WO2016082986A2 - Injecteur de gaz à propriétes thermiques améliorées - Google Patents

Injecteur de gaz à propriétes thermiques améliorées Download PDF

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Publication number
WO2016082986A2
WO2016082986A2 PCT/EP2015/072307 EP2015072307W WO2016082986A2 WO 2016082986 A2 WO2016082986 A2 WO 2016082986A2 EP 2015072307 W EP2015072307 W EP 2015072307W WO 2016082986 A2 WO2016082986 A2 WO 2016082986A2
Authority
WO
WIPO (PCT)
Prior art keywords
gas injector
valve body
heat dissipation
closing element
combustion chamber
Prior art date
Application number
PCT/EP2015/072307
Other languages
German (de)
English (en)
Other versions
WO2016082986A3 (fr
Inventor
Friedrich Moser
Guenther Hohl
Michael Knorpp
Olaf SCHOENROCK
Sven Krissler
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
Priority to JP2017528566A priority Critical patent/JP6498292B2/ja
Publication of WO2016082986A2 publication Critical patent/WO2016082986A2/fr
Publication of WO2016082986A3 publication Critical patent/WO2016082986A3/fr

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M21/0296—Manufacturing or assembly; Materials, e.g. coatings
    • 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
    • F02M21/0275—Injectors for in-cylinder direct injection, e.g. injector combined with spark plug
    • 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
    • F02M21/029—Arrangement on engines or vehicle bodies; Conversion to gaseous fuel supply systems
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9007—Ceramic materials
    • 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
    • F02M2200/90—Selection of particular materials
    • F02M2200/9046—Multi-layered materials
    • 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
    • F02M53/00—Fuel-injection apparatus characterised by having heating, cooling or thermally-insulating means
    • F02M53/04—Injectors with heating, cooling, or thermally-insulating means
    • F02M53/046—Injectors with heating, cooling, or thermally-insulating means with thermally-insulating means
    • 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 relates to a gas injector for injecting a gaseous fuel directly into a combustion chamber of an internal combustion engine. Furthermore, the present invention relates to an injector with a gas injector. Another aspect of the present invention relates to a
  • Injector assembly includes.
  • gaseous fuels such as e.g. Natural gas or hydrogen
  • gaseous fuels such as e.g. Natural gas or hydrogen
  • Valve body Due to the high thermal load, for example, an elastomer with its limited temperature resistance can not be used as a sealing material. Besides the good ones
  • Sealing properties of the elastomer are also its excellent damping properties during the closing process advantageous.
  • the latter is especially important for gas injectors because of the elimination of a
  • the direct injection gas injector according to the invention for injecting a gaseous fuel directly into a combustion chamber of an internal combustion engine having the features of claim 1 has the advantage that a temperature at the combustion chamber side of the gas injector can be significantly reduced. This is inventively by a thermal Protective device reached on the valve body. Thus, a heat load of other components of the gas injector, in particular the sealing seat and the valve closing element, significantly reduced. Furthermore, it is avoided by the thermal protection device that occurs at too hot areas of the gas injector undesirable glow ignition. This includes the
  • Gas injector for injecting a gaseous fuel directly into a combustion chamber, a valve closing element for releasing or
  • the valve body comprises the thermal protection device at a combustion chamber end of the valve body.
  • This also gives the possibility of making the sealing seat of a soft material, e.g. from an elastomer, in particular for outwardly opening gas injectors. Due to the high elastic compliance of such a material with low elastic deformation forces, a gas-tightness of the gas injector can be made possible even with geometric Im perfections over a lifetime.
  • the thermal protector has a heat dissipation cap having a first heat conduction coefficient which is larger than a heat conduction coefficient of the valve body.
  • Gas injector introduced heat efficiently e.g. derived in a cylinder head.
  • the heat-conducting cap is particularly preferably made of a metal,
  • the heat pipe cap by a
  • the thermal protection device has a first thermal protection layer with a second coefficient of thermal conduction, which is smaller than the heat conduction coefficient of the valve body and / or smaller than the first heat conduction coefficient of the heat dissipation cap. This serves to transfer heat from the combustion chamber to the valve body and / or reduce or eliminate the heat dissipation cap. When heat is transferred, it can be dissipated from the heat pipe cap. Thus, a thermal load of the valve body is reduced.
  • the first thermal protective layer is made of ceramic.
  • the first thermal protection layer is on the
  • the first thermal protective layer can be arranged on a front side directed toward the combustion chamber.
  • an inner side of the passage opening along the flow guide may be provided with the first thermal protection layer.
  • the heat dissipation cap on a plate-shaped region, or a plate-shaped base region and a plate-shaped base region disposed on the wall region.
  • the heat pipe cap can be adapted to different valve body shapes.
  • the heat pipe is adjusted depending on the application.
  • the heat dissipation cap preferably has a surface structuring on a contact surface, wherein the contact surface is arranged for a contact between the heat dissipation cap and a cylinder head and is arranged on the heat dissipation cap.
  • the surface structuring comprises a knurling.
  • the heat dissipation cap comprises a heat conductor paste applied to a surface of the heat dissipation cap.
  • the heat conductor paste is introduced into recesses of the knurling of the heat dissipation cap. This enhances heat transfer between the heat dissipation cap and the cylinder head.
  • reducing a gap and / or a metallic contact between the heat dissipation cap and the cylinder head is advantageously a thermal connection of the heat dissipation cap to a
  • valve closing element has a second thermal protection layer with a third coefficient of thermal conduction, which is smaller than the heat conduction coefficient of the valve body and / or smaller than the first coefficient of heat conduction of the heat dissipation cap.
  • a heat input into the combustion-side space of the gas injector, in particular into the valve closing element can be eliminated or reduced.
  • the first protective layer and the second thermal protective layer are formed from the same material.
  • a uniform thermal protection layer at a combustion end of the gas injector is possible. This also results in a cost-effective manufacturing process.
  • a flow cross section between the valve body and the valve closing element is smaller than a flow cross section between the valve closing element and the sealing seat. Since the valve closing element as well as the valve body can be made very precisely, the flow cross sections can be accurately formed. In contrast to a quantitative throttling at the sealing seat, wherein an entire tolerance chain (several
  • Temperature expansion) on the injected fuel quantity play only the diameter manufacturing tolerances of the valve body and the valve closing element a role. Furthermore, the throttle point is not mechanically by stops or by laying the flow-determining throttle point from the sealing seat into an interior of the gas injector
  • a detailed geometry of the valve body and the valve closing element before and after the throttle point can be designed to be optimal for a gas supersonic flow. It is also advantageous if the sealing seat is arranged by a stop region of the valve body with a predetermined distance on the valve body. Thus, the mechanically highly loaded stop area of the valve body is geometrically separated from the sealing point. This allows a small wear on the stop area without the gas injector failing due to leakage.
  • the material of the stop region is preferably hardened and / or coated in order to withstand the high mechanical loads.
  • the present invention relates to an injector assembly
  • a gas injector for injecting a gaseous fuel into a combustion chamber and a cylinder head with a cylinder head opening, in which the gas injector is arranged, wherein a directed toward the combustion chamber end of the gas injector from a combustion chamber side end of the cylinder head opening with predetermined Distance is arranged in the axial direction of the gas injector. This distance can amount to a maximum of three times the diameter of the cylinder head opening.
  • Flow rate is small.
  • the heat transfer from the hot combustion gases to the valve body and the sealing seat is minimized.
  • combustion preferably takes place, so that no unburned fuel components collect, which could then lead to increased hydrocarbon emissions in the exhaust gas.
  • the injector arrangement has a gas injector according to the invention as described above.
  • a further aspect of the present invention relates to an internal combustion engine which comprises a combustion chamber and a direct-injection gas injector or an injector arrangement according to the invention.
  • Figure 1 is a schematic, highly simplified sectional view of a
  • Figure 2 is a schematic, highly simplified sectional view of
  • Figure 3 is a schematic, highly simplified sectional view of a
  • Injector assembly 8 according to a first embodiment of the present invention described in detail.
  • the injector assembly 8 comprises a gas injector 1 for injecting a gaseous fuel into a combustion chamber 9 and a cylinder head 5 with a cylinder head opening 50 of an internal combustion engine, not shown.
  • a gas injector 1 for injecting a gaseous fuel into a combustion chamber 9 and a cylinder head 5 with a cylinder head opening 50 of an internal combustion engine, not shown.
  • Cylinder head opening 50, the gas injector 1 is arranged, wherein a to
  • Combustion chamber 9 directed end 10 of the gas injector 1 of a
  • the combustion chamber side end 51 of the cylinder head opening 50 is arranged at a first predetermined distance 100.
  • the gas injector 1 comprises a valve closing element 2, a
  • Valve body 3 with a passage opening 37, which opens or closes the valve closing element 2, and a sealing seat 4, which between the
  • Valve body 3 and the valve closing element 2 is arranged.
  • the gas injector 1 is in a closed state, wherein the Passage opening 37 is closed by the valve closing element 2.
  • the gas injector 1 in a fully open state, that is, at a maximum stroke of the closing element 2, shown.
  • the valve body 3 has a thermal protection device 31 at a combustion chamber-side end 30 of the valve body 3.
  • the thermal protection device 31 comprises a
  • Heat dissipation cap 32 having a first coefficient of thermal conduction.
  • the thermal protection device 31 has a first thermal protection layer 33 with a second coefficient of thermal conduction.
  • the heat dissipation cap 32 includes a plate-shaped portion 34 which is fixed to the valve body 3 by a welded joint 38.
  • valve closing element 2 with a second thermal
  • Protective layer 20 provided, which has a third coefficient of thermal conduction.
  • the first heat conduction coefficient of the heat dissipation cap 32 is larger than a heat conduction coefficient of the valve body 3. Further, the second one
  • Heat conduction coefficient of the first thermal protection layer 33 is smaller than the heat conduction coefficient of the valve body 3 and smaller than the first
  • Heat conduction coefficient of the heat dissipation cap 32 is equal to the second coefficient of thermal conduction.
  • the heat dissipation cap 32 has on a contact surface 36 a surface structure, not shown, wherein the contact surface 36 is arranged for a contact between the heat dissipation cap 32 and a
  • Cylinder head 5 and is disposed on the heat dissipation cap 32.
  • the surface structuring is designed as a knurling.
  • depressions of the knurling are provided with a heat conductor paste, whereby the heat transfer between the heat dissipation cap 32 and the cylinder head 5 is increased. Furthermore, the sealing seat 4 of a stop portion 11 of the valve body 3 with a second predetermined distance 200 in the axial direction X-X of the
  • the gas injector 1 is shown in an open state, wherein the passage opening 37 is completely released from the valve closing element 2. This state corresponds to a maximum lift of the valve closing element 2.
  • a flow cross section 6 between the valve body 3 and the valve closing element 2 is smaller than a flow cross section 7 between the
  • Valve closure element 2 a temperature can be reduced, especially in the combustion-side region of the gas injector 1. Thus, a thermal load of the valve body 3 and the sealing seat 4 can be avoided.
  • Resetting the gas injector 1 in the cylinder head opening 50 also contributes to the reduced thermal load of the valve body 3 and the sealing seat 4.
  • This together with the resetting of the sealing seat 4 has the consequence that the sealing seat 4 can be formed of a soft material. This is particularly advantageous because a soft material is very good
  • the gas injector 1 of the second exemplary embodiment in FIG. 3 differs fundamentally from the gas injector 1 of the first exemplary embodiment in that the heat dissipation cap 32 has a plate-shaped base region 34 and a wall region 35 arranged on the plate-shaped base region 34.
  • the contact surface 36 between the heat dissipation cap 32 and the cylinder head 5 is formed larger, whereby a heat transfer to
  • Cylinder head is increased. Further, the heat dissipation cap 32 is fixed to the valve body 3 by a caulking connection 39.

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)
  • Manufacturing & Machinery (AREA)
  • Fuel-Injection Apparatus (AREA)

Abstract

L'invention concerne un injecteur de gaz servant à injecter un combustible gazeux directement dans une chambre de combustion (9) d'un moteur à combustion interne, lequel injecteur de gaz comprend un obturateur (2) destiné à ouvrir ou à fermer une ouverture de passage (37), un corps de soupape (3) et un siège d'étanchéité (4) entre le corps de soupape (3) et l'obturateur (2), le corps de soupape (3) comprenant un dispositif de protection thermique (31) à une extrémité (30) du corps de soupape (3) située côté chambre de combustion. L'invention concerne en outre un ensemble injecteur comprenant un injecteur de gaz selon l'invention. Un autre aspect de la présente invention concerne un moteur à combustion interne qui comprend un injecteur de gaz selon l'invention ou un ensemble injecteur selon l'invention.
PCT/EP2015/072307 2014-11-28 2015-09-29 Injecteur de gaz à propriétes thermiques améliorées WO2016082986A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2017528566A JP6498292B2 (ja) 2014-11-28 2015-09-29 改良された熱的特性を有するガスインジェクタ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102014224343.2A DE102014224343A1 (de) 2014-11-28 2014-11-28 Gasinjektor mit verbesserten thermischen Eigenschaften
DE102014224343.2 2014-11-28

Publications (2)

Publication Number Publication Date
WO2016082986A2 true WO2016082986A2 (fr) 2016-06-02
WO2016082986A3 WO2016082986A3 (fr) 2016-07-28

Family

ID=54361047

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2015/072307 WO2016082986A2 (fr) 2014-11-28 2015-09-29 Injecteur de gaz à propriétes thermiques améliorées

Country Status (3)

Country Link
JP (1) JP6498292B2 (fr)
DE (1) DE102014224343A1 (fr)
WO (1) WO2016082986A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2611339A (en) * 2021-09-30 2023-04-05 Brogwarner Luxembourg Automotive Systems S A Injector for gaseous fuel

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020203194A1 (de) 2020-03-12 2021-09-16 Erwin Junker Grinding Technology A.S. Verbrennungskraftmaschine für den betrieb mit gasförmigem kraftstoff, insbesondere wasserstoff, und hochdruckventil zum einbringen von gasförmigem kraftstoff in die verbrennungskraftmaschine
DE102021134495A1 (de) * 2021-12-23 2023-06-29 Liebherr-Components Deggendorf Gmbh Injektor zum Einspritzen von Kraftstoff
DE102022209622A1 (de) * 2022-09-14 2024-03-14 Robert Bosch Gesellschaft mit beschränkter Haftung Gasinjektor mit reduzierten Temperaturen am Dichtsitz

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US3062198A (en) * 1961-11-17 1962-11-06 Nickles Machine Corp Gas engine fuel injection
US3425399A (en) * 1966-05-23 1969-02-04 American Gas Ass Stratified charge gas engine
JPS6041576U (ja) * 1983-08-30 1985-03-23 日産自動車株式会社 直接噴射式燃料噴射弁
JPS62298658A (ja) * 1986-06-19 1987-12-25 Diesel Kiki Co Ltd 燃料噴射ノズル
GB9210115D0 (en) * 1992-05-11 1992-06-24 United Fuels Ltd Improvements in or relating to internal combustion engines
JPH09273451A (ja) * 1996-04-05 1997-10-21 Keehin:Kk 気体燃料噴射弁
AT413136B (de) * 1998-04-03 2005-11-15 Hoerbiger Ventilwerke Gmbh Gasladeventil
JP3918361B2 (ja) * 1999-05-13 2007-05-23 いすゞ自動車株式会社 副室式ガスエンジン
JP3642011B2 (ja) * 2000-07-19 2005-04-27 日産自動車株式会社 圧縮自己着火式内燃機関
JP2007162678A (ja) * 2005-11-16 2007-06-28 Toyota Motor Corp 燃料噴射弁
JP4204057B2 (ja) * 2006-02-03 2009-01-07 三井造船株式会社 ガスエンジン用パイロット燃料噴射弁の冷却装置
EP2636880A1 (fr) * 2012-03-06 2013-09-11 Delphi Automotive Systems Luxembourg SA Joint d'étanchéité de pointe d'un injecteur
EP2775133A1 (fr) * 2013-03-06 2014-09-10 Delphi Automotive Systems Luxembourg SA Un moyen de protection pour une buse d'injecteur

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2611339A (en) * 2021-09-30 2023-04-05 Brogwarner Luxembourg Automotive Systems S A Injector for gaseous fuel
GB2611339B (en) * 2021-09-30 2024-02-21 Borgwarner Luxembourg Automotive Systems S A Injector for gaseous fuel

Also Published As

Publication number Publication date
WO2016082986A3 (fr) 2016-07-28
DE102014224343A1 (de) 2016-06-02
JP6498292B2 (ja) 2019-04-10
JP2017536501A (ja) 2017-12-07

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