EP4182552A1 - Composant pour un système d'injection et système d'injection pour des moteurs à combustion interne à allumage commandé et à compression du mélange ainsi que procédé de fabrication d'un tel composant - Google Patents

Composant pour un système d'injection et système d'injection pour des moteurs à combustion interne à allumage commandé et à compression du mélange ainsi que procédé de fabrication d'un tel composant

Info

Publication number
EP4182552A1
EP4182552A1 EP21730123.3A EP21730123A EP4182552A1 EP 4182552 A1 EP4182552 A1 EP 4182552A1 EP 21730123 A EP21730123 A EP 21730123A EP 4182552 A1 EP4182552 A1 EP 4182552A1
Authority
EP
European Patent Office
Prior art keywords
connecting piece
edge
injection valve
component
recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP21730123.3A
Other languages
German (de)
English (en)
Inventor
Ingo Rettig
Florian GRENZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of EP4182552A1 publication Critical patent/EP4182552A1/fr
Pending legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • 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
    • F02M61/00—Fuel-injectors not provided for in groups F02M39/00 - F02M57/00 or F02M67/00
    • F02M61/16—Details not provided for in, or of interest apart from, the apparatus of groups F02M61/02 - F02M61/14
    • F02M61/168—Assembling; Disassembling; Manufacturing; Adjusting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M2200/00—Details of fuel-injection apparatus, not otherwise provided for
    • F02M2200/80—Fuel injection apparatus manufacture, repair or assembly
    • 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
    • F02M2200/8023—Fuel injection apparatus manufacture, repair or assembly the assembly involving use of quick-acting mechanisms, e.g. clips
    • 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
    • F02M2200/852—Mounting of fuel injection apparatus provisions for mounting the fuel injection apparatus in a certain orientation, e.g. markings or notches
    • 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
    • F02M2200/853—Mounting of fuel injection apparatus involving use of quick-acting mechanism, e.g. clips
    • 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

Definitions

  • the invention relates to a component, in particular a fuel distributor, for an injection system that is used for mixture-compressing, spark-ignited internal combustion engines.
  • the invention relates to the field of injection systems for motor vehicles, in which fuel is injected directly into the combustion chambers of an internal combustion engine.
  • DE 102018 110342 A1 discloses a fuel distributor with a pressure accumulator pipe, the pressure accumulator pipe having a forged base body. Flange pieces are provided on the base body, which are formed in one piece on the base body by forging from the same material and are provided with assembly openings.
  • the component according to the invention with the features of claim 1 the injection system according to the invention with the features of claim 9 and the method according to the invention with the features of claim 10 have the advantage that an improved design and functionality are made possible.
  • the injection system according to the invention is used for mixture-compressing, spark-ignited internal combustion engines.
  • the injection system according to the invention serves to inject gasoline and/or ethanol and/or comparable fuels and/or for injection a mixture with petrol and/or ethanol and/or comparable fuels.
  • a mixture can be, for example, a mixture with water.
  • the component according to the invention is used for such injection systems.
  • At least the main body of the component is formed from a material which is preferably a high-grade steel, in particular an austenitic high-grade steel.
  • the material can be based on an austenitic stainless steel with the material number 1.4301 or 1.4307 or on a comparable stainless steel.
  • austenitic steels with the material numbers 1.4301, 1.4306, 1.4307 and 1.4404 can be used.
  • Hydraulic connections provided on the base body can each be designed as a high-pressure inlet, high-pressure outlet or other high-pressure connection.
  • the base body is then formed as a forged blank during production and processed further together with a high-pressure inlet, at least one high-pressure outlet that is realized on the connection piece, and optionally one or more other high-pressure connections.
  • An essential difference to a high-pressure rail for self-igniting internal combustion engines consists in the choice of material and the processing, in particular in the forging of a stainless steel.
  • a side height can be specified in such a way that at least a minimum height required for the function of restricting the rotational degree of freedom is realized. If necessary, the specified side height can then be implemented uniformly on several connection pieces of a component. This is advantageous, for example, in a development according to claim 8. In the context of series production, the specified side height, which is at least as large as a minimum height, can then be uniformly specified for a large number of components.
  • connection pieces As well as at the connection pieces of various components arise after forging Tolerance-related fluctuations in the component size and thus in particular deviations between the geometries of the connection pieces.
  • the post-processing after the forging is preferably carried out in such a way that the side surfaces of the recess of the connecting piece have the same configurations.
  • a functionally correct deburring can enable simplified chipping with reduced commissioning, correction and measurement effort in the proposed embodiment.
  • Variations in the geometry of the individual connecting pieces can advantageously be carried out here by means of edge removal of variable size. This is possible in particular in an advantageous development according to claim 3.
  • the post-processing can be based on a function and tolerance analysis in order to ensure the required function and to cover the fluctuations in the component size caused by tolerances.
  • the geometry and/or size of the resulting edge can then vary depending on the deviation in the outer contour of the component. Since the design criterion for processing is ensuring the necessary functional surfaces on the side surfaces, deviations in the geometries of the connection pieces on a fluid distributor or between several fluid distributors in series production result in different geometries of the edges realized.
  • a development according to at least one of claims 4 to 6 is thus advantageously carried out. It is particularly advantageous if the at least one side surface and the edge are realized by a single tool in one process step, as is possible according to the advantageous development according to claim 7 . In a modified configuration, however, the side surfaces and the edge can also be machined with individual tools.
  • FIG. 1 shows an injection system for a mixture-compressing, spark-ignited internal combustion engine with a component designed as a fuel distributor, in a schematic sectional view according to an exemplary embodiment of the invention
  • FIG. 2 shows the detail of the component labeled II in FIG. 1 according to the exemplary embodiment in a detailed, schematic representation
  • FIG. 3 shows a detail of a connecting piece of the component shown in FIG. 2 according to the exemplary embodiment of the invention
  • FIG. 5A and 5B schematic representations of extracts from a connecting piece and another connecting piece of the component shown in FIG. 1 to explain a possible embodiment of the invention.
  • Fig. 1 shows an injection system 1 with a fuel distributor (fluid distributor) 2 in a schematic sectional view according to a first embodiment.
  • the fuel distributor 2 of the fuel injection system 1 is a component 3 designed according to the invention.
  • a high-pressure pump 4 is also provided.
  • the high-pressure pump 4 is connected to the fuel distributor 2 via a fuel line 5 designed as a high-pressure line 5 .
  • a fuel or a mixture with fuel is supplied as a fluid at an input 6 of the high-pressure pump 4 .
  • Fuel distributor 2 serves to store and distribute the fluid to injectors 7 through 10 designed as fuel injectors 7 through 10 and reduces pressure fluctuations and pulsations. Fuel distributor 2 can also be used to dampen pressure pulsations that can occur when fuel injectors 7 to 10 are switched. During operation, high pressures p can occur in an interior 11 of the component 3 at least at times.
  • the fuel distributor 2 has a tubular base body 14 which is formed by forging in one or more stages.
  • the component 3 has a tubular base body 14, a high-pressure inlet 15 and a plurality of high-pressure outlets 16 to 19 provided on the tubular base body hydraulic connections 16 to 19.
  • a pressure sensor connection 20 is provided on the tubular base body 14 .
  • the tubular base body 14, the high-pressure inlet 15, connection pieces 16A to 19A for the high-pressure outlets 16 to 19 and the pressure sensor connection 20 are formed from a forged individual part 14'. The high-pressure inlet 15, the connecting pieces 16A to 19A for the high-pressure outlets 16 to 19 and the pressure sensor connection 20 are thus forged onto the base body 14.
  • the fuel injection valves 7 to 10 are each connected to the high-pressure outlets 16 to 19 of the fuel distributor 2 .
  • a pressure sensor 21 is also provided, which is connected to the pressure sensor connection 20 .
  • the tubular base body 14 is closed at one end 22 by a closure 23 designed as a closure screw 23 in this exemplary embodiment.
  • the end 22 of the tubular base body 14 can be designed as a threaded connector 22A.
  • an axial high-pressure inlet can be provided at the end 22 or at one end 24 instead of the radial high-pressure inlet 15 .
  • the tubular base body 14 or the forged individual part 14' is processed by at least one machining process.
  • a bore 25 is also formed in the tubular base body 14 after forging in order to form the interior space 11 .
  • the fluid supplied to the high-pressure inlet 15 can be distributed via the interior 11 to the fuel injectors 7 to 10 connected to the high-pressure outlets 16 to 19 .
  • bores 26 to 31 are introduced into the forged individual part 14' by machining.
  • the bores 27 to 30 serve as connecting bores 27 to 30 for the high-pressure outlets 16 to 19.
  • the bore 26 serves for the high-pressure inlet 15.
  • the bore 31 serves for the pressure sensor connection 20.
  • an internal thread 22B is provided at the end 22 of the base body 14 cut into the bore 25 so that the threaded socket 22A is formed.
  • bores 32 to 37 can be provided on the high-pressure inlet 15, the connection pieces 16A to 19A of the high-pressure outlets 16 to 19 and the pressure sensor connection 20.
  • the bore 25 is oriented axially with respect to a longitudinal axis 38 .
  • the bores 32 to 37 are oriented radially with respect to the longitudinal axis 38 .
  • An outer side 39 of the base body 14 can be based on a basic shape in the shape of a cylinder jacket.
  • the bores 33 to 36 are oriented radially with respect to the longitudinal axis 38 .
  • the bores 33 to 36 are preferably oriented radially or radially-eccentrically with respect to the longitudinal axis 38 .
  • Mounting axes 40 to 43 for the injectors 7 to 10 are then defined by the bores 33 to 36 in the connecting pieces 16A to 19A.
  • the assembly axes 40 to 43 are then preferably oriented radially or radially-eccentrically with respect to the longitudinal axis 38 .
  • FIG. 2 shows the section of component 3 labeled II in FIG. 1 according to the exemplary embodiment in a detailed, schematic illustration.
  • the injection valve 7 and the connection piece 16A of the high-pressure outlet 16 are selected as examples for the injection valves 7 to 10 and the connection pieces 16A to 19A of the high-pressure outlets 16 to 19 .
  • the injection valve 7 has an inlet connection piece 45 which is inserted into the bore 33 (FIG. 1) of the connection piece 16A during assembly in an assembly direction 46 along the assembly axis 40 .
  • the injector 7 is held against a cylinder head (not shown) counter to the assembly direction 46 by a hold-down device 47 which is supported on an underside 48 of the connecting piece 16A.
  • the injection valve 7 is positioned and held along the mounting axis 40 .
  • degrees of freedom namely rotational degrees of freedom in and against an (arbitrarily) selected direction of rotation 49.
  • rotational degrees of freedom are also restricted in the assembled state.
  • an orientation element 50 of the injection valve 7 engages in a recess 51 of the connecting piece 16A, which is provided on an outer side 52 of the connecting piece 16A.
  • the recess 51 merges into the outside 52 at an edge 53 .
  • the recess 51 is open towards the underside 48 of the connecting piece 16A, so that during assembly the orientation element 50 can be inserted in the mounting direction 46 coaxially with the mounting axis 40 into the recess 51 of the connecting piece 16A.
  • lateral lugs 54, 55 are formed on the orientation element 50 in this exemplary embodiment.
  • FIG. 3 shows a detail of the connecting piece 16A of the component 3 shown in FIG. 2 according to the exemplary embodiment.
  • Fig. 4 shows a section along the section line labeled IV in Fig. 2 through the recess 51 of the Connection piece 16A (right side) in a comparison to another conceivable post-processing (left side) to explain the embodiment of the invention in a schematic representation.
  • a first side surface 56 and a second side surface 57 are provided on the recess 51 .
  • a predetermined side height 58 which is drawn in schematically in FIG. Starting from the recess 51 shown in FIG. 3, the edge 53 is machined, as illustrated in FIG.
  • the right side of Fig. 4 shows the processing of the edge 53 carried out according to a possible embodiment of the invention.
  • the edge 53 is processed in such a way that the side height 58 is guaranteed at least on the first side surface 56 and on the second side surface 57.
  • a situation is shown in which a certain edge height 59 is realized, which does not correspond to the proposed invention.
  • FIG. 5A shows a schematic, excerpt of the connection piece 16A of the component shown in FIG. 1 to explain a possible embodiment of the invention, as it can be provided in the section labeled II. Since the predetermined side height 58 is realized both on the first side surface 56 and on the second side surface 57, there is a variable edge height 60 along the extent of the edge 53.
  • FIG. 5B shows a schematic, excerpted representation of the connecting piece 19A, which is selected here as an example as a further connecting piece 19A, of the component shown in FIG. 1 in the detail marked III to explain a possible embodiment of the invention.
  • a tolerance-related deviation can occur, in which more material is provided on the connecting piece 19A than on the connecting piece 16A.
  • This situation is illustrated in FIG. 4 on the right-hand side by means of a broken line 61 .
  • a situation with more material is also illustrated on the left side of FIG. 4 by a broken line 62. however, the result obtained is not in accordance with the invention.
  • a recess 51' is provided on the outside 52' of the connecting piece 19A, which recess merges into the outside 52' at an edge 53'.
  • a first side surface 56 ′ and a second side surface 57 ′ are again realized with the specified side height 58 .
  • the specified side height 58 can be at least approximately equal to the minimum height for the side surfaces 56, 57.
  • the resulting side height 63 is significantly below the minimum height, while the minimum height in another case it is clearly exceeded by the side height 63'.
  • Such undershooting and overshooting could possibly also occur along the direction 64 on the side faces of an individual connecting piece.
  • the proposed post-processing can thus ensure the function of the recess 51 on the connecting piece 16A, since the side surfaces 56, 57 serving as lateral stop surfaces are always present at a sufficient height.
  • the processing of the edge 53 or deburring can then be defined, taking into account the fluctuations in the external geometry of the connecting piece 16A and the manufacturing tolerances, such that the minimum required side height is always achieved is available.
  • the resulting variable size, in particular the edge height 60, of the processed edge 53 has no effect on the function.
  • the edge 53 can be reworked with a suitable tool angle.
  • the edge 53 can also have a different edge geometry.
  • the edge 53 can also be designed as a rounded edge 53 .
  • An inner edge line 70 which runs between the first side surface 56 or the second side surface 57 and the edge 53, among other things, can then be continuously spaced from a base 71 of the recess 51 in accordance with the specific side height 58 in the proposed embodiment.
  • the connecting piece 16A is reworked in such a way that at least one side surface 56, 57 of the recess 51 of the connecting piece 16A, on which in the assembled state there is contact between the orientation element 50 of the
  • Injection valve 7 and the connecting piece 16A is made possible, is designed with a predetermined side height 58. This applies accordingly to the other connection pieces 16A to 19A.
  • the invention is not limited to the exemplary embodiments described.

Landscapes

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

Abstract

L'invention concerne un composant (3), en particulier un distributeur de fluide (2), pour un système d'injection (1) pour des moteurs à combustion interne à allumage commandé et à compression du mélange, qui sert à doser un fluide sous haute pression, ledit composant comprenant un corps de base (14) et au moins une tubulure de raccordement (16A - 19A) réalisée sur le corps de base (14) et servant à raccorder une soupape d'injection (7 - 10), la soupape d'injection (7 - 10) pouvant être introduite dans un espace de réception (27 - 30) de la tubulure de raccordement (16A - 19A) lors d'un montage le long d'un axe de montage (40 - 43), au moins le corps de base (14) et la tubulure de raccordement (46 - 49) étant réalisés par forgeage en une ou plusieurs étapes, et un évidement (51, 51') étant réalisé au niveau d'un côté extérieur (52, 52') de la tubulure de raccordement (46 - 49), évidement dans lequel un élément d'orientation (50) de la soupape d'injection (7 - 10) s'engage, à l'état monté, afin de limiter un degré de liberté de rotation de la soupape d'injection (7 - 10) autour de l'axe de montage (40-43). Selon l'invention, la tubulure de raccordement (16A - 19A) est soumise à un post-usinage après le forgeage, de telle sorte qu'au moins une face latérale (56, 57, 56', 57') de l'évidement (51, 51') de la tubulure de raccordement (16A - 19A), sur laquelle, à l'état monté, afin de limiter un degré de liberté de rotation dans une direction de rotation sélectionnée (49) autour de l'axe de montage (40 - 43), un contact est permis entre l'élément d'orientation (50) de la soupape d'injection (7 - 10) et la tubulure de raccordement (16A - 19A), est réalisée au moins approximativement avec une hauteur latérale prédéfinie (58). L'invention concerne en outre un système d'injection doté d'un tel composant (3) et un procédé de fabrication d'un tel composant (3).
EP21730123.3A 2020-07-14 2021-05-26 Composant pour un système d'injection et système d'injection pour des moteurs à combustion interne à allumage commandé et à compression du mélange ainsi que procédé de fabrication d'un tel composant Pending EP4182552A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102020208759.8A DE102020208759A1 (de) 2020-07-14 2020-07-14 Komponente für eine Einspritzanlage und Einspritzanlage für gemischverdichtende, fremdgezündete Brennkraftmaschinen sowie Verfahren zur Herstellung solch einer Komponente
PCT/EP2021/064030 WO2022012805A1 (fr) 2020-07-14 2021-05-26 Composant pour un système d'injection et système d'injection pour des moteurs à combustion interne à allumage commandé et à compression du mélange ainsi que procédé de fabrication d'un tel composant

Publications (1)

Publication Number Publication Date
EP4182552A1 true EP4182552A1 (fr) 2023-05-24

Family

ID=76283697

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21730123.3A Pending EP4182552A1 (fr) 2020-07-14 2021-05-26 Composant pour un système d'injection et système d'injection pour des moteurs à combustion interne à allumage commandé et à compression du mélange ainsi que procédé de fabrication d'un tel composant

Country Status (5)

Country Link
US (1) US20230287852A1 (fr)
EP (1) EP4182552A1 (fr)
CN (1) CN116057270A (fr)
DE (1) DE102020208759A1 (fr)
WO (1) WO2022012805A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102020203174A1 (de) * 2020-03-12 2021-09-16 Robert Bosch Gesellschaft mit beschränkter Haftung Komponente für eine Einspritzanlage und Einspritzanlage für gemischverdichtende, fremdgezündete Brennkraftmaschinen sowie Verfahren zur Herstellung solch einer Komponente

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6705292B2 (en) * 2002-04-02 2004-03-16 Siemens Vdo Automotive Corporation Apparatus and method of connecting a fuel injector and a fuel rail
DE102004048401A1 (de) * 2004-10-01 2006-04-06 Robert Bosch Gmbh Niederhalter für eine Brennstoffeinspritzvorrichtung und Brennstoffeinspritzvorrichtung
KR20190001367A (ko) * 2017-06-27 2019-01-04 주식회사 현대케피코 연료레일 인젝터 고정 구조
DE102018110342B4 (de) 2018-04-30 2022-09-01 Benteler Automobiltechnik Gmbh Verfahren zur Herstellung eines Kraftstoffverteilers
CN109139318B (zh) * 2018-08-09 2020-12-11 联合汽车电子有限公司 燃油分配管及其制造方法
DE102019133050A1 (de) * 2019-12-04 2021-06-10 Benteler Automobiltechnik Gmbh Kraftstoffverteiler

Also Published As

Publication number Publication date
DE102020208759A1 (de) 2022-01-20
US20230287852A1 (en) 2023-09-14
CN116057270A (zh) 2023-05-02
WO2022012805A1 (fr) 2022-01-20

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