Rotating electric machine

Abstract

A rotating electric machine (10) comprises: a stator core (16); a case (18) that accommodates the stator core; and a tolerance ring (20) that is provided between the stator core and the case along the circumferential direction of the stator core and that fixes the stator core to the case. The stator core has a plurality of tooth sections (24) extending radially toward the radially inner side of the stator core. The tolerance ring has a plurality of protrusions (32) that are arranged in the circumferential direction of the tolerance ring and protrude in the radial direction of the tolerance ring. The position of each protrusion is set at at least one of a position on a center line (Lc) of each tooth section and a position symmetric with respect to the center line.

Description

Rotating electrical machine Cross-reference to related applications

[0001] This application is based on Japanese Application No. 2024-197644 filed on November 12, 2024, claims the benefit of its priority, and all contents of the patent application are incorporated herein by reference.

[0002] The technology of this disclosure relates to a rotating electrical machine.

[0003] Conventionally, there is a rotating electrical machine including a stator core, a case housing the stator core, and a tolerance ring provided between the stator core and the case along the circumferential direction of the stator core to fix the stator core to the case (see, for example, Japanese Patent Publication No. 2024-527130). In this rotating electrical machine, a plurality of grooves extending in the axial direction of the stator core are formed on the outer peripheral surface of the stator core. The tolerance ring has a plurality of protrusions arranged in the circumferential direction of the stator core and protruding toward the case side respectively. The plurality of protrusions include protrusions arranged at positions overlapping the grooves and protrusions arranged at positions deviated from the grooves.

[0004] As a result of the inventors' detailed examination, the following problems were found. That is, as described above, when the tolerance ring has protrusions arranged at positions overlapping the grooves and protrusions arranged at positions deviated from the grooves, the fastening force of the tolerance ring becomes non-uniform in the circumferential direction of the stator core, and there is a risk that the roundness of the inner diameter of the stator core deteriorates.

[0005] The technology of this disclosure provides a rotating electrical machine capable of improving the roundness of the inner diameter of the stator core as compared with the prior art.

[0006] A rotating electric machine according to one aspect of the technology of the present disclosure comprises a stator core, a case housing the stator core, and a tolerance ring provided between the stator core and the case along the circumferential direction of the stator core and fixing the stator core to the case, wherein the stator core has a plurality of teeth extending radially inward toward the radial side of the stator core, and the tolerance ring has a plurality of projections arranged in the circumferential direction of the tolerance ring, each projection projecting radially toward the tolerance ring, the position of each projection set to at least one of the positions on the center line of each tooth portion and positions symmetrical with respect to the center line.

[0007] The technology of this disclosure provides a rotating electric machine that can improve the roundness of the inner diameter of the stator core compared to conventional machines.

[0008] This is a plan view of a rotating electric machine according to one embodiment of the technology of this disclosure. This is a perspective view of a tolerance ring. This is a plan view of a stator assembly. This is a cross-sectional view showing the case and tolerance ring before assembly. This is a perspective view showing the main part of the tolerance ring. This is a cross-sectional view of the tolerance ring and core member. This is a cross-sectional view of the tolerance ring and core member according to a first modified example. This is a cross-sectional view of the tolerance ring and core member according to a second modified example. This is a cross-sectional view of the tolerance ring and core member according to a third modified example. This is a cross-sectional view of the tolerance ring and core member according to a fourth modified example. This is a cross-sectional view of the tolerance ring and core member according to a fifth modified example. This is a cross-sectional view of the tolerance ring and core member according to a sixth modified example. This is a cross-sectional view of the tolerance ring and core member according to a seventh modified example. This is a cross-sectional view of the tolerance ring and core member according to an eighth modified example. This is a perspective view showing the main part of the tolerance ring according to a ninth modified example. This is a perspective view showing the main part of the tolerance ring according to a tenth modified example. This is a perspective view showing the main part of the tolerance ring according to an eleventh modified example. This is a perspective view showing the main part of the tolerance ring according to a twelfth modified example. This is a front view showing the connecting portion of the tolerance ring according to the 13th modified example. This is a plan view showing the connecting portion of the tolerance ring according to the 14th modified example. This is a plan view showing the connecting portion of the tolerance ring according to the 15th modified example. This is a plan view showing the connecting portion of the tolerance ring according to the 16th modified example. This is a plan view showing the connecting portion of the tolerance ring according to the 17th modified example. This is a plan view showing the connecting portion of the tolerance ring according to the 18th modified example. This is a perspective view of the tolerance ring according to the 19th modified example.

[0009] Hereinafter, an embodiment of the technology of this disclosure will be described with reference to the drawings.

[0010] As shown in Figure 1, the rotating electric machine 10 comprises a stator assembly 12 and a rotor 14. The stator assembly 12 comprises a stator core 16, a case 18, and a tolerance ring 20.

[0011] The stator core 16 is composed of a plurality of core members 22. Each core member 22 is a laminate formed by stacking a plurality of core sheets in the Z direction. The stator core 16 is formed by combining the plurality of core members 22 in an annular shape. The rotor 14 is rotatably positioned inside the stator core 16.

[0012] The core member 22 is formed in a T-shape when viewed from the axial direction of the stator core 16, and has a teeth portion 24 and a core back portion 26. The core member 22 is formed symmetrically in the tangential direction of the stator core 16. The core back portion 26 is located radially outward of the stator core 16 relative to the teeth portion 24. The core back portion 26 extends on both sides of the stator core 16 in the tangential direction relative to the teeth portion 24, and the teeth portion 24 extends radially inward from the center of the core back portion 26 toward the stator core 16. The inner diameter of the stator core 16 is defined by the tip faces of the multiple teeth portions 24.

[0013] In a state where the stator core 16 is composed of multiple core members 22, the multiple core back portions 26 constitute annular portions formed on the outer circumference of the stator core 16, and the multiple tooth portions 24 extend radially from the center of the stator core 16. Slots are formed between the multiple tooth portions 24. Windings 28 are wound around each tooth portion 24 via an insulator (not shown). The stator is composed of the stator core 16, the insulator, and the windings 28.

[0014] The case 18 is formed in a cylindrical shape with a top. The stator core 16 is housed inside the case 18. The tolerance ring 20 is provided between the stator core 16 and the case 18 along the circumferential direction of the stator core 16, and fixes the stator core 16 to the case 18.

[0015] As shown in Figure 2, the tolerance ring 20 has a ring body portion 30, a plurality of projections 32, a locking portion 34, and a locking portion 36. The ring body portion 30 is formed in a C shape. The ring body portion 30 has a pair of circumferential ends 40 that are divided in the circumferential direction of the tolerance ring 20 by a dividing portion 38 that extends in the axial direction of the tolerance ring 20.

[0016] Multiple protrusions 32 are arranged in the circumferential direction of the tolerance ring 20 and each protrudes radially outward from the tolerance ring 20. The tolerance ring 20 is a metal sheet metal member, and the multiple protrusions 32 are formed by a part of the tolerance ring 20 bulging radially outward. The tolerance ring 20 is made of a metal such as carbon steel or stainless steel. The locking portion 34 and the locking portion 36 are each formed in a protruding shape.

[0017] The locking portion 34 protrudes from the ring body portion 30 toward one axial side (Z1 side) of the tolerance ring 20. The locking portion 36 protrudes from the ring body portion 30 toward the radially inward side of the tolerance ring 20. The locking portion 36 is formed by a pair of projections 36A formed on a pair of circumferential ends 40. The locking portion 34 is located between adjacent projections 32. Similarly, the locking portion 36 is located between adjacent projections 32.

[0018] As shown in Figure 3, a pair of stepped portions 44 and grooves 46 are formed on the outer circumferential surface 42 of each core member 22. The pair of stepped portions 44 are formed at both ends of the outer circumferential surface 42. The portion of the outer circumferential surface 42 excluding the pair of stepped portions 44 and grooves 46 is a flat portion 48, and the length of the flat portion 48 is set to be longer than the combined length of the pair of stepped portions 44 and grooves 46.

[0019] The groove 46 opens radially outward from the stator core 16 and penetrates through the stator core 16 in the axial direction. Of the grooves 46 formed in the multiple core members 22, the groove 46 formed in any of the core members 22 functions as a locking portion 50. When the locked portion 36 is inserted into the locking portion 50 and locked with the locking portion 50, the tolerance ring 20 can be positioned relative to the stator core 16 in the circumferential direction of the stator core 16.

[0020] As shown in Figure 4, a stepped portion 54 is formed on the inner circumferential surface 52 of the case 18, creating a step in the axial direction of the case 18. The inner circumferential surface 52 has an inner circumferential surface 52A located on one axial side (Z1 side) of the case 18, and an inner circumferential surface 52B located on the other axial side (Z2 side) of the case 18, separated by the stepped portion 54. The inner diameter of the inner circumferential surface 52A is set to be smaller than the inner diameter of the inner circumferential surface 52B. The tolerance ring 20 is mounted on the outer circumferential surface of the stator core 16 around which the winding 28 (see Figure 1) is wound, and is press-fitted into the inside of the case 18 from the other axial side (Z2 side) until it contacts the stepped portion 54.

[0021] A locking portion 56 is formed on the inner circumferential surface 52A. The locking portion 56 is formed in the shape of a groove that opens radially inward of the case 18 and on the other axial side of the case 18, and is in contact with the stepped portion 54. The locked portion 34 is inserted into the locking portion 56 and locked with the locking portion 56 when the tolerance ring 20 is press-fitted into the inside of the case 18 from the other axial side of the case 18 until it contacts the stepped portion 54. When the tolerance ring 20 contacts the stepped portion 54, the tolerance ring 20 and the stator core 16 are positioned relative to the case 18 in the axial direction. Also, when the locked portion 34 is locked with the locking portion 56, the tolerance ring 20 and the stator core 16 are positioned relative to the case 18 in the circumferential direction.

[0022] As shown in Figure 5, the projection 32 has inclined surfaces 58 and 60 that are inclined with respect to the axial direction of the tolerance ring 20. The projection 32 is formed in a trapezoidal cross-section, and both the inclined surfaces 58 and 60 are formed in a trapezoidal shape. The inclined surface 58 is located on the leading side (Z1 side) in the press-fitting direction when the tolerance ring 20 is press-fitted into the inside of the case 18, and the inclined surface 60 is located on the rear side (Z2 side) in the press-fitting direction. When the tolerance ring 20 is press-fitted into the inside of the case 18, the opening edge 18A of the case 18 slides against the inclined surface 58. The sliding contact between the opening edge 18A of the case 18 and the inclined surface 58 allows the tolerance ring 20 to be smoothly press-fitted into the inside of the case 18.

[0023] The inclination angle of the inclined surface 58 of the tolerance ring 20 with respect to the axial direction is set to a smaller angle than the inclination angle of the inclined surface 60 of the tolerance ring 20 with respect to the axial direction. For example, the inclination angle of the inclined surface 58 is set to less than 45 degrees. By setting the inclination angle of the inclined surface 58 to less than 45 degrees, the press-fitting load when press-fitting the tolerance ring 20 into the inside of the case 18 can be reduced. When the tolerance ring 20 is pressed into the inside of the case 18 with the outer circumferential surface of the stator core 16 attached, the projection 32 is compressed and crushed in the radial direction of the tolerance ring 20 by the outer circumferential surface of the stator core 16 and the inner circumferential surface 52 of the case 18 (see Figure 3).

[0024] As shown in Figure 6, the positions of each projection 32 are set symmetrically in the tangential direction of the stator core 16 with respect to the center line Lc of each tooth portion 24. The tooth portion 24 has a pair of side surfaces 62 facing in the tangential direction of the stator core 16. The center line Lc of the tooth portion 24 is a line that passes through the center between the pair of side surfaces 62 in an axial view of the stator core 16 and extends along the radial direction of the stator core 16. In this embodiment, two projections 32 are assigned to each core member 22. This embodiment is an example in which the number of projections 32 is an even multiple of the number of slots.

[0025] The assembly method for the stator assembly 12 is as follows. First, the winding 28 is wound around the teeth portion 24 of each core member 22 via an insulator (not shown). Next, the multiple core members 22 are combined in a ring shape to form an annular stator core 16. Next, the tolerance ring 20 is attached to the outer circumferential surface of the stator core 16. At this time, the tolerance ring 20 is positioned relative to the stator core 16 in the circumferential direction by engaging the locking portion 36 with the locking portion 50. Next, with the tolerance ring 20 attached to the outer circumferential surface of the stator core 16, the tolerance ring 20 is press-fitted into the inside of the case 18 until it abuts against the stepped portion 54. At this time, the tolerance ring 20 and the stator core 16 are positioned relative to the case 18 in the circumferential direction by engaging the locking portion 34 with the locking portion 56. The stator assembly 12 is completed in the manner described above.

[0026] As described in detail above, in this embodiment, the tolerance ring 20 has a plurality of projections 32 arranged in the circumferential direction of the tolerance ring 20. Each of the plurality of projections 32 protrudes radially outward from the tolerance ring 20. The positions of each projection 32 are set symmetrically with respect to the center line Lc of each tooth portion 24. This makes it possible to equalize the fastening force of the tolerance ring 20 in the circumferential direction of the stator core 16, thereby improving the roundness of the inner diameter of the stator core 16.

[0027] Furthermore, the stator core 16 has a locking portion 50, and the tolerance ring 20 has a locked portion 36 that is locked to the locking portion 50. Therefore, by locking the locked portion 36 to the locking portion 50, the tolerance ring 20 can be positioned relative to the stator core 16 in the circumferential direction of the stator core 16. This allows the position of each projection 32 to be set accurately to a symmetrical position around the center line Lc of each tooth portion 24.

[0028] In the above embodiment, the position of each projection 32 may be changed as follows. For example, in the modified example shown in Figure 7, the position of each projection 32 is set on the center line Lc of each tooth portion 24. In the modified example shown in Figure 7, one projection 32 is assigned to each core member 22. The modified example shown in Figure 7 is an example in which the number of projections 32 is an odd multiple of the number of slots.

[0029] Furthermore, in the modified example shown in Figure 8, the position of each projection 32 is set to either a position on the center line Lc of each tooth portion 24 or a position symmetrical to the tangential direction of the stator core 16 with respect to the center line Lc. That is, the multiple projections 32 include projections 32A set on the center line Lc of each tooth portion 24 and projections 32B set at positions symmetrical to the tangential direction of the stator core 16 with respect to the center line Lc. In the modified example shown in Figure 8, three projections 32 are assigned to each core member 22. The modified example shown in Figure 8 is an example where the number of multiple projections 32 is an odd multiple of the number of slots.

[0030] In the modified examples shown in Figures 7 and 8, as in the above embodiment, the fastening force of the tolerance ring 20 can be made uniform in the circumferential direction of the stator core 16, thereby improving the roundness of the inner diameter of the stator core 16.

[0031] Furthermore, in the above embodiment, the outer circumferential surface 42 of each core member 22 may be formed as follows. For example, in the modified example shown in Figure 9, a pair of recesses 64 and a groove 46 are formed on the outer circumferential surface 42 of each core member 22. The pair of recesses 64 are located on both sides of the teeth portion 24. By forming the pair of recesses 64 and the groove 46 on the outer circumferential surface 42 of each core member 22, a pair of protrusions 66 and a pair of protrusions 68 are formed. The pair of protrusions 66 are located on both sides of the groove 46, and the pair of protrusions 68 are located on both sides of the pair of recesses 64. The tip surfaces of the pair of protrusions 66 and the tip surfaces of the pair of protrusions 68 of the outer circumferential surface 42 form a flat portion 70 of the outer circumferential surface 42, and the length of the flat portion 70 is set to be shorter than the combined length of the pair of recesses 64 and the groove 46.

[0032] Furthermore, in the above embodiment, if the outer peripheral surface 42 of each core member 22 has the shape shown in Figure 9, the position of each projection 32 may be set as follows. For example, in the modified example shown in Figure 9, the position of each projection 32 is set on the center line Lc of each tooth portion 24. Also, in the modified example shown in Figure 10, the position of each projection 32 is set at either the position on the center line Lc of the tooth portion 24 or a position symmetrical in the tangential direction of the stator core 16 with respect to the center line Lc. That is, the plurality of projections 32 include projections 32A set on the center line Lc of each tooth portion 24 and projections 32B set at positions symmetrical in the tangential direction of the stator core 16 with respect to the center line Lc. Also, in the modified example shown in Figure 11, the position of each projection 32 is set at positions symmetrical in the tangential direction of the stator core 16 with respect to the center line Lc of the tooth portion 24. In the modified examples shown in Figures 9 to 11, similar to the above embodiment, the fastening force of the tolerance ring 20 can be made uniform in the circumferential direction of the stator core 16, thereby improving the roundness of the inner diameter of the stator core 16.

[0033] Furthermore, in the above embodiment, the position of each projection 32 may be set within the following range of the outer circumferential surface 42 of each core member 22. For example, in the modified examples shown in Figures 12 and 13, when the intersection point P is set between the extension line Le, which extends the sides 62 on both sides of each tooth portion 24 in the radial direction of the stator core 16, and the outer circumferential surface 42 of the core member 22, the position of each projection 32 is set within the range R between the intersection point P. In the modified example shown in Figure 12, the position of each projection 32 is set on the center line Lc of each tooth portion 24, and in the modified example shown in Figure 13, the position of each projection 32 is set symmetrically in the tangential direction of the stator core 16 with respect to the center line Lc of the tooth portion 24.

[0034] Here, in the region of the core member 22 on the outer surface 42 side, the region outside the pair of extension lines Le is a region with a higher density of magnetic flux M compared to the region inside the pair of extension lines Le. If the positions of each projection 32 were set outside the range R between the intersection points P, when the tolerance ring 20 is pressed in, the compressive load acting on each projection 32 would cause compressive stress to act on the region of the core member 22 with a high magnetic flux density, thus worsening the iron loss of the stator core 16.

[0035] In contrast, as shown in the modified examples in Figures 12 and 13, if the position of each projection 32 is set within the range R between the intersection points P (i.e., in a region with low magnetic flux density), it is possible to suppress the deterioration of iron loss in the stator core 16.

[0036] Furthermore, in the above embodiment, the configuration for positioning the tolerance ring 20 in the circumferential direction of the stator core 16 may be formed as follows. For example, in the modified example shown in Figure 14, a pair of grooves 72 are formed on the outer circumferential surface 42 of each core member 22. The pair of grooves 72 are formed on both sides of the groove 46. The pair of grooves 72 function as locking portions 74. In the modified example shown in Figure 14, the position of each projection 32 is set on the center line Lc of each tooth portion 24, and the tolerance ring 20 has a pair of locking portions 76. The pair of locking portions 76 are located on both sides of the projection 32. The locking portions 76 protrude radially inward from the tolerance ring 20. Even with this configuration, the tolerance ring 20 can be positioned in the circumferential direction of the stator core 16 by inserting the locking portions 76 into the locking portions 74 and locking them together.

[0037] Furthermore, in the above embodiment, the cross-sectional shape of the projection 32 and the shape of the inclined surface 58 may be formed as follows. For example, in the modified example shown in Figure 15, the projection 32 is formed in a triangular cross-section, and the inclined surface 58 is formed in a triangular shape. In the modified example shown in Figure 16, the projection 32 is formed in a semicircular cross-section, and the inclined surface 58 is formed in a semi-elliptical shape. Even with this configuration, the tolerance ring 20 can be smoothly pressed into the inside of the case 18 by the sliding contact between the opening edge 18A of the case 18 and the inclined surface 58.

[0038] Furthermore, in the above embodiment, the tolerance ring 20 may have a plurality of protrusions 32 formed as follows. For example, in the modified form shown in Figures 17 and 18, a plurality of protrusions 32 are formed in the axial direction of the tolerance ring 20 at the positions of each protrusion 32 in the above embodiment. In the modified form shown in Figure 17, two protrusions 32 are formed, and in the modified form shown in Figure 18, three protrusions 32 are formed. Even with this configuration, the fastening force of the tolerance ring 20 can be made uniform in the circumferential direction of the stator core 16, thereby improving the roundness of the inner diameter of the stator core 16.

[0039] Furthermore, in the above embodiment, the tolerance ring 20 may have a connecting portion 78 that connects a pair of circumferential ends 40. For example, in the modified example shown in Figure 19, the connecting portion 78 has a recess 80 formed on one of the pair of circumferential ends 40 and a protrusion 82 formed on the other of the pair of circumferential ends 40. The recess 80 opens on the other side of the pair of circumferential ends 40, and the protrusion 82 protrudes on one side of the pair of circumferential ends 40. The pair of circumferential ends 40 are connected by crimping with the recess 80 and the protrusion 82 connected.

[0040] In this case, if the multiple core members 22 are held in an annular shape solely by the elastic force of the C-shaped tolerance ring 20, there is a risk that the multiple core members 22 will fall apart if the tolerance ring 20 opens up against the elastic force of the tolerance ring 20.

[0041] On the other hand, as in the modification shown in FIG. 19, when a pair of circumferential end portions 40 are connected by a connecting portion 78, it is possible to suppress the transformer ring 20 from opening against the elastic force of the transformer ring 20. Therefore, the plurality of core members 22 can be held in a ring shape by the transformer ring 20. As a result, with the transformer ring 20 mounted on the plurality of core members 22, the transformer ring 20 and the plurality of core members 22 can be accommodated inside the case 18.

[0042] In addition, as in the modifications shown in FIGS. 20, 21, and 22, the connecting portion 78 may be formed by a caulked portion 84 that caulks a pair of circumferential end portions 40. Also, in this case, as in the modifications shown in FIGS. 20 and 21, the caulked portion 84 may be caulked so as to project radially inward (Y1 side) of the ring main body portion 30, or as in the modification shown in FIG. 22, it may be caulked so as to project radially outward (Y2 side) of the ring main body portion 30. Further, when the caulked portion 84 is caulked so as to project radially outward of the ring main body portion 30, a recess 86 for accommodating the caulked portion 84 may be formed on the inner peripheral surface 52 of the case 18.

[0043] Also, as in the modification shown in FIG. 23, the connecting portion 78 may be a bead portion 88 formed in a bead shape by welding a pair of circumferential end portions 40. Further, when the bead portion 88 is formed so as to project radially outward of the ring main body portion 30, a recess 90 for accommodating the bead portion 88 may be formed on the inner peripheral surface 52 of the case 18.

[0044] Also, as in the modification shown in FIG. 24, the connecting portion 78 may be formed by a caulked portion 90 that caulks a pair of circumferential end portions 40 in a state where they are overlapped by a pin-shaped punch 92.

[0045] Further, in the above embodiment, the plurality of protrusions 32 may be formed as follows. For example, in the modification shown in FIG. 25, the plurality of protrusions 32 each protrude radially inward of the tolerance ring 20. Even with such a configuration, similarly to the above embodiment, the fastening force of the tolerance ring 20 can be made uniform in the circumferential direction of the stator core 16, so that the roundness of the inner diameter of the stator core 16 can be improved.

[0046] Further, in the above embodiment, the stator core 16 is divided into a plurality of core members 22, and the plurality of core members 22 are configured independently of each other. However, the plurality of core members 22 may be rotatably connected by a rotary connection portion having the axial direction of the stator core 16 as a rotation axis. Further, instead of the plurality of core members 22 being rotatably connected by the rotary connection portion, a plurality of ins of insulators each attached to the plurality of core members 22 may be rotatably connected by the rotary connection portion. Further, the plurality of core members 22 may be integrally formed, and the plurality of insulators may also be integrally formed.

[0047] Further, the modifiable examples that can be combined among the plurality of modifiable examples may be combined and implemented as appropriate.

[0048] As described above, one embodiment of the technology of the present disclosure has been described. However, the present invention is not limited to the above, and it is needless to say that various modifications can be made without departing from the gist thereof.

[0049] The following are additional notes regarding the technology of the present disclosure. (Note 1) A rotating electric machine (10) comprising: a stator core (16); a case (18) housing the stator core; and a tolerance ring (20) provided between the stator core and the case along the circumferential direction of the stator core and fixing the stator core to the case, wherein the stator core has a plurality of teeth (24) extending radially inward toward the radial side of the stator core; and the tolerance ring has a plurality of projections (32) arranged in the circumferential direction of the tolerance ring, each projection protruding radially toward the tolerance ring, and the position of each projection is set to at least one of the positions on the center line (Lc) of each tooth portion and positions symmetrical with respect to the center line. (Note 2) The position of each projection is set within the range (R) between the intersection (P) of the outer circumferential surface (42) of the stator core and the extension line (Le) obtained by extending the sides (62) on both sides of each tooth portion in the radial direction of the stator core. (Note 3) The rotational electric machine according to Note 1 or Note 2, wherein the stator core has a locking portion (50), and the tolerance ring has a locked portion (36) that is locked to the locking portion. (Note 4) The rotational electric machine according to any one of Notes 1 to 3, wherein each projection has an inclined surface (58) that is inclined with respect to the axial direction of the tolerance ring. (Note 5) The tolerance ring has a pair of circumferential ends (40) divided in the circumferential direction of the tolerance ring by a dividing portion (38), and a connecting portion (78) that connects the pair of circumferential ends, as described in any one of Notes 1 to 4.

Claims

1. A rotating electric machine (10) comprising: a stator core (16); a case (18) housing the stator core; and a tolerance ring (20) provided between the stator core and the case along the circumferential direction of the stator core and fixing the stator core to the case, wherein the stator core has a plurality of teeth (24) extending radially inward toward the radial side of the stator core; and the tolerance ring has a plurality of projections (32) arranged in the circumferential direction of the tolerance ring, each projection protruding radially toward the tolerance ring, the position of each projection is set to at least one of the following: a position on the center line (Lc) of each tooth; and a position symmetrical with respect to the center line.

2. The position of each projection is set within a range (R) between the intersection (P) of the outer circumferential surface (42) of the stator core and the extension line (Le) obtained by extending the side surfaces (62) on both sides of each tooth portion in the radial direction of the stator core. The rotating electric machine according to claim 1.

3. The rotating electric machine according to claim 1 or claim 2, wherein the stator core has a locking portion (50), and the tolerance ring has a locked portion (36) that is locked to the locking portion.

4. The rotating electric machine according to any one of claims 1 to 3, wherein each of the projections has an inclined surface (58) that is inclined with respect to the axial direction of the tolerance ring.

5. The rotating electric machine according to any one of claims 1 to 4, wherein the tolerance ring has a pair of circumferential ends (40) divided in the circumferential direction of the tolerance ring by a dividing portion (38), and a connecting portion (78) that connects the pair of circumferential ends.

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