EP4558716A1 - Injecteur de gaz pour injecter un combustible gazeux - Google Patents

Injecteur de gaz pour injecter un combustible gazeux

Info

Publication number
EP4558716A1
EP4558716A1 EP23736307.2A EP23736307A EP4558716A1 EP 4558716 A1 EP4558716 A1 EP 4558716A1 EP 23736307 A EP23736307 A EP 23736307A EP 4558716 A1 EP4558716 A1 EP 4558716A1
Authority
EP
European Patent Office
Prior art keywords
closing element
gas injector
valve needle
clamping body
armature
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.)
Pending
Application number
EP23736307.2A
Other languages
German (de)
English (en)
Inventor
Martin Bernhaupt
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 EP4558716A1 publication Critical patent/EP4558716A1/fr
Pending legal-status Critical Current

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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0251—Details of actuators therefor
    • F02M21/0254—Electric actuators, e.g. solenoid or piezoelectric
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • 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
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0248—Injectors
    • F02M21/0257—Details of the valve closing elements, e.g. valve seats, stems or arrangement of flow passages
    • F02M21/026—Lift valves, i.e. stem operated valves
    • F02M21/0269—Outwardly opening valves, e.g. poppet valves
    • 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
    • F02M61/08—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 the valves opening in direction of fuel flow
    • 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
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/855—Mounting of fuel injection apparatus using clamp elements or fastening means, e.g. bolts or screws
    • 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

  • the invention relates to a gas injector for injecting a gaseous fuel, in particular hydrogen or natural gas or the like, into a combustion chamber, which, in addition to reduced wear, enables advantageous production of a valve needle.
  • Gas injectors are known from the prior art in different designs.
  • One problem area with such gas injectors is, due to their principle, that due to the gaseous medium to be injected, no lubrication through the medium is possible, as is possible, for example, with fuel injectors that inject gasoline or diesel. For this reason, it is known from the applicant's subsequently published DE 10 2021 200 689 A1 to arrange the armature of a magnetic actuator in a lubricant space filled with lubricant.
  • valve needles release an inlet for blowing the gas into, for example, the combustion chamber of an internal combustion engine.
  • valve needles Due to the principle, such valve needles have a relatively long overall length.
  • valve needles which have a relatively large overall length, can only be manufactured with great effort, especially with regard to the desired coaxiality of the valve needles to an upper and lower needle guide. What is problematic here is, for example, a potentially resulting distortion of the valve needle during a heat treatment or a grinding process after the heat treatment.
  • valve needle known from the above-mentioned DE 102021 200689 A1 has two elements joined in the axial direction form the valve needle, the valve needle resting axially on an anchor bolt which is connected to the magnet armature.
  • the two elements of the valve needle are connected to one another, for example, via a press fit.
  • the disadvantage here is the high joining forces, which can lead to chip formation during the pressing process.
  • the diameters of the elements of the valve needle must be made relatively large in order to enable sufficiently high pressing forces. This in turn leads to relatively heavy valve needles.
  • the gas injector according to the invention for blowing in a gaseous fuel with the features of claim 1 has the advantage that it enables relatively simple production of the valve needle while at the same time keeping the valve needle lightweight.
  • the invention is based on the idea of connecting the two elements of the valve needle to one another via a screw connection. As a result, in particular, no high pressing forces are required between the elements of the valve needle and therefore no large diameters of the elements of the valve needle are required.
  • a gas injector according to the invention for blowing in a gaseous fuel therefore comprises a magnetic actuator for actuating an armature, the armature being at least indirectly coupled to a closing element which opens and closes a gas path on a valve seat, the armature being in a closed
  • a lubricant chamber is arranged which is filled with a lubricant, the lubricant ensuring the lubrication of the armature
  • the closing element being part of a valve needle which has at least two elements extending in the direction of a longitudinal axis of the valve needle and adjoining one another, and wherein the at least two elements are connected to each other by a screw connection in the direction of the longitudinal axis.
  • the screw connection preferably has an internal thread on the closing element as the first element and an external thread on the second element of the valve needle connected to the closing element. This takes into account the fact that the closing element typically has a larger diameter than the (second) element of the valve needle that is connected to the closing element and serves to transmit force from the anchor bolt to the closing element.
  • the at least two elements of the valve needle cooperate with a preferably tubular clamping body which radially surrounds the second element, the clamping body being designed to hold the screw connection in the direction of the longitudinal axis with a compressive force acting in the direction of the closing element to apply.
  • a design of the screw connection or the valve needle enables a particularly stiff valve needle, since the clamping body, which is coupled to the two elements of the valve needle, surrounds the two elements radially and thus also increases the diameter of the valve needle.
  • the clamping body ensures that the screw connection between the two elements of the valve needle cannot become loose over the service life of the gas injector.
  • such a clamping body it is at least indirectly fixed to the valve needle in the axial direction by means of a threaded connection on the side facing away from the closing element.
  • centering means for aligning the two elements of the valve needle in the direction of the longitudinal axis are formed on the clamping body and the closing element.
  • the centering means have a spherical section-shaped first region formed on the clamping body or the closing element, which interacts with a second region of opposite design on the closing element or on the clamping body.
  • the centering means comprise an axial guide and a cone seat and a sealing edge between the clamping body and the closing element which interacts with the cone seat.
  • the clamping body is connected to a bellows-shaped element which surrounds the clamping body radially over a portion of its length and which is connected to an element fixed to the housing, wherein the bellows-shaped element limits and seals the lubricant space.
  • the armature has an anchor bolt or is connected to an anchor bolt, one end face of which rests on the facing end face of the valve needle.
  • the armature interacts with a damping device which is arranged on the side facing away from the valve needle.
  • Fig. 1 shows a schematic longitudinal section through a gas injector
  • FIG. 2 shows a portion of the gas injector according to Fig. 1 with a modified connection of two elements of a valve needle, also in longitudinal section.
  • the gas injector 10 shown in FIG. 1 is used to inject a gaseous fuel, in particular hydrogen or natural gas or the like, into the combustion chamber, not shown, of an internal combustion engine.
  • the gas injector 10 has a multi-part housing 12 with a valve body 14.
  • the valve body 14 is connected to an upper end piece 20 of the housing 12 via an installation sleeve 16 and a further sleeve 18.
  • the connection between the installation sleeve 16 and the sleeve 18 and between the sleeve 18 and the end piece 20 takes place in a known manner via clamping nut connections, not shown in detail.
  • the gaseous fuel is supplied via a feed bore 22 formed in the installation sleeve 16, which opens into an annular space 23 between the valve body 14 and the installation sleeve 16.
  • the gaseous fuel reaches a pressure chamber 25 in the valve body 14 via oblique bores 24.
  • the pressure chamber 25 is connected via axial bores 26 to a valve chamber 28, which forms a valve seat 29 on the end face of the gas injector 10 facing away from the end piece 20.
  • the feed bore 22, the annular space 23, the bores 24 and the pressure chamber 25, together with the bores 26 and the valve chamber 30, form a gas path 35 for supplying the gaseous fuel from the feed bore 22 into the combustion chamber.
  • the valve seat 29 cooperates with a multi-part valve needle 30, which is arranged to be movable along a longitudinal axis 32. In the raised position shown in FIG. 1, the valve needle 30 closes the valve seat 29 with a closing element 34 of the valve needle 30.
  • the two elements 36, 37 of the valve needle 30 are connected via a screw connection 40.
  • the screw connection 40 comprises an internal thread 42 formed on the first element 36 or the closing element 34, which cooperates with an external thread 43 formed on the second element 37.
  • the two elements 36, 37 of the valve needle 30 are surrounded radially by a tubular clamping body 44, which consists of two elements, a connecting part 45 and a guide part 46, which connect to one another when viewed in the axial direction or in the direction of the longitudinal axis 32.
  • the connecting part 45 On the side facing the first element 36 or the closing element 34, the connecting part 45 has a spherical section-shaped region 48, which interacts with an oppositely shaped region 49 on the closing element 34 or on the first element 36.
  • the two areas 48, 49 are part of centering means 50, the centering means 50 serving to ensure a coaxial or aligned arrangement of the two elements 36, 37 of the valve needle 30.
  • the connecting part 45 is subjected to an axial force in the direction of the first element 36 or the closing element 34, which is generated via the clamping body 44.
  • the guide part 46 is connected or clamped to the second element 37 by means of a clamping nut 51 as part of a threaded connection and an external thread 52 formed on the second element 37 of the valve needle 30.
  • the first element 36 of the valve needle 30 also has a section 54 with a reduced diameter, which acts in the manner of an expansion screw, i.e. has greater elasticity than the other sections of the first element 37.
  • the connecting part 45 is surrounded radially by a housing-fixed connecting ring 56, which serves to guide the connecting part 45 radially.
  • the connecting part 45 also has a collar 57 on the lower end face facing the first element 36, to which a metallic bellows 58 that radially surrounds the connecting part 45 is attached.
  • the bellows 58 is again at a reduced diameter section with the upper one Connecting ring 56 connected.
  • the bellows 58 delimits and seals a lubricant space 60 towards the gas path 35, with a lubricant (not shown) such as lubricating oil being arranged in the lubricant space 60.
  • the guide part 46 is surrounded radially by a sealing ring 62.
  • a valve closing spring 64 is supported between the sealing ring 62 and the guide part 46 and applies spring force to the valve needle 30 into the closed position shown in FIG.
  • the second element 37 of the valve needle 30 ends just above the clamping nut 51 when viewed in the direction of the longitudinal axis 32.
  • the valve needle 32 rests with its upper end face on the lower end face of an anchor bolt 65.
  • the anchor bolt 65 is connected to an armature 66, which is part of a magnetic circuit with a magnetic actuator 68.
  • the magnetic actuator 68 arranged in the area of the sleeve 18 includes, in addition to the armature 66, an inner pole 69 used to guide the anchor bolt 65, a magnetic coil 70 and an outer pole 72.
  • the magnetic coil 70 can be supplied with power via a connecting cable 74. When the magnetic coil 70 is energized, an opening force acting in the direction of the valve needle 30 is exerted on the armature 66, which moves the valve needle 30 from the closed position shown in FIG. 1 into its open position for injecting the gaseous fuel.
  • the anchor 66 On the side opposite the anchor bolt 65, the anchor 66 has a pin-shaped extension 75, which cooperates with a lifting stop 76, which is arranged in a stationary manner in the connecting piece 20 in a blind hole.
  • a return spring 77 is in turn supported between the stroke stop 76 or the connecting piece 20 and the upper end face of the armature 66 and presses the armature 66 in the direction of the inner pole 69.
  • the return spring 77 is part of a damping device 80 for the armature 66.
  • the area, in which the armature 66 as well as the damping device 80 are arranged, is arranged within the lubricant space 60, so that the lubricant arranged in the lubricant space 60 serves to guide the armature or to lubricate the armature 66 and thus also reduces or prevents the wear of the armature 66.
  • the anchor 66, the inner pole 69, the sealing ring 62 and the connecting ring 56 have bores or passages 82 to 85 running in the direction of the longitudinal axis 32. 2 shows a modified attachment or arrangement between the two elements 36a, 37a of the valve needle 30a.
  • a conical seat 86 is formed on the clamping body 44 or the connecting piece 45a, which interacts with a sealing edge 88 on the first element 36a. Furthermore, the first element 36a projects with a tubular extension 90 into the inner bore 92 of the connecting piece 45a, so that the centering means 50a have an axial
  • the gas injector 10 described so far can be modified or modified in a variety of ways without deviating from the idea of the invention.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Analytical Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de gaz (10) pour injecter un combustible gazeux, comprenant un actionneur magnétique (68) pour faire fonctionner un induit (66), l'induit (66) étant couplé au moins indirectement à un élément de fermeture (34) qui ouvre et ferme une voie de passage de gaz (35) au niveau d'un siège d'injecteur (29), l'induit (66) étant logé dans une chambre à lubrifiant (60) fermée remplie d'un lubrifiant, le lubrifiant assurant la lubrification de l'induit (60), l'élément de fermeture (34) faisant partie d'une aiguille d'injecteur (30; 30a) qui comporte au moins deux éléments (36; 36a, 37; 37a) s'étendant dans la direction de l'axe longitudinal (32) de l'aiguille d'injecteur (30; 30a) et se raccordant l'un à l'autre.
EP23736307.2A 2022-07-20 2023-06-29 Injecteur de gaz pour injecter un combustible gazeux Pending EP4558716A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102022207409.2A DE102022207409A1 (de) 2022-07-20 2022-07-20 Gasinjektor zum Einblasen eines gasförmigen Brennstoffs
PCT/EP2023/067765 WO2024017591A1 (fr) 2022-07-20 2023-06-29 Injecteur de gaz pour injecter un combustible gazeux

Publications (1)

Publication Number Publication Date
EP4558716A1 true EP4558716A1 (fr) 2025-05-28

Family

ID=87070804

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23736307.2A Pending EP4558716A1 (fr) 2022-07-20 2023-06-29 Injecteur de gaz pour injecter un combustible gazeux

Country Status (5)

Country Link
EP (1) EP4558716A1 (fr)
KR (1) KR20250040023A (fr)
CN (1) CN119654482A (fr)
DE (1) DE102022207409A1 (fr)
WO (1) WO2024017591A1 (fr)

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1077496B (de) * 1958-03-29 1960-03-10 Fritz Maus Ventil mit Antrieb durch das abzusperrende Druckmittel und Steuerung durch ein vorzugsweise elektromagnetisches Hilfsventil
DE3641470A1 (de) * 1986-12-04 1988-06-16 Bosch Gmbh Robert Elektromagnetisch betaetigbares kraftstoffeinspritzventil
AT413133B (de) * 1998-02-24 2005-11-15 Hoerbiger Kompressortech Serv Gasventil
JP5551037B2 (ja) * 2010-09-28 2014-07-16 株式会社ディーゼルユナイテッド ガス噴射弁
DE102020208273A1 (de) * 2020-07-02 2022-01-05 Robert Bosch Gesellschaft mit beschränkter Haftung Gasinjektor mit reduziertem Verschleiß
DE102021200689A1 (de) 2021-01-27 2022-07-28 Robert Bosch Gesellschaft mit beschränkter Haftung Gasinjektor mit reduziertem Verschleiß und Dämpfungseinrichtung
DE102021200688A1 (de) 2021-01-27 2022-07-28 Robert Bosch Gesellschaft mit beschränkter Haftung Gasinjektor mit austauschbaren Bauteilen

Also Published As

Publication number Publication date
WO2024017591A1 (fr) 2024-01-25
KR20250040023A (ko) 2025-03-21
CN119654482A (zh) 2025-03-18
DE102022207409A1 (de) 2024-01-25

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