JP2019057987A - Rotor and method for manufacturing the same - Google Patents

Abstract

To provide a rotor capable of preventing deterioration in rotation power that can be transmitted between a rotor core and a rotation transmission member, and a method for manufacturing the same.SOLUTION: A rotor 100 includes: a first weld section 60 that is a weld section of a rotor core 10, a hub member 20, and an end plate 40; and a second weld section 70 that is formed while being consecutively welded by the first weld section 60. The second weld section 70 includes a weld completion mark 71 that is formed when heat input into a weld portion is completed. The weld completion mark 71 is formed at a position that is different from the first weld section 60 and at any of the hub member 20, the end plate 40, or a position where the hub member 20 and the end plate 40 are joined.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a rotor and a method for manufacturing the rotor.

  Conventionally, a rotor including a rotor core in which a plurality of electromagnetic steel plates are laminated and a rotation transmission member is known (see, for example, Patent Document 1).

  Patent Document 1 discloses a rotor including a cylindrical shaft body (rotation transmission member) and an annular rotor core in which a plurality of electromagnetic steel plates are laminated. This rotor is provided with an annular end plate provided at both ends of the rotor core in the direction of the rotation axis. The shaft body is arranged on the inner diameter side of the rotor core and the end plate so that the outer surface of the cylindrical shaft body and the inner surface of the annular rotor core and the inner surface of the annular end plate abut each other. Yes. The shaft body and the rotor core are fixed by welding the outer surface of the cylindrical shaft body and the inner surface of the rotor core. Further, the outer surface of the cylindrical shaft body and the inner surface of the annular end plate are welded, whereby the shaft body and the end plate are welded.

  A plurality of welds, which are portions where the outer surface of the cylindrical shaft body and the inner surface of the annular rotor core are welded as viewed from the rotational axis direction, are provided in a state of being separated from each other along the circumferential direction. ing. Craters formed of concave portions that are recessed in the direction of the rotation axis formed when heat input to the melted portion is completed are provided at the ends of the plurality of welds (welding end portions). In this rotor, the rotational force (torque) generated by the rotor core is transmitted to the shaft body by the plurality of welds in which the craters are formed.

JP2015-119557A

  Here, in the crater formed in the welded portion, the crater may be cracked (cracked) due to tensile stress due to solidification of the melted portion. If a cracked crater is provided at the end of the weld, stress concentration is more likely to occur at the end of the weld than at the center, and it is difficult to ensure the joint strength between the rotor core and the shaft. .

  Therefore, in order to ensure the joint strength between the rotor core and the shaft body, welding is performed toward one side in the circumferential direction, and then folded back to the other side in the circumferential direction to weld the crater to one side in the circumferential direction of the welded portion. It is conceivable that it is formed on the other side in the circumferential direction from the end portion. Thereby, since a crater is not formed in the circumferential direction edge part of a welding part, it can relieve | moderate that stress concentrates on a crater part.

  However, in the conventional rotor described above, stress concentration on the crater portion can be mitigated. On the other hand, since the crater is on the welded portion, the stress is still concentrated on the crater portion as compared with the welded portion other than the crater portion. It is easy and it is difficult to prevent the rotational force that can be transmitted by the welded portion from being lowered.

  The present invention has been made to solve the above-described problems, and one object of the present invention is to prevent a decrease in the rotational force that can be transmitted between the rotor core and the rotation transmission member. And providing a rotor manufacturing method.

  In order to achieve the above object, the rotor according to the first aspect of the present invention is rotated about the rotation axis, and a plurality of electromagnetic steel plates are stacked in the rotation axis direction, which is the direction in which the rotation axis extends, and A rotor core having a through hole, a rotation transmission member provided in the through hole of the rotor core, an end plate provided at an end of the rotor core in the rotation axis direction, and a portion where the rotation transmission member, the rotor core, and the end plate are welded A first welded portion and a second welded portion formed by being continuously melted in the first welded portion, and the second welded portion is when the heat input to the melted portion is completed. The melting end mark is formed at a position different from that of the first weld, and the rotation transmission member, the end plate, or the rotation transmission member and the end plate are joined. Position, are formed on either.

  In the rotor according to the first aspect of the present invention, as described above, the melting end mark is located at a position different from the first welded portion, and the rotation transmission member, the end plate, or the rotation transmission member and the end plate. It is formed at any one of the positions to be joined. Thereby, a fusion end mark (crater) is not formed in a portion (first welded portion) where the rotation transmission member, the rotor core, and the end plate where the rotation force is transmitted between the rotation transmission member and the rotor core are joined. As a result, it is possible to prevent stress concentration in the first weld due to the provision of a melting end mark, and thus it is possible to prevent a reduction in the rotational force that can be transmitted between the rotor core and the rotation transmission member. .

  Further, as described above, the first welded portion, which is a portion where the rotation transmission member, the rotor core, and the end plate are welded, is provided on the rotor. This eliminates the need to separately form a welded portion between the rotation transmission member and the rotor core, a welded portion between the rotor core and the end plate, and a welded portion between the rotation transmission member and the end plate. Can be reduced.

  A rotor manufacturing method according to a second aspect of the present invention is a rotor core that is rotated about a rotational axis, a plurality of electromagnetic steel plates are stacked in a rotational axis direction that is a direction in which the rotational axis extends, and has a through hole at the rotational center. And a rotation transmission member provided in a through hole of the rotor core, and an end plate provided at an end portion of the rotor core in the rotation axis direction, the rotation transmission member, the rotor core, and the end plate comprising: It is continuously performed after the step of forming the first welded portion by welding and the step of forming the first welded portion, continuously from the first welded portion to the rotor core, and the rotation transmission member, the rotor core, and the end plate And forming a second welded portion by melting at least one of the first welded portion, and the step of forming the second welded portion is different from the first welded portion. At the position and at the position where the rotation transmission member, the end plate, or the position where the rotation transmission member and the end plate are joined, the heat input to the melted portion is terminated, thereby completing the melting end mark. Is a step of forming.

  The rotor manufacturing method according to the second aspect of the present invention is configured as described above, whereby the rotor manufacturing method capable of preventing a decrease in the rotational force that can be transmitted between the rotor core and the rotation transmitting member can be prevented. Can be provided.

  According to the present invention, as described above, it is possible to prevent a reduction in the rotational force that can be transmitted between the rotor core and the rotation transmission member.

It is sectional drawing (sectional drawing in alignment with line 500-500 of FIG. 2) of the rotary electric machine by 1st Embodiment of this invention. It is the top view which looked at the rotor by 1st Embodiment of this invention from the rotating shaft direction. It is sectional drawing along the radial direction of the rotor for demonstrating the core welding part and 2nd welding part by 1st Embodiment of this invention. FIG. 3 is a partially enlarged view of FIG. 2. It is sectional drawing along the radial direction of the rotor for demonstrating the 1st welding part by 1st Embodiment of this invention. It is sectional drawing along the radial direction of the rotor for demonstrating the oil-path recessed part by 1st Embodiment of this invention. It is sectional drawing along the circumferential direction of the rotor for demonstrating the 1st welding part and 2nd welding part by 1st Embodiment of this invention. It is a figure for demonstrating formation of the 1st welding part and 2nd welding part by 1st Embodiment of this invention. It is sectional drawing along the circumferential direction of the rotor by 2nd Embodiment of this invention. It is the top view which looked at the rotor by 3rd Embodiment of this invention from the rotating shaft direction. It is the top view which looked at the rotor by 4th Embodiment of this invention from the rotating shaft direction.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
(Structure of rotating electrical machine)
With reference to FIGS. 1-7, the structure of the rotary electric machine 1 (rotor 100) by this embodiment is demonstrated.

  In the present specification, the “rotation axis direction” means a direction (Z direction, see FIG. 1) along the rotation axis C of the rotor 100 (rotor core 10). The “circumferential direction” means the circumferential direction of the rotor 100 (rotor core 10) (in the direction of arrow A1 or arrow A2, see FIG. 2). Further, the “inner diameter side” means a direction side (in the direction of arrow B1, see FIG. 2) toward the rotation axis C of the rotor 100 (rotor core 10) in the radial direction. The “outer diameter side” means a direction side away from the rotation axis C of the rotor 100 (rotor core 10) (direction of arrow B2, see FIG. 2).

  As shown in FIG. 1, the rotating electrical machine 1 includes a stator 2 and a rotor 100. The stator 2 includes a stator core 2a and a winding 2b wound around the stator core 2a. The rotor 100 includes a rotor core 10, a hub member 20, a plurality of permanent magnets 30, and two end plates 40. The stator core 2a and the rotor core 10 are disposed so as to face each other in the radial direction. For example, the rotor 100 is configured as an inner rotor. The hub member 20 is an example of the “rotation transmission member” in the claims.

  The rotor core 10 has an annular shape. The rotor core 10 is formed by being rotated about the rotation axis C and a plurality of electromagnetic steel plates 11 are stacked in the axial direction (Z direction) that is the direction in which the rotation axis C extends. Further, the rotor core 10 is provided with a through hole 10a at the center of rotation. As shown in FIG. 2, the rotor core 10 is provided with holes 12. A permanent magnet 30 is embedded in the hole 12. A plurality of (for example, 16) holes 12 are provided along the circumferential direction of the annular rotor core 10. The permanent magnet 30 has, for example, a substantially rectangular shape extending in the circumferential direction when viewed from the rotational axis direction, and one permanent magnet 30 constitutes one pole (magnetic pole).

  As shown in FIG. 3, in the present embodiment, the rotor 100 is provided with a core welded portion 50 that is a portion where the side surfaces 11 a of the plurality of electromagnetic steel plates 11 of the rotor core 10 are welded together. Further, as shown in FIG. 4, the rotor core 10 (the electromagnetic steel plate 11) protrudes inward in the radial direction when viewed from the rotational axis direction, and the core welding convex portion 13 in which the core weld 50 is formed, and the core welding. And an oil passage recess 14 that is provided so as to be adjacent to the circumferential direction of the protrusion 13 and that is recessed outward in the radial direction. The oil passage recess 14 is provided on both sides of the core welding projection 13 in the circumferential direction. For example, the core welding convex portion 13 is provided at a position on the inner diameter side of each of the plurality of permanent magnets 30.

  In the present embodiment, the oil passage recess 14 forms a flow path through which a cooling fluid (refrigerant) for cooling the rotor core 10 flows. As the cooling fluid, for example, a cooling oil (AFT: Automatic Transmission Fluid) circulated inside the engine or the transmission is used. In addition, the oil passage recessed part 14 which comprises a flow path is provided ranging from the edge part 10b of the Z1 direction side of the rotor core 10 to the edge part 10c (refer FIG. 6) of the Z2 direction side in the rotation axis direction. In addition, the oil passage recess 14 suppresses the influence (such as welding heat and deformation) of the core weld 50 on the rotor core 10 when the core weld 50 is formed on the core welding protrusion 13. It has a function. The core weld 50 and the oil passage recess 14 are not portions that are welded to the hub member 20 and are not portions that transmit torque.

  As shown in FIG. 4, the rotor core 10 is provided with a core convex portion 15 that protrudes from the inner side surface 10 d toward the inner diameter side. The core convex portion 15 is disposed at a position that is different from the core welded portion 50 and the oil passage concave portion 14 in the circumferential direction, and is opposed to a hub concave portion 22b described later in the radial direction. And the core convex part 15 is comprised so that it may engage with the hub recessed part 22b. By engaging the core convex portion 15 and the hub concave portion 22b, the circumferential relative positions of the rotor core 10 and the hub member 20 are positioned (phased).

  The hub member 20 is attached to the through hole 10a of the rotor core 10 as shown in FIG. A rotating shaft 21 is attached to the inner diameter side of the hub member 20 of the rotor core 10. Specifically, the hub member 20 includes a portion 22 having a cylindrical shape, and a connection portion 23 that connects the portion 22 having a cylindrical shape and the rotating shaft 21. As shown in FIG. 5, the inner side surface 10 d of the rotor core 10 is in contact with the outer side surface 22 a of the portion 22 of the hub member 20.

  As shown in FIG. 4, the hub member 20 is provided with a hub recess 22b that is recessed from the outer surface 22a toward the inner diameter side. The hub recess 22 b is provided at a circumferential position that engages with the core protrusion 15 and the end plate protrusion 41. Then, with the hub recess 22b, the core projection 15 and the end plate projection 41 engaged, the circumferential positions of the hub recess 22b, the core projection 15 and the end plate projection 41 are positioned (phase determination). ) The hub recess 22b is an example of the “rotation transmitting member side recess” in the claims.

  As shown in FIG. 4, the portion 22 of the hub member 20 is provided with a through hole 22c that penetrates from the inner diameter side to the outer diameter side. The through hole 22c is provided at a position facing the oil passage recess 14 in the radial direction, and is configured to allow the oil passage recess 14 to communicate with the cooling fluid. The hub member 20 is configured such that the cooling fluid that has flowed from the inner diameter side of the portion 22 flows into the oil passage recess 14 through the through-hole 22c due to the centrifugal force generated by the rotation of the rotor 100.

  The end plate 40 is formed of a stainless steel plate. As shown in FIG. 2, the end plate 40 has an annular shape. For example, as shown in FIG. 3, the end plate 40 includes an end plate 40 a provided at one end 10 b in the rotation axis direction of the rotor core 10, and an end 10 c on the other side in the rotation axis direction of the rotor core 10. It consists of the end plate 40b provided. The end plate 40 a is in contact with the end portion 10 b (end surface) of the rotor core 10. The end plate 40b is in contact with the end 10c of the rotor core. Hereinafter, the end plates 40a and 40b will be described as the end plates 40 unless particularly distinguished.

  Further, as shown in FIG. 4, the inner side surface 40 c of the end plate 40 is in contact with the outer side surface 22 a of the hub member 20. The inner side surface 40c is provided with an end plate convex portion 41 that protrudes toward the inner diameter side and engages with the hub concave portion 22b. The end plate convex portion 41 is an example of the “core side convex portion” in the claims.

<Configuration of first welded portion and second welded portion>
Here, in the first embodiment, as shown in FIG. 4, the rotor 100 is provided with a first weld 60 that is a portion where the hub member 20, the rotor core 10, and the end plate 40 are welded. Further, the rotor 100 is provided with a second welded portion 70 formed by being continuously melted in the circumferential direction by the first welded portion 60. The second welded portion 70 includes a melting end mark 71 formed when heat input to the melted portion is completed. Further, as will be described later, the melting end mark 71 is a position different from the first welded portion 60 and a position at which the hub member 20 or the end plate 40 or the hub member 20 and the end plate 40 are joined. , Is formed in either.

  Further, as shown in FIGS. 3 and 5, the first welded portion 60 and the second welded portion 70 are configured such that, in the rotational axis direction, the end portion 10 b side on the one axial side and the end portion on the other axial side of the rotor core 10. 10c side. Moreover, since the 1st welding part 60 and the 2nd welding part 70 of the axial direction one side and the 1st welding part 60 and the 2nd welding part 70 of the other axial direction are comprised similarly, one axial direction The first welded portion 60 and the second welded portion 70 on the side (arrow Z1 direction side) will be described, and the description of the first welded portion 60 and the second welded portion 70 on the other side in the axial direction (arrow Z2 direction side) will be omitted. To do.

  As shown in FIG. 2, a plurality of first welds 60 and second welds 70 are provided. When viewed from the rotational axis direction, the plurality of first welded portions 60 are formed, for example, on the inner diameter side between the adjacent permanent magnets 30 in the circumferential direction of the rotor core 10. Further, the plurality of second welded portions 70 are formed on the inner diameter side of the permanent magnet 30, for example. The first welded portion 60 and the second welded portion 70 are formed in an arc shape along the inner side surface 40c of the end plate 40 as viewed in the direction of the arrow Z2.

  Both the first weld 60 and the second weld 70 are formed by, for example, high energy beam welding (laser light, electron beam, etc.). For example, when a keyhole is formed in a member to be welded by melting at least one of the hub member 20, the rotor core 10, and the end plate 40 with laser light (see FIG. 8), The 1st welding part 60 and the 2nd welding part 70 are formed by solidifying.

  As shown in FIG. 4, the first welded portion 60 is provided so as to straddle the inner side surface 40 c of the end plate 40, the inner side surface 10 d of the rotor core 10, and the outer side surface 22 a of the hub member 20. For example, as shown in FIG. 5, the first weld 60 has a substantially triangular cross-sectional shape that gradually tapers from the axially outer end face 40 d of the end plate 40 toward the axially inner side. The end plate 40, the rotor core 10, and the hub member 20 are joined and fixed by the first welding portion 60. The first welding portion 60 functions as a torque transmission portion that transmits torque (rotational force) between the rotor core 10 and the hub member 20 by joining the rotor core 10 and the hub member 20.

  As shown in FIG. 4, the second welded portion 70 is formed continuously on the arrow A2 direction side of the first welded portion 60. For example, the second welded portion 70 is formed at a position that overlaps the oil passage recess 14 adjacent to the first welded portion 60 and the core welded portion 50 when viewed in the arrow Z2 direction. And the 2nd welding part 70 is provided so that the inner surface 40c of the end plate 40 and the outer surface 22a of the hub member 20 may be straddled. That is, since the rotor core 10 and the hub member 20 are not welded in the second welded portion 70, the second welded portion 70 does not have a function as a torque transmitting portion. As shown in FIG. 6, the second welded portion 70 has a substantially triangular cross-sectional shape that gradually tapers from the end surface 40 d on the outer side in the axial direction of the end plate 40 toward the inner side in the axial direction.

  As shown in FIG. 4, the first welded portion 60 and the second welded portion 70 are formed in order from a portion on the arrow A1 direction side of the first welded portion 60 to a portion on the arrow A2 direction side of the second welded portion 70. Yes. That is, the end on the arrow A1 direction side of the first welding portion 60 is formed as a melting start end portion 61, and the end portion on the arrow A2 direction side of the second welding portion 70 is formed as a melting end portion 72. Yes.

<Composition of melting end mark>
As shown in FIG. 4, a melting end mark 71 is formed in the second welded portion 70. The melting end mark 71 is a crater that is formed in the vicinity of the melting end portion 72 and is recessed in the rotation axis C direction (Z direction). That is, the melt end mark 71 is solidified and contracted in order from the first welded portion 60 side when the heat input by the welding heat source 110 (see FIG. 8) is finished, and the second welded portion 70 is shrunk. It is a crater (concave part) formed in the part by which the fusion | melting part used as it is finally solidified. The melting end mark 71 is formed in a circular shape when viewed in the arrow Z2 direction. Further, as shown in FIG. 7, the melting end mark 71 has a dent depth d <b> 1 on the arrow Z <b> 2 direction side with respect to the end surface 40 d on the axially outer side of the end plate 40. The recess depth d1 is smaller than the thickness t1 of the end plate 40 in the direction of the rotation axis C.

  In the first embodiment, the melting end mark 71 is at a position different from the position where the hub member 20 and the rotor core 10 are joined, and at least one of the hub member 20, the rotor core 10, and the end plate 40. Formed in one. Specifically, the melting end trace 71 is provided at a position overlapping with the oil passage recess 14 formed as a passage through which the cooling fluid flows as seen in the direction of the arrow Z2.

  Preferably, in the first embodiment, the melting end mark 71 is provided at a position that overlaps the oil passage recess 14 without overlapping the core weld 50. That is, the melting end mark 71 is formed at a circumferential position different from the torque transmission portion. The oil passage recess 14 has a function as an escape groove that prevents the rotor core 10 and the hub member 20 from being welded.

  For example, as shown in FIG. 7, the end 14a on the arrow A2 direction side of the oil passage recess 14 on the arrow A2 direction side of the two oil passage recesses 14 arranged with the core weld 50 sandwiched in the circumferential direction, The distance (length) in the circumferential direction between the oil passage recess 14 on the arrow A1 direction side and the end 14b on the arrow A1 direction side is L1. Moreover, the distance (length) of the circumferential direction of the edge part 14a and the front-end | tip part 50a of the radial inside of the core welding part 50 is L2. The melting end mark 71 has a length L3 smaller than the length L1 in the circumferential direction. Preferably, the length L3 of the melting end mark 71 is smaller than the length L2.

<Configuration of end-side melt slope and start-end side melt slope>
As shown in FIG. 7, in the first embodiment, the melting depth d2 of the second welded portion 70 is smaller than the melting depth d3 of the first welded portion 60 in the rotation axis C direction (Z direction). Specifically, the first weld 60 has a melting depth d3 that is greater than the thickness t1 of the end plate 40 in the direction of the rotation axis C. Thereby, the 1st welding part 60 is formed ranging over the some electromagnetic steel plate 11 arrange | positioned from the end surface 40d of the end plate 40 to the end plate 40 side of the rotor core 10, and makes the end plate 40 and the rotor core 10 into a Z direction. It is joined.

  Further, the second welded portion 70 has a melting depth d2 that is smaller than the thickness t1 of the end plate 40. Accordingly, the second welded portion 70 is not formed beyond the end plate 40 in the axial direction, and is not formed on the rotor core 10. Further, the connection portion 63 where the first welded portion 60 and the second welded portion 70 are connected in the circumferential direction has a melting depth from d3 to d2 from the first welded portion 60 side toward the second welded portion 70 side. It is formed to gradually become smaller.

  In the first embodiment, the second welding portion 70 has a terminal-side melting slope portion 73 that gradually decreases in a slope shape from d2 to 0 in the direction away from the first welding portion 60. Is provided. The end side melting slope portion 73 is formed to be inclined with respect to the end surface 40 d of the end plate 40 and the rotation axis C. For example, the second welded portion 70 has a melt depth d2 at a circumferential position P1 closer to the first welded portion 60 than the melt end portion 72, and gradually from the circumferential position P1 toward the melt end portion 72. A terminal side melting slope portion 73 is formed to reduce the melting depth. Further, the melting end portion 72 is formed on the arrow A1 direction side with respect to the circumferential position P2 of the end portion 14a on the arrow A2 direction side of the oil passage recess 14. In the specification of the present application, “slope” is described as meaning an approximately straight line that is inclined with respect to a predetermined plane.

  In addition, the first welding portion 60 is provided with a start-end-side melting slope portion 62 that gradually increases in a slope shape from 0 to d1 in the direction of approaching the second welding portion 70. For example, the second welded portion 70 has a melting depth d2 at a circumferential position P1 closer to the first welded portion 60 than the melting end portion 72, and toward the melting end portion 72 from the circumferential position P1. A melting slope portion 73 is formed. Moreover, the inclination angle with respect to the end surface 40 d of the start end side melting slope portion 62 is larger than the inclination angle with respect to the end surface 40 d of the end side melting slope portion 73.

(Method for manufacturing rotor)
Next, a method for manufacturing the rotor 100 according to the first embodiment will be described.

<Arrangement process of rotor core, hub member, and end plate>
First, a plurality of electromagnetic steel plates 11 are punched out by a press working device (not shown). At this time, as shown in FIG. 4, the magnetic steel sheet 11 is formed as an inner surface 10 d (through hole 10 a), a hole 12, a core welding projection 13, and a passage through which a cooling fluid flows. An oil passage recess 14 and a core protrusion 15 are formed. And the some electromagnetic steel plate 11 is laminated | stacked on a rotating shaft direction. Then, as shown in FIG. 3, the side surfaces 11a of the plurality of electromagnetic steel plates 11 (side surfaces 11a on the inner diameter side) are welded along the Z direction, for example, by high energy beam welding (laser, electron beam, etc.). The core weld 50 is formed. Thereafter, the permanent magnet 30 is inserted into the hole 12.

  Next, the end plates 40a and 40b are disposed at the end portions 10b and 10c in the rotation axis direction of the rotor core 10, respectively. Here, as shown in FIG. 4, the end plate 40 is disposed on the rotor core 10 in a state where the circumferential positions of the core convex portion 15 of the rotor core 10 and the end plate convex portion 41 of the end plate 40 coincide with each other.

  Next, the hub member 20 is inserted into the through hole 10 a of the rotor core 10. Here, the hub member 20 extends into the through hole 10a along the Z direction so that the core convex portion 15 of the rotor core 10 and the end plate convex portion 41 of the end plate 40 are engaged with the hub concave portion 22b of the hub member 20. Inserted. Thereby, the circumferential direction positions of the rotor core 10, the hub member 20, and the end plate 40 are fixed to each other.

<Process for forming welds and melted marks>
Next, as shown in FIG. 4, in the first embodiment, the hub member 20, the rotor core 10, and the end plate 40 are welded to form the first welded portion 60. Then, the second welded portion 70 is formed continuously from the first welded portion 60 in the circumferential direction of the rotor core 10 (arrow A2 direction). When the second welded portion 70 is formed, the hub member 20 and the end plate 40 of the hub member 20, the rotor core 10, and the end plate 40 are melted, and the heat input to the melted portion is terminated, thereby A melting end mark 71 is formed on the end plate 40 at a position different from the one welded portion 60 and formed when heat input to the melted portion is completed.

  Specifically, as shown in FIG. 8, from the outer side of the end plate 40 in the rotation axis C direction (arrow Z1 direction side), the inner side surface 10d of the rotor core 10, the inner side surface 40c of the end plate 40, and the outside of the hub member 20 In the vicinity of the side surface 22a (see FIG. 4), irradiation of the high energy beam is started by the welding heat source 110, and the end plate 40 and the rotor core 10 of the portion (circumferential position P3) that becomes the melting start end portion 61 are melted. Thus, a keyhole is formed.

  Then, the welding heat source 110 is moved at a constant speed in the direction of arrow A2, the irradiation position of the high energy beam is moved in the circumferential direction, and the output of the high energy beam is gradually increased, so that the depth of the keyhole is reduced. It is gradually increased from 0 to d11. Thereby, the part used as the start end side melt slope part 62 (refer FIG. 7) is fuse | melted. Then, when the melted portion is solidified, a starting end side melting slope portion 62 is formed in which the melting depth gradually increases from 0 to d3 in the arrow A2 direction.

  Then, in the state where the keyhole depth is d11, the three members of the rotor core 10, the end plate 40, and the hub member 20 are melted along the circumferential direction, and the melted portion is solidified, whereby the melting depth is obtained. A first weld 60 having d3 is formed. Then, by gradually reducing the output of the high energy beam, the irradiation position of the high energy beam moves in the arrow A2 direction while reducing the depth of the keyhole from d11 to d12 smaller than the thickness t1 of the end plate 40. As a result, the connection portion 63 is formed. By solidifying the melted portion, the connection portion 63 is formed so that the melting depth gradually decreases from d3 to d2 in the direction of the arrow A2.

  Then, while irradiating the high energy beam, irradiation is performed at a position overlapping the oil passage recess 14 when viewed from the rotational axis direction in a state of the keyhole depth d12 smaller than the axial thickness t1 of the end plate 40. The position is moved. Thereby, the rotor core 10 is not melted, while the hub member 20 and the end plate 40 are melted. Since the depth d12 of the keyhole does not exceed the thickness t1 of the end plate 40, the melted portion of the end plate 40 is prevented from being melted down to the oil passage recess 14 side.

  In the first embodiment, the heat input by the welding heat source 110 is gradually reduced toward the direction away from the first weld 60, thereby causing the second weld 70 to move away from the first weld 60. On the other hand, a terminal-side melt slope portion 73 whose melt depth gradually decreases from d2 to 0 is formed. Specifically, when viewed in the direction of the arrow Z2, the position of the two oil passage recesses 14 adjacent to the core weld 50 overlapping the oil passage recess 14 far from the first weld 60 (circumferential position P1) Therefore, the output of the high energy beam is gradually reduced, and the depth of the keyhole is gradually reduced from d12 to 0. And the irradiation position of a high energy beam is moved to the position (or vicinity) used as the fusion | melting termination | terminus part 72 in the arrow A2 direction.

  The second welded portion 70 having a melt depth d2 smaller than the melt depth d1 of the first welded portion 60 is formed in the melted portion of the hub member 20 and the end plate 40, and the melted portion. When the heat input to is completed, a melting end mark 71 (crater) is formed which is recessed in the rotation axis direction. Then, a terminal-side melting slope portion 73 that gradually decreases from the melting depth d2 to 0 is formed from the circumferential position P1 of the second welded portion 70 toward the melting end portion 72. When viewed in the direction of the arrow Z2, for example, a melt end mark 71 having a dent depth d1 is formed at a position that does not overlap the core weld 50 and a position that overlaps the oil passage recess 14.

  The rotor core 10, the hub member 20, and the end plate 40 are joined by the plurality of first welds 60, and the hub member 20 and the end plate 40 are joined by the plurality of second welds 70. . Then, the rotor 100 is completed, and the rotor 100 and the stator 2 are assembled to complete the rotating electrical machine 1.

[Second Embodiment]
Next, as shown in FIG. 9, a rotor 200 according to the second embodiment will be described. In the rotor 200 according to the second embodiment, unlike the rotor 100 according to the first embodiment in which the starting end side melt slope portion is formed in the welded portion, the first end portion is formed continuously on both sides in the circumferential direction of the first welded portion 260. One end of the two welded portions 270 is provided with a start side melt slope portion 272. Moreover, in the following description, about the structure similar to 1st Embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 9, the rotor 200 according to the second embodiment is continuous to the first welded portion 260 where the rotor core 10, the hub member 20, and the end plate 40 are welded, and to both sides in the circumferential direction of the first welded portion 260. And a second welded portion 270 formed.

  The second welded portion 270 is formed at a position that overlaps the oil passage recess 14 and the core welded portion 50 in the Z direction, similarly to the second welded portion 70 of the first embodiment. That is, the second welded portion 270 is a joint portion between the hub member 20 and the end plate 40. And in the 2nd welding part 270, the rotor core 10 and the hub member 20 are not welded, and the 2nd welding part 270 does not have a function as a torque transmission part.

  In 2nd Embodiment, the 2nd welding part 270 is formed in the fusion | melting termination | terminus side, the terminal side 2nd welding part 270a continuously formed in the arrow A2 direction side of the 1st welding part 260, and the fusion | melting start end side. And a start-end-side second welded portion 270b formed continuously on the arrow A1 direction side of the first welded portion 260. The terminal end side second welded portion 270a is formed in the same manner as the second welded portion 70 of the rotor 100 according to the first embodiment, and the terminal end side second welded portion 270a includes a weld end mark 271 and a terminal end side melt slope portion. 273 is formed. The start end side second welded portion 270b is an example of the “third welded portion” in the claims.

  The start end side second welded portion 270b is provided with a start end side melt slope portion 272 in which the melting depth gradually increases from 0 to d21 in the direction approaching the first welded portion 260 (in the direction of arrow A2). Yes. In addition, the connecting portion 263a between the starting end side second welded portion 270b and the first welded portion 260 is formed so that the melting depth gradually increases from d21 to d22. A connecting portion 263b between the first welded portion 260 and the terminal-side second welded portion 270a is formed so that the melting depth gradually decreases from d22 to d21. The melting depth d21 is smaller than the axial thickness t1 of the end plate 40, and the melting depth d22 is larger than the axial thickness t1 of the end plate 40.

  After the start end side second welded portion 270b, the first welded portion 260, and the end end side second welded portion 270a are melted by irradiation with the high energy beam of the welding heat source 110 (see FIG. 8) in this order. Formed by solidification. The melting depths d21 and d22 are adjusted by changing the output of the high energy beam, as in the manufacturing method according to the first embodiment. In addition, the other structure and manufacturing method of 2nd Embodiment are the same as that of the said 1st Embodiment.

[Third Embodiment]
Next, as shown in FIG. 10, a rotor 300 according to a third embodiment will be described. In the rotor 300 according to the third embodiment, unlike the rotor 100 according to the first embodiment in which the melted trace portion is formed at a position overlapping the oil passage recess, the second welded portion 370 includes the end plate protrusion 341 and the core protrusion. Part 315 is formed. Moreover, in the following description, about the structure similar to 1st and 2nd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 10, the rotor 300 according to the third embodiment is continuous to the first welded portion 360 where the rotor core 310, the hub member 320, and the end plate 340 are welded, and one circumferential direction of the first welded portion 360. And a second welded portion 370 formed as described above. The hub member 320 is an example of the “rotation transmission member” in the claims.

  Here, in the third embodiment, the hub member 320 is recessed inward in the radial direction of the rotor core 310 with respect to the outer surface 322a, and the hub recess 322c (key groove) that engages with the core protrusion 315 and the end plate 340 of the rotor core 310. )including. The rotor core 310 is provided with a core convex portion 315 that engages with the hub concave portion 322c and projects radially inward from the inner side surface 310d. The end plate 340 is provided with an end plate convex portion 341 that engages with the hub concave portion 322c and projects radially inward from the inner side surface 340a. The hub recess 322c is an example of the “rotation transmitting member-side recess” in the claims. Moreover, the core convex part 315 and the end plate convex part 341 are examples of the “core side convex part” in the claims.

  The second welded portion 370 is formed at a position overlapping the core convex portion 315 and the end plate 340 when viewed in the arrow Z2 direction, and at least the end plate 340 of the core convex portion 315 and the end plate 340 is formed. Is formed by melting. The melting end mark 371 is formed on the end plate 340. That is, the second welded portion 370 (melting end mark 371) is formed at a position other than the torque transmitting portion. In addition, the other structure and manufacturing method of 3rd Embodiment are the same as that of the said 1st Embodiment.

[Fourth Embodiment]
Next, as shown in FIG. 11, a rotor 400 according to the fourth embodiment will be described. In the rotor 400 according to the fourth embodiment, unlike the rotor 100 according to the first embodiment in which the melted trace portion is formed at a position overlapping the oil passage recess, the second welded portion 470 is formed on the hub convex portion 422c. Yes. Moreover, in the following description, about the structure similar to 1st-3rd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.

  As shown in FIG. 11, the rotor 400 according to the fourth embodiment is continuous to the first welded portion 460 where the rotor core 410, the hub member 420, and the end plate 440 are welded, and one circumferential direction of the first welded portion 460. And a second welded portion 470 formed as described above. The hub member 420 is an example of the “rotation transmission member” in the claims.

  Here, in the fourth embodiment, the hub member 420 protrudes outward in the radial direction of the rotor core 310 from the outer surface 422a, and the core recess 415 (key groove) of the rotor core 410 and the end plate recess 441 of the end plate 440 ( A hub protrusion 422c that engages with the keyway). The rotor core 410 is provided with a core concave portion 415 that engages with the hub convex portion 422c and is recessed radially outward from the inner side surface 410d. The end plate 440 is provided with an end plate recess 441 that engages with the hub protrusion 422c and is recessed radially outward from the inner side surface 440a. The hub protrusion 422c is an example of the “rotation transmission member side protrusion” in the claims. The core recess 415 and the end plate recess 441 are examples of the “core recess” in the claims.

  Then, as viewed in the direction of the arrow Z2, the second welded portion 470 is formed at a position overlapping the hub convex portion 422c, and the hub member 420 is melted. The melting end mark 471 is formed on the hub member 420. That is, the second welded portion 470 (melting end mark 471) is formed at a position other than the torque transmitting portion. In addition, the other structure and manufacturing method of 4th Embodiment are the same as that of the said 1st Embodiment.

[Effects of the structure of the first to fourth embodiments]
With the structure of the first to fourth embodiments, the following effects can be obtained.

  In the first to fourth embodiments, as described above, the melting end marks (71, 271, 371, 471) are transferred between the rotation transmission member (20, 320, 420) and the rotor core (10, 310, 410). Formed in at least one of the rotation transmission member (20, 320, 420), the rotor core (10, 310, 410), and the end plate (40, 340, 440) at a position different from the position to be joined. To do. Thereby, the rotation transmission member (20, 320, 420) and the rotor core (10, 310, 410) in which the rotation force is transmitted between the rotation transmission member (20, 320, 420) and the rotor core (10, 310, 410). The end of melting (71, 271, 371, 471) (crater) is not formed at the portion where the end plate (40, 340, 440) is joined (the first welded portion (60, 260, 360, 460)). . As a result, it is possible to prevent stress concentration in the first welded portion (60, 260, 360, 460) resulting from the provision of the melting end trace (71, 271, 371, 471). It is possible to prevent the rotational force that can be transmitted by (60, 260, 360, 460) from decreasing.

  In the first to fourth embodiments, the rotation transmitting member (20, 320, 420), the rotor core (10, 310, 410), and the end plate (40, 340, 440) are welded. One weld (60, 260, 360, 460) is provided on the rotor (100, 200, 300, 400). Accordingly, the welded portion between the rotation transmission member (20, 320, 420) and the rotor core (10, 310, 410) and the welded portion between the rotor core (10, 310, 410) and the end plate (40, 340, 440). And the rotation transmission member (20, 320, 420) and the welded portion of the end plate (40, 340, 440) do not need to be formed separately, so that the manufacturing process of the rotor (100, 200, 300, 400) The number can be reduced.

  In the first to fourth embodiments, the second welded portion (70, 270a, 370, 470) has a melting depth toward the direction away from the first welded portion (60, 260, 360, 460). A melting slope portion (73, 273) is provided in which the length gradually decreases. Here, in order to prevent cracking (cracking) of the crater (melting end mark (71, 271, 371, 471)) and blowing up of the molten metal (sputtering) generated when the melting is finished, the welding heat source (110) It is conceivable to gradually reduce the heat input due to slag toward the end of the weld. However, when the heat input by the welding heat source (110) is gradually reduced, the melting depth cannot exceed the desired depth (specified size) in the vicinity of the end of the welded portion, and the bonding strength is sufficient. It is considered that there are cases where it cannot be secured. Therefore, even when the heat input by the welding heat source (110) is gradually reduced, it is conceivable to increase the melting depth of the entire welded portion in order to ensure the bonding strength. In this case, welding distortion increases due to the relatively large melting depth. Therefore, generally, there is a problem that it is difficult to prevent an increase in welding distortion while preventing the molten metal from being blown up. On the other hand, if the melting slope part (73, 273) is provided in the second welding part (70, 270a, 370, 470) as in the above embodiment, the first welding part (60, 260, 360, 460), the melting slope portions (73, 273) are not formed. Thereby, in a state where the melting depth (d3, d22) in the first welded portion (60, 260, 360, 460) is substantially maintained, the second welded portion (70, 270a, 370, 470) is formed. Heat is input by the welding heat source (110) to the vicinity (63, 263a, 263b), and then the melting slope portion (by gradually decreasing the heat input at the second welded portion (70, 270a, 370, 470)) 73, 273) can be formed. As a result, the melting depth (60, 260, 360, 460) at the first welding portion (60, 260, 360, 460) is increased without increasing the melting depth (d3, d22) of the entire first welding portion (60, 260, 360, 460). Since d3 and d22) can be prevented from falling below a desired depth, an increase in welding distortion can be prevented. Thereby, it is possible to prevent welding distortion from increasing while preventing the molten metal from being blown up.

  Moreover, in the said 2nd Embodiment, it is further provided with the 3rd welding part (270b) formed by being continuously formed in the circumferential direction one side of the 1st welding part (260), and fuse | melting, 2nd welding The portion (270a) is continuously formed on the other circumferential side of the first welded portion (260), and the third welded portion (270b) is directed toward the direction approaching the first welded portion (260). A starting end side melting slope portion (272) in which the melting depth gradually increases is provided. If comprised in this way, also in the part in which the 3rd welding part (270b) is formed (part on the start end side of the part to melt), welding distortion increases while effectively preventing the molten metal from blowing up. Can be prevented.

  In the first and second embodiments, the rotor core (10) is formed on the side surface (10d) on the side of the through hole (10a) along the rotation axis direction, and is recessed outward in the radial direction of the rotor core (10). The melting end mark (71, 271) including the groove (14) is provided at a position overlapping the groove (14) when viewed in the rotation axis direction. If comprised in this way, even if it is heat-input by a welding heat source (110) in a groove part (14), since a rotor core (10) and a rotation transmission member (20) are not joined, At least one of the rotation transmission member (20), the rotor core (10), and the end plate (40) at a position different from the position where the rotation transmission member (20) and the rotor core (10) are joined. The melting end mark (71, 271) can be formed.

  Moreover, in the said 1st and 2nd embodiment, a rotor core (10) is formed along the rotating shaft direction adjacent to the circumferential direction of a groove part (14), and several electromagnetic steel plates (11) are welded and formed. The melt end mark (71, 271) is provided at a position overlapping the groove (14) without overlapping the core weld (50) when viewed in the rotational axis direction. It has been. Here, in order to prevent influence on the rotor core (10) due to heat and deformation when forming the core welded portion (50), the groove portion (14) is adjacent to the circumferential direction of the core welded portion (50). It is conceivable to provide it. Focusing on this point, as in the first and second embodiments, the melting end mark (71, 271) is seen in the groove (14) adjacent to the core weld (50) as seen in the direction of the rotation axis. If it is formed at the overlapping position, the groove (14), the groove for preventing the influence on the rotor core (10) due to the core welded part (50), and the melting end mark (71, 271) (crater) Can also serve as both the groove portion for avoiding the formation of the first welded portion (60, 270). Thereby, the groove part for preventing the influence on the rotor core (10) resulting from the core weld part (50) and the fusion end mark (71, 271) are formed in the first weld part (60, 270). Since it is not necessary to separately form the groove portion for avoiding the above, the configuration of the rotor (100, 200) can be prevented from becoming complicated, and the number of manufacturing steps of the rotor (100, 200) can be reduced. It is possible to prevent the increase. Further, as in the first and second embodiments, when the melting end mark (71, 271) is provided at a position that does not overlap with the core welded portion (50) when viewed in the rotation axis direction, the core welded portion is provided. It is possible to more reliably avoid formation of melting end marks (71, 271) in the portion where the rotor core (10) having (50) and the hub member (20) are welded.

  Moreover, in the said 1st and 2nd embodiment, the groove part (14) provided in the position which overlaps with a fusion | melting completion trace (71,271) is formed as a channel | path which flows the cooling fluid. If comprised in this way, since the groove part (14) used as a channel | path which flows the cooling fluid can also serve as the groove part (14) for forming a fusion | melting completion trace (71,271), rotor (100, 200), the melting end mark (71, 271) can be easily formed while preventing the configuration from becoming complicated.

  In the fourth embodiment, the rotation transmission member (420) protrudes radially outward of the rotor core (410) and engages with the rotor core (410) and the end plate (440). (422c), and the rotor core (410) and the end plate (440) are provided with core side recesses (415, 441) that engage with the rotation transmission member side protrusions (422c), respectively, and melting ends. The mark (471) is provided on the rotation transmitting member side convex portion (422c). If comprised in this way, since the rotation transmission member side convex part (422c) is a position different from the position where a rotation transmission member (420) and a rotor core (410) are joined, a rotation transmission member side convex part ( By forming the melting end mark (471) in 422c), the melting end mark (471) can be easily formed at a position different from the position where the rotation transmitting member (420) and the rotor core (410) are joined. Can do.

  In the third embodiment, the rotation transmission member (320) is recessed inward in the radial direction of the rotor core (310), and engages with the rotor core (310) and the end plate (340) (322c). ), And the rotor core (310) and the end plate (340) are respectively provided with core-side convex portions (315, 341) that engage with the rotation transmission member-side concave portion (322c). 371) is provided on the core-side convex portions (315, 341). If comprised in this way, since a core side convex part (315,341) is a position different from the position where a rotation transmission member (320) and a rotor core (310) are joined, a core side convex part (315, 341) is easily formed with a melting end mark (371) at a position different from the position where the rotation transmitting member (320) and the rotor core (310) are joined. Can do.

  In the first to fourth embodiments, the melt depth (d2, d21) of the second welded portion (70, 270a, 370, 470) in the rotational axis direction is the first welded portion (60, 260, 360, 460) smaller than the melting depth (d3, d22). If comprised in this way, even when the thickness of the member which has a part in which the 2nd welding part (70, 270a, 370, 470) is formed is comparatively small, the 2nd welding part (70, 270a, 370, 470). Can be prevented from exceeding the thickness of the member. For example, when the second welded portions (70, 270a, 370, 470) are formed at positions overlapping the groove portions (14) of the rotor core (10, 310, 410) of the first embodiment, the end plate (40 340, 440) can be prevented from exceeding the melting depth of the second welded portion (70, 270a, 370, 470).

[Effects of the manufacturing methods of the first to fourth embodiments]
In the manufacturing methods of the first to fourth embodiments, the following effects can be obtained.

  In the said 1st-4th embodiment, a 1st welding part is obtained by welding a rotation transmission member (20,320,420), a rotor core (10,310,410), and an end plate (40,340,440). (60, 260, 360, 460) and the step of forming the first welded portion (60, 260, 360, 460) are continuously performed, and the first welded portion (60, 260, 360) is formed. 460) in the circumferential direction of the rotor core (10, 310, 410), the rotation transmission member (20, 320, 420), the rotor core (10, 310, 410), and the end plate (40, 340, 440) At least one of them is melted, and heat input to the melted portion is completed, whereby the rotation transmission member (20, 320, 420) and the rotor core (10, 310, 410) And at least one of the rotation transmission member (20, 320, 420), the rotor core (10, 310, 410), and the end plate (40, 340, 440). Forming a second welded portion (70, 270a, 370, 470) including melting end marks (71, 271, 371, 471) that are recessed in the direction of the rotation axis. Accordingly, the rotational force that can be transmitted by the first welded portion (60, 260, 360, 460) while ensuring the bonding strength between the rotor core (10, 310, 410) and the rotation transmitting member (20, 320, 420). It is possible to provide a method for manufacturing a rotor (100, 200, 300, 400) capable of preventing the decrease in the height.

  Moreover, in the said 1st-4th embodiment, the process of forming a 2nd weld part (70, 270a, 370, 470) is toward the direction away from a 1st weld part (60, 260, 360, 460). By gradually decreasing the heat input from the welding heat source (110), the second welded portion (70, 270a, 370, 470) is moved away from the first welded portion (60, 260, 360, 460). The melting slope portion (73, 273) in which the melting depth gradually decreases. If comprised in this way, the 2nd welding part (70, 270a, 370, 470) is the state which maintained substantially the melting depth (d3, d22) in a 1st welding part (60, 260, 360, 460). The melt slope portion (73, 273) can be formed by performing heat input with the welding heat source (110) up to the portion to be formed and then gradually decreasing the heat input. As a result, the melting depth (60, 260, 360, 460) at the first welding portion (60, 260, 360, 460) is increased without increasing the melting depth (d3, d22) of the entire first welding portion (60, 260, 360, 460). Since d3 and d22) can be prevented from falling below a desired depth, an increase in welding distortion can be prevented. Thereby, it is possible to prevent welding distortion from increasing while preventing the molten metal from being blown up.

[Modification]
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and further includes all modifications (modifications) within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above embodiment, an example in which the rotor is configured as an inner rotor has been described, but the present invention is not limited to this. For example, the rotor may be configured as an outer rotor.

  Moreover, although the said 1st and 2nd embodiment showed the example which forms in a rotation-axis direction the position where a fusion completion trace overlaps with an oil-path recessed part, this invention is not limited to this. For example, when viewed in the direction of the rotation axis, the melting end mark may be formed at a position overlapping with a dedicated groove that is not an oil passage.

  Further, in the first and second embodiments, the example in which the melting end trace is formed at a position overlapping the oil passage recess relatively far from the first welded portion when viewed in the rotation axis direction is shown. Is not limited to this. For example, the fusion end mark may be formed at a position that overlaps the oil passage recess relatively close to the welded portion, or may be formed at a position that overlaps the core welded portion if not joined to the core welded portion. Good.

  Moreover, in the said 1st-4th embodiment, the 2nd welding part was formed in the internal diameter side of the position where the permanent magnet is arrange | positioned, and the example which forms a 1st welding part in the internal diameter side between magnetic poles was shown. However, the present invention is not limited to this. That is, the 1st welding part may be formed in the inner diameter side of the position where the permanent magnet is arrange | positioned, and the 2nd welding part may be formed in the inner diameter side between magnetic poles.

  Moreover, in the said 1st-4th embodiment, although the melt depth of the 2nd weld part was formed smaller than the melt depth of the 1st weld part, this invention is not limited to this. That is, as in the third and fourth embodiments, when there is no possibility that the keyhole penetrates, the melting depth of the second welded portion is formed to be equal to or greater than the melt depth of the first welded portion. May be.

10, 310, 410 Rotor core 10a Through hole 10b, 10c End (end of rotor core in the rotation axis direction)
11 Electrical steel sheet 11a Side surface (side surface on the through hole side)
14 Oil channel recess (groove) 15, 315 Core convex (core convex)
20, 320, 420 Hub member (rotation transmission member)
22b, 322c Hub recess (rotation transmission member side recess)
30 Permanent magnet 40, 340, 440 End plate 41, 341 End plate convex part (core side convex part)
50 Core welded portion 60, 260, 360, 460 First welded portion 62, 262 Start end side melting slope portion 70, 270, 370, 470 Second welded portion 71, 271, 371, 471 Melting end mark 73, 273 End side melting Slope part 100, 200, 300, 400 Rotor 110 Welding heat source 270a End side second welded part (second welded part)
270b Start end side second welded portion (third welded portion)
415 Core concave portion (core side concave portion) 422c Hub convex portion (rotation transmission member side convex portion)
441 End plate recess (core recess)

Claims (11)

A rotor core that is rotated about a rotation axis and is laminated in a rotation axis direction that is a direction in which the rotation axis extends, and having a through hole at the rotation center,
A rotation transmitting member provided in the through hole of the rotor core;
An end plate provided at an end of the rotor core in the rotation axis direction;
A first weld that is a portion where the rotation transmission member, the rotor core, and the end plate are welded;
A second weld formed by being continuously melted in the first weld,
The second weld includes a fusion end mark formed when heat input to the part to be melted is completed,
The melting end mark is at a position different from that of the first weld and at the rotation transmission member, the end plate, or the position at which the rotation transmission member and the end plate are joined. The rotor that is formed.   2. The rotor according to claim 1, wherein the second welded portion is provided with a terminal side melting slope portion in which a melting depth gradually decreases in a direction away from the first welded portion. A third weld formed continuously by being formed on one circumferential side of the first weld and melted;
The second welded portion is formed continuously on the other circumferential side of the first welded portion,
3. The rotor according to claim 2, wherein the third welded portion is provided with a starting end side melting slope portion in which a melting depth gradually increases in a direction approaching the first welded portion. The rotor core is formed on a side surface on the through-hole side along the rotation axis direction, and includes a groove portion that is recessed outward in the radial direction of the rotor core,
The rotor according to any one of claims 1 to 3, wherein the melting end mark is provided at a position overlapping the groove when viewed in the rotation axis direction. The rotor core is formed along the rotation axis direction adjacent to the circumferential direction of the groove portion, and includes a core weld portion formed by welding the plurality of electromagnetic steel sheets,
The rotor according to claim 4, wherein the melting end mark is provided at a position overlapping with the groove portion without overlapping with the core welded portion when viewed in the rotation axis direction.   The rotor according to claim 4 or 5, wherein the groove portion provided at a position overlapping with the melting end mark is formed as a passage through which a cooling fluid flows. The rotation transmission member protrudes radially outward of the rotor core, and includes a rotation transmission member side convex portion that engages with the rotor core and the end plate,
Each of the rotor core and the end plate is provided with a core-side concave portion that engages with the rotation transmission member-side convex portion,
The rotor according to any one of claims 1 to 3, wherein the melting end mark is provided on the rotation transmission member side convex portion. The rotation transmission member is recessed inward in the radial direction of the rotor core, and includes a rotation transmission member side recess that engages with the rotor core and the end plate,
Each of the rotor core and the end plate is provided with a core-side convex portion that engages with the rotation transmission member-side concave portion,
The rotor according to any one of claims 1 to 3, wherein the melting end mark is provided on the core-side convex portion.   The rotor according to any one of claims 1 to 8, wherein a melting depth of the second welded portion is smaller than a melt depth of the first welded portion in the rotation axis direction. A rotor core that is rotated around a rotation axis and is laminated in a rotation axis direction that is a direction in which the rotation axis extends, and that has a through hole at the rotation center, and a rotation provided in the through hole of the rotor core A rotor manufacturing method comprising: a transmission member; and an end plate provided at an end of the rotor core in the rotation axis direction,
Forming a first weld by welding the rotation transmitting member, the rotor core, and the end plate;
It is performed continuously after the step of forming the first welded portion, and continuously melts at least one of the rotation transmission member, the rotor core, and the end plate from the first welded portion to the rotor core. A step of forming a second welded portion,
The step of forming the second welded portion is a position different from the first welded portion, and a position where the rotation transmission member, the end plate, or the rotation transmission member and the end plate are joined. A method of manufacturing a rotor, which is a step of forming a melting end mark by ending heat input to a melted portion.   The step of forming the second welded portion moves away from the first welded portion toward the second welded portion by gradually decreasing the heat input by the welding heat source in a direction away from the first welded portion. The method for manufacturing a rotor according to claim 10, which is a step of forming a melt slope portion in which a melt depth gradually decreases in a direction.

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