EP2957760A1 - Ensemble de buses pour un injecteur de carburant et injecteur de carburant - Google Patents

Ensemble de buses pour un injecteur de carburant et injecteur de carburant Download PDF

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Publication number
EP2957760A1
EP2957760A1 EP15164374.9A EP15164374A EP2957760A1 EP 2957760 A1 EP2957760 A1 EP 2957760A1 EP 15164374 A EP15164374 A EP 15164374A EP 2957760 A1 EP2957760 A1 EP 2957760A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
spring
coupler
plate
nozzle needle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP15164374.9A
Other languages
German (de)
English (en)
Other versions
EP2957760B1 (fr
Inventor
Andreas Gruenberger
Andreas Ohm
Andreas Koeninger
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.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2957760A1 publication Critical patent/EP2957760A1/fr
Application granted granted Critical
Publication of EP2957760B1 publication Critical patent/EP2957760B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/20—Closing valves mechanically, e.g. arrangements of springs or weights or permanent magnets; Damping of valve lift
    • 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
    • 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
    • F02M61/161—Means for adjusting injection-valve lift
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/50—Arrangements of springs for valves used in fuel injectors or fuel injection pumps
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/70—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger
    • F02M2200/703—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic
    • F02M2200/704—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with actuator and actuated element moving in different directions, e.g. in opposite directions
    • 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
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8076—Fuel injection apparatus manufacture, repair or assembly involving threaded members
    • 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
    • F02M2547/00—Special features for fuel-injection valves actuated by fluid pressure
    • F02M2547/001—Control chambers formed by movable sleeves

Definitions

  • the invention relates to a nozzle assembly for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine with the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injector with such a nozzle assembly.
  • a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine which has an axially displaceably guided in a high-pressure bore of a nozzle body nozzle needle, which is directly actuated by means of an actuator, such as a piezoelectric actuator.
  • the actuator cooperates with a hydraulic coupler which comprises a coupler piston accommodated in a coupler sleeve for delimiting a coupler space.
  • the coupler chamber is connected to a control chamber, which is delimited in the axial direction by the nozzle needle. Accordingly, the pressure prevailing in the control chamber is at the nozzle needle, which pressure can be controlled via the actuator.
  • the nozzle needle is able to open or is returned to a nozzle needle seat via a hydraulic pressure force to which the spring force of a nozzle spring supported indirectly via a spring plate on the nozzle needle is reset.
  • the stroke of the nozzle needle is usually preset and is limited on the one hand by the nozzle needle seat, on the other hand by a stroke stop.
  • the default hub may be subject to change. This is especially true when connecting body parts an injector, a nozzle retaining nut is used. Because in the area of screwing the nozzle retaining nut with a body component forces are introduced into the body, which have an influence on the stroke of the nozzle needle. The influence increases with increasing distance of the stroke stop to the seat of the nozzle needle.
  • the present invention is therefore an object of the invention to provide a nozzle assembly for a fuel injector with a hubbeweglichen nozzle needle whose stroke is limited by a "seat close" stroke stop. This is intended to reduce the risk of changing a nozzle needle stroke preset in production. Furthermore, the stroke stop should be easy and inexpensive to implement.
  • the nozzle assembly proposed for a fuel injector for injecting fuel into a combustion chamber of an internal combustion engine comprises a nozzle body and a nozzle needle which is liftably received for releasing and closing at least one injection opening in a high-pressure bore of the nozzle body and acted upon in the direction of a sealing seat by the spring force of a nozzle spring.
  • the nozzle spring is supported at its end facing the nozzle seat on a spring plate coupled to the nozzle needle.
  • the nozzle spring is supported at its other end on an intermediate plate which is clamped between a nozzle part and a pipe part of the nozzle body.
  • the spring plate interacts with the intermediate plate to form a stroke stop for the nozzle needle.
  • the nozzle body of a fuel injector according to the invention is thus designed in several parts and comprises at least one nozzle part and a pipe part.
  • the multi-part design allows only the clamping of the intermediate plate, which cooperates with the spring plate hubantschnduend.
  • a multi-part nozzle body with clamped intermediate plate is simple and inexpensive to produce.
  • the clamping can be done during assembly by means of a nozzle lock nut, which is usually used in fuel injectors for axial clamping of the various body parts.
  • an axial force can be applied via the nozzle retaining nut, which causes a high-pressure-proof seal of the high-pressure bore extending over the several parts of the nozzle body.
  • the intermediate plate has a central recess for the passage of the nozzle needle, wherein the inner diameter of the recess is greater than the outer diameter of the nozzle needle in the region of the implementation.
  • the spring plate is annular and has a hollow cylindrical projection for forming a stop surface.
  • the stop surface is further preferably formed over an end face of the hollow cylindrical projection which faces the intermediate plate. Due to the coupling of the spring plate with the nozzle needle this is carried by the nozzle needle when it opens. In this case, an axial gap between the stop surface and the intermediate plate defines the maximum opening stroke of the nozzle needle.
  • the nozzle spring is disposed within the hollow cylindrical projection of the spring plate, so that this causes a guide of the nozzle spring.
  • the spring plate is supported on a collar of the nozzle needle.
  • the coupling of the spring plate with the nozzle needle is done accordingly by hanging up the annular collar, wherein the spring force of the nozzle spring holds the spring plate in contact with the annular collar.
  • To make an adjustment of the stroke of the nozzle needle can be inserted between the collar and the spring plate a shim.
  • a stroke adjustment can alternatively or additionally be made via the height of the hollow cylindrical projection of the spring plate.
  • At least one flow-through opening is formed in the spring plate and / or in the intermediate plate.
  • the flow-through opening may be formed in the intermediate plate, for example, as an eccentrically arranged axially extending channel.
  • an axially extending channel may be formed, which opens into a radially extending channel to bypass the annular collar of the nozzle needle.
  • the at least one flow-through opening can also be designed to run obliquely.
  • the at least one flow-through opening ensures that the part of the high-pressure bore enclosed by the pipe part of the nozzle body is connected to the part of the high-pressure bore enclosed by the nozzle part, so that fuel to be injected is able to flow in the direction of the at least one injection opening.
  • the nozzle needle is coupled via a coupling device with an actuator.
  • an actuator This may be a mechanical or hydraulic coupling device.
  • the actuator can be coupled to the nozzle needle in such a way that a translation of the actuator force or the Aktorhubs and / or a reversal of the effective direction of the actuator takes place.
  • the fuel injector referred to as "direct control”.
  • the coupling device comprises a liftable coupler piston and a coupler plate for guiding the coupler piston.
  • the coupler piston and the coupler plate together define a coupler volume that is ideally formed in the coupler plate.
  • the coupler plate may have a hollow cylindrical projection which surrounds the coupler piston at least partially.
  • the coupler volume is connected via a connecting channel with a control chamber.
  • the connecting channel is preferably formed in the coupler piston, which is arranged in a liftable manner between the coupler volume and the control chamber.
  • the nozzle needle for limiting the control chamber is surrounded at its end facing away from the sealing seat by a sleeve which is preferably acted upon in the direction of the coupler piston by the spring force of another spring and on the one hand supported on the sleeve, on the other hand on the intermediate plate is.
  • the spring force of the other spring holds the sleeve in abutment with the coupler piston, so that the control chamber is separated from the high pressure bore.
  • a pressure pin is preferably guided by the coupler plate.
  • a guide bore is formed in the coupler plate whose guide clearance is chosen to be as small as possible in order to separate the coupler volume from a low-pressure region beyond the coupler plate.
  • the actuator is preferably arranged. The pressure pin transmits the force or the stroke of the actuator to the coupler body.
  • a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine having a nozzle assembly according to the invention and an actuator which is hydraulically and / or mechanically coupled or coupled to the nozzle needle for actuating the nozzle needle.
  • the actuator is a piezoelectric actuator or a magnetic actuator, which further preferably in a low pressure region the fuel injector is arranged.
  • the use of a piezoelectric actuator or a magnetic actuator allows direct actuation of the nozzle needle.
  • the actuator is preferably accommodated in a body component of the injector, which is clamped axially via the already mentioned nozzle retaining nut with the parts of the nozzle body, the intermediate plate and the coupler plate.
  • the Indian Fig. 1 in longitudinal section shown fuel injector comprises a two-part nozzle body 1 with a nozzle part 1.1 as a first part and a pipe part 1.2 as a second part. Between the two parts 1.1 and 1.2 of the nozzle body 1, an intermediate plate 8 is arranged and clamped together with the two parts 1.1 and 1.2 of the nozzle body 1, a coupler plate 18 and a further body member 26 via a nozzle nut 27 axially. About the screwing of the nozzle retaining nut 27 forces are introduced into the injector, which may be relevant to function.
  • the stop surface A is presently formed on a hollow cylindrical projection 11 of a spring plate 7, which rests on a collar 12 of the nozzle needle 2 and is held by the spring force of a nozzle spring 6 in contact with the annular collar 12.
  • the spring force of the directly adjacent to the spring plate 7 nozzle spring 6 presses the nozzle needle 2 in the sealing seat 5.
  • the nozzle spring 6 is supported by a control pressure in a control chamber 21 which causes a force acting on the nozzle needle 2 hydraulic closing force.
  • the spring plate 7 is arranged at an axial distance to the aforementioned intermediate plate 8 and cooperates with this a stroke stop 9 training together.
  • the axial distance defines the maximum opening stroke h of the nozzle needle 2.
  • the supported on the spring plate 7 nozzle spring 6 on the other hand supported on the intermediate plate 8, wherein the clamping of the intermediate plate 8 between the nozzle part 1.1 and the tube part 1.2 of the nozzle body 1 a change in position of the intermediate plate 8 prevented.
  • the stroke stop 9 is set.
  • the default setting of the stroke h via the height of the hollow cylindrical projection 11 of the spring plate. 7
  • the spring plate 7 and the intermediate plate 8 Due to the arrangement of the spring plate 7 and the intermediate plate 8 in the high pressure bore 4, d. H. in a region close to the seat, the axial distance between the stop surface A and the sealing seat 5 is minimized compared to the prior art. This ensures that the influence of the screwing of the nozzle retaining nut 27 on the preset stroke h of the nozzle needle 2 and thus on the function of the injector is minimal. Furthermore, the spring plate 7 and the intermediate plate 8 simple geometries, so that they are inexpensive to produce.
  • the intermediate plate 8 has a central recess 10 through which the nozzle needle 2 is guided.
  • the inner diameter of the recess 10 is larger than the outer diameter of the nozzle needle 2 selected in this area, so that an annular gap remains as a flow opening for the fuel to be injected.
  • at least one flow opening 13 may be provided in the form of an axial bore in the intermediate plate 8.
  • an actuator 16 is accommodated in the further body component 26, which is embodied in the present case as a piezoactuator and can be coupled to the nozzle needle 2 via a hydraulic coupling device 15.
  • the hydraulic coupling device 15 comprises a liftable coupler piston 17, which is guided in the coupler plate 18 and defines a coupler volume 19 formed in the coupler plate 18.
  • the coupler plate 18 has a hollow cylindrical projection which surrounds the coupler piston 17 at least in regions.
  • the coupler plate 18 is penetrated by a pressure pin 24, which transmits the stroke of the actuator 16 to the coupler piston 17.
  • the coupler volume 19 formed in the coupler plate 18 is connected to the already mentioned control space 21 via a connection channel 20, which in the present case is formed in the coupler piston 17.
  • the limitation is effected by a sleeve 22 which surrounds the control-chamber-side end of the nozzle needle 2 and is held in contact with the coupler piston 17 via the spring force of a spring 23.
  • the spring 23 is for this purpose supported on the one hand on the coupler piston 17, on the other hand on the intermediate plate 8.
  • the actuator 16 is activated.
  • the trained as a piezoelectric actuator 16 then elongates and pushes - against the spring force of a spring 29 - a piston 28 down.
  • the piston 28 in turn takes the pressure pin 24, which transmits the Aktorhub on the coupler piston 17. This has the consequence that also the coupler piston 17 is moved downward.
  • the movement of the coupler piston 17 leads to an increase in the Kopplervolumens 19 and thus to a pressure drop in the coupler volume 19.
  • Due to the hydraulic connection of the coupler volume 19 with the control chamber 21 also drops the pressure there.
  • the pressure drop in the control chamber 21 relieves the nozzle needle 2, so that it lifts off from the sealing seat 5 and the injection port 3 releases.
  • the piezoelectric actuator is deactivated. This has the consequence that the piezoelectric actuator contracts again.
  • the spring force of the spring 29 presses the piston 28 upwards.
  • the provision of the coupler piston 17 is effected by the spring force of the spring 23. With the provision of the coupler piston 17, the coupler volume 19 decreases, whereby the pressure in the coupler volume 19 and in the control chamber 21 increases again.
  • On the nozzle needle 2 now acts - in addition to the spring force of the nozzle spring 6 - a hydraulic closing force, which presses the nozzle needle 2 in the sealing seat 5, so that the injection is terminated.
  • the Indian Fig. 2 illustrated fuel injector differs from that of Fig. 1 only slightly. It has flow-through openings 13, 14 in the spring plate 7, which replace a flow-through opening 13 in the intermediate plate 8.
  • the through-flow opening 13 in the present case is designed as a longitudinal groove in an inner circumferential region of the spring plate 7, into which a radially extending channel serving as a flow-through opening 14 opens.
  • the flow-through opening 14 ensures that the fuel to be injected reaches the annular collar 12 of the nozzle needle 2 in the lower part of the high-pressure bore 4.
  • the functioning of the injector of Fig. 2 the same applies to the Fig. 1 ,
  • the figures represent only preferred embodiments of the invention. Modifications are possible. In particular, may be provided instead of a piezoelectric actuator, a magnetic actuator for controlling the lifting movement of the nozzle needle.
  • the coupler can be designed as a mechanical coupler. In addition, the arrangement of a coupler can also be dispensed with altogether.

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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)
EP15164374.9A 2014-06-16 2015-04-21 Ensemble de buses pour un injecteur de carburant et injecteur de carburant Not-in-force EP2957760B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014211469.1A DE102014211469A1 (de) 2014-06-16 2014-06-16 Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2957760A1 true EP2957760A1 (fr) 2015-12-23
EP2957760B1 EP2957760B1 (fr) 2017-06-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP15164374.9A Not-in-force EP2957760B1 (fr) 2014-06-16 2015-04-21 Ensemble de buses pour un injecteur de carburant et injecteur de carburant

Country Status (2)

Country Link
EP (1) EP2957760B1 (fr)
DE (1) DE102014211469A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018153596A1 (fr) * 2017-02-21 2018-08-30 Robert Bosch Gmbh Injecteur de carburant destiné à injecter un carburant gazeux et/ou liquide

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472142A (en) * 1992-08-11 1995-12-05 Nippondenso Co., Ltd. Accumulator fuel injection apparatus
WO2001023755A1 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
EP1304475A1 (fr) * 2001-10-20 2003-04-23 Robert Bosch Gmbh Injecteur de carburant
WO2006003041A1 (fr) * 2004-06-30 2006-01-12 Robert Bosch Gmbh Dispositif d'injection de carburant
DE102006021491A1 (de) 2006-05-09 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit direkt betätigbarer Düsennadel
EP1865192A2 (fr) * 2006-06-07 2007-12-12 Robert Bosch Gmbh Injecteur de carburant doté d'une assistance adaptative à la direction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5472142A (en) * 1992-08-11 1995-12-05 Nippondenso Co., Ltd. Accumulator fuel injection apparatus
WO2001023755A1 (fr) * 1999-09-30 2001-04-05 Robert Bosch Gmbh Soupape d'injection de carburant pour moteurs a combustion interne
EP1304475A1 (fr) * 2001-10-20 2003-04-23 Robert Bosch Gmbh Injecteur de carburant
WO2006003041A1 (fr) * 2004-06-30 2006-01-12 Robert Bosch Gmbh Dispositif d'injection de carburant
DE102006021491A1 (de) 2006-05-09 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit direkt betätigbarer Düsennadel
EP1865192A2 (fr) * 2006-06-07 2007-12-12 Robert Bosch Gmbh Injecteur de carburant doté d'une assistance adaptative à la direction

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018153596A1 (fr) * 2017-02-21 2018-08-30 Robert Bosch Gmbh Injecteur de carburant destiné à injecter un carburant gazeux et/ou liquide

Also Published As

Publication number Publication date
EP2957760B1 (fr) 2017-06-28
DE102014211469A1 (de) 2015-12-17

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