EP4034775A1 - Wellengleitlager - Google Patents
WellengleitlagerInfo
- Publication number
- EP4034775A1 EP4034775A1 EP20771495.7A EP20771495A EP4034775A1 EP 4034775 A1 EP4034775 A1 EP 4034775A1 EP 20771495 A EP20771495 A EP 20771495A EP 4034775 A1 EP4034775 A1 EP 4034775A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft
- depressions
- sliding bearing
- shaped
- transmission
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
- F16C33/02—Parts of sliding-contact bearings
- F16C33/04—Brasses; Bushes; Linings
- F16C33/06—Sliding surface mainly made of metal
- F16C33/14—Special methods of manufacture; Running-in
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/04—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for treating only selected parts of a surface, e.g. for carving stone or glass
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/02—Sliding-contact bearings for exclusively rotary movement for radial load only
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C17/00—Sliding-contact bearings for exclusively rotary movement
- F16C17/10—Sliding-contact bearings for exclusively rotary movement for both radial and axial load
- F16C17/102—Sliding-contact bearings for exclusively rotary movement for both radial and axial load with grooves in the bearing surface to generate hydrodynamic pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24C—ABRASIVE OR RELATED BLASTING WITH PARTICULATE MATERIAL
- B24C1/00—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods
- B24C1/10—Methods for use of abrasive blasting for producing particular effects; Use of auxiliary equipment in connection with such methods for compacting surfaces, e.g. shot-peening
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2223/00—Surface treatments; Hardening; Coating
- F16C2223/02—Mechanical treatment, e.g. finishing
- F16C2223/08—Mechanical treatment, e.g. finishing shot-peening, blasting
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
- F16C2360/00—Engines or pumps
- F16C2360/31—Wind motors
-
- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Definitions
- the invention relates to a shaft sliding bearing, in particular a shaft of a wind power plant gearbox, with at least one sliding surface which has a surface roughness. Furthermore, the invention relates to a method for producing such a shaft plain bearing. In addition, the invention relates to a transmission with at least one such shaft plain bearing, a drive train with such a transmission, a wind power plant with such a drive train and an industrial application with such a transmission.
- the speeds in a wind turbine gearbox depend on the high speed and are in the range between six and 20 revolutions per minute.
- the generator speed is in the range between 900 and 2000 revolutions per minute, so that the gearbox has a key function and a good efficiency of e.g. 98% (avoidance of high cooling costs) is essential for market success. Accordingly, every supposedly small improvement in the plain bearing technology, which plays a decisive role for the transmission, and therefore with the efficiency, is a significant step.
- Shaft plain bearings are heavily used in gearboxes for wind turbines.
- An undesirable mixed friction operation cannot be ruled out, especially in the case of dynamic peak loads or with single blade assembly.
- very high contact pressures occur at very low Gleitgeschwindig speeds.
- micro-hydrodynamics within the surface roughness of the sliding surfaces of the shaft sliding bearings can contribute to lubrication.
- this micro-hydrodynamics is severely restricted, since the surface roughness of the shaft plain bearing sliding surfaces is smoothed during the running-in of a shaft plain bearing, which is why both For example, in the subsequent single sheet assembly, the micro-hydrodynamics are negligible.
- DE 102014 208419 A relates to a running surface of a cam of a valve camshaft known.
- EP 1207 314 A2 relates to a translational plain bearing in an internal combustion engine between the piston and the cylinder.
- DE 4316 012 A1 relates to a method for Feinbearbei processing of workpiece surfaces, in particular for the bores in the cylinder of an internal combustion engine.
- EP 2341 248 A2 relates to a roller bearing, individual rollers of the roller bearing being provided with a surface structure.
- the present invention creates a shaft sliding bearing of the type mentioned, in which the sliding surface is provided with a structure formed from depressions, the depth of the depressions being greater than that Surface roughness and less than 80mpi and in particular in the range between 20-50mpi.
- the structure formed from Ver promotes the micro-hydrodynamics of the corresponding sliding surface, since the smoothing effect described above is compensated by the depressions, whose depth is greater than the surface roughness of the sliding surface, which is why it is not or only are slightly smoothed and are therefore still present after running in.
- the depressions are preferably arranged evenly distributed on the sliding surface in order to give the entire sliding surface the most uniform possible micro-hydrodynamics.
- depressions can be designed in the form of grooves, with grooves in the form of grooves advantageously extending transversely to the sliding direction, which has a particularly good effect.
- depressions can be designed in the shape of a bowl and / or trough.
- bowl-shaped and / or trough-shaped depressions essentially have the shape of a cuboid, for example with dimensions of 20 ⁇ 20 ⁇ 20 ⁇ m to 50 ⁇ 50 ⁇ 50 ⁇ m.
- Essentially in this context means that the corners of the cuboid shape can be rounded.
- the side surfaces can also be inclined.
- the alignment of cup-shaped and / or trough-shaped recesses is non-uniform.
- Cup-shaped and / or trough-shaped recesses with inconsistent alignment can be produced easily and inexpensively, for example by means of shot peening, so that expensive roller burnishing tools with embossing dies are not required.
- the bowl-shaped and / or trough-shaped depressions preferably have an outer circumference in the range of 70-300 ⁇ m. Such dimensions have proven to be very effective.
- the depressions advantageously have an area proportion of 3-50% of the total sliding surface, in particular an area proportion of 30-50%. With such a surface area, effective micro-hydrodynamics are guaranteed.
- the present invention also provides a method for producing a shaft sliding bearing according to the invention, in which the depressions are produced by means of roller embossing, laser machining, sandblasting, shot blasting and / or eroding. With this manufacturing process, the depressions can be made in the at least one sliding surface of a shaft plain bearing with little effort and at low cost.
- the present invention creates a transmission with at least one shaft sliding bearing according to the invention, in particular in the form of a planetary gear, in which, for example, the planetary gears are mounted on their associated planetary gear axis and / or on the associated planet carrier using inventive shafts.
- the present invention proposes a drive train, comprising a rotor shaft which is connected to transmit torque to a transmission, which in turn is connected to a generator to transmit torque, the transmission being designed according to the invention.
- the present invention creates a wind power plant, comprising a rotor which is attached to a nacelle, a drive train being arranged on the nacelle, which is connected to the rotor in a torque-transmitting manner, the drive train being designed according to the invention. Since in particular a rotating shaft of the drive train is mounted with the at least one shaft plain bearing. Furthermore, the present invention creates an industrial application comprising a drive means which is connected to a transmission in a torque-transmitting manner, which is coupled to a mechanical application in a torque-transmitting manner, the transmission being designed according to the invention.
- FIG. 1 shows a schematic perspective view of a radial sliding bearing or radial sliding bearing acting in a radial manner according to an embodiment of the present inven tion;
- FIG 2 shows an enlarged sectional view of a recess which is formed on the sliding surface of the Wel lengleitlagers shown in FIG 1;
- FIG. 3 shows a schematic side view of an axially acting shaft sliding bearing or axial sliding bearing according to an embodiment of the present invention
- FIG. 4 shows an enlarged sectional view of a recess which is formed on the sliding surface of the Wel lengleitlagers shown in FIG. 3;
- FIG. 5 shows a sectional view of a partial area of an embodiment of a transmission according to the invention
- FIG. 6 shows a schematic sectional view of an embodiment of a wind power plant according to the invention.
- FIG. 7 shows a schematic representation of an embodiment of a drive train according to the invention and 8 shows a schematic representation of an embodiment of an industrial application according to the invention.
- the shaft plain bearing 1 comprises a sleeve 2 which is made from a shaft plain bearing material and in the present case defines a sliding surface 3 on its outside.
- the sliding surface 3 has a predetermined surface roughness, which in the present case is 10pm.
- the inside of the sleeve 2 serves as a mounting surface for non-positive, positive, or cohesive fastening of the sleeve 2 to a component, such as a planetary gear axle of a transmission, as will be explained in more detail below with reference to FIG.
- the sliding surface 3 can alternatively also be provided on the inside and the mounting surface on the outside of the sleeve 2.
- two lubricant collecting recesses 4 are formed on the sliding surface 3, which, in the assembled state of the shaft plain bearing 1, are connected to a lubricant supply system via a bore 5. Furthermore, a lubricant supply groove 6 extends between the two lubricant collecting recesses 4, which, in the assembled state of the shaft sliding bearing 1, is also connected via a bore 5 to a lubricant supply system.
- the sliding surface 3 is also provided with a structure which in the present case is formed by a large number of depressions 7. The depth t of the respective depressions 7, starting from the outside of the sliding surface 3, is greater than the surface roughness of the sliding surface 3 and less than 80 ⁇ m.
- the depressions 7 have an essentially cuboid shape with dimensions of 40 ⁇ 40 ⁇ 40 ⁇ m. 2 shows a cross-sectional view of such a recess 7. It should however be clear that other shapes and dimensions can be selected, such as cup-shaped recesses 7 with two for example circular cross-section, groove-shaped recesses 7 or the like. However, the depth t should not exceed 80 pm.
- the proportion of the area of the depressions 7 in the total sliding surface 3 is preferably between 3-50%, in the present case 40%.
- the shaft sliding bearing 1 comprises an annular disk 8 which is made of a shaft sliding bearing material and a sliding surface 3 is defined on one side.
- the sliding surface 3 has a predetermined surface roughness, which in the present case is likewise 10pm.
- the opposite side GE forms a mounting surface for non-positive, positive or cohesive fastening of the annular disk 8 to a component, such as, for example, on the inside of a planet carrier cheek of a transmission, as will be explained in more detail below with reference to FIG.
- a plurality of lubricant collecting grooves 4 which extend in a star shape in the radial direction and which are open at the radially inward end in the present case are provided on the sliding surface 3. At the radially outward end, the lubricant collecting grooves 4 are continued by narrower dirt grooves 9 which are led to the outer edge of the annular disk 8.
- the sliding surface 3 is provided with a structure analogous to the first embodiment, which is formed in the present case by a large number of recesses 7.
- the depth t of the respective recesses 7, starting from the outside of the sliding surface 3, is greater than the surface roughness of the sliding surface 3 and less than 80 ⁇ m.
- the United depressions 7 are groove-shaped and have an egg-shaped cross section.
- the width b and depth h are each 50 pm.
- a cross-sectional view of a depression 7 is shown in FIG. 4. However, it should be clear that here too other shapes and dimensions can be selected for the depressions 7. However, the depth t should not exceed 80pm.
- the proportion of the area of the depressions 7 in the total th sliding surface 3 is preferably between 3-50%, in the present case 30%.
- a significant advantage of the shaft plain bearings 1 shown in FIGS. 1 and 3 is that the structure formed from depressions 7, which is provided in addition to the surface roughness of the sliding surface 3, clearly promotes the micro-hydrodynamics of the corresponding sliding surface 3, since a Entry of the corresponding Wellengleitla gers 1 occurring, the surface roughness of the sliding surface 3 minimizing smoothing effect is compensated by the depressions 7 kom whose depth t is greater than the surface roughness of the sliding surface 3, which is why they are not or only slightly smoothed, thus also after Running-in are still present and contribute to micro-hydrodynamics.
- the depressions 7 of the shaft plain bearings 1 shown in Figures 1 and 3 are preferably manufactured by means of roller stamping, laser machining, sandblasting, shot peening and / or eroding, which is why the shaft plain bearings 1 can be manufactured easily and inexpensively.
- FIG. 5 shows a partial area of a transmission 10 according to an embodiment of the present invention, which is a planetary transmission. More precisely, FIG. 5 shows a planet gear 12 rotatably mounted on a planet carrier 11 with an associated planet gear axis. 13. The radial mounting of the planetary gear 12 takes place using a shaft sliding bearing 1 shown in FIG. 1, which is fastened with its inside of the sleeve 2 to the planetary gear axle 13. For the axial bearing, two shafts slide bearings 1 shown in FIG. 3 are used, which are fixed to the planet carrier 11.
- FIG. 1 An embodiment of a wind power plant 14 according to the invention is shown in FIG.
- the wind turbine 14 includes a rotor 15 which can be set in rotation by the wind is.
- the rotor 15 is connected via a rotor shaft 16 to a transmission 10 according to the invention in a torque-transmitting manner.
- the transmission 10 in turn is connected to a generator 17 in a torque-transmitting manner.
- the rotor shaft 16, the transmission 10 and the generator 17 belong to a drive train 18, which is accommodated in a nacelle 19 of the wind turbine 14.
- the generator 17 has two, three, or four pairs of pools.
- FIG. 7 shows a schematic structure of an embodiment of a drive train 18 according to the invention, which can be used in a wind power plant 14 (not shown in detail) or in an industrial application 20 (not shown in detail).
- the drive train 18 comprises a transmission 10 according to the invention, which is connected on the input side to a drive means 21 or a rotor 15 of the wind turbine 14 and to which drive power is thus supplied. In a wind power plant 14, this is done by means of a rotor shaft 16.
- the transmission 10 in this case comprises planetary stages 22, 23 and 24 and a spur gear stage 25, which are arranged one behind the other.
- the gear stages 22, 23, 24 and 25 output an output to a generator 17 or a mechanical application 26.
- FIG. 8 schematically shows the structure of an embodiment of an industrial application 20 according to the invention, which has a drive means 21.
- the drive means 21 is designed to provide a drive power that is transported to a transmission 10 according to the invention through a torque-transmitting connection.
- the transmission 10 is in turn connected in a torque-transmitting manner to a mechanical application 26 in order to transport an output power to the mechanical application 26.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Sliding-Contact Bearings (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP19200173.3A EP3798456A1 (de) | 2019-09-27 | 2019-09-27 | Gleitlager |
| PCT/EP2020/074739 WO2021058262A1 (de) | 2019-09-27 | 2020-09-04 | Wellengleitlager |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4034775A1 true EP4034775A1 (de) | 2022-08-03 |
Family
ID=68084645
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19200173.3A Withdrawn EP3798456A1 (de) | 2019-09-27 | 2019-09-27 | Gleitlager |
| EP20771495.7A Ceased EP4034775A1 (de) | 2019-09-27 | 2020-09-04 | Wellengleitlager |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19200173.3A Withdrawn EP3798456A1 (de) | 2019-09-27 | 2019-09-27 | Gleitlager |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20220290719A1 (de) |
| EP (2) | EP3798456A1 (de) |
| CN (1) | CN114270061B (de) |
| WO (1) | WO2021058262A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102022116804A1 (de) | 2022-07-06 | 2024-01-11 | Rolls-Royce Deutschland Ltd & Co Kg | Planetengetriebe |
| JP2025149140A (ja) | 2024-03-26 | 2025-10-08 | 大同メタル工業株式会社 | 遊星歯車ユニットおよび遊星歯車装置 |
| JP2025149139A (ja) | 2024-03-26 | 2025-10-08 | 大同メタル工業株式会社 | 軸部材、遊星歯車ユニットおよび遊星歯車装置 |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4316012A1 (de) * | 1993-05-13 | 1994-11-17 | Gehring Gmbh & Co Maschf | Verfahren zur Feinbearbeitung von Werkstück-Oberflächen |
| DE102014208419A1 (de) * | 2014-05-06 | 2015-11-12 | Schaeffler Technologies AG & Co. KG | Verfahren zum Strukturieren mindestens einer Gleitfläche eines Maschinenelements |
| EP3091242A1 (de) * | 2015-05-08 | 2016-11-09 | Siemens Aktiengesellschaft | Gleitlager mit schmiernut |
Family Cites Families (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0661470A3 (de) * | 1993-12-27 | 1996-08-14 | Starlite Ind | Gleitlager und Gegenstücke. |
| EP0877866B2 (de) * | 1996-01-30 | 2004-09-01 | Federal-Mogul Wiesbaden GmbH & Co.KG | Gleitlagerelement mit schmieröltaschen |
| JPH102335A (ja) * | 1996-06-19 | 1998-01-06 | Ntn Corp | 軸受装置 |
| US6108909A (en) * | 1996-07-02 | 2000-08-29 | Sae Magnetics (H.K.) Ltd. | Groove forming processes for shaft outer diameter |
| US6739238B2 (en) * | 2000-11-20 | 2004-05-25 | Nissan Motor Co., Ltd. | Sliding structure for a reciprocating internal combustion engine and a reciprocating internal combustion engine using the sliding structure |
| AT412877B (de) | 2003-07-01 | 2005-08-25 | Miba Gleitlager Gmbh | Schichtwerkstoff |
| US20090139799A1 (en) * | 2007-11-30 | 2009-06-04 | General Electric Company | Textured surfaces for gears |
| JP5345048B2 (ja) * | 2009-12-15 | 2013-11-20 | 三菱重工業株式会社 | 風力発電設備用変速機および風力発電装置 |
| US8123413B2 (en) * | 2009-12-30 | 2012-02-28 | General Electric Company | Surface textured rollers |
| ES2393850T3 (es) * | 2010-04-30 | 2012-12-28 | Winergy Ag | Engranaje planetario (epicicloidal) para un aerogenerador |
| AT513743B1 (de) * | 2013-01-30 | 2014-07-15 | Miba Gleitlager Gmbh | Windkraftanlagengetriebe |
| DE102013109043A1 (de) * | 2013-03-25 | 2014-09-25 | Mag Ias Gmbh | Gleitfläche |
| GB2565545B (en) * | 2017-08-14 | 2019-10-02 | Ford Global Tech Llc | A bearing assembly |
-
2019
- 2019-09-27 EP EP19200173.3A patent/EP3798456A1/de not_active Withdrawn
-
2020
- 2020-09-04 CN CN202080057603.9A patent/CN114270061B/zh active Active
- 2020-09-04 US US17/635,973 patent/US20220290719A1/en not_active Abandoned
- 2020-09-04 EP EP20771495.7A patent/EP4034775A1/de not_active Ceased
- 2020-09-04 WO PCT/EP2020/074739 patent/WO2021058262A1/de not_active Ceased
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4316012A1 (de) * | 1993-05-13 | 1994-11-17 | Gehring Gmbh & Co Maschf | Verfahren zur Feinbearbeitung von Werkstück-Oberflächen |
| DE102014208419A1 (de) * | 2014-05-06 | 2015-11-12 | Schaeffler Technologies AG & Co. KG | Verfahren zum Strukturieren mindestens einer Gleitfläche eines Maschinenelements |
| EP3091242A1 (de) * | 2015-05-08 | 2016-11-09 | Siemens Aktiengesellschaft | Gleitlager mit schmiernut |
Non-Patent Citations (2)
| Title |
|---|
| RAUHEITSKLASSEN UMWANDLUNGSTABELLE: "Umwandlungstabelle Rauheitsklassen", 1 November 2020 (2020-11-01), XP093065033, Retrieved from the Internet <URL:https://www.gebrax.de/fileadmin/user_upload/Downloads/Informationen/Rautiefen_und_Rauheitsklassen.pdf> [retrieved on 20230718] * |
| See also references of WO2021058262A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2021058262A1 (de) | 2021-04-01 |
| CN114270061B (zh) | 2024-07-05 |
| US20220290719A1 (en) | 2022-09-15 |
| CN114270061A (zh) | 2022-04-01 |
| EP3798456A1 (de) | 2021-03-31 |
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