EP2080892A1 - Injecteur de carburant - Google Patents

Injecteur de carburant Download PDF

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Publication number
EP2080892A1
EP2080892A1 EP08000743A EP08000743A EP2080892A1 EP 2080892 A1 EP2080892 A1 EP 2080892A1 EP 08000743 A EP08000743 A EP 08000743A EP 08000743 A EP08000743 A EP 08000743A EP 2080892 A1 EP2080892 A1 EP 2080892A1
Authority
EP
European Patent Office
Prior art keywords
rod
shaped body
fuel injector
sleeve
injector according
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Withdrawn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
EP08000743A
Other languages
German (de)
English (en)
Inventor
Carsten Kortwig
Christian Schwarz
Michael Zakrzewski
Tarik Günay
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 Inc
Original Assignee
Delphi Technologies Inc
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 Inc filed Critical Delphi Technologies Inc
Priority to EP08000743A priority Critical patent/EP2080892A1/fr
Publication of EP2080892A1 publication Critical patent/EP2080892A1/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Withdrawn legal-status Critical Current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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/005—Arrangement of electrical wires and connections, e.g. wire harness, sockets, plugs; Arrangement of electronic control circuits in or on fuel injection apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • 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
    • F02M51/00—Fuel-injection apparatus characterised by being operated electrically
    • F02M51/06—Injectors peculiar thereto with means directly operating the valve needle
    • F02M51/0603—Injectors peculiar thereto with means directly operating the valve needle using piezoelectric or magnetostrictive operating means

Definitions

  • the present invention relates to a fuel injector for fuel injection of fuel into an internal combustion engine, wherein the fuel injector comprises a substantially rod-shaped body with two connection contacts for energizing an actuator received by the rod-shaped body for actuating the fuel injector.
  • the actuator in the form of an electromagnet or a piezoelectric element serves for purposes of fuel injection of the actuation of the nozzle needle of the fuel injector. Since such fuel injectors integrate directly into the engine block, it is necessary to isolate the electrical leads for powering the actuator both to the engine block and to the injector itself. Such insulation can be achieved, for example, by embedding the rod-shaped body of the fuel injector, including the electrical lines for the actuation of the actuator, by injection or melt casting into an insulating plastic jacket. However, this approach proves to be unfavorable in that different molds are required for different fuel injectors, even if they have only different lengths.
  • the invention is therefore an object of the invention to provide a fuel injector, which can be produced with less economic and technical effort.
  • the object is achieved with a fuel injector having the features of claim 1.
  • the object is achieved in that the fuel injector a surrounding a peripheral portion of the rod-shaped body and releasably attached thereto rohförmige cuff made of an insulating material in which two extending in the longitudinal direction of the rod-shaped body conductor sections are embedded, and two insulated extension conductors which both with the conductor portions of the sleeve as well as with the terminal contacts of the rod-shaped body can be coupled.
  • the sleeve tube is not sprayed directly onto the rod-shaped body, but releasably secured to the peripheral portion, for example by a latching mechanism
  • the sleeve can be prefabricated as a separate member of the rod-shaped body and, for example, by sliding onto the peripheral portion of the rod-shaped body and latching be connected with this.
  • the collar can be made of an insulating material as an injection molded part separate from the rod-shaped body, so that it is not necessary to provide the rod-shaped body itself with a jacket by means of a casting method.
  • a further advantage of the inventive design of the fuel injector further consists in the fact that, due to the presence of the extension ladder for fuel injectors of different lengths, only a single type of cuff must be manufactured and stored, since the different distances between the connecting contacts of the rod-shaped body and extending in the cuff Conductor sections can be bridged by differently long insulated extension ladder. Although then for different lengths fuel injectors have different lengths insulated extension ladder be produced and kept. In the insulation for the extension ladder, however, it may be extruded or extruded plastic parts, which can be produced by the meter, for example, by extruding with less technical and economic effort, which will be discussed in more detail later.
  • the fuel injector according to the invention can thus be modularly assembled according to a modular principle, whereby a certain standardization in the production of the fuel injector can be achieved.
  • the peripheral portion of the rod-shaped body which is surrounded by the sleeve, according to an embodiment in the longitudinal direction of the rod-shaped body of the fuel injector spaced from the existing on the rod-shaped body terminal contacts for energizing the actuator can be located.
  • the said peripheral portion is located in a rear region of the rod-shaped body, whereas the connection contacts are located in a front region of the rod-shaped body.
  • the peripheral section in question and the terminal contacts are arranged spaced apart from each other in the longitudinal direction of the rod-shaped body, the peripheral section may have a reduced circumference relative to an adjoining section of the rod-shaped body on which, for example, said terminal contacts may be located , so that the fuel injector this point has no diameter jump due to the pushed onto the rod-shaped body cuff.
  • the conductor sections injected into the same during injection molding of the sleeve can be rigid busbars which are obtained from a metal sheet by stamping and subsequent folding. Unlike easily deformable and sagging conductor wires, the conductor sections thus have a significantly higher rigidity, so that when injecting the conductor sections in the sleeve there is no danger that due to any deformation of the conductor sections, the required coverage of insulating material is not met.
  • the formation of the conductor sections as stamped sheet-metal shaped parts allows the conductor sections to be shaped or edged so that they each have a rear terminal tongue which emerges radially from the sleeve and onto which a plug for power supply can be plugged directly.
  • the connection tongues of the conductor sections can preferably be surrounded by a connection bush formed integrally with the sleeve, so that the plug is plugged onto the connection tongues through the connection socket which further reduces the risk of damage to the terminal tabs.
  • each of the conductor sections of the cuff can furthermore have a connection contact exposed in the direction of the associated extension conductor and pointing in the direction of the injection nozzle of the injector, which can mean, for example, that the conductor sections project forward with their front end over the front end side of the connector Protrude cuff.
  • a connection contact exposed in the direction of the associated extension conductor and pointing in the direction of the injection nozzle of the injector, which can mean, for example, that the conductor sections project forward with their front end over the front end side of the connector Protrude cuff.
  • small recesses are formed in the end face of the sleeve, protrude into the front ends of the conductor sections of the sleeve and thus are accessible for contacting with the extension conductors.
  • the extension conductors may be busbars punched out of a metal sheet and possibly bevelled, in the same way as in the conductor sections of the sleeve.
  • the extension conductors thus also have, in contrast to simple conductor wires, a significantly higher rigidity and can thus be pushed into or pushed through the insulation from which they are received.
  • the insulation for example, have a through opening which extends completely through the insulation and thus can be produced simultaneously with the production of the insulation itself by extruding or extrusion.
  • each extension ladder is the insulation of the extension ladder to extruded or extruded strip-like plastic parts with the just-mentioned through holes, so that each extension ladder a own plastic strip is assigned.
  • it is sufficient to form on the rod-shaped body of the fuel injector only relatively small recesses for receiving the plastic strips, whereby the interior of the rod-shaped body is not or only slightly affected.
  • the insulation not as a single plastic strips but for example as an extruded plastic tube in which two through openings are provided for receiving the extension ladder, so that the insulation as a whole, similar to the cuff pushed onto the rod-shaped body could be.
  • the portion of the rod-shaped body accommodating the tubular insulation would have a reduced circumference with respect to an adjoining portion of the rod-shaped body, similar to the peripheral portion which serves to receive the sleeve, so that no diameter discontinuities occur along the fuel injector.
  • the rod-shaped body has flattened receiving areas for the insulated extension conductors, wherein the shape of the insulation of the extension conductors and the shape of the rod-shaped Body or the shape of the receiving areas formed therein are matched to one another such that the isolated extension conductor received by the receiving areas form a circular cross section in connection with the rod-shaped body.
  • the extension ladder may have a slightly greater length than the surrounding insulation, to be accessible for purposes of contacting.
  • the insulating tube or the insulating strips both at their front end and at its rear end have recesses into which protrude the extension ladder.
  • any fastening means are suitable for this purpose, but it is preferred to fasten the extension conductors releasably, for example by latching mechanisms, or inextricably, for example by gluing, to the rod-shaped body.
  • Fig. 1 can be taken, showing the fuel injector according to the invention in a perspective exploded view before attaching the sleeve 14 on the rod-shaped body 12 of the fuel injector 10, the rod-shaped body 12 has a substantially rod-shaped, cylindrical shape with several adjacent, substantially cylindrical sections differing diameters. At its front end, the rod-shaped body 12 is closed by a fuel injection nozzle 16, which can be opened by actuation of a recorded in the rod-shaped body 12 Aktautors (not shown) for fuel injection.
  • the section of the rod-shaped body 12 with the largest diameter or circumference 22 is referred to below as shaft section 22, whereas the two sections 18 adjoining it on the side of the shaft section 22 opposite the fuel injection nozzle 16 are referred to below as peripheral section 18.
  • the sections forming the peripheral portion 18 each have a reduced circumference or diameter relative to the shaft portion 22.
  • the Peripheral portion 18 serves to receive the substantially tubular sleeve 14, which was prefabricated as an injection molded part.
  • the inner contour of the tubular sleeve 14 is matched to the outer contour of the peripheral portion 18 such that the sleeve 14 can be plugged in the longitudinal direction of the rod-shaped body 12 on the peripheral portion 18, as shown in the Fig. 1 indicated by the arrows A.
  • connection contacts 36 At the front end of each of the flattened receiving areas 40 there are connection contacts 36, via which the energization of an actuator received by the rod-shaped body 12 for actuation of the fuel injection nozzle 16 can take place.
  • connection contacts 36 In order to be able to apply the required voltage signals for activating the actuator to these connection contacts 36, electrical conductors 28, 34 are guided in the sleeve 14 as well as in the insulating strips 20, so that over substantially the entire length of the rod-shaped body 12 the voltage signals are opposite the one rod-shaped body 12 isolated to the connection contacts 36 can be transmitted.
  • conductor portions 28 are embedded in the form of busbars (see Fig. 3a ), which were obtained from a metal sheet by punching and final folding.
  • the conductor sections 28 are thereby in the insulating material of the sleeve 14 during the manufacturing process of the sleeve 14, for example by injection molding in the Indian Fig. 3a embedded mutual orientation embedded.
  • Fig. 1 can be removed, the conductor sections 28 protrude at the end face or the front end of the sleeve 14 with their connection contacts 32, so that they are freely accessible for purposes of contacting.
  • each conductor section 28 at its rear end to a radially emerging from the sleeve 14 terminal tongue 30 (see Fig. 3a ), which, however, in the Fig. 1 are not recognizable, since they are surrounded by a one-piece with the collar 14 formed socket 26.
  • electrical conductors 34 are also routed in the insulating strips 20, via which the voltage signals from the terminal contacts 32 of the conductor sections 28 can be transmitted to the terminal contacts 36 in the region of the flattened areas of the rod-shaped body 12.
  • the insulating strips 20 are not injection-molded components; Rather, the insulating strips 20 are obtained by extrusion or extrusion, whereby at the same time the insulating strips 20 in the longitudinal direction passing through openings 38 are generated (see Fig. 3d ), which serve to receive the extension conductors 34 (see Fig. 3b ).
  • the extension conductors 34 are similar to the conductor sections 28 punched out of a metal sheet and then bent busbars, so that they have a certain rigidity to be inserted into the through holes 38 of the insulating strips 20, as best of Fig. 3c can be removed. In this case, the extension conductors 34 protrude into recesses 24 formed at the ends of the insulating strips 20 and are therefore for contacting with the connecting contacts 36 of the rod-shaped body 12 or freely accessible with the connection contacts 32 of the conductor sections 28.
  • Fig. 3d can be removed, the insulating strips 20 seen in cross-section substantially the shape of a circular section, wherein the flats or receiving areas 40 along the shaft portion 22 and the cross-sectional shape of the insulating strips 20 are matched to one another, that of the receiving areas 40 received by the insulating strips 20 insulated extension conductors 34 in conjunction with the rod-shaped body 12 form a circular cross section, as shown in the Fig. 1 is shown.
  • no special fastening means of the insulating strips 20 are provided on the rod-shaped body 12; Rather, the insulating strips 20 are glued to the flattened receiving areas 40.
  • connection contacts 36 are in the region of the front end of the receiving areas 40 in contact with the projecting into the recesses 24 of the insulating strips 20 extension conductors 34.
  • connection contacts 32 are also the connection contacts 32, which protrude beyond the front end face of the sleeve 14, in contact with the rear ends of the extension conductors 34, which protrude into the rear recesses 24 of the insulating strips 20 (see Fig. 3c ).
  • connection tongues 30 of the conductor sections 28 there are therefore continuous signal paths to the connection contacts 36, so that via the connection tongues 30 corresponding voltage signals can be transmitted to the connection contacts 36 for actuating the actuator of the fuel injector 10.
  • the recorded by the sleeve 14 and the insulating strips 20 conductors 28, 34 are not only relative to the rod-shaped body 12th the injector 10 but also to the environment such as an engine block isolated.
  • the rear recesses 24 of the insulating 20 are shed with a suitable insulating material.
  • the insulating material can not flow away, as this is prevented by the inner boundary of the recesses 24 and the directly adjacent to the rear ends of the insulating strips 20 end face of the sleeve 14.
  • the front recesses 24 can be cast with a suitable potting material, after the front ends of the extension conductors 34 have been connected to the terminal contacts 36, for example by laser welding.
  • the present invention now proves to be advantageous in that fuel injectors 10 of different lengths can be equipped with one and the same type of sleeve 14, as shown in FIGS Fig. 2a and 2b is shown.
  • FIGS Fig. 2a and 2b the differences in the Fig. 2a and 2b shown fuel injectors 10 only in that they have different lengths shaft portions 22.
  • the shaft portions 22 have different lengths
  • the two fuel injectors 10 are equipped with one and the same type of sleeve 14, so that despite the different lengths of the injectors 10 some standardization and modularization in the manufacture of the injectors 10 can be achieved.
  • connection contacts 32 which project beyond the front end of the sleeve 14, and the connection contacts 36 in the region of the receiving regions 40 of the rod-shaped Body 12 is balanced by means of the insulated extension conductor 34.
  • the insulating strips 20 are kept as a result of their production by extrusion or extrusion as yard goods and then can be cut to the required length if necessary.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)
EP08000743A 2008-01-16 2008-01-16 Injecteur de carburant Withdrawn EP2080892A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08000743A EP2080892A1 (fr) 2008-01-16 2008-01-16 Injecteur de carburant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08000743A EP2080892A1 (fr) 2008-01-16 2008-01-16 Injecteur de carburant

Publications (1)

Publication Number Publication Date
EP2080892A1 true EP2080892A1 (fr) 2009-07-22

Family

ID=39473576

Family Applications (1)

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EP08000743A Withdrawn EP2080892A1 (fr) 2008-01-16 2008-01-16 Injecteur de carburant

Country Status (1)

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EP (1) EP2080892A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103306876A (zh) * 2012-03-07 2013-09-18 曼柴油机和涡轮机欧洲股份公司 燃料喷射器
WO2014000969A1 (fr) * 2012-06-29 2014-01-03 Robert Bosch Gmbh Soupape d'injection de carburant
EP2713040A1 (fr) * 2012-09-26 2014-04-02 Delphi International Operations Luxembourg S.a.r.l. Connecteur électrique
WO2014072099A1 (fr) * 2012-11-09 2014-05-15 Robert Bosch Gmbh Soupape pour le dosage de fluide

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5934253A (en) * 1996-12-24 1999-08-10 Toyota Jidosha Kabushiki Kaisha Fuel injection apparatus
DE19853102A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102004056667A1 (de) * 2004-11-24 2006-06-01 Robert Bosch Gmbh Elektrische Überbrückung in Kraftstoffinjektoren

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5934253A (en) * 1996-12-24 1999-08-10 Toyota Jidosha Kabushiki Kaisha Fuel injection apparatus
DE19853102A1 (de) * 1998-06-18 1999-12-23 Bosch Gmbh Robert Brennstoffeinspritzventil
DE102004056667A1 (de) * 2004-11-24 2006-06-01 Robert Bosch Gmbh Elektrische Überbrückung in Kraftstoffinjektoren

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103306876A (zh) * 2012-03-07 2013-09-18 曼柴油机和涡轮机欧洲股份公司 燃料喷射器
JP2015509568A (ja) * 2012-03-07 2015-03-30 マン・ディーゼル・アンド・ターボ・エスイー 燃料噴射装置
CN103306876B (zh) * 2012-03-07 2016-03-30 曼柴油机和涡轮机欧洲股份公司 燃料喷射器
WO2014000969A1 (fr) * 2012-06-29 2014-01-03 Robert Bosch Gmbh Soupape d'injection de carburant
EP2713040A1 (fr) * 2012-09-26 2014-04-02 Delphi International Operations Luxembourg S.a.r.l. Connecteur électrique
WO2014048690A1 (fr) * 2012-09-26 2014-04-03 Delphi International Operations Luxembourg S.À.R.L. Connecteur électrique
WO2014072099A1 (fr) * 2012-11-09 2014-05-15 Robert Bosch Gmbh Soupape pour le dosage de fluide
CN104781542A (zh) * 2012-11-09 2015-07-15 罗伯特·博世有限公司 用于计量分配流体的阀

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