WO2024220171A2 - Injecteur de carburant pour carburant gazeux et siège de soupape associé - Google Patents

Injecteur de carburant pour carburant gazeux et siège de soupape associé Download PDF

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Publication number
WO2024220171A2
WO2024220171A2 PCT/US2024/019360 US2024019360W WO2024220171A2 WO 2024220171 A2 WO2024220171 A2 WO 2024220171A2 US 2024019360 W US2024019360 W US 2024019360W WO 2024220171 A2 WO2024220171 A2 WO 2024220171A2
Authority
WO
WIPO (PCT)
Prior art keywords
seat member
valve
plunger
seat
fuel
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.)
Ceased
Application number
PCT/US2024/019360
Other languages
English (en)
Other versions
WO2024220171A3 (fr
Inventor
Raymond PRIMUS
Andrew Jacob Laska
Anthony Allan SHAULL
Ross A. PHILLIPS
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.)
Cummins Inc
Original Assignee
Cummins Inc
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 Cummins Inc filed Critical Cummins Inc
Priority to EP24793203.1A priority Critical patent/EP4698770A2/fr
Priority to CN202480025902.2A priority patent/CN121039386A/zh
Publication of WO2024220171A2 publication Critical patent/WO2024220171A2/fr
Publication of WO2024220171A3 publication Critical patent/WO2024220171A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M21/0218—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
    • F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
    • 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 disclosure relates generally to a fuel injector for providing gaseous fuel for an internal combustion engine and, more particularly, to a valve seat for a fuel injector for gaseous fuel.
  • Fuel injectors for gaseous fuel operated engines inject gaseous fuel into the combustion chambers, intake manifold, intake port, and/or fuel manifold of the engine at precisely controlled quantities, rates, and timing.
  • the injector has to seal the gaseous fuel between injection events. Therefore, there remains a need for the unique apparatuses, systems, and techniques disclosed herein.
  • the present disclosure includes a fuel injector for providing gaseous fuel to one or more downstream components of an engine, such as a combustion chamber, an intake manifold, intake port, or fuel distribution manifold.
  • the fuel injector includes an elongated injector body defining a longitudinally extending fuel passage therein. The fuel passage extends from a gas inlet end to a gas outlet end of the injector body.
  • the fuel injector includes a valve assembly in the fuel passage.
  • the valve assembly includes at least one valve that is selectively opened and closed to control gaseous fuel flow through the fuel passage to the one or more downstream components.
  • the at least one valve includes a valve seat in the fuel passage that is supported in the injector body.
  • the valve seat includes an outer seat member and an inner seat member.
  • the outer seat member includes an outer first end.
  • the inner seat member is located at least partially within the outer seat member.
  • the inner seat member includes an inner first end.
  • the inner first end is spaced inwardly from the outer first end to admit gaseous fuel flow into the space between the outer first end and the inner first end in response to the at least one valve being opened.
  • the at least one valve also includes a plunger that contacts the outer first end of the outer seat member and the inner first end of the inner seat member to close the at least one valve, and the plunger is displaced from the outer first end of the outer seat member and the inner first end of the inner seat member to open the at least one valve.
  • a valve seat for a fuel injector that includes a plunger to engage and disengage the valve seat to selectively provide gaseous fuel flow through the valve seat.
  • the valve seat includes an outer seat member and an inner seat member.
  • the outer seat member includes a body extending between an outer first end and an opposite end, and the body defines an axial bore.
  • the inner seat member is located at least partially within the axial bore of the outer seat member.
  • the inner seat member includes an inner first end. The inner first end is spaced inwardly from the outer first end to admit gaseous fuel flow into the space between the outer first end and the inner first end.
  • a valve assembly for a fuel injector that includes a valve seat and a plunger.
  • the valve seat includes an outer seat member and an inner seat member.
  • the outer seat member includes a body that defines an axial bore.
  • the inner seat member is located at least partially within the axial bore of the outer seat member.
  • the inner seat member is spaced inwardly from the outer seat member to admit gaseous fuel flow into a space between the outer seat member and the inner seat member.
  • the inner seat member includes a guide post extending axially from the inner seat member that guides movement of the plunger toward and away from the valve seat to engage and disengage the valve seat to selectively provide gaseous fuel flow through the space formed by the valve seat.
  • FIG. 1 is a schematic view of a fuel injection system.
  • FIG. 2 is a longitudinal section view illustrating an example fuel injector for an internal combustion engine, according to an embodiment of the present disclosure.
  • FIG. 3 is an exploded section view of a valve seat of the fuel injector of FIG. 2.
  • FIG. 4 is a section view of the valve seat of FIG. 3.
  • FIG. 5 is a perspective sectional view of the valve seat of FIG. 3.
  • FIG. 6 is a plan view of the valve seat of FIG. 3.
  • FIG. 7 is a section view of a valve portion of the fuel injector of FIG. 2 that includes the valve seat of FIG. 3 and a plunger in an open condition.
  • FIG. 8 is a section view of the valve portion of the fuel injector of FIG. 2 that includes the valve seat of FIG. 3 and the plunger in a closed condition.
  • FIG. 9 is a section view of another embodiment valve seat.
  • FIG. 10 is an exploded section view of the valve seat of FIG. 9 with a plunger.
  • FIG. 11 is a section view of the valve seat and plunger of FIG. 10 in a closed position.
  • a fuel injection system 10 including at least one fuel injector 100a, 100b, 100c ... lOOn for one or more downstream components 14 of engine 12, such as a respective combustion chamber, an intake manifold, intake port, or fuel distribution manifold.
  • the at least one fuel injector 100a, 100b, 100c ... lOOn is in fluid communication with a fuel source 16 containing a gaseous fuel 18, and a fuel tank/regulator 20 and/or common rail 22 to distribute fuel to the injectors 100a, 100b, 100c ... lOOn.
  • system 10 may include any number of fuel injectors, including one fuel injector.
  • Pressurized gaseous fuel 18 is supplied to each of the fuel injectors 100a, 100b, 100c ... lOOn from the fuel tank/regulator 20.
  • fuel injectors 100a, 100b, 100c ... lOOn are described with reference to a fuel injector 100, such as shown in FIGs. 2-11.
  • the fuel injector 100 provides gaseous fuel to the one or more downstream components 14.
  • the fuel injector 100 includes an elongated injector body 101 defining a longitudinally extending fuel passage 102 therein.
  • the fuel passage 102 extends from a gas inlet end 104 to a gas outlet end 106 of the body 101.
  • Fuel injector 100 includes a valve assembly 160 in the fuel passage 102.
  • the valve assembly 160 includes at least one valve 162 that is selectively opened and closed to control gaseous fuel flow through the fuel passage 102 to the one or more downstream components.
  • the at least one valve 162 includes a valve seat 168 in the fuel passage 102 that is supported in the injector body 101.
  • the valve seat 168 includes an outer seat member 178 and an inner seat member 180.
  • the outer seat member 178 includes an outer first end 216.
  • the inner seat member 180 is located at least partially within the outer seat member 178.
  • the inner seat member 180 includes an inner first end 218.
  • the inner first end 218 is spaced inwardly from the outer first end 216 to admit gaseous fuel flow into the space or passage 221 between the outer first end 216 and the inner first end 218 in response to the at least one valve 162 being opened.
  • the at least one valve 162 also includes a plunger 166 that contacts the outer first end 216 of the outer seat member 178 and the inner first end 218 of the inner seat member 180 to close the at least one valve 162, and the plunger 166 is displaced from the outer first end 216 of the outer seat member 178 and the inner first end 218 of the inner seat member 180 to open the at least one valve 162.
  • valve seat 168 is provided for fuel injector 100 that includes plunger 166 to engage and disengage the valve seat 168 to selectively provide gaseous fuel flow through the valve seat 168.
  • the valve seat 168 includes outer seat member 178 and inner seat member 180.
  • the outer seat member 178 includes a body 250 extending between outer first end 216 and an opposite end 252, and the body defines an axial bore 258.
  • the inner seat member 180 is located at least partially within the axial bore 258 of the outer seat member 178.
  • the inner seat member 180 includes inner first end 218.
  • the inner first end 218 is spaced inwardly from the outer first end 216 to admit gaseous fuel flow between the outer first end 216 and the inner first end 218.
  • a valve assembly 360 is provided for fuel injector 100 that includes a valve seat 368 and a plunger 366.
  • the valve seat 368 includes an outer seat member 378 and an inner seat member 380.
  • Outer seat member 378 includes a body that defines an axial bore 452.
  • Inner seat member 380 is located at least partially within axial bore 452 of outer seat member 378. Inner seat member 380 is spaced inwardly from outer seat member 378 to admit gaseous fuel flow into a space 442 between outer seat member 378 and inner seat member 380. Inner seat member 380 includes a guide post 390 extending axially from inner seat member 380 that guides movement of plunger toward 366 and away from valve seat 368 to engage and disengage valve seat 368 to selectively provide gaseous fuel flow through valve seat 368.
  • an exemplary injector body 101 for an embodiment of fuel injector 100 extends along a central longitudinal axis A and includes fuel passage 102 that is defined by the injector body 101 from gas inlet end 104 to gas outlet end 106.
  • the longitudinally extending fuel passage 102 receives valve assembly 160 and a valve actuator 170 therein to control gaseous fuel flow from gas inlet end 104 to gas outlet end 106, and to control combustion gas flow from gas outlet end 106 into fuel passage 102.
  • proximal or “proximally” refer to an axial location or upstream direction toward gas inlet end 104
  • distal or distal refers to an axial location or downstream direction toward gas outlet end 106.
  • valve assembly 160 includes a first valve 162 having valve seat 168, and a second valve 164 spaced longitudinally from and distally of first valve 162.
  • second valve 164 may be omitted in certain embodiments, may be provided proximally of first valve 162, and/or my include a valve seat like valve seat 168.
  • Inj ector body 101 can be comprised of multiple parts that are coupled to one another to form injector body 101.
  • injector body 101 includes an outlet part 120 extending from gas outlet end 106, an inlet part 124 extending from gas inlet end 104, and a transition part 122 that connects outlet part 120 and inlet part 124.
  • Other embodiments contemplate an injector body 101 made from a single body part, from two body parts, or from more than two body parts.
  • Inlet part 124 includes a flange 138 to facilitate mounting of the fuel injector 100 on the engine 12. A feature may also be provided on the injector body 101 to facilitate injector mounting. Inlet part 124 also includes a gas passage 140 for receiving gaseous fuel flow into passage 102 of injector body 101. Inlet part 124 may also include a bore 141 for receiving wires (not shown) that are coupled to valve actuator 170.
  • a nozzle 118 is engaged to the end of outlet part 120 with a nozzle coupler 126.
  • a nozzle coupler 126 is not provided.
  • Nozzle 118 may include one or more holes arranged to divert gaseous fuel flow in a desired direction or flow pattern into the one or more downstream components 14.
  • Nozzle 118 can be configured to optimize combustion of the gaseous fuel based on the combustion conditions of engine 12. In an embodiment, nozzle 118 is always open to allow the gaseous fuel flow to exit fuel passage 102, which also allows combustion gases to enter fuel passage 102.
  • the outlet part 120 includes an interior 133 with three stepped regions 128, 130, 132.
  • First stepped region 128 is adjacent to gas outlet end 106 and is coupled to nozzle 118.
  • First stepped region 128 is smallest in diameter, and receives gaseous fuel flow from the opened second valve 164.
  • a second valve 164 may be housed primarily in second stepped region 130, and valve 162 is partially housed in third stepped region 132.
  • Transition part 122 is also engaged to third stepped region 132.
  • transition part 122 includes an insert region 134 that is positioned within and engaged to third stepped region 132, such as by a threaded, welded, press-fit, or other suitable engagement.
  • Transition part 122 also includes a receiving region 136 that receives and engages the inlet part 124, such as by a threaded, welded, press-fit, or other suitable engagement.
  • Flange 138 of inlet part 124 can abut the outer proximal end of transition part 122 at receiving region 136.
  • Fuel injector 100 includes a tube 144 that is located in interior 137 of transition part 122.
  • Tube 144 is engaged end-to-end with inlet part 124 with a tube coupler 146.
  • Any type of coupling device for tube coupler 146 is contemplated.
  • tube coupler 146 includes internal threads to threadingly engage corresponding threads on inlet part 124, and an internal collar to support a flanged proximal end 145 of tube 144.
  • An end seal 142 can be provided in a groove in the end face of inlet part 124 that seals against the abutting end of tube 144.
  • Tube 144 includes a bore 147 that defines a part of fuel passage 102 from inlet part 124 to valve assembly 160.
  • Actuator 170 is also located in interior 137 of transition part 122. Actuator 170 controls the opening of the gaseous fuel flow valve, designated as valve 162.
  • actuator 170 is an electronic actuator, such as a solenoid, that is electronically controlled by energizing and de-energizing a magnetic coil to actively and selectively control opening and closing for valve 162 of valve assembly 160.
  • An actuator retainer 150 is secured to the inner wall of transition part 122, and an actuator mount 152 is positioned between actuator 170 and actuator retainer 150. Tube 144 extends though actuator mount 152 and actuator 170.
  • Valve 162 includes plunger 166 that extends into interior 137 of transition part 122 and around the end of tube 144. Plunger 166 is engaged to, and axially movable toward gas inlet end 104, by actuation of actuator 170. In another embodiment, plunger 166 is axially movable toward gas outlet end 106. In an embodiment, plunger 166 is an armature plunger. In an embodiment, plunger 166 is comprised entirely of the same material. A plunger guide 148 is provided between tube 144 and plunger 166 that helps guide between plunger 166 and tube 144, but allows plunger 166 to axially translate along tube 144 in response to actuation by actuator 170. [0035] Referring further to FIGs.
  • valve seat 168 includes outer seat member 178 and inner seat member 180.
  • outer seat member 178 includes an outer first end 216 with an axial protrusion 217 that sealing contacts plunger 166.
  • inner seat member 180 includes an inner first end 218 with an axial protrusion 219 in sealing contact with the plunger 166 at a second location that is separate from the first location.
  • the axial spacing SI between axial protrusions 217, 219 is as close to 0 as possible, within tolerances, to ensure adequate contact with seal 214, which can be flat, to provide sealing engagement therebetween, such as shown in FIG. 8. In FIGs.
  • valve seat 168 is oriented with outer first end 216 and inner first end 218 oriented toward gas inlet end 104 of inj ector 100. It is contemplated that valve seat 168 may also be oriented in the opposite direction such that outer first end and inner first end 218 are oriented toward gas outlet end 106. [0036] In an embodiment, the axial protrusion 217 on outer first end 216 and the axial protrusion 219 on inner first end 218 form concentric circles that contact plunger 166 at two different radial locations on an end face of plunger 166.
  • Seat passage 221 is formed between axial protrusions 217, 219 since the inner first end 218 of inner seat member 180 is spaced radially inwardly from the outer first end 216 of outer seat member 178.
  • seat passage 221 is a single, annular opening or flow path between outer seat member 178 and inner seat member 180.
  • seat passage 221 is comprised of multiple passages between outer seat member 178 and inner seat member 180.
  • valve seat 168 includes inner seat member 180 having a cylindrical body 240 extending from inner first end 218 to an opposite flanged second end 244.
  • the inner first end 218 includes axial protrusion 219 that contacts the end face 212 of the plunger 166 in the closed position of the first valve 162.
  • inner first end 218 includes a concave depression 224, and axial protrusion 219 extends around depression 224.
  • the cylindrical body 240 includes a sidewall 246 extending between the inner first end 218 and the flanged second end 244.
  • the sidewall 246 extends around an inner bore 248 of the cylindrical body 240, and the inner bore 248 is closed at the inner first end 218 of the cylindrical body 240, and is axially open at the flanged second end 244 of the cylindrical body 240.
  • end 244 of inner seat member 244 omits a radially protruding flange such body 240 is cylindrical from its inner first end 218 to its opposite second end.
  • the cylindrical body 240 includes one or more sidewall openings 222 distributed around the first sidewall 246.
  • the one or more sidewall openings 222 admit gaseous fuel flow from the open first valve 162 that flows into seat passage 221, through sidewall openings 222, and into the inner bore 248 of the first cylindrical body 240.
  • valve seat 168 includes outer seat member 178 having a second cylindrical body 250 extending from outer first end 216 to an opposite second end 252.
  • the inner first end 218 includes axial protrusion 219 that contacts the end face 212 of the plunger 166 in the closed position of the first valve 162.
  • the cylindrical body 250 includes a sidewall 256 extending between the outer first end 216 and the second end 252. The sidewall 256 extends around an axial bore 258 of the cylindrical body 250.
  • Bore 258 is sized to receive cylindrical body 240 of inner seat member 180, with second end 252 supported on flange 244.
  • the outer seat member 178 and inner seat member 180 can additionally or alternatively be coupled to one another with an interference fit, welded connection, adhesive connection, etc.
  • Body 252 may also include a groove 260 to receive a seat seal 279 that sealing engages with an internal surface of injector body 101, such as at third stepped region 132.
  • the inner seat member 180 is in radial contact with an inner surface 270 the body 250 of the outer seat member 178 at a location 272 that is distally and axially spaced from the outer and inner first ends 216, 218 and spaced in radial alignment with passage 221.
  • a sealing engagement is provided at location 272 to ensure all gaseous fuel flow is directed out of valve seat 268 through bore 248.
  • plunger 166 is biased toward sealing engagement with valve seat 168 by a valve spring 172.
  • Valve spring 172 contacts a distally facing surface 139 located within interior 137 of transition part 122 adjacent to insert region 134.
  • Valve spring 172 also contacts a proximal side of plunger flange 210 of plunger 166.
  • a buffer 174 is also provide between the distally facing surface 139 of transition part 122 of insert region 134 and plunger flange 210. Buffer 174 can be used to control the amount of axial movement of plunger 166 in response to actuation by actuator 170.
  • valve 162 when valve 162 is closed, buffer 174 does not occupy the entire space between plunger flange 210 and distally facing surface 139, such as shown in FIG. 8.
  • valve spring 172 compresses and the plunger 166 translates axially in the proximal direction until buffer 174 contacts each of plunger flange 210 and distally facing surface 139 to limit or prevent further axial displacement of plunger 166 in the proximal direction.
  • the plunger 166 includes an elongated cylindrical plunger body 230 axially extending from a first end 232 to an opposite second end 234.
  • the first end 232 is engaged to actuator 170, and actuator 170 is operable to move the plunger 166 axially toward and away from the valve seat 168.
  • the second end 234 includes end face 212 with sealing member 214 that sealingly contacts the valve seat 168 while the valve 162 is in the closed position.
  • the axial protrusion 217 on outer first end 216 of outer member 178 and the axial protrusion 219 on inner first end 218 of inner member 280 form concentric circles that contact plunger 166 at two different radial locations around the annular sealing member 214.
  • the elongated body 230 of the plunger 166 includes an axial passage 236 that opens at the proximal first end 232 of the plunger 166 for receiving tube 144 and gaseous fuel flow.
  • Plunger body 230 also includes a chamber 238 at the distal second end 234 of the first plunger 166 that is adjacent to the end face 212.
  • Axial passage 236 opens into chamber 238, chamber 238 opens through end face 212, and sealing member 214 extends around the opening of chamber 238 in end face 212.
  • a plurality of sidewall outlets 220 are distributed around the chamber 238 to allow gaseous fuel flow trans-axially out of the chamber 238, around an exterior of the elongated body 230, and between end face 212 and the first valve seat 168 when the end face 212 is spaced from the first valve seat 168. Gas flow though the opening of chamber 238 at end face 212 may also occur.
  • plunger 166 is lifted or displaced from seat 168 by a stroke having a length that is inversely related to a size of the flow passage 221 to open the at least one valve 162. Said another way, the larger the passage 221 is between outer seat member 278 and inner seat member 280, the less plunger 166 is required to be lifted from seat 168 to provide the same flow of gaseous fuel.
  • the location of passage 221 between the outer perimeter of inner seat member 180 and inner perimeter of outer seat member 178 allows a large diameter opening to be formed that has a small annulus or width. Pressure force areas on the plunger 166 and valve seat 168 can be optimized while employed a short plunger stroke, which can provide improved injector performance.
  • valve seat 168 is located in interior 133 of outlet part 120.
  • Outer seat member 178 is sealingly engaged in third stepped region 132 with seat seal 179.
  • second flanged end 244 additionally or alternatively includes a circumferential seal and/or an end face seal, and is sealingly engaged directly to the fuel injector body 101.
  • Inner seat member 180 is located partially within outer seat member 178. The distal end of inner seat member 180 is supported by a spacer 182 on a proximally facing lip 131 between second stepped region 130 and third stepped region 132 of outlet part 120. The distal end 190 of insert region 134 of transition part 122 may also contact the proximal side of valve seat 168 to axially secure valve seat 168 in injector body 101 against spacer 182.
  • valve spring 172 biases the plunger 166 distally into contact with the valve seat 168.
  • Plunger 166 includes an end face 212 that sealingly contacts the valve seat 168 with the valve 162 in the closed position.
  • the end face 212 including an elastomeric sealing member 214 that is engaged at two locations by the axial protrusions 217, 219 of valve seat 168 in the closed position of the valve 162.
  • Sealing member 214 can be, for example, a ringshaped sealing member that is embedded or inset into a recess in end face 212 of plunger 166.
  • valve 162 When valve 162 is opened, gaseous fuel flow is admitted into the seat passage 221 between the outer first end 216 and the inner first end 218 due to sealing member 214 of plunger 166 breaking contact with the axial protrusions 217, 219 of outer seat member 178 and inner seat member 180, as shown in FIG. 7. With valve 162 open, the gaseous fuel flows out of plunger 166 through plunger sidewall outlets 220, and around the distal second end 234 of plunger 166 and between end face 212 of plunger 166 and outer first end 216 of outer seat member 178, then through the passage 221 between outer first end 216 of outer seat member 178 and inner first end 218 of inner seat member 180.
  • the gaseous fuel enters inner seat member 180 through the one or more sidewall openings 222 of inner seat member 180.
  • the gaseous fuel then exits valve 162 though the distal end opening of inner seat member 180.
  • the actuator 170 is deactivated and valve spring 172 returns plunger 166 into sealing engagement with valve seat 168.
  • valve seat 168 In another embodiment in which valve seat 168 is oriented distally, gaseous fuel flow enters valve seat 168 through the proximally oriented opening of inner bore 248.
  • gaseous fuel flow flows through the sidewall openings 222 of inner seat member 180 then flows through the seat passage 221 between the outer first end 216 and the inner first end 218 into plunger 166 due to sealing member 214 of plunger 166 breaking contact with the axial protrusions 217, 219 of outer seat member 178 and inner seat member 180.
  • fuel injector 100 includes second valve 164.
  • Second valve 164 includes a second valve seat 186 supported on the transition between first stepped region 128 and second stepped region 130.
  • Second valve 164 also includes a second plunger that is axially movable toward and away from second valve set 186 to provide a closed position and open position, respectively, of second valve 164.
  • Second valve 164 may include one or more other components as shown but not described herein which are not pertinent to the present disclosure.
  • fuel injector 100 includes only one valve 162 in valve assembly 160.
  • valve assembly 360 is shown that can be employed in a fuel passage of a fuel injector, such as fuel injector 100.
  • the valve assembly 160 includes a valve 362 that is selectively opened and closed to control gaseous fuel flow through the fuel passage 102 to the one or more downstream components 14.
  • Valve 362 includes a plunger 366 and a valve seat 368 positionable in the fuel passage 102 that is supported in the inj ector body 101.
  • valve seat 368 is similar in many respects to valve seat 168, and similar features will not be described in detail.
  • Valve seat 368 includes an outer seat member 378 and an inner seat member 380.
  • the outer seat member 378 includes an outer first end 416.
  • the inner seat member 380 is located at least partially within an axial bore 452 of outer seat member 378.
  • the inner seat member 380 includes an inner first end 418.
  • the inner first end 418 is spaced inwardly from the outer first end 416 to admit gaseous fuel flow into the space or passage 442 between the outer first end 416 and the inner first end 418 in response to valve 362 being opened.
  • Valve 362 also includes plunger 366 with a seal 414 that contacts the outer first end 416 of the outer seat member 378 and the inner first end 418 of the inner seat member 380 to close valve 362. Plunger 366 is displaced from the outer first end 416 of the outer seat member 378 and the inner first end 418 of the inner seat member 380 to open valve 362 and admit gaseous fuel flow through space 442.
  • plunger 366 includes an elongated cylindrical plunger body 430 axially extending from a first, proximal end 432 to an opposite second, distal end 434.
  • the first end 432 is engaged to an actuator, such as actuator 170, and the actuator is operable to move the plunger 366 axially toward and away from the valve seat 368.
  • the second end 434 includes end face 412 with sealing member 414 that sealingly contacts the valve seat 368 while the valve 362 is in the closed position.
  • the elongated body 430 of the plunger 366 includes an axial passage 436 that opens at the proximal first end 432 of the plunger 366 for receiving gaseous fuel flow.
  • One or more sidewall openings 440 are distributed around the body 430 to allow gaseous fuel flow trans-axially into and/or out of the passage 436, and the opening of passage 436 at end face 412.
  • Inner seat member 380 further includes a guide post 390 extending axially in a proximal direction from inner first end 418 of inner seat member 380, through end face 412 of plunger 366, and into a distal bore portion 392 of passage 436 of plunger 366.
  • a guide bushing 394 in distal bore portion bore 392 is positioned around guide post 390 between plunger 366 and guide post 390.
  • Guide bushing 394 guides movement of plunger 366 along the inner diameter of guide post 390. This provides accurate and precise positioning and alignment of plunger 366 relative to valve seat 368 to seal space 442 between the outer and inner seat members 378, 380 of valve seat 368 when valve 362 is to be closed.
  • guide post 390 guides movement of plunger 366 away from valve seat 368 when valve 362 is to be opened.
  • guide post 390 is a cylindrical post including an attached end 396 secured to, or formed integrally with, first end 418 of inner seat member 318.
  • Guide post 390 extends along a length from attached end 396 to an opposite free end 398. The length between ends 396, 398 is sufficient to guide plunger 366 between the open and closed position will preventing wobbling or misalignment between plunger 366 and space 442 of valve seat 368.
  • a fuel injector that provides gaseous fuel to one or more downstream components.
  • the fuel injector includes an elongated injector body defining a longitudinally extending fuel passage therein.
  • the fuel passage extends from a gas inlet end to a gas outlet end of the injector body.
  • the fuel injector includes a valve assembly in the fuel passage.
  • the valve assembly includes at least one valve that is selectively opened and closed to control gaseous fuel flow through the fuel passage to the one or more downstream components.
  • the at least one valve includes a valve seat in the fuel passage that is supported in the injector body.
  • the valve seat includes an outer seat member and an inner seat member.
  • the outer seat member includes an outer first end.
  • the inner seat member located at least partially within the outer seat member.
  • the inner seat member includes an inner first end that is spaced inwardly from the outer first end to admit gaseous fuel flow into the passage between the outer first end and the inner first end in response to the at least one valve being opened.
  • the at least one valve also includes a plunger that contacts the outer first end of the outer seat member and the inner first end of the inner seat member to close the at least one valve. The plunger is displaced from the outer first end of the outer seat member and the inner first end of the inner seat member to open the at least one valve.
  • the plunger includes an end face that contacts the outer first end of the outer seat member and the inner first end of the inner seat member of the valve seat with the at least one valve in the closed position.
  • the end face of the plunger includes an elastomeric sealing member that is engaged by the outer first end of the outer seat member and the inner first end of the inner seat member in the closed position of the at least one valve.
  • the passage between the outer first end of the outer seat member and the inner first end of the inner seat member forms an annular opening between the outer seat member and the inner seat member.
  • the annular opening is circular and has an inner diameter formed by the inner seat member and an outer diameter formed by the outer seat member.
  • the plunger is lifted from the valve seat to open the at least one valve by a stroke having a length that is inversely related to a size of the passage formed at the outer first end of the outer seat member and the inner first end of the inner seat member.
  • the plunger of the at least one valve is displaced toward the gas inlet end to open the at least one valve.
  • the fuel injector includes a second valve configured to control combustion gas flow from the one or more downstream components into the fuel passage through the gas outlet end.
  • the second valve is spaced longitudinally from the first valve toward the gas outlet end.
  • the outer first end of the outer seat member includes a first axial protrusion that contacts the plunger with the at least one valve closed.
  • the inner first end of the inner seat member includes a second axial protrusion that contacts the plunger with the at least one valve closed.
  • a valve seat for a fuel injector that includes a plunger to engage and disengage the valve seat to selectively provide gaseous fuel flow through the valve seat.
  • the valve seat includes an outer seat member and an inner seat member.
  • the outer seat member includes a body extending between an outer first end and an opposite end, and the body defines an axial bore.
  • the inner seat member is located at least partially within the axial bore of the outer seat member.
  • the inner seat member includes an inner first end, and the inner first end is spaced inwardly from the outer first end to admit gaseous fuel flow between the outer first end and the inner first end.
  • the inner seat member includes a cylindrical body extending from the inner first end to an opposite flanged end.
  • the flanged end projects radially outward from the cylindrical body, and the opposite end of the outer seat member is supported on the flanged end of the inner seat member.
  • the cylindrical body of the inner seat member includes a sidewall extending around an inner bore of the inner seat member, and the sidewall includes at least one opening to admit gaseous fuel flow into the inner bore.
  • the inner bore is axially closed at the inner first end of the inner seat member and the inner bore is axially open through the flanged end of the inner seat member.
  • the sidewall includes a plurality of openings spaced around the sidewall of the inner seat member.
  • the body of the outer seat member includes an external groove and a seal in the external groove.
  • the inner seat member is in radial contact with the body of the outer seat member at a location axially spaced from the inner first end and in radial alignment with an annular passage formed between the inner first end and the outer first end.
  • the inner seat member includes a flange that projects radially outwardly from the inner seat member. The opposite end of the outer seat member is in axial contact with the flange.
  • the inner first end of the inner seat member includes a concave depression surrounded by the second protrusion.
  • a valve assembly for a fuel injector includes an electronic actuator, a plunger axially movable with the electronic actuator, and a valve seat configured according to one or more embodiments described herein.
  • a valve assembly for a fuel injector includes a valve seat and a plunger.
  • the valve seat includes an outer seat member defining an axial bore and an inner seat member located at least partially within the axial bore of the outer seat member.
  • the inner seat member is spaced radially inwardly from the outer seat member to admit gaseous fuel flow between the outer seat member and the inner seat member.
  • a guide post extends axially from the inner seat member. The plunger is movable along the guide post to engage and disengage the valve seat to selectively provide gaseous fuel flow through the valve seat.
  • the plunger includes an axially extending inner bore.
  • a guide bushing in the inner bore of the plunger is positioned around the guide post.

Landscapes

  • 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

L'invention concerne un injecteur de carburant pour carburant gazeux. L'injecteur de carburant comprend au moins une soupape ayant un siège de soupape et un piston. Le siège de soupape comprend un élément de siège externe et un élément de siège interne qui est espacé radialement vers l'intérieur de l'élément de siège externe pour définir un passage d'écoulement de combustible gazeux entre eux.
PCT/US2024/019360 2023-04-17 2024-03-11 Injecteur de carburant pour carburant gazeux et siège de soupape associé Ceased WO2024220171A2 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP24793203.1A EP4698770A2 (fr) 2023-04-17 2024-03-11 Injecteur de carburant pour carburant gazeux et siège de soupape associé
CN202480025902.2A CN121039386A (zh) 2023-04-17 2024-03-11 用于气态燃料的燃料喷射器以及用于燃料喷射器的阀门座

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202363496531P 2023-04-17 2023-04-17
US63/496,531 2023-04-17

Publications (2)

Publication Number Publication Date
WO2024220171A2 true WO2024220171A2 (fr) 2024-10-24
WO2024220171A3 WO2024220171A3 (fr) 2025-01-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2024/019360 Ceased WO2024220171A2 (fr) 2023-04-17 2024-03-11 Injecteur de carburant pour carburant gazeux et siège de soupape associé

Country Status (3)

Country Link
EP (1) EP4698770A2 (fr)
CN (1) CN121039386A (fr)
WO (1) WO2024220171A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12385452B2 (en) 2023-04-17 2025-08-12 Cummins Inc. Fuel injector for gaseous fuel and valve assembly for the same

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6065692A (en) * 1999-06-09 2000-05-23 Siemens Automotive Corporation Valve seat subassembly for fuel injector
EP1637730B1 (fr) * 2004-09-17 2014-04-16 Delphi International Operations Luxembourg S.à r.l. Injecteur de combustible et procédé de fabrication
ATE524649T1 (de) * 2007-07-06 2011-09-15 Delphi Tech Holding Sarl Doppelsprüh-einspritzdüse
CN106089500B (zh) * 2016-07-29 2019-09-13 东风商用车有限公司 一种直通式双通道燃气喷射阀
DE102017002366A1 (de) * 2017-03-10 2018-09-13 Liebherr-Components Deggendorf Gmbh Kraftstoffeinspritzventil

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US12385452B2 (en) 2023-04-17 2025-08-12 Cummins Inc. Fuel injector for gaseous fuel and valve assembly for the same

Also Published As

Publication number Publication date
WO2024220171A3 (fr) 2025-01-30
CN121039386A (zh) 2025-11-28
EP4698770A2 (fr) 2026-02-25

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