EP2905458A1 - Ensemble de buse pour un injecteur de carburant et injecteur de carburant - Google Patents

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

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Publication number
EP2905458A1
EP2905458A1 EP14199945.8A EP14199945A EP2905458A1 EP 2905458 A1 EP2905458 A1 EP 2905458A1 EP 14199945 A EP14199945 A EP 14199945A EP 2905458 A1 EP2905458 A1 EP 2905458A1
Authority
EP
European Patent Office
Prior art keywords
nozzle
spring
sleeve
nozzle needle
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
EP14199945.8A
Other languages
German (de)
English (en)
Other versions
EP2905458B1 (fr
Inventor
Andreas Gruenberger
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
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 Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP2905458A1 publication Critical patent/EP2905458A1/fr
Application granted granted Critical
Publication of EP2905458B1 publication Critical patent/EP2905458B1/fr
Active 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
    • 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
    • F02M61/167—Means for compensating clearance or thermal expansion
    • 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
    • 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
    • F02M2200/70—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
    • F02M2200/708—Linkage between actuator and actuated element, e.g. between piezoelectric actuator and needle valve or pump plunger hydraulic with hydraulic chambers formed by a movable sleeve

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 can open or is returned to a nozzle needle seat via a hydraulic pressure force, to which the spring force of a nozzle spring supported on the nozzle needle is added.
  • 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 applies in particular if a nozzle retaining nut is used to connect the body components of an injector. 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.
  • 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 in a high-pressure bore of the nozzle body for releasing and closing at least one injection opening and acted upon in the direction of a sealing seat by the spring force of a nozzle spring, which is supported on the one hand directly or indirectly on the nozzle needle and on the other hand on a sleeve surrounding the nozzle needle.
  • the sleeve forms a stop surface for limiting the stroke of the nozzle needle.
  • a further spring is supported on the sleeve whose spring force is greater than that of the nozzle spring, so that the sleeve is axially biased by the spring force of the other spring in the direction of a shoulder of the nozzle body.
  • the nozzle assembly according to the invention therefore has at least two springs. This allows a function separation of the functions of a conventional nozzle spring, which consist in a) to put the nozzle needle in their seat and b) to prevent lifting of the sleeve.
  • a conventional nozzle spring which consist in a) to put the nozzle needle in their seat and b) to prevent lifting of the sleeve.
  • the sleeve is usually arranged on the seat facing away from the end of the nozzle needle and supported on the housing side. In this arrangement, the sleeve can also take over the function of a sealing sleeve for the radial limitation of a control chamber.
  • the sleeve - against the spring force of the nozzle spring - axially biased in the direction of a shoulder of the nozzle body.
  • the biasing force is effected by the spring force of the other spring.
  • the arrangement of the other spring in the nozzle body shifts the position of the sleeve in the direction of the sealing seat. Since the sleeve also forms the stroke stop, this also moves in the direction of the sealing seat. In this way, a nozzle assembly is provided with a seat-mounted stroke stop, so that the screwing of a clamping nut with a body component of the injector has a much smaller influence on the preset stroke of the nozzle needle.
  • the shoulder of the nozzle body in the direction of which the sleeve is prestressed axially via the further spring, is formed in the region of the high-pressure bore.
  • the high-pressure bore of the nozzle body to form the shoulder is formed as a stepped bore.
  • the shoulder preferably has a radially extending surface on which the sleeve is directly supported. The axial position of the shoulder in this case determines the axial position of the sleeve or the axial position of the stop surface formed on the sleeve for limiting the nozzle needle stroke.
  • the stop surface and / or at least one shoulder, on which the nozzle spring and / or the other spring is supported the sleeve designed stepped.
  • the sleeve has both a stepped outer contour, as well as a stepped inner contour, so that circumferential paragraphs are formed for supporting both springs.
  • the stop surface for limiting the stroke of the nozzle needle is preferably formed on a shoulder of a stepped inner contour. This is further preferably designed such that decreases with increasing distance to the sealing seat of the inner diameter of the sleeve.
  • the nozzle spring is arranged coaxially with respect to the further spring.
  • the nozzle spring is arranged radially inward with respect to the further spring.
  • the nozzle spring has a smaller diameter than the other spring, so that it can be arranged at least in sections within the other spring. This allows a compact arrangement of the two springs.
  • the nozzle spring is also preferably supported on a shoulder of a stepped inner contour of the sleeve and the further spring is supported on a shoulder of a stepped outer contour of the sleeve.
  • the nozzle spring is preferably supported on an annular collar or on a spring plate connected to the nozzle needle.
  • the annular collar or the spring plate can have a larger outer diameter than the nozzle spring, so that it cooperates with the stop surface of the sleeve forming a stroke stop.
  • a stroke adjustment disk be arranged between the nozzle spring and the annular collar or the spring plate.
  • the further spring is preferably supported at its end facing away from the sleeve on a sealing sleeve, in which a seat distal end of the nozzle needle is guided in a liftable manner.
  • the leadership of the nozzle needle on the sealing sleeve has the advantage that any axial offset is compensated for sealing seat.
  • the spring force of the other spring axially biases the sealing sleeve in the direction of a plate-shaped body component, preferably a throttle plate.
  • a sealing force is effected, which ensures the sealing function of the sealing sleeve.
  • 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 assembly for direct or indirect actuation of the nozzle needle is proposed, wherein the actuator assembly comprises a piezoelectric actuator or a magnetic actuator.
  • the actuator assembly is preferably received in a body member of the injector, which is axially clamped by a clamping nut with the nozzle body.
  • further body components in particular plate-shaped body components, such as a throttle plate, may be arranged.
  • the Aktorbaueria is coupled via a hydraulic or mechanical coupler with the nozzle needle or coupled.
  • the hydraulic or mechanical coupler can be used for force and / or stroke amplification, so that a smaller actuator can be used.
  • the fuel injector shown in longitudinal section comprises a plurality of body components, namely a nozzle body 1, a throttle plate 15, a coupler plate 22 and a holding body 23.
  • a clamping nut 28 which is supported on the nozzle body 1 and screwed to the holding body 23, all body components are axially braced.
  • all body components are axially braced.
  • the screw of the clamping nut 28 forces are introduced into the injector, which may be relevant to function. For such forces can lead to a change in a preset stroke h of a nozzle needle 2, which is received in a liftable manner in a high-pressure bore 4 of the nozzle body 1 for releasing and closing at least one injection opening 3.
  • the magnitude of the influence of the forces depends in particular on the distance of a stop surface A for limiting the nozzle needle stroke from a sealing seat 5 of the nozzle needle 2. To reduce the influence, the distance should be as small as possible.
  • the high-pressure bore 4 of the nozzle body 1 receives two springs, which are each designed as helical compression springs.
  • the first spring is a nozzle spring 6, which is indirectly supported on the one hand via a Hubeinstellhunt 13 on an annular collar 12 of the nozzle needle 2 and on the other hand on a shoulder 10 of a sleeve 7.
  • the nozzle spring 6 supports the nozzle needle 2 in the sealing seat 5.
  • the nozzle spring 6 is thereby supported by a control pressure in a control chamber 16, which is delimited by the nozzle needle 2, a seat distal end of the nozzle needle 2 receiving sealing sleeve 14 and the throttle plate 15, at which the sealing sleeve is supported.
  • the further spring 8 serves for the axial prestress of the sealing sleeve 14 with respect to the throttle plate 15 in order to prevent the sealing sleeve 14 from lifting off the throttle plate 15.
  • the further spring 8 is supported on a shoulder 11 of the sleeve 7. Characterized in that the spring force of the spring 8 is selected to be greater than that of the nozzle spring 6, a lifting of the sleeve 7 is prevented by a shoulder 9 of the nozzle body 1, which is formed within the high-pressure bore 4.
  • the sleeve 7 is executed stepped.
  • the stepped design is also present in the formation of the stop surface A, which cooperates with the Hubeinstellfactor 13 forms a stroke stop.
  • the axial distance between the abutment surface A and the Hubeinstellfactor 13 thus determines the stroke h of the nozzle needle 2.
  • the arrangement of the sleeve 7 in a seat-near area has the consequence that the axial distance between the stop surface A and the sealing seat 5 - in comparison to the state the technology - is low. This ensures that the influence of the screwing of the clamping nut on the preset stroke of the nozzle needle 2 and thus on the function of the injector is minimal.
  • a piezoelectric actuator of an actuator assembly 17 is activated, which is received in the holding body 23.
  • the piezoelectric actuator expands and presses a first coupler piston 18.1 of a hydraulic coupler 18 against the spring force of a coupler spring 21 down.
  • the first coupler piston 18.1 is operatively connected to a second coupler piston 18.3, so that this is moved downward.
  • the result of the movement of the second coupler piston 18.3 is that the volume of a coupler space 19 which is formed in the coupler plate 22 increases, so that a pressure drop in the coupler space 19 is effected. Since the coupler space 19 via a connecting channel 20th is connected to the control chamber 16, and the pressure in the control chamber 16 drops.
  • the pressure drop in the control chamber 16 relieves the nozzle needle 2, so that it lifts off from the sealing seat 5 and the injection port 3 releases.
  • connecting channels 25 are formed in the sleeve.
  • the piezoelectric actuator of the actuator assembly 17 is deactivated. This has the consequence that the piezoelectric actuator contracts again.
  • the coupler spring 21 then pushes the coupler piston 18.1 upwards.
  • the movement of the coupler piston 18.1 follow the pressure pin 18.2 and the coupler piston 18.3, possibly supported by the spring force of another spring (not shown).
  • This is accompanied by an increase in pressure in the coupling chamber 19 and in the control chamber 16, so that a hydraulic closing force acts on the nozzle needle 2 - in addition to the spring force of the nozzle spring 6.
  • the nozzle needle 2 is returned to the sealing seat 5 and the injection ended.
  • the Aktorbauffle is presently surrounded by low pressure. This can lead to a leakage in the region of the guidance of the pressure pin 18.2 via the coupler plate 22, which separates the high-pressure region of the injector from the low-pressure region. For discharging a leakage amount, a return 27 is provided.
  • the sole figure represents only a preferred embodiment 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 may be a mechanical coupler.
  • the arrangement of a coupler can be dispensed with in its entirety. The presently selected embodiment is merely illustrative of a fuel injector having a nozzle assembly according to the present invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)
EP14199945.8A 2014-02-03 2014-12-23 Ensemble de buse pour un injecteur de carburant et injecteur de carburant Active EP2905458B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014201850.1A DE102014201850A1 (de) 2014-02-03 2014-02-03 Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor

Publications (2)

Publication Number Publication Date
EP2905458A1 true EP2905458A1 (fr) 2015-08-12
EP2905458B1 EP2905458B1 (fr) 2016-09-07

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EP14199945.8A Active EP2905458B1 (fr) 2014-02-03 2014-12-23 Ensemble de buse pour un injecteur de carburant et injecteur de carburant

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EP (1) EP2905458B1 (fr)
DE (1) DE102014201850A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2955366A1 (fr) * 2014-06-13 2015-12-16 Robert Bosch Gmbh Ensemble de buses pour un injecteur de carburant et injecteur de carburant

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH342792A (de) * 1956-07-19 1959-11-30 Saurer Ag Adolph Einspritzdüse mit in Strömungsrichtung des Brennstoffes öffnender Düsennadel
WO2002090756A1 (fr) * 2001-05-08 2002-11-14 Robert Bosch Gmbh Appareil d'injection de carburant pour moteurs a combustion, en particulier injecteur de type common rail, systeme d'alimentation en carburant et moteur a combustion
DE10254734A1 (de) * 2002-11-23 2004-06-03 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung
DE102006009659A1 (de) * 2005-07-25 2007-02-01 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine mit Kraftstoff-Direkteinspritzung
DE102006021491A1 (de) 2006-05-09 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit direkt betätigbarer Düsennadel

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH342792A (de) * 1956-07-19 1959-11-30 Saurer Ag Adolph Einspritzdüse mit in Strömungsrichtung des Brennstoffes öffnender Düsennadel
WO2002090756A1 (fr) * 2001-05-08 2002-11-14 Robert Bosch Gmbh Appareil d'injection de carburant pour moteurs a combustion, en particulier injecteur de type common rail, systeme d'alimentation en carburant et moteur a combustion
DE10254734A1 (de) * 2002-11-23 2004-06-03 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung
DE102006009659A1 (de) * 2005-07-25 2007-02-01 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung für eine Brennkraftmaschine mit Kraftstoff-Direkteinspritzung
DE102006021491A1 (de) 2006-05-09 2007-11-15 Robert Bosch Gmbh Kraftstoffinjektor mit direkt betätigbarer Düsennadel

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2955366A1 (fr) * 2014-06-13 2015-12-16 Robert Bosch Gmbh Ensemble de buses pour un injecteur de carburant et injecteur de carburant

Also Published As

Publication number Publication date
DE102014201850A1 (de) 2015-08-06
EP2905458B1 (fr) 2016-09-07

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