JPH0941975A - Combustion chamber of direct injection type diesel engine - Google Patents
Combustion chamber of direct injection type diesel engineInfo
- Publication number
- JPH0941975A JPH0941975A JP7189461A JP18946195A JPH0941975A JP H0941975 A JPH0941975 A JP H0941975A JP 7189461 A JP7189461 A JP 7189461A JP 18946195 A JP18946195 A JP 18946195A JP H0941975 A JPH0941975 A JP H0941975A
- Authority
- JP
- Japan
- Prior art keywords
- combustion chamber
- diesel engine
- side wall
- fuel
- direct injection
- 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
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
- F02B23/0645—Details related to the fuel injector or the fuel spray
- F02B23/0648—Means or methods to improve the spray dispersion, evaporation or ignition
- F02B23/0651—Means or methods to improve the spray dispersion, evaporation or ignition the fuel spray impinging on reflecting surfaces or being specially guided throughout the combustion space
-
- 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
- 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
-
- 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
-
- 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)
- Dispersion Chemistry (AREA)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、直噴式ディーゼル
エンジンの燃焼室に関する。TECHNICAL FIELD The present invention relates to a combustion chamber of a direct injection type diesel engine.
【０００２】[0002]
【従来の技術】図４に従来の直噴式ディーゼルエンジン
の燃焼室１を示す。図示するようにこの燃焼室１（リエ
ントラント型）は、ピストン頂面２に開口された開口部
３より拡径された側壁４を有し、燃料噴射ノズル５から
噴射された燃料をこの側壁４に沿って底壁６に導くもの
である。ノズル５から噴射された噴霧（燃料）は、図中
縞模様で示すように時間と共にその到達距離が伸び、そ
の途中の領域７および８において空気導入が行われる。
しかし、側壁４および底壁６側の領域９においては、燃
料への空気導入が行われないため、スモークが発生して
しまう。2. Description of the Related Art FIG. 4 shows a combustion chamber 1 of a conventional direct injection diesel engine. As shown in the figure, this combustion chamber 1 (reentrant type) has a side wall 4 whose diameter is expanded from an opening 3 opened in the piston top surface 2, and the fuel injected from a fuel injection nozzle 5 is directed to this side wall 4. It guides to the bottom wall 6 along. The spray (fuel) injected from the nozzle 5 has a reaching distance that increases with time as shown by a striped pattern in the figure, and air is introduced in regions 7 and 8 in the middle thereof.
However, in the region 9 on the side wall 4 and bottom wall 6 side, smoke is generated because air is not introduced into the fuel.
【０００３】図５に別の直噴式ディーゼルエンジンの燃
焼室１０を示す（特開昭63-306220号公報等）。この燃
焼室１０は、開口部１１が二段形状となっていて、そこ
に向けて噴射された燃料を側壁１２から剥離させて底壁
１３に導くため、その剥離領域１４にて空気導入を図る
ことができる。しかし、底壁１３に導かれた燃料の一部
１５が側壁１２側に廻り込んでしまうため、剥離領域１
４における空気導入が阻害されてしまい、完璧とはいえ
ない。また、開口部１１にて二段形状を構成するとその
棚の厚さ１６が図４の棚の厚さ１７より薄くなるため、
高過給すると熱疲労によって亀裂が生じる虞がある。FIG. 5 shows another combustion chamber 10 of a direct injection diesel engine (Japanese Patent Laid-Open No. 63-306220, etc.). In the combustion chamber 10, the opening 11 has a two-step shape, and the fuel injected toward the combustion chamber 10 is separated from the side wall 12 and guided to the bottom wall 13, so that air is introduced in the separation region 14. be able to. However, since a part 15 of the fuel guided to the bottom wall 13 wraps around to the side wall 12 side, the peeled region 1
It is not perfect because the air introduction in 4 was obstructed. Further, when the opening 11 has a two-step shape, the thickness 16 of the shelf becomes thinner than the thickness 17 of the shelf in FIG.
High supercharging may cause cracks due to thermal fatigue.
【０００４】[0004]
【発明が解決しようとする課題】図６に別の直噴式ディ
ーゼルエンジンの燃焼室１８を示す（実開昭56-171625
号公報等）。この燃焼室１８は、開口部１９の直下の衝
突面２０に向けて噴射された燃料を、エッジ部分２１で
剥離させて霧化促進を図ったものである。しかし、実際
には、衝突面２０に噴射された燃料は、矢印２２で示す
ように側壁２３側に沿って流れてしまい、霧化促進が十
分図れない。これは、衝突面２０の長さが短く、燃料を
その延長線２４方向へ導く慣性力が小さいためと考えら
れる。FIG. 6 shows another combustion chamber 18 of a direct-injection diesel engine (actual exploitation 56-171625).
No.). In the combustion chamber 18, the fuel injected toward the collision surface 20 immediately below the opening 19 is separated at the edge portion 21 to promote atomization. However, in reality, the fuel injected to the collision surface 20 flows along the side wall 23 side as shown by the arrow 22, and the atomization cannot be sufficiently promoted. It is considered that this is because the length of the collision surface 20 is short and the inertial force that guides the fuel toward the extension line 24 is small.
【０００５】なお、衝突面２０の長さが短くとも、衝突
面２０を鉛直方向に近付けてその角度を立てればエッジ
部分２１で剥離しやすくなるが、この場合、衝突面２０
と底壁２５との角度θが大きくなるため、図６に示すよ
うに燃料の廻り込み２５ａが生じてしまう。Even if the length of the collision surface 20 is short, if the collision surface 20 is brought close to the vertical direction and its angle is increased, the edge portion 21 easily peels off.
Since the angle θ between the bottom wall 25 and the bottom wall 25 becomes large, the fuel wraparound 25a occurs as shown in FIG.
【０００６】図７に別の直噴式ディーゼルエンジンの燃
焼室２６を示す（実開昭56-171625号公報等）。この燃
焼室２６は、衝突面２７が鉛直であるため、これに向け
て噴射された燃料の一部が燃焼室２６の外側に溢れ、ス
モークが悪化してしまう。FIG. 7 shows another combustion chamber 26 of a direct injection diesel engine (Japanese Utility Model Laid-Open No. 56-171625, etc.). Since the collision surface 27 of the combustion chamber 26 is vertical, a part of the fuel injected toward the combustion chamber 26 overflows to the outside of the combustion chamber 26 and the smoke is deteriorated.
【０００７】図８に別の直噴式ディーゼルエンジンの燃
焼室２８を示す（特開昭59-79029号公報等）。この燃焼
室２８は、底壁２９に形成された段差部３０において噴
射燃料が剥離し、そこで空気導入が図られるものであ
る。しかし、上記段差部３０には側壁３１を伝った後の
運動エネルギが弱まった噴霧が供給されるため、剥離領
域３２での空気導入を十分行うことができない。FIG. 8 shows a combustion chamber 28 of another direct injection diesel engine (Japanese Patent Laid-Open No. 59-79029, etc.). In the combustion chamber 28, the injected fuel is separated at the step portion 30 formed on the bottom wall 29, and air is introduced there. However, since the spray having weakened kinetic energy after being transmitted through the side wall 31 is supplied to the step portion 30, it is not possible to sufficiently introduce air in the separation area 32.
【０００８】以上の事情を考慮して創案された本発明の
目的は、燃焼室の壁面に沿って流れる噴射燃料への空気
導入を積極的に向上できる直噴式ディーゼルエンジンの
燃焼室を提供することにある。An object of the present invention, which was devised in view of the above circumstances, is to provide a combustion chamber of a direct injection diesel engine capable of positively improving the introduction of air into the injected fuel flowing along the wall surface of the combustion chamber. It is in.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成すべく本
発明は、ピストン頂面に凹設されたキャビティの側壁に
噴射された燃料をその側壁に沿って底壁に導くようにし
た直噴式ディーゼルエンジンの燃焼室において、上記側
壁に、噴射燃料を所定距離助走させる助走部を設けると
共に、その助走部の終端に助走された燃料を側壁から剥
離させる側凹部を設けて構成されている。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is a direct injection type in which fuel injected into a side wall of a cavity recessed in a piston top surface is guided to a bottom wall along the side wall. In the combustion chamber of a diesel engine, the side wall is provided with an advancing portion for advancing the injected fuel by a predetermined distance, and a side recess for separating the advancing fuel from the side wall is provided at the end of the advancing portion.
【００１０】この構成によれば、側壁に沿って底壁に導
かれる噴射燃料は、助走部によって所定距離助走されあ
る程度の慣性がついた後、助走部の終端に設けられた側
凹部にて側壁から剥離するため、十分な運動エネルギを
もって剥離し、その剥離領域にて十分な空気導入がなさ
れる。According to this structure, the injected fuel guided along the side wall to the bottom wall is run for a predetermined distance by the run-up section and has a certain amount of inertia, and then the side-wall is formed in the side recessed portion provided at the end of the run-up section. Therefore, the air is peeled off with sufficient kinetic energy, and sufficient air is introduced in the peeled area.
【００１１】また、上記底壁に底凹部を設ければ、上記
側凹部で剥離した後に底壁に導かれた燃料が底凹部にて
底壁から剥離するため、再度空気導入がなされる。よっ
て、噴霧への空気導入が更に増加する。Further, when the bottom recess is provided in the bottom wall, the fuel introduced into the bottom wall after being separated at the side recess is separated from the bottom wall at the bottom recess, so that air is introduced again. Therefore, the introduction of air into the spray is further increased.
【００１２】また、上記底壁の中央に***部を形成して
その周囲をスワール通路とすれば、側壁から底壁に導か
れて運動エネルギが低下した噴霧燃料がスワールに流さ
れて運動エネルギを回復するので、底凹部における剥離
での空気導入が向上する。If a ridge is formed at the center of the bottom wall and a swirl passage is formed around the ridge, the atomized fuel, which has been reduced in kinetic energy by being guided from the side wall to the bottom wall, is caused to flow into the swirl to increase the kinetic energy. Since it recovers, the air introduction at the peeling in the bottom recess is improved.
【００１３】[0013]
【発明の実施の形態】本発明に係る直噴式ディーゼルエ
ンジンの燃焼室は次のようにして製造される。まず、ピ
ストンの頂面に、開口部より側壁が拡径されると共に、
底壁の中央に***部が形成されたリエントラント型の燃
焼室を凹設する。そして、そのキャビティの側壁に、深
さ方向に徐々に拡径された助走部を形成する。燃料噴射
ノズルの噴射口を、この助走部の始端に向けて形成す
る。上記助走部の終端に、径方向外方に急激に拡径され
た側凹部を繋げて形成する。このような形状の燃焼室
は、鋳造、鍛造、ダイキャストまたは加工等によって、
各構成要素が同時に一体的に形成される。BEST MODE FOR CARRYING OUT THE INVENTION The combustion chamber of a direct injection type diesel engine according to the present invention is manufactured as follows. First, on the top surface of the piston, the side wall is expanded from the opening,
A reentrant combustion chamber having a raised portion is formed in the center of the bottom wall. Then, on the side wall of the cavity, the run-up portion whose diameter is gradually increased in the depth direction is formed. The injection port of the fuel injection nozzle is formed toward the starting end of this approach portion. At the end of the run-up portion, a side concave portion that is rapidly expanded in the radial direction is connected and formed. The combustion chamber with such a shape can be cast, forged, die-cast or processed by
Each component is integrally formed at the same time.
【００１４】[0014]
【実施例】本発明を具体的に示した一実施例を図１およ
び図２に示す。図２は直噴式ディーゼルエンジンの燃焼
室が形成されたピストンの側断面図であり、図１はその
要部拡大図である。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS. FIG. 2 is a side sectional view of a piston in which a combustion chamber of a direct injection diesel engine is formed, and FIG. 1 is an enlarged view of a main part thereof.
【００１５】図示するように、直噴式ディーゼルエンジ
ンのピストン５０の頂面５１には、開口部５２の直径が
側壁５３の最大内径よりも絞られ、且つ底壁５４の中央
に***部５５を形成してなる所謂リエントラント型の燃
焼室５６が凹設されている。As shown in the figure, on the top surface 51 of the piston 50 of the direct injection type diesel engine, the diameter of the opening 52 is narrower than the maximum inner diameter of the side wall 53, and the raised portion 55 is formed at the center of the bottom wall 54. A so-called re-entrant type combustion chamber 56 is formed as a recess.
【００１６】側壁５３は、円形の開口部５２から所定深
さ鉛直に形成された鉛直部５７と、鉛直部５７に繋げて
深さ方向に徐々に拡径して形成された助走部５８と、助
走部５８に繋げて径方向外方へ急激に拡径して形成され
た側凹部５９とから構成されている。他方、底壁５４
は、側凹部５９に繋げて形成された案内部６０と、案内
部６０に繋げて形成された底凹部６１と、底凹部６１に
繋げて形成された***部５５とから構成されている。The side wall 53 has a vertical portion 57 which is vertically formed to a predetermined depth from the circular opening 52, and a run-up portion 58 which is connected to the vertical portion 57 and is formed so as to be gradually expanded in the depth direction. It is composed of a side recessed portion 59 which is connected to the run-up portion 58 and is formed so as to have a diameter that is suddenly increased radially outward. On the other hand, the bottom wall 54
Is composed of a guide portion 60 connected to the side recess 59, a bottom recess 61 connected to the guide 60, and a raised portion 55 connected to the bottom recess 61.
【００１７】助走部５８は、その前半側５８ａが凸状に
形成されており、後半側５８ｂが凹状に形成されてい
る。助走部５８の後半側５８ｂは、その延長線６３が案
内部６０に滑らかに接する形状に形成されている。助走
部５８と側凹部５９とは、段差部６４を介して接続さ
れ、案内部６０と底凹部６１とは、段差部６５を介して
接続されている。The run-up portion 58 has a front half 58a formed in a convex shape and a rear half 58b formed in a concave shape. An extension line 63 of the trailing side 58b of the run-up portion 58 is formed so as to smoothly contact the guide portion 60. The run-up portion 58 and the side recessed portion 59 are connected via a step portion 64, and the guide portion 60 and the bottom recessed portion 61 are connected via a step portion 65.
【００１８】***部５５は、円柱状に形成されており、
円形の開口部５２の中心に配置されている。また、助走
部５８には、鉛直部５７との接続部近傍に向けて、燃料
噴射ノズル６６から燃料が噴射されるようになってい
る。また、この燃焼室５６には、図示しない吸気ポート
（スワールポート）で生成されたスワールが導かれ、そ
のスワールが***部５５の周りを周回するようになって
いる。The raised portion 55 is formed in a cylindrical shape,
It is arranged at the center of the circular opening 52. Further, fuel is injected from the fuel injection nozzle 66 into the approaching portion 58 toward the vicinity of the connecting portion with the vertical portion 57. In addition, a swirl generated in an intake port (swirl port) not shown is guided to the combustion chamber 56, and the swirl circulates around the raised portion 55.
【００１９】上記燃焼室５６は、鋳造、鍛造、ダイキャ
ストまたは加工などによってピストン５０と一体的に成
形される。よって、低コストで製造できる。The combustion chamber 56 is formed integrally with the piston 50 by casting, forging, die casting or processing. Therefore, it can be manufactured at low cost.
【００２０】次に、上記燃焼室５６に噴射された燃料の
流れを説明する。Next, the flow of fuel injected into the combustion chamber 56 will be described.
【００２１】燃料噴射ノズル６６から噴射された燃料
（噴霧）は、助走部５８の始端側に当たって助走部５８
に沿って流れ、ある程度の慣性がついた後、助走部５８
の終端に接続された側凹部５９の段差部６４にて、側壁
５３から剥離する。これにより、燃料は、十分な運動エ
ネルギをもって側壁５３から剥離し、その剥離領域６７
にて十分な空気導入がなされる。The fuel (spray) injected from the fuel injection nozzle 66 hits the starting end side of the run-up portion 58 and hits the run-up portion 58.
Flow along the road, and after a certain amount of inertia is applied, the approach part 58
It is peeled off from the side wall 53 at the step 64 of the side recess 59 connected to the end of the. As a result, the fuel is separated from the side wall 53 with sufficient kinetic energy, and the separated area 67 is formed.
At this time, sufficient air is introduced.
【００２２】その後、燃料（噴霧）は、案内部６０に沿
って流れ、底凹部６１の段差部６５にて底壁５４から剥
離する。これにより、燃料（噴霧）には、再度空気導入
がなされ、空気導入が更に増加する。ここで、側壁５３
から底壁５４に導かれた燃料（噴霧）は、その途中で運
動エネルギが低下するものの、***部５５の周囲を流れ
るスワールに流されて運動エネルギを回復するので、底
凹部６１における剥離領域６８での空気導入が活発とな
る。Thereafter, the fuel (spray) flows along the guide portion 60 and is separated from the bottom wall 54 at the step portion 65 of the bottom recess 61. As a result, air is again introduced into the fuel (spray), and the air introduction is further increased. Here, the side wall 53
Although the kinetic energy of the fuel (spray) guided from the bottom wall 54 to the bottom wall 54 is lowered in the middle thereof, the fuel (spray) is flown by the swirl flowing around the raised portion 55 to recover the kinetic energy, so that the peeling region 68 in the bottom recess 61 is. The introduction of air in the air becomes active.
【００２３】また、上記段差部６４，６５は、円周状に
形成されているため、スワールを阻害することはなく、
スモークを却って悪化させることはない。このように、
この燃焼室５６における空気導入は、従来の領域７，８
は勿論のこと更に領域６７，６８でも行われるため、空
気導入箇所が増えた分だけスモークを減らすことができ
る。Further, since the step portions 64 and 65 are formed in a circular shape, they do not hinder the swirl.
Smoke will not be exacerbated. in this way,
The air is introduced into the combustion chamber 56 in the conventional areas 7 and 8.
Of course, since it is also performed in the regions 67 and 68, the smoke can be reduced by the increase in the number of air introduction points.
【００２４】また、棚厚さ６９も図４に示す棚厚さ１７
と同等であるため、棚の熱亀裂の心配も不要である。こ
の結果、低価格で信頼性の高い（即ち棚亀裂の心配がな
い）、しかもスモークが少ない燃焼室となる。The shelf thickness 69 is also the shelf thickness 17 shown in FIG.
Since it is equivalent to, there is no need to worry about thermal cracks on the shelves. The result is a low cost, highly reliable combustion chamber (i.e., no concern about shelf cracks) and low smoke.
【００２５】別の実施例を図３に示す。この実施例は、
本発明を所謂ザウラー型の燃焼室に適用したものであ
り、燃焼室の側壁５３と底壁５４との形状が前実施例
（リエントラント型）と僅かに異なる点を除いては同様
の構成となっているため、詳しい説明は割愛する。な
お、この燃焼室の***部５５は、案内部６０と繋がって
円錐状になっている。Another embodiment is shown in FIG. This example is
The present invention is applied to a so-called Sauler type combustion chamber, and has the same configuration except that the shapes of the side wall 53 and the bottom wall 54 of the combustion chamber are slightly different from those of the previous embodiment (reentrant type). Therefore, detailed explanation is omitted. The raised portion 55 of the combustion chamber is connected to the guide portion 60 and has a conical shape.
【００２６】[0026]
【発明の効果】以上説明したように本発明に係る直噴式
ディーゼルエンジンの燃焼室によれば、燃焼室の壁面に
沿って流れる噴射燃料への空気導入を向上することがで
き、スモークの発生を抑えることができる。As described above, according to the combustion chamber of the direct injection type diesel engine according to the present invention, it is possible to improve the introduction of air into the injected fuel flowing along the wall surface of the combustion chamber and to prevent the generation of smoke. Can be suppressed.
【図１】本発明の一実施例を示す直噴式ディーゼルエン
ジンの燃焼室の要部拡大図である。FIG. 1 is an enlarged view of a main part of a combustion chamber of a direct injection diesel engine showing an embodiment of the present invention.
【図２】上記直噴式ディーゼルエンジンの燃焼室が形成
されたピストンの側断面図である。FIG. 2 is a side sectional view of a piston in which a combustion chamber of the direct injection diesel engine is formed.
【図３】変形実施例を示す直噴式ディーゼルエンジンの
燃焼室の要部拡大図である。FIG. 3 is an enlarged view of a main part of a combustion chamber of a direct injection diesel engine showing a modified example.
【図４】従来例を示す直噴式ディーゼルエンジンの燃焼
室の要部拡大図である。FIG. 4 is an enlarged view of a main part of a combustion chamber of a direct injection diesel engine showing a conventional example.
【図５】別の従来例を示す直噴式ディーゼルエンジンの
燃焼室の要部拡大図である。FIG. 5 is an enlarged view of a main part of a combustion chamber of a direct injection diesel engine showing another conventional example.
【図６】別の従来例を示す直噴式ディーゼルエンジンの
燃焼室の要部拡大図である。FIG. 6 is an enlarged view of a main part of a combustion chamber of a direct injection diesel engine showing another conventional example.
【図７】別の従来例を示す直噴式ディーゼルエンジンの
燃焼室の要部拡大図である。FIG. 7 is an enlarged view of a main part of a combustion chamber of a direct injection diesel engine showing another conventional example.
【図８】別の従来例を示す直噴式ディーゼルエンジンの
燃焼室の要部拡大図である。FIG. 8 is an enlarged view of a main part of a combustion chamber of a direct injection diesel engine showing another conventional example.
５１ ピストン頂面 ５３ 側壁 ５４ 底壁 ５８ 助走部 ５９ 側凹部 ６１ 底凹部 ５５ ***部 51 piston top surface 53 side wall 54 bottom wall 58 run-up portion 59 side recess 61 bottom recess 55 raised portion
Claims (3)
側壁に噴射された燃料をその側壁に沿って底壁に導くよ
うにした直噴式ディーゼルエンジンの燃焼室において、
上記側壁に、噴射燃料を所定距離助走させる助走部を設
けると共に、その助走部の終端に助走された燃料を側壁
から剥離させる側凹部を設けたことを特徴とする直噴式
ディーゼルエンジンの燃焼室。1. A combustion chamber of a direct injection diesel engine in which fuel injected into a side wall of a cavity formed in a top surface of a piston is guided to a bottom wall along the side wall,
A combustion chamber of a direct injection type diesel engine, characterized in that the side wall is provided with an advancing portion for advancing the injected fuel by a predetermined distance, and a side recessed portion at the end of the advancing portion for separating the advancing fuel from the side wall.
から剥離させる底凹部を設けた請求項１記載の直噴式デ
ィーゼルエンジンの燃焼室。2. The combustion chamber of a direct injection diesel engine according to claim 1, wherein the bottom wall is provided with a bottom recess for separating the fuel introduced therein from the bottom wall.
周囲をスワール通路とした請求項２記載の直噴式ディー
ゼルエンジンの燃焼室。3. A combustion chamber for a direct injection diesel engine according to claim 2, wherein a ridge is formed in the center of the bottom wall, and the periphery thereof is a swirl passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7189461A JPH0941975A (en) | 1995-07-25 | 1995-07-25 | Combustion chamber of direct injection type diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7189461A JPH0941975A (en) | 1995-07-25 | 1995-07-25 | Combustion chamber of direct injection type diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0941975A true JPH0941975A (en) | 1997-02-10 |
Family
ID=16241662
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7189461A Pending JPH0941975A (en) | 1995-07-25 | 1995-07-25 | Combustion chamber of direct injection type diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0941975A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1264973A2 (en) | 2001-06-06 | 2002-12-11 | Mazda Motor Corporation | Diesel engine, fuel combustion method for diesel engine and method for designing a diesel engine |
| JP2003083120A (en) * | 2001-09-10 | 2003-03-19 | Mazda Motor Corp | Fuel combustion device for diesel engine |
| JP2003097274A (en) * | 2001-09-26 | 2003-04-03 | Mazda Motor Corp | Fuel combustion device for diesel engine |
-
1995
- 1995-07-25 JP JP7189461A patent/JPH0941975A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1264973A2 (en) | 2001-06-06 | 2002-12-11 | Mazda Motor Corporation | Diesel engine, fuel combustion method for diesel engine and method for designing a diesel engine |
| EP1264973A3 (en) * | 2001-06-06 | 2003-08-06 | Mazda Motor Corporation | Diesel engine, fuel combustion method for diesel engine and method for designing a diesel engine |
| JP2003083120A (en) * | 2001-09-10 | 2003-03-19 | Mazda Motor Corp | Fuel combustion device for diesel engine |
| JP2003097274A (en) * | 2001-09-26 | 2003-04-03 | Mazda Motor Corp | Fuel combustion device for diesel engine |
| JP4595273B2 (en) * | 2001-09-26 | 2010-12-08 | マツダ株式会社 | Diesel engine fuel combustion system |
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