EP2542764A1 - Culasse de moteur a combustion interne - Google Patents
Culasse de moteur a combustion interneInfo
- Publication number
- EP2542764A1 EP2542764A1 EP11712907A EP11712907A EP2542764A1 EP 2542764 A1 EP2542764 A1 EP 2542764A1 EP 11712907 A EP11712907 A EP 11712907A EP 11712907 A EP11712907 A EP 11712907A EP 2542764 A1 EP2542764 A1 EP 2542764A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- internal combustion
- combustion engine
- cylinder
- cylinder head
- bridge
- 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
- 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
- F02F1/4235—Shape or arrangement of intake or exhaust channels in cylinder heads of intake channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/26—Valve-gear or valve arrangements, e.g. lift-valve gear characterised by the provision of two or more valves operated simultaneously by same transmitting-gear; peculiar to machines or engines with more than two lift-valves per cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/22—Valve-seats not provided for in preceding subgroups of this group; Fixing of valve-seats
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L3/00—Lift-valve, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces; Parts or accessories thereof
- F01L3/24—Safety means or accessories, not provided for in preceding sub- groups of this group
-
- 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
- F02F2001/008—Stress problems, especially related to thermal stress
-
- 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
- F02F2001/248—Methods for avoiding thermal stress-induced cracks in the zone between valve seat openings
Definitions
- the present invention relates to a cylinder head of an internal combustion engine.
- valve seats of a motor cylinder head by inserting by shrinking in housings provided for this purpose in the cylinder head of the reported cast steel or sintered seats.
- the seats are pushed into their homes.
- the fitting force is important, between 200 daN and 500 daN, and it spreads around the housing on a relatively small contact surface.
- the installation of a seat therefore induces significant stresses on the contact surface between the seat and the housing and, consequently, on the area of the trigger guard, that is to say in the narrow zone between two seats of the seat. valve or between a valve seat and the opening opening of a precombustion combustion engine.
- jumpers are located in the part of the cylinder head subjected to the highest temperatures. They are subjected to cycles of heating and cooling at each cycle of operation of the engine. These are fragile areas, more heated than the surrounding areas, which are more massive and better cooled during engine operation.
- the document FR 2,736,969 describes a cylinder head of an internal combustion engine, in particular for a motor vehicle, of the type comprising a fire surface which delimits a combustion chamber of a cylinder of the engine, of the type having at least two openings which open into the combustion chamber and which are separated by a trigger guard, and of the type in which the trigger guard comprises at least one groove formed in the fire face of the cylinder head, substantially parallel to the direction joining the axes of the orifices.
- the groove has a reduced width relative to its depth, in particular a width less than one tenth of its depth.
- the object of the present invention is to provide an internal combustion engine cylinder head, in which the intersope valve bridge zones and / or the zones between a valve seat and an orifice of the combustion face of the cylinder head. excellent thermomechanical behavior, that is to say practically without risk of cracking or crack initiation.
- Another object of the present invention is to provide such a breech with excellent thermomechanical strength, which is of simple design and construction and is economical.
- the hollow form may be a straight circular cylinder sector made by means of a circular material removal tool.
- the present invention is advantageously applied when the bridge between the two orifices is of a width less than 2 mm before the embodiment of the hollow form.
- At least one of the two orifices may be a valve seat housing.
- the depth of the recessed shape is less than a determined value so that the valve seat at least does not come out of its housing a height substantially equal to or greater than one third of the height of said valve seat.
- a trigger guard separating two exhaust valve seats, to a trigger guard separating an intake valve seat and a exhaust valve seat, with a trigger guard separating an intake or exhaust valve seat from any open orifice, for example the opening opening of a combustion chamber arranged inside the cylinder head and opening in the combustion chamber.
- the present invention does not only concern four-valve cylinders, but can be applied to internal combustion engine cylinders having two or three valves, for example.
- the present invention also relates to a multi-cylinder internal combustion engine, each cylinder having at least two valves, which comprises a cylinder head according to that described above in outline.
- This internal combustion engine can be a gasoline engine or a diesel engine. It can be a two-, three- or four-cylinder engine, or even, for example, a five-cylinder in-line or "V" engine.
- FIG. 1 schematically represents the two intake valve housings of the combustion face of a four-valve cylinder of an internal combustion engine and the narrow zone, known as a trigger guard, between the two housings;
- FIG. 2 shows the housings of FIG. 1 with a "widened" bridge, according to the present invention
- FIG. 3 schematically illustrates the maximum height of the hollow shape made on the bridge according to the principle of the present invention.
- a part of the combustion face, also called fire face, of a general reference cylinder head 1 which closes the combustion chamber of a four-valve cylinder of a three-cylinder gasoline internal combustion engine.
- the combustion face of Figure 1 is provided with two orifices, referenced generally 10 and 20, both intended to receive an intake valve seat of the fuel air mixture.
- the orifices 50 and 60 are intended to receive, each, an exhaust valve seat and the orifice 70 opens into the combustion chamber.
- the housing 10 and 20 delimit between them a narrow zone or "bridge" referenced 30.
- This hollow form 32 is preferably a circular shape, specifically a straight circular cylinder sector made by means of a circular material removal tool.
- the width of the bridge 32 between the two housing 10 and 20 of the inlet valve has been increased in this way; it has increased from 1.35 mm ("e" in FIG. 1) to 2.15 mm (“E” of FIG. 2), that is to say at a value greater than 2 mm to significantly reduce the risk of cracking and crack initiation.
- the hollow form 32 made in the bridge 30 increases the width of the latter by about 60%.
- This maximum thickness "H” is defined according to the architecture of the tablature face (diameter and height of the valve seats, distance between the axes of the valves, etc.).
- the depth of the recessed shape must be less than a determined value so that the valve seats, referenced 1 1 and 21 in FIG. 3, do not come out of their housing 10 or 20 respectively. , of a height substantially equal to or greater than one-third of their height.
- the present invention applies to cylinders of internal combustion engines having a different number of valves, namely to cylinders with two or three valves, for example.
- the invention can be applied to all types of internal combustion engines: gasoline engines, diesel engines, two, three, four or five-cylinder engines, inline or inline cylinder engines. engines with "V" cylinders.
- the embodiment of the invention described above relates to a four-valve cylinder, the present invention applies to cylinders of internal combustion engines having a different number of valves, namely to cylinders with two or three valves, for example.
- the cylinder head described above by a particular example of its embodiment has the advantage of obtaining, at low cost, in a restricted environment, bridges of sufficient width to avoid cracking and crack initiation that could cause the strong thermomechanical stresses to which they are subjected.
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)
- Combustion Methods Of Internal-Combustion Engines (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1051598A FR2957120B1 (fr) | 2010-03-05 | 2010-03-05 | Culasse de moteur a combustion interne |
| PCT/FR2011/050314 WO2011107687A1 (fr) | 2010-03-05 | 2011-02-15 | Culasse de moteur a combustion interne |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2542764A1 true EP2542764A1 (fr) | 2013-01-09 |
| EP2542764B1 EP2542764B1 (fr) | 2021-04-21 |
Family
ID=43244966
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP11712907.2A Active EP2542764B1 (fr) | 2010-03-05 | 2011-02-15 | Culasse de moteur a combustion interne |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2542764B1 (fr) |
| CN (1) | CN102791967B (fr) |
| FR (1) | FR2957120B1 (fr) |
| WO (1) | WO2011107687A1 (fr) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5862344A (ja) * | 1981-10-07 | 1983-04-13 | Hino Motors Ltd | 内燃機関シリンダヘツドの亀裂防止方法 |
| JPH0137157Y2 (fr) * | 1984-12-14 | 1989-11-09 | ||
| IN168097B (fr) * | 1985-12-12 | 1991-02-02 | Cummins Engine Co Inc | |
| IT210778Z2 (it) * | 1987-06-09 | 1989-01-11 | Iveco Fiat | Testa per un motore diesel |
| JPH01321076A (ja) * | 1988-06-24 | 1989-12-27 | Hino Motors Ltd | シリンダヘッドの亀裂防止方法 |
| FR2736969B1 (fr) * | 1995-07-18 | 1997-08-29 | Renault | Culasse de moteur a combustion interne comportant un pontet muni d'une rainure |
| JP2002276460A (ja) * | 2001-03-22 | 2002-09-25 | Isuzu Motors Ltd | シリンダヘッド |
| JP4457239B2 (ja) * | 2005-08-04 | 2010-04-28 | Udトラックス株式会社 | シリンダヘッドの冷却構造の加工方法 |
| CN201461117U (zh) * | 2009-05-08 | 2010-05-12 | 东风康明斯发动机有限公司 | 可减少热应力的气缸盖 |
-
2010
- 2010-03-05 FR FR1051598A patent/FR2957120B1/fr not_active Expired - Fee Related
-
2011
- 2011-02-15 WO PCT/FR2011/050314 patent/WO2011107687A1/fr not_active Ceased
- 2011-02-15 CN CN201180012237.6A patent/CN102791967B/zh not_active Expired - Fee Related
- 2011-02-15 EP EP11712907.2A patent/EP2542764B1/fr active Active
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2011107687A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2957120B1 (fr) | 2013-06-07 |
| FR2957120A1 (fr) | 2011-09-09 |
| EP2542764B1 (fr) | 2021-04-21 |
| CN102791967A (zh) | 2012-11-21 |
| WO2011107687A1 (fr) | 2011-09-09 |
| CN102791967B (zh) | 2016-04-13 |
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