CN219833917U

CN219833917U - Rotating electrical machine for electric moving body and electric moving body

Info

Publication number: CN219833917U
Application number: CN202321005831.9U
Authority: CN
Inventors: 白木学; 山口真也
Original assignee: Cors (shanghai) Machinery & Equipment Co ltd
Current assignee: Cors (shanghai) Machinery & Equipment Co ltd
Priority date: 2023-04-27
Filing date: 2023-04-27
Publication date: 2023-10-13
Anticipated expiration: 2033-04-27

Abstract

Provided are a rotating electrical machine for an electric mobile body, and an electric mobile body, wherein a grease cover (3) is arranged so as to block most of the planar portions of three planetary gears (4). The grease cover (3) is made of resin, and has a double-wall structure in which an arc-shaped inner wall is formed in the shape of an arc along the outer periphery of the tooth surface of the large-diameter portion of the planetary gear (4) and an outer wall is formed for further reinforcement. The first bearing part is fixed to an internal structure of the coreless motor to support the planetary gears, the carrier (5) is fixed to a bottom surface part of the motor housing, the axial front end is rotatable by the second bearing part in each hole, and each planetary gear (4) is supported at two points of the first bearing part and the second bearing part.

Description

Rotating electrical machine for electric moving body and electric moving body

Technical Field

The present utility model relates to a rotary electric machine for an electric moving body in which a motor suitable for use in an electric moving body such as a wheelchair is incorporated, and an electric moving body.

Background

The wheelchair is gradually propelled and motorized, but the installation position of a motor necessary for the motorized is restricted by the relation with the seat surface. Therefore, miniaturization of the motor has been sought. In order to transmit the rotation of the motor to the wheel, a gear for adjusting the rotation speed is indispensable, and there is a problem in that a volume enough to accommodate the gear unit and the motor needs to be ensured.

In motors for electric vehicles, there is known an in-wheel motor in which a motor is incorporated in a hub of a wheel in consideration of installation space. However, even in the case of an in-wheel motor, if the gear unit and the motor are combined, the motor housing (housing of the rotary electric machine) protrudes in the axial direction.

Prior art literature: JP2021-194037A

Disclosure of Invention

Technical problem to be solved by the utility model

As is clear from fig. 1 to 3 and the like of the prior art documents, the motor housing protrudes greatly toward the seat surface side of the wheelchair. In the case of an electric wheelchair, the space under the seat surface is reduced, and in the case of folding, the protruding portion is also increased.

The present inventors have proposed a motor having a gear unit built therein, and manufactured a rotary electric machine having an outer case with a length in the axial direction substantially equal to the width of the outer case. In this regard, the prior art document described above has not been conceived because it is a motor with a core and a core is built therein. This is based on the assumption that, if the motor is a coreless motor having a cylindrical coil body, the gear unit can be housed in a space without a core.

However, since grease applied to the gear is scattered in association with rotation of the gear, the gear is integrally built in the motor, and therefore, in order to add grease, it is necessary to detach the casing of the rotating electric machine, which causes burden and inconvenience to the user.

Accordingly, a first object of the present utility model is to prevent grease from scattering when a gear unit is incorporated in a motor, thereby avoiding exhaustion of the grease.

Further, since the clearance between the gear unit and the rotor of the motor becomes small, even a small amount of shaft misalignment of the gear structure may cause a failure.

In view of the above, a second object of the present utility model is to prevent the shaft positions of the gears from being shifted in order to prevent contact between the gear structure and the rotor of the motor, particularly the inner yoke, when the gear unit is incorporated in the motor.

Technical scheme for solving technical problems

In order to achieve the first object, a rotary electric machine for an electric moving body according to the present utility model includes a gear unit provided on a fixed shaft of a coreless motor, and the gear unit is housed inside a rotor of a cylindrical coreless motor. A part of the fixed shaft penetrates a hole of an annular body provided in the center of a rotor of the coreless motor, and the annular body rotates by rotation of the rotor. A gear groove is provided on the outer periphery of the annular body, and the gear unit includes an internal gear and a plurality of planetary gears having teeth of small diameter portions engaged with the internal teeth of the internal gear, and the planetary gears are also formed with the gear groove on a large diameter portion on the same axis independently of the small diameter portions, and the teeth of the large diameter portion of the planetary gears are positioned so as to engage with the gear groove of the annular body. In this way, the planetary gear meshed with the annular body rotates by the rotation of the rotor, and the internal gear rotates, and the housing fixed to the internal gear rotates by the rotation of the internal gear. The grease cover and the carrier are provided so that the distal end of the large diameter portion side of the shaft of each planetary gear penetrates through the hole portions of the grease cover and the carrier, and the carrier is fixed to the bottom surface portion of the motor case. At least the tooth surface of the large diameter portion of each planetary gear is coated with grease. The grease cover is positioned on the side of the large diameter part of the bracket, is provided with an arc-shaped inner wall along the outer periphery of the tooth surface of the large diameter part, is configured to cover the majority of the plane part of each planetary gear, and is used for embedding the hole part of the hub and fixing the outer wheel of the shell to rotate.

The interval between the inner wall of the circular arc of the grease cover and the outer periphery of the tooth surface is preferably within 2 mm. The tooth surface outer peripheral surface shows the maximum range of tooth rotation. From the viewpoint of preventing grease scattering, the interval should be reduced as much as possible. The grease cover may cover the planetary gear from both the front and rear sides. The grease cover itself may be made of resin.

The electric moving body according to the present utility model is configured such that the electric moving body is mounted in a hub of an outer wheel by a rotating electric machine.

In order to achieve the second object, a rotary electric machine for an electric moving body according to the present utility model includes a gear unit provided on a fixed shaft of a coreless motor, and the gear unit is housed inside a rotor of a cylindrical coreless motor. The fixed shaft penetrates a hole of an annular body provided in the center of a rotor of the coreless motor, and the annular body rotates by rotation of the rotor. A gear groove is provided on the outer periphery of the annular body. The gear unit includes an internal gear and a plurality of planetary gears having teeth of a small diameter portion engaged with the internal teeth of the internal gear, wherein the planetary gears are also formed with gear grooves on a large diameter portion on the same axis independently of the small diameter portion, and a first bearing portion is disposed on the axis between the teeth of the small diameter portion and the teeth of the large diameter portion. The first bearing portion is fixed to an internal structure of the coreless motor to support the planetary gear, and teeth of a large diameter portion of the planetary gear are positioned so as to mesh with the gear grooves of the annular body. The carrier is fixed to the bottom surface portion of the motor case so that the front end of the shaft of each planetary gear on the large diameter portion side penetrates the hole portion of the carrier, and the shaft front end is rotatably positioned in each hole by the second bearing portion. In this way, the planetary gear meshed with the annular body rotates by the rotation of the rotor, the internal gear rotates, and the housing fixed to the internal gear rotates by the rotation of the internal gear, so that the hole of the hub is fitted into and the outer wheel to which the housing is fixed rotates.

Advantageous effects

According to the first aspect of the present utility model, the grease in the gear unit portion can be prevented from being exhausted in the rotating electrical machine incorporating the gear unit. In addition, there is a secondary effect of silence achieved by the cover.

According to the second aspect of the present utility model, the rotating electrical machine having the built-in gear unit can prevent contact with the rotating portion due to positional displacement of the gears constituting the gear unit. Further, the careful design of the support mechanism has a secondary effect of improving the operability of assembling the gear unit in the coreless motor.

Drawings

Fig. 1 is a perspective view illustrating a case where a cover of a casing is removed and an inner grease cover is disposed in an embodiment of a rotary electric machine according to the present utility model.

Fig. 2 is a perspective view of the grease cover illustrated in fig. 1 as seen from the front side.

Fig. 3 is a perspective view of the grease cover illustrated in fig. 1, as seen from the back side.

Fig. 4 is a perspective view showing a manner of fitting the grease cover from the state illustrated in fig. 1.

Fig. 5 is a plan view of the state illustrated in fig. 4.

Fig. 6 is a perspective view of the stand added in the state illustrated in fig. 1.

Fig. 7 is a perspective view showing an external appearance of the rotary electric machine illustrated in fig. 1.

Fig. 8 is a side cross-sectional view of the illustration of fig. 7.

Fig. 9 is a perspective view illustrating a case of disposing an outer grease cover in the rotating electrical machine illustrated in fig. 1.

Fig. 10 is a perspective view of the grease cover illustrated in fig. 9 as seen from the front side.

Fig. 11 is a perspective view of the grease cover illustrated in fig. 9, as seen from the back side.

Fig. 12 is a perspective view showing a manner of fitting the grease cover from the state illustrated in fig. 9.

Fig. 13 is a plan view of the state illustrated in fig. 12.

Fig. 14 is a perspective view of the external appearance of the rotary electric machine illustrated in fig. 1, as viewed from the opposite side to fig. 7.

Fig. 15 is a cross-sectional view illustrating a support of a planetary gear in a casing in an embodiment of a rotary electric machine of the present utility model.

Fig. 16 is a cross-sectional view illustrating an assembled state of the rotary electric machine illustrated in fig. 15.

Fig. 17 is an outline view of a planetary gear used in the rotary electric machine illustrated in fig. 15.

Fig. 18 is an exploded view illustrating the assembly of the planetary gear of the rotary electric machine illustrated in fig. 15.

Fig. 19 is a partial cross-sectional view illustrating an assembled state in the embodiment of the rotary electric machine of the present utility model.

Fig. 20 is a perspective view of an internal gear of the rotary electric machine illustrated in fig. 19.

Fig. 21 is a side sectional view of the internal gear illustrated in fig. 20.

Fig. 22 is a side view of an electric wheelchair incorporating the rotating electric machine illustrated in fig. 1.

Fig. 23 is an explanatory view of an outer wheel of the electric wheelchair illustrated in fig. 22.

Description of the reference numerals

1 … casing, 2 … fixed shaft, 3 … grease cover, 4 … planetary gear, 5 … carrier, 6 … inner gear, 7 … hub, 8 … rotor part ring, 9 … grease cover, 10 … electric wheelchair, 31 … outer wall, 32 … inner wall, 41 … major diameter portion, 42 … minor diameter portion, 60 … Ma Daji seat, 61 … resin inner tooth forming ring, 62 … metal flange, 63 … screw, 64 … hole, 91 … outer wall, 92 … inner wall, 104 … outer wheel, 108 … rotary motor, 111 … cylindrical coil body, 112 … permanent magnet, 113 … inner yoke, 114 … outer yoke, 116 … gear unit, 121 … bearing portion, 122 … bearing portion.

Detailed Description

Hereinafter, a first embodiment of the present utility model will be described with reference to the drawings.

Fig. 1 shows a state in which a cover of a casing 1 (a casing covering a motor and a gear unit, and a rotating part fitted into a hole in a hub center part of a driving wheel of an electric moving body, as described later) is removed from a rotary electric machine according to a first embodiment of the present utility model. Reference numeral 2 is a fixed shaft, reference numeral 4 is a planetary gear, and in this example, three planetary gears are used. The grease cover 3 is disposed so as to cover a majority of the planar portions of the planetary gears 4.

The grease cover 3 is made of resin, and has a front surface formed as shown in fig. 2 and a rear surface formed as shown in fig. 3. That is, the grease cover 3 has a double-wall structure in which an arc-shaped inner wall 32 is formed in a shape of an arc along the tooth surface outer periphery of the large diameter portion of the planetary gear 4, and an outer wall 31 is formed for further reinforcement.

In this example, the distance between the circular arc of the tooth surface outer periphery of the large diameter portion of the planetary gear 4 and the inner wall 32 is set to be within 2 mm.

The grease cover 3 is attached as shown in fig. 4 and 5. As seen in fig. 1, the planetary gears 4 are provided as a cover so as to cover a large part of the planar portion (a large part substantially excluding the fixed shaft 2, the rotation shafts of the planetary gears 4, and the screw holes).

After the grease cover 3 is mounted, the planetary gears 4 are pressed and positioned by the carrier 5 as in the stator assembly of fig. 6. If the cover of the housing 1 is put on the upper surface, the motor assembly of fig. 7 and 8 is put in a state.

As shown in fig. 8, the planetary gear 4 includes a large diameter portion 41 and a small diameter portion 42, and the large diameter portion 41 is disposed so as to mesh with teeth of the ring-shaped body 8 provided at the center of the rotor of the motor. The ring body 8 is provided with a hole to penetrate the fixed shaft 2, but is not fixed to the fixed shaft 2, and is rotatable as a part of the rotor. And, the teeth of the small diameter portion 42 mesh with the internal teeth of the internal gear 6.

Fig. 9 is a view from the opposite side to fig. 1, showing the grease cover 9 on the inside. As shown in fig. 10 and 11, the grease cover 9 is formed of an arcuate inner wall 92 and a reinforcing outer wall 91 along the outer periphery of the tooth surface of the small diameter portion of the planetary gear 4.

The grease cover 9 is fitted into the housing 1 as shown in fig. 12 and 13. In this example, the interval between the circular arc of the tooth surface outer periphery of the small diameter portion 42 and the inner wall 92 is set to be within 2 mm. In addition, as in the case of the outer side, most of the parts other than the necessary parts such as the penetrating part of the fixed shaft 2 are blocked, and the shaft part of the planetary gear 4 reaching the small diameter part 42 is covered so as to extend along the shaft.

Fig. 14 is viewed from the opposite side to fig. 7.

How the above-described structure operates will be described. The gear unit provided on the stationary shaft 2 of the coreless motor is housed inside the rotor of the cylindrical coreless motor (see fig. 8 and fig. 23 described later). A part of the fixed shaft 2 penetrates a hole of the annular body 8 provided in the center of the rotor, the annular body 8 rotates by the rotation of the rotor, and a gear groove is provided on the outer periphery of the annular body 8, so that the rotation of the rotor is transmitted to the large diameter portion 41 of the planetary gear 4.

The teeth of the small diameter portions of the three planetary gears 4 mesh with the internal teeth of the internal gear 6, and the internal gear 6 rotates by the rotation of the planetary gears 4.

Since the internal gear 6 is fixed to the housing 1, the housing 1 rotates. Then, the hub 7 to which the housing 1 is fixed also rotates, and thus the outer wheel moves.

Hereinafter, a second embodiment of the present utility model will be described with reference to the drawings.

Fig. 15 and 17 show a rotary electric machine according to a second embodiment of the present utility model, and show an internal component arrangement of a casing 1 (a casing covering a motor and a gear unit, as will be described later, and a rotary part fitted into a hole in a hub center part of a driving wheel of an electric moving body. Reference numeral 2 is a fixed shaft, reference numeral 4 is a planetary gear, and in this example, three planetary gears are used. The teeth of these planetary gears 4 are provided with a large diameter portion 41 and a small diameter portion 42.

The small diameter portion 42 is disposed so as to mesh with the internal teeth of the internal gear 6, and the large diameter portion 41 is disposed so as to mesh with the teeth of the outer periphery of the annular body 8 formed to protrude from the rotor center of the coreless motor. The outer shape of the planetary gear 4 is shown in fig. 17. In this example, the tooth surface is a helical gear.

A base portion 120 of the motor is formed in the housing 1, and is configured to be able to house the large diameter portion 41 therein. Reference numerals 121, 122 are bearing portions (bearings are used in this example).

Referring to fig. 18, the assembly is described, and the small diameter portions 42 of the three planetary gears 4 are disposed in the housing 1 including the internal gear 6 (not shown in fig. 18) so as to penetrate through the holes 123 of the base portion 120 in the housing and mesh with the internal teeth of the internal gear 6. The large diameter portion 41 side is then pressed by the bracket 5 via the grease cover 3. The bracket 5 is fixed to the bottom of the housing 1. When the shaft end of the large diameter portion 41 side of the planetary gear 4 passes through the holes 51 of the carrier 5, the bearing portions 122 on the inner side of the holes 51 are interposed therebetween, thereby forming one support point for the planetary gear 4.

In this example, the planetary gear 4 includes a bearing portion 121 on the shaft between the large diameter portion 41 and the small diameter portion 42, and the bearing portion 121 is fitted in the hole 123 and is in close contact with the hole, thereby forming the other support point for the planetary gear 4. In this way, if there are at least two or more points in the axial direction of the planetary gear 4, the manner and the number of the bearing portions to be provided are not limited. That is, by supporting the support at two points, axial displacement can be suppressed.

The large diameter portion 41 of the planetary gear 4 is disposed so as to mesh with teeth of the ring body 8 provided at the center of the rotor of the motor, and the ring body 8 is provided with a hole so as to pass through the fixed shaft 2, but is not fixed to the fixed shaft 2, so as to be rotatable, and rotates as a part of the rotor.

How the above-described structure operates will be described. The gear unit provided on the stationary shaft 2 of the coreless motor is housed inside the rotor of the cylindrical coreless motor. A part of the fixed shaft 2 penetrates a hole of the annular body 8 provided in the center of the rotor, the annular body 8 rotates by the rotation of the rotor, and a gear groove is provided on the outer periphery of the annular body 8, so that the rotation of the rotor is transmitted to the large diameter portion 41 of the planetary gear 4.

Since each planetary gear 4 is supported by two points, positioning accuracy is high, assembly is facilitated, and failure due to contact with the rotor during operation can be prevented.

Since the internal gear 6 is fixed to the housing 1, the housing 1 rotates. Then, the hub 7 to which the housing 1 is fixed also rotates, and thus the driving wheel moves.

A third embodiment of the present utility model will be described below with reference to the drawings.

Fig. 19 is a partial cross-sectional view illustrating an internal structure of a rotary electric machine according to a third embodiment of the present utility model, and fig. 20 and 21 are views illustrating an internal gear incorporated in the rotary electric machine.

Inside the housing 1 (a case covering the motor and the gear unit, as will be described later, and being a rotating portion fitted into a hole in a hub center portion of an outer wheel of the electric moving body, the same applies hereinafter), reference numeral 2 is a fixed shaft, reference numeral 4 is a planetary gear, and in this example, three planetary gears are used. The teeth of these planetary gears 4 are provided with a large diameter portion 41 and a small diameter portion 42.

The small diameter portion 42 is disposed so as to mesh with the internal teeth of the internal gear 6, and the large diameter portion 41 is disposed so as to mesh with the teeth of the outer periphery of the annular body 8 formed to protrude from the rotor center of the coreless motor.

The internal gear 6 is connected to an internal tooth forming ring 61 made of resin (fiber reinforced plastic in this example) and a flange 62 made of metal (steel in this example) by screws 63 through mounting holes 64.

The large diameter portion 41 of the planetary gear 4 is disposed so as to mesh with teeth of the ring body 8 provided at the center of the rotor of the motor, and the ring body 8 is provided with a hole so as to pass through the fixed shaft 2, but is not fixed to the fixed shaft 2, and thereby is rotatable as a part of the rotor.

Since the internal teeth of the internal gear 6 are made of resin, occurrence of rolling noise made of metal is suppressed by toughness of the resin when meshing with the metal teeth, and thus noise reduction can be achieved.

(application to electric wheelchair)

Fig. 22 shows an electric wheelchair. In this example, the drive wheels incorporating the rotary motor are shown as double drive wheels disposed on both sides of the seat surface of the wheelchair, but the number of drive wheels is not limited.

The figure is a side view of the wheelchair 10. The frame of the electric wheelchair 10 is formed into a chair-type rectangular box shape to form a wheelchair main body 101. A push handle 103 extends from the upper part of the rear vertical tube 102 of the wheelchair body 101 when viewed from the side of the wheelchair 10, so that a caregiver can push by hand. An outer wheel 104 of a rear wheel having a large diameter is attached to a lower end portion thereof, and the outer wheel 104 is movable by rotation of the outer wheel 104 by hand shaking by a hand rim 105 provided on an outer side surface of the outer wheel 104. A small diameter caster 107 is provided at the lower end of the front vertical tube 106, so that steering is possible. The shaft portion of the outer wheel 104 of the electric wheelchair 10 is supported by the outer wheel 104 and the bearing, and is driven by the rotating motor 108. The shaft portion of the outer wheel 104 is a fixed shaft 2 of the rotating motor 108, and the fixed shaft 2 is fixed to the wheelchair main body at a position below the seat surface. In order to drive such an electric wheelchair, an operation lever 110 is attached to the armrest 109, and the operation lever is driven to move forward, backward, leftward, and rightward.

The rotary electric machine 108 incorporates a gear unit in the coreless motor, specifically, fig. 8, but the coreless motor employed in the present utility model will be described with reference to fig. 23 for the sake of simplifying the relationship between the motor side and the gear unit side. Since fig. 23 is used to explain the coreless motor incorporated in the gear unit, the content of the gear unit is omitted (see fig. 8 for details).

The housing 1 to which the rotating electric machine 108 is fixed is fitted in the center of the hub 7 of the outer ring 104. Thereby, the rotation of the rotary motor 108 rotates the outer wheel 104. A fixed shaft 2 penetrates the center of the housing 1. The fixed shaft 2 is supported by a bearing with respect to the housing 1, whereby the housing 1 is rotatable with respect to the fixed shaft 2. The gear unit 116 is located inside the housing 1, and the inner yoke 113 of the coreless motor is cylindrically positioned so as to surround the gear unit 116. The inner yoke 113 is integrally provided with a permanent magnet 112 directly or indirectly. A non-rotating cylindrical coil body 111 is arranged with a gap from the permanent magnet 112, and the cylindrical coil body 111 is fixed to the fixed shaft by a coil body support portion 115. Since the outer yoke 114 is arranged cylindrically on the outside of the cylindrical coil body 111, the inner yoke 113, the permanent magnet 112, the cylindrical coil body 111, and the outer yoke 114 are arranged in this order concentrically with the fixed shaft 2. The inner yoke 113, the outer yoke 114, and the permanent magnet 112 constitute a rotor, and transmit rotation to the gear unit 116.

The housing 1 is rotated via the gear unit 116, and the hub 7 inserted into the hole of the outer ring 104 and fixed to the outer ring side surface portion is able to suppress the gear unit 116 from protruding from the outer ring 104 in accordance with the amount by which the gear unit 116 is fitted into the inner side of the inner yoke 113 of the coreless motor, and the axial length of the housing 1 of the rotary electric machine is substantially equal to the outer ring 104. In this example, the difference between the axial length of the housing 1 and the outer wheel thickness is up to within 5 cm. Since the coreless motor is lighter without the iron core, the operability for the wheelchair user is improved, and the conveyance is easier for the nursing person.

Industrial applicability

According to the present utility model, the burden on the user and the caregiver of the electric wheelchair can be reduced. The present utility model is not limited to electric wheelchairs, and can be applied to electric bicycles, so-called electric vehicles, and the like, and can be widely popularized to society.

Claims

1. A rotary electric machine for an electric moving body, characterized in that,

a gear unit is arranged on the fixed shaft of the coreless motor, and is accommodated inside the rotor of the cylindrical coreless motor,

a part of the fixed shaft penetrates a hole of an annular body provided in the center of a rotor of the coreless motor, the annular body rotates by the rotation of the rotor, a gear groove is provided on the outer periphery of the annular body,

the gear unit is provided with an internal gear and a plurality of planetary gears with teeth of small diameter parts meshed with the internal teeth of the internal gear,

the planet gear is also formed with a gear groove on a large diameter portion on the same axis independently of the small diameter portion,

the teeth of the large diameter portion of the planetary gear are positioned in meshing engagement with the gear grooves of the ring body,

the planetary gear engaged with the ring body rotates by the rotation of the rotor, thereby rotating the internal gear, and the housing fixed to the internal gear rotates by the rotation of the internal gear,

the grease cover and the carrier are provided so that the front end of the shaft of each of the planetary gears on the large diameter portion side penetrates through the hole portions of the grease cover and the carrier, the carrier is fixed to the bottom surface portion of the motor housing,

at least the tooth surface of the large diameter portion of each of the planetary gears is coated with grease,

the grease cover is positioned on the large diameter portion side of the carrier, has an arc-shaped inner wall along the outer periphery of the tooth surface of the large diameter portion, is arranged so as to cover a large part of the planar portion of each of the planetary gears,

the outer wheel with the outer shell is rotated by embedding and fixing the hole of the hub.

2. The rotating electric machine for an electric moving body according to claim 1, wherein,

the interval between the arc-shaped inner wall of the grease cover and the outer periphery of the tooth surface is within 2 mm.

3. A rotary electric machine for an electric moving body, characterized in that,

the fixed shaft penetrates a hole of an annular body arranged at the center of a rotor of the coreless motor, the annular body rotates by the rotation of the rotor, a gear groove is arranged at the periphery of the annular body,

the planetary gear is also formed with a gear groove on a large diameter portion on the same axis independently of the small diameter portion, a first bearing portion is arranged on the axis between the teeth of the small diameter portion and the teeth of the large diameter portion, the first bearing portion is fixed to an internal structure of the coreless motor to support the planetary gear,

the teeth of the large diameter portion of the planetary gear are positioned so as to mesh with the gear grooves of the ring body, the carrier is provided so that the front end of the shaft of each of the planetary gears on the large diameter portion side penetrates a hole portion of the carrier, the carrier is fixed to the bottom surface portion of the motor housing, the shaft front end is positioned so as to be rotatable by the second bearing portion in each hole,

the planetary gear engaged with the annular body rotates by rotation of the rotor, so that the internal gear rotates, and the housing fixed to the internal gear rotates by rotation of the internal gear, so that the hole of the hub is fitted into and fixed to the outer gear of the housing.

4. An electric moving body, characterized in that the electric moving body according to any one of claims 1 to 3 is constituted by embedding a rotating electric machine in the center of the hub.