DE755495C - Cylinder head for internal combustion engines with roof-shaped dead space wall - Google Patents
Cylinder head for internal combustion engines with roof-shaped dead space wallInfo
- Publication number
- DE755495C DE755495C DEJ72368D DEJ0072368D DE755495C DE 755495 C DE755495 C DE 755495C DE J72368 D DEJ72368 D DE J72368D DE J0072368 D DEJ0072368 D DE J0072368D DE 755495 C DE755495 C DE 755495C
- Authority
- DE
- Germany
- Prior art keywords
- dead space
- roof
- cylinder head
- internal combustion
- combustion engines
- 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
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/42—Shape or arrangement of intake or exhaust channels in cylinder heads
- F02F1/4214—Shape or arrangement of intake or exhaust channels in cylinder heads specially adapted for four or more valves per cylinder
-
- 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
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F2001/244—Arrangement of valve stems in cylinder heads
- F02F2001/245—Arrangement of valve stems in cylinder heads the valve stems being orientated at an angle with the cylinder axis
-
- 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)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
Bei Zylinderköpfen für Brennkraftmaschinen mit dachförmiger Totraumwand werden die Aus- und Einlaßventile in je einer Dachfläche getrennt angeordnet, so daß ihre Achsen in Richtung auf den Totraum einander zustreben. Bei Brennkraftmaschinen ist es nun aber üblich, die Ein- und Auslaßzeiten der Ventile sich überschneiden zu lassen, damit eine gewisse Spülung des Totraumes (Brennraumes) erreicht -wird. Eine einwandfreie Spülung des Brennraumes ist jedoch auf diese Weise gerade bei Zylindern mit dachförmig gestalteter Totraumwand nicht gewährleistet, da bei größeren Überschneidungen der Ventilöffnungszeiten die Ventilteller in Nähe des Dachfirstes innerhalb des Totraumes sich einander stark nähern und somit an dieser Stelle das Hindurchströmen der durch die Einlaßventile eintretenden Frischluft durch den Totraum stark drosseln. Der Abstand der Ein- und Auslaßventilteller innerhalb des Totraumes ist unter Umständen bei längeren Überschneidungen für eine bestimmte Zeit so gering, daß sozusagen ein Kanal zwischen Einlaß- und Auslaßöffnung .im Zylinderkopf entsteht, welcher für den Durchstrom der Frischluft einen bequemeren Weg darstellt als die übrigen, zwischen den Begrenzungsflächen des Totraumes und den Ventiltellern drosselnd wirkenden Spalte. Die Frischluft gelangt daher nur zum geringsten Teil in den Totraum, während der weit größere Teil der Frischluft ungehindert über den bequemeren Weg zur Auslaßöffnung des Auslaßventils ungenutzt abströmt. Dies hat nicht allein eine mangelhafte Spülung des Brennraumes, sondern darüber hinaus einen hohen Frischluftbedarf zur Folge, welchem der Lader häufig, insbesondere oberhalb der Volldruckhöhe nicht gewachsen ist, so daß Leistungsverluste eintreten.In cylinder heads for internal combustion engines with a roof-shaped dead space wall if the exhaust and intake valves are each arranged separately in a roof area, see above that their axes tend towards each other in the direction of the dead space. In internal combustion engines it is now common for the inlet and outlet times of the valves to overlap so that a certain amount of flushing of the dead space (combustion chamber) is achieved. In this way, however, the combustion chamber can be properly flushed Cylinders with a roof-shaped dead space wall are not guaranteed because larger ones Overlapping of the valve opening times the valve disc near the roof ridge approach each other closely within the dead space and thus at this point the The fresh air entering through the inlet valves flows through the dead space throttle strongly. The distance between the inlet and outlet valve disks within the dead space is under certain circumstances so small for a certain period of time with longer overlaps, that, so to speak, a channel is created between the inlet and outlet opening in the cylinder head, which is a more convenient way for fresh air to flow through than that the rest, throttling between the boundary surfaces of the dead space and the valve disks acting column. The fresh air therefore only reaches the smallest part of the dead space, while the far greater part of the fresh air is unhindered via the more comfortable route flows unused to the outlet opening of the outlet valve. This doesn't have one alone Inadequate flushing of the combustion chamber, but also a high demand for fresh air as a result, which the loader often does not, especially above full pressure altitude has grown, so that performance losses occur.
Gemäß der Erfindung werden diese Nachteile dadurch vermieden, daß die Firstlinie des Totraumes so angeordnet wird, daß die durch sie parallel zur Zylinderachse gelegte Ebene die Auslaßöffnung anschneidet. Die bei dieser Anordnung entstehende Nische ist dabei vorteilhaft gewölbt ausgebildet, während der übrige Teil des Totraumes entlang der Firstlinie zweckmäßig einen leicht abgerundeten Querschnitt erhält, so daß Wirbelbildungen zuverlässig vermieden werden.According to the invention, these disadvantages are avoided in that the ridge line of the dead space is arranged so that the through it parallel to The plane on the cylinder axis intersects the exhaust port. The in this arrangement resulting niche is advantageously arched, while the rest Part of the dead space along the ridge line expediently has a slightly rounded cross-section obtained so that vortex formation can be reliably avoided.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt, und zwar zeigt Abb. 1 einen OOuerschnitt durch einen Zylinderkopf mit dachförmigerTötraumwand nach der Schnittlinie I-I in Abb. 2, während Abb. 2 eine Draufsicht auf den Zylinderkopf gemäß der Schnittlinie II-II in Abb. i vermittelt.In the drawing, an embodiment of the invention is shown, Fig. 1 shows a cross section through a cylinder head with a roof-shaped dead space wall according to the section line I-I in Fig. 2, while Fig. 2 is a plan view of the cylinder head mediated according to the section line II-II in Fig. i.
Der Zylinderkopf z besitzt eine asymmetrische Abdachung, welche durch die seitlich verlagerte Anordnung des Firstes 2 bedingt ist. Das obere Ende des Totraum-es 3 findet seine Begrenzung durch die Dachflächen .I, 5.The cylinder head z has an asymmetrical roof, which by the laterally displaced arrangement of the ridge 2 is conditional. The top of the Dead space - it 3 is limited by the roof surfaces .I, 5.
In der kleineren Dachfläche q. liegt die Auslaßöffnung 6 für das Auslaßventil 7. Die Auslaßöffnung 6 wird von der durch die Schnittlinie 8 der beiden Dachebenen zur Zylinderachse parallel verlaufenden Ebene E-E angeschnitten. Die an der Schnittstelle entstehende Nische 9 ist zwecks Vermeidung von Wirbelbildungen gewölbt ausgebildet.In the smaller roof area q. is the outlet opening 6 for the outlet valve 7. The outlet opening 6 is from the intersection line 8 of the two roof levels the plane E-E running parallel to the cylinder axis. The one at the interface resulting niche 9 is arched in order to avoid the formation of eddies.
In der größeren Dachfläche 5 liegen die Öffnungen 1o für die Einlaßventile ii. Durch diese Anordnung der Ventile 7, 11 wird erreicht, daß bei Überschneidung der Ein- und Auslaßzeiten die durch die Einlaßöffnungen io eintretende Frischluft den gesamten Totraum 3 durchströmt.In the larger roof area 5 are the openings 1o for the inlet valves ii. This arrangement of the valves 7, 11 ensures that if they overlap the inlet and outlet times the fresh air entering through the inlet openings io flows through the entire dead space 3.
Die Spülung des Totraumes geht folgendermaßen vor sich: Ist zu Beginn der Überschneidung der`Ein-und Auslaßzeiten das Auslaßventil 7 geöffnet, während die Einlaßventile i i zu öffnen beginnen, so wirkt im nächsten Augenblick der Auslaßventilteller 12 als die Frischluft in den Totraum 3 abweisender Schirm. Die stärkste Drosselung in Richtung auf die Auslaßöffnung in Nähe der Nische 9 erfährt der Frischluftstrom beim Beginn des Eintauchens des Auslaßv entiltellers 12 in die Nische 9. Kurz vor dem Schließen des Auslaßventils 7 kann die Frischluft nur noch an der der Linie 8 abgekehrten Seite des Auslaßventils 7 ins Freie gelangen, und es ist somit ein° gründliche Ausspülung des Totraumes 3 gewährleistet.The flushing of the dead space proceeds as follows: Is at the beginning the overlap of the`Ein and Auslaßzeiten the exhaust valve 7 opened while the inlet valves i i begin to open, the outlet valve disk acts in the next instant 12 as the screen which repels the fresh air in the dead space 3. The strongest throttling in the direction of the outlet opening in the vicinity of the niche 9 experiences the fresh air flow at the beginning of the immersion of the outlet valve 12 in the niche 9. Shortly before the closing of the exhaust valve 7, the fresh air can only be at the line 8 remote side of the exhaust valve 7 get into the open, and it is thus a ° thorough rinsing of the dead space 3 guaranteed.
Die durch die Erfindung vermittelte Lehre gilt selbstverständlich sinngemäß auch für Zylinderköpfe mit mehreren Auslaßventilen, z. B. mit zwei Auslaß- und zwei Einlaßventilen.The teaching conveyed by the invention applies of course correspondingly also for cylinder heads with several exhaust valves, e.g. B. with two outlet and two inlet valves.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEJ72368D DE755495C (en) | 1942-05-30 | 1942-05-30 | Cylinder head for internal combustion engines with roof-shaped dead space wall |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEJ72368D DE755495C (en) | 1942-05-30 | 1942-05-30 | Cylinder head for internal combustion engines with roof-shaped dead space wall |
Publications (1)
Publication Number | Publication Date |
---|---|
DE755495C true DE755495C (en) | 1954-10-25 |
Family
ID=7208216
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEJ72368D Expired DE755495C (en) | 1942-05-30 | 1942-05-30 | Cylinder head for internal combustion engines with roof-shaped dead space wall |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE755495C (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3041660A1 (en) * | 1980-11-05 | 1982-05-13 | Daimler-Benz Ag, 7000 Stuttgart | Reciprocating internal combustion engine - has inlet and exhaust valve openings positioned to give complete scavenging |
EP0068336A1 (en) * | 1981-06-26 | 1983-01-05 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Two-cylinder four-stroke boxer engine, particularly for a motor cyle, cooled by the oncoming air flux |
US4660529A (en) * | 1981-04-22 | 1987-04-28 | Yamaha Hatsudoki Kabushiki Kaisha | Four-cycle engine |
DE19923902A1 (en) * | 1999-05-25 | 2000-11-30 | Heinz Leiber | Internal combustion engine |
WO2001016469A1 (en) * | 1999-09-01 | 2001-03-08 | Zalkin, Anthony, Louis | Internal combustion engine |
-
1942
- 1942-05-30 DE DEJ72368D patent/DE755495C/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3041660A1 (en) * | 1980-11-05 | 1982-05-13 | Daimler-Benz Ag, 7000 Stuttgart | Reciprocating internal combustion engine - has inlet and exhaust valve openings positioned to give complete scavenging |
US4660529A (en) * | 1981-04-22 | 1987-04-28 | Yamaha Hatsudoki Kabushiki Kaisha | Four-cycle engine |
USRE33787E (en) * | 1981-04-22 | 1992-01-07 | Yamaha Hatsudoki Kabushiki Kaisha | Four-cycle engine |
EP0068336A1 (en) * | 1981-06-26 | 1983-01-05 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Two-cylinder four-stroke boxer engine, particularly for a motor cyle, cooled by the oncoming air flux |
WO1983000188A1 (en) * | 1981-06-26 | 1983-01-20 | Seidl, Jiri | Four-stroke, twin cylinder boxer engine, particularly cooledby a mbiant air for motorcycles |
EP0113450A1 (en) * | 1981-06-26 | 1984-07-18 | Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 | Cylinder head for a four-stroke internal-combustion engine |
DE19923902A1 (en) * | 1999-05-25 | 2000-11-30 | Heinz Leiber | Internal combustion engine |
WO2001016469A1 (en) * | 1999-09-01 | 2001-03-08 | Zalkin, Anthony, Louis | Internal combustion engine |
US6615795B2 (en) | 1999-09-01 | 2003-09-09 | Anthony Louis Zalkin | Internal combustion engine |
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