DE102012207951A1 - Piston of an internal combustion engine - Google Patents
Piston of an internal combustion engine Download PDFInfo
- Publication number
- DE102012207951A1 DE102012207951A1 DE102012207951A DE102012207951A DE102012207951A1 DE 102012207951 A1 DE102012207951 A1 DE 102012207951A1 DE 102012207951 A DE102012207951 A DE 102012207951A DE 102012207951 A DE102012207951 A DE 102012207951A DE 102012207951 A1 DE102012207951 A1 DE 102012207951A1
- Authority
- DE
- Germany
- Prior art keywords
- piston
- cooling oil
- connecting rod
- cooling
- guide sleeve
- 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.)
- Granted
Links
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/18—Pistons having cooling means the means being a liquid or solid coolant, e.g. sodium, in a closed chamber in piston
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
- F01P3/10—Cooling by flow of coolant through pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/06—Arrangements for cooling pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/0015—Multi-part pistons
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F3/00—Pistons
- F02F3/16—Pistons having cooling means
- F02F3/20—Pistons having cooling means the means being a fluid flowing through or along piston
- F02F3/22—Pistons having cooling means the means being a fluid flowing through or along piston the fluid being liquid
-
- 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
- F16J1/00—Pistons; Trunk pistons; Plungers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
Kolben einer Brennkraftmaschine, mit einem Kolbenoberteil (10) und einem Kolbenunterteil (11), mit einem Kolbenbolzen (12), der im Kolbenunterteil (11) gelagert ist und der Anbindung des Kolbens an eine Pleuelstange (13) der Brennkraftmaschine dient, mit einem zwischen dem Kolbenoberteil (10) und dem Kolbenunterteil (11) ausgebildeten inneren Kühlraum (15) für Kühlöl zur Kühlung des Kolbens, der über mindestens eine Überleitbohrung (17) mit einem zwischen dem Kolbenoberteil (10) und einem Kolbenunterteil (11) ausgebildeten äußeren Kühlraum (16) verbunden ist, und mit einer Kühlölführhülse (19), welche der Führung von durch eine Bohrung (18) in der Pleuelstange (13) geführtem Kühlöl dient, wobei in das Kolbenunterteil (11) mindestens eine Bohrung (21) eingebracht ist, die mit der Kühlölführhülse (19) derart zusammenwirkt, dass durch die Pleuelstange (13) und die Kühlölführhülse (19) geführtes Kühlöl unmittelbar dem äußeren Kühlraum (16) zuführbar ist.Piston of an internal combustion engine, with a piston upper part (10) and a piston lower part (11), with a piston pin (12) which is mounted in the piston lower part (11) and the connection of the piston to a connecting rod (13) of the internal combustion engine, with an intermediate inner cooling space (15) for cooling oil for cooling the piston formed by the piston upper part (10) and the piston lower part (11), which has at least one transfer bore (17) with an outer cooling space (11) between the piston upper part (10) and a piston lower part (11). 16) is connected, and with a cooling oil guide sleeve (19), which serves the guidance of through a bore (18) in the connecting rod (13) guided cooling oil, wherein in the piston lower part (11) at least one bore (21) is introduced, the with the cooling oil guide sleeve (19) cooperates such that by the connecting rod (13) and the cooling oil guide sleeve (19) guided cooling oil directly to the outer cooling chamber (16) can be fed.
Description
Die Erfindung betrifft einen Kolben einer Brennkraftmaschine nach dem Oberbegriff des Anspruchs 1.The invention relates to a piston of an internal combustion engine according to the preamble of
Aus der
Hiervon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, einen neuartigen Kolben einer Brennkraftmaschine zu schaffen. Diese Aufgabe wird durch einen Kolben nach Anspruch 1 gelöst.On this basis, the present invention has the object to provide a novel piston of an internal combustion engine. This object is achieved by a piston according to
Erfindungsgemäß in das Kolbenunterteil mindestens eine Bohrung eingebracht, die mit der Kühlölführhülse derart zusammenwirkt, dass durch die Pleuelstange und die Kühlölführhülse geführtes Kühlöl unmittelbar dem äußeren Kühlraum zuführbar ist. Vorzugsweise ist hierzu in die Kühlölführhülse mindestens eine Bohrung eingebracht, die mit jeweils einer der Bohrungen des Kolbenunterteils zusammenwirkt.According to the invention, at least one bore is introduced into the lower piston part, which cooperates with the cooling oil guide sleeve in such a way that cooling oil guided through the connecting rod and the cooling oil guide sleeve can be fed directly to the outer cooling chamber. Preferably, for this purpose, at least one bore is introduced into the cooling oil guide sleeve, which cooperates with in each case one of the bores of the piston lower part.
Mit der hier vorliegenden Erfindung wird erstmals vorgeschlagen, über die Pleuelstange und die Kühlölführhülse geführtes Kühlöl zur Kühlung des Kolbens zumindest teilweise unter Umgehung des inneren Kühlraums unmittelbar dem äußeren Kühlraum zuzuführen. Hiermit ist eine effektive Kühlung des Kolbens an thermisch hoch belasteten Bereichen des Kolbens möglich.With the present invention, it is proposed for the first time to feed cooling oil guided via the connecting rod and the cooling oil guide sleeve at least partially directly to the outer cooling space for cooling the piston, bypassing the inner cooling space. This is an effective cooling of the piston at thermally highly loaded areas of the piston possible.
Nach einer vorteilhaften Weiterbildung der Erfindung weist das Kolbenunterteil des Kolbens radial innen benachbart zur Kühlölführhülse eine radial umlaufende Nut auf, in welche die oder jede Bohrung des Kolbenunterteils mündet und welche mit der oder jeder Bohrung der Kühlölführhülse zusammenwirkt. Alternativ weist die Kühlölführhülse des Kolbens radial außen eine radial umlaufende Nut auf, in welche die oder jede Bohrung der Kühlölführhülse mündet und welche mit der oder jeder Bohrung des Kolbenunterteils zusammenwirkt.According to an advantageous embodiment of the invention, the piston lower part of the piston has radially radially adjacent to the Kühlölführhülse a radially encircling groove into which the or each hole of the piston base opens and which cooperates with the or each hole of the cooling oil supply. Alternatively, the cooling oil supply sleeve of the piston radially outwardly has a radially encircling groove, into which opens the or each bore of the cooling oil guide sleeve and which cooperates with the or each bore of the piston lower part.
Mit diesen beiden Alternativen kann sicher gestellt werden, dass dann, wenn die Kühlölführhülse des Kolbens drehbar im Kolbenunterteil gelagert ist, stets ein sicherer Transport des Kühlöls ausgehend von der Pleuelstange über die Kühlölführhülse direkt in Richtung auf den äußeren Kühlraum gewährleistet ist.With these two alternatives it can be ensured that, when the cooling oil guide sleeve of the piston is rotatably mounted in the piston lower part, always a safe transport of the cooling oil is ensured starting from the connecting rod via the cooling oil supply directly in the direction of the outer cooling chamber.
Nach einer vorteilhaften Weiterbildung der Erfindung ist eine erste Teilmenge des durch die Pleuelstange geführten Kühlöls über die Kühlölführhülse unmittelbar dem äußeren Kühlraum zuführbar ist, wobei eine zweite Teilmenge des durch die Pleuelstange geführten Kühlöl über die Kühlölführhülse unmittelbar dem inneren Kühlraum zuführbar ist. Hierzu ist in die Kühlölführhülse eine weitere Bohrung eingebracht, über welche die zweite Teilmenge des Kühlöls dem inneren raum zuführbar ist. Nach dieser vorteilhaften Weiterbildung wird eine erste Teilmenge des Kühlöls direkt dem äußeren Kühlraum und eine zweite Menge des Kühlöls direkt dem inneren Kühlraum zugeführt. Hiermit kann die Effektivität der Kühlung des Kolbens an thermisch hoch belasteten Bereichen des Kolbens weiter verbessert werden.According to an advantageous development of the invention, a first subset of the cooling oil guided through the connecting rod can be fed directly to the outer cooling chamber via the cooling oil guide sleeve, wherein a second subset of the cooling oil guided through the connecting rod can be fed directly to the inner cooling chamber via the cooling oil guide sleeve. For this purpose, a further bore is introduced into the cooling oil guide, via which the second subset of the cooling oil to the inner space can be supplied. According to this advantageous development, a first subset of the cooling oil is fed directly to the outer cooling chamber and a second amount of the cooling oil directly to the inner cooling chamber. This can be further improved the effectiveness of the cooling of the piston at thermally highly loaded areas of the piston.
Bevorzugte Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen und der nachfolgenden Beschreibung. Ausführungsbeispiele der Erfindung werden, ohne hierauf beschränkt zu sein, an Hand der Zeichnung näher erläutert. Dabei zeigt:Preferred embodiments of the invention will become apparent from the dependent claims and the description below. Embodiments of the invention will be described, without being limited thereto, with reference to the drawings. Showing:
Die hier vorliegende Erfindung betrifft einen ölgekühlten Kolben einer Brennkraftmaschine, insbesondere einer als Dieselmotor oder Gasmotor oder Diesel-Gas-Motor ausgeführten Brennkraftmaschine, wie zum Beispiel einer Schiffsdieselbrennkraftmaschine. Ein solcher Kolben wird auch als Tauchkolben bezeichnet.The present invention relates to an oil-cooled piston of an internal combustion engine, in particular designed as a diesel engine or gas engine or diesel-gas engine engine, such as a marine diesel engine. Such a piston is also referred to as a plunger.
In einer Bohrung des Kolbenunterteils
Zwischen dem Kolbenoberteil
Kühlöl, welches der Kühlung des Kolbens dient, ist dem Kolben über eine Bohrung
Im Sinne der hier vorliegenden Erfindung ist in das Kolbenunterteil
Die oder jede Bohrung
Im Ausführungsbeispiel der
In
Wie bereits ausgeführt, ist die Kühlölführhülse
Dann, wenn die Kühlölführhülse
Wie
Eine weitere Variante zeigt
In der Variante der
Den Ausführungsbeispielen der
Demgegenüber zeigen
Obwohl in
BezugszeichenlisteLIST OF REFERENCE NUMBERS
- 1010
- KolbenoberteilPiston crown
- 1111
- KolbenunterteilPiston part
- 1212
- Kolbenbolzenpiston pin
- 1313
- Pleuelstangeconnecting rod
- 1414
- Pleuelkopfsmall end
- 1515
- Kühlraumrefrigerator
- 1616
- Kühlraumrefrigerator
- 1717
- ÜberleitbohrungÜberleitbohrung
- 1818
- Bohrungdrilling
- 1919
- KühlölführhülseCooling oil grommet
- 2020
- Federelementspring element
- 2121
- Bohrungdrilling
- 2222
- Bohrungdrilling
- 2323
- Bohrungdrilling
- 2424
- Nutgroove
- 25 25
- Nutgroove
- 2626
- Bohrungdrilling
- 2727
- Spaltgap
- 2828
- Führungsflächeguide surface
ZITATE ENTHALTEN IN DER BESCHREIBUNG QUOTES INCLUDE IN THE DESCRIPTION
Diese Liste der vom Anmelder aufgeführten Dokumente wurde automatisiert erzeugt und ist ausschließlich zur besseren Information des Lesers aufgenommen. Die Liste ist nicht Bestandteil der deutschen Patent- bzw. Gebrauchsmusteranmeldung. Das DPMA übernimmt keinerlei Haftung für etwaige Fehler oder Auslassungen.This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.
Zitierte PatentliteraturCited patent literature
- DE 3518721 C2 [0002, 0002, 0002] DE 3518721 C2 [0002, 0002, 0002]
Claims (12)
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012207951.3A DE102012207951B4 (en) | 2012-05-11 | 2012-05-11 | Pistons of an internal combustion engine |
FI20135479A FI127784B (en) | 2012-05-11 | 2013-05-08 | Piston of an internal combustion engine |
KR1020130052497A KR101966450B1 (en) | 2012-05-11 | 2013-05-09 | Piston of an internal combustion engine |
JP2013099956A JP6380967B2 (en) | 2012-05-11 | 2013-05-10 | Piston of internal combustion engine |
CN2013101707477A CN103388537A (en) | 2012-05-11 | 2013-05-10 | Piston of internal combustion engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102012207951.3A DE102012207951B4 (en) | 2012-05-11 | 2012-05-11 | Pistons of an internal combustion engine |
Publications (2)
Publication Number | Publication Date |
---|---|
DE102012207951A1 true DE102012207951A1 (en) | 2013-11-14 |
DE102012207951B4 DE102012207951B4 (en) | 2022-09-22 |
Family
ID=49475553
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE102012207951.3A Active DE102012207951B4 (en) | 2012-05-11 | 2012-05-11 | Pistons of an internal combustion engine |
Country Status (5)
Country | Link |
---|---|
JP (1) | JP6380967B2 (en) |
KR (1) | KR101966450B1 (en) |
CN (1) | CN103388537A (en) |
DE (1) | DE102012207951B4 (en) |
FI (1) | FI127784B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN110700929A (en) * | 2019-11-25 | 2020-01-17 | 中船动力有限公司 | Diesel engine piston cooling lubricating oil conveying device |
US10927788B2 (en) | 2016-06-02 | 2021-02-23 | Mahle International Gmbh | Piston of an internal combustion engine |
DE102019122877A1 (en) * | 2019-08-27 | 2021-03-04 | Man Energy Solutions Se | Pistons of an internal combustion engine |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102016116984A1 (en) * | 2015-09-11 | 2017-03-16 | Ks Kolbenschmidt Gmbh | Cooling a flask with sodium-filled tubes |
CN106704022A (en) * | 2017-01-25 | 2017-05-24 | 无锡开普机械有限公司 | Cooling and lubricating structure for piston connecting rod of reciprocating piston type V-shaped engine |
KR102449590B1 (en) * | 2020-12-31 | 2022-09-30 | 주식회사 티와이엠 | A cooling device for engine of transplanting machine |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE873185C (en) * | 1948-03-22 | 1953-04-13 | Napier & Son Ltd | Pistons, especially for internal combustion engines |
DE1525228A1 (en) * | 1964-10-21 | 1969-07-31 | Ruston & Hornsby Ltd | warehouse |
DE2751306A1 (en) * | 1976-11-18 | 1978-05-24 | Nat Res Dev | PISTON-CYLINDER ASSEMBLY FOR COMBUSTION MACHINERY |
DE3518721A1 (en) * | 1985-05-24 | 1986-11-27 | M.A.N.- B & W Diesel GmbH, 8900 Augsburg | Oil-cooled, multipart trunk piston of an internal combustion engine |
Family Cites Families (18)
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US1763625A (en) * | 1927-04-21 | 1930-06-10 | Gen Electric Co Ltd | Piston for internal-combustion engines |
US2534573A (en) * | 1948-03-22 | 1950-12-19 | Napier & Son Ltd | Piston |
BE501587A (en) * | 1950-02-28 | |||
US2788774A (en) * | 1953-11-09 | 1957-04-16 | Napier & Son Ltd | Fluid cooling of reciprocating pistons |
DE1058787B (en) * | 1954-03-15 | 1959-06-04 | Ottensener Eisenwerk Ag | Cooled immersion working piston for internal combustion engines |
US3215130A (en) * | 1963-08-30 | 1965-11-02 | Mahle Kg | Multipart oil cooled internal combustion engine piston |
GB1076805A (en) * | 1964-10-21 | 1967-07-26 | Ruston And Hornsby Ltd | Lubrication of bearings |
SU1011884A1 (en) * | 1980-09-03 | 1983-04-15 | Волгоградский сельскохозяйственный институт | Composite piston with circulation oil cooling |
JPS5758751U (en) * | 1980-09-24 | 1982-04-07 | ||
JPS5758751A (en) * | 1980-09-27 | 1982-04-08 | Kurimoto Ltd | Glass fiber reinforced cement trough for water channel and production thereof |
DE3502644A1 (en) * | 1985-01-26 | 1986-07-31 | M.A.N.-B & W Diesel GmbH, 8900 Augsburg | OIL-COOLED, MULTI-PIECE SUBMERSIBLE PISTON FOR PISTON PISTON COMBUSTION ENGINES |
DE3702694C1 (en) | 1987-01-30 | 1988-04-21 | Mahle Gmbh | Oil-cooled piston for internal combustion engines, especially for diesel engines |
DE4018252A1 (en) * | 1990-06-07 | 1991-12-12 | Man B & W Diesel Ag | Oil cooled IC engine - has oil deflection ring to recirculate oil in internal chamber in position |
KR200166643Y1 (en) * | 1997-03-07 | 2000-01-15 | 류정열 | Piston and connecting system in an automotive engine |
DE19962325C2 (en) * | 1999-12-23 | 2003-09-25 | Man B&W Diesel A/S, Copenhagen Sv | reciprocating engine |
DE10022035A1 (en) * | 2000-05-05 | 2001-11-08 | Mahle Gmbh | Internal combustion engine with built piston; has piston with base and lower part connected by screw having device in head to transfer oil from connecting rod to cooling chamber in piston |
DE102005041409A1 (en) * | 2005-09-01 | 2007-03-08 | Mahle International Gmbh | Two-piece piston for an internal combustion engine |
DE102007050213A1 (en) * | 2007-10-20 | 2009-04-23 | Mahle International Gmbh | Piston for an internal combustion engine |
-
2012
- 2012-05-11 DE DE102012207951.3A patent/DE102012207951B4/en active Active
-
2013
- 2013-05-08 FI FI20135479A patent/FI127784B/en active IP Right Grant
- 2013-05-09 KR KR1020130052497A patent/KR101966450B1/en active IP Right Grant
- 2013-05-10 CN CN2013101707477A patent/CN103388537A/en active Pending
- 2013-05-10 JP JP2013099956A patent/JP6380967B2/en active Active
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE873185C (en) * | 1948-03-22 | 1953-04-13 | Napier & Son Ltd | Pistons, especially for internal combustion engines |
DE1525228A1 (en) * | 1964-10-21 | 1969-07-31 | Ruston & Hornsby Ltd | warehouse |
DE2751306A1 (en) * | 1976-11-18 | 1978-05-24 | Nat Res Dev | PISTON-CYLINDER ASSEMBLY FOR COMBUSTION MACHINERY |
DE3518721A1 (en) * | 1985-05-24 | 1986-11-27 | M.A.N.- B & W Diesel GmbH, 8900 Augsburg | Oil-cooled, multipart trunk piston of an internal combustion engine |
DE3518721C2 (en) | 1985-05-24 | 1990-10-18 | Man B & W Diesel Ag, 8900 Augsburg, De |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10927788B2 (en) | 2016-06-02 | 2021-02-23 | Mahle International Gmbh | Piston of an internal combustion engine |
DE102019122877A1 (en) * | 2019-08-27 | 2021-03-04 | Man Energy Solutions Se | Pistons of an internal combustion engine |
DE102019122877B4 (en) | 2019-08-27 | 2021-08-19 | Man Energy Solutions Se | Pistons of an internal combustion engine |
US11473522B2 (en) | 2019-08-27 | 2022-10-18 | Man Energy Solutions Se | Piston of an internal combustion engine |
CN110700929A (en) * | 2019-11-25 | 2020-01-17 | 中船动力有限公司 | Diesel engine piston cooling lubricating oil conveying device |
Also Published As
Publication number | Publication date |
---|---|
KR20130126509A (en) | 2013-11-20 |
CN103388537A (en) | 2013-11-13 |
KR101966450B1 (en) | 2019-04-05 |
FI20135479A (en) | 2013-11-12 |
JP2013238227A (en) | 2013-11-28 |
FI127784B (en) | 2019-02-28 |
DE102012207951B4 (en) | 2022-09-22 |
JP6380967B2 (en) | 2018-08-29 |
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