Bearing system including a ground brush assembly and associated assembly method

Abstract

Bearing system including a grounding brush assembly and associated method of assembly. The bearing system (10) includes a bearing (12) provided with an inner race (16) and an outer race (18) and a grounding brush assembly (14) including a brush (30) offset axially outwardly relative to the inner race (16) of the bearing (12) and provided with a plurality of electrically conductive fibers (31) mounted in a support (32). The grounding brush assembly (14) further includes a brush mounting plate (40) secured to the support (32) of the brush (30) and including a mounting portion (46) configured to be inside a slot (24) formed in a bore (18b) of the outer race (18) of the bearing (12).

Description

Technical Field

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

[0002] In an electric motor or electrical machine, at least one rolling bearing is installed between the motor housing or the housing of the electric machine 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 motor mount or the mount of the electric machine, thereby generating a current between the inner ring (fixed to the shaft) and the outer ring (fixed to the mount) 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 in the prior art to use an earthing brush (or grounding brush) comprising conductive fibers to ground the rotating shaft. The earthing brush is typically mounted in a hole in the motor mount, such that the free end of the fiber makes radial contact with the outer surface of the rotating shaft.

[0006] Thanks to the conductivity of the fibers, the brush and the motor housing are kept at the same potential. The inner and outer rings of the rolling bearing are also at the same potential, thus reducing or even eliminating problematic discharges through the rolling bearing.

[0007] Document US-A1-2021 / 0021180 discloses a grounding brush assembly, which includes a grounding brush, a support, and an annular mounting plate. The grounding brush is provided with multiple conductive fibers, which are installed inside the support. The annular mounting plate includes multiple tabs for radially and axially retaining the support, and an outer annular flange surrounding the brush and tabs in the radial direction.

[0008] Alternatively, the outer surface of the outer ring of the rolling bearing can be equipped with a grounding brush assembly.

[0009] However, using this solution, installing the component between the electric motor's mount and the rotating shaft may be difficult to perform.

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

[0011] The present invention relates to a bearing system comprising bearings having a first and a second ring configured to rotate relative to each other.

[0012] The system also 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 in the support. Preferably, the conductive fibers protrude 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 mounting plate includes a mounting portion disposed within a groove formed in a hole in the outer ring of the bearing. The groove has a first lateral wall and a second lateral wall facing each other axially, a bottom connecting the first and second lateral walls, and an inner edge extending between the second lateral wall and an end face of the outer ring.

[0014] According to a general feature, the mounting portion of the mounting plate includes at least one collar that axially supports against a first lateral wall of the groove. The free end of the collar is radially offset inward relative to or flush with the inner edge of the groove.

[0015] According to another general feature, the mounting portion of the mounting plate includes at least one protrusion that projects outwardly from the collar toward the bottom of the groove. The free end of the protrusion is offset radially outward relative to the inner edge of the groove to ensure axial retention of the mounting plate relative to the outer ring.

[0016] According to another general feature, the collar of the mounting portion of the mounting plate locally has at least one axial thickness reduction region that is axially thinner relative to the remainder of the collar, which is located in the radial extension of the protrusion.

[0017] This design facilitates the installation of the system inside the associated electric motor housing to the extent that the mounting portion of the mounting plate is fixed in the groove of the bore in the outer ring of the bearing.

[0018] The protrusions on the mounting portion of the mounting plate ensure that the assembly is secured relative to the outer ring of the bearing in a simple and economical manner. Advantageously, the protrusions are formed by localized deformation of the collar material (e.g., by shot peening).

[0019] The mounting portion of the mounting plate may have at least one blind notch formed in the collar, the at least one blind notch being oriented outward in the axial direction and defining the axial thickness reduction region.

[0020] Preferably, the protrusion of the mounting portion of the mounting plate radially supports the bottom of the groove that abuts against the outer ring of the bearing. Alternatively, the protrusion may be radially spaced from the bottom of the groove.

[0021] In one embodiment, the mounting portion of the mounting plate includes a plurality of protrusions, each protruding outwardly from the collar toward the bottom of the groove and spaced apart from each other in the circumferential direction. The free end of each protrusion is radially offset outward relative to the inner edge of the groove. The collar locally has a plurality of axially reduced thickness regions, each located in a radial extension of one of the protrusions, with the axial thickness decreasing relative to the rest of the collar. The protrusions may be regularly (or equally) spaced apart from each other in the circumferential direction.

[0022] In one embodiment, the collar of the mounting portion of the mounting plate remains spaced apart from the second lateral wall of the groove of the outer ring of the bearing.

[0023] According to a particular design, the collar of the mounting portion of the mounting plate is annular. Alternatively, the collar may extend over an angular sector of less than 360°. In another embodiment, the mounting portion of the mounting plate may include a plurality of collars that axially bear against a first lateral wall of a groove in the outer ring and are spaced apart from each other in the circumferential direction. In this case, each collar, some collars, or a single collar may be provided with at least one protrusion.

[0024] Preferably, the mounting plate is manufactured as a single piece.

[0025] The present invention also relates to an electric motor comprising a housing, a shaft, and at least one bearing system as defined above, the at least one bearing system being radially mounted between the housing and the shaft.

[0026] The present invention also relates to a method for assembling a bearing system as defined above, the method comprising the following steps:

[0027] - Displace the grounding brush assembly axially relative to the bearing so that the collar of the mounting portion of the mounting plate axially supports against the first lateral wall of the groove of the outer ring of the bearing, then

[0028] - The radial flow of the material causes localized deformation of the collar material to form the protrusion. Attached Figure Description

[0029] The invention will be better understood by studying a detailed description of one embodiment given only 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 The front view of the bearing system in the image.

[0032] Figure 3 It is along Figure 2 A half-section view taken from axis III-III in the middle.

[0033] Figure 4 It is along Figure 2 A half-section view taken from axis IV-IV in the middle.

[0034] Figure 5 It is along Figure 4 A cross-sectional view taken from the axis VV in the middle.

[0035] Figure 6 yes Figure 5 Detailed images,

[0036] Figure 7 yes Figure 4 Detailed images,

[0037] Figure 8 yes Figure 2 Detailed images,

[0038] Figure 9 and Figure 10 yes Figure 1 A perspective view of the grounding brush assembly of the bearing system before it is assembled with the bearing of the system.

[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] exist Figures 1 to 4 The bearing system shown in the figure and generally indicated by reference numeral 10 is designed to be mounted radially between the rotating shaft of an electric motor or electric machine and its housing.

[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 configured to rotate relative to each other about an axis (not shown) of bearing 12. The inner ring 16 and outer ring 18 of bearing 12 are concentric and extend axially along the axis of bearing 12. The inner ring 16 and 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, a radially opposite cylindrical axial outer surface 16b to the bore 16a, and opposing first radial end faces 16c and second radial end faces 16d that define the bore 16a and the outer surface 16b in the axial direction. The bore 16a and the outer surface 16b define the radial thickness of the inner ring 16. The end faces 16c and 16d define the axial length of the inner ring 16.

[0045] The outer ring 18 includes a cylindrical axial outer surface 18a, a cylindrical bore 18b radially opposite to the outer surface 18a, and opposing first radial end faces 18c and second radial end faces 18d defining the bore 18b and the outer surface 18a axially. The outer surface 18a and the bore 18b define the radial thickness of the outer ring 18. The end 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 in the hole 18b and extending radially outward. Each groove 24, 26 is radially oriented toward the inner ring 16.

[0047] Grooves 24 and 26 are axially positioned on either side of the row of rolling elements 20. Groove 24 is axially located near end face 18c of the outer ring 18, and groove 26 is axially located near end face 18d. Grooves 24 and 26 are symmetrical with respect to the median radial plane 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 a generally 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 offset axially from 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 includes multiple individual conductive fibers 31 designed to be arranged around the rotating shaft of the motor. The conductive fibers 31 can be made of carbon, stainless steel, or conductive plastics such as acrylic fiber or nylon. Figure 1 , Figure 2 , Figure 9 and Figure 10 It is shown schematically in the diagram.

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

[0052] In the exemplary embodiment shown, the support member 32 is in the form of an open ring. The support member 32 is made of a rigid material. The support member 32 may be manufactured by cutting and stamping. The support member 32 is made of a conductive material (such as aluminum, stainless steel, bronze, copper, or another material). Alternatively, the support member 32 may 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 32. The ring 33 performs the function of supporting the conductive fibers 31. The ring 33 is mounted inside the support 32.

[0054] The support 32 of the brush 30 includes an axial mounting portion 34 and two opposing lateral flanks 36, 38 extending inward from the mounting portion 34 and axially surrounding the conductive fiber 31. The conductive fiber 31 is supported on either side of the lateral flanks 36, 38. The conductive fiber 31 is also supported radially against the mounting portion 34. The conductive fiber 31 protrudes 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 with a radially inward opening, within which conductive fiber 31 is partially located.

[0056] Lateral flank 36 extends from one end of mounting portion 34, and lateral flank 38 extends from the opposite end of mounting portion 34. Lateral flanks 36 and 38 extend inwardly at an angle from mounting portion 34. Lateral flanks 36 and 38 are symmetrical with respect to the intermediate radial plane of support member 32. Alternatively, only one of lateral flanks 36 and 38 may extend inwardly at an angle. In another variation, both lateral flanks 36 and 38 may extend radially. Mounting portion 34 extends axially here. Alternatively, mounting portion 34 may extend at an angle.

[0057] Brush 30 is in the form of an open ring. This allows brush 30 to accommodate different diameters of the motor shaft. Generally, the ends of brush 30 are not fixed to each other. As a variation, it is still possible to fix the ends of brush 30 to each other.

[0058] The conductive fiber 31 has distal free ends that are designed to make radial contact with the outer surface of the rotating shaft of the motor. The distal free ends of the conductive fiber 31 define the inner diameter of the conductive fiber 31, and more generally define the inner diameter of the brush 30.

[0059] In the exemplary embodiment shown, the free ends of the conductive fiber 31 are radially offset inward relative to the bore 16a of the inner ring 16 of the bearing 12. In other words, the free ends of the conductive fiber 31 protrude radially relative to the bore 16a of the inner ring 16. Alternatively, the free ends of the conductive fiber 31 may be radially flush with the bore 16a. In another alternative, if the bearing system also includes a sleeve mounted in the bore 16a of the inner ring 16, the free ends 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 tabs 44 extending from the radial portion 42 for axial and radial retention of the brush 30.

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

[0062] The radial portion 42 of the mounting plate 40 axially supports the support member 32 of the brush 30. More specifically, the radial portion 42 axially supports the lateral side 36 of the support member 32. The radial portion 42 is axially offset outward relative to the inner ring 16 of the bearing. The radial portion 42 remains axially spaced from the end face 16c of the inner ring 16. The support member 32 of the brush 30 axially supports the radial portion 42 on the side opposite to the inner ring 16. Alternatively, depending on the design of the mounting plate 40, the support member 32 of the brush 30 may axially support the radial portion 42 on the side facing the inner ring 16. In this case, the support member 32 is axially positioned between the radial portion 42 of the mounting plate 40 and the face 16c of the inner ring 16, while remaining axially spaced from said face 16c.

[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 two.

[0064] Each tab 44 protrudes axially relative to the radial portion 42. Each tab 44 partially surrounds the support 32 of the brush 30 radially and is in radial contact with the mounting portion 34 of the support 32. The support 32 is held axially against the radial portion 42 of the mounting plate 40 by the tabs 44. The tabs 44 allow the ground brush 30 to be held axially and radially. Lateral side 36 of the support 32 supports against the radial portion 42 of the mounting plate 40, and lateral side 38 supports against the tabs 44. Here, 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 bent portion of each tab 44 is in axial contact with the lateral side 38 of the support 32.

[0066] The connecting portion 48 of the mounting plate is annular and extends axially. The connecting portion 48 extends radially 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 outwardly offset relative to the tab 44 and axially inwardly offset relative to the tab 44 toward the bearing 12.

[0067] like Figures 3 to 8 As shown more clearly in the diagram, the mounting portion 46 of the mounting plate includes an annular collar 49 that projects radially outward from the connecting portion 48 of the mounting plate. The collar 49 is disposed in a groove 24 of the outer ring of the bearing.

[0068] like Figure 7 As shown more clearly, the groove 24 is provided with a first lateral wall 24a or sidewall ( / flank) and a second lateral wall 24b or sidewall facing each other axially. The first lateral wall 24a and the second lateral wall 24b are connected by a bottom 24c oriented radially inward. In this case, the bottom 24c is concave. Alternatively, the bottom 24c may have other contours, such as being flat. In another variation, the groove 24 may not have a bottom 24c. In this case, the lateral walls 24a, 24b are connected to each other.

[0069] The groove 24 is also provided with an inner edge 24d, which extends from the small-diameter end of the second lateral wall 24b and engages the end face 18c of the outer ring. The edge 24d extends between the second lateral wall 24b and the end face 18c and connects the second lateral wall 24b and the end face 18c. The edge 24d is radially offset inward relative to the bottom 24c. The groove 24 has a stepped shape. The second lateral wall 24b has a radial dimension that is reduced relative to the first lateral wall 24a.

[0070] The collar 49 protrudes radially outward from the edge of the connecting portion 48 of the mounting plate that is axially opposite to the radial portion 42. The collar 49 is flat. The collar 49 axially supports the first lateral wall 24a of the groove abutting the outer ring of the bearing. There is no axial contact between the collar 49 and the second lateral wall 24b of the groove. In other words, the collar 49 remains spaced apart from the second lateral wall 24b of the groove. The collar 49 axially supports the main portion abutting the first lateral wall 24a of the groove. The free end of the collar 49 is radially offset inward relative to the inner edge 24d of the groove. The outer diameter of the collar 49 is smaller than the inner diameter of the inner edge 24d of the groove. Alternatively, the outer diameter of the collar 49 may be equal to the inner diameter of the inner edge 24d of the groove.

[0071] The mounting portion 46 of the mounting plate also includes a plurality of protrusions 50 projecting outward from the collar 49 toward the bottom 24c of the groove. Each protrusion 50 projects outward from the outer periphery of the collar 49. The outer diameter of the protrusion 50 is larger than the outer diameter of the collar 49. The outer diameter of the protrusion 50 defines the outer diameter of the mounting plate.

[0072] The protrusions 50 are spaced apart from each other in the circumferential direction. In this case, the protrusions 50 are spaced apart from each other in a regular (or equal) manner in the circumferential direction. Alternatively, the protrusions 50 may be provided with irregular circumferential spacing. In the exemplary embodiment shown, the number of protrusions 50 is six. Alternatively, a larger or smaller number of protrusions 50 may be provided. A single protrusion 50 may be provided, or at least two or four protrusions 50 may be provided. Preferably, the number of protrusions 50 is at least two. In this case, the protrusions 50 are identical to each other. Alternatively, the protrusions 50 may have different dimensions, and for example, different circumferential dimensions.

[0073] Each protrusion 50 is axially supported on one side against a first lateral wall 24a of the groove of the outer ring, and on the other side against a second lateral wall 24b. Each protrusion 50 conforms to the shape of the bottom 24c of the groove. The free end of each protrusion 50 is radially offset outward relative to the inner edge 24d of the groove. Each protrusion 50 ensures the 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 ensured by a diametral interference between the protrusion 50 and the second lateral wall 24b of the groove. The outer diameter of the protrusion 50 is larger than the inner diameter of the inner edge 24d of the groove.

[0074] The mounting portion 46 of the mounting plate also includes a plurality of notches 51 formed in the collar 49. The notches 51 are blind and oriented axially toward the outer side of the bearing. The notches 51 do not extend through the axial thickness of the collar 49. Each notch 51 extends axially from the outer face of the collar 49 (i.e., the face oriented axially toward the outer side of the bearing 12). Each notch 51 extends into the thickness of the collar 49 but does not open on its inner face, which supports the first lateral wall 24a of the groove abutting the outer ring. Each notch 51 partially forms a cavity extending from the outer face of the collar 49 and recessed relative to the outer face of the collar 49. Each notch 51 extends over a limited angular sector, for example, over an angular sector between 5° and 10°. In this case, each notch 51 has a rectangular shape. Alternatively, the notches 51 may have other shapes.

[0075] Notches 51 and protrusions 50 are associated in pairs, with one notch and one protrusion. Each notch 51 in a pair is radially offset inward relative to the protrusion 50 in the pair, and is located in the radial extension of the protrusion. Like the protrusions 50, the notches 51 are also regularly spaced apart from each other in the circumferential direction and are identical to each other.

[0076] In the region of each notch 51, the collar 49 has an axial thickness that is locally reduced relative to the axial thickness of the rest of the collar outside the notch region.

[0077] As will be described in more detail below, during the formation of the protrusion 50, a notch 51 is obtained on the collar 49 of the mounting portion 46 of the mounting plate through local deformation of the material.

[0078] Multiple through openings 52 are formed through the thickness of the radial portion 42 and the connecting portion 48 of the mounting plate 40. The openings 52 are formed during partial cutting of the mounting plate 40 to form tabs 44. Tabs 44 are formed by cutting, bending, and crimping the mounting plate 40. The openings 52 are spaced apart from each other in the circumferential direction. Each tab 44 is circumferentially aligned with its associated opening 52. The number of openings 52 corresponds to the number of tabs 44. (As shown in...) Figure 10 As can be seen, the root of each tab 44 extends from the inner edge of the associated opening 52 located on the radial portion 42. In this case, each notch 51 of the mounting portion 46 of the mounting plate is located between two consecutive openings 52 in the circumferential direction.

[0079] 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 paint. In this case, mounting plate 40 is manufactured as a single piece.

[0080] To assemble bearing system 10, the following steps are performed.

[0081] In the first step, after manufacturing the grounding brush assembly 14, the assembly 14 is axially displaced relative to the bearing 12 so that the collar 49 of the mounting plate 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 collar 49 remains radially spaced from the inner edge 24d of the groove of the outer ring. In other words, the free end of the collar 49 does not interfere with the inner edge 24d of the groove.

[0082] Next, in the second step, a tool is used to locally deform the collar 49 of the mounting plate to form a protrusion 50 through the radial flow of material in the collar 49.

[0083] To achieve this, an axial force is applied to the collar 49 using a tool to form a notch 51 corresponding to the imprint of the tool teeth through upsetting of the material (and therefore without chip removal), and a protrusion 50 formed by the outward radial flow of material in the direction of the bottom 24c of the groove on the outer ring. The notch 51 and the protrusion 50 are obtained by localized plastic deformation of the collar 49 of the mounting plate.

[0084] like Figure 11 As shown, the bearing system 10 can be installed in the hole of the associated electric motor housing 54 and on the motor's rotating shaft 56. The bearing 12 is radially mounted between the hole of the housing 54 and the motor's rotating shaft 56.

[0085] During the operation of the electric motor, the charge accumulated on the shaft 56 is dissipated toward the seat 54 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) configured to rotate 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 in the support (32), characterized in that, The grounding brush assembly (14) further includes a brush mounting plate (40) fixed to the support (32) of the brush (30) and including a mounting portion (46) disposed inside a groove (24) formed in a hole (18b) of 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) facing each other axially, a bottom (24c) connecting the first lateral wall and the second lateral wall, and an inner edge (24d) extending between the second lateral wall (24b) and the end face (18c) of the outer ring. The mounting portion (46) of the mounting plate includes at least one collar (49) and at least one protrusion (50). The at least one collar (49) is axially supported against a first lateral wall (24a) of the groove, the free end of the collar (49) being radially offset inward or flush with the inner edge (24d) of the groove, the at least one protrusion (50) protruding outward from the collar (49) toward the bottom (24c) of the groove, the free end of the protrusion (50) being radially offset outward relative to the inner edge (24d) of the groove to ensure that the mounting plate (40) is axially held relative to the outer ring (18), the collar (49) locally having at least one axial thickness reduction region with a reduced axial thickness relative to the rest of the collar, the rest of the collar being located in the radial extension of the protrusion (50).

2. The system according to claim 1, characterized in that, The mounting portion of the mounting plate is provided with at least one blind notch (51) formed in the collar (49), the at least one blind notch (51) being oriented outward in the axial direction and defining the axial thickness reduction region.

3. The system according to claim 1 or 2, characterized in that, The protrusion (50) of the mounting portion of the mounting plate radially supports the bottom (24c) of the groove abutting against the outer ring (18) of the bearing.

4. The system according to any one of the preceding claims, characterized in that, The mounting portion (46) of the mounting plate includes a plurality of protrusions (50), each protrusion projecting outward from the collar (49) toward the bottom (24c) of the groove and spaced apart from each other in the circumferential direction. The free end of each protrusion (50) is radially offset outward relative to the inner edge (24d) of the groove. The collar (49) locally has a plurality of axial thickness reduction regions with a reduced axial thickness relative to the rest of the collar, each of the regions being located in a radial extension of one of the protrusions (50).

5. The system according to claim 4, characterized in that, The protrusions (50) are regularly spaced apart from each other in the circumferential direction.

6. The system according to any one of the preceding claims, characterized in that, The collar (49) of the mounting portion (46) of the mounting plate remains spaced apart from the second lateral wall (24b) of the groove (24) of the outer ring of the bearing.

7. The system according to any one of the preceding claims, characterized in that, The collar (49) of the mounting portion (46) of the mounting plate is annular.

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

9. An electric motor comprising a housing (54), a shaft (56), 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 (54) and the shaft (56).

10. A method for assembling a bearing system (10) according to any one of claims 1 to 8, comprising the following steps: - The grounding brush assembly (14) is axially displaced relative to the bearing (12) such that the collar (49) of the mounting portion (46) of the mounting plate is axially supported against the first lateral wall (24a) of the groove (24) of the outer ring of the bearing, and then - The radial flow of the material causes localized deformation of the collar material to form the protrusion.

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