WO2025045543A1 - Ensemble balai de mise à la terre - Google Patents

Ensemble balai de mise à la terre Download PDF

Info

Publication number
WO2025045543A1
WO2025045543A1 PCT/EP2024/072386 EP2024072386W WO2025045543A1 WO 2025045543 A1 WO2025045543 A1 WO 2025045543A1 EP 2024072386 W EP2024072386 W EP 2024072386W WO 2025045543 A1 WO2025045543 A1 WO 2025045543A1
Authority
WO
WIPO (PCT)
Prior art keywords
mounting plate
brush
support
radial portion
axially
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.)
Pending
Application number
PCT/EP2024/072386
Other languages
English (en)
Inventor
Anthony SIMONIN
Emmanuel Benevise
Thomas Perrotin
Bruno Constant
Benoit Arnault
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.)
SKF AB
Original Assignee
SKF AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by SKF AB filed Critical SKF AB
Priority to CN202480054301.4A priority Critical patent/CN121753228A/zh
Publication of WO2025045543A1 publication Critical patent/WO2025045543A1/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/14—Means for supporting or protecting brushes or brush holders
    • 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
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/002—Conductive elements, e.g. to prevent static electricity
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/40—Structural association with grounding devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/04—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly
    • F16C19/06—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for radial load mainly with a single row or balls
    • 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
    • F16C2380/00—Electrical apparatus
    • F16C2380/26—Dynamo-electric machines or combinations therewith, e.g. electro-motors and generators
    • 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
    • H01R39/24—Laminated contacts; Wire contacts, e.g. metallic brush, carbon fibres

Definitions

  • the present invention relates to the field of earthing devices for controlling the shaft current generated in electric motors or machines, and in particular earthing brush assemblies.
  • At least one rolling bearing is mounted between the housing of the electric motor or machine and the rotary shaft so as to support this shaft.
  • the electric current passing through the components of the rolling bearing can damage these components, in particular the rolling elements and the raceways formed on the inner and outer races. Electrical discharges can also generate vibrations.
  • earthing brush comprising conductive fibres.
  • the earthing brush is generally mounted in the bore of the housing of the electric motor in such a way that the free ends of the fibres are in radial contact with the outer surface of the rotary shaft.
  • the brush is kept at the same electrical potential as the housing of the electric motor.
  • the inner and outer races of the rolling bearing are also at the same electrical potential, which reduces or even eliminates problematic electrical discharges through the rolling bearing.
  • the present invention aims to remedy this drawback.
  • the invention relates to an earthing brush assembly
  • an earthing brush assembly comprising an earthing brush provided with a plurality of conductive fibres and with a support inside which the conductive fibres are mounted.
  • the assembly also comprises a brush mounting plate which is secured to the support of the brush.
  • the mounting plate comprises a radial portion and at least one centring portion extending the radial portion at least axially, which is offset radially outwards with respect to the support and has an outer surface defining the outside diameter of the mounting plate.
  • the mounting plate comprises at least one collar extending at least axially from the radial portion on the side opposite the support.
  • said collar of the mounting plate makes it possible to keep an axial space between the brush and the bearing or the housing.
  • said collar of the mounting plate extends a small-diameter edge of the radial portion. This simplifies the manufacture of the mounting plate. Alternatively, it remains possible to make provision for said collar to extend another zone of the radial portion.
  • said collar of the mounting plate is made in one piece with the radial portion. This simplifies the manufacture of the mounting plate. Said collar may be formed by locally deforming the material of the radial portion.
  • said collar may be a part which is distinct from the radial portion of the mounting plate and attached thereto by any appropriate means, for example by adhesive bonding. After attachment, said collar extends at least axially from the radial portion of the mounting plate.
  • said collar of the mounting plate is annular, i.e. extends circumferentially over 360°.
  • said collar could extend over an angular sector of less than 360° and thus be open at a point on its circumference.
  • the mounting plate could comprise at least two collars extending at least axially from the radial portion on the side opposite the support and spaced apart from one another in the circumferential direction.
  • the brush may be mounted axially against the radial portion of the mounting plate.
  • the brush may be mounted axially against another radial portion of the mounting plate.
  • the mounting plate may comprise a plurality of tongues for retention of the support of the brush, extending from the radial portion. Said centring portion may be offset radially outwards with respect to the retention tongues.
  • the mounting plate comprises a plurality of centring portions spaced apart in the circumferential direction.
  • the mounting plate may comprise an annular centring portion.
  • the mounting plate may be made as a single piece.
  • the invention further relates to an electric motor comprising a housing, a shaft and at least one earthing brush assembly as defined hereinabove and mounted radially between the housing and the shaft, the conductive fibres of the brush of said assembly being in contact with the shaft.
  • FIG 1 is a view in axial section of an earthing brush assembly mounted radially between a rotary shaft and a housing of an electric motor
  • FIG 3 are perspective views of an earthing brush assembly according to an exemplary embodiment of the invention.
  • FIG 4 is a face-on view of the earthing brush assembly of Figures 2 and 3, and
  • FIG 5 is a view in section along line V-V in Figure 4.
  • Figure 1 shows, in axial section, part of an electric motor 10 or machine comprising a fixed housing 12, a rotary shaft 14, of axis X-X, which is supported radially by a rolling bearing 16.
  • the bearing 16 is mounted radially between the housing 12 and the rotary shaft 14.
  • the bearing is of the ball bearing type.
  • the motor 10 further comprises an earthing brush assembly 20 which is mounted radially between the bore 12a of the housing 12 and the outer cylindrical surface 14a of the rotary shaft 14.
  • the earthing brush assembly 20 serves to continuously dissipate the electrical charge that builds up on the shaft 14 of the motor when the motor is in operation, by transferring this charge to the housing 12.
  • the earthing brush assembly 20 has an annular overall shape.
  • the assembly 20 comprises an earthing brush 30 and a brush mounting plate 40 which is configured to centre said brush 30 radially.
  • the mounting plate 40 is also configured to keep an axial space between the brush 30 and the bearing or the housing.
  • the brush 30 comprises a plurality of conductive individual fibres 31 which are intended to come around the rotary shaft of the motor.
  • the conductive fibres 31 may be made from carbon, stainless steel, conductive plastics, such as fibres made from acrylic or nylon.
  • the brush 30 further comprises a holding or support member 32, inside which the conductive fibres 31 are mounted.
  • the support 32 is in the form of an open ring.
  • the support 32 may be produced by cutting and pressing.
  • the support 32 is made from an electrically conductive material such as aluminium, stainless steel, bronze, copper or another material.
  • the support 32 may be made from an electrically non-conductive material with a conductive coating or a conductive paint.
  • the support 32 comprises an axial mounting portion 34 and two opposite lateral flanks 36, 38 extending inwards from the mounting portion 34 and axially gripping the conductive fibres 31.
  • the conductive fibres 31 press axially on each side against the lateral flanks 36, 38.
  • the conductive fibres 31 press axially on each side against the internal faces of the lateral flanks 36, 38.
  • the mounting portion 34 and the two lateral flanks 36, 38 delimit a channel which is open radially on the inside and inside which the conductive fibres 31 are partially positioned.
  • the conductive fibres 31 are bent around a connecting wire 39 of the support 32.
  • the free distal end of the conductive fibres 31 is intended to come into radial contact with the outer surface of the rotary shaft of the motor.
  • the proximal end of the conductive fibres 31 is in radial contact with the mounting portion 34 of the support.
  • the lateral flank 36 extends one end of the mounting portion 34, and the lateral flank 38 extends the opposite end of said portion.
  • the lateral flanks 36, 38 extend obliquely inwards from the mounting portion 34.
  • the lateral flanks 36, 38 are symmetrical with each other about a radial midplane of the support 32.
  • the mounting portion 34 here extends axially. Alternatively, the mounting portion 34 could extend obliquely.
  • the brush 30 is in the form of an open ring, as can be seen in particular in Figures 2 and 3. This allows the brush to adapt to suit different diameters of motor shaft. In general, the ends of the brush are not joined together. As a variant, it is possible to join these ends of the brush 30 together.
  • the mounting plate 40 comprises an annular radial portion 42, and a plurality of centring tongues 44 extending from the radial portion 42.
  • the radial portion 42 of the mounting plate bears axially against the support 32 of the brush 30. More specifically, the radial portion 42 bears axially against the lateral flank 36 of the support.
  • the tongues 44 are spaced apart from one another in the circumferential direction, in this instance evenly. As an alternative, it could be possible to provide an irregular circumferential spacing. In the exemplary embodiment illustrated, there are eight tongues 44. As an alternative, it is possible to provide a greater or smaller number of tongues 44. It is possible to provide two tongues 44, or at least four tongues. Preferably, the number of tongues 44 is at least equal to two.
  • Each tongue 44 protrudes axially with respect to the radial portion 42.
  • Each tongue 44 locally radially surrounds the support 32 of the brush 30 and is in radial contact with the mounting portion 34 of said support.
  • the support 32 is held axially bearing against the radial portion 42 of the mounting plate by the tongues 44.
  • the tongues 44 serve for axially and radially retaining the earthing brush 30.
  • the lateral flank 36 of the support bears against the radial portion 42 of the mounting plate, and the lateral flank 38 bears against the tongues 44.
  • the tongues 44 are in this case identical to one another.
  • each tongue 44 is provided with an axial portion extending axially from the radial portion 42, locally radially surrounding the support 32 and in radial contact therewith, and with a bentover portion at the free end of the axial portion.
  • the bent-over portion 44b of each tongue serves for axially retaining the support 32 of the earthing brush 30.
  • the bent-over portion 44b of each tongue is in axial contact against the lateral flank 38 of the support.
  • the mounting plate 40 of the brush also comprises a plurality of centring tabs 46 extending from the radial portion 42 and spaced apart from one another in the circumferential direction.
  • a cutout 48 ( Figure 2) is formed on the radial portion 42 between each pair of immediately successive tabs 46.
  • the tabs 46 are formed by cutting and bending the radial portion 42.
  • Each tab 46 axially extends the radial portion 42.
  • the tabs 46 extend obliquely from a large-diameter edge of the radial portion 42.
  • the tabs 46 extend axially from the same side as the tongues 44.
  • Each tab 46 locally radially surrounds the support 32 of the brush 30 while remaining separated therefrom.
  • the tabs 46 are partially offset radially outwards with respect to the tongues 44.
  • the tabs 46 are in this case identical to one another.
  • the tabs 46 define the outside diameter of the mounting plate 40.
  • Each tab 46 here extends obliquely. Alternatively, the tabs 46 could extend axially.
  • Each tab 46 is in the form of a portion of a cylinder.
  • each tab 46 is radially spaced apart from the support 32 by a non-zero radial distance.
  • the outer surfaces of the tabs 46 define the outside diameter of the mounting plate 40. The tabs 46 provide the centring of the mounting plate once it has been mounted in the bore of the housing of the associated electric motor.
  • each tab 46 is spaced apart from one another in the circumferential direction, in this instance evenly. As an alternative, it could be possible to provide an irregular circumferential spacing. Each tab 46 is positioned in the circumferential direction between two immediately successive tongues 44. Each tab 46 is spaced apart in the circumferential direction from the two immediately adjacent tongues 44. In this instance, each tab 46 has a circumferential dimension greater than that of the tongues 44.
  • the mounting plate 40 is also configured to keep an axial space between the brush 30 and the bearing or the housing.
  • the mounting plate 40 further comprises a collar 50 axially extending the radial portion 42 axially on the side opposite the tongues 44 and the tabs 46, as can be seen in Figures 3 and 5.
  • the collar 50 axially extends the radial portion 42 on the side opposite the support 32.
  • the collar 50 extends outwards.
  • the collar 50 here extends axially.
  • the collar 50 could extend obliquely, in other words axially and radially.
  • the collar 50 is of annular shape.
  • the collar 50 extends a small-diameter edge of the radial portion 42.
  • the mounting plate 40 of the earthing brush assembly comprises a plurality of centring tabs 46.
  • the tabs could be replaced by an annular flange forming an annular centring portion.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Motor Or Generator Frames (AREA)

Abstract

La présente invention concerne un ensemble balai de mise à la terre (20) comprenant un balai de mise à la terre (30) pourvu d'une pluralité de fibres conductrices (31) et d'un support (32) dans lequel les fibres conductrices sont montées, ainsi qu'une plaque de montage de balai (40) qui est fixée sur le support (32) du balai. La plaque de montage comprend une partie radiale (42) et au moins une partie de centrage (46) prolongeant au moins axialement la partie radiale (42), qui est décalée radialement vers l'extérieur par rapport au support (32) et présente une surface externe délimitant le diamètre extérieur de la plaque de montage (18). La plaque de montage (40) comprend au moins une collerette (50) s'étendant au moins axialement depuis la partie radiale (42) du côté opposé au support (32).
PCT/EP2024/072386 2023-08-30 2024-08-07 Ensemble balai de mise à la terre Pending WO2025045543A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202480054301.4A CN121753228A (zh) 2023-08-30 2024-08-07 接地刷组件

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR2309087A FR3152666A1 (fr) 2023-08-30 2023-08-30 Ensemble de brosse de mise à la terre
FR2309087 2023-08-30

Publications (1)

Publication Number Publication Date
WO2025045543A1 true WO2025045543A1 (fr) 2025-03-06

Family

ID=89322104

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2024/072386 Pending WO2025045543A1 (fr) 2023-08-30 2024-08-07 Ensemble balai de mise à la terre

Country Status (3)

Country Link
CN (1) CN121753228A (fr)
FR (1) FR3152666A1 (fr)
WO (1) WO2025045543A1 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210021180A1 (en) 2018-03-20 2021-01-21 Aktiebolaget Skf Fiber grounding brush assembly
FR3110650A1 (fr) * 2020-05-25 2021-11-26 Skf Ensemble isolateur-conducteur pour roulements avec conducteur à agrafes de fixation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210021180A1 (en) 2018-03-20 2021-01-21 Aktiebolaget Skf Fiber grounding brush assembly
FR3110650A1 (fr) * 2020-05-25 2021-11-26 Skf Ensemble isolateur-conducteur pour roulements avec conducteur à agrafes de fixation

Also Published As

Publication number Publication date
FR3152666A1 (fr) 2025-03-07
CN121753228A (zh) 2026-03-27

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