EP3149321A1 - Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant - Google Patents

Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant

Info

Publication number
EP3149321A1
EP3149321A1 EP15714533.5A EP15714533A EP3149321A1 EP 3149321 A1 EP3149321 A1 EP 3149321A1 EP 15714533 A EP15714533 A EP 15714533A EP 3149321 A1 EP3149321 A1 EP 3149321A1
Authority
EP
European Patent Office
Prior art keywords
sleeve
nozzle assembly
nozzle
throttle
assembly 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.)
Granted
Application number
EP15714533.5A
Other languages
German (de)
English (en)
Other versions
EP3149321B1 (fr
Inventor
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
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 EP3149321A1 publication Critical patent/EP3149321A1/fr
Application granted granted Critical
Publication of EP3149321B1 publication Critical patent/EP3149321B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • F02M61/205—Means specially adapted for varying the spring tension or assisting the spring force to close the injection-valve, e.g. with 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
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/04—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00 having valves, e.g. having a plurality of valves in series
    • F02M61/10—Other injectors with elongated valve bodies, i.e. of needle-valve type
    • 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
    • F02M2200/28—Details of throttles in fuel-injection apparatus

Definitions

  • the invention relates to a nozzle assembly for a fuel injector for the fuel injector
  • the invention relates to a fuel injector with such a nozzle assembly.
  • Nozzle body includes liftably received nozzle needle.
  • Nozzle needle is acted upon in the closing direction by the spring force of a closing spring which is supported on the one hand on a body component of the fuel injector and on the other hand on a throttle bore body which surrounds the nozzle needle in regions.
  • the throttle bore body in turn is supported on a shoulder of the nozzle needle.
  • In the throttle bore body at least one throttle bore is formed, which serves as a closing throttle and the
  • High-pressure bore in a first and a second portion separates.
  • the throttle bore body surrounding the nozzle needle in some regions has a hydraulically effective area Ai delimiting the first partial area, which is larger is a hydraulically effective area A 2 delimiting the second subarea.
  • the throttle bore body of DE 10 2011 076 665 A1 surrounding the nozzle needle is pressed against a shoulder of the nozzle needle via the spring force of the closing spring and the additionally acting hydraulic pressure force, so that a high sealing effect is provided in the contact region.
  • bypass leakage paths may arise which have the effect of at least one
  • the present invention has for its object to provide a nozzle assembly with a closing throttle, which is optimized efficiency. Furthermore, the nozzle assembly should be simple and inexpensive to produce.
  • the nozzle assembly proposed for a fuel injector includes a nozzle needle which is liftable in a high pressure bore of a nozzle body for releasing and closing at least one injection port
  • the nozzle needle is surrounded in regions by a throttle bore body which, according to the invention, is designed in several parts and comprises at least two sleeves which are guided into one another at least in regions.
  • the merging of the sleeves displaces the leak-prone guide area radially inward, so that already reduces the leakage through the reduced guide diameter becomes.
  • an annular gap which allows a floating in the radial direction storage of the sleeves.
  • the floating mounting in the radial direction allows the compensation of manufacturing and / or assembly tolerances, in particular, an axial offset of the nozzle needle longitudinal axis can be compensated with respect to a sealing seat.
  • the annular gap between the sleeves and the nozzle body causes the pressure p 2 to be applied radially outward and the pressure pi to be radially inward. Since p 2 is smaller than pi, the sleeves are pressed against each other in the radial direction, so that in this way the leakage in the region of the guide is further reduced.
  • the guide clearance between the two sleeves can be minimized in a simple manner to keep the leakage as low as possible and to increase the efficiency of the closing throttle.
  • the closing throttle is formed in the sleeve, which is arranged closer to the injection opening.
  • Hydraulic volume of the second portion of the high-pressure bore is reduced or the mechanical power transmission can be shortened, which has a favorable effect on the response of the moving components and thus promotes a fast needle closing.
  • an axially or obliquely extending bore in the sleeve is provided to form the closing throttle. This measure serves to optimize the flow in the area of the closing throttle.
  • the sleeve which is arranged closer to the injection opening, formed substantially pot-shaped. That is, it has a bottom portion and a hollow cylindrical portion attached thereto. It is also proposed that the sleeve, which is arranged closer to the injection opening, at least partially surrounds the further sleeve. This means that the cup-shaped sleeve guides the further sleeve, wherein the pressure p 2 rests on the inner peripheral side on the further sleeve and the pressure p 2 on the outer peripheral side against the cup-shaped sleeve. The pressure difference leads to a radial expansion of the guided sleeve, so that the guide clearance between the two sleeves is minimized.
  • the sleeve which is arranged closer to the injection opening, is supported in the axial direction on a preferably annular shoulder of the nozzle needle.
  • the nozzle needle can be stepped and / or composed of several parts with different outer diameters.
  • the sleeve in turn, preferably has a support surface resting against the shoulder, which may be formed, for example, on a bottom region of a pot-shaped sleeve. The sleeve engages behind the nozzle needle.
  • the pressure difference in the two subspaces of the high-pressure bore causes a hydraulic pressure force in the axial direction, by means of which at the
  • Nozzle needle supported sleeve is pressed against the shoulder of the nozzle needle.
  • the hydraulic active surface of the sleeve supported on the nozzle needle can be made larger than the hydraulic active surface facing the second partial region of the high-pressure bore.
  • the sleeve is acted upon in the direction of the preferably annular shoulder of the nozzle needle by the spring force of the spring whose spring force acts on the nozzle needle in the closing direction.
  • the sleeve thus replaces a trained on the nozzle needle or connected to the nozzle needle spring plate.
  • the spring is supported on an annular end face of the sleeve.
  • annular space is formed between the nozzle needle and the further sleeve, which is arranged less close to the injection opening.
  • the annulus allows fuel flow in the direction of at least one
  • the further sleeve has a collar section for
  • the collar portion preferably extends radially outward.
  • the collar portion can serve in this way as a spring plate for supporting the spring, the spring force of the nozzle needle, preferably indirectly via the supported on the nozzle needle other sleeve, in
  • the sleeve is radially floating in the high-pressure bore mounted to compensate for any manufacturing and / or assembly tolerances.
  • the floating bearing in the radial direction can be realized in a simple manner on the collar portion of the sleeve for housing-side support.
  • the nozzle needle is stepped.
  • the stepped design simplifies the formation of an annular shoulder for supporting a sleeve of the multi-part throttle body.
  • the nozzle needle preferably has a reduced outer diameter in the region of a section surrounded by the throttle bore body. This ensures that a sleeve supported on this shoulder is pressed against the shoulder via the hydraulic pressure force additionally acting in the closing direction in the flow direction of the fuel.
  • the multi-part throttle bore body may be such that the sleeves cooperate to form a stroke stop.
  • Stroke limit limits the stroke of the nozzle needle, which also has an advantageous effect on a fast needle closing.
  • a first stop surface for example, a bottom surface of a pot-shaped first sleeve and serve as a second stop surface, an annular end face of a guided in the first sleeve second sleeve.
  • the multipart throttle bore body is preferably via one of its sleeves on a body part of the
  • Fuel injector for example, a holding body or an intermediate plate, supported.
  • the body component is plate-shaped and has a central recess for receiving the nozzle needle or a pressure pin which can be coupled to the nozzle needle.
  • the central recess in the body component at the same time serves as an inlet channel.
  • the recess preferably has an inner diameter that is larger than the outer diameter of the nozzle needle or of the pressure pin in this area.
  • the illustrated nozzle assembly comprises a nozzle needle 1, which is received in a liftable manner in a high-pressure bore 2 of a nozzle body 3.
  • a nozzle needle 1 About the lifting movement of the nozzle needle 1 is at least one injection port 4 can be opened and closed. When the injection opening 4 is released, high-pressure fuel enters a combustion chamber of an internal combustion engine
  • the nozzle needle 1 is acted upon by the spring force of a spring 5, which on the one hand on a collar portion 10 of a first sleeve 7.1 and on the other hand on an annular end face 14 of a cup-shaped second sleeve 7 of a multipart executed
  • Throttle bore body 7 is supported.
  • the cup-shaped second sleeve 7.2 is a through a bottom portion 15 of the sleeve 7.2 obliquely
  • Throttle bore formed as a closing throttle 6, which is part of the flow path of the fuel to be injected.
  • the closing throttle 6 causes the Hydraulic pressure pi in a first portion 2.1 of the high pressure bore 2 is greater than the hydraulic pressure p 2 in a second portion 2.2 of the high pressure bore 2 is. The pressure difference in turn leads to a
  • Closing direction acting hydraulic force which acts on the pot-shaped sleeve 7.2 and indirectly via the cup-shaped sleeve 7.2, the nozzle needle 1.
  • the hydraulic force, together with the spring force of the spring 5 causes a quick needle closing.
  • the pot-shaped sleeve 7.2 is for this purpose on an annular shoulder 8 of
  • Paragraph 8 axially biased. The spring force of the spring 5 and the in
  • Closing direction acting hydraulic force cause a sealing force, which largely prevents leakage in the contact region 16 of the sleeve 7.2 with the nozzle needle 1.
  • the pot-shaped sleeve 7.2 surrounds the further sleeve 7.1 of the multi-part
  • Drosselbohrungs stresses 7 partially, so that it is guided over the cup-shaped sleeve 7.2.
  • the guide region 17 represents a further contact area that is usually leaking.
  • the present case the
  • Sleeve 7.1 is flowed through by the fuel to be injected, an annular space 9 is formed between the sleeve 7.1 and the nozzle needle 1, which is part of the flow path of the fuel to be injected. Another leak-tight sealing point is the
  • Bund section 10 of the sleeve 7.1 is supported, the spring force of the spring 5 presses the sleeve 7.1 against the body member 11.
  • the spring force of the spring 5 presses the sleeve 7.1 against the body member 11.
  • the end face of the sleeve 7.1 forms in the present case at the same time a stroke stop 13, when the needle 7.2, the sleeve 7.2 reaches over its bottom portion 15 in contact with serving as a stroke stop 13 face of the sleeve 7.1.
  • the nozzle needle 1 of the illustrated nozzle assembly is stepped and has a portion 12 with reduced outer diameter for receiving the multi-part throttle body 7 and the formation of the annular shoulder 8, on which the cup-shaped sleeve 7.2 of the throttle body 7 is supported.
  • the fuel to be injected flows at this section 12 of the
  • Nozzle needle 1 over in the direction of the closing throttle 6 and passes through the closing throttle 6 in the second portion 2.2 of the high-pressure bore 2.
  • the flow direction of the fuel is indicated by the arrows 19.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un ensemble d'injection destiné à un injecteur de carburant, comprenant une aiguille d'injecteur (1) qui est logée de manière à effectuer un mouvement alternatif dans un alésage haute pression (2) d'un corps d'injecteur (3) pour ouvrir ou fermer au moins un orifice d'injection (4), et qui est au moins indirectement soumise dans la direction de fermeture à la force d'un ressort (5), l'aiguille d'injecteur (1) étant entourée au moins dans certaines parties par un élément à orifice d'étranglement pour former au moins un étranglement de fermeture (6). Selon l'invention, l'élément à orifice d'étranglement (7) est réalisé en plusieurs parties et comprend au moins deux douilles (7.1, 7.2) guidées l'une dans l'autre au moins dans certaines parties. L'invention concerne par ailleurs un injecteur de carburant muni dudit ensemble d'injection.
EP15714533.5A 2014-05-26 2015-04-13 Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant Not-in-force EP3149321B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014209961.7A DE102014209961A1 (de) 2014-05-26 2014-05-26 Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor
PCT/EP2015/057961 WO2015180883A1 (fr) 2014-05-26 2015-04-13 Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant

Publications (2)

Publication Number Publication Date
EP3149321A1 true EP3149321A1 (fr) 2017-04-05
EP3149321B1 EP3149321B1 (fr) 2019-01-16

Family

ID=52814123

Family Applications (1)

Application Number Title Priority Date Filing Date
EP15714533.5A Not-in-force EP3149321B1 (fr) 2014-05-26 2015-04-13 Ensemble d'injection destiné à un injecteur de carburant et injecteur de carburant

Country Status (6)

Country Link
US (1) US10018169B2 (fr)
EP (1) EP3149321B1 (fr)
KR (1) KR102274062B1 (fr)
CN (1) CN106414992B (fr)
DE (1) DE102014209961A1 (fr)
WO (1) WO2015180883A1 (fr)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102016210228A1 (de) 2016-06-09 2017-12-14 Robert Bosch Gmbh Einspritzdüse
CN106671341A (zh) * 2017-03-03 2017-05-17 湖南精正设备制造有限公司 一种液压弹簧平衡自动喷嘴
DE102018217761A1 (de) * 2018-10-17 2020-04-23 Robert Bosch Gmbh Kraftstoffinjektor
US11585452B2 (en) 2019-12-03 2023-02-21 Woodward, Inc. Fuel nozzle with reduced flow tolerance
DE102020215276A1 (de) * 2020-12-03 2022-06-23 Mahle International Gmbh Ventilkörper für ein Expansionsventil

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19936668A1 (de) * 1999-08-04 2001-02-22 Bosch Gmbh Robert Common-Rail-Injektor
EP1118765A3 (fr) * 2000-01-19 2003-11-19 CRT Common Rail Technologies AG Injecteur de combustible pour moteur à combustion interne
DE10338228A1 (de) * 2003-08-20 2005-03-10 Bosch Gmbh Robert Kraftstoffeinspritzventil für Brennkraftmaschinen
DE102004005456A1 (de) * 2004-02-04 2005-08-25 Robert Bosch Gmbh Kraftstoffinjektor mit direktgesteuertem Einspritzventilglied
DE102005015997A1 (de) * 2004-12-23 2006-07-13 Robert Bosch Gmbh Kraftstoffinjektor mit direkter Steuerung des Einspritzventilgliedes
DE102006036447A1 (de) * 2006-08-04 2008-02-07 Robert Bosch Gmbh Injektor für ein Kraftstoffeinspritzsystem
DE102006036780A1 (de) * 2006-08-07 2008-02-21 Robert Bosch Gmbh Krafstoffinjektor mit direkter Nadelsteuerung und Servoventil-Unterstützung
DE102008001425A1 (de) 2008-04-28 2009-10-29 Robert Bosch Gmbh Kraftstoff-Einspritzvorrichtung
DE102009001704B4 (de) * 2009-03-20 2018-06-28 Robert Bosch Gmbh Kraftstoff-Injektor
US8201543B2 (en) * 2009-05-14 2012-06-19 Cummins Intellectual Properties, Inc. Piezoelectric direct acting fuel injector with hydraulic link
DE102011076665A1 (de) 2011-05-30 2012-12-06 Robert Bosch Gmbh Düsenbaugruppe für einen Kraftstoffinjektor sowie Kraftstoffinjektor

Also Published As

Publication number Publication date
WO2015180883A1 (fr) 2015-12-03
US20170184065A1 (en) 2017-06-29
DE102014209961A1 (de) 2015-11-26
US10018169B2 (en) 2018-07-10
EP3149321B1 (fr) 2019-01-16
CN106414992A (zh) 2017-02-15
KR102274062B1 (ko) 2021-07-08
KR20170012365A (ko) 2017-02-02
CN106414992B (zh) 2019-11-22

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