EP2429739A1 - Procede de fabrication par coulee d'une culasse de moteur thermique - Google Patents
Procede de fabrication par coulee d'une culasse de moteur thermiqueInfo
- Publication number
- EP2429739A1 EP2429739A1 EP10727038A EP10727038A EP2429739A1 EP 2429739 A1 EP2429739 A1 EP 2429739A1 EP 10727038 A EP10727038 A EP 10727038A EP 10727038 A EP10727038 A EP 10727038A EP 2429739 A1 EP2429739 A1 EP 2429739A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cores
- core
- cylinder head
- housing
- casting
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
- B22C9/103—Multipart cores
Definitions
- the present invention relates to a method of manufacturing, by metal casting, a cylinder head of a heat engine.
- the cylinder head of a heat engine is a complex piece, cast iron or aluminum, most often comprising the intake ducts, the exhaust ducts and water chambers in which can circulate a cooling fluid (coolant).
- the cylinder heads are subjected to high mechanical and thermal stresses. They are therefore carefully cooled by large heat transfer fluid chambers (called water chambers) which must be surrounded as close as possible to the combustion chambers and the exhaust ducts.
- the circulation of the coolant (hereinafter referred to as "water” for simplicity) must be defined to provide the best possible cooling closer to the combustion chambers.
- water heat transfer fluid chambers
- the raw yoke is obtained in a foundry, generally according to the so-called "shell gravity casting” process, by casting metal (cast iron or aluminum) in a mold composed of a metal frame and an assembly of sand cores. The molten metal fills the spaces left free between the metal frame and the various sand cores.
- Figure 1 shows a portion 10 of the water core, an exhaust core 12 and an intake core 14.
- the exhaust 12 and intake 14 cores are placed in housing respectively 16 and 18.
- the cores are sand.
- the hole 20 is intended to be filled with metal in which a housing for a glow plug (the example described for a diesel engine cylinder head).
- the complete water core 22 is shown in Figure 4.
- the core comprises the housing 16 and 18 respectively exhaust ducts 12 and 14 admission.
- the holes 24 will be, at the time of casting, filled with metal that will be by the subsequently drilled to form injector wells.
- Holes 26 prefigure the locations for the bolts of bolt.
- the protuberances 28 are staves of nuclei whose function is to prevent the water core from rising during the casting of the metal in the mold.
- the heat transfer fluid (for simplicity will be designated later by this fluid by water) arrives in the cylinder head according to the arrow 30, circulates in the cylinder head (and thus in the water core 22) in the direction of the arrow 32 and comes out of the bolt as indicated by the arrow 34.
- the exhaust cores 12 and 14 are inserted in the housing respectively 16 and 18. These cores are mainly sand and therefore relatively fragile. As indicated above, it is important that the cores 12 and 14 are not deformed, especially that their outer diameter is not decreased, These dishes will be an obstacle to the flow of exhaust gas. This results in a decrease in the air flow.
- Figures 5 and 6 respectively show a top view of the water core ( Figure 5) and a side view ( Figure 6 - section along A of Figure 5). These Figures 5 and 6 illustrate a case where it was necessary to make a plate 46 on the intake duct 48, and thus to deform, so as to allow sufficient water circulation to obtain a proper cooling of the injector whose location is shown by the hole 50.
- the metal part of the cylinder head is indicated by the 54.
- the plate 46 allows sufficient circulation of water through the passage 52, but at the expense of the air flow in the intake duct.
- the present invention relates to a method which does not have, or attenuated, at least one of the disadvantages of the prior art.
- the invention relates to a method of manufacturing by casting a heat engine cylinder cooled by a coolant, wherein the cores are placed in a mold, including a water core comprising housing for receive conduit cores.
- the water core is made in two cores, a lower core and an upper core, said conduit cores being molded into said lower core housings, the upper core then being molded onto the lower core and the conduit cores .
- conduit cores are remmoulés from top to bottom, substantially vertically, in said housing;
- each of said lower and upper cores comprises a portion of each of said housing, preferably a half of one of said housing.
- the separation between the lower and upper cores creates at the time of casting a rib that enhances the mechanical rigidity of the cylinder head.
- bores are drilled in the lower and upper cores so as to provide passages for the circulation of heat transfer fluid between the lower and upper parts of the cylinder head.
- the characteristics of said bores are sized so that the passages allow the flow of coolant desired between the lower and upper parts of the cylinder head. Sizing means the number of holes, their distribution and their diameters.
- the conduits of said conduit cores intended to be placed in said housing are ducts which undergo a high temperature rise, for example the exhaust ducts.
- FIGS. 1 to 6 illustrate the prior art and its disadvantages
- FIGS. 7 and 8 illustrate the method according to the invention
- FIGS. 9 and 10 show an advantage of the invention, namely the possibility of obtaining a rib for reinforcing the cylinder head.
- the water core 61 consists of a lower water core 60 and an upper water core 62 ( Figure 7), the two lower and upper cores can be imagined as the result of cutting the core.
- water 22 of Figure 4 in two parts in the longitudinal direction.
- the lower and upper cores each comprise a portion 64 of the housings 68 for the lower nucleus and a portion 66 for the upper nucleus of the exhaust nuclei 12.
- the division of the water nucleus into two parts makes it possible to remold (that is to say Precisely assembling, just prior to the casting of metal) easily the conduit cores which, according to the method of the prior art, were threaded into the housing which sometimes led to deformations of the cores and / or said housing.
- the upper core comprises, as in the case of Figure 4, housing 18 ( Figure 8) for the inlet cores.
- Figure 8 shows the two upper and lower 62 cores 60, the latter comprising the portion 64 of the housing 68 of conduits, the other portion 66 of the housing 68 being formed in the upper core 62.
- the lower core 60 is first deposited in the mold, then the exhaust cores 12 are remouloulés in the parts 64 of the housing 68.
- the upper core 62 is then molded on the lower core 60 and the cores 12, the parts 66 to cap the exhaust cores 12.
- the intake cores 14 are then remmoulés in their housing 18.
- the exhaust cores 12 are thus placed by performing a movement from top to bottom, preferably vertically.
- each of the parts 64 of these housing 16 is preferably half of a housing of these cores (like a half-shell), the another half being formed by the other portion 66 of the upper core.
- the invention makes it possible to shape the shape of the housings 68 in the desired manner so that the water circulates as close as possible to the hot parts of the cylinder head, as well as closer to the injectors and the valve seats, and to limit the thicknesses of metal around the ducts.
- the invention also makes it possible to avoid deformation of the cores of the ducts and therefore deformation of these ducts and the flow constraints in these ducts generated by said deformations.
- the water cores 60 and 62 are removed, thus forming lower and upper hollow portions in which the water circulates.
- the circulation of water in the cylinder head is represented in FIG. 7 by arrows.
- the circulation of water between the lower part and the upper part is represented by the vertical arrows and is provided by holes 70 in the lower and upper 60 and 62 cores (FIG. 7).
- the number, the distribution and the diameter of these different holes or passages allows to control the flow of water passing from the lower part to the upper part, post to position, and thus allows a more homogeneous cooling of the cylinder head.
- Another advantage of the present invention is to obtain a strengthening of the rigidity of the cylinder head through the formation of a thin layer of metal (a "rib” or “fabric") separating the two lower and upper parts of the breech.
- This reinforcement rib approximately 5 mm thick, is illustrated in FIGS. 9 and 10 which represent two different sections of the yoke.
- the lower water nuclei 80 and upper 82 are separated by a rib ⁇
- the bore 86 or passage between the lower part and the upper part of the cylinder head is closed by a sealing ball 88.
- the wells 90 and 92 are passages for the bolts for fixing the cylinder head.
- the lower core 80 and the upper core 82 surround a housing 94 for receiving an exhaust duct.
- the reinforcing rib 84 extends over the entire length of the bolt. This rib brings a gain in terms of mechanical strength but also in terms of acoustic performance.
- the method of the invention optimizes the cooling of the tablature of the cylinder head (part of the cylinder head that caps the crankcase), to homogenize the cooling the breech; to remool more easily, optimize fluid flow rates in the ducts, optimize the thickness and mass of the cylinder head and finally strengthen the cylinder head by the formation of a rib.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0953209A FR2945463B1 (fr) | 2009-05-14 | 2009-05-14 | Procede de fabrication par coulee d'une culasse de moteur thermique |
PCT/FR2010/050789 WO2010130911A1 (fr) | 2009-05-14 | 2010-04-26 | Procede de fabrication par coulee d'une culasse de moteur thermique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2429739A1 true EP2429739A1 (fr) | 2012-03-21 |
Family
ID=41171295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP10727038A Withdrawn EP2429739A1 (fr) | 2009-05-14 | 2010-04-26 | Procede de fabrication par coulee d'une culasse de moteur thermique |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP2429739A1 (fr) |
FR (1) | FR2945463B1 (fr) |
WO (1) | WO2010130911A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102012106082A1 (de) * | 2012-07-06 | 2014-01-09 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Vorrichtung und Verfahren zum Fertigen eines Gussteils |
DE102018128020B4 (de) * | 2018-11-09 | 2024-05-23 | Bayerische Motoren Werke Aktiengesellschaft | Kokille sowie Verfahren zum Herstellen eines Kurbelgehäuses |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2820267A (en) * | 1953-12-17 | 1958-01-21 | Gen Motors Corp | Cylinder head coring |
US2858587A (en) * | 1954-12-20 | 1958-11-04 | Gen Motors Corp | Cylinder head coring for overhead valve engines |
GB789858A (en) * | 1956-04-11 | 1958-01-29 | Gen Motors Corp | Improvements in and relating to casting cylinder heads for internal combustion engines |
JP4329774B2 (ja) * | 2006-03-15 | 2009-09-09 | トヨタ自動車株式会社 | シリンダヘッドの製造方法およびシリンダヘッド |
-
2009
- 2009-05-14 FR FR0953209A patent/FR2945463B1/fr not_active Expired - Fee Related
-
2010
- 2010-04-26 WO PCT/FR2010/050789 patent/WO2010130911A1/fr active Application Filing
- 2010-04-26 EP EP10727038A patent/EP2429739A1/fr not_active Withdrawn
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2010130911A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2945463A1 (fr) | 2010-11-19 |
FR2945463B1 (fr) | 2014-11-21 |
WO2010130911A1 (fr) | 2010-11-18 |
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17Q | First examination report despatched |
Effective date: 20160614 |
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RAP1 | Party data changed (applicant data changed or rights of an application transferred) |
Owner name: PSA AUTOMOBILES SA |
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