Stator assembly

Abstract

To restrain burrs, which are produced from a stator core and a housing, from flowing out when the stator core is press-fitted into the inside of the housing.SOLUTION: A stator assembly (1) comprises a housing (2) that is formed in a cylindrical shape, and a stator (10) that is stored on the inside of the housing. The stator has a stator core (18) with a plurality of tooth parts (28), which is press-fitted into the inside of the housing, an insulator (20) that is attached to the plurality of tooth parts, a coil (22) that has a plurality of wound parts (34) wound around the plurality of tooth parts via the insulator, and an insulator cover (16) for covering the plurality of wound parts from one side in an axial direction of the stator. The insulator cover has second opposed surfaces (16A and 36A) facing first opposed surfaces (2A and 4A) of the housing, and ribs (60 and 61) are arranged between the first and second opposed surfaces.SELECTED DRAWING: Figure 13

Description

[Technical field]

[0001] The present disclosure relates to a stator assembly for a rotating electric machine. [Background technology]

[0002] Examples of stators that can be applied to a stator assembly of a rotating electric machine include the following: Patent Document 1 discloses a stator (stator 1) that includes a plurality of teeth (teeth 4), an insulator (insulating member 7) attached to the plurality of teeth, a winding (winding 6) wound around the plurality of teeth via the insulator, and an insulator cover (insulating cover 9) that covers the winding from one axial side of the stator. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2010-045951 A Summary of the Invention [Problem to be solved by the invention]

[0004] Some rotating electric machines have a stator housed inside a cylindrical housing, and the housing and the stator form a stator assembly. The stator is fixed to the housing, for example, by pressing a stator core into the housing. However, when the stator core is pressed into the housing, burrs are generated from the stator core and the housing, and the burrs come into contact with the windings and scrape off the coating of the windings, which may cause insulation failure in the windings. Therefore, it is necessary to suppress the burrs generated from the stator core and the housing from flowing out.

[0005] An object of the present disclosure is to provide a stator assembly that can prevent burrs generated from a stator core and a housing from escaping when the stator core is press-fitted into the housing. [Means for solving the problem]

[0006] One aspect of the present disclosure is a stator assembly (1) for a rotating electric machine, comprising: a cylindrically formed housing (2); and a stator (10) accommodated inside the housing, the stator having a plurality of teeth (28); a stator core (18) pressed into the inside of the housing; an insulator (20) attached to the plurality of teeth; a winding (22) having a plurality of winding portions (34) wound around the plurality of teeth via the insulator; and an insulator cover (16) covering the plurality of winding portions from one axial side of the stator, the insulator cover having a second opposing surface (16A, 36A) opposing a first opposing surface (2A, 4A) of the housing, and ribs (60, 61) arranged between the first opposing surface and the second opposing surface. [Brief description of the drawings]

[0007] [Figure 1] FIG. 2 is an exploded perspective view of a stator assembly according to one embodiment of the present disclosure. [Diagram 2] FIG. [Diagram 3] FIG. [Figure 4] FIG. [Diagram 5] FIG. [Figure 6] FIG. 2 is a vertical cross-sectional view of the stator. [Figure 7] FIG. 2 is an exploded perspective view including an enlarged view of a main portion of the stator. [Figure 8] FIG. [Figure 9] FIG. 2 is an enlarged perspective view of a main portion of the insulator cover. [Figure 10] FIG. 2 is a side view showing a schematic view of a main portion of the insulator cover. [Figure 11] FIG. 2 is a side view including a schematic enlarged view of a main portion of the insulator cover. [Figure 12] FIG. 2 is a longitudinal sectional view including an enlarged view of a main portion of a stator assembly. [Figure 13] FIG. 2 is a schematic vertical cross-sectional view of a stator assembly. [Figure 14] FIG. 2 is a plan view including an enlarged view of a main portion of the insulator cover. [Figure 15] FIG. 4 is a side view showing a schematic diagram of a labyrinth passage; [Figure 16] FIG. 11 is an explanatory diagram showing a comparison of a stator according to a first modified example. [Figure 17] 13 is an explanatory view showing, for comparison, an insulator cover according to a second modified example. FIG. [Figure 18] FIG. 13 is a plan view including an enlarged view of a main portion of an insulator cover according to a third modified example. [Figure 19] FIG. 13 is an enlarged perspective view of a main portion of an insulator cover according to a fourth modified example. [Figure 20] FIG. 13 is a perspective view of an insulator cover according to a fifth modified example. [Figure 21] FIG. 13 is a perspective view of an insulator cover according to a sixth modified example. [Figure 22] FIG. 13 is an explanatory diagram showing, in comparison, the cross-sectional shapes of ribs according to the seventh modified example. [Diagram 23] FIG. 13 is an enlarged vertical cross-sectional view of a main portion of a stator assembly according to an eighth modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, an embodiment of the present disclosure will be described with reference to the drawings.

[0009] As shown in Fig. 1, a stator assembly 1 according to this embodiment includes a housing 2 and a stator 10. The housing 2 is formed in a cylindrical shape with a top, and has a top wall portion 4 and a peripheral wall portion 6. The stator 10 is accommodated inside the housing 2.

[0010] The stator 10 is a so-called split-core type stator. The basic configuration of a split-core type stator is described in Japanese Patent No. 5502115. The stator 10 is applied to an inner rotor type brushless motor, as an example of a rotating electric machine. That is, a rotor (not shown) is rotatably housed inside the stator 10, and the stator 10 and the rotor form a motor section of the brushless motor.

[0011] The stator 10 includes a plurality of stator components 12 and an insulator cover 16. The stator 10 has a U-phase, a V-phase, and a W-phase, and the number of the plurality of stator components 12 corresponds to the number of the U-phase, V-phase, and W-phase. That is, the stator 10 includes a U-phase stator component 12, a V-phase stator component 12, and a W-phase stator component 12. The plurality of stator components 12 are integrated by being assembled together in the axial direction of the stator 10. A stator main body 14 is formed by the plurality of stator components 12.

[0012] In each drawing, an arrow A1 indicates one axial side of the stator 10, and an arrow A2 indicates the other axial side of the stator 10.

[0013] 2 and 3, the stator 10 includes a stator body 14 and an insulator cover 16. As shown in FIG.

[0014] The stator core 18 is composed of a plurality of core constituent members 24 divided in the circumferential direction of the stator core 18. Each core constituent member 24 has a yoke constituent portion 26 and teeth portions 28. The yoke constituent portion 26 is a portion that constitutes a yoke 30, which is a portion on the outer circumferential side of the stator core 18. The teeth portions 28 extend from the yoke constituent portion 26 toward the inside in the radial direction of the stator core 18.

[0015] The insulator 20 has a plurality of insulating parts 32. Each insulating part 32 is attached to the tooth part 28, and covers the side surface of the tooth part 28 and the inner surface of the yoke constituent part 26. The winding 22 has a plurality of winding parts 34 wound around the plurality of teeth parts 28 via the insulator 20 (more specifically, each insulating part 32). As an example, each winding part 34 is wound around each tooth part 28 by a concentrated winding method.

[0016] 3, the insulator cover 16 is attached to the stator body 14 from one axial side of the stator 10. When attached to the stator body 14, the insulator cover 16 is configured to cover the multiple winding portions 34 from one axial side of the stator 10. The insulator cover 16 has a top wall portion 36 and a peripheral wall portion 38. The peripheral wall portion 38 is formed around the top wall portion 36 and extends from the top wall portion 36 toward the other axial side of the stator 10.

[0017] As shown in Figs. 5 and 6, the insulator cover 16 is attached to the insulator 20 by a plurality of snap-fit ​​structures 40. The plurality of snap-fit ​​structures 40 are provided on the outer periphery of the stator 10. The number of the plurality of snap-fit ​​structures 40 is set to a multiple of a divisor of the number of the plurality of teeth portions 28. In the present embodiment, as an example, the number of the plurality of teeth portions 28 (in other words, the number of slots between the plurality of teeth portions 28) is 12, and the number of the plurality of snap-fit ​​structures 40 is set to 3. Each snap-fit ​​structure 40 has a cantilever piece 42, a locking portion 44, and a locked portion 46.

[0018] The cantilever 42 extends in the circumferential direction of the stator 10 (the direction of the arrow R). The cantilever 42 is formed by a part of the peripheral wall 38 of the insulator cover 16. The cantilever 42 is separated from the top wall 36 over the entire length in the extension direction. One end of the cantilever 42 in the extension direction is a fixed end 42A, and the other end of the cantilever 42 in the extension direction is a free end 42B. The cantilever 42 is formed in an arc shape along the circumferential direction of the stator 10.

[0019] The locking portion 44 is formed on the free end 42B side of the cantilever 42. More specifically, the locking portion 44 is formed on the other axial end of the stator 10 in the free end 42B side of the cantilever 42 (see FIG. 6). The locking portion 44 is formed in a protrusion shape (in other words, a hook shape) that protrudes from the free end 42B of the cantilever 42 toward the inside in the radial direction of the stator 10.

[0020] The locked portion 46 is formed on the insulator 20. The locked portion 46 is formed in a protrusion shape that protrudes from the insulator 20 toward the outside in the radial direction of the stator 10. The locking portion 44 is locked to the locked portion 46 from the other axial side of the stator 10, so that the insulator cover 16 is prevented from coming off the insulator 20.

[0021] Let L [mm] be the length of the cantilever 42 along the circumferential direction of the stator 10, δ [mm] be the displacement of the cantilever 42 when the engaging portion 44 overcomes the engaged portion 46 during the process of assembling the insulator cover 16 to the insulator 20 from one axial side of the stator 10, E [MPa] be the Young's modulus of the cantilever 42, t [mm] be the plate thickness of the cantilever 42, and σ [Pa] be the stress acting on the fixed end 42A of the cantilever 42, then σ can be calculated using equation (1). σ=δEt / L 2 (1)

[0022] In this embodiment, the cantilever 42 of the snap-fit ​​structure 40 extends in the circumferential direction of the stator 10. Therefore, for example, the length of the cantilever 42 can be made longer than when the cantilever 42 extends in the axial direction of the stator 10. As a result, even if the cantilever 42 is deformed by the locking portion 44 climbing over the locked portion 46 during the process of assembling the insulator cover 16 to the insulator 20 from one axial side of the stator 10, the stress acting on the fixed end 42A of the cantilever 42 can be reduced.

[0023] The snap-fit ​​structures 40 include a first snap-fit ​​structure 40A having a cantilever 42 whose fixed end 42A is located on one side of the stator 10 in the circumferential direction relative to the free end 42B, and a second snap-fit ​​structure 40B having a cantilever 42 whose fixed end 42A is located on the other side of the stator 10 in the circumferential direction relative to the free end 42B. In this embodiment, as an example, the snap-fit ​​structures 40 include two first snap-fit ​​structures 40A and one second snap-fit ​​structure 40B. Each first snap-fit ​​structure 40A has the same configuration, and the first snap-fit ​​structure 40A and the second snap-fit ​​structure 40B have the same configuration except for the orientation. The multiple locking portions 44 are provided at equal intervals in the circumferential direction of the stator 10.

[0024] 7 and 8, the insulator cover 16 has an engaging portion 48, and the stator core 18 has an engaged portion 50. The engaging portion 48 is formed on the outer periphery of the insulator cover 16, and the engaged portion 50 is formed on the outer periphery of the stator core 18.

[0025] The engaging portion 48 is formed by a protrusion protruding from the insulator cover 16 toward the other axial side of the stator 10. As an example, the engaging portion 48 is formed in a rectangular prism shape, but may be formed in a cylindrical or wedge shape. A groove 52 is formed on the outer periphery of the stator core 18 (each core component 24), which opens radially outward of the stator 10 and extends in the axial direction of the stator 10, and the engaged portion 50 is formed by an opening formed at the end of the groove 52. The opening opens toward one axial side of the stator 10. When the insulator cover 16 is attached to the insulator 20 by the multiple snap-fit ​​structures 40, the engaging portion 48 engages with the engaged portion 50, so that the insulator cover 16 is positioned in the circumferential direction of the stator 10 relative to the insulator 20.

[0026] 9 and 10, a rib 60 is formed on the peripheral wall portion 38 of the insulator cover 16 (specifically, the outer circumferential surface 16A of the insulator cover 16). The rib 60 has a first rib 62 formed from the fixed end 42A to the free end 42B of the cantilever 42, a second rib 64 formed on a portion of the peripheral wall portion 38 other than the cantilever 42, and a third rib 66 formed on a portion of the cantilever 42 on the free end 42B side. The first rib 62, the second rib 64, and the third rib 66 all protrude from the peripheral wall portion 38 to the outside in the radial direction of the stator 10.

[0027] The first rib 62 and the second rib 64 extend in the circumferential direction of the stator 10, and the third rib 66 extends in the axial direction of the stator 10. The first rib 62 and the second rib 64 are continuous in the circumferential direction of the stator 10 except that they are separated at the free end 42B of the cantilever piece 42. The third rib 66 is formed from the first rib 62 to the end 16B of the insulator cover 16 on the stator core 18 side. The first rib 62 has a first portion 62A on the fixed end 42A side of the third rib 66 and a second portion 62B on the free end 42B side of the third rib 66.

[0028] The second rib 64 has a first parallel rib 64A and a second parallel rib 64B that are parallel to the circumferential direction of the stator 10, and an inclined rib 64C that is inclined with respect to the circumferential direction of the stator 10. The inclined rib 64C is formed between the first parallel rib 64A and the second parallel rib 64B. The inclined rib 64C is inclined toward one axial side of the stator 10 toward the second parallel rib 64B, so that the second parallel rib 64B is located on one axial side of the stator 10 with respect to the first parallel rib 64A.

[0029] The second parallel rib 64B faces the free end 42B of the cantilever piece 42 in the circumferential direction of the stator 10. The first parallel rib 64A is formed at the same position as the first rib 62 in the axial direction of the stator 10, and the second parallel rib 64B is located on one axial side of the stator 10 with respect to the first rib 62. The third rib 66 is located on the other axial side of the stator 10 with respect to the first rib 62. The third rib 66 is connected to the first rib 62. As shown in FIG. 11, the cross section of the rib 60 (the first rib 62, the second rib 64, and the third rib 66) is formed in a rectangular shape.

[0030] The first parallel rib 64A and the second parallel rib 64B are an example of a "parallel rib" in the present disclosure. The first rib 62 and the second rib 64 are an example of a "portion protruding in the radial direction of the stator" and a "portion extending in the circumferential direction of the stator" in the present disclosure. The third rib 66 is an example of a "portion protruding in the radial direction of the stator" and a "portion extending in the axial direction of the stator" in the present disclosure.

[0031] 12, the stator 10 is accommodated inside the housing 2, and the stator core 18 is press-fitted into the housing 2 to be fixed to the housing 2. When the stator 10 is accommodated inside the housing 2, an inner circumferential surface 2A of the housing 2 and an outer circumferential surface 16A of the insulator cover 16 face each other in the radial direction of the stator 10. The inner circumferential surface 2A of the housing 2 is an example of a "first opposing surface" in the present disclosure, and the outer circumferential surface 16A of the insulator cover 16 is an example of a "second opposing surface" in the present disclosure.

[0032] However, as described above, when the stator core 18 is press-fitted into the housing 2, burrs are generated from the stator core 18 and the housing 2, and the burrs come into contact with the windings 22 and scrape off the coating of the windings 22, which may cause insulation failure in the windings 22. Therefore, it is necessary to prevent the burrs generated from the stator core 18 and the housing 2 from leaking out. Therefore, in this embodiment, the insulator cover 16 is formed with ribs 60, which prevent the burrs from leaking out.

[0033] When the stator 10 is accommodated inside the housing 2, a rib 60 is disposed between the inner peripheral surface 2A of the housing 2 and the outer peripheral surface 16A of the insulator cover 16. The rib 60 may be press-fitted into the inside of the housing 2, may be in zero-touch contact with the inner peripheral surface 2A of the housing 2, or may have a gap between the rib 60 and the inner peripheral surface 2A of the housing 2. When the rib 60 has a gap between the rib 60 and the inner peripheral surface 2A of the housing 2, the dimension of the gap is preferably such that burrs do not escape.

[0034] As shown in FIG. 13, when the stator 10 is accommodated inside the housing 2, a closed space 70 is formed between the inner surface 2A of the housing 2 and the outer surface 16A of the insulator cover 16 by the first portion 62A of the first rib 62, which is closer to the fixed end 42A than the third rib 66, the third rib 66, and the stator core 18.

[0035] Furthermore, when the stator 10 is accommodated inside the housing 2, a labyrinth passage 72 is formed between the inner circumferential surface 2A of the housing 2 and the inner circumferential surface 2A of the insulator cover 16 by the second portion 62B of the first rib 62 closer to the free end 42B than the third rib 66, the second rib 62, the third rib 66, and the stator core 18. The gap between the first rib 62 and the second rib 64 in the axial direction of the stator 10 serves as an outlet 72A of the labyrinth passage 72. The outlet 72A of the labyrinth passage 72 faces the free end 42B of the cantilever piece 42 in the circumferential direction of the stator 10.

[0036] 14 and 15, in a state where a rotating electric machine to which the stator assembly 1 is applied is attached to an object so that the arrow Z side is vertically upward, the insulator cover 16 is disposed so that the outlets 72A of the labyrinth passages 72 open upward as indicated by the arrow UP. Specifically, the stator 10 including the insulator cover 16 is fixed to the housing 2 so that the dot product of the vector in the opening direction of the outlets 72A of the labyrinth passages 72 and the vector in the direction in which gravity acts is 0 or negative. In this way, the outlets 72A of the labyrinth passages 72 open in a direction that faces upward when the rotating electric machine to which the stator assembly 1 is applied is attached to an object.

[0037] Next, the effects of this embodiment will be described.

[0038] As described above in detail, in the stator assembly 1 according to this embodiment, the rib 60 is disposed between the inner circumferential surface 2A of the housing 2 and the outer circumferential surface 16A of the insulator cover 16. Therefore, the rib 60 can prevent burrs generated from the stator core 18 and the housing 2 when the stator core 18 is press-fitted into the housing 2 from flowing out. This can prevent the burrs from coming into contact with the winding 22 (specifically, the winding portion 34) and scraping off the coating of the winding 22, thereby preventing insulation defects from occurring in the winding 22.

[0039] In addition, since the ribs 60 can suppress the outflow of burrs, press fitting can be adopted as a method for fixing the stator core 18 to the housing 2. This eliminates the need to shrink fit the housing 2 to the stator core 18, and therefore the productivity of the stator assembly 1 can be improved compared to the case of shrink fitting.

[0040] Moreover, the ribs 60 are formed on the outer peripheral surface 16A of the insulator cover 16. Therefore, for example, the ribs 60 can be easily formed on the resin insulator cover 16, and therefore costs can be reduced compared to the case where the ribs 60 are formed on the metal housing 2.

[0041] Moreover, the rib 60 has a first rib 62 and a second rib 64. The first rib 62 and the second rib 64 protrude in the radial direction of the stator 10 and extend in the circumferential direction of the stator 10. Therefore, the first rib 62 and the second rib 64 can suppress the burrs from moving to one side in the axial direction of the stator 10.

[0042] Furthermore, the rib 60 has a third rib 66. The third rib 66 protrudes in the radial direction of the stator 10 and extends in the axial direction of the stator 10. Therefore, the third rib 66 can suppress the burrs from moving in the circumferential direction of the stator 10.

[0043] The first rib 62 is formed from the fixed end 42A to the free end 42B of the cantilever 42 and extends in the circumferential direction of the stator 10, and the third rib 66 is formed on the portion of the cantilever 42 on the free end 42B side and extends in the axial direction of the stator 10 from the first rib 62 to the end 16B of the insulator cover 16 on the stator core 18 side. A closed space 70 is formed between the inner peripheral surface 2A of the housing 2 and the outer peripheral surface 16A of the insulator cover 16 by the first portion 62A of the first rib 62 closer to the fixed end 42A than the third rib 66, the third rib 66, and the stator core 18. Therefore, the closed space 70 can suppress the outflow of burrs.

[0044] The second rib 64 is formed on a portion of the peripheral wall portion 38 of the insulator cover 16 other than the cantilever piece 42, and extends in the circumferential direction of the stator 10. A labyrinth flow path 72 is formed between the inner peripheral surface 2A of the housing 2 and the outer peripheral surface 16A of the insulator cover 16 by the second portion 62B of the first rib 62 closer to the free end 42B than the third rib 66, the second rib 64, the third rib 66, and the stator core 18. Therefore, the labyrinth flow path 72 can suppress the outflow of burrs.

[0045] Further, the second rib 64 has a first parallel rib 64A and a second parallel rib 64B that are parallel to the circumferential direction of the stator 10, and an inclined rib 64C that is inclined with respect to the circumferential direction of the stator 10. Therefore, the inclined rib 64C is inclined with respect to the first parallel rib 64A and the second parallel rib 64B, thereby increasing the rigidity of the second rib 64. As a result, even if the rib 60 is press-fitted into the inside of the housing 2, for example, deformation or damage of the second rib 64 can be suppressed.

[0046] In addition, the outlet 72A of the labyrinth passage 72 faces the free end 42B of the cantilever 42 in the circumferential direction of the stator 10. Therefore, the gap in the peripheral wall portion 38 formed by the free end 42B of the cantilever 42 is used as the outlet 72A of the labyrinth passage 72, so that the configuration of the peripheral wall portion 38 can be simplified.

[0047] The number of the snap-fit ​​structures 40 is, for example, three, and the snap-fit ​​structures 40 include a first snap-fit ​​structure 40A having a cantilever 42 whose fixed end 42A is located on one circumferential side of the stator 10 relative to the free end 42B, and a second snap-fit ​​structure 40B having a cantilever 42 whose fixed end 42A is located on the other circumferential side relative to the free end 42B. Therefore, for example, when the stator 10 is arranged so that the arrow Z side is vertically upward, the free end 42B of each cantilever 42 and the adjacent outlet 72A of each labyrinth flow path 72 can be directed upward as shown by the arrow UP. This makes it possible to more effectively prevent burrs from flowing out from the outlet 72A of the labyrinth flow path 72.

[0048] Moreover, the cantilever 42 extends in the circumferential direction of the stator 10. Therefore, for example, the length of the cantilever 42 can be made longer than when the cantilever 42 extends in the axial direction of the stator 10. As a result, even if the cantilever 42 is deformed as the engaging portion 44 overcomes the engaged portion 46 during the process of assembling the insulator cover 16 to the insulator 20 from one axial side of the stator 10, the stress acting on the fixed end 42A of the cantilever 42 can be reduced, and therefore damage to the fixed end 42A of the cantilever 42 can be suppressed.

[0049] In other words, the stress acting on the fixed end 42A of the cantilever 42 is inversely proportional to the square of the length of the cantilever 42, so by extending the cantilever 42 in the circumferential direction of the stator 10 and increasing the length of the cantilever 42, the stress acting on the fixed end 42A of the cantilever 42 can be reduced, thereby preventing damage to the fixed end 42A of the cantilever 42.

[0050] Furthermore, for example, when the cantilever 42 extends in the axial direction of the stator 10, if the deformation amount of the cantilever 42 increases due to axial misalignment of the insulator cover 16 with respect to the insulator 20, the stress acting on the fixed end 42A of the cantilever 42 increases, and therefore positioning accuracy of the insulator cover 16 is required. However, as in this embodiment, when the cantilever 42 extends in the circumferential direction of the stator 10, even if the deformation amount of the cantilever 42 increases due to axial misalignment of the insulator cover 16 with respect to the insulator 20, the increase in the stress acting on the fixed end 42A of the cantilever 42 can be suppressed, and therefore the requirement for positioning accuracy of the insulator cover 16 can be avoided.

[0051] In addition, the cantilever 42 is formed in an arc shape along the circumferential direction of the stator 10. This allows the length of the cantilever 42 to be longer than when the cantilever 42 is formed in a straight line along the tangential direction of the stator 10, for example, and therefore the stress acting on the fixed end 42A of the cantilever 42 can be reduced.

[0052] Furthermore, the stator 10 includes a plurality of snap-fit ​​structures 40, and the number of the plurality of snap-fit ​​structures 40 is a multiple of a divisor of the number of the plurality of teeth portions 28. This makes it possible to prevent the locked portion 46 from being positioned in a slot between the teeth portions 28, and allows the locked portion 46 to be formed in a portion of the insulator 20 corresponding to the teeth portions 28 (i.e., the insulating portion 32).

[0053] Moreover, the multiple locking portions 44 are provided at equal intervals in the circumferential direction of the stator 10. This makes it possible to equalize the stress acting on each of the locking portions 44. This makes it possible to prevent stress from concentrating on any one of the locking portions 44.

[0054] Furthermore, the insulator cover 16 has engaging portions 48 which are protrusions that protrude in the axial direction of the stator 10, and the stator core 18 has engaged portions 50 which engage with the engaging portions 48. Therefore, when the insulator cover 16 is assembled to the insulator 20 by the plurality of snap-fit ​​structures 40, the insulator cover 16 can be positioned in the circumferential direction of the stator 10 relative to the insulator 20 by engaging the engaging portions 48 with the engaged portions 50. This improves the workability when assembling the insulator cover 16 to the insulator 20 by the plurality of snap-fit ​​structures 40.

[0055] In addition, the snap-fit ​​structure 40 is provided on the outer periphery of the stator 10. As a result, the length of the cantilever 42 can be made longer than in the case where the snap-fit ​​structure 40 is provided on the inner periphery of the stator 10, and therefore the stress acting on the fixed end 42A of the cantilever 42 can be reduced.

[0056] Next, a modification of this embodiment will be described.

[0057] (First Modification) In the above embodiment, the insulator cover 16 is fixed to the insulator 20 by a snap-fit ​​structure 40 having a cantilever 42 extending in the circumferential direction of the stator 10, but may be fixed to the insulator 20 by other structures. For example, in the example shown in FIG. 16(A), the insulator cover 16 is fixed to the insulator 20 by a snap-fit ​​structure 40 having a cantilever 42 extending in the axial direction of the stator 10. In the example shown in FIG. 16(B), the insulator cover 16 is fixed to the insulator 20 by a molding material 80. In the example shown in FIG. 16(C), the insulator cover 16 is fixed to the insulator 20 by press-fitting the insulator 20 into the inside of the insulator cover 16.

[0058] (Second Modification) Furthermore, in the above embodiment, the number of the snap-fit ​​structures 40 is three, but there may be any number of the snap-fit ​​structures 40. For example, in the example shown in Fig. 17(A), the number of the snap-fit ​​structures 40 is two, and in the example shown in Fig. 17(B), the number of the snap-fit ​​structures 40 is four.

[0059] When the number of the snap-fit ​​structures 40 is two or three, the number of outlets 72A of the labyrinth flow path 72 is smaller than when the number of the snap-fit ​​structures 40 is four, so that the effect of suppressing the outflow of burrs can be enhanced. On the other hand, when the number of the snap-fit ​​structures 40 is three or four, the number of the snap-fit ​​structures 40 is greater than when the number of the snap-fit ​​structures 40 is two, so that the insulator cover 16 can be firmly fixed to the insulator 20. When the number of the snap-fit ​​structures 40 is three, it is possible to achieve both the effect of suppressing the outflow of burrs and the fixing force of the insulator cover 16.

[0060] In the examples shown in FIGS. 17(A) and (B), the outlets 72A (see FIG. 14) of the labyrinth channels 72 are both disposed so as to open upward as indicated by the arrows UP.

[0061] (Third Modification) In the above embodiment, the outlets 72A of the labyrinth passages 72 all open in an upward direction when the rotating electric machine is attached to the target object, but for example, as shown in Fig. 18, the outlet 72A of the labyrinth passage 72 located on the lower side in the vertical direction among the multiple labyrinth passages 72 may open in a horizontal direction as shown by arrow H when the rotating electric machine is attached to the target object. Even if the outlet 72A of the labyrinth passage 72 opens horizontally, the effect of suppressing the outflow of burrs can be obtained.

[0062] (Fourth Modification) In the above embodiment, the rib 60 has the first rib 62, the second rib 64, and the third rib 66, but may have other ribs. For example, in the example shown in FIG. 19, the rib 60 has a fourth rib 82. The fourth rib 82 is connected to the second rib 64 and is formed at a position to block the outlet 72A of the labyrinth passage 72. With this configuration, it is possible to enhance the effect of suppressing burrs from flowing out from the outlet 72A of the labyrinth passage 72. The fourth rib 82 may be formed on the free end 42B of the cantilever 42. In this case, the fourth rib 82 is also formed at a position to block the outlet 72A of the labyrinth passage 72, so that it is possible to enhance the effect of suppressing burrs from flowing out from the outlet 72A of the labyrinth passage 72. The fourth rib 82 is an example of a "portion protruding in the radial direction of the stator" and a "portion extending in the axial direction of the stator" in the present disclosure.

[0063] (Fifth Modification) As shown in FIG. 20, the rib 60 may be a circular rib formed around the entire periphery of the peripheral wall portion 38 of the insulator cover 16 .

[0064] (Sixth Modification) As shown in FIG. 21, the rib 60 may be a divided rib formed intermittently on the peripheral wall portion 38 of the insulator cover 16.

[0065] (Seventh Modification) In addition, in the above embodiment, the cross-sectional shape of the rib 60 is rectangular, but it may be semicircular as shown in FIG. 22(A), triangular as shown in FIG. 22(B), or trapezoidal as shown in FIG. 22(C).

[0066] (Eighth Modification) In the above embodiment, the rib 60 is disposed between the inner peripheral surface 2A of the housing 2 and the outer peripheral surface 16A of the insulator cover 16, but the rib may be disposed at other positions. For example, in the example shown in FIG. 23, a rib 61 protruding to one axial side of the stator 10 is also formed on the outer peripheral portion of the top wall portion 36 of the insulator cover 16, and the rib 61 is disposed between the back surface 4A of the top wall portion 4 of the housing 2 and the front surface 36A of the top wall portion 36 of the insulator cover 16. When the ribs 60 and 61 are formed on the insulator cover 60 in this manner, the effect of suppressing the outflow of burrs can be improved. The rib 61 added in the example shown in FIG. 23 is an example of an "axially protruding portion" in the present disclosure. The back surface 4A of the top wall portion 4 of the housing 2 is an example of a "first opposing surface" in the present disclosure, and the front surface 36A of the top wall portion 36 of the insulator cover 16 is an example of a "second opposing surface" in the present disclosure.

[0067] 23, the rib 60 formed on the peripheral wall portion 38 of the insulator cover 16 may be omitted. Even in this configuration, the rib 61 formed on the top wall portion 36 of the insulator cover 16 can prevent burrs from escaping.

[0068] In addition, the rib 61 is formed on the insulator cover 16, but may be formed on the housing 2, or may be formed on both the housing 2 and the insulator cover 16. Similarly, in the above embodiment, the rib 60 is formed on the insulator cover 16, but may be formed on the housing 2, or may be formed on both the housing 2 and the insulator cover 16.

[0069] Among the above multiple modified examples, modified examples that can be combined may be combined as appropriate.

[0070] While one embodiment of the present disclosure has been described above, the present disclosure is not limited to the above, and it goes without saying that the present disclosure can be implemented in various modified forms without departing from the spirit and scope of the present disclosure.

[0071] With respect to the present disclosure, the following notes are disclosed. (Appendix 1) A stator assembly (1) for a rotating electric machine, comprising: A cylindrically formed housing (2); A stator (10) accommodated inside the housing; Equipped with The stator includes: a stator core (18) having a plurality of teeth (28) and press-fitted into the housing; an insulator (20) attached to the plurality of teeth portions; a winding (22) having a plurality of winding portions (34) wound around the plurality of teeth portions via the insulator; an insulator cover (16) that covers the plurality of winding portions from one axial side of the stator; Equipped with the insulator cover has a second opposing surface (16A, 36A) opposing the first opposing surface (2A, 4A) of the housing, Ribs (60, 61) are disposed between the first opposing surface and the second opposing surface. Stator assembly. (Appendix 2) The rib is formed on the second opposing surface. 2. The stator assembly of claim 1. (Appendix 3) The rib has at least one of a portion (62, 64, 66) protruding in a radial direction of the stator, a portion (61) protruding in an axial direction of the stator, a portion (62, 64) extending in a circumferential direction of the stator, and a portion (66, 82) extending in an axial direction of the stator. 3. The stator assembly according to claim 1 or 2. (Appendix 4) The insulator cover is attached to the insulator by a snap-fit ​​structure (40), The snap-fit ​​structure is Formed by a part of the peripheral wall of the insulator cover, extending in the circumferential direction of the stator as the extending direction, with one end in the extending direction being the fixed end (42A) and the other end in the extending direction being the free end (42B), a cantilever piece (42); A locking portion (44) formed on the portion on the free end side of the cantilever piece; A locked portion (46) formed on the insulator and locked by the locking portion from the other side in the axial direction of the stator; Having The stator assembly according to any one of Appendices 1 to 3. (Appendix 5) The first opposing surface is the inner peripheral surface (2A) of the housing; The second opposing surface is the outer peripheral surface (16A) of the insulator cover; The rib A first rib (62) formed from the fixed end to the free end of the cantilever piece and extending in the circumferential direction of the stator; A second rib (64) formed on the portion of the peripheral wall of the insulator cover other than the cantilever piece and extending in the circumferential direction of the stator; A third rib (66) formed on the portion on the free end side of the cantilever piece and extending in the axial direction of the stator from the first rib to the end on the stator core side of the insulator cover; Having The stator assembly according to Appendix 4. (Appendix 6) The second rib Parallel ribs (64A, 64B) parallel to the circumferential direction of the stator; Inclined ribs (64C) inclined with respect to the circumferential direction of the stator; Having The stator assembly according to Appendix 5. (Appendix 7) A first portion (62A) of the first rib on the fixed end side of the third rib, the third rib, and the stator core form a closed space 70 between the inner peripheral surface of the housing and the outer peripheral surface of the insulator cover; a second portion (62B) of the first rib closer to the free end than the third rib, the second rib, the third rib, and the stator core form a labyrinth flow path (72) between an inner peripheral surface of the housing and an outer peripheral surface of the insulator cover. 7. The stator assembly according to claim 5 or 6. (Appendix 8) An outlet of the labyrinth passage faces the free end in a circumferential direction of the stator. 8. The stator assembly of claim 7. (Appendix 9) A plurality of said snap-fit ​​structures are provided, The plurality of snap-fit ​​structures include a first snap-fit ​​structure (40A) having the cantilever piece, the fixed end of which is located on one side of the stator in the circumferential direction relative to the free end; a second snap-fit ​​structure (40B) having the cantilever piece, the fixed end of which is located on the other circumferential side of the stator relative to the free end; Including, The outlet of the labyrinth flow path opens in a horizontal or upward direction when the rotating electric machine is attached to an object. 9. The stator assembly of claim 8. (Appendix 10) The rib has a fourth rib (82) formed at a position to block the outlet of the labyrinth passage. 10. The stator assembly according to any one of claims 7 to 9. [Explanation of symbols]

[0072] 1... stator assembly, 2... housing, 2A... inner peripheral surface, 4... top wall portion, 4A... back surface, 6... peripheral wall portion, 10... stator, 12... stator component, 14... stator body, 16... insulator cover, 16A... outer peripheral surface, 16B... end portion, 18... stator core, 20... insulator, 22... winding, 24... core component, 26... yoke component, 28... teeth portion, 30... yoke, 32... insulating portion, 34... winding portion, 36... top wall portion, 36A... surface, 38... peripheral wall portion, 40... snap-fit ​​structure, 40A... th 1 snap-fit ​​structure, 40B...second snap-fit ​​structure, 42...cantilever, 42A...fixed end, 42B...free end, 44...engaging portion, 46...engaged portion, 48...engaging portion, 50...engaged portion, 52...groove, 60...rib, 60...insulator cover, 62...first rib, 62A...first portion, 62B...second portion, 64...second rib, 64A...first parallel rib, 64B...second parallel rib, 64C...inclined rib, 66...third rib, 70...closed space, 72...labyrinth flow path, 72A...outlet, 80...molding material, 82...rib

Claims

1. A stator assembly (1) for a rotating electric machine, comprising: A cylindrically formed housing (2); A stator (10) accommodated inside the housing; Equipped with The stator includes: a stator core (18) having a plurality of teeth (28) and press-fitted into the housing; an insulator (20) attached to the plurality of teeth portions; a winding (22) having a plurality of winding portions (34) wound around the plurality of teeth portions via the insulator; an insulator cover (16) that covers the plurality of winding portions from one axial side of the stator; Equipped with the insulator cover has a second opposing surface (16A, 36A) opposing the first opposing surface (2A, 4A) of the housing, Ribs (60, 61) are disposed between the first opposing surface and the second opposing surface. Stator assembly.

2. The rib is formed on the second opposing surface. The stator assembly of claim 1 .

3. The rib has at least one of a portion (62, 64, 66) protruding in a radial direction of the stator, a portion (61) protruding in an axial direction of the stator, a portion (62, 64) extending in a circumferential direction of the stator, and a portion (66, 82) extending in the axial direction of the stator. The stator assembly of claim 1 .

4. The insulator cover is attached to the insulator by a snap-fit ​​structure (40); The snap-fit ​​structure is a cantilever (42) formed by a part of a peripheral wall portion of the insulator cover, extending in a circumferential direction of the stator, one end of the cantilever in the extending direction being a fixed end (42A) and the other end of the cantilever in the extending direction being a free end (42B); A locking portion (44) formed on the free end side portion of the cantilever; a locked portion (46) formed on the insulator, the locking portion being locked from the other axial side of the stator; having The stator assembly of claim 1 .

5. The first opposing surface is an inner circumferential surface (2A) of the housing, the second opposing surface is an outer circumferential surface (16A) of the insulator cover, The rib is a first rib (62) formed from the fixed end to the free end of the cantilever and extending in a circumferential direction of the stator; a second rib (64) formed on a portion of the peripheral wall of the insulator cover other than the cantilever piece and extending in a circumferential direction of the stator; a third rib (66) formed on the free end of the cantilever and extending in the axial direction of the stator from the first rib to an end of the insulator cover on the stator core side; having The stator assembly of claim 4 .

6. The second rib is Parallel ribs (64A, 64B) parallel to the circumferential direction of the stator; An inclined rib (64C) inclined with respect to the circumferential direction of the stator; having The stator assembly of claim 5 .

7. a first portion (62A) of the first rib closer to the fixed end than the third rib, the third rib, and the stator core form a closed space 70 between an inner peripheral surface of the housing and an outer peripheral surface of the insulator cover, a second portion (62B) of the first rib closer to the free end than the third rib, the second rib, the third rib, and the stator core form a labyrinth flow path (72) between an inner peripheral surface of the housing and an outer peripheral surface of the insulator cover. The stator assembly of claim 5 .

8. An outlet of the labyrinth passage faces the free end in a circumferential direction of the stator. The stator assembly of claim 7.

9. A plurality of said snap-fit ​​structures are provided, The plurality of snap-fit ​​structures include A first snap-fit ​​structure (40A) having the cantilever piece, the fixed end of which is located on one side of the stator in the circumferential direction relative to the free end; A second snap-fit ​​structure (40B) having the cantilever piece, the fixed end of which is located on the other circumferential side of the stator relative to the free end; Including, The outlet of the labyrinth flow path opens in a horizontal or upward direction when the rotating electric machine is attached to an object. The stator assembly of claim 8 .

10. The rib has a fourth rib (82) formed at a position to block the outlet of the labyrinth passage. The stator assembly of claim 7.

Images