DE2025804A1 - Pistons for internal combustion engines - Google Patents
Pistons for internal combustion enginesInfo
- Publication number
- DE2025804A1 DE2025804A1 DE19702025804 DE2025804A DE2025804A1 DE 2025804 A1 DE2025804 A1 DE 2025804A1 DE 19702025804 DE19702025804 DE 19702025804 DE 2025804 A DE2025804 A DE 2025804A DE 2025804 A1 DE2025804 A1 DE 2025804A1
- Authority
- DE
- Germany
- Prior art keywords
- piston according
- recess
- recesses
- concentric
- wall
- 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
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- 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
- F02B23/0645—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
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- 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
- F02B23/0678—Unconventional, complex or non-rotationally symmetrical shapes of the combustion space, e.g. flower like, having special shapes related to the orientation of the fuel spray jets
- F02B23/0687—Multiple bowls in the piston, e.g. one bowl per fuel spray jet
-
- 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)
Description
Kolben für Brennkraftmaschinen Die Erfindung bezieht sich auf Kolben mit im Kolbenboden ausgebildetem Brennraum für Kraftmaschinen mit innerer Verbrennung und Direkteinspritzung. Pistons for internal combustion engines The invention relates to pistons with a combustion chamber formed in the piston crown for engines with internal combustion and direct injection.
Gemäß der Erfindung ist bei einem solchen Kolben vorgesehen, daß der Brennraum aus wenigstens zwei konzentrischen, ringförmigen Hohlräumen bzw. Ausnehmungen besteht, die zur Beaufschlagung durch getrennte Düsen- oder Sprühstrahlen eines Einspritzventils bestimmt sind.According to the invention it is provided in such a piston that the Combustion chamber made up of at least two concentric, annular cavities or recesses exists, which are to be applied by separate nozzles or spray jets of a Injector are determined.
Dank einer derartigen Anordnung ist eine beträchtliche Steigerung der Turbulenz erzielbar und damit eine merkliche Verbesserung der Verbrennung, woraus sich bei gegebener Ausgangsleistung eine merkliche Kraftstoffersparnis bzw. bei gegebenem Kraftstoffverbrauch eine erhebliche Beistungssteigerung ergibt.Thanks to such an arrangement there is a considerable increase the turbulence achievable and thus a noticeable improvement in the combustion, from which with a given output power, a noticeable fuel saving or at given fuel consumption results in a considerable increase in performance.
Weitere Merkmale und Vorteile der erfindung gehen aus der nachstehenden Beschreibung eines Ausführungsbeispieles anhand der Zeichnung hervor0 Darin zeigt: Fig. 1 einen Axialschnitt eines erfindungagemäßen Kolbens und Fig. 2 eine axiale Stirnansicht des Kolbens nach Fig. 1.Other features and advantages of the invention are evident from the following Description of an exemplary embodiment based on the drawing, which shows: 1 shows an axial section of a piston according to the invention and FIG. 2 shows an axial section Front view of the piston according to FIG. 1.
Der in der Zeichnung dargestellte Kolben hat eine seitliche Wand 1 von herkömmlicher Ausführung und einen Boden 2, in welchem der Brennraum ausgebildet ist.The piston shown in the drawing has a side wall 1 of conventional design and a bottom 2 in which the combustion chamber is formed is.
Der Brennraum ist bei dem dargestellten Beispiel aus zwei ringfUrmigen, konzentrischen Hohlräumen oder Ausnehmungen 3 und 4 von im wesentlichem halbkreisförmigen Profil zusammengesetzt. In der Mitte der inneren Ausnehmung 3 ist eine einen Strahlteiler bildende konische Spitze 5 angeordnet, die zur Beaufschlagung durch einen mittleren Sprüh oder Düsenstrahl 6 eines Einspritzventils bestimmt ist.In the example shown, the combustion chamber consists of two ring-shaped, concentric cavities or recesses 3 and 4 of substantially semicircular shape Composite profile. In the middle of the inner recess 3 is a beam splitter forming conical tip 5 arranged to be acted upon by a middle Spray or nozzle jet 6 of an injection valve is intended.
Um die Ausnehmung 3 herum verläuft die zweite ringförmige Ausnehmung 4, deren Begrenzung gegenüber der Ausnehmung 3 einen Deflektor- oder Prallring 7 bildet.The second annular recess runs around the recess 3 4, the limitation of which in relation to the recess 3 is a deflector or impact ring 7 forms.
Nach außen ist die Ausnehmung 4 durch eine mehr oder weniger zylindrische bzw. konvergierende, im wesentlichen in Axialrichtung des Kolbens verlaufende Wandung 8 begrenzt, die in der OberfläChe 9 des Kolbensbodens 2 endet.To the outside, the recess 4 is more or less cylindrical or converging wall running essentially in the axial direction of the piston 8, which ends in the surface 9 of the piston head 2.
Die zylindrische Wandung 8 wird in einer in der Ausnehmung 4 abwärts verlaufenden Richtung durch mehrere, beispielsweise drei, Ddsen- oder Sprühstrahlen 10 eines Einspritzventils beaufschlagt. Die Strahlen 10 folgen der Form der halbkreisförmigen unteren Wandung der Ausnehmung 4 und treffen danr auf den mittleren Sprühstrahl 6, welcher nach Aufteilung mittels des im wesentlichen konischen, zentral angeordneten Strahlteilers 5, der halbkreisförmigen Wandung der Ausnehmung 3 folgt.The cylindrical wall 8 is in a recess 4 downwards extending direction by several, for example three, nozzle or spray jets 10 applied to an injection valve. The rays 10 follow the shape of the semicircular lower wall of the recess 4 and then hit the middle one Spray jet 6, which after division by means of the essentially conical, central arranged beam splitter 5, the semicircular wall of the recess 3 follows.
Aus dieser Anordnung ergibt sich eie nahezu verdoppelte Turbulenz, die sich auch besonders kräftig im rrittleren Teil des Brennraums bemerkbar macht und dadurch die Nachteile einer unregelmäßigen Verbrennung beseitigt, wie sie bei bekannten Ausführungen lurch unvollständige Verwirbelung hervorgerufen werden.This arrangement results in an almost doubled turbulence, which is also particularly noticeable in the rittleren part of the combustion chamber and thereby eliminates the disadvantages of irregular combustion, such as those at known designs are caused by incomplete turbulence.
Die Verwendung des erfindungsgemäßen Kolbens in Verbindung mit einem eine Mittelöffnung zur Erzeugung des mittleren Sprühstrahles 6 enthaltender. Einspritzventil ist besonders vorteilhaft. Das Einspritzventil h;lt nämlich dank dieser Mittelöffnung keine Verunreinigungen des eingespritzten Kraftstoffes zurllck, so daß seine Einspritzöffnungen nicht verstopfen. Damit bleibt das Verhältnis der Sprühstrahlen 6 und 10 zueinander und also auch das richtige Wirkungsverhältnis der Teile des im Kolbenboden 2 ausgebildeten Brennraums erhalten.The use of the piston of the invention in conjunction with a a central opening for generating the central spray jet 6 containing. Injector is particularly beneficial. This is because the injection valve stops thanks to this central opening no contaminants of the injected fuel back, so that its injection openings do not clog. The ratio of the spray jets 6 and 10 to one another thus remains and therefore also the correct ratio of the parts of the parts formed in the piston head 2 Preserve the combustion chamber.
Die Anzahl der konzentrischen ringförmigen Ausnehmungen kann selbstverständlich mehr als zwei betragen und ihr Verlauf kann anstatt kreisförmig auch vieleckig, elliptisch bzw. mehr oder weniger oval sein.The number of concentric annular recesses can of course be more than two and their course can also be polygonal instead of circular, be elliptical or more or less oval.
Claims (10)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT5201669 | 1969-05-28 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2025804A1 true DE2025804A1 (en) | 1971-02-18 |
Family
ID=11276210
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE7019671U Expired DE7019671U (en) | 1969-05-28 | 1970-05-26 | PISTONS FOR COMBUSTION MACHINERY. |
DE19702025804 Pending DE2025804A1 (en) | 1969-05-28 | 1970-05-26 | Pistons for internal combustion engines |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE7019671U Expired DE7019671U (en) | 1969-05-28 | 1970-05-26 | PISTONS FOR COMBUSTION MACHINERY. |
Country Status (1)
Country | Link |
---|---|
DE (2) | DE7019671U (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5084602U (en) * | 1973-12-11 | 1975-07-19 | ||
DE3327998A1 (en) * | 1983-08-03 | 1985-02-14 | Volkswagenwerk Ag, 3180 Wolfsburg | Diesel internal combustion engine with air-distributing direct fuel injection |
EP0397191A1 (en) * | 1989-05-12 | 1990-11-14 | Avia Koncern Praha | Combustion chamber for compression ignition internal combustion engine |
EP1517016A1 (en) * | 2003-09-22 | 2005-03-23 | Renault s.a.s. | Combustion chamber for reducing the soot emissions |
DE102006008567A1 (en) * | 2006-02-22 | 2007-08-23 | Fev Motorentechnik Gmbh | Combustion chamber arrangement of fuel-injected diesel engine has concave contour of piston bowl formed so that first and second fuels jets are directed onto each other and at least partially flow back in direction of central injector |
CN103437900A (en) * | 2013-08-02 | 2013-12-11 | 大连滨城活塞制造有限公司 | Piston top combustion chamber |
-
1970
- 1970-05-26 DE DE7019671U patent/DE7019671U/en not_active Expired
- 1970-05-26 DE DE19702025804 patent/DE2025804A1/en active Pending
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5084602U (en) * | 1973-12-11 | 1975-07-19 | ||
JPS5322642Y2 (en) * | 1973-12-11 | 1978-06-13 | ||
DE3327998A1 (en) * | 1983-08-03 | 1985-02-14 | Volkswagenwerk Ag, 3180 Wolfsburg | Diesel internal combustion engine with air-distributing direct fuel injection |
EP0397191A1 (en) * | 1989-05-12 | 1990-11-14 | Avia Koncern Praha | Combustion chamber for compression ignition internal combustion engine |
EP1517016A1 (en) * | 2003-09-22 | 2005-03-23 | Renault s.a.s. | Combustion chamber for reducing the soot emissions |
FR2860044A1 (en) * | 2003-09-22 | 2005-03-25 | Renault Sa | COMBUSTION CHAMBER FOR REDUCING SOOT EMISSIONS |
DE102006008567A1 (en) * | 2006-02-22 | 2007-08-23 | Fev Motorentechnik Gmbh | Combustion chamber arrangement of fuel-injected diesel engine has concave contour of piston bowl formed so that first and second fuels jets are directed onto each other and at least partially flow back in direction of central injector |
CN103437900A (en) * | 2013-08-02 | 2013-12-11 | 大连滨城活塞制造有限公司 | Piston top combustion chamber |
Also Published As
Publication number | Publication date |
---|---|
DE7019671U (en) | 1971-01-14 |
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