JP2016005307A - Rotary electric machine rotor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure fixing force in an axial direction of an end plate to a rotor shaft.SOLUTION: A rotary electric machine rotor 1 comprises: a rotor shaft 2; an annular rotor core 3 provided on the outer periphery of the rotor shaft 2; and an annular end plate 4 disposed on at least one side of an axial direction X of the rotor core 3 on the outer periphery of the rotor shaft 2. On the rotor shaft 2, a pair of core holding portions 51, 52 that holds and fixes the rotor core 3 in the axial direction X is respectively provided on both sides of the rotor core 3 in the axial direction X. The rotor shaft 2 and the end plate 4 are screwed to each other. A rotation stopper for fixing the end plate 4 to the rotor shaft 2 in a circumference direction is formed between the rotor shaft 2 and the end plate 4.

Description

  The present invention relates to a rotor for a rotating electrical machine having a rotor shaft and a rotor core provided on the outer periphery of the rotor shaft.

For example, in rotating electric machines such as motors, generators, and motor generators used in hybrid vehicles, electric vehicles, and the like, a rotor provided with a rotor core is rotatably arranged on the inner peripheral side of a stator provided with field windings. . An end plate is disposed at the end of the rotor core in order to prevent the permanent magnet contained in the rotor core from jumping out from the end of the rotor core. Furthermore, by using an end plate made of a nonmagnetic material such as an aluminum alloy or a magnesium alloy, loss due to magnetic flux leakage from the rotor core to the end plate is suppressed (Patent Document 1).
In the configuration of Patent Document 1, the end plate is fastened together with the rotor core by a caulking member, thereby being positioned in the axial direction and fixed to the rotor shaft.

JP 2013-59193 A

  However, aluminum alloys, magnesium alloys and the like are deformed over time due to a creep phenomenon when exposed to high stress. Accordingly, when the end plate and the rotor core are fastened together with a strong force to firmly fix the rotor core, the end plate made of an aluminum alloy or a magnesium alloy is deformed by a creep phenomenon. As a result, the axial fixing force of the end plate and the rotor core with respect to the rotor shaft is reduced.

On the other hand, if the end plate and the rotor core are individually press-fitted and fixed to the rotor shaft, the fixing force in the axial direction of the rotor core with respect to the rotor shaft is stabilized. However, since the rotor shaft is usually made of iron or the like and is made of a different material from the end plate, there is a large difference in linear expansion coefficient between the two. For this reason, when the end plate is press-fitted into the rotor shaft, the press-fit tightening margin is reduced due to a temperature change, and loosening occurs between the end plate and the rotor shaft. As a result, the fixing force of the end plate with respect to the rotor shaft is reduced, and there is a possibility that an axial backlash occurs in the end plate.
In addition, in order to obtain a desired fixing force by press-fitting the end plate into the rotor shaft, high molding accuracy is required for the parts involved in press-fitting such as the end plate and the rotor shaft, resulting in high cost.

  The present invention has been made in view of such a background, and an object of the present invention is to provide a rotor for a rotating electrical machine that can secure an axial fixing force of an end plate with respect to a rotor shaft.

One aspect of the present invention is a rotor shaft;
An annular rotor core provided on the outer periphery of the rotor shaft;
An annular end plate disposed on at least one of the axial directions of the rotor core on the outer periphery of the rotor shaft;
With
The rotor shaft is provided with a pair of core holding portions for holding and fixing the rotor core in the axial direction on both sides in the axial direction of the rotor core,
The rotor shaft and the end plate are screwed together,
Between the rotor shaft and the end plate, there is formed a rotation preventing portion for fixing the end plate in the circumferential direction with respect to the rotor shaft.

  In the rotor for a rotating electrical machine, the rotor shaft and the end plate are screwed together. Therefore, if the end plate does not rotate in the circumferential direction with respect to the rotor shaft, the end plate does not move in the axial direction with respect to the rotor shaft. Therefore, the anti-rotation portion is formed between the rotor shaft and the end plate. Since the end plate is fixed in the circumferential direction with respect to the rotor shaft by the rotation preventing portion, the end plate is also fixed in the axial direction with respect to the rotor shaft.

  As described above, the axial fixation of the end plate with respect to the rotor shaft can be realized by the screwed structure of the rotor shaft and the end plate and the anti-rotation structure. Therefore, it is possible to prevent the axial fixing force between the rotor shaft and the end plate from being reduced even if expansion and contraction due to temperature changes occur. In other words, even if the dimensions of the outer diameter of the rotor shaft and the inner diameter of the end plate slightly vary, it is possible to prevent the axial fixing force from varying. Therefore, it is possible to ensure the fixing force in the axial direction of the end plate with respect to the rotor shaft.

  Even if there are some errors in the outer diameter dimension of the rotor shaft and the inner diameter dimension of the end plate, the rotor for a rotating electrical machine has the above-described screwing structure and anti-rotation structure. It can prevent that the fixing force of a direction falls. Therefore, it is not necessary to increase the accuracy of the outer diameter of the rotor shaft and the inner diameter of the end plate, and the manufacturing cost can be reduced.

  As described above, according to the present invention, it is possible to provide a rotor for a rotating electrical machine capable of securing an axial fixing force of an end plate with respect to a rotor shaft.

Sectional drawing of the rotor for rotary electric machines in Example 1. FIG. The expanded sectional view of the rotor for rotary electric machines around an end plate in Example 1. FIG. FIG. 2 is an enlarged cross-sectional view of a rotor for a rotating electrical machine around a rotation stopper in the first embodiment. Sectional explanatory drawing of the rotor shaft, end plate, and rotation stopper part equivalent to the IV-IV line | wire arrow cross section of FIG. The VV arrow directional cross-sectional view of FIG. FIG. 3 is a perspective view of a rotor shaft in the first embodiment. FIG. 3 is a perspective view of an end plate according to the first embodiment. Sectional explanatory drawing of the assembly method of the end plate to a rotor shaft in Example 1. FIG. FIG. 3 is a perspective explanatory view immediately before mounting a key member on a rotation stopper in the first embodiment. The expanded sectional view of the rotor for rotary electric machines around an end plate in Example 2. FIG. FIG. 6 is an enlarged cross-sectional view of a rotor for a rotating electrical machine in the vicinity of a rotation stopper in the second embodiment. FIG. 6 is an enlarged cross-sectional view of a rotor shaft and an end plate before formation of a rotation stopper in Example 3. FIG. 9 is an enlarged cross-sectional view of a rotor shaft and an end plate around a rotation stopper in Embodiment 3.

The said end plate may be arrange | positioned only at the end of the axial direction in a rotor core, and may be arrange | positioned at both ends.
In the present specification, unless otherwise specified, the “axial direction” refers to the extending direction of the rotating shaft of the rotating electrical machine rotor, and the “radial direction” is orthogonal to the rotating shaft of the rotating electrical machine rotor. The direction of the straight line. The “circumferential direction” refers to a direction along the rotation direction of the rotation shaft of the rotor for a rotating electrical machine.

  Further, a shaft concave portion that is concave when viewed from the axial direction is formed on the outer peripheral surface of the rotor shaft, and a plate concave portion that is concave when viewed from the axial direction is formed on the inner peripheral surface of the end plate. The rotation stopper is preferably constituted by the shaft recess and the plate recess that are arranged to face each other in the radial direction, and a key member fitted to both the shaft recess and the plate recess. In this case, the rotation stopper can be easily and reliably formed.

  Further, one of the outer peripheral surface of the rotor shaft and the inner peripheral surface of the end plate and the other are a concave portion that is concave in the shape viewed from the axial direction, and a convex portion that is convex in the shape viewed from the axial direction. And the anti-rotation part may be formed by caulking the convex part to the concave part. In this case, the end plate can be screwed into the rotor shaft and disposed at a desired position, and then the convex portion can be caulked to the concave portion to form the rotation preventing portion. Therefore, it is easy to arrange the end plate at a desired axial position on the rotor shaft.

(Example 1)
An embodiment of the rotor for a rotating electrical machine will be described with reference to FIGS.
As shown in FIG. 1, the rotor 1 for a rotating electrical machine according to the present example is provided on a rotor shaft 2, an annular rotor core 3 provided on the outer periphery of the rotor shaft 2, and at least one of the outer periphery of the rotor shaft 2 in the axial direction of the rotor core 3. And an annular end plate 4 to be arranged.

The rotor shaft 2 is provided with a pair of core holding portions 51 and 52 for holding and fixing the rotor core 3 in the axial direction X on both sides of the rotor core 3 in the axial direction.
The rotor shaft 2 and the end plate 4 are screwed together.
Between the rotor shaft 2 and the end plate 4, as shown in FIG. 4, a detent portion 6 that fixes the end plate 4 in the circumferential direction Y with respect to the rotor shaft 2 is formed.

  As shown in FIGS. 4 and 6, a shaft recess 61 that is concave as viewed from the axial direction X is formed on the outer peripheral surface of the rotor shaft 2. As shown in FIGS. 4 and 7, a plate recess 62 that is concave as viewed from the axial direction X is formed on the inner peripheral surface of the end plate 4. As shown in FIGS. 3 and 4, the rotation preventing portion 6 includes a shaft concave portion 61 and a plate concave portion 62 which are arranged to face each other in the radial direction, and a key member 63 fitted in both the shaft concave portion 61 and the plate concave portion 62. It is configured.

  As shown in FIG. 1, the rotor shaft 2 includes an inner shaft 22 and an outer shaft 23 disposed on the outer peripheral side of the inner shaft 22. The outer shaft 23 includes a cylindrical tubular portion 231 for inserting the inner shaft 22, and a core attaching portion 232 that is disposed on the outer peripheral side of the tubular portion 231 and attaches the rotor core 3. The cylindrical part 231 and the core attaching part 232 are connected by a connecting part 233.

  Of the pair of core holding portions 51 and 52, one core holding portion 51 is formed integrally with the rotor shaft 2. That is, the core holding part 51 protrudes radially outward from the core attachment part 232 in the rotor shaft 2. The other core holding portion 52 is formed by fitting an annular member separate from the rotor shaft 2 to the outer peripheral surface of the rotor shaft 2. That is, the core holding part 52 is fitted and fixed to the core attaching part 232 by shrink fitting or the like at the end opposite to the core holding part 51 in the axial direction X. And the core 3 arrange | positioned on the outer periphery of the core attaching part 232 is clamped in the axial direction X between a pair of core holding | maintenance parts 51 and 52. As shown in FIG.

In the following, one end side (left side in FIG. 1) in the axial direction X on the side where the core holding portion 51 is disposed with respect to the rotor core 3 will be referred to as the first end side X1, and the opposite side (in FIG. 1). The right side) is referred to as a second end side X2.
The rotor shaft 2 (the inner shaft 22 and the outer shaft 23) and the core holding portion 52 are preferably made of the same kind of metal, for example, iron. On the other hand, the end plate 4 is made of a nonmagnetic metal such as aluminum or magnesium in order to prevent magnetic flux leakage from the rotor core 3.

As shown in FIGS. 2 and 6, a male screw portion 21 for being screwed with the end plate 4 is formed on a part of the outer peripheral surface of the rotor shaft 2. Specifically, the male screw portion 21 is formed on the outer peripheral surface of the core holding portion 51 formed integrally with the rotor shaft 2. In particular, in the present example, the male screw portion 21 is formed up to the end edge in the axial direction X of the core attachment portion 232 of the rotor shaft 2, that is, the end edge on the first end portion side X1.
On the other hand, as shown in FIGS. 2 and 7, a female screw portion 41 that is screwed into the male screw portion 21 of the rotor shaft 2 is formed on the inner peripheral surface of the end plate 4. The male screw portion 21 and the female screw 41 are screwed together, and the end plate 4 is screwed to the rotor shaft 2.

  As shown in FIGS. 4 and 7, plate recesses 62 are formed at two locations in the circumferential direction Y on the inner peripheral surface of the end plate 4. Further, as shown in FIGS. 4 and 6, shaft concave portions 61 are formed at two locations in the circumferential direction Y on the outer peripheral surface of the rotor shaft 2 disposed to face the inner peripheral surface of the end plate 4. That is, the two plate recesses 62 are formed in a state where the two portions of the female screw portion 41 are cut out radially outward. Similarly, the two shaft recessed parts 61 are formed in the state which notched two places of the external thread part 21 toward radial inside.

  As shown in FIGS. 4 and 9, the shaft recess 61 and the plate recess 62 are opposed to each other in the radial direction. The key member 63 is fitted in one space formed by combining the shaft recess 61 and the plate recess 62. In this example, the space formed by the shaft concave portion 61 and the plate concave portion 62 facing each other has a substantially rectangular parallelepiped shape, and the key member 63 also has a rectangular parallelepiped shape.

  The shaft recess 61, the plate recess 62, and the key member 63 arranged as described above form a detent portion 6 that fixes the end plate 4 in the circumferential direction Y with respect to the rotor shaft 2. And the rotation prevention part 6 is formed in two places of the circumferential direction Y. As shown in FIG. The anti-rotation parts 6 formed at two locations in the circumferential direction Y are arranged at positions shifted from each other by 180 ° in the circumferential direction Y.

As shown in FIGS. 1 and 5, the rotor core 3 includes a plurality of permanent magnets 31.
The permanent magnet 31 is held in the rotor core 3 so as to penetrate in the axial direction X at a position close to the outer peripheral surface of the rotor core 3. The rotor core 3 is formed by laminating a plurality of annular electromagnetic steel plates 33 in the axial direction X.

  In assembling the end plate 4 to the rotor shaft 2, for example, as shown in FIG. 8, the female screw portion 41 is screwed into the male screw portion 21 from the first end side X1 (arrow A). That is, while rotating the end plate 4 in the circumferential direction Y with respect to the rotor shaft 2, the end plate 4 is gradually moved to a desired position on the rotor shaft 2 toward the second end side X 2 in the axial direction X. As a result, the end plate 4 is disposed opposite to the rotor core 3 in the axial direction X (FIG. 1).

  However, at this time, the circumferential position is adjusted so that the plate recess 62 of the end plate 4 is disposed to face the shaft recess 61 of the rotor shaft 2 in the radial direction. Thereby, between the rotor shaft 2 and the end plate 4, the space which consists of the shaft recessed part 61 and the plate recessed part 62 is formed in two places. In this space, as shown in FIG. 9, the key member 63 is inserted from the axial direction X (arrow B). Here, the key member 63 contacts the pair of side wall surfaces 611 of the shaft recess 61 and the pair of side wall surfaces 621 of the plate recess 62.

As a result, as shown in FIG. 4, two anti-rotation portions 6 are formed between the rotor shaft 2 and the end plate 4, and the rotor shaft 2 and the end plate 4 are fixed in the circumferential direction Y. Accordingly, the end plate 4 screwed to the rotor shaft 2 is fixed in the axial direction X with respect to the rotor shaft 2.
In this example, the end plate 4 may be attached to the rotor shaft 2 before or after the rotor core 3 is attached to the rotor shaft 2.

  The rotating electrical machine rotor 1 is rotatably arranged on the inner peripheral side of a stator (not shown) and constitutes the rotating electrical machine. This rotating electrical machine can be used as, for example, a motor, a generator, or a motor generator used in a hybrid vehicle, an electric vehicle, or the like.

Next, the function and effect of this example will be described.
In the rotary electric machine rotor 1, the rotor shaft 2 and the end plate 4 are screwed together. Therefore, unless the end plate 4 rotates in the circumferential direction Y with respect to the rotor shaft 2, the end plate 4 does not move in the axial direction X with respect to the rotor shaft 2. Therefore, the anti-rotation portion 6 is formed between the rotor shaft 2 and the end plate 4. Since the end plate 4 is fixed in the circumferential direction Y with respect to the rotor shaft 2 by the rotation preventing portion 6, the end plate 4 is also fixed in the axial direction X with respect to the rotor shaft 2.

  Further, when a force in the axial direction X acts on the end plate 4 screwed to the rotor shaft 2, the force is generated in the direction in which the screw of the screw structure (the male screw portion 21 and the female screw portion 41) forms a spiral ( (Hereinafter referred to as “screw direction”) and a direction perpendicular thereto. Here, if the detent 6 is not provided, the end plate 4 does not move due to the component force in the direction orthogonal to the screw direction, but the end plate 4 may rotate due to the component force in the screw direction. . Therefore, by providing the anti-rotation portion 6, it is possible to prevent the end plate 4 from moving even if a force in the axial direction X acts on the end plate 4. Moreover, since the force which the rotation stopper part 6 receives at this time is a component force in the screw direction, it can be a relatively small force. Therefore, a large force does not act on the rotation stopper 6 and it is easy to ensure durability.

  Even if the anti-rotation portion 6 is provided, a slight clearance is formed in the circumferential direction Y, and the displacement in the circumferential direction Y of the end plate 4 with respect to the rotor shaft 2 may occur slightly. However, in this case, even if the end plate 4 is slightly displaced in the circumferential direction Y, if the lead angle of the screw is small, the displacement of the end plate 4 in the axial direction X can be extremely small. For example, if the lead angle is 5 °, it can be 1/10 of the displacement in the circumferential direction Y of the end plate 4. Therefore, it is easy to stabilize the fixing of the end plate 4 in the axial direction X by adopting the screwing structure and the rotation preventing structure of the rotor shaft 2 and the end plate 4 described above.

  From this point of view, the lead angle of the screw of the screwed structure of the rotor shaft 2 and the end plate 4 is preferably small, but is preferably less than 45 °, for example, and more preferably 5 ° or less. Note that the condition for the end plate 4 to rotate with respect to the rotor shaft 2 in response to the force in the axial direction X when there is no detent 6 is that the friction coefficient between the rotor shaft 2 and the end plate 4 and the screw Depending on the lead angle. From this viewpoint, the lead angle of the screw is preferably small, for example, 5 ° or less.

  Further, as described above, the fixing of the end plate 4 in the axial direction X to the rotor shaft 2 can be realized by the screwing structure and the rotation preventing structure of the rotor shaft 2 and the end plate 4. Therefore, even if expansion and contraction due to temperature change occur, it is possible to prevent a reduction in the fixing force in the axial direction X between the rotor shaft 2 and the end plate 4. That is, even if the dimensions of the outer diameter of the rotor shaft 2 and the inner diameter of the end plate 4 slightly vary, the fixing force in the axial direction X can be prevented from varying. Therefore, the fixing force in the axial direction X of the end plate 4 with respect to the rotor shaft 2 can be ensured.

  Even if there are some errors in the outer diameter of the rotor shaft 2 and the inner diameter of the end plate 4, the rotor 1 for a rotating electrical machine has the above-described screwing structure and anti-rotation structure. It can prevent that the fixing force of the axial direction X of the end plate 4 falls. Therefore, it is not necessary to particularly increase the accuracy of the outer diameter dimension of the rotor shaft 2 and the inner diameter dimension of the end plate 4, and the manufacturing cost can be reduced.

  The anti-rotation portion 6 includes a shaft concave portion 61 and a plate concave portion 62 that are arranged to face each other in the radial direction, and a key member 63 that is fitted into both the shaft concave portion 61 and the plate concave portion 62. Thereby, the rotation prevention part 6 can be formed easily and reliably.

  As described above, according to this example, it is possible to provide a rotor for a rotating electrical machine that can secure an axial fixing force of an end plate with respect to a rotor shaft.

(Example 2)
In this example, as shown in FIGS. 10 and 11, the flange 24 facing the surface of the end plate 4 opposite to the rotor core 3 is provided on the rotor shaft 2.
The flange portion 24 is formed to protrude radially outward from the outer periphery of the rotor shaft 2. Further, the flange portion 24 is formed at an end portion of the core attachment portion 232 on the first end portion side X1.

  As shown in FIG. 10, the male screw portion 21 in the rotor shaft 2 is formed between the flange portion 24 and the rotor core 3 in the axial direction X. In addition, as shown in FIG. 11, the shaft recess 61 is formed on the outer peripheral surface of the rotor shaft 2 between the flange 24 and the rotor core 3. That is, the shaft recessed part 61 is formed in the area | region of the axial direction X in which the external thread part 21 was formed. The key member 63 fitted over the shaft concave portion 61 and the plate concave portion 62 is disposed between the flange portion 24 and the rotor core 3.

  In addition, you may comprise so that a shaft recessed part may penetrate a collar part also in an axial direction. In this case, a notch portion is formed in the flange portion in the circumferential region where the shaft recess is formed.

  In the case of this example, the end plate 4 is attached to the rotor shaft 2 before the rotor core 3 is attached to the rotor shaft 2. That is, the end plate 4 is screwed into the male screw portion 21 of the rotor shaft 2 from the second end side X2 in the axial direction X. Then, the key member 63 is inserted into the space formed by the shaft concave portion 61 and the plate concave portion 62 from the second end portion side X2. Thereby, the rotation prevention part 6 is formed and the end plate 4 is fixed to the rotor shaft 2. Thereafter, the rotor core 3 is mounted on the rotor shaft 2.

  Others are the same as in the first embodiment. Of the reference numerals used in this example or the drawings relating to this example, the same reference numerals as those used in the first embodiment denote the same components as in the first embodiment unless otherwise specified.

  In the case of this example, for example, as shown in FIGS. 10 and 11, the end plate 4 can be fixed to the rotor shaft 2 in a state where the end plate 4 is in contact with the flange portion 24. In this case, when the end plate 4 is screwed onto the rotor shaft 2 and brought into contact with the flange 24, the circumferential position of the shaft recess 61 and the plate recess 62 needs to match.

Further, the end plate 4 does not necessarily need to be in contact with the flange 24. For example, when assembling the end plate 4 to the rotor shaft 2, the end plate 4 is once brought into contact with the flange portion 24, and then reversely rotated by less than 180 ° from the circumferential position of the plate recess 62 to the shaft recess 61. It is also possible to match. Thereby, the end plate 4 can be fixed to a desired position easily and accurately.
Thus, in the case of this example, the position of the end plate 4 in the axial direction X with respect to the rotor shaft 2 can be easily and accurately determined.
In addition, the same effects as those of the first embodiment are obtained.

(Example 3)
In this example, as shown in FIG. 13, a rotation preventing portion 6 for fixing the end plate 4 in the circumferential direction with respect to the rotor shaft 2 includes a concave portion 610 provided in the rotor shaft 2 and a convex portion 620 provided in the end plate 4. It is the example comprised by.
That is, the outer peripheral surface of the rotor shaft 2 and the inner peripheral surface of the end plate 4 have a concave portion 610 that is concave when viewed from the axial direction X, and a convex portion 620 that is convex when viewed from the axial direction X. Are formed. The anti-rotation portion 6 is formed by caulking the convex portion 620 to the concave portion 610.

  The recess 610 has a pair of side wall surfaces 611 that are substantially orthogonal to the circumferential direction Y in the shape viewed from the axial direction X. A pair of protrusions 620 protrude into the recess 610 so as to come into contact with the pair of side wall surfaces 611, respectively. An intermediate receding portion 622 that recedes outward in the radial direction is formed between the pair of convex portions 620.

  In assembling the end plate 4 to the rotor shaft 2, the end plate 4 in a state where the convex portion 620 is not formed is screwed to the rotor shaft 4 as shown in FIG. 12. Then, the end plate 4 is disposed at a desired position in the axial direction X of the rotor shaft 2. Thereafter, as shown in FIG. 13, a portion of the inner peripheral surface (internal thread portion 41) of the end plate 4 facing the concave portion 610 is deformed to form a convex portion 620, and the convex portion 620 is formed on a pair of sides of the concave portion 610. Caulking to the wall surface 611. That is, the intermediate receding portion 622 is formed by deforming a part of the inner peripheral surface of the end plate 4 so as to be pushed outward in the radial direction. Accordingly, a pair of convex portions 620 are formed on both sides of the intermediate receding portion 622. Thereby, the rotation prevention part 6 which consists of the convex part 620 and the recessed part 610 is formed.

  Others are the same as in the first embodiment. Of the reference numerals used in this example or the drawings relating to this example, the same reference numerals as those used in the first embodiment denote the same components as in the first embodiment unless otherwise specified.

In the case of this example, as described above, after the end plate 4 is screwed onto the rotor shaft 2 and disposed at a desired position, the convex portion 620 is caulked to the concave portion 610 to form a detent portion. 6 can be formed. Therefore, it is easy to arrange the end plate 4 at a desired axial position on the rotor shaft 2.
In addition, the same effects as those of the first embodiment are obtained.

In the said Example, although the example which has arrange | positioned the end plate 4 only to the end of the axial direction X in the rotor core 3 was shown, it is good also as a structure which has arrange | positioned the end plate to the both ends of a rotor core.
Moreover, in the said Example, although the example which provided the rotation prevention part 6 in two places of the circumferential direction Y was shown, the number of rotation prevention parts is not specifically limited, One piece may be sufficient and three pieces That's all. However, the rotation stoppers are preferably provided at a plurality of locations in the circumferential direction, and the plurality of rotation stoppers are preferably provided at equal intervals in the circumferential direction.

  In the above embodiment, the rotor shaft is configured by fitting the inner shaft and the outer shaft to each other. However, the present invention is not limited to this, and for example, the inner shaft and the outer shaft are integrated. It may be formed automatically. Alternatively, the rotor shaft may be constituted only by a cylindrical shaft such as the inner shaft shown in the above embodiment, and the rotor core may be directly attached to the rotor shaft.

DESCRIPTION OF SYMBOLS 1 Rotor for rotary electric machines 2 Rotor shaft 3 Rotor core 4 End plate 51, 52 Core holding part 6 Anti-rotation part X axial direction Y circumferential direction

Claims (3)

A rotor shaft;
An annular rotor core provided on the outer periphery of the rotor shaft;
An annular end plate disposed on at least one of the axial directions of the rotor core on the outer periphery of the rotor shaft;
With
The rotor shaft is provided with a pair of core holding portions for holding and fixing the rotor core in the axial direction on both sides in the axial direction of the rotor core,
The rotor shaft and the end plate are screwed together,
A rotor for a rotating electrical machine, wherein a rotation preventing portion that fixes the end plate in a circumferential direction with respect to the rotor shaft is formed between the rotor shaft and the end plate.   A shaft concave portion that is concave when viewed from the axial direction is formed on the outer peripheral surface of the rotor shaft, and a plate concave portion that is concave when viewed from the axial direction is formed on the inner peripheral surface of the end plate, The anti-rotation portion is configured by the shaft recess and the plate recess disposed opposite to each other in the radial direction, and a key member fitted to both the shaft recess and the plate recess. The rotor for a rotating electrical machine according to 1.   On one and the other of the outer peripheral surface of the rotor shaft and the inner peripheral surface of the end plate, there are a concave portion that is concave in the shape viewed from the axial direction and a convex portion that is convex in the shape viewed from the axial direction. 2. The rotor for a rotating electrical machine according to claim 1, wherein the rotation preventing portion is formed by caulking the convex portion to the concave portion.

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