WO2022024682A1 - カーボンアースブラシ - Google Patents

カーボンアースブラシ Download PDF

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Publication number
WO2022024682A1
WO2022024682A1 PCT/JP2021/025432 JP2021025432W WO2022024682A1 WO 2022024682 A1 WO2022024682 A1 WO 2022024682A1 JP 2021025432 W JP2021025432 W JP 2021025432W WO 2022024682 A1 WO2022024682 A1 WO 2022024682A1
Authority
WO
WIPO (PCT)
Prior art keywords
contact surface
sliding contact
slit
brush
rotating shaft
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
Application number
PCT/JP2021/025432
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
太輔 服部
祐馬 福田
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tris Inc
Original Assignee
Tris Inc
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 Tris Inc filed Critical Tris Inc
Priority to KR1020237005947A priority Critical patent/KR102687086B1/ko
Priority to US18/018,285 priority patent/US12255429B2/en
Priority to CN202180058243.9A priority patent/CN116057818A/zh
Priority to EP21848147.1A priority patent/EP4191843A4/en
Priority to JP2022540111A priority patent/JP7424681B2/ja
Publication of WO2022024682A1 publication Critical patent/WO2022024682A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/18—Contacts for co-operation with commutator or slip-ring, e.g. contact brush
    • H01R39/26—Solid sliding contacts, e.g. carbon brush
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/64—Devices for uninterrupted current collection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/06—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for removing electrostatic charges
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/56—Devices for lubricating or polishing slip-rings or commutators during operation of the collector
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R2201/00—Connectors or connections adapted for particular applications
    • H01R2201/26—Connectors or connections adapted for particular applications for vehicles
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R39/00—Rotary current collectors, distributors or interrupters
    • H01R39/02—Details for dynamo electric machines
    • H01R39/36—Connections of cable or wire to brush
    • 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
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/64—Electric machine technologies in electromobility

Definitions

  • the present invention relates to a carbon earth brush that is in sliding contact with a rotating shaft for transmitting driving force exposed to an insulating liquid.
  • the power transmission mechanism of various mechanical devices can transmit propulsive force and generate electricity with a generator by transmitting power via a rotating shaft and gears.
  • a current is generated in the system, both intended and unintended, and the troubles associated therewith become a problem.
  • the rotating shaft for transmitting the output of the driving force source such as a motor and engine to the driving wheels is the ATF (automatic transmission fluid). Being exposed. If this rotating shaft is not grounded, an electric current (including intentional and unintended ones) will be generated in the AT system, electric corrosion will occur due to the potential difference between the rotating shaft and other parts of the AT, and electromagnetic noise will occur. Occurs. It was
  • the ATF enters between the brush and the rotating shaft, and the contact resistance between the two increases.
  • the contact resistance rapidly increases from a certain number of rotations.
  • Patent Document 1 (Actual Kaisho 61-74269) discloses that a groove is provided on the brush surface of an electric motor.
  • the groove is provided on the brush surface which is the sliding contact surface with the commutator.
  • the commutator of an electric motor is cylindrical, and the sliding contact surface of the brush immediately after manufacturing (the surface that is in sliding contact with the commutator, etc.) is planar, so the brush is deformed so that the sliding contact surface of the brush is deformed along the commutator. It is necessary to transform it by familiar operation. Further, in Patent Document 1, by providing a groove on the brush surface, the sliding contact surface is worn at an early stage, and the familiar operation is shortened.
  • An object of the present invention is to provide a carbon earth brush capable of grounding a current generated in a mechanical device such as an AT with a small contact resistance by using a rotating shaft for transmitting a driving force exposed to an insulating liquid. It is in.
  • the present invention is a carbon earth brush for grounding the rotating shaft by sliding contact with a rotating shaft for transmitting a driving force exposed to an insulating liquid on a sliding contact surface.
  • a slit is provided in the sliding contact surface, and at least one end of the slit is located on one side of the sliding contact surface, and the insulating liquid pushed toward the sliding contact surface side by the rotation of the rotating shaft is guided into the slit. It is characterized in that it is configured to escape from the one end.
  • the slit in the present invention does not initially adapt the sliding contact surface of the brush, and it is preferable that the slit always exists during the period of use of the brush. Therefore, the slit preferably has a depth equal to or greater than the effective use length of the brush.
  • the effective length of the brush refers to the length of wear during the period of use of the brush (for example, the mileage within the period of use of the electric vehicle). If the slit depth is set to be equal to or greater than the effective brush length, the grounding performance can be guaranteed during the period of use of the AT or mechanical device in which the brush is used.
  • the present inventor calculated the effective length of the brush as 18 mm when the mileage of the automobile is 300,000 km and 0.5 mm when the mileage is 10,000 km. Therefore, the depth of the slit is, for example, 0.5 mm or more, preferably 3 to 20 mm, and particularly preferably 10 to 20 mm.
  • the slit in the present invention provides an escape route for the insulating liquid pushed into the sliding contact surface by the rotation of the rotating shaft.
  • the insulating liquid is pushed between the sliding contact surface and the rotating shaft, so that the grounding of the rotating shaft by the carbon brush tends to be incomplete.
  • the insulating liquid pushed toward the sliding contact surface side is absorbed by the slit and escapes from the end of the slit to the outside of the carbon brush. Therefore, even if the rotating shaft rotates, the rotating shaft can be reliably grounded. In particular, even if the rotating shaft rotates at high speed, the increase in contact resistance between the sliding contact surface and the rotating shaft can be reduced.
  • the present invention can be achieved if slits are provided at least in one place around the brush sliding contact surface.
  • a slit may be provided on one side thereof.
  • the slit does not have to reach the other peripheral portion from the peripheral portion of the brush sliding contact surface. That is, the slit is either an opening (both ends of the slit reach two different sides of the brush sliding contact surface), a closing (only one end of the slit reaches the side of the sliding contact surface), or a combination of an opening and a closing. It may be.
  • the slit When the slit has an opening shape, the liquid (fluid) having an oil film formed on the sliding contact surface can be more easily discharged, and the formation of the insulating film due to the insulating liquid (fluid) can be reduced. Furthermore, the slits may be opened at three or more places. For example, if the slits are provided in a grid pattern, the insulating liquid can be more easily discharged from the sliding contact surface.
  • the insulating liquid is the ATF (automatic transmission fluid) in the AT (automatic transmission) of the automobile, and the grounding shaft is the power transmission shaft in the AT exposed to the ATF.
  • the use of the brush of the present invention is arbitrary.
  • the carbon component may be conductive, powdery, and capable of forming a sintered body.
  • the carbon component is, for example, graphite, which may be artificial graphite, natural graphite, or the like, but coke, carbon black, activated carbon, charcoal, coal, or the like may be used.
  • the brush may contain copper alloy powder such as copper powder, silver powder, brass powder, tin powder, or metal powder such as a mixture thereof, and the type, average particle size, and content of the metal powder are arbitrary. Is.
  • the carbon earth brush of the present invention suppresses the electric corrosion of the rotating shaft and the like by discharging the electric charge generated on the rotating shaft, and also suppresses the generation of noise such as electromagnetic noise from the rotating shaft.
  • the insulating liquid pushed toward the sliding contact surface side by the rotating shaft can be released by the slit. Therefore, the contact resistance between the rotating shaft and the sliding contact surface can be reduced, and the generation of electrolytic corrosion and electromagnetic noise can be suppressed.
  • the effect of the present invention is exhibited when the rotating shaft is rotated at high speed and the action of pushing the liquid becomes stronger.
  • FIGS. 1 to 8 show examples and their modifications.
  • FIG. 1 shows an electric vehicle using the carbon earth brush 8 of the embodiment (hereinafter, simply referred to as “brush 8” or “brush”). Drive the shaft 16.
  • the output shaft 16 drives the drive wheels 18 via the differential gear 17.
  • the ATF is housed in the AT6, and the rotating shaft 14 is exposed to the ATF in the AT6. Then, the brush 8 grounds the rotating shaft 14 toward the vehicle body 2 in the AT6.
  • the target vehicle is an electric vehicle, but a hybrid vehicle, a gasoline vehicle, a diesel vehicle, or the like may be used.
  • FIG. 2 shows an example of AT6, in which the crank shaft 5 is connected to the rotary shaft 14 in the AT6 via the torque converter 10, and the rotary shaft 14 drives the output shaft 16 via the transmission 12.
  • the rotating shaft 14 is constantly exposed to ATF 7, and its surface is wet by ATF. Due to the torque converter 10, the transmission 12, and the ATF 7, the grounding of the rotating shaft 14 is incomplete, and it is charged by static electricity or the like, and if left unattended, it causes electrolytic corrosion and electromagnetic noise. It was
  • FIGS. 3 to 6 show four types of sliding contact surfaces with the brush of the example, and these are examples.
  • the sliding contact surface 20 has, for example, two grid-shaped slits 21 in each of the vertical and horizontal directions, and the sliding contact surface 20 is divided into, for example, nine convex portions 22 by the slits 21.
  • the sliding contact surface 30 has, for example, four convex portions. It is divided into 32.
  • the longitudinal direction of the slit 31 may be oblique or orthogonal to the rotation direction of the rotation axis 14.
  • the slits 21, 31, and 41 extend to the two ends of the sliding contact surfaces 20, 30, and 40.
  • the ATF in the slits 21, 31, and 41 is easily discharged from the sliding contact surfaces 20, 30, 40. Therefore, as shown in FIGS. 3 to 5, a brush in which each slit extends to two sides having different sliding contact surfaces is preferable.
  • the grid-shaped slit 21 of FIG. 3 is particularly preferable because the ATF can be discharged from the convex portion 22 in a short distance.
  • all four slits 51 have a closed shape and are provided with different orientations of, for example, 90 °, and each slit 51 intersects only one side of the sliding contact surface 50 and is in sliding contact.
  • the convex portion 52 of the surface 50 is not divided.
  • the four sides of the sliding contact surface 50 intersect with the slit 51. It is preferable that the slit intersects at least two sides of the sliding contact surface.
  • the number of slits 21, 31, 41, 51 is, for example, 1 or more and 6 or less, and preferably 3 or more and 5 or less.
  • FIG. 7 shows the side surface of the brush 8, and the lead wire 24 is fixed to the brush 8 on the side away from the sliding contact surface 20.
  • the sliding contact surface 20 is, for example, a square, and the size of one side is H.
  • the sliding contact surface with the brush 8 is preferably a rectangle or the like.
  • L be the distance from the sliding contact surface 20 to the center of the mounting position of the lead wire 24, and let D be the depth from the sliding contact surface 20 to the bottom of the slit 21.
  • the slit 21 should always be present while the brush 8 is in use, and its depth D is longer than the effective length of the brush 8.
  • the ratio of the area of the slit to the area of the entire sliding contact surface is about 1/3 in FIGS. 3 to 6, and it is easy to secure the actual contact area between the rotating shaft and the brush and to easily attach the ATF from the sliding contact surface. It was reduced to about 1/3 in consideration of making it possible to discharge it.
  • the preferred range of this ratio is 20% or more and 40% or less, and more preferably 25% or more and 40% or less.
  • the area of the entire sliding contact surface means the total area of the slit and the convex portion.
  • the width ws of the slits 21, 31, 41, 51 means the width perpendicular to the long side direction of the slit.
  • the width ws is preferably 0.2 mm or more and 1 mm or less, and particularly preferably 0.4 mm or more and 0.8 mm or less, from the viewpoint of facilitating processing and narrowing the distance between the slits as much as possible.
  • the depth D of the slits 21, 31, 41, 51 is preferably 0.5 mm or more, for example, 3 mm or more and 20 mm or less, and particularly preferably 10 mm or more and 20 mm or less.
  • the brush 8 and the like excluding the lead wire 24 contain graphite such as natural graphite and artificial graphite, and carbon such as coke, carbon black, activated carbon, coal, and charcoal, and graphite is particularly preferable. Further, the brush 8 or the like excluding the lead wire 24 may contain metals such as Cu, Al, Mg, Fe, Ag, Au, Ni, Sn, and Zn in addition to carbon.
  • the scaly natural graphite was treated with a binder and pulverized with an impact type crusher to obtain a powder of 80 mesh pass.
  • the material powder was put into the mold from the hopper, the tip of the lead wire was embedded, and the mold was molded.
  • the brush was sintered at 700 ° C. and cut into the brushes shown in FIGS. 3 to 6.
  • the size of the brush is a square shape with a length of 10 mm in the direction perpendicular to the sliding contact surface, 7 mm up to the attachment position of the lead wire, and a sliding contact surface of 5 mm on each side.
  • the brush 8 or the like is provided with a slit 21 or the like having a width ws of about 0.6 mm and a depth D of 5 mm by cutting.
  • the contact resistance of the brush 28 in FIG. 4 with the rotating shaft 14 was measured.
  • the slit width ws is about 0.6 mm, the depth D is 5 mm, and the width of the convex portion 32 is about 0.8 mm.
  • the contact resistance in the high speed rotation range is smaller.
  • the brush 28 was brought into contact with the rotating shaft 14 in the AT6 of a commercially available automobile by a spring (not shown), the rotation speed of the rotating shaft 14 was changed, and the contact resistance was measured.
  • the longitudinal direction of the slit 21 is parallel to the rotation direction of the rotation shaft 14, and in the second embodiment, it is a right angle.
  • a comparative example is a brush having a flat sliding contact surface without a slit 31, the composition and manufacturing conditions are the same as those of Examples 1 and 2, and the difference is the presence or absence of the slit 31.
  • a durability test was conducted until the brush 28 was worn by about 4 mm, but no damage such as chipping of the convex portion 32 could be confirmed. The results are shown in the table and FIG.
  • the contact resistance was small in both the example and the comparative example up to a peripheral speed of 2 m / s, but the contact resistance of the comparative example increased sharply from 5.4 m / s. Note that 27.5 ⁇ is a value that is normally considered to be incomplete in grounding. On the other hand, in both Examples 1 and 2, the contact resistance was within the permissible range up to a peripheral speed of 15 m / s. Moreover, the difference between the rotation direction of the rotation axis and the direction of the slit was slight. It was
  • the shaft in the AT of the automobile is grounded, but if the rotating shaft for driving exposed to the insulating liquid is grounded, the motor spindle, the axle, the shaft of the shaft flow pump, etc. It can be used for any purpose.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Current Collectors (AREA)
  • Arrangement Of Transmissions (AREA)
  • Power Engineering (AREA)
PCT/JP2021/025432 2020-07-31 2021-07-06 カーボンアースブラシ Ceased WO2022024682A1 (ja)

Priority Applications (5)

Application Number Priority Date Filing Date Title
KR1020237005947A KR102687086B1 (ko) 2020-07-31 2021-07-06 카본 접지 브러시
US18/018,285 US12255429B2 (en) 2020-07-31 2021-07-06 Carbon grounding brush
CN202180058243.9A CN116057818A (zh) 2020-07-31 2021-07-06 接地碳刷
EP21848147.1A EP4191843A4 (en) 2020-07-31 2021-07-06 CARBON GROUNDING BRUSH
JP2022540111A JP7424681B2 (ja) 2020-07-31 2021-07-06 カーボンアースブラシ

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2020130285 2020-07-31
JP2020-130285 2020-07-31

Publications (1)

Publication Number Publication Date
WO2022024682A1 true WO2022024682A1 (ja) 2022-02-03

Family

ID=80035537

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2021/025432 Ceased WO2022024682A1 (ja) 2020-07-31 2021-07-06 カーボンアースブラシ

Country Status (6)

Country Link
US (1) US12255429B2 (https=)
EP (1) EP4191843A4 (https=)
JP (1) JP7424681B2 (https=)
KR (1) KR102687086B1 (https=)
CN (1) CN116057818A (https=)
WO (1) WO2022024682A1 (https=)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023103008A1 (de) * 2023-02-08 2024-08-08 Schaeffler Technologies AG & Co. KG Stromübertragungseinrichtung und elektrische Maschine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023134762A1 (de) * 2023-12-12 2025-06-12 Schaeffler Technologies AG & Co. KG Schleifbürste für eine elektrische Maschine und Bürstenmodul

Citations (5)

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Publication number Priority date Publication date Assignee Title
JPS51154304U (https=) * 1975-06-04 1976-12-09
JPS5999669U (ja) * 1982-12-24 1984-07-05 株式会社日立製作所 液体般送ポンプ
JPS6174269U (https=) 1984-10-19 1986-05-20
JPS63218179A (ja) * 1987-03-05 1988-09-12 トライス株式会社 液体燃料中で使用するための電刷子
JP2018167653A (ja) * 2017-03-29 2018-11-01 三菱自動車工業株式会社 電動車両用動力伝達機構のアース構造

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US5354607A (en) * 1990-04-16 1994-10-11 Xerox Corporation Fibrillated pultruded electronic components and static eliminator devices
JPH0982440A (ja) * 1995-09-12 1997-03-28 Exedy Corp スリップリング
DE29802144U1 (de) * 1998-02-09 1998-04-02 Deutsche Carbone Ag, 60437 Frankfurt Kohlebürste für Elektro-Kraftstoffpumpen
KR101990756B1 (ko) * 2014-07-17 2019-06-18 도라이스 가부시키가이샤 연료펌프 모터의 라미네이트 카본 브러시
DE112016002367A5 (de) * 2015-05-27 2018-02-15 Ac2T Research Gmbh Kommutator für einen bürstenkommutierten Elektromotor mit verlängertem Kommutierungsintervall
JP2017055622A (ja) * 2015-09-11 2017-03-16 株式会社豊田自動織機 スリップリング機構
CN108880129B (zh) * 2018-08-17 2024-07-09 摩腾科技（上海）有限公司 一种刷握组件及碳刷架
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Publication number Priority date Publication date Assignee Title
JPS51154304U (https=) * 1975-06-04 1976-12-09
JPS5999669U (ja) * 1982-12-24 1984-07-05 株式会社日立製作所 液体般送ポンプ
JPS6174269U (https=) 1984-10-19 1986-05-20
JPS63218179A (ja) * 1987-03-05 1988-09-12 トライス株式会社 液体燃料中で使用するための電刷子
JP2018167653A (ja) * 2017-03-29 2018-11-01 三菱自動車工業株式会社 電動車両用動力伝達機構のアース構造

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Title
See also references of EP4191843A4

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102023103008A1 (de) * 2023-02-08 2024-08-08 Schaeffler Technologies AG & Co. KG Stromübertragungseinrichtung und elektrische Maschine

Also Published As

Publication number Publication date
EP4191843A1 (en) 2023-06-07
US12255429B2 (en) 2025-03-18
KR102687086B1 (ko) 2024-07-19
EP4191843A4 (en) 2024-08-14
JPWO2022024682A1 (https=) 2022-02-03
JP7424681B2 (ja) 2024-01-30
US20230299547A1 (en) 2023-09-21
CN116057818A (zh) 2023-05-02
KR20230041768A (ko) 2023-03-24

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