Rotor of electric motor

Abstract

A rotor of an electric motor according to the present disclosure is a rotor of an electric motor that imparts power to a rotating device, and is provided with: a rotor body that is rotatably disposed on the inner side of a stator and that has a recess on one axial end surface; an adapter which is attached to the rotor body in a state of being inserted into the recess, and into which a shaft part of the rotating device is inserted in a non-rotatable manner; and a fixing part which fixes the adapter to the rotor main body in a detachable manner.

Description

Technical Field

[0001] The present invention relates to a rotor of an electric motor, and more particularly to a rotor into which a shaft of a rotating device powered by the electric motor is inserted. Background Art

[0002] Patent Document 1 discloses a structure in which a protrusion formed on the rotating shaft of a motor engages with a groove formed on the central axis of a cutter roller. Therefore, in the invention described in Patent Document 1, the cutter roller can be rotated by transmitting the rotational force of the rotating shaft of the motor to the cutter roller.

[0003] As a structure for engaging a rotating device such as a cutter roller with a motor, there is conventionally known a Figure 7 Such an engagement structure is shown. In this engagement structure, the shaft 102 of the rotor 101 rotatably arranged inside the stator 100 is inserted into the insertion hole 105 of the shaft portion 104 of the rotating device 103 in a non-rotatable manner. In order to insert the shaft 102 of the rotor 101 into the insertion hole 105 of the shaft portion 104 of the rotating device 103 in a non-rotatable manner, for example, the shaft 102 with a thin tip is inserted into the insertion hole 105 to perform a taper fit, or the shaft 102 with spline teeth is inserted into the insertion hole 105 with spline teeth to perform a spline fit.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2004-357542 Summary of the invention

[0007] Problem that the invention aims to solve

[0008] In the case of taper fitting and spline fitting, if the structure of the insertion hole of the rotating device is different, the structure of the shaft will also be different. Therefore, for each rotating device with a different structure of the insertion hole, a motor rotor is required. In this case, it is necessary to prepare multiple motor rotors, and the cost of the motor becomes high. In the case of spline fitting, the spline teeth are worn due to micro vibrations, etc., so the motor needs to be replaced at regular intervals, which requires labor, time and cost. Therefore, it is desired to be able to easily and cheaply handle the rotor of the electric motor of the rotating device with different structures.

[0009] Solutions for solving problems

[0010] One form of the present disclosure is a rotor of an electric motor, which is a rotor of an electric motor that provides power to a rotating device, and comprises: a rotor body, which is rotatably arranged on the inner side of a stator and has a recessed portion on one axial end face; an adapter, which is installed on the rotor body in a state of being inserted into the recessed portion, and allows the shaft of the rotating device to be inserted in a non-rotatable manner; and a fixing portion, which fixes the adapter to the rotor body in a detachable manner.

[0011] Effects of the Invention

[0012] According to one aspect, it is possible to provide a rotor for an electric motor that can be easily and inexpensively adapted for use with rotating devices having different structures. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a left side view showing a usage state of the rotor of the electric motor according to the first embodiment of the present invention, and shows a part in cross section.

[0014] Figure 2 It is a left side view showing the rotor of the electric motor according to the first embodiment of the present invention in a state of use, and shows an exploded state with a part thereof being in cross section.

[0015] Figure 3 It is a front view showing the rotor of the electric motor according to the first embodiment of the present invention.

[0016] Figure 4 It is a left side view showing a use state of the rotor of the electric motor according to the second embodiment of the present invention, and shows a part in cross section.

[0017] Figure 5 It is a left side view showing a usage state of a first modified example of the rotor of the electric motor according to the first embodiment, and shows a part in cross section.

[0018] Figure 6 It is a left side view showing a usage state of a second modified example of the rotor of the electric motor according to the first embodiment, and shows a part in cross section.

[0019] Figure 7 It is a longitudinal sectional view showing a usage state of a rotor of a conventional electric motor. DETAILED DESCRIPTION

[0020] Hereinafter, a rotor of an electric motor according to one aspect of the present disclosure will be described with reference to the accompanying drawings. Figure 1 to Figure 3, an electric motor 2 having a rotor 1 according to a first embodiment is described. The electric motor 2 imparts power to a rotating device 3, and is, for example, a servo motor. The electric motor 2 includes a stator 4, a rotor 1, and a housing (not shown). In addition, hereinafter, an axial direction J1 is defined as a front-to-back direction. At this time, one end side of the axial direction J1 is defined as a front side, and the other end side of the axial direction J1 is defined as a rear side.

[0021] The stator 4 is held in the housing in such a manner that the axial direction J1 is along the front-rear direction. The stator 4 has a contact portion 5 on one end face in the axial direction J1 for contacting the rotating device 3. The contact portion 5 is annular and protrudes forward from the front surface of the stator 4. A coil (not shown) is wound around the stator 4.

[0022] The rotor 1 is provided inside the stator 4. The rotor 1 includes a rotor body 6 rotatably disposed inside the stator 4, an adapter 7 detachably mounted on the rotor body 6, and a fixing portion 8 detachably fixing the adapter 7 to the rotor body 6.

[0023] The rotor body 6 is arranged on the inner side of the stator 4 in such a manner that the axial direction J1 is along the front-to-back direction. The rotor body 6 receives a force from the rotating magnetic field generated by the voltage applied to the coil of the stator 4. As a result, the rotor body 6 can rotate around its axis A. In this way, the rotor body 6 is arranged on the inner side of the stator 4 in such a manner that it can rotate around the axis A. The rotor body 6 has a recess 10 on the front surface 9 which is one end face of the axial direction J1. The recess 10 is in the shape of a main view circle or a main view polygon and is open at the front. A plurality of threaded holes 11 opening forward are provided on the front surface 9 of the rotor body 6. The plurality of threaded holes 11 are arranged in a ring shape on an imaginary circle centered on the axis A. An internal thread is formed on the inner circumferential surface of each threaded hole 11. A plurality of insertion holes 12 opening forward are provided on the front surface 9 of the rotor body 6. The plurality of insertion holes 12 are arranged on an imaginary circle centered on the axis A. In the present embodiment, two insertion holes 12 are arranged at positions across the axis A.

[0024] The adapter 7 is made of iron, for example, and is in the shape of a cylinder into which the shaft portion 13 of the rotating device 3 is inserted. The adapter 7 is in the shape of a cylinder that is open in the axial direction J1. Figure 3 As shown, a plurality of spline teeth 14 protruding radially inwardly of the adapter 7 are provided on the inner circumferential surface of the adapter 7. The plurality of spline teeth 14 are arranged in a ring shape. The adapter 7 has a plate-shaped flange 15 extending radially outwardly of the adapter 7 at one end in the axial direction J1. The flange 15 is provided with a plurality of through holes 16 penetrating in the axial direction J1. The plurality of through holes 16 are arranged in a ring shape on an imaginary circle centered on the axis A. The flange 15 is provided with a plurality of through holes 17 penetrating in the axial direction J1. The plurality of through holes 17 are arranged on an imaginary circle centered on the axis A. In the present embodiment, two through holes 17 are arranged at positions separated by the axis A.

[0025] The shaft 13 of the rotating device 3 is provided with a spline tooth 18 that meshes with the spline tooth 14 of the adapter 7. The shaft 13 of the rotating device 3 is in the shape of a rod with a circular cross section. A plurality of spline teeth 18 are provided on the outer peripheral surface of the shaft 13 so as to protrude radially outward from the shaft 13. The plurality of spline teeth 18 are arranged in a ring shape.

[0026] The fixing portion 8 includes a screw member 19 screwed into the rotor body 6 via the adapter 7 and a pin 20 inserted into the rotor body 6 via the adapter 7. In the first embodiment, the screw member 19 is a bolt. The pin 20 is in the shape of a rod with a circular cross section.

[0027] like Figure 1 and Figure 2 As shown, in order to attach the adapter 7 to the rotor body 6, the adapter 7 is inserted into the recess 10 in such a manner that the flange 15 abuts against the front surface 9 of the rotor body 6. In order to fix the adapter 7 to the rotor body 6 in this state, the screw member 19 is screwed into the screw hole 11 of the rotor body 6 through the through hole 16 of the flange 15, and the pin 20 is inserted into the insertion hole 12 of the rotor body 6 through the through hole 17 of the flange 15. Thus, in a state where the adapter 7 is inserted into the recess 10 of the rotor body 6, the adapter 7 is attached to the rotor body 6 in a non-rotatable and detachable manner. In a state where the adapter 7 is attached to the rotor body 6, the adapter 7 and the rotor body 6 are arranged on the same axis. In addition, in the first embodiment, the diameter of the insertion hole 12 for the pin 20 to be inserted is larger than the diameter of the through hole 17 for the pin 20 to pass through.

[0028] The motor 2 and the rotating device 3 of such a structure are connected by the engagement of the rotor 1 of the motor 2 and the shaft 13 of the rotating device 3. In the first embodiment, the shaft 13 is inserted into the adapter 7 in such a manner that the spline teeth 14 of the adapter 7 mesh with the spline teeth 18 of the shaft 13, so that the rotor 1 of the motor 2 and the shaft 13 of the rotating device 3 are engaged. That is, the rotor 1 of the motor 2 and the shaft 13 of the rotating device 3 are spline-matched. Therefore, the shaft 13 of the rotating device 3 is inserted into the adapter 7 in a non-rotatable manner and rotates together with the rotor body 6. In this way, the motor 2 and the rotating device 3 are connected, and therefore, the rotating device 3 can be given power due to the rotation of the rotor 1 of the motor 2. In addition, in the first embodiment, the shaft 13 can be prevented from being excessively inserted into the adapter 7 by the rotating device 3 contacting the contact portion 5 of the stator 4.

[0029] In the case of the first embodiment, the shaft 13 of the rotating device 3 is engaged with the adapter 7 detachably mounted on the rotor body 6. Due to such a structure, by preparing adapters 7 corresponding to shafts 13 with different structures in advance, a plurality of rotating devices 3 with different structures of the shaft 13 can be connected to the motor 2 by simply replacing the adapter 7. Therefore, according to the rotor 1 of the first embodiment, it is possible to easily and inexpensively handle the rotating devices 3 with different structures of the shaft 13.

[0030] In the first embodiment, when power is transmitted from the motor 2 to the rotating device 3, the shaft 13 of the rotating device 3 contacts the adapter 7. Therefore, according to the first embodiment, it is the adapter 7 that is worn due to contact with the shaft 13, and therefore only the adapter 7 needs to be replaced.

[0031] In the case of the first embodiment, the fixing portion 8 is a screw member 19 screwed into the rotor body 6 via the adapter 7. Therefore, according to the first embodiment, the adapter 7 can be easily attached to and detached from the rotor body 6. In the case of the first embodiment, the adapter 7 is fixed to the rotor body 6 using a plurality of screw members 19. Therefore, according to the first embodiment, the adapter 7 can be prevented from rotating relative to the rotor body 6 when power is transmitted from the motor 2 to the rotating device 3.

[0032] In the case of the first embodiment, the fixing portion 8 is a pin 20 inserted into the rotor body 6 via the adapter 7. Therefore, according to the first embodiment, by inserting the pin 20 into the rotor body 6, the adapter 7 can be positioned relative to the rotor body 6. That is, the screw hole 11 of the rotor body 6 and the through hole 16 of the adapter 7 can be easily positioned. In the case of the first embodiment, the adapter 7 is fixed to the rotor body 6 by a plurality of pins 20. Therefore, according to the first embodiment, the adapter 7 can be prevented from rotating relative to the rotor body 6 when power is transmitted from the motor 2 to the rotating device 3.

[0033] In the first embodiment, the diameter of the insertion hole 12 is larger than the diameter of the through hole 17. Due to such a structure, when the adapter 7 is removed from the rotor body 6, the pin 20 does not remain on the rotor body 6 side. Therefore, according to the first embodiment, the maintainability of the rotor 1 can be improved.

[0034] Next, use Figure 4 The second embodiment of the rotor of the present invention will be described. In addition, the components having the same reference numerals as those in the first embodiment have the same functions, and therefore, the description thereof may be omitted below. The configurations of the adapter 7 and the rotor body 6 of the rotor 1a of the second embodiment are different from those of the first embodiment.

[0035] The adapter 7 has an annular inlay portion 21 on the outer circumferential surface. The inlay portion 21 is annular in shape and protrudes from the outer circumferential surface of the adapter 7 to the radial outer side of the adapter 7 and is annular in shape and protrudes from the flange 15 to the other end side of the axial direction J1 of the adapter 7. The recessed portion 10 of the rotor body 6 has an annular inlay portion 22 at one end of the inner circumferential surface in the axial direction J1, into which the inlay portion 21 is inserted. The inlay portion 22 is annular in shape and protrudes from the inner circumferential surface of the recessed portion 10 to the radial inner side of the recessed portion 10.

[0036] like Figure 4 As shown, the inner fitting portion 21 of the adapter 7 is inserted into the fitted portion 22 of the recess 10 when the adapter 7 is mounted on the rotor body 6. When the inner fitting portion 21 of the adapter 7 is inserted into the fitted portion 22 of the recess 10, the outer peripheral surface of the inner fitting portion 21 of the adapter 7 abuts against the inner peripheral surface of the fitted portion 22 of the recess 10. When the outer peripheral surface of the inner fitting portion 21 abuts against the inner peripheral surface of the fitted portion 22, a cylindrical gap 23 is formed between the outer peripheral surface of the adapter 7 and the inner peripheral surface of the recess 10.

[0037] Due to such a structure, the adapter 7 can be positioned relative to the rotor body 6 by inserting the inner fitting portion 21 into the fitted portion 22. Therefore, according to the rotor 1a of the second embodiment, compared with the case where the adapter 7 is positioned relative to the rotor body 6 by abutting the outer peripheral surface of the adapter 7 with the inner peripheral surface of the recess 10, the processing area of ​​the portion used for positioning can be reduced. Therefore, the rotor 1a of the second embodiment can reduce the cost spent on processing. In the case of the second embodiment, the fitted portion 22 is provided at the opening of the recess 10. Therefore, according to the rotor 1a of the second embodiment, the detachability of the adapter 7 relative to the rotor body 6 can be improved.

[0038] Next, use Figure 5 and Figure 6 The modified example of the rotor of the present invention will be described. Note that components having the same reference numerals as those in the first embodiment have the same functions, and therefore, description thereof may be omitted below.

[0039] like Figure 5As shown, the structure of the adapter 7 of the rotor 1b of the first variant is different from that of the first embodiment. The adapter 7 has a flange 15 at a position closer to one end side of the axial direction J1 than the center portion of the axial direction J1. Therefore, in the first variant, one end 7a of the axial direction J1 of the cylindrical portion of the adapter 7 protrudes from the flange 15. In addition, the length of the axial direction J1 of the adapter 7 of the first variant is preferably longer than the length of the axial direction J1 of the adapter 7 of the first embodiment. In this case, the rotor 1b can more reliably prevent the deviation of the axis of the shaft portion 13 of the rotating device 3. In addition, a sufficient contact area can be ensured between the adapter 7 and the shaft portion 13 of the rotating device 3, and the surface pressure can be reduced, so that a larger rotational force can be transmitted.

[0040] like Figure 6 As shown, the structure of the adapter 7 of the rotor 1c of the second modified example is different from that of the first embodiment. In the second modified example, the top end of the shaft portion 13 of the rotating device 3 is tapered with a smaller diameter as it goes to the other end side of the axial direction J1. Therefore, the inner hole 24 of the adapter 7 is tapered with a smaller diameter as it goes to the other end side of the axial direction J1. Due to such a structure, the shaft portion 13 of the rotating device 3 and the adapter 7 are tapered by inserting the top end portion of the shaft portion 13 formed in a tapered shape into the inner hole 24 of the adapter 7. In addition, in this modified example, the nut member 27 is threadedly fixed to the external threaded portion provided at the top end of the shaft portion 13. The shaft portion 13 of the rotating device 3 and the inner hole 24 of the adapter 7 are fixed by the friction force generated by the tightening of the nut member 27, so that the end face 25 of the adapter 7 protrudes relative to the end face 26 of the shaft portion 13.

[0041] In addition, the present invention is not limited to the above-described embodiments and modifications, and modifications and improvements within the scope that can achieve the object of the present invention are included in the present invention.

[0042] For example, the adapter 7 is engaged with the shaft 13 of the rotating device 3 by spline fitting in the first embodiment or by taper fitting in the second modification, but the present invention is not limited thereto and the adapter 7 may be non-rotatable relative to the shaft of the rotating device.

[0043] For example, the inner fitting portion may be provided in the rotor 1b of the modification 1 and the rotor 1c of the modification 2. In this case, a fitted portion into which the inner fitting portion is inserted is provided on the inner peripheral surface of the recess 10 .

[0044] Description of Reference Numerals

[0045] 1. rotor; 2. electric motor; 3. rotating device; 4. stator; 6. rotor body; 7. adapter; 8. fixing portion; 9. one end surface; 10. recessed portion; 12. insertion hole; 13. shaft portion; 17. through hole; 19. threaded member; 20. pin; 21. embedded portion; 22. engaged portion.

Claims

1. A rotor of an electric motor, which is a rotor of an electric motor for imparting power to a rotating device, wherein: The rotor has: A rotor body, which is rotatably arranged inside the stator and has a recessed portion on one end surface in the axial direction; an adapter installed on the rotor body in a state of being inserted into the recess, into which the shaft of the rotating device is inserted in a non-rotatable manner; and A fixing portion fixes the adapter to the rotor body in a detachable manner.

2. The rotor of the electric motor according to claim 1, wherein: The fixing portion is a screw member screwed into the rotor body via the adapter.

3. The rotor of the electric motor according to claim 2, wherein: The fixing portion is a pin inserted into the insertion hole of the rotor body through the through hole of the adapter.

4. The rotor of the electric motor according to claim 3, wherein: The insertion hole has a diameter larger than a diameter of the through hole.

5. The rotor of the electric motor according to any one of claims 1 to 4, wherein: The adapter is in the shape of a tube into which the shaft portion is inserted, and has an annular inner fitting portion on the outer peripheral surface thereof protruding radially outward from the adapter. The recessed portion has, at one end portion in the axial direction of the inner peripheral surface, an annular fitted portion that protrudes radially inward of the recessed portion and into which the inner fitting portion is inserted.

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