Bearing system including a ground brush assembly and associated assembly method

Abstract

Bearing system comprising a grounding brush assembly and associated assembly method. The bearing system (10) comprises a bearing (12) provided with an inner ring (16) and an outer ring (18) and a grounding brush assembly (14) comprising a brush (30) offset axially towards the outside with respect to the inner ring (16) of the bearing (12) and provided with a plurality of electrically conductive fibers (31) and a support (32) inside which the electrically conductive fibers (31) are mounted. The grounding brush assembly (14) further comprises a brush mounting plate (40) fixed to the support (32) of the brush (30) and comprising a mounting portion (46) configured inside a slot (24) formed in a hole (18b) of the outer ring (18) of the bearing (12).

Description

Technical Field

[0001] This invention relates to the general field of grounding devices for controlling shaft currents generated in electric motors or machines, and particularly to grounding brush assemblies. Background Technology

[0002] In an electric motor or electric machine, at least one rolling bearing is installed between the housing and the rotating shaft to support the shaft.

[0003] During operation, as the shaft rotates, a potential difference may occur between the shaft and the housing of an electric motor or electric machine, which generates a current between the inner ring (fixed to the shaft) and the outer ring (fixed to the housing) of the rolling bearing.

[0004] Current flowing through the components of a rolling bearing can damage these components, particularly the rolling elements and the raceways formed on the inner and outer rings. Discharge can also generate vibration.

[0005] To overcome these drawbacks, it is known to ground the rotating shaft by using an earthing brush or grounding brush that includes conductive fibers. The earthing brush is typically installed in a hole in the mount of the electric motor, such that the free end of the fiber is in radial contact with the outer surface of the rotating shaft.

[0006] Due to the conductivity of the fibers, the brush and the motor mount are kept at the same potential. The inner and outer rings of the rolling bearing are also at the same potential, which reduces or even eliminates problematic discharges through the rolling bearing.

[0007] Document US-A1-2021 / 0021180 discloses a grounding brush assembly, which includes a grounding brush, the grounding brush being provided with multiple conductive fibers, a support member in which the conductive fibers are installed, and an annular mounting plate. The annular mounting plate includes multiple radial and axial retaining tabs of the support member and an annular outer flange (flange) that radially surrounds the brush and the tabs.

[0008] A grounding brush assembly can also be installed on the outer surface of the outer ring of the rolling bearing.

[0009] However, using this solution may make it difficult to install the component between the electric motor's mount and the rotating shaft.

[0010] The present invention aims to overcome this shortcoming. Summary of the Invention

[0011] The present invention relates to a bearing system comprising a bearing having an inner ring and an outer ring rotatable relative to each other.

[0012] The system further includes a grounding brush assembly comprising a brush offset axially outward relative to the inner ring of the bearing and provided with multiple conductive fibers and a support, the conductive fibers being mounted inside the support. The conductive fibers preferably extend such that they project radially inward relative to the support.

[0013] The grounding brush assembly further includes a brush mounting plate fixed to a support member of the brush. The brush mounting plate includes a mounting portion disposed within a groove formed in a hole in the outer ring of the bearing. The groove is provided with a first lateral wall and a second lateral wall opposing each other in the axial direction, and an internal edge extending between the second lateral wall and the front surface of the outer ring.

[0014] The mounting portion of the mounting plate includes at least one retaining tab that abuts against a first lateral wall of the groove on one axial side and against a second lateral wall on the other side. The free end of the tab is radially offset outward relative to the inner edge of the groove to provide axial retention of the mounting plate relative to the outer ring.

[0015] With the mounting portion of the mounting plate fixed in the groove of the hole in the outer ring of the bearing, this design facilitates the installation of the system inside the housing of the associated electric motor.

[0016] The retaining tabs in the mounting portion of the mounting plate provide a simple and economical way to secure the component relative to the outer ring of the bearing.

[0017] In one embodiment, the retaining tab of the mounting portion of the mounting plate is flat.

[0018] Advantageously, the retaining tabs of the mounting portion of the mounting plate extend obliquely outward. The axial retention of the retaining tabs is increased by a bracing effect.

[0019] In one embodiment, the mounting portion of the mounting plate further includes at least one flange abutting axially against a first lateral wall of the groove, the free end of the flange being radially offset inward relative to the inner edge of the groove, or the free end of the flange contacting the inner edge, the retaining tab being circumferentially offset relative to the flange.

[0020] The circumferential dimension of the flange can be larger than the circumferential dimension of the tab.

[0021] In one embodiment, the flange of the mounting portion of the mounting plate is kept at a certain distance from the second lateral wall of the groove.

[0022] In one particular embodiment, the mounting portion of the mounting plate includes at least two radial flanges abutting axially against a first lateral wall of the groove and at least two retaining tabs, each of the retaining tabs being located circumferentially between the radial flanges.

[0023] The mounting plate is preferably manufactured as a single piece.

[0024] The present invention also relates to an electric motor comprising a housing, a shaft, and at least one bearing system according to any of the above embodiments, the at least one bearing system being radially mounted between the housing and the shaft.

[0025] The present invention also relates to a method for assembling a bearing system according to any one of the above embodiments, the assembly method comprising the following steps:

[0026] Before mounting the grounding brush assembly onto the bearing, the retaining tab of the mounting portion of the mounting plate is axially bent (folded) on the side opposite to the brush, such that the outer diameter of the mounting plate defined by the tab is smaller than the inner diameter of the inner edge of the groove of the outer ring of the bearing.

[0027] - The grounding brush assembly is axially displaced relative to the bearing so that the deformed retaining tab of the mounting portion of the mounting plate axially abuts against the first lateral wall of the groove of the outer ring of the bearing. During this relative displacement, the free end of the retaining tab remains radially at a distance from the inner edge of the groove.

[0028] - Deform the retaining tab so that the retaining tab presses against the first lateral wall of the groove of the outer ring of the bearing, and cause the free end of the retaining tab to be radially offset outward relative to the inner edge of the groove. Attached Figure Description

[0029] The invention will be more clearly understood by studying the detailed description of the embodiments provided by way of non-limiting example and illustrated in the accompanying drawings, in which:

[0030] Figure 1 This is a perspective view of a bearing system according to an exemplary embodiment of the present invention.

[0031] Figure 2 yes Figure 1 A front view of the bearing system.

[0032] Figure 3 It is along Figure 2 Half-section view of axis III-III,

[0033] Figure 4 It is along Figure 2 Half-section view of axis IV-IV,

[0034] Figure 5 yes Figure 4 Detailed images,

[0035] Figure 6 It is along Figure 4 A cross-sectional view of axis VI-VI.

[0036] Figure 7 and Figure 8 yes Figure 1 A 3D view of the grounding brush assembly of the bearing system.

[0037] Figure 9 During the assembly of the grounding brush assembly with the bearing system, along Figure 2 Half-section view of axis III-III,

[0038] Figure 10 During the assembly of the grounding brush assembly with the bearing system, along Figure 2 Half-section view of axis IV-IV, and

[0039] Figure 11 It is shown schematically. Figure 1 A half-section view of the bearing system installed inside the housing of the electric motor. Detailed Implementation

[0040] Figures 1 to 4The bearing system shown in the figure, and generally marked by 10, is designed to be mounted radially between the seat of an electric motor or electric machine and the rotating shaft.

[0041] The bearing system 10 includes a bearing 12 and a grounding brush assembly 14 mounted on the bearing 12.

[0042] Bearing 12 is provided with an inner ring 16 and a second outer ring 18 that are rotatable relative to each other about an axis (not shown) of bearing 12. The inner ring 16 and the outer ring 18 of bearing 12 are concentric and extend axially along the axis of bearing 12. The inner ring 16 and the outer ring 18 are made of steel. The rings are solid.

[0043] In the exemplary embodiment shown, the bearing 12 further includes a row of rolling elements 20 (balls in this case) radially positioned between the inner ring 16 and the outer ring 18. The bearing 12 also includes a cage 22 for maintaining a regular circumferential spacing of the rolling elements 20.

[0044] The inner ring 16 includes a cylindrical bore 16a, an axially cylindrical outer surface 16b radially opposite the bore 16a, and a first front face 16c and a second front face 16d radially opposite each other defining the bore 16a and the outer surface 16b. The bore 16a and the outer surface 16b define the radial thickness of the inner ring 16. The front faces 16c and 16d define the axial length of the inner ring 16.

[0045] The outer ring 18 includes an axially cylindrical outer surface 18a, a cylindrical hole 18b radially opposite to the outer surface 18a, and a first face 18c and a second face 18d radially opposite to the hole 18b and the outer surface 18a, which define the outer ring 18 in the axial direction. The outer surface 18a and the hole 18b define the radial thickness of the outer ring 18. Faces 18c and 18d define the axial length of the outer ring 18.

[0046] The outer ring 18 also includes a first annular groove 24 and a second annular groove 26 formed on the hole 18b and extending radially outward. Each groove 24, 26 is oriented radially on one side of the inner ring 16.

[0047] Grooves 24 and 26 are axially arranged on either side of the row of rolling elements 20. Groove 24 is axially located near the front face 18c of the outer ring 18, and groove 26 is axially located near the front face 18d. Grooves 24 and 26 are symmetrical to each other with respect to the radial midplane of the bearing system. Alternatively, the outer ring 18 may consist only of groove 24.

[0048] As will be described in more detail below, the grounding brush assembly 14 is fixed in a groove 24 of the outer ring 18 of the bearing 12. Assembly 14 has an overall annular shape. Assembly 14 includes a grounding brush 30 and a brush mounting plate 40, which is configured to radially center the brush 30. The mounting plate 40 is fixed in the groove 24 of the outer ring 18 of the bearing 12.

[0049] The brush 30 is axially offset outward relative to the inner ring 16 of the bearing 12. In other words, the brush 30 is axially spaced from the inner ring 16 of the bearing 12. The brush 30 is positioned on the outer side of the bearing 12.

[0050] The brush 30 comprises multiple individual conductive fibers 31 designed to rotate around the axis of rotation of the motor. The conductive fibers 31 can be made of carbon, stainless steel, conductive plastics (such as acrylic fibers), or nylon. Figure 1 , Figure 2 , Figure 7 and Figure 8 The conductive fiber 31 is schematically shown in the diagram.

[0051] The brush 30 also includes a retaining member or support 32, within which conductive fibers 31 are mounted. The conductive fibers 31 extend radially inward relative to the support 32.

[0052] In the exemplary embodiment shown, the support 32 is in the form of an open ring. The support 32 is made of a rigid material. The support 32 can be manufactured by cutting and stamping. The support 32 is made of a conductive material (such as aluminum, stainless steel, bronze, copper, or other materials). Alternatively, the support 32 can be made of a non-conductive material with a conductive coating or paint.

[0053] The brush 30 preferably also includes a ring 33, around which conductive fibers 31 are disposed inside the support member 32. The ring 33 serves to support the conductive fibers 31. The ring 33 is installed inside the support member 32.

[0054] The support 32 of brush 30 includes an axial mounting portion 34 and two opposing lateral flanks 36, 38, which extend inward from the mounting portion 34 and axially grip conductive fibers 31. The conductive fibers 31 are supported against the lateral flanks 36, 38 on either side in the axial direction. The conductive fibers 31 are also supported against the mounting portion 34 radially. The conductive fibers 31 extend radially inward relative to the lateral flanks 36, 38 of the support 32.

[0055] Mounting portion 34 and two lateral sides 36, 38 define a channel that opens radially inward, and conductive fiber 31 is partially located inside the channel.

[0056] Lateral side 36 extends from one end of mounting portion 34, and lateral side 38 extends from the opposite end of mounting portion 34. Lateral sides 36 and 38 extend obliquely inward from mounting portion 34. Lateral sides 36 and 38 are symmetrical to each other with respect to the radial midplane of support member 32. Alternatively, only one of lateral sides 36 and 38 may extend obliquely inward. In another variation, both lateral sides 36 and 38 may extend radially. Here, mounting portion 34 extends axially. Alternatively, mounting portion 34 may extend obliquely.

[0057] Brush 30 is in the form of an open ring. This allows brush 30 to fit (or adapt to) different diameters of the motor shaft. Generally, the ends of brush 30 are not fixed to each other. As a variation, these ends of brush 30 can still be fixed to each other.

[0058] The conductive fiber 31 has a distal free end, which is designed to make radial contact with the outer surface of the rotating shaft of the motor. The free end of the conductive fiber 31 defines the inner diameter of the conductive fiber 31, and more generally defines the inner diameter of the brush 30.

[0059] In the exemplary embodiment shown, the free end of the conductive fiber 31 is radially offset inward relative to the bore 16a of the inner ring 16 of the bearing 12. In other words, the free end of the conductive fiber 31 protrudes radially relative to the bore 16a of the inner ring 16. Alternatively, the free end of the conductive fiber 31 may contact the bore 16a radially. In another alternative, if the bearing system also includes a sleeve mounted in the bore 16a of the inner ring 16, the free end of the conductive fiber 31 may be radially set back relative to the bore 16a.

[0060] The mounting plate 40 of the grounding brush assembly 14 includes an annular radial portion 42 and a plurality of axial and radial retaining tabs 44 extending from the radial portion 42 to the brush 30.

[0061] Mounting plate 40 also includes mounting portion 46 and connecting portion 48. Mounting portion 46 is disposed in groove 24 of outer ring 18 of bearing 12, and connecting portion 48 connects mounting portion 46 to radial portion 42.

[0062] The radial portion 42 of the mounting plate 40 abuts axially against the support 32 of the brush 30. More specifically, the mounting portion 42 abuts axially against the lateral side 36 of the support 32. The radial portion 42 is offset axially outward relative to the inner ring 16 of the bearing. The radial portion 42 is maintained at a distance axially from the front face 16c of the inner ring 16. The support 32 of the brush 30 abuts axially against the radial portion 42 on the side axially opposite to the inner ring 16. Alternatively, depending on the design of the mounting plate 40, the support 32 of the brush 30 may abut axially against the radial portion 42 on the axial side of the inner ring 16. In this case, the support 32 is axially positioned between the radial portion 42 and the face 16c of the mounting plate 40 by maintaining an axial distance from the face 16c of the inner ring 16.

[0063] The tabs 44 of the mounting plate are spaced apart from each other in the circumferential direction. In this case, the tabs 44 of the mounting plate are spaced apart from each other in a regular (or equal) manner in the circumferential direction. Alternatively, an irregular circumferential spacing can be provided. In the exemplary embodiment shown, the number of tabs 44 is six. Alternatively, a larger or smaller number of tabs 44 can be provided. Two tabs 44 or at least four tabs can be provided. Preferably, the number of tabs 44 is at least equal to two.

[0064] Each tab 44 extends to project axially relative to the radial portion 42. Each tab 44 partially surrounds the support 32 of the brush 30 radially and radially contacts the mounting portion 34 of the support 32. The support 32 is held by the tabs 44 to abut axially against the radial portion 42 of the mounting plate 40. The tabs 44 allow for axial and radial retention of the ground brush 30. Lateral side 36 of the support 32 abuts against the radial portion 42 of the mounting plate 40, and lateral side 38 abuts against the tabs 44. In this case, the tabs 44 are identical to each other.

[0065] Each tab 44 has an axial portion and a radially inwardly bent portion. The axial portion extends axially from the radial portion 42, partially surrounds the support 32 radially, and radially contacts the support 32. The radially inwardly bent portion is located at the free end of the axial portion. The bent portion of each tab 44 allows the support 32 of the grounding brush 30 to be held axially. The folded portion of each tab 44 is in axial contact with the lateral flank 38 of the support 32.

[0066] The connecting portion 48 of the mounting plate is annular and extends axially. The connecting portion 48 extends axially between the large-diameter edge of the radial portion 42 and the small-diameter edge of the mounting portion 46. The mounting portion 46 is radially offset outward relative to the tab 44 and axially offset inward relative to the tab 44 towards the bearing 12.

[0067] As in Figures 3 to 8 As shown more clearly, the mounting portion 46 of the mounting plate includes axially retaining tabs 49a and flanges 49b. The tabs 49a are spaced apart from each other in the circumferential direction; in this case, the tabs 49a are spaced apart from each other in a regular manner in the circumferential direction. Alternatively, irregular circumferential spacing of the tabs 49a may be provided. In the exemplary embodiment shown, the number of tabs 49a is six. Alternatively, more or even fewer tabs 49a may be provided. A single tab 49a or at least two or four tabs may be provided. Preferably, the number of tabs 49a is at least two. Here, the tabs 49a are identical to each other. Alternatively, the tabs 49a may have different circumferential dimensions.

[0068] Each tab 49a is circumferentially positioned between two consecutive flanges 49b of the mounting portion 46. The flanges 49b are regularly spaced apart from each other in the circumferential direction. Alternatively, irregular circumferential spacing of the flanges 49b may be provided. In the exemplary embodiment shown, the number of tabs 49a is the same as the number of flanges 49b. Alternatively, the number of tabs 49a and flanges 49b may be different. Here, the flanges 49b are identical to each other. Alternatively, the flanges 49b may have different circumferential dimensions.

[0069] The circumferential dimension of flange 49b is larger than the circumferential dimension of tab 49a. For example, in Figure 3 , Figure 4 , Figure 9 , Figure 10 and Figure 11 As shown, the protrusion 49a is kept flat.

[0070] Each tab 49a extends radially outward from the edge of the connecting portion 48 of the mounting plate opposite the radial portion 42 in the axial direction. Each tab 49a is disposed in a groove 24 of the outer ring of the bearing.

[0071] As in Figure 5As shown more clearly in the diagram, the groove 24 is provided with a first lateral wall 24a and a second lateral wall 24b, or axially opposite sides. The first lateral wall 24a and the second lateral wall 24b are connected by a base (not shown) oriented radially inward. In this case, the base is concave. Alternatively, the base may have a different profile, such as a flat profile. In another variation, the groove 24 may not have a base. In this case, the lateral walls 24a and 24b are connected to each other.

[0072] The groove 24 is also provided with an inner edge 24c, which extends from the small-diameter end of the second lateral wall 24b and connects to the front surface 18c of the outer ring. The edge 24c extends between the second lateral wall 24b and the front surface 18c, connecting the second lateral wall 24b and the front surface 18c. The edge 24c is radially offset inward relative to the base. The groove 24 has a stepped shape. The second lateral wall 24b has a radially reduced dimension relative to the first lateral wall 24a.

[0073] Each tab 49a is flat and extends obliquely outward. Each tab 49a abuts against a first lateral wall 24a of the groove on one axial side and against a second lateral wall 24b on the other side. Each tab 49a abuts a majority of the first lateral wall 24a of the groove axially. The free end of each tab 49a abuts against the second lateral wall 24b axially. The free end of each tab 49a is radially offset outward relative to the inner edge 24c of the groove. Each tab 49a provides axial retention of the mounting plate 40 relative to the outer ring 18. The axial retention of the mounting plate 40 relative to the outer ring 18 is provided by diametrical interference between the tab 49a and the second lateral wall 24b of the groove. The outer diameter of the tab 49a is larger than the inner diameter of the inner edge 24c of the groove. The outer diameter of the tab 49a of the mounting portion 46 defines the outer diameter of the mounting plate 40.

[0074] Each flange 49b extends radially outward from the edge of the connecting portion 48 of the mounting plate opposite the radial portion 42 in the axial direction. Each flange 49b is disposed in a groove 24 of the outer ring of the bearing. Each flange 49a is flat and extends obliquely outward. Each flange 49b abuts axially against a first lateral wall 24a of the groove. There is no axial contact between the flange 49b and the second lateral wall 24b of the groove. In other words, the flange 49b is maintained at a distance from the second lateral wall 24b of the groove. Each flange 49b abuts a majority of the first lateral wall 24a of the groove in the axial direction. The free end of each flange 49b is radially offset inward relative to the inner edge 24c of the groove. The outer diameter of the flange 49b is smaller than the outer diameter of the tab 49a and the inner diameter of the inner edge 24c of the groove.

[0075] A plurality of through openings 50 are formed in the thickness of the radial portion 42 and the connecting portion 48 of the mounting plate 40. The openings 50 are formed during partial cutting of the mounting plate 40 to form tabs 44. The tabs 44 are formed by cutting, bending, and crimping the mounting plate 40. The openings 50 are spaced apart from each other in the circumferential direction. Each tab 44 is aligned with its associated opening 50 in the circumferential direction. The number of openings 50 corresponds to the number of tabs 44. (As shown in...) Figure 8 As can be seen, the root of each tab 44 extends from the inner edge of the associated opening 50 located on the radial portion 42.

[0076] Mounting plate 40 is manufactured by cutting and stamping. Mounting plate 40 is made of a conductive material (such as aluminum, stainless steel, bronze, copper, or other materials). Alternatively, mounting plate 40 can be made of a non-conductive material with a conductive coating or conductive paint ( / conductive varnish). In this case, mounting plate 40 is manufactured as a single piece.

[0077] To assemble the bearing system 10, the method is performed as follows.

[0078] In the first step, after manufacturing the grounding brush assembly 14 and before mounting the grounding brush assembly 14 onto the bearing 12, the tabs 49a of the mounting plate are axially deformed by bending (folding) on ​​the side opposite to the brush 30, as shown. Figure 10 As shown. The tab 49a is bent toward the outer ring 18 of the bearing. The tab 49b extends obliquely toward the outer ring 18. The tab 49a is bent such that the outer diameter of the tab 49a is smaller than the inner diameter of the inner edge 24c of the groove in the outer ring.

[0079] Then, in the second step, the grounding brush assembly 14 is axially displaced relative to the bearing 12 so that the deformed tab 49a is axially supported against the first lateral wall 24a of the groove 24 of the outer ring. During this relative displacement, the free end of the tab 49b remains radially at a distance from the inner edge 24c of the groove of the outer ring. In other words, the free end of the tab 49a does not return to an interference fit with the inner edge 24c of the groove.

[0080] Finally, in the third and final steps, an axial force is applied to the tabs 49a, causing them to deform and flatten against the first lateral wall 24a of the groove 24, as... Figure 4 As shown. After this deformation, the free end of the tab 49a is offset radially outward relative to the inner edge 24c of the groove in the outer ring. In this way, the tab 49a is fixed to the inner side of the groove 24 in the outer ring.

[0081] like Figure 11 As shown, the brush system 10 can be installed inside the hole of the associated electric motor housing 52 and on the motor's rotating shaft 54. The bearing 12 is radially mounted between the hole of the motor housing 52 and the rotating shaft 54.

[0082] During the operation of the electric motor, the charge accumulated on the shaft 54 ​​is discharged toward the seat 52 through the conductive fiber 31, the support 32 of the brush 30, and the mounting plate 40 of the assembly 14.

Claims

1. A bearing system (10) comprising a bearing (12) and a grounding brush assembly (14), the bearing (12) having an inner ring (16) and an outer ring (18) rotatable relative to each other, the grounding brush assembly (14) comprising a brush (30) axially offset outward relative to the inner ring (16) of the bearing (12) and having a plurality of conductive fibers (31) and a support (32), the conductive fibers (31) being mounted inside the support (32), characterized in that, The grounding brush assembly (14) further includes a brush mounting plate (40), which is fixed to the support (32) of the brush (30) and includes a mounting portion (46). The mounting portion (46) is disposed inside a groove (24) formed in a hole (18b) in the outer ring (18) of the bearing (12). The groove (24) is provided with a first lateral wall (24a) and a second lateral wall (24b) that are axially opposed, and the second lateral wall (24b) is positioned relative to the front surface (18c) of the outer ring. The inner edge (24c) of the groove (24) extends between the grooves, and the mounting portion (46) of the mounting plate includes at least one retaining tab (49a) that abuts against a first lateral wall (24a) of the groove (24) on one side and against a second lateral wall (24b) on the other side. The free end of the tab (49a) is radially offset outward relative to the inner edge (24c) of the groove to provide axial retention of the mounting plate (40) relative to the outer ring (18).

2. The system according to claim 1, characterized in that, The retaining tab (49a) of the mounting portion (46) of the mounting plate (40) is flat.

3. The system according to claim 1 or 2, characterized in that, The retaining tab (49a) of the mounting portion (46) of the mounting plate (40) extends obliquely outward.

4. The system according to any one of the preceding claims, characterized in that, The mounting portion (46) of the mounting plate (40) further includes at least one flange (49b) abutting axially against a first lateral wall (24a) of the groove (24), the free end of the flange (49b) being radially offset inward relative to the inner edge (24c) of the groove, or the free end of the flange (49b) contacting the inner edge, the retaining tab (49a) being offset circumferentially relative to the flange (49b).

5. The system according to claim 4, characterized in that, The circumferential dimension of the flange (49b) is greater than the circumferential dimension of the tab (49a).

6. The system according to claim 4 or 5, characterized in that, The flange (49b) of the mounting portion (46) of the mounting plate (40) remains at a certain distance from the second side wall (24b) of the groove (24).

7. The system according to any one of claims 4 to 6, characterized in that, The mounting portion (46) of the mounting plate (40) includes at least two flanges (49b) abutting axially against a first lateral wall (24a) of the groove (24) and at least two retaining tabs (49a), each of the retaining tabs (49a) being located circumferentially between the radial flanges (49b).

8. The system according to any one of the preceding claims, characterized in that, The mounting plate (40) is manufactured as a single piece.

9. An electric motor comprising a housing (52), a shaft (54), and at least one bearing system (10) according to any one of claims 1 to 8, the at least one bearing system (10) being radially mounted between the housing (52) and the shaft (54).

10. A method for assembling a bearing system (10) according to any one of claims 1 to 8, comprising the following steps: Before mounting the grounding brush assembly (14) onto the bearing, the retaining tab (49a) of the mounting portion (46) of the mounting plate is bent axially on the side opposite to the brush (30), such that the outer diameter of the mounting plate defined by the tab is smaller than the inner diameter of the inner edge (24c) of the groove of the outer ring of the bearing. - The grounding brush assembly (14) is axially displaced relative to the bearing (12) such that the deformed retaining tab (49a) of the mounting portion (46) of the mounting plate axially abuts against the first lateral wall (24a) of the groove (24) of the outer ring of the bearing. During this relative displacement, the free end of the retaining tab (49a) remains radially distanced from the inner edge (24c) of the groove. - Deform the retaining tab (49a) so that the retaining tab (49a) presses against the first lateral wall (24a) of the groove of the outer ring of the bearing, and cause the free end of the retaining tab (49a) to be radially offset outward relative to the inner edge (24c) of the groove.

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