WO2023171707A1 - Motor and vehicle - Google Patents

Abstract

The rotor of this motor has a rim, a first cover member, a second cover member, and a rib member. The first cover member is disposed at one axial end of a cylindrical portion of the rim. The rib member includes a plurality of first rib members and/or a plurality of second rib members. The first rib members connect one axial side of the cylindrical portion and a peripheral plate part on one axial side of the rim. The second rib members connect the other axial side of the cylindrical portion and a peripheral plate part on the other axial side of the rim.

Description

motor, vehicle

The present invention relates to motors and vehicles.

Conventionally, in-wheel motors are known in which tires are mounted on a cylindrical rim placed on the outer periphery of a rotor. For example, the rotor of an in-wheel motor is placed outside the stator. A magnetically permeable ring is fixed to the inner peripheral surface of the rim of the rotor. A magnet is attached to the inner peripheral surface of the magnetically permeable ring. Moreover, disk-shaped covers are screwed to both side openings of the rim. (Refer to China Patent Application Publication No. 109995179)

China Patent Application Publication No. 109995179

The fixing of the yoke to the rim requires strength that can at least withstand the rotational torque of the rotor. However, if the yoke is integrally molded with the rim, there is a risk that sufficient strength against rotational torque may not be obtained depending on the output of the motor. Therefore, a means for more stably fixing the yoke is desired.

Additionally, a tire is attached to the rim of the motor. Therefore, a large load and impact are applied to the rim from the tire bead. Therefore, further improvement in the rigidity of the rim is desired.

Furthermore, in the above-mentioned in-wheel motor, it is necessary to attach covers to both openings of the rim. Therefore, the number of working steps for the motor increases, making it difficult to improve the productivity of the motor.

The first objective of the present invention is to improve the rigidity of the rim. Further, a second object of the present invention is to stably fix the yoke to the rim, and a third object is to improve the productivity of the motor.

To achieve the first goal described above, an exemplary motor of the present invention includes a rotor and a stator. The rotor has a magnet surrounding a central axis extending in the axial direction, and is rotatable about the central axis. The stator is arranged radially inward than the magnet and surrounds the central axis. The rotor includes a rim, a first cover member, and a rib member. The rim has a cylindrical portion surrounding the magnet and the stator and extending in the axial direction. The first cover member extends in a direction intersecting the axial direction and is disposed at one axial end of the cylindrical portion. The rib member extends in a radial direction. The rim further includes a pair of side wall portions and a pair of circumferential plate portions. The side wall portion has an annular shape surrounding the central axis, and extends radially outward from the cylindrical portion. The pair of side wall portions face each other in the axial direction. The pair of circumferential plate portions have an annular shape surrounding the central axis, and extend away from each other in the axial direction from the radially outer end portions of the respective side wall portions. The rib member includes at least one of a plurality of first rib members and a plurality of second rib members. The first rib member connects one axial side of the cylinder portion and the circumferential plate portion on one axial side. The second rib member connects the other axial side of the cylinder portion and the peripheral plate portion on the other axial side.

To achieve the second goal described above, an exemplary motor of the present invention includes a rotor and a stator. The rotor has a magnet surrounding a central axis extending in the axial direction, and is rotatable about the central axis. The stator is arranged radially inward than the magnet and surrounds the central axis. The rotor further includes a rim, a yoke, and an arrangement structure. The rim has a cylindrical portion. The cylindrical portion surrounds the magnet and the stator and extends in the axial direction. The yoke is disposed on a radially inner surface of the cylindrical portion, surrounds the stator, and holds the magnet on the radially inner surface. The arrangement structure includes at least one of a first radial arrangement structure, a second radial arrangement structure, a first axial arrangement structure, and a second axial arrangement structure. The first radial arrangement structure includes a first yoke recess and a first cylindrical protrusion. The first yoke recess is disposed at a radially outer end of the yoke and is recessed radially inward. The first cylindrical protrusion protrudes radially inward from the radially inner end of the cylindrical portion and is disposed within the first yoke recess. The second radial arrangement structure includes a first cylinder-side recess and a first yoke protrusion. The first cylindrical recess is disposed at a radially inner end of the cylindrical portion and is recessed radially outward. The first yoke protrusion protrudes radially outward from a radially outer surface of the yoke and is disposed within the first cylinder-side recess. The first axial arrangement structure includes a second yoke recess and a second cylindrical protrusion. The second yoke recess is disposed at an axial end of the yoke and is recessed in the axial direction. The second cylindrical protrusion protrudes in the axial direction from a portion of the cylindrical portion that axially faces the yoke, and is disposed within the second yoke recess. The second axial arrangement structure includes a second cylinder-side recess and a second yoke protrusion. The second cylindrical recess is arranged in a portion of the cylindrical portion that faces the yoke in the axial direction, and is recessed in the axial direction. The second yoke protrusion protrudes in the axial direction from the axial end of the yoke and is disposed within the second cylinder side recess.

To achieve the third goal described above, an exemplary motor of the present invention includes a rotor and a stator. The rotor has a magnet surrounding a central axis extending in the axial direction, and is rotatable about the central axis. The stator is arranged radially inward than the magnet and surrounds the central axis. The rotor includes a rim, a first cover member, a second cover member, and a first peripheral wall. The rim has a cylindrical portion. The cylindrical portion surrounds the magnet and the stator and extends in the axial direction. The first cover member extends in a direction intersecting the axial direction and is connected to one axial end of the cylindrical portion. The second cover member extends in a direction intersecting the axial direction and is connected to the other axial end of the cylindrical portion. The first peripheral wall part extends in the circumferential direction while expanding in the axial direction from one part to the other of the other axial end part of the cylinder part and the radial outer end part of the second cover member. . The first circumferential wall portion is disposed radially outward from the other portion and is radially aligned with the other portion. The rim further includes a pair of side wall portions, a pair of circumferential plate portions, and a pair of rim flanges. The side wall portion has an annular shape surrounding the central axis, and extends at least radially outward from the cylindrical portion. The pair of side wall portions face each other in the axial direction. The pair of circumferential plate portions respectively extend away from each other in the axial direction from the radially outer end portions of the respective side wall portions. The pair of rim flanges each expand radially outward from one axial end of the peripheral plate on one axial side and the other axial end of the peripheral plate on the other axial side. The rim and the first cover member are configured as a single member.

Further, an exemplary vehicle of the present invention includes any of the above motors.

Further features and advantages of the present invention will be made more clear by the embodiments described below.

According to the exemplary motor and vehicle that meet the first objective of the present invention, the rigidity of the rim can be improved. Furthermore, according to the exemplary motor and vehicle that meet the second objective, the yoke can be stably fixed to the rim. Furthermore, according to the exemplary motor and vehicle that meet the third objective, productivity of the motor can be improved.

FIG. 1 is a sectional view showing an example of the configuration of a motor. FIG. 2 is a conceptual diagram showing an example of the configuration of a vehicle equipped with a motor. FIG. 3A is a side view showing a configuration example of a motor on one side in the axial direction. FIG. 3B is a side view showing a configuration example of the motor on the other axial side. FIG. 4 is an enlarged view showing an example of the configuration near the connecting portion between the first rib member and the first circumferential plate portion. FIG. 5A is an enlarged view showing an example of the configuration of the first side wall portion at the connection portion with the first rib member. FIG. 5B is an enlarged view showing a configuration example of the first side wall portion at a portion circumferentially away from the connection portion with the first rib member. FIG. 6A is a side view showing an example of the arrangement of the first rib member and the second rib member in the circumferential direction. FIG. 6B is a side view showing another arrangement example of the first rib member and the second rib member in the circumferential direction. FIG. 7 is a perspective view showing an example of the configuration of the yoke. FIG. 8A is a cross-sectional view showing a configuration example of the first radial arrangement structure. FIG. 8B is a cross-sectional view showing a configuration example of the second radial arrangement structure. FIG. 8C is a cross-sectional view showing a configuration example of the first axial arrangement structure. FIG. 8D is a cross-sectional view showing a configuration example of the second axial arrangement structure. FIG. 9A is a side view showing an example of a first herringbone shape. FIG. 9B is a side view showing an example of the first zigzag shape. FIG. 10A is a side view showing an example of the second herringbone shape. FIG. 10B is a side view showing an example of the second zigzag shape. FIG. 11A is a side view showing an example of the arrangement of the recessed portion of the yoke with respect to the first rib member. FIG. 11B is a side view showing an example of the arrangement of the recessed portion of the yoke with respect to the second rib member. FIG. 12A is a side view showing an example of the arrangement of the protruding portion of the yoke with respect to the first rib member. FIG. 12B is a side view showing an example of the arrangement of the protruding portion of the yoke with respect to the second rib member. FIG. 13 is a sectional view showing a first configuration example of a connecting portion between the rim and the second cover member. FIG. 14 is a cross-sectional view showing an example of the configuration of the caulking portion of the first cylinder side peripheral wall portion. FIG. 15 is a sectional view showing a second configuration example of a connecting portion between the rim and the second cover member. FIG. 16 is a cross-sectional view showing an example of the structure of the caulking portion of the cover-side peripheral wall portion. FIG. 17 is a sectional view showing a third configuration example of a connecting portion between the rim and the second cover member. FIG. 18 is a cross-sectional view showing another example of the configuration of the crimped portion of the cover-side peripheral wall portion. FIG. 19A is a cross-sectional view showing a first modification of the connection portion between the rim and the second cover member. FIG. 19B is a sectional view showing a second modification of the connection portion between the rim and the second cover member. FIG. 19C is a sectional view showing a third modification of the connection portion between the rim and the second cover member.

Exemplary embodiments will be described below with reference to the drawings.

Note that in this specification, in the motor 100, a direction parallel to the central axis CA is referred to as an "axial direction Da." Of the axial directions Da, the direction from the second cover member 2 to the first cover member 1, which will be described later, is called "one axial direction Da1", and the direction from the first cover member 1 to the second cover member 2 is called "axial direction". The other side is called "Da2".

Further, the direction perpendicular to the central axis CA is referred to as the "radial direction Dd", and the direction of rotation around the central axis CA is referred to as the "circumferential direction Dr". In the radial direction Dd, the direction approaching the central axis CA is called "radially inward Di", and the direction away from the central axis CA is called "radially outward Do".

Furthermore, in any given component, among the predetermined directions, the direction from the center of the component to the end is called the predetermined direction outward, and the direction from the end of the component to the center is called the predetermined direction inward. . For example, in the axial direction Da, the direction from the center of the component to the axial end is called "axially outward," and the direction from the axial end of the component to the center is called "axially inward." ” is called.

In addition, in this specification, "annular" refers to a shape that is continuous and continuous over the entire area in the circumferential direction Dr centered on the central axis CA, as well as a shape that is continuous without any break over the entire area in the circumferential direction Dr centered on the central axis CA. Includes a shape that has one or more cuts in a part. It also includes a shape that draws a closed curve on a curved surface that is centered around the central axis CA and intersects with the central axis CA.

In addition, in terms of the positional relationship between one of the directions, lines, and planes and the other, "parallel" refers not only to the state in which they do not intersect at all no matter how far they extend, but also to the state in which they are substantially parallel. include. Furthermore, "perpendicular" and "perpendicular" each include not only a state in which the two intersect with each other at 90 degrees, but also a state in which they are substantially perpendicular and a state in which they are substantially orthogonal. That is, "parallel", "perpendicular", and "perpendicular" each include a state in which there is an angular shift in the positional relationship between the two to the extent that it does not depart from the gist of the present invention.

Note that these are names used merely for explanation, and are not intended to limit the actual positional relationships, directions, names, etc.

<1. Motor 100>
FIG. 1 is a cross-sectional view showing a configuration example of a motor 100. FIG. 2 is a conceptual diagram showing a configuration example of a vehicle 200 on which the motor 100 is mounted. The motor 100 of this embodiment is a so-called in-wheel motor, and is mounted on the vehicle 200.

The vehicle 200 in FIG. 2 is an electric two-wheeled vehicle. Vehicle 200 includes motor 100. The vehicle 200 further includes a front wheel 201, a rear wheel 202, a vehicle body 203, a steering wheel 204, an ECU (electronic control unit) 205, and a battery 206. Front wheels 201 and rear wheels 202 are rotatably attached to a vehicle body 203. Motor 100 is arranged at rear wheel 202. The rear wheel 202 includes a motor 100 and tires 2021. The tire 2021 is a tubeless tire that is attached to the rim 3 of the motor 100, which will be described later, and is configured together with the rim 3. A handle 204 is attached to the front of the vehicle body 203. ECU 205 is arranged inside vehicle body 203. ECU 205 is a control device that controls each component of vehicle 200, and controls motor 100 and battery 206, for example. Battery 206 is arranged inside vehicle body 203. Battery 206 is a rechargeable and dischargeable secondary battery, and supplies power to motor 100 and ECU 205, for example. In this embodiment, the battery 206 is a lithium ion battery.

In the vehicle 200 of this embodiment, the rigidity of the rim 3 (particularly the circumferential plate portion 33) of the motor 100 can be improved, as will be described later. Further, the yoke 5, which will be described later, can be stably fixed to the rim 3. Further, the productivity of the motor 100 can be improved. Note that the illustration of this embodiment does not exclude a configuration in which the motor 100 is mounted on a vehicle other than an electric two-wheeled vehicle.

As shown in FIG. 1, the motor 100 includes a shaft 101, a stator 102, a stator holder 103, and a rotor 104.

<1-1. Shaft 101>
The shaft 101 has a cylindrical shape and extends in the axial direction Da along the central axis CA. In the present embodiment, the shaft 101 is a fixed shaft, and is fixed non-rotatably to the vehicle body 203 of the vehicle 200, for example.

<1-2. Stator 102>
The stator 102 is disposed radially inward Di from the magnets 6, which will be described later, of the rotor 104, and surrounds the central axis CA. As mentioned above, the motor 100 includes the stator 102. The stator 102 faces the magnet 6 in the radial direction Dd. Stator 102 includes a stator core 1021, an insulator 1022, and a plurality of coil parts 1023. The stator core 1021 is formed using a magnetic material, and in this embodiment is a laminate in which electromagnetic steel sheets are laminated in the axial direction Da. The insulators 1022 are made of an electrically insulating material such as resin, and are arranged at one axial end and the other axial end of the stator core 1021. Coil portion 1023 is arranged on stator core 1021 via insulator 1022. When a drive current is supplied to each coil portion 1023, the stator 102 is excited and drives the rotor 104 to rotate.

<1-3. Stator holder 103>
Stator holder 103 holds stator 102. Stator holder 103 has an inner cylinder part 1031, a holder cylinder part 1032, and a connecting part 1033. The inner cylindrical portion 1031 has a cylindrical shape that surrounds the central axis CA and extends in the axial direction Da, and is fixed to the radially outer surface of the shaft 101. The holder cylinder part 1032 is arranged radially outward Do from the inner cylinder part 1031. The holder cylinder portion 1032 extends in the axial direction Da surrounding the central axis CA, and holds the stator core 1021 on its radially outer surface. The connecting part 1033 connects the inner cylinder part 1031 and the holder cylinder part 1032. The connecting portion 1033 extends radially outward Do from the radially outer surface of the inner cylinder portion 1031. A radially outer portion of the connecting portion 1033 is connected to the holder cylinder portion 1032.

<1-4. Rotor 104>
The rotor 104 is rotatable around a central axis CA extending in the axial direction Da. As mentioned above, the motor 100 includes a rotor 104. In this embodiment, the rotor 104 is rotatable relative to the shaft 101. The rotor 104 includes a first cover member 1, a second cover member 2, a rim 3, a rib member 4, a yoke 5, a magnet 6, and an arrangement structure F.

<1-4-1. Rim 3>
The rim 3 has a cylindrical shape surrounding the central axis CA. A tire 2021 (see FIG. 2) is mounted on the rim 3. The rim 3 includes a cylindrical portion 31 , a pair of side wall portions 32 , a pair of circumferential plate portions 33 , and a pair of rim flanges 34 .

The cylindrical portion 31 surrounds the magnet 6 and the stator 102 and extends in the axial direction Da. As described above, the rim 3 has the cylindrical portion 31, and the rotor 104 has the rim 3. The cylindrical portion 31 holds the yoke 5.

The cylindrical portion 31 has an annular groove portion 310 surrounding the central axis CA. The groove portion 310 is arranged on the radially inner surface of the cylindrical portion 31, is recessed radially outward Do, and extends in the circumferential direction Dr. At least the radially outer Do side of the yoke 5 is arranged in the groove portion 310 . In this embodiment, the entire yoke 5 is housed in the groove 310, and the radially inner end of the yoke 5 is located at the same radial position as the radially inner end of the cylindrical portion 31.

Further, as will be described later, the cylindrical portion 31 has at least one of a first cylindrical protrusion 313, a first cylindrical recess 314, a second cylindrical protrusion 315, and a second cylindrical recess 316. .

The side wall portion 32 has an annular shape surrounding the central axis CA, and extends from the cylindrical portion 31 at least radially outward Do. The pair of side wall portions 32 face each other in the axial direction Da. As mentioned above, the rim 3 has a pair of side walls 32. The pair of side wall sections 32 includes a first side wall section 321 and a second side wall section 322. The second side wall portion 322 is arranged on the other side Da2 of the first side wall portion 321 in the axial direction. The first side wall portion 321 and the second side wall portion 322 each have an annular shape surrounding the central axis CA, and extend from the radially outer surface of the cylindrical portion 31 at least radially outwardly Do. In this embodiment, the first side wall portion 321 widens in one axial direction Da1 as it goes radially outward Do. The second side wall portion 322 widens toward the other axial direction Da2 as it goes radially outward Do.

The pair of circumferential plate portions 33 have an annular shape surrounding the central axis CA, and extend away from each other in the axial direction Da from the radially outer end of each side wall portion 32. As described above, the rim 3 has a pair of circumferential plate portions 33. The circumferential plate portion 33 is a so-called bead seat. A bead (not shown) of a tire 2021 mounted on the rim 3 is arranged on each circumferential plate portion 33 .

The pair of circumferential plate portions 33 includes a first circumferential plate portion 331 and a second circumferential plate portion 332. The first circumferential plate portion 331 and the second circumferential plate portion 332 each have a cylindrical shape surrounding the central axis CA. The first circumferential plate portion 331 extends from the radially outer end of the first side wall portion 321 in one direction Da1 in the axial direction. The second circumferential plate portion 332 is disposed on the other axial side Da2 from the first circumferential plate portion 331, and extends from the radially outer end of the second side wall portion 322 toward the other axial side Da2.

The pair of rim flanges 34 extend at least radially outward Do from one axial end of the peripheral plate 33 on one Da1 side in the axial direction and the other axial end of the peripheral plate 33 on the other Da2 side in the axial direction. spread. As mentioned above, the rim 3 has a pair of rim flanges 34. The pair of rim flanges 34 includes a first rim flange 341 and a second rim flange 342. The first rim flange 341 and the second rim flange 342 each have an annular shape surrounding the central axis CA.

The first rim flange 341 extends at least radially outward Do from one axial end of the first circumferential plate portion 331. As mentioned above, the rim 3 has a pair of rim flanges 34. The first rim flange 341 has an annular wall portion 3411 and a cylindrical collar portion 3412. The wall portion 3411 extends from one axial end portion of the first circumferential plate portion 331 at least radially outward Do. The flange portion 3412 extends from the radially outer end of the wall portion 3411 in one direction Da1 in the axial direction.

The second rim flange 342 is disposed on the other axial end Da2 of the first rim flange 341, and extends at least radially outward Do from the other axial end of the second circumferential plate portion 332. The second rim flange 342 has an annular wall portion 3421 and a cylindrical collar portion 3422. The wall portion 3421 extends at least radially outward Do from the other axial end of the second circumferential plate portion 332. The flange portion 3422 extends from the radially outer end of the wall portion 3421 toward the other axial direction Da2.

Preferably, the thickness Ws of the side wall portion 32 and the thickness Wb of the peripheral plate portion 33 are thicker than the thickness Wf of the rim flange 34 (see FIG. 1). Specifically, the thickness Ws of the side wall portion 32 refers to, for example, the distance between the end surface of each side wall portion 32 on the one axial side Da1 side and the end surface on the other axial side Da2 side. The thickness Wb of the circumferential plate portion 33 refers to the distance between the radially inner surface and the radially outer surface of each circumferential plate portion 33, for example. The thickness Wf of the rim flange 34 refers to, for example, the distance between one axial end surface and the other axial end surface of the wall portions 3411, 3421 in each rim flange 34. When the tire 2021 is mounted on the rim 3, a large load is applied to the side wall portion 32 and the circumferential plate portion 33. Therefore, by setting Ws>Wf and Wb>Wf, the side wall portion 32 and the peripheral plate portion 33 can be made thicker. Therefore, their rigidity can be improved.

<1-4-2. First cover member 1>
The first cover member 1 has an annular shape surrounding the shaft 101 and is disposed at one end of the rim 3 in the axial direction. As described above, the rotor 104 includes the first cover member 1. The first cover member 1 extends in a direction intersecting the axial direction Da (for example, in the radial direction Dd) and is disposed at one axial end of the cylindrical portion 31 .

In this embodiment, the rim 3 and the first cover member 1 are configured as a single member. Specifically, the entire rim 3 (that is, the cylinder portion 31, the pair of side walls 32, the pair of peripheral plate portions 33, and the pair of rim flanges 34) and the first cover member 1 are integrated as a single member. configured. Thereby, the number of parts of the rotor 104 and the manufacturing process of the rim 3 and the first cover member 1 can be reduced. Therefore, the manufacturing cost of the motor 100 can be reduced and its productivity can be improved. Moreover, since there is no gap between each component of the rim 3, air leakage of the tubeless tire composed of the rim 3 and the tire 2021, for example, can be reliably prevented. However, this example does not exclude a configuration in which the rim 3 and the first cover member 1 are separate bodies.

Preferably, a lightweight metal material is used for the rim 3 and the first cover member 1. For example, in this embodiment, the material of the single member mentioned above is aluminum or an aluminum alloy. In this way, the weight of the motor 100 can be reduced compared to when the rim 3 and the first cover member 1 are made of iron (or its alloy), stainless steel, or the like.

Also, preferably, the above-mentioned single member is a cast molded product. For example, in this embodiment, the rim 3 and the first cover member 1 are formed by aluminum die-casting. For example, by casting the yoke 5 while being installed in a mold, the yoke 5 can be disposed integrally with the cylindrical portion 31 without being affected by the shape of the yoke 5. In other words, the degree of freedom in designing the shape of the yoke 5 can be improved. Furthermore, compared to the case where the single member mentioned above is a press-molded product, the degree of freedom in designing the shape of the rim 3 and the first cover member 1 is improved, and the strength of the rim 3 and the first cover member 1 is improved. It's easy to do. However, the above-mentioned examples do not exclude a configuration in which the above-mentioned single member is not a cast molded product.

Next, the first cover member 1 includes a first disk portion 11, a first inclined wall portion 12, a first bearing holder 13, a first bearing 131, a first end cap 14, and a first cover rib 15. , has.

The first disk portion 11 has an annular shape surrounding the shaft 101. The first disk portion 11 is disposed on one axial direction Da1 from the stator 102, and extends in a direction intersecting the axial direction Da (for example, in a radial direction Dd).

The first inclined wall portion 12 is annular and extends from the radially outer end of the first disk portion 11 to the other axial direction Da2 and the radially outer side Do. A radially outer end of the first inclined wall portion 12 is connected to one axial end of the cylindrical portion 31 . Note that the first inclined wall portion 12 may be omitted, and in this case, the radially outer end of the first disk portion 11 is connected to one axial end of the cylinder portion 31.

The first bearing holder 13 has a cylindrical shape surrounding the shaft 101 and is arranged at the radially inner end of the first disk portion 11. The first bearing holder 13 holds a first bearing 131 and rotatably supports the shaft 101 via the first bearing 131.

The first end cap 14 is disposed on the inner circumferential surface of the first bearing holder 13 on one side Da1 of the first bearing 131 in the axial direction. The first end cap 14 has an annular shape surrounding the shaft 101 and covers between the shaft 101 and the first bearing holder 13. The first end cap 14 can prevent dust, liquid, etc. from entering the inside of the motor 100 via the space between the shaft 101 and the first bearing holder 13.

The first cover rib 15 is arranged on the axial end face of the first cover member 1 and extends in the radial direction Dd. As described above, the rotor 104 has the first cover rib 15. The first cover rib 15 may be singular or may be arranged in plurality in the circumferential direction Dr. In this embodiment, the first cover rib 15 protrudes from the other axial end surface of the first disk portion 11 in the other axial direction Da2 and extends in the radial direction Dd. A radially outer end portion of the first cover rib 15 is connected to the first inclined wall portion 12 . Note that, without being limited to the example of this embodiment, the first cover rib 15 may be arranged on one axial end surface of the first cover member 1, or on one axial end surface and the other axial end surface of the first cover member 1. It may be arranged on both end faces. The first cover rib 15 can reinforce the first cover member 1. Further, the first cover rib 15 may be omitted without being limited to the example of this embodiment.

<1-4-3. Second cover member 2>
The second cover member 2 has an annular shape surrounding the shaft 101 and is connected to the other end of the rim 3 in the axial direction. As mentioned above, the rotor 104 includes the second cover member 2. The second cover member 2 extends in a direction intersecting the axial direction Da (for example, in the radial direction Dd) and is disposed at the other axial end of the cylindrical portion 31 .

Preferably, as shown in FIG. 1, the second cover member 2 is disposed closer to the other axial Da2 than the rim flange 34 (that is, the second rim flange 342) on the other axial Da2 side. That is, the second cover member 2 is disposed on the other axial side Da2 of the rim 3 as a whole. In this way, the degree of freedom in designing the motor 100 can be improved. For example, the axial width between the pair of rim flanges 34 is determined according to the size of the tire 2021 mounted on the rim 3, and cannot be set arbitrarily. Therefore, if the second cover member 2 is disposed on one side of the axial direction Da1 than the rim flange 34 (second rim flange 342) on the other side of the axial direction Da2, the axial width of the rotor 104 is the width between the pair of rim flanges 34. (in other words, the size of the tire 2021 mounted on the rim 3). On the other hand, by arranging the second cover member 2 closer to the other axial Da2 than the rim flange 34 on the other axial Da2 side, the axial width of the rotor 104 can be arbitrarily set without being subject to the above-mentioned limitations.

The second cover member 2 includes a second disk portion 21, a second inclined wall portion 22, a flange portion 23, a second bearing holder 24, a second bearing 241, a second end cap 25, and a second cover rib. 26.

The second disk portion 21 has an annular shape surrounding the shaft 101. The second disk portion 21 is disposed on the other side Da2 of the stator 102 in the axial direction, and extends in a direction intersecting the axial direction Da (for example, in the radial direction Dd).

The second inclined wall portion 22 is annular and extends from the radially outer end of the second disk portion 21 to one axial direction Da1 and radially outer Do.

The flange portion 23 is annular, extends radially outward Do from the radially outer end of the second inclined wall portion 22, and is connected to the other axial end of the cylindrical portion 31. In this embodiment, the flange portion 23 is connected to the other axial end of the cylindrical portion 31 by bolts (not shown). However, the means for connecting the two is not limited to this example.

Note that the second inclined wall portion 22 and the flange portion 23 may be omitted. In this case, the radially outer end of the second disk portion 21 is connected to the other axial end of the cylindrical portion 31 . In other words, the radially outer end of the second disk portion 21 functions as the flange portion 23.

The second bearing holder 24 has a cylindrical shape surrounding the shaft 101, and is arranged at the radially inner end of the second disk portion 21. The second bearing holder 24 holds a second bearing 241 and rotatably supports the shaft 101 via the second bearing 241.

The second end cap 25 is disposed on the inner peripheral surface of the second bearing holder 24 at the other end Da2 in the axial direction than the second bearing 241. The second end cap 25 has an annular shape surrounding the shaft 101 and covers between the shaft 101 and the second bearing holder 24 . The second end cap 25 can prevent dust, liquid, etc. from entering the inside of the motor 100 via the space between the shaft 101 and the second bearing holder 24.

The second cover rib 26 is arranged on the axial end surface of the second cover member 2 and extends in the radial direction Dd. As mentioned above, the rotor 104 has the second cover rib 26. The second cover rib 26 may be singular, or may be arranged in plural numbers in the circumferential direction Dr. In this embodiment, the second cover rib 26 protrudes from one axial end surface of the second disk portion 21 in one axial direction Da1 and extends in the radial direction Dd. A radially outer end portion of the second cover rib 26 is connected to the second inclined wall portion 22 . Note that, without being limited to the example of this embodiment, the second cover rib 26 may be arranged on the other axial end surface of the second cover member 2, or may be arranged on one axial end surface and the other axial end surface of the second cover member 2. It may be arranged on both end faces. The second cover rib 26 can reinforce the second cover member 2. Note that the second cover rib 26 may be omitted without being limited to the example of this embodiment.

<1-4-4. Rib member 4>
Next, the rib member 4 will be explained with reference to FIGS. 1 and 3A to 3B. FIG. 3A is a side view showing a configuration example of the motor 100 on one Da1 side in the axial direction. FIG. 3B is a side view showing a configuration example of the motor 100 on the other Da2 side in the axial direction.

The rib member 4 extends in the radial direction Dd. As described above, the rotor 104 includes the rib member 4. The rib member 4 supports the peripheral plate portion 33 of the rim 3. The rib member 4 includes a plurality of first rib members 41 and a plurality of second rib members 42. A plurality of first rib members 41 and a plurality of second rib members 42 are each arranged in the circumferential direction Dr.

The first rib member 41 connects the cylinder portion 31 and the first circumferential plate portion 331 and supports the first circumferential plate portion 331. However, the present invention is not limited to this example, and the first rib member 41 may connect the cylindrical portion 31 and the radially outer end portion (for example, the first slanted wall portion 12) of the first cover member 1. The second rib member 42 connects the cylindrical portion 31 and the second circumferential plate portion 332 and supports the second circumferential plate portion 332.

Note that in this embodiment, the rib member 4 includes both the first rib member 41 and the second rib member 42. However, this example does not exclude a configuration in which the rib member 4 includes only either the first rib member 41 or the second rib member 42.

That is, the rib member 4 only needs to include at least one of the plurality of first rib members 41 and the plurality of second rib members 42. The first rib member 41 connects one axial side of the cylinder portion 31 and the circumferential plate portion 33 (that is, the first circumferential plate portion 331) on the one Da1 side in the axial direction. The second rib member 42 connects the other axial side of the cylinder portion 31 and the circumferential plate portion 33 (that is, the second circumferential plate portion 332) on the other axial side Da2.

For example, when the tire 2021 is mounted on the rim 3, a strong force directed radially inward Di acts on the peripheral plate portion 33 from the bead of the tire 2021. Therefore, in the motor 100, the peripheral plate portion 33 can be reinforced by arranging at least one of the rib members 4 described above. Specifically, in the motor 100, the first circumferential plate portion 331 is reinforced by the arrangement of the first rib member 41, and deformation of the first circumferential plate portion 331 in the radial direction inward Di can be suppressed or prevented. Further, in the motor 100, the second circumferential plate portion 332 is reinforced by the arrangement of the second rib member 42, and deformation of the second circumferential plate portion 332 in the radial direction inward Di can be suppressed or prevented. Therefore, the motor 100 can improve the rigidity of the rim 3 (particularly the circumferential plate portion 33).

The circumferential width of the rib member 4 is preferably 2 mm or more, more preferably 5 mm or more. In this way, sufficient strength can be imparted to the rib member 4. Furthermore, when the rib member 4 is cast, its castability can be ensured. Note that if the circumferential width of the rib member 4 is less than 2 mm, there is a risk that the rib member 4 may be deformed due to insufficient strength. Furthermore, there is a possibility that the shape of the rib member 4 cannot be maintained when the rim 3 is cast.

Preferably, in at least a portion of the rib member 4, the circumferential width of the radially central portion of the rib member 4 increases toward the radially inward Di. For example, in the present embodiment, the circumferential width Wr1 of the radially central portion of the first rib member 41 increases toward the radially inward Di (see FIG. 3A). Further, the circumferential width Wr2 of the radially central portion of the second rib member 42 increases toward the radially inward Di (see FIG. 3B). By adopting the so-called tapered shape as described above in the radial center portion of the rib member 4, the force acting on the rib member 4 can be dispersed, and the strength of the rib member 4 can be improved. However, this example does not exclude a configuration in which, in all the rib members 4, the circumferential width of the radially central portion of the rib member 4 does not increase as it goes radially inward Di. Further, the circumferential width of the radially central portion of at least one rib member 4 may be the same across the radial direction Dd, or may become smaller toward the radially inward Di.

Preferably, in at least a portion of the rib member 4, the axial width of the rib member 4 increases as it goes radially inward Di. For example, in this embodiment, the axial width Wa1 of the first rib member 41 and the axial width Wa2 of the second rib member 42 increase toward the radial inward Di (see FIG. 1). By adopting the so-called tapered shape as described above for the axial widths Wa1 and Wa2 of the rib member 4, the force acting on the rib member 4 can be dispersed, and the strength of the rib member 4 can be improved. However, this example does not exclude a configuration in which the axial width of the rib member 4 does not increase as it goes radially inward Di in all the rib members 4. Further, the axial width of at least one rib member 4 may be the same across the radial direction Dd, or may become smaller toward the radial inward Di.

Preferably, at least one rib member 4 of the first rib member 41 and the second rib member 42 is arranged at equal intervals in the circumferential direction Dr. For example, in this embodiment, as shown in FIGS. 3A and 3B, the first rib member 41 and the second rib member 42 are each arranged at equal intervals in the circumferential direction Dr. In this way, at least one of the pair of circumferential plate portions 33 can be reinforced more evenly across the circumferential direction Dr. However, this example does not exclude a configuration in which at least some of the first rib member 41 and the second rib member 42 are not arranged at equal intervals in the circumferential direction Dr.

As described above, the rib member 4 is connected to the peripheral plate portion 33. For example, the radially outer end portion of the first rib member 41 is connected to the first circumferential plate portion 331 (see connection portion C1 in FIGS. 2 and 3A). Further, the radially outer end portion of the second rib member 42 is connected to the second circumferential plate portion 332 (see connection portion C2 in FIGS. 2 and 3B). Note that the connecting portions C1 and C2 are an example of the “first connecting portion” of the present invention.

Here, the thickness of the circumferential plate portion 33 at the connection portions C1 and C2 with at least one of the first rib member 41 and the second rib member 42 is the thickness of the peripheral plate portion 33 in the circumferential direction Dr. The thickness may be greater than the thickness of the circumferential plate portion 33 at the portions separated from each other.

FIG. 4 is an enlarged view showing a configuration example near the connection portion C1 between the first rib member 41 and the first circumferential plate portion 331. For example, as shown in FIG. 4, the thickness Wb1 of the first circumferential plate portion 331 at the connecting portion C1 is greater than the thickness Wb2 of the first circumferential plate portion 331 at a portion away from the connecting portion C1 in the circumferential direction Dr. It can be thick. Note that the portion away from the connection portion C1 in the circumferential direction Dr is, for example, a circumferential center portion between the connection portions C1 adjacent to each other in the circumferential direction Dr of the first circumferential plate portion 331.

Similarly, the thickness of the second circumferential plate portion 332 at the connecting portion C2 may be thicker than the thickness of the second circumferential plate portion 332 at a portion away from the connecting portion C2 in the circumferential direction Dr. Note that the portion away from the connection portion C2 in the circumferential direction Dr is, for example, a circumferential center portion between the connection portions C2 adjacent to each other in the circumferential direction Dr of the second circumferential plate portion 332.

When a force directed inward in the radial direction Di is applied to the circumferential plate portion 33, the stress in the circumferential plate portion 33 is greater in the connecting portions C1, C2 than in the portions distant from the connecting portions C1, C2 in the circumferential direction Dr. becomes larger. Therefore, by partially increasing the thickness Wb of the circumferential plate part 33 at the connecting portions C1 and C2, the rigidity of the circumferential plate part 33 can be further improved.

However, the present invention is not limited to the example shown in FIG. 4, and the thickness Wb of at least one of the pair of circumferential plate portions 33 may be the same across the circumferential direction Dr.

Preferably, at least one of the first rib member 41 and the second rib member 42, the rib member 4, is further connected to the side wall portion 32. FIG. 5A is an enlarged view showing a configuration example of the first side wall portion 321 at the connection portion C1 with the first rib member 41. FIG. FIG. 5B is an enlarged view showing a configuration example of the first side wall portion 321 at a portion away from the connection portion C1 with the first rib member 41 in the circumferential direction Dr. Note that FIG. 5A shows a cross-sectional structure of the rim 3 cut along an imaginary plane that includes the dashed line VA in FIG. 4 and is perpendicular to the circumferential direction Dr, and corresponds to the portion V surrounded by the broken line in FIG. 1. FIG. 5B shows a cross-sectional structure of the rim 3 cut along a virtual plane that includes the two-dot chain line VB in FIG. 4 and is perpendicular to the circumferential direction Dr, and corresponds to the portion V surrounded by the broken line in FIG. 1.

In this embodiment, as shown in FIG. 5A, the first rib member 41 is further connected to the end surface of the first side wall portion 321 on the Da1 side in the axial direction (see connection portion C3 in FIGS. 1 and 5A). Further, the second rib member 42 is further connected to the end surface of the second side wall portion 322 on the other Da2 side in the axial direction (see connection portion C4 in FIG. 1). Note that the connecting portions C3 and C4 are an example of the “second connecting portion” of the present invention.

For example, when the tire 2021 is mounted on the rim 3, a strong force directed inward in the radial direction Di acts not only on the circumferential plate portion 33 but also on the side wall portion 32. Therefore, by connecting the rib member 4 to the side wall portion 32, deformation of the side wall portion 32 can be suppressed or prevented. For example, by connecting the first rib member 41 to the first side wall portion 321, deformation of the first side wall portion 321 can be suppressed or prevented. Furthermore, by connecting the second rib member 42 to the second side wall portion 322, deformation of the second side wall portion 322 can be suppressed or prevented.

At this time, the thickness of the side wall portion 32 at the connecting portions C3 and C4 with the rib member 4 of at least one of the first rib member 41 and the second rib member 42 is such that the side wall portion 32 is spaced apart from the connecting portions C3 and C4 in the circumferential direction Dr. The thickness of the side wall portion 32 may be greater than the thickness of the side wall portion 32 at that portion.

For example, as shown in FIGS. 5A and 5B, the thickness Ws1 of the first side wall portion 321 at the connection portion C3 is greater than the thickness Ws2 of the first side wall portion 321 at a portion away from the connection portion C3 in the circumferential direction Dr. It can also be thick. Note that the portion away from the connection portion C3 in the circumferential direction Dr is, for example, a circumferential center portion between the connection portions C3 adjacent to each other in the circumferential direction Dr of the first side wall portion 321.

Similarly, the thickness of the second side wall portion 322 at the connection portion C4 may be thicker than the thickness of the second side wall portion 322 at a portion away from the connection portion C4 in the circumferential direction Dr. Note that the portion away from the connection portion C4 in the circumferential direction Dr is, for example, a circumferential center portion between the connection portions C4 adjacent to each other in the circumferential direction Dr of the second side wall portion 322.

However, the present invention is not limited to the examples shown in FIGS. 5A and 5B, and the thickness Ws of at least one of the pair of side wall portions 32 may be the same across the circumferential direction Dr.

When a force directed inward in the radial direction Di is applied to the side wall portion 32, the stress in the side wall portion 32 is larger at the connecting portions C3 and C4 than at portions distant from the connecting portions C3 and C4 in the circumferential direction Dr. . Therefore, by increasing the thickness of the side wall portion 32 at the connection portions C3 and C4, deformation of the side wall portion 32 can be suppressed or prevented more effectively.

Next, the relative positional relationship of the first rib member 41 and the second rib member 42 in the circumferential direction Dr will be described with reference to FIGS. 6A and 6B. FIG. 6A is a side view showing an example of the arrangement of the first rib member 41 and the second rib member 42 in the circumferential direction Dr. FIG. 6B is a side view showing another arrangement example of the first rib member 41 and the second rib member 42 in the circumferential direction Dr. 6A and 6B are side views of the motor 100 on one Da1 side in the axial direction.

As described above, the rib member 4 includes the first rib member 41 and the second rib member 42. In FIG. 6A, the first rib member 41 is arranged at a different circumferential position than the second rib member 42. In FIG. In this way, compared to a configuration in which the first rib member 41 and the second rib member 42 have the same circumferential position, the first rib member 41 and the second rib member 42 necessary for ensuring the rigidity of the rim 3 (particularly the circumferential plate portion 33) 41 and the number of second rib members 42 can be reduced. Therefore, the number of components of the rim 3 can be reduced, making the rim 3 easier to manufacture. Furthermore, by reducing the number of rib members 4, the weight of the rim 3 can be reduced. Therefore, it is possible to contribute to reducing the weight of the motor 100.

At this time, preferably, as shown in FIG. 6A, the first rib members 41 and the second rib members 42 are arranged alternately in the circumferential direction Dr when viewed from the axial direction Da. In this way, the portion of the rim 3 on one axial direction Da1 side and the other axial direction portion on the Da2 side can be reinforced evenly with a smaller number of reinforcements. However, the illustration in FIG. 6A does not exclude a configuration in which the first rib members 41 and the second rib members 42 are not arranged alternately in the circumferential direction Dr. For example, when viewed from the axial direction Da, a plurality of second rib members 42 may be arranged between the first rib members 41 adjacent in the circumferential direction Dr. Further, when viewed from the axial direction Da, a plurality of first rib members 41 may be arranged between the second rib members 42 adjacent in the circumferential direction Dr.

Preferably, as shown in FIG. 6A, when viewed from the axial direction Da, the intervals between the first rib member 41 and the second rib member 42 that are adjacent to each other in the circumferential direction Dr are equal. In other words, when viewed from the axial direction Da, the first rib members 41 and the second rib members 42 are arranged alternately and at equal intervals in the circumferential direction Dr. In this way, the rim 3 can be reinforced more evenly across the circumferential direction Dr. However, this example does not exclude a configuration in which the distances between the first rib member 41 and the second rib member 42 adjacent to each other in the circumferential direction Dr are different.

On the other hand, in FIG. 6B, the first rib member 41 is arranged at the same circumferential position as the second rib member 42. In this way, the rigidity of the rim 3 can be greatly improved.

Next, preferably, the rib member 4 is arranged at the same circumferential position as the cover ribs 15 and 26. For example, in FIG. 6A, the rib member 4 includes a first rib member 41. In FIG. Preferably, the first cover rib 15 is arranged at the same circumferential position as the first rib member 41. In this way, the rim 3 on the Da1 side in the axial direction and the portion of the rotor 104 including the first cover member 1 on the Da1 side in the axial direction can be reinforced synergistically.

Next, in FIG. 6B, the rib member 4 includes a second rib member 42. Preferably, the second cover rib 26 is arranged at the same circumferential position as the second rib member 42. In this way, the other axial Da2 side of the rim 3 and the portion of the rotor 104 including the second cover member 2 on the other axial Da2 side can be reinforced synergistically.

However, the above example does not exclude a configuration in which the rib member 4 is arranged at a position in the circumferential direction different from that of the cover ribs 15 and 26. For example, at least one first cover rib 15 may be arranged at a different circumferential position than the first rib member 41. Further, at least one second cover rib 26 may be arranged at a different circumferential position from the second rib member 42.

<1-4-5. York 5>
The yoke 5 is arranged on the radially inner surface of the cylindrical portion 31 and surrounds the stator 102. The yoke 5 holds a magnet 6 on its radially inner surface. As described above, the rotor 104 has the yoke 5. The yoke 5 is formed using a magnetic material and is fixed to the radially inner end of the cylindrical portion 31 .

FIG. 7 is a perspective view showing an example of the configuration of the yoke 5. In this embodiment, as shown in FIG. 7, the yoke 5 has a cylindrical shape extending in the axial direction Da. However, the present invention is not limited to the example shown in FIG. 7, and the yoke 5 does not have to be cylindrical. For example, the yoke 5 may have a configuration in which a plurality of arc-shaped yoke pieces extending in the circumferential direction Dr are lined up in the circumferential direction Dr when viewed from the axial direction Da. The yoke 5 has at least one of a first yoke recess 51 , a first yoke protrusion 52 , a second yoke recess 53 , and a second yoke protrusion 54 . These will be explained later.

<1-4-6. Magnet 6>
The magnet 6 is arranged on the radially inner surface of the yoke 5. In the magnet 6, mutually different magnetic poles (N pole and S pole) are arranged alternately in the circumferential direction Dr. As mentioned above, the rotor 104 has the magnet 6. The magnet 6 surrounds a central axis CA extending in the axial direction Da. The magnet 6 may be an annular member surrounding the central axis CA, or may include a plurality of magnet pieces arranged in the circumferential direction Dr.

<1-4-7. Layout structure F>
Next, the arrangement structure F will be explained with reference to FIGS. 7 to 8D. FIG. 8A is a cross-sectional view showing a configuration example of the first radial arrangement structure Fd1. FIG. 8B is a cross-sectional view showing a configuration example of the second radial arrangement structure Fd2. FIG. 8C is a cross-sectional view showing a configuration example of the first axial arrangement structure Fa1. FIG. 8D is a cross-sectional view showing a configuration example of the second axial arrangement structure Fa2. 8A to 8D correspond to the cross-sectional structure of portion VIII surrounded by the broken line in FIG. 1. FIG.

The arrangement structure F is a fitting structure in which a protrusion fits into a recess at the opposing portion of the cylindrical portion 31 and the yoke 5, and is arranged at the opposing portion of the cylindrical portion 31 and the yoke 5. The arrangement structure F includes a first radial arrangement structure Fd1, a second radial arrangement structure Fd2, a first axial arrangement structure Fa1, and a second axial arrangement structure Fa2.

The first radial arrangement structure Fd1 and the second radial arrangement structure Fd2 are arranged at a fixed portion of the yoke 5 in the radial direction Dd with respect to the cylinder portion 31. Below, the first radial arrangement structure Fd1 and the second radial arrangement structure Fd2 may be collectively referred to as "radial arrangement structure Fd."

As shown in FIG. 8A, the first radial arrangement structure Fd1 is composed of a first yoke recess 51 and a first cylindrical protrusion 313. The first yoke recess 51 is arranged at the radially outer end of the yoke 5 and is recessed radially inward Di. The first cylindrical protrusion 313 protrudes radially inward Di from the radially inner end of the cylindrical portion 31 and is disposed within the first yoke recess 51 . Specifically, the first cylinder-side protrusion 313 is arranged on the bottom surface of the groove 310 facing radially inward Di. The first radial arrangement structure Fd1 is a fitting structure in which the first cylindrical protrusion 313 fits into the first yoke recess 51.

As shown in FIG. 8B, the second radial arrangement structure Fd2 includes a first cylinder-side recess 314 and a first yoke protrusion 52. The first cylinder-side recess 314 is arranged at the radially inner end of the cylinder 31 and is recessed radially outward Do. The first yoke protrusion 52 protrudes radially outward Do from the radially outer surface of the yoke 5 and is disposed within the first cylinder-side recess 314 . Specifically, the first cylinder-side recess 314 is arranged on the bottom surface of the groove 310 facing radially inward Di. The second radial arrangement structure Fd2 is a fitting structure in which the first yoke protrusion 52 fits into the first cylinder-side recess 314.

Further, the first axial arrangement structure Fa1 and the second axial arrangement structure Fa2 are arranged at a fixed portion of the yoke 5 in the axial direction Da with respect to the cylinder portion 31. Below, the first axially arranged structure Fa1 and the second axially arranged structure Fa2 may be collectively referred to as "axially arranged structure Fa."

In this embodiment, the first axially arranged structure Fa1 and the second axially arranged structure Fa2 are arranged at both the fixed part on the one axial side Da1 and the fixed part on the other axial side Da2. However, the present invention is not limited to this example, and at least one of the first axially arranged structure Fa1 and the second axially arranged structure Fa2 has only one of a fixed part on one side in the axial direction Da1 and a fixed part on the other side in the axial direction Da2. may be placed in

As shown in FIG. 8C, the first axial arrangement structure Fa1 is composed of the second yoke recess 53 and the second cylinder side protrusion 315. The second yoke recess 53 is disposed at the axial end of the yoke 5 and is recessed in the axial direction Da. The second cylindrical protrusion 315 protrudes in the axial direction Da from a portion of the cylindrical portion 31 that faces the yoke 5 in the axial direction Da, and is disposed within the second yoke recess 53 . Specifically, the second yoke recess 53 is disposed on at least one of the one axial side surface and the other axial side surface of the yoke 5. The second cylinder side protrusion 315 is disposed on at least one of the inner surface of the groove portion 310 facing one axial direction Da1 and the inner surface facing the other axial direction Da2. In other words, the inner surface of the groove 310 in which the second cylindrical protrusion 315 is arranged faces the axial end surface of the yoke 5 in which the second yoke recess 53 is arranged in the axial direction Da. The first axial arrangement structure Fa1 is a fitting structure in which the second cylinder side protrusion 315 fits into the second yoke recess 53.

As shown in FIG. 8D, the second axial arrangement structure Fa2 includes a second cylinder-side recess 316 and a second yoke protrusion 54. The second cylindrical recess 316 is arranged in a portion of the cylindrical portion 31 that faces the yoke 5 in the axial direction Da, and is recessed in the axial direction Da. The second yoke protrusion 54 protrudes from the axial end of the yoke 5 in the axial direction Da, and is disposed within the second cylinder-side recess 316 . Specifically, the second cylinder-side recess 316 is disposed on at least one of the inner surface of the groove 310 facing one axial direction Da1 and the inner surface facing the other axial direction Da2. The second yoke protrusion 54 is arranged on at least one of the axially one side surface and the axially other side surface of the yoke 5 . In other words, the inner surface of the groove 310 in which the second cylinder-side recess 316 is arranged faces the axial end surface of the yoke 5 in which the second yoke protrusion 54 is arranged in the axial direction Da. The second axial arrangement structure Fa2 is a fitting structure in which the second yoke protrusion 54 fits into the second cylinder side recess 316.

Note that, without being limited to the examples of this embodiment, some of the first radial arrangement structure Fd1, the second radial arrangement structure Fd2, the first axial arrangement structure Fa1, and the second axial arrangement structure Fa2 , may be omitted. In other words, if the arrangement structure F includes at least one of the first radial arrangement structure Fd1, the second radial arrangement structure Fd2, the first axial arrangement structure Fa1, and the second axial arrangement structure Fa2. good. As mentioned above, the rotor 104 has an arrangement F.

With this, at least one of the arrangement structures Fd1, Fd2, Fa1, Fa2 in which the protrusions 313, 52, 315, 54 are arranged in the recesses 51, 314, 53, 316 between the yoke 5 and the cylinder part 31, Movement of the yoke 5 in the circumferential direction Dr relative to the cylindrical portion 31 can be prevented. Therefore, the yoke 5 can be stably fixed to the rim 3.

Next, consider a case where the above-described arrangement structure F includes at least one of the first radial arrangement structure Fd1 and the second radial arrangement structure Fd2. Preferably, in this case, at least one of the above-mentioned radial arrangement structures Fd extends at least in the axial direction Da and reaches the axial end of the yoke 5.

For example, at least one of the above-mentioned radial arrangement structures Fd may reach only one axial end and the other axial end of the yoke 5, or the yoke 5 as shown in FIGS. 8A and 8B. may reach both one axial end and the other axial end. For example, at least one of the first yoke recess 51 and the first yoke protrusion 52 may reach only one of the axial one end and the other axial end of the yoke 5, or as shown in FIG. In this way, it may reach both the one axial end and the other axial end of the yoke 5.

This allows at least one of the radial arrangement structures Fd to be made longer between the radially outer end of the yoke 5 and the radially inner end of the cylindrical portion 31, making the yoke 5 more stable with respect to the rim 3. It can be fixed to

However, this example does not exclude a configuration in which at least one of the above-mentioned radial arrangement structures Fd does not reach both the one axial end and the other axial end of the yoke 5. Furthermore, this example does not exclude a configuration in which at least one of the above-mentioned radial arrangement structures Fd does not extend at least in the axial direction Da. For example, the first yoke recess 51 is a groove extending in the axial direction Da in FIG. 7, but is not limited to the example shown in FIG. 7, and may be a hole disposed on the radially outer surface of the yoke 5. Note that this hole may be singular or may be arranged in plurality in the axial direction Da, for example. Further, although the first yoke protrusion 52 is a rib extending in the axial direction Da in FIG. 7, it is not limited to the example shown in FIG. 7, and may be a protrusion disposed on the radially outer surface of the yoke 5. In addition, this protrusion may be singular, and may be arrange|positioned in multiple numbers, for example in the axial direction Da.

Preferably, a plurality of at least one of the above-mentioned radial arrangement structures Fd are arranged in the circumferential direction Dr. In this way, a plurality of fixed portions can be arranged in the circumferential direction Dr between the radially outer end of the yoke 5 and the radially inner end of the cylindrical portion 31. Therefore, the yoke 5 can be more stably fixed to the rim 3. However, this example does not exclude a configuration in which at least one of the first radial arrangement structure Fd1 and the second radial arrangement structure Fd2 is singular.

Furthermore, at least one of the above-mentioned radial arrangement structures Fd may have a more complicated shape. For example, consider a case where at least one of the first yoke recess 51 and the first yoke protrusion 52 is disposed on the yoke 5. In this case, at least one of the above-mentioned shapes may be either the first herringbone shape 55 or the first zigzag shape 56. FIG. 9A is a side view showing an example of the first herringbone shape 55. FIG. 9B is a side view showing an example of the first zigzag shape 56. Note that FIGS. 9A and 9B show the shapes of the first yoke recess 51 and the first yoke protrusion 52 arranged on the radially outer surface of the yoke 5.

As shown in FIG. 9A, the first herringbone shape 55 is composed of a first extending portion 551 and a second extending portion 552. The first extending portions 551 extend toward one side of the circumferential direction Dr toward one axial direction Da1, and are arranged in plurality in the circumferential direction Dr. The second extending portions 552 extend in one direction in the circumferential direction Dr from the other end in the axial direction of each of the first extending portions 551 toward the other axial direction Da2, and are arranged in plurality in the circumferential direction Dr. Note that in FIG. 9A, the first herringbone shape 55 is an example of the "herringbone shape" of the present invention, and the axial direction is an example of the "first direction" of the present invention. Moreover, in FIG. 9A, the first extending part 551 is an example of the "first extending part" of the present invention, and the second extending part 552 is an example of the "second extending part" of the present invention. In addition, the first herringbone shape 55 may further include an extending portion (not shown) extending in the circumferential direction Dr. In addition, in this embodiment, the first extending part 551, the second extending part 552, and the extending part extending in the circumferential direction Dr are all grooves recessed in the radial direction Di, or projecting in the radial direction outward Do. It's a rib. However, the present invention is not limited to this example, and some of the first extending portion 551, the second extending portion 552, and the extending portion extending in the circumferential direction Dr are grooves recessed inward in the radial direction Di, and the remaining portions are grooves recessed inward in the radial direction Di. A portion may be a rib that projects outward Do in the radial direction.

Further, as shown in FIG. 9B, the first zigzag shape 56 is composed of a third extending portion 561 and a fourth extending portion 562. The third extending portions 561 extend toward one side of the circumferential direction Dr toward one axial direction Da1, and are arranged in plurality in the circumferential direction Dr. The fourth extending portions 562 extend in one direction in the circumferential direction Dr from one axial end portion of each third extending portion 561 toward the other axial direction Da2, and are arranged in plurality in the circumferential direction Dr. Note that in FIG. 9B, the first zigzag shape 56 is an example of the "zigzag shape" of the present invention, and the axial direction is an example of the "second direction" of the present invention. Moreover, in FIG. 9B, the third extending part 561 is an example of the "third extending part" of the present invention, and the fourth extending part 562 is an example of the "fourth extending part" of the present invention. Further, in the present embodiment, both the third extending portion 561 and the fourth extending portion 562 are grooves recessed inward in the radial direction Di, or ribs projecting outward in the radial direction Do. However, the present invention is not limited to this example, and some of the third extending part 561 and the fourth extending part 562 are grooves recessed in the radially inward direction Di, and the remaining part projects in the radially outward direction Do. It may be a rib.

By employing the first herringbone shape 55 or the first zigzag shape 56 in at least one of the first yoke recess 51 and the first yoke protrusion 52, the yoke 5 is prevented from rotating relative to the cylindrical portion 31 of the rim 3. can be made stronger.

Furthermore, at least one of the above-mentioned axially arranged structures Fa may have a more complicated shape. For example, consider a case where the above-described arrangement structure F includes at least one of the first axial arrangement structure Fa1 and the second axial arrangement structure Fa2. Preferably, in this case, at least one of the above-mentioned axially arranged structures Fa extends at least in the radial direction Dd and reaches the radial end of the yoke 5.

For example, at least one of the above-mentioned axial arrangement structures Fa may reach only either the radially inner end or the radially outer end of the yoke 5, or the yoke 5 as shown in FIGS. 8C and 8D. may reach both a radially inner end and a radially outer end. For example, at least one of the second yoke recess 53 and the second yoke protrusion 54 may reach only one of the radially inner end and the radially outer end of the yoke 5, or as shown in FIG. In this way, it may reach both the radially inner end and the radially outer end of the yoke 5.

In this way, at least one of the axially disposed structures Fa can be made longer between the axial end of the yoke 5 and the portion of the cylindrical portion 31 that faces the yoke 5 in the axial direction Da. 5 can be fixed more stably.

However, this example does not exclude a configuration in which at least one of the above-mentioned axial arrangement structures Fa does not reach both the radially inner end and the radially outer end of the yoke 5. Moreover, this illustration does not exclude a configuration in which at least one of the above-mentioned axially arranged structures Fa does not extend at least in the radial direction Dd. For example, the second yoke recess 53 is a groove extending at least in the radial direction Dd in FIG. 7, but is not limited to the example shown in FIG. 7, and may be a hole disposed in the axial end surface of the yoke 5. Note that this hole may be singular or may be arranged in plurality in the radial direction Dd, for example. Although the second yoke protrusion 54 is a rib extending at least in the radial direction Dd in FIG. 7, it is not limited to the example shown in FIG. 7, and may be a protrusion disposed on the axial end surface of the yoke 5. Note that this protrusion may be singular, or may be arranged in plural numbers in the radial direction Dd, for example.

Preferably, a plurality of at least one of the above-mentioned axial arrangement structures Fa are arranged in the circumferential direction Dr. In this way, a plurality of fixed portions can be arranged in the circumferential direction Dr between the axial end portion of the yoke 5 and the portion of the cylindrical portion 31 that faces the yoke 5 in the axial direction Da. Therefore, the yoke 5 can be more stably fixed to the rim 3. However, this example does not exclude a configuration in which at least one of the first axially arranged structure Fa1 and the second axially arranged structure Fa2 is singular.

Furthermore, at least one of the above-mentioned axially arranged structures Fa may have a more complicated shape. For example, consider a case where at least one of the second yoke recess 53 and the second yoke protrusion 54 is disposed on the yoke 5. In this case, at least one of the shapes described above may be either the second herringbone shape 57 or the second zigzag shape 58. FIG. 10A is a side view showing an example of the second herringbone shape 57. FIG. 10A is a side view showing an example of the second zigzag shape 58. Note that FIGS. 10A and 10B show the shapes of the second yoke recess 53 and the second yoke protrusion 54 arranged on the radially outer surface of the yoke 5.

As shown in FIG. 10A, the second herringbone shape 57 is composed of a fifth extending portion 571 and a sixth extending portion 572. The fifth extending portions 571 extend in one direction in the circumferential direction Dr toward the radially inward direction Di, and are arranged in plurality in the circumferential direction Dr. The sixth extending portions 572 extend in one direction in the circumferential direction Dr from the radially outer end portion of each of the fifth extending portions 571 toward the radially outer side Do, and are arranged in plurality in the circumferential direction Dr. In addition, in FIG. 10A, the second herringbone shape 57 is another example of the "herringbone shape" of the present invention, and the axial direction is another example of the "first direction" of the present invention. Further, in FIG. 10A, the fifth extending portion 571 is another example of the “first extending portion” of the present invention, and the sixth extending portion 572 is another example of the “second extending portion” of the present invention. In addition, the second herringbone shape 57 may further include an extending portion (not shown) extending in the circumferential direction Dr. In this embodiment, the fifth extending portion 571, the sixth extending portion 572, and the extending portion extending in the circumferential direction Dr are all grooves recessed in the axial direction Da or ribs protruding in the axial direction Da. . However, the present invention is not limited to this example, and part of the fifth extending part 571, the sixth extending part 572, and the extending part extending in the circumferential direction Dr is a groove recessed in the axial direction Da, and the remaining part is a groove part recessed in the axial direction Da. may be a rib protruding in the axial direction Da.

Further, as shown in FIG. 10B, the second zigzag shape 58 is composed of a seventh extending portion 581 and an eighth extending portion 582. The seventh extending portions 581 extend in one direction in the circumferential direction Dr toward the radial inward Di, and are arranged in plurality in the circumferential direction Dr. The eighth extending portions 582 extend in one direction in the circumferential direction Dr from the radially inner end portion of each of the seventh extending portions 581 toward the radially outer side Do, and are arranged in plural in the circumferential direction Dr. In addition, in FIG. 10B, the second zigzag shape 58 is an example of the "zigzag shape" of the present invention, and the axial direction is another example of the "second direction" of the present invention. Further, in FIG. 10B, the seventh extending portion 581 is another example of the “third extending portion” of the present invention, and the eighth extending portion 582 is another example of the “fourth extending portion” of the present invention. In the present embodiment, both the seventh extending portion 581 and the eighth extending portion 582 are grooves recessed in the axial direction Da or ribs protruding in the axial direction Da. However, the present invention is not limited to this example, and a portion of the seventh extending portion 581 and the eighth extending portion 582 may be a groove portion recessed in the axial direction Da, and the remaining portion may be a rib protruding in the axial direction Da. It's okay.

By employing the second herringbone shape 57 or the second zigzag shape 58 in at least one of the second yoke recess 53 and the second yoke protrusion 54, the yoke 5 is prevented from rotating relative to the cylindrical portion 31 of the rim 3. can be made stronger.

Next, preferably, the recesses 51 and 53 of the yoke 5 are located at the same circumferential position as the rib member 4. FIG. 11A is a side view showing an example of the arrangement of the recesses 51 and 53 of the yoke 5 with respect to the first rib member 41. FIG. 11B is a side view showing an example of the arrangement of the recesses 51 and 53 of the yoke 5 with respect to the second rib member 42. In FIG. 11A, the motor 100 is viewed from one axial direction Da1 to the other axial direction Da2. In FIG. 11B, the motor 100 is viewed from the other axial direction Da2 to the one axial direction Da1.

For example, regarding the circumferential position of the first yoke recess 51, consider a case where the aforementioned arrangement structure F includes the first radial arrangement structure Fd1. In this case, the first yoke recess 51 is arranged at the same circumferential position as at least one rib member 4. In this embodiment, as shown in FIGS. 11A and 11B, the first yoke recess 51 is arranged at the same circumferential position as both the first rib member 41 and the second rib member 42. However, the present invention is not limited to this example, and the first yoke recess 51 may be arranged at the same circumferential position as one of the first rib member 41 and the second rib member 42 and at a different circumferential position from the other. Good too.

In this way, the rim 3 can be reinforced with the rib member 4 at the same circumferential position as the first yoke recess 51 of the first radial arrangement structure Fd1. Therefore, the stress concentration near the first yoke recess 51 of the yoke 5 can be reduced, and the rigidity of the yoke 5 can be improved. Furthermore, when the rim 3 is made of a lightweight metal material such as aluminum or its alloy, the rigidity of the rim 3 is greatly influenced by the rigidity of the yoke 5. Therefore, by improving the rigidity of the yoke 5 near the first yoke recess 51, the rigidity of the rim 3 (especially the cylindrical portion 31) can also be improved.

Regarding the circumferential position of the second yoke recess 53, consider the case where the above-mentioned arrangement structure F includes the first axial arrangement structure Fa1. In this case, the second yoke recess 53 is arranged at the same circumferential position as at least one rib member 4. In this embodiment, as shown in FIGS. 11A and 11B, the second yoke recess 53 is arranged at the same circumferential position as both the first rib member 41 and the second rib member 42. However, the present invention is not limited to this example, and the second yoke recess 53 may be arranged at the same circumferential position as one of the first rib member 41 and the second rib member 42 and at a different circumferential position from the other. Good too.

In this way, the rim 3 can be reinforced with the rib member 4 at the same circumferential position as the second yoke recess 53 of the first axially arranged structure Fa1. Therefore, the stress concentration near the second yoke recess 53 of the yoke 5 can be reduced, so that the rigidity of the yoke 5 can be improved. Furthermore, when the rim 3 is made of a lightweight metal material such as aluminum or its alloy, the rigidity of the rim 3 is greatly influenced by the rigidity of the yoke 5. Therefore, by improving the rigidity of the yoke 5 near the second yoke recess 53, the rigidity of the rim 3 (particularly the cylindrical portion 31) can also be improved.

However, the above-mentioned example does not exclude a configuration in which the recesses 51 and 53 of the yoke 5 are located at different positions in the circumferential direction from the rib member 4. For example, at least one of the first yoke recess 51 and the second yoke recess 53 may be arranged at a different circumferential position from both the first rib member 41 and the second rib member 42.

On the other hand, preferably, the protrusions 52 and 54 of the yoke 5 are positioned at different positions in the circumferential direction from the rib member 4. FIG. 12A is a side view showing an example of the arrangement of the protrusions 52 and 54 of the yoke 5 with respect to the first rib member 41. FIG. 12B is a side view showing an example of the arrangement of the protrusions 52 and 54 of the yoke 5 with respect to the second rib member 42. In FIG. 12A, the motor 100 is viewed from one axial direction Da1 to the other axial direction Da2. In FIG. 12B, the motor 100 is viewed from the other axial direction Da2 to the one axial direction Da1.

For example, regarding the circumferential position of the first yoke protrusion 52, consider a case where the aforementioned arrangement structure F includes the second radial arrangement structure Fd2. In this case, the first yoke protrusion 52 is arranged at a different circumferential position from at least one rib member 4. In this embodiment, as shown in FIGS. 12A and 12B, the first yoke protrusion 52 is arranged at a different circumferential position from both the first rib member 41 and the second rib member 42. However, the present invention is not limited to this example, and the first yoke protrusion 52 may be arranged at the same circumferential position as one of the first rib member 41 and the second rib member 42, and at a different circumferential position from the other. It's okay.

In this way, the portion of the rim 3 (particularly the cylindrical portion 31) remote from the rib member 4 in the circumferential direction Dr can be reinforced by the first yoke protrusion 52 of the second radial arrangement structure Fd2. Therefore, the rigidity of the rim 3 can be improved.

Regarding the circumferential position of the second yoke protrusion 54, consider the case where the above-mentioned arrangement structure F includes the second axial arrangement structure Fa2. In this case, the second yoke protrusion 54 is arranged at a different circumferential position from at least one rib member 4. In this embodiment, as shown in FIGS. 12A and 12B, the second yoke protrusion 54 is arranged at a different circumferential position from both the first rib member 41 and the second rib member 42. However, the present invention is not limited to this example, and the second yoke protrusion 54 may be arranged at the same circumferential position as one of the first rib member 41 and the second rib member 42, and at a different circumferential position from the other. It's okay.

In this way, the portion of the rim 3 (particularly the cylindrical portion 31) remote from the rib member 4 in the circumferential direction Dr can be reinforced by the second yoke protrusion 54 of the second axial arrangement structure Fa2. Therefore, the rigidity of the rim 3 can be improved.

However, the above example does not exclude a configuration in which the protrusions 52 and 54 of the yoke 5 are located at the same circumferential position as the rib member 4. For example, at least one of the first yoke protrusion 52 and the second yoke protrusion 54 may be arranged at the same circumferential position as both the first rib member 41 and the second rib member 42.

<1-5. Connection portion between rim 3 and second cover member 2>
Next, first to third configuration examples of the connection portion between the rim 3 and the second cover member 2 will be described.

<1-5-1. First configuration example>
FIG. 13 is a sectional view showing a first configuration example of a connecting portion between the rim 3 and the second cover member 2. As shown in FIG. FIG. 13 is an enlarged view of portion XIII surrounded by the broken line in FIG.

In the first configuration example, as shown in FIG. 13, the rim 3 of the rotor 104 has a first cylinder side peripheral wall portion 711. The first cylinder-side peripheral wall part 711 is an example of the "first peripheral wall part 71" of the present embodiment described later and the "first peripheral wall part" of the present invention, and is an example of the "first peripheral wall part" of the present invention, which will be described later. Spreads to Da2. The first cylinder-side peripheral wall portion 711 is disposed radially outward Do from the radially outer end of the second cover member 2 and contacts the radially outer end of the second cover member 2 in the radial direction Dd.

For example, the first cylinder-side peripheral wall part 711 is arranged at the other axial end of the cylinder part 31, and protrudes from the radial outer end thereof toward the other axial direction Da2. The flange portion 23 contacts the other axial end of the cylinder portion 31 in the axial direction Da, and contacts the first cylinder side peripheral wall portion 711 in the radial direction Dd.

In the first configuration example, the second cover member 2 can be connected to the rim 3 without complicating the configuration of the radially outer end portion of the second cover member 2.

The first cylinder-side peripheral wall portion 711 preferably has a cylindrical shape extending in the axial direction Da. In this way, the second cover member 2 can be connected to the rim 3 more stably. Moreover, since the space between the cylindrical portion 31 and the second cover member 2 can be sealed more reliably, the airtightness within the motor 100 can be improved. However, the first cylinder side peripheral wall portion 711 is not limited to this example, and may have a circular arc shape extending in the circumferential direction Dr, and a plurality of first cylinder side peripheral wall portions 711 may be arranged in the circumferential direction Dr.

In the first configuration example, the flange portion 23 spreads in the radial direction Dd at the radially outer end of the second cover member 2 and contacts the other axial end of the cylinder portion 31 and the first cylinder side peripheral wall portion 711. As described above, the second cover member 2 has the flange portion 23. The contact surface of the flange portion 23 with respect to the other axial end of the cylinder portion 31 is composed of a first contact surface 231 and a second contact surface 232. The first contact surface 231 extends in the axial direction Da and the circumferential direction Dr, and contacts the first cylinder side peripheral wall portion 711 in the radial direction Dd. The second contact surface 232 extends in the radial direction Dd and the circumferential direction Dr, and contacts the cylindrical portion 31 in the axial direction Da. For example, in this embodiment, the first contact surface 231 has a cylindrical shape extending in the axial direction, and the second contact surface 232 has an annular shape surrounding the central axis CA. In this way, due to the contact between the first contact surface 231 and the first cylinder side peripheral wall part 711 and the contact between the second contact surface 232 and the other axial end of the cylinder part 31, the other axial end of the cylinder part 31 The contact area of the second cover member 2 with the portion can be made wider. Therefore, the second cover member 2 can be connected to the rim 3 more stably.

Preferably, the space between the rim 3 and the second cover member 2 is sealed with adhesive G. The adhesive G is interposed between the other axial end of the cylindrical portion 31 and the radial outer end of the second cover member 2 . The rotor 104 has adhesive G.

Specifically, the rim 3 further includes a cylinder-side recess 81. The cylinder-side recess 81 is arranged at the other axial end of the cylinder part 31 at the connection portion between the other axial end of the cylinder part 31 and the radial outer end (for example, the flange part 23) of the second cover member 2. Ru. The cylinder side recess 81 is recessed in one axial direction Da1 and extends in the circumferential direction Dr.

Furthermore, the second cover member 2 further includes a cover-side recess 82. The cover side recess 82 is disposed at the radially outer end of the second cover member 2 (for example, one axial end surface of the flange portion 23) in the above-mentioned connection portion, is recessed in the other axial direction Da2, and is recessed in the circumferential direction Dr. Extends.

At least one of the cylinder-side recess 81 and the cover-side recess 82 has a continuous annular shape extending in the circumferential direction Dr. As shown in FIG. 13, the adhesive G is filled and disposed in the tube-side recess 81 and the cover-side recess 82. As shown in FIG.

Note that the present invention is not limited to the above-mentioned example, and either the cylinder-side recess 81 or the cover-side recess 82 may be omitted. That is, the rotor 104 only needs to have at least one of the cylinder-side recess 81 and the cover-side recess 82 . Note that this "at least one of the recesses 8" is an example of "at least one of the second recesses" of the present invention. Adhesive G is placed in at least one of the cylinder-side recess 81 and the cover-side recess 82 .

In this way, the adhesive G can be sufficiently interposed between the other axial end of the cylindrical portion 31 and the radial outer end of the second cover member 2. Therefore, the adhesive G can sufficiently seal between the two.

Note that the above example does not exclude a configuration in which the member that seals between the rim 3 and the second cover member 2 is sealed with a member other than the adhesive G. For example, instead of the adhesive G, a rubber or metal gasket may be used.

In the first configuration example, preferably, the first cylinder side peripheral wall portion 711 is crimped to the flange portion 23. FIG. 14 is a cross-sectional view showing an example of the configuration of the caulking portion 731 of the first cylinder side peripheral wall portion 711. FIG. 14 shows a cross-sectional structure in which the connection portion between the rim 3 and the second cover member 2 is cut along an imaginary plane that includes the dashed line XIV in FIG. 13 and is perpendicular to the axial direction Da.

As shown in FIG. 14, the second cover member 2 of the rotor 104 further includes a recess 721. The recess 721 is an example of the “first recess 72” of the present embodiment and the “first recess” of the present invention, which will be described later, and is arranged at the radially outer end of the flange portion 23 and extends radially inward Di. Concave. Further, the first cylinder side peripheral wall portion 711 has a caulking portion 731. Specifically, the crimped portion 731 is a portion of the first cylinder side peripheral wall portion 711 that has been deformed by crimping, is crimped into the recess 721, and is disposed within the recess 721.

By crimping a part of the first cylinder-side peripheral wall part 711 into the recess 721, the other axial end of the cylinder part 31 of the rim 3 and the radial outer end of the second cover member 2 can be connected. Furthermore, it is also possible to connect the two using only a caulking structure without using other connection means such as a fastening structure using bolts. That is, in the connection portion of the second cover member 2 to the rim 3, the fastening structure using bolts may be omitted. In this case, the radial width of the other axial end of the cylindrical portion 31 and the radial width of the radial outer end of the second cover member 2 can be made thinner. Therefore, the radial size of the rotor 104 can be made smaller, and the weight of the motor 100 can be further reduced. Alternatively, the radial size of the stator 102 can be made larger or the thickness of the yoke 5 and the magnet 6 of the rotor 104 can be made thicker without changing the radial size of the rotor 104. Therefore, the degree of freedom in designing the magnetic circuit of the motor 100 can be improved.

Note that the above-mentioned examples do not exclude a configuration in which the first cylinder side peripheral wall portion 711 is not crimped to the flange portion 23. For example, the recessed portion 721 and the caulking portion 731 may be omitted.

<1-5-2. Second configuration example>
FIG. 15 is a sectional view showing a second configuration example of a connecting portion between the rim 3 and the second cover member 2. As shown in FIG. FIG. 15 corresponds to portion XIII surrounded by the broken line in FIG.

In the second configuration example, as shown in FIG. 15, the second cover member 2 of the rotor 104 further includes a cover side peripheral wall portion 712. The cover side peripheral wall portion 712 is another example of the “first peripheral wall portion 71” of the present embodiment and the “first peripheral wall portion” of the present invention, and is located from the radially outer end of the second cover member 2 to one side in the axial direction. Spreads to Da1.

For example, the cover-side peripheral wall portion 712 is disposed radially outward Do from the other axial end of the cylindrical portion 31 and is in contact with the other axial end of the cylindrical portion 31 . For example, the cover-side peripheral wall portion 712 is disposed on the flange portion 23 and protrudes from the radially outer end portion of the flange portion 23 in one axial direction Da1. The other axial end of the cylindrical portion 31 contacts the flange portion 23 in the axial direction Da, and contacts the cover side peripheral wall portion 712 in the radial direction Dd.

In the second configuration example, the second cover member 2 can be stably connected to the rim 3 similarly to the first configuration example.

The cover side peripheral wall portion 712 preferably has a cylindrical shape extending in the axial direction Da. In this way, the second cover member 2 can be connected to the rim 3 more stably. Moreover, since the space between the cylindrical portion 31 and the second cover member 2 can be sealed more reliably, the airtightness within the motor 100 can be improved. However, the cover side peripheral wall portion 712 is not limited to this example, and may have a circular arc shape extending in the circumferential direction Dr, and a plurality of cover side peripheral wall portions 712 may be arranged in the circumferential direction Dr.

In the second configuration example, preferably, the space between the rim 3 and the second cover member 2 is sealed with adhesive G. For example, the rotor 104 includes the adhesive G and at least one of the cylinder-side recess 81 and the cover-side recess 82 . Note that these configurations are the same as the first configuration example, so the description thereof will be omitted. Further, the space between the rim 3 and the second cover member 2 may be sealed with a material other than the adhesive G. For example, instead of the adhesive G, a rubber or metal gasket may be used.

In the second configuration example, preferably, the cover-side peripheral wall portion 712 is crimped to the cylindrical portion 31. FIG. 16 is a cross-sectional view showing an example of the structure of the caulking portion 732 of the cover-side peripheral wall portion 712. FIG. 16 shows a cross-sectional structure in which the connection portion between the rim 3 and the second cover member 2 is cut along an imaginary plane that includes the dashed line XVI in FIG. 15 and is perpendicular to the axial direction Da.

As shown in FIG. 16, the rim 3 of the rotor 104 further has a recess 722. The recess 722 is another example of the "first recess 72" of the present embodiment and the "first recess" of the present invention, and is arranged at the radially outer end of the cylindrical portion 31 and extends radially inward Di. Concave. Further, the cover side peripheral wall portion 712 has a caulking portion 732. Specifically, the crimped portion 732 is a portion of the cover side peripheral wall portion 712 that has been deformed by crimping, is crimped into the recess 722, and is disposed within the recess 722.

By crimping a part of the cover-side peripheral wall portion 712 into the recess 722, the other axial end of the cylindrical portion 31 of the rim 3 and the radial outer end of the second cover member 2 can be connected. Furthermore, it is also possible to connect the two using only a caulking structure without using other connection means such as a fastening structure using bolts. That is, in the connection portion of the second cover member 2 to the rim 3, the fastening structure using bolts may be omitted. In this case, the radial width of the other axial end of the cylindrical portion 31 and the radial width of the radial outer end of the second cover member 2 can be made thinner. Therefore, the radial size of the rotor 104 can be made smaller, and the weight of the motor 100 can be further reduced. Alternatively, the radial size of the stator 102 can be made larger or the thickness of the yoke 5 and the magnet 6 of the rotor 104 can be made thicker without changing the radial size of the rotor 104. Therefore, the degree of freedom in designing the magnetic circuit of the motor 100 can be improved.

Note that the above-mentioned examples do not exclude a configuration in which the cover-side peripheral wall portion 712 is not crimped to the cylindrical portion 31. For example, the recessed portion 722 and the caulking portion 732 may be omitted.

<1-5-3. Third configuration example>
FIG. 17 is a sectional view showing a third configuration example of a connecting portion between the rim 3 and the second cover member 2. As shown in FIG. FIG. 17 corresponds to portion XIII surrounded by the broken line in FIG.

In the third configuration example, the second cover member 2 further includes a cover-side peripheral wall portion 712 of the rotor 104. The cover side peripheral wall portion 712 is another example of the “first peripheral wall portion 71” of the present embodiment and the “first peripheral wall portion” of the present invention, and is located from the radially outer end of the second cover member 2 to one side in the axial direction. Spreads to Da1.

Furthermore, the rim 3 further includes a second cylinder side peripheral wall portion 35. The second cylinder side peripheral wall part 35 is an example of the "second peripheral wall part" of the present invention, and extends from the other axial end of the cylinder part 31 in the other axial direction Da2 and extends in the circumferential direction Dr. The second cylinder-side circumferential wall portion 35 is disposed radially inward Di from the cover-side circumferential wall portion 712 and contacts the cover-side circumferential wall portion 712 in the radial direction Dd.

For example, the cover-side peripheral wall portion 712 is disposed on the flange portion 23 and protrudes from the radially outer end of the flange portion 23 in one axial direction Da1. The second cylinder-side peripheral wall part 35 is arranged at the other axial end of the cylinder part 31, and protrudes from the radial inner end thereof toward the other axial direction Da2. The second cylinder side peripheral wall portion 35 contacts the flange portion 23 in the axial direction Da. The cover-side peripheral wall portion 712 contacts the other axial end of the cylinder portion 31 in the axial direction Da, and contacts the second cylinder-side peripheral wall portion 35 in the radial direction Dd.

In the third configuration example, the second cover member 2 can be more stably connected to the rim 3 by contacting the cover side peripheral wall part 712 and the second cylinder side peripheral wall part 35.

The cover side peripheral wall portion 712 preferably has a cylindrical shape extending in the axial direction Da. In this way, the second cover member 2 can be connected to the rim 3 more stably. Moreover, since the space between the cylindrical portion 31 and the second cover member 2 can be sealed more reliably, the airtightness within the motor 100 can be improved. However, the cover side peripheral wall portion 712 is not limited to this example, and may have a circular arc shape extending in the circumferential direction Dr, and a plurality of cover side peripheral wall portions 712 may be arranged in the circumferential direction Dr.

In the third configuration example, preferably, the rim 3 and the second cover member 2 are sealed with adhesive G. For example, the rotor 104 includes the adhesive G and at least one of the cylinder-side recess 81 and the cover-side recess 82 . The cylinder-side recess 81 is arranged at the other axial end of the second cylinder-side peripheral wall 35 . The cylinder side recess 81 is recessed in one axial direction Da1 and extends in the circumferential direction Dr. Note that these configurations are the same as the second configuration example except for the arrangement of the cylinder-side recess 81, and therefore, other explanations will be omitted. Further, the space between the rim 3 and the second cover member 2 may be sealed with a material other than the adhesive G. For example, instead of the adhesive G, a rubber or metal gasket may be used.

In the third configuration example, preferably, the cover side peripheral wall portion 712 is crimped to the second cylinder side peripheral wall portion 35. FIG. 18 is a cross-sectional view showing another example of the structure of the caulking portion 732 of the cover-side peripheral wall portion 712. FIG. 18 shows a cross-sectional structure in which the connection portion between the rim 3 and the second cover member 2 is cut along an imaginary plane that includes the dashed line XVIII in FIG. 17 and is perpendicular to the axial direction Da.

As shown in FIG. 18, the rim 3 of the rotor 104 further has a recess 723. The recess 723 is another example of the "first recess 72" of the present embodiment and the "first recess" of the present invention, and is arranged at the radially outer end of the cylindrical portion 31 and extends radially inward Di. Concave. Further, the cover side peripheral wall portion 712 has a caulking portion 732. Specifically, the crimped portion 732 is a portion of the cover-side peripheral wall portion 712 that has been deformed by crimping, is crimped into the recess 723, and is disposed within the recess 723.

By crimping a portion of the cover-side peripheral wall portion 712 into the recess 723, the other axial end of the cylindrical portion 31 of the rim 3 and the radial outer end of the second cover member 2 can be connected. Furthermore, it is also possible to connect the two using only a caulking structure without using other connection means such as a fastening structure using bolts. That is, in the connection portion of the second cover member 2 to the rim 3, the fastening structure using bolts may be omitted. In this case, the radial width of the other axial end of the cylindrical portion 31 and the radial width of the radial outer end of the second cover member 2 can be made thinner. Therefore, the radial size of the rotor 104 can be made smaller, and the weight of the motor 100 can be further reduced. Alternatively, the radial size of the stator 102 can be made larger or the thickness of the yoke 5 and the magnet 6 of the rotor 104 can be made thicker without changing the radial size of the rotor 104. Therefore, the degree of freedom in designing the magnetic circuit of the motor 100 can be improved.

Note that the above-mentioned examples do not exclude a configuration in which the cover-side peripheral wall portion 712 is not crimped to the second cylinder-side peripheral wall portion 35. For example, the recessed portion 723 and the caulking portion 732 may be omitted.

<1-5-4. Summary of configuration examples>
As explained in the first to third configuration examples above, in this embodiment, the rotor 104 further includes the first peripheral wall portion 71. It expands in the axial direction Da from one of the other axial end of the cylindrical portion 31 and the radial outer end of the second cover member 2 toward the other, and extends in the circumferential direction Dr. Further, the first circumferential wall portion 71 is disposed radially outward Do from the other portion and contacts the other portion in the radial direction Dd. As described above, the first peripheral wall portion 71 is a general term for the first cylinder side peripheral wall portion 711 of the first configuration example and the cover side peripheral wall portion 712 of the second configuration example and the third configuration example. In this way, the mounting position of the second cover member 2 with respect to the rim 3 can be prevented from shifting. Therefore, the second cover member 2 can be stably connected to the rim 3.

Also, preferably, the first peripheral wall portion 71 has a cylindrical shape extending in the axial direction Da. The second cover member 2 can be more stably connected to the rim 3 by the cylindrical first circumferential wall portion 71 being in contact with the other portion described above in the radial direction Dd. Further, the space between the cylindrical portion 31 of the rim 3 and the second cover member 2 can be sealed more reliably. Therefore, the airtightness within the motor 100 can be improved. However, this example does not exclude a configuration in which the first peripheral wall portion 71 is not cylindrical.

Also, preferably, a portion of the first peripheral wall portion 71 is crimped. Specifically, the rotor 104 further includes a first recess 72. The first recess 72 is disposed at the other of the other axial end of the cylindrical portion 31 and the radial outer end of the second cover member 2 and is recessed radially inward Di. As described above, the first recess 72 is a general term for the recess 721 of the first configuration example, the recess 722 of the second configuration example, and the recess 723 of the third configuration example. Further, the first peripheral wall portion 71 that spreads from the above-mentioned one portion has a caulking portion 73 disposed within the first recess 72 . As described above, the crimping part 73 is a general term for the crimping part 731 of the first configuration example, the second configuration example, and the crimping part 732 of the second configuration example. The caulking portion 73 is a part of the first peripheral wall portion 71 .

By crimping a portion of the first peripheral wall portion 71 into the first recess 72, the other axial end of the cylindrical portion 31 of the rim 3 and the radial outer end of the second cover member 2 can be connected. Further, it is also possible to connect the two only by a crimping structure without using other connection means such as a fastening structure using bolts. In this case, the radial width of the other axial end of the cylindrical portion 31 and the radial width of the radial outer end of the second cover member 2 can be made thinner. Therefore, the radial size of the rotor 104 can be made smaller, and the weight of the motor 100 can be further reduced. Alternatively, the radial size of the stator 102 can be made larger or the thickness of the yoke 5 and the magnet 6 of the rotor 104 can be made thicker without changing the radial size of the rotor 104. Therefore, the degree of freedom in designing the magnetic circuit of the motor 100 can be improved.

<1-6. Modification of embodiment>
Next, first to third modifications of the embodiment will be described with reference to FIGS. 19A to 19C. FIG. 19A is a sectional view showing a first modification of the connection portion between the rim 3 and the second cover member 2. FIG. FIG. 19B is a sectional view showing a second modification of the connecting portion between the rim 3 and the second cover member 2. FIG. FIG. 19C is a sectional view showing a third modification of the connecting portion between the rim 3 and the second cover member 2. FIG. Note that FIGS. 19A to 19C correspond to the portion XIII surrounded by the broken line in FIG. 1.

Hereinafter, configurations of these modified examples that are different from the above embodiment will be explained. Further, components similar to those in the above-described embodiments are given the same reference numerals, and their explanations may be omitted. Note that the following first to third modified examples can be arbitrarily combined with the above-described embodiment within a range where no contradiction occurs.

<1-6-1. First modification>
In the first modification, as shown in FIG. 19A, the second cover member 2 of the rotor 104 has a hole 911. The hole 911 is an example of a “hole 91” described later and a “hole” of the present invention, and is arranged in the flange portion 23.

In FIG. 19A, the hole 911 is a through hole that penetrates the flange portion 23 in the axial direction Da. However, the hole 911 is not limited to this example, and the hole 911 may not be a through hole, but may be arranged on one axial end surface of the flange portion 23 and recessed in the other axial direction Da2.

Furthermore, in the first modification, the rim 3 of the rotor 104 has a convex portion 921. The convex portion 921 is an example of a “convex portion 92” described later and a “convex portion” of the present invention, and protrudes from the other axial end of the cylindrical portion 31 toward the other axial direction Da2. At least a portion of the protrusion 921 fits into the hole 911 and is disposed within the hole 911 .

In this way, the second cover member 2 connected to the other axial end of the cylindrical portion 31 can be positioned by the arrangement structure (that is, the fitting structure) of the hole 911 and the convex portion 921. Furthermore, rotation of the second cover member 2 in the circumferential direction Dr relative to the other axial end of the cylindrical portion 31 can be prevented.

Note that the hole portion 911 and the convex portion 921 may have an arc shape extending in the circumferential direction Dr when viewed from the axial direction Da. However, this example does not exclude a configuration in which both are not arcuate. Moreover, the hole 911 and the convex part 921 may be singular, or may be arranged in plural numbers in the circumferential direction Dr.

In addition, the other axial end of the convex portion 921 is arranged at the same axial position as the other axial end surface of the flange portion 23 in FIG. 19A; may be placed. This can prevent the other axial end of the convex portion 921 from protruding from the flange portion 23 to the other axial direction Da2. However, this example does not exclude a configuration in which the other axial end of the convex portion 921 is arranged closer to the other axial end Da2 than the other axial end surface of the flange portion 23.

Furthermore, in the first modification, unlike the above-described embodiment, the first peripheral wall portion 71 is not arranged.

<1-6-2. Second modification>
In the second modification, as shown in FIG. 19B, the rim 3 of the rotor 104 has a hole 912. The hole 912 is an example of the "hole 91" described later and the "hole" of the present invention. The hole 912 is arranged at the other axial end of the cylindrical portion 31 and is recessed in one axial direction Da1.

Furthermore, in the first modification, the second cover member 2 of the rotor 104 has a convex portion 922. The convex portion 922 is an example of the “convex portion 92” described later and the “convex portion” of the present invention, and protrudes from the flange portion 23 in one axial direction Da1. The protrusion 922 fits into the hole 912 and is disposed within the hole 912 .

In this way, the second cover member 2 connected to the other axial end of the cylindrical portion 31 can be positioned by the arrangement structure (that is, the fitting structure) of the hole 912 and the convex portion 921. Furthermore, rotation of the second cover member 2 in the circumferential direction Dr relative to the other axial end of the cylindrical portion 31 can be prevented.

Note that the hole portion 912 and the convex portion 922 may have an arc shape extending in the circumferential direction Dr when viewed from the axial direction Da. However, this example does not exclude a configuration in which both are not arcuate. The hole portion 912 and the convex portion 922 may be provided singly or in plural numbers in the circumferential direction Dr. Further, in the second modification, unlike the above-described embodiment, the first peripheral wall portion 71 is not arranged.

<1-6-3. Third modification>
In the third modification, the first peripheral wall portion 71 is arranged in the configuration of the first modification or the second modification described above. For example, in FIG. 19C, the first cylinder side peripheral wall portion 711 (see FIG. 13) is arranged in the above-described first modification (see FIG. 19A).

However, the present invention is not limited to the example shown in FIG. 19C, and the cover side peripheral wall portion 712 (see FIGS. 15 and 17) may be arranged in the above-described first modification (see FIG. 19A). Moreover, in the above-mentioned second modification (see FIG. 19B), the first cylinder side peripheral wall portion 711 (see FIG. 13) or the cover side peripheral wall portion 712 (see FIGS. 15 and 17) may be arranged.

<1-6-4. Summary of modification examples>
In the first to third modifications described above, the rotor 104 further includes a hole 91 and a convex part 92. The hole 91 is a general term for the above-mentioned holes 911 and 912, and is arranged in one of the other axial end of the cylindrical portion 31 and the second cover member 2. The convex portion 92 is a general term for the above-described convex portions 921 and 922, and is arranged on the other axial end of the cylindrical portion 31 and the second cover member 2.

The hole 91 is recessed in the axial direction Da from the above-mentioned one member toward the above-mentioned other member. The convex portion 92 protrudes from the above-mentioned one member toward the above-mentioned other member in the axial direction Da, and is disposed within the hole 91 . In this way, the second cover member 2 connected to the other axial end of the cylindrical portion 31 can be positioned by the arrangement structure (that is, the fitting structure) of the hole portion 91 and the convex portion 92. Furthermore, rotation of the second cover member 2 in the circumferential direction Dr relative to the other axial end of the cylindrical portion 31 can be prevented.

<2. Others＞
The embodiments of the present invention have been described above. Note that the scope of the present invention is not limited to the above-described embodiments. The present invention can be implemented by adding various changes to the above-described embodiments without departing from the spirit of the invention. Moreover, the matters described in the above-described embodiments can be appropriately and arbitrarily combined as long as no contradiction occurs.

<3. Summary＞
Below, the embodiments described so far will be comprehensively described.

<3-1. First summary>
For example, the motor disclosed herein achieves the first objective of increasing rim stiffness by:
a rotor having a magnet surrounding a central axis extending in the axial direction and rotatable about the central axis;
a stator that is disposed radially inward from the magnet and surrounds the central axis;
Equipped with
The rotor is
a rim having a cylindrical portion surrounding the magnet and the stator and extending in the axial direction;
a first cover member that extends in a direction intersecting the axial direction and is disposed at one axial end of the cylindrical portion;
a rib member extending in the radial direction;
It further has
The rim is
a pair of side wall portions that are annular surrounding the central axis, extend at least radially outward from the cylindrical portion, and oppose each other in the axial direction;
a pair of circumferential plate portions each having an annular shape surrounding the central axis and extending away from each other in the axial direction from the radially outer end of each of the side wall portions;
It further has
The rib member is
a plurality of first rib members connecting one axial side of the cylinder portion and the circumferential plate portion on one axial side;
a plurality of second rib members connecting the other axial side of the cylinder portion and the peripheral plate portion on the other axial side;
The structure includes at least one of the rib members (first structure).

The motor with the first configuration is:
The at least one rib member may be arranged at equal intervals in the circumferential direction (second configuration).

Further, the motor of the first or second configuration is
The rotor is
a second cover member that extends in a direction intersecting the axial direction and is connected to the other axial end of the cylindrical portion;
a first circumferential wall portion extending in the circumferential direction and expanding in the axial direction from one portion to the other portion of the other axial end portion of the cylindrical portion and the radially outer end portion of the second cover member;
has
The first circumferential wall portion may be arranged radially outward from the other portion and may be in contact with the other portion in the radial direction (third configuration).

Further, the motor having any one of the first to third configurations described above is:
The rotor is
a yoke disposed on a radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface;
an arrangement structure including at least one of a first radial arrangement structure, a second radial arrangement structure, a first axial arrangement structure, and a second axial arrangement structure;
It further has
The first radial arrangement structure is
a first yoke recess that is disposed at a radially outer end of the yoke and is recessed radially inward;
a first cylindrical protrusion that protrudes radially inward from a radially inner end of the cylindrical portion and is disposed within the first yoke recess;
It consists of
The second radial arrangement structure is
a first cylinder-side recess that is arranged at a radially inner end of the cylinder and is recessed radially outward;
a first yoke protrusion that protrudes radially outward from a radially outer surface of the yoke and is disposed within the first cylinder-side recess;
It consists of
The first axial arrangement structure is
a second yoke recess disposed at an axial end of the yoke and recessed in the axial direction;
a second cylindrical protrusion protruding axially from a portion of the cylindrical portion axially facing the yoke and disposed within the second yoke recess;
It consists of
The second axial arrangement structure is
a second cylinder-side recess that is arranged in a portion of the cylinder part that faces the yoke in the axial direction and is recessed in the axial direction;
a second yoke protrusion that protrudes in the axial direction from the axial end of the yoke and is disposed within the second cylinder side recess;
A configuration (fourth configuration) may be used.

Furthermore, the motor with the fourth configuration is as follows:
The arrangement structure includes at least one of the first radial arrangement structure and the second radial arrangement structure,
The at least one of the radial arrangement structures may be configured to extend at least in the axial direction and reach an axial end of the yoke (fifth configuration).

Further, the motor of the fourth or fifth configuration is
At least one of the first yoke recess, the first yoke protrusion, the second yoke recess, and the second yoke protrusion is arranged in the yoke,
The at least one shape is either a herringbone shape or a zigzag shape,
The herringbone shape is
a plurality of first extending portions arranged in the circumferential direction, extending in one circumferential direction as one goes in a predetermined first direction;
a plurality of second extending portions arranged in the circumferential direction, each extending in one circumferential direction from the other end in the first direction of each of the first extending portions toward the other end in the first direction;
It consists of
The zigzag shape is
a third extending portion extending in one circumferential direction toward one predetermined second direction and arranged in plurality in the circumferential direction;
a plurality of fourth extending parts arranged in the circumferential direction, each extending in one circumferential direction from one end in the second direction of each of the third extending parts toward the other in the second direction;
A configuration (sixth configuration) may be used.

Further, the motor having any of the fourth to sixth configurations is:
The arrangement structure includes at least one of the first axial arrangement structure and the second axial arrangement structure,
The at least one of the axially arranged structures may be configured to extend at least in the radial direction and reach a radial end of the yoke (seventh configuration).

Further, the motor having any one of the fourth to seventh configurations,
The arrangement structure includes at least one of the first radial arrangement structure and the first axial arrangement structure,
In the first radial arrangement structure, the first yoke recess is arranged at the same circumferential position as the at least one rib member,
In the first axial arrangement structure, the second yoke recess may be arranged at the same circumferential position as the at least one rib member (eighth arrangement).

Further, the motor having any of the fourth to eighth configurations is:
The arrangement structure includes at least one of the second radial arrangement structure and the second axial arrangement structure,
In the second radial arrangement structure, the first yoke protrusion is arranged at a different circumferential position from the at least one rib member,
In the second axial arrangement structure, the second yoke protrusion may be arranged at a different circumferential position from the at least one rib member (ninth arrangement).

Further, the motor having any of the above-mentioned first to ninth configurations,
The rim further includes a pair of rim flanges that extend radially outward from one axial end of the peripheral plate portion on one axial side and the other axial end of the peripheral plate portion on the other axial side. have,
The thickness of the side wall portion and the peripheral plate portion may be thicker than the thickness of the rim flange (a tenth configuration).

Further, the motor having any one of the first to tenth configurations,
The thickness of the circumferential plate portion at the first connecting portion with the at least one rib member is thicker than the thickness of the circumferential plate portion at a portion circumferentially away from the first connecting portion (an eleventh configuration). ).

Further, the motor having any of the above-mentioned first to eleventh configurations,
The at least one rib member may further be connected to the side wall portion (twelfth configuration).

Further, the motor having any one of the first to twelfth configurations,
The thickness of the side wall portion at the second connection portion with the at least one rib member is thicker than the thickness of the side wall portion at a portion circumferentially away from the second connection portion (a thirteenth configuration). There may be.

Further, the motor having any of the above-mentioned first to thirteenth configurations,
The rib member includes the first rib member and the second rib member,
The first rib member may be arranged at a different circumferential position from the second rib member (fourteenth arrangement).

Furthermore, the motor having the fourteenth configuration is as follows:
When viewed from the axial direction, the first rib member and the second rib member may be arranged alternately in the circumferential direction (a fifteenth structure).

Further, the motor having the fourteenth or fifteenth configuration is
When viewed from the axial direction, the first rib member and the second rib member adjacent to each other in the circumferential direction may have equal intervals (sixteenth configuration).

Further, the motor having any of the above-mentioned configurations from the first to the sixteenth,
The rib member includes the first rib member and the second rib member,
The first rib member may be arranged at the same circumferential position as the second rib member (seventeenth structure).

Further, the motor having any of the above-mentioned configurations 1 to 17 has the following configurations:
At least a portion of the rib member may have a configuration in which the circumferential width of the radially central portion of the rib member increases as it goes radially inward (an eighteenth configuration).

Further, the motor having any of the above-mentioned configurations 1 to 18 has the following configurations:
At least a portion of the rib member may have a configuration in which the axial width of the rib member increases as it goes radially inward (a nineteenth configuration).

Further, the motor having any one of the first to nineteenth configurations,
The circumferential width of the rib member may be 2 mm or more (twentieth configuration).

Further, the motor having any of the above-mentioned configurations from the first to the twentieth,
The rim and the first cover member may be configured as a single member (a twenty-first configuration).

Further, the motor having any one of the first to twenty-first configurations,
The rib member includes the first rib member,
The rotor further includes a first cover rib disposed on an axial end surface of the first cover member and extending in the radial direction,
The first cover rib may be disposed at the same circumferential position as the first rib member (a twenty-second configuration).

Further, the motor having any of the above-mentioned first to twenty-second configurations,
The rib member includes the second rib member,
The rotor is
a second cover member that extends in a direction intersecting the axial direction and is disposed at the other axial end of the cylindrical portion;
a second cover rib arranged on the axial end surface of the second cover member and extending in the radial direction;
It further has
The second cover rib may be arranged at the same circumferential position as the second rib member (a twenty-third structure).

Further, the motor having any of the above-mentioned first to twenty-third configurations,
The material of the single member may be aluminum or an aluminum alloy (a twenty-fourth configuration).

Further, the motor having any one of the first to twenty-fourth configurations,
The single member may be a cast molded product (a twenty-fifth configuration).

Further, in order to achieve the first objective of improving the rigidity of the rim, the vehicle disclosed herein:
The configuration includes a motor having any one of the first to twenty-fifth configurations (a twenty-sixth configuration).

<3-2. Second summary>
For example, in order to achieve the second purpose of stably fixing the yoke to the rim, the motor disclosed herein:
a rotor having a magnet surrounding a central axis extending in the axial direction and rotatable about the central axis;
a stator that is disposed radially inward from the magnet and surrounds the central axis;
Equipped with
The rotor is
a rim having a cylindrical portion surrounding the magnet and the stator and extending in the axial direction;
a yoke disposed on a radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface;
an arrangement structure including at least one of a first radial arrangement structure, a second radial arrangement structure, a first axial arrangement structure, and a second axial arrangement structure;
It further has
The first radial arrangement structure is
a first yoke recess that is disposed at a radially outer end of the yoke and is recessed radially inward;
a first cylindrical protrusion that protrudes radially inward from a radially inner end of the cylindrical portion and is disposed within the first yoke recess;
It consists of
The second radial arrangement structure is
a first cylinder-side recess that is arranged at a radially inner end of the cylinder and is recessed radially outward;
a first yoke protrusion that protrudes radially outward from a radially outer surface of the yoke and is disposed within the first cylinder-side recess;
It consists of
The first axial arrangement structure is
a second yoke recess disposed at an axial end of the yoke and recessed in the axial direction;
a second cylindrical protrusion protruding axially from a portion of the cylindrical portion axially facing the yoke and disposed within the second yoke recess;
It consists of
The second axial arrangement structure is
a second cylinder-side recess that is arranged in a portion of the cylinder part that faces the yoke in the axial direction and is recessed in the axial direction;
a second yoke protrusion that protrudes in the axial direction from the axial end of the yoke and is disposed within the second cylinder side recess;
(31st configuration).

The motor with the 31st configuration is:
The arrangement structure includes at least one of the first radial arrangement structure and the second radial arrangement structure,
The at least one of the radial arrangement structures may be configured to extend at least in the axial direction and reach an axial end of the yoke (a thirty-second configuration).

Further, the motor having the 32nd configuration is as follows:
A plurality of at least one of the radial arrangement structures may be lined up in the circumferential direction (a thirty-third structure).

Further, the motor having any of the 31st to 33rd configurations,
At least one of the first yoke recess and the first yoke protrusion is arranged in the yoke,
The at least one shape is either a first herringbone shape or a first zigzag shape,
The first herringbone shape is
a plurality of first extending portions arranged in the circumferential direction, extending in one circumferential direction as one goes in the axial direction;
a plurality of second extending portions arranged in the circumferential direction, each extending in one circumferential direction from the other axial end of each of the first extending portions toward the other axial end;
It consists of
The first zigzag shape is
a third extending portion extending in one direction in the circumferential direction toward one side in the axial direction and arranged in plurality in the circumferential direction;
a plurality of fourth extending parts arranged in the circumferential direction, each extending in one circumferential direction from one axial end of each of the third extending parts toward the other axial end;
It may be a configuration (34th configuration) consisting of (34th configuration).

Further, the motor having any one of the 31st to 34th configurations,
The arrangement structure includes at least one of the first axial arrangement structure and the second axial arrangement structure,
The at least one of the axially arranged structures may be configured to extend at least in the radial direction and reach a radial end of the yoke (a thirty-fifth configuration).

Furthermore, the motor having the thirty-fifth configuration is as follows:
The at least one of the axially arranged structures may be arranged in plural in the circumferential direction (a thirty-sixth structure).

Further, the motor having any one of the 31st to 36th configurations,
At least one of the second yoke recess and the second yoke protrusion is arranged in the yoke,
The at least one shape is either a second herringbone shape or a second zigzag shape,
The second herringbone shape is
A plurality of fifth extending portions are arranged in the circumferential direction and extend in one direction in the circumferential direction toward the inner side in the radial direction;
a plurality of sixth extending portions arranged in the circumferential direction, each extending in one direction in the circumferential direction from the radially outer end of each of the fifth extending portions toward the radial outer side;
It consists of
The second zigzag shape is
a plurality of seventh extending portions that extend in one direction in the circumferential direction as they go radially inward and are arranged in plurality in the circumferential direction;
a plurality of eighth extending parts arranged in the circumferential direction, each extending in one direction in the circumferential direction from the radially inner end of each of the seventh extending parts toward the radially outer side;
A configuration (37th configuration) may be used.

Further, the motor having any of the 31st to 37th configurations is:
The rotor is
a first cover member that extends in a direction intersecting the axial direction and is disposed at one axial end of the cylindrical portion;
a second cover member that extends in a direction intersecting the axial direction and is disposed at the other axial end of the cylindrical portion;
a rib member extending in the radial direction;
It further has
The rim is
a pair of side walls that are annular surrounding the central axis, extend radially outward from the cylindrical portion, and oppose each other in the axial direction;
a pair of circumferential plate portions each extending away from each other in the axial direction from the radially outer end of each of the side wall portions;
It further has
The rib member is
a plurality of first rib members connecting one axial side of the cylinder portion and the circumferential plate portion on one axial side;
a plurality of second rib members connecting the other axial side of the cylinder portion and the peripheral plate portion on the other axial side;
The structure may include at least one of the rib members (38th structure).

Furthermore, the motor having the thirty-eighth configuration is as follows:
The rim and the first cover member may be configured as a single member (a thirty-ninth configuration).

Furthermore, the motor having the 39th configuration is as follows:
The material of the single member may be aluminum or an aluminum alloy (40th configuration).

Further, the motor having the 39th or 40th configuration is:
The single member may be a cast molded product (41st configuration).

Further, the motor having any one of the 38th to 41st configurations,
The arrangement structure includes the first radial arrangement structure,
The first yoke recess may be arranged at the same circumferential position as the at least one rib member (42nd structure).

Further, the motor having any one of the 38th to 42nd configurations,
The arrangement structure includes the second radial arrangement structure,
The first yoke protrusion may be arranged at a different circumferential position from the at least one rib member (43rd arrangement).

Further, the motor having any one of the 38th to 43rd configurations,
The arrangement structure includes the first axial arrangement structure,
The second yoke recess may be arranged at the same circumferential position as the at least one rib member (a forty-fourth structure).

Further, the motor having any one of the 38th to 44th configurations,
The arrangement structure includes the second axial arrangement structure,
The second yoke protrusion may be arranged at a different circumferential position from the at least one rib member (45th arrangement).

Furthermore, in order to achieve the second objective of stably fixing the yoke to the rim, the vehicle disclosed herein:
The configuration includes a motor having any one of the 31st to 45th configurations (a 46th configuration).

<3-3. Third summary>
For example, in order to achieve the third objective of improving the productivity of the motor, the motor disclosed herein:
a rotor having a magnet surrounding a central axis extending in the axial direction and rotatable about the central axis;
a stator that is disposed radially inward from the magnet and surrounds the central axis;
Equipped with
The rotor is
a rim having a cylindrical portion surrounding the magnet and the stator and extending in the axial direction;
a first cover member that extends in a direction intersecting the axial direction and is connected to one axial end of the cylindrical portion;
a second cover member that extends in a direction intersecting the axial direction and is connected to the other axial end of the cylindrical portion;
a first circumferential wall portion extending in the circumferential direction and expanding in the axial direction from one portion to the other portion of the other axial end portion of the cylindrical portion and the radially outer end portion of the second cover member;
has
The first peripheral wall portion is disposed radially outward than the other portion and is in contact with the other portion in the radial direction,
The rim is
a pair of side wall portions that are annular surrounding the central axis, extend outward from the cylindrical portion at least in the radial direction, and oppose each other in the axial direction;
a pair of circumferential plate portions each extending away from each other in the axial direction from the radially outer end of each of the side wall portions;
a pair of rim flanges that respectively extend outward in the radial direction from one axial end of the circumferential plate portion on one axial side and the other axial end of the circumferential plate portion on the other axial side;
It further has
The rim and the first cover member are configured as a single member (51st configuration).

The motor with the 51st configuration is:
The first peripheral wall portion may have a cylindrical configuration extending in the axial direction (52nd configuration).

Further, the motor having the 51st or 52nd configuration is:
The first circumferential wall part extends in the other axial direction from the other axial end of the cylindrical part and is disposed radially outward from the radial outer end of the second cover member. It may be a configuration (53rd configuration) that is in contact with the radially outer end of the radially outer end.

Furthermore, the motor having the 53rd configuration is as follows:
The second cover member has a flange portion that extends in the radial direction at a radially outer end portion and contacts the other axial end portion of the cylindrical portion and the first peripheral wall portion,
The contact surface of the flange portion with the other axial end of the cylinder portion is
a first contact surface that extends in the axial direction and the circumferential direction and contacts the first peripheral wall portion in the radial direction;
a second contact surface that extends in the radial direction and the circumferential direction and contacts the cylindrical portion in the axial direction;
It may be a configuration (54th configuration) consisting of (54th configuration).

Further, the motor having the 51st or 52nd configuration is:
The first circumferential wall portion extends in one axial direction from the radially outer end portion of the second cover member,
The rim further includes a second peripheral wall part that extends from the other axial end of the cylinder part to the other axial direction and extends in the circumferential direction,
The second peripheral wall portion may be arranged radially inward from the first peripheral wall portion and may be in contact with the first peripheral wall portion in the radial direction (a fifty-fifth configuration).

Further, the motor having any of the above fifty-first to fifty-fifth configurations,
The rotor further includes a first recess that is disposed at the other of the other axial end of the cylindrical portion and the radial outer end of the second cover member and is recessed inward in the radial direction,
The first peripheral wall part extending from the one part has a caulking part disposed in the first recess,
The caulking portion may be a part of the first peripheral wall portion (56th configuration).

Further, the motor having any one of the 51st to 56th configurations,
The rotor is
an adhesive interposed between the other axial end of the cylindrical portion and the radial outer end of the second cover member;
a second recess of at least one of the cylinder side recess and the cover side recess;
It further has
The cylinder-side recess is disposed at the other axial end of the cylinder and is recessed in one direction in the axial direction at a connection portion between the other axial end of the cylinder and the radially outer end of the second cover member. extending circumferentially with
The cover-side recess is disposed at a radially outer end of the second cover member in the connection portion, is recessed in the other axial direction, and extends in the circumferential direction;
The adhesive may be placed in at least one of the second recesses (57th configuration).

Further, the motor having any one of the 51st to 57th configurations is:
The rotor is
a hole disposed in one of the other axial end of the cylindrical portion and the second cover member;
a convex portion disposed on the other axial end of the cylindrical portion and the second cover member;
It further has
The hole is recessed in the axial direction from the one member to the other member,
The convex portion may be configured to protrude from the one member toward the other member in the axial direction and be disposed within the hole (58th configuration).

Further, the motor having any one of the 51st to 58th configurations is:
The material of the single member may be aluminum or an aluminum alloy (59th configuration).

Further, the motor having any one of the 51st to 59th configurations,
The single member may be a cast molded product (sixtieth configuration).

Further, the motor having any one of the 51st to 60th configurations,
The second cover member may be arranged on the other axial side of the rim flange on the other axial side (sixty-first configuration).

Furthermore, in order to achieve the third objective of improving the productivity of the motor, the vehicle disclosed herein:
The configuration includes a motor having any of the 51st to 61st configurations (62nd configuration).

The invention according to the first object of the present application is useful, for example, for a motor having a rim whose circumferential plate portion is supported by a rib member. The invention according to the second object is useful, for example, for a motor in which a yoke is arranged on the radially inner surface of a cylindrical rim. The invention according to the third object is useful, for example, for a motor in which a disc-shaped cover member is connected to an axial end of a cylindrical rim.

DESCRIPTION OF SYMBOLS 100... Motor, 101... Shaft, 102... Stator, 1021... Stator core, 1022... Insulator, 1023... Coil part, 103... Stator holder, 1031... Inner cylinder Part, 1032... Holder cylinder part, 1033... Connection part, 104... Rotor, 1... First cover member, 11... First disk part, 12... First slanted wall part , 13... First bearing holder, 131... First bearing, 14... First end cap, 15... First cover rib, 2... Second cover member, 21... Second Disc part, 22... Second slanted wall part, 23... Flange part, 231... First connection surface, 232... Second connection surface, 235... Hole, 236... Convex Part, 24... Second bearing holder, 241... Second bearing, 25... Second end cap, 26... Second cover rib, 3... Rim, 31... Cylinder part, 310 ...Groove portion, 313...First cylinder side protrusion, 314...First cylinder side recess, 315...Second cylinder side protrusion, 316...Second cylinder side recess, 32... - Side wall part, 321... First side wall part, 322... Second side wall part, 33... Circumferential plate part, 331... First circumferential plate part, 332... Second circumferential plate part, 34... Rim flange, 341... First rim flange, 3411... Wall, 3412... Flange, 342... Second rim flange, 3421... Wall, 3422... Flange part, 35... Second cylinder side peripheral wall part, 4... Rib member, 41... First rib member, 42... Second rib member, 5... Yoke, 51... No. 1 yoke recess, 52... first yoke protrusion, 53... second yoke recess, 54... second yoke protrusion, 55... first herringbone shape, 551... th 1 extending part, 552... 2nd extending part, 56... 1st zigzag shape, 561... 3rd extending part, 562... 4th extending part, 57... 2nd herring Bone shape, 571... Fifth extending part, 572... Sixth extending part, 58... Second zigzag shape, 581... Seventh extending part, 582... Eighth extending part, 6 . . . Magnet, 71 . . . First peripheral wall portion, 711 . . . First cylinder side peripheral wall portion, 712 . ... Recessed part, 73, 731, 732 ... Caulking part, 8 ... Second recessed part, 81 ... Cylinder side recessed part, 82 ... Cover side recessed part, 91, 911, 912 ... Hole part , 92,921,922...Protrusion, 200...Vehicle, 201...Front wheel, 202...Rear wheel, 2021...Tire, 203...Vehicle body, 204...Handle, 205 ...ECU, 206...Battery, G...Adhesive, CA...Central axis, Da...Axis direction, Da1...One axial direction, Da2...The other axial direction , Dd... radial direction, Di... radially inward, Do... radially outward, Dr... circumferential direction, F... arrangement structure, Fd... radial arrangement structure, Fd1 ...First radial arrangement structure, Fd2... Second radial arrangement structure, Fa... Axial arrangement structure, Fa1... First axial arrangement structure, Fa2... Second axial arrangement structure

Claims (22)

1. a rotor having a magnet surrounding a central axis extending in the axial direction and rotatable about the central axis;
   a stator that is disposed radially inward from the magnet and surrounds the central axis;
   Equipped with
   The rotor is
   a rim having a cylindrical portion surrounding the magnet and the stator and extending in the axial direction;
   a first cover member that extends in a direction intersecting the axial direction and is disposed at one axial end of the cylindrical portion;
   a rib member extending in the radial direction;
   It further has
   The rim is
   a pair of side wall portions that are annular surrounding the central axis, extend at least radially outward from the cylindrical portion, and oppose each other in the axial direction;
   a pair of circumferential plate portions each having an annular shape surrounding the central axis and extending away from each other in the axial direction from the radially outer end of each of the side wall portions;
   It further has
   The rib member is
   a plurality of first rib members connecting one axial side of the cylinder portion and the circumferential plate portion on one axial side;
   a plurality of second rib members connecting the other axial side of the cylinder portion and the peripheral plate portion on the other axial side;
   A motor including at least one rib member of the motor.
2. The rotor is
   a second cover member that extends in a direction intersecting the axial direction and is connected to the other axial end of the cylindrical portion;
   a first circumferential wall portion extending in the circumferential direction and expanding in the axial direction from one portion to the other portion of the other axial end portion of the cylindrical portion and the radially outer end portion of the second cover member;
   has
   The motor according to claim 1, wherein the first peripheral wall portion is disposed radially outward from the other portion and contacts the other portion in the radial direction.
3. The rotor is
   a yoke disposed on a radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface;
   an arrangement structure including at least one of a first radial arrangement structure, a second radial arrangement structure, a first axial arrangement structure, and a second axial arrangement structure;
   It further has
   The first radial arrangement structure is
   a first yoke recess that is disposed at a radially outer end of the yoke and is recessed radially inward;
   a first cylindrical protrusion that protrudes radially inward from a radially inner end of the cylindrical portion and is disposed within the first yoke recess;
   It consists of
   The second radial arrangement structure is
   a first cylinder-side recess that is arranged at a radially inner end of the cylinder and is recessed radially outward;
   a first yoke protrusion that protrudes radially outward from a radially outer surface of the yoke and is disposed within the first cylinder-side recess;
   It consists of
   The first axial arrangement structure is
   a second yoke recess disposed at an axial end of the yoke and recessed in the axial direction;
   a second cylindrical protrusion protruding axially from a portion of the cylindrical portion axially facing the yoke and disposed within the second yoke recess;
   It consists of
   The second axial arrangement structure is
   a second cylinder-side recess that is arranged in a portion of the cylinder part that faces the yoke in the axial direction and is recessed in the axial direction;
   a second yoke protrusion that protrudes in the axial direction from the axial end of the yoke and is disposed within the second cylinder side recess;
   The motor according to claim 1 or 2, comprising:
4. The arrangement structure includes at least one of the first radial arrangement structure and the second radial arrangement structure,
   4. The motor of claim 3, wherein the at least one radial arrangement extends at least axially to an axial end of the yoke.
5. At least one of the first yoke recess, the first yoke protrusion, the second yoke recess, and the second yoke protrusion is arranged in the yoke,
   The at least one shape is either a herringbone shape or a zigzag shape,
   The herringbone shape is
   a plurality of first extending portions arranged in the circumferential direction, extending in one circumferential direction as one goes in a predetermined first direction;
   a plurality of second extending portions arranged in the circumferential direction, each extending in one circumferential direction from the other end in the first direction of each of the first extending portions toward the other end in the first direction;
   It consists of
   The zigzag shape is
   a third extending portion extending in one circumferential direction toward one predetermined second direction and arranged in plurality in the circumferential direction;
   a plurality of fourth extending parts arranged in the circumferential direction, each extending in one circumferential direction from one end in the second direction of each of the third extending parts toward the other in the second direction;
   The motor according to any one of claims 3 and 4, comprising:
6. The arrangement structure includes at least one of the first axial arrangement structure and the second axial arrangement structure,
   6. A motor according to any one of claims 3 to 5, wherein the at least one axially arranged structure extends at least radially to reach a radial end of the yoke.
7. The arrangement structure includes at least one of the first radial arrangement structure and the first axial arrangement structure,
   In the first radial arrangement structure, the first yoke recess is arranged at the same circumferential position as the at least one rib member,
   The motor according to any one of claims 3 to 6, wherein in the first axial arrangement structure, the second yoke recess is arranged at the same circumferential position as the at least one rib member.
8. The arrangement structure includes at least one of the second radial arrangement structure and the second axial arrangement structure,
   In the second radial arrangement structure, the first yoke protrusion is arranged at a different circumferential position from the at least one rib member,
   The motor according to any one of claims 3 to 7, wherein in the second axial arrangement structure, the second yoke protrusion is arranged at a different circumferential position from the at least one rib member. .
9. The rim further includes a pair of rim flanges that extend radially outward from one axial end of the peripheral plate portion on one axial side and the other axial end of the peripheral plate portion on the other axial side. have,
   The motor according to any one of claims 1 to 8, wherein the side wall portion and the peripheral plate portion are thicker than the rim flange.
10. The thickness of the circumferential plate portion at a first connecting portion with the at least one rib member is thicker than the thickness of the circumferential plate portion at a portion circumferentially distant from the first connecting portion. The motor according to any one of item 9.
11. The motor according to any one of claims 1 to 10, wherein the at least one rib member is further connected to the side wall portion.
12. Claims 1 to 11, wherein the thickness of the side wall portion at the second connection portion with the at least one rib member is thicker than the thickness of the side wall portion at a portion circumferentially distant from the second connection portion. The motor according to any one of the above.
13. The rib member includes the first rib member and the second rib member,
    The motor according to any one of claims 1 to 12, wherein the first rib member is arranged at a different circumferential position than the second rib member.
14. The motor according to claim 13, wherein the first rib member and the second rib member are arranged alternately in the circumferential direction when viewed from the axial direction.
15. The motor according to claim 13 or 14, wherein the first rib member and the second rib member adjacent to each other in the circumferential direction have equal intervals when viewed from the axial direction.
16. The rib member includes the first rib member and the second rib member,
    The motor according to any one of claims 1 to 15, wherein the first rib member is arranged at the same circumferential position as the second rib member.
17. The motor according to any one of claims 1 to 16, wherein in at least a portion of the rib member, a circumferential width of a radially central portion of the rib member increases as it goes radially inward.
18. The motor according to any one of claims 1 to 17, wherein the axial width of the rib member increases as it goes radially inward in at least a portion of the rib member.
19. 19. A motor according to claims 1 to 18, wherein the rim and the first cover member are configured as a single piece.
20. The rib member includes the first rib member,
    The rotor further includes a first cover rib disposed on an axial end surface of the first cover member and extending in the radial direction,
    The motor according to any one of claims 1 to 19, wherein the first cover rib is arranged at the same circumferential position as the first rib member.
21. The rib member includes the second rib member,
    The rotor is
    a second cover member that extends in a direction intersecting the axial direction and is disposed at the other axial end of the cylindrical portion;
    a second cover rib arranged on the axial end surface of the second cover member and extending in the radial direction;
    It further has
    The motor according to any one of claims 1 to 20, wherein the second cover rib is arranged at the same circumferential position as the second rib member.
22. A vehicle comprising the motor according to any one of claims 1 to 21.

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