Rotor and method for manufacturing the rotor

Abstract

To provide a rotor and a manufacturing method thereof capable of preventing a local increase in stress generated in a rotor core in the axial direction when the cylindrical portion of the rotor hub is fixed radially inwardly of the rotor core by interference fit.SOLUTION: A rotor 100 includes a rotor core 10 and a rotor hub 30 including a cylindrical portion 40 and a flange portion 50. The cylindrical portion 40 is fixed to the rotor core 10 by interference fit over the entire Z-direction (axial direction) of the rotor core 10. A joint portion 51a of the flange portion 50, which is joined to at least the cylindrical portion 40, is provided outside in the Z direction of the end surface 10a of the rotor core 10 on the Z1 side (one side in the axial direction).SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a rotor and a method for manufacturing a rotor. [Background technology]

[0002] BACKGROUND ART Conventionally, a rotor is known that includes a rotor hub that includes a cylindrical portion that supports a rotor core radially inside and a flange portion that is provided radially inside the cylindrical portion (see, for example, Patent Document 1).

[0003] The above-mentioned Patent Document 1 discloses a rotor in which a rotor support member (rotor hub) is fitted radially inside a rotor core. In the rotor described in the above-mentioned Patent Document 1, the rotor support member includes a cylindrical rotor support portion (cylindrical portion) that supports the rotor core on the radially inside of the rotor core, and a rotor vertical wall (flange portion) provided radially inside the rotor support portion. The rotor vertical wall is provided so as to extend radially inward from the rotor support portion. Furthermore, the rotor vertical wall is provided in the axial direction of the rotor core between one end face and the other end face in the axial direction of the rotor core. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2016-185759 Summary of the Invention [Problem to be solved by the invention]

[0005] Although not explicitly stated in Patent Document 1, in a conventional rotor such as that described in Patent Document 1, the rotor support portion (cylindrical portion) of the rotor support member (rotor hub) may be fastened by interference fit to the radially inner side of the rotor core. However, in the rotor described in Patent Document 1, the rotor support portion is stretched radially outward from the rotor vertical wall at a portion of the rotor support portion where the rotor vertical wall is provided on the radially inner side. This increases the stress generated when the rotor support portion is fastened by interference fit to the radially inner side of the rotor core. In other words, the stress generated in the rotor core in the axial direction increases locally. For this reason, there is a need for a rotor and a method for manufacturing a rotor that can prevent the stress generated in the rotor core in the axial direction from increasing locally when the rotor support portion (cylindrical portion) of the rotor support member (rotor hub) is fastened by interference fit to the radially inner side of the rotor core.

[0006] This invention has been made to solve the above-mentioned problems, and one object of this invention is to provide a rotor and a method for manufacturing a rotor that can prevent localized increase in stress generated in the rotor core in the axial direction when the cylindrical portion of the rotor hub is fixed to the radially inner side of the rotor core by an interference fit. [Means for solving the problem]

[0007] In order to achieve the above object, a rotor according to a first aspect of the present invention comprises a rotor hub including a rotor core, a cylindrical member supporting the rotor core on a radially inner side of the rotor core, and a flange member joined to one axial end of the cylindrical member of the rotor core and provided on the radially inner side of the cylindrical member; an annular end plate provided on one axial side of the rotor core and on the radially outer side of the cylindrical member so as to abut against the rotor core, with the cylindrical member being gap-fitted; the cylindrical member is fixed to the rotor core by interference fit over the entire axial direction of the rotor core, and at least a joint portion of the flange member that is joined to the cylindrical member is provided axially outward of one end face of the rotor core in the axial direction. The joining portion is provided at a position where the cylindrical member radially overlaps at least a portion of the end plate with which the cylindrical member is loosely fitted. .

[0008] In the rotor according to the first aspect of the present invention, as described above, the flange portion Material At least the cylindrical part Material The joint portion where the flange portion is joined to the rotor core is provided axially outward from one end face of the rotor core in the axial direction. Material But the cylindrical part Material The rotor core is not easily fitted to the cylindrical portion of the rotor core, and the rotor core is not easily fitted to the cylindrical portion of the rotor core. Material When the rotor core is pressed into the cylindrical part, Material At the flange Material As a result, it is possible to prevent the formation of a portion that is stretched radially outward. Material When the rotor core is fixed to the radially inner side of the rotor core by an interference fit, it is possible to prevent stress generated in the rotor core in the axial direction from increasing locally.

[0009] In the rotor according to the first aspect, as described above, the cylindrical portion Material is fixed to the rotor core by interference fit over the entire axial direction of the rotor core. Material Compared with the case where the rotor core is fixed to the rotor core by interference fit only in a part of the axial direction of the rotor core, Material (Flange Material ) and torque can be transmitted efficiently between them.

[0010] In order to achieve the above object, a rotor manufacturing method according to a second aspect of the present invention includes a rotor hub including a rotor core, a cylindrical member that supports the rotor core on a radially inner side of the rotor core, and a flange member that is joined to one axial end of the cylindrical member of the rotor core and is provided on the radially inner side of the cylindrical member; an annular end plate provided on one axial side of the rotor core and on the radially outer side of the cylindrical member so as to abut against the rotor core, with the cylindrical member being gap-fitted; a cylindrical member provided on a flange member at least at a joint portion thereof joined to the cylindrical member, the joint portion being located axially outward of one end face of the rotor core in the axial direction; At the same time, the joining portion is provided at a position where the cylindrical member radially overlaps at least a part of the end plate into which the cylindrical member is loosely fitted.The method includes a fixing step of fixing the rotor core to the rotor core by interference fit over the entire axial direction of the rotor core.

[0011] In a rotor manufacturing method according to a second aspect of the present invention, as described above, the cylindrical portion Material The flange part Material At least the cylindrical part Material The flange portion is fixed to the rotor core by interference fit over the entire axial direction of the rotor core so that the joint portion where the flange portion is joined to the rotor core is located axially outward of one end face of the rotor core in the axial direction. Material But the cylindrical part Material The cylindrical portion is arranged in a state where it is difficult to be arranged so as to abut from the radial inside against the part (the entire axial direction of the rotor core) that is fixed by the rotor core by interference fit. Material is fixed to the rotor core by interference fit. As a result, the cylindrical portion Material When the rotor core is pressed into the cylindrical part, Material At the flange Material As a result, as in the rotor according to the first aspect, the cylindrical portion of the rotor hub is prevented from being stretched radially outward. Material When the rotor core is fixed to the radially inner side of the rotor core by an interference fit, it is possible to prevent stress generated in the rotor core in the axial direction from increasing locally. [Effects of the Invention]

[0012] According to the present invention, as described above, it is possible to provide a rotor and a method for manufacturing a rotor that can prevent localized increase in stress generated in the rotor core in the axial direction when the cylindrical portion of the rotor hub is fixed to the radially inner side of the rotor core by a tight fit. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view showing a portion of a vehicle drive device including a rotor according to an embodiment. [Figure 2] 1 is a cross-sectional view of a rotor core and a cylindrical portion of a rotor according to an embodiment, viewed in the axial direction. [Figure 3] FIG. 3 is a partially enlarged cross-sectional view of FIG. 2. [Figure 4] 1 is a diagram illustrating a manufacturing flow of a rotor according to one embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0015] [Rotor configuration] The configuration of a rotor 100 according to one embodiment will be described with reference to FIGS.

[0016] In the following description, the axial, radial, and circumferential directions of the rotor 100 (rotor core 10 (see FIG. 1)) are referred to as the Z direction, R direction, and C direction, respectively. One side and the other side in the Z direction are referred to as the Z1 side and the Z2 side, respectively. One side (radially inner side) and the other side (radially outer side) in the R direction are referred to as the R1 side and the R2 side, respectively.

[0017] (Overall rotor configuration) As shown in FIG. 1, the rotor 100, together with the stator 101, constitutes a part of a rotating electric machine 102. The rotating electric machine 102 is, for example, a motor, a generator, or a motor / generator. The rotor 100 and the stator 101 are each formed in an annular shape. The rotor 100 is configured to rotate around a rotation axis 90. The rotor 100 is disposed on the R1 side of the stator 101 so that the outer peripheral surface of the rotor 100 and the inner peripheral surface of the stator 101 face each other in the R direction. In other words, the rotor 100 is configured as a part of an inner rotor type rotating electric machine 102.

[0018] The rotating electric machine 102, together with an engine (not shown), is provided in a vehicle drive device 103 as a drive source for driving a vehicle. The vehicle drive device 103 is provided with a clutch unit 104 for transmitting and interrupting drive force. The clutch unit 104 is provided on the R1 side of a cylindrical portion 40 (described later) of the rotor 100. The clutch unit 104 is also provided on the Z2 side (the other side in the axial direction) of a cylindrical portion-side portion 51 (described later) of the cylindrical portion 40. The clutch unit 104 includes a first clutch unit 104a provided on the Z2 side and a second clutch unit 104b provided on the Z1 side on the R1 side of the cylindrical portion 40 of the rotor 100.

[0019] The rotor 100 includes a rotor core 10 , an end plate 21 , an end plate 22 , and a rotor hub 30 .

[0020] A rotor hub insertion hole 11 extending in the Z direction (axial direction) is formed in the rotor core 10. As shown in FIG. 2, the rotor hub insertion hole 11 is provided in the center of the rotor core 10 when viewed in the Z direction. The rotor hub 30 is inserted into the rotor hub insertion hole 11. In other words, the rotor hub 30 is provided on the R1 side of the rotor core 10. As will be described later, the rotor hub 30 is fixed to the rotor core 10.

[0021] As shown in FIG. 1, rotor core 10 is made up of a plurality of laminated electromagnetic steel plates. Magnet insertion holes 12 extending in the lamination direction (Z direction) of the electromagnetic steel plates are formed in rotor core 10. The magnet insertion holes 12 are arranged in the R2 side portion of rotor core 10. As shown in FIG. 2, rotor core 10 is provided with a plurality of magnet insertion holes 12 (32 in this embodiment). The plurality of magnet insertion holes 12 are arranged at equal angular intervals along the C direction when viewed in the Z direction.

[0022] A permanent magnet 13 is housed (placed) in each of the multiple magnet insertion holes 12. That is, the rotating electric machine 102 is configured as an interior permanent magnet motor (IPM motor). The permanent magnet 13 has a rectangular cross section perpendicular to the Z direction. The permanent magnet 13 is configured, for example, so that the magnetization direction (magnetization direction) is in the short direction.

[0023] In the rotor core 10, a magnetic pole 14 is formed by a pair of permanent magnets 13 adjacent to each other in the C direction. That is, a plurality of magnetic poles 14 (16 in this embodiment) are formed in the rotor core 10. The pair of permanent magnets 13 that form the magnetic pole 14 is arranged in a V-shape that protrudes toward the R1 side. However, the shape of the pair of permanent magnets 13 that form the magnetic pole 14 is not limited to this.

[0024] The rotor core 10 includes key portions 15 that protrude from the inner circumferential surface of the rotor core 10 toward the R1 side (radially inward). The key portions 15 have a rectangular shape when viewed in the Z direction. Two key portions 15 are provided in the rotor core 10. When viewed in the Z direction, the two key portions 15 are arranged at equal angular intervals (180 degrees) along the C direction. As shown in FIG. 3, the key portions 15 are provided at positions in the C direction (circumferential direction) that correspond to the d axis of the rotor core 10. The key portions 15 are provided over the entire rotor core 10 in the Z direction.

[0025] The rotor core 10 includes relief portions 16 recessed toward the R2 side (radially outward) at positions adjacent to the key portions 15 in the C direction. Specifically, the relief portions 16 are provided on both sides of the key portions 15 in the C direction so as to be adjacent to the key portions 15. The relief portions 16 are provided to prevent the corners on the R2 side of the key groove portions 42 that engage with the key portions 15 from coming into contact with the bases of the key portions 15.

[0026] The rotor core 10 includes a refrigerant passage recess 19 provided at a position corresponding to the q axis of the rotor core 10 in the C direction. The refrigerant passage recess 19 is recessed toward the R2 side (radially outward). A cooling refrigerant for cooling the rotor core 10 flows through the refrigerant passage recess 19.

[0027] As shown in FIG. 1 , end plate 21 and end plate 22 are provided on the Z1 side (one side in the axial direction) and Z2 side (the other side in the axial direction) of rotor core 10, respectively, so as to abut against rotor core 10. End plate 21 and end plate 22 are also provided on the R2 side (radially outer side) of cylindrical portion 40. Specifically, end plate 21 is provided on the Z1 side of rotor core 10 so as to abut against Z1-side end face 10a of rotor core 10. End plate 22 is provided on the Z2 side of rotor core 10 so as to abut against Z2-side end face 10b of rotor core 10. End plate 21 and end plate 22 are provided to prevent permanent magnet 13 from jumping out of magnet insertion hole 12. End plate 21 and end plate 22 are each annular, and cylindrical portion 40 is loose-fitted on the R1 side.

[0028] The rotor hub 30 includes a cylindrical portion 40 and a flange portion 50. As shown in FIG. 2, the cylindrical portion 40 has a cylindrical shape. The cylindrical portion 40 is provided on the R1 side of the rotor core 10 so that the inner circumferential surface of the rotor core 10 and the outer circumferential surface of the cylindrical portion 40 face each other. The cylindrical portion 40 supports the rotor core 10 on the R1 side (radially inner side) of the rotor core 10. As shown in FIG. 1, the flange portion 50 is joined to an end portion 41 on the Z1 side of the cylindrical portion 40. The flange portion 50 is provided on the R1 side of the cylindrical portion 40. The flange portion 50 includes a cylindrical portion-side portion 51 provided on the cylindrical portion 40 side (R2 side) of the flange portion 50 so as to extend from a joint portion 51a joined to the Z1-side end portion 41 of the cylindrical portion 40 toward the R1 side (radially inner side).

[0029] The cylindrical portion 40 includes a key groove portion 42 that engages with the key portion 15. The key groove portion 42 is recessed toward the R1 side (radially inward) at a position on the outer circumferential surface of the cylindrical portion 40 opposite the key portion 15. The key groove portion 42 is recessed in a rectangular shape toward the R1 side so as to engage with the rectangular key portion 15 that protrudes toward the R1 side. Two key groove portions 42 are provided in the cylindrical portion 40. When viewed in the Z direction, the two key groove portions 42 are arranged at equal angular intervals (180 degrees) along the C direction. As shown in FIG. 3, the key groove portion 42 is provided at a position in the C direction that corresponds to the d-axis of the rotor core 10. The key groove portion 42 is provided over the entire cylindrical portion 40 in the Z direction.

[0030] 2, the cylindrical portion 40 includes a plurality of spline recesses 43 recessed toward the R2 side (radially outward) to engage with the clutch portion 104 (see FIG. 1). Specifically, the clutch portion 104 includes a plurality of spline protrusions (not shown) protruding toward the R2 side at positions on the outer circumferential surface of the clutch portion 104 that face the plurality of spline recesses 43 of the cylindrical portion 40. Each of the plurality of spline recesses 43 of the cylindrical portion 40 engages with the plurality of spline protrusions of the clutch portion 104.

[0031] The plurality of spline recesses 43 are provided over the entire cylindrical portion 40 in the Z direction (axial direction). This allows the clutch portion 104, which is arranged on the Z2 side (the other side in the axial direction) of the cylindrical portion-side section 51, to engage with the plurality of spline recesses 43 of the cylindrical portion 40 over the entire cylindrical portion 40 in the Z direction (axial direction). This allows the clutch portion 104 to engage with the plurality of spline recesses 43 of the cylindrical portion 40 over a relatively wide range in the Z direction, thereby enabling efficient transmission of torque between the cylindrical portion 40 (flange portion 50) and the clutch portion 104.

[0032] The key groove portions 42 are disposed between adjacent spline recessed portions 43 in the C direction (circumferential direction). Specifically, as shown in Fig. 3, each of the spline recessed portions 43 is provided at a position in the C direction corresponding to the q axis of the rotor core 10. As described above, the key groove portions 42 are provided at a position in the C direction corresponding to the d axis of the rotor core 10.

[0033] This makes it difficult for the key groove portion 42, which is recessed in the cylindrical portion 40 toward the R1 side (radially inward), and the plurality of spline recesses 43, which are recessed in the cylindrical portion 40 toward the R2 side (radially outward), to overlap in the R direction (radially).This makes it possible to prevent the occurrence of a wide area in the C direction where the thickness of the cylindrical portion 40 in the R direction becomes excessively small (the strength is reduced) due to the key groove portion 42 and the plurality of spline recesses 43 overlapping in the R direction.

[0034] Each of the spline recesses 43 includes a bottom surface 43a extending along the C direction and an inclined side surface 43b that is continuous with the bottom surface 43a at both ends of the bottom surface 43a in the C direction. Specifically, in each of the spline recesses 43, the inclined side surface 43b, the bottom surface 43a, and the inclined side surface 43b are arranged in this order in the C direction. The inclined side surface 43b is inclined so that its width in the C direction increases toward the R1 side. That is, each of the spline protrusions of the clutch portion 104 that engage with each of the spline recesses 43 increases in width in the C direction toward the R1 side. The end 42a of the keyway portion 42 in the C direction is positioned to overlap the inclined side surface 43b in the R direction in the C direction. Specifically, the end 42a of the keyway portion 42 in the C direction overlaps the center of the inclined side surface 43b in the R direction in the C direction.

[0035] (Rotor core and cylindrical part fixing structure) Here, the cylindrical portion 40 is fixed to the rotor core 10 by an interference fit over the entire Z direction (axial direction) of the rotor core 10. Specifically, the cylindrical portion 40 is fitted by an interference fit such as shrink fitting into the rotor hub insertion hole 11 of the rotor core 10, whose inner diameter (inner diameter of the rotor hub insertion hole 11) is larger than the outer diameter of the cylindrical portion 40 over the entire Z direction.

[0036] This allows torque to be transmitted more efficiently between the rotor core 10 and the cylindrical portion 40 (flange portion 50) compared to when the cylindrical portion 40 is fixed to the rotor core 10 by an interference fit only in a portion of the rotor core 10 in the Z direction (axial direction).

[0037] 1, at least a joint portion 51a of the flange portion 50 that is joined to the cylindrical portion 40 is provided on the outer side in the Z direction (axial direction) of an end face 10a on the Z1 side (one side in the axial direction) of the rotor core 10. Specifically, the entire joint portion 51a of the flange portion 50 that is joined to the cylindrical portion 40 is provided on the Z1 side of the end face 10a on the Z1 side of the rotor core 10.

[0038] This makes it difficult for the flange portion 50 to be positioned so as to abut from the R1 side (radially inner side) against the portion of the cylindrical portion 40 that is fixed by the rotor core 10 through an interference fit (the entire portion in the Z direction (axial direction) of the rotor core 10). This makes it difficult for a portion of the cylindrical portion 40 to be pushed toward the R2 side (radially outer side) by the flange portion 50 when the cylindrical portion 40 is interference-fitted by the rotor core 10. As a result, when the cylindrical portion 40 of the rotor hub 30 is fixed by an interference fit on the R1 side of the rotor core 10, it is possible to prevent stress generated in the rotor core 10 in the Z direction from becoming locally large.

[0039] Furthermore, at least the cylindrical portion side portion 51 of the flange portion 50 is provided further outward in the Z direction (axial direction) than the end face 10a on the Z1 side (one side in the axial direction). Specifically, the entire cylindrical portion side portion 51 of the flange portion 50 is provided on the Z1 side than the end face 10a on the Z1 side of the rotor core 10.

[0040] This makes it less likely that the flange portion 50 will be positioned to abut from the R1 side (radially inner side) against the portion of the cylindrical portion 40 that is fixed by the rotor core 10 through an interference fit. This makes it less likely that a portion of the cylindrical portion 40 will be pushed toward the R2 side (radially outer side) by the flange portion 50 when the cylindrical portion 40 is interference fitted into the rotor core 10.

[0041] Furthermore, at least the cylindrical portion-side portion 51 of the flange portion 50 is located outside in the Z direction (axial direction) of the end face 10a on the Z1 side (one side in the axial direction) of the rotor core 10, and at a position overlapping in the R direction (radial direction) with at least a portion of the end plate 21. Specifically, the cylindrical portion-side portion 51 is located so that the Z2 side surface of the entire cylindrical portion-side portion 51 of the flange portion 50 is located between the Z1 side end face 10a of the rotor core 10 and the Z2 side end of the end plate 21 in the Z direction, with the cylindrical portion-side portion 51 extending from the joint portion 51a toward the R1 side.

[0042] This makes it possible to prevent the cylindrical portion-side portion 51 from being significantly separated in the Z direction (axial direction) outward from the end face 10a on the Z1 side (one side in the axial direction) of the rotor core 10. This prevents the space in the Z direction from becoming larger due to the cylindrical portion-side portion 51 being disposed further outward in the Z direction than the end face 10a on the Z1 side of the rotor core 10, and also makes it less likely that a portion of the cylindrical portion 40 will be pushed toward the R2 side (radially outward) by the flange portion 50 when the cylindrical portion 40 is tightly fitted into the rotor core 10.

[0043] [Rotor manufacturing method] A method for manufacturing the rotor 100 according to one embodiment will now be described with reference to FIG.

[0044] First, in step S1, a preparation step is performed to prepare the rotor core 10 and the rotor hub 30. Specifically, in the preparation step (S1), the rotor core 10 is prepared. Also prepared is the rotor hub 30, which includes a cylindrical portion 40 and a flange portion 50 joined to one end 41 of the cylindrical portion 40 in the Z direction and provided on the R1 side of the cylindrical portion 40.

[0045] Next, in step S2, a fixing process is performed in which the cylindrical portion 40 of the rotor hub 30 is fixed to the rotor core 10 by interference fitting. Specifically, in the fixing process (S2), the cylindrical portion 40 of the rotor hub 30 is interference fitted into the rotor hub insertion hole 11 extending in the Z direction of the rotor core 10 by, for example, shrink fitting.

[0046] Here, in the fixing step (S2), the cylindrical portion 40 is fixed to the rotor core 10 by interference fit over the entire Z direction of the rotor core 10 so that at least a joint portion 51a of the flange portion 50 that is joined to the cylindrical portion 40 is located further outward in the Z direction (axial direction) than an end face 10a on the Z1 side (one side in the axial direction) of the rotor core 10. Specifically, in the preparation step (S1), the rotor core 10 and the rotor hub 30 are prepared such that the inner diameter of the rotor core 10 (the inner diameter of the rotor hub insertion hole 11) is larger than the outer diameter of the cylindrical portion 40 over the entire Z direction. Then, in the fixing step (S2), the inner diameter of the rotor core 10 is temporarily increased by thermal expansion of the rotor core 10, and the cylindrical portion 40 of the rotor hub 30 is inserted into the rotor hub insertion hole 11 extending in the Z direction of the rotor core 10. Then, by cooling and contraction of the rotor core 10, the cylindrical portion 40 is fastened to the rotor core 10 over the entire Z direction.

[0047] This allows the cylindrical portion 40 to be fixed to the rotor core 10 by an interference fit in a state in which the flange portion 50 is unlikely to be positioned so as to abut from the R1 side (radially inner side) against the portion of the cylindrical portion 40 that is fixed to the rotor core 10 by an interference fit (the entire portion in the Z direction (axial direction) of the rotor core 10). This makes it difficult for a portion of the cylindrical portion 40 to be pushed toward the R2 side (radially outer side) by the flange portion 50 when the cylindrical portion 40 is interference fitted to the rotor core 10. As a result, when the cylindrical portion 40 of the rotor hub 30 is fixed to the R1 side of the rotor core 10 by an interference fit, it is possible to prevent stress generated in the rotor core 10 in the Z direction from becoming locally large.

[0048] [Variations] The embodiments disclosed herein should be considered to be illustrative and not restrictive in all respects. The scope of the present invention is defined by the claims rather than the above description of the embodiments, and further includes all modifications (variations) within the meaning and scope of the claims.

[0049] For example, in the above embodiment, an example was shown in which at least the cylindrical portion-side portion 51 of the flange portion 50 is provided further outward in the Z direction (axial direction) than the end face 10a on the Z1 side (one side in the axial direction) of the rotor core 10 and in a position overlapping with at least a portion of the end plate 21 in the R direction (radial direction), but the present invention is not limited to this. In the present invention, the cylindrical portion of the flange portion may be provided further outward in the axial direction than the end face on one side in the axial direction of the rotor core and in a position not overlapping with the end plate in the radial direction.

[0050] In the above embodiment, the key groove portion 42 is disposed between adjacent spline recessed portions 43 in the C direction (circumferential direction), but the present invention is not limited to this. In the present invention, the key groove portion may be disposed at a position other than between adjacent spline recessed portions in the circumferential direction.

[0051] In the above embodiment, the example in which the plurality of spline recesses 43 are provided over the entire cylindrical portion 40 in the Z direction (axial direction) has been described, but the present invention is not limited to this. In the present invention, the plurality of spline recesses may be provided only in a portion of the cylindrical portion in the axial direction.

[0052] In the above embodiment, each of the plurality of spline recesses 43 includes an inclined side surface 43b that is inclined so that its width in the C direction (circumferential direction) increases toward the R1 side (radially inward), but the present invention is not limited to this. In the present invention, each of the plurality of spline recesses may be configured to include a side surface that does not increase its width in the circumferential direction toward the radially inward side.

[0053] In the above embodiment, the cylindrical portion 40 includes a plurality of spline recesses 43 recessed toward the R2 side (radially outward) to engage with the clutch portion 104, but the present invention is not limited to this. In the present invention, the cylindrical portion may be configured not to include a plurality of spline recesses recessed toward the radially outward to engage with the clutch portion.

[0054] In the above embodiment, the rotor core 10 includes the relief portion 16 provided so as to be recessed toward the R2 side (radially outward) at a position adjacent to the key portion 15 in the C direction (circumferential direction), but the present invention is not limited to this. In the present invention, the rotor core may be configured not to include the relief portion provided so as to be recessed toward the radially outward at a position adjacent to the key portion in the circumferential direction.

[0055] In the above embodiment, the rotor core 10 includes the refrigerant flow path recess 19 provided at a position corresponding to the q axis of the rotor core 10 in the C direction (circumferential direction), but the present invention is not limited to this. In the present invention, the rotor core may be configured to include the refrigerant flow path recess provided at a position not corresponding to the q axis of the rotor core in the circumferential direction. Also, the rotor core may be configured not to include the refrigerant flow path recess.

[0056] In the above embodiment, an example has been shown in which the end 42a of the key groove portion 42 in the C direction (circumferential direction) is provided at a position that overlaps the inclined side surface portion 43b in the R direction (radial direction) in the C direction (circumferential direction), but the present invention is not limited to this. In the present invention, the end of the key groove portion in the circumferential direction may be provided at a position that does not overlap the inclined side surface portion in the radial direction.

[0057] In the above embodiment, an example has been shown in which two key portions 15 and two key groove portions 42 are provided in the rotor core 10 and the cylindrical portion 40, respectively, but the present invention is not limited to this. In the present invention, only one key portion and one key groove portion may be provided in the rotor core and the cylindrical portion, respectively, or three or more key portions and one key groove portion may be provided in each.

[0058] In the above embodiment, the key portion 15 and the key groove portion 42 are provided over the entire Z direction (axial direction) of the rotor core 10 and the cylindrical portion 40, respectively, but the present invention is not limited to this. In the present invention, the key portion may be provided on a portion of the axial direction of the rotor core, and the key groove portion may be provided on a portion of the axial direction of the cylindrical portion.

[0059] In the above embodiment, the key portion 15 and the key groove portion 42 are provided at positions corresponding to the d-axis of the rotor core 10 in the C direction (circumferential direction), but the present invention is not limited to this. In the present invention, the key portion and the key groove portion may be provided at positions not corresponding to the d-axis of the rotor core in the circumferential direction.

[0060] In addition, in the above embodiment, an example was shown in which the rotor core 10 and the cylindrical portion 40 respectively include the key portion 15 and the key groove portion 42 that engages with the key portion 15, but the present invention is not limited to this. In the present invention, the rotor core may be configured not to include a key portion, and the cylindrical portion may be configured not to include a key groove portion. [Explanation of symbols]

[0061] 10...rotor core, 10a...end surface (on one side in the axial direction) of rotor core, 21...end plate, 30...rotor hub, 40...cylindrical portion, 41...end portion (on one side in the axial direction of rotor core) of cylindrical portion, 43...spline recess, 50...flange portion, 51...cylindrical portion side portion, 51a...joint portion, 100...rotor, 104...clutch portion

Claims

1. A rotor core; a rotor hub including: a cylindrical member that supports the rotor core on a radially inner side of the rotor core; and a flange member that is joined to one end of the cylindrical member in the axial direction of the rotor core and is provided on the radially inner side of the cylindrical member; an annular end plate provided on one side of the rotor core in the axial direction and on the radially outer side of the cylindrical member so as to abut against the rotor core, and into which the cylindrical member is loosely fitted; the cylindrical member is fixed to the rotor core by interference fit over the entire rotor core in the axial direction, a joint portion of the flange member that is joined to at least the cylindrical member is provided axially outward of one end face of the rotor core in the axial direction, The joining portion is provided at a position where the cylindrical member overlaps in the radial direction with at least a portion of the end plate with which it is loosely fitted.

2. the flange member includes a cylindrical portion-side portion provided on the cylindrical member side of the flange member so as to extend radially inward from the joint portion, The rotor according to claim 1 , wherein at least the cylindrical portion of the flange member is provided axially outward of the one end face in the axial direction.

3. A rotor as described in Claim 2, wherein at least the cylindrical portion of the flange member is positioned axially outward of the end face on one side of the rotor core in the axial direction and radially overlapping with at least a portion of the end plate.

4. the cylindrical member includes a plurality of spline recesses recessed radially outward to engage with a clutch portion provided on the radially inner side of the cylindrical member and on the other side of the cylindrical portion in the axial direction, The rotor according to claim 3 , wherein the plurality of spline recesses are provided over the entire cylindrical member in the axial direction.

5. a rotor hub including a rotor core, a cylindrical member supporting the rotor core on the radially inner side of the rotor core, and a flange member joined to one end of the cylindrical member in the axial direction of the rotor core and provided on the radially inner side of the cylindrical member, and an annular end plate provided on one side of the axial direction of the rotor core and on the radially outer side of the cylindrical member so as to abut against the rotor core, and into which the cylindrical member is loosely fitted, A method for manufacturing a rotor, comprising a fixing step of fixing the cylindrical member to the rotor core by interference fit over the entire axial direction of the rotor core so that at least a joint portion of the flange member that is joined to the cylindrical member is located axially outward of one end face of the rotor core in the axial direction, and the joint portion is located at a position that radially overlaps at least a portion of the end plate into which the cylindrical member is loosely fitted.

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