JP6662213B2 - Rotary motor and method of assembling rotary motor - Google Patents

Description

  The present invention relates to a rotary electric motor and a method for assembling the rotary electric motor.

Patent Literature 1 discloses a movable distance of an armature in a thrust direction, that is, a gap between surfaces of an armature and a magnetic pole surface of a magnetic pole body during braking of a spring-closed magnetic brake, or a plate body when a magnetic brake is not braked. Also disclosed is a motor (rotary motor) with a built-in magnetic brake in which the gap between the friction surfaces of the armature is adapted to a desired braking characteristic.
Further, in Patent Document 1, a C-ring as a bearing fixing means is fitted and positioned in an annular groove formed in an inner peripheral surface of a magnetic pole body and an annular groove formed in a connecting portion of a plate. It is disclosed that the plate and the magnetic pole body are integrally fixed so as to maintain the relative position of the plate and the magnetic body in the thrust direction.
The bearing is a bearing composed of an inner race, an outer race arranged on the outer race of the inner race, and a ball arranged between the inner race and the outer race.

In the rotary electric motor having the above-described configuration, when the excitation coil is not energized, the coil spring presses the armature against the plate body, the friction surfaces of the two are pressed, and a braking action is given to the rotation of the shaft to be braked.
When the excitation coil is energized, the armature separates from the plate body and is attracted to the magnetic pole surface of the magnetic pole body, and the braking action is released.

  Conventionally, in the rotary electric motor having the above-described configuration, a pressurizing is applied to the outer ring via a web washer (also referred to as a “wave washer”) for the purpose of suppressing backlash of the bearing as a motor bearing structure. Has been done.

JP-A-2002-5205

  However, in the rotary electric motor having the above-described web washer, since the web washer is incorporated in the motor, when assembling the brake to the motor, it is difficult to incorporate the web washer, and the assembled state of the web washer was checked. There was a problem that it was difficult to do.

  Therefore, the present invention provides a rotary electric motor and a method for assembling a rotary electric motor that can easily incorporate the web washer while checking the assembled state of the web washer.

In order to solve the above problems, according to one aspect of the present invention, a bearing housing that is disposed so as to surround an outer peripheral surface of a shaft and has a ring-shaped through hole with the shaft, And a bearing fitted to the shaft and the bearing housing, and a web washer arranged in the through-hole so as to be in contact with a part of the bearing and the bearing housing, The bearing housing is in contact with a first housing portion that contacts an outer peripheral surface of the bearing and the web washer, and is separable from the first housing portion in a direction in which the shaft extends. viewed including a second housing portion, said second housing portion, a rotary motor which comprises a magnetic brake mechanism is provided.

According to one aspect of the present invention, the bearing housing is in contact with the first housing portion in contact with the outer peripheral portion of the bearing, the web washer is abutted, and the bearing housing is separated from the first housing portion in the extending direction of the shaft. With the possible second housing part, it is possible to assemble the rotary electric motor while checking the installation state of the web washer.
Thereby, the web washer can be easily incorporated while checking the assembled state of the web washer.
In addition, since the second housing portion includes the magnetic brake mechanism, it can be applied to an electric motor with a magnetic brake.

  The rotary electric motor further includes a hub fixed to the shaft, wherein the magnetic brake mechanism includes a coil, an armature opposed to the coil, and an opposite side of the armature with respect to the coil. And a disk member that is integrally rotatably assembled. The armature presses the disk member against the coil against the second housing portion when the coil is not energized, thereby rotating the shaft. When the coil is energized, the armature is attracted to the coil to permit rotation of the shaft, and between the hub and the armature of the magnetic brake mechanism, A gap may be formed.

  As described above, the gap is formed between the hub and the armature, so that the magnetic brake mechanism can function.

  In the rotary electric motor, the second housing may be a plate-like member.

  As described above, by using a plate-shaped member as the second housing portion, the configuration of the second housing portion can be simplified, so that the cost of the second housing portion can be reduced. .

  In the rotary electric motor, a projection protruding in a direction toward the second housing portion is provided on a surface of the first housing portion that comes into contact with the second housing portion, and is in contact with the first housing portion. A concave portion for accommodating the convex portion may be provided on a surface of the second housing portion.

  By having the convex and concave portions configured as described above, a gap can be easily formed between the hub and the armature without using a jig.

  The method for assembling the rotary electric motor, wherein a first step of assembling the shaft, the bearing, and the first housing portion; and forming the through-hole exposed from the bearing into a part of the bearing. A second step of installing the web washer so as to be abutted, and inserting the second housing part into the shaft so as to be abutted on the web washer; A third step of abutting against a surface of the housing part, a fourth step of inserting a hub into the shaft so as to engage with the second housing part, and fixing the hub to the shaft; After the step, the second housing portion is rotated with respect to the first housing portion, and the convex portion is accommodated in the concave portion, thereby forming the gap between the hub and the armature. 5 steps Wherein after the fifth step, a sixth step of fixing the second housing portion relative to said first housing portion may have.

  By performing the first to sixth steps described above, the web washer can be easily incorporated while confirming the assembled state of the web washer, and the gap between the hub and the armature can be easily obtained without using a jig. Can be easily formed.

  According to the present invention, it is possible to easily incorporate the web washer while checking the assembled state of the web washer.

FIG. 1 is a perspective view of a rotary electric motor according to a first embodiment of the present invention. FIG. 2 is a sectional view of the rotary electric motor shown in FIG. 1 taken along the line AA. FIG. 3 is an enlarged sectional view of a part of the rotary electric motor shown in FIG. 2. FIG. 2 is a perspective view schematically showing a state where a first case constituting a second housing portion of a bearing housing is removed from the rotary electric motor shown in FIG. 1. It is sectional drawing (the 1) for demonstrating the assembling method of the rotary electric motor which concerns on 1st Embodiment of this invention. It is sectional drawing (the 2) for demonstrating the assembling method of the rotary electric motor which concerns on 1st Embodiment of this invention. It is sectional drawing (the 3) for demonstrating the assembling method of the rotary electric motor which concerns on 1st Embodiment of this invention. FIG. 6 is a perspective view of a rotary electric motor according to a second embodiment of the present invention. FIG. 9 is an enlarged view of a part of a cross-sectional view taken along a line BB of the rotary electric motor shown in FIG. 8.

  Hereinafter, embodiments to which the present invention is applied will be described in detail with reference to the drawings. The drawings used in the following description are for explaining the configuration of the embodiment of the present invention, and the sizes, thicknesses, dimensions, etc. of the respective parts shown in the drawings are different from the actual dimensional relationships of the rotary motor. There is.

(First embodiment)
FIG. 1 is a perspective view of a rotary electric motor according to a first embodiment of the present invention.
In FIG. 1, CL indicates the axis of the shaft 41 of the rotor 13 (hereinafter, referred to as “axis CL”), and the X direction indicates the direction in which the shaft 41 extends.
Hereinafter, a direction along the axis CL is referred to as a “rotor axial direction”, a direction orthogonal to the axis CL is referred to as a “rotor radial direction”, and a direction rotating around the axis CL is referred to as a “rotor circumferential direction”.
FIG. 2 is a sectional view of the rotary electric motor shown in FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals.

  Referring to FIGS. 1 and 2, a rotary electric motor 10 according to a first embodiment includes a case body 12, a rotor 13, a stator 14, a holder 15, a sensor magnet 16, a circuit board 17, a harness 19, a magnetic sensor 21, a first bearing 23, a printed circuit board 24, a plurality of coils 25 wound in the rotor axial direction, a bearing housing 28, a second bearing 31, and a web washer 32. , A hub 33 and a fixing screw 34.

  The case body 12 includes a bracket 35 that covers the rear end side of the rotor 13, a cylindrical stator case 36 that covers the outside in the rotor radial direction, and a magnetic sensor cover 37 that covers the magnetic sensor 21.

The bracket 35 is an annular member, and has a position restricting portion 35A and an annular space 35B.
The position restricting portion 35A is provided at the center of the bracket 35, and is in contact with the outer ring 23B of the first bearing 23 (for example, a bearing). The position restricting portion 35A restricts the position of the first bearing 23 in the rotor axis direction.
The annular space 35B is a space provided outside the position restricting portion 35A, and houses the printed circuit board 24.

  The stator case 36 is an annular member, and is arranged outside the stator 14. One end of the stator case 36 is supported by the bracket 35, and the other end is supported by the bearing housing 28.

  The magnetic sensor cover 37 is provided so as to cover one side of the magnetic sensor 21 in the rotor axis direction. The magnetic sensor cover 37 defines a disc-shaped space 37A between the magnetic sensor cover 37 and the bracket 35. The circuit board 17 on which the magnetic sensor 21 is mounted is accommodated in the space 37A.

The rotor 13 has a shaft 41, a rotor core 42, and a rotor magnet 43.
The shaft 41 extends in the X direction, and passes through the bearing housing 28, the second bearing 31, and the hub 33. The shaft 41 is rotatably supported by first and second bearings 23 and 31 that are spaced apart in the rotor axis direction.
The shaft 41 has a flange portion 41A that regulates the position of the second bearing 31 in the rotor axis direction, and an annular step portion 41B that regulates the position of the first bearing 23 in the rotor axis direction together with the holder 15. .

The rotor core 42 is a metal annular member fixed outside of the shaft 41 located between the first bearing 23 and the second bearing 31 so as to be in contact with the flange portion 41A. Therefore, the rotor core 42 and the second bearing 31 are assembled at positions adjacent to each other with the flange portion 41A interposed therebetween.
The rotor magnet 43 is an annular magnet member fixed outside the rotor core 42. The rotor core 42 and the rotor magnet 43 are arranged inside the stator via a gap.

  The stator 14 is fixed integrally with the stator case 36, and is arranged with the rotor magnet 43 via a gap. The stator 14 has teeth portions 14A formed at regular intervals in the circumferential direction. Insulators 26A and 26B are attached to the teeth portion 14A from the rotor axis direction of the stator 14, and a coil 25 is wound so as to cover the insulators 26A and 26B.

The holder 15 is formed in a cylindrical shape, and is provided so that one end side covers the rear end of the shaft 41. The sensor magnet 16 is supported on the other end of the holder 15. The sensor magnet 16 is arranged so as to face the rear end of the shaft 41.
The holder 15 and the sensor magnet 16 are fixed to the shaft 41 and rotate integrally with the shaft 41.

The circuit board 17 has a disk shape and is disposed in the space 37A. The circuit board 17 is connected to an external power supply (not shown) via a harness 19.
The magnetic sensor 21 is provided on the circuit board 17 at a position facing the sensor magnet 16.
The magnetic sensor 21 detects the rotation angle of the shaft 41. The magnetic sensor 21 detects the rotation angle of the shaft 41 by detecting a change in the magnetic field of the sensor magnet 16 due to the rotation of the shaft 41. As the magnetic sensor 21, for example, a Hall IC can be used.

The first bearing 23 has an inner ring 23A, an outer ring 23B, and a ball 23C. The shaft 41 is press-fitted and fixed to the inner peripheral surface of the inner race 23 </ b> A, and one end in the rotor axial direction is in contact with the step portion 41 </ b> B, and the other end is in contact with the holder 15.
The outer peripheral surface of the outer ring 23B is press-fitted and fixed to the bracket 35, and the other end of the outer ring 23B in the rotor axial direction is in contact with the position regulating portion 35A of the bracket 35. A plurality of balls 23C are arranged between the inner ring 23A and the outer ring 23B.

  The printed board 24 is a ring-shaped board, and is disposed in the annular space 35B.

FIG. 3 is an enlarged sectional view of a part of the rotary electric motor shown in FIG. 3, the same components as those of the structure shown in FIG. 2 are denoted by the same reference numerals.
FIG. 4 is a perspective view schematically showing a state where a first case forming a second housing portion of the bearing housing is removed from the rotary electric motor shown in FIG. In FIG. 4, illustration of the coil 52 provided in the first case 51 is omitted. 4, the same components as those of the structure shown in FIGS. 1 to 3 are denoted by the same reference numerals.

Referring to FIGS. 2 to 4, the bearing housing 28 is in contact with the first housing portion 46 that comes into contact with the outer peripheral portion of the second bearing 31 and the web washer 32, and is in the X direction (of the shaft 41). A second housing portion 47 that is separable from the first housing portion 46 in the extending direction).
The first housing part 46 is an annular bracket, and one end is connected to the stator case 36. The first housing part 46 is a ring-shaped member arranged at a position separated from the outer periphery of the shaft 41.
The first housing portion 46 has a through hole 46A that penetrates in the rotor axial direction in a state where the first housing portion 46 is assembled with the stator case 36. The second bearing 31 is press-fitted and fixed to the inner wall of the through hole 46A, and a web washer 32 is disposed at one axial end of the second bearing 31.

The first housing part 46 is arranged between the stator 14 and the second housing part 47 in the X direction. The first housing part 46 has a surface 46a that contacts the second housing part 47. The surface 46a is a surface orthogonal to the rotor axis direction.
The first housing part 46 has a plurality of protrusions 46B (three as an example in FIG. 4) protruding in a direction from the surface 46a toward the second housing part 47. The plurality of convex portions 46B are arranged in the circumferential direction of the first housing portion 46.
The protruding surface 46Ba of the projection 46B is a plane orthogonal to the rotor axis direction. The projecting amount of the convex portion 46B (the distance from the surface 46a to the projecting surface 46Ba) with respect to the surface 46a is equal to the width in the X direction of the gap 60 formed between the armature 57 and the hub 33. Is configured.

The second housing part 47 includes a magnetic brake mechanism, and includes a first case 51, a coil 52, a screw 54, a second case 56, an armature 57, a disk member 58, A spring member.
As described above, since the second housing portion 47 includes the magnetic brake mechanism, the rotary electric motor 10 can be applied to an electric motor with a magnetic brake.

  The first case 51 is an annular member having a through hole formed at the center thereof, through which the shaft 41 can be inserted. The first case 51 is in contact with the surface 46 a of the first housing portion 46 from the rotor axial direction. The first case 51 has a surface 51a in contact with the surface 46a of the first housing portion 46, and a plurality of concave portions provided on the surface 51a side of the first case 51 and having a depth capable of accommodating the convex portion 46B. 51A (in the case of FIG. 4, for example, three) and a surface 51b provided on the opposite side of the surface 51a, and an annular coil housing for housing the coil 52 is provided on the surface 51b side. A part is formed.

  When the first case 51 is rotated with respect to the first housing portion 46, the plurality of recesses 51A are located at positions at which the plurality of protrusions 46B can be accommodated and at positions at which the plurality of protrusions 46B cannot be accommodated. And a position.

  Note that the number of the plurality of convex portions 46B and the number of concave portions 51A may be a plurality, and are not limited to three shown in FIG. 2 and 3, as an example, the case where the shape of the convex portion 46B and the concave portion 51A is circular is illustrated, but the shape of the concave portion 51A is a shape that can accommodate the convex portion 46B. The shape is not limited to a circular shape. Further, the shape of the convex portion 46B is not limited to a circular shape.

  The coil 52 is housed in the coil housing portion of the first case 51, and one surface 52 a is exposed from the surface 51 b of the first case 51. One surface 52a is flush with surface 51b. One surface 52a of the coil 52 is disposed so as to face the armature 57 in the rotor axial direction.

  The first case 51 is fixed to the first housing part 46 by a plurality of screws 54. The plurality of screws 54 are arranged in the circumferential direction of the first housing portion 46 and the first case 51.

  The second case 56 is fixed to the first case 51 by a plurality of screws 59. The second case 56 is an annular member having a through hole formed in the center, and one end surface thereof is disposed in contact with the surface 51 b of the first case 51. On the other end surface side of the second case 56, a flange portion 56A protruding toward the inner diameter side of the through hole is formed. Then, in a state where the first case 51 and the second case 56 are assembled, a spring member (not shown) is provided between the coil 52 housed in the first case 51 and the flange portion 56A of the second case 56. , Armature 57 and disk member 58 are arranged in this order.

The armature 57 is a ferromagnetic material and has an annular shape having a through hole formed at the center thereof, through which the shaft 41 can be inserted. The armature 57 is arranged radially inward of the second case 56, and is arranged such that one surface 57 a faces the one surface 52 a of the coil 52.
Further, the disc member 58 is formed with a through hole in the center capable of transmitting the rotational force to the hub 33, and the disc member 58 and the hub 33 are integrally formed by engaging the through hole and the hub 33. Rotate. The through-hole has, for example, a polygonal shape as a shape capable of transmitting the rotational force.
The hub 33 is provided so as to contact the outer peripheral surface of the shaft 41. A part of the hub 33 is accommodated in the disk member 58, and the remaining part protrudes from the disk member 58 toward the distal end of the shaft 41. The hub 33 has a screw hole 33 </ b> A reaching the outer peripheral side surface of the shaft 41.
The fixing screw 34 fixes the hub 33 to the shaft 41 by being screwed into the screw hole 33A.

As shown in FIGS. 2 and 3, the outer diameter of the hub 33 is set to be larger than the inner diameter of the armature 57, and the hub 33 and the armature 57 overlap in the rotor axial direction via the gap 60. .
Next, the operation of the magnetic brake mechanism will be described.
When the coil 52 is not energized, a spring member (not shown) presses the armature 57 and the disk member 58 in a direction away from the coil 52. The disk member 58 is pressed against the flange portion 56A of the second case 56 by the spring force of the spring member. The hub 33 attached to the shaft 41 rotates integrally with the disk member 58. Therefore, the rotation of the shaft 41 is restricted by the frictional force generated between the disk member 58 and the flange portion 56A when the coil 52 is not energized.

The gap 60 prevents the shaft 41 from shifting in the thrust direction by applying a force in the X direction to the shaft 41 via the hub 33 by the armature 57 by a spring force of a spring member (not shown). .
When the coil 52 is energized, the armature 57 is attracted to the coil 52 against the spring force of a spring member (not shown). Therefore, the disk member 58 becomes rotatable with respect to the flange portion 56A, so that the shaft 41 can rotate together with the hub 33 and the disk member 58 when the coil 52 is energized. Thus, the magnetic brake mechanism regulates the rotation of the shaft 41 by switching between energization and non-energization of the coil 52.

The second bearing 31 is a bearing larger than the first bearing 23, and is disposed in the through hole 46A. The second bearing 31 is fitted on the shaft 41 and the bearing housing 28.
The second bearing 31 has an inner ring 31A, an outer ring 31B, and a ball 31C.
The inner ring 31A is in contact with the outer peripheral surface of the shaft 41 in a state where one corner portion is in contact with the flange portion 41A. The outer ring 31B is arranged outside the inner ring 31A, and the outer peripheral surface is in contact with the inner peripheral surface of the first housing portion 46.
A plurality of balls 31C are arranged between the inner race 31A and the outer race 31B.

  The web washer 32 is disposed in a through hole 46A located between the second bearing 31 and the first case 51. The web washer 32 has a curved shape waving along the circumferential direction of the rotor. The web washer 32 is in contact with the outer ring 31B.

According to the rotary electric motor 10 of the first embodiment, the bearing housing 28 is in contact with the first housing portion 46 that comes into contact with the outer peripheral surface of the second bearing 31 and the web washer 32, and the shaft 41 extends. And the second housing part 47 which can be separated from the first housing part 46 in the direction, so that the rotary motor 10 can be assembled while confirming the installation state of the web washer 32. Become.
Accordingly, the web washer 32 can be easily incorporated while checking the assembled state of the web washer 32.

  5 to 7 are cross-sectional views illustrating a method of assembling the rotary electric motor according to the first embodiment of the present invention. 5 to 7, the same components as those of the structure shown in FIGS. 1 to 4 are denoted by the same reference numerals.

Next, a method of assembling the rotary electric motor 10 according to the first embodiment will be described with reference to FIGS.
First, as shown in FIG. 5, the shaft 41, the second bearing 31, and the first housing part 46 are assembled (first step).
At this time, one corner of the inner ring 31 </ b> A constituting the second bearing 31 is brought into contact with the flange 41 </ b> A of the shaft 41. At this stage, the second bearing 31 is disposed in the through hole 46A.

Next, a part of the second bearing 31 (in FIG. 5, as an example, the outer ring 31 </ b> B) is brought into contact with the through hole 46 </ b> A exposed from the second bearing 31 and located at the tip end side of the shaft 41. Thus, the web washer 32 is installed (second step).
At this time, the operator can install the web washer 32 while watching the position of the web washer 32 in the through hole 46A.

  Next, as shown in FIG. 6, the second housing part 47 was inserted into the shaft 41 so as to be in contact with the web washer 32 accommodated in the through hole 46 </ b> A, and provided on the first housing part 46. The protruding surfaces 46Ba of the plurality of convex portions 46B are brought into contact with the surface 51a constituting the second housing portion 47 (third step).

Next, the hub 33 is inserted into the shaft 41 so as to be engaged with the second case 56 constituting the second housing portion, and a fixing screw is screwed into the screw hole 33A. Fix (fourth step).
At this stage, since the armature 57 and the hub 33 are in contact with each other in the rotor axial direction, the gap 60 shown in FIG. 3 is not formed between the armature 57 and the hub 33.

Next, in the step shown in FIG. 7, the second housing portion 47 is rotated with respect to the first housing portion 46, and the convex portions 46B are accommodated in the plurality of concave portions 51A, whereby the hub 33 and the armature 57 A gap 60 is formed therebetween (fifth step).
Thereafter, the second housing part 47 is fixed to the first housing part 46 by using a plurality of screws 54 (sixth step).
Thereby, the assembly of the rotary electric motor 10 of the first embodiment is completed.

  According to the method for assembling the rotary electric motor 10 of the first embodiment, by performing the above-described first to sixth steps, it is possible to easily assemble the web washer 32 while confirming the assembled state of the web washer 32. Can be. Further, the gap 60 can be easily formed between the hub 33 and the armature 57 without using a jig.

(Second embodiment)
FIG. 8 is a perspective view of a rotary electric motor according to a second embodiment of the present invention. 8, the same components as those of the rotary electric motor 10 according to the first embodiment shown in FIG. 1 are denoted by the same reference numerals.
FIG. 9 is an enlarged view of a part of the cross-sectional view taken along the line BB of the rotary electric motor shown in FIG. 9, the same components as those of the structure shown in FIGS. 3 and 8 are denoted by the same reference numerals.

  Referring to FIGS. 8 and 9, the rotary electric motor 70 according to the second embodiment has the same structure as the rotary electric motor 10 according to the first embodiment except that a bearing housing 71 is used instead of the bearing housing 28. It is configured similarly to the electric motor 10.

The bearing housing 71 has the same configuration as that of the bearing housing 28 except that the bearing housing 71 has a second housing portion 72 instead of the second housing portion 47 forming the bearing housing 28.
The second housing portion 72 is a ring-shaped plate-like member, and is fixed to the first housing portion 46 by a plurality of screws 74 in a state where the shaft 41 is inserted into a through hole 72A formed in the center. Fixed.

In the rotary electric motor 70 according to the second embodiment having the above configuration, the configuration of the second housing portion 72 can be simplified by using a plate-shaped member as the second housing portion 72. The cost of the second housing portion 72 can be reduced.
Also, in the rotary electric motor 70 of the second embodiment, the web washer 32 can be easily incorporated while confirming the assembled state of the web washer 32.

  As described above, the preferred embodiments of the present invention have been described in detail, but the present invention is not limited to such specific embodiments, and various modifications may be made within the scope of the present invention described in the claims. Deformation and modification are possible.

  Reference numerals 10, 70: rotary motor, 12: case body, 13: rotor, 14: stator, 14A: teeth portion, 15: holder, 16: sensor magnet, 17: circuit board, 19: harness, 21: magnetic sensor, 23 ... 1st bearing, 23A, 31A ... inner ring, 23B, 31B ... outer ring, 23C, 31C ... ball, 24 ... printed circuit board, 25, 52 ... coil, 26A, 26B ... insulator, 28, 71 ... bearing housing, 31 ... first 2, a bearing 32, a web washer 33, a hub 33A, a screw hole 34, a fixing screw 35, a bracket 35A, a position restricting portion 35B, an annular space 36, a stator case 37, a magnetic sensor cover 37A ... space, 41 ... shaft, 41A, 56A ... flange part, 41B ... step part, 42 ... rotor core, 43 ... rotor magnet 46: first housing part, 46a, 51a, 51b ... surface, 46A ... through hole, 46B ... convex part, 46Ba ... protruding surface, 47, 72 ... second housing part, 51 ... first case, 51A ... Recesses, 52a, 57a: one surface, 54, 59, 74: screw, 56: second case, 57: armature, 60: gap, 72A: through hole, CL: axis

Claims (5)

A bearing housing arranged to surround the outer peripheral surface of the shaft and having a ring-shaped through hole with the shaft;
A bearing arranged in the through hole and fitted to the shaft and the bearing housing;
A web washer disposed in the through hole so as to abut on a part of the bearing and the bearing housing;
With
The bearing housing is in contact with a first housing portion that contacts an outer peripheral surface of the bearing and the web washer, and is separable from the first housing portion in a direction in which the shaft extends. A second housing part;
Only including,
The rotary motor according to claim 2, wherein the second housing part includes a magnetic brake mechanism . A hub fixed to the shaft,
The magnetic brake mechanism includes a coil, an armature disposed to face the coil, and a disk member disposed on a side opposite to the coil with the armature interposed therebetween and assembled integrally with the hub so as to be integrally rotatable. When the coil is not energized, the armature presses the disc member against the coil against the second housing portion to regulate the rotation of the shaft, and when energized to the coil, the armature is Which is allowed to rotate the shaft by being attracted to the coil,
Wherein between the hub and the armature of the magnetic brake mechanism, the rotary motor according to claim 1, wherein a gap is formed.   The rotary electric motor according to claim 1, wherein the second housing part is a plate-shaped member. A convex portion protruding in a direction toward the second housing portion is provided on a surface of the first housing portion in contact with the second housing portion;
The rotation according to any one of claims 1 to 3 , wherein a concave portion that accommodates the convex portion is provided on a surface of the second housing portion that is in contact with the first housing portion. Electric motor. A method for assembling a rotary electric motor according to claim 4 ,
A first step of assembling the shaft, the bearing, and the first housing portion;
A second step of installing the web washer so that the through hole exposed from the bearing is in contact with a part of the bearing;
A third step of inserting the second housing portion into the shaft so as to be in contact with the web washer, and contacting the convex portion with a surface of the second housing portion;
A fourth step of inserting a hub into the shaft and engaging the hub with the shaft to engage the second housing portion;
After the fourth step, the second housing portion is rotated with respect to the first housing portion, and the convex portion is accommodated in the concave portion, so that the gap is formed between the hub and the armature. A fifth step of forming;
A sixth step of fixing the second housing part to the first housing part after the fifth step;
A method for assembling a rotary electric motor, comprising:

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