EP3365549A1 - Fuel injector nozzle shield - Google Patents

Fuel injector nozzle shield

Info

Publication number
EP3365549A1
EP3365549A1 EP16781472.2A EP16781472A EP3365549A1 EP 3365549 A1 EP3365549 A1 EP 3365549A1 EP 16781472 A EP16781472 A EP 16781472A EP 3365549 A1 EP3365549 A1 EP 3365549A1
Authority
EP
European Patent Office
Prior art keywords
shield
face
collar
fuel
protecting member
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
Application number
EP16781472.2A
Other languages
German (de)
French (fr)
Other versions
EP3365549B1 (en
Inventor
Nathan Peter KEELER
Simon Phillips
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Delphi Technologies IP Ltd
Original Assignee
Delphi Technologies IP Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Delphi Technologies IP Ltd filed Critical Delphi Technologies IP Ltd
Publication of EP3365549A1 publication Critical patent/EP3365549A1/en
Application granted granted Critical
Publication of EP3365549B1 publication Critical patent/EP3365549B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/046—Injectors with heating, cooling, or thermally-insulating means with thermally-insulating means
    • 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

Definitions

  • the present invention relates generally to a fuel injector and more particularly to shield to inserted between the nozzle of the injector and an engine block.
  • Fuel injectors are typically inserted in deep well provided in engine block. More precisely, in each well is press-fitted an injector pocket member having a large section portion outwardly opening on the top face of the engine block and, a small section portion extending from the large portion and ultimately opening in a combustion chamber of the engine. In the injector pocket member is placed a fuel injector having a main large section body, that is arranged in the large section portion of the injector pocket and, a narrow section nozzle arranged in the small section portion of the injector pocket.
  • a tubular shield typically machined from copper alloy that has excellent thermal conductivity properties.
  • the press-fit intimately links the shield to the nozzle and, around the shield is reserved an annular air gap of few tenths of millimeters between outer face of the shield and the inner face of the small section portion of the injector pocket member.
  • a collar forming a disc outwardly extending from the tubular shield toward a peripheral circular edge.
  • the collar is compressed between a shoulder face of the injector pocket, which is between the large and the small portions, and a shoulder face of the injector nut of the fuel injector.
  • the injector is maintained in place by a bracket member arranged over its top and that is screwed in the engine block downwardly biasing the injector and compressing the collar.
  • the shield enables in use to evacuate the heat generated in a combustion chamber and transferred to the nozzle, from said nozzle toward the engine block and, the collar seals the large section portion, in which is fuel at low pressure, from the small section portion. Constant enhancement of performances requires improvement of the thermal protection of the nozzle.
  • the shield has a metallic body comprising a tubular portion inside of which the cylindrical nozzle of the fuel injector can be press-fitted with interference and, that is able to be inserted with clearance in a cylindrical hole of the engine block.
  • the shield further comprises a thermal protecting member arranged over the external face of the tubular portion.
  • the thermal protecting member has a lower thermal conductivity than the metallic body.
  • the thermal protecting member is integral to the tubular portion, for instance, the thermal protecting member can be a coating of the external cylindrical face of the tubular member.
  • the coating can comprise tin.
  • the metallic body of the shield is made of copper alloy.
  • the shield further comprises a collar forming a thick disc radially outwardly extending from an extremity of the tubular portion.
  • the collar has a first face, or upper face, an opposed second face, or under face, and, a peripheral face joining the first face to the second face. In use, the collar is compressed between a shoulder face of the fuel injector abutting against the first face and, a shoulder face provided in the engine block abutting against the second face of the collar.
  • the shield further comprises a fuel protecting member arranged over the peripheral face of the collar.
  • the fuel protecting member further extends over the first face of the collar.
  • the fuel protecting member is integral to the collar, for instance, the fuel protecting member can be a coating the collar. Said coating comprises tin. In an embodiment, the heat protecting coating and the fuel protecting coating are made of the same material.
  • the heat protecting member and the fuel protecting member are made of different materials.
  • the invention further extends to a fuel injector having a cylindrical nozzle for delivering fuel in a combustion chamber of an internal combustion engine and, a shield press-fitted over said cylindrical nozzle, the shield being as described above.
  • An engine block 10 is provided with a coolant gallery 12, represented horizontal and, with a vertical opening 14 extending along a main axis Z and, in which is inserted with press-fit an injector pocket 16.
  • the injector pocket 16 has a tubular body having a peripheral wall defining an internal volume V comprising a large section portion 18 upwardly opening in a top face of the engine block 10 and, a small section portion 20 downwardly opening in a combustion chamber 22 of the engine, said large and small section being joined via a transverse shoulder face 24.
  • a fuel injector 26 having a large section actuator member 28 from the bottom of which axially Z extends a narrow cylindrical nozzle assembly 30, said actuator member and nozzle fixed to each other by a cap nut 32 defining another transverse shoulder face 34.
  • a tubular shield 36 Press fitted onto the cylindrical nozzle 30 is a tubular shield 36, having a tubular portion 38 at an extremity of perpendicularly extends a collar 40.
  • the tubular portion 38 is press fitted on the cylindrical nozzle 30 and it extends from an open lower extremity 42 up to an opposite open upper extremity 44 where outwardly perpendicularly the collar 40 is.
  • the collar 40 has an upper face 46 radially extending from an internal circular edge that is common with the internal face 48 of the tubular portion to, an external circular edge that is common with a peripheral cylindrical face 50 of the collar.
  • the collar 40 parallel to the upper face 46, the collar 40 has an under face 52 radially extending toward an external circular edge that is common with the peripheral cylindrical face 50 of the collar.
  • the under face 52 merges with the cylindrical external face 54 of the tubular portion via a fillet, although this could be another shape such as a chamfer or a straight edge.
  • the shield 36 Although several materials may be utilized for manufacturing the shield 36, it is known to use a copper alloy, such as Tellurium Copper (CuTeP), which has excellent thermal conductivity.
  • CuTeP Tellurium Copper
  • the external face 54 of the tubular portion is covered by a thermal protecting coating 56 having a thermal conductivity inferior to the conductivity mentioned above for the core of the shield, one of the preferred materials for said thermal coating being a tin alloy.
  • the upper face 46 of the collar is covered by a fuel protecting coating 58 preventing direct fuel contacts between the copper alloy shied and fuel that may be present in the injector pocket 16.
  • a fuel protecting coating 58 preventing direct fuel contacts between the copper alloy shied and fuel that may be present in the injector pocket 16.
  • the surface coatings that are integral to the shield one may prefer to arrange independent metallic sleeves fixed over the tubular portion and over the upper and peripheral faces of the shield 36.
  • the large actuator portion 28 occupies the large section of the injector pocket 16 and, the narrow nozzle 30 around which is press fitted the shield 36, is engaged with a clearance C of few tenths of millimeters in the small section portion 20 of the injector pocket.
  • the collar 40 is axially Z compressed between the shoulder face 34 of the fuel injector and the shoulder face 24 of the injector pocket, the compression force being generated by a clamp, not shown, screwed on the top face of the engine block downwardly compressing the fuel injector inside the injector pocket.
  • the thermal coating 56 limits the heat transfer from the vicinity of the combustion chamber 22 toward the nozzle 30 while the heat of the nozzle may be channeled by the tubular portion of the shield toward the collar then, through the contact between the under face of the collar to the injector pocket.

Abstract

A shield (36) is adapted to be arranged between the nozzle (30) of a fuel injector (26) and an engine block (10), the shield (36) having a metallic body comprising a tubular portion (38) inside of which the cylindrical nozzle of the fuel injector can be press-fitted with interference and, that is able to be inserted with clearance (C) in a cylindrical hole of the engine block. The shield (36) further comprises a thermal protecting member (56) arranged over the external face (54) of the tubular portion.

Description

Fuel injector nozzle shield TECHNICAL FIELD
The present invention relates generally to a fuel injector and more particularly to shield to inserted between the nozzle of the injector and an engine block. BACKGROUND OF THE INVENTION
Fuel injectors are typically inserted in deep well provided in engine block. More precisely, in each well is press-fitted an injector pocket member having a large section portion outwardly opening on the top face of the engine block and, a small section portion extending from the large portion and ultimately opening in a combustion chamber of the engine. In the injector pocket member is placed a fuel injector having a main large section body, that is arranged in the large section portion of the injector pocket and, a narrow section nozzle arranged in the small section portion of the injector pocket.
More precisely, around the nozzle is press-fitted a tubular shield typically machined from copper alloy that has excellent thermal conductivity properties. The press-fit intimately links the shield to the nozzle and, around the shield is reserved an annular air gap of few tenths of millimeters between outer face of the shield and the inner face of the small section portion of the injector pocket member.
Furthermore, at an extremity of the shield is provided a collar forming a disc outwardly extending from the tubular shield toward a peripheral circular edge. In use, the collar is compressed between a shoulder face of the injector pocket, which is between the large and the small portions, and a shoulder face of the injector nut of the fuel injector. Ultimately, the injector is maintained in place by a bracket member arranged over its top and that is screwed in the engine block downwardly biasing the injector and compressing the collar.
In use, the shield enables in use to evacuate the heat generated in a combustion chamber and transferred to the nozzle, from said nozzle toward the engine block and, the collar seals the large section portion, in which is fuel at low pressure, from the small section portion. Constant enhancement of performances requires improvement of the thermal protection of the nozzle.
SUMMARY OF THE INVENTION
It is an object of the invention to resolve or at least mitigate the above mentioned problem by providing shield adapted to be arranged between the nozzle of a fuel injector and an engine block. The shield has a metallic body comprising a tubular portion inside of which the cylindrical nozzle of the fuel injector can be press-fitted with interference and, that is able to be inserted with clearance in a cylindrical hole of the engine block.
The shield further comprises a thermal protecting member arranged over the external face of the tubular portion.
The thermal protecting member has a lower thermal conductivity than the metallic body.
In an embodiment, the thermal protecting member is integral to the tubular portion, for instance, the thermal protecting member can be a coating of the external cylindrical face of the tubular member.
In said embodiment, the coating can comprise tin.
Also, the metallic body of the shield is made of copper alloy.
The shield further comprises a collar forming a thick disc radially outwardly extending from an extremity of the tubular portion. The collar has a first face, or upper face, an opposed second face, or under face, and, a peripheral face joining the first face to the second face. In use, the collar is compressed between a shoulder face of the fuel injector abutting against the first face and, a shoulder face provided in the engine block abutting against the second face of the collar.
Particularly, the shield further comprises a fuel protecting member arranged over the peripheral face of the collar.
The fuel protecting member further extends over the first face of the collar.
In an embodiment, the fuel protecting member is integral to the collar, for instance, the fuel protecting member can be a coating the collar. Said coating comprises tin. In an embodiment, the heat protecting coating and the fuel protecting coating are made of the same material.
In another embodiment, the heat protecting member and the fuel protecting member are made of different materials.
the invention further extends to a fuel injector having a cylindrical nozzle for delivering fuel in a combustion chamber of an internal combustion engine and, a shield press-fitted over said cylindrical nozzle, the shield being as described above. BRIEF DESCRIPTION OF THE DRAWINGS
The present invention is now described by way of example with reference to the accompanying figure that is an axial section of the arrangement of the fuel injector in an engine block. DESCRIPTION OF THE PREFERRED EMBODIMENTS
The arrangement of a fuel injector in an engine block is now described in reference to the figure. The description uses for simplification and clarity purposes the top-down arbitrary orientation of the figure without any intent to limit the scope of protection defined by the claims.
An engine block 10 is provided with a coolant gallery 12, represented horizontal and, with a vertical opening 14 extending along a main axis Z and, in which is inserted with press-fit an injector pocket 16. The injector pocket 16 has a tubular body having a peripheral wall defining an internal volume V comprising a large section portion 18 upwardly opening in a top face of the engine block 10 and, a small section portion 20 downwardly opening in a combustion chamber 22 of the engine, said large and small section being joined via a transverse shoulder face 24.
Inside said internal volume V is arranged a fuel injector 26 having a large section actuator member 28 from the bottom of which axially Z extends a narrow cylindrical nozzle assembly 30, said actuator member and nozzle fixed to each other by a cap nut 32 defining another transverse shoulder face 34.
Press fitted onto the cylindrical nozzle 30 is a tubular shield 36, having a tubular portion 38 at an extremity of perpendicularly extends a collar 40. The tubular portion 38 is press fitted on the cylindrical nozzle 30 and it extends from an open lower extremity 42 up to an opposite open upper extremity 44 where outwardly perpendicularly the collar 40 is. As visible on the figure, the collar 40 has an upper face 46 radially extending from an internal circular edge that is common with the internal face 48 of the tubular portion to, an external circular edge that is common with a peripheral cylindrical face 50 of the collar. Similarly, parallel to the upper face 46, the collar 40 has an under face 52 radially extending toward an external circular edge that is common with the peripheral cylindrical face 50 of the collar. On the illustration the under face 52 merges with the cylindrical external face 54 of the tubular portion via a fillet, although this could be another shape such as a chamfer or a straight edge.
Although several materials may be utilized for manufacturing the shield 36, it is known to use a copper alloy, such as Tellurium Copper (CuTeP), which has excellent thermal conductivity.
The external face 54 of the tubular portion is covered by a thermal protecting coating 56 having a thermal conductivity inferior to the conductivity mentioned above for the core of the shield, one of the preferred materials for said thermal coating being a tin alloy.
Also, the upper face 46 of the collar is covered by a fuel protecting coating 58 preventing direct fuel contacts between the copper alloy shied and fuel that may be present in the injector pocket 16. Although the materials of the thermal coating 56 and of the fuel protecting coating 58 may be chosen different from each other, having the same tin alloy for both coatings is preferred.
Alternatively, the surface coatings that are integral to the shield, one may prefer to arrange independent metallic sleeves fixed over the tubular portion and over the upper and peripheral faces of the shield 36.
Arranged for use as presented on the figure, the large actuator portion 28 occupies the large section of the injector pocket 16 and, the narrow nozzle 30 around which is press fitted the shield 36, is engaged with a clearance C of few tenths of millimeters in the small section portion 20 of the injector pocket. The collar 40 is axially Z compressed between the shoulder face 34 of the fuel injector and the shoulder face 24 of the injector pocket, the compression force being generated by a clamp, not shown, screwed on the top face of the engine block downwardly compressing the fuel injector inside the injector pocket. The thermal coating 56 limits the heat transfer from the vicinity of the combustion chamber 22 toward the nozzle 30 while the heat of the nozzle may be channeled by the tubular portion of the shield toward the collar then, through the contact between the under face of the collar to the injector pocket.
LIST OF REFERENCES
Z main axis
V internal volume of the injector pocket
C clearance
10 engine block
12 coolant gallery
14 opening
16 inj ector pocket
18 large section portion of the injector pocket
20 small section portion of the injector pocket
22 combustion chamber
24 shoulder face of the injector pocket
26 fuel injector
28 actuator member
30 nozzle
32 capnut
34 shoulder face of the fuel injector
36 shield
38 tubular portion of the shield
40 collar
42 open lower extremity of the shield
44 open upper extremity of the shield
46 upper face of the collar - first face
48 internal face of the tubular wall
50 peripheral face of the collar
52 under face of the collar - second face
54 external face of the tubular portion
56 thermal protecting coating
58 fuel protecting coating

Claims

1. Shield (36) adapted to be arranged between the nozzle (30) of a fuel injector (26) and an engine block (10), the shield (36) having a metallic body comprising a tubular portion (38) inside of which the cylindrical nozzle of the fuel injector can be press-fitted with interference and, that is able to be inserted with clearance (C) in a cylindrical hole of the engine block and,
the shield (56) further comprising a collar (40) forming a thick disc radially outwardly extending from an extremity of the tubular portion (38); the collar (40) having a first face (46), or upper face, an opposed second face (52), or under face, and, a peripheral face (50) joining the first face (46) to the second face (52);
the collar (40) being, in use, compressed between a shoulder face (34) of the fuel injector abutting against the first face (46) and, a shoulder face (24) provided in the engine block abutting against the second face (52) of the collar, characterized in that
the metallic body of the shield is made of copper alloy, the shield (36) further comprising a thermal protecting member (56) arranged over the external face (54) of the tubular portion and also a fuel protecting member (58) arranged over the peripheral face (50) of the collar.
2. Shield (36) as claimed in the preceding claim wherein the thermal protecting member (56) has a lower thermal conductivity than the metallic body.
3. Shield (36) as claimed in any one of the preceding claims wherein the thermal protecting member (56) is integral to the tubular portion.
4. Shield (36) as claimed in any one of the preceding claims wherein the thermal protecting member (56) is a coating of the external cylindrical face (54) of the tubular member.
5. Shield (36) as claimed in claim 4 wherein said coating (56) comprises tin.
6. Shield (36) as claimed in any one of the preceding claims wherein the fuel protecting member (58) further extends over the first face (46) of the collar.
7. Shield (36) as claimed in any one of the preceding claims wherein the fuel protecting member (58) is integral to the collar.
8. Shield (36) as claimed in claim 7 wherein the fuel protecting member (58) is a coating the collar.
9. Shield (36) as claimed in claim 8 wherein said coating comprises tin.
10. Shield (36) as claimed in the combination of claims 5 and 11 wherein the heat protecting coating (56) and the fuel protecting coating (58) are made of the same material.
11. Shield (36) as claimed in the combination of claims 5 and 9 wherein the heat protecting member (56) and the fuel protecting member (58) are made of different materials.
12. Fuel injector (26) having a cylindrical nozzle (30) for delivering fuel in a combustion chamber (22) of an internal combustion engine and, a shield (36) press-fitted over said cylindrical nozzle, the shield (36) being as claimed in any one of the preceding claims.
EP16781472.2A 2015-10-20 2016-10-14 Fuel injector nozzle shield Active EP3365549B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB1518531.7A GB201518531D0 (en) 2015-10-20 2015-10-20 Fuel injector nozzle shield
PCT/EP2016/074738 WO2017067855A1 (en) 2015-10-20 2016-10-14 Fuel injector nozzle shield

Publications (2)

Publication Number Publication Date
EP3365549A1 true EP3365549A1 (en) 2018-08-29
EP3365549B1 EP3365549B1 (en) 2019-12-11

Family

ID=55131304

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16781472.2A Active EP3365549B1 (en) 2015-10-20 2016-10-14 Fuel injector nozzle shield

Country Status (3)

Country Link
EP (1) EP3365549B1 (en)
GB (1) GB201518531D0 (en)
WO (1) WO2017067855A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020078817A1 (en) * 2018-10-17 2020-04-23 Robert Bosch Gmbh Injector arrangement

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11674486B2 (en) * 2019-12-02 2023-06-13 Cummins Inc. Groove injector nozzle combustion shield

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB719952A (en) * 1951-04-24 1954-12-08 Saurer Ag Adolph An improved fuel injection nozzle for diesel engines
GB2487588B (en) * 2011-01-28 2016-03-30 Gm Global Tech Operations Inc Thermal shield for a fuel injector of an internal combustion engine
US9410520B2 (en) * 2013-08-08 2016-08-09 Cummins Inc. Internal combustion engine including an injector combustion seal positioned between a fuel injector and an engine body
DE102013021261A1 (en) * 2013-12-14 2015-06-18 Daimler Ag Fuel injection nozzle for an internal combustion engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2020078817A1 (en) * 2018-10-17 2020-04-23 Robert Bosch Gmbh Injector arrangement
CN112912611A (en) * 2018-10-17 2021-06-04 罗伯特·博世有限公司 Injector assembly
CN112912611B (en) * 2018-10-17 2023-11-21 罗伯特·博世有限公司 Injector assembly

Also Published As

Publication number Publication date
EP3365549B1 (en) 2019-12-11
WO2017067855A1 (en) 2017-04-27
GB201518531D0 (en) 2015-12-02

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