EP2039925A1 - Anordnung zur Befestigung eines Einspritzrohrs in einen Zylinderkopf durch Schrumpfung - Google Patents
Anordnung zur Befestigung eines Einspritzrohrs in einen Zylinderkopf durch Schrumpfung Download PDFInfo
- Publication number
- EP2039925A1 EP2039925A1 EP08300267A EP08300267A EP2039925A1 EP 2039925 A1 EP2039925 A1 EP 2039925A1 EP 08300267 A EP08300267 A EP 08300267A EP 08300267 A EP08300267 A EP 08300267A EP 2039925 A1 EP2039925 A1 EP 2039925A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injector tube
- injector
- cylinder head
- housing
- tube
- 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- Withdrawn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
- 230000006835 compression Effects 0.000 claims abstract description 39
- 238000007906 compression Methods 0.000 claims abstract description 39
- 239000002826 coolant Substances 0.000 claims abstract description 10
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 230000000903 blocking effect Effects 0.000 claims abstract description 3
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 13
- 230000000295 complement effect Effects 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000004939 coking Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000110 cooling liquid Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/14—Arrangements of injectors with respect to engines; Mounting of injectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
- F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
- F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
Definitions
- the invention relates to the field of internal combustion engines and direct injection and more particularly to an arrangement for fixing a shrink-type injector tube in a direct injection type engine cylinder cooled by a cooling liquid.
- a direct injection-type heat engine generally comprises a cylinder head in which a housing is provided, in which an injector tube and a substantially cylindrical injector are arranged, a lower end of which opens into a combustion chamber of the engine, and of which at least one intermediate portion is sealingly received in a water chamber or coolant circulation cavity of the cylinder head.
- the shape of the injector tube in its part in contact with the coolant must match that of the injector.
- the thermal barrier existing between the coolant and the injector is substantially 1 to 2 mm, which allows a better cooling of the injector compared to a thermal barrier of substantially 6 to 8 mm for an injector housing which would be realized in a foundry wells.
- a shrink-injector tube avoids coking phenomena injector nose to which are exposed direct injection engines.
- the injector tube To position the injector tube in its housing, it is conventionally introduced by an upper end of the housing formed in the cylinder head.
- the arrangement of the injector tube in the cylinder head comprises stop means for locking in position the injector tube in an associated hooping zone of the housing.
- the injector tube comprises a radial shoulder adapted to cooperate with a complementary portion of the inner wall of the housing formed in the cylinder head.
- This hooping zone is substantially narrower than the rest of the housing so that the injector tube conforms to the shape of the injector nose.
- a compression of the injector tube places the shrinking zone of the breech vis-a-vis with the lower end of the injector tube.
- the displacement of the injector tube is locked in position when the radial shoulder of the injector tube abuts against the complementary potion of the inner wall of the housing formed in the cylinder head.
- the injector tube is during a mounting step subjected to compressive or tensile stresses that can cause unwanted deformations and alter the final assembly or destroy the injector tube.
- one method is to increase the thickness of the tube-injector to make it more solid.
- it is necessary to increase the thickness thereof by two-thirds.
- the thermal barrier between the coolant and the injector is then increased, which does not properly cool the injector.
- an object of this invention is therefore to propose an improved arrangement for fastening a tube-injector in a housing formed in a cylinder head.
- the invention proposes an arrangement for the shrink fitting of an injector tube intended to receive an injector, in a housing formed in a direct injection engine cylinder head via a compression tool. and a press, said housing passing through a coolant cavity, said injector tube having on either side of said cavity a coaxial lower portion intended to be hooped in an associated lower bearing surface of the housing, and an upper part intended to be received in an upper chamber of the housing, said arrangement comprising stop means blocking the injector tube in position in the lower seat, characterized in that the compression tool comprises the stop means so that the injector tube is locked in position in the lower range of the cylinder head when the stop means of the compression tool are in abutment on the cylinder head.
- the injector tube has a simpler and more compact shape thus reducing the production costs not only of the injector tube but also of the cylinder head itself. It is no longer necessary to create means of stopping inside the housing provided either in the part located above the water chamber or at the water chamber and the zone of water. hooping.
- the final assembly is further simplified, the final position of the injector tube relative to the cylinder head being provided by the precise dimensions of the compression tool used for hooping.
- the invention also relates to a direct injection type heat engine comprising such an arrangement.
- FIG. 1 there is shown a sectional view of a cylinder head 1 for a combustion engine (not shown) of a direct injection-type motor vehicle, that is to say having an injector opening directly into a combustion chamber of the engine (not shown).
- the cylinder head 1 is traversed by a bore or housing 30 in which is arranged an injector tube 2 for receiving a substantially cylindrical injector (not shown), a lower end or injector nose opens into the combustion chamber of the engine. At least an intermediate portion of the injector is sealed in a water chamber or coolant circulation cavity 3 of the curtain 1.
- the cylinder head 1 thus comprises an upper portion 11 located above the chamber water 3 and a lower portion or sole 12 located between the water chamber 3 and the combustion chamber.
- the injector tube 2 comprises on either side of the cavity 3, a coaxial lower portion 22 intended to be rubbed in a hooping zone 32 or associated substantially lower cylindrical surface 32 of the housing 30 of the cylinder head 1, and a portion upper portion 21 intended to be received in a substantially cylindrical surface 31 of the housing 30 of the cylinder head 1.
- the rubbing zone 32 adapted to receive the nozzle nose is narrower than the upper part 21.
- the injector tube 2 comprises a radial shoulder 23, oriented towards the inside of the housing 30 forming a seat 23 adapted to receive a compression tool 4 for fastening by hooping.
- the compression tool 4 has a substantially cylindrical shape adapted to be housed in the upper part 21 of the injector tube 2, and has a lower face 42 adapted to cooperate with the shoulder 23 of the injector tube.
- the compression tool 4 comprises stop means 43 adapted to cooperate with the cylinder head 1.
- the stop means 43 are intended to be in contact with a bearing zone 110 located at the periphery of the housing formed in the cylinder head 1 during the compression of the injector tube 2.
- the stop means are formed by a radial shoulder of the compression tool 4.
- the radial shoulder 43 thus forms an axial abutment.
- a first hooping step consists in placing the injector tube 2 in the housing formed in the cylinder head 1. Then the injector tube 2 is compressed using a press (not shown) and the compression tool 4. During this compression, the lower portion 22 of the injector tube 2 is hooped in the associated hooping zone 32. The displacement of the compression tool 4, and therefore of the injector tube 2 is locked in position when the compression tool 4 comes into abutment on the cylinder head 1, that is to say when the shoulder 43 of the compression tool 4 comes into abutment on the bearing zone 110 of the cylinder head 1.
- the final position of the injector tube 2 in the cylinder head 1 is thus achieved thanks to a precise dimension of the compression tool 4, in particular between the seat 23 and the radial shoulder 43.
- the injector tube 2 then undergoes no further stress when the compression tool 4 comes into abutment on the cylinder head 1. In fact, it is the latter 1 which receives the compression forces at the end of the shrinking of the tube-injector 2. The risks of deformation or destruction of the injector tube 2 are thus reduced.
- the shape of the injector tube 2 can thus be simplified. It is also not necessary to add stop elements in the inner wall of the housing 30 formed in the cylinder head 1.
- the upper end of the substantially cylindrical injector tube 2 is received in the upper end 11 associated with the cylinder head 1.
- At least one O-ring is interposed between the upper end of the injector tube 2 and the end upper 11 of the cylinder head 1 to seal the injector tube 2.
- the upper end 11 of the yoke comprises an axial shoulder 13 projecting from the periphery of the housing 30 formed in the cylinder head 1.
- the axial shoulder 13 thus forms a projecting ring, and constitutes the bearing zone 110 of the cylinder head 1 on which the compression tool 4 comes into abutment when the lower part 22 of the injector tube 2 is hooped.
- the dimensions of the radial shoulder 43 of the compression tool 4 and of the axial shoulder 13 of the yoke 1 are such that when the compression tool 4 comes into abutment against the yoke 1, the tube -injector 2 is shrunk in its shrinking zone 32.
- the axial shoulder 13 may comprise at least two crown portions forming bearing zones 110.
- the radial shoulder 43 of the compression tool 4 comprises at its end an axial shoulder 14, oriented in the compression direction of the injector tube 2.
- the shape of the bearing zone 110 of the cylinder head 1 is complementary to the shape of the compression tool 4, and can either be flat ( figure 3 ), or have an axial shoulder ( figure 4 ) whose dimensions are such that when the compression tool 4 comes into abutment against the cylinder head 1, the injector tube 2 is shrunk in its shrinking zone 32.
- the injector tube 2 undergoes no stress when the compression tool 4 abuts on the cylinder head 1.
- the injector tube has a simpler and more compact shape thus reducing the production costs not only of the injector tube but also of the cylinder head itself.
- the final assembly is further simplified, the final position of the injector tube relative to the cylinder head being provided by the precise dimensions of the compression tool used for hooping.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Fuel-Injection Apparatus (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0757575A FR2921005B1 (fr) | 2007-09-14 | 2007-09-14 | Agencement pour la fixation par frettage d'un tube-injecteur dans une culasse. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP2039925A1 true EP2039925A1 (de) | 2009-03-25 |
Family
ID=39283850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP08300267A Withdrawn EP2039925A1 (de) | 2007-09-14 | 2008-09-10 | Anordnung zur Befestigung eines Einspritzrohrs in einen Zylinderkopf durch Schrumpfung |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP2039925A1 (de) |
| FR (1) | FR2921005B1 (de) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3014958A1 (fr) * | 2013-12-13 | 2015-06-19 | Peugeot Citroen Automobiles Sa | <p>moteur a combustion a injecteur etanche</p> |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19600562C1 (de) * | 1996-01-09 | 1997-05-22 | Daimler Benz Ag | Direkteinspritzende Brennkraftmaschine |
| US5784783A (en) * | 1996-04-18 | 1998-07-28 | Carpenter; Donald L. | Method of removing an injector sleeve |
| FR2763649A1 (fr) * | 1997-05-20 | 1998-11-27 | Peugeot | Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur a combustion interne, et un procede de montage de cet injecteur |
| JP2000170627A (ja) | 1998-12-09 | 2000-06-20 | Isuzu Motors Ltd | 燃料噴射ノズルの取付構造 |
| JP2006161727A (ja) * | 2004-12-08 | 2006-06-22 | Mitsubishi Motors Corp | インジェクタの取付構造 |
-
2007
- 2007-09-14 FR FR0757575A patent/FR2921005B1/fr not_active Expired - Fee Related
-
2008
- 2008-09-10 EP EP08300267A patent/EP2039925A1/de not_active Withdrawn
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19600562C1 (de) * | 1996-01-09 | 1997-05-22 | Daimler Benz Ag | Direkteinspritzende Brennkraftmaschine |
| US5784783A (en) * | 1996-04-18 | 1998-07-28 | Carpenter; Donald L. | Method of removing an injector sleeve |
| FR2763649A1 (fr) * | 1997-05-20 | 1998-11-27 | Peugeot | Dispositif de fixation d'un injecteur de carburant sur une culasse de moteur a combustion interne, et un procede de montage de cet injecteur |
| JP2000170627A (ja) | 1998-12-09 | 2000-06-20 | Isuzu Motors Ltd | 燃料噴射ノズルの取付構造 |
| JP2006161727A (ja) * | 2004-12-08 | 2006-06-22 | Mitsubishi Motors Corp | インジェクタの取付構造 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3014958A1 (fr) * | 2013-12-13 | 2015-06-19 | Peugeot Citroen Automobiles Sa | <p>moteur a combustion a injecteur etanche</p> |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2921005B1 (fr) | 2009-10-30 |
| FR2921005A1 (fr) | 2009-03-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
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| AK | Designated contracting states |
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| AX | Request for extension of the european patent |
Extension state: AL BA MK RS |
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| 17P | Request for examination filed |
Effective date: 20090421 |
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| 17Q | First examination report despatched |
Effective date: 20090612 |
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| AKX | Designation fees paid |
Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR |
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| GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
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| STAA | Information on the status of an ep patent application or granted ep patent |
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| 18D | Application deemed to be withdrawn |
Effective date: 20130302 |