rotor

Abstract

The present invention relates to a rotor. In the rotor, a first end plate includes a first opening portion provided at a first position corresponding to a position where a rivet portion is not provided and connected to a first oil flow passage, and a second end plate includes a second opening portion provided at a second position corresponding to a position where a rivet portion is provided and connected to a second oil flow passage.

Description

Technical Field

[0001] This invention relates to rotors. Background Technology

[0002] Previously, rotors with rotor hubs were known to exist. For example, such a rotor was disclosed in Japanese Patent Application Publication No. 2019-115217.

[0003] The rotor described in Japanese Patent Application Publication No. 2019-115217 includes a rotor core, an end plate for holding the end face of the rotor core, and a rotor shaft for mounting the rotor core and the end plate. Multiple slits are provided on the inner circumferential surface of the end plate on one axial side. The rotor shaft includes a hollow cylindrical mounting portion (rotor hub) mounted to the rotor core. A thin-walled portion (a protrusion protruding towards the end plate) is provided at the end of the mounting portion. A riveted portion is formed by riveting this thin-walled portion to the slits on the end plate.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2019-115217

[0005] While not described in Japanese Patent Application Publication No. 2019-115217, the oil flow path for cooling oil to circulate through the rotor core is often configured to extend axially near the inner periphery of the rotor core. In this case, it is assumed that the cooling oil will not be discharged to the outside of the rotor core because the axial end of the aforementioned oil flow path is blocked by the riveting portion protruding from the end plate side. Therefore, a rotor is desired that, when the rotor hub is riveted to the end plate, allows for easy discharge of cooling oil flowing through the oil flow path of the rotor core to the outside. Summary of the Invention

[0006] The present invention was made to solve the problems mentioned above. One object of the present invention is to provide a rotor in which cooling oil flowing in the oil flow path of the rotor core can be easily discharged to the outside when the rotor hub is riveted to the end plate.

[0007] To achieve the above objectives, one aspect of the rotor of the present invention comprises: a rotor core; a first end plate disposed on an end face of one axial side of the rotor core; a second end plate disposed on an end face of the rotor core on the other axial side; and a rotor hub comprising a cylindrical portion disposed adjacent to and fixing the rotor core to the rotor core on the radially inner side of the rotor core, the rotor core comprising a plurality of oil passages disposed extending axially and for through which first cooling oil for cooling the rotor core flows, the end face of the cylindrical portion of the rotor hub on one axial side comprising: a plurality of riveting portions riveted to the first end plate, and a portion configured to be circumferentially located on the rotor core. The first end plate includes multiple pairs of cutouts adjacent to the riveting portions on both sides of each of the multiple riveting portions. The first end plate includes a first opening portion formed by a hole or cutout near the inner periphery of the first end plate, which is located in the circumferential direction at a first position corresponding to the position of the cylindrical portion where the riveting portion is located and connected to a first oil flow path among the multiple oil flow paths. The second end plate includes a second opening portion formed by a hole or cutout near the inner periphery of the second end plate, which is located in the circumferential direction at a second position corresponding to the position of the cylindrical portion where the riveting portion is located and connected to a second oil flow path other than the first oil flow path among the multiple oil flow paths.

[0008] In one aspect of the rotor of the present invention, as described above, a first end plate includes a first opening in the circumferential direction, located at a first position corresponding to the position of the cylindrical portion where no riveting portion is provided, and connected to a first oil flow path. A second end plate includes a second opening in the circumferential direction, located at a second position corresponding to the position of the cylindrical portion where the riveting portion is provided, and connected to a second oil flow path. Therefore, at the first position corresponding to the position where no riveting portion is provided, the first opening of the first end plate is not axially covered (blocked) by the riveting portion, allowing the first cooling oil flowing in the first oil flow path to be discharged to the outside from the first opening. Furthermore, even if the riveting portion is located in a position that axially covers (blocks) the second oil flow path, the first cooling oil flowing in the second oil flow path can still be discharged from the second opening of the second end plate on the side opposite to the riveting portion. As a result, when the rotor hub is riveted to the first end plate, the first cooling oil flowing in the oil flow path of the rotor core can be easily discharged to the outside.

[0009] Furthermore, by providing multiple pairs of slits arranged adjacent to the riveting portions on both sides of their respective circumference, it is possible to prevent tensile stress from occurring radially on both sides of the riveting portions at the end of the cylindrical portion due to riveting (deformation by pushing radially outward). Additionally, by providing the slits, the area where load is applied through riveting can be reduced, thus enabling miniaturization of the load-applying device.

[0010] According to the present invention, when the rotor hub is riveted to the end plate, the cooling oil flowing in the oil passage of the rotor core can be easily discharged to the outside. Attached Figure Description

[0011] Figure 1 This is a cross-sectional view showing the structure of a rotary electric machine according to one embodiment.

[0012] Figure 2 This is a top view showing the structure of a rotor core according to one embodiment.

[0013] Figure 3 This is a top view showing the structure of a rotor (rotor hub) according to one embodiment.

[0014] Figure 4 This is a cross-sectional view of a rotor in a circumferential position (position P1) without riveting in one embodiment.

[0015] Figure 5 This is a cross-sectional view of a rotor with a circumferential position (position P2) where a riveting portion is provided, according to one embodiment. Detailed Implementation

[0016] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0017] Reference Figures 1-5 The rotor 100 of this embodiment will be described.

[0018] In this application specification, "axial" refers to the direction along the rotation axis C of the rotor 100 (see reference ). Figure 2 The direction of ) refers to the Z direction in the diagram. In addition, "radial" refers to the radial direction of rotor 100 (R1 direction or R2 direction), and "circumferential" refers to the circumferential direction of rotor 100 (E1 direction or E2 direction).

[0019] like Figure 1 As shown, the rotor 100 and stator 101 together constitute a rotary motor 102. Furthermore, both the rotor 100 and stator 101 are formed in annular shapes. Moreover, the rotor 100 is positioned radially inside the stator 101, opposite to the stator 101. That is, in this embodiment, the rotary motor 102 is configured as an inner rotor type rotary motor. Additionally, the rotor 100 includes a rotor shaft (not shown) connected to an engine, axle, etc., via a rotational force transmission component such as gears. The rotor core 1 transmits the rotational force of the rotor shaft and rotates around the rotation axis C (see reference φ). Figure 2 Rotation. For example, the rotary motor 102 is configured as a motor, generator, or a combination of motor and generator, and is configured to be mounted on a vehicle.

[0020] Furthermore, the rotor 100 includes a rotor core 1. The rotor core 1 is constructed by stacking multiple electromagnetic steel plates 1a. Additionally, the rotor core 1 includes multiple magnet insertion holes 2 extending along the stacking direction (Z direction) of the electromagnetic steel plates 1a. A permanent magnet 2a is inserted into each of the multiple magnet insertion holes 2.

[0021] like Figure 2 As shown, a plurality of magnet insertion holes 2 are provided in the rotor core 1 (32 in this embodiment). That is, the rotary motor 102 is configured as an interior permanent magnet motor (IPM motor).

[0022] Specifically, the rotor core 1 includes a plurality of pole forming portions 2b that form magnetic poles including a pair of magnet insertion holes 2 adjacent in the circumferential direction. In the rotor core 1, 16 pole forming portions 2b are arranged at equal angular intervals in the circumferential direction when viewed from the rotation axis C. Furthermore, the pair of magnet insertion holes 2 of the pole forming portions 2b are configured in a V-shape protruding radially inward (R1 side).

[0023] In addition, such as Figure 1 As shown, the rotor 100 includes an end plate 3a disposed on an end face 1b on one side (Z1 side) of the axial direction. Additionally, the rotor 100 includes an end plate 3b disposed on an end face 1c on the other side (Z2 side) of the axial direction. Both end plates 3a and 3b are provided to prevent the permanent magnet 2a from disengaging from the magnet insertion hole 2. Furthermore, end plates 3a and 3b are examples of the "first end plate" and "second end plate" of the technical solution, respectively.

[0024] Additionally, the rotor 100 includes a rotor hub 4. The rotor hub 4 includes a cylindrical portion 40. The cylindrical portion 40 is configured to be adjacent to the rotor core 1 on its radially inner side (R1 side). The cylindrical portion 40 that fixes the rotor core 1 is formed in a cylindrical shape.

[0025] Additionally, the rotor hub 4 includes a flange portion 42 welded (joined) to one axial side (Z1 side) end 41 of the cylindrical portion 40. The flange portion 42 is configured to cover the clutch portion 103 of the rotary motor 102 from one axial side (Z1 side). The flange portion 42 is configured to extend in a flange shape in a manner intersecting the axial direction. Furthermore, the clutch portion 103 is configured to engage with the cylindrical portion 40 (the spline portion 41g described later) on the radially inner side of the cylindrical portion 40.

[0026] Additionally, the cylindrical portion 40 includes a support portion 43 configured to support the rotor core 1 from the other axial side (Z2 side). The support portion 43 is configured to support the rotor core 1 from the inner periphery 1d (see reference). Figure 2 It extends radially outward from the vicinity of )

[0027] In addition, such as Figure 2 As shown, the rotor core 1 includes cooling oil 90 (refer to) that extends axially and cools the rotor core 1. Figure 4 as well as Figure 5 (The dashed arrow indicates the multiple oil flow paths 5). These multiple oil flow paths 5 are provided on the inner periphery 1d of the rotor core 1 and are formed by cuts extending axially. Specifically, the oil flow path 5 is formed by holes extending axially, created by the cylindrical portion 40 blocking the cuts on the inner periphery 1d of the rotor core 1 from the radially inward side. Furthermore, the cooling oil 90 is an example of the "first cooling oil" in the technical solution.

[0028] like Figure 3 As shown, the end 41 of the cylindrical portion 40 of the rotor hub 4 on one axial side (Z1 side) includes a plurality of riveting portions 41a that are riveted to the end plate 3a. Additionally, the end 41 includes a plurality of pairs of cutouts 41b arranged circumferentially adjacent to the riveting portions 41a on both sides of each of the riveting portions 41a. In this embodiment, the riveting portions 41a are formed by pushing the end 41 of the cylindrical portion 40 radially outward (see reference). Figure 5 It is formed by riveting it to the inner periphery 3c of the end plate 3a. Thus, the riveted part 41a can be easily formed simply by pushing the end 41 of the cylindrical part 40 toward the radially outward.

[0029] Therefore, by providing multiple pairs of slits 41b arranged adjacent to the riveting portions 41a on both sides of their respective circumference, it is possible to prevent radial tensile stress from being generated on both sides of the circumference of the riveting portions 41a in the end 41 of the cylindrical portion 40 due to riveting (deformation by pushing it radially outward). In addition, by providing the slits 41b, the area where the load is applied by riveting can be reduced, so the device (equipment) for applying the load can be miniaturized.

[0030] Furthermore, the circumferential width W1 of the riveting portion 41a is larger than the circumferential width W2 of the cut portion 41b. Additionally, the circumferential width W1 of the riveting portion 41a is smaller than the circumferential width W3 of the opening portion 42b (described later) and the width W4 of the opening portion 42c (described later), and is larger than half the widths W3 and W4. Furthermore, the opening portions 42b and 42c have the same shape. That is, the widths W3 and W4 are the same size.

[0031] Here, as Figure 4As shown, the end plate 3a includes a position P1 in the circumferential direction, corresponding to the position of the riveting portion 41a of the unconfigured cylindrical portion 40, and connected to the first oil flow path 5a of the plurality of oil flow paths 5, and an opening 3d provided near the inner periphery 3c of the end plate 3a. Furthermore, position P1 and opening 3d are examples of the "first position" and "first opening" of the technical solution, respectively. Additionally, in Figure 3 For convenience, only two of the positions in the circumferential direction, i.e., positions P1, are shown in the diagram, based on the number of openings 3d.

[0032] Furthermore, in this embodiment, the first oil flow path 5a is provided at position P1 and is formed by an axially extending hole 51a, which is blocked by the cylindrical portion 40 from the radially inward side through a cut in the inner periphery 1d of the rotor core 1, and is connected to the opening 3d of the end plate 3a. Thus, the first oil flow path 5a can be easily formed through the cut in the inner periphery 1d of the rotor core 1 and the cylindrical portion 40. Furthermore, the hole 51a is an example of a "first hole". Additionally, in this embodiment, the opening 3d is formed by a hole surrounded by a cut 31c provided in the inner periphery 3c of the end plate 3a and the end portion 41 on the outer diameter side of the rotor hub 4. Thus, the opening 3d can be easily formed through the cut 31c provided in the inner periphery 3c of the end plate 3a and the end portion 41 on the outer diameter side of the rotor hub 4. Furthermore, the cut 31c is an example of a "first cut" in the technical solution.

[0033] In addition, such as Figure 5 As shown, the end plate 3b includes a position P2 in the circumferential direction, corresponding to the position of the riveting portion 41a where the cylindrical portion 40 is disposed, and connected to a second oil flow path 5b other than the first oil flow path 5a among the plurality of oil flow paths 5, and an opening 3f is provided near the inner periphery 3e of the end plate 3b. Furthermore, position P2 and opening 3f are examples of the "second position" and "second opening" of the technical solution, respectively. Additionally, in Figure 3For simplicity, only two of the positions P2 in the circumferential direction, i.e., positions P2, are shown in the diagram, representing the number of riveted parts 41a. Furthermore, in this embodiment, a second oil flow path 5b is provided at position P2 and is constituted by an axially extending hole 51b, which connects to the opening 3f of the end plate 3b. This hole 51b is formed by blocking the cylindrical portion 40 from the radially inward side through a cut in the inner periphery 1d of the rotor core 1. Thus, the second oil flow path 5b can be easily formed through the cut in the inner periphery 1d of the rotor core 1 and the cylindrical portion 40. Furthermore, the hole 51b is an example of a "second hole." Additionally, in this embodiment, the opening 3f is constituted by a cut 31e provided in the inner periphery 3e of the end plate 3b and a hole surrounded by the end portion 43a on the outer diameter side of the rotor hub 4. Therefore, the opening 3f can be easily formed through the cut 31e provided in the inner periphery 3e of the end plate 3b and the end portion 43a on the outer diameter side of the rotor hub 4. Furthermore, cut 31e is an example of a "second cut" in the technical solution.

[0034] Therefore, at position P1 corresponding to the position where the riveting part 41a is not provided, the opening 3d of the end plate 3a is not axially covered (blocked) by the riveting part 41a, so the cooling oil 90 flowing in the first oil passage 5a can be discharged to the outside through the opening 3d. Furthermore, even if the riveting part 41 is provided in a position that axially covers (blocks) the second oil passage 5b, the cooling oil 90 flowing in the second oil passage 5b can be discharged from the opening 3f of the end plate 3b on the side opposite to the riveting part 41a. As a result, when the rotor hub 4 is riveted to the rotor core 1, the cooling oil 90 flowing in the oil passage 5 of the rotor core 1 can be easily discharged to the outside.

[0035] Furthermore, the opening 3d is formed by a cutout provided on the inner periphery 3c of the end plate 3a. Additionally, the opening 3f is formed by a cutout provided on the inner periphery 3e of the end plate 3b. Therefore, the opening 3d can be easily positioned close to the radially inner side in the end plate 3a. Similarly, the opening 3f can be easily positioned close to the radially inner side in the end plate 3b.

[0036] Furthermore, the radially outer end 3g of the opening 3f is located radially outer than the radially outer end 43a of the support portion 43 of the cylindrical portion 40. As a result, the opening 3f is not blocked by the support portion 43, so the cooling oil 90 can be discharged to the outside through the opening 3f.

[0037] In addition, such as Figure 4As shown, the cylindrical portion 40 includes a hole 41c for introducing cooling oil 90 from the first clutch 103a of the clutch portion 103 into the first oil flow path 5a. The hole 41c is provided at each of a plurality of positions P1. The cooling oil 90 introduced from the hole 41c into the first oil flow path 5a flows in the first oil flow path 5a and is discharged from the opening 3d of the end plate 3a to the outside of the rotor core 1. The first clutch 103a is axially located near the end plate 3b. The hole 41c is located radially opposite to the first clutch 103a. Specifically, the hole 41c is located radially opposite to the portion on the other side (Z2 side) of the rotor core 1 in the axial direction.

[0038] In addition, such as Figure 5 As shown, the cylindrical portion 40 includes a hole 41d for introducing cooling oil 90 from the first clutch 103a to the second oil flow passage 5b. The hole 41d is provided at each of a plurality of positions P2. The cooling oil 90 introduced from the hole 41d into the second oil flow passage 5b flows within the second oil flow passage 5b and is discharged from the opening 3f of the end plate 3b to the outside of the rotor core 1. The hole 41d is located radially opposite to the first clutch 103a. Specifically, the hole 41d is located radially opposite to the portion on the other side (Z2 side) of the rotor core 1 in the axial direction. Axially, the hole 41d is positioned approximately at the same location as the hole 41c.

[0039] In addition, such as Figure 3 As shown, the welded portion 41e in the end 41 of the cylindrical portion 40, which is welded to the flange portion 42, is arranged circumferentially in a manner that it is adjacent to each of the plurality of riveting portions 41a, separated by a cutout portion 41b. In other words, the welded portion 41e is configured to be separated from the riveting portion 41a by the cutout portion 41b. Furthermore, the welded portion 41e is an example of a "joint portion" in the technical solution.

[0040] This prevents the welded portion 41e of the cylindrical portion 40 from peeling off from the flange portion 42 due to the stress during riveting of the riveted portion 41a.

[0041] Furthermore, the flange portion 42 includes multiple protrusions 42a, each of which is configured to face toward the cylindrical portion 40 and protrude radially outward, and are welded to the corresponding welding portion 41e. Thus, the flange portion 42 and the cylindrical portion 40 can be welded together at a circumferential position where the protrusions 42a are provided, and the flange portion 42 can be separated from the cylindrical portion 40 at a circumferential position where the protrusions 42a are not provided.

[0042] Each of the plurality of protrusions 42a (welded portions 41e) is positioned circumferentially at a position P3 corresponding to a position other than position P1 and position P2. Specifically, position P3 is the position corresponding to the position between positions P1 and P2 that are adjacent to each other circumferentially. Furthermore, in Figure 3 For convenience, only two of the positions in the circumferential direction, i.e., positions P3, are shown in the figure, based on the number of protrusions 42a (welded portions 41e).

[0043] Additionally, the cylindrical portion 40 includes a key 6 to the rotor core 1 (see reference). Figure 2 The groove 41f engages with the cylinder. Two grooves 41f are provided at opposite positions about the axis of rotation C. Furthermore, at the locations where the grooves 41f are provided, the cylindrical portion 40 and the flange portion 42 are not welded.

[0044] Additionally, the flange portion 42 includes a plurality of openings 42b disposed at a position corresponding to position P2 in the circumferential direction and arranged to be adjacent to the riveting portion 41a radially inside it. The openings 42b are formed by cuts for disengaging a clamp (not shown) used during riveting of the riveting portion 41a. Furthermore, the openings 42b are an example of a "third opening" in the technical solution.

[0045] Therefore, the riveting operation can be performed while the riveting fixture is detached from the opening 42b, thus preventing interference between the riveting fixture and the flange 42.

[0046] Specifically, each of the plurality of openings 42b is formed by a cut provided on the outer periphery 42d of the flange portion 42.

[0047] Therefore, unlike the case where the opening 42b is composed of a hole, there is no part that serves as an obstacle (i.e., the outer periphery 42d of the flange 42) between the riveting part 41a and the opening 42b in the radial direction, so the riveting clamp can be easily disengaged from the opening 42b.

[0048] Furthermore, each of the plurality of openings 42b also serves as an opening through which cooling oil 91 for cooling the clutch section 103 passes. Moreover, the cooling oil 91 is an example of a "second cooling oil" in the technical solution.

[0049] Therefore, the opening through which the cooling oil 91 passes in the cooling clutch section 103 does not need to be separated from the opening 42b, thus simplifying the structure of the flange section 42.

[0050] Specifically, each of the plurality of openings 42b is configured to allow cooling oil 91 to pass through the second clutch 103b of the cooling clutch section 103. The second clutch 103b is configured to engage with the cylindrical section 40 on one axial side (Z1 side) of the first clutch 103a. Furthermore, the second clutch 103b is a clutch used in WSC (Wet Start Clutch) mode (a driving mode in which the second clutch 103b is slipped while the engine is included in the power source and the vehicle is driven with the first clutch 103a engaged).

[0051] Furthermore, the flange portion 42 includes a plurality of openings 42c disposed in the circumferential direction corresponding to position P1, through which cooling oil 91 passes. Thus, at the circumferential position P1, cooling oil 91 can be discharged to the outside through the openings 42c.

[0052] In addition, each of the plurality of openings 42c is the same as the opening 42b, and is formed by a cut provided on the outer periphery 42d of the flange 42.

[0053] The openings 42b and 42c, along with the protrusion 42a, are arranged alternately in the circumferential direction. Specifically, in the circumferential direction, they are arranged in the order of opening 42b, protrusion 42a, opening 42c, protrusion 42a, opening 42b… That is, the flange 42 is opened in the circumferential direction at all positions except where the protrusion 42a (the spline portion 41g described later) is located, through either opening 42b or opening 42c.

[0054] In addition, such as Figure 1 As shown, the cylindrical portion 40 includes a plurality of spline portions 41g that are configured to protrude toward and extend axially toward a clutch portion 103 disposed radially inward of the cylindrical portion 40 and engage with the clutch portion 103. Each of the plurality of spline portions 41g is disposed at position P3 in the circumferential direction at the welded portion 41e of the cylindrical portion 40.

[0055] Each of the multiple spline portions 41g is configured such that its end 41h on one side of the axial direction abuts against the flange portion 42.

[0056] Therefore, the flange portion 42 is supported from the other side of the axial direction by the spline portion 41g, so the flange portion 42 can be stably fixed.

[0057] Specifically, each of the plurality of spline portions 41g is configured to abut against the protrusion 42a of the flange portion 42 at its end 41h. That is, each of the plurality of protrusions 42a overlaps with the corresponding spline portion 41g when viewed from the axial direction.

[0058] Therefore, each of the plurality of openings 42b provided between the protrusions 42a of the flange portion 42 is configured such that, when viewed axially, they overlap with the areas between the spline portions 41g adjacent in the circumferential direction. Similarly, each of the plurality of openings 42c provided between the protrusions 42a of the flange portion 42 also overlaps with the areas between the spline portions 41g adjacent in the circumferential direction when viewed axially. Thus, cooling oil 91 flowing between the circumferentially adjacent spline portions 41g can be efficiently discharged from the openings 42b and 42c.

[0059] Furthermore, the spline portion 41g is formed by broaching. Broaching is a removal process that uses a long tool called a "broach" to cut away the surface or inner surface of a workpiece.

[0060] [Variation Example]

[0061] Furthermore, the embodiments disclosed herein should be considered illustrative rather than limiting in all respects. The scope of the invention is not derived from the description of the above embodiments but from the technical solutions shown, and includes all equivalent meanings and modifications within that scope.

[0062] For example, in the above embodiment, although an example is shown where the opening 3d (first opening) is formed by a cut provided in the inner peripheral edge 3c of the end plate 3a (first end plate), the present invention is not limited thereto. The opening 3d may also be formed by a hole provided near the inner peripheral edge 3c.

[0063] Furthermore, although the above embodiment shows an example where the opening 3f (second opening) is formed by a cut in the inner periphery 3e of the end plate 3b (second end plate), the present invention is not limited thereto. The opening 3f may also be formed by a hole provided near the inner periphery 3e.

[0064] Furthermore, although the above embodiment shows an example where the rotor hub 4 includes a cylindrical portion 40 and a flange portion 42 formed separately from each other, the present invention is not limited thereto. The cylindrical portion 40 and the flange portion 42 may also be integrally formed.

[0065] Furthermore, although the above embodiment shows an example of joining the end 41 of the cylindrical portion 40 to the flange portion 42 by welding, the present invention is not limited thereto. The end 41 of the cylindrical portion 40 to the flange portion 42 may also be joined by means other than welding (e.g., adhesive bonding).

[0066] Furthermore, although the above embodiment shows an example where each of the openings 42b (third opening) and 42c is formed by a cut provided on the outer periphery 42d of the flange 42, the present invention is not limited thereto. Each of the openings 42b and 42c may also be formed by a hole provided near the outer periphery 42d.

[0067] Furthermore, although the above embodiment shows an example of providing opening 42b (third opening) and opening 42c in the flange portion 42, the present invention is not limited thereto. For example, if only the first clutch 103a is provided without the second clutch 103b, then opening 42b and opening 42c may not be provided in the flange portion 42. Additionally, to allow the riveting clamp to disengage, only opening 42b of opening 42b and opening 42c may be provided in the flange portion 42.

[0068] Furthermore, although the above embodiment shows an example where the opening 42b (third opening) serves as both an opening for the passage of cooling oil 91 (second cooling oil) and an opening for disengaging the riveting clamp, the present invention is not limited thereto. It is also possible to provide separate openings for the passage of cooling oil 91 and for disengaging the riveting clamp.

[0069] Those skilled in the art will understand that the above exemplary embodiments are specific examples of the following embodiments.

[0070] Multiple third openings (42b) are configured to overlap with the areas of the spline portions (41g) adjacent to each other in the circumferential direction when viewed from the axial direction.

[0071] The flange portion (42) includes a plurality of protrusions (42a) that are configured to face toward the cylindrical portion (40) and protrude radially outward and engage with the corresponding joint portion (41e).

[0072] The flange (42) includes a fourth opening (42c) disposed in a position corresponding to the first position (P1) in the circumferential direction and through which the second cooling oil (91) passes.

[0073] The first opening (3d) and the second opening (3f) are respectively formed by cuts on the inner periphery (3c) of the first end plate (3a) and the inner periphery (3e) of the second end plate (3b).

[0074] Each of the plurality of third openings (42b) is formed by a cut provided on the outer periphery (42d) of the flange (42).

[0075] Description of the attached text

[0076] 1…Rotor core, 1b…End face (one side end face), 1c…End face (the other side end face), 3a…End plate (first end plate), 3b…End plate (second end plate), 3c…Inner periphery (inner periphery of the first end plate), 3d…Opening (first opening), 3e…Inner periphery (inner periphery of the second end plate), 3f…Opening (second opening), 4…Rotor hub, 5…Oil flow path, 5a…First oil flow path, 5b…Second oil flow path, 31c…Slit (first slit), 31e…Slit (second slit), 40…Cylindrical section , 41…end (end of cylindrical part), 41a…riveting part, 41b…cut part, 41e…welded part (joining part), 41g…spline part, 41h…end (end of spline part), 42…flange part, 42b…opening part (third opening part), 51a…hole (first hole), 51b…hole (second hole), 90…cooling oil (first cooling oil), 91…cooling oil (second cooling oil), 100…rotor, 103…clutch part, P1…position (first position), P2…position (second position).

Claims

1. A rotor comprising: Rotor core; The first end plate is disposed on one end face of the rotor core on one side of the axial direction. The second end plate is disposed on the end face of the rotor core on the other side of the aforementioned axial direction; and A rotor hub comprising a cylindrical portion disposed adjacent to and fixing the rotor core on the radially inner side of the rotor core. The aforementioned rotor core includes a plurality of oil flow paths configured to extend along the aforementioned axial direction and to allow first cooling oil for cooling the rotor core to flow through. The end of the cylindrical portion of the rotor hub on one side of the axial direction includes: a plurality of riveting portions riveted to the first end plate, and a plurality of pairs of cut portions arranged to be adjacent to the riveting portions on both sides of each of the plurality of riveting portions in the circumferential direction of the rotor core. The aforementioned first end plate includes: a first opening in the circumferential direction, located at a first position corresponding to the position of the cylindrical portion where the aforementioned riveting portion is not disposed, and connected to a first oil flow path among the aforementioned plurality of oil flow paths, and formed by a hole or cut provided near the inner periphery of the aforementioned first end plate, wherein the aforementioned first opening is not axially covered by the aforementioned riveting portion at the aforementioned first position. The second end plate includes: a second opening in the circumferential direction, which is provided at a second position corresponding to the position where the riveting part is arranged in the cylindrical portion, and is connected to a second oil flow path other than the first oil flow path among the plurality of oil flow paths, and is formed by a hole or cut provided near the inner periphery of the second end plate. When the riveting part is provided in a position that blocks the second oil flow path from the axial direction, the second opening can discharge the first cooling oil flowing in the second oil flow path from the second opening on the side of the second end plate opposite to the riveting part.

2. The rotor according to claim 1, wherein, The first oil flow path is provided at the first position and is formed by a first hole extending along the axial direction and connected to the first opening of the first end plate. The first hole is formed by the cylindrical portion blocking the inner side of the rotor core through a cut in the inner periphery.

3. The rotor according to claim 1 or 2, wherein, The second oil passage is provided at the second position and is formed by a second hole extending along the axial direction, and is connected to the second opening of the second end plate. The second hole is formed by the cylindrical portion blocking the inner side of the rotor core through a cut in the inner periphery.

4. The rotor according to any one of claims 1 to 3, wherein, The first opening is formed by a hole formed by a first cut provided on the inner periphery of the first end plate and the end of the rotor hub on the outer diameter side.

5. The rotor according to any one of claims 1 to 4, wherein, The second opening is formed by a hole formed by a second cut provided on the inner periphery of the second end plate and the end of the rotor hub on the outer diameter side.

6. The rotor according to any one of claims 1 to 5, wherein, The aforementioned riveting portion is formed by pushing the end of the aforementioned cylindrical portion radially outward and riveting it to the inner periphery of the aforementioned first end plate.

7. The rotor according to any one of claims 1 to 6, wherein, The rotor hub includes a flange portion that engages with the end portion on one side of the axial direction of the cylindrical portion. The joint portions at the ends of the cylindrical portion that engage with the flange portion are arranged in a circumferential manner, with each of the plurality of riveting portions adjacent to the cut portion in the circumferential direction.

8. The rotor according to claim 7, wherein, The flange portion includes: a plurality of third openings disposed in the circumferential direction at a position corresponding to the second position and arranged to be adjacent to the riveting portion on the radially inner side of the riveting portion, and formed by holes or cuts for disengaging the clamp used to rivet the riveting portion.

9. The rotor according to claim 8, wherein, Each of the aforementioned plurality of third openings also serves as an opening through which second cooling oil passes to cool the clutch portion that engages with the aforementioned cylindrical portion on its radially inner side.

10. The rotor according to any one of claims 7 to 9, wherein, The aforementioned cylindrical portion includes: a plurality of spline portions that protrude toward a clutch portion disposed radially inside the aforementioned cylindrical portion and extend along the aforementioned axial direction, and engage with the aforementioned clutch portion. Each of the aforementioned spline portions is configured such that its end on one side of the aforementioned axial direction abuts against the aforementioned flange portion.

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