JPH06193448A - Combustion chamber of direct-injection type diesel engine - Google Patents
Combustion chamber of direct-injection type diesel engineInfo
- Publication number
- JPH06193448A JPH06193448A JP4344332A JP34433292A JPH06193448A JP H06193448 A JPH06193448 A JP H06193448A JP 4344332 A JP4344332 A JP 4344332A JP 34433292 A JP34433292 A JP 34433292A JP H06193448 A JPH06193448 A JP H06193448A
- Authority
- JP
- Japan
- Prior art keywords
- cavity
- guide surface
- combustion
- combustion chamber
- diesel engine
- 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
- F02B23/0672—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
- 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
-
- 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
- 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
【０００１】[0001]
【産業上の利用分野】本発明は、燃焼特性の向上を図っ
た直噴式ディーゼルエンジンの燃焼室に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion chamber of a direct injection diesel engine which has improved combustion characteristics.
【０００２】[0002]
【従来の技術】直噴式ディーゼルエンジンのピストン頂
面に凹設される燃焼室として、図４に示すものが知られ
ている（特開昭63-162925 号公報）。図示するようにこ
の燃焼室ａは、ピストン頂面ｂに、開口部ｃが小径で底
部ｄが大径に形成されたキャビティｅを凹設したもので
ある。このキャビティｅの開口部ｃには、ピストン頂面
ｂから略垂直下方に延出され、拡径されたキャビティ底
部ｄに滑らかに接続された案内面ｆが形成されている。2. Description of the Related Art As a combustion chamber recessed in the top surface of a piston of a direct injection diesel engine, the one shown in FIG. 4 is known (Japanese Patent Laid-Open No. 63-162925). As shown in the figure, the combustion chamber a has a cavity e formed on the top surface b of the piston with a small diameter opening c and a large diameter bottom d. At the opening c of the cavity e, there is formed a guide surface f which extends substantially vertically downward from the piston top surface b and is smoothly connected to the cavity bottom portion d having an enlarged diameter.
【０００３】この構成によれば、図４(a) に示すよう
に、圧縮行程時に生じるスキッシュ流Ｓは、案内面ｆに
沿ってスムースにキャビティ底部ｄに流入し、強いスキ
ッシュが生じる。この強いスキッシュにより、燃焼初期
において、空気と燃料との混合気がキャビティｅ内に満
遍なく行き渡り、良好な初期燃焼が得られる。According to this structure, as shown in FIG. 4 (a), the squish flow S generated during the compression stroke smoothly flows into the cavity bottom portion d along the guide surface f, and a strong squish is generated. Due to this strong squish, in the initial stage of combustion, the air-fuel mixture is evenly distributed in the cavity e, and good initial combustion is obtained.
【０００４】しかし、上記燃焼室ａでは、図４(b) に示
すように、膨脹行程時に生じる燃焼ガス流Ｇも、キャビ
ティ底部ｄからキャビティ外部へスムースに流れ出てし
まうため、拡散燃焼時における新気と混合気との攪拌が
少なく、黒煙が発生してしまう。However, in the combustion chamber a, as shown in FIG. 4 (b), the combustion gas flow G generated during the expansion stroke also smoothly flows out of the cavity bottom portion d to the outside of the cavity. There is little agitation between the air and the air-fuel mixture, and black smoke is generated.
【０００５】[0005]
【発明が解決しようとする課題】この対策として、図５
(b) に示すように、キャビティｅの開口部ｃの案内面ｆ
に径方向内方に縮径した棚ｇを設け、膨脹行程時にキャ
ビティ底部ｄからキャビティ外部へ流出する燃焼ガス流
Ｇをこの棚ｇによって攪拌するようにした燃焼室ｈが開
発されるに至った。As a countermeasure against this, FIG.
As shown in (b), the guide surface f of the opening c of the cavity e
A combustion chamber h has been developed in which a shelf g having a reduced diameter inward is provided in the inside thereof, and a combustion gas flow G flowing out of the cavity bottom portion d to the outside of the cavity during an expansion stroke is agitated by the shelf g. .
【０００６】しかし、この棚ｇは、図５(a) に示すよう
に、圧縮行程時に生じるスキッシュ流Ｓをも攪拌してし
まうため、乱れが発生してスキッシュが弱まってしま
う。この結果、スキッシュ流Ｓの一部Ｓ1 がキャビティ
ｅ内の一部分に滞留することとなり、燃焼初期において
その一部分でのみ空気と燃料との混合が盛んになり、急
激な初期燃焼が生じてＮＯｘが増加してしまう。また、
スキッシュ流Ｓが乱れるため、燃料噴射ノズル（図示せ
ず）から噴射された燃料の広がりも乱れてしまう。However, as shown in FIG. 5 (a), this shelf g also agitates the squish flow S generated during the compression stroke, so that turbulence occurs and the squish weakens. As a result, a part S 1 of the squish flow S stays in a part of the cavity e, the air and the fuel are actively mixed only in that part in the initial stage of combustion, and a rapid initial combustion occurs to generate NOx. Will increase. Also,
Since the squish flow S is disturbed, the spread of the fuel injected from the fuel injection nozzle (not shown) is also disturbed.
【０００７】すなわち、図４および図５に示す燃焼室
ａ，ｈでは、圧縮行程時か膨脹行程時かのいずれか一方
の特性しか良好にならず、初期燃焼時のＮＯｘの低減と
拡散燃焼時の黒煙の低減とを両立することができなかっ
た。That is, in the combustion chambers a and h shown in FIGS. 4 and 5, only one of the characteristics during the compression stroke or during the expansion stroke is good, and NOx is reduced during initial combustion and diffusion combustion is performed. It was not possible to achieve both reduction of black smoke.
【０００８】以上の事情を考慮して創案された本発明の
目的は、圧縮行程時のスキッシュ流を弱めることなく膨
脹行程時の燃焼ガス流の攪拌を良好にでき、ＮＯｘの低
減と黒煙の低減とを両立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。The object of the present invention, which was devised in view of the above circumstances, is that the combustion gas flow can be well agitated during the expansion stroke without weakening the squish flow during the compression stroke, reducing NOx and producing black smoke. It is to provide a combustion chamber for a direct injection diesel engine that can achieve both reductions.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に本発明は、ピストン頂面に、開口部が小径で底部が大
径のキャビティを凹設し、該キャビティの開口部に、キ
ャビティ外部からキャビティ底部へスキッシュ流を導く
と共にキャビティ底部からキャビティ外部へ燃焼ガス流
を導く案内面を形成し、該案内面に、その周方向に沿っ
て溝部を形成したことを特徴としている。In order to achieve the above object, the present invention provides a cavity in which a small diameter opening and a large diameter bottom portion are formed in the top surface of a piston, and the cavity is formed in the opening portion of the cavity. From the cavity to the bottom of the cavity and a guide surface to guide the flow of the combustion gas from the bottom of the cavity to the outside of the cavity, and a groove is formed on the guide surface along the circumferential direction.
【００１０】[0010]
【作用】上記構成によれば、圧縮行程時にキャビティ外
部からキャビティ底部へ流入するスキッシュ流は、キャ
ビティ内がそれほど高圧になっていないことから、案内
面に設けられた溝部の上方を通過してその影響を受ける
ことなく導かれる。よって、スキッシュ流の勢いが溝部
により弱まることはなく、良好な初期燃焼が得られる。According to the above construction, the squish flow flowing from the outside of the cavity to the bottom of the cavity during the compression stroke does not reach a high pressure inside the cavity, and therefore passes over the groove provided on the guide surface, Guided without being affected. Therefore, the momentum of the squish flow is not weakened by the groove portion, and good initial combustion can be obtained.
【００１１】他方、膨脹行程時にキャビティ底部からキ
ャビティ外部へ流出する燃焼ガス流は、キャビティ内に
生じた爆発圧力に押されるので、案内面に設けられた溝
部に沿って流れ、その流れが攪乱される。よって、拡散
燃焼が活発になる。On the other hand, the combustion gas flow flowing from the bottom of the cavity to the outside of the cavity during the expansion stroke is pushed by the explosion pressure generated in the cavity, so that it flows along the groove provided on the guide surface and the flow is disturbed. It Therefore, diffusion combustion becomes active.
【００１２】[0012]
【実施例】以下に本発明の一実施例を添付図面に基づい
て説明する。An embodiment of the present invention will be described below with reference to the accompanying drawings.
【００１３】図２に直噴式ディーゼルエンジンに用いら
れるピストン１の縦断面図を、図３にそのピストン１の
平面図を示す。図示するように、ピストン頂面２に、開
口部３が小径で底部４が大径のキャビティ５が凹設され
ている。このキャビティ５の開口部３には、ピストン頂
面２から略垂直下方に延出され、拡径されたキャビティ
底部４に滑らかに接続された案内面６が形成されてい
る。FIG. 2 is a vertical sectional view of a piston 1 used in a direct injection diesel engine, and FIG. 3 is a plan view of the piston 1. As shown in the figure, a cavity 5 having a small diameter opening 3 and a large diameter bottom 4 is formed in the top surface 2 of the piston. A guide surface 6 is formed in the opening 3 of the cavity 5 so as to extend substantially vertically downward from the piston top surface 2 and to be smoothly connected to the cavity bottom 4 having an enlarged diameter.
【００１４】この案内面６は、図１(a) に示すように圧
縮行程時にキャビティ外部７からキャビティ底部４へス
キッシュ流Ｓを導くと共に、図１(b) に示すように膨脹
行程時にキャビティ底部４からキャビティ外部７へ燃焼
ガス流Ｇを導くガイドとして機能する。また、キャビテ
ィ底部４の中心には、軸方向上方に突出した円柱状の突
起部８が形成されている。この突起部８とキャビティ底
面９と滑らかに接続されており、キャビティ底部４に略
ドーナッツ上の燃焼空間１０が形成されている。The guide surface 6 guides the squish flow S from the outside of the cavity 7 to the cavity bottom portion 4 during the compression stroke as shown in FIG. 1 (a), and at the same time as in the expansion stroke as shown in FIG. 1 (b). It functions as a guide for guiding the combustion gas flow G from 4 to the outside 7 of the cavity. Further, at the center of the cavity bottom portion 4, there is formed a columnar projection portion 8 which projects upward in the axial direction. The projection 8 and the bottom surface 9 of the cavity are smoothly connected to each other, and a combustion space 10 that is substantially donut-shaped is formed in the bottom 4 of the cavity.
【００１５】本実施例の特長とするところは、キャビテ
ィ開口部３に形成された案内面６に、その周方向に沿っ
て溝部１１を形成した点にある。この溝部１１は、図１
に示すように案内面６の略中央部に、複数の曲率のカー
ブを繋げて滑らかに窪まされて形成されている。詳しく
は、溝部１１の上方の曲率Ｒ3 ，下方の曲率Ｒ2 ，さら
にその下方の曲率Ｒ1 の関係は、Ｒ3 ＜＜Ｒ2 ≦Ｒ1 と
なっている。この形状によれば、案内面６を上方から下
方へ流れるスキッシュ流ＳはＲ3 の曲率がきついため溝
部１１の上を通過し易く、下方から上方へ流れる燃焼ガ
ス流ＧはＲ1 およびＲ2 の曲率が緩いため溝部１１に沿
って流れ易くなる。A feature of this embodiment is that a groove portion 11 is formed on the guide surface 6 formed in the cavity opening 3 along the circumferential direction thereof. This groove 11 is shown in FIG.
As shown in FIG. 5, the guide surface 6 is formed so as to be smoothly recessed by connecting a plurality of curves of curvature at a substantially central portion thereof. Specifically, the relationship between the curvature R 3 above the groove 11, the curvature R 2 below, and the curvature R 1 below that is R 3 << R 2 ≤R 1 . According to this shape, the squish flow S flowing from the upper side to the lower side of the guide surface 6 easily passes over the groove portion 11 because the curvature of R 3 is tight, and the combustion gas flow G flowing from the lower side to the upper side is R 1 and R 2. Has a gentle curvature, so that it easily flows along the groove 11.
【００１６】このような燃焼室内（キャビティ５内）に
は、シリンダヘッドに取り付けられた燃料噴射ノズルか
ら燃料が噴射されるようになっている。この燃料噴射ノ
ズルは燃焼室の中心に配置されており、そこからキャビ
ティ５の側面へ向けて燃料を噴射するようになってい
る。また、かかる燃焼室内には、吸気ポートで形成され
たピストン周方向のスワールが流入するようになってい
る。なお、図例では円状のキャビティ５を示したがこれ
に限らず四角状のキャビティであってもよい。Fuel is injected into such a combustion chamber (cavity 5) from a fuel injection nozzle attached to the cylinder head. This fuel injection nozzle is arranged at the center of the combustion chamber, and is configured to inject fuel from there to the side surface of the cavity 5. Further, a swirl in the circumferential direction of the piston formed by the intake port flows into the combustion chamber. Although the circular cavity 5 is shown in the illustrated example, the present invention is not limited to this and may be a square cavity.
【００１７】以上の構成からなる本実施例の作用につい
て圧縮行程時と膨脹行程時とに分けて説明する。The operation of this embodiment having the above construction will be described separately for the compression stroke and the expansion stroke.
【００１８】《圧縮行程時》圧縮行程時にピストン頂面
２とシリンダヘッド内面との間に挟まれて生じるスキッ
シュ流Ｓは、図１(a) に示すように、キャビティ外部７
から案内面６に沿って流れてキャビティ底部４へ流入
し、キャビティ底部４の燃焼空間１０において縦スワー
ルとなる。<< During the compression stroke >> The squish flow S generated by being sandwiched between the top surface 2 of the piston and the inner surface of the cylinder head during the compression stroke is, as shown in FIG.
Flow along the guide surface 6 into the cavity bottom 4 and form a vertical swirl in the combustion space 10 of the cavity bottom 4.
【００１９】このとき案内面６に沿って流れるスキッシ
ュ流Ｓは、縮径されたキャビティ開口部３を巻き込むよ
うに図示する角度にて流入するので、案内面６の略中央
部では壁面から剥離した状態となる。また、溝部１１の
上方の案内面６の曲率Ｒ3 がきつく形成されているた
め、これも上方から下方へ流れるスキッシュ流Ｓの剥離
を促している。また、このときキャビティ５内は、燃焼
が始まっていないか或いは始まっていても極初期の段階
なのでそれほど高圧になっておらず、剥離したスキッシ
ュ流Ｓがその燃焼圧力に押されて溝部１１内に押し付け
られることはない。At this time, the squish flow S flowing along the guide surface 6 flows in at an angle shown so as to wrap around the cavity opening 3 having a reduced diameter, so that it is separated from the wall surface at the substantially central portion of the guide surface 6. It becomes a state. Further, since the curvature R 3 of the guide surface 6 above the groove portion 11 is tightly formed, this also promotes separation of the squish flow S flowing from above to below. Further, at this time, the inside of the cavity 5 is not so high because combustion has not started, or even if it has started, it is in the very early stage, and the separated squish flow S is pushed by the combustion pressure into the groove 11. It cannot be pressed.
【００２０】従って、圧縮行程時に生じるスキッシュ流
Ｓは、案内面６に設けられた溝部１１の上方を通過して
流れ、溝部１１の影響を受けることなく、スムースにそ
の強い勢力を保ったままキャビティ底部４の燃焼空間１
０に導かれる。このように強いスキッシュ流Ｓが保たれ
るので、図４(a) のタイプと同様に、燃焼初期において
空気と燃料との混合気がキャビティ５内に満遍なく行き
渡り、良好な初期燃焼が得られる。よって、急激な初期
燃焼が回避され、ＮＯｘが低減する。Therefore, the squish flow S generated during the compression stroke flows above the groove portion 11 provided in the guide surface 6 and is not affected by the groove portion 11 and smoothly maintains its strong force and is kept in the cavity. Combustion space 1 at the bottom 4
Lead to zero. Since the strong squish flow S is maintained in this manner, as in the case of the type shown in FIG. 4 (a), the air-fuel mixture is evenly distributed in the cavity 5 at the initial stage of combustion, and good initial combustion is obtained. Therefore, abrupt initial combustion is avoided and NOx is reduced.
【００２１】《膨脹行程時》他方、膨脹行程時にキャビ
ティ底部４の燃焼空間１０において発生した燃焼ガス流
Ｇは、図１(b) に示すように、キャビティ底部４から案
内面６に沿って流れ、キャビティ外部７へ流出する。こ
のとき、案内面６に沿って流出する燃焼ガス流Ｇは、キ
ャビティ５内に生じた高圧の爆発圧力Ｐによって押さ
れ、案内面６に設けられた溝部１１に押し付けられなが
ら流れる。また、溝部１１の下方の案内面の曲率Ｒ1 ，
Ｒ2 が緩いため、下方から上方へ流れる燃焼ガス流Ｇは
一層溝部１１に沿って流れ易くなる。[During expansion stroke] On the other hand, the combustion gas flow G generated in the combustion space 10 at the bottom of the cavity 4 during the expansion stroke flows from the cavity bottom 4 along the guide surface 6 as shown in FIG. 1 (b). , Out of the cavity 7. At this time, the combustion gas flow G flowing out along the guide surface 6 is pushed by the high-pressure explosion pressure P generated in the cavity 5 and flows while being pressed against the groove portion 11 provided in the guide surface 6. In addition, the curvature R 1 of the guide surface below the groove portion 11,
Since R 2 is gentle, the combustion gas flow G flowing from the lower side to the upper side becomes easier to flow along the groove 11.
【００２２】この結果、膨脹行程時に生じる燃焼ガス流
Ｇは、案内面６の溝部１１によってその流れが攪乱さ
れ、図５(b) のタイプと同様に拡散燃焼における混合気
と新気との混合が活発になり、良好な拡散燃焼が得られ
る。よって、拡散燃焼時の不完全燃焼が回避され、黒煙
が低減する。As a result, the combustion gas flow G generated during the expansion stroke is disturbed by the groove portion 11 of the guide surface 6, and the mixture of the air-fuel mixture and the fresh air in the diffusion combustion is mixed as in the type of FIG. 5 (b). Becomes active and good diffusion combustion is obtained. Therefore, incomplete combustion during diffusion combustion is avoided, and black smoke is reduced.
【００２３】[0023]
【発明の効果】以上説明したように本発明によれば、圧
縮行程時のスキッシュ流を弱めることなく膨脹行程時の
燃焼ガス流の攪拌を良好にすることが可能となる。よっ
て、従来不可能であったＮＯｘの低減と黒煙の低減とを
両立することができる。As described above, according to the present invention, it is possible to improve the agitation of the combustion gas flow during the expansion stroke without weakening the squish flow during the compression stroke. Therefore, it is possible to achieve both the reduction of NOx and the reduction of black smoke, which were impossible in the past.
【図１】本発明の一実施例を示す直噴式ディーゼルエン
ジンの燃焼室の部分側断面図であり、(a) は圧縮行程，
(b) は膨脹行程を示す。FIG. 1 is a partial side sectional view of a combustion chamber of a direct injection diesel engine showing an embodiment of the present invention, in which (a) is a compression stroke,
(b) shows the expansion stroke.
【図２】上記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 the combustion chamber is formed.
【図３】上記ピストンの平面図である。FIG. 3 is a plan view of the piston.
【図４】従来例を示す直噴式ディーゼルエンジンの燃焼
室の側断面図であり、(a) は圧縮行程，(b) は膨脹行程
を示す。FIG. 4 is a side sectional view of a combustion chamber of a direct injection diesel engine showing a conventional example, in which (a) shows a compression stroke and (b) shows an expansion stroke.
【図５】別の従来例を示す直噴式ディーゼルエンジンの
燃焼室の側断面図であり、(a)は圧縮行程，(b) は膨脹
行程を示す。FIG. 5 is a side sectional view of a combustion chamber of a direct injection diesel engine showing another conventional example, in which (a) shows a compression stroke and (b) shows an expansion stroke.
１ ピストン ２ ピストン頂面 ３ 開口部 ４ 底部 ５ キャビティ ６ 案内面 ７ 外部 １１ 溝部 Ｓ スキッシュ流 Ｇ 燃焼ガス流 1 Piston 2 Piston Top Surface 3 Opening 4 Bottom 5 Cavity 6 Guide Surface 7 External 11 Groove S Squish Flow G Combustion Gas Flow
Claims (1)
大径のキャビティを凹設し、該キャビティの開口部に、
キャビティ外部からキャビティ底部へスキッシュ流を導
くと共にキャビティ底部からキャビティ外部へ燃焼ガス
流を導く案内面を形成し、該案内面に、その周方向に沿
って溝部を形成し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 cavity having a small diameter opening and a large diameter bottom is recessed on the top surface of the piston, and the cavity has an opening.
A direct injection type characterized by forming a guide surface for guiding a squish flow from the outside of the cavity to the bottom of the cavity and for guiding a combustion gas flow from the bottom of the cavity to the outside of the cavity, and forming a groove along the circumferential direction on the guide surface. Diesel engine combustion chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4344332A JPH06193448A (en) | 1992-12-24 | 1992-12-24 | Combustion chamber of direct-injection type diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4344332A JPH06193448A (en) | 1992-12-24 | 1992-12-24 | Combustion chamber of direct-injection type diesel engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06193448A true JPH06193448A (en) | 1994-07-12 |
Family
ID=18368426
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4344332A Pending JPH06193448A (en) | 1992-12-24 | 1992-12-24 | Combustion chamber of direct-injection type diesel engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06193448A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7441535B2 (en) | 2004-10-14 | 2008-10-28 | Yanmar Co., Ltd. | Shape of combustion chamber for direct-injection diesel engine |
-
1992
- 1992-12-24 JP JP4344332A patent/JPH06193448A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7441535B2 (en) | 2004-10-14 | 2008-10-28 | Yanmar Co., Ltd. | Shape of combustion chamber for direct-injection diesel engine |
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