Motor

Abstract

The invention relates to a motor. The motor includes a stator core, a housing, and a guide ring. The housing has a facing portion facing an end face of the stator core. The guide ring is sandwiched between the end surface and the facing portion. A space surrounded by the inner surface of the housing, the outer peripheral surface of the guide ring, and the end surface forms an annular cooling liquid flow path. A plurality of in-core cooling liquid flow paths are provided inside the stator core. An inflow port of each of the in-core coolant flow paths opens in the end surface at a position further outward than the guide ring in the radial direction. And the flow inlet of each in-core cooling liquid flow path is connected with the annular cooling liquid flow path.

Description

Technical Field

[0001] The technology disclosed in this specification relates to a motor. Background Art

[0002] The motor disclosed in Japanese Patent Laid-Open No. 2017-204980 has a housing, a stator core and a guide ring. The stator core and the guide ring are housed in a cylindrical housing. The guide ring has a base in contact with the end face of the stator core and an annular protrusion extending radially outward from the base. A gap is provided between the annular protrusion and the end face of the stator core. The outer peripheral surface of the stator core and the outer peripheral surface of the annular protrusion are in contact with the inner peripheral surface of the housing. An annular coolant flow path is formed by the space surrounded by the stator core, the guide ring and the housing. In addition, a plurality of core coolant flow paths are provided inside the stator core. The inlet of each core coolant flow path is connected to the annular coolant flow path. When coolant (e.g., oil) is supplied to the annular coolant flow path from the outside of the housing, the coolant flows from the annular flow path to each core coolant flow path. Thus, the stator core is cooled from the inside. Summary of the invention

[0003] In the motor of Japanese Patent Publication No. 2017-204980, the outer peripheral surface of the guide ring (i.e., the outer peripheral surface of the annular protrusion) contacts the inner peripheral surface of the housing. Therefore, if the diameters and roundnesses of the inner peripheral surface of the housing and the outer peripheral surface of the guide ring are not accurate, a gap will be generated between the housing and the guide ring. If a gap is generated between the housing and the guide ring, problems such as reduced shape accuracy of the motor as a whole or leakage of coolant in the annular flow path will occur. In addition, when the inner peripheral surface of the housing and the outer peripheral surface of the guide ring are processed with high precision so that no gap is generated between the housing and the guide ring, problems such as increased processing costs and difficulty in inserting the guide ring into the housing will arise. In this specification, a technology is proposed that can easily and appropriately configure the guide ring in the housing of the motor.

[0004] The first method disclosed in the present invention is a motor. The motor includes: a stator core; a housing, the housing accommodates the stator core; and a guide ring, the guide ring is accommodated in the housing, has a ring shape extending around the motor shaft, and is sandwiched between the end face and the facing portion. The housing has the facing portion facing one of the end faces of the stator core. An annular coolant flow path is formed by a space surrounded by the inner surface of the housing, the outer peripheral surface of the guide ring, and the end face. A plurality of in-core coolant flow paths are provided inside the stator core. The inlet of each in-core coolant flow path opens on the end face at a position radially outside the guide ring. The inlet of each in-core coolant flow path is connected to the annular coolant flow path.

[0005] It should be noted that, in this specification, the radial direction refers to the direction along the radius of a circle centered on the motor shaft.

[0006] In the motor of the first embodiment of the present disclosure, the guide ring is fixed by being sandwiched between the end face of the stator core and the facing portion of the housing in the axial direction (i.e., in the direction parallel to the motor shaft). The guide ring can be easily fixed by stacking the facing portion, the guide ring, and the stator core in the axial direction. In addition, by stacking in this way, the gap between the guide ring and the housing can be suppressed regardless of the shape accuracy of the guide ring. In this way, according to the structure of the motor, the guide ring can be easily and appropriately arranged in the housing of the motor.

[0007] The motor of the first embodiment of the present disclosure may also include a coil, which is wound on the stator core at a position inside the guide ring in the radial direction. Each of the in-core coolant flow paths includes: a first flow path, which is arranged at a position outside the guide ring in the radial direction and connected to the inlet; a second flow path, which extends from a position outside the guide ring to a position inside the guide ring in the radial direction and is connected to the first flow path; and a third flow path, which is arranged at a position inside the guide ring in the radial direction, extends along the axial direction, and is connected to the second flow path.

[0008] In the motor according to the first aspect of the present disclosure, each of the second flow paths may extend along the radial direction.

[0009] In the motor according to the first aspect of the present disclosure, the coil can be cooled efficiently.

[0010] In the motor of the first mode of the present disclosure, the stator core may also be composed of a plurality of electromagnetic steel plates stacked in the axial direction. The plurality of electromagnetic steel plates may also include a first electromagnetic steel plate, a second electromagnetic steel plate, and a third electromagnetic steel plate. A first through hole arranged at a position outside the guide ring in the radial direction may also be provided on the first electromagnetic steel plate existing in the range including the end face. A second through hole extending along the radial direction may also be provided on the second electromagnetic steel plate adjacent to the first electromagnetic steel plate. A third through hole may also be provided on the third electromagnetic steel plate adjacent to the second electromagnetic steel plate. The third through hole may be arranged at a position inside the guide ring in the radial direction. The first flow path may also be formed by the first through hole. The second flow path may also be formed by the second through hole. The third flow path may also be formed by the third through hole.

[0011] According to the motor of the first aspect of the present disclosure, the core coolant flow path can be easily formed.

[0012] In the motor of the first aspect of the present disclosure, the stator core may also include a back yoke and a plurality of teeth protruding inward from the back yoke in the radial direction. The coil may also be wound around the plurality of teeth. The third flow path may also be provided inside the corresponding teeth.

[0013] In the motor according to the first aspect of the present disclosure, the third flow path may be provided at a boundary of the teeth corresponding to the back yoke.

[0014] According to the motor of the first aspect of the present disclosure, the coil can be cooled efficiently.

[0015] In the motor of the first aspect of the present disclosure, a coil end may be provided on the end surface. The inner diameter of the guide ring may be larger than the outer diameter of the coil end.

[0016] According to the motor of the first aspect of the present disclosure, the guide ring can be attached to the stator core in a state where the coil is provided.

[0017] In the motor of the first aspect of the present disclosure, a coil end may be provided at an inner side of the guide ring in the radial direction. The guide ring may be provided with a coolant discharge flow path penetrating the guide ring in the radial direction.

[0018] According to the motor of the first aspect of the present disclosure, the coil end can be cooled efficiently.

[0019] According to the motor of the first aspect of the present disclosure, the housing may include a contact portion that contacts the end surface, and a sealing member may be provided at an interface between the end surface and the contact portion.

[0020] According to the motor of the first aspect of the present disclosure, the coolant can be efficiently supplied to the coolant flow path in the core.

[0021] According to the motor of the first aspect of the present disclosure, a recessed portion may be provided on the inner peripheral surface of the housing.

[0022] According to the motor of the first aspect of the present disclosure, even if the recessed portion is provided on the inner peripheral surface of the housing, the guide ring can be appropriately provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Features, advantages, and technical and industrial significance of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings, in which like reference numerals represent like elements, and in which:

[0024] Figure 1 It is an exploded perspective view of the motor of the embodiment.

[0025] Figure 2 is a partial cross-sectional view of the motor of the embodiment.

[0026] Figure 3 This is a top view of the stator along the axial direction.

[0027] Figure 4 is an enlarged cross-sectional view of the guide ring and its surroundings.

[0028] Figure 5 This is an exploded perspective view of the stator core.

[0029] Figure 6 It is an enlarged plan view of the electromagnetic steel plate 36d.

[0030] Figure 7 It is an enlarged plan view of an electromagnetic steel sheet 36d of the motor according to the first modification.

[0031] Figure 8 It is an enlarged plan view of an electromagnetic steel sheet 36d of a motor according to a second modification.

[0032] Fig. 9 It is an enlarged plan view of an electromagnetic steel sheet 36d of a motor according to a third modification.

[0033] Fig.10 It is an enlarged plan view of an electromagnetic steel sheet 36 a of a motor according to a fourth modification.

[0034] Fig.11 It is an enlarged plan view of an electromagnetic steel sheet 36d of a motor according to a fifth modification. DETAILED DESCRIPTION

[0035] Embodiments of the present disclosure will be described with reference to the drawings. It should be noted that the embodiments described below are merely examples of specific embodiments of the present disclosure and do not limit the present disclosure.

[0036] Figure 1 , 2 The motor 10 of the illustrated embodiment has a rotor 20, a stator 30, and a housing 50. The rotor 20 has a shaft 24. The stator 30 has a cylindrical shape. The rotor 20 is arranged in the center hole of the stator 30 in such a manner that the center axis of the shaft 24 coincides with the center axis of the stator 30. The rotor 20 and the stator 30 are accommodated in the housing 50. Hereinafter, the direction parallel to the rotation axis of the motor 10 (i.e., the center axis of the shaft 24) is referred to as an axial direction, and the direction along the radius of a circle centered on the rotation axis of the motor 10 is referred to as a radial direction.

[0037] The housing 50 has a so-called bottomed cylindrical shape and has an outer peripheral wall 52 and a partition wall 54. The outer peripheral wall 52 has a cylindrical shape. The partition wall 54 is provided at one end portion in the axial direction of the outer peripheral wall 52. A through hole 54a is provided at the center of the partition wall 54.

[0038] The stator 30 has a stator core 32 and a coil 40. Figure 2, the coil 40 is simplified. The stator core 32 has a cylindrical shape. The coil 40 is wound on the stator core 32 (more specifically, the teeth 34 described later). The stator core 32 has an end face 32a, an end face 32b, and an outer peripheral surface 32c. The end face 32a is an axial end face of the stator core 32, and the end face 32b is an end face on the side opposite to the end face 32a. A coil end 42a is provided on the end face 32a. A coil end 42b is provided on the end face 32b. The coil ends 42a and 42b are bent portions of the coil 40 wound on the stator core 32. The coil end 42a protrudes from the end face 32a, and the coil end 42b protrudes from the end face 32b. As shown in FIG. Figure 3 As shown, the coil ends 42a are distributed in a ring shape on the end surface 32a. Similarly, the coil ends 42b are distributed in a ring shape on the end surface 32b.

[0039] like Figure 1 , 2 As shown, the inner surface 52a of the outer peripheral wall 52 of the housing 50 has a cylindrical shape extending along the outer peripheral surface 32c of the stator core 32. The inner surface 52a of the outer peripheral wall 52 faces the outer peripheral surface 32c of the stator core 32. The partition wall 54 of the housing 50 faces the end surface 32a of the stator core 32. The partition wall 54 is an example of a facing portion. Figure 2 As shown in FIG. 5 , a gap is provided between the partition wall 54 and the end surface 32a of the stator core 32, and the coil end 42a is arranged in the gap. Figure 1 As shown, a plurality of convex portions 38 are provided on the outer peripheral surface 32c of the stator core 32. In addition, a plurality of concave portions 58 are provided on the inner surface 52a of the outer peripheral wall 52. The stator core 32 is accommodated in the housing 50 in such a manner that each convex portion 38 is arranged in the corresponding concave portion 58. A bolt fastening hole extending in the axial direction is provided on each convex portion 38. A bolt 49 is inserted into each bolt fastening hole. The stator core 32 is fastened to the housing 50 by the bolt 49.

[0040] The rotor 20 is disposed in the center hole of the stator core 32 in a state concentric with the stator core 32. The shaft 24 of the rotor 20 is inserted into the through hole 54a of the housing 50. The rotor 20 is rotatably supported in the housing 50 by bearings and the like.

[0041] like Figure 1 , 2 As shown, the motor 10 has a guide ring 60. The guide ring 60 has a ring shape. Figure 3 As shown, the outer diameter of the guide ring 60 (i.e., the diameter of the largest diameter portion) is smaller than the diameter of the outer peripheral surface 32c of the stator core 32. The inner diameter of the guide ring 60 (i.e., the diameter of the smallest diameter portion) is larger than the outer diameter of the coil end 42a. Figure 1 , 2As shown, the guide ring 60 is housed within the housing 50. The guide ring 60 is configured to extend annularly around the axis of the motor 10 (i.e., the axis 24). The guide ring 60 is disposed in a concentric state with the rotor 20 and the stator core 32 between the end face 32a of the stator core 32 and the partition wall 54 of the housing 50. The guide ring 60 is fixed by being sandwiched between the end face 32a and the partition wall 54. The coil end 42a is disposed at a position radially inside the guide ring 60. The guide ring 60 divides the space between the stator core 32 and the partition wall 54 into an outer peripheral side space 56 and an inner peripheral side space 57. The outer peripheral side space 56 is a space surrounded by the inner surface of the housing 50, the outer peripheral surface of the guide ring 60, and the end face 32a, and has an annular shape. Hereinafter, the outer peripheral side space 56 will be referred to as the annular coolant flow path 56.

[0042] As Figure 4 shown, one end of the guide ring 60 contacts the end face 32a of the stator core 32. An O-ring 66 is provided at the connection portion between the guide ring 60 and the end face 32a. The connection portion between the guide ring 60 and the end face 32a is sealed by the O-ring 66. It should be noted that other sealing members (for example, a metal gasket, a liquid gasket, etc.) may be provided instead of the O-ring 66. In addition, in Figure 4 this case, the guide ring 60 contacts the end face 32a, but it may also be a structure in which the guide ring 60 is connected to the end face 32a via a sealing member (i.e., the guide ring 60 itself does not contact the end face 32a). The other end of the guide ring 60 contacts the partition wall 54. An O-ring 68 is provided at the connection portion between the guide ring 60 and the partition wall 54. The connection portion between the guide ring 60 and the partition wall 54 is sealed by the O-ring 68. It should be noted that other sealing members (for example, a metal gasket, a liquid gasket, etc.) may be provided instead of the O-ring 68. In addition, in Figure 4 this case, the guide ring 60 contacts the partition wall 54, but it may also be a structure in which the guide ring 60 is connected to the partition wall 54 via a sealing member (i.e., the guide ring 60 itself does not contact the partition wall 54).

[0043] A stepped portion 59 is provided on the inner surface 52a of the housing 50. The stepped portion 59 is provided over the entire circumferential region. The end face 32a of the stator core 32 contacts the stepped portion 59 in the axial direction. The stepped portion 59 is an example of a contact portion. The end face 32a is in close contact with the stepped portion 59. It should be noted that a sealing member (for example, an O-ring, a metal gasket, a liquid gasket, etc.) may be provided at the interface between the end face 32a and the stepped portion 59.

[0044] A coolant supply path 53a is provided on the housing 50. The coolant supply path 53a connects the outside of the housing 50 to the annular coolant flow path 56. As Figure 2As shown, a coolant discharge path 53b is provided at the lower part of the housing 50. The coolant discharge path 53b connects the inside and the outside of the housing 50. The coolant discharge path 53b is connected to the coolant supply path 53a via a circulation flow path (not shown) provided outside the housing 50. A pump (not shown) is provided in the circulation flow path. By operating the pump, coolant is supplied from the coolant supply path 53a to the annular coolant flow path 56. The coolant supplied to the annular coolant flow path 56 flows inside the housing 50 and is discharged from the coolant discharge path 53b to the circulation flow path outside the housing 50, which will be described in detail later. In this way, the coolant circulates in the circulation flow path and the housing 50. In this embodiment, the coolant is cooling oil. The cooling oil functions as a coolant for cooling the motor 10, and functions as a lubricating oil for lubricating the rotor 20.

[0045] like Figure 1 As shown, a plurality of coolant discharge passages 62 are provided on the guide ring 60. Figure 4 As shown, each coolant discharge flow path 62 penetrates the guide ring 60 in the radial direction. Figure 1 As shown, on the guide ring 60, a plurality of coolant discharge passages 62 are provided dispersedly in the circumferential direction. Figure 4 As shown, the annular coolant flow path 56 and the space 57 (ie, the space where the coil end 42 a exists) are connected by the coolant discharge flow paths 62. Each coolant discharge flow path 62 discharges the coolant in the annular coolant flow path 56 toward the coil end 42 a.

[0046] Figure 5 2 is an exploded view of the stator core 32. Figure 5 As shown, the stator core 32 is composed of a plurality of electromagnetic steel plates 36 stacked in the axial direction. The stator core 32 has a back yoke 33 and a plurality of teeth 34. The back yoke 33 has a cylindrical shape. Each tooth 34 protrudes from the inner circumferential surface of the back yoke 33. That is, each tooth 34 protrudes radially inward from the back yoke 33. Each tooth 34 extends in the radial direction. The plurality of teeth 34 are arranged at intervals in the circumferential direction. As described above, the coil 40 is wound on the teeth 34. Each tooth 34 is located radially inward of the guide ring 60. Therefore, as Figure 3 As shown, the coil 40 is arranged radially inward of the guide ring 60 .

[0047] Figure 5The electromagnetic steel plate 36a shown is an electromagnetic steel plate located at the end in the axial direction among the multiple electromagnetic steel plates 36. The electromagnetic steel plate 36a constitutes the end surface 32a of the stator core 32. The electromagnetic steel plate 36b is adjacent to the electromagnetic steel plate 36a, and the electromagnetic steel plate 36c is adjacent to the electromagnetic steel plate 36b. Multiple electromagnetic steel plates 36d are stacked at a position adjacent to the electromagnetic steel plate 36c. The electromagnetic steel plates 36a~36c are thinner than the electromagnetic steel plate 36d. The electromagnetic steel plate 36a is provided with a plurality of through holes 37a that penetrate the electromagnetic steel plate 36a in the thickness direction. The plurality of through holes 37a are dispersedly arranged in the circumferential direction. As shown in FIG. Figure 4 As shown in FIG. 1 , the through hole 37a is arranged radially outside the guide ring 60 and is connected to the annular coolant flow path 56. Figure 5 As shown, a plurality of through holes 37b penetrating the electromagnetic steel plate 36b in the thickness direction are provided on the electromagnetic steel plate 36b. Each through hole 37b extends long in the radial direction. The plurality of through holes 37b are dispersedly arranged in the circumferential direction at the same intervals as the through holes 37a. A plurality of through holes 37c penetrating the electromagnetic steel plate 36c in the thickness direction are provided on the electromagnetic steel plate 36c. Each through hole 37c extends long in the radial direction. The plurality of through holes 37c are dispersedly arranged in the circumferential direction at the same intervals as the through holes 37a. A plurality of through holes 37d penetrating the electromagnetic steel plate 36d in the thickness direction are provided on each electromagnetic steel plate 36d. In each electromagnetic steel plate 36d, the plurality of through holes 37d are dispersedly arranged in the circumferential direction at the same intervals as the through holes 37a. As shown Figure 4 As shown in FIG. 3 , the through hole 37 d is arranged radially inwardly of the guide ring 60. Figure 5 , 6 As shown in FIG. 1 , the through hole 37 d is provided at the boundary between the back yoke 33 and the tooth 34 . That is, the through hole 37 d is provided across the back yoke 33 and the tooth 34 .

[0048] like Figure 4As shown, by connecting the through holes 37a to 37d to each other, an in-core coolant flow path 39 is formed in the stator core 32. The through hole 37a constitutes a first flow path (hereinafter referred to as the first flow path 37a), which constitutes an inlet (that is, an inlet opened at the end surface 32a) arranged at a position radially outside the guide ring 60. The through holes 37b and 37c constitute a second flow path (hereinafter referred to as the second flow path 37b and 37c), which extend from a position radially outside the guide ring 60 to a position radially inside. The plurality of through holes 37d constitute a third flow path (hereinafter referred to as the third flow path 37d), which is arranged radially inside the guide ring 60 and extends in the axial direction. The first flow path 37a and the third flow path 37d are connected by the second flow paths 37b and 37c. The first flow path 37a, the second flow paths 37b, 37c and the third flow path 37d form an in-core coolant flow path 39. Inside the stator core 32, a plurality of in-core coolant flow paths 39 are dispersedly provided in the circumferential direction. Figure 2 As shown, the downstream end of each in-core coolant flow path 39 opens at the end surface 32b.

[0049] When the motor 10 is working, the coolant is supplied to the inside of the housing 50. The coolant is supplied from the coolant supply path 53a to the annular coolant flow path 56. The coolant in the annular coolant flow path 56 flows to the coolant discharge flow path 62 and the core coolant flow path 39. The coolant flowing into the coolant discharge flow path 62 is discharged toward the coil end 42a. As a result, the coil end 42a is cooled. The coolant discharged toward the coil end 42a flows toward the lower part of the housing 50. In addition, the coolant flowing into the core coolant flow path 39 flows in the third flow path 37d. The third flow path 37d is arranged inside the tooth 34. Therefore, the coil 40 wound on the tooth 34 is efficiently cooled by the coolant flowing in the third flow path 37d. In particular, in this example, since the third flow path 37d is arranged at the boundary between the tooth 34 and the back yoke 33, the tooth 34 and the back yoke 33 can be effectively cooled. The coolant flowing to the downstream end in the third flow path 37d is discharged from the end surface 32b. The coil end 42b is cooled by the coolant discharged from the end surface 32b. The coolant discharged from the end surface 32b flows toward the lower part of the housing 50. The coolant flowing toward the lower part of the housing 50 is transported from the coolant discharge path 53b to the coolant supply path 53a via an external pump.

[0050] As described above, the motor 10 is cooled by flowing the coolant in the housing 50. Since the in-core coolant flow path 39 extends from the inlet on the outer circumference side of the guide ring 60 to the third flow path 37d on the inner circumference side of the guide ring 60, the coil 40 wound on the stator core 32 on the inner circumference side of the guide ring 60 can be efficiently cooled.

[0051] In addition, in the motor 10, the guide ring 60 is sandwiched between the housing 50 and the stator core 32 in the axial direction. According to this structure, regardless of the shape accuracy of the guide ring 60, the connecting portion between the guide ring 60 and the housing 50 and the connecting portion between the guide ring 60 and the stator core 32 can be tightly connected. In addition, only by stacking the partition wall 54 of the housing 50, the guide ring 60 and the stator core 32 in sequence, the connecting portion between the guide ring 60 and the housing 50 and the connecting portion between the guide ring 60 and the stator core 32 can be pressurized. Therefore, these connecting portions can be properly sealed. In particular, when a sealing member is arranged on these connecting portions, since pressure is appropriately applied to the sealing member, these connecting portions can be properly sealed. As a result, leakage of the coolant at each connecting portion can be prevented, and the flow rate of the coolant in each flow path can be accurately controlled. In addition, in the motor 10, the stator core 32 is in contact with the step portion 59 of the housing 50 in the axial direction. Therefore, it is also possible to appropriately apply pressure to the connection portion between the stator core 32 and the step portion 59, and the connection portion can be appropriately sealed. It should be noted that by configuring a sealing component at the connection portion between the stator core 32 and the step portion 59, the sealing of the connection portion can be further improved. By improving the sealing of the connection portion between the stator core 32 and the step portion 59, leakage of the coolant at the connection portion can be prevented, and the flow rate of the coolant in each flow path can be more accurately controlled. It should be noted that even if the coolant flows to the outer peripheral surface 32c of the stator core 32 via the connection portion between the stator core 32 and the step portion 59, no particular problem will occur. Therefore, in the case where it is not necessary to control the flow rate of the coolant in each flow path so accurately, the sealing of the connection portion between the stator core 32 and the step portion 59 can also be reduced.

[0052] In addition, in the motor 10, there is a recess 58 on the inner surface 52a of the housing 50. In the technology of connecting the outer circumference of the guide ring and the inner circumference of the housing to perform sealing as in Japanese Patent Application Laid-Open No. 2017-204980, when there is a recess on the inner circumference of the housing, proper sealing cannot be obtained. In other words, leakage of the coolant may occur in the recess. In contrast, in the present embodiment, since the guide ring 60 and the housing 50 are connected in the axial direction, even if there is a recess 58 on the inner surface 52a of the housing 50, the connection between the guide ring 60 and the housing 50 can be properly sealed.

[0053] In addition, in the motor 10, the inner diameter of the guide ring 60 is larger than the outer diameter of the coil end 42a. Therefore, after the stator 30 is completed by winding the coil 40 on the stator core 32, the guide ring 60 can be attached to the stator core 32. That is, the process of winding the coil 40 on the stator core 32 can be carried out without the guide ring 60. Therefore, the stator 30 can be manufactured efficiently.

[0054] In the above embodiment, the third flow path 37d is provided at the boundary between the tooth 34 and the back yoke 33. However, as Figure 7 As shown, the entire third flow path 37d may also be disposed within the tooth 34. Figure 8 As shown, the entire third flow path 37d may also be disposed in the back yoke 33. Fig. 9 As shown, a plurality of in-core coolant flow paths 39 may also be densely arranged at the outermost peripheral portion of the back yoke 33 .

[0055] In addition, in the above-mentioned embodiment, the inlet (ie, the through hole 37a) is independent for each in-core coolant flow path 39, but it may also be possible to Fig.10 As shown, the through hole 37 a is provided so as to span a plurality of in-core coolant flow paths 39 .

[0056] In addition, Figure 6~Figure 8 In the embodiment, one in-core coolant flow path 39 is provided for each tooth 34, but the in-core coolant flow paths 39 may be less than the number of teeth 34. Fig.11 As shown, one in-core coolant flow path 39 may be provided for two teeth 34. By reducing the in-core coolant flow paths 39 in this way, the pressure loss in the flow path of the coolant can be reduced.

[0057] In addition, in the above-mentioned embodiment, the coolant discharge flow path 62 is provided in the guide ring 60. However, the coolant discharge flow path 62 may not be provided in the guide ring 60. In this case, by improving the sealing performance of the connection portion between the guide ring 60 and the partition wall 54 and the connection portion between the guide ring 60 and the end surface 32a, the coolant can flow through the annular coolant flow path 56 more efficiently.

[0058] In addition, in the above-mentioned embodiment, the stator core 32 is fixed to the housing 50 by the bolts 49. However, the stator 30 may be fixed to the housing 50 by shrinkage fitting. In shrinkage fitting, the stator 30 is arranged in the housing 50 in a state where the housing 50 is heated, and then the housing 50 is cooled to shrink. As a result, the inner surface 52a of the housing 50 and the outer peripheral surface 32c of the stator core 32 are closely attached, and the stator 30 is fixed to the housing 50. In this case, the recessed portion 58 and the convex portion 38 can be eliminated from the inner surface 52a of the housing 50 and the outer peripheral surface 32c of the stator core 32. In this way, even when the stator 30 is fixed to the housing 50 by shrinkage fitting, the annular coolant flow path 56 can be easily formed by arranging the guide ring 60 in a manner sandwiched between the partition wall 54 and the end surface 32a.

[0059] In the above-described embodiment, the partition wall 54 and the outer peripheral wall 52 are integrated, but the partition wall 54 may be formed separately from the outer peripheral wall 52 and the partition wall 54 may be fixed to the outer peripheral wall 52 by bolts or the like.

[0060] In the above embodiment, the first flow path is composed of a single electromagnetic steel sheet 36a, but the first flow path may be composed of a plurality of stacked electromagnetic steel sheets. In the above embodiment, the second flow path is composed of a plurality of stacked electromagnetic steel sheets 36b and 36c, but the second flow path may be composed of a single electromagnetic steel sheet.

[0061] In addition, in the above-mentioned embodiment, a sealing component is provided at the connection portion between the guide ring 60 and the end face 32a, and at the connection portion between the guide ring 60 and the partition wall 54, but a sealing component may not be provided. For example, by forming the guide ring 60 from a highly flexible resin, high sealing can sometimes be achieved without a sealing component. In addition, in order to increase the strength of the guide ring 60, the guide ring 60 may also be formed of metal. In addition, a groove may be provided on the partition wall 54, and the guide ring 60 may be in contact with the partition wall 54 in the groove. In addition, in Figure 4 In the embodiment, the diameter of the guide ring 60 increases as it approaches the partition wall 54 , but the diameter of the guide ring 60 may decrease as it approaches the partition wall 54 , and the diameter of the guide ring 60 may be constant regardless of the axial position.

[0062] In addition, in the embodiment, Figure 2 As shown, the downstream portion of each in-core coolant flow path 39 extends in a straight line, but the downstream portion may also be connected to the upstream portion (ie, Figure 4 ) is also shifted radially outward in a step-like manner. Thus, cooling liquid can be efficiently supplied to the coil end 42b.

[0063] The above detailed description of the implementation methods is provided, but these are merely examples and do not limit the claims. The technology described in the claims includes various modifications and changes to the specific examples illustrated above. The technical elements described in this specification or the drawings exert technical practicality alone or in various combinations, and are not limited to the combinations described in the claims at the time of application. In addition, the technology illustrated in this specification or the drawings is a technology that achieves multiple purposes at the same time, and achieving one of the purposes itself has technical usefulness.

Claims

1. A motor, characterized in that: The motor comprises: stator core; a housing that accommodates the stator core, the housing having a facing portion that faces an end surface of the stator core; and A guide ring is accommodated in the housing, has a ring shape extending around the motor shaft, and is sandwiched between the end surface and the facing portion, wherein: The space surrounded by the inner surface of the housing, the outer peripheral surface of the guide ring and the end surface forms an annular coolant flow path. A plurality of in-core coolant flow paths are provided inside the stator core. The inlet of each of the core coolant flow paths opens on the end surface at a position radially outside the guide ring. The inlet of each of the in-core coolant flow paths is connected to the annular coolant flow path.

2. The motor according to claim 1, characterized in that The motor further includes a coil, which is wound on the stator core at a position closer to the inside than the guide ring in the radial direction, wherein each of the in-core coolant flow paths includes: a first flow path, the first flow path being arranged at a position closer to the outside than the guide ring in the radial direction and connected to the inlet; a second flow path extending from a position closer to the outside than the guide ring in the radial direction to a position closer to the inside than the guide ring and connected to the first flow path; and A third flow path is arranged at the inner side of the guide ring in the radial direction, extends in the axial direction, and is connected to the second flow path.

3. The motor according to claim 2, characterized in that The second flow path extends along the radial direction.

4. The motor according to claim 2 or 3, characterized in that: The stator core is composed of a plurality of electromagnetic steel plates stacked in the axial direction; The plurality of electromagnetic steel sheets include a first electromagnetic steel sheet, a second electromagnetic steel sheet, and a third electromagnetic steel sheet; The first electromagnetic steel plate existing within a range including the end surface is provided with a first through hole arranged at a position on the outside of the guide ring in the radial direction; The second electromagnetic steel sheet adjacent to the first electromagnetic steel sheet is provided with a second through hole extending along the radial direction; A third through hole is provided on the third electromagnetic steel plate adjacent to the second electromagnetic steel plate, and the third through hole is arranged at a position closer to the inner side than the guide ring in the radial direction; The first through hole forms the first flow path; The second through hole forms the second flow path; The third flow path is formed by the third through hole.

5. The motor according to claim 2 or 3, characterized in that: The stator core has a back yoke and a plurality of teeth protruding inward from the back yoke in the radial direction; The coil is wound around the plurality of teeth; The third flow path is provided inside a corresponding one of the plurality of teeth.

6. The motor according to claim 5, characterized in that The third flow path is provided at a boundary of the tooth corresponding to the back yoke.

7. The motor according to any one of claims 1 to 3, characterized in that: A coil end is provided on the end surface; The guide ring has an inner diameter greater than an outer diameter of the coil end.

8. The motor according to claim 2 or 3, characterized in that: A coil end is provided at a position closer to the inner side than the guide ring in the radial direction; The guide ring is provided with a coolant discharge flow path penetrating the guide ring in the radial direction.

9. The motor according to any one of claims 1 to 3, characterized in that: The housing has a contact portion in contact with the end surface; A sealing member is provided at an interface between the end surface and the contact portion.

10. The motor according to any one of claims 1 to 3, characterized in that: A recess is provided on the inner peripheral surface of the housing.

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