WO2017153170A1 - Ensemble buse pour injecteur de carburant servant à l'injection d'un carburant gazeux et/ou liquide, et injecteur de carburant - Google Patents

Ensemble buse pour injecteur de carburant servant à l'injection d'un carburant gazeux et/ou liquide, et injecteur de carburant Download PDF

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Publication number
WO2017153170A1
WO2017153170A1 PCT/EP2017/054046 EP2017054046W WO2017153170A1 WO 2017153170 A1 WO2017153170 A1 WO 2017153170A1 EP 2017054046 W EP2017054046 W EP 2017054046W WO 2017153170 A1 WO2017153170 A1 WO 2017153170A1
Authority
WO
WIPO (PCT)
Prior art keywords
injection valve
valve member
sealing
fuel
nozzle assembly
Prior art date
Application number
PCT/EP2017/054046
Other languages
German (de)
English (en)
Inventor
Bernd Stuke
Olaf Ohlhafer
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 WO2017153170A1 publication Critical patent/WO2017153170A1/fr

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
    • F02M43/00—Fuel-injection apparatus operating simultaneously on two or more fuels, or on a liquid fuel and another liquid, e.g. the other liquid being an anti-knock additive
    • F02M43/04—Injectors peculiar thereto
    • 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
    • F02M45/00—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship
    • F02M45/02—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts
    • F02M45/04—Fuel-injection apparatus characterised by having a cyclic delivery of specific time/pressure or time/quantity relationship with each cyclic delivery being separated into two or more parts with a small initial part, e.g. initial part for partial load and initial and main part for full load
    • F02M45/08—Injectors peculiar thereto
    • F02M45/086—Having more than one injection-valve controlling discharge orifices
    • 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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0686—Injectors
    • F02D19/0694—Injectors operating with a plurality of fuels
    • 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
    • F02M2200/16—Sealing of fuel injection apparatus not otherwise provided for
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

Definitions

  • Nozzle assembly for a fuel injection valve for injecting a gaseous and / or liquid fuel, fuel injection valve
  • the invention relates to a nozzle assembly for a fuel injection valve having the features of the preamble of claim 1. Furthermore, the invention relates to a fuel injection valve for injecting a gaseous and / or liquid
  • Fuel injection valves of the aforementioned type are also known as
  • a dual fuel injector capable of selectively injecting or injecting two different fuels, such as diesel fuel and natural gas.
  • the two-fuel injector comprises a first and a second valve needle. The first
  • Valve needle on the lifting movement of the first injection holes are releasable and closable, is guided in the second valve needle liftable.
  • the second valve needle is designed for this purpose as a hollow needle.
  • All spray holes are formed in a nozzle body which surrounds the valve needles and at the same time forms a sealing seat for the two valve needles.
  • a fuel separator in the form of a sleeve is provided between the two valve needles, which is biased in the axial direction against the nozzle body. In this way, the mixing of diesel fuel and gaseous fuel at the Nozzle tip minimized.
  • the calorific value of the introduced via the gas path fuel volume changes.
  • a low leakage of diesel fuel into the gas region is desirable because the diesel fuel acts as a lubricant due to its significantly higher viscosity and counteracts increased wear on the sensitive surfaces of the gas valve arrangement.
  • the leakage takes place via a gap guide, over which the valve needle for the gaseous fuel is guided in the nozzle body.
  • the pressure of the diesel fuel is higher than the pressure of the gaseous fuel, gaseous fuel is prevented from passing through the gap guide into the area for the diesel fuel.
  • the present invention is therefore based on the object of specifying a nozzle assembly for a fuel injection valve for injecting a gaseous and / or a liquid fuel with improved media separation.
  • the proposed for a fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine nozzle assembly comprises a nozzle body with a guide portion, via which a first injection valve member is guided in a liftable manner.
  • the guide section separates a pressurizable with the gaseous fuel pressure chamber of a loadable with the liquid fuel second pressure chamber through which the first injection valve member is guided.
  • a liftable sealing disk is accommodated in the second pressure chamber, which is axially prestressed in the direction of a sealing surface formed on the outer injection side of the first injection valve member by means of a spring-elastic sleeve-shaped sealing element, which is fluid-tightly connected to the nozzle body in a fluid-tight manner with the sealing disk.
  • the voltage applied to the sealing surface sealing disc thus prevents together with the resilient sleeve-shaped sealing element that liquid fuel passes from the second pressure chamber via the guide portion in the first pressure chamber and thus in the gas area. In this way, a more effective seal is achieved than solely on the gap guidance in the guide section.
  • the biasing force of the resilient sleeve-shaped sealing element serves as a sealing force which holds the sealing washer in contact with the sealing surface on the injection valve member, even if the injection valve member executes a lifting movement.
  • the resilient sleeve-shaped sealing element is formed as a folded or corrugated metal bellows.
  • the required preload force can be applied to the sealing disc in a simple manner via a folded or corrugated metal bellows.
  • a folded or corrugated metal bellows proves to be sufficiently strong against the applied fuel.
  • the elasticity of the metal bellows also allows the compensation of any manufacturing and / or assembly tolerances.
  • the elasticity of the metal bellows helps to compensate for any axial tolerances.
  • the elasticity of the metal bellows allows the alignment of the sealing disc with respect to the sealing surface formed on the injection valve member, so that any parallelism errors can be corrected.
  • the sealing surface formed on the injection valve member is designed as a flat seat.
  • the injection valve member having a collar portion or a paragraph.
  • the welded joint can be created by a circumferential weld, which ensures a high density of the connection.
  • the resilient sleeve-shaped sealing element is welded to both the nozzle body and the sealing disc.
  • the weld on the sealing disc can be placed in such a way that it comes to lie on a diameter which substantially corresponds to the diameter of the sealing seat of the sealing disc, so that the sealing disc is largely pressure balanced. In this case, the sealing disc is pressed regardless of the respective fuel pressures by the biasing force of the resilient sleeve-shaped sealing element against the sealing surface on the injection valve member.
  • the weld seam can be positioned at a diameter which is smaller than the diameter of the sealing seat of the sealing disk, so that an additional hydraulic pressure force acts in the direction of the sealing surface formed on the injection valve member, if the pressure of the liquid fuel is greater than the pressure of the gaseous fuel is.
  • the nozzle body or a body component connected to the nozzle body forms a stop surface for limiting the stroke of the sealing disk.
  • the nozzle body or the body component thus form a stroke stop for the sealing disc, which causes a separation of the sealing disc from the sealing surface when the injection valve member opens beyond the stroke of the sealing disc.
  • the stroke of the sealing disc is smaller than the stroke of the first injection valve member or the sealing contact of the sealing disc on the sealing surface of the stroke of the first injection valve member is dependent.
  • the sealing effect is canceled and liquid fuel can enter the gap guidance of the guide section of the nozzle body, in order to effect the desired lubrication there.
  • the second pressure space that can be acted upon by the liquid fuel is preferably a function of the stroke of the first injection valve member
  • connection to the inlet area ensures that the pressure in the second pressure chamber is the same as in the inlet area.
  • the connection is then stopped when the sealing washer bears against the sealing surface of the injection valve member and not against the stop surface, which forms the stroke stop for the sealing disk. If the sealing washer is against the stop surface, the connection is interrupted in two parts. Instead, a connection of the inlet region with the gap guide of the guide section is preferably produced, so that the liquid fuel serving as lubricant can be removed directly from the inlet region.
  • Nozzle body formed sealing seat cooperates and is axially biased in the direction of the sealing seat.
  • the bias in the axial direction is preferably effected via the spring force of a spring.
  • the spring force of the spring is greater than the biasing force of the resilient sleeve-shaped sealing element to choose to ensure a safe closing.
  • a needle-shaped second injection valve member is received in a liftable manner in an axial bore of the first injection valve member, at least one of its stroke movement formed in the first injection valve member
  • Injection opening is releasable and closable. While the first injection valve member preferably controls the injection of the gaseous fuel, the injection of the liquid fuel can be controlled via the second injection valve member, in such a way that a pure diesel operation of an internal combustion engine is possible.
  • a fuel injection valve for injecting a gaseous and / or liquid fuel into a combustion chamber of an internal combustion engine with a nozzle assembly according to the invention is further provided
  • Fig. 1 is a schematic longitudinal section through an inventive
  • Nozzle assembly in closed position
  • the nozzle assembly shown in FIG. 1 comprises a nozzle body 1, in which a first pressure chamber 4, which can be acted upon by a gaseous fuel, and a second pressure chamber 5, which can be acted upon by a liquid fuel, are formed. Both pressure chambers 4, 5 are separated by a guide section 2, which serves the liftable guidance of a cooperating with a sealing seat 12 injection valve member 3. During a lifting movement of the injection valve member 3, the sealing seat 12 opens and gaseous fuel is injected via the sealing seat 12 into a combustion chamber 16 (see FIG. 2). The supply of the gaseous fuel into the pressure chamber 4 takes place via laterally arranged feed channels 17.
  • an axial bore 13 is formed, in which a further injection valve member 14 is received in a liftable manner. Via the lifting movement of the further injection valve member 14 injection openings 15 are releasable, via which the liquid fuel from the axial bore 13 into the combustion chamber 16 can be injected.
  • the inlet of liquid fuel into the axial bore 13 via an inlet region 11, which is shown only schematically in Figs. 1 and 2.
  • the inlet region 11 is further connected to the pressure chamber 5, so that in the pressure chamber 5, the same pressure as in the inlet region 11 prevails. This is usually above the pressure prevailing in the first pressure chamber 4.
  • a seal is provided which seals a sealingly accommodated in the pressure chamber 5 disc 6 and a resilient sleeve-shaped sealing element 7 in the form of a metal bellows comprises.
  • the metal bellows which on the one hand is fluid-tightly connected with the nozzle body 1, on the other hand with the sealing disk 6, presses the sealing disk 6 against a sealing surface 8, which is formed on a collar portion 18 of the first injection valve member 3.
  • the sealing disk 6 follows the movement of the injection valve member 3, but only until it abuts a stop surface 10, which in the present case is formed on a plate-shaped body component 9 (see FIG. 2). Regardless of the sealing disc 6, the injection valve member 3 is able to continue its stroke. Meanwhile, there is a connection of the inlet region 11 to the guide section 2, so that liquid fuel enters the guide section 2 and causes lubrication, which reduces wear in the region of the guide.

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 buse pour un injecteur de carburant destiné à l'injection d'un carburant gazeux et/ou liquide dans une chambre de combustion d'un moteur à combustion interne, comprenant un corps de buse (1) présentant une première section de guidage (2) dans laquelle un premier organe de commande d'injection (3) est guidé pour effectuer un mouvement de levée, ladite section de guidage (2) séparant une première chambre de pression (4) recevant le carburant gazeux d'une seconde chambre de pression (5) recevant le carburant liquide, à travers lesquelles passe premier organe de commande (3) d'injection. Selon l'invention, une rondelle d'étanchéité (6) mobile en translation est disposée dans la seconde chambre de pression (5), ladite rondelle étant sollicitée axialement en direction d'une surface d'étanchéité (8) formée sur la périphérie externe du premier organe de commande d'injection (3), par un élément d'étanchéité (7) élastique en forme de manchon, qui est raccordé de manière étanche à la rondelle d'étanchéité (6) d'une part, et au corps de buse (1) d'autre part. L'invention concerne en outre un injecteur de carburant doté d'un tel ensemble buse.
PCT/EP2017/054046 2016-03-10 2017-02-22 Ensemble buse pour injecteur de carburant servant à l'injection d'un carburant gazeux et/ou liquide, et injecteur de carburant WO2017153170A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016203916.4 2016-03-10
DE102016203916.4A DE102016203916A1 (de) 2016-03-10 2016-03-10 Düsenbaugruppe für ein Kraftstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Kraftstoffs, Kraftstoffeinspritzventil

Publications (1)

Publication Number Publication Date
WO2017153170A1 true WO2017153170A1 (fr) 2017-09-14

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2017/054046 WO2017153170A1 (fr) 2016-03-10 2017-02-22 Ensemble buse pour injecteur de carburant servant à l'injection d'un carburant gazeux et/ou liquide, et injecteur de carburant

Country Status (2)

Country Link
DE (1) DE102016203916A1 (fr)
WO (1) WO2017153170A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019076524A1 (fr) * 2017-10-17 2019-04-25 Robert Bosch Gmbh Injecteur de dosage de carburant liquide et de carburant gazeux
CN111164290A (zh) * 2017-10-04 2020-05-15 罗伯特·博世有限公司 用于配量两种燃料的喷射阀

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102018203145A1 (de) 2018-03-02 2019-09-05 Robert Bosch Gmbh Düsenbaugruppe für ein Kraftstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Kraftstoffs, Kraftstoffeinspritzventil
DE102018212090A1 (de) 2018-07-19 2020-01-23 Robert Bosch Gmbh Düsenbaugruppe für ein Kraftstoffeinspritzventil zum Einspritzen eines gasförmigen und/oder flüssigen Kraftstoffs, Kraftstoffeinspritzventil

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003104626A1 (fr) * 2002-06-07 2003-12-18 Barrack Combustion Process Pty Ltd Conditionneur de carburant a deux phases
DE102004014198B3 (de) * 2004-03-23 2005-10-13 Siemens Ag Servoventil und Einspritzventil
DE102012012450A1 (de) 2011-06-24 2012-12-27 Caterpillar Inc. Zweikraftstoffinjektor für ein Common-Rail-System
WO2014186892A1 (fr) * 2013-05-21 2014-11-27 Westport Power Inc. Injecteur de carburant
CA2884945A1 (fr) * 2015-03-13 2015-05-15 Michael C. Wickstone Injecteur pour carburant gazeux a actionnement hydraulique

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003104626A1 (fr) * 2002-06-07 2003-12-18 Barrack Combustion Process Pty Ltd Conditionneur de carburant a deux phases
DE102004014198B3 (de) * 2004-03-23 2005-10-13 Siemens Ag Servoventil und Einspritzventil
DE102012012450A1 (de) 2011-06-24 2012-12-27 Caterpillar Inc. Zweikraftstoffinjektor für ein Common-Rail-System
WO2014186892A1 (fr) * 2013-05-21 2014-11-27 Westport Power Inc. Injecteur de carburant
CA2884945A1 (fr) * 2015-03-13 2015-05-15 Michael C. Wickstone Injecteur pour carburant gazeux a actionnement hydraulique

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111164290A (zh) * 2017-10-04 2020-05-15 罗伯特·博世有限公司 用于配量两种燃料的喷射阀
CN111164290B (zh) * 2017-10-04 2022-09-09 罗伯特·博世有限公司 用于配量两种燃料的喷射阀
WO2019076524A1 (fr) * 2017-10-17 2019-04-25 Robert Bosch Gmbh Injecteur de dosage de carburant liquide et de carburant gazeux
CN111226033A (zh) * 2017-10-17 2020-06-02 罗伯特·博世有限公司 用于配量液态和气态燃料的喷射器

Also Published As

Publication number Publication date
DE102016203916A1 (de) 2017-09-14

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