EP1529955A1 - Moyens de serrage d'un injecteur de carburant - Google Patents

Moyens de serrage d'un injecteur de carburant Download PDF

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Publication number
EP1529955A1
EP1529955A1 EP03292784A EP03292784A EP1529955A1 EP 1529955 A1 EP1529955 A1 EP 1529955A1 EP 03292784 A EP03292784 A EP 03292784A EP 03292784 A EP03292784 A EP 03292784A EP 1529955 A1 EP1529955 A1 EP 1529955A1
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EP
European Patent Office
Prior art keywords
clamp
injector
fuel
clamping
rotation means
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Withdrawn
Application number
EP03292784A
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German (de)
English (en)
Inventor
Marc Frigo
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.)
Renault SAS
Original Assignee
Renault SAS
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 Renault SAS filed Critical Renault SAS
Priority to EP03292784A priority Critical patent/EP1529955A1/fr
Publication of EP1529955A1 publication Critical patent/EP1529955A1/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • the present invention relates to engines and in particular to an arrangement for clamping fuel injectors in place on an engine assembly.
  • EP-0848158 and-EP-0751290 are proposed arrangements for clamping down a plurality of injectors using a single clamp.
  • the clamp proposed in each case holds down its outer injectors using a forked end.
  • the present invention provides a clamp for securing a plurality of fuel injectors to an engine assembly, preferably onto a cylinder head thereof, said clamp comprising a longitudinally extending beam having at each end thereof an injector clamping member arranged in use to impart a clamping force onto a clamping portion associated with a said injector, said beam having defined therethrough and in between said clamping members at least one fixing hole adapted to receive an associated mechanical fixing for imparting said clamping force and the or each said fixing hole and said clamping members being substantially in-line with each other, characterised in that each said injector clamping member comprises a closed flange that in use completely surrounds a portion of its associated said fuel injector and in that each said closed flange is provided with at least one anti-rotation means that is arranged in use to engage with an anti-rotation means of said fuel injector.
  • the fuel injector hold-down clamp can be made lighter and narrower that some prior art arrangements.
  • the additional characterising feature of the anti-rotation means helps ensure that the injectors are optimally orientated within the closed flange and therefore on the cylinder head.
  • Said anti-rotation means of said clamp may be formed integrally with said closed flange.
  • Said anti-rotation means of said clamp may comprise a plurality of lugs, preferably evenly disposed around said closed flange and more preferably comprising a pair of said lugs.
  • Said anti-rotation means of said clamp may define at least one anti-rotation surface that faces inwards and complements said anti-rotation means formed on said injector.
  • Said anti-rotation means of said clamp may comprise at least one pair of inwardly facing lugs, each of which pair or pairs of lugs comprises anti-rotation surfaces in the form of inwardly facing and substantially parallel flat surfaces.
  • Said anti-rotation means of said clamp may be upstanding from said closed flange.
  • Said closed flange may comprise a substantially cylindrical collar adapted to impart a clamping force to its associated said injector by axially directed contact between said collar and said clamping portion.
  • Said clamp may comprise a double clamp for securing only two neighbouring said injectors to said engine assembly, said clamp preferably being formed by a casting or moulding technique and said fixing hole being defined through a boss disposed substantially in-line and half-way in between two neighbouring said closed flanges.
  • An upper portion of said fixing hole may be defined in the form of an at least partially spherical or countersunk recess, preferably adapted to accommodate in use a corresponding part spherical or countersunk washer or a part spherical or countersunk head of a said mechanical fixing.
  • the present invention also provides a method of fixing a pair of neighbouring fuel injectors into an in-use position on an engine, preferably a direct injection diesel engine and more preferably in between a pair of overhead camshafts thereof, the method including clamping said pair of neighbouring injectors into said in-use position using a clamp according to the present invention.
  • the present invention also provides a fuel injector for use in co-operation with a clamp according to the invention, said fuel injector comprising a body portion that includes anti-rotation means adapted to co-operate with said anti-rotation means of said clamp and further comprising captive means to enable captive assembly of said injector into said clamp, said body portion preferably housing a fuel metering means of said injector and said anti-rotation surfaces comprising a pair of outwardly facing, substantially flat and parallel surfaces formed integrally with said body portion.
  • the present invention also provides a fuel injection sub-assembly comprising a clamp according to the invention and having captured thereon, through each said closed flange thereof, first and second fuel injectors according to the invention.
  • the present invention also provides a method of producing a fuel injection sub-assembly according to the invention, the method including assembling said first and second fuel injectors into said closed flanges of said clamp and capturing each said injector onto said clamp by sliding onto each said injector a sleeve, preferably capturing each said sleeve onto its respective said injector using a captive member such as a snap or stop ring.
  • the present invention also provides an engine assembly including at least one clamp according to the present invention or at least one fuel injection sub-assembly according to the invention.
  • Said engine assembly may comprise a row of cylinders having disposed therealong a pair of overhead camshafts, the or each said clamp or sub-assembly being disposed in use in between and preferably substantially in parallel with said camshafts, said engine assembly preferably comprising a compression ignition internal combustion engine such as a common rail direct injection diesel engine suitable for use in a road-going vehicle.
  • an engine 10 will be considered as embodied in the non-limiting form of a compression ignition engine, preferably comprising a diesel engine suitable for use in a road-going vehicle such as a passenger car or light commercial vehicle.
  • the engine 10 may comprise one or more banks having defined therein multiple cylinders disposed substantially in-line.
  • the engine 10 will be considered in the form of an in-line arrangement having four cylinders 1-4.
  • the engine 10 includes a cylinder head 12 having double overhead camshafts (DOHC) 14 arranged in parallel along that cylinder head 12.
  • DOHC double overhead camshafts
  • the engine 10 preferably comprises a common-rail direct injection diesel engine and has a series of fuel injectors 16A-D that are fitted into the cylinder head 12 for injecting fuel directly into the cylinders 1-4.
  • the injectors 16A-D are disposed in between the DOHC 14 and substantially in-line and in parallel with those camshafts 14.
  • the injectors 16A-D are preferably substantially identical in construction, so as to benefit from commonality between parts and processes.
  • Each injector 16A-D comprises a tubular body assembly 18 having a fuel inlet and control portion 22 in the region of one end and a fuel nozzle 20 in the region of the opposite end, considered for convenience as the top end 22 and bottom end 20 respectively of the injector 16A-D.
  • each fuel injector 16A-D includes at its top end an electrical connector 220 and a fuel inlet 222 both projecting away from a fuel metering body 224.
  • the connector 220 is configured to connect to a wiring harness (not illustrated) via which harness and electrical connectors 220 fuel injection control signals are provided to control the flow of fuel through the fuel metering body 224.
  • the fuel metering body 224 includes a first part of an anti-rotation means that is arranged in use to co-operate with a corresponding second part of the anti-rotation means formed as part of an associated injector hold-down clamp 30A;B.
  • the part of the anti-rotation means formed on the injector 16A-D comprises a pair of flats 26A formed in opposite sides of the fuel metering body 224 and extending part way up the fuel metering body 220 from its lower end.
  • the flats 26A are preferably substantially parallel, so as to optimise anti-rotation load sharing, and may comprise cut-outs from the fuel metering body 224 formed by a pair of chords cutting across it for at least part of its length.
  • each fuel injector 16A-D steps inwards to a body section 24 of narrowed diameter.
  • the anti-rotation flats 26A may conveniently be substantially tangential to the diameter of this narrowed body section 24, which may help during assembly operations into the cylinder head 12.
  • this narrow body section 24 is bounded by an upper flange and a lower flange.
  • the upper flange comprises a lower face of the fuel metering portion 224 formed under the step downwards to the body portion 24 of narrowed diameter, the upper flange being less than fully round because of the cut-outs defined by the flats 26A.
  • the lower flange is formed by the top face of a clamping sleeve 28 that surrounds the narrowed injector body 24 and provides a circular and flat working surface at right angles to the injector centre line.
  • This sleeve 28 and flange arrangement may be referred to for convenience as that fuel injector's clamping portion and it is onto this lower flange that a clamping force is applied to clamp that injector 16A-D in place in the cylinder head 12.
  • the sleeve 28 may conveniently be slid onto the injector16A-D during assembly and captured in place using a snap ring 28A or equivalent means that would stop axial movement of the sleeve 28 in at least one direction.
  • a clamping sleeve 28 that is moveable relative to the injector body 24 during assembly of the injector 16A-D into the cylinder head 14 prevents a rotation hindering interconnection or seizure between the sleeve 28 and the injector 16A-D during assembly or clamping.
  • the injectors 16A-D are clamped down into position and are retained there in use by fuel injector hold-down clamps 30A, 30B, briefly referred to above but now dealt with in greater detail.
  • Each clamp 30A, 30B is adapted to clamp in place a pair of neighbouring injectors 16A-D.
  • a first clamp 30A clamps in place the injectors 16A, 16B for the first and second cylinders 1, 2 and a second clamp 30B clamps in place the injectors 16C, 16D for the third and fourth cylinders 3, 4.
  • Each clamp 30A, 30B comprises a longitudinally extending beam 32 having at the each end an injector clamping member 34.
  • the injector clamping members 34 are each embodied in the form of a closed flange that in use completely surrounds a portion 24 of its associated injector 16A-D.
  • the closed flange 34 preferably comprises a substantially cylindrical collar 34 that is adapted to impart a clamping force to its associated injector 16A-D by axially directed contact between the collar 34 and the sleeve 28 of the injector 16A-D. The clamping force would normally be expected to force the injector 16A-D towards the cylinder head 12.
  • the second part of the anti-rotation means is formed as part of the injector hold-down clamps 30A;B and, more particularly, this part is included as part of the closed flange 34.
  • the second part of the anti-rotation means comprises a pair of lugs 340 that extend upwardly from each closed flange 34.
  • the lugs 340 are preferably formed integrally with the closed flange 34 and, in the present embodiment, extend upwardly from it so as to compliment the configuration and disposition of the flats 26A forming the first part of the anti-rotation means.
  • the lugs 340 therefore comprise a pair of inward facing flats 26B that correspond to the flats 26A formed on the injector 16A-D.
  • the flats 26B on the hold-down clamps 30A;B are preferably spaced apart sufficiently to allow easy fitting of the injector 16A-D into the hold-down clamp 30A;B but not so far as to allow excessive sloppiness in the fit that might vary injector orientation in the fitted position.
  • the flats 26B are substantially parallel and tangential to the injector hole defined through the clamp ring 34.
  • the lugs 340 extend upwards so that their flats 26B at least partially overlap the flats 26A of the fuel metering portion 224, but preferably not so far up that they impinge on the fuel metering portion at the top of the cut out defined by the flats 26A of the fuel metering portion 224.
  • the relative orientation between the flats 26A on the injector 16A-D and the flats 26B of the lugs 340 on its clamping ring 34 dictates the orientation of the injector 16A-D when assembled into a subassembly with its hold-down clamp 30A;B and, more importantly, when that assembly 30A, 16A,B; 30B, 16C,D is assembled into the cylinder head 12.
  • the orientation of the injector 16A-D may ultimately dictate the orientation of the spray pattern from its nozzle 20, which can have significant effects on the introduction of fuel into the cylinders 1-4 and therefore on combustion and exhaust gas emissions.
  • the relative orientation between the two sets of flats 26A, 26B will also dictate the orientation of the connector 220 and also the approach angle of the fuel pipe, at least if the injector's fuel inlet 222 is angled away from the injector centreline.
  • the relative positioning of the flats 26A, 26B can therefore be used to impart both variation between installations of different applications and consistency among installations in the same production run, e.g. for one or both of nozzle spray pattern and connector orientation.
  • the collars 34 are preferably made with no great wall thickness with their outer circumference preferably not exceeding the maximum diameter of the injector 16A-D or more preferably its associated fuel metering body 224 and/or sleeve 28. This may be achieved because the collars 34 are closed and do not tend to splay open when the clamping load is applied.
  • the clamping load is preferably transmitted from the clamp 30A, 30B into the injector 16A-D by a substantially localised contact surface, e.g. via point loading lobes or knuckles 34A disposed on opposing undersides of each of the collars 34.
  • the closed flanges 34 preferably closely and completely encircle their respective injectors 16A-D, leaving a clearance only sufficient to avoid pinching or hindering the injector 16A-D during storage, fitting or operation and across its operating temperature range.
  • the beam 32 is preferably of a narrower width/thickness than the injectors 16A-D and/or narrower than the collars 34.
  • the reduced width is possible because there is no longer any need to provide thick and wide fork legs for clamping purposes. This again provides improved packaging, in particular between the DOHC 14, and leads also to a light weight.
  • the lugs 340 on the hold-down clamps 30A;B can therefore also be kept to a correspondingly small size, whilst still providing adequate anti-rotation properties for the loads they take directly.
  • the clamps 30A, 30B are each provided with means to introduce the clamping force into their respective pairs of injectors 16A,B; 16C,D.
  • the clamping force may conveniently and cheaply be provided by a mechanical fixing such as a bolt or machine screw 36.
  • Other mechanical fastening systems can be used, such as a stud and nut arrangement.
  • the mechanical fixing arrangement may also be captive on the clamp 30A, 30B so as to benefit from the possibility of sub-assembly, to keep down the parts count on the production line and to keep down the risk of a fitter dropping loose parts into a cam valley between the DOHC 14.
  • the clamps 30A, 30B, including their lugs 340, may be formed using a casting or moulding technique and preferably include a dimensionally enlarged portion adapted to co-operate with such a mechanical fixing 36.
  • This may take the form of a boss 38 that both defines a hole 40 therethrough and is adapted to provide on an upper surface 42 thereof a region through which that mechanical fixing 36 can act.
  • the boss 38 is preferably disposed substantially in-line and halfway in between two neighbouring collars 34.
  • An upper portion of the fixing hole 40 is defined in the form of an at least partially spherical and/or countersunk recess 40A, preferably adapted to accommodate in use a part spherical or countersunk washer or a part spherical or countersunk head of the mechanical fixing 36.
  • the clamps 30A,B; 30C,D are fitted to their respective injector pairs 16A,B; 16C,D by sliding the injectors 16A,B; 16C,D through the collars 34 and then sliding the sleeves 28 onto the injector body below the clamp 30A, 30B and capturing the diverse parts 16A,D, 34, 28 together by fitting their respective snap/stop rings 28A.
  • the injector 16A-D is captured in the hold-down clamp 30A,B between, on one side, the upper end of the cut-outs defined by the flats 26A of the fuel metering portion and, on the other side, the top surface of the sleeve 28.
  • the interaction between these features means that there is a reduced likelihood of the mechanical fixing 36 from being worked loose by twist of the clamp 30A, 30B or by vibration coming up through the injectors 16A-D. Any turning moment of one injector 16A,C about the fixing 36 is blocked by the presence on the other end of the clamp 30A, 30B of the other injector 16B,D.
  • the injectors 16A-D By fitting the injectors 16A-D to the clamps 30A, 30B in pairs 16A,B; 16C,D, the parts count at the side of the production line is reduced as they can be supplied already assembled as sub assemblies 30A, 16A,B; 30B, 16C,D.
  • the parts counts being optionally still further reduced if a captive mechanical fixing 36 is employed.
  • This allows a simpler method of clamping the injectors 16A-D in place on the engine 10, in particular between a pair of DOHC 14 and preferably substantially in parallel therewith, where the reduced width of the clamps 30A, 30B provides more handling room and lighter weight.
  • servicing and parts exchange is also made easier.
  • the fuel injection sub-assemblies 30A, 16A,B; 30B, 16C,D there is also a reduced risk of encountering assembly problems such as those associated with dropping loose parts into camshaft valleys.
  • Configurations using the present invention are possible in which, depending on installation constraints or engine configuration, clamping arrangements may be used other than only the double clamps of the non-limiting embodiment described above.
  • clamping arrangements may be used other than only the double clamps of the non-limiting embodiment described above.
  • a V-6 or indeed any engine having an odd number of cylinders in line using only double injector clamp may prove inconvenient.
  • it will be apparent to the skilled man that it is possible to extend the double clamp to form a triple, each collar having included with it the anti-rotation lugs.
  • Such an arrangement would preferably include a boss and mechanical fixing between each pair of neighbouring injectors.
  • a single collar version can also be envisaged for use in co-operation with clamps having even numbers of collars, although such an arrangement might prove less resistant to twisting of the whole assembly than a multi-injector version.
  • the present invention can therefore be seen to reduce parts count line-side, reduce overall weight, reduce injector packaging problems and it simplifies assembly procedures. This therefore overcomes or at least alleviates certain problems with some known arrangements for clamping engine fuel injectors in place. In doing so and importantly, the anti-rotation arrangement 26A,B, 340 can be used to ensure consistent alignment of one or more of the injector spray pattern, connectors 220 and fuel inlets 222.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP03292784A 2003-11-06 2003-11-06 Moyens de serrage d'un injecteur de carburant Withdrawn EP1529955A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03292784A EP1529955A1 (fr) 2003-11-06 2003-11-06 Moyens de serrage d'un injecteur de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03292784A EP1529955A1 (fr) 2003-11-06 2003-11-06 Moyens de serrage d'un injecteur de carburant

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EP1529955A1 true EP1529955A1 (fr) 2005-05-11

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007009839A1 (fr) * 2005-07-15 2007-01-25 Robert Bosch Gmbh Dispositif de retenue
JP2016145576A (ja) * 2015-02-07 2016-08-12 ネアンダー モーターズ アクチエンゲゼルシャフトＮＥＡＮＤＥＲ ＭＯＴＯＲＳ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ 少なくとも１つの燃料噴射ノズルを固定するための装置

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4096998A (en) * 1976-04-30 1978-06-27 Warszawskie Zaklady Mechaniczne Pzl-Wzm Fuel injector
US4133321A (en) * 1972-12-21 1979-01-09 Robert Bosch Gmbh Clamping device for fuel injection nozzles
US4246877A (en) * 1979-07-27 1981-01-27 General Motors Corporation Notched injector hold-down clamp
GB2145469A (en) * 1983-08-27 1985-03-27 Lucas Ind Plc I.C. engine fuel injector assembly
US4901700A (en) * 1982-11-27 1990-02-20 Perkins Engines Group Limited Clamp for an internal combustion engine fuel injector
EP0751290A1 (fr) * 1995-06-26 1997-01-02 Isuzu Motors Limited Structure de fixation d'une tuyère d'injection de combustible
EP0848158A1 (fr) * 1996-12-13 1998-06-17 Isuzu Motors Limited Moteur à plusieurs cylindres du type à injection directe
US6062200A (en) * 1996-09-26 2000-05-16 Robert Bosch Gmbh Motor fuel dispenser
EP1046810A2 (fr) * 1999-04-20 2000-10-25 Siemens Automotive Corporation Dispositif de montage d'injecteurs de carburant
US6178950B1 (en) * 1997-06-11 2001-01-30 Caterpillar Inc. Noise reducing bracket for a fuel injection system
US20020152994A1 (en) * 2000-06-30 2002-10-24 Rainer Kurtenbach Piston internal combustion engine comprising a deflection-resistant cross brace for sealingly fixing fuel injection devices
US20030101969A1 (en) * 2000-09-01 2003-06-05 Albrecht Baessler Clamping element for a fuel injection valve and fuel injection system

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4133321A (en) * 1972-12-21 1979-01-09 Robert Bosch Gmbh Clamping device for fuel injection nozzles
US4096998A (en) * 1976-04-30 1978-06-27 Warszawskie Zaklady Mechaniczne Pzl-Wzm Fuel injector
US4246877A (en) * 1979-07-27 1981-01-27 General Motors Corporation Notched injector hold-down clamp
US4901700A (en) * 1982-11-27 1990-02-20 Perkins Engines Group Limited Clamp for an internal combustion engine fuel injector
GB2145469A (en) * 1983-08-27 1985-03-27 Lucas Ind Plc I.C. engine fuel injector assembly
EP0751290A1 (fr) * 1995-06-26 1997-01-02 Isuzu Motors Limited Structure de fixation d'une tuyère d'injection de combustible
US6062200A (en) * 1996-09-26 2000-05-16 Robert Bosch Gmbh Motor fuel dispenser
EP0848158A1 (fr) * 1996-12-13 1998-06-17 Isuzu Motors Limited Moteur à plusieurs cylindres du type à injection directe
US6178950B1 (en) * 1997-06-11 2001-01-30 Caterpillar Inc. Noise reducing bracket for a fuel injection system
EP1046810A2 (fr) * 1999-04-20 2000-10-25 Siemens Automotive Corporation Dispositif de montage d'injecteurs de carburant
US20020152994A1 (en) * 2000-06-30 2002-10-24 Rainer Kurtenbach Piston internal combustion engine comprising a deflection-resistant cross brace for sealingly fixing fuel injection devices
US20030101969A1 (en) * 2000-09-01 2003-06-05 Albrecht Baessler Clamping element for a fuel injection valve and fuel injection system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2007009839A1 (fr) * 2005-07-15 2007-01-25 Robert Bosch Gmbh Dispositif de retenue
JP2016145576A (ja) * 2015-02-07 2016-08-12 ネアンダー モーターズ アクチエンゲゼルシャフトＮＥＡＮＤＥＲ ＭＯＴＯＲＳ Ａｋｔｉｅｎｇｅｓｅｌｌｓｃｈａｆｔ 少なくとも１つの燃料噴射ノズルを固定するための装置

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