EP0339453B1 - Cast cylinder head for an internal combustion engine - Google Patents
Cast cylinder head for an internal combustion engine Download PDFInfo
- Publication number
- EP0339453B1 EP0339453B1 EP89107002A EP89107002A EP0339453B1 EP 0339453 B1 EP0339453 B1 EP 0339453B1 EP 89107002 A EP89107002 A EP 89107002A EP 89107002 A EP89107002 A EP 89107002A EP 0339453 B1 EP0339453 B1 EP 0339453B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder head
- insert
- internal combustion
- head according
- inlet
- 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 - Lifetime
Links
- 238000002485 combustion reaction Methods 0.000 title claims description 11
- 230000002349 favourable effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000007769 metal material Substances 0.000 claims description 3
- 229910010293 ceramic material Inorganic materials 0.000 claims 1
- 239000007789 gas Substances 0.000 description 10
- 239000002184 metal Substances 0.000 description 6
- 238000005266 casting Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000009413 insulation Methods 0.000 description 4
- 238000004512 die casting Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000001746 injection moulding Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 238000005058 metal casting Methods 0.000 description 1
- 238000012958 reprocessing Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 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
- F02F1/36—Cylinder heads having cooling means for liquid cooling
- F02F1/38—Cylinder heads having cooling means for liquid cooling the cylinder heads being of overhead valve type
-
- 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
- F02F2001/247—Arrangement of valve stems in cylinder heads the valve stems being orientated in parallel with the cylinder axis
-
- 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
- F02F2200/00—Manufacturing
- F02F2200/06—Casting
Definitions
- the invention relates to a cast cylinder head for internal combustion engines according to the preamble of claim 1.
- the cylinder heads of internal combustion engines are usually produced using a light metal casting process using sand cores.
- the production of the sand cores, their removal after the casting process has ended and their reprocessing can sometimes be problematic, also from the point of view of environmental protection.
- casting defects due to sand inclusions or the like can occur in the case of defective sand cores, in particular if the sand cores have a very complicated shape with very thin-walled webs.
- the object on which the invention is based is therefore to provide a cylinder head which is also suitable for injection molding or die casting and which provides the prerequisites for a flow which is as loss-free as possible, in particular in the inlet region which is particularly sensitive to flow losses.
- Sheet metal inserts are already known per se for installation in gas exchange ducts of cylinder heads. However, these known inserts have so far generally served to achieve thermal insulation of the gas flow. They were therefore predominantly used in the exhaust ducts of internal combustion engines (DE-A-2602434 shows an insert cast in the intake duct).
- the inserts according to the invention can also bring about such thermal insulation, for which purpose the outer walls of the inserts can be held at least in a central region with a space forming a cavity relative to the inner wall of the recess and the cavities thus formed can be filled with a material with low heat conduction.
- the first and most important task of the inserts according to the invention is to be seen in creating a channel shape that is as favorable as possible with regard to the flow pattern.
- the drawing shows the outline of a cylinder head, which is partially cut at the center line of an intake port.
- the cylinder head is generally designated 1, which here has at least two parts, namely a lower part 2a and an upper part 2b. 3 with a part of a combustion chamber of a cylinder lying in the cylinder head 1 is designated, while 4 represents a seat ring against which an inlet valve, not shown in the drawing, bears with its valve disk.
- a dome-like space 5 is provided above the seat ring 4, into which an inlet channel 6 opens.
- the inlet duct 6 is essentially formed by an insert 8 which is formed from a sheet metal hollow body and is held in a recess 7 of the cylinder head.
- the front end 10 of this insert 8 is supported on a shoulder 13 of a valve stem guide 12, while the rear end 11, if appropriate after a corresponding widening, bears against the mouth of the recess 7 on the cylinder head end face 17.
- the insert 8 is shaped so that there is a flow-favorable course of the inlet channel 6.
- the sheet metal hollow body representing insert 8 forms a cavity 9 opposite recess 7 of cylinder head housings 2a and 2b, which is possibly filled with a material with low heat conduction for the purpose of stabilizing insert 8.
- This insulation material can be installed after the Insert are injected into the recess 7 through the holes 14 and 15, wherein it fills the cavity after injection by foaming.
- the streamlined form of the insert can be produced by compression molding the tubular base body, which is preferably made of sheet metal material, but may also be made of ceramic. This insert 8 can then also cover any existing sharp cast edges which arise in the region of the transition of the recesses provided for the gas exchange channels into the recesses for the combustion chamber 3 and the dome-like space 5 above the seat ring 4. These recesses are created by separate drawing cores, which are pulled off in different directions after the casting.
- the cylinder head in the region of the valve stem guide 12 is divided by a parting line 16 and the ceiling region of the recess 7 for the inlet duct 6 is formed by the upper cylinder head part 2b.
- the division of the cylinder head can also be performed such that the cover part of the inlet channel recess 7 is also part of the lower cylinder head part 2a.
- the channel design is shown with the aid of a tubular sheet metal insert 8 using the example of the inlet channel.
- this design can also be carried out with an outlet duct.
- the sheet metal material would have to be made of a highly heat-resistant steel material, and in the space between the insert and the housing recess, the cavity would either have to remain empty or be filled with a refractory insulating material.
- the use of such a sheet metal insert on the outlet side is not absolutely necessary, at least for reasons of streamlined gas flow, at least not to the same extent as on the inlet side, since flow losses on the outlet side have a significantly less influence on the performance of the internal combustion engine take like the losses on the inlet side. For this reason, the inserts on the exhaust side could also be omitted, unless they were essential for the already known purpose of thermal insulation of the cylinder head.
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
Die Erfindung bezieht sich auf einen gegossenen Zylinderkopf für Brennkraftmaschinen gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a cast cylinder head for internal combustion engines according to the preamble of claim 1.
Üblicherweise erfolgt die Herstellung der Zylinderköpfe von Brennkraftmaschinen im Leichtmetall-Gießverfahren unter Verwendung von Sandkernen. Die Herstellung der Sandkerne, deren Entfernung nach Beendigung des Gießverfahrens und ihre Wiederaufarbeitung ist jedoch mitunter problematisch, auch unter dem Gesichtspunkt des Umweltschutzes. Darüber hinaus können bei fehlerhaften Sandkernen Gußfehler durch Sandeinschlüsse oder dgl. insbesondere dann entstehen, wenn die Sandkerne eine sehr komplizierte Form mit sehr dünnwandigen Stegen aufweisen.The cylinder heads of internal combustion engines are usually produced using a light metal casting process using sand cores. However, the production of the sand cores, their removal after the casting process has ended and their reprocessing can sometimes be problematic, also from the point of view of environmental protection. In addition, casting defects due to sand inclusions or the like can occur in the case of defective sand cores, in particular if the sand cores have a very complicated shape with very thin-walled webs.
Es ist zwar auch schon bekannt (DE-OS 2028989), bei der Herstellung der Zylinderköpfe von Brennkraftmaschinen Spritz- oder Druckgußverfahren einzusetzen, bei denen die die Gaswechselkanäle und die Brennräume bildenden Ausnehmungen des Zylinderkopfes durch Ziehkerne gebildet werden. Durch die für solche Ziehkerne bestehenden Restriktionen entstehen jedoch Kanalformen, die vom strömungstechnischen Standpunkt aus nicht optimal gestaltet sind. Auch bilden sich im Übergangsbereich zwischen aneinander anschließenden Kernen scharfe Kanten, die die Strömung der Gase, stark stören können.It is also known (DE-OS 2028989) to use injection or die casting methods in the manufacture of the cylinder heads of internal combustion engines, in which the recesses of the cylinder head forming the gas exchange channels and the combustion chambers are formed by drawing cores. The restrictions existing for such drawing cores, however, result in channel shapes which are not optimally designed from a fluidic point of view. Also, sharp edges are formed in the transition area between adjoining cores, which can strongly disrupt the flow of the gases.
Die der Erfindung zugrundeliegende Aufgabe besteht daher darin, einen auch für Spritz oder Druckguß geeigneten Zylinderkopf der im Oberbegriff des Patentanspruchs genannten Art zu schaffen, der die Voraussetzungen für eine möglichst verlustarme Strömung insbesondere in dem für Strömungsverluste besonders empfindlichen Einlaßbereich, bietet.The object on which the invention is based is therefore to provide a cylinder head which is also suitable for injection molding or die casting and which provides the prerequisites for a flow which is as loss-free as possible, in particular in the inlet region which is particularly sensitive to flow losses.
Die Lösung dieser Aufgabe ergibt sich gemäß dem Kennzeichen des Patentanspruchs 1. Erfindungsgemäß lassen sich also die durch die Verwendung von Ziehkernen entstehenden Nachteile im Hinblick auf eine strömungsgünstige Form der Gaswechselkanäle, insbesondere im Einlaßbereich, durch Einbau von rohrartigen Einsätzen beheben. Diese zweckmäßigerweise durch formgepreßte Blech- oder Keramikhohlkörper gebildeten Einsätze können dann eine den Strömungsbedingungen der Gase besser angepaßte Kanalkontur ausbilden und gleichzeitig weitere Funktionen ausfüllen.This object is achieved according to the characterizing part of patent claim 1. According to the invention, the disadvantages arising from the use of drawing cores with regard to a streamlined shape of the gas exchange channels, in particular in the inlet area, can be eliminated by installing tubular inserts. These inserts, which are expediently formed by compression-molded sheet metal or ceramic hollow bodies, can then form a channel contour which is better adapted to the flow conditions of the gases and, at the same time, fulfill further functions.
Blecheinsätze sind zwar für den Einbau in Gaswechselkanälen von Zylinderköpfen an sich schon bekannt. Diese bekannten Einsätze dienten aber bisher im allgemeinen dazu, eine Wärmeisolierung der Gasströmung zu erreichen. Sie wurden daher überwiegend in den Auslaßkanälen von Brennkraftmaschinen verwendet (einen im Einlaßkanal eingegossenen Einsatz zeigt die Schrift DE-A-2602434). Eine solche Wärmeisolierung können die erfindungsgemäßen Einsätze zwar auch bewirken, wozu die Außenwände der Einsätze zumindest in einem mittleren Bereich mit einem einen Hohlraum bildenden Abstand gegenüber der Innenwand der Ausnehmung gehalten und die so gebildeten Hohlräume mit einem Material mit geringer Wärmeleitung ausgefüllt sein können. Erste und wichtigste Aufgabe der Einsätze nach der Erfindung ist aber darin zu sehen, eine im Hinblick auf den Strömungsverlauf möglichst günstige Kanalform zu schaffen. Insbesondere gilt dies für den Einlaßkanal, bei dem durch ungünstige Strömungsverhältnisse Füllungs- und damit Leistungsverluste der Brennkraftmaschine entstehen können. Neben einer strömungstechnisch günstigen Ausgestaltung der Gaswechselkanäle und der durch die Einsätze erreichbaren Wärmeisolierung, die bei den Einlaßkanälen für eine günstige Füllung infolge kühler Ansaugluft und bei den Auslaßkanälen für eine Reduzierung der Temperaturbelastung des Zylinderkopfes durch die heißen Abgase sorgt, wird durch die erfindungsgemäße Ausgestaltung des Zylinderkopfes infolge des Verzichts auf Verwendung von Sandkernen deren problematische Herstellung und Beseitigung umgangen. Darüber hinaus können Versetzungen und Toleranzen sowie Gußfehler, die angesichts der sehr komplizierten Sandkerne entstehen können, weitgehend vermieden und durch die Herstellung der Zylinderköpfe im Spritz- oder Druckgußverfahren eine weitgehend automatisierte Herstellung bei günstigen Gußstrukturen möglich.Sheet metal inserts are already known per se for installation in gas exchange ducts of cylinder heads. However, these known inserts have so far generally served to achieve thermal insulation of the gas flow. They were therefore predominantly used in the exhaust ducts of internal combustion engines (DE-A-2602434 shows an insert cast in the intake duct). The inserts according to the invention can also bring about such thermal insulation, for which purpose the outer walls of the inserts can be held at least in a central region with a space forming a cavity relative to the inner wall of the recess and the cavities thus formed can be filled with a material with low heat conduction. The first and most important task of the inserts according to the invention is to be seen in creating a channel shape that is as favorable as possible with regard to the flow pattern. This applies in particular to the inlet duct, in which filling and thus power losses of the internal combustion engine can occur due to unfavorable flow conditions. In addition to a fluidically favorable design of the gas exchange channels and the heat insulation achievable through the inserts, which in the inlet channels for a favorable filling due to cooler Intake air and in the exhaust ports for a reduction in the temperature load of the cylinder head caused by the hot exhaust gases is avoided by the inventive design of the cylinder head due to the omission of the use of sand cores whose problematic manufacture and elimination. In addition, dislocations and tolerances as well as casting errors, which can arise in view of the very complicated sand cores, can be largely avoided and largely automated production with inexpensive casting structures is possible through the production of the cylinder heads in the injection molding or die casting process.
In der Zeichnung ist ein Ausführungsbeispiel der Erfindung dargestellt, das im folgenden näher erläutert wird. Die Zeichnung zeigt die Umrisse eines Zylinderkopfes, der teilweise in Höhe der Mittellinie eines Einlaßkanals geschnitten ist. Dabei ist der Zylinderkopf insgesamt mit 1 bezeichnet, der hier zumindest zwei Teile, nämlich ein Unterteil 2a und ein Oberteil 2b aufweist. Mit 3 ist ein im Zylinderkopf 1 liegender Teil eines Brennraums eines Zylinders bezeichnet, während 4 einen Sitzring darstellt, an dem ein in der Zeichnung nicht gezeigtes Einlaßventil mit seinem Ventilteller anliegt. Oberhalb des Sitzringes 4 ist ein domartiger Raum 5 vorgesehen, in den ein Einlaßkanal 6 einmündet. Der Einlaßkanal 6 wird dabei im wesentlichen durch einen aus einem Blech-Hohlkörper geformten Einsatz 8 gebildet, der in einer Ausnehmung 7 des Zylinderkopfes gehalten ist. Dazu stützt sich das vordere Ende 10 dieses Einsatzes 8 an einer Schulter 13 einer Ventilschaftführung 12 ab, während das hintere Ende 11 gegebenenfalls nach einer entsprechenden Aufweitung, an der Mündung der Ausnehmung 7 an der Zylinderkopf-Stirnfläche 17 anliegt. Der Einsatz 8 ist dabei so geformt, daß sich ein strömungsmäßig günstiger Verlauf des Einlaßkanals 6 ergibt. Zumindest in seinem mittleren Bereich bildet dabei der den Einsatz 8 darstellende Blechhohlkörper gegenüber der Ausnehmung 7 der Zylinderkopfgehäuse 2a bzw. 2b einen Hohlraum 9, der gegebenenfalls zwecks Stabilisierung des Einsatzes 8 mit einem Material mit geringer Wärmeleitung gefüllt ist. Diese Dämmaterial kann nach dem Einbau des Einsatzes in die Ausnehmung 7 über die Bohrungen 14 und 15 eingespritzt werden, wobei es nach dem Einspritzen durch Ausschäumen den Hohlraum ausfüllt.In the drawing, an embodiment of the invention is shown, which is explained in more detail below. The drawing shows the outline of a cylinder head, which is partially cut at the center line of an intake port. The cylinder head is generally designated 1, which here has at least two parts, namely a
Während die Ausnehmung 7 für den Einlaßkanal 6 ebenso wie diejenige für den hier nicht gezeigten Auslaßkanal infolge der Verwendung von Ziehkernen eine im wesentlichen konische Kontur aufweisen, die jedenfalls für die Einlaßseite ungünstige, verlustbehaftete Strömungsverhältnisse verursachen würden, bewirkt der Einbau des Einsatzes 8 einen strömungsgünstigen Kanalverlauf. Dabei kann die strömungsgünstige Form des Einsatzes durch Formpressen des vorzugsweise aus Blechmaterial gegebenenfalls aber auch aus Keramik bestehenden rohrförmigen Grundkörpers erzeugt werden. Dieser Einsatz 8 kann dann auch etwa vorhandene scharfe Gußkanten überdecken, die im Bereich des Überganges der für die Gaswechselkanäle vorgesehenen Ausnehmungen in die Ausnehmungen für den Brennraum 3 und den domartigen Raum 5 über dem Sitzring 4 entstehen. Diese Ausnehmungen entstehen dabei jeweils durch getrennte Ziehkerne, die nach dem Abguß nach verschiedenen Richtungen hin abgezogen werden.While the recess 7 for the inlet channel 6 as well as that for the outlet channel (not shown here) have an essentially conical contour due to the use of drawing cores, which would in any case cause unfavorable, lossy flow conditions for the inlet side, the installation of the insert 8 brings about a flow-favorable channel profile . The streamlined form of the insert can be produced by compression molding the tubular base body, which is preferably made of sheet metal material, but may also be made of ceramic. This insert 8 can then also cover any existing sharp cast edges which arise in the region of the transition of the recesses provided for the gas exchange channels into the recesses for the combustion chamber 3 and the dome-like space 5 above the seat ring 4. These recesses are created by separate drawing cores, which are pulled off in different directions after the casting.
Bei der in der Zeichnung gezeigten Ausführung ist im übrigen der Zylinderkopf im Bereich der Ventilschaftführung 12 durch eine Teilfuge 16 geteilt und der Deckenbereich der Ausnehmung 7 für den Einlaßkanal 6 wird von dem oberen Zylinderkopfteil 2b gebildet. Selbstverständlich kann jedoch die Teilung des Zylinderkopfes auch so geführt sein, daß das Deckenteil der Einlaßkanal-Ausnehmung 7 auch noch Teil des Zylinderkopfunterteils 2a ist.In the embodiment shown in the drawing, moreover, the cylinder head in the region of the
In der Zeichnung ist die Kanalgestaltung mit Hilfe eines rohrförmigen Blech-Einsatzes 8 am Beispiel des Einlaßkanals dargestellt. Selbstverständlich kann diese Gestaltung auch bei einem Auslaßkanal vorgenommen sein. In diesem Fall müßte allerdings das Blechmaterial aus einem hochwärmebeständigen Stahlwerkstoff bestehen und in dem Zwischenraum zwischen dem Einsatz und der Gehäuseausnehmung müßte der Hohlraum entweder leer bleiben oder mit einem feuerfesten Dämmaterial ausgefüllt sein. Es sei jedoch besonders darauf hingewiesen, daß die Verwendung eines derartigen Blecheinsatzes auf der Auslaßseite jedenfalls aus Gründen der strömungsgünstigen Gasführung nicht unbedingt erforderlich ist, jedenfalls nicht in dem Maße wie auf der Einlaßseite, da Strömungsverluste auf der Auslaßseite wesentlich weniger stark auf die Leistung der Brennkraftmaschine Einfluß nehmen wie die Verluste auf der Einlaßseite. Aus diesem Grunde könnten auf der Auslaßseite die Einsätze auch entfallen, es sei denn diese würden wesentlich zu dem bereits bekannten Zweck der Wärmeisolierung des Zylinderkopfes benötigt.In the drawing, the channel design is shown with the aid of a tubular sheet metal insert 8 using the example of the inlet channel. Of course, this design can also be carried out with an outlet duct. In this case, however, the sheet metal material would have to be made of a highly heat-resistant steel material, and in the space between the insert and the housing recess, the cavity would either have to remain empty or be filled with a refractory insulating material. It However, it should be particularly pointed out that the use of such a sheet metal insert on the outlet side is not absolutely necessary, at least for reasons of streamlined gas flow, at least not to the same extent as on the inlet side, since flow losses on the outlet side have a significantly less influence on the performance of the internal combustion engine take like the losses on the inlet side. For this reason, the inserts on the exhaust side could also be omitted, unless they were essential for the already known purpose of thermal insulation of the cylinder head.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3814524 | 1988-04-29 | ||
| DE3814524 | 1988-04-29 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0339453A2 EP0339453A2 (en) | 1989-11-02 |
| EP0339453A3 EP0339453A3 (en) | 1990-02-28 |
| EP0339453B1 true EP0339453B1 (en) | 1991-11-21 |
Family
ID=6353194
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP89107002A Expired - Lifetime EP0339453B1 (en) | 1988-04-29 | 1989-04-19 | Cast cylinder head for an internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0339453B1 (en) |
| DE (1) | DE58900468D1 (en) |
| ES (1) | ES2029095T3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008039208A1 (en) | 2008-08-20 | 2009-02-12 | Heppes, Frank, Dipl.-Ing. | Core for use in prototyping, especially for pressure casting or powder metallurgy, is obtained using metal sheath, molding material, mechanical shaping device and high pressure compression tube |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5197189A (en) * | 1990-09-06 | 1993-03-30 | Volkswagen Ag | Method of making a cylinder head with a port liner |
| DE10029508B4 (en) * | 2000-06-21 | 2008-11-20 | Iav Gmbh Ingenieurgesellschaft Auto Und Verkehr | Channel unit for the change of charge of piston engines and method for their production |
| ITBS20020088A1 (en) * | 2002-10-04 | 2004-04-05 | Meccanica Bassi Spa | MELTING PROCEDURE, IN PARTICULAR FOR ENGINE CYLINDER HEAD |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1235034A (en) * | 1969-08-07 | 1971-06-09 | Ford Motor Co | Internal combustion engines |
| JPS51126409A (en) * | 1975-04-25 | 1976-11-04 | Nissan Motor Co Ltd | Cylinder head of automotive engine |
| DE2602434A1 (en) * | 1976-01-23 | 1977-07-28 | Daimler Benz Ag | Sheet metal lining for engine inlet and exhaust ducts - is preformed as two half shells and inserted in mould when casting cylinder head |
| US4604779A (en) * | 1984-02-27 | 1986-08-12 | Ngk Spark Plug Co., Ltd. | Method of producing a cylinder head with a port liner |
-
1989
- 1989-04-19 DE DE8989107002T patent/DE58900468D1/en not_active Expired - Lifetime
- 1989-04-19 EP EP89107002A patent/EP0339453B1/en not_active Expired - Lifetime
- 1989-04-19 ES ES198989107002T patent/ES2029095T3/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102008039208A1 (en) | 2008-08-20 | 2009-02-12 | Heppes, Frank, Dipl.-Ing. | Core for use in prototyping, especially for pressure casting or powder metallurgy, is obtained using metal sheath, molding material, mechanical shaping device and high pressure compression tube |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0339453A3 (en) | 1990-02-28 |
| DE58900468D1 (en) | 1992-01-02 |
| ES2029095T3 (en) | 1992-07-16 |
| EP0339453A2 (en) | 1989-11-02 |
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