EP3485160B1 - Système d'injection de carburant et ensemble pour un système d'injection de carburant - Google Patents

Système d'injection de carburant et ensemble pour un système d'injection de carburant Download PDF

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Publication number
EP3485160B1
EP3485160B1 EP17722803.8A EP17722803A EP3485160B1 EP 3485160 B1 EP3485160 B1 EP 3485160B1 EP 17722803 A EP17722803 A EP 17722803A EP 3485160 B1 EP3485160 B1 EP 3485160B1
Authority
EP
European Patent Office
Prior art keywords
fuel
connection
fuel injection
connecting part
holding part
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.)
Active
Application number
EP17722803.8A
Other languages
German (de)
English (en)
Other versions
EP3485160A1 (fr
Inventor
Ingo Rettig
Daniel Schneider
Herbert Blob
Heiko GRUSCHWITZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Priority to PL17722803T priority Critical patent/PL3485160T3/pl
Publication of EP3485160A1 publication Critical patent/EP3485160A1/fr
Application granted granted Critical
Publication of EP3485160B1 publication Critical patent/EP3485160B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/004—Joints; Sealings
    • F02M55/005—Joints; Sealings for high pressure conduits, e.g. connected to pump outlet or to injector inlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M55/00—Fuel-injection apparatus characterised by their fuel conduits or their venting means; Arrangements of conduits between fuel tank and pump F02M37/00
    • F02M55/02—Conduits between injection pumps and injectors, e.g. conduits between pump and common-rail or conduits between common-rail and injectors
    • F02M55/025—Common rails
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/14—Arrangements of injectors with respect to engines; Mounting of 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
    • F02M69/00—Low-pressure fuel-injection apparatus ; Apparatus with both continuous and intermittent injection; Apparatus injecting different types of fuel
    • F02M69/46—Details, component parts or accessories not provided for in, or of interest apart from, the apparatus covered by groups F02M69/02 - F02M69/44
    • F02M69/462—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down
    • F02M69/465—Arrangement of fuel conduits, e.g. with valves for maintaining pressure in the pipes after the engine being shut-down of fuel rails
    • 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
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • F02M2200/8084—Fuel injection apparatus manufacture, repair or assembly involving welding or soldering
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/856—Mounting of fuel injection apparatus characterised by mounting injector to fuel or common rail, or vice versa
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/85—Mounting of fuel injection apparatus
    • F02M2200/857—Mounting of fuel injection apparatus characterised by mounting fuel or common rail to engine

Definitions

  • the invention relates to an arrangement for fuel injection systems for connecting a fuel injection valve to a fuel-carrying component and a fuel injection system with at least one such arrangement.
  • the invention relates to the field of fuel injection systems for internal combustion engines.
  • a connecting part is provided, via which the connecting part that can be connected to the fuel-carrying component can be connected to the holding part.
  • the strip-shaped connecting part is designed as a one-piece deformed part.
  • the strip-shaped connecting part is designed to be largely flat and flat in shape.
  • the connecting part runs parallel on the side exactly facing away from the tubular component along the holding part and the connection part and is accordingly either flat or just linearly attached to these there.
  • the strip-shaped connecting part runs 180 ° opposite the fastening points of the holding part or the connecting part on the fuel distributor pipe.
  • the maximum bending stress of the connecting part on the holding part or on the connection part occurs in the area of the soldering surface or the soldering line, if it is a soldering seam.
  • the connecting part is disadvantageously subjected to compression at the upper edges and tensile stressed at the lower edges.
  • the arrangement according to the invention with the features of claim 1 and the fuel injection system according to the invention with the features of claim 7 have the advantage that an improved configuration is made possible, which in particular enables sufficient voltage optimization at low manufacturing costs.
  • the arrangement according to the invention has the advantage that it enables high mechanical stability and simple assembly.
  • the arrangement and the fuel injection system are particularly suitable for gasoline direct injection applications.
  • the fuel-carrying component is preferably designed as a fuel distributor, in particular as a fuel distributor strip.
  • a fuel distributor can be used, on the one hand, to distribute the fuel to a plurality of fuel injection valves.
  • the individual fuel injection valves are then preferably connected to the fuel distributor via corresponding arrangements. During operation, the fuel injection valves inject the fuel required for the combustion process under high pressure into the respective combustion chamber of the internal combustion engine.
  • connection part on the fuel-carrying component has the advantage that a geometrically close arrangement of the connection part on the fuel-carrying component is made possible, which results in short levers in relation to connection points or connection areas when loads occur.
  • the connection of the connection part to the component is preferably made by a material connection, in particular by hard soldering.
  • the development according to claim 3 has the advantage that a high mechanical stability can be achieved.
  • a force can be introduced both from the connection part and from the holding part directly into the component.
  • the connecting part then leads to a further improvement with regard to the mechanical stresses that occur.
  • the connecting part can form a stiffener between the connecting part and the holding part, which prevents the stresses in the area of a connection, in particular a solder seam, between the connecting part and the component or the holding part and the component from becoming inadmissibly high.
  • the shape and arrangement as well as the position of the connecting part can advantageously achieve that the The highest mechanical stresses no longer occur at the connection point or the connection areas, in particular at the solder seam, but are shifted, for example, into a radius of the connection part. This increases the strength of the overall construction.
  • the connection part can in particular be designed as a valve cup.
  • the holding part can in particular be designed as a holder with a cylindrical recess.
  • the joint between the holding part and the component can be omitted, since the holding part is only connected to the connecting part via the connecting part.
  • an adjustability of a solder gap or the like can advantageously be implemented if, for example, a soldered connection is used, with an overdetermination of the connection or the Connections is avoided.
  • the connecting part is formed from a sheet metal, as proposed in claim 6.
  • the connecting part can be shaped as a stiffening plate.
  • the fuel-carrying component can be a fuel distributor for the direct injection of preferably gasoline, to which several holding parts, several Connecting parts and several connecting parts are mounted in order to realize hydraulic and mechanical connections with, for example, a cylinder head for the individual fuel injectors.
  • the fuel injection system must withstand the loads that occur over its service life. A significant part of the stress is usually caused by the pressure load in the connection parts, in particular valve cups. This is because this is introduced from the connection parts via, for example, a main pipe of the fuel-carrying component into the holding parts and possibly further holding elements and then into the cylinder head. As a result, the joints, which can be designed as soldering points, for example, are heavily stressed.
  • Such joints exist in particular between the holding parts and the fuel-carrying component and between the connection parts and the fuel-carrying component. Due to the principle this can lead to very high voltages at the soldering points. In order to reduce these stresses, the connecting parts are provided. As a result, a one-piece cast construction, each comprising a holding part and a connecting part, can be dispensed with, which enables considerable cost savings. Thus, a stress-optimized design can also be implemented without a cast construction.
  • the arrangement or the arrangements enable an inexpensive and simple holder and valve cup construction that is not designed as a cast construction.
  • the connecting parts stiffen the respective connection between the valve cup and the holding part, the design preferably being such that tensions at connection points, in particular soldering points, between the valve cup and a tubular base body of the fuel-carrying component and, if necessary, between the holding part and the tubular base body are minimized and Stress peaks or maxima of the mechanical stress are preferably placed in the connecting parts. In particular, these can be placed in the provided radii or bends in the connecting parts. This means that the solder seams are relieved and stresses are brought into the connection parts, in particular in connection parts made from sheet metal.
  • a design can be implemented in which small solder gaps, which are typically smaller than 0.3 mm, can be easily achieved.
  • Such a design is particularly suitable for a configuration in which the injector axes, that is to say the longitudinal axes of the fuel injectors, do not intersect a pipe axis, that is to say a longitudinal axis of a tubular base body of the fuel distributor.
  • a voltage-optimized design, a tolerance-optimized design and / or a cost-effective design can thus be implemented.
  • At least one holding part and at least one connecting part can be fastened directly, that is to say without a further intermediate part, to a tubular base body, in particular a main pipe of the fuel-carrying component.
  • One or more connecting parts can advantageously be designed as a formed part. Such a formed part is thereby preferably not attached to the tubular base body and does not touch it either.
  • a connecting part, in particular a formed part can be connected to the holding part on the one hand and to the connecting part on the other hand via a form fit and / or force fit and / or material fit.
  • the connecting part Due to the targeted design of the connecting part, in particular the stiffening plate, it can be freely positioned on the connecting part, in particular a valve cup, and pushed onto the holding part. A solder gap can still be freely adjusted here, with no overdetermination being present.
  • a connection to the holding part and the connection part can each take place on a surface.
  • the shape of the force flow occurring during operation between the holding part and the connecting part can be specified by the design of the connecting part and by the choice of the respective fastening points or fastening areas.
  • the connecting part is preferably not connected directly to the fuel-carrying component, in particular a tubular base body of the fuel-carrying component, or is in contact with it. This means that the connecting part, in particular a stiffening plate, also does not influence the position of the holding part and the connecting part.
  • Fig. 1 shows a fuel injection system 1 with an arrangement 2 in an excerpted, schematic representation corresponding to a first embodiment.
  • the fuel injection system 1 can be used in particular for high pressure injection in internal combustion engines.
  • the fuel injection system 1 can be used in mixture-compressing, externally ignited internal combustion engines.
  • the arrangement 2 is particularly suitable for such a fuel injection system 1.
  • the fuel injection system 1 has a fuel-carrying component 3 which comprises a tubular base body 4. Fuel can be conveyed from a tank 6 under high pressure into the fuel-carrying component 3 via at least one pump 5.
  • the arrangement 2 serves to hydraulically and mechanically connect a fuel injector (not shown) to the fuel-carrying component 3.
  • the arrangement 2 in the shown or at least a modified embodiment can be provided on the fuel-carrying component 3, repeating one or more times, by a corresponding number to connect to component 3 on fuel injectors.
  • the tubular base body 4 of the fuel-carrying component 3 has a longitudinal axis 6 in this exemplary embodiment.
  • the arrangement 2 has a holding part 7, a connecting part 8 and a connecting part 9.
  • An axis 7 'of the holding part 7 does not intersect the longitudinal axis 6, but in the projection into the plane of the drawing shown, the longitudinal axis 6 and the axis 7' intersect at an angle that is given here equal to 90 °.
  • an axis 8 ′ of the connecting part 8 and the longitudinal axis 6 do not intersect, but they intersect at an angle of 90 ° in the projection into the plane of the drawing shown.
  • connection part 8 is designed as a cup 8.
  • the holding part 7 is made from a tubular base material.
  • the connecting part 9 is preferably designed from a shaped piece of sheet metal.
  • a flat connection 10 between the connecting part 9 and the holding part 7 is given, with at suitable points or a material connection, in particular a soldered connection, can be provided in suitable areas.
  • a planar connection 11 is provided between the connection part 9 and an upper side 12 of the connection part 8.
  • cohesive connections, in particular soldered connections can also be configured in places or areas.
  • connection part 8 is connected directly to the tubular base body 4, for example by brazing.
  • a pressure-tight connection is ensured in order to enable fuel to flow into an interior of the connection part 8 configured as a cup 8 when the fuel injection valve is inserted into the connection part 8 with a connection piece along the axis 8 ′.
  • the connecting part 9 is neither connected to the tubular base body 4 nor does it touch the tubular base body 4.
  • the holding part 7 is used in particular for fastening to a cylinder head, a screw or another fastening means being guided along the axis 7 ′ of the holding part 7.
  • the holding part 7 can be connected directly to the tubular base body 4, for example by brazing.
  • a modified embodiment is also conceivable, in which the holding part 7 is not materially connected to the tubular base body 4 and either touches or does not touch the tubular base body 4.
  • the mechanical connection can then be implemented at least essentially via the connecting part 9 and the connecting part 8 in order to indirectly connect the holding part 7 to the tubular base body 4.
  • the fuel injector can thus be hydraulically connected to the connection part 8.
  • the holding part 7 is used for mechanical fastening. If, in the assembled state, the holding part 7 is connected, for example, to a cylinder head of an internal combustion engine, the fuel injector inserted into the connecting part 8 is mechanically fastened in this way. This is because the fuel injector is then fixed between the connecting part 8 and the cylinder head.
  • Fig. 2 shows the in Fig. 1 illustrated fuel injection system 1 according to a second embodiment.
  • the connection part 8 of the arrangement 2 is composed of a cup 15 and an extension 16.
  • a rotationally symmetrical design is selected for both the holding part 7 and the connection part 8.
  • a rotationally symmetrical configuration can also be implemented in a corresponding manner in the case of the holding part 7 and the connection part 8 of the arrangement 2 of the first exemplary embodiment.
  • Fig. 3 shows the in Fig. 2 Fuel injection system 1 shown corresponding to the second exemplary embodiment from the viewing direction labeled III.
  • a region 17 is configured on the connecting part 9, on which the connecting part 9 is bent in order to achieve a tension optimization.
  • Fig. 4 shows a connection part 9 in a spatial representation according to a possible embodiment of the invention.
  • the connecting part 9 is designed to be curved to enable the connection 10 to the holding part 7.
  • the connection part 9 can be designed to be flat or curved to enable the connection 11.
  • Fig. 5 shows a fuel injection system 1 in an excerpt, schematic representation corresponding to a third embodiment.
  • the connecting part 9 designed as a cup 9 is indirectly connected to the tubular base body 4 of the fuel-carrying component 3.
  • an intermediate piece 18 is provided in which a fuel channel 21 formed by holes 19, 20 intersected with one another is implemented. During operation, fuel can be fed to the cup 9 via the fuel channel 21.
  • the connecting part 9 is connected to the intermediate piece 18 in a suitable manner.
  • the connection part 8 is connected to the connection part 9 by means of the intermediate piece 18.
  • a direct connection of the connecting part 9 is provided on the one hand with the connecting part 8 and on the other hand with the holding part 7, as shown in FIG Figs. 1 to 4 is described.
  • an indirect connection is also possible, as is also possible, for example, on the basis of the Fig. 5 is described.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fuel-Injection Apparatus (AREA)

Claims (9)

  1. Dispositif (2) destiné à des systèmes d'injection de carburant pour relier une soupape d'injection de carburant à un composant d'amenée de carburant (3), un élément de retenue (7) étant prévu pour fixer mécaniquement le composant (3) à une culasse, et un élément de raccordement (8) étant prévu auquel l'injecteur de carburant peut être raccordé hydrauliquement, un élément de liaison (9) étant prévu par le biais duquel l'élément de raccordement (8), qui peut être relié au composant d'amenée de carburant (3), peut être relié à l'élément de retenue (7) et l'élément de liaison (9) étant réalisé sous la forme d'un élément de déformation (9) d'une seule pièce,
    caractérisé en ce que
    l'élément de liaison (9) pourvue d'une première portion et d'une deuxième portion est déformé de telle sorte que la première portion de l'élément de liaison (9), laquelle est orientée selon un axe (7') de l'élément de retenue (7), forme une première liaison (10), sensiblement bidimensionnelle, à l'élément de retenue (7) et une deuxième liaison (11), sensiblement bidimensionnelle, est prévue entre la deuxième portion de l'élément de liaison (9) et un côté supérieur (12) de l'élément de liaison (8) et la zone (17) est pliée dans la transition entre la première portion et la deuxième portion.
  2. Dispositif selon la revendication 1, caractérisé en ce que l'élément de raccordement (8) peut être fixé directement au composant d'amenée de carburant (3).
  3. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'élément de retenue (7) peut être fixé directement au composant d'amenée de carburant (3).
  4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que l'élément de retenue (7) n'est pas relié directement au composant d'amenée de carburant (3), mais au moyen d'au moins l'élément de liaison (9) et l'élément de raccordement (8).
  5. Dispositif selon l'une des revendications 1 à 4, caractérisé en ce que l'élément de retenue (7) est formé à partir d'une barre de matériau à symétrie de révolution.
  6. Dispositif selon l'une des revendications précédentes, caractérisé en ce que l'élément de liaison (9) est formé à partir d'au moins une tôle (9).
  7. Système d'injection de carburant (1), destiné notamment à des moteurs à combustion interne, ledit système comprenant au moins un dispositif (2) selon l'une des revendications 1 à 6, l'élément de raccordement (8) étant relié au moins indirectement au composant d'amenée de carburant (3) et l'élément de retenue (7) étant relié à l'élément de raccordement (8) par le biais de l'élément de liaison (9).
  8. Système d'injection de carburant selon la revendication 7, caractérisé en ce que l'élément de liaison (9) n'est pas relié directement au composant d'amenée de carburant (3).
  9. Système d'injection de carburant selon la revendication 7 ou 8, caractérisé en ce que l'élément de liaison (9) ne touche pas le composant d'amenée de carburant (3).
EP17722803.8A 2016-07-15 2017-05-11 Système d'injection de carburant et ensemble pour un système d'injection de carburant Active EP3485160B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL17722803T PL3485160T3 (pl) 2016-07-15 2017-05-11 Układ wtrysku paliwa i układ dla układu wtrysku paliwa

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016212936.8A DE102016212936A1 (de) 2016-07-15 2016-07-15 Brennstoffeinspritzanlage und Anordnung für eine Brennstoffeinspritzanlage
PCT/EP2017/061359 WO2018010870A1 (fr) 2016-07-15 2017-05-11 Système d'injection de carburant et ensemble pour un système d'injection de carburant

Publications (2)

Publication Number Publication Date
EP3485160A1 EP3485160A1 (fr) 2019-05-22
EP3485160B1 true EP3485160B1 (fr) 2021-07-28

Family

ID=58699165

Family Applications (1)

Application Number Title Priority Date Filing Date
EP17722803.8A Active EP3485160B1 (fr) 2016-07-15 2017-05-11 Système d'injection de carburant et ensemble pour un système d'injection de carburant

Country Status (8)

Country Link
US (1) US10947941B2 (fr)
EP (1) EP3485160B1 (fr)
JP (1) JP6906599B2 (fr)
KR (1) KR102324902B1 (fr)
CN (1) CN109477448B (fr)
DE (1) DE102016212936A1 (fr)
PL (1) PL3485160T3 (fr)
WO (1) WO2018010870A1 (fr)

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DE602007002783D1 (de) * 2007-03-08 2009-11-26 Continental Automotive Gmbh Kupplungsvorrichtung und Kraftstoffzufuhranordnung
DE102009006607B4 (de) 2009-01-29 2015-10-08 Benteler Automobiltechnik Gmbh Kraftstoffverteiler
KR101027791B1 (ko) * 2009-08-11 2011-04-07 주식회사 케피코 직분식 연료레일의 마운트 구조체
JP5447138B2 (ja) * 2010-04-22 2014-03-19 マツダ株式会社 高圧燃料配管構造
JP5682787B2 (ja) * 2011-09-26 2015-03-11 株式会社デンソー 燃料噴射装置
JP5912410B2 (ja) * 2011-10-26 2016-04-27 トヨタ自動車株式会社 燃料デリバリパイプ締結構造
KR101160446B1 (ko) * 2012-04-18 2012-06-28 일진제강(주) 연료분사관 연결용 인젝터 컵 유닛 및 그 제조 방법
EP2690281A1 (fr) 2012-07-23 2014-01-29 Continental Automotive GmbH Ensemble de rail de carburant
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EP2910768A1 (fr) 2014-02-25 2015-08-26 Continental Automotive GmbH Ensemble de rail de carburant pour moteur à combustion interne et son procédé de production
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CN107076082B (zh) 2014-11-19 2022-12-20 大陆汽车有限公司 用于内燃机的燃料轨组件
EP3244056B8 (fr) * 2016-05-13 2019-12-18 CPT Group GmbH Une rampe de combustible pour un moteur à combustion interne
CN109328266B (zh) * 2016-06-30 2021-03-23 大陆汽车有限公司 燃料喷射器组件
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Also Published As

Publication number Publication date
US20190249633A1 (en) 2019-08-15
KR20190028438A (ko) 2019-03-18
JP6906599B2 (ja) 2021-07-21
DE102016212936A1 (de) 2018-01-18
CN109477448B (zh) 2021-11-19
CN109477448A (zh) 2019-03-15
PL3485160T3 (pl) 2022-01-10
EP3485160A1 (fr) 2019-05-22
WO2018010870A1 (fr) 2018-01-18
KR102324902B1 (ko) 2021-11-12
JP2019520521A (ja) 2019-07-18
US10947941B2 (en) 2021-03-16

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