阅读说明：本技术 马达组装方法及定心用夹具以及电动马达 (Motor assembling method, centering jig, and electric motor ) 是由 安秉一 柴田直道 山下幸生 于 2017-08-25 设计创作，主要内容包括：在马达组装方法及定心用夹具以及电动马达中,马达组装方法具有：将定子(15)从开口部(23)插入到定子壳体(11)内的工序；将定心用夹具(60)的轴部(61)插入到定子(15)的内周面(15a)而使定心部(62)与定子壳体(11)中的第1装配开口部(24)嵌合,并且使凸缘部(63)与开口部(23)嵌合的工序；将由定心用夹具(60)定心的定子(15)固定于定子壳体(11)的工序；从定子壳体(11)中拔出定心用夹具(60)的工序；及将旋转轴(14)和第1轴承(16)及第2轴承(17)插入到定子壳体(11)内,并且将轴承壳体(12)固定于开口部(23)的工序。(In a motor assembling method, a centering jig, and an electric motor, the motor assembling method includes: a step of inserting the stator (15) into the stator housing (11) from the opening (23); inserting a shaft portion (61) of a centering jig (60) into an inner peripheral surface (15a) of a stator (15) to fit a centering portion (62) into a 1 st fitting opening portion (24) of a stator housing (11), and to fit a flange portion (63) into an opening portion (23); a step of fixing the stator (15) centered by the centering jig (60) to the stator housing (11); a step of pulling out the centering jig (60) from the stator housing (11); and a step of inserting the rotating shaft (14), the 1 st bearing (16), and the 2 nd bearing (17) into the stator housing (11), and fixing the bearing housing (12) to the opening (23).)

1. A motor assembling method is characterized by comprising the following steps:

in the case of an electric motor, it is preferable that,

inserting the stator into the 1 st housing from the opening;

fitting a shaft portion of a centering jig into an inner peripheral surface of the stator and a fitting portion of the 1 st bearing in the 1 st housing, and fitting a flange portion into the opening;

fixing the stator centered by the centering jig to the 1 st housing;

a step of extracting the centering jig from the 1 st housing; and

inserting the rotating shaft, the 1 st bearing, and the 2 nd bearing into the 1 st housing, and fixing the 2 nd housing to the opening,

the electric motor is provided with:

a 1 st housing provided with an opening portion on one axial side;

a rotating shaft having a rotor and disposed at a center portion in the 1 st housing along an axial direction;

a stator disposed around the rotor in the 1 st housing;

a 2 nd housing fixed to the opening; and

and a 1 st bearing and a 2 nd bearing provided in the 1 st housing and the 2 nd housing and rotatably supporting respective end portions in an axial direction of the rotary shaft.

2. The motor assembling method according to claim 1,

after the centering jig is inserted into the 1 st housing, the stator is pressed in the axial direction by a pressing member and pressed against the 1 st housing, and the stator is fixed to the 1 st housing in this state.

3. The motor assembling method according to claim 1 or 2,

after the centering jig is inserted into the 1 st housing, a heat conductive member is filled in a gap between an outer peripheral surface of the stator and an inner peripheral surface of the 1 st housing, thereby fixing the stator to the 1 st housing.

4. The motor assembling method according to any one of claims 1 to 3,

after the centering jig is inserted into the 1 st housing, the stator is fixed to the 1 st housing by a fastening bolt.

5. The motor assembling method according to any one of claims 1 to 4,

in the stator, a 1 st insulating member and a 2 nd insulating member having a ring shape are fixed to respective end portions of a stator main body in an axial direction, and when the rotating shaft and the 1 st and 2 nd bearings are inserted into the 1 st housing, outer circumferential surfaces of the 1 st and 2 nd bearings are fitted to inner circumferential surfaces of the 1 st and 2 nd insulating members to center the rotor.

6. The motor assembling method according to claim 5,

after the stator is inserted into the 1 st housing, the inner circumferential surfaces of the 1 st insulating member and the 2 nd insulating member are finished, and the rotating shaft and the 1 st bearing and the 2 nd bearing are inserted into the 1 st housing.

7. The motor assembling method according to any one of claims 1 to 4,

when the rotating shaft, the 1 st bearing, and the 2 nd bearing are inserted into the 1 st housing, the outer peripheral surface of the rotor is fitted to the inner peripheral surface of the stator to center the rotor.

8. A centering jig used when an electric motor is assembled, the electric motor including:

a 1 st housing provided with an opening portion on one axial side;

a rotating shaft having a rotor and disposed at a center portion in the 1 st housing along an axial direction;

a stator disposed around the rotor in the 1 st housing;

a 2 nd housing fixed to the opening; and

a 1 st bearing and a 2 nd bearing provided in the 1 st housing and the 2 nd housing and rotatably supporting respective end portions in an axial direction of the rotary shaft,

the centering jig is characterized by comprising:

a shaft portion fitted to an inner peripheral surface of the stator inserted into the 1 st housing;

a centering portion provided at a front end portion of the shaft portion and fitted to a mounting portion of the 1 st bearing in the 1 st housing; and

and a flange portion fitted to the opening portion.

9. The centering jig according to claim 8,

is provided with: and a pressing member capable of pressing the stator in the axial direction into the 1 st housing.

10. An electric motor is characterized by comprising:

a 1 st housing provided with an opening portion on one axial side;

a rotating shaft having a rotor and disposed at a center portion in the 1 st housing along an axial direction;

a stator disposed around the rotor in the 1 st housing;

a 2 nd housing fixed to the opening;

a 1 st bearing and a 2 nd bearing provided in the 1 st housing and the 2 nd housing and rotatably supporting respective end portions in an axial direction of the rotary shaft; and

and a heat-conducting member disposed in a gap between an outer peripheral surface of the stator and an inner peripheral surface of the 1 st housing.

11. The electric motor of claim 10,

the stator is configured such that a 1 st insulating member and a 2 nd insulating member each having a ring shape are fixed to each end portion in an axial direction of a stator main body, and a coil is wound around the stator main body, the 1 st insulating member, and the 2 nd insulating member, wherein an outer peripheral surface of the 1 st bearing is fitted to an inner peripheral surface of the 1 st insulating member, and an outer peripheral surface of the 2 nd bearing is fitted to an inner peripheral surface of the 2 nd insulating member.

12. The electric motor according to claim 10 or 11,

a plurality of protrusions that come into contact with either one of the inner peripheral surface of the 1 st housing and the outer peripheral surface of the stator are provided at predetermined intervals in the circumferential direction on either one of the inner peripheral surface of the 1 st housing and the outer peripheral surface of the stator.

Technical Field

The present invention relates to a motor assembling method applied to a motor such as an electric supercharger, a centering jig used in the motor assembling method, and an electric motor assembled by the motor assembling method.

Background

In the electric supercharger, a compressor is driven by an electric motor to suck air from the outside, and the air is pressurized by an impeller to be compressed air, and the compressed air is supplied to an internal combustion engine or the like. An electric motor applied to the electric supercharger is configured to be fixed to a housing as follows: the rotating shaft to which the rotor is fixed is rotatably supported at the center of the housing, and the stator is disposed around the rotor. In assembling the electric motor, generally, a ring-shaped stator is inserted from one side in the axial direction of a cylindrical stator housing, a rotor is inserted into the center of the stator, and a bearing housing is fixed to an insertion opening of the stator housing.

As such an electric supercharger, for example, there is an electric supercharger described in the following patent document.

Prior art documents

Patent document

Patent document 1: japanese patent No. 5535992

Patent document 2: japanese patent laid-open publication No. 2016-020650

Disclosure of Invention

Technical problem to be solved by the invention

However, in the electric motor, it is important to mount the rotor in the housing so as to align the axial center of the stator with the rotor. If the axial centers of the rotor and the stator are displaced, the gap between the outer circumferential surface of the rotor and the inner circumferential surface of the stator becomes nonuniform in the circumferential direction. In this way, the electric motor generates imbalance due to magnetic attraction force at a circumferential position, and the rotation of the rotor becomes unstable, so that vibration increases, and noise is generated due to resonance with other components. Conventionally, when the stator is inserted into the stator housing, the stator is centered by fitting the outer peripheral surface of the stator to the inner peripheral surface of the stator housing. The rotor is inserted into the center of the stator, the bearing housing is fitted into the opening of the stator housing, and the rotating shaft of the rotor is supported by the bearing housing via the bearing, thereby centering the rotor. In this case, since the rotor and the stator are centered at different positions, it is difficult to set the coaxiality with high accuracy. Further, when the stator is fitted to the stator case, the outer peripheral surface of the stator is deformed, and it is difficult to accurately center the stator, and it is difficult to set high-accuracy coaxiality with the rotor.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a motor assembling method, a centering jig, and an electric motor, which can suppress the generation of noise by improving assembling accuracy and ensuring high-accuracy coaxiality between a rotor and a stator.

Means for solving the technical problem

In order to achieve the above object, a motor assembling method according to the present invention includes: inserting the stator into the 1 st housing from the opening in the electric motor; fitting a shaft portion of a centering jig into an inner peripheral surface of the stator and a fitting portion of the 1 st bearing in the 1 st housing, and fitting a flange portion into the opening; fixing the stator centered by the centering jig to the 1 st housing; a step of extracting the centering jig from the 1 st housing; and a step of inserting the rotation shaft, the 1 st bearing, and the 2 nd bearing into the 1 st housing, and fixing the 2 nd housing to the opening, the electric motor including: a 1 st housing provided with an opening portion on one axial side; a rotating shaft having a rotor and disposed at a center portion in the 1 st housing along an axial direction; a stator disposed around the rotor in the 1 st housing; a 2 nd housing fixed to the opening; and a 1 st bearing and a 2 nd bearing provided in the 1 st housing and the 2 nd housing and rotatably supporting respective end portions in an axial direction of the rotary shaft.

Therefore, the centering jig is positioned at least at two places with respect to the 1 st housing by fitting the shaft portion to the fitting portion of the 1 st housing and fitting the flange portion to the opening portion, and the stator is positioned on the centering jig by fitting the shaft portion to the inner peripheral surface of the stator. Therefore, the stator is positioned in the 1 st housing via the centering jig. After the stator is fixed to the 1 st housing in a state of being positioned in the 1 st housing, the centering jig is pulled out from the 1 st housing, and the rotating shaft is disposed in the 1 st housing so that the rotor is inserted into the inner circumferential surface of the stator, whereby the rotating shaft is positioned with respect to the inner circumferential surface of the stator via the rotor. As a result, the rotor and the stator of the rotating shaft are concentrically arranged, and the assembly accuracy is improved to ensure high-accuracy coaxiality of the rotor and the stator, thereby enabling assembly of the electric motor in which generation of noise during driving is suppressed.

In the motor assembling method according to the present invention, after the centering jig is inserted into the 1 st housing, the stator is pressed in the axial direction by the pressing member and is pressed against the 1 st housing, and the stator is fixed to the 1 st housing in this state.

Therefore, the stator in the 1 st housing is pressed by the pressing member into the 1 st housing, and therefore the stator can be fixed to the 1 st housing with high accuracy without causing positional deviation.

In the motor assembling method according to the present invention, after the centering jig is inserted into the 1 st housing, a heat-conducting member is filled in a gap between the outer peripheral surface of the stator and the inner peripheral surface of the 1 st housing, thereby fixing the stator to the 1 st housing.

Therefore, by filling the heat-conducting member into the gap between the outer peripheral surface of the stator and the inner peripheral surface of the 1 st case in a state where the stator in the 1 st case is positioned by the centering jig, it is possible to suppress the positional deviation of the stator positioned in the 1 st case with high accuracy by the centering jig by the heat-conducting member.

In the motor assembling method of the present invention, after the centering jig is inserted into the 1 st housing, the stator is fixed to the 1 st housing by a fastening bolt.

Therefore, the stator is fixed to the 1 st housing by the fastening bolt, and the stator in the 1 st housing is positioned by the centering jig, whereby the stator can be firmly fixed to the 1 st housing.

In the motor assembling method according to the present invention, the stator includes a 1 st insulating member and a 2 nd insulating member fixed to respective ends of the stator body in the axial direction, and the stator performs centering of the rotor by fitting outer circumferential surfaces of the 1 st bearing and the 2 nd bearing to inner circumferential surfaces of the 1 st insulating member and the 2 nd insulating member when the rotating shaft and the 1 st bearing and the 2 nd bearing are inserted into the 1 st housing.

Therefore, the outer circumferential surfaces of the 1 st bearing and the 2 nd bearing are fitted to the inner circumferential surfaces of the 1 st insulating member and the 2 nd insulating member to center the rotor, so that high coaxiality between the rotor and the stator can be ensured with a simple configuration.

In the motor assembling method of the present invention, after the stator is inserted into the 1 st housing, the inner peripheral surfaces of the 1 st insulating member and the 2 nd insulating member are finished, and the rotating shaft and the 1 st bearing and the 2 nd bearing are inserted into the 1 st housing.

Therefore, the rotor and the stator are concentrically arranged by fitting the outer peripheral surfaces of the 1 st bearing and the 2 nd bearing to the inner peripheral surfaces of the 1 st insulating member and the 2 nd insulating member which are finished, and the high-precision coaxiality of the rotor and the stator can be ensured by improving the assembly precision.

In the motor assembling method of the present invention, when the rotating shaft, the 1 st bearing and the 2 nd bearing are inserted into the 1 st housing, the outer peripheral surface of the rotor is fitted to the inner peripheral surface of the stator to perform centering of the rotor.

Therefore, the rotor and the stator are concentrically arranged by fitting the outer peripheral surface of the rotor and the inner peripheral surface of the stator, and the high-precision coaxiality of the rotor and the stator can be ensured by improving the assembly precision.

Further, a centering jig according to the present invention is used when an electric motor is assembled, the electric motor including: a 1 st housing provided with an opening portion on one axial side; a rotating shaft having a rotor and disposed at a center portion in the 1 st housing along an axial direction; a stator disposed around the rotor in the 1 st housing; a 2 nd housing fixed to the opening; a 1 st bearing and a 2 nd bearing provided in the 1 st housing and the 2 nd housing and rotatably supporting respective end portions in an axial direction of the rotating shaft, the centering jig comprising: a shaft portion fitted to an inner peripheral surface of the stator inserted into the 1 st housing; a centering portion provided at a front end portion of the shaft portion and fitted to a mounting portion of the 1 st bearing in the 1 st housing; and a flange portion fitted to the opening portion.

Therefore, the centering jig is positioned at least two places with respect to the 1 st housing by fitting the centering portion to the fitting portion of the 1 st housing and fitting the flange portion to the opening portion, and the stator is positioned on the centering jig by fitting the shaft portion to the inner peripheral surface of the stator. Therefore, the stator is positioned in the 1 st housing via the centering jig. Then, the centering jig is removed from the 1 st housing, and the rotating shaft is disposed in the 1 st housing so as to be inserted into the inner peripheral surface of the stator, whereby the rotating shaft is positioned with respect to the inner peripheral surface of the stator via the rotor. As a result, the rotor and the stator of the rotating shaft are concentrically arranged, and the assembly accuracy is improved, so that the high-accuracy coaxiality of the rotor and the stator is ensured, and the electric motor in which the generation of noise during driving is suppressed can be easily and accurately assembled.

The centering jig of the present invention is characterized by being provided with: and a pressing member capable of pressing the stator in the axial direction into the 1 st housing.

Therefore, the stator inserted into the 1 st housing is pressed by the pressing member into the 1 st housing, and the stator can be fixed to the 1 st housing with high accuracy and ease in this state.

Further, an electric motor according to the present invention includes: a 1 st housing provided with an opening portion on one axial side; a rotating shaft having a rotor and disposed at a center portion in the 1 st housing along an axial direction; a stator disposed around the rotor in the 1 st housing; a 2 nd housing fixed to the opening; a 1 st bearing and a 2 nd bearing provided in the 1 st housing and the 2 nd housing and rotatably supporting respective end portions in an axial direction of the rotary shaft; and a heat-conducting member disposed in a gap between an outer peripheral surface of the stator and an inner peripheral surface of the 1 st housing.

Therefore, since the heat-conducting member is disposed in the gap between the outer peripheral surface of the stator and the inner peripheral surface of the 1 st housing, the stator is closely fixed to the 1 st housing, and vibration of the stator can be suppressed, and the assembly accuracy is improved, so that high-accuracy coaxiality between the rotor and the stator can be ensured, and generation of noise can be suppressed. Further, the heat generated by the stator is transferred to the 1 st case via the heat conductive member to be radiated, and the cooling performance of the stator can be improved.

In the electric motor according to the present invention, the stator is configured such that a 1 st insulating member and a 2 nd insulating member each having a ring shape are fixed to each end portion in the axial direction of a stator main body, and a coil is wound around the stator main body, the 1 st insulating member, and the 2 nd insulating member, and an outer peripheral surface of the 1 st bearing is fitted to an inner peripheral surface of the 1 st insulating member, and an outer peripheral surface of the 2 nd bearing is fitted to an inner peripheral surface of the 2 nd insulating member.

Therefore, by fitting the outer peripheral surface of the 1 st bearing to the inner peripheral surface of the 1 st insulating member and fitting the outer peripheral surface of the 2 nd bearing to the inner peripheral surface of the 2 nd insulating member, only high processing accuracy of the outer peripheral surfaces of the bearings or the inner peripheral surfaces of the insulating members is ensured, and the axial centers of the rotor and the stator can be aligned, and assembly accuracy can be improved.

In the electric motor according to the present invention, a plurality of protrusions that come into contact with one of the inner peripheral surface of the 1 st housing and the outer peripheral surface of the stator are provided on one of the inner peripheral surface of the 1 st housing and the outer peripheral surface of the stator at predetermined intervals in the circumferential direction.

Therefore, the plurality of protrusions provided on one of the inner peripheral surface of the 1 st housing and the outer peripheral surface of the stator are in contact with the other, so that the occurrence of resonance between the 1 st housing and the stator can be suppressed.

Effects of the invention

According to the motor assembling method, the centering jig, and the electric motor of the present invention, the assembling accuracy is improved, and the high-accuracy coaxiality of the rotor and the stator can be ensured to suppress the generation of noise.

Drawings

Fig. 1 is a sectional view showing an electric motor according to embodiment 1.

Fig. 2 is a sectional view II-II of fig. 1 showing an internal structure of the electric motor.

Fig. 3 is a sectional view III-III of fig. 1 showing an internal structure of the electric motor.

Fig. 4 is a schematic diagram for explaining a process of inserting a stator into a stator housing in the motor assembling method according to embodiment 1.

Fig. 5 is a schematic diagram for explaining a process of inserting the centering jig into the stator housing in the motor assembling method.

Fig. 6 is a rear view showing the centering jig.

Fig. 7 is a schematic diagram for explaining a stator centering process using a centering jig in the motor assembling method.

Fig. 8 is a schematic diagram for explaining a process of inserting the rotor and the bearing housing into the stator housing in the motor assembling method.

Fig. 9 is a schematic diagram for explaining a stator fixing process using bolts in the motor assembling method according to embodiment 2.

Fig. 10 is a rear view showing the centering jig of embodiment 2.

Fig. 11 is a sectional view showing an electric motor according to embodiment 3.

Fig. 12 is an enlarged view of a main portion showing a centering structure of the rotor.

Fig. 13 is a sectional view showing an electric motor according to embodiment 4.

Detailed Description

Hereinafter, preferred embodiments of a motor assembling method, a centering jig, and an electric motor according to the present invention will be described in detail with reference to the drawings. The present invention is not limited to the embodiment, and when there are a plurality of embodiments, the present invention also includes an embodiment in which the respective embodiments are combined.

[ embodiment 1 ]

Fig. 1 is a sectional view showing an electric motor according to embodiment 1, fig. 2 is a sectional view II-II of fig. 1 showing an internal structure of the electric motor, and fig. 3 is a sectional view III-III of fig. 1 showing an internal structure of the electric motor.

The electric motor of embodiment 1 is applied to an electric supercharger. In the electric supercharger, a compressor is driven by an electric motor to suck air from the outside, and the air is pressurized by an impeller to be compressed air, and the compressed air is supplied to an internal combustion engine or the like.

As shown in fig. 1 to 3, the electric motor 10 includes a stator housing (1 st housing) 11, a bearing housing (2 nd housing) 12, a rotary shaft 14 having a rotor 13, a stator 15, and a 1 st bearing 16 and a 2 nd bearing 17.

The stator housing 11 has a cylindrical hollow shape in which a closed portion 22 is provided on one side (right side in fig. 1) in the axial direction of the housing main body 21 and an opening 23 is formed on the other side (left side in fig. 1). The housing main body 21 has an inner peripheral surface 21a having the same diameter in the axial direction, and the opening 23 is formed by a stepped portion having an inner diameter larger than the inner diameter of the inner peripheral surface 21 a. The blocking portion 22 is formed with a 1 st fitting opening portion 24 as a fitting portion to which the 1 st bearing 16 is fitted, and a damper (O-ring) 25 is fitted to an inner peripheral surface of the 1 st fitting opening portion 24. The stator housing 11 is provided with a housing portion 26 for housing an inverter (not shown) on one axial side, and a compressor (not shown) is mounted on the other axial side.

The bearing housing 12 has a circular plate shape, is fitted to the opening 23 of the stator housing 11 (housing main body 21), and is fixed by a plurality of bolts 27. The bearing housing 12 is set to have an outer diameter slightly smaller than the inner diameter of the opening 23. The bearing housing 12 is formed with a 2 nd fitting opening portion 28 as a fitting portion to which the 2 nd bearing 17 is fitted, and a damper (O-ring) 29 is fitted to an inner peripheral surface of the 2 nd fitting opening portion 28. Further, the dampers 25 and 29 are O-rings, but the dampers are not limited to O-rings having a circular cross section as long as they function as damping members, and may be damping members having other cross-sectional shapes and may have a plate shape.

The rotary shaft 14 is configured by fixing the rotor 13 at an intermediate portion in the axial direction, and support shafts 31 and 32 are provided at respective end portions in the axial direction. The rotary shaft 14 (rotor 13) is disposed at the center of the stator housing 11 and the bearing housing 12 in the axial direction. The stator 15 is annular and is disposed around the rotor 13 in the stator housing 11. The stator 15 is composed of a stator main body (stator) 33, a 1 st resin plate (1 st insulating member) 34, a 2 nd resin plate (2 nd insulating member) 35, a coil (winding) 36, and a 1 st coating portion (mold) 37 and a 2 nd coating portion (mold) 38. The stator main body 33 has a cylindrical shape, and a 1 st resin plate 34 and a 2 nd resin plate 35 having a ring shape are arranged at each end in the axial direction. The coil 36 is wound around the stator main body 33 and the 1 st and 2 nd resin plates 34 and 35, and the 1 st and 2 nd resin plates 34 and 35 and the coil 36 are covered with the 1 st and 2 nd covers 37 and 38.

The 1 st bearing 16 is fitted to the 1 st fitting opening portion 24 of the stator housing 11 (the blocking portion 22), and the 2 nd bearing 17 is fitted to the 2 nd fitting opening portion 28 of the bearing housing 12. The 1 st bearing 16 is configured by accommodating a cylindrical sleeve 41 and a rolling bearing 42 in series in the axial direction, and the rolling bearing 42 is configured by fitting a plurality of balls 42c between an outer ring 42a and an inner ring 42 b. The 1 st bearing 16 is disposed in the 1 st mounting opening 24 of the stator housing 11 without a gap, and the damper 25 is fixed in close contact with the outer peripheral surface of the rolling bearing 42. The 2 nd bearing 17 is configured by accommodating a cylindrical sleeve 43 and a rolling bearing 44 in series in the axial direction, and the rolling bearing 44 is configured by fitting a plurality of balls 44c between an outer ring 44a and an inner ring 44 b. The 2 nd bearing 17 is disposed without a gap in the 2 nd fitting opening portion 28 of the bearing housing 12, and the damper 29 is fixed in close contact with the outer peripheral surface of the rolling bearing 44. At this time, the axial front and rear end portions of the stator 15 are supported by the seal rings 45 and 46 fitted to the stator housing 11.

The support shaft 31 is inserted into the 1 st bearing 16 and rotatably supported by the rolling bearing 42, and the support shaft 32 is inserted into the 2 nd bearing 17 and rotatably supported by the rolling bearing 44 in the rotary shaft 14. In this case, the rotary shaft 14 (rotor 13) and the stator 15 are concentrically arranged. That is, the clearances provided between the outer peripheral surface 13a of the rotor 13 and the inner peripheral surface 15a of the stator 15 are set to the same size in the circumferential direction, thereby ensuring high-precision coaxiality.

The electric motor 10 is provided with a plurality of (5 in the present embodiment) protrusions 21b at predetermined intervals in the circumferential direction on an inner circumferential surface 21a of the housing main body 21 constituting the stator housing 11. Each of the protrusions 21b is provided over a predetermined length in an intermediate portion in the axial direction of the stator 15, and is capable of contacting the outer peripheral surface 15b of the stator 15. In this case, it is preferable that an odd number of the protrusions 21b be provided at unequal intervals in the circumferential direction. In the electric motor 10, a heat conductive member 51 is provided between the stator housing 11 and the stator 15. That is, a gap is provided between the inner peripheral surface 21a of the housing main body 21 and the outer peripheral surface 15b of the stator 15 in the stator housing 11, and the heat conductive member 51 is filled in the gap. The heat-conductive member is a silicone rubber-based filler having high thermal conductivity and elasticity. The heat-conducting member 51 is, for example, a low-hardness heat-dissipating silicone rubber TC series (Shin-Etsu corporation) or the like.

In the electric motor 10, first, the stator 15 is inserted into the stator housing 11 through the opening 23, and then, the bearing housing 12, the rotary shaft 14, and the 1 st bearing 16 and the 2 nd bearing 17 are assembled by being inserted into the stator housing 11. In this case, the electric motor 10 needs to be assembled to the stator housing 11 and the bearing housing 12 so that the rotation shaft 14 (the rotor 13) coincides with the axial center of the stator 15. Therefore, in the present embodiment, the electric motor 10 is assembled using the centering jig.

Fig. 3 is a schematic diagram for explaining a process of inserting a stator into a stator housing in the motor assembling method according to embodiment 1, fig. 4 is a schematic diagram for explaining a process of inserting a centering jig into a stator housing, fig. 5 is a rear view showing the centering jig, fig. 6 is a schematic diagram for explaining a centering process of a stator using the centering jig, and fig. 7 is a schematic diagram for explaining a process of inserting a rotor and a bearing housing into a stator housing.

As shown in fig. 4 and 5, the centering jig 60 includes a shaft portion 61, a centering portion 62, and a flange portion 63. The flange 63 is formed by connecting a small-diameter circular plate portion 71 and a large-diameter ring portion 72 by a plurality of (4 in the present embodiment) connecting portions 73. The plurality of coupling portions 73 that couple the circular plate portion 71 and the ring portion 72 are arranged at equal intervals in the circumferential direction, and thus a plurality of (4 in the present embodiment) working openings 74 are secured in the flange portion 63. The flange 63 has an outer diameter slightly smaller than the inner diameter of the opening 23 of the stator housing 11. The shaft portion 61 is provided integrally with the flat portion on the side of the center position of the flange portion 63. The shaft portion 61 has a positioning shaft 75 having a cylindrical shape, the positioning shaft 75 is set to have an outer diameter slightly smaller than an inner diameter of the stator 15, and a base end portion is coupled to a central portion of the flange portion 63 via a coupling shaft 76. The centering portion 62 has a cylindrical shape, is coupled to the distal end portion of the positioning shaft 75, and has a size in which the outer diameter is slightly smaller than the inner diameter of the 1 st fitting opening portion 24 in the stator housing 11 (the blocking portion 22). The centering jig 60 is provided with a plurality of (4 in the present embodiment) pressing bolts (pressing members) 77 at the disk portion 71 of the flange portion 63. Each pressing bolt 77 is screwed from the outside of the flange portion 63, and its tip portion protrudes from the shaft portion 61 side.

Therefore, in the centering jig 60, the positioning shaft 75 of the shaft portion 61 penetrates the inner peripheral surface 15a of the stator 15 disposed in the stator housing 11, and the centering portion 62 is disposed without a gap in the 1 st mounting opening portion 24 of the 1 st bearing 16, so that the flange portion 63 can be fitted in the opening portion 23. By rotationally advancing the pressing bolts 77, the distal end portions press the stators 15 arranged in the stator housing 11 in the axial direction, respectively, whereby the stators 15 can be pressed against the stator housing 11.

The motor assembling method of embodiment 1 includes: inserting the stator 15 into the stator housing 11 through the opening 23; inserting the shaft portion 61 of the centering jig 60 into the inner peripheral surface 15a of the stator 15 to fit the centering portion 62 into the 1 st fitting opening portion 24 and the flange portion 63 into the opening portion 23 of the stator housing 11; fixing the stator 15 centered by the centering jig 60 to the stator housing 11; a step of extracting the centering jig 60 from the stator housing 11; and a step of inserting the rotating shaft 14, the 1 st bearing 16, and the 2 nd bearing 17 into the stator housing 11, and fixing the bearing housing 12 to the opening 23.

Specifically, as shown in fig. 3, the stator housing 11 is fixed by a jig, not shown, and the stator 15 is first inserted into the stator housing 11 through the opening 23. At this time, it is preferable to heat the stator housing 11 in advance to enlarge the inner diameter of the inner peripheral surface 21a (the protruding portion 21b) of the housing main body 21. As shown in fig. 4, the stator 15 is disposed in the stator housing 11 such that the outer peripheral surface 15b and the inner peripheral surface 21a of the housing main body 21 maintain a predetermined gap. Next, the centering jig 60 is inserted into the stator housing 11 to position the stator 15. That is, as shown in fig. 5 and 6, in the centering jig 60, the positioning shaft 75 of the shaft portion 61 is inserted into the inner peripheral surface 15a of the stator 15, and the centering portion 62 is disposed without a gap in the 1 st assembly opening 24 of the housing main body 21. The flange 63 of the centering jig 60 is disposed in the opening 23 of the housing main body 21 without a gap.

Therefore, the centering portion 62 is disposed without a gap in the 1 st fitting opening portion 24 and the flange portion 63 is fitted in the opening portion 23, whereby the centering jig 60 is positioned in the stator housing 11 at two places. At this time, since the positioning shaft 75 of the shaft portion 61 is inserted into the inner peripheral surface 15a of the stator 15, the centering jig 60 positioned in the stator housing 11 positions the stator 15 in the stator housing 11 via the centering jig 60. Then, the plurality of pressing bolts 77 are rotated and advanced to press the distal end portions against the stator 15, and the stator 15 is temporarily fixed by pressing it against the stator housing 11.

Then, the stator 15 temporarily fixed by the plurality of pressing bolts 77 is fixed to the stator housing 11 by centering by the centering jig 60. That is, a tool is inserted into the stator housing 11 through the working opening 74 of the centering jig 60, and the heat-conducting member 51 is filled in the gap between the outer peripheral surface 15b of the stator 15 and the inner peripheral surface 21a of the housing main body 21. When the heat-conducting member 51 is cured, the stator 15 is fixed in the stator housing 11 so as not to move in the radial and axial directions. At this time, since the stator housing 11 is heated in advance and the inner diameter of the inner peripheral surface 21a (the protruding portion 21b) of the housing main body 21 is enlarged, it is preferable to cool the stator housing 11 to normal temperature before the stator 15 is fixed to the stator housing 11. Further, when the stator 15 is fixed in the stator housing 11, a part of the plurality of protrusions 21b provided at the inner circumferential surface 21a at unequal intervals in the circumferential direction is in contact with the outer circumferential surface 15b of the stator 15.

Then, as shown in fig. 7, the centering jig 60 is pulled out from the stator housing 11. The rotary shaft 14, the 1 st bearing 16, the 2 nd bearing 17, and the bearing housing 12 are inserted into the stator housing 11 through the opening 23 and fixed. In this case, the 1 st bearing 16 and the 2 nd bearing 17 are attached to the support shafts 31 and 32 of the rotary shaft 14, the bearing housing 12 is attached to the 2 nd bearing 17 to form an assembly, and the assembly is inserted into the stator housing 11 from the opening 23 and fixed. That is, the 1 st bearing 16 is disposed without a gap in the 1 st assembly opening 24 of the stator housing 11, the rotor 13 of the rotary shaft 14 is disposed in the stator 15, the bearing housing 12 is disposed without a gap in the opening 23, and the bearing housing 12 is fixed to the stator housing 11 by a plurality of bolts 27 as shown in fig. 1.

As described above, the motor assembling method according to embodiment 1 includes: inserting the stator 15 into the stator housing 11 through the opening 23; inserting the shaft portion 61 of the centering jig 60 into the inner peripheral surface 15a of the stator 15 to fit the centering portion 62 into the 1 st fitting opening portion 24 and the flange portion 63 into the opening portion 23 of the stator housing 11; fixing the stator 15 centered by the centering jig 60 to the stator housing 11; a step of pulling out the centering jig 60 from the stator housing 11; and a step of inserting the rotating shaft 14, the 1 st bearing 16, and the 2 nd bearing 17 into the stator housing 11, and fixing the bearing housing 12 to the opening 23.

Therefore, the centering jig 60 is positioned at two places with respect to the stator housing 11 by fitting the centering portion 62 to the 1 st fitting opening portion 24 of the stator housing 11 and fitting the flange portion 63 to the opening portion 23, and the stator 15 is positioned on the centering jig 60 by fitting the shaft portion 61 to the inner peripheral surface 15a of the stator 15. Therefore, the stator 15 is positioned in the stator housing 11 via the centering jig 60. After the stator 15 is fixed in a state of being positioned in the stator housing 11, the centering jig 60 is pulled out from the stator housing 11, and the rotary shaft 14 is disposed in the stator housing 11 so that the rotor 13 is inserted into the inner circumferential surface 15a of the stator 15, whereby the rotary shaft 14 is positioned with respect to the inner circumferential surface 15a of the stator 15 via the rotor 13. As a result, the rotor 13 and the stator 15 of the rotating shaft 14 are concentrically arranged, and the electric motor 10 in which the occurrence of noise during driving is suppressed can be assembled by improving the assembly accuracy and ensuring high-accuracy coaxiality of the rotor 13 and the stator 15.

In the motor assembling method according to embodiment 1, after the centering jig 60 is inserted into the stator housing 11, the stator 15 is pressed in the axial direction by the plurality of pressing bolts 77 and is pressed against the stator housing 11, and the stator 15 is fixed to the stator housing 11 in this state. Therefore, since the stator 15 in the stator housing 11 is pressed against the stator housing 11 by the pressing bolts 77, the stator 15 can be fixed to the stator housing 11 with high accuracy without being displaced.

In the motor assembling method according to embodiment 1, after the centering jig 60 is inserted into the stator housing 11, the heat-conducting member 51 is filled in the gap between the outer peripheral surface 15b of the stator 15 and the inner peripheral surface 21a of the stator housing 11, thereby fixing the stator 15 to the stator housing 11. Therefore, by filling the heat-conducting member 51 into the gap between the outer peripheral surface 15b of the stator 15 and the inner peripheral surface 21a of the stator housing 11 in the state where the stator 15 in the stator housing 11 is positioned by the centering jig 60, it is possible to suppress the position of the stator 15 positioned in the stator housing 11 with high accuracy using the centering jig 60 from being displaced by the heat-conducting member 51.

Further, the centering jig according to embodiment 1 includes: a shaft portion 61 fitted to an inner peripheral surface 15a of the stator 15 inserted into the stator housing 11; a centering portion 62 provided at a front end portion of the shaft portion 61 and fitted to the 1 st fitting opening portion 24 of the stator housing 11; and a flange 63 fitted into the opening 23.

Therefore, the centering jig 60 is positioned at two places with respect to the stator housing 11 by fitting the centering portion 62 to the 1 st fitting opening portion 24 of the stator housing 11 and fitting the flange portion 63 to the opening portion 23, and the stator 15 is positioned on the centering jig 60 by fitting the shaft portion 61 to the inner peripheral surface 15a of the stator 15. Therefore, the stator 15 is positioned in the stator housing 11 via the centering jig 60. Then, the centering jig 60 is pulled out of the stator housing 11, and the rotary shaft 14 is disposed in the stator housing 11 so that the rotor 13 is inserted into the inner peripheral surface 15a of the stator 15, whereby the rotary shaft 14 is positioned with respect to the inner peripheral surface 15a of the stator 15 via the rotor 13. As a result, the rotor 13 and the stator 15 of the rotating shaft 14 are concentrically arranged, and the assembly accuracy is improved, so that the high-accuracy coaxiality of the rotor 13 and the stator 15 is ensured, and the electric motor 10 in which the generation of noise during driving is suppressed can be easily and accurately assembled.

The centering jig according to embodiment 1 is provided with a pressing bolt 77 capable of pressing the stator 15 in the axial direction and pressing the stator against the stator housing 11. Therefore, the stator 15 inserted into the stator housing 11 is pressed against the stator housing 11 by the pressing bolt 77, and the stator 15 can be fixed to the stator housing 11 with high accuracy and ease in this state.

The electric motor according to embodiment 1 further includes: a stator housing 11 having an opening 23 provided at one axial side; a rotating shaft 14 having a rotor 13 and disposed at a central portion in the stator housing 11 along the axial direction; a stator 15 disposed around the rotor 13 in the stator case 11; a bearing housing 12 fixed to the opening 23; a 1 st bearing 16 and a 2 nd bearing 17 which are provided in the stator housing 11 and the bearing housing 12 and support shafts 31 and 32 which rotatably support the rotary shaft 14; and a heat-conducting member 51 disposed in a gap between the outer peripheral surface 15b of the stator 15 and the inner peripheral surface 21a of the stator housing 11.

Therefore, since the heat-conducting member 51 is disposed in the gap between the outer peripheral surface 15b of the stator 15 and the inner peripheral surface 21a of the stator housing 11, the stator 15 is closely fixed to the stator housing 11, vibration of the stator 15 can be suppressed, and high-precision coaxiality between the rotor 13 and the stator 15 can be secured and noise generation can be suppressed by improving assembly precision. Further, the heat generated by the stator 15 is transferred to the stator housing 11 via the heat conductive member 51 to be dissipated, and the cooling performance of the stator 15 can be improved.

In the electric motor according to embodiment 1, a plurality of protrusions 21b are provided on an inner circumferential surface 21a of the stator housing 11 at predetermined intervals in the circumferential direction, and a part of the protrusions is in contact with an outer circumferential surface 15b of the stator 15. Therefore, the occurrence of resonance between the stator housing 11 and the stator 15 can be suppressed by contacting a part of the plurality of protrusions 21b provided on the inner circumferential surface 21a of the stator housing 11 with the outer circumferential surface 15b of the stator 15. In this case, by providing the odd number of protrusions 21b at unequal intervals in the circumferential direction of the stator housing 11, it is possible to suppress the occurrence of resonance in the 2 nd order mode (2 nd order natural frequency) or the 4 th order mode (4 th order natural frequency) of vibration. In this case, a plurality of protrusions may be provided on the outer circumferential surface 15b of the stator 15 at predetermined intervals in the circumferential direction, with a portion of the protrusions contacting the inner circumferential surface 21a of the stator housing 11.

[ 2 nd embodiment ]

Fig. 8 is a schematic diagram for explaining a stator fixing process using bolts in the motor assembling method according to embodiment 2, and fig. 9 is a rear view showing a centering jig according to embodiment 2. Since the basic configuration of the present embodiment is the same as that of embodiment 1 described above, the description will be made with reference to fig. 1, and components having the same functions as those of embodiment 1 are given the same reference numerals, and detailed description thereof will be omitted.

As shown in fig. 1 and 8, the electric motor 10A includes a stator housing 11, a bearing housing 12, a rotary shaft 14 having a rotor 13, a stator 15, and a 1 st bearing 16 and a 2 nd bearing 17.

The stator housing 11 is composed of a housing main body 21 and a closing portion 22, and is provided with an opening portion 23, and a 1 st fitting opening portion 24 is formed in the closing portion 22. The bearing housing 12 is fitted to the opening 23 of the stator housing 11 and fixed by a plurality of bolts 27. The bearing housing 12 is formed with a 2 nd fitting opening portion 28.

The rotary shaft 14 is configured by fixing the rotor 13 at an intermediate portion in the axial direction, and support shafts 31 and 32 are provided at respective end portions in the axial direction. The rotary shaft 14 (rotor 13) is disposed at the center of the stator housing 11 and the bearing housing 12 in the axial direction. The stator 15 is disposed around the rotor 13 in the stator housing 11. The 1 st bearing 16 is fitted to the 1 st fitting opening portion 24 of the stator housing 11 (the blocking portion 22), and the 2 nd bearing 17 is fitted to the 2 nd fitting opening portion 28 of the bearing housing 12. The rotating shaft 14 has a support shaft 31 rotatably supported by the 1 st bearing 16, and a support shaft 32 rotatably supported by the 2 nd bearing 17.

The electric motor 10A is provided with a heat conductive member 51 between the stator housing 11 and the stator 15. That is, a gap is provided between the inner peripheral surface 21a of the housing main body 21 and the outer peripheral surface 15b of the stator 15 in the stator housing 11, and the heat conductive member 51 is filled in the gap. As shown in fig. 8 and 9, in the electric motor 10A, the stator 15 is fixed to the stator housing 11 by a plurality of (2 in the present embodiment) fastening bolts 81. That is, the stator housing 11 has a plurality of (2 in the present embodiment) female screw portions 82 formed around the 1 st fitting opening 24 in the closing portion 22. The stator 15 is provided with a plurality of (2 in the present embodiment) through holes 83 formed along the axial direction. The through hole 83 is formed offset toward the center side in the radial direction of the stator 15, and is formed to have an inner diameter larger than the outer diameter of the fastening bolt 81. The through-hole 83 may be formed to be offset to the outer peripheral portion side in the radial direction of the stator 15.

The centering jig 60 includes a shaft portion 61, a centering portion 62, and a flange portion 63. The centering jig 60 is provided with a plurality of (4 in the present embodiment) pressing bolts (pressing members) 77 at the disk portion 71 of the flange portion 63. The centering jig 60 has a plurality of (2 in the present embodiment) notch portions 84 formed in the disk portion 71.

The motor assembly method of embodiment 2 includes: inserting the stator 15 into the stator housing 11 through the opening 23; inserting the shaft portion 61 of the centering jig 60 into the inner peripheral surface 15a of the stator 15 to fit the centering portion 62 into the 1 st fitting opening portion 24 and the flange portion 63 into the opening portion 23 of the stator housing 11; fixing the stator 15 centered by the centering jig 60 to the stator housing 11; a step of pulling out the centering jig 60 from the stator housing 11; and a step of inserting the rotating shaft 14, the 1 st bearing 16, and the 2 nd bearing 17 into the stator housing 11, and fixing the bearing housing 12 to the opening 23.

Specifically, first, the stator 15 is inserted into the stator housing 11 through the opening 23. At this time, the stator 15 is disposed such that the through-holes 83 of the stator 15 and the female screw portions 82 of the stator housing 11 are located at the same position in the circumferential direction. Next, the centering jig 60 is inserted into the stator housing 11 to position the stator 15. At this time, the centering jig 60 is disposed so that the notches 84 of the centering jig 60 and the through holes 83 of the stator 15 are located at the same positions in the circumferential direction.

Therefore, the centering portion 62 is disposed without a gap in the 1 st fitting opening portion 24 and the flange portion 63 is fitted in the opening portion 23, whereby the centering jig 60 is positioned in the stator housing 11 at two places. At this time, since the positioning shaft 75 of the shaft portion 61 is inserted into the inner peripheral surface 15a of the stator 15, the centering jig 60 positioned in the stator housing 11 positions the stator 15 in the stator housing 11 via the centering jig 60. Then, the plurality of pressing bolts 77 are rotated and advanced to press the distal end portions against the stator 15, and the stator 15 is temporarily fixed by pressing it against the stator housing 11.

Then, the stator 15 temporarily fixed by the plurality of pressing bolts 77 is fixed to the stator housing 11 by centering by the centering jig 60. That is, the fastening bolt 81 is inserted into the through-hole 83 of the stator 15 from the operation opening portion 74 of the centering jig 60, and the fastening bolt 81 is rotated by using a fastening tool and screwed into each female screw portion 82 of the stator housing 11. Then, a tool is inserted into the stator housing 11, and the heat-conducting member 51 is filled and cured in the gap between the outer peripheral surface 15b of the stator 15 and the inner peripheral surface 21a of the housing main body 21. In this way, the stator 15 is fixed in the stator housing 11 so as not to move in the radial and axial directions by the fastening bolt 81 and the heat conductive member 51.

Then, as shown in fig. 7, the centering jig 60 is pulled out from the stator housing 11, and the rotary shaft 14, the 1 st bearing 16, the 2 nd bearing 17, and the bearing housing 12 are inserted into the stator housing 11 from the opening 23 and fixed.

In this manner, in the motor assembling method according to embodiment 2, after the centering jig 60 is inserted into the stator housing 11, the stator 15 is fixed to the stator housing 11 by the plurality of fastening bolts 81.

Therefore, in a state where the stator 15 in the stator housing 11 is positioned by the centering jig 60, the stator 15 can be firmly fixed to the stator housing 11 by fixing the stator 15 to the stator housing 11 by the plurality of fastening bolts 81.

In embodiment 2, the stator 15 is fixed in the stator housing 11 by the fastening bolts 81 and the heat-conducting member 51, but the heat-conducting member 51 may be eliminated by increasing the number of the fastening bolts 81.

[ embodiment 3 ]

Fig. 10 is a sectional view showing the electric motor according to embodiment 3, and fig. 11 is an enlarged view of a main portion showing a centering structure of a rotor. Note that the same reference numerals are given to members having the same functions as those of the above-described embodiment, and detailed description thereof is omitted.

As shown in fig. 10 and 11, the electric motor 100 includes a stator housing (1 st housing) 101, a 1 st bearing housing (2 nd housing) 102, a 2 nd bearing housing (2 nd housing) 103, a rotary shaft 14 having a rotor 13, a stator 15, and a 1 st bearing 16 and a 2 nd bearing 17.

The stator housing 101 has a cylindrical shape, and has an opening 111 formed on one axial side (the right side in fig. 10) and an opening 112 formed on the other axial side (the left side in fig. 10). The 1 st bearing housing 102 has a circular plate shape, and has a 1 st mounting opening 113 formed at a central position thereof as a mounting portion for mounting the 1 st bearing 16, and a damper (O-ring) 114 is mounted on an inner peripheral surface of the 1 st mounting opening 113. The 1 st bearing housing 102 is fitted to the opening 111 of the stator housing 101 and fixed by a plurality of bolts 115. The 1 st bearing housing 102 is set to have an outer diameter slightly smaller than the inner diameter of the opening 111. The 2 nd bearing housing 103 has a circular plate shape, and a 2 nd mounting opening 116 as a mounting portion for mounting the 2 nd bearing 17 is formed at a central position, and a damper (O-ring) 117 is mounted on an inner peripheral surface of the 2 nd mounting opening 116. The 2 nd bearing housing 103 is fitted to the opening 112 of the stator housing 101 and fixed by a plurality of bolts 118. The 2 nd bearing housing 103 is set to a size in which the outer diameter is slightly smaller than the inner diameter of the opening 112.

The rotary shaft 14 is configured by fixing the rotor 13 at an intermediate portion in the axial direction, and support shafts 31 and 32 are provided at respective end portions in the axial direction. The rotary shaft 14 (rotor 13) is disposed at the center of the stator housing 101 in the axial direction. The stator 15 is annular and is disposed around the rotor 13 in the stator housing 101. In this case, the stator 15 is fixed by press-fitting the outer peripheral portion into the inner peripheral portion of the stator housing 101.

The 1 st bearing 16 is fitted in the 1 st fitting opening portion 113 of the 1 st bearing housing 102, and the 2 nd bearing 17 is fitted in the 2 nd fitting opening portion 116 of the 2 nd bearing housing 103. In this case, the stator 15 is set to have a size in which the inner diameters of the 1 st resin plate 34 and the 2 nd resin plate 35 are smaller than the inner diameter of the stator main body 33, and after the stator 15 is fixed in the stator housing 101, the inner circumferential surfaces 34a and 35a of the 1 st resin plate 34 and the 2 nd resin plate 35 are finished, whereby the center of the stator 15 coincides with the center of the stator housing 101. On the other hand, in the 1 st bearing 16 mounted on the 1 st bearing housing 102 and the 2 nd bearing 17 mounted on the 2 nd bearing housing 103, one end portions of the respective sleeves 41 and 43 protrude toward the rotor 13 side, and outer circumferential protruding surfaces 41a and 43b are formed, respectively. The outer peripheral projection surfaces 41a and 43b are set to have an outer diameter slightly larger than the outer diameter of the bearings 16 and 17 (the sleeves 41 and 43). The outer peripheral protruding surface 41a of the 1 st bearing 16 is fitted to the inner peripheral surface 34a of the 1 st resin plate 34, and the outer peripheral protruding surface 43a of the 2 nd bearing 17 is fitted to the inner peripheral surface 35a of the 2 nd resin plate 35.

Further, in the rotating shaft 14, the support shaft 31 is rotatably supported by the 1 st bearing 16, and the support shaft 32 is rotatably supported by the 2 nd bearing 17. Therefore, the rotary shaft 14 (rotor 13) and the stator 15 are concentrically arranged.

The motor assembling method of embodiment 3 includes: a step of inserting and fixing the stator 15 into the stator housing 101 through the opening 112; finishing inner circumferential surfaces 34a, 35a of a 1 st resin plate 34 and a 2 nd resin plate 35 of a stator 15 disposed in a stator housing 101; inserting the rotary shaft 14 and the 1 st and 2 nd bearings 16, 17 into the stator housing 101 to fit the outer circumferential protruding surfaces 41a, 43b of the 1 st and 2 nd bearings 16, 17 into the inner circumferential surfaces 34a, 35a of the 1 st and 2 nd resin plates 34, 35; and fixing the 1 st bearing housing 102 to the opening 111 and fixing the 2 nd bearing housing 103 to the opening 112.

Specifically, the stator housing 101 is fixed by a jig not shown, and first, the stator 15 is fitted and fixed to the inner circumferential surface 101a of the stator housing 101 through the opening 112. Here, the inner circumferential surfaces 34a and 35a of the 1 st resin plate 34 and the 2 nd resin plate 35 of the stator 15 fixed in the stator housing 101 are finished by a cutting device, whereby the roundness of the inner circumferential surfaces 34a and 35a of the resin plates 34 and 35 is ensured and the center of the stator housing 101 is aligned with the center of the stator 15. Next, the rotary shaft 14, the 1 st bearing 16, the 2 nd bearing 17, and the 2 nd bearing housing 103 are inserted into the stator housing 101 through the opening 112 and fixed. In this case, the 1 st bearing 16 and the 2 nd bearing 17 are attached to the support shafts 31 and 32 of the rotary shaft 14, the 2 nd bearing housing 103 is attached to the 2 nd bearing 17 to form an assembly, and the assembly is inserted into the stator housing 101 through the opening 112 and fixed.

That is, the rotor 13 of the rotary shaft 14 is disposed in the stator 15, and the outer peripheral protruding surface 41a of the 1 st bearing 16 is fitted to the inner peripheral surface 34a of the 1 st resin plate 34, and the outer peripheral protruding surface 43b of the 2 nd bearing 17 is fitted to the inner peripheral surface 35a of the 2 nd resin plate 35. Therefore, the center of the stator 15 coincides with the center of the rotor 13 of the rotary shaft 14. The 2 nd bearing housing 103 fitted to the opening 112 is fixed by a plurality of bolts 118. The 1 st bearing housing 102 is fitted to the opening 111, and the 1 st bearing housing 102 is fitted to the 1 st bearing 16 and fixed by a plurality of bolts 115. In this case, the inner diameter of the mounting hole formed in each bearing housing 102, 130 and penetrated by the bolt 115, 118 is set to be larger than the outer diameter of the bolt 115, 118, and the position of each bearing housing 102, 130 is not displaced by fastening the bolt 115, 118.

In this manner, in the motor assembling method according to embodiment 3, when the rotary shaft 14 and the 1 st and 2 nd bearings 16, 17 are inserted into the stator housing 101, the outer circumferential protruding surfaces 41a, 43a of the 1 st and 2 nd bearings 16, 17 are fitted to the inner circumferential surfaces 34a, 35a of the 1 st and 2 nd resin plates 34, 35, respectively, to thereby perform centering of the rotor 13.

Therefore, the rotor 13 is centered by fitting the outer peripheral protruding surfaces 41a and 43a of the 1 st bearing 16 and the 2 nd bearing 17 to the inner peripheral surfaces 34a and 35a of the 1 st resin plate 34 and the 2 nd resin plate 35, and a high degree of coaxiality between the rotor 13 and the stator 15 can be ensured with a simple configuration.

In the motor assembling method according to embodiment 3, after the stator 15 is inserted into the stator housing 101, the inner circumferential surfaces 34a and 35a of the 1 st resin plate 34 and the 2 nd resin plate 35 are finished, and the rotary shaft 14 and the 1 st bearing 16 and the 2 nd bearing 17 are inserted into the stator housing 101. Therefore, the rotor 13 and the stator 15 are concentrically arranged by fitting the outer peripheral protruding surfaces 41a and 43a of the 1 st bearing 16 and the 2 nd bearing 17 to the inner peripheral surfaces 34a and 35a of the 1 st resin plate 34 and the 2 nd resin plate 35 that have been finished, and the assembly accuracy is improved, so that the high-precision coaxiality of the rotor 13 and the stator 15 can be ensured.

In the electric motor according to embodiment 3, the 1 st and 2 nd resin plates 34, 35 having a ring shape are fixed to the respective ends in the axial direction of the stator main body 33, the stator 15 is configured by winding the coil 36 (see fig. 2) around the stator main body 33 and the 1 st and 2 nd resin plates 34, 35, the outer peripheral protruding surface 41a of the 1 st bearing 16 is fitted to the inner peripheral surface 34a of the 1 st resin plate 34, and the outer peripheral protruding surface 43a of the 2 nd bearing 17 is fitted to the inner peripheral surface 35a of the 2 nd resin plate 35.

Therefore, by fitting the outer peripheral projecting surface 41a of the 1 st bearing 16 to the inner peripheral surface 34a of the 1 st resin plate 34 and fitting the outer peripheral projecting surface 43a of the 2 nd bearing 17 to the inner peripheral surface 35a of the 2 nd resin plate 35, only high machining accuracy of the outer peripheral projecting surfaces 41a and 43a of the bearings 16 and 17 or the inner peripheral surfaces 34a and 35a of the resin plates 34 and 35 is ensured, and the axial centers of the rotor 13 and the stator 15 can be aligned, and assembly accuracy can be improved.

[ 4 th embodiment ]

Fig. 12 is a sectional view showing an electric motor according to embodiment 4. Note that the same reference numerals are given to members having the same functions as those of the above-described embodiment, and detailed description thereof is omitted.

As shown in fig. 12, the electric motor 120 includes a stator housing (1 st housing) 101, a 1 st bearing housing (2 nd housing) 102, a 2 nd bearing housing (2 nd housing) 103, a rotary shaft 14 having a rotor 13, a stator 15, and a 1 st bearing 16 and a 2 nd bearing 17.

The motor assembling method of embodiment 3 includes: a step of inserting and fixing the stator 15 into the stator housing 101 through the opening 112; a step of finishing an inner peripheral surface 15a of the stator 15 disposed in the stator housing 101; inserting the rotary shaft 14, the 1 st bearing 16 and the 2 nd bearing 17 into the stator housing 101 to fit the outer peripheral surface 13a of the rotor 13 with the inner peripheral surface 15a of the stator 15; and fixing the 1 st bearing housing 102 to the opening 111 and fixing the 2 nd bearing housing 103 to the opening 112.

Specifically, the stator housing 101 is fixed by a jig not shown, and first, the stator 15 is fitted and fixed to the inner circumferential surface 101a of the stator housing 101 through the opening 112. Here, the inner peripheral surface 15a of the stator 15 fixed in the stator housing 101 is finished by a cutting device, so that the center of the stator housing 101 and the center of the stator 15 are aligned while the roundness of the inner peripheral surface 15a of the stator 15 is ensured. Next, the rotary shaft 14, the 1 st bearing 16, the 2 nd bearing 17, and the 2 nd bearing housing 103 are inserted into the stator housing 101 through the opening 112 and fixed. In this case, the 1 st bearing 16 and the 2 nd bearing 17 are attached to the support shafts 31 and 32 of the rotary shaft 14, the 2 nd bearing housing 103 is attached to the 2 nd bearing 17 to form an assembly, and the assembly is inserted into the stator housing 101 through the opening 112 and fixed.

That is, the rotor 13 of the rotary shaft 14 is disposed in the stator 15, and the outer peripheral surface 13a of the rotor 13 is fitted to the outer peripheral surface 15b of the stator 15. Therefore, the center of the rotor 13 of the rotary shaft 14 coincides with the center of the stator 15. The 2 nd bearing housing 103 fitted to the opening 112 is fixed by a plurality of bolts 118. The 1 st bearing housing 102 is fitted to the opening 111, and the 1 st bearing housing 102 is fitted to the 1 st bearing 16 and fixed by a plurality of bolts 115. In this case, the inner diameter of the mounting hole formed in each bearing housing 102, 130 and penetrated by the bolt 115, 118 is set to be larger than the outer diameter of the bolt 115, 118, and the position of each bearing housing 102, 130 is not displaced by fastening the bolt 115, 118.

As described above, in the motor assembling method according to embodiment 4, when the rotary shaft 14, the 1 st bearing 16, and the 2 nd bearing 17 are inserted into the stator housing 101, the outer circumferential surface 13a of the rotor 13 is fitted to the inner circumferential surface 15a of the stator 15, and the rotor 13 is centered.

Therefore, the rotor 13 and the stator 15 are concentrically arranged by fitting the outer peripheral surface 13a of the rotor 13 and the inner peripheral surface 15a of the stator 15, and the high-precision coaxiality of the rotor 13 and the stator 15 can be ensured by improving the assembly precision.

The structure of the rotor, the stator, and the like of the electric motor according to the present invention is not limited to the structure of each of the above embodiments. For example, in the present embodiment, the bearings 16 and 17 are constituted by the bushings 41 and 43 and the bearings 42 and 44, but the bushings 41 and 43 may be eliminated and constituted by only the bearings 42 and 44.

In the above embodiment, as the centering jig 60, the pressing bolt is provided in addition to the shaft portion 61, the centering portion 62, and the flange portion 63. The pressing bolt 77 is a pressing member of the present invention, and is not limited to the pressing bolt 77. For example, the 1 st housing may be disposed along the vertical direction, and the stator may be inserted into the 1 st housing by moving the stator downward in the vertical direction, and the stator may be pressed by the pressing member from above.

In the above-described embodiment, by applying embodiment 3 or embodiment 4 to embodiment 1, the assembly accuracy of the electric motor can be further improved.

Description of the symbols

10. 10A-electric motor, 11-stator housing (1 st housing), 12-bearing housing (2 nd housing), 13-rotor, 13 a-outer peripheral surface, 14-rotation shaft, 15-stator, 15 a-inner peripheral surface, 16-1 st bearing, 17-2 nd bearing, 21-housing main body, 21 a-inner peripheral surface, 21 b-protrusion, 22-closure, 23-opening, 24-1 st fitting opening (fitting), 28-2 nd fitting opening (fitting), 31, 32-support shaft, 33-stator main body, 34-1 st resin plate (1 st insulating member), 34 a-inner peripheral surface, 35-2 nd resin plate (2 nd insulating member), 35 a-inner peripheral surface, 41, 43-sleeve, 41a, 43 a-peripheral projection surface, 45, 46-seal ring, 51-heat conducting member, 60-centering jig, 61-shaft portion, 62-centering portion, 63-flange portion, 77-pressing bolt (pressing member), 81-fastening bolt, 100-electric motor, 101-stator housing (1 st housing), 102-1 st bearing housing (2 nd housing), 103-2 nd bearing housing (2 nd housing), 111, 112-opening portion, 113-1 st assembly opening portion (assembly portion), 116-2 nd assembly opening portion (assembly portion).