JP2015216707A - Motor and manufacturing method for motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor ensuring accuracy in its positioning with respect to a load-side device, and to provide a manufacturing method for a motor.SOLUTION: One end 24 of a bearing holder 23 is fitted on a mounting hole 6 provided in the center of the bottom part 5 of a motor housing 2. Additionally, each projecting part 7 corresponding to the motor housing 2 is held by each of the holding parts 30 of the bearing holder 23. Thus, unlike a conventional motor, when the motor is attached to another device, a welded trace is prevented from interfering with inlay coupling with another device, which may be caused by the hook part of a housing (bearing holder), which hook part is welded to the bottom part of a cover (motor housing). Accordingly, accuracy in positioning the motor with respect to another device can be improved.

Description

  The present invention relates to a motor and a method for manufacturing the motor.

  For example, Patent Document 1 discloses an inner rotor type brushless motor (hereinafter simply referred to as “motor”) in which a stator core is disposed on the outer periphery of a cylindrical permanent magnet. By the way, Patent Document 1 describes that a flange portion of a housing (bearing holder) that integrally holds a pair of bearings is joined (welded) to a bottom surface portion of a cover (motor housing). However, when the flange of this motor housing (bearing holder) is fitted into the mounting hole of another device, the welding trace interferes with the other device and hinders the inlay, and the positioning accuracy of the motor with respect to the load side device May decrease. Further, when the housing is welded to the cover, it is difficult to ensure the coaxiality between the housing and the cover, and thus the coaxiality between the rotor and the stator. Further, when the housing and the cover are made of different materials, welding itself is difficult.

JP 2006-109575 A

  Therefore, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a motor and a motor manufacturing method that can ensure positioning accuracy with respect to a load side device.

  In order to solve the above-described problems, a motor according to the present invention includes a rotor shaft, a pair of bearings that support the rotor shaft, and a substantially cylindrical shape, with the pair of bearings spaced apart in the axial direction. A motor comprising: a bearing holder to hold; and a motor housing formed in a substantially bottomed cylindrical shape, wherein the motor housing is provided at the center of the bottom and is attached to one end in the axial direction of the bearing holder And a plurality of protrusions provided on the periphery of the mounting hole and extending along the axial direction, wherein the bearing holder is provided on the outer periphery on one end side in the axial direction and is provided from the bottom of the motor housing. Each protrusion having a flange portion disposed at a certain interval toward the other end in the axial direction, and a plurality of holding portions provided on the flange portion and disposed corresponding to the protrusion portions. Parts are supported by the corresponding holding parts. So as to be held, characterized in that it is assembled to the motor housing.

  Further, the motor of the present invention includes a rotor shaft, a pair of bearings that support the rotor shaft, a bearing holder that is formed in a substantially cylindrical shape and holds the pair of bearings at a certain interval in the axial direction, A motor housing formed in a substantially bottomed cylindrical shape, wherein the motor housing is provided at the center of the bottom portion and is attached to one end in the axial direction of the bearing holder; and A boss provided on the periphery and extending inward along the axis, and the bearing holder is provided on an outer periphery on one end in the axial direction and is fixed from the bottom of the motor housing to the other end in the axial direction. It has a collar part arranged at intervals, and it is assembled to the motor housing so that the collar part may contact the tip of the boss.

  In order to solve the above-described problems, a method of manufacturing a motor according to the present invention includes a rotor shaft, a pair of bearings that support the rotor shaft, and a substantially cylindrical shape, and the pair of bearings are spaced apart in the axial direction. A motor manufacturing method, comprising: a bearing holder that holds an opening; and a motor housing formed in a substantially bottomed cylindrical shape, wherein the motor housing has a mounting hole provided in the center of the bottom, and the mounting hole And a plurality of protrusions extending along the axial direction, and the bearing holder is provided on the outer periphery of one end side in the axial direction and is connected to the other end in the axial direction from the bottom of the motor housing. A flange portion arranged at a certain interval to the side, a plurality of holding portions provided on the flange portion and arranged corresponding to the plurality of protrusions, and provided on each holding portion. Each protruding part is inserted Including a step of forming an insertion hole, a step of inserting each protruding portion into an insertion hole of a corresponding holding portion, and a step of caulking each holding portion to the inside in the radial direction of the bearing holder. And

  The motor manufacturing method of the present invention includes a rotor shaft, a pair of bearings that support the rotor shaft, and a bearing that is formed in a substantially cylindrical shape and holds the pair of bearings at a certain interval in the axial direction. A motor manufacturing method comprising: a holder; and a motor housing formed in a substantially bottomed cylindrical shape, wherein the motor housing is provided with a mounting hole provided at a center of a bottom portion and a peripheral edge of the mounting hole. A boss extending inwardly along the axis, and a fixed distance from the bottom of the motor housing to the other end in the axial direction provided on the bearing holder on the outer periphery on one end in the axial direction. A step of forming a flange portion to be disposed; a step of inserting one axial end of the bearing holder into the boss portion of the motor housing; and a step of bringing the flange portion of the bearing holder into contact with the tip of the boss. Characterized in that it comprises Tsu and up, the.

  According to the present invention, it is possible to ensure high positioning accuracy of the motor with respect to the load side device.

It is sectional drawing by the axial plane of the motor which concerns on 1st Embodiment. It is explanatory drawing of the motor which concerns on 1st Embodiment, Comprising: It is a disassembled perspective view of a motor housing and a bearing holder. It is explanatory drawing of the motor which concerns on 1st Embodiment, Comprising: It is sectional drawing by an axial plane which shows the state by which each protrusion part of the motor housing was penetrated by the insertion hole of each holding | maintenance part of a bearing holder. It is explanatory drawing of the motor which concerns on 1st Embodiment, Comprising: It is a perspective view which shows the state by which the protrusion part of the motor housing was penetrated by the penetration hole of the holding | maintenance part of a bearing holder. It is explanatory drawing of the motor which concerns on 2nd Embodiment, Comprising: It is a disassembled perspective view of a motor housing and a bearing holder. It is explanatory drawing of the motor which concerns on 2nd Embodiment, Comprising: It is a perspective view which shows the state by which the end of the bearing holder was fitted by the boss | hub part of the motor housing. It is a figure which shows the state by which the latching | locking part was formed in the front-end | tip of each protrusion part from the state shown by FIG.

(First embodiment)
A first embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, a motor 1 to which the first embodiment of the present invention is applied is an inner rotor type brushless motor, which is a motor housing 2, a stator 3, and a rotor disposed on the inner periphery of the stator 3. 4 is included.

  The motor housing 2 is formed into a substantially bottomed cylindrical shape by press molding. An attachment hole 6 for attaching the rotor 4 is provided in the center of the bottom 5 of the motor housing 2. As shown in FIG. 2, the motor housing 2 includes a plurality of protrusions 7 (six in the first embodiment) that are provided at equal intervals around the mounting hole 6 and have a rectangular cross section. Each projecting portion 7 is formed by cutting and raising the bottom portion 5 of the motor housing 2 with a press die, and extends along the axis L1 of the motor housing 2, and then along the axis L1 of the motor 1 (in the vertical direction in FIG. 1). ) Extends inward (upper side in FIG. 1). In addition, the code | symbol 8 in FIG. 2 is a screw hole used when attaching to another apparatus.

  As shown in FIG. 1, the stator 3 includes a stator core 10 formed by laminating electromagnetic steel plates and attached with an insulator 9, and a stator coil 11 wound around the stator core 10. The stator 3 is fixed to the motor housing 2 by fitting an outer peripheral surface of the stator core 10 to a stator fitting portion 12 formed on the inner peripheral surface 2A of the motor housing 2 and further joining (adhering). The inner diameter of the stator fitting portion 12 is set larger than the inner diameter of the inner peripheral surface 2A of the motor housing 2. Thereby, the stator 3 is configured such that the outer peripheral edge of one end (the lower end in FIG. 1) of the stator core 10 is brought into contact with the stepped portion 13 that separates the inner peripheral surface 2A of the motor housing 2 and the stator fitting portion 12. It is positioned with respect to the housing 2 in the axial direction (vertical direction in FIG. 1). The insulator 9 is made of an insulating material, and a control board 15 on which a Hall element 14 for position detection is arranged is fixed to the other end (upper end in FIG. 1).

  As shown in FIG. 1, the rotor 4 includes a rotor shaft 16, a rotor yoke 17 that is formed in a substantially bottomed cylindrical shape and has a mounting hole 19 for mounting the rotor shaft 16 at the center of the bottom portion 18, and the rotor yoke. And a cylindrical permanent magnet 20 fixed to the outer peripheral surface of 17. The rotor shaft 16 is supported by a pair of bearings 21 and 22 so as to be rotatable about the axis L1. The pair of bearings 21 and 22 are held by a bearing holder 23 formed in a substantially cylindrical shape. The bearing 21 is fitted into a bearing mounting hole 26 in which the outer ring 21 </ b> A is provided at one end 24 in the axial direction of the bearing holder 23 (hereinafter referred to as “one end 24”). The bearing 22 is fitted in a bearing mounting hole 27 in which the outer ring 22 </ b> A is provided at the other axial end 25 (hereinafter referred to as “other end 25”) of the bearing holder 23.

  The bearing mounting hole 27 is provided with a preload member 28 for applying a preload to the bearing 22. In addition, the pair of bearings 21 and 22 are held by the bearing holder 23 at a constant interval in the axial direction (vertical direction in FIG. 1). Furthermore, as can be understood from FIG. 1, the depth (axial length) of the bearing mounting hole 26 is set to be shallower (shorter) than the width of the bearing 21. As a result, one end (the lower end in FIG. 1) of the bearing 21 projects in the axial direction (downward in FIG. 1) from the end surface 24 </ b> A of the one end 24 of the bearing holder 23. The protruding portion of the outer ring 21A of the bearing 21 is used for in-lobe coupling with other devices.

  In the first embodiment, the bearing holder 23 is a molded product made of zinc alloy die casting or the like. As shown in FIG. 2, the bearing holder 23 has an annular flange 29 provided on the outer periphery on the one end 24 side (the lower side in FIG. 2). 3, the bearing holder 23 has a distance from the end surface 24A of one end 24 (hereinafter referred to as “one end surface 24A”) to the lower surface 29A of the flange 29 from the other end 25 side (upper side in FIG. 3), In other words, the distance from the outer surface 5A of the bottom 5 of the motor housing 2 to the lower surface 29A of the flange 29 is set to be equal to the plate thickness T1 of the bottom 5 of the motor housing 2, and this distance is the same as the motor housing 2 and the bearing holder. 23 and the fitting length. The bearing holder 23 is positioned in the axial direction with respect to the motor housing 2 by bringing the lower surface 29 </ b> A of the flange 29 into contact with the inner surface 5 </ b> B of the bottom 5 of the motor housing 2. The bearing holder 23 does not have to have its one end surface 24A located on the same plane as the outer surface 5A of the bottom 5 of the motor housing 2. For example, the one end surface 24A protrudes below the outer surface 5A in the figure. You may comprise as follows.

  Here, a portion of the bearing holder 23 that protrudes downward from the flange portion 29 in FIGS. 2 and 3 is one end 24, and a portion that protrudes upward from the flange portion 29 in FIGS. 2 and 3 is the other end 25. The bearing holder 23 is set such that the outer diameter D1 (see FIG. 3) of the one end 24 is larger than the outer diameter D2 of the other end 25. As a result, the area of the fitting portion between the motor housing 2 and the bearing holder 23 can be increased, which is advantageous in terms of improving the coupling force between the two, but the present invention is not limited to this configuration.

  As shown in FIG. 2, the bearing holder 23 has a plurality of (that is, six) holding portions 30 that are provided on the flange portion 29 and are arranged corresponding to the protrusions 7 of the motor housing 2. Each holding portion 30 is formed by projecting the flange portion 29 in the radial direction of the bearing holder 23. As shown in FIGS. 3 and 4, each holding portion 30 has an insertion hole 31 through which each corresponding protrusion 7 is inserted. Each insertion hole 31 is set such that the distance from the axis L1 is larger than the radius (D1 / 2) of the one end 24 of the bearing holder 23 by a certain distance. Each insertion hole 31 guides the inner side surface 7A of each protrusion 7 by the wall surface 31A arranged on the inner side (side closer to the axis L1) when each corresponding protrusion 7 is inserted, and the flange 29 Both end surfaces 7B of each protrusion 7 are guided by a pair of wall surfaces 31B arranged on both sides in the circumferential direction.

  As shown in FIG. 4, each holding portion 30 is provided on a wall surface 31 </ b> C disposed outside (through the side far from the axis L <b> 1) of the insertion hole 31, i.e., a wall surface 31 </ b> C facing the wall surface 31 </ b> A. Side). Each convex part 32 is formed in a substantially semicircular cross section by an axis perpendicular to the axis L1. In each holding portion 30, the distance between the wall surface 31 </ b> A and the convex portion 31 </ b> C is set to be equal to or greater than the plate thickness of each protruding portion 7, that is, the plate thickness T <b> 1 of the bottom portion 5 of the motor housing 2. In the first embodiment, the flange portion 29 is continuous in an annular shape, but may be a plurality of divided arc-shaped flange portions 29 provided at regular intervals in the circumferential direction.

Next, a method for manufacturing the motor 1 according to the first embodiment will be described. Here, a procedure for attaching the bearing holder 23 to the motor housing 2 will be described.
First, the corresponding protrusions 7 of the motor housing 2 are inserted into the insertion holes 31 of the holding portions 30 of the bearing holder 23 and one end 24 of the bearing holder 23 is fitted into the mounting hole 6 of the bottom 5 of the motor housing 2. Let Thereby, the bearing holder 23 is aligned with respect to the motor housing 2. Here, FIG. 3 shows a state where the insertion of each protrusion 7 into the corresponding insertion hole 31 is completed. In this state, the one end surface 24A of the bearing holder 23 and the outer surface 5A of the bottom 5 of the motor housing 2 are located on the same plane.

  Next, in the state shown in FIG. 3, each holding portion 30 of the bearing holder 23 is added in the radial direction inside the bearing holder 23 by a caulking jig (not shown), in other words, in the direction of the arrow A toward the axis L1. The caulking portion 33 (see FIG. 1) is formed in each holding portion 30 by pressing. Thereby, the convex part 32 of each holding | maintenance part 30 bites into each protrusion part 7 corresponding, and each protrusion part 7 corresponding to each holding part 30 is hold | maintained firmly.

  Next, the tip of each projecting part 7, that is, the part projecting from the insertion hole 31 of the holding part 30 is indicated by an arrow B toward the radially inner side of the bearing holder 23, that is, toward the axis L1 by a bending jig (not shown). Pressurize in the direction. Thereby, the front-end | tip of each protrusion part 7 is bent, and the latching | locking part 34 (refer FIG. 1) is formed. As a result, the locking portion 34 of each protrusion 7 is locked to the flange portion 29, and the bearing holder 23 is firmly fixed by the motor housing 2. In other words, the relative movement of the bearing holder 23 in the direction of the axis L1 with respect to the motor housing 2 is prevented.

The first embodiment has the following effects. In the following description, the reference numerals of conventional motor configurations are omitted.
According to the first embodiment, one end 24 of the bearing holder 23 is fitted into the mounting hole 6 provided in the center of the bottom portion 5 of the motor housing 2, and the holding portion 30 of the bearing holder 23 allows the motor housing 2 to be Each corresponding protrusion 7 is held, and the bearing holder 23 is attached to the motor housing 2.

  Conventionally, in an inner rotor type brushless motor in which the flange portion of the bearing holder is joined to the bottom portion of the motor housing by welding, when the motor is attached to another device, the welding traces hinder the inlay connection with the other device, and the motor However, in the first embodiment, since welding is not used for joining the bearing holder 23 and the motor housing 2, it is possible to avoid such a decrease in the positioning accuracy of the motor. . Moreover, in 1st Embodiment, the positioning accuracy with respect to the other apparatus of a motor can be improved more by mounting | wearing a motor with another apparatus using the inlay of the outer ring | wheel 21A of the bearing 21. FIG.

  In the first embodiment, the one end 24 of the bearing holder 23 is fitted into the mounting hole 6 of the motor housing 2, and the corresponding protrusions of the motor housing 2 are inserted into the insertion holes 31 of the holding portions 30 of the bearing holder 23. 7, the bearing holder 23 can be coaxially positioned with respect to the motor housing 2, and the motor housing 2 and the bearing holder 23 can be connected to the motor 1 alone without using a jig or the like. Thus, the coaxiality between the stator 3 and the rotor 4 can be ensured.

  Further, in the first embodiment, the coupling strength between the motor housing 2 and the bearing holder 23 is obtained by caulking the holding portions 30 of the bearing holder 23 and pressing the protrusions 32 against the corresponding protrusions 7 of the motor housing 2. Can be improved. Further, the tip of each protruding portion 7 is bent inward in the radial direction of the bearing holder 23 to form a locking portion 34, and each locking portion 34 is locked to the flange 29 of the bearing holder 23, thereby The holder 23 can be firmly fixed by the motor housing 2.

  Further, in the first embodiment, since the bearing holder 23 is formed by die casting (zinc alloy die casting), a preload stopping part in which a preloading member for applying a preload to the bearings 21 and 22 is disposed is provided integrally with the main body. It is possible to reduce the number of parts and assembly man-hours.

In addition, 1st Embodiment is not limited above, For example, it can comprise as follows.
The fitting between the one end 24 of the bearing holder 23 and the mounting hole 6 of the motor housing 2 is relaxed, and the inner diameter portion (inner peripheral surface 2A) of the motor housing 2 and the inner diameter portion (bearing mounting hole) of the bearing holder 23 are measured with a jig or the like. 26), each holding portion 30 of the bearing holder 23 is caulked. In this case, the coaxiality between the motor housing 2 and the bearing holder 23, that is, the coaxiality between the stator 3 and the rotor 4 can be further improved.
By providing each protrusion 7 with a hole corresponding to the protrusion 32 and caulking each holding part 30 of the bearing holder 23, the protrusion 32 of each holding part 30 corresponding to the hole of each protrusion 7. Mate. In this case, it is possible to improve the holding force of the corresponding protrusions 7 by the holding portions 30, and thus the coupling force between the motor housing 2 and the bearing holder 23.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to the accompanying drawings. In addition, about the structure which is the same as that of 1st Embodiment, or an equivalent structure, while giving the same name and code | symbol, the overlapping description is abbreviate | omitted.

  As shown in FIG. 5, the motor housing 42 has a boss portion 44 (standing wall) that is erected on the periphery of the mounting hole 6 and formed by press molding. In other words, the attachment hole 6 is formed on the inner periphery of the boss portion 44. The boss portion 44 extends inward (upward in FIG. 5) along the axis L <b> 1, and the height from the outer surface 5 </ b> A of the bottom portion 5 of the motor housing 42 is from the one end surface 24 </ b> A of the bearing holder 43 to the lower surface of the flange portion 29. The distance is set up to 29A. That is, the bearing holder 43 is positioned in the direction of the axis L <b> 1 with respect to the motor housing 42 by the flange portion 29 coming into contact with the tip of the boss portion 44. The plurality of projecting portions 7 are formed so as to extend in the axial direction L <b> 1 from the tip (end surface) of the boss portion 44.

  In the first embodiment, the flange portion 29 of the bearing holder 23 includes a holding portion 30 at a position corresponding to each protruding portion 7 of the motor housing 2. On the other hand, in the second embodiment, the flange 29 of the bearing holder 43 includes a notch 45 at a position corresponding to each protrusion 7 of the motor housing 2. Each notch 45 is formed by a wall surface 31A and a pair of wall surfaces 31B of each holding portion 30 in the bearing holder 23 of the first embodiment.

Next, a method for manufacturing a motor (not shown) of the second embodiment will be described. Here, a procedure for attaching the bearing holder 43 to the motor housing 42 will be described.
First, as shown in FIG. 6, the corresponding protrusions 7 of the motor housing 42 are inserted into the notches 45 of the bearing holder 43, and one end 24 of the bearing holder 43 is connected to the boss portion 44 of the motor housing 42. The inner periphery (mounting hole 6) is fitted. Further, the flange 29 of the bearing holder 43 is brought into contact with the tip of the boss 44 of the motor housing 42. Thereby, the bearing holder 43 is aligned with respect to the motor housing 42 and positioned in the direction of the axis L1.

  Next, as shown in FIG. 7, the tip of each protrusion 7 is pressurized radially inward of the bearing holder 43 by a bending jig (not shown). Thereby, the front-end | tip of each protrusion part 7 is bent, and the latching | locking part 34 is formed. As a result, the locking portion 34 of each protruding portion 7 is locked to the flange portion 29, and the bearing holder 43 is firmly fixed by the motor housing 42. As a result, the relative movement of the bearing holder 43 in the direction of the axis L1 with respect to the motor housing 42 is prevented.

According to the second embodiment, the same operational effects as those of the first embodiment described above can be obtained.
In the second embodiment, since the one end 24 of the bearing holder 43 is fitted to the boss portion 44 (standing wall) of the motor housing 42, the fitting length becomes long, and the fitting length becomes the plate thickness T1. As compared with the above, the coupling strength and positioning accuracy between the motor housing 42 and the bearing holder 43 (perpendicularity of the bearing holder 43 with respect to the bottom 5 of the motor housing 42) can be improved. Further, since the flange portion 29 of the bearing holder 43 is brought into contact with the tip of the boss portion 44 of the motor housing 42, the bearing holder 43 is axially aligned with respect to the motor housing 42 without using a jig or the like. Positioning can be performed in the L1 direction.

In addition, 2nd Embodiment is not limited above, For example, it can comprise as follows.
In the second embodiment, the bearing holder 43 is configured by providing a plurality of notches 45 in the flange portion 29. Naturally, like the bearing holder 23 of the first embodiment, each protrusion portion 7 is provided on the flange portion 29. Correspondingly, a plurality of holding portions 30 and insertion holes 31 can be provided.
In the second embodiment, the motor housing 42 can be configured by omitting the plurality of protrusions 7. In this case, the one end 24 of the bearing holder 43 and the boss portion 44 of the motor housing 42 are bonded, press-fitted, or combined by using them together.

DESCRIPTION OF SYMBOLS 1 Motor, 2 Motor housing, 5 Bottom part, 6 Mounting hole, 7 Protrusion part, 16 Rotor shaft, 21 and 22 Bearing, 23 Bearing holder, 24 One end, 25 Other end, 29 Gutter part, 30 Holding part

Claims (12)

A rotor shaft, a pair of bearings that support the rotor shaft, a bearing holder that is formed in a substantially cylindrical shape and holds the pair of bearings at a certain interval in the axial direction, and a substantially bottomed cylindrical shape. A motor housing comprising:
The motor housing has a mounting hole provided at the center of the bottom portion to which one end in the axial direction of the bearing holder is attached, and a plurality of protrusions provided at the periphery of the mounting hole and extending along the axial direction. do it,
The bearing holder is provided on the outer circumference on one end side in the axial direction and is disposed at a certain interval from the bottom of the motor housing to the other end side in the axial direction, and each protrusion is provided on the collar portion. A plurality of holding portions arranged corresponding to the
Each of the protrusions is assembled to the motor housing so as to be held by the corresponding holding part. The motor according to claim 1, wherein each holding portion has an insertion hole through which each corresponding protrusion is inserted. The motor according to claim 2, wherein each holding portion has a convex portion protruding from a wall surface of the insertion hole. 4. The motor according to claim 2, wherein each holding portion has a caulking portion that is formed by caulking inward in a radial direction of the bearing holder. 5. The motor housing has a boss provided on the periphery of the mounting hole and extending inward along the axis,
The motor according to claim 1, wherein one end of the bearing holder in the axial direction is fitted to the boss portion. The motor according to claim 5, wherein the plurality of projecting portions extend from a tip end of the boss portion. The motor according to claim 1, wherein the bearing holder has an outer diameter at one end in the axial direction larger than an outer diameter at a portion extending from the flange portion toward the other end in the axial direction. . The motor according to claim 1, wherein each protrusion has a locking portion formed by bending a tip. A rotor shaft, a pair of bearings that support the rotor shaft, a bearing holder that is formed in a substantially cylindrical shape and holds the pair of bearings at a certain interval in the axial direction, and a substantially bottomed cylindrical shape. A motor housing comprising:
The motor housing has a mounting hole provided at the center of the bottom portion to which one end in the axial direction of the bearing holder is attached, and a boss portion provided at a peripheral edge of the mounting hole and extending inward along the axis. ,
The bearing holder has a flange provided on the outer periphery on one end side in the axial direction and arranged at a constant interval from the bottom of the motor housing to the other end side in the axial direction. A motor which is assembled to the motor housing so as to be in contact with the tip. A rotor shaft, a pair of bearings that support the rotor shaft, a bearing holder that is formed in a substantially cylindrical shape and holds the pair of bearings at a certain interval in the axial direction, and a substantially bottomed cylindrical shape. A motor housing comprising: a motor housing comprising:
Forming a mounting hole provided in the center of the bottom portion of the motor housing, and a plurality of protrusions provided at a peripheral edge of the mounting hole and extending along the axial direction;
The bearing holder is provided on the outer circumference on one end side in the axial direction and is provided with a certain distance from the bottom of the motor housing to the other end side in the axial direction. Forming a plurality of holding portions arranged corresponding to the protruding portions, and insertion holes provided in the holding portions and through which the corresponding protruding portions are inserted, and
Inserting each protrusion through the corresponding insertion hole of each holding part;
Caulking each holding portion radially inward of the bearing holder;
The manufacturing method of the motor characterized by including. The method of manufacturing a motor according to claim 10, further comprising a step of bending the tip of each protrusion after inserting each protrusion into the corresponding insertion hole of each holding portion. A rotor shaft, a pair of bearings that support the rotor shaft, a bearing holder that is formed in a substantially cylindrical shape and holds the pair of bearings at a certain interval in the axial direction, and a substantially bottomed cylindrical shape. A motor housing comprising: a motor housing comprising:
Forming a mounting hole provided in the center of the bottom portion in the motor housing, and a boss portion provided in the periphery of the mounting hole and extending inward along the axis;
Forming a flange on the outer circumference of the bearing holder on one end side in the axial direction and arranged at a constant interval from the bottom of the motor housing to the other end side in the axial direction;
Inserting one axial end of the bearing holder into the boss of the motor housing;
Contacting the flange of the bearing holder with the tip of the boss;
The manufacturing method of the motor characterized by including.

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