WO2023047875A1 - 回転電機 - Google Patents
回転電機 Download PDFInfo
- Publication number
- WO2023047875A1 WO2023047875A1 PCT/JP2022/031826 JP2022031826W WO2023047875A1 WO 2023047875 A1 WO2023047875 A1 WO 2023047875A1 JP 2022031826 W JP2022031826 W JP 2022031826W WO 2023047875 A1 WO2023047875 A1 WO 2023047875A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- oil
- rotor
- shaft
- coil
- cover
- Prior art date
Links
- 238000001816 cooling Methods 0.000 claims description 26
- 238000002347 injection Methods 0.000 claims description 15
- 239000007924 injection Substances 0.000 claims description 15
- 230000002093 peripheral effect Effects 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 9
- 239000002184 metal Substances 0.000 claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 4
- 239000007921 spray Substances 0.000 abstract 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 5
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910000576 Laminated steel Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K1/00—Details of the magnetic circuit
- H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
- H02K1/22—Rotating parts of the magnetic circuit
- H02K1/32—Rotating parts of the magnetic circuit with channels or ducts for flow of cooling medium
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K9/00—Arrangements for cooling or ventilating
- H02K9/19—Arrangements for cooling or ventilating for machines with closed casing and closed-circuit cooling using a liquid cooling medium, e.g. oil
Definitions
- the present invention relates to rotating electric machines.
- cooling oil is jetted downward to each coil end from above the axial ends of the rotating electrical machine.
- the cooling oil comes into contact with the coil end portion, it takes heat and flows along the outer periphery of the coil end portion toward the lower oil pan.
- the present invention has been made in view of the above situation, and provides a rotating electric machine capable of injecting oil to the inner circumference of the coil without supplying oil to the inside of the rotor shaft.
- a rotating electrical machine houses a rotor, a shaft that passes through the rotor along a rotation axis and is supported by a bearing, and a rotor that is internally wound with a coil. It includes a cylindrical stator, a rotor cover attached to the axial end face of the rotor, and a housing having a flow path for supplying oil to the bearing.
- the rotor cover forms a concentric gap with the shaft and has an oil receiving portion that receives oil from the bearing in the gap.
- the oil receiver has an injection port for injecting the oil guided into the gap toward the inner periphery of the coil by centrifugal force.
- the shaft may have a delivery portion that protrudes radially inside the gap and delivers oil to the oil receiving portion.
- the rotor cover may have an oil guide portion on the outer peripheral side of the oil receiving portion.
- the oil guide portion may include an inclined surface that reflects the oil injected from the injection port, and may adjust the cooling position of the coil by the oil.
- the rotor cover may be made of metal and cover the axial end surface of the rotor. The axial end face of the rotor may be cooled with oil through the oil guide portion of the rotor cover.
- the housing may further include an oil spraying section for spraying oil from above the coil, and an oil supply passage for supplying oil to the oil spraying section.
- the flow path may supply oil branched from the oil supply path.
- oil can be injected to the inner circumference of the coil without supplying oil to the rotor shaft.
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1;
- FIG. 2 is a front view of the rotating electrical machine with a load-side housing cover removed; It is a figure which shows the inner surface side of the housing cover of a load side.
- FIG. 4 is a cutaway perspective view of a rotor cover; 3 is an enlarged view of the vicinity of a bearing on the load side in FIG. 2;
- FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1;
- FIG. 2 is a front view of the rotating electrical machine with a load-side housing cover removed; It is a figure which shows the inner surface side of the housing cover of a load side.
- the XYZ coordinate system is shown as a three-dimensional orthogonal coordinate system as appropriate.
- the Z direction is parallel to the rotation axis.
- the X direction is a direction orthogonal to the Z direction and corresponds to the direction perpendicular to the paper surface of FIG.
- the Y direction is a direction orthogonal to both the X direction and the Z direction, and corresponds to the vertical direction in FIG.
- the rotating shaft of the rotating electrical machine is denoted by symbol AX as needed.
- the circumferential direction around the rotation axis AX is simply referred to as the circumferential direction
- the radial direction around the rotation axis AX is simply referred to as the radial direction.
- FIG. 1 is a perspective view showing an example of a rotating electric machine 1 of this embodiment.
- FIG. 2 is a cross-sectional view taken along line AA of FIG.
- FIG. 3 is a front view of the rotary electric machine 1 with the load-side housing cover 6 removed.
- FIG. 4 is a view showing the inner surface side of the housing cover 6 on the load side.
- the rotating electrical machine 1 of this embodiment is an inner rotor type motor, and includes a rotor 2, a shaft 3, and a stator 4.
- the rotor 2 , shaft 3 and stator 4 are housed in a housing having a housing body 5 and a housing cover 6 . Both the housing body 5 and the housing cover 6 are manufactured by casting.
- the rotor 2 is, for example, a magnet embedded type or surface magnet type rotor.
- the iron core of the rotor 2 is formed by laminating a plurality of electromagnetic steel plates or the like in the axial direction.
- a shaft 3 is fitted in the center of the rotor 2 so as to pass through the iron core along the rotation axis AX.
- End plates 11a and 11b and rotor covers 12a and 12b are attached to both axial ends of the rotor 2, respectively.
- the shaft 3 has a flange portion 3c and a first tapered region 3a at a portion exposed from the iron core of the rotor 2 to the anti-load side (right side in FIG. 2). Further, the shaft 3 has a second tapered region 3b at a portion exposed from the iron core of the rotor 2 to the load side (left side in FIG. 2).
- a flange portion 3c of the shaft 3 protrudes annularly in the radial direction of the shaft 3 and contacts the end plate 11a on the anti-load side.
- the first tapered region 3a of the shaft 3 is formed along the axial direction from the surface of the flange portion 3c on the non-load side, and has a tapered shape that decreases in diameter as it separates from the rotor 2 and tapers to the non-load side. None.
- the second tapered region 3b of the shaft 3 has a tapered shape that decreases in diameter as it separates from the rotor 2 and tapers toward the load side.
- the tapered regions 3a, 3b are an example of a delivery portion.
- the end plates 11a and 11b are ring-shaped members having a smaller diameter than the rotor 2 and having a hole through which the shaft 3 is inserted in the center.
- the end plate 11a arranged on the anti-load side is interposed between the flange portion 3c of the shaft 3 and the rotor 2, and is in close contact with the axial end face (first end face) of the rotor 2 on the anti-load side.
- the end plate 11b arranged on the load side (left side in FIG. 2) is in close contact with the axial end face (second end face) of the rotor 2 on the load side.
- the end plates 11a and 11b have the function of pressing the rotor 2 from both sides in the axial direction and holding the iron core of the rotor 2 made of laminated steel plates.
- the rotor cover 12a arranged on the opposite load side covers the end plate 11a and the first end surface of the rotor 2 from the outside, and is fixed to the rotor 2 in close contact with the first end surface.
- the rotor cover 12b arranged on the load side covers the end plate 11b and the second end face of the rotor 2 from the outside and is fixed to the rotor 2 in close contact with the second end face.
- the stator 4 has a cylindrical stator core and accommodates the rotor 2 inside with a small air gap.
- a plurality of slots (not shown) are formed in the inner circumference of the stator 4 along the axial direction, and coils are wound around the slots. Coil end portions 7 of the coil protrude from the stator 4 at both ends in the axial direction of the stator 4 and form an annular shape in the circumferential direction.
- the rotating electrical machine 1 by sequentially switching the magnetic field of the stator 4 by current control of the coil, an attractive force or a repulsive force with the magnetic field of the rotor 2 is generated. As a result, the rotor 2 and the shaft 3 are rotated, and the rotating electric machine 1 is driven. At this time, the coil heats up due to the energization. Moreover, the permanent magnets housed in the rotor 2 are also heated by electromagnetic induction.
- the housing body 5 of the rotary electric machine 1 is a housing having a cylindrical space with both sides open in the axial direction.
- the rotor 2 with the shaft 3 fitted therein and the stator 4 are arranged concentrically.
- the stator 4 is fitted to the inner periphery of the housing body 5 , and the housing body 5 is attached so as to cover the outer peripheral surface of the stator 4 .
- Housing covers 6 are attached to both sides of the housing main body 5 in the axial direction. As a result, the openings on both sides of the housing body 5 are closed with the housing covers 6 respectively.
- Each housing cover 6 is provided with a bearing 8 , and the shaft 3 is rotatably supported by the bearing 8 of the housing cover 6 . The load-side end of the shaft 3 penetrates the housing cover 6 and protrudes outward.
- the housing body 5 has an oil supply passage 13 for cooling the coil end portion 7 with oil.
- the oil supply passage 13 is an oil passage through which cooling oil passes through an oil cooler and an oil pump (both not shown), and is connected to an oil inlet 14 that receives the cooling oil.
- the oil supply passage 13 is arranged above the stator 4 in FIG.
- the oil supply passage 13 extends axially within the housing body 5 and is closed on both sides by the housing cover 6 . Further, ends of the oil supply path 13 are connected to the first flow path 15 and the second flow path 16 .
- the first flow path 15 and the second flow path 16 are formed on the load side and the anti-load side of the rotary electric machine 1, respectively, and both have substantially the same configuration.
- the first flow path 15 is a flow path branched from the oil supply path 13 and extending in the circumferential direction, and has a plurality of holes opened downward. Each hole of the first flow path 15 communicates with the internal space of the housing body 5 at a position facing the outer peripheral surface of the coil end portion 7 .
- the first flow path 15 is an example of an oil spraying portion, and has a function of spraying cooling oil from the oil supply passage 13 to the coil end portion from above.
- the second flow path 16 is a flow path that supplies oil to the bearing 8 via the housing cover 6.
- the second flow path 16 has a groove portion 17 formed in the housing cover 6 and a communication hole 18 connecting the oil supply passage 13 and the groove portion 17 .
- the groove portion 17 of the second flow path 16 is formed on the inner surface side of the housing cover 6 and extends vertically along the radial direction of the rotary electric machine 1 from the oil supply path 13 to the bearing 8 as shown in FIGS. there is 4 shows the groove portion 17 of the housing cover 6 on the load side, the groove portion 17 of the housing cover 6 on the anti-load side is configured similarly to the load side.
- a communication hole 18 of the second flow path 16 is formed in the housing cover 6 so as to be inclined downward from the end of the oil supply path 13 with respect to the axial direction, and communicates with the upper end of the groove portion 17 . As a result, part of the cooling oil from the oil supply path 13 is supplied to the bearing 8 through the communication hole 18 and the groove portion 17 of the second flow path 16 .
- the vicinity of the bottom surface of the housing body 5 functions as an oil pan in which oil heat-exchanged with the coil end portion 7 is stored.
- the housing body 5 is provided with an oil outlet 19 for sucking out the oil stored in the oil pan.
- An oil outlet 19 of the housing body 5 is connected to an oil pump.
- the rotor covers 12a and 12b of the present embodiment can spread the oil supplied to the bearing 8 toward the inner periphery of the coil end portion 7 from the shaft 3 side by centrifugal force.
- the oil spraying by the rotor covers 12a and 12b will be described below.
- the term "rotor cover 12" will also be used.
- FIG. 5 is a cutaway perspective view of the rotor cover 12.
- FIG. 6 is an enlarged view of the vicinity of the bearing on the load side in FIG. 2.
- the rotor cover 12 is a disc-shaped member made of metal, and has a cover body 21 , an oil receiving portion 22 and an oil guide portion 23 .
- a cover body 21 of the rotor cover 12 has an opening in the center through which the shaft 3 can be inserted, and is disc-shaped with dimensions corresponding to the outer diameter of the rotor 2 .
- the front surface of the cover body 21 faces the inner surface of the housing cover 6
- the rear surface of the cover body 21 faces the end plates and the axial end faces of the rotor 2 .
- the cover main body 21 covers the axial end surface of the rotor 2 to prevent the permanent magnets inserted into the rotor 2 from coming off.
- the oil receiving portion 22 is annularly formed on the outer edge of the cover body 21 on the inner peripheral side, and functions to receive oil from the bearing 8 in a gap formed between the outer peripheral surface of the shaft 3 and the oil receiving portion 22 .
- the oil receiving portion 22 protrudes from the front surface of the cover main body 21 in the axial direction of the rotary electric machine 1, and has a tapered shape in which the inner peripheral surface of the rotor cover 12 increases in diameter from the front side to the rear side.
- the oil receiver 22 is arranged concentrically with respect to the tapered area of the shaft 3 and covers the tapered area from the outside. As shown in FIGS. 2 and 6, the oil receiving portion 22 of the rotor cover 12b is arranged at a position corresponding to the second tapered region 3b of the shaft 3. As shown in FIG. Similarly, as shown in FIG. 2, the oil receiving portion 22 of the rotor cover 12a is arranged at a position corresponding to the first tapered region 3a of the shaft 3. As shown in FIG.
- the inner diameter of the oil receiver 22 is set larger than the outer diameter of the shaft 3 , and a concentric gap is formed between the shaft 3 and the oil receiver 22 . Further, the rotor cover 12 is attached to the rotor 2 so that the tip of the oil receiving portion 22 faces the bearing 8 in the axial direction.
- At least one or more oil injection ports 24 are formed in the oil receiving portion 22 so as to communicate with the oil receiving portion 22 in the radial direction.
- a plurality of oil injection ports 24 are formed in the oil receiving portion 22 at regular intervals (for example, 45 degree intervals) in the circumferential direction. Note that the number and arrangement intervals of the oil injection ports 24 in the oil receiving portion 22 can be changed as appropriate.
- the oil guide portion 23 is annularly formed on the front outer peripheral side of the cover body 21 .
- the oil guide portion 23 has a tapered inclined surface and has a function of reflecting the oil injected from the oil injection port 24 on the inclined surface and guiding the oil to the coil end portion 7 .
- FIG. 5 shows the oil guide portion 23 having a shape in which the outer peripheral side of the inclined surface rises with respect to the front surface of the cover body 21 .
- the shape of the oil guide portion 23 is not limited to the above.
- the flow of oil in the rotary electric machine 1 of this embodiment will be described below.
- the oil stored in the oil pan of the housing body 5 is sucked out from the oil outlet 19 by driving the oil pump and cooled by the oil cooler.
- the oil cooled by the oil cooler is delivered from the oil inlet 14 to the oil supply passage 13 located above the housing body 5 .
- oil supply passage 13 oil flows on one side (anti-load side) and the other side (load side) in the axial direction. Duplicate description of the oil flowing toward the is omitted.
- the oil flowing to the load side of the oil supply passage 13 branches into the first flow path 15 and the second flow path 16 at the end of the oil supply path 13 .
- the oil that has flowed into the first flow path 15 is sprayed onto the coil end portion 7 from above, and flows down the outer periphery of the coil end portion 7 from both sides in the counterclockwise and clockwise directions. At this time, the oil in contact with the coil end portion 7 absorbs heat, so that the coil end portion 7 is cooled from the outer peripheral side.
- the oil that has flowed into the second flow path 16 is guided to the bearing 8 through the communication hole 18 and the groove portion 17 as indicated by the arrows in FIG. Then, oil is supplied to the bearing 8 from between the housing cover 6 and the bearing 8 via the second flow path 16 to ensure lubrication of the bearing 8 .
- the oil supplied to the bearing 8 from between the housing cover 6 and the bearing 8 reaches the rotor 2 side through, for example, the bearing 8, and then travels along the shaft 3 to 3 and the oil receiver 22.
- centrifugal force acts on the oil that has flowed into the gap between the shaft 3 and the oil receiving portion 22 .
- the oil that has flowed into the gap between the shaft 3 and the oil receiving portion 22 is raked out radially outward by the tapered region of the shaft 3 that protrudes radially.
- the oil that has flowed into the gap moves toward the inner peripheral surface of the oil receiving portion 22 and is jetted from the oil jet port 24 by centrifugal force.
- the oil injected from the oil injection port 24 is reflected by the oil guide portion 23 of the cover body 21 and then contacts the inner circumference of the coil end portion 7 .
- the oil in contact with the coil end portion 7 absorbs heat, so that the coil end portion 7 is also cooled from the inner peripheral side.
- the oil from the oil injection port 24 is injected to the entire inner circumference of the coil end portion 7 .
- the position (cooling position) on the inner periphery of the coil end portion 7 where the oil hits can be adjusted to a desired position according to the angle of the inclined surface. be done.
- the oil since the oil is diffused by contact with the oil guide portion 23 , the oil can be brought into contact with a wider range of the inner circumference of the coil end portion 7 .
- the permanent magnets housed in the rotor 2 are thermally connected to the metal rotor cover 12 that is in close contact with the axial end face of the rotor 2 . Since the rotor cover 12 is cooled by the oil not only by contact with the oil at the oil receiving portion 22 but also by contact with the oil guide portion 23, the permanent magnets of the rotor 2 are also cooled from the axial end side. can be
- both the oil sprayed onto the coil end portion 7 from above and the oil dripping onto the inner periphery of the coil end portion 7 after being injected flow back into the oil pan and are stored. Then, the oil in the oil pan is sent out again toward the oil cooler by driving the oil pump.
- the rotor cover 12 having the oil receiver 22 is attached to the rotor 2 .
- the oil receiving portion 22 forms a concentric gap with the shaft 3 and receives oil from the bearing 8 in the gap. Further, the oil guided into the gap is jetted from the oil jetting port 24 of the oil receiver 22 toward the inner circumference of the coil by centrifugal force. As a result, in the rotary electric machine 1 of the present embodiment, the inner peripheral side of the coil can be cooled with oil.
- the oil supplied to the bearing 8 is received in the gap between the oil receiving portion 22 and the shaft 3 and is jetted from the oil jetting port 24 by centrifugal force.
- the cost of the cooling structure can be suppressed, and the rigidity of the shaft is not lowered.
- a configuration example in which a tapered region is formed in the shaft 3 as the sending portion and faces the oil receiving portion 22 of the rotor cover 12 has been described, but the configuration of the sending portion is not limited to the above.
- one or more projections may be formed in the circumferential direction of the shaft 3 to scrape up the oil from the bearing 8 and deliver it to the oil receiving portion 22 .
- the oil from the bearing 8 may be moved to the oil receiving portion 22 by centrifugal force without forming a taper or projection on the shaft 3 side.
- the configuration example in which the oil from the oil injection port 24 is reflected by the inclined surface of the oil guide portion 23 was explained, but the rotor cover 12 does not necessarily have to be provided with the oil guide portion 23 .
- a plurality of oil injection ports 24 having different inclinations in the axial direction are formed in the oil receiving portion 22 to generate a flow that reflects the oil to the oil guide portion 23 and a flow that directly injects the oil to the coil end portion 7.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Motor Or Generator Cooling System (AREA)
Abstract
Description
また、ロータカバーは金属で形成されるとともに、ロータの軸方向端面を覆ってもよい。そして、ロータの軸方向端面は、ロータカバーのオイル案内部を介してオイルで冷却されてもよい。
実施形態では説明を分かり易くするため、本発明の主要部以外の構造や要素については、簡略化または省略して説明する。また、図面において、同じ要素には同じ符号を付す。なお、図面に示す各要素の形状、寸法などは模式的に示したもので、実際の形状、寸法などを示すものではない。
回転電機1において、ハウジング本体5のオイルパンに貯留されたオイルは、オイルポンプの駆動によりオイル出口19から吸い出され、オイルクーラで冷却される。オイルクーラで冷却されたオイルは、オイル入口14からハウジング本体5の上側に位置する給油路13に送出される。給油路13においてオイルは軸方向の一方側(反負荷側)と他方側(負荷側)に流れるが、以下の説明では、給油路13の負荷側に向けて流れるオイルについて説明し、反負荷側に向けて流れるオイルに関する重複説明は省略する。
Claims (5)
- ロータと、
回転軸に沿って前記ロータを貫通し、軸受に軸支されるシャフトと、
前記ロータを内側に収容するとともに、内周側にコイルが巻回される円筒状のステータと、
前記ロータの軸方向端面に取り付けられるロータカバーと、
前記軸受にオイルを供給する流路を有する筐体と、を備え、
前記ロータカバーは、前記シャフトとの間に同心状の隙間を形成し、前記軸受からの前記オイルを前記隙間で受けるオイル受け部を有し、
前記オイル受け部は、前記隙間に導かれたオイルを前記コイルの内周に向けて遠心力で噴射する噴射口を有する
ことを特徴とする回転電機。 - 前記シャフトは、前記隙間の内側で径方向に突出し、前記オイル受け部に前記オイルを送出する送出部を有する
請求項1に記載の回転電機。 - 前記ロータカバーは、前記オイル受け部よりも外周側にオイル案内部を有し、
前記オイル案内部は、前記噴射口から噴射された前記オイルを反射する傾斜面を含み、前記オイルによる前記コイルの冷却位置を調整する
請求項1または請求項2に記載の回転電機。 - 前記ロータカバーは金属で形成されるとともに、前記ロータの前記軸方向端面を覆い、
前記ロータの前記軸方向端面は、前記ロータカバーを介して前記オイルで冷却される
請求項1から請求項3のいずれか一項に記載の回転電機。 - 前記筐体は、前記コイルの上側から前記オイルを散布するオイル散布部と、前記オイル散布部に前記オイルを供給する給油路と、をさらに有し、
前記流路は、前記給油路から分岐した前記オイルを供給する
請求項1から請求項4のいずれか一項に記載の回転電機。
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CN202280063796.8A CN118020237A (zh) | 2021-09-22 | 2022-08-24 | 旋转电机 |
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JP2021-154029 | 2021-09-22 | ||
JP2021154029A JP7192941B1 (ja) | 2021-09-22 | 2021-09-22 | 回転電機 |
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CN214069749U (zh) * | 2020-11-10 | 2021-08-27 | 上海汽车变速器有限公司 | 电机转子油冷结构 |
CN113422472A (zh) * | 2021-01-25 | 2021-09-21 | 中国第一汽车股份有限公司 | 一种油冷电机冷却系统 |
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2021
- 2021-09-22 JP JP2021154029A patent/JP7192941B1/ja active Active
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2022
- 2022-08-24 WO PCT/JP2022/031826 patent/WO2023047875A1/ja active Application Filing
- 2022-08-24 CN CN202280063796.8A patent/CN118020237A/zh active Pending
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JP2007159325A (ja) | 2005-12-07 | 2007-06-21 | Shinko Electric Co Ltd | コイルの冷却機構 |
JP2009171755A (ja) * | 2008-01-17 | 2009-07-30 | Toyota Motor Corp | 回転電機 |
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JP2023045544A (ja) | 2023-04-03 |
CN118020237A (zh) | 2024-05-10 |
JP7192941B1 (ja) | 2022-12-20 |
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