EP2102478A1 - Culasse de moteur a combustion interne - Google Patents
Culasse de moteur a combustion interneInfo
- Publication number
- EP2102478A1 EP2102478A1 EP07847792A EP07847792A EP2102478A1 EP 2102478 A1 EP2102478 A1 EP 2102478A1 EP 07847792 A EP07847792 A EP 07847792A EP 07847792 A EP07847792 A EP 07847792A EP 2102478 A1 EP2102478 A1 EP 2102478A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinder head
- passage
- oil
- tube
- head according
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M5/00—Heating, cooling, or controlling temperature of lubricant; Lubrication means facilitating engine starting
- F01M5/002—Cooling
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
- F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
- F01M11/02—Arrangements of lubricant conduits
-
- 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
Definitions
- the present invention relates to an internal combustion engine cylinder head comprising a lubricating oil circuit, this circuit comprising at least one passage for the gravity-lowering of the oil towards a cylinder block associated with the cylinder head in the engine, this passage comprising at least one inner wall portion disposed in heat transfer relationship with a hot spot the cylinder head.
- the body of an internal combustion engine whether of the diesel type or the spark-ignition type, conventionally comprises a cylinder head mounted on a crankcase, these two parts being cooled and lubricated by means of circulations. water (or air) and oil, respectively.
- the oil follows a circuit which passes into the cylinder head, in particular to lubricate bearings of camshafts for controlling the cylinder valves. This oil then returns by gravity into the crankcase via so-called “oil redes- ters” passages integrated into the cylinder head, in particular for reasons of compactness.
- Diagram 1 is shown diagrammatically in FIG. 1 of the appended drawing, in vertical section.
- This passage comprises an inlet chute 2, a tubular central portion 3 and an outlet chute 4. It is shaped so as to deviate as much as possible from hot spots such as that, referenced 5, created by a conduit 6 of Exhaust gas outlet, shown in cross section. Indeed overheating of the dripping oil, according to the arrow F, on an inclined inner wall portion 7 of such a passage adjacent to the duct 6, accelerates the degradation of its lubricating properties and therefore the interval between oil changes. 'oil.
- a typical solution of this problem is to cool the hot spot by passing the cooling water circuit.
- the present invention aims to provide an internal combustion engine cylinder head designed to allow a particularly compact embodiment of the engine, however preventing overheating of the lubricating oil passing in the abovementioned oil recesses.
- the present invention also aims to achieve this result without going through an expensive revision of the geometry of the cylinder head.
- an internal combustion engine cylinder head comprising a lubricating oil circuit, this circuit comprising at least one passage for the descent by gravity of the oil to a cylinder block associated with the cylinder head in the engine, this passage comprising at least one inner wall portion disposed in heat transfer relationship with a hot spot of the cylinder head, the latter being remarkable in that this passage is equipped with a screen means preventing any run-off oil descending on this wall portion.
- this passage is equipped with a screen means preventing any run-off oil descending on this wall portion.
- the screen means takes the form of a tube in which the oil goes back down, away from the inner wall portion adjacent to the hot spot,
- the tube is attached and fixed in the passage, the tube is fixed in the passage by hooping
- the tube is fixed by hooping in a complementary part of the passage machined for this purpose
- the tube is fixed by screwing or by gluing
- the wall portion of the passage in heat transfer relationship with the hot spot comprises at least a portion of an entrance trough of the passage, the shield means extending into this inlet trough to prevent oil run-off on this part of the entrance chute,
- the screen means is made of a material with a low thermal conductivity
- the invention also provides an internal combustion engine comprising a crankcase and a cylinder head according to the present invention.
- FIG. 1 is a schematic representation, in vertical section, of a descent pass lubricating oil in an internal combustion engine cylinder head of conventional design, this figure being described in the preamble of the present patent application, and
- FIGS. 2 and 3 are diagrammatic representations, similar to that of FIG. 1, of first and second embodiments, respectively, of an oil drop passage in a cylinder head according to the present invention.
- FIGS. 2 and 3 reference numerals identical to references used in FIG. 1 identify identical or similar elements or members.
- this request is satisfied, while protecting the lubricating oil from overheating degradation, by preventing run-off of oil in the passage 1, on the wall part 7 of this passage. heat transfer relationship with hot spot 5.
- this screen means takes the form of a tube 8 of substantially vertical axis, reported and fixed in the central part 3 of the passage 1 and extending from this central part at the bottom of the outlet chute 4 of this passage.
- the tube 8 has a cross section complementary to that of the central portion 3 of the passage 1 so as to fit exactly therein.
- the tube collects the oil collected by the inlet chute 2, including that which flows on its walls, and channels it vertically in the outlet channel 4 by preventing this oil from running off the walls of the tank.
- this chute including the wall portion 7 superheated by the high temperature exhaust gas flowing in the duct 6, due to the conductive heat transfer which takes place through the metal material of which the body is made.
- the cylinder head in particular in the narrow space which separates the duct 6 from the wall portion 7. This avoids any overheating of the oil in the passage through the passage 1, in accordance with the purpose of the present invention.
- the tube 8 is integrated in a pre-existing passage.
- the tube 8 is fixed by hooping in the central portion 3, then of complementary section, of the passage 1, so in a tight fit.
- the tube 8 is made of a relatively low thermal conductivity material.
- this material may be a stainless steel, whose thermal conductivity is 7 to 8 times lower than that of the aluminum constituting the cylinder head.
- the screen effect established by the tube 8 is reinforced.
- this problem is solved by doubling the wall of the passage 1 over its entire height, by extending the screen means in the inlet trough 2, as shown schematically in FIG. 3.
- This extension 1 1 can take the shape of the inlet chute 3 and be dimensioned so as to be installed behind the wall of this chute, as shown.
- the extension 11 comprises a cylindrical portion 12 formed at its base to be inserted into the upper part of the tube 8, which it doubles at the central part 3 of the passage 1.
- the part 12 is fixed in the upper part of the tube 8 by any suitable means.
- the extension 11 of the screen collects the lubricating oil which enters by gravity into the passage 1 and channels it to and into the tube 8, thus keeping this oil constantly spaced from the wall of the passage 1, and therefore parts of this wall which are in heat transfer relationship with hot spots 10, 5 and 9.
- the invention makes it possible to achieve the goals announced, namely to prevent the overheating degradation of the lubricating oil in the oil recesses of the cylinder head and this without major revision of the geometry of the cylinder head and without increasing its size.
- the invention is thus particularly well suited to implementation in a small-sized motor design that nevertheless has high performance in terms of power and / or efficiency.
- the isolation established by the present invention between the oil and the exhaust gas avoids cooling thereof by this oil.
- the exhaust gases then maintain a high temperature which enhances the effectiveness of the treatment means for these gases conventionally installed in the engine exhaust line to rid them of the harmful chemical species they contain.
- the invention is not limited to the embodiments described and shown which have been given by way of example only.
- the tube 8 could be fixed in the oil down passage by means other than shrinking, for example by screwing or gluing.
- this tube could have a cross section other than circular, for example square, rectangular or elliptical.
- the invention is applicable to the treatment of hot spots created in a downflow oil by a heat source other than an exhaust gas outlet conduit.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Valve Device For Special Equipments (AREA)
- Valve-Gear Or Valve Arrangements (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0655875A FR2910554B1 (fr) | 2006-12-22 | 2006-12-22 | Culasse de moteur a combustion interne |
| PCT/EP2007/063291 WO2008080742A1 (fr) | 2006-12-22 | 2007-12-04 | Culasse de moteur a combustion interne |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2102478A1 true EP2102478A1 (fr) | 2009-09-23 |
| EP2102478B1 EP2102478B1 (fr) | 2010-08-11 |
Family
ID=38462018
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07847792A Not-in-force EP2102478B1 (fr) | 2006-12-22 | 2007-12-04 | Culasse de moteur a combustion interne |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2102478B1 (fr) |
| AT (1) | ATE477412T1 (fr) |
| DE (1) | DE602007008472D1 (fr) |
| FR (1) | FR2910554B1 (fr) |
| WO (1) | WO2008080742A1 (fr) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB201208935D0 (en) * | 2012-05-21 | 2012-07-04 | Ford Global Tech Llc | An engine system |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4018195A (en) * | 1975-10-06 | 1977-04-19 | General Motors Corporation | Insulated, high efficiency, low heat rejection, engine cylinder head |
| JPH088287Y2 (ja) * | 1988-02-22 | 1996-03-06 | 日産自動車株式会社 | Dohc4バルブ型内燃機関のシリンダヘッド |
| DE19854521C1 (de) * | 1998-11-26 | 2000-06-08 | Muendener Gummiwerk Gmbh | Isolierte Schlauchleitung |
| JP2002155720A (ja) * | 2000-11-20 | 2002-05-31 | Yamaha Motor Co Ltd | ブローバイガス還元装置のユニオン構造 |
| DE10339622B4 (de) * | 2003-08-28 | 2006-01-26 | Mündener Gummiwerk Gmbh | Vorrichtung zur Rückführung von Gasen oder Gasen und Flüssigkeiten aus einem Kurbelgehäuse oder einem anderen Hohlraum eines Verbrennungsmotors in eine Ansaugleitung des Verbrennungsmotors |
-
2006
- 2006-12-22 FR FR0655875A patent/FR2910554B1/fr not_active Expired - Fee Related
-
2007
- 2007-12-04 EP EP07847792A patent/EP2102478B1/fr not_active Not-in-force
- 2007-12-04 DE DE602007008472T patent/DE602007008472D1/de active Active
- 2007-12-04 WO PCT/EP2007/063291 patent/WO2008080742A1/fr not_active Ceased
- 2007-12-04 AT AT07847792T patent/ATE477412T1/de not_active IP Right Cessation
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008080742A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2102478B1 (fr) | 2010-08-11 |
| DE602007008472D1 (de) | 2010-09-23 |
| FR2910554A1 (fr) | 2008-06-27 |
| WO2008080742A1 (fr) | 2008-07-10 |
| FR2910554B1 (fr) | 2009-01-23 |
| ATE477412T1 (de) | 2010-08-15 |
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