cocoon shape as described in 2, the shape of the concave combustion chamber 1 becomes L, )L2
As a result, turbulent flow is generated in the combustion chamber 1, which promotes the mixing of the fuel spray and intake air.The range of the fuel spray is also increased, which improves starting performance and reduces power consumption. The generation of blue-white smoke is reduced.
なお、第５図の平面図及び第６図の側断面図に示す実施
例３の直噴式ディーゼル機関の凹状の燃焼室１は長円形
に形成されたものであるが、ピストン２の頂面の開口部
が絞った形状になっており、横形機関においては機関始
動時に拡張された底部に燃料噴歿が多量にたまり、始動
時の青白煙発生の原因になるが、この実姉例３では燃焼
室１の最大径部からピストン２の頂面に半径ａ ＝ ０
．０５〜０．２５ ％ Ｘピストン直径の連絡穴４をピ
ストン下面に設け、始動時に未燃燃料を燃焼室１の外に
導き始動性能の改善をはがっている。The concave combustion chamber 1 of the direct injection diesel engine of the third embodiment shown in the plan view of FIG. 5 and the side sectional view of FIG. The opening has a narrowed shape, and in horizontal engines, a large amount of fuel injected accumulates at the expanded bottom when the engine starts, causing blue-white smoke when starting, but in this example 3, the combustion chamber Radius a = 0 from the maximum diameter of piston 1 to the top surface of piston 2
．． A communication hole 4 with a piston diameter of 0.05 to 0.25% is provided on the lower surface of the piston to guide unburned fuel out of the combustion chamber 1 at the time of starting, thereby improving starting performance.
一方、この連絡穴４は第６図のピストン２のトップラン
ド５付近の外周側に貫通して設けても良く、その場合に
はピストンリングの気密性も向上するという効果がある
。On the other hand, this communication hole 4 may be provided penetrating the outer circumferential side of the piston 2 near the top land 5 shown in FIG. 6, and in this case, there is an effect that the airtightness of the piston ring is also improved.
なお、この連絡穴４の方向及び貫通部の位置は特に限定
されるものでなく、その方向及び位置によって始動性能
の向上の他多くの効果が得られる。Note that the direction of the communication hole 4 and the position of the through-hole are not particularly limited, and many effects other than improvement of starting performance can be obtained depending on the direction and position.
従って、本発明の燃焼室を適用した直噴式ディーゼル機
関では、噴口からの噴霧到達距離が長くなり、始動性能
の改善と、低力時の青白煙発生を防止する」二で有効で
あり、しかも燃焼室内の乱流発生による燃焼性能の向上
をはかりうるという効果がある。Therefore, in a direct injection diesel engine to which the combustion chamber of the present invention is applied, the spray reaches a longer distance from the nozzle, which is effective in improving starting performance and preventing the generation of blue-white smoke at low power. This has the effect of improving combustion performance by generating turbulence within the combustion chamber.
第１図は従来の直噴式テイーゼル機関の燃焼室の側面図
、第２図は第１図の平面図、第３図及び第４図は本発明
のそれぞれ異なる実施例の燃焼室の’Ｆ而面で、第３図
はその実施例１を示し、第４図はその実施例２を示し、
第５図は本発明の実施例３の燃焼室の平面図、第６図は
第５図の側断面図である。
１・燃焼室 ２・ピストン ６・・・燃利噴１寸弁。
代理人 弁理士 小 川 信 −
弁理士 野 １コ 腎 照
弁理士 斎 下 和 彦FIG. 1 is a side view of a combustion chamber of a conventional direct injection tasel engine, FIG. 2 is a plan view of FIG. 1, and FIGS. 3 and 4 are views of combustion chambers of different embodiments of the present invention. 3 shows the first embodiment, FIG. 4 shows the second embodiment,
FIG. 5 is a plan view of a combustion chamber according to a third embodiment of the present invention, and FIG. 6 is a side sectional view of FIG. 5. 1. Combustion chamber 2. Piston 6... Fuel injection 1 inch valve. Agent: Patent Attorney Nobuo Ogawa - Patent Attorney No. 1 Ko Ren Teru Patent Attorney Kazuhiko Saishita
Claims (1)
機関の燃焼室において、その燃焼室を６噴ＩＩＩの噴射
方向に長い長円形またはまゆ形に形成したことを特徴と
する直接噴射式ディーゼル機関の燃焼室。A direct injection diesel engine equipped with a fuel injection valve with two nozzles, characterized in that the combustion chamber is formed into an oval or cocoon shape that is elongated in the injection direction of six injections III. combustion chamber of the engine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58232700A JPS60125721A (en) | 1983-12-12 | 1983-12-12 | Combustion chamber of direct-injection type diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58232700A JPS60125721A (en) | 1983-12-12 | 1983-12-12 | Combustion chamber of direct-injection type diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60125721A true JPS60125721A (en) | 1985-07-05 |
Family
ID=16943399
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58232700A Pending JPS60125721A (en) | 1983-12-12 | 1983-12-12 | Combustion chamber of direct-injection type diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60125721A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6272435U (en) * | 1985-10-28 | 1987-05-09 | ||
| FR2739896A1 (en) * | 1995-10-11 | 1997-04-18 | Inst Francais Du Petrole | Combustion chamber for IC engine with shaped piston head |
-
1983
- 1983-12-12 JP JP58232700A patent/JPS60125721A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6272435U (en) * | 1985-10-28 | 1987-05-09 | ||
| FR2739896A1 (en) * | 1995-10-11 | 1997-04-18 | Inst Francais Du Petrole | Combustion chamber for IC engine with shaped piston head |
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