JP2014054105A - Mounting structure of hollow member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an end plate from rotating relatively to a rotor.SOLUTION: A rotor core 22 and end plates 24 and 25 are mounted on a rotor shaft 30 by fitting the end plate 24 and the rotor core 22 to the rotor shaft 30 (placing them on the outer peripheral side), fitting the end plate 25 to the rotor shaft 30 so that a plurality of protrusions 37 at the mounting part 33 of the rotor shaft 30 are inserted into a plurality of holes 26, and then caulking the plurality of protrusions 37 at the mounting part 33 of the rotor shaft 30 to the radial outside.

Description

  The present invention relates to a mounting structure for a hollow member, and more particularly, to a hollow member for mounting a hollow member having a hollow cylindrical rotor core and an annular end plate disposed on at least one side in the axial direction of the rotor core to a rotor shaft. Mounting structure.

  2. Description of the Related Art Conventionally, a stator, a rotor having a rotor core and an end plate disposed on at least one side of the rotor core, and a rotor shaft passing through the rotor core and the end plate, the rotor shaft is spaced apart in the circumferential direction. The end plate has a crimping portion formed by crimping at a plurality of positions, and the end plate is fixed to the rotor shaft by the crimping portion and has a built-up portion that engages with the crimping portion in the circumferential direction. An electric machine has been proposed (see, for example, Patent Document 1). In this rotating electrical machine, such a configuration prevents rotation of the end plate.

JP 2010-104208 A

  In a hollow member mounting structure in which a hollow member having a rotor core and an end plate is attached to a rotor shaft, one of the problems is to prevent rotational displacement of the end plate. And devising a different configuration having the same function is useful for improving the technology.

  The main object of the hollow member mounting structure of the present invention is to prevent the end plate from rotating relative to the rotor shaft.

  The hollow member mounting structure of the present invention employs the following means in order to achieve the main object described above.

The mounting structure of the hollow member of the present invention is
A hollow member mounting structure for mounting a hollow member having a hollow cylindrical rotor core and an annular end member disposed on at least one side in the axial direction of the rotor core to the rotor shaft,
The end plate is formed with a plurality of holes arranged in the circumferential direction,
The rotor shaft is formed with a plurality of projecting portions that are arranged in the circumferential direction and project in the axial direction,
The rotor core is disposed on the outer peripheral side of the rotor shaft, the end plate is disposed on the outer peripheral side of the rotor shaft, and the plurality of protrusions of the rotor shaft are inserted through the plurality of holes of the end plate, The hollow member is attached to the rotor shaft by caulking the protrusion of
This is the gist.

  In this hollow member mounting structure of the present invention, the rotor core is arranged on the outer peripheral side of the rotor shaft, and the end plate is inserted on the outer peripheral side of the rotor shaft, and the plurality of protrusions of the rotor shaft are inserted into the plurality of holes of the end plate. The hollow member is attached to the rotor shaft by arranging and caulking the plurality of protrusions radially outward. This can prevent the end plate from rotating relative to the rotor shaft.

It is sectional drawing which shows an example of the cross section of the rotor 20 to which the attachment structure of the hollow member as one Example of this invention is applied. It is the side view (outside view) which looked at the rotor 20 of FIG. 1 from the right side. FIG. 4 is an explanatory view showing a state when the rotor core 22 and the end plates 24, 25 are attached to the rotor shaft 30.

  Next, the form for implementing this invention is demonstrated using an Example.

  FIG. 1 is a cross-sectional view showing an example of a cross section of a rotor 20 to which a hollow member mounting structure according to an embodiment of the present invention is applied. FIG. 2 is a side view of the rotor 20 of FIG. (External view). The rotor 20 to which this hollow member mounting structure is applied is used as a motor together with a stator (not shown).

  As shown in FIG. 1, the rotor 20 is fitted into a hollow cylindrical rotor core 22 formed by stacking a plurality of annular rotor members formed by punching a non-directional electromagnetic steel plate and a plurality of slots of the rotor core 22. The permanent magnet 23 to be inserted, the annular end plates 24 and 25 for pressing the end surfaces of the rotor core 22 and the permanent magnets 23 in the axial direction (rotator member stacking direction), and the rotor core 22 and the end plates 24 and 25 are attached. A rotor shaft 30.

  As shown in FIG. 1, the end plate 25 has an inner diameter smaller than the outer diameter of the mounting portion 33 of the rotor shaft 30, and as shown in FIG. 2, a plurality of end plates 25 (eight in FIG. 2) are arranged in the circumferential direction. A hole 26 is formed. As shown in FIG. 1, the plurality of holes 26 have a constant distance from the central axis when viewed in the axial direction on the radially inner surface, and on the rotor core 22 side (the left side in FIG. 1) on the radially outer surface. ) From the central axis toward the opposite side (right side in FIG. 1).

  As shown in FIG. 1, the rotor shaft 30 includes a hollow cylindrical input / output portion 31 for inputting and outputting power, and a hollow cylindrical mounting portion 33 having a diameter larger than that of the input / output portion 31. Are connected by a connecting portion 32 and formed integrally. The attachment portion 33 has a large-diameter portion 34 in contact with the surface of the end plate 24 opposite to the rotor core 22 side (the left-side surface in FIG. 1), and is continuous with the large-diameter portion 34 in the axial direction. An inner diameter portion 35 in contact with the inner peripheral side region of the peripheral surface and the end plate 24 side surface (the left side surface in FIG. 1) of the rotor core 22, and the inner peripheral surface of the rotor core 22 that is continuous with the intermediate diameter portion 35 in the axial direction. A small-diameter portion 36 in contact with the small-diameter portion 36, and a plurality of projecting portions 37 that are continuous with the small-diameter portion 36 in the axial direction and that are in contact with the radially outer surface of each of the plurality of holes 26 of the end plate 25 and project radially outward. Prepare. As shown in FIG. 2, the plurality of protrusions 37 are formed so that the circumferential length is substantially the same as the circumferential length of the plurality of holes 25 of the end plate 25 and slightly smaller than that. Before mounting, the distance from the central axis to the radially inner surface is substantially the same as the distance from the central axis to the radially inner surfaces of the plurality of holes 26 of the end plate 25 and protrudes to the right in the axial direction in FIG. (See FIG. 3A described later).

  In the thus configured rotor 20 of the embodiment, the convex portion formed at one place in the circumferential direction of the inner circumferential surface of the end plate 24 and the circumferential direction of the outer circumferential surface of the middle diameter portion 35 of the mounting portion 33 of the rotor shaft 30. The end plate 24 is attached to the rotor shaft 30 so as to mesh with an axial recess formed at one location of the end plate 24, so that the end plate 24 rotates integrally with the rotor shaft 30 (not relative rotation). ing. Moreover, the convex part formed in one place of the circumferential direction of the internal peripheral surface of the rotor core 22, and the axial recessed part formed in one place of the circumferential direction of the outer peripheral surface of the small diameter part 36 of the attaching part 33 of the rotor shaft 30 And the rotor core 22 is attached to the rotor shaft 30 so that the rotor core 22 and the rotor shaft 30 are engaged with each other. Further, the plurality of projecting portions 37 of the rotor shaft 30 project radially outward in a state of fitting into the plurality of holes 26 of the end plate 25, so that the end plate 25 rotates integrally with the rotor shaft 30. The rotor core 22 and the end plates 24 and 25 are not displaced to the right in FIG. The rotor core 22 and the end plates 24 and 25 are not displaced to the left in FIG. 1 by the large diameter portion 34 of the mounting portion 33 of the rotor shaft 30.

  FIG. 3 is an explanatory view showing a state when the rotor core 22 and the end plates 24 and 25 are attached to the rotor shaft 30. When the rotor core 22 and the end plates 24, 25 are attached to the rotor shaft 30, first, the rotor shaft 30 is brought into contact with the end plate 24, the rotor core 22, and the end plate 25 in the axial direction in this order from the state of FIG. (Between the rotor shaft 30 and the rotor shaft 30), the state shown in FIG. At this time, the end plate 25 is fitted into the rotor shaft 30 so that the plurality of protrusions 37 of the rotor shaft 30 are inserted into the plurality of holes 26. Then, in this state, the plurality of protrusions 37 of the attachment portion 33 of the rotor shaft 30 are arranged using a jig, and the radially outer surface of each protrusion 37 is radially outward of the corresponding hole 26 of the end plate 25. Further, the diameter of the projecting portion 27 is eliminated so that the axial clearance between the large diameter portion 34 of the mounting portion 33 of the rotor shaft 30, the end plate 25, the rotor core 22 and the end plate 24 is eliminated by the axial stress of the projecting portion 27. Caulking outward. As a result, the end plate 25 can be prevented from rotating relative to the rotor shaft 30, and the rotor core 22 and the end plates 24, 25 can be prevented from shifting to the right in the axial direction. For example, if a state in which a large force continues to act on the end plate 24 at a high temperature from the axial direction (left side or right side), the end plate 24 may be slightly deformed. Since the contact between the outer surface and the radially outer surfaces of the plurality of holes 26 of the end plate 25 continues, the end plate 25 can be prevented from rotating relative to the rotor shaft 30. The rotor core 22 and the end plates 24 and 25 can be prevented from shifting to the right in the axial direction. The rotor 20 thus configured is used as a motor together with the stator.

  According to the mounting structure of the hollow member of the embodiment described above, the end plate 24 and the rotor core 22 are fitted to the rotor shaft 30 (disposed on the outer peripheral side), and the end plate 25 is mounted to the plurality of holes 26. The rotor core 22 and the end plates 24 and 25 are fitted into the rotor shaft 30 so that the plurality of protrusions 37 of the portion 33 are inserted, and the plurality of protrusions 37 of the mounting portion 33 of the rotor shaft 30 are caulked outward in the radial direction. Is attached to the rotor shaft 30, the end plate 25 can be prevented from rotating relative to the rotor shaft 30, and the rotor core 22 and the end plates 24, 25 can be prevented from shifting in the axial direction.

  In the mounting structure of the hollow member of the embodiment, the end plate 24 side in the axial direction is prevented from being displaced in the axial direction by the large diameter portion 34 of the mounting portion 33 of the rotor shaft 30, and a plurality of end plate 25 sides are provided. The plurality of protrusions 37 of the mounting portion 33 of the rotor shaft 30 that are inserted through the holes 26 and caulked radially outward are prevented from being displaced in the axial direction. Similarly to the 25th side, it is good also as what is prevented from shifting | deviating to an axial direction by the some protrusion part of the attaching part 33 of the rotor shaft 30 penetrated by a some hole and crimped to the radial direction outer side. That is, the mounting portion 33 of the rotor shaft 30 is formed so as to be substantially symmetrical in the axial direction (left and right direction in FIG. 1) with the small diameter portion 36 interposed therebetween, and the end plate 24 is formed in the same manner as the end plate 25. The rotor core 22 may be attached to the rotor shaft 30 so as to be substantially symmetrical in the axial direction.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problems will be described. In the embodiment, the rotor shaft 30 corresponds to a “rotor shaft”, the rotor core 22 corresponds to a “rotor core”, and the end plate 25 corresponds to an “end plate”.

  The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem is the same as that of the embodiment described in the column of means for solving the problem. Therefore, the elements of the invention described in the column of means for solving the problems are not limited. That is, the interpretation of the invention described in the column of means for solving the problems should be made based on the description of the column, and the examples are those of the invention described in the column of means for solving the problems. It is only a specific example.

  As mentioned above, although the form for implementing this invention was demonstrated using the Example, this invention is not limited at all to such an Example, In the range which does not deviate from the summary of this invention, it is with various forms. Of course, it can be implemented.

  The present invention can be used in the motor manufacturing industry.

  20 Rotor, 22 Rotor core, 23 Permanent magnet, 24 End plate, 25 End plate, 26 Hole, 27 Protruding part, 30 Rotor shaft, 31 Input / output part, 32 Connecting part, 33 Mounting part, 34 Large diameter part, 35 Medium diameter Part, 36 small diameter part, 37 projecting part.

Claims (1)

A hollow member mounting structure for mounting a hollow member having a hollow cylindrical rotor core and an annular end member disposed on at least one side in the axial direction of the rotor core to the rotor shaft,
The end plate is formed with a plurality of holes arranged in the circumferential direction,
The rotor shaft is formed with a plurality of projecting portions that are arranged in the circumferential direction and project in the axial direction,
The rotor core is disposed on the outer peripheral side of the rotor shaft, the end plate is disposed on the outer peripheral side of the rotor shaft, and the plurality of protrusions of the rotor shaft are inserted through the plurality of holes of the end plate, The hollow member is attached to the rotor shaft by caulking the protrusion of
Hollow member mounting structure.

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