IT201700097823A1 - Complesso di tenuta a basso attrito, sistema di accoppiamento con un anello di cuscinetto e unita’ mozzo ruota equipaggiata con tale complesso di tenuta - Google Patents

Complesso di tenuta a basso attrito, sistema di accoppiamento con un anello di cuscinetto e unita’ mozzo ruota equipaggiata con tale complesso di tenuta

Info

Publication number
IT201700097823A1
IT201700097823A1 IT102017000097823A IT201700097823A IT201700097823A1 IT 201700097823 A1 IT201700097823 A1 IT 201700097823A1 IT 102017000097823 A IT102017000097823 A IT 102017000097823A IT 201700097823 A IT201700097823 A IT 201700097823A IT 201700097823 A1 IT201700097823 A1 IT 201700097823A1
Authority
IT
Italy
Prior art keywords
sealing complex
low friction
bearing ring
coupling system
wheel unit
Prior art date
Application number
IT102017000097823A
Other languages
English (en)
Inventor
Giorgio Barberis
Daniele Duch
Antonia Nastasi
Original Assignee
Skf Ab
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 Skf Ab filed Critical Skf Ab
Priority to IT102017000097823A priority Critical patent/IT201700097823A1/it
Priority to US16/031,006 priority patent/US10759219B2/en
Priority to DE102018213098.1A priority patent/DE102018213098A1/de
Priority to CN201810980962.6A priority patent/CN109424650B/zh
Publication of IT201700097823A1 publication Critical patent/IT201700097823A1/it

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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7803—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings
    • F16C33/7806—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members suited for particular types of rolling bearings for spherical roller bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0005—Hubs with ball bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/001—Hubs with roller-bearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60B—VEHICLE WHEELS; CASTORS; AXLES FOR WHEELS OR CASTORS; INCREASING WHEEL ADHESION
    • B60B27/00—Hubs
    • B60B27/0073—Hubs characterised by sealing means
    • 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
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/583—Details of specific parts of races
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7823—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of sealing lips
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/782—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region
    • F16C33/7826—Details of the sealing or parts thereof, e.g. geometry, material of the sealing region of the opposing surface cooperating with the seal, e.g. a shoulder surface of a bearing ring
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7816—Details of the sealing or parts thereof, e.g. geometry, material
    • F16C33/783—Details of the sealing or parts thereof, e.g. geometry, material of the mounting region
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • F16C33/7883—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring mounted to the inner race and of generally L-shape, the two sealing rings defining a sealing with box-shaped cross-section
    • 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
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7889—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted to an inner race and extending toward the outer race
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3248—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports
    • F16J15/3252—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports
    • F16J15/3256—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals
    • F16J15/3264—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings provided with casings or supports with rigid casings or supports comprising two casing or support elements, one attached to each surface, e.g. cartridge or cassette seals the elements being separable from each other
    • 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
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3268—Mounting of sealing rings
    • 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
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • 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
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • F16C2226/70—Positive connections with complementary interlocking parts
    • 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
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors
IT102017000097823A 2017-08-31 2017-08-31 Complesso di tenuta a basso attrito, sistema di accoppiamento con un anello di cuscinetto e unita’ mozzo ruota equipaggiata con tale complesso di tenuta IT201700097823A1 (it)

Priority Applications (4)

Application Number Priority Date Filing Date Title
IT102017000097823A IT201700097823A1 (it) 2017-08-31 2017-08-31 Complesso di tenuta a basso attrito, sistema di accoppiamento con un anello di cuscinetto e unita’ mozzo ruota equipaggiata con tale complesso di tenuta
US16/031,006 US10759219B2 (en) 2017-08-31 2018-07-10 Low-friction sealing assembly, system for engagement with a bearing ring, and wheel-hub unit equipped with such a sealing assembly
DE102018213098.1A DE102018213098A1 (de) 2017-08-31 2018-08-06 Reibarme Dichtungsanordung, System zum Eingreifen in einen Lagerring, und Rad- lagereinheit, ausgestattet mit einer solchen Dichtungseinheit
CN201810980962.6A CN109424650B (zh) 2017-08-31 2018-08-27 密封组件、与轴承圈接合的系统和配备该组件的轮毂单元

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT102017000097823A IT201700097823A1 (it) 2017-08-31 2017-08-31 Complesso di tenuta a basso attrito, sistema di accoppiamento con un anello di cuscinetto e unita’ mozzo ruota equipaggiata con tale complesso di tenuta

Publications (1)

Publication Number Publication Date
IT201700097823A1 true IT201700097823A1 (it) 2019-03-03

Family

ID=61024846

Family Applications (1)

Application Number Title Priority Date Filing Date
IT102017000097823A IT201700097823A1 (it) 2017-08-31 2017-08-31 Complesso di tenuta a basso attrito, sistema di accoppiamento con un anello di cuscinetto e unita’ mozzo ruota equipaggiata con tale complesso di tenuta

Country Status (4)

Country Link
US (1) US10759219B2 (it)
CN (1) CN109424650B (it)
DE (1) DE102018213098A1 (it)
IT (1) IT201700097823A1 (it)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT201900012744A1 (it) * 2019-07-24 2021-01-24 Skf Ab Dispositivo di tenuta per gruppo mozzo-ruota

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2878842A1 (en) * 2013-11-29 2015-06-03 Aktiebolaget SKF Coupling system of a low friction sealing assembly with a bearing ring and a hub bearing unit equipped with such a sealing assembly
DE102016209109A1 (de) * 2015-05-29 2016-12-01 Aktiebolaget Skf Wälzlager inklusive Dichtungsvorrichtung mit geringer Reibung, speziell für eine Radnabenbaugruppe

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US3363911A (en) * 1965-08-31 1968-01-16 Chicago Rawhide Mfg Co Shaft seal
US4252329A (en) * 1979-02-26 1981-02-24 Garlock Inc. Semi-unitized shaft seal
US5004248A (en) * 1983-08-25 1991-04-02 Garlock Inc. Unitized seal with unitizing joint remote from seal lip
JPS6359770U (it) * 1986-10-09 1988-04-21
US5292199A (en) * 1993-05-07 1994-03-08 Ford Motor Company Axle wheel seal and bearing arrangement for a motor vehicle
US5813675A (en) * 1995-10-31 1998-09-29 The Timken Company Multibarrier seal
ITTO20011110A1 (it) * 2001-11-28 2003-05-28 Skf Ind Spa Dispositivo per il bloccaggio di un cuscinetto in un mozzo ruota.
JP2006132684A (ja) * 2004-11-08 2006-05-25 Uchiyama Mfg Corp 軸受用シール部材
DE102006003056B4 (de) 2006-01-20 2014-05-08 Phoenix Contact Gmbh & Co. Kg Tintendrucker zum Bedrucken von Gegenständen
JP4371429B2 (ja) 2007-05-29 2009-11-25 Ｎｔｎ株式会社 車輪用軸受装置
JP2009197975A (ja) * 2008-02-25 2009-09-03 Jtekt Corp 車軸用軸受装置
WO2010013439A1 (ja) * 2008-07-30 2010-02-04 Ntn株式会社 車輪用軸受装置
WO2011037183A1 (ja) 2009-09-25 2011-03-31 Ntn株式会社 車輪用軸受装置
DE102009052311A1 (de) * 2009-11-07 2011-05-12 Schaeffler Technologies Gmbh & Co. Kg Radlagereinheit mit flanschseitigem Encoderring
DE102010034385A1 (de) * 2010-08-13 2012-02-16 Schaeffler Technologies Gmbh & Co. Kg Dichtungsanordnung für Wälzlager
DE102011088861B4 (de) * 2011-12-16 2020-09-24 Schaeffler Technologies AG & Co. KG Radlager mit Wälzkörperschutz
DE102012002339A1 (de) * 2012-02-07 2012-09-06 Daimler Ag Kraftfahrzeugachse
JP6228756B2 (ja) * 2013-06-11 2017-11-08 Ntn株式会社 車輪用軸受装置
ITTO20130548A1 (it) * 2013-07-01 2015-01-02 Skf Ab Complesso di tenuta a basso attrito per una unita¿ mozzo ruota ed unita¿ mozzo ruota equipaggiata con tale complesso di tenuta
DE102013218635B4 (de) * 2013-09-17 2015-09-24 Schaeffler Technologies AG & Co. KG Dichtungsanordnung für Radlager mit vorgespanntem Schleuderblech
JP6748400B2 (ja) * 2014-07-01 2020-09-02 内山工業株式会社 密封装置
IT201600120099A1 (it) 2016-11-28 2018-05-28 Skf Ab Sistema di accoppiamento di un complesso di tenuta a basso attrito, ed unita’ mozzo ruota equipaggiata con tale complesso di tenuta

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2878842A1 (en) * 2013-11-29 2015-06-03 Aktiebolaget SKF Coupling system of a low friction sealing assembly with a bearing ring and a hub bearing unit equipped with such a sealing assembly
DE102016209109A1 (de) * 2015-05-29 2016-12-01 Aktiebolaget Skf Wälzlager inklusive Dichtungsvorrichtung mit geringer Reibung, speziell für eine Radnabenbaugruppe

Also Published As

Publication number Publication date
DE102018213098A1 (de) 2019-04-04
CN109424650B (zh) 2022-09-06
US10759219B2 (en) 2020-09-01
US20190061421A1 (en) 2019-02-28
CN109424650A (zh) 2019-03-05

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