EP1493916A1 - Bride de fixation pour des injecteurs à combustible des moteurs à combustion interne - Google Patents

Bride de fixation pour des injecteurs à combustible des moteurs à combustion interne Download PDF

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Publication number
EP1493916A1
EP1493916A1 EP03291630A EP03291630A EP1493916A1 EP 1493916 A1 EP1493916 A1 EP 1493916A1 EP 03291630 A EP03291630 A EP 03291630A EP 03291630 A EP03291630 A EP 03291630A EP 1493916 A1 EP1493916 A1 EP 1493916A1
Authority
EP
European Patent Office
Prior art keywords
clamp
injector
clamping
injectors
engine
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Withdrawn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
EP03291630A
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German (de)
English (en)
Inventor
Marc Frigo
Philippe Mallet
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 EP03291630A priority Critical patent/EP1493916A1/fr
Publication of EP1493916A1 publication Critical patent/EP1493916A1/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Withdrawn legal-status Critical Current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.
  • 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.
  • Said fixing hole may be 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 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 injection sub-assembly comprising a clamp according to the present invention and having captured thereon, through each said closed flange thereof, first and second fuel injectors.
  • the present invention also provides a method of producing a fuel injection sub-assembly according to the present invention, the method including assembling a pair of injectors into said closed flanges of said clamp and capturing said injectors 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 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 present invention.
  • Said engine assembly may comprises 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.
  • 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 is 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 nozzle 20 in the region of one end and a fuel inlet portion 22 in the region of the opposite end, referred to for convenience as the top and bottom ends of the injector 16A-D.
  • its body assembly 18 includes an annular portion that steps inwards to a body section 24 of narrowed diameter. This narrow body section is bounded by an upper flange 26 and a lower flange.
  • the lower flange forms part of a clamping sleeve that surrounds the injector body 18, 24 and the lower flange provides a circular and flat working surface at right angles to the injector centre line.
  • This arrangement may be referred to for convenience as that fuel injector's clamping portion 28 and is where a clamping force is applied to clamp that injector 16A-D in place in the cylinder head 12.
  • the sleeve may be slid onto the injector during assembly and captured in place using a snap ring 28A or equivalent that would stop axial movement of the sleeve 28 in at least one direction and thereby preferably also provide an operative interconnection between the sleeve 28 and the injector 16A-D.
  • the injectors 16A-D are clamped down into position and are retained there in use by fuel injector hold-down clamps 30A, 30B.
  • 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 clamping portion 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 collars 34 may be 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 clamping portion 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 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 cab 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 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 36A 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 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.
  • 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.
  • 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 to be used in co-operation with clamps having even numbers of collars.
  • 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.

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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)
EP03291630A 2003-07-02 2003-07-02 Bride de fixation pour des injecteurs à combustible des moteurs à combustion interne Withdrawn EP1493916A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP03291630A EP1493916A1 (fr) 2003-07-02 2003-07-02 Bride de fixation pour des injecteurs à combustible des moteurs à combustion interne

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP03291630A EP1493916A1 (fr) 2003-07-02 2003-07-02 Bride de fixation pour des injecteurs à combustible des moteurs à combustion interne

Publications (1)

Publication Number Publication Date
EP1493916A1 true EP1493916A1 (fr) 2005-01-05

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EP03291630A Withdrawn EP1493916A1 (fr) 2003-07-02 2003-07-02 Bride de fixation pour des injecteurs à combustible des moteurs à combustion interne

Country Status (1)

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EP (1) EP1493916A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1698778A1 (fr) * 2005-03-01 2006-09-06 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Culasse pour un moteur à combustion interne à injection directe avec un griffe pour deux soupapes d'injection
FR2935754A3 (fr) * 2008-09-08 2010-03-12 Renault Sas Dispositif de fixation d'un injecteur de carburant dans une douille engagee a l'interieur d'un puits d'un bloc moteur
GB2546500A (en) * 2016-01-19 2017-07-26 Perkins Engines Co Ltd Injector clamp

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB875438A (en) * 1959-03-20 1961-08-23 Daimler Benz Ag New or improved thermally insulating means for mounting injection nozzles on an internal combustion engine
US4290394A (en) * 1980-03-07 1981-09-22 Brunswick Corporation Two-cycle engine with fuel injection
DE19521363C1 (de) * 1995-06-12 1996-09-05 Daimler Benz Ag Vorrichtung zur Befestigung eines Einspritzdüsenhalters
EP0735267A2 (fr) * 1995-03-30 1996-10-02 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif de fixation d'un injecteur en particulier sur la culasse de cylindre d'un moteur à combustion interne
EP0751290A1 (fr) * 1995-06-26 1997-01-02 Isuzu Motors Limited Structure de fixation d'une tuyère d'injection de combustible
EP0774579A1 (fr) * 1995-11-17 1997-05-21 Automobiles Peugeot Dispostif pour la fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB875438A (en) * 1959-03-20 1961-08-23 Daimler Benz Ag New or improved thermally insulating means for mounting injection nozzles on an internal combustion engine
US4290394A (en) * 1980-03-07 1981-09-22 Brunswick Corporation Two-cycle engine with fuel injection
EP0735267A2 (fr) * 1995-03-30 1996-10-02 Bayerische Motoren Werke Aktiengesellschaft, Patentabteilung AJ-3 Dispositif de fixation d'un injecteur en particulier sur la culasse de cylindre d'un moteur à combustion interne
DE19521363C1 (de) * 1995-06-12 1996-09-05 Daimler Benz Ag Vorrichtung zur Befestigung eines Einspritzdüsenhalters
EP0751290A1 (fr) * 1995-06-26 1997-01-02 Isuzu Motors Limited Structure de fixation d'une tuyère d'injection de combustible
EP0774579A1 (fr) * 1995-11-17 1997-05-21 Automobiles Peugeot Dispostif pour la fixation d'un injecteur de carburant sur une culasse de moteur à combustion interne

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1698778A1 (fr) * 2005-03-01 2006-09-06 Dr.Ing. h.c.F. Porsche Aktiengesellschaft Culasse pour un moteur à combustion interne à injection directe avec un griffe pour deux soupapes d'injection
US7412970B2 (en) 2005-03-01 2008-08-19 Dr. Ing. H.C.F. Porsche Aktiengesellschaft Cylinder head for a direct injection internal combustion engine
FR2935754A3 (fr) * 2008-09-08 2010-03-12 Renault Sas Dispositif de fixation d'un injecteur de carburant dans une douille engagee a l'interieur d'un puits d'un bloc moteur
GB2546500A (en) * 2016-01-19 2017-07-26 Perkins Engines Co Ltd Injector clamp
US10041458B2 (en) 2016-01-19 2018-08-07 Perkins Engines Company Limited Injector clamp
GB2546500B (en) * 2016-01-19 2019-07-24 Perkins Engines Co Ltd Reversible injector clamp

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