EP4605660A1 - Anneau d'équilibrage électrique, et palier à roulement comprenant un tel anneau - Google Patents
Anneau d'équilibrage électrique, et palier à roulement comprenant un tel anneauInfo
- Publication number
- EP4605660A1 EP4605660A1 EP22862407.8A EP22862407A EP4605660A1 EP 4605660 A1 EP4605660 A1 EP 4605660A1 EP 22862407 A EP22862407 A EP 22862407A EP 4605660 A1 EP4605660 A1 EP 4605660A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- membrane
- ring
- reinforcement
- armature
- ring according
- 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
Links
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
- 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
-
- 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
-
- 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
- H01R39/022—Details for dynamo electric machines characterised by the materials used, e.g. ceramics
- H01R39/025—Conductive materials
Definitions
- Electric balancing ring, and rolling bearing comprising such a ring
- the present invention relates to an electrical balancing ring or grounding ring, used to pass electrical charges or an electric current between a fixed element and a rotating element movable in rotation relative to the fixed element around 'an axis of rotation.
- the ring is used to conduct electrical charges between a casing and a shaft of a machine, or more particularly between a stator and a rotor of an electrical machine.
- the invention thus relates to an electrical balancing ring comprising: a first armature, annular, rigid, mounted integrally on an element among the fixed element and the rotating element, an annular membrane, made of an elastic material, extending between a first end in contact with the first frame, and a second end in contact with the other element among the fixed element and the rotating element, said membrane having a body between the first end and the second end, a second armature, annular, rigid, mounted integral with the first armature and adapted to pinch and fix the membrane between the first armature and the second armature, and in which the first armature and the membrane are capable of conducting an electric current between the fixed element and the rotating element.
- a first object of the present invention is to provide an electrical balancing ring which is durable, that is to say having an electrical conduction which varies little over time.
- the wear zone of the membrane extends in the direction of the axis of rotation over a length greater than or equal to the thickness of the body of the membrane, the ring being in the mounting position between the the fixed element and the rotating element.
- the wear zone has a thickness greater than the thickness of the body of the membrane.
- the wear zone has a mass configured to ensure contact between the surface of contact and the sliding surface for a range of rotational speed of the rotating element.
- the membrane comprises radial slots extending to the second frame and ending in an open portion.
- the membrane comprises an electrically conductive coating, said coating being at least on the contact surface of the wear zone.
- the membrane is formed from a PTFE material containing a conductive filler, such as carbon.
- the second armature is capable of conducting an electric current between the fixed element and the rotating element.
- the radial height of the second frame is at least twice greater than the radial height of the first frame, and the radial height of the first frame is less than half the distance between the fixed element and the rotating element.
- first reinforcement and/or the second reinforcement comprise pins adapted to penetrate the membrane and secure the membrane to the first and/or second reinforcement.
- a second object of the present invention is to provide a rolling bearing comprising an electrical balancing ring according to the characteristics previous, and rolling bodies arranged in a rolling space to allow the relative rotation of the rotating element with respect to the fixed element around the axis of rotation.
- FIG. 1 is a sectional view of an electrical balancing ring according to the present disclosure
- FIG. 2 is a view identical to Figure 1 showing dimensions of the elements of the ring;
- FIG. 3 is a partial front view showing a variant of the ring of Figure 1 comprising radial slots;
- Figure 4A, Figure 4B, Figure 4C and Figure 4D show variant shapes of the wear zone of the ring of the type of Figure 1;
- FIG. 5 is a sectional view of an electrical balancing ring of the type of Figure 1 further comprising a sealing member;
- FIG. 6 is a sectional view of a rolling bearing incorporating an electrical balancing ring of the type of Figure 1.
- Figure 1 shows an embodiment of an electrical balancing ring 10 which is intended to be mounted between a fixed element 11 and a rotating element 12 movable in rotation relative to the fixed element around an axis of rotation AX.
- Ring 10 includes: - a first armature 20, of the annular type around the axis of rotation, which is rigid and which is mounted integral with one element among the fixed element 11 and the rotating element 12,
- armature 40 also of the annular type around the axis of rotation, which is rigid and which is mounted integral with the first armature 30.
- the first armature 20 and the membrane 30 are capable of conducting an electric current, in particular so that an electric current can flow between the fixed element 11 and the rotating element 12, or vice versa.
- the membrane 30 extends between a first end 31 in contact with the first frame 20, and a second end 32 in contact with the other element among the fixed element and the rotating element.
- the membrane 30 comprises a body 33 between the first end 31 and the second end 32.
- the fixed element 11 can be an external element, i.e. the furthest from the axis of rotation AX, i.e. located around the rotating element 12 which is then an internal element.
- a rotating element 12 which is a rotating shaft (figure 1).
- the fixed element 11 can be an internal element, i.e. closest to the axis of rotation AX, i.e. located inside the rotating element which is then an external element.
- the first armature 20 is connected to the external fixed element 11, and that the second end 32 is in contact with the other element, ie the internal rotating element 12 , but of course the other use is also suitable for the present disclosure.
- the second frame 40 is adapted to pinch and fix the membrane 30 between the first frame 20 and the second frame 40.
- the membrane 30 is fixed by pinching between the first frame and the second frame, for example at the time of fixing of the second frame 40 on the first frame 20.
- the membrane 30 comprises a wear zone ZU at the second end 32 of said membrane 30.
- This wear zone ZU is thicker than the body 33 of the membrane 30.
- the thickness of the body 33 of the membrane is denoted (e), this thickness being taken in a direction substantially perpendicular to the core of the body of the membrane 30.
- the thickness of the wear zone ZU of the membrane 30 is denoted (b ), this thickness is taken in a direction perpendicular to the axis of rotation AX, in the mounting position of the ring on the rotating element 12.
- the wear zone ZU thus forms a contact surface 34 configured to slide in contact on a sliding surface 14 of the other element, i.e. the rotating element 12 of Figure 1.
- the electrical balancing ring 10 can therefore conduct an electric current from the rotating element 12 to the membrane 30 through contact of the contact surface 34 of the wear zone ZU at the second end 32 of the membrane 30, then by the body 33 of the membrane 30 towards the first frame 20 in contact with the first end 31 of the membrane 30, then by the first frame 20 towards the fixed element 11 thanks to the contact between this first frame 20 and the element fixed 11. Electrical conduction can also take the opposite path. Electrical conductivity of the balancing ring electrical 10 is thus high, and makes it possible to efficiently evacuate electrical charges.
- the sliding and possibly the friction of the contact surface 34 of the membrane 3 on the sliding surface 14 causes wear of this contact surface and wear of the wear zone ZU which reduces in thickness.
- the thickness of this wear zone ZU which is thicker than the body 33 of the membrane 30, makes it possible to maintain an area of the contact surface 34 substantially constant, as long as the wear zone ZU is not completely worn out. : as long as its thickness does not tend towards zero.
- the electrical conductivity of the ring can remain constant over a very long operating time.
- the wear zone ZU of the membrane 30 extends in the direction of the axis of rotation AX over a length (a).
- this length (a) is greater than 1 mm, and it can be greater than 2 mm.
- the contact surface 34 has an area S34 of:
- the diameter of the rotating element 12 has the length of the wear zone ZU.
- the ring 10 has a high electrical conductivity.
- this electrical conductivity can be increased.
- the wear zone ZU also has a thickness (b), this thickness (b) being taken in a direction perpendicular to the direction of the axis of rotation (AX), in the mounting position.
- this thickness (b) is greater than the thickness (e) of the body 33 of the membrane 30, and preferably greater than twice the thickness (e) of the body 33 of the membrane 30.
- the zone d The wear is sufficiently thick to ensure a significant longevity for the ring 10, while maintaining constant and high electrical conductivity.
- the thickness (e) of the membrane 30 is between 0.4 mm and 1 mm.
- the thickness (b) of the wear zone ZU is then between 0.5 mm and 3 mm.
- the second frame 40 is for example mounted integrally inside the first frame 30, possibly by fitting or crimping.
- the first frame 20 and the second frame 40 have an L shape nested one inside the other.
- Each of these frames 20, 40 is formed of a cylindrical sleeve 21, 41 which extends in the direction of the axis of rotation AX, extended by a lateral annular flange 22, 42 perpendicular to the axis of rotation AX and inwards towards this axis of rotation.
- the cylindrical sleeve 21 of the first frame 20 is then adapted to be fitted by fitting into a recessed cylindrical housing 13 of the fixed element 11.
- the annular membrane 30 has an external diameter adapted to be housed in the cylindrical sleeve 21 of the first frame 20, a first face 35 of the first end 31 of this membrane 30 against the lateral annular flange 22 of the first frame 20.
- the cylindrical sleeve 41 of the second frame 40 is then adapted to be fitted by fitting into the internal surface of the cylindrical sleeve 21 of the first frame 20, until it presses the lateral annular flange 42 of the second frame 40 against a second face 36 of the membrane 30 (at its first end 31, and therefore up to pinching the first end 31 of the membrane 30.
- the second frame 40 has a radial height (h) of the side flange 42 greater than a radial height (g) of the side flange 22 of the first frame 20, so that the side flange 42 extends towards the axis of rotation AX more than the side flange 22 of the first frame 20.
- the membrane 30 has a second face 36 then in contact on the radial height (h) of the side flange 42 of the second frame 40, up to a internal end 43 of the second frame 40. Then the body 33 of the membrane 30 is free and extends in a curved manner in the direction X of the axis of rotation AX up to the second end 32 and the wear zone ZU.
- the internal end 43 of the second frame 40 is possibly curved in the direction X of the axis of rotation AX.
- the membrane 30 is not affected by wear at this internal end 43 and the body 33 of the membrane 30 more easily takes the desired curved shape, and determined by calculation and/or tests.
- this curved shape, the thickness, and the material of the membrane 30 determines a radial force that the membrane exerts concentrically towards the axis of rotation and on the rotating element 12.
- This radial force determines the correct contact of the wear zone ZU on the rotating element 12, and therefore the electrical conductivity of the ring and its capacity to maintain this conductivity in operation, ie during the rotation of the rotating element 12 and over the duration of functioning .
- the second armature 40 is also capable of conducting an electric current.
- the path of the electric current can pass between the membrane 30 and the first armature 20 as previously, but also between the membrane 30 and the second armature 40.
- the second armature 40 being mounted integral with the first armature 20, the another branch of the electric current passing through the second armature 40 then joins the first armature 20.
- This arrangement makes it possible to increase the electrically conductive area of the membrane 30 towards the first armature 20, this electrically conductive area being substantially the sum of a first area A 22 of direct contact between the membrane 30 and the first armature 20 (or area of the flange 22 of the first armature 22) and a second area A 42 of contact between the membrane 30 and the second armature 40 (or area of the flange 42 of the second frame).
- FIG 6 shows a particular example of application of the electrical balancing ring 10 previously described.
- This figure shows a rolling bearing 1 comprising on at least one side an electrical balancing ring 10 as described above in order to ensure the transfer of electrical charges.
- the rolling bearing is for example a rolling bearing of a motor vehicle, and more particularly for example a rolling bearing of a motor vehicle wheel, as shown in Figure 5.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rolling Contact Bearings (AREA)
- Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
- Sealing Of Bearings (AREA)
- Motor Or Generator Frames (AREA)
Abstract
Description
Claims
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/FR2022/051989 WO2024084134A1 (fr) | 2022-10-20 | 2022-10-20 | Anneau d'équilibrage électrique, et palier à roulement comprenant un tel anneau |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP4605660A1 true EP4605660A1 (fr) | 2025-08-27 |
Family
ID=85415128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP22862407.8A Pending EP4605660A1 (fr) | 2022-10-20 | 2022-10-20 | Anneau d'équilibrage électrique, et palier à roulement comprenant un tel anneau |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP4605660A1 (fr) |
| JP (1) | JP2025534608A (fr) |
| CN (1) | CN119998556A (fr) |
| WO (1) | WO2024084134A1 (fr) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202016009162U1 (de) | 2016-03-03 | 2023-06-29 | Kaco Gmbh + Co. Kg | Wellenerdungsring |
| DE102017009360A1 (de) * | 2017-10-06 | 2019-04-11 | Kaco Gmbh + Co. Kg | Wellenerdungsring sowie Ableitkörper für einen Wellenerdungsring |
| DE102019133877A1 (de) * | 2019-12-11 | 2021-06-17 | Schaeffler Technologies AG & Co. KG | Elektrische Antriebsanordnung mit einer Ableitvorrichtung mit integrierter Abriebschutzeinrichtung |
-
2022
- 2022-10-20 WO PCT/FR2022/051989 patent/WO2024084134A1/fr not_active Ceased
- 2022-10-20 EP EP22862407.8A patent/EP4605660A1/fr active Pending
- 2022-10-20 JP JP2025518990A patent/JP2025534608A/ja active Pending
- 2022-10-20 CN CN202280100659.7A patent/CN119998556A/zh active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| WO2024084134A1 (fr) | 2024-04-25 |
| JP2025534608A (ja) | 2025-10-17 |
| CN119998556A (zh) | 2025-05-13 |
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Legal Events
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| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
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| 17P | Request for examination filed |
Effective date: 20250410 |
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Free format text: CASE NUMBER: UPC_APP_0006097_4605660/2026 Effective date: 20260219 |