JP2020182377A - Manufacturing method of motor with reduction gear - Google Patents

Abstract

To provide a manufacturing method of a motor with a reduction gear capable of more effectively reducing the size and weight of the motor with a rotor and the reduction gear.SOLUTION: A manufacturing method of a motor with a reduction gear includes steps of assembling a rotor core 32 and bearings 46, 47 on a rotary shaft 31 and assembling a rotor assembly 90 so that an end face of the rotor core 32 on which a gripping notch 34 is formed is located at one end 31A on the opposite side of a worm shaft of the rotary shaft 31, inserting a gripping claw of a gripping tool from the gripping notch 34 on one end surface of the rotor assembly 90 and gripping one end 31A of the rotary shaft 31 with the gripping claw after the assembly step, and inserting the rotor assembly 90 into a gear case and assembling the rotor assembly in a state of gripping one end 31A of the rotary shaft 31 after the gripping step.SELECTED DRAWING: Figure 3

Description

The present invention relates to a method for manufacturing a motor with a speed reducer.

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

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

Japanese Unexamined Patent Publication No. 2006-31165

By the way, in the above-mentioned conventional technique, when assembling the rotary shaft (worm shaft) to the gear case, the rotor side end of the rotary shaft is gripped by a gripping tool or the like and inserted into the gear case from the worm shaft side. Therefore, it is necessary to sufficiently project the rotating shaft 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. Therefore, there is a problem that the rotor becomes larger by the amount of the protrusion and the mass increases.

Therefore, the present invention has been made in view of the above circumstances, and provides a method for manufacturing a motor with a speed reducer, which can more effectively reduce the size and weight of the rotor and the motor with a speed reducer.

In order to solve the above problems, the method for manufacturing a motor with a speed reducer according to the present invention includes a rotor, a worm reduction mechanism connected to the rotor, and a gear case for accommodating the worm reduction mechanism inside. The rotor includes a rotating shaft and a rotor core attached to the rotating shaft. The rotor core is formed through the rotating shaft, and has a through hole that can be fitted with the rotating shaft and both end faces in the axial direction. The worm deceleration mechanism has a plurality of openings that are formed on at least one end surface on the opposite side of the worm deceleration mechanism and communicate with the through hole, and the worm deceleration mechanism is integrated with the rotation shaft. A method for manufacturing a motor with a speed reducer, which has a shaft and is provided with a shaft and bearings for rotatably supporting the worm shaft and the rotating shaft only at both ends of the worm shaft. The assembly step of assembling the rotor assembly by assembling the rotor core and the bearing so that the end face of the rotor core having the opening formed is located at one end of the rotation shaft opposite to the worm shaft. After the assembly step, the gripping claw of the gripping tool is inserted from the opening of the one end surface of the rotor assembly, and the one end of the rotating shaft is gripped by the gripping claw, and after the gripping step, It is characterized by having an assembling step of inserting and assembling the rotor assembly into the gear case while grasping the one end of the rotating shaft.

According to the present invention, the rotating shaft is sufficiently gripped by a gripping tool or the like from the axial end surface side of the rotor core without projecting the rotating shaft from one end surface of the rotor core on the side opposite to the worm deceleration mechanism. be able to. Therefore, the shaft length of the rotating shaft can be shortened, and the rotor can be made smaller and lighter. That is, the motor with a speed reducer equipped with a rotor can be made smaller and lighter.
Further, by forming the gripping opening, the heat dissipation area of the rotor core can be increased. Therefore, it is possible to suppress the temperature rise of the rotor during driving.

It is a perspective view of the motor with a reduction gear in embodiment of this invention. It is sectional drawing which follows the AA line of FIG. It is a perspective view of the rotor in embodiment of this invention. It is a top view of the rotor core in embodiment of this invention. It is the B part enlarged view of FIG. It is the C part enlarged view of FIG. It is a top view of the rotor which shows the state which one end side of the rotary shaft in embodiment of this invention is gripped by the gripping tool. It is sectional drawing which follows the DD line of FIG.

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

(Motor with reducer)
FIG. 1 is a perspective view of the motor 1 with a speed reducer, and FIG. 2 is a cross-sectional view taken along the line AA of FIG. As shown in FIGS. 1 and 2, the motor 1 with a speed reducer is, for example, a drive source for electrical components (for example, wipers, power windows, sunroofs, electric seats, etc.) mounted on a vehicle. 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 controls the drive of the motor unit 2. In the following description, the term "axial direction" refers to the axial direction of the rotating shaft 31 of the motor unit 2, the term "circumferential direction" refers to the circumferential direction of the rotating shaft 31, and the term simply "radial direction" It refers to the radial direction of the rotating shaft 31.

(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 inside the stator 8 in the radial direction and rotatably provided with respect to the stator 8. , Is equipped.

(Motor case)
The motor case 5 is made 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 which are configured to be rotatable in the axial direction. The first motor case 6 and the second motor case 7 are each formed in a bottomed tubular shape, and the motor cases 5 having an internal space are formed by fitting the openings 6a and 7a, respectively.

The first motor case 6 is integrally molded with the gear case 40 so that the bottom portion 10 is joined to the gear case 40 of the reduction gear portion 3. A through hole 10a through which the rotating shaft 31 of the rotor 9 can be inserted is formed at substantially the center of the bottom portion 10 in the radial direction.
Further, on the inner peripheral surface of the first motor case 6, a stator inner fitting portion 18 having an enlarged diameter formed by a step is formed between the opening 6a and the substantially center in the axial direction. 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 in which a core portion 21 formed in a substantially cylindrical shape and forming a magnetic path, and a plurality of teeth 22 protruding inward in the radial direction from the stator core 20 are integrally formed. There is. 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 sheets are laminated in the axial direction, and may be formed, for example, by pressure molding soft magnetic powder. The outer peripheral surface of the core portion 21 of the stator core 20 formed in this way is internally fitted into the stator inner fitting portion 18 of the first motor case 6.

Further, 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. Then, the 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 supplying power 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 cylindrical 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 and. The rotating shaft 31 is integrally molded with the worm shaft 44 that constitutes the deceleration unit 3. Further, a tapered portion 31b flattened so as to be tapered is formed on the peripheral edge of one end 31a of the rotating shaft 31 opposite to the worm shaft 44.

FIG. 4 is a plan view of the rotor core 32, and FIG. 5 is an enlarged view of part B of 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 sheets are laminated in the axial direction, and may be formed, for example, by pressure molding soft magnetic powder.
A through hole 32a penetrating in the axial direction is formed substantially in the center of the rotor core 32 in the radial direction. The rotating shaft 31 is press-fitted into the through hole 32a. The rotating shaft 31 may be inserted into the through hole 32a, and the rotor core 32 may be externally fitted and fixed to the rotating shaft 31 using an adhesive or the like.

Here, the through hole 32a is formed in a regular polygonal shape. More specifically, the through hole 32a is formed in a regular octagonal shape. The shape of the through hole 32a is not limited to the regular octagonal shape, and may be a round hole. However, it is desirable that the through hole 32a is formed in a polygonal shape. More preferably, the through hole 32a is formed in a regular polygonal shape. 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 6. In the present embodiment, since the through hole 32a is formed in a regular octagonal shape, the number of the vertices 32b is set to be a multiple "18" of 6, which satisfies the above.

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

Since the through hole 32a and the gripping notch 34 are formed in communication with each other, even if the through hole 32a is formed in a regular octagonal shape so that the number of vertices 32b is 18, the actual apex 32b The number of is reduced by the amount of the gripping notch 34 being formed. That is, the regular polygon in which the number of vertices 32b is set to be a multiple of 6 does not limit the actual number of vertices 32b, and the number of vertices that are no longer present due to the gripping notch 34. It also includes numbers.

Here, while the through hole 32a is formed in a regular octagonal shape, three gripping notches 34 are formed, so that there are three gripping notches 34 adjacent to each other in the circumferential direction. , Each of which has four vertices 32b. Further, these four vertices 32b are arranged at three locations at equal intervals in the circumferential direction.
In this way, in the state where the three gripping notches 34 are formed, the through holes 32a are set to be a regular polygon and the number of vertices 32b is a multiple of 6, thereby setting the through holes 32a in the circumferential direction. The number of vertices 32b between the gripping notches 34 adjacent to each other can be 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 sequentially formed 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 to be substantially equal to the axial length of the rotor core 32.

(Deceleration part)
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 housed in the gear case 40. The gear case 40 is made of a material having excellent heat dissipation such as aluminum die casting. The gear case 40 is formed in a box shape having an opening 40a on one surface, and has a gear accommodating portion 42 for accommodating the worm reduction mechanism 41 inside. Further, on the side wall 40b of the gear case 40, an opening 43 for communicating the through hole 10a of the first motor case 6 and the gear accommodating portion 42 is formed at a portion where the first motor case 6 is integrally molded. There is.

Further, three fixing brackets 54a, 54b, 54c are integrally molded on the side wall 40b of the gear case 40. These fixing brackets 54a, 54b, 54c are for fixing the motor 1 with a speed reducer to a vehicle body or the like (not shown). The three fixing brackets 54a, 54b, 54c are arranged at substantially equal intervals in the circumferential direction so as to avoid the motor portion 2. Anti-vibration rubber 55 is attached to each of the fixing brackets 54a, 54b, 54c. The anti-vibration rubber 55 is for preventing vibration 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 is projected from the bottom wall 40c of the gear case 40. The bearing boss 49 is for rotatably supporting the output shaft 48 of the worm reduction mechanism 41. Further, a plurality of ribs 52 are provided on the outer peripheral surface of the bearing boss 49. As a result, the rigidity of the bearing boss 49 is ensured.

The worm reduction mechanism 41 housed in the gear accommodating portion 42 is composed of a worm shaft 44 and a worm wheel 45 meshed with the worm shaft 44. The worm shaft 44 is arranged coaxially with the rotating shaft 31 of the motor unit 2. The worm shaft 44 is rotatably supported at both ends by bearings 46 and 47 provided on the gear case 40.

A ring-shaped sensor magnet 50 is externally fitted and fixed on the motor portion 2 side of the worm shaft 44 and in front of the bearing 46. The sensor magnet 50 constitutes one of the rotation position detection units 59 that detects the rotation position of the worm shaft 44. The magnetic detection element 58 constituting the other side of the rotation position detection unit 59 is provided in the controller unit 4 which is arranged to face the worm wheel 45.

Further, the end of the worm shaft 44 on the motor portion 2 side protrudes through the bearing 46 to the opening 43 of the gear case 40. The end of the protruding worm shaft 44 and the end 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. It has a shape that is freely supported. Further, the rotation position detection unit 59 detects not only the worm shaft 44 but also the rotation position of the rotation shaft 31.

The worm wheel 45 meshed with the worm shaft 44 is provided with an output shaft 48 at the center of the worm wheel 45 in the radial direction. The output shaft 48 is arranged coaxially with the rotation axis direction of the worm wheel 45, and projects to the outside of the gear case 40 via the bearing boss 49 of the gear case 40. A spline 48a 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 of the worm wheel 45 in the radial direction on the side opposite to the side on which the output shaft 48 is projected. The sensor magnet 53 constitutes one of the rotation position detection units 60 that detects the rotation position of the worm wheel 45. The magnetic detection element 61 that constitutes the other side of the rotation position detection unit 60 is provided on the controller unit 4 that is arranged to face 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 controls the drive of the motor unit 2 has a controller board 62 on which the magnetic detection elements 58 and 61 are mounted, and a cover 63 provided so as to close the opening 40a of the gear case 40. There is. The controller board 62 is arranged to face the sensor magnet 53 side of the worm wheel 45 (the opening 40a side of the gear case 40).

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

(Operation of motor with reducer)
Next, the operation of the motor 1 with a speed reducer will be described.
In the motor 1 with a speed reducer, the electric 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 (teeth 22), and a magnetic attraction force or a repulsive force is generated between this magnetic field and the magnet 33 of the rotor 9. As a result, the rotor 9 continuously rotates.

When the rotor 9 rotates, the worm shaft 44 integrated with the rotating shaft 31 rotates, and the worm wheel 45 meshed with the worm shaft 44 rotates. Then, the output shaft 48 connected to the worm wheel 45 rotates, and the desired electrical component is driven.
Here, since the rotor core 32 of the rotor 9 is formed with a notch for gripping 34, the heat dissipation area of the rotor core 32 is increased, and the temperature rise of the rotor 9 is suppressed. Further, since the gripping notch 34 is formed to penetrate in the axial direction, air is passed through the gripping notch 34. Therefore, turbulence is generated by the rotation of the rotor 9, and the rotor 9 is efficiently cooled.

Further, the controller board 62 is a power module 65 based on the rotation position detection results of the worm shaft 44 (rotation shaft 31) and the worm wheel 45 detected by the magnetic detection elements 58 and 61 mounted on the controller board 62. Generates a drive signal for. As a result, the switching timing of the switching element or the like is controlled, and the drive control of the motor unit 2 is performed.

(Rotor assembly method)
Next, a method of 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 the rotor core 32, the magnet 33, the bearings 46, 47, and the sensor magnet 50 to the rotating shaft 31. When the rotor assembly 90 is formed, the rotor core 32 is press-fitted from one end 31a of the rotating shaft 31. At this time, since the tapered portion 31b is formed on the peripheral edge of one end 31a of the rotating shaft 31, the tapered portion 31b serves as a guide to smoothly guide the rotating shaft 31 to the through hole 32a of the rotor core 32.

Further, as shown in FIGS. 4 and 5, since the through hole 32a is formed in a regular octagonal shape, the contact between the through hole 32a and the rotating shaft 31 is a point contact. Therefore, the press-fitting load does not become larger than necessary due to the manufacturing error of the through hole 32a and the rotating shaft 31. Further, since the vertices 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 rotation shaft 31 are also at equal intervals in the circumferential direction. Therefore, one-sided contact of the rotating shaft 31 with respect to the rotor core 32 is suppressed.

Moreover, since the through hole 32a is a regular octagon (the number of vertices 32b is a multiple of 6) in the state where three gripping cutouts 34 are formed, the gripping cutouts adjacent to each other in the circumferential direction are formed. The numbers of vertices 32b between 34 are all the same. Therefore, the press-fitting load applied to the outer peripheral surface of the rotating shaft 31 is uniformly distributed in the circumferential direction, and the centering of the rotating shaft 31 with respect to the through hole 32a (rotor core 32) can be easily performed.

FIG. 6 is an enlarged view of part C of FIG.
As shown in the figure, when the rotor core 32 is press-fitted into the rotating shaft 31, the rotating shaft 31 only slightly protrudes from the end surface of the rotor core 32 opposite to the worm shaft 44. More specifically, the tapered portion 31b of the rotating shaft 31 may completely protrude from the end face of the rotor core 32. For example, when the axial length of the tapered portion 31b is L2 and the length from the base end of the tapered portion 31b to the end face of the rotor core 32 is L3, the length L3 is
0 mm ≤ L3 ≤ L2 ... (1)
It suffices if it is set to the extent that it satisfies.

In this way, after the rotor 9 is made into the rotor assembly 90 in advance, the worm shaft 44 of the rotor assembly 90 is inserted into the inside through the opening 43 of the gear case 40. Then, by assembling the rotor assembly 90 in the gear case 40, the assembly of the rotor 9 is completed.
Here, when the rotor assembly 90 is inserted into the gear case 40, the side opposite to the worm shaft 44 of the rotor assembly 90, that is, the one end 31a 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 one end 31a side of the rotating shaft 31 is gripped by the gripping tool 70. FIG. 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 70a 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 one end 31a of the rotating shaft 31 using the gripping tool 70 configured in this way, first, the gripping claw 70a is inserted into the gripping notch 34 of the rotor core 32 from the one end 31a side of the rotating shaft 31. Subsequently, the rotating shaft 31 is gripped by the gripping claw 70a (see the 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 portion 34 capable of receiving the gripping claw 70a is formed in the rotor core 32, and the gripping notch portion 34 is communicated with the through hole 32a of the rotor core 32. Therefore, one end 31a of the rotating shaft 31 can be sufficiently gripped by the gripping claw 70a without projecting one end 31a of the rotating shaft 31 from the end surface of the rotor core 32. Therefore, the shaft length of the rotating shaft 31 can be shortened, and the rotor 9 can be made smaller and lighter.

Further, the heat dissipation area of the rotor core 32 can be increased by the amount of forming the gripping notch 34 in the rotor core 32. Therefore, it is possible to suppress the temperature rise of the rotor 9 when the motor unit 2 is driven.
Moreover, since the gripping notch 34 is formed through the rotor core 32 in the axial direction, an air passage can be formed in the rotor core 32. Therefore, the rotation of the rotor 9 generates turbulence, which can efficiently cool the rotor 9 and further cool the entire motor unit 2.
Further, when the rotor core 32 is formed by forming the gripping notch 34 through the rotor core 32 in the axial direction, for example, by laminating the electromagnetic steel plates, the shapes of the laminated electromagnetic steel plates are all the same. Can be done. Therefore, 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 octagonal shape, the contact between the through hole 32a and the rotating shaft 31 is a point contact. Therefore, it is possible to prevent the press-fitting load from becoming unnecessarily large due to a manufacturing error of the through hole 32a and the rotating shaft 31.
Further, since the vertices 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 rotation shaft 31 are also at equal intervals in the circumferential direction. Therefore, it is possible to suppress one-sided contact of the rotating shaft 31 with respect to the rotor core 32.

Moreover, since the through hole 32a is a regular octagon (the number of vertices 32b is a multiple of 6) in the state where three gripping cutouts 34 are formed, the gripping cutouts adjacent to each other in the circumferential direction are formed. The numbers of vertices 32b between 34 are all the same. Therefore, the press-fitting load applied to the outer peripheral surface of the rotating shaft 31 is uniformly distributed in the circumferential direction, and the centering of the rotating shaft 31 with respect to the through hole 32a (rotor core 32) can be easily performed.

The present invention is not limited to the above-described embodiment, and includes various modifications of 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 speed reducer is a drive source for electrical components (for example, a wiper, a power window, a sunroof, an electric seat, etc.) mounted on a vehicle has been described. However, the present invention is not limited to this, and the motor 1 with a speed reducer can be used for various purposes. Further, the above-described embodiment can be adopted not only for the motor 1 with a speed reducer but also for various motors alone.

Further, in the above-described embodiment, the case where the rotor core 32 is formed with three gripping notches 34 around the through hole 32a at equal intervals in the circumferential direction has been described. Further, the case where the gripping notch portion 34 is formed in an oval shape along the radial direction in the axial plan view has been described. Further, the case where the gripping notch portion 34 is formed through the rotor core 32 in the axial direction has been described.
However, the number is not limited to these, 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 may be such that 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 accepted.

1 ... motor with speed reducer, 2 ... motor unit, 3 ... deceleration unit, 4 ... controller unit, 5 ... motor case, 6 ... first motor case, 6a ... opening, 7 ... second motor case, 7a ... opening , 8 ... stator, 9 ... rotor, 10 ... bottom, 10a ... through hole, 18 ... stator inner fitting, 20 ... stator core, 21 ... core, 22 ... teeth, 23 ... insulator, 24 ... coil, 31 ... rotating shaft , 31a ... one end, 31b ... taper portion, 32 ... rotor core, 32a ... through hole, 32b ... apex, 33 ... magnet, 34 ... gripping notch (opening), 34a ... opening edge, 34b ... arc portion, 40 ... gear case, 40a ... opening, 40b ... side wall, 40c ... bottom wall, 41 ... worm reduction mechanism, 42 ... gear housing, 43 ... opening, 44 ... worm shaft, 45 ... worm wheel, 46 ... bearing, 47 ... Bearing, 48 ... Output shaft, 48a ... Spline, 49 ... Bearing boss, 50 ... Sensor magnet, 52 ... Rib, 53 ... Sensor magnet, 54a ... Fixed bracket, 54b ... Fixed bracket, 54c ... Fixed bracket, 55 ... Anti-vibration rubber , 58 ... Magnetic detection element, 59 ... Rotational position detection unit, 60 ... Rotational position detection unit, 61 ... Magnetic detection element, 62 ... Controller board, 63 ... Cover, 64 ... Connector, 64a ... Terminal, 65 ... Power module, 70 ... Gripping tool, 70a ... Gripping claw, 90 ... Rotor assembly

Claims (5)

With the rotor
A worm deceleration mechanism connected to the rotor and
A gear case that houses the worm reduction mechanism inside, and
With
The rotor
The axis of rotation and
The rotor core attached to the rotating shaft and
With
The rotor core
A through hole that is formed through in the axial direction and can be fitted with the rotating shaft,
A plurality of openings formed on at least one end surface of both end faces in the axial direction opposite to the worm deceleration mechanism and communicating with the through hole.
Have,
The worm deceleration mechanism has a worm shaft integrated with the rotation shaft.
A method for manufacturing a motor with a speed reducer, wherein bearings for rotatably supporting the worm shaft and the rotating shaft are provided only at both ends of the worm shaft.
Assembly in which the rotor core and the bearing are assembled to the rotating shaft, and the rotor assembly is assembled so that the end face of the rotor core having the opening formed is located at one end of the rotating shaft opposite to the worm shaft. Process and
After the assembly step, a gripping step of inserting the gripping claw of the gripping tool from the opening of the one end surface of the rotor assembly and gripping the one end of the rotating shaft by the gripping claw.
After the gripping step, an assembly step of inserting and assembling the rotor assembly into the gear case while gripping the one end of the rotating shaft.
A method for manufacturing a motor with a speed reducer, which comprises. Prior to the assembly step, a tapered portion is formed by flattening the peripheral edge of one end of the rotating shaft so as to be tapered.
In the assembly process,
The method for manufacturing a motor with a speed reducer according to claim 1, wherein the rotor core is press-fitted from one end of the rotating shaft. In the assembly process,
The tapered portion is projected from the end face of the rotor core,
When the axial length of the tapered portion is L2 and the length from the base end of the tapered portion to the end face of the rotor core is L3, L3 is
0 mm ≤ L3 ≤ L2
The method for manufacturing a motor with a speed reducer according to claim 2, wherein the method satisfies the above. In the assembly step, the rotor core is subjected to the rotor core so that the protruding length dimension from the one end surface of the rotor core to the tip of the rotating shaft is smaller than the length dimension of the bearing along the axial direction of the rotating shaft. The method for manufacturing a motor with a speed reducer according to any one of claims 1 to 3, wherein the rotary shaft is press-fitted. The through hole is formed in a regular polygon whose number of squares is a multiple of 6.
Three openings are provided for each one end surface of the rotor core, and the same number of vertices of the regular polygon are arranged between the openings adjacent to each other in the circumferential direction in the circumferential direction. The method for manufacturing a motor with a speed reducer according to any one of claims 1 to 3, wherein the motors are arranged at equal intervals.

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