Stator components for electric machines

Abstract

The invention relates to a stator assembly (2) for an electric machine, comprising a first housing part (4), a second housing part (38), a stator body (72) at least inserted into the first housing part (4), a linking device (80, 28) for rotatably linking the stator body (72) with the first housing part (4), a first fastening device (104) for fastening the stator body (72) to the first housing part (4), and a second fastening device (114) for fastening the two housing parts (4, 38) to each other. The assembly (2) comprises an annular seal (86) axially interposed between the stator body (72) and the first fastening device (104) and axially interposed between the two housing parts (4, 38).

Description

[0001] The present invention relates to the field of stator assemblies designed to be fitted to electric machines, and more particularly to stator assemblies designed to be fitted to electric traction machines of electric or hybrid electric motor vehicles.

[0002] An electric machine, which is usually designed to be fitted to a power unit of an electric or hybrid electric motor vehicle, comprises a stator built into a housing.

[0003] The stator is built into the housing in this way so that the stator is cantilevered inside the housing, which leads to the occurrence of very energetic low-frequency vibration modes. In the case of electric traction machines of motor vehicles, stator torsional modes of about 650 Hz usually occur around the axis of the electric machine. The torque transmitted by the electric machine contains a certain number of harmonics, which significantly excite these modes, causing significant vibrations. This has a negative impact on the acoustic and vibration reliability of the stator assembly, i.e., when operating in these vibration modes, the mechanical resistance of the assembly is impaired and the vibrations caused produce acoustic noises that are uncomfortable for the vehicle occupants. Therefore, there is a need for an embedded link between the housing and the stator with less torsional flexibility.

[0004] Document JP S649435 discloses a cantilever stator fastened in a stator housing using a threaded rod. A centering annular seal facilitates assembly of the stator and limits vibrations inherent to incorrect centering and helical dispersion of the threaded rod, but does not limit vibrations caused by the torsional modes of the stator itself.

[0005] In view of the above, the present invention aims to provide a stator assembly that overcomes the above disadvantages.

[0006] More specifically, the invention aims to increase the stiffness of the embedded link between the stator and the housing in order to improve the acoustic and vibration reliability of the stator assembly.

[0007] For this purpose, a stator assembly for an electric machine is proposed, which comprises a first housing part, a second housing part, a stator body inserted at least into the first housing part, a linking device for rotatably linking the stator body to the first housing part, a first fastening device for fastening the stator body to the first housing part, and a second fastening device for fastening the housing parts to each other.

[0008] According to one of its general characteristics, the assembly comprises an annular seal interposed axially between the stator body and the first fastening means and between the two housing parts.

[0009] The inclusion of such an annular seal makes it possible to use a single component to form a seal between the interior and exterior of the housing and to increase the stiffness of the embedded link between the stator and the housing. Due to the increased stiffness, the annular seal so arranged works flat and provides very high stiffness in its plane. This enhances the acoustic and vibration reliability of the stator assembly.

[0010] According to a particular embodiment, the annular seal comprises an inner radial portion and an outer radial portion, the inner radial portion being axially interposed between the stator body and the first fastening means, and the outer radial portion being axially interposed between the casing portions.

[0011] The annular seal thus arranged is rigidly held by the housing. This enables the annular seal to further increase the rigidity of the embedded connection between the stator and the housing.

[0012] Advantageously, the inner radial portion accepts a symmetry plane perpendicular to the axial direction, the outer radial portion accepts a symmetry plane perpendicular to the axial direction, the axial offset between the symmetry plane of the inner radial portion and the symmetry plane of the outer radial portion being less than 3 mm.

[0013] This limitation of the axial deflection brings the bearing plane of the annular seal on the stator closer to the bearing plane of the annular seal on the housing parts. This maximizes the participation of the annular seal in increasing the rigidity of the embedded link.

[0014] Advantageously, the axial thickness of the inner radial portion and / or the outer radial portion is between 0.25 mm and 0.8 mm.

[0015] In one embodiment, the first shell portion has a cylindrical cavity, the stator body is inserted into the cylindrical cavity, the linking device has an axial straight rib protruding radially outward from the stator body, and an axial straight groove formed in the first shell portion and extending radially outward from the cylindrical cavity, the rib being seated in the groove.

[0016] Advantageously, the assembly comprises a first axial through-hole formed in the annular seal, a second axial through-hole formed in the rib, and a third axial through-hole formed in the first housing portion and axially aligned with the groove, the third hole having threads, and the assembly comprises a threaded pin passing through the first hole and the second hole and cooperating with the threads of the third hole.

[0017] The annular seal, the stator and the first housing portion can be securely fastened using a threaded pin that passes through the first and second apertures and cooperates with the threads of the third aperture.

[0018] A washer may also be associated with the pin, the pin having a head, the washer being interposed axially between the stator body and the head.

[0019] This washer adds torsional and compressive strength when the pin is tightened.

[0020] Preferably, the second fastening device comprises a first axial through hole formed in the second housing portion, a second axial hole formed in the first housing portion, and a screw, the second hole having threads, the screw passing through the first hole and cooperating with the threads of the second hole.

[0021] The housing parts can be securely fastened using a screw which passes through the first hole and cooperates with the thread of the second hole.

[0022] In one embodiment, the annular seal is at least partially made of thin steel sheet, preferably thin steel sheet with a high elastic limit.

[0023] A seal made of sheet steel significantly increases the rigidity of the embedded connection between the stator and the housing, in particular for sheet steel having a high elastic limit.

[0024] The limited thickness of the seal helps to compensate for the geometric tolerances of the parts making up the stator assembly, thus limiting the stresses that occur.

[0025] According to another aspect, an electric machine for a motor vehicle is proposed, the electric machine comprising a stator assembly as defined above.

[0026] Other objects, features and advantages of the invention are set forth in the following description given purely by way of non-limiting example and with reference to the accompanying drawings, in which:

[0027] - Figure 1 is a radial view of a stator assembly according to a first embodiment of the present invention,

[0028] - Figure 2 yes Figure 1 Axial cross-sectional view of the components in

[0029] - Figure 3 It is composed Figure 1 and Figure 2 An exploded perspective view of the components of the assembly, and

[0030] - Figure 4 is an axial cross-sectional view of an assembly according to a second embodiment of the present invention.

[0031] Figures 1 to 3 is a schematic diagram of a stator assembly 2 designed to be fitted to an electric machine (not shown). In this case, the electric machine to which the assembly 2 is fitted is an electric traction machine of an electric drive or hybrid electric drive motor vehicle.

[0032] The assembly 2 comprises in particular a first housing part 4, Figure 2 and Figure 3 The portion 4 is axisymmetric about the axis of symmetry 6. A direct orthogonal vector basis 8 is attached to the portion 4. The basis 8 includes the vectors Vector and vector Vector Parallel to axis 6.

[0033] In this application, unless otherwise indicated, the terms "axial", "axially", "radial", "radially" and "tangential" are to be understood in relation to the axis 6. Furthermore, the term "cylindrical" is to be understood according to its conventional definition, i.e. a cylindrical surface is a surface comprising straight lines in a given direction that meet a given curve.

[0034] The first part 4 comprises a body 10. The body 10 is cylindrical about the axis 6, with a circular axial section. The body 10 extends radially between an outer cylindrical surface 12 and an inner cylindrical surface 14. The surfaces 12 and 14 are cylindrical about the axis 6, with a circular axial section, and have diameters d 12 and d 14 .

[0035] The portion 4 has a rear wall 16. The wall 16 extends axially between an outer axial surface 18 and an inner axial surface 20. The surfaces 18 and 20 are flat and are aligned with the vector The surfaces 18, 20 extend the surfaces 12, 14 respectively. The wall 16 has a through opening 22. The opening 22 is cylindrical about the axis 6, has a circular axial section and has a diameter d 22 The opening 22 is designed to receive a rotor shaft (not shown).

[0036] The portion 4 has four radial projections 24 which are regularly spaced around the circumference of the surface 12. The projections 24 are spaced with respect to the vector The projections 24 are substantially identical to each other.

[0037] The portion 4 has four radial projections 26 which are regularly spaced around the circumference of the surface 12. The projections 26 are axially aligned with the projections 24. The projections 24 are axially positioned between the wall 16 and the projections 26. The projections 26 are axially aligned with the vector The thickness of the protrusion 26 in the radial direction is strictly greater than the thickness of the protrusion 24 in the radial direction. The protrusions 26 are substantially identical to each other.

[0038] The portion 4 has four axial straight grooves 28. The grooves 28 are relative to the vector The grooves 28 are regularly spaced around the circumference of the surface 14. The grooves 28 extend radially outward from the surface 14 to form an internal groove in the surface 14. The grooves 28 are radially and inwardly aligned with the protrusions 24 and 26, respectively.

[0039] Part 4 has Figure 3 The collar 30 is shown. The collar 30 extends radially outward from the surface 12. The collar 30 surrounds the vector The projection 26 is axially positioned between the projection 24 and the collar 30. The collar 30 is axially delimited by an outer axial surface 31 opposite to the projection 26. In this way, the portion 4 extends axially between the surface 18 and the surface 31.

[0040] In general, the collar 30 is radially delimited by an outer cylindrical surface 32. The surface 32 is cylindrical about the axis 6, has a circular axial cross section, and has a diameter d 32 The collar 30 has twelve radial flanges 34 in part. The flanges 34 surround the vector The collar 30 is cylindrical in the direction of the projections 24 and 26. The flanges 34 are regularly spaced around the circumference of the surface 32. The collar 30 also partially has four radial flanges 36. The flanges 36 are thicker than the flanges 34. The flanges 36 are regularly spaced around the circumference of the cylindrical surface 32. More specifically, the flanges 36 are axially aligned with the projections 24 and 26. Thus, each flange 36 extends between two adjacent flanges 34 in the tangential direction.

[0041] Reference Figures 1 to 3 , the assembly 2 has a second housing part 38. The part 38 is axisymmetrical about the axis 6. When assembled, the part 4 and the part 38 form the housing of the electric machine.

[0042] The portion 38 comprises a body 40 which is cylindrical about the axis 6. The body 40 extends radially between an outer cylindrical surface 42 and an inner cylindrical surface 44. The surfaces 42, 44 are each cylindrical about the axis 6, have a circular axial section, and each have a diameter d 42 and d 44 . Diameter d 42 and d 44 Equal to the diameter d 12 and d 14 :

[0043]

[0044] The portion 38 has a rear wall 46 extending axially between an inner axial surface 48 and an outer axial surface 50. The surfaces 42, 44 are connected to surfaces 50, 48, respectively.

[0045] The wall 46 has a cylindrical through opening 52. The opening 52 is cylindrical about the axis 6, has a circular axial section and has a diameter substantially equal to d 22 The diameter d 52 Similar to opening 22, opening 52 is designed to receive a rotor shaft (not shown).

[0046] The portion 38 has a collar 54. The collar 54 surrounds the vector In general, the collar 54 is radially delimited by an outer cylindrical surface 56. The surface 56 is cylindrical about the axis 6, has a circular axial cross-section, and has a diameter d 56 . Diameter d 56 Basically equal to the diameter d 32 The collar 54 partially has twelve relatively thin radial flanges 58, and four relatively thick radial flanges 60. The flanges 58, 60 are axially aligned with the flanges 36, 34, respectively. In this way, the collar 54 is substantially identical to the collar 30.

[0047] The collar 54 extends axially between a proximal front surface 62 and a distal front surface 64 (not shown). Surfaces 62 and 64 are flat and aligned with vector Vertical. Thus, portion 38 extends axially between surface 50 and surface 64. Furthermore, surface 64 and surface 31 form a seam bead designed to abut against each other directly or indirectly in order to form a sealing seat for the stator seated in the housing.

[0048] The portion 38 has four axial straight grooves 61, Figure 2 . Groove 61 is axially aligned with groove 34. The axial cross-section of groove 61 is substantially the same as the axial cross-section of groove 34. Thus, groove 61 extends radially inwardly from surface 44 to form an internal recess in surface 44.

[0049] As in Figure 2 As shown in FIG. 4 , portion 4 includes a cavity 66. Cavity 66 is relative to vector The cavity 66 extends axially between the surface 20 and the surface 31. The cavity 66 is delimited radially and externally by the surface 14 and the surfaces delimiting the grooves 28.

[0050] Portion 38 contains a cylindrical cavity 68. Cavity 68 extends axially between surface 64 and surface 48. Cavity 68 is radially bounded by surface 44, and inner surface 61 of the groove.

[0051] The assembly 2 comprises a stator 70 . The stator 70 comprises, among other things, a stator body 72 and a stator winding 74 .

[0052] The stator body 72 is cylindrical and axisymmetric about the axis 6. Generally, the stator body 72 extends radially between an outer cylindrical surface 78 and an inner cylindrical surface 79. The surfaces 78 and 79 are cylindrical about the axis 6 with a circular axial cross section. The diameter d of the circular axial cross section of the surface 78 is 78 Specific diameter d 14 Slightly smaller.

[0053] The stator body 72 partially has four ribs 80. The ribs 80 are arranged in a vector The ribs 80 are regularly spaced around the circumference of the surface 78. The ribs 80 extend radially outward from the surface 78. The ribs 80 extend along the entire axial length of the stator body 72. The thickness of the ribs 80 is slightly less than the depth of the slots 28.

[0054] Stator body 72 extends axially between front surface 82 and front surface 84. Surface 82 and surface 84 are flat and aligned with vector vertical.

[0055] Assembly 2 has an annular seal 86. Seal 86 is cylindrical and axisymmetrical about axis 6. Seal 86 is intended to seal cavities 66 and 68 from the outside of the housing and to reinforce the rigidity of the embedded link between elements 4, 38 and 72.

[0056] The seal 86 is made of a thin steel plate having a high elastic limit. For example, the seal 86 can be made of the steel in the following table:

[0057]

[0058] The seal 86 is substantially flat and parallel to the vector The seal 86 is radially delimited by an inner cylindrical surface (not referenced) having a circular axial cross-section about the axis 6 and having a diameter d 86i In general, the seal 86 is radially delimited by an outer cylindrical surface (not referenced) having a circular axial section around the axis 6 and having a diameter d 86e . Diameter d 86i Strictly smaller than diameter d 78 . Diameter d 86e Strictly larger than diameter d 14 , and preferably slightly smaller than the diameter d 12 . More specifically, in the example shown:

[0059]

[0060]

[0061] The seal 86 is radially extended locally by four lugs 87. The lugs 87 are regularly spaced around the circumference of the outer surface of the seal 86. The radial thickness of the lugs 87 is substantially equal to the radial thickness of the flange 36.

[0062] The seal 86 is divided into an inner radial portion 88 and an outer radial portion 90. The limit between the portions 88 and 90 corresponds to the axial protrusion of the stator body 72 on the flat surface of the seal 86. In other words, the portion 88 has a diameter d positioned around the axis 6. 86i With d 78 In addition, the portion 88 has four parts of the seal 86, which are axially aligned with the four ribs 80 respectively. The portion 90 corresponds to the remaining portion of the seal 86.

[0063] The portion 88 and the portion 90 respectively accept the symmetry plane P 对称_88 and the symmetry plane P 对称_90 (not shown). Plane P 对称_88 and P 对称_90 With vector is perpendicular and is positioned in the middle of the axial thickness of portions 88 and 90. In the first embodiment, plane P 对称_88 and plane P 对称_90 The thickness of the seal 86 is between 0.25 mm and 0.8 mm.

[0064] The seal 86 has a rib 92 on one of its axial surfaces. The rib 92 extends around the entire circumference of the axial surface of the seal 86. The rib 92 is formed on the outer radial portion 90. In the radial protrusion, the rib 92 is located at a distance l from the outer radial limit of the seal 86. 92 The distance l 92 In other words, the rib 92 as a whole forms a rib having a diameter greater than d around the axis 6. 14 The diameter is d 92 The rib 92 is partially displaced relative to the circle away from the axis 6, the gap varying from zero to a maximum value that is slightly greater than the radial depth of the groove 28. Thus, depending on the orientation of the seal 86, the rib 92 can be in full contact with the surface 64 or with the surface 31.

[0065] Reference Figure 3 , section 4 includes twelve axial holes 94. Holes 94 are blind holes. Holes 94 are cylindrical and have a radius about the vector of circular cross-section parallel to the axis and having a diameter d 94 The holes 94 are threaded. Twelve holes 94 are formed in the twelve flanges 34, respectively.

[0066] The portion 38 has twelve axial holes 96. The holes 96 are cylindrical and have a radius about the vector of circular axial section parallel to the axis and having a diameter d 96 The hole 96 is a through hole and is threaded like the hole 94. Twelve holes 96 are formed in the twelve flanges 58, respectively. The diameter d 94 and diameter d 96 Basically equal.

[0067] d 94 =d 96 ±1%

[0068] The seal 86 has four axial apertures 98. The apertures 98 are cylindrical and have a radius about the vector of circular axial section parallel to the axis and having a diameter d 98 The aperture 98 is radially and inwardly aligned with the lug 87 .

[0069] The stator body 72 has four axial apertures 100. The axial apertures 100 are cylindrical and have a radius about the vector of circular axial section parallel to the axis and having a diameter d 100 Four apertures 100 are formed in the four ribs 80 , respectively.

[0070] Reference Figure 2 , part 4 comprises four axial apertures 102. The apertures 102 are blind holes and are threaded. The apertures 102 are cylindrical and have a diameter about the vector of circular axial section parallel to the axis and having a diameter d 102 Four orifices 102 are formed in the four protrusions 24, respectively. Diameter d 98 , diameter d 100 and diameter d 102 Basically equal.

[0071] Reference Figure 3 , assembly 2 has four threaded pins 104. Each pin 104 has a head 106, a non-threaded portion 108 and a threaded portion 110. Portion 108 is axially positioned between head 106 and portion 110. Portions 108 and 110 are cylindrical, with a specific diameter d 98 The slightly smaller diameter is d 104 The thread of portion 110 is designed to cooperate with the thread of orifice 102.

[0072] Four washers 112 are respectively associated with the four pins 104. The inner diameter d of the washers 112 is 112i Slightly larger than diameter d 104 The outer radius r of the gasket 112112e Strictly smaller than the minimum distance between the axis of the orifice 98 and the rib 92 .

[0073] The washer 112 is preferably made of a non-magnetic material. For example, one of the steels in the following table can be used to make the washer 112:

[0074] European Standard EN 10027 Standard Afnor NF A 35573 American Standard AISI X5CrNi18-10 1.4301 Z7CN18-09 304

[0075] Assembly 2 has twelve screws 114. Each screw 114 includes a head 116 and a threaded shank 118. The diameter d of the shank 118 is 118 and the threads are designed to be compatible with the diameters d of holes 96 and 94. 96 Compatible with d94 and thread.

[0076] Component 2 can be assembled as follows:

[0077] First, the stator 70 is inserted into the cavity 66. More specifically, the stator body 72 is fully seated in the cavity 66, and a portion of the winding 74 axially protrudes from the cavity 66. The ribs 80 enter the slots 28.

[0078] The seal 86 is then arranged against the surface 82. In this arrangement, the portion 88 abuts against the surface 82 and the portion 90 abuts axially against the surface 31.

[0079] The pin 104 is then inserted into and pivoted in the apertures 98, 100 and 102. This causes the threads of the portion 110 to mate with the threads of the aperture 102. When the pin 104 is tightened, the elements 4, 70 and 86 form a rigid assembly.

[0080] In this embodiment, the seal 86 is arranged at Figure 3 The seal 86 is thus naturally in a position in which the rib 92 is adjacent to the elements 4 and 70 without exceeding the scope of the invention. In this case, the rib 92 presses axially against the surface 31.

[0081] Portion 38 is then in contact with portion 4 so that surfaces 31 and 64 face each other axially. More specifically, portion 38 is oriented relative to portion 4 so that flange 60 is arranged facing flange 26. In this arrangement, surface 64 is in direct contact with rib 92.

[0082] Then tighten the screw 114. This makes the thread of the rod 118 match the thread of the hole 94 and the hole 96. When the screw 114 is tightened, the element 4, the element 70, the element 86 and the element 38 form a rigid assembly. The surface 64 axially compresses the rib 92 to form a seal between the interior space and the exterior space of the housing. The seal 86 is compressed between the seam bead 31 and the seam bead 64 and axially abuts against the stator body 72. Using the pin 104 to tighten the stator body 72 and making the seal 86 from a thin steel plate with a high elastic limit and a low thickness helps to increase the rigidity of the embedded link between the stator body 72 and the housing.

[0083] Despite Figures 1 to 3 In the example shown in the figure, the assembly 2 has four subassemblies, each of which includes a protrusion 24, a protrusion 26, a flange 36, a lug 87, a flange 60, an orifice 98, an orifice 100, an orifice 102, a washer 112 and a pin 104, whereby a different number of such subassemblies can naturally be selected without exceeding the scope of the invention. Thus, other numbers of subassemblies can also be selected without exceeding the scope of the invention, each of which has a flange 34, a flange 58, a hole 94, a hole 96 and a screw 114. Thus, other numbers of subassemblies can also be selected without exceeding the scope of the invention, each of which has a rib 80 and a groove 28.

[0084] Despite Figures 1 to 3 In the example shown, only the orifice 102 is threaded, whereby it is naturally possible to make one of the orifices 98 and 100 threaded without exceeding the scope of the invention. Likewise, the hole 96 may be unthreaded.

[0085] Figure 4 is a schematic representation of a stator assembly 120 according to a second embodiment of the present invention. Like elements are denoted using like reference numerals.

[0086] The axial length of the stator body 72 of the assembly 120 is shorter than the axial length of the stator body 72 of the assembly 2. The inner radial portion 88 is axially offset relative to the outer radial portion 90. Plane P 对称_88 With plane P 对称_90 The axial offset Δ between is substantially equal to the offset between the surface 31 and the surface 82 when the stator body 72 is mounted on the bottom of the cavity 66. The offset Δ is preferably strictly less than 3 mm.

[0087] In this embodiment, seal 86 has a cylindrical portion 122 in addition to portion 88 and portion 90. Portion 122 is oriented relative to vector The axial cross section of the portion 122 corresponds to the axial protrusion of the stator body 72. The axial thickness of the portion 122 is substantially equal to the offset Δ.

[0088] In this embodiment, even in the case where the stator body 72 is axially shorter than the portion 4, this arrangement can form a seal between the inner space and the outer space of the housing and increase the rigidity of the embedded link.

[0089] In the second embodiment, the seal 86 is designed to take into account a reduction in the axial length of the stator body 72. However, it is naturally possible to adapt the seal 86 to take into account an increase in the axial length of the stator body 72 without exceeding the scope of the invention.

[0090] The formation of a seal between the inside and the outside of the housing facilitates the suction of hydraulic fluid. This makes the oil fluctuations at the suction point less sensitive to tilting due to the smaller displacement of the hydraulic fluid. Increasing the rigidity of the embedded link between the housing and the stator body effectively absorbs vibrations that may occur in this link, thereby enhancing the acoustic and vibration reliability of the stator assembly according to the invention.

Claims

1. A stator assembly for an electric machine, the stator assembly comprising a first housing portion (4), a second housing portion (38), a stator body (72) at least inserted into the first housing portion (4), a linking device for rotatably linking the stator body (72) to the first housing portion (4), a first fastening device for fastening the stator body (72) to the first housing portion (4), and a second fastening device for fastening the first housing portion (4) and the second housing portion (38) to each other, characterized in that The stator assembly includes an annular seal (86) disposed axially between the stator body (72) and the first fastening device and axially between the first housing portion (4) and the second housing portion (38).

2. The stator assembly according to claim 1, wherein: The annular seal (86) includes an inner radial portion (88) and an outer radial portion (90), the inner radial portion being axially disposed between the stator body (72) and the first fastening device, and the outer radial portion being axially disposed between the first housing portion (4) and the second housing portion (38).

3. The stator assembly of claim 2, wherein: The inner radial portion (88) receives the axial direction perpendicular to the plane of symmetry, the outer radial portion (90) receives the axial direction The axial offset (Δ) between the perpendicular symmetry planes of the inner radial portion (88) and the symmetry plane of the outer radial portion (90) is less than 3 mm.

4. The stator assembly according to claim 2 or 3, wherein: The axial thickness of the inner radial portion (88) and / or the outer radial portion (90) is between 0.25 mm and 0.8 mm.

5. The stator assembly according to any one of claims 1 to 3, wherein: The first housing portion (4) has a cylindrical cavity (66), the stator body (72) is inserted into the cylindrical cavity (66), the linking device has an axial linear rib (80) protruding radially outward from the stator body (72), and an axial linear groove (28) formed in the first housing portion (4) and extending radially outward from the cylindrical cavity (66), the axial linear rib (80) being seated in the axial linear groove (28).

6. The stator assembly as described in claim 5 comprises a first axial through-hole (98) formed in the annular seal (86), a second axial through-hole (100) formed in the axial linear rib (80), and a third axial hole (102) formed in the first housing portion (4) and axially aligned with the axial linear groove (28), the third axial hole (102) having a thread, and the assembly comprises a threaded pin passing through the first axial through-hole (98) and the second axial through-hole (100) and cooperating with the thread of the third axial hole (102).

7. The stator assembly of claim 6, comprising a washer (112) associated with the threaded pin, the threaded pin having a head (106), the washer (112) being interposed axially between the stator body (72) and the head (106).

8. The stator assembly of claim 5, wherein: The second fastening device includes a first axial through hole (96) formed in the second housing portion (38), a second axial hole (94) formed in the first housing portion (4), and a screw, wherein the second axial hole (94) has a thread, and the screw passes through the first axial through hole (96) and cooperates with the thread of the second axial hole (94).

9. The stator assembly according to any one of claims 1 to 3, wherein: The annular seal (86) is at least partially made of sheet steel.

10. An electric machine for a motor vehicle, the electric machine having a stator assembly as claimed in any one of claims 1 to 9.

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