EP0751290B1 - Fuel injection nozzle clamping structure - Google Patents

Fuel injection nozzle clamping structure Download PDF

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Publication number
EP0751290B1
EP0751290B1 EP96109928A EP96109928A EP0751290B1 EP 0751290 B1 EP0751290 B1 EP 0751290B1 EP 96109928 A EP96109928 A EP 96109928A EP 96109928 A EP96109928 A EP 96109928A EP 0751290 B1 EP0751290 B1 EP 0751290B1
Authority
EP
European Patent Office
Prior art keywords
nozzle
fuel injection
clamp
clamping structure
nozzles
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.)
Expired - Lifetime
Application number
EP96109928A
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German (de)
English (en)
French (fr)
Other versions
EP0751290A1 (en
Inventor
Haruyoc/O Isuzu Motors Limited Kimura
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.)
Isuzu Motors Ltd
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Isuzu Motors Ltd
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Filing date
Publication date
Application filed by Isuzu Motors Ltd filed Critical Isuzu Motors Ltd
Publication of EP0751290A1 publication Critical patent/EP0751290A1/en
Application granted granted Critical
Publication of EP0751290B1 publication Critical patent/EP0751290B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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

  • This invention relates to a fuel injection nozzle clamping structure for internal combustion engines, and more particularly to a fuel injection nozzle clamping structure adapted to clamp three fuel injection nozzles, which constitute one set of fuel injection nozzles, by one nozzle clamp and fix the same to a cylinder head.
  • Known means for fixing a fuel injection nozzle for an internal combustion engine to a cylinder head include, for example, a means in which a nozzle clamp is provided in the form of a beam between a fuel injection nozzle and a cylinder head, an intermediate portion of which clamp is tightened and fixed by bolts and nuts as disclosed in Japanese Patent Laid-Open No. 182680/1991.
  • the fuel injection nozzle is fixed to a cylinder head by cutting both side surfaces of the fuel injection nozzle to form clamp receiving seats, inserting the resultant fuel injection nozzle into a nozzle setting bore made in the cylinder head, fitting a bifurcated support portion, which is formed at one end of a nozzle clamp, in the clamp receiving seats, inserting a stud bolt, which is fixed to the cylinder head, into a bolt hole formed in an intermediate portion of the nozzle clamp, and screwing a nut on this bolt with the other end of the nozzle clamp engaged with the clamp receiving seats formed on the cylinder head.
  • Such a fuel nozzle clamping structure formed so that a fuel nozzle is clamped by supporting a fuel injection nozzle on one end portion of a nozzle clamp, and fastening an intermediate portion of the nozzle clamp by tightening a stud bolt with the other end portion of the nozzle clamp supported on the clamp receiving seats on the cylinder head, has construction for sealing the fuel injection nozzle by applying a reliable pressing force thereto in accordance with a vertical position of the clamp receiving seats on the fuel injection nozzle.
  • width across flat clamp receiving seats 4 is formed by cutting both side surfaces of an intermediate portion of a fuel injection nozzle 1, and a clamp receiving seat 5 is further formed on an upper surface of a cylinder head 2.
  • This fuel injection nozzle 1 is inserted into a nozzle setting bore 3 made in the cylinder head 2, and a bifurcated portion formed at one end of a nozzle clamp 6 is fitted in the width across flat clamp receiving seats 4 of the fuel injection nozzle 1.
  • a clamping bolt 7 fixed to the cylinder head 2 is inserted into a bolt hole 8 provided in an intermediate portion of the nozzle clamp 6, and a nut 10 with a spherical washer 12 applied thereto is screwed on the portion of this stud bolt 7 which projects from the bolt hole 8.
  • the nozzle clamp 6 in this condition is fixed with the clamp receiving seats 4, 5 pressed by the lower surfaces of cross-sectionally arcuately formed contact parts 9 of the bifurcated portion of the nozzle clamp and a contact part thereof at the opposite side of this bifurcated portion respectively, whereby a free end portion of the fuel injection nozzle 1 is fixed with a sealing load imparted to a nozzle packing 11.
  • the spherical washer 12 receiving the force of the nut 10 and pressing the nozzle clamp 6, is provided so as to offset a small height difference between the clamp receiving seats 4, 5 and impart a predetermined sealing load to the fuel injection nozzle 1.
  • nozzle clamping structure of Fig. 7 is not suitable for the miniaturization of an engine.
  • a both end-supported type fuel injection nozzle clamping structure shown in Figs. 8 and 9 has been proposed as another type of fuel injection nozzle clamping structure.
  • two fuel injection nozzles are fixed by both end portions of one nozzle clamp 6.
  • bifurcated nozzle contact portions 9 are formed at both ends of the nozzle clamp 6, and a bolt insert hole 8 in an intermediate portion thereof.
  • the nozzle clamp 6 is inserted into a clamping bolt 7 fixed to a stud boss 13 formed on a cylinder head 2, and a nut 10 with a spherical washer 12 applied thereto is screwed on a conical seat formed on an upper surface of the bolt insert hole 8, to tighten the nozzle clamp, whereby a sealing load is imparted to a nozzle packing.
  • a sealing load is imparted to a nozzle packing.
  • each bank has three cylinders, and, when the both end-supported type nozzle clamp shown in Fig. 8 is used for each two adjacent fuel injection nozzles therein, the one end-supported type nozzle clamp shown in Fig. 7 has to be used for the remaining one fuel injection nozzle.
  • a fuel injection nozzle clamping structure of the kind defined in the preamble of independent claim 1 is known from EP-A-0.491.582.
  • the present invention has been developed with attention given to the problems with a conventional fuel injection nozzle clamping structure for an engine, and aims at providing a fuel injection nozzle clamping structure for an internal combustion engine which is adapted to fix together three series-arranged fuel injection nozzles by one nozzle clamp.
  • the fuel injection nozzle clamping structure according to the present invention for achieving the object, applied to an engine having series arranging three fuel injection nozzles inserted into nozzle fixing bores in a cylinder head, comprises a nozzle clamp having three contacting portions aligned with the clamp receiving seats which are formed on the fuel injection nozzles, and having bolt inserted holes between the contacting portions, and clamping bolts inserted into the insert holes so as to press the fuel injection nozzles and impart sealing loads thereto.
  • the intermediate fuel injection nozzle is tightened by two clamping bolts, so that the tightening force applied to this intermediate fuel injection nozzle becomes larger than that applied to the fuel injection nozzles on both sides.
  • the tightening force applied to a fuel injection nozzle is set not higher than a predetermined level, the sealing performance of the nozzle packing lowers.
  • this tightening force is set not lower than a predetermined level, the lifting action of a needle valve cannot be made smoothly, i.e., a so-called "slowdown" of a needle valve occurs.
  • the tightening force of the fuel injection nozzles can be set uniform by suitably selecting the shape of the nozzle clamp and the positions of the clamping bolts.
  • the sizes of the clamp receiving seats on the fuel injection nozzles and nozzle contacting portions of the nozzle clamp are set so that a clearance occurs between the nozzle contacting portions formed at an intermediate part of the nozzle clamp and the clamp receiving seat formed on the intermediate fuel injection nozzle when the nozzle clamp is placed on the three fuel injection nozzles.
  • the nozzle clamp When a predetermined level of tightening force is applied to the nozzle clamp by the clamping bolts, the nozzle clamp is bent, and the intermediate nozzle contacting portions engage the corresponding clamp receiving seat.
  • the tightening force applied to the fuel injection nozzles can be set uniform by further tightening the nozzle clamp so as to impart a sealing load to the three nozzle packings.
  • the fuel injection nozzle clamping structure described above can be suitably applied to a four-valve engine but the engine to which the present invention is applied is not limited to this engine.
  • the present invention can also be applied to other types of internal combustion engines as long as they are provided with three series-arranged nozzles 1.
  • the above-mentioned means formed so as to tighten three series-arranged fuel injection nozzles by one nozzle clamp enables the performance and weight of an internal combustion engine to be improved and reduced respectively, and a space in which a nozzle clamp is fixed to be secured when the engine is miniaturized.
  • the fuel injection nozzle clamping structure in this embodiment is applied to a 6-cylinder V-type engine.
  • fuel injection nozzles 1 are inserted into nozzle fixing bores 3 of nozzle fixing sleeves 3a press-fitted in a cylinder head 2, and three nozzles are thus arranged in series in each bank.
  • the two cam shafts 15 shown in the drawings are held between a cam carrier 16 fixed to the cylinder head 2 and a cam bracket 17.
  • a reference numeral 18 shown in Fig. 3 denotes a path of a cam nose.
  • clamp receiving seats 4 are formed on both sides of the fuel injection nozzle 1.
  • one nozzle clamp 19 is disposed on three clamp receiving seats 4 provided on both sides of three fuel injection nozzles 1, in a bridge spanning manner.
  • the clamping bolts 7 fixed between adjacent fuel injection nozzles 1 are then inserted into bolt insert holes 8, and spherical washers 12 are provided in conical recesses 8b in the nozzle clamp 19 at the end portions of these clamping bolts 7.
  • Nuts 10 are screwed on the clamping bolts 7, which are thereby tightened so as to press the nozzle packings 11 at the free end portions of the fuel injection nozzles 1 and impart a sealing load thereto.
  • the nozzle clamp 19 which presses three fuel injection nozzles 1 at once is made from a spring material, and shaped as shown in Figs. 5 and 6. Namely, the nozzle clamp 19 has bifurcated nozzle contacting portions 9 at both ends, nozzle contacting portions 20 at both sides of an intermediate through hole 20a, and large-thickness portions 21 having bolt insert bores 8 and extending between the nozzle contacting portions 9, 20.
  • the cross-sectional shape of the nozzle clamp 19 is as shown in Fig. 6.
  • the portions of the nozzle clamp 19 which are provided with the bolt insert holes 8 are formed as the large-thickness parts 21 to heighten the rigidity thereof, and the nozzle contacting portions 9 at both ends are formed to a thickness slightly smaller than that of the large-thickness parts 21 and bent downward so as to increase the elasticity thereof.
  • the lower circumferential edges 8a of the bolt insert holes 8 are recessed so as to lessen the concentration of stress in the lower end opened portions of the holes, and conical recesses 8b are formed at the upper side of the holes 8 so that the recesses 8b receive the spherical washers 12 easily.
  • the clamp receiving seats 4 of the three fuel injection nozzles 1 are formed to the same height.
  • a lower surface 20b of the intermediate nozzle contacting portions 20 are formed higher than a line (a lower surface 21a of each large-thickness portion 21) connecting together the nozzle contacting portions 9 at both sides so that a clearance t' occurs therebetween, i.e., the clearance t' is provided so that the nozzle contacting portions 9, 9 at both sides and the intermediate nozzle contacting portions 20 do not simultaneously engage the three clamp receiving seats 4 of the three fuel injection nozzles 1.
  • the present invention provides a nozzle clamping structure having one clamp 19 provided with nozzle contacting portions 9, 20, 9 with respect to the clamp receiving seats 4 of three fuel injection nozzles, these nozzle contacting portions 9, 20, 9 being aligned at once with the three clamp receiving seats 4 and tightened by bolts, whereby the three fuel injection nozzles can be pressed and fixed by a uniform level of force.
  • the characteristics of the nozzle clamping structure according to the present invention reside in that it is formed so that the nozzle clamp works as a both-end supported beam in a first stage of a bolt tightening operation, and as a three-point supported beam in a second stage thereof in which the bolts are further tightened.
  • this single nozzle clamp 19 which is formed so that a clearance t' occurs between the nozzle contacting portions 20 and nozzle contacting portions 9, 9 as shown in Fig. 6, obtained when the three fuel injection nozzles 1 are pressed and fixed at once by using the same nozzle clamp 19 will now be described.
  • a three-point supported beam supported simultaneously at three points, in which concentrated loads (W 1 , W 2 ) are imparted to intermediate portions (k 1 ⁇ L 1 , k 2 ⁇ L 2 , wherein 0 ⁇ k ⁇ 1) of a continuous beam (nozzle clamp 19) having inter-fulcrum length L 1 , L 2 and supported on three fulcrums A, B, C will be described.
  • the continuous beam is regarded as a simple beam including a beam having fulcrums A, B only and a beam having fulcrums B, C, and the reaction force R A , R B , R C occurring in these fulcrums can be determined on the basis of a 3-moment theorem of the strength of materials in which the bending moment at these fulcrums is handled as M A , M B , M C and an expression obtained from the balance of the bending moment (refer to, for example, "Exercise in Strength of Materials” written by Seiroku Koi, pages 106-109, issued on October 15, 1963 by the Gakkensha).
  • fulcrums A, B, C shown in Fig. 1 can be replaced by the positions of the clamp receiving seats 4 on the fuel injection nozzles 1 shown in Fig. 4, and Fig. 2 illustrates a case where clamp receiving seats a, b, c are arranged at regular intervals in the same manner as the fulcrums A, B, C shown in Fig. 1, with a tightening force P of bolts applied to the respective central portions.
  • Fig. 2 shows the principle of operation of the nozzle clamping structure according to the present invention.
  • tightening force Fa, Fc is exerted on the clamp receiving seats a , c alone in a first tightening stage, in which a load P is imparted to a three-point supported nozzle clamp 19 as shown in Fig. 4 by screwing a nut 10 to a stud bolt 7, so that the nozzle clamp 19 functions as a simple both-end supported beam.
  • Ka, Kc equal the spring constants of the nozzle clamp 19 in this case. Consequently, the tightening force Fa, Fc which the clamp receiving seats a , c receive with respect to the deflection t becomes as expressed by a straight line (1) in Fig. 2B.
  • the tightening force Fb exerted on the clamp receiving seat b is larger than that Fa, Fc exerted on the clamp receiving seats a , c as previously described with reference to Fig. 1.
  • the spring constants Ka', Kc' with respect to the clamp receiving seats a , c become larger than those Ka, Kc (Ka', Kc'>Ka, Kc), which are in the case where the tightening force is as shown by the straight line 1 ⁇ , i.e., as shown by a straight line 2 ⁇ in Fig. 2B.
  • the spring constant Kb of the nozzle clamp 19 with respect to the clamp receiving seat b is larger than those Ka', Kc' with respect to the clamp receiving seats a, c (Kb>Ka', Kc'), i.e., increases about four times as described previously.
  • the deflection amount t of the nozzle clamp 19 further increases, so that the tightening force Fa, Fb, Fc applied to the clamp receiving seats a , b , c increases.
  • the angle of inclination of a straight line 3 ⁇ showing an increase in the tightening force Fb applied to the clamp receiving seat b is larger than that of the straight line 2 ⁇ showing an increase in the tightening force Fa, Fc applied to the clamp receiving seats a , c , so that a deflection amount t'' at which the two straight lines 2 ⁇ , 3 ⁇ cross each other exists.
  • the three fuel injection nozzles can be tightened by one nozzle clamp by three equal tightening force Fa, Fb, Fc.
  • nozzle clamp 19 thus formed enables three series-arranged fuel injection nozzles 1 to be tightened at once by equal tightening force Fa, Fb, Fc, a decrease in the sealability and a "slowdown" in which the movement of the needle valve being lifted becomes slow do not occur. Accordingly, a desirable engine performance can be obtained.
  • the fuel injection nozzle clamping structure according to the present invention is formed so that a set of three nozzles are fixed at once by one nozzle clamp. Therefore, the securing of a space for installing the fuel injection nozzle clamping structure can be done easily, so that the present invention can be applied suitably to a 6-cylinder V-type 4-valve engine in which the reduction of the dimensions and weight and the improvement of the performance have been achieved, and to an engine in which the securing of a nozzle clamp installation space is difficult, especially, a miniaturized engine.
  • the invention defined in Claim 2 which is formed so that, when the nozzle clamp is placed on the clamp receiving seats, a clearance occurs between the intermediate nozzle contacting portion and clamp receiving seats so as to operate the nozzle clamp as a two-point supported beam in a first tightening stage, and as a three-point supported beam in a second tightening stage, is capable of easily setting equal the tightening loads imparted to the three nozzles constituting one set nozzles. This can easily prevent the occurrence of imperfect sealing of nozzle packings and a slowdown of the needle valve being lifted.

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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)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
EP96109928A 1995-06-26 1996-06-20 Fuel injection nozzle clamping structure Expired - Lifetime EP0751290B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP15957195 1995-06-26
JP7159571A JP2937081B2 (ja) 1995-06-26 1995-06-26 燃料噴射ノズルの締付け装置
JP159571/95 1995-06-26

Publications (2)

Publication Number Publication Date
EP0751290A1 EP0751290A1 (en) 1997-01-02
EP0751290B1 true EP0751290B1 (en) 2000-03-22

Family

ID=15696632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96109928A Expired - Lifetime EP0751290B1 (en) 1995-06-26 1996-06-20 Fuel injection nozzle clamping structure

Country Status (3)

Country Link
EP (1) EP0751290B1 (ja)
JP (1) JP2937081B2 (ja)
DE (1) DE69607248T2 (ja)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053235A2 (de) 2007-10-23 2009-04-29 Volkswagen Aktiengesellschaft Brennkraftmaschine mit Kraftstoffinjektoren
DE102008063645A1 (de) 2008-12-18 2010-06-24 Volkswagen Ag Brennkraftmaschine mit Spannpratze für Kraftstoffeinspritzvorrichtung
EP3945206A1 (de) 2020-07-30 2022-02-02 DEUTZ Aktiengesellschaft Injektorverpratzung

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2921459B2 (ja) * 1995-11-24 1999-07-19 いすゞ自動車株式会社 エンジンのインジェクタ取付構造
JP2877117B2 (ja) * 1996-12-13 1999-03-31 いすゞ自動車株式会社 直噴式多気筒エンジン
US5806494A (en) * 1997-08-06 1998-09-15 Caterpillar Inc. Hydraulically actuated fuel injection system with integrated actuation fluid rail and injectors
JP2000145580A (ja) 1998-11-11 2000-05-26 Isuzu Motors Ltd インジェクタの固定構造
EP1079100B1 (en) * 1999-08-27 2005-12-21 Delphi Technologies, Inc. Connector arrangement
DE10032003A1 (de) 2000-06-30 2002-01-10 Fev Motorentech Gmbh Kolbenbrennkraftmaschine mit biegesteifem Joch zur abdichtenden Befestigung von Kraftstoffeinspritzeinrichtungen
DE10112142A1 (de) 2001-03-14 2002-09-19 Bosch Gmbh Robert Brennstoffeinspritzventil
KR20020085011A (ko) * 2001-05-04 2002-11-16 현대자동차주식회사 디젤엔진의 인젝터 클램프용 볼트
GB0312406D0 (en) * 2003-05-29 2003-07-02 Delphi Tech Inc Injector assembly
EP1493916A1 (en) * 2003-07-02 2005-01-05 Renault s.a.s. Engine fuel injector clamping
EP1529955A1 (en) * 2003-11-06 2005-05-11 Renault s.a.s. Fuel injector clamping means
DE102005009118A1 (de) * 2005-03-01 2006-09-14 Dr.Ing.H.C. F. Porsche Ag Zylinderkopf für eine direkteinspritzende Brennkraftmaschine
DE102008025744B4 (de) 2008-05-29 2015-12-17 Volkswagen Ag Brennkraftmaschine mit Spannpratze für Kraftstoffeinspritzventile
DE102011084064A1 (de) * 2011-10-06 2013-04-11 Schaeffler Technologies AG & Co. KG Niederhalter für eine Kraftstoffeinspritzdüse
JP5929938B2 (ja) * 2014-01-30 2016-06-08 株式会社豊田自動織機 インジェクタの固定構造
GB2546500B (en) 2016-01-19 2019-07-24 Perkins Engines Co Ltd Reversible injector clamp
US11608804B1 (en) 2021-08-25 2023-03-21 Caterpillar Inc. Fuel injector having side-fitted fuel connector for tight packaging in top-feed fuel system

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0491582A1 (fr) * 1990-12-17 1992-06-24 Automobiles Peugeot Agencement pour le positionnement angulaire et le positionnement en hauteur de plusieurs injecteurs de carburant sur un moteur à combustion interne

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FR1130306A (fr) * 1955-08-23 1957-02-04 Cav Ltd Support d'ajutage d'injection de combustible liquide pour moteur à combustion interne
FR1251617A (fr) * 1960-03-17 1961-01-20 Daimler Benz Ag Fixation à isolement calorifique du gicleur pour moteur à combustion interne actionné en particulier avec un carburant léger et avec allumage extérieur
GB2074233B (en) * 1978-02-07 1983-02-02 Bendix Corp Fuel-handling arrangement in an ic engine fuel-injection system
IT1159857B (it) * 1978-06-26 1987-03-04 Fiat Spa Collettore di aspirazione provvisto di iniettori del combustibile per motori a combustione interna ad iniezione di benzina
US4966120A (en) * 1987-07-29 1990-10-30 Aisan Kogyo Kabushiki Kaisha Fuel injection system assembly

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0491582A1 (fr) * 1990-12-17 1992-06-24 Automobiles Peugeot Agencement pour le positionnement angulaire et le positionnement en hauteur de plusieurs injecteurs de carburant sur un moteur à combustion interne

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2053235A2 (de) 2007-10-23 2009-04-29 Volkswagen Aktiengesellschaft Brennkraftmaschine mit Kraftstoffinjektoren
DE102007050512A1 (de) 2007-10-23 2009-04-30 Volkswagen Ag Brennkraftmaschine mit Kraftstoffinjektoren
DE102008063645A1 (de) 2008-12-18 2010-06-24 Volkswagen Ag Brennkraftmaschine mit Spannpratze für Kraftstoffeinspritzvorrichtung
EP3945206A1 (de) 2020-07-30 2022-02-02 DEUTZ Aktiengesellschaft Injektorverpratzung
DE102020004625A1 (de) 2020-07-30 2022-02-03 Deutz Aktiengesellschaft lnjektorverpratzung
US11603816B2 (en) 2020-07-30 2023-03-14 Deutz Aktiengesellschaft Injector clamping mechanism

Also Published As

Publication number Publication date
DE69607248D1 (de) 2000-04-27
DE69607248T2 (de) 2000-09-28
JPH0914084A (ja) 1997-01-14
JP2937081B2 (ja) 1999-08-23
EP0751290A1 (en) 1997-01-02

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