JP2017163731A - Rotor and motor with speed reducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotor and a motor with a speed reducer which are more effectively made to be more compact and lightweight.SOLUTION: A rotor core 32 includes: a through hole 32a penetratingly formed in a shaft direction and capable of engaging with a rotating shaft 31; and a plurality of grasping cutout portions 34 formed on at least one end face of both end faces in the shaft direction and capable of receiving grasping claws of a grasping tool. The grasping cutout portions 34 communicate with the through hole 32a so that the grasping claws can grasp the outer peripheral surface of the rotating shaft 31.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a rotor and a motor with a reduction gear.

  For example, a wiper motor used as a drive source for a wiper mounted on a vehicle employs a so-called motor with a speed reducer in which a motor unit and a speed reduction unit that decelerates and outputs the rotation of the motor unit are integrated. There are many cases. The motor unit includes a rotor (rotor) in which a rotating shaft (motor shaft) is press-fitted into a rotor core, and a stator (stator) that forms a magnetic field for rotating the rotor. In many cases, a worm speed reduction mechanism including a worm shaft (worm portion) and a worm wheel meshed with the worm shaft is employed as the speed reduction portion. An output shaft is integrally provided on the worm wheel, and the wiper is driven through the output shaft.

Such a wiper motor has restrictions on the arrangement space on the vehicle body, the load weight, and the like. For this reason, various techniques for reducing the size and weight of the wiper motor have been disclosed.
For example, a technique is disclosed in which a rotating shaft and a worm shaft are integrally formed, and the rotating shaft is assembled so as to be supported only at both ends of a worm shaft housed in a gear case of a worm reduction mechanism.

JP 2006-31654 A

  By the way, in the above-described prior art, when the rotating shaft (worm shaft) is assembled to the gear case, the rotor side end of the rotating shaft is gripped with a gripping tool or the like and inserted into the gear case from the worm shaft side. For this reason, it is necessary to make the rotating shaft sufficiently protrude from one end surface in the axial direction of the rotor core so that the rotating shaft can be sufficiently gripped by a gripping tool or the like. For this reason, there exists a subject that a rotor will enlarge by the part which protruded, and mass will increase.

  Accordingly, the present invention has been made in view of the above-described circumstances, and provides a rotor and a motor with a reduction gear that can be more effectively reduced in size and weight.

  In order to solve the above-described problems, a rotor according to the present invention includes a rotating shaft and a rotor core attached to the rotating shaft, and the rotor core is formed to penetrate therethrough and can be fitted to the rotating shaft. A plurality of gripping openings formed on at least one end face of the both axial end faces and capable of receiving gripping claws of a gripping tool. The gripping claw communicates with the through hole so that the outer peripheral surface of the rotating shaft can be gripped.

By comprising in this way, a rotating shaft can fully be hold | gripped with a holding tool etc. from the axial direction one end surface side of a rotor core, without projecting a rotating shaft almost from the axial direction one end surface of a rotor core. For this reason, the axial length of a rotating shaft can be shortened and a rotor can be reduced in size and weight.
Moreover, the heat radiation area of the rotor core can be increased by forming the opening for gripping. For this reason, the temperature rise of the rotor at the time of a drive can be suppressed.

  In the rotor according to the present invention, the through hole is formed in a polygonal shape when viewed from the axial direction.

  By comprising in this way, the contact with a through-hole and a rotating shaft turns into a point contact. For this reason, for example, when the rotary shaft is press-fitted into the through hole, it is possible to prevent the press-fitting load from becoming larger than necessary due to manufacturing errors of the through hole and the rotary shaft.

  In the rotor according to the present invention, the through hole is formed in a regular polygonal shape when viewed from the axial direction.

  By comprising in this way, the point-contact location with the through-hole of a rotating shaft can be arrange | positioned at equal intervals in the circumferential direction. For this reason, it is possible to suppress the contact of the rotating shaft with the rotor core.

  In the rotor according to the present invention, three gripping claws are formed on one end face in the axial direction of the rotor core and are formed at equal intervals in the circumferential direction, and the number of squares of the through hole is set to a multiple of six. It is characterized by being.

  With this configuration, for example, when the rotary shaft is press-fitted into the through hole, the press-fit load applied to the outer peripheral surface of the rotary shaft is uniformly distributed in the circumferential direction. For this reason, centering of the rotating shaft with respect to the through hole (rotor core) can be facilitated.

  In the rotor according to the present invention, the gripping opening is formed to penetrate in the axial direction of the rotor core.

By comprising in this way, when forming a rotor core by laminating | stacking an electromagnetic steel plate, for example, all the shapes of the laminated electromagnetic steel plates can be made the same. For this reason, the processing cost of a rotor core can be reduced.
In addition, air passages can be formed in the rotor core by penetrating the opening for gripping. For this reason, turbulence can be generated by rotating the rotor, the rotor can be efficiently cooled, and the entire motor can be further cooled.

  A motor with a speed reducer according to the present invention includes the rotor described above, a stator that forms a magnetic field for rotating the rotor, and a worm speed reduction mechanism coupled to the rotor. A worm shaft integrated with the rotating shaft, and a worm wheel meshed with the worm shaft and integrated with the output shaft, the worm shaft at both ends of the worm shaft, and A bearing for rotatably supporting the rotating shaft is provided.

  By comprising in this way, the motor with a reduction gear which can achieve size reduction and weight reduction effectively can be provided.

According to the present invention, the rotating shaft can be sufficiently gripped by a gripping tool or the like from the one axial end surface side of the rotor core without substantially projecting the rotating shaft from the one axial end surface of the rotor core. For this reason, the axial length of a rotating shaft can be shortened and a rotor can be reduced in size and weight.
Moreover, the heat radiation area of the rotor core can be increased by forming the opening for gripping. For this reason, the temperature rise of the rotor at the time of a drive can be suppressed.

It is a perspective view of the motor with a reduction gear in the embodiment of the present invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view of a rotor in an embodiment of the present invention. It is a top view of the rotor core in the embodiment of the present invention. It is the B section enlarged view of FIG. It is the C section enlarged view of FIG. It is a top view of a rotor which shows the state which grasped one end side of a rotating shaft in an embodiment of the present invention with a grasping tool. It is sectional drawing which follows the DD line | wire of FIG.

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

(Motor with reduction gear)
1 is a perspective view of a motor 1 with a speed reducer, and FIG. 2 is a cross-sectional view taken along line AA of FIG.
As shown in FIGS. 1 and 2, the motor 1 with a speed reducer serves as a drive source for electrical components (for example, a wiper, a power window, a sunroof, an electric seat, etc.) mounted on a vehicle, for example. The motor 1 with a speed reducer includes a motor unit 2, a speed reduction unit 3 that decelerates and outputs the rotation of the motor unit 2, and a controller unit 4 that performs drive control of the motor unit 2. In the following description, the simple axial direction refers to the axial direction of the rotating shaft 31 of the motor unit 2, the simple circumferential direction refers to the circumferential direction of the rotating shaft 31, and simply refers to the radial direction. The radial direction of the rotating shaft 31 shall be said.

(Motor part)
The motor unit 2 includes a motor case 5, a substantially cylindrical stator 8 housed in the motor case 5, and a rotor 9 provided radially inside the stator 8 and rotatable with respect to the stator 8. It is equipped with.

(Motor case)
The motor case 5 is formed of a material having excellent heat dissipation, such as aluminum die casting. The motor case 5 includes a first motor case 6 and a second motor case 7 that are configured to be separable in the axial direction. The first motor case 6 and the second motor case 7 are each formed in a bottomed cylindrical shape, and the motor case 5 having an internal space is formed by fitting the respective openings 6a and 7a.

The first motor case 6 is integrally formed with the gear case 40 so that the bottom 10 is joined to the gear case 40 of the speed reduction unit 3. A through-hole 10 a through which the rotation shaft 31 of the rotor 9 can be inserted is formed at a substantially central portion in the radial direction of the bottom 10.
Further, on the inner peripheral surface of the first motor case 6, a stator internal fitting portion 18 having a diameter increased by a step is formed between the opening 6 a and the substantially axial center. The outer peripheral surface of the stator 8 is fitted to the stator inner fitting portion 18.

(Stator)
The stator 8 has a stator core 20 formed integrally with a core portion 21 that is formed in a substantially cylindrical shape and forms a magnetic path, and a plurality of teeth 22 that protrude radially inward from the stator core 20. Yes. The stator core 20 is formed by laminating a plurality of electromagnetic steel plates in the axial direction. The stator core 20 is not limited to the case where a plurality of electromagnetic steel plates are laminated in the axial direction, and may be formed, for example, by press-molding soft magnetic powder. The outer peripheral surface of the core portion 21 of the stator core 20 formed as described above is fitted into the stator inner fitting portion 18 of the first motor case 6.

  A resin insulator 23 is attached to the teeth 22 of the stator core 20 so as to cover the periphery of the teeth 22. A coil 24 is wound around each tooth 22 from above the insulator 23. Each coil 24 generates a magnetic field for rotating the rotor 9 by power feeding from the controller unit 4.

(Rotor)
FIG. 3 is a perspective view of the rotor 9.
As shown in FIGS. 2 and 3, the rotor 9 includes a rotating shaft 31, a columnar rotor core 32 that is externally fixed to the rotating shaft 31, and a ring-shaped magnet that is fitted to the outer peripheral surface of the rotor core 32. 33. The rotating shaft 31 is integrally formed with the worm shaft 44 that constitutes the speed reducing portion 3. Further, a tapered portion 31b that is flattened so as to be tapered is formed on the periphery of one end 31a on the opposite side of the rotating shaft 31 from the worm shaft 44.

4 is a plan view of the rotor core 32, and FIG. 5 is an enlarged view of a portion B in FIG.
As shown in FIGS. 3 to 5, the rotor core 32 is formed by laminating a plurality of electromagnetic steel plates in the axial direction. The rotor core 32 is not limited to the case where a plurality of electromagnetic steel plates are laminated in the axial direction, and may be formed, for example, by press-molding soft magnetic powder.
A through hole 32 a penetrating in the axial direction is formed at the substantially center in the radial direction of the rotor core 32. The rotary shaft 31 is press-fitted into the through hole 32a. Alternatively, the rotary shaft 31 may be inserted into the through hole 32a, and the rotor core 32 may be externally fixed to the rotary shaft 31 using an adhesive or the like.

  Here, the through-hole 32a is formed in a regular polygon. More specifically, the through hole 32a is formed in a regular octagon. The shape of the through hole 32a is not limited to a regular octagon, but may be a round hole. However, the through hole 32a is preferably formed in a polygonal shape. More preferably, the through hole 32a is formed in a regular polygon. In the case of a regular polygon, it is desirable that the number of vertices 32b of the through hole 32a is set to be a multiple of six. In the present embodiment, since the through hole 32a is formed in a regular octagon, the number of apexes 32b is set to be a multiple “18” of 6, which satisfies the above.

  Further, the rotor core 32 is formed with three gripping notches 34 around the through hole 32a at equal intervals in the circumferential direction. The gripping notch 34 is formed in an oval shape so as to be along the radial direction in plan view in the axial direction. The radially inner end of the gripping notch 34 communicates with the through hole 32a. That is, the inner side in the radial direction of the gripping notch 34 is open. In addition, the gripping notch 34 has the same width W1 in the circumferential direction from the opening edge 34a on the radially inner side to the arc portion 34b on the radially outer end. Further, the gripping notch 34 is formed so as to penetrate in the axial direction of the rotor core 32. In addition, the width W1 and the radial length L1 of the gripping notch 34 are set to allow insertion of a gripping claw 70a described later.

  Since the through-hole 32a and the gripping notch 34 are formed in communication, even though the through-hole 32a is formed in a regular octagon so that the number of the vertices 32b is 18, the actual vertex 32b Is reduced by the amount of the notch 34 for gripping formed. In other words, the regular polygon set so that the number of vertices 32b is a multiple of 6 does not limit the actual number of vertices 32b, but is the number of vertices that no longer exist due to the notch 34 for gripping. It also includes numbers.

Here, since the through-hole 32a is formed in a regular octagonal shape, three gripping notches 34 are formed, so that there is a gap between the gripping notches 34 adjacent in the circumferential direction. , There are four vertices 32b. Further, these four vertices 32b are arranged in three places at equal intervals in the circumferential direction.
Thus, in the state in which the three gripping notches 34 are formed, the through-hole 32a is set to be a regular polygon and the number of apexes 32b is a multiple of 6, so that the circumferential direction The number of apexes 32b between the gripping notch portions 34 adjacent to each other can be made the same.

  The magnet 33 fitted to the outer peripheral surface of the rotor core 32 is magnetized so that a plurality of magnetic poles are formed in order in the circumferential direction. For example, in this embodiment, the magnet 33 is magnetized to four poles. Further, the axial length of the magnet 33 is set substantially equal to the axial length of the rotor core 32.

(Decelerator)
Returning to FIGS. 1 and 2, the speed reduction unit 3 includes a gear case 40 to which the motor case 5 is attached, and a worm speed reduction mechanism 41 accommodated in the gear case 40. The gear case 40 is made of a material with excellent heat dissipation, such as aluminum die cast. The gear case 40 is formed in a box shape having an opening 40a on one surface, and has a gear housing portion 42 for housing the worm reduction mechanism 41 therein. The side wall 40b of the gear case 40 is formed with an opening 43 that communicates the through hole 10a of the first motor case 6 and the gear housing portion 42 at a location where the first motor case 6 is integrally formed. Yes.

  Further, three fixing brackets 54a, 54b, 54c are integrally formed on the side wall 40b of the gear case 40. These fixing brackets 54a, 54b and 54c are for fixing the motor 1 with a speed reducer to a vehicle body (not shown) or the like. The three fixing brackets 54a, 54b, 54c are arranged at substantially equal intervals in the circumferential direction so as to avoid the motor unit 2. Anti-vibration rubber 55 is attached to each of the fixed brackets 54a, 54b, 54c. The anti-vibration rubber 55 is for preventing vibrations when driving the motor 1 with a speed reducer from being transmitted to a vehicle body (not shown).

  Further, a substantially cylindrical bearing boss 49 projects from the bottom wall 40 c of the gear case 40. The bearing boss 49 is for rotatably supporting the output shaft 48 of the worm speed reduction mechanism 41. A plurality of ribs 52 are provided on the outer peripheral surface of the bearing boss 49. Thereby, the rigidity of the bearing boss 49 is ensured.

  The worm speed reduction mechanism 41 housed in the gear housing portion 42 includes a worm shaft 44 and a worm wheel 45 that meshes with the worm shaft 44. The worm shaft 44 is disposed coaxially with the rotation shaft 31 of the motor unit 2. The worm shaft 44 is rotatably supported by bearings 46 and 47 provided on the gear case 40 at both ends.

  A ring-shaped sensor magnet 49 is fitted and fixed on the worm shaft 44 on the motor unit 2 side and in front of the bearing 46. The sensor magnet 49 constitutes one of rotational position detectors 59 that detect the rotational position of the worm shaft 44. The magnetic detection element 58 that constitutes the other of the rotational position detection unit 59 is provided in the controller unit 4 that is disposed to face the worm wheel 45.

  The end of the worm shaft 44 on the motor unit 2 side protrudes through the bearing 46 to reach the opening 43 of the gear case 40. The projecting end portion of the worm shaft 44 and the end portion of the rotating shaft 31 of the motor unit 2 are joined, and the worm shaft 44 and the rotating shaft 31 are integrated. That is, the rotating shaft 31 is not rotatably supported by itself, and the worm shaft 44 integrated with the rotating shaft 31 is rotatably supported by the bearings 46 and 47 so that the rotating shaft 31 rotates. The shape is freely supported. Further, the rotational position detector 59 detects not only the worm shaft 44 but also the rotational position of the rotational shaft 31.

  The worm wheel 45 meshed with the worm shaft 44 is provided with an output shaft 48 at the center in the radial direction of the worm wheel 45. The output shaft 48 is arranged coaxially with the rotation axis direction of the worm wheel 45, and protrudes to the outside of the gear case 40 via the bearing boss 49 of the gear case 40. A spline 48 a that can be connected to an electrical component (not shown) is formed at the protruding tip of the output shaft 48.

  Further, a sensor magnet 53 is provided at the center in the radial direction of the worm wheel 45 on the side opposite to the side from which the output shaft 48 protrudes. The sensor magnet 53 constitutes one of rotational position detectors 60 that detect the rotational position of the worm wheel 45. The magnetic detection element 61 that constitutes the other of the rotational position detection unit 60 is provided in the controller unit 4 that is disposed opposite to the worm wheel 45 on the sensor magnet 53 side (opening 40a side of the gear case 40) of the worm wheel 45. ing.

(Controller part)
The controller unit 4 that performs drive control of the motor unit 2 includes a controller board 62 on which the magnetic detection elements 58 and 61 are mounted, and a cover 63 provided to close the opening 40a of the gear case 40. Yes. And the controller board | substrate 62 is opposingly arranged by the sensor magnet 53 side (opening 40a side of the gear case 40) of the worm wheel 45. As shown in FIG.

  The controller board 62 is obtained by forming a plurality of conductive patterns (not shown) on a so-called epoxy board. The controller board 62 is connected to a terminal portion of the coil 24 drawn from the stator core 20 of the motor unit 2 and is electrically connected to a terminal 64 a of a connector 64 provided on the cover 63. Furthermore, a switching element (not shown) such as an FET (Field Effect Transistor) that controls a current supplied to the coil 24 is mounted on the controller board 62.

(Operation of motor with reduction gear)
Next, operation | movement of the motor 1 with a reduction gear is demonstrated.
In the motor 1 with a speed reducer, the power supplied to the controller board 62 via the connector 64 is selectively supplied to each coil 24 of the motor unit 2 via a switching element or the like. Then, a predetermined magnetic field is formed in the stator 8 (the teeth 22), and a magnetic attractive force and a repulsive force are generated between the magnetic field and the magnet 33 of the rotor 9. Thereby, the rotor 9 rotates continuously.

When the rotor 9 rotates, the worm shaft 44 integrated with the rotating shaft 31 rotates, and further the worm wheel 45 meshed with the worm shaft 44 rotates. Then, the output shaft 48 connected to the worm wheel 45 rotates to drive a desired electrical component.
Here, since the gripping notch 34 is formed in the rotor core 32 of the rotor 9, the heat radiation area of the rotor core 32 is increased, and the temperature rise of the rotor 9 is suppressed. In addition, since the gripping notch 34 is formed to penetrate in the axial direction, air flows through the gripping notch 34. For this reason, when the rotor 9 rotates, turbulent airflow is generated, and the rotor 9 is efficiently cooled.

  Further, the controller board 62 is based on the result of detecting the rotational position of the worm shaft 44 (rotary shaft 31) and the worm wheel 45 detected by the magnetic detection elements 58 and 61 mounted on the controller board 62. Drive signal is generated. Thereby, the switching timing of a switching element etc. is controlled and the drive control of the motor part 2 is performed.

(Assembly method of rotor)
Next, a method for assembling the rotor 9 will be described.
As shown in FIG. 3, the rotor 9 is formed into a rotor assembly 90 by first assembling a rotor core 32, a magnet 33, bearings 46 and 47, and a sensor magnet 49 to the rotating shaft 31. When making the rotor assembly 90, the rotor core 32 is press-fitted from one end 31 a of the rotating shaft 31. At this time, since the tapered portion 31 b is formed at the periphery of the one end 31 a of the rotating shaft 31, the tapered portion 31 b serves as a guide, and the rotating shaft 31 is smoothly guided to the through hole 32 a of the rotor core 32.

  Moreover, as shown in FIGS. 4 and 5, since the through hole 32a is formed in a regular octagon, the contact between the through hole 32a and the rotating shaft 31 is a point contact. For this reason, the press-fit load is not increased more than necessary due to manufacturing errors of the through hole 32a and the rotary shaft 31. Further, since the apexes 32b of the through holes 32a are arranged at equal intervals in the circumferential direction, the point contact positions between the through holes 32a and the rotary shaft 31 are also at equal intervals in the circumferential direction. For this reason, the contact of the rotating shaft 31 with respect to the rotor core 32 is suppressed.

  Moreover, in the state where the three gripping notches 34 are formed, the through holes 32a are regular octagons (the number of apexes 32b is a multiple of 6), so that the gripping notches adjacent to each other in the circumferential direction. The number of vertices 32b between 34 is the same. For this reason, the press-fit load applied to the outer peripheral surface of the rotating shaft 31 is uniformly dispersed in the circumferential direction, and the centering of the rotating shaft 31 with respect to the through hole 32a (rotor core 32) can be facilitated.

FIG. 6 is an enlarged view of a portion C in FIG.
As shown in the figure, in a state in which the rotor core 32 is press-fitted into the rotating shaft 31, the rotating shaft 31 protrudes slightly from the end surface of the rotor core 32 opposite to the worm shaft 44. More specifically, the taper part 31b of the rotating shaft 31 should just protrude completely from the end surface of the rotor core 32. For example, when the length in the axial direction of the taper portion 31b is L2, and the length from the base end of the taper portion 31b to the end surface of the rotor core 32 is L3, the length L3 is:
0 mm ≦ L3 ≦ L2 (1)
It is only necessary to be set so as to satisfy.

As described above, after the rotor 9 is used as the rotor assembly 90 in advance, the worm shaft 44 of the rotor assembly 90 is inserted from the opening 43 of the gear case 40 into the inside. Then, by assembling the rotor assembly 90 in the gear case 40, the assembly of the rotor 9 is completed.
Here, when inserting the rotor assembly 90 into the gear case 40, the side opposite to the worm shaft 44 of the rotor assembly 90, that is, the one end 31 a side of the rotating shaft 31 is gripped by the gripping tool 70 (see FIG. 7).

FIG. 7 is a plan view of the rotor 9 showing a state in which the one end 31 a side of the rotating shaft 31 is gripped by the gripping tool 70. 8 is a cross-sectional view taken along the line DD of FIG.
As shown in FIGS. 7 and 8, the gripping tool 70 has three gripping claws 70 a so as to correspond to the number of gripping notches 34 formed in the rotor core 32. The gripping claws 70a are arranged at equal intervals in the circumferential direction.

  When gripping the one end 31 a of the rotating shaft 31 using the gripping tool 70 configured as described above, first, the gripping claw 70 a is inserted into the gripping notch portion 34 of the rotor core 32 from the one end 31 a side of the rotating shaft 31. Subsequently, the rotary shaft 31 is gripped by the gripping claws 70a (see arrows in FIGS. 7 and 8). Then, by inserting the rotor assembly 90 into the gear case 40 in this state, the rotor assembly 90 can be easily assembled in the gear case 40.

  As described above, in the above-described embodiment, the gripping notch 34 capable of receiving the gripping claws 70 a is formed in the rotor core 32, and the gripping notch 34 is communicated with the through hole 32 a of the rotor core 32. For this reason, the one end 31a of the rotating shaft 31 can be sufficiently gripped by the gripping claws 70a without substantially projecting the one end 31a of the rotating shaft 31 from the end face of the rotor core 32. For this reason, the axial length of the rotating shaft 31 can be shortened, and the rotor 9 can be reduced in size and weight.

Further, the heat release area of the rotor core 32 can be increased by forming the gripping notch 34 in the rotor core 32. For this reason, the temperature rise of the rotor 9 at the time of driving the motor part 2 can be suppressed.
Moreover, since the gripping notch 34 is formed so as to penetrate in the axial direction of the rotor core 32, an air passage can be formed in the rotor core 32. For this reason, when the rotor 9 rotates, turbulent airflow is generated, the rotor 9 can be efficiently cooled, and the entire motor unit 2 can be further cooled.
Further, when the rotor core 32 is formed by laminating the electromagnetic steel plates, for example, by forming the gripping notches 34 in the axial direction of the rotor core 32, all the shapes of the laminated magnetic steel plates are made the same. Can do. For this reason, the processing cost of the rotor core 32 can be reduced.

Further, since the through hole 32a of the rotor core 32 is formed in a regular octagon, the contact between the through hole 32a and the rotating shaft 31 is a point contact. For this reason, it is possible to prevent the press-fit load from becoming unnecessarily large due to manufacturing errors of the through hole 32a and the rotating shaft 31.
Further, since the apexes 32b of the through holes 32a are arranged at equal intervals in the circumferential direction, the point contact positions between the through holes 32a and the rotary shaft 31 are also at equal intervals in the circumferential direction. For this reason, it is possible to suppress the contact of the rotating shaft 31 with the rotor core 32.

  Moreover, in the state where the three gripping notches 34 are formed, the through holes 32a are regular octagons (the number of apexes 32b is a multiple of 6), so that the gripping notches adjacent to each other in the circumferential direction. The number of vertices 32b between 34 is the same. For this reason, the press-fit load applied to the outer peripheral surface of the rotating shaft 31 is uniformly dispersed in the circumferential direction, and the centering of the rotating shaft 31 with respect to the through hole 32a (rotor core 32) can be facilitated.

The present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
For example, in the above-described embodiment, the case where the motor 1 with a reduction gear is a drive source for electrical components (for example, a wiper, a power window, a sunroof, an electric seat, etc.) mounted on the vehicle has been described. However, it is not restricted to this, The motor 1 with a reduction gear can be used for various uses. Furthermore, it is not restricted to the motor 1 with a reduction gear, The above-mentioned embodiment can be employ | adopted for various motor single-piece | units.

Further, in the above-described embodiment, the case has been described in which the rotor core 32 has the three gripping notches 34 formed around the through hole 32a at equal intervals in the circumferential direction. In addition, the case where the gripping notch portion 34 is formed in an oval shape along the radial direction in an axial plan view has been described. Further, the case where the gripping notch 34 is formed penetrating in the axial direction of the rotor core 32 has been described.
However, the present invention is not limited to this, and the number of gripping notches 34 can be arbitrarily set according to the number of gripping claws 70a. Further, the shape of the gripping notch 34 only needs to be a shape into which the gripping claw 70a can be inserted. Further, the gripping notch 34 may not be formed through the rotor core 32, and may be formed in a concave shape as long as the gripping claw 70a can be received.

DESCRIPTION OF SYMBOLS 1 ... Motor with a reduction gear 2 ... Motor part 3 ... Reduction part 8 ... Stator 9 ... Rotor 31 ... Rotating shaft 32 ... Rotor core 32a ... Through-hole 32b ... Apex 34 ... Gripping notch (gripping opening)
41 ... Worm speed reducing mechanism 44 ... Worm shaft 45 ... Worm wheel 70 ... Holding tool 70a ... Holding jaw

Claims (6)

A rotation axis;
A rotor core attached to the rotating shaft;
With
The rotor core is
A through-hole formed in the axial direction and fitable with the rotating shaft;
A plurality of grip openings that are formed on at least one end face of the axial end faces and can accept grip claws of the grip tool,
Have
The rotor, wherein the gripping opening is in communication with the through hole so that the gripping claw can grip the outer peripheral surface of the rotating shaft.   The rotor according to claim 1, wherein the through hole is formed in a polygonal shape when viewed from the axial direction.   The rotor according to claim 2, wherein the through hole is formed in a regular polygonal shape when viewed from the axial direction. The gripping claws are formed on one end surface in the axial direction of the rotor core, and are formed at equal intervals in the circumferential direction.
The rotor according to claim 3, wherein the number of squares of the through hole is set to a multiple of six.   The rotor according to any one of claims 1 to 4, wherein the holding opening is formed so as to penetrate in the axial direction of the rotor core. The rotor according to any one of claims 1 to 5,
A stator that forms a magnetic field for rotating the rotor;
A worm reduction mechanism coupled to the rotor;
With
The worm deceleration mechanism is
A worm shaft integrated with the rotating shaft;
A worm wheel meshed with the worm shaft and integrated with the output shaft;
With
A motor with a speed reducer, characterized in that bearings for rotatably supporting the worm shaft and the rotating shaft are provided at both ends of the worm shaft.

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