WO2018101038A1 - 転がり軸受 - Google Patents
転がり軸受 Download PDFInfo
- Publication number
- WO2018101038A1 WO2018101038A1 PCT/JP2017/041054 JP2017041054W WO2018101038A1 WO 2018101038 A1 WO2018101038 A1 WO 2018101038A1 JP 2017041054 W JP2017041054 W JP 2017041054W WO 2018101038 A1 WO2018101038 A1 WO 2018101038A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- outer ring
- hole
- pin
- rolling bearing
- inner periphery
- Prior art date
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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
- F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
- F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
- F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
- F16C35/07—Fixing them on the shaft or housing with interposition of an element
- F16C35/077—Fixing them on the shaft or housing with interposition of an element between housing and outer race 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
- F16C19/00—Bearings with rolling contact, for exclusively rotary movement
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/44—Needle bearings
- F16C19/46—Needle bearings with one row or needles
-
- 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
- F16C19/22—Bearings with rolling contact, for exclusively rotary movement with bearing rollers essentially of the same size in one or more circular rows, e.g. needle bearings
- F16C19/44—Needle bearings
- F16C19/46—Needle bearings with one row or needles
- F16C19/466—Needle bearings with one row or needles comprising needle rollers and an outer ring, i.e. subunit without inner 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
- F16C33/30—Parts of ball or roller bearings
- F16C33/58—Raceways; Race 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
- 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
- F16C33/586—Details of specific parts of races outside the space between the races, e.g. end faces or bore of inner 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
- F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
- F16C2226/10—Force connections, e.g. clamping
- F16C2226/12—Force connections, e.g. clamping by press-fit, e.g. plug-in
-
- 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
- F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
- F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
- F16C2240/70—Diameters; Radii
-
- 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
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/02—Crankshaft bearings
Definitions
- the present invention relates to a rolling bearing in which an outer ring is prevented from rotating with respect to a housing.
- crankshaft that is rotatably supported by a rolling bearing is incorporated.
- This rolling bearing is used in a high temperature environment in a state of being fitted to a housing integrated with a crankcase.
- a relative gap in the circumferential direction (hereinafter referred to as “creep”) may occur between the rolling bearing and the fitting hole of the housing.
- the rolling bearing described in Patent Document 1 has an outer ring hole that is recessed in the radial direction on the outer periphery of the outer ring, and a cylindrical pin that is press-fitted and fixed in the outer ring hole.
- the pin is recessed in the radial direction on the inner periphery of the housing and press-fitted into a housing hole formed continuously with the outer ring hole and an outer ring hole of the outer ring, whereby the outer ring and the housing of the rolling bearing fitted into the housing Prevents creep during
- the pin may compress the air inside the outer ring hole and increase the inner pressure of the outer ring hole, and the bottom part of the outer ring hole may fall out and damage the outer ring. There was a problem.
- an object of the present invention is to provide a rolling bearing capable of preventing damage to the outer ring.
- the present invention provides an outer ring fitted in a housing, a plurality of rolling elements arranged to roll along the raceway surface of the outer ring, and the rolling elements in the circumferential direction.
- a cage that is held at an interval; and a pin that is fixed to the outer ring.
- the outer ring has an outer ring hole that communicates an inner periphery and an outer periphery thereof, and the pin is fitted into the outer ring hole by an interference fit.
- a structure that is fixed and engages with the housing in a state of protruding from the outer periphery of the outer ring can be employed.
- the outer ring hole communicates the inner and outer circumferences of the outer ring, fluid such as air and oil is not compressed inside the outer ring hole when the pin is tightly fitted.
- the outer ring hole is located on the radially outer side of the outer ring, and a fitting hole part into which the pin is fitted, a communication hole part communicating with the fitting hole part, and an inner periphery of the fitting hole part It is possible to employ a configuration in which a step portion is formed between the inner periphery of the communication hole portion and the pin is supported by the step portion.
- the stepped portion has a tapered shape that is inclined inward in the radial direction of the outer ring from the inner periphery of the fitting hole portion toward the inner periphery of the communication hole portion. it can.
- the stress applied to the boundary portion between the inner periphery of the fitting hole and the stepped portion is relieved by the pin that is tightly fitted in the outer ring hole.
- the communication hole portion of the outer ring hole may be configured to open to the raceway surface of the outer ring. According to this configuration, since the outer ring has a thickness on both sides in the axial direction with respect to the outer ring hole, the outer ring is prevented from cracking due to the stress applied around the outer ring hole when the pin is tightly fitted.
- the rolling element is a needle roller
- the communication hole has a circular cross section
- the hole diameter of the communication hole is smaller than 1 ⁇ 2 of the outer diameter of the needle roller. Can be adopted.
- the hole diameter of the communication hole smaller than 1/2 of the outer diameter of the needle roller, the contact surface pressure between the raceway surface of the outer ring and the needle roller is lowered during the operation of the rolling bearing, thereby rolling the roller.
- the life reduction of the bearing can be improved.
- the outer ring hole communicates the inner periphery and the outer periphery of the outer ring, when the pin is tightly fitted, fluid such as air or oil is not compressed in the outer ring hole, and the inner pressure of the outer ring hole is increased. Does not damage the outer ring.
- a longitudinal sectional view showing a rolling bearing according to the present invention Longitudinal sectional view showing the main parts of the same rolling bearing Sectional drawing which shows fitting with a rolling bearing same as the above and a housing Outline drawing showing the main part of the fitting between the rolling bearing and the housing
- the rolling bearing 20 rotatably supports a crankshaft (not shown) incorporated in a crankcase (not shown) and is fitted in a housing 30 integrated with the crankcase.
- the rolling bearing 20 of this embodiment is fitted in a housing 30, and is arranged so as to be able to roll along the outer race 1 having the raceway surface 2 on the inner peripheral surface and the raceway surface 2 of the outer race 1.
- a pin 6 fixed by the.
- the outer ring 1 has a thin wall thickness of 3.5 mm to 5.0 mm.
- the wall thickness of the outer ring 1 is preferably set to at least 3.5 mm or more.
- the thickness of the outer ring 1 is preferably set to 3.5 mm or more and 1/10 or less of the outer diameter.
- the outer diameter is less than 40 mm, it is preferably set between 3.5 mm and 5.0 mm.
- the housing 30 is composed of divided housings 32 and 33 that are divided into two with a position including the outer ring hole 5 of the outer ring 1 as a split surface 31 in the circumferential direction of the rolling bearing 20.
- the housing 30 has a fitting recess 34 and a pin hole 35 formed across the divided housings 32 and 33.
- the outer ring 1 of the rolling bearing 20 is fitted in the fitting recess 34, and the pin 6 fixed to the outer ring hole 5 by the interference fit is engaged with the pin hole 35.
- the material of the housing 30 can be the same material as the crankcase, for example, an aluminum alloy.
- the outer ring 1 has flanges 7 and 7 at both ends in the axial direction of the raceway surface 2, and an outer ring hole 5 that is recessed radially inward is formed in the outer peripheral part of the outer ring 1. Yes.
- relief grooves 2 a are formed on both axial sides of the raceway surface 2.
- the outer ring 1 is preferably, for example, a solid shape obtained by turning a steel pipe or the like, and may be a press-formed product obtained by pressing a steel plate.
- the outer ring hole 5 is formed in the middle portion of the outer ring 1 in the axial direction, and communicates the inner circumference and the outer circumference of the outer ring 1. As shown in FIG. 2, the outer ring hole 5 includes a fitting hole portion 8 positioned on the radially outer side of the outer ring 1 and a communication hole portion 9 positioned on the radially inner side of the outer ring 1 and communicating with the fitting hole portion 8. And have.
- the fitting hole 8 has a circular cross section whose inner peripheral surface is a cylindrical surface, and an opening 8a formed on the outer periphery of the outer ring 1 is a taper whose hole diameter increases toward the radially outer side of the outer ring 1. It has a shape.
- the fitting hole 8 has a hole diameter d1 slightly smaller than the outer diameter d2 of the pin 6, and the pin 6 is fixed by an interference fit.
- the shape of the fitting hole 8 is not limited to a circular cross section, and may be a shape corresponding to the cross sectional shape of the pin 6.
- the fitting hole 8 may have a cross-sectional shape in which the pin 6 is tightly fitted in a state where the entire circumference of the outer peripheral surface of the pin 6 is in contact with the entire circumference of the inner peripheral surface.
- the communication hole 9 has a circular cross section with an inner peripheral surface being a cylindrical surface, and is open to the raceway surface 2 of the outer ring 1.
- the communication hole portion 9 has a center axis that coincides with the center axis of the fitting hole portion 8, and has a hole diameter dimension d 3 that is smaller than the hole diameter dimension d 1 of the fitting hole portion 8.
- the communication hole 9 is not limited to a circular shape as long as it communicates with the fitting hole 8 and opens to the raceway surface 2 of the outer ring 1.
- the hole diameter d3 of the communicating hole 9 is set to be smaller than 1/2 of the outer diameter d4 of the needle roller 3.
- a step portion 10 is formed between the inner periphery of the fitting hole portion 8 of the outer ring hole 5 and the inner periphery of the communication hole portion 9.
- the step portion 10 has a taper shape that is inclined inward in the radial direction of the outer ring 1 from the inner periphery of the fitting hole portion 8 toward the inner periphery of the communication hole portion 9.
- the end portion of the pin 6 that is tightly fitted in the outer ring hole 5 abuts and supports the pin 6.
- the stepped portion 10 does not necessarily need to be tapered as long as the pin 6 can be supported. However, if the stepped portion 10 is tapered, the inner periphery of the fitting hole portion 8 is secured by the pin 6 that is tightly fitted to the outer ring hole 5. The stress applied to the boundary portion between the step portion 10 and the step portion 10 is alleviated.
- the outer ring hole 5 can be, for example, a cylindrical surface on the inner peripheral surface without forming the stepped portion 10 if the pin 6 is fixed by an interference fit. If the outer ring hole 5 has the step part 10 as in this embodiment, the pin 6 is supported by the step part 10, and the protrusion of the pin 6 from the raceway surface 2 of the outer ring 1 is prevented.
- the cage 4 includes a pair of annular rim portions 11 provided at intervals in the axial direction, and a plurality of column portions 12 disposed between the pair of rim portions 11 and 11 at intervals in the circumferential direction. And pockets 13 are formed between the column portions 12 and 12 adjacent to each other in the circumferential direction.
- the cage 4 is guided by the outer ring with the outer peripheral surfaces of the pair of rim portions 11, 11 facing the inner peripheral surfaces of the pair of flange portions 7, 7.
- the inner surface in the radial direction of the column part 12 is located radially inward from the pitch circle diameter (PCD) of the needle rollers 3 (see the one-dot chain line in FIG. 4).
- the cage 4 is an injection molded product of synthetic resin or a press molded product by pressing a steel plate.
- the needle rollers 3 are press-fitted into the pockets 13, and the needle rollers 3 are held in the pockets 13.
- the pin 6 is a metal cylinder, and has chamfered portions 6a around the entire periphery of both ends thereof.
- the pin 6 has a length projecting from the outer peripheral surface of the outer ring 1 in a state in which the pin 6 is fitted in the outer ring hole 5 of the outer ring 1 and supported by the step portion 10.
- the pin 6 is engaged with the housing 30 in a state of being fitted in the pin hole 35 of the housing 30. By this engagement, creep between the rolling bearing 20 and the housing 30 is prevented.
- the rolling bearing 20 of this embodiment is configured as described above, and the outer ring hole 5 formed in the outer ring 1 communicates the outer periphery and the inner periphery of the outer ring 1. For this reason, when the pin 6 is tightly fitted into the outer ring hole 5, fluid such as air or oil is not compressed inside the outer ring hole 5. Therefore, unlike the conventional rolling bearing, the inner pressure of the outer ring hole is increased, and the bottom part of the outer ring hole is not removed and the outer ring is not damaged.
- the outer ring hole 5 has a stepped portion 10, and the fitting side end of the pin 6 is supported by the stepped portion 10, so that the pin 6 tightly fitted into the fitting hole 8 is the raceway surface of the outer ring 1. Protruding from 2 is prevented.
- the outer ring hole 5 is formed at an intermediate portion in the axial direction of the outer ring 1, and the communication hole portion 9 opens in the raceway surface 2 of the outer ring 1.
- the step portion 10 of the outer ring hole 5 has a tapered shape that is inclined inward in the radial direction of the outer ring 1 from the inner periphery of the fitting hole portion 8 toward the inner periphery of the communication hole portion 9. Accordingly, the stress applied to the boundary portion between the inner periphery of the fitting hole portion 8 and the stepped portion 10 is relieved by the pin 6 that is tightly fitted in the outer ring hole 5.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Mounting Of Bearings Or Others (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
Description
2 軌道面
2a 逃げ溝
3 針状ころ
4 保持器
5 外輪孔
6 ピン
6a 面取り部
7 鍔部
8 嵌合孔部
8a 開口部
9 連通孔部
10 段差部
11 リム部
12 柱部
13 ポケット
20 転がり軸受
30 ハウジング
31 割り面
32、33 分割ハウジング
34 嵌合凹部
35 ピン孔
d1、d3 孔径寸法
d2、d4 外径寸法
Claims (5)
- ハウジングに嵌合される外輪と、その外輪の軌道面に沿って転動可能に配置される複数の転動体と、その転動体を周方向に間隔をおいて保持する保持器と、前記外輪に固定されるピンとを備え、
前記外輪は、その内周と外周とを連通する外輪孔を有し、前記ピンは、前記外輪孔に締まり嵌めにより固定され、前記外輪の外周から突出する状態で前記ハウジングに係合する転がり軸受。 - 前記外輪孔は、前記外輪の径方向外側に位置し、前記ピンが嵌合される嵌合孔部と、その嵌合孔部に連通する連通孔部と、前記嵌合孔部の内周と連通孔部の内周との間に形成される段差部とを有し、前記ピンが前記段差部で支持されている請求項1に記載された転がり軸受。
- 前記段差部が前記嵌合孔部の内周から前記連通孔部の内周へ向かって、前記外輪の径方向内向きに傾斜するテーパ状をなしている請求項2に記載された転がり軸受。
- 前記外輪孔の連通孔部は、前記外輪の軌道面に開口している請求項2または3に記載された転がり軸受。
- 前記転動体が針状ころであり、前記連通孔部が断面円形をなしており、その連通孔部の孔径寸法が前記針状ころの外径寸法の1/2よりも小さくなっている請求項2~4のいずれかに記載された転がり軸受。
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1907945.8A GB2571474B (en) | 2016-11-29 | 2017-11-15 | Rolling bearing |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2016-231326 | 2016-11-29 | ||
JP2016231326A JP2018087604A (ja) | 2016-11-29 | 2016-11-29 | 転がり軸受 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2018101038A1 true WO2018101038A1 (ja) | 2018-06-07 |
Family
ID=62242174
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2017/041054 WO2018101038A1 (ja) | 2016-11-29 | 2017-11-15 | 転がり軸受 |
Country Status (3)
Country | Link |
---|---|
JP (1) | JP2018087604A (ja) |
GB (1) | GB2571474B (ja) |
WO (1) | WO2018101038A1 (ja) |
Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1492819A (fr) * | 1965-12-28 | 1967-08-25 | Productions Ind Et De Distrib | Coussinet à coins d'huile auto-adaptés ou analogue et ses diverses applications |
JPS52166051U (ja) * | 1976-06-11 | 1977-12-16 | ||
JPS61101127U (ja) * | 1984-12-07 | 1986-06-27 | ||
US5288153A (en) * | 1993-01-04 | 1994-02-22 | Delaware Capital Formation, Inc. | Tilting pad journal bearing using directed lubrication |
JP2002048135A (ja) * | 2000-08-04 | 2002-02-15 | Ishikawajima Harima Heavy Ind Co Ltd | 軸受構造 |
JP2005248985A (ja) * | 2004-03-01 | 2005-09-15 | Koyo Seiko Co Ltd | 転がり軸受一体型一方向クラッチの固定構造 |
JP2007263194A (ja) * | 2006-03-28 | 2007-10-11 | Ntn Corp | 揺動軸受 |
JP2011236967A (ja) * | 2010-05-10 | 2011-11-24 | Ihi Corp | すべり軸受構造及び過給機 |
JP2014105721A (ja) * | 2012-11-26 | 2014-06-09 | Hikari Dendoki Co Ltd | テーブル装置 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001236967A (ja) * | 2000-02-25 | 2001-08-31 | Sumitomo Electric Ind Ltd | 固体高分子電解質型燃料電池用セパレータ |
-
2016
- 2016-11-29 JP JP2016231326A patent/JP2018087604A/ja active Pending
-
2017
- 2017-11-15 GB GB1907945.8A patent/GB2571474B/en active Active
- 2017-11-15 WO PCT/JP2017/041054 patent/WO2018101038A1/ja active Application Filing
Patent Citations (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1492819A (fr) * | 1965-12-28 | 1967-08-25 | Productions Ind Et De Distrib | Coussinet à coins d'huile auto-adaptés ou analogue et ses diverses applications |
JPS52166051U (ja) * | 1976-06-11 | 1977-12-16 | ||
JPS61101127U (ja) * | 1984-12-07 | 1986-06-27 | ||
US5288153A (en) * | 1993-01-04 | 1994-02-22 | Delaware Capital Formation, Inc. | Tilting pad journal bearing using directed lubrication |
JP2002048135A (ja) * | 2000-08-04 | 2002-02-15 | Ishikawajima Harima Heavy Ind Co Ltd | 軸受構造 |
JP2005248985A (ja) * | 2004-03-01 | 2005-09-15 | Koyo Seiko Co Ltd | 転がり軸受一体型一方向クラッチの固定構造 |
JP2007263194A (ja) * | 2006-03-28 | 2007-10-11 | Ntn Corp | 揺動軸受 |
JP2011236967A (ja) * | 2010-05-10 | 2011-11-24 | Ihi Corp | すべり軸受構造及び過給機 |
JP2014105721A (ja) * | 2012-11-26 | 2014-06-09 | Hikari Dendoki Co Ltd | テーブル装置 |
Also Published As
Publication number | Publication date |
---|---|
JP2018087604A (ja) | 2018-06-07 |
GB2571474A (en) | 2019-08-28 |
GB201907945D0 (en) | 2019-07-17 |
GB2571474B (en) | 2022-02-09 |
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