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WO2025012396A1 - Soupape d'injection pour moteur à combustion interne - Google Patents

Soupape d'injection pour moteur à combustion interne Download PDF

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Publication number
WO2025012396A1
WO2025012396A1 PCT/EP2024/069718 EP2024069718W WO2025012396A1 WO 2025012396 A1 WO2025012396 A1 WO 2025012396A1 EP 2024069718 W EP2024069718 W EP 2024069718W WO 2025012396 A1 WO2025012396 A1 WO 2025012396A1
Authority
WO
WIPO (PCT)
Prior art keywords
pintle
injector
distal
gas injector
gas
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
PCT/EP2024/069718
Other languages
English (en)
Inventor
Jérôme CALONNE
Richard Enters
François DIDIER
Cyrille Lesieur
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.)
Phinia Delphi Luxembourg SARL
Original Assignee
Phinia Delphi Luxembourg SARL
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 Phinia Delphi Luxembourg SARL filed Critical Phinia Delphi Luxembourg SARL
Publication of WO2025012396A1 publication Critical patent/WO2025012396A1/fr
Pending 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
    • 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
    • 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
    • F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
    • 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
    • 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
    • F02M21/0263—Inwardly opening single or multi nozzle valves, e.g. needle valves
    • F02M21/0266—Hollow stem valves; Piston valves; Stems having a spherical tip
    • 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
    • F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
    • F02M21/0239—Pressure or flow regulators therefor
    • 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
    • F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
    • 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 present invention generally relates to a gas injector for injection of gaseous fuel in an internal combustion engine.
  • hydrogen engines are considered as a promising alternative to gasoline or diesel engines. Indeed, emissions from hydrogen internal combustion engines consist mainly of water and do not comprise nearly as much pollutants as those from traditional engines.
  • inspiration is naturally drawn from those of currently available thermal engines, which are typically powered by liquid fuel such as gasoline or diesel.
  • the fuel delivery systems of such liquid fueled combustion engines typically comprise a liquid fuel tank with a low-pressure pump, a high- pressure pump connected thereto, a fuel rail and a plurality of fuel injectors.
  • liquid fueled engines cannot be carelessly used in gaseous fueled internal combustion engines and must instead be adapted to meet specific technical requirements.
  • care must be taken to anticipate possible fuel leaks and/or excessive pressure drops, which occur much more frequently with gaseous fuels than with their liquid counterparts.
  • the present invention provides a gas injector for injection of gaseous fuel in an internal combustion engine.
  • the gas injector extends along an injector axis from a proximal side to a distal side and comprises: an injector body defining a channel extending from a proximal inlet portion to a distal outlet portion having an outlet opening surrounded by a valve seat; an outwardly-opening pintle having a pintle shaft and pintle head; wherein the pintle is movable along the injector axis between a closed position, in which the pintle head engages said outlet valve seat to prevent gas flow through the outlet opening, and an open position, in which the pintle head is distally spaced from the valve seat to enable flow of gas through the outlet opening.
  • the pintle shaft comprises a hollow length extending from the proximal side to the distal side and the pintle comprises a proximal and a distal aperture, thereby defining an axial gas passage between the inlet portion and the outlet portion.
  • At least one of the armature, the pole piece and the spring is arranged so as to surround the pintle at points along the injector axis located strictly between the proximal aperture and the distal aperture. This minimizes flow obstruction.
  • the present invention thus proposes an injector design for gaseous fuel which uses a hollow pintle shaft extending along the injector axis to convey fluid from the inlet portion to the outlet portion.
  • the gas exits the pintle, respectively pintle shaft, at or near its distal end, typically via a lateral aperture upstream of the valve seat.
  • Fuel can thus be forwarded through the injector in a straight channel (provided by the hollow shaft), avoiding flow through components such as armature or springs, hence avoiding pressure drops due to meandering flow paths.
  • the pintle shaft is fixedly connected to the pintle head. That is, the pintle is designed as a single component, although may be built from different parts (which are thus fixedly assembled).
  • valve seat is part of the injector body, which is adapted to be mounted to the engine.
  • the fuel injector comprises a magnetic armature mechanically coupled to the pintle shaft to be axially moveable therewith, and a solenoid configured to selectively generate a magnetic field, thereby displacing the magnetic armature and forcing the pintle into its open position.
  • the magnetic armature may be fixedly attached to the pintle shaft, preferably by welding, although other fixation means may be employed; form combination to axially lock armature and pintle together is also possible.
  • the fuel injector may further comprise a pole piece arranged distally from the armature and/or a spring configured to bias the pintle towards its closed position, the spring being preferably arranged distally from the armature.
  • At least the armature, pole piece and spring are arranged within the injector channel so as to surround the pintle at points along the injector axis located strictly between the proximal aperture and the distal aperture.
  • an inlet member is arranged in the inlet portion and defines an axial gas inlet channel, in which the pintle shaft is clearance fitted.
  • the gas inlet channel preferably comprises a proximal section connecting a distal cylindrical section of smaller cross-sectional area, more preferably via a tapered section, and the pintle shaft is clearance fitted inside the distal cylindrical section.
  • a radial clearance gap between the hollow pintle shaft and the inlet member may be comprised between 5 pm and 15 pm.
  • the inlet member and its distal cylindrical section thus serve as a proximal guide for the motion of the pintle, i.e. by constraining motion of the pintle to the injector axis.
  • the pintle shaft is clearance fitted in the outlet portion.
  • a radial clearance gap between the hollow pintle shaft and the outlet portion may be comprised between 5 pm and 15 pm.
  • the outlet portion thus serves as a distal guide for the motion of the pintle, i.e. by constraining motion of the pintle to the injector axis.
  • the channel includes a distal outlet chamber ending with the outlet opening, and the distal aperture of the pintle is arranged, at least in the closed position, into the outlet chamber.
  • the distal outlet chamber essentially defines a plenum chamber for the gas directly upstream of the valve seat.
  • the injector body comprises a lower body and a seat member, which is affixed to the lower body and comprises the outlet opening and the valve seat.
  • the seat member may be a tubular element mounted in axial continuity of the lower body and having an inwardly protruding proximal edge defining a lower guide for said pintle shaft and inwardly protruding distal edge defining said outlet opening and valve seat.
  • the seat member may define said outlet chamber, the latter having a cross-section greater than the cross-section of the channel in the lower body.
  • the pintle head comprises a pin-shaped attachment portion that is fitted inside a distal axial open end of said pintle shaft, thereby closing the latter.
  • the pintle head may comprise a tubular attachment portion and the distal end of the pintle shaft may be engaged inside or around said tubular attachment portion.
  • the distal aperture may further be arranged in the pintle shaft upstream of the tubular attachment portion; or the distal aperture may be arranged at the level of the tubular attachment and extends through the pintle shaft and tubular attachment.
  • the Invention further provides a fuel delivery system comprising a gaseous fuel tank configured to store pressurized gaseous fuel, and a fuel rail fluidly coupled to at least one fuel injector as described above.
  • the fuel delivery system further comprises pressure regulating means configured to decrease the pressure of fuel flow therethrough, wherein the pressure regulating means is serially connected between the fuel tank and the fuel rail.
  • Fig. 1 is a cross sectional view of an embodiment of the inventive gas injector, in closed position
  • Fig.2 is a detail view of the outlet portion of the gas injector of Fig.1 , in open position;
  • Figs. 3a-d are principle views of alternative configurations of the pintle.
  • Fig. 4 is a schematic view of a gaseous fuel delivery system comprising the inventive gas injector
  • FIG. 1 shows a first embodiment of the gas injector 10 according to the present invention.
  • the gas injector 10 is adapted to inject a gaseous fuel, in particular hydrogen (H2) or natural gas (CH4), into a combustion chamber of an internal combustion engine (not shown).
  • gaseous fuel generally includes combustible fluids which are in their gaseous state when exposed to nominal operating conditions of the injector and the engine, e.g. pressure and temperature.
  • hydrogen gaseous fuel for an ICE
  • it typically consists of a gas with at least 90% hydrogen (H2), preferably pure hydrogen with no more than 2% impurities.
  • the terms fuel, fuel gas and gaseous fuel are used as synonyms.
  • the injector may be referred to as gas injector or fuel injector.
  • the fuel injector 10 is mostly symmetrical about an injector axis A and comprises an injector body 12, which may be made of one or several pieces.
  • the injector body 12 comprises a main body 12a and a lower body 12b, which are here integral but could alternatively be separate parts fixed together.
  • the injector 10 includes an inlet portion 14 on a proximal side P and an outlet portion 18 on a distal side D, where an outlet opening 22 is surrounded by a valve seat 24.
  • the inlet portion 14 is typically fluidly coupled to a fuel rail 106 at the proximal side P for supply of pressurized gaseous fuel to the fuel injector 10.
  • the injector body portion with the outlet portion 18, i.e. the lower body 12b is arranged in a bore in the cylinder head, which opens into a combustion chamber (not shown) of the engine.
  • the injector body 12 defines a channel 20, which extends along injector axis A from the inlet portion 14 to the outlet portion 18.
  • the channel 20 forms an internal, elongate passageway (or cavity) that extends throughout the injector body 12, from an inlet opening 21 to the outlet opening 22.
  • the channel 20 may comprise sections of different shapes or cross-sections along its length. Where the body is made of several pieces, they are assembled together in a gastight manner, such that the channel 20 defines a gas-tight passage.
  • the valve seat 24 defines an annular surface 25 that faces outwardly, i.e. away from the channel 20, and which may typically be a conical surface.
  • a pintle 26 is axially movable between closed and open positions to control flow of gaseous fuel through the outlet opening 22.
  • the pintle 26 comprises a pintle shaft 28, which extends along the injector axis A and is moveably received inside channel 20, and a pintle head 30, which radially protrudes from the pintle shaft 28 at the distal end thereof.
  • Pintle head 30 forms a valve member (or plug) that is adapted to cooperate with the valve seat 24.
  • the pintle head 30 engages the valve seat 24, thereby preventing gas flow through the outlet opening 22. Conversely, when the pintle 26 is in its open position (Fig.2), the pintle head 30 is distally spaced from the valve seat 24, thereby enabling fuel flow through the outlet opening 22. It may be noted that the pintle head 30 is located downstream (in gas flow direction) of the valve seat 24 and the pintle 26 opens in flow direction; hence the fuel injector 10 is said to open outwardly.
  • valve seat is part of the injector body, i.e. the part that forms the outer wall of the injector and by which the injector is mounted to the engine.
  • Reference sign 36 designates a solenoid coil that cooperates with a magnetic armature 32 to actuate the pintle 26.
  • the armature 32 is mechanically coupled to the pintle shaft 28, such that is moves therewith in the direction of the injector axis A.
  • the armature 32 is fixedly attached to the pintle shaft 28, e.g. by welding, press-fit, or screwing, or through form combination.
  • the pintle shaft 28 extends from the pintle head 30 up to the armature 32, and in the presented embodiment extends proximally beyond the armature 32.
  • a coil spring 34 surrounding the pintle shaft 28 is arranged to bias the armature 32 towards the proximal side P, thereby biasing the pintle 26 towards its closed position.
  • the coil spring 34 is arranged distally from the armature 32, with its proximal end engaging the latter and its distal end engaging a shoulder 12.1 formed in the injector body 12.
  • Other spring configurations can be envisaged.
  • the solenoid 36 is energized to create a magnetic field that attracts the armature 32 in the distal direction and causes the pintle 26 to move distally in an open position, when the force due to the magnetic field overcomes the spring force.
  • Reference sign 38 designates a pole piece arranged distally from the armature 32 to enhance and shape the magnetic field. More specifically, the pole piece 38 is arranged between the armature 32 and the lower body 12b, partially surrounding the coil spring 34.
  • a magnetic ring 40 is incorporated in the main body; alternatively, the wall thickness of the main body 12a can be locally reduced to form a so-called magnetic shunt.
  • the pintle shaft 28 comprises a hollow length 28.1 extending from proximal side P to the distal side D.
  • the pintle 26 further comprises a proximal aperture 26.1 and a distal aperture 26.2.
  • the pintle shaft 28 defines an axial gas passage that enables to convey gas from the inlet portion 14 to the outlet portion 18.
  • the pintle shaft 28 is realized as a straight tube having a proximal axial open end which forms the proximal aperture 26.1 , whereas the opposite tube end is closed by the pintle head 30, which is partially inserted in the pintle shaft 28 (a pin-like attachment portion 31 of the pintle head is inserted in pintle shaft 28). Therefore, the distal aperture 26.2 is laterally or radially arranged, here about the distal end of the pintle shaft 28. In the embodiment of Fig.1 , the distal aperture 26.2 is formed by one hole, or typically a number of holes, in the peripheral wall of the pintle shaft 28 proximal to the pintle head 30. The size and number of the holes depend on the desired flow rate.
  • the open position of the pintle 26 is shown in Fig.2.
  • the pintle 26 has moved distally, whereby a flow passage is opened between the pintle head 30 and valve seat through which gaseous fuel is discharged (as indicated by the arrows in Fig.2).
  • the present injector 10 thus provides a design with a straight gas passage extending throughout the injector length. Gas entering the gas passage at the inlet portion 14 exits through the distal aperture 26.2 near the outlet opening 22 and upstream of the valve seat 24. A straight gas passage is thus provided, thereby avoiding significant pressure drops as undergone in conventional designs with solid pintle shafts, where the fuel has to flow around the pintle and through the armature and spring.
  • an inlet member 15 is arranged to close the injector cavity 20 on the proximal side (inserted through opening 21 ) and is sealingly fixed to the injector body 12 by a continuous, gas-tight weld.
  • the inlet member 15 is a globally tubular element defining a central passage 15.1 with a tapering distal section 15.2 ending with a narrow section 15.3, which serves as upper guide for the pintle shaft 28.
  • a small operating clearance exists for guiding the pintle 26 during its reciprocating motions, offering only a small passage for gas.
  • the central passage and narrow section are centered on the injector axis A.
  • a rail adapter 17 is mounted on the inlet member 15, which is an application dependent element for coupling to the rail.
  • Reference sign 42 indicates a resilient member, e.g. of annular shape, that is compressed by the upwardly moving armature 32, thereby reducing the impact speed of the pintle head 30 as it reaches the valve seat 24.
  • This resilient member 42 e.g. a polymer ring, in particular an elastomer
  • This resilient member 42 reduces shocks and seat wear.
  • the gas injector 10 comprises a seat member 23 which is arranged at the distal end of the lower body, partially received in a front recess 19.
  • the seat member 23 has a generally cylindrical shape (coaxial with injector axis A), with a proximal opening 23.2 defined by an inwardly protruding annular edge (or lip) and a distal opening 23.3, likewise defined by the an inwardly protruding annular edge (or lip).
  • the pintle shaft 28 is clearance fitted in the proximal opening 23.2 of the seat member 18 such that the latter is able to axially guide motion of the former along injector axis A, hence forming a lower guide.
  • the distal opening 23.3 of the seat member 23 corresponds to the outlet opening 22 of the injector 10.
  • the valve seat 24 is thus defined by the lower edge so as to surround the distal opening 23.3 1 the outlet opening 22.
  • the clearances between the pintle shaft 28 and the narrow section 15.3 of the inlet portion 14, and between the pintle shaft 28 and the proximal opening 23.2 of the seat member 23 are such that the vast majority of the fuel flowing through the injector 10 flows through the inner volume 28.1 of the pintle shaft 28, the distal aperture 26.2, and the inner volume 23.1 of the seat member 23.
  • These clearances may be of about 5 to 15 pm in radius. Hence only a small fraction of the fuel flowing through the injector 10 flows around the armature 32, pole piece 38 and coil spring 34, which are normally regions of the flow where high pressure drops tend to occur.
  • the injector body 12 and pintle 26 are typically made of metallic material, in particular steel or stainless steel; however, this should not be construed as limiting and other appropriate materials may be employed.
  • the seat member 23 can be made integral with the injector lower body 12b or can be a pre-fabricated piece securely fixed thereon in an air-tight manner, e.g. by welding.
  • the pintle head 30 can be made integral with the pintle shaft 28 or can be a pre-fabricated piece securely fixed thereon, e.g. by interference fit, welding, etc. That is the pintle is typically a single component, although it may be built from different parts.
  • Figure 4 shows a schematic view of a gaseous fuel delivery system 100 comprising a gaseous fuel tank 102, a pressure regulator 104, and a fuel rail 106 coupled to a plurality of inventive gas injectors 10 as described above.
  • the pressure regulator 104 is serially connected between the gaseous fuel tank 102 and the fuel rail 106 by means of piping 108.
  • the pressure regulator is configured to decreases 104 the flow pressure upstream thereof to a nominal working pressure range, e.g. around 5 to 40 bar.
  • the gaseous fuel tank 102 is configured to store pressurized gaseous fuel at pressures of up to 700 bars.
  • Figs 3a-3d possible alternative embodiments of the pintle design are shown, with different configurations for the distal aperture 26.2.
  • the pintle shaft 28 may be inserted in a blind bore formed in the pintle head 30, as shown on figure 3a-c.
  • the distal aperture 26.2 may be formed through both the pintle shaft 28 and the pintle head 30, as shown on figure 3b, the recess may be formed exclusively through the pintle head 30, as shown on figure 3c, and the pintle head 30 may comprise a through-hole surrounding a filled portion of the pintle shaft 28, the filled portion being distal to the distal opening 26.2 and preventing flow through the pintle head 30.

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

Abstract

La présente invention propose une soupape d'injection (10) pour l'injection de carburant gazeux dans un moteur à combustion interne, s'étendant le long d'un axe d'injecteur (A) d'un côté proximal (P) à un côté distal (D) et comprenant un corps d'injecteur (12) définissant un canal (20) s'étendant d'une partie d'entrée proximale (14) à une partie de sortie distale (18) présentant une ouverture de sortie (22) entourée par un siège de soupape (24), et un pivot d'ouverture vers l'extérieur (26) présentant un arbre de pivot (28) et une tête de pivot (30). Le pivot est mobile le long de l'axe d'injecteur entre une position fermée, dans laquelle la tête de pivot vient en prise avec ledit siège de soupape de sortie pour empêcher un écoulement de gaz à travers l'ouverture de sortie, et une position ouverte, dans laquelle la tête de pivot est espacée de manière distale du siège de soupape pour permettre l'écoulement de gaz à travers l'ouverture de sortie. L'arbre de pivot (28) comprend une longueur creuse (28.1) s'étendant du côté proximal au côté distal et le pivot comprend une ouverture proximale (26.1) et une ouverture distale (26.2), définissant ainsi un passage de gaz axial entre la partie d'entrée et la partie de sortie. Au moins l'un élément parmi l'armature (32), la pièce polaire (38) et le ressort (34) est agencé de manière à entourer le pivot (26) en des points le long de l'axe d'injecteur (A) situés strictement entre l'ouverture proximale (26.1) et l'ouverture distale (26.2).
PCT/EP2024/069718 2023-07-12 2024-07-11 Soupape d'injection pour moteur à combustion interne Pending WO2025012396A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB2310710.5 2023-07-12
GB2310710.5A GB2631754B (en) 2023-07-12 2023-07-12 Gas injector for an internal combustion engine

Publications (1)

Publication Number Publication Date
WO2025012396A1 true WO2025012396A1 (fr) 2025-01-16

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/069718 Pending WO2025012396A1 (fr) 2023-07-12 2024-07-11 Soupape d'injection pour moteur à combustion interne

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GB (1) GB2631754B (fr)
WO (1) WO2025012396A1 (fr)

Citations (5)

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Publication number Priority date Publication date Assignee Title
US6484700B1 (en) * 2000-08-24 2002-11-26 Synerject, Llc Air assist fuel injectors
US7159801B2 (en) * 2004-12-13 2007-01-09 Synerject, Llc Fuel injector assembly and poppet
US20140224903A1 (en) * 2011-09-20 2014-08-14 Denso Corporation Fuel injector and method for manufacturing fuel injector
DE102013205624B4 (de) * 2013-03-28 2015-07-09 Continental Automotive Gmbh Ventil zum Einblasen von gasförmigen Kraftstoffen für eine Brennstoffmaschine
DE102020215866A1 (de) * 2020-12-15 2022-06-15 Robert Bosch Gesellschaft mit beschränkter Haftung Gasinjektor zum Einblasen von gasförmigem Kraftstoff

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8616474B2 (en) * 2011-09-09 2013-12-31 Continental Automotive Systems, Inc. High flow outward opening gaseous injector for automotive applications

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6484700B1 (en) * 2000-08-24 2002-11-26 Synerject, Llc Air assist fuel injectors
US7159801B2 (en) * 2004-12-13 2007-01-09 Synerject, Llc Fuel injector assembly and poppet
US20140224903A1 (en) * 2011-09-20 2014-08-14 Denso Corporation Fuel injector and method for manufacturing fuel injector
DE102013205624B4 (de) * 2013-03-28 2015-07-09 Continental Automotive Gmbh Ventil zum Einblasen von gasförmigen Kraftstoffen für eine Brennstoffmaschine
DE102020215866A1 (de) * 2020-12-15 2022-06-15 Robert Bosch Gesellschaft mit beschränkter Haftung Gasinjektor zum Einblasen von gasförmigem Kraftstoff

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