EP0296320A2 - Cylinder head for an internal combustion engine - Google Patents
Cylinder head for an internal combustion engine Download PDFInfo
- Publication number
- EP0296320A2 EP0296320A2 EP88105551A EP88105551A EP0296320A2 EP 0296320 A2 EP0296320 A2 EP 0296320A2 EP 88105551 A EP88105551 A EP 88105551A EP 88105551 A EP88105551 A EP 88105551A EP 0296320 A2 EP0296320 A2 EP 0296320A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- web
- cylinder head
- openings
- insert
- incisions
- 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.)
- Granted
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 19
- 238000005266 casting Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- 239000002184 metal Substances 0.000 description 3
- 238000005336 cracking Methods 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
Images
Classifications
-
- 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
- F02F1/26—Cylinder heads having cooling means
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
Definitions
- the invention relates to a cylinder head for an internal combustion engine, which in the web area between the intake and exhaust valves of its wall delimiting the combustion chamber has at least one web insert which consists of a pouring part and is embedded in this wall such that it essentially has a main dimension extends perpendicular to their surface.
- the invention is therefore based on the object in a cylinder head of the type mentioned to avoid the occurrence of hot cracks at the bottom of the expansion joints receiving the expansion joints when the cylinder head cools after it has been poured, by a corresponding reduction in the shrinkage stresses acting on the expansion joint base. Since the material stresses that arise during cooling after casting are reduced by the subsequent heat treatment, the invention is based, in particular, on the object of preventing cracking by shrinkage stresses, at least until they are reduced by the heat treatment.
- the web insert has at least one opening, a window or a side incision. In this way, a complete separation of the material of the cylinder head located on both sides of the web insert is avoided, rather the material is connected through the opening, the window or the incision.
- the expansion joint can thus fulfill its intended function, namely the deflection of the tensile and compressive stresses caused by temperature changes into cooler material areas of the cylinder head, without cracks appearing on the base of the expansion joint.
- the web insert can have one or more such openings or windows or side incisions, and these can have a wide variety of shapes, such as, for example, circular shape, elongated hole shape, rectangular shape, square shape or the like.
- the area or the sum of the areas of the openings or windows or incisions should be dimensioned such that they can absorb at least the desired part of the shrinkage stresses acting on the joint base, whereby they However, it should not be larger than the smallest cross-sectional area of the web, based (limited) on the depth of the web insert, in order to act as a predetermined breaking point under operating voltages and not to cancel out the effect of the expansion joint. It may be advantageous that the distance between the center of the openings or openings, windows or incisions is at least a quarter of the total depth of the web inserts.
- FIGS. 1 to 3 have the same dimensions and are curved in their area to be poured into the cylinder head, which is at the top in the figures.
- the insert in the embodiment according to FIG. 1 has a single window-like opening 1 in the form of an elongated hole, while the embodiment according to FIG. 2 instead has three window-like openings 2 in a circular shape.
- two rows of smaller, hole-like openings 3 with a circular cross section are provided.
- Figure 4 illustrates that the web inserts are poured into the cylinder head 1 only with their curved part containing the opening 1, and in such a way that their main dimensions extend substantially perpendicular to their surface.
- the other part of the web inlays forms a retaining tab 10, which serves to fix the web inlay in the casting mold during casting. It is then separated from the finished casting with its length protruding beyond the casting surface 11 by mechanical processing.
- 4 also shows the gap width s which would result in the case of cylinder heads 4 with a web insert 5 cast therein, which does not have the openings, windows or incisions provided according to the invention.
- FIG 5 and 6 show a cylinder head which has two web inserts 8 which are arranged on the two sides of the web 7 located between the valve openings 6 in the cylinder head floor.
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- 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)
Abstract
Zylinderkopf (4) für eine Brennkraftmaschine, der im Stegbereich zwischen den Ein- und Auslaßventilen mindestens eine in den Zylinderkopf eingebettete Stegeinlage (5) hat. Um das Auftreten von Warmrissen am Grund der die Stegeinlage aufnehmenden Dehnfuge beim Abkühlen des Zylinderkopfes nach dessen Gießen zu vermeiden, hat die Stegeinlage mindestens einen Durchbruch, ein Fenster oder einen seitlichen Einschnitt. Durch diesen Durchbruch, das Fenster oder den Einschnitt hindurch ist das beiderseits der Stegeinlage befindliche Werkstoffmaterial des Zylinderkopfes miteinander unmittelbar verbunden.Cylinder head (4) for an internal combustion engine, which has at least one web insert (5) embedded in the cylinder head in the web area between the inlet and exhaust valves. In order to avoid the occurrence of hot cracks at the base of the expansion joint receiving the web insert when the cylinder head cools after it has been cast, the web insert has at least one opening, a window or a side incision. Through this opening, the window or the incision, the material material of the cylinder head located on both sides of the web insert is directly connected to one another.
Description
Die Erfindung betrifft einen Zylinderkopf für eine Brennkraftmaschine, der im zwischen den Ein- und Auslaßventilen befindlichen Stegbereich seiner den Brennraum begrenzenden Wand mindestens eine Stegeinlage hat, die aus einem Eingießteil besteht und so in diese Wand eingebettet ist, daß sie sich mit einer Hauptabmessung im wesentlichen senkrecht zu deren Oberfläche erstreckt.The invention relates to a cylinder head for an internal combustion engine, which in the web area between the intake and exhaust valves of its wall delimiting the combustion chamber has at least one web insert which consists of a pouring part and is embedded in this wall such that it essentially has a main dimension extends perpendicular to their surface.
Derartige Zylinderköpfe sind bereits bekannt. Die dort vorhandenen aus Blechen bestehenden Stegeinlagen bilden beim Eingießen in den Zylinderkopf in dessen Werkstoff Dehnfugen, die durch die Einlagen gegen Verkokung geschützt und so dauerfunktionsfähig erhalten werden sollen.Such cylinder heads are already known. The web inserts made of sheet metal there form expansion joints when pouring into the cylinder head in its material, which are protected against coking by the inserts and are thus to be maintained for long-term functionality.
Bei Zylinderköpfen, insbesondere bei luftgekühlten Zylinderköpfen aus Leichtmetall, ist vor allem deren Steg, der sich zwischen den Ventilöffnungen im Zylinderkopfboden befindet, hohen Betriebstemperaturen ausgesetzt, während die davon weiter entfernt liegenden Zonen des Zylinderkopfes wesentlich kühler bleiben. Hierdurch und durch die thermische Wechselbeanspruchung des Zylinderkopfes zwischen Betrieb und Stillstand entstehen in den hohen Betriebstemperaturen ausgesetzten Zonen, wie im vorgenannten Steg, abwechselnd Zug- und Druckspannungen, die den Werkstoff des Zylinderkopfes über die Fließgrenze hinaus beanspruchen und zu einer Rißbildung, im Bereich der Stege sogar zu einem Stegdurchriß führen können, wodurch der Zylinderkopf unbrauchbar wird.In the case of cylinder heads, in particular in air-cooled cylinder heads made of light metal, their web in particular, which is located between the valve openings in the cylinder head base, is exposed to high operating temperatures, while the zones of the cylinder head which are further away remain significantly cooler. As a result of this and due to the thermal alternating stress on the cylinder head between operation and standstill, high and low temperatures, such as in the aforementioned web, alternately produce tensile and compressive stresses that stress the material of the cylinder head beyond the yield point and lead to crack formation in the area of the webs can even lead to a web tear, making the cylinder head unusable.
Mit der Einarbeitung von durch Stegbleche ausgefüllten Dehnfugen gemäß dem oben geschilderten vorbekannten Stand der Technik hat man versucht, dies zu vermeiden. Hierdurch gelang es zwar, die Zug- und Druckspannungen von der brennraumseitigen Stegoberfläche so weit in die Tiefe des Steges und damit in kühlere Zonen des Zylinderkopfes zurückzuverlegen, wie die Dehnfugen tief sind. Dadurch wurde die Gefahr der Materialbelastung oberhalb der Fließgrenze am Dehnfugengrund zwar geringer, jedoch war die Gefahr der Rißbildung, insbesondere des Ein- und Weiterreißens im Werkstoff des Zylinderkopfes nicht restlos beseitigt. Außerdem wurde beim Gießen des Zylinderkopfes der Materialfluß durch die in den Steg des Zylinderkopfes hineinragenden Bleche empfindlich gestört und auch der Kristallisationsablauf durch die unterschiedliche Wärmeleitung von Stegblech und Werkstoff des Steges nachteilig verändert. Hierdurch war bei der Erstarrung und Abkühlung des gegossenen Zylinderkopfes wiederum die Entstehung von Warmrissen im Dehnfugengrund gegeben, die sich im Motorbetrieb zu Temperaturwechselrissen ausweiten.Attempts have been made to avoid this by incorporating expansion joints filled by web plates in accordance with the prior art described above. As a result, the tensile and compressive stresses from the web surface on the combustion chamber side were moved as far back into the depth of the web and thus into cooler zones of the cylinder head as the expansion joints are deep. As a result, the risk of material stress above the yield point at the expansion joint base was reduced, but the risk of cracking, in particular tearing and tearing in the material of the cylinder head, was not completely eliminated. In addition, when the cylinder head was cast, the material flow was severely disrupted by the metal sheets protruding into the web of the cylinder head, and the crystallization process was also adversely affected by the different heat conduction of the web sheet and the material of the web. As a result, during the solidification and cooling of the cast cylinder head, there were again hot cracks in the expansion joint base, which expand into temperature change cracks during engine operation.
Der Erfindung liegt daher die Aufgabe zugrunde, bei einem Zylinderkopf der eingangs genannten Gattung das Auftreten von Warmrissen am Grund der die Stegeinlagen aufnehmenden Dehnfugen beim Abkühlen des Zylinderkopfes nach dessen Gießen zu vermeiden, und zwar durch entsprechende Verringerung der auf den Dehnfugengrund wirkenden Schrumpfspannungen. Da durch die spätere Wärmebehandlung die beim Abkühlen nach dem Gießen entstandenen Werkstoffspannungen abgebaut werden, liegt der Erfindung insbesondere die Aufgabe zugrunde, eine Rißbildung durch Schrumpfspannungen zumindest bis zu deren Abbau durch die Wärmebehandlung zu verhindern.The invention is therefore based on the object in a cylinder head of the type mentioned to avoid the occurrence of hot cracks at the bottom of the expansion joints receiving the expansion joints when the cylinder head cools after it has been poured, by a corresponding reduction in the shrinkage stresses acting on the expansion joint base. Since the material stresses that arise during cooling after casting are reduced by the subsequent heat treatment, the invention is based, in particular, on the object of preventing cracking by shrinkage stresses, at least until they are reduced by the heat treatment.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß die Stegeinlage mindestens einen Durchbruch, ein Fenster oder einen seitlichen Einschnitt hat. Hierdurch wird eine völlige Trennung des beiderseits der Stegeinlage befindlichen Werkstoffmaterials des Zylinderkopfes vermieden, vielmehr ist das Material durch die Durchbrechung, das Fenster oder den Einschnitt hindurch zusammenhängend. Dadurch wird die Entstehung von Warmrissen im Dehnfugengrund bei der Erstarrung und Abkühlung des gegossenen Zylinderkopfes vermieden und die Ausbildung eines sonst nach der Abkühlung des Zylinderkopfes sichtbaren Schrumpfspaltes zwischen Stegeinlage und Zylinderkopfmaterial weitgehend vermindert. Damit kann die Dehnfuge die ihr zugedachte Funktion, nämlich die Umlenkung der durch Temperaturwechsel bedingten Zug- und Druckspannungen in kühlere Werkstoffbereiche des Zylinderkopfes erfüllen, ohne daß am Dehnfugengrund Anrisse entstehen. Ferner wird durch die erfindungsgemäß vorgesehene Durchbrechung, durch das Fenster oder den Einschnitt beim Gießen des Zylinderkopfes ein besserer Materialfluß erreicht, was die Bildung von verwirbelten Oxidhäuten verringert. Außerdem entsteht ein besserer Wärmefluß und dadurch ein besserer Kristallisationsablauf, wodurch Gefügemängel und Lunker vermieden werden.This object is achieved in that the web insert has at least one opening, a window or a side incision. In this way, a complete separation of the material of the cylinder head located on both sides of the web insert is avoided, rather the material is connected through the opening, the window or the incision. This prevents the formation of hot cracks in the expansion joint base during the solidification and cooling of the cast cylinder head and largely reduces the formation of a shrink gap between the web insert and the cylinder head material that is otherwise visible after the cooling of the cylinder head. The expansion joint can thus fulfill its intended function, namely the deflection of the tensile and compressive stresses caused by temperature changes into cooler material areas of the cylinder head, without cracks appearing on the base of the expansion joint. Furthermore, a better material flow is achieved through the opening provided according to the invention, through the window or the incision when casting the cylinder head, which reduces the formation of swirled oxide skins. In addition, there is a better heat flow and thus a better crystallization process, which prevents structural defects and voids.
Die Stegeinlage kann einen oder mehrere solcher Durchbrüche bzw. Fenster oder seitliche Einschnitte haben, wobei diese die verschiedensten Formen besitzen können, wie z.B. Kreisform, Langlochform, Rechteckform, quadratische Form od.dgl. Die Fläche oder die Summe der Flächen des oder der Durchbrüche bzw. Fenster oder Einschnitte sollte so dimensioniert werden, daß sie mindestens den gewünschten Teil der auf den Fugengrund wirkenden Schrumpfspannungen aufnehmen kann, wobei sie jedoch nicht größer sein sollte als die kleinste Stegquerschnittsfläche, bezogen (begrenzt) auf die Tiefe der Stegeinlage, um unter Betriebsspannungen als Sollbruchstelle zu wirken und nicht die Wirkung der Dehnfuge aufzuheben. Dabei kann es vorteilhaft sein, daß der Abstand des Mittelpunktes des oder der Durchbrüche, Fenster oder Einschnitte mindestens ein Viertel der Gesamttiefe der Stegeinlagen beträgt.The web insert can have one or more such openings or windows or side incisions, and these can have a wide variety of shapes, such as, for example, circular shape, elongated hole shape, rectangular shape, square shape or the like. The area or the sum of the areas of the openings or windows or incisions should be dimensioned such that they can absorb at least the desired part of the shrinkage stresses acting on the joint base, whereby they However, it should not be larger than the smallest cross-sectional area of the web, based (limited) on the depth of the web insert, in order to act as a predetermined breaking point under operating voltages and not to cancel out the effect of the expansion joint. It may be advantageous that the distance between the center of the openings or openings, windows or incisions is at least a quarter of the total depth of the web inserts.
Bevorzugt sollte die Gesamtfläche des oder der Durchbrüche, Fenster oder Einschnitte der Stegeinlage mindestens den Wert F besitzen, der folgender Gleichung entspricht:
F = Fläche des Durchbruches bzw. Gesamtfläche aller Durchbrüche in mm²
S = beobachtete Spaltbreite bei Köpfen ohne durchbrochenes Stegblech in mm
E = Elastizitätsmodul des Stegmaterials in N/mm²
b = Breite des Stegbleches in mm an der Stelle des Durchbruches (mittlere Breite) in mm
t₁ = Tiefe des Durchbruches, gemessen von der Endstelle des Stegbleches
t = Tiefe des gesamten Stegbleches am unbearbeiteten Kopf in mm
y = % Angabe des gewünschten Spannungsabbaues auf y%
l₀ = Abstand der Stegbleche zueinander in mm
F = area of the opening or total area of all openings in mm²
S = observed gap width in heads without perforated web plate in mm
E = modulus of elasticity of the web material in N / mm²
b = width of the web plate in mm at the point of the opening (average width) in mm
t₁ = depth of the opening, measured from the end point of the web plate
t = depth of the entire web plate on the unprocessed head in mm
y =% Specification of the desired voltage reduction to y%
l₀ = distance between the web plates in mm
Besonders vorteilhafte Ausführungsbeispiele der erfindungsgemäßen Stegeinlage sowie deren Anordnung in einem Zylinderkopf werden anhand der Zeichnung im folgenden näher beschrieben:
- Fig. 1 bis 3 zeigen diese drei Ausführungsformen in Einzeldraufsicht,
- Fig. 4 zeigt die Ausführungsform gemäß Fig. 1 in eingegossener Lage mit den in der vorstehenden Formel enthaltenen Parametern,
- Fig. 5 zeigt die Anordnung zweier Stegeinlagen gemäß der Erfindung in einem Zylinderkopf im Schnitt,.
- Fig. 6 zeigt diese Anordnung in Draufsicht auf den Boden des Zylinderkopfes.
- 1 to 3 show these three embodiments in a single plan view,
- 4 shows the embodiment according to FIG. 1 in the cast-in position with the parameters contained in the above formula,
- Fig. 5 shows the arrangement of two web inserts according to the invention in a cylinder head in section.
- Fig. 6 shows this arrangement in plan view of the bottom of the cylinder head.
Die in den Fig. 1 bis 3 gezeigten Ausführungsformen einer Stegeinlage gemäß der Erfindung besitzen gleiche Abmessungen und sind in ihrem in den Zylinderkopf einzugießenden, in den Figuren oben liegenden Bereich gewölbt. In diesem gewölbten Bereich besitzt die Einlage in der Ausführungsform gemäß Fig. 1 eine einzige fensterartige Durchbrechung 1 in Form eines Langloches, während die Ausführungsform gemäß Fig. 2 stattdessen drei fensterartige Durchbrechungen 2 in kreisrunder Form hat. Bei der Ausführungsform gemäß Fig. 3 zwei Reihen von kleineren, im Querschnitt kreisrunden lochartigen Durchbrechungen 3 vorgesehen. Alle diese Durchbrechungen gewährleisten nach dem Eingießen der Stegeinlage in den Zylinderkopf eine Verbindung des beiderseits der Stegeinlage befindlichen Werkstoffes des Zylinderkopfes, wodurch die vorstehend geschilderten Vorteile erreicht werden.The embodiments of a web insert according to the invention shown in FIGS. 1 to 3 have the same dimensions and are curved in their area to be poured into the cylinder head, which is at the top in the figures. In this curved area, the insert in the embodiment according to FIG. 1 has a single window-like opening 1 in the form of an elongated hole, while the embodiment according to FIG. 2 instead has three window-
Figur 4 veranschaulicht, daß die Stegeinlagen nur mit ihrem gewölbten, die Durchbrechung 1 enthaltenden Teil in den Zylinderkopf 1 eingegossen werden, und zwar so, daß sie sich mit ihrer Hauptabmessung im wesentlichen senkrecht zu deren Oberfläche erstreckt. Der andere Teil der Stegeinlagen bildet eine Haltelasche 10, die beim Gießen zur Fixierung der Stegeinlage in der Gießform dient. Sie wird dann vom fertigen Gußteil mit ihrer über die Gußoberfläche 11 hinausragenden Länge durch mechanische Bearbeitung abgetrennt. Fig. 4 zeigt ferner die Spaltbreite s, die sich bei Zylinderköpfen 4 mit einer darin eingegossenen Stegeinlage 5 ergeben würde, die nicht die erfindungsgemäß vorgesehenen Durchbrüche, Fenster oder Einschnitte hat.Figure 4 illustrates that the web inserts are poured into the
Fig. 5 und 6 zeigen einen Zylinderkopf, der zwei Stegeinlagen 8 hat, die an den beiden Seiten des zwischen den Ventilöffnungen 6 im Zylinderkopfboden befindlichen Steges 7 angeordnet sind.5 and 6 show a cylinder head which has two
Claims (8)
daß die Stegeinlage mindestens einen Durchbruch, ein Fenster oder einen seitlichen Einschnitt (1,2,3) hat.1. Cylinder head for an internal combustion engine, which has at least one web insert in the web area (7) between the intake and exhaust valves of the wall delimiting the combustion chamber, which web insert consists of a pouring part and is embedded in this wall in such a way that it has a main dimension in extends substantially perpendicular to the surface thereof, characterized in that
that the web insert has at least one opening, a window or a side incision (1,2,3).
F = Fläche des Durchbruches bzw. Gesamtfläche aller Durchbrüche in mm²
S = beobachtete Spaltbreite bei Köpfen ohne durchbrochenes Stegblech in mm
E = Elastizitätsmodul des Stegmaterials in N/mm²
b = Breite des Stegbleches in mm an der Stelle des Durchbruches (mittlere Breite) in mm
t₁ = Tiefe des Durchbruches, gemessen von der Endstelle des Stegbleches
t = Tiefe des gesamten Stegbleches am unbearbeiteten Kopf in mm
y = % Angabe des gewünschten Spannungsabbaues auf y%
l₀ = Abstand der Stegbleche zueinander in mm
F = area of the opening or total area of all openings in mm²
S = observed gap width in heads without perforated web plate in mm
E = modulus of elasticity of the web material in N / mm²
b = width of the web plate in mm at the point of the opening (average width) in mm
t₁ = depth of the opening, measured from the end point of the web plate
t = depth of the entire web plate on the unprocessed head in mm
y =% Specification of the desired voltage reduction to y%
l₀ = distance between the web plates in mm
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT88105551T ATE71187T1 (en) | 1987-06-25 | 1988-04-07 | CYLINDER HEAD FOR AN INTERNAL ENGINE. |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3721029 | 1987-06-25 | ||
| DE19873721029 DE3721029A1 (en) | 1987-06-25 | 1987-06-25 | CYLINDER HEAD FOR AN INTERNAL COMBUSTION ENGINE |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0296320A2 true EP0296320A2 (en) | 1988-12-28 |
| EP0296320A3 EP0296320A3 (en) | 1989-11-29 |
| EP0296320B1 EP0296320B1 (en) | 1992-01-02 |
Family
ID=6330294
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP88105551A Expired - Lifetime EP0296320B1 (en) | 1987-06-25 | 1988-04-07 | Cylinder head for an internal combustion engine |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US4854275A (en) |
| EP (1) | EP0296320B1 (en) |
| AT (1) | ATE71187T1 (en) |
| DE (2) | DE3721029A1 (en) |
| ES (1) | ES2027721T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017082846A1 (en) | 2015-11-11 | 2017-05-18 | Ford Otomotiv Sanayi A. S. | Multi-piece cylinder head |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3837254A1 (en) * | 1988-11-03 | 1990-05-10 | Bayerische Motoren Werke Ag | Light alloy insert for the formation of an expansion joint in combustion chamber walls of internal combustion engines formed from cast light alloy, especially cylinder head bases of diesel internal combustion engines |
| DE102018007546A1 (en) * | 2018-09-25 | 2020-03-26 | Rheinisch-Westfälische Technische Hochschule (Rwth) Aachen | Process for producing a hybrid component |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1294093B (en) * | 1967-10-25 | 1969-04-30 | Kloeckner Humboldt Deutz Ag | Cylinder head for internal combustion engines |
| DE2904940A1 (en) * | 1979-02-09 | 1980-08-21 | Kloeckner Humboldt Deutz Ag | LIGHT METAL CYLINDER HEAD FOR A VALVE CONTROLLED INTERNAL COMBUSTION ENGINE |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1734875U (en) * | 1955-02-12 | 1956-11-29 | Daimler Benz Ag | CYLINDER HEAD. |
| DE3034591C2 (en) * | 1980-09-13 | 1985-10-03 | Klöckner-Humboldt-Deutz AG, 5000 Köln | Light metal cylinder head for a valve-controlled internal combustion engine |
-
1987
- 1987-06-25 DE DE19873721029 patent/DE3721029A1/en active Granted
-
1988
- 1988-04-07 ES ES198888105551T patent/ES2027721T3/en not_active Expired - Lifetime
- 1988-04-07 DE DE8888105551T patent/DE3867331D1/en not_active Expired - Lifetime
- 1988-04-07 AT AT88105551T patent/ATE71187T1/en not_active IP Right Cessation
- 1988-04-07 EP EP88105551A patent/EP0296320B1/en not_active Expired - Lifetime
- 1988-06-20 US US07/209,051 patent/US4854275A/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1294093B (en) * | 1967-10-25 | 1969-04-30 | Kloeckner Humboldt Deutz Ag | Cylinder head for internal combustion engines |
| DE2904940A1 (en) * | 1979-02-09 | 1980-08-21 | Kloeckner Humboldt Deutz Ag | LIGHT METAL CYLINDER HEAD FOR A VALVE CONTROLLED INTERNAL COMBUSTION ENGINE |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017082846A1 (en) | 2015-11-11 | 2017-05-18 | Ford Otomotiv Sanayi A. S. | Multi-piece cylinder head |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3721029C2 (en) | 1989-09-21 |
| EP0296320B1 (en) | 1992-01-02 |
| US4854275A (en) | 1989-08-08 |
| EP0296320A3 (en) | 1989-11-29 |
| DE3867331D1 (en) | 1992-02-13 |
| ES2027721T3 (en) | 1992-06-16 |
| ATE71187T1 (en) | 1992-01-15 |
| DE3721029A1 (en) | 1989-01-05 |
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