JP2013128359A - Rotor and manufacturing method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor which is smaller in size, and reliably transfers torque from a rotor core to a shaft.SOLUTION: A rotor core 22 is sandwiched between a first flange 26 disposed at a first shaft 27 and a second flange 28 disposed at a second shaft 29, and a fastening member 31 penetrating through the rotor core 22 is fixed to two flanges 26 and 28. Therefore, a coupling part coupling with the shaft is not necessary on an inner peripheral surface 25 of the rotor core 22, so that thickness increase of the rotor core 22 can be suppressed to enable downsizing of a rotor 20A. And torque generated by rotation of the rotor core 22 is transmitted from the rotor core 22 through the fastening member 31 to the flanges 26 and 28 to rotate the shafts 27 and 29. The torque is reliably transmitted from the rotor core 22 to the shaft without providing the coupling part coupling with the shaft on the inner peripheral surface 25 of the rotor core 22.

Description

  The present invention relates to a rotor including a shaft and a rotor core.

  An electric motor and a generator are provided with a stator that is a stationary part and a rotor that is a rotating part. Among these, a rotor consists of a shaft and a rotor core supported by the shaft. When a magnetic field is generated in the stator and the rotor, the rotor rotates. At this time, the torque generated by the rotation of the rotor core is transmitted to the shaft, and the shaft rotates. Therefore, it is necessary that the torque is reliably transmitted from the rotor core to the shaft.

  In order to reliably transmit torque, various structures for attaching a rotor core to a shaft have been proposed (see, for example, Patent Document 1 (FIG. 1)).

Patent document 1 is demonstrated based on the following figure.
FIG. 16 is a diagram for explaining a basic configuration of a conventional technique, and a rotor 102 is disposed inside a stator 101 of an electric motor 100. The rotor 102 is formed by fitting an inner peripheral surface 105 of a rotor core 104 to a shaft 103.

  In addition, a concave portion 106 is provided on the outer peripheral surface of the shaft 103, and a convex portion 107 that engages with the concave portion 106 is provided on the inner peripheral surface of the rotor core 104. Next, the structure of the concave portion 106 and the convex portion 107 will be described.

FIG. 17 is a view for explaining the structure of a conventional coupling portion between the shaft and the rotor core.
FIG. 17A is an enlarged view of 17 a in FIG. 16, and the resin 108 is injected between the recess 106 and the protrusion 107. The torque generated by the rotation of the rotor core 104 is transmitted from the convex portion 107 to the concave portion 106 through the resin 108, whereby the shaft 103 rotates.

However, since the size of the convex portion 107 is small, when torque is transmitted from the rotor core 104 to the shaft 103, the convex portion 107 may be deformed and torque transmission may be deteriorated.
As a countermeasure, generally, as shown in (b), the groove 111 provided on the outer peripheral surface of the shaft 109 and the groove 113 provided on the inner peripheral surface of the rotor core 112 have a strength capable of withstanding a shear load or a compressive load generated during torque transmission. A key 114 is provided. Since the key 114 is a member that greatly cuts the inner peripheral surface of the rotor core 112, it is necessary to increase the thickness of the rotor core 112 by the amount of the cut. As a result, the outer radius R1 of the rotor core 112 is increased by the dimension L1 compared to (a), and the rotor 115 is enlarged. That is, it leads to the enlargement of an electric motor.

  It is advantageous that the electric motor has a smaller installation size. Therefore, there is a demand for a rotor that is smaller and that can reliably transmit torque from the rotor core to the shaft.

JP 2007-49787 A

  An object of the present invention is to provide a rotor technology that is smaller in size and that can reliably transmit torque from a rotor core to a shaft.

  The invention according to claim 1 is a rotor including a shaft and a rotor core attached to the shaft and laminated with a plurality of thin disc-like plates, the shaft being inserted from one end of the rotor core. 1 axis and a second axis inserted from the other end of the rotor core. The first axis is provided with a first flange portion that contacts one end surface of the rotor core, and the second axis is provided with the rotor core. A second collar part that contacts the other end surface is provided, the rotor core is sandwiched between the first collar part and the second collar part, a fastening member is passed through the rotor core, and one end of the fastening member is connected to the first collar part And the other end of the fastening member is fixed to the second flange part.

  In the invention which concerns on Claim 2, it fits in both the said 1st axis | shaft and the said 2nd axis | shaft rather than the sum total of the number of the thin sheet | seats which a 1st axis | shaft fits, and the number of the said thin board which a 2nd axis | shaft fits. The number of the thin plates not to be used is large.

  The invention according to claim 3 is characterized in that the number of thin plates not fitted to either the first shaft or the second shaft is set in a range of 70 to 90% of the total sum of the thin plates.

  The invention according to claim 4 is a rotor manufacturing method in which a shaft is attached to a rotor core in which a plurality of disk-like thin plates are laminated, and by laminating the plurality of disk-like thin plates, A stacking step of forming the rotor core, a shaft inserting step of inserting a first shaft from one end of the rotor core and a second shaft from the other end of the rotor core, a first flange portion of the first shaft, and the first The rotor core is sandwiched between two biaxial second collar parts, a fastening member is passed through the rotor core, one end of the fastening member is fixed to the first collar part, and the other end of the fastening member is attached to the second collar part. It comprises a fastening process for fixing.

In the invention which concerns on Claim 1, the 1st collar part contact | abutted to the one end surface of a rotor core was provided in the 1st axis | shaft, and the 2nd collar part contact | abutted to the other end surface of the rotor core was provided in the 2nd axis | shaft. The rotor core is sandwiched between the first collar part and the second collar part, the fastening member is passed through the rotor core, one end of the fastening member is fixed to the first collar part, and the other end of the fastening member is fixed to the second collar part. .
Since the rotor core is sandwiched between the first flange portion provided on the first shaft and the second flange portion provided on the second shaft, and the fastening member penetrating the rotor core is fixed to the two flange portions, the inner surface of the rotor core is fixed. It is not necessary to provide a coupling portion with the shaft, and an increase in the thickness of the rotor core can be suppressed. That is, the rotor can be downsized.

  Further, since the fastening member penetrating the rotor core is fixed to the two flange portions, torque generated by the rotation of the rotor core is transmitted from the rotor core to the two flange portions via the fastening member, and the first shaft and the second shaft are Rotate. Torque can be reliably transmitted from the rotor core to the shaft without providing a coupling portion with the shaft on the inner peripheral surface of the rotor core. Therefore, it is possible to provide a rotor that is smaller and can reliably transmit torque from the rotor core to the shaft.

In the invention which concerns on Claim 2, it is the sum of the number of the thin plate which a 1st axis | shaft fits, and the sum of the number of the thin plate which a 2nd axis | shaft fits. I increased the number of sheets.
Since the number of thin plates to which the two shafts are not fitted is larger than the number of thin plates to which the two shafts are fitted, the number of thin plates that are deformed when the shaft is fitted to the thin plates can be reduced. When the number of deformed thin plates is reduced, an increase in the thickness dimension of the laminated body can be suppressed when thin plates are laminated to form a laminated body, and the rotor core can be further miniaturized.

In the invention which concerns on Claim 3, the number of the thin plates which do not fit in any of the 1st axis | shaft and the 2nd axis | shaft is set to the range of 70 to 90% of the sum total of a thin plate.
Since the number of thin plates not fitted to the two shafts is set in a range of 70 to 90% of the total sum of the thin plates, most of the thin plates are not deformed when the shaft is fitted to the thin plates. By further reducing the number of deformed thin plates, when thin plates are laminated to form a laminated body, an increase in the thickness dimension of the laminated body is further suppressed, and the rotor core can be further reduced in size.

  In the invention according to claim 4, the method for manufacturing the rotor includes a laminating step of forming a rotor core by laminating a plurality of thin disc-shaped plates, a first shaft inserted from one end of the rotor core, and the other end of the rotor core. Inserting the second shaft from the shaft, sandwiching the rotor core between the first collar portion of the first shaft and the second collar portion of the second shaft, passing the fastening member through the rotor core, and connecting one end of the fastening member to the first shaft It consists of the fastening process which fixes to the 1 collar part and fixes the other end of a fastening member to a 2nd collar part.

In the fastening process, the rotor core is sandwiched between the first flange portion provided on the first shaft and the second flange portion provided on the second shaft, and the fastening member penetrating the rotor core is fixed to the two flange portions. It is not necessary to provide a coupling portion with the shaft on the inner peripheral surface, and an increase in the thickness of the rotor core can be suppressed. That is, the rotor can be downsized.
Moreover, since the fastening member penetrated by the rotor core was fixed to the two flanges in the fastening process, the torque generated by the rotation of the rotor core is transmitted from the rotor core to the two flanges via the fastening member, and the first shaft The second axis rotates. Torque can be reliably transmitted from the rotor core to the shaft without providing a coupling portion with the shaft on the inner peripheral surface of the rotor core. Therefore, it is possible to provide a method for manufacturing a rotor that is smaller and that can reliably transmit torque from the rotor core to the shaft.

It is sectional drawing of an electric motor provided with the rotor which concerns on this invention. FIG. 2 is an enlarged view of part 2 of FIG. 1. It is an exploded view of a rotor. FIG. 4 is a cross-sectional view taken along line 4-4 of FIG. It is a figure explaining a lamination process. It is a figure explaining a shaft insertion process and a fastening process. It is a comparison figure of an Example and a comparative example. It is a figure which shows the example of a change of FIG. It is a figure which shows the example of a change of FIG. It is a figure which shows the further example of a change of FIG. It is a figure explaining the effect | action of the fastening member of FIG. It is a figure which shows the further example of a change of FIG. It is a figure explaining the attachment method of the fastening member of FIG. It is a figure which shows the example of a change of FIG. It is a figure explaining the attachment method of the fastening member of FIG. It is a figure explaining the basic composition of the conventional technology. It is a figure explaining the structure of the connection part of the conventional shaft and rotor core.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

A rotor and a method for manufacturing the rotor according to the present invention will be described with reference to the drawings by taking an electric motor as an example. Further, the description will be given with the load connecting side of the shaft as the front and the non-load side of the shaft as the rear.
As shown in FIG. 1, the electric motor 10 includes a stator 11, a front bracket 13 provided at a front portion of the stator 11 and provided with a front bearing 12, and a rear side provided at a rear portion of the stator 11 and provided with a rear bearing 14. The bracket 15 and a rotor 20 </ b> A (described later in detail) which are rotatably supported by the front bearing 12 and the rear bearing 14 and are arranged inside the stator 11.

  The stator 11 includes a stator frame 51, a stator core 52 provided on the stator frame 51, and a stator winding 53 wound around the stator core 52.

The structure of the rotor 20A will be described with reference to FIG.
As shown in FIG. 2, the rotor 20 </ b> A includes a rotor core 22 in which 75 disk-shaped thin plates 21 are stacked, a front end plate 23 disposed so as to contact the front end of the rotor core 22, and a rear end of the rotor core 22. A rear end plate 24 disposed so as to contact the front end, and a first flange portion 26 supported by a front bearing (FIG. 1, reference numeral 12) and inserted into the inner peripheral surface 25 from the front end of the rotor core 22 and in contact with the front end plate 23. A first shaft 27 provided, and a second flange 28 supported by a rear bearing (FIG. 1, reference numeral 14) and inserted into the inner peripheral surface 25 from the rear end of the rotor core 22 and in contact with the rear end plate 24. The biaxial shaft 29 includes a rotor core 22, end plates 23 and 24, and flanges 26 and 28, and a plurality of pins 31 that are fitted to the flanges 26 and 28 and serving as fastening members. The shaft of the rotor 20 </ b> A is not a single shaft but includes a first shaft 27 and a second shaft 29. Although the number of thin plates 21 is 75 in the embodiment, this number is merely an example, and the number may be changed as appropriate.

  That is, the rotor 20 </ b> A sandwiches the rotor core 22 between the first flange portion 26, the front end plate 23, the second flange portion 28, and the rear end plate 24, and allows the pin 31 to pass through the rotor core 22. The rear end 33 of the pin 31 is fixed to the second flange portion 28. In the embodiment, the rotor 20A is provided with the front end plate 23 and the rear end plate 24. However, the front end plate 23 and the rear end plate 24 are eliminated, and the first flange portion 26 and the second flange portion 28 are directly connected. You may contact | abut to the rotor core 22. FIG.

Next, the fitting of the first shaft 27, the second shaft 29 and the thin plate 21 will be described.
The inner portion 34 of the first shaft 27 is fitted only to the four thin plates 21, and the inner portion 35 of the second shaft 29 is fitted only to the four thin plates 21. Therefore, the first shaft 27 and the first shaft 27 are larger than the sum (8) of the number of thin plates 21 to which the first shaft 27 is fitted (four) and the number of thin plates 21 to which the second shaft 29 is fitted (four). The number of thin plates (67 sheets) that do not fit into any of the two shafts 29 increases. The length L2 is a non-fitting length in which the shafts 27 and 29 are not fitted to the thin plate 21.

In addition, the number (67) of thin plates 21 that are not fitted to either the first shaft 27 or the second shaft 29 is set in a range of 70 to 90% of the total sum (75) of the thin plates 21.
In the embodiment, 67 sheets / 75 sheets × 100 = 89%, but the number of the thin plates 21 not fitted to the shafts 27 and 29 may be determined so as to be in the range of 70 to 90%. That is, the number of the thin plates 21 that are not fitted to the shafts 27 and 29 can be selected from the range of 53 to 68.

The assembly structure of the rotor 20A will be described with reference to FIG.
As shown in FIG. 3, the shaft fitting hole 36 of the front end plate 23 and the shaft fitting of the thin plate 21 are performed while the both sides of the rotor core 22 formed by laminating the thin plates 21 are sandwiched between the front end plate 23 and the rear end plate 24. The inner portion 34 of the first shaft 27 is fitted into the hole 37. Further, the inner portion 35 of the second shaft 29 is fitted into the shaft fitting hole 38 of the rear end plate 24 and the shaft fitting hole 37 of the thin plate 21.

  Next, the pin fixing hole 39 of the first flange part 26, the pin insertion hole 41 of the front end plate 23, the pin insertion hole 42 of the thin plate 21, the pin insertion hole 43 of the rear end plate 24, and the pin fixing hole of the second flange part 28 The pin 31 is inserted into 44. This completes the assembly of the rotor 20A. If the radius from the center line 45 to the inner peripheral surface of the rotor core 22 (FIG. 2, reference numeral 25) is R2, and the radius from the center line 45 to the center of the pin fixing holes 39, 44 is R3, then R3> R2.

The function of the pin 31 will be described with reference to FIG.
As shown in FIG. 4, when the rotor core 22 rotates as indicated by an arrow (1), the pin 31 penetrated through the rotor core 22 moves on the radius R3 as indicated by an arrow (2) around the point P3. By the movement of the pin 31, the second collar portion 28 fixed to the pin 31 rotates as indicated by an arrow (3). In the rotor 20 </ b> A, torque generated by the rotation of the rotor core 22 is transmitted to the second flange portion 28 via the pin 31. Since the 2nd axis | shaft 28 is connected with the 2nd axis | shaft (FIG. 2, code | symbol 29), a 2nd axis | shaft rotates.

A method for manufacturing the rotor 20A having the above configuration will be described below. First, the stacking process will be described with reference to FIGS.
As shown in FIG. 5A, a plurality of thin plates 21 are placed on the positioning jig 61 as indicated by an arrow (4).
As shown in (b), the rotor core 22 is formed. In the laminating step, the rotor core 22 is formed by laminating a plurality of disk-shaped thin plates 21. The left and right clamp mechanisms 62 are moved toward the left and right side surfaces of the rotor core 22 as indicated by arrows (5).

  As shown in (c), the rotor core 22 is held by the clamp mechanism 62 by lowering the pressing portion 63 of the clamp mechanism 62 as shown by the arrow (6). In this state, the positioning jig 61 is lowered as indicated by an arrow (7).

Next, the shaft insertion process will be described with reference to FIG. 6 (a), and the fastening process will be described with reference to (b) and (c).
As shown in FIG. 6A, in the shaft insertion step, the inner portion 34 of the first shaft 27 is inserted into the inner peripheral surface 25 from the front end 64 of the rotor core 22 as indicated by an arrow (8). Further, the inner portion 35 of the second shaft 29 is inserted from the rear end 65 of the rotor core 22 into the inner peripheral surface 25 as indicated by an arrow (9).

  As shown in (b), in the fastening process, the rotor core 22 is sandwiched between the first flange portion 26 of the first shaft 27 and the second flange portion 28 of the second shaft 29, and the holes 39, 42, 44 of the rotor core 22 are sandwiched. A plurality of pins 31 are penetrated as indicated by an arrow (10). As a result, the front end 32 of the pin 31 is fixed to the first flange part 26 and the rear end 33 of the pin 31 is fixed to the second flange part 28 as shown in FIG.

Next, a method for manufacturing the rotor will be described together.
As shown in FIG. 5 (b), the rotor manufacturing method includes a laminating process of forming a rotor core 22 by laminating a plurality of disk-shaped thin plates 21, and a rotor core as shown in FIG. 6 (a). The first shaft 27 is inserted from the front end 64 of the rotor 22, and the second shaft 29 is inserted from the rear end 65 of the rotor core 22, and as shown in FIG. The rotor core 22 is sandwiched between the portion 26 and the second flange portion 28 of the second shaft 29, the pin 31 is passed through the rotor core 22, the front end 32 of the pin 31 is fixed to the first flange portion 26, and the rear end of the pin 31 A fastening step of fixing 33 to the second flange portion 28.

Next, an example and a comparative example relating to the fitting between the shaft and the thin plate will be described with reference to FIG. A comparative example will be described in (a), and an example will be described in (b).
As shown in FIG. 7A, when the shaft 201 is press-fitted into the rotor core 200, all the edge edges 203 of the nineteen thin plates 202 are bent. There are 18 gaps Δt between the thin plate 202 and the thin plate 202. When the design thickness is L3 and the number of gaps is 18, the thickness of the rotor core 200 is represented by L3 + Δt × 18.

  On the other hand, as shown in (b), when the first shaft 27 and the second shaft 29 are press-fitted into the rotor core 22, the edges 66 of the holes of the eight thin plates 21 are bent, but the holes of the eleven thin plates 21 are bent. The edge 67 is not bent. There are eight gaps Δt between the thin plate 21 and the thin plate 21. When the design thickness is L4 and the number of gaps is 8, the thickness of the rotor core 22 is represented by L4 + Δt × 8. Compared with the comparative example (a), the embodiment reduces the number of bending of the edge of the thin plate hole, thereby suppressing an increase in the thickness of the rotor core 22 and enabling the rotor core 22 to be downsized.

  In the rotor 20 </ b> A described so far, the rotor core 22, the end plates 23 and 24, and the flange portions 26 and 28 are fixed with pins 31. The pin can only be inserted and the thickness of the rotor core cannot be adjusted after insertion. If the thickness of the rotor core can be adjusted after the rotor is assembled, a more preferable rotor can be provided. An example of this will be described next.

In FIG. 8, the same structure as that in FIG.
The main change is that the fastening member is changed from a pin to a bolt.
The rotor 20B is assembled by passing the bolt 71 through the rotor core 22, the end plates 23 and 24, and the flange portions 26 and 28, and screwing the male screw portion 72 of the bolt 71 into the female screw portion 73 provided in the flange portion 26.
Since the bolt 71 is used as the fastening member, the bolt 71 can be tightened after the rotor 20B is assembled, and the thickness of the rotor core 22 can be adjusted.

  In the rotor 20B, the female thread portion 73 is provided in the flange portion 26. However, the female thread machining needs to be performed in two ways: a pilot hole machining and a tap machining. If the number of machining operations can be reduced, the manufacturing time of the rotor can be shortened. An example of this will be described next.

In FIG. 9, the same structure as that of FIG.
The main change is that the fastening member is changed from a bolt only to a bolt and a nut.
The rotor 20 </ b> C is assembled by passing a bolt 71 through the rotor core 22, the end plates 23 and 24, and the flange portions 26 and 28, and fastening a male thread 72 of the bolt 71 with a nut 74.
Since the bolt 71 and the nut 74 are used as the fastening member, it is not necessary to perform female threading on the flange portion 26. Since only the hole 75 is formed in the collar portion 26, the number of times of machining can be reduced as compared with the case where female thread machining is performed, and the manufacturing time of the rotor can be shortened.

  In the rotor 20A, the pin 31 is applied to the fastening member. By the way, since the rotor is a rotating part, the rotor core, the end plate, and the flange portion need to be firmly coupled. Then, the example which can strengthen the coupling | bonding of a fastening member and a collar part is demonstrated below.

In FIG. 10, the same structure as that of FIG.
The main change is that the fastening member is changed from a pin to a pipe having an elastic member inserted into the hollow portion.
The rotor 20 </ b> D is assembled by passing a thin-walled pipe 77 through the rotor core 22, the end plates 23 and 24, and the flange portions 26 and 28, and fixing the pipe 77 to the flange portions 26 and 28. An elastic member 78 is inserted into the hollow portion of the pipe 77.

A method for attaching the pipe 77 will be described with reference to FIG.
As shown to Fig.11 (a), the pipe 77 is inserted in the pin fixing hole 39 of the 1st collar part 26 like the arrow (11).
As shown in (b), since the elastic member 78 is inserted into the pipe 77, when the pipe 77 is fitted into the tight pin fixing hole 39, the diameter of the pipe 77 is reduced and the elastic member is inserted. 78 generates a reaction force as indicated by an arrow (12). Due to this reaction force, the pipe 77 comes into close contact with the pin fixing hole 39, so that the coupling between the pipe 77 and the first flange 26 can be strengthened. The elastic member 78 can be any of soft resin, rubber, and soft metal.

  In the rotor 20A described above, the pin 31 is applied to the fastening member. If the pin coupling can be further strengthened, a more preferable rotor can be realized. An example of this will be described next.

In FIG. 12, the same structure as that of FIG.
The main change is that the process is such that only the pin as the fastening member is fitted, so that the end of the pin is crushed after the pin is fitted.
The rotor 20E is assembled by passing the pin 79 through the rotor core 22, the end plates 23 and 24, and the flange portions 26 and 28, crushing the front end 81 of the pin 79, and crushing the rear end 82 of the pin 79.

A crushing process applied to the front end 81 and the rear end 82 of the pin 79 will be described with reference to FIG.
As illustrated in FIG. 13A, the pin 79 is passed through the rotor core 22, the end plate 23, and the flange portions 26 and 28, and the rear end 82 of the pin 79 is applied to the receiving portion 83. In this state, the hammer 84 is moved as indicated by an arrow (13) to crush the front end 81 of the pin 79. The collar portion 26 is provided with a space 85 into which the crushed material enters.

  As shown in (b), the front end 81 of the pin 79 is crushed and the pin 79 is coupled to the flange 26. Not only is the pin fitted into the collar part, but the front end 81 of the pin 79 is crushed and the pin 79 is coupled to the collar part 26, so that the coupling between the pin and the collar part is further strengthened.

  In the rotor 20E, the front end 81 of the pin 79 is crushed to strengthen the connection between the pin and the collar. Next, an example in which an elastic member-containing pipe applied to the rotor 20D is added to this structure will be described.

In FIG. 14, the same reference numerals are used for the structure common to FIG. 12, and detailed description thereof is omitted.
The main change is that the pin is changed to a pipe with an elastic member.
The rotor 20F is assembled by passing the pipe 87 through the rotor core 22, the end plate 23, and the flange portion 26 and crushing the front end 88 of the pipe 87. An elastic member 89 is inserted into the hollow portion of the pipe 87.

The crushing process applied to the front end 88 and the rear end of the pipe 87 will be described with reference to FIG.
As shown in FIG. 15A, the pipe 87 is passed through the rotor core 22, the end plate 23, and the flange portions 26 and 28, and the rear end 91 of the pipe 87 is applied to the receiving portion 83. In this state, the hammer 84 is moved as shown by an arrow (14) to crush the front end 88 of the pipe 87.

  As shown in (b), the front end 88 of the pipe 87 is crushed and the pipe 87 is coupled to the flange portion 26. In addition, since the elastic member 89 generates a reaction force as indicated by an arrow (15), the pipe 77 is in close contact with the first flange portion 26. Therefore, the coupling between the pin and the buttock is further strengthened.

The effects of the rotor 20A and the method for manufacturing the rotor 20A described above will be described below.
With the structure shown in FIG. 2, the fastening member 31 sandwiched between the first collar portion 26 provided on the first shaft 27 and the second collar portion 28 provided on the second shaft 29 and penetrating the rotor core 22 is provided. Since it is fixed to the two flange portions 26 and 28, it is not necessary to provide a coupling portion with the shaft on the inner peripheral surface 25 of the rotor core 22, and an increase in the thickness of the rotor core 22 can be suppressed. That is, the rotor 20A can be downsized.

  Further, the fastening member 31 penetrating the rotor core 22 was fixed to the two flange portions 26 and 28. Therefore, as shown in FIG. 4, the torque generated by the rotation represented by the arrow (1) of the rotor core 22 is transmitted from the rotor core 22 to the flange portion 28 via the fastening member 31, and the shaft rotates. Torque can be reliably transmitted from the rotor core 22 to the shaft without providing a coupling portion with the shaft on the inner peripheral surface 25 of the rotor core 22. Therefore, it is possible to provide a rotor 20A that is smaller and can reliably transmit torque from the rotor core 22 to the shaft.

  With the configuration shown in FIG. 7B, the number of the thin plates 21 to which the two shafts 27 and 29 are not fitted is larger than the number of the thin plates 21 to which the two shafts 27 and 29 are fitted. The number of thin plates 21 that are deformed when 29 is fitted to the thin plate 21 can be reduced. When the number of deformed thin plates 21 decreases, when the thin plates 21 are stacked to form a laminate, an increase in the thickness dimension of the laminate can be suppressed, and the rotor core 22 can be further downsized. .

  2, the number of the thin plates 21 that do not fit to the two shafts 27 and 29 is set in a range of 70 to 90% of the total of the thin plates 21, so that the shafts 27 and 29 are fitted to the thin plate 21. When combined, most of the thin plate 21 is not deformed. Since the number of deformed thin plates 21 is further reduced, when the thin plates 21 are laminated to form a laminated body, an increase in the thickness dimension of the laminated body is further suppressed, and the rotor core 22 can be further reduced in size. Become.

  With the configuration shown in FIG. 2, both ends 32, 33 of the fastening member 31 are fixed to the two flange portions 26, 28 with the fastening member 31 penetrating the rotor core 22, so the rotor core 22 and the two shafts 27, 29 are fixed. Can be strengthened, and the rigidity of the rotor 20A can be improved.

  6B and 6C, in the fastening process, the rotor core 22 is provided with the first flange portion 26 provided on the first shaft 27 and the second flange portion 28 provided on the second shaft 29 in the fastening process. Since the fastening member 31 sandwiched between the two and fixed to the two flange portions 26 and 28 is fixed to the two flange portions 26 and 28, there is no need to provide a coupling portion with the shaft on the inner peripheral surface 25 of the rotor core 22, and the thickness of the rotor core 22 increases. Can be suppressed. That is, the rotor 20A can be downsized.

  Further, since the fastening member 31 penetrated through the rotor core 22 is fixed to the two flange portions 26 and 28 in the fastening process, the torque generated by the rotation of the rotor core 22 is generated from the rotor core 22 via the fastening member 31. 26 and 28, the first shaft 27 and the second shaft 29 rotate. Torque can be reliably transmitted from the rotor core 22 to the shaft without providing a coupling portion with the shaft on the inner peripheral surface 25 of the rotor core 22. Therefore, it is possible to provide a method for manufacturing the rotor 20A that is smaller and can reliably transmit torque from the rotor core 22 to the shaft.

  In addition, although the rotor of this invention was applied to the motor in embodiment, it is applicable also to a generator.

  The rotor and the rotor manufacturing method of the present invention are suitable for manufacturing a rotor of a motor or a generator and a rotor of a motor or a generator.

  20A ... rotor, 21 ... thin plate, 22 ... rotor core, 26 ... first flange, 27 ... first shaft, 28 ... second flange, 29 ... second shaft, 31 ... fastening member (pin), 32, 64 ... Front end, 33, 65 ... rear end.

Claims (4)

A rotor comprising a shaft and a rotor core attached to the shaft and laminated with a plurality of thin disc-like plates;
The shaft comprises a first axis inserted from one end of the rotor core and a second axis inserted from the other end of the rotor core,
The first shaft is provided with a first collar portion that abuts on one end surface of the rotor core, and the second shaft is provided with a second collar portion that abuts on the other end surface of the rotor core,
While sandwiching the rotor core between the first flange and the second flange,
A rotor characterized in that a fastening member is passed through the rotor core, one end of the fastening member is fixed to the first flange, and the other end of the fastening member is fixed to the second flange.   The number of the thin plates that do not fit in either the first shaft or the second shaft, than the sum of the number of the thin plates that the first shaft fits and the number of the thin plates that fit the second shaft. The rotor according to claim 1, wherein there are many.   3. The number of the thin plates that do not fit in either the first shaft or the second shaft is set in a range of 70 to 90% of the total sum of the thin plates. The described rotor. A rotor manufacturing method in which a shaft is attached to a rotor core in which a plurality of disk-shaped thin plates are laminated,
Laminating step of forming the rotor core by laminating the plurality of disk-shaped thin plates;
A shaft insertion step of inserting a first shaft from one end of the rotor core and inserting a second shaft from the other end of the rotor core;
The rotor core is sandwiched between the first flange portion of the first shaft and the second flange portion of the second shaft, a fastening member is passed through the rotor core, one end of the fastening member is fixed to the first flange portion, A rotor manufacturing method comprising: a fastening step of fixing the other end of the fastening member to the second flange portion.

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