Motor, Vehicle

Abstract

To provide a weight-saved motor.SOLUTION: A motor 100 includes a rotor 104 and a stator 102. A cylinder part 24 of the rotor surrounds the stator and extends in an axial direction. A yoke 3 is disposed on a radial inner surface of the cylinder part, surrounds the stator and holds a magnet 4 in the radial inner surface. Cover members 2 and 5 extend in a radial direction and are disposed at axial ends of the cylinder part. A fixing member 6 fixes the cover members to the cylinder part. The cylinder part includes a projection 25 and a hole 26. The projection projects outward in a radial direction. The fixing member is coupled to the hole. The hole extends in the axial direction from an end of a cover member side in the axial direction of the projection.SELECTED DRAWING: Figure 1

Description

Technical Field

[0006] , , ,

[0001] The present invention relates to a motor and a vehicle.

Background Art

[0002] Conventionally, an in-wheel motor in which a tire is mounted on a cylindrical rim disposed on the outer peripheral portion of a rotor is known. For example, the rotor of the in-wheel motor is disposed outside the stator. A magnetic flux permeable ring is fixed to the inner peripheral surface of the rim of the rotor. Disk-shaped covers are screwed to both side openings of the rim. (See the specification of Chinese Patent Application Publication No. 109995179)

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the specification of Chinese Patent Application Publication No. 109995179, the disk-shaped cover is fixed by screwing a screw to the axial end portion of the magnetic flux permeable ring. In this case, in order to form a screw hole in the magnetic flux permeable ring, it is necessary to make the radial thickness of the magnetic flux permeable ring larger than the outer shape of the screw hole. Therefore, due to the thickening of the magnetic flux permeable ring, the weight of the motor is likely to increase, and it has been difficult to reduce the weight.

[0005] An object of the present invention is to reduce the weight of the motor.

Means for Solving the Problems

[0006] An exemplary motor of the present invention comprises a rotor and a stator. The rotor has magnets surrounding a central axis extending in the axial direction. The rotor is rotatable about the central axis. The stator is positioned radially inward from the magnets. The rotor has a cylindrical portion, a yoke, a cover member, and a fixing member. The cylindrical portion extends axially, surrounding the stator. The yoke is positioned on the radially inner surface of the cylindrical portion, surrounding the stator, and holds the magnets on its radially inner surface. The cover member extends radially and is positioned at the axial end of the cylindrical portion. The fixing member fixes the cover member to the cylindrical portion. The cylindrical portion has a projection and a hole. The projection protrudes radially outward. The fixing member is connected to the hole. The hole extends axially from the axial end of the projection on the cover member side.

[0007] An exemplary vehicle of the present invention is equipped with the above-described motor. [Effects of the Invention]

[0008] According to the exemplary motor and vehicle of the present invention, the motor can be made lighter. [Brief explanation of the drawing]

[0009] [Figure 1] Figure 1 is a cross-sectional view showing an example of a motor configuration. [Figure 2] Figure 2 is a conceptual diagram showing an example of a vehicle configuration equipped with a motor. [Figure 3] Figure 3 is a perspective view showing an example of the arrangement of protrusions and holes. [Figure 4] Figure 4 is an enlarged view of the protruding portion and the hole. [Figure 5] Figure 5 is a cross-sectional view showing a first modified example of the protruding portion and the hole. [Figure 6] Figure 6 is a cross-sectional view showing a second modified example of the protruding portion and the hole. [Figure 7] Figure 7 is a cross-sectional view showing a modified example of the connection of the cover members. [Modes for carrying out the invention]

[0010] An exemplary embodiment will be described below with reference to the drawings.

[0011] In this specification, the direction parallel to the central axis CA in the motor 100 is referred to as the "axial direction Da". Of the axial directions Da, the direction from the second cover member 5 toward the first cover member 2, as described later, is referred to as "one axial direction Da1", and the direction from the first cover member 2 toward the second cover member 5 is referred to as "the other axial direction Da2".

[0012] Furthermore, the direction perpendicular to the central axis CA is called the "radial direction Dd," and the direction of rotation around the central axis CA is called the "circumferential direction Dr." Of the radial directions Dd, the direction approaching the central axis CA is called the "radial inward direction Di," and the direction moving away from the central axis CA is called the "radial outward direction Do."

[0013] Furthermore, in this specification, "ring" includes not only shapes that are continuous and uninterrupted throughout the entire circumferential direction Dr centered on the central axis CA, but also shapes that have one or more breaks in a part of the entire area centered on the central axis CA. It also includes shapes that form a closed curve on a curved surface intersecting the central axis CA.

[0014] Furthermore, "constant" includes not only being strictly fixed at one and unchanging, but also being substantially fixed at one. In other words, "constant" includes being fixed at one with an error that does not deviate from the spirit of the present invention.

[0015] Furthermore, in the positional relationship between any of the directions, lines, and planes and any of the others, "parallel" includes not only a state in which the two do not intersect at all no matter how far they are extended, but also a state in which they are substantially parallel. Similarly, "perpendicular" and "orthogonal" include not only a state in which the two intersect at a 90-degree angle, but also a state in which they are substantially perpendicular and a state in which they are substantially orthogonal, respectively. In other words, "parallel," "perpendicular," and "orthogonal" each include a state in which there is an angular difference in the positional relationship between the two that does not deviate from the spirit of the present invention.

[0016] Note that these are used for illustrative purposes only and are not intended to limit the actual positional relationships, directions, names, states, etc.

[0017] <1. Motor 100> FIG. 1 is a cross-sectional view showing a configuration example of the motor 100. FIG. 2 is a conceptual diagram showing a configuration example of the vehicle 200 equipped with the motor 100. The motor 100 of the present embodiment is a so-called in-wheel motor and is mounted on the vehicle 200.

[0018] The vehicle 200 in FIG. 2 is an electric two-wheeler. The vehicle 200 includes a motor 100. Further, the vehicle 200 further includes a front wheel 201, a rear wheel 202, a vehicle body 203, a handle 204, an ECU (electronic control unit) 205, and a battery 206. The front wheel 201 and the rear wheel 202 are rotatably attached to the vehicle body 203. The motor 100 is disposed on the rear wheel 202. The rear wheel 202 has the motor 100 and a tire 2021. The tire 2021 is a tubeless tire mounted on a rim 1 described later of the motor 100 and configured together with the rim 1. A handle 204 is attached to the front portion of the vehicle body 203. The ECU 205 is disposed inside the vehicle body 203. The ECU 205 is a control device that controls each component of the vehicle 200, for example, controls the motor 100 and the battery 206. The battery 206 is disposed inside the vehicle body 203. The battery 206 is a rechargeable secondary battery and supplies power to, for example, the motor 100 and the ECU 205. In the present embodiment, a lithium-ion battery is adopted for the battery 206.

[0019] In the vehicle 200 of the present embodiment, as will be described later, the motor 100 can be lightweight. Note that the examples of the present embodiment do not exclude a configuration in which the motor 100 is mounted on a vehicle other than an electric two-wheeler.

[0020] As shown in FIG. 1, the motor 100 includes a shaft 101, a stator 102, a stator holder 103, and a rotor 104.

[0021] <1-1. Shaft 101> The shaft 101 is cylindrical in shape and extends axially Da along the central axis CA. In this embodiment, the shaft 101 is a fixed shaft and is fixed non-rotatably to, for example, the body 203 of the vehicle 200.

[0022] <1-2.Status 102> The stator 102 is positioned radially inward Di from the magnet 4 of the rotor 104 (described later) and surrounds the central axis CA. As described above, the motor 100 includes the stator 102. The stator 102 faces the magnet 4 in the radial direction Dd. The stator 102 has a stator core 1021, an insulator 1022, and a plurality of coil sections 1023. The stator core 1021 is formed using a magnetic material and, in this embodiment, is a laminate in which electromagnetic steel sheets are stacked in the axial direction Da. The insulator 1022 is formed of an electrically insulating material such as resin and is positioned at one axial end and the other axial end of the stator core 1021. The coil sections 1023 are positioned on the stator core 1021 via the insulator 1022. When a drive current is supplied to each coil section 1023, the stator 102 is excited and drives the rotor 104 to rotate.

[0023] <1-3. Stator Holder 103> The stator holder 103 holds the stator 102. The stator holder 103 has an inner cylinder portion 1031, a holder cylinder portion 1032, and a connecting portion 1033. The inner cylinder portion 1031 is cylindrical, extending axially Da around the central axis CA, and is fixed to the radially outer surface of the shaft 101. The holder cylinder portion 1032 is positioned radially outward Do than the inner cylinder portion 1031. The holder cylinder portion 1032 extends axially Da around the central axis CA and holds the stator core 1021 on its radially outer surface. The connecting portion 1033 connects the inner cylinder portion 1031 and the holder cylinder portion 1032. The connecting portion 1033 extends radially outward Do from the radially outer surface of the inner cylinder portion 1031. The radially outer portion of the connecting portion 1033 is connected to the holder cylinder portion 1032.

[0024] <1-4. Rotor 104> The rotor 104 is rotatable about a central axis CA extending in the axial direction Da. As described above, the motor 100 includes the rotor 104. In this embodiment, the rotor 104 is rotatable with respect to the shaft 101. The rotor 104 includes a rim 1, a first cover member 2, a yoke 3, a magnet 4, a second cover member 5, and a fixing member 6. In this embodiment, the rim 1, the first cover member 2, and the second cover member 5 are made of a metal material such as iron (or an alloy thereof). However, these materials are not limited to this example and may be lightweight metal materials such as aluminum (or an alloy thereof), stainless steel, etc.

[0025] <1-4-1.Rim 1> The rim 1 is cylindrical, surrounding the central axis CA. A tire 2021 (see Figure 2) is mounted on the rim 1. The rim 1 has a cylindrical rim bottom 11 extending in the axial direction Da.

[0026] <1-4-2. First cover member 2> The first cover member 2 is an annular shape that surrounds the shaft 101 and is formed, for example, by press working of a steel plate. However, this example does not exclude configurations in which the first cover member 2 is formed by other manufacturing methods (such as casting).

[0027] The first cover member 2 includes a first disc portion 21, a first inclined wall portion 22, a first flange portion 23, a cylindrical portion 24, a protruding portion 25, a hole portion 26, a first bearing holder 27, a first bearing 271, and a first end cap 28.

[0028] The first disc portion 21 is an annular shape that surrounds the shaft 101. The first disc portion 21 is positioned one axial direction Da1 relative to the stator 102 and extends in a direction intersecting the axial direction Da (for example, radial direction Dd).

[0029] The first inclined wall portion 22 is annular and extends from the radially outer end of the first disk portion 21 in the other axial direction Da2 and radially outward Do. The radially outer end of the first inclined wall portion 22 is connected to one axial end of the cylindrical portion 24. The first inclined wall portion 22 may be omitted, in which case the radially outer end of the first disk portion 21 is connected to one axial end of the cylindrical portion 24.

[0030] The first flange portion 23 is annular and extends radially outward Do from the radially outer end of the first inclined wall portion 22.

[0031] The cylindrical portion 24 extends axially in Da, surrounding the stator 102. The rotor 104 includes the cylindrical portion 24. A rim 1 is positioned on the radially outer surface of the cylindrical portion 24, and the bottom portion 11 of the rim is fixed by fixing means such as welding. A yoke 3 is positioned on the radially inner surface of the cylindrical portion 24. The cylindrical portion 24 extends axially in Da2 from the radially outer end of the first flange portion 23. The second cover member 5 is fixed to the other axial end of the cylindrical portion 24 using a fixing member 6.

[0032] The first flange portion 23 may be omitted. In this case, the cylindrical portion 24 extends from the radially outer end of the first inclined wall portion 22 in the other axial direction Da2. Alternatively, if both the first flange portion 23 and the first inclined wall portion 22 are omitted, the cylindrical portion 24 extends from the radially outer end of the first disc portion 21 in the other axial direction Da2.

[0033] The cylindrical portion 24 has a protruding portion 25 and a hole portion 26. The protruding portion 25 protrudes radially outward Do. A fixing member 6 is connected to the hole portion 26. Figure 3 is a perspective view showing an example of the arrangement of the protruding portion 25 and the hole portion 26. Figure 4 is an enlarged view of the protruding portion 25 and the hole portion 26. Note that Figure 4 is an enlarged view of the portion IV enclosed by the dashed line in Figure 3.

[0034] The protrusions 25 are positioned at the axial end of the cylindrical portion 24. In this embodiment, the protrusions 25 are positioned at the other axial end of the cylindrical portion 24 and are arranged in a plurality at equal intervals in the circumferential direction Dr. However, this example does not exclude configurations in which at least some of the protrusions 25 are arranged at different intervals in the circumferential direction.

[0035] Each protruding portion 25 is provided with a hole 26 extending in the axial direction Da. The hole 26 extends in the axial direction Da from the end of the protruding portion 25 on the side of the second cover portion 5 in the axial direction Da. In this embodiment, the hole 26 extends in the axial direction Da1 from the end of the protruding portion 25 on the other axial direction Da2 side. For example, the hole 26 is a female screw portion into which the male screw portion (for example, portion 61) of the fixing member 6 is screwed.

[0036] The fixing member 6 for fixing the second cover member 5 to the cylindrical portion 24 is positioned in the hole 26, which is located in the protruding portion 25 of the cylindrical portion 24. The protruding portion 25 is a part that locally protrudes radially outward from the cylindrical portion 24. Therefore, the radially outer surface of the portion of the cylindrical portion 24 other than the protruding portion 25 is located radially inward Di than the radially outer surface of the protruding portion 25. As a result, it is possible to prevent an increase in the radial thickness of the cylindrical portion 24 and the radial size of the portion other than the protruding portion 25 in the portion of the cylindrical portion 24 other than the protruding portion 25. In addition, the radial thickness of the yoke 3 can be made thinner compared to the case where the hole 26 is positioned at the axial end of the yoke 3. Thus, it is possible to prevent an increase in the weight of the yoke 3 and cylindrical portion 24 due to the positioning of the hole 26. As a result, the motor 100 can be made lighter.

[0037] Preferably, the inner diameter D of the hole 26 is greater than the radial thickness of the yoke 3, for example, greater than the radial thickness W of the portion of the yoke 3 that is located at a different circumferential position from the hole 26. In Figure 4, the radial thickness W is the radial thickness of the thickest portion of the yoke 3. By setting D > W, the radial thickness W of the yoke 3 can be made thinner, thus making the magnetic yoke 3 lighter. Consequently, the motor 100 can be made lighter. In addition, the outer diameter of the (male screw) portion 61 placed in the hole 26 of the fixing member 6 can be made sufficiently large, so the cover member can be fixed to the cylindrical portion 24 with sufficient strength. However, this example does not exclude configurations where D ≤ W.

[0038] As shown in Figure 3, there are multiple holes 26. Preferably, the holes 26, together with the protrusions 25, are arranged at equal intervals in the circumferential direction Dr. This allows the second cover member 5 to be fixed to the cylindrical portion 24 without bias in the circumferential direction Dr. However, this example does not exclude configurations in which at least some of the holes 26 are arranged at different intervals in the circumferential direction Dr.

[0039] The first bearing holder 27 is cylindrical and surrounds the shaft 101, and is positioned at the radially inner end of the first disc portion 21. The first bearing holder 27 holds the first bearing 271 and rotatably supports the shaft 101 via the first bearing 271. (See Figure 1)

[0040] The first end cap 28 is positioned on the inner circumferential surface of the first bearing holder 27, axially one side Da1 relative to the first bearing 271 (see Figure 1). The first end cap 28 is annular in shape and surrounds the shaft 101, covering the space between the shaft 101 and the first bearing holder 27. The first end cap 28 prevents dust, liquids, etc. from entering the inside of the motor 100 through the space between the shaft 101 and the first bearing holder 27.

[0041] In this embodiment, the rim 1 and the first cover member 2 are configured as separate components. However, the invention is not limited to this example, and both may be configured as a single component. In particular, the cylindrical portion 24 of the first cover member 2 may be integrated with the rim bottom portion 11 of the rim 1. This reduces the number of parts in the rotor 104 and the manufacturing process for the rim 1 and the first cover member 2. Consequently, the manufacturing cost of the motor 100 can be reduced, and its productivity can be improved.

[0042] The yoke 3 is positioned on the radially inner surface of the cylindrical portion 24 and surrounds the stator 102. The yoke 3 holds the magnet 4 on its radially inner surface. As described above, the rotor 104 has the yoke 3. The yoke 3 is formed using a magnetic material and is fixed to the radially inner end of the cylindrical portion 24. In this embodiment, the yoke 3 is cylindrical and extends in the axial direction Da. However, it is not limited to this example, and the yoke 3 does not have to be cylindrical. For example, the yoke 3 may be configured such that it is arc-shaped when viewed from the axial direction Da, and multiple yoke pieces extending in the axial direction Da are arranged in the circumferential direction Dr.

[0043] The magnet 4 is positioned on the radially inner surface of the yoke 3. In the magnet 4, opposing magnetic poles (N pole and S pole) are arranged alternately in the circumferential direction Dr. As described above, the rotor 104 has the magnet 4. The magnet 4 surrounds the central axis CA extending in the axial direction Da. The magnet 4 may be an annular member surrounding the central axis CA, or it may be a configuration that includes a plurality of magnetic pieces arranged in the circumferential direction Dr.

[0044] <1-4-3. Second cover member 5> The second cover member 5 is an annular shape that surrounds the shaft 101. The second cover member 5 expands in the radial direction Dd and is positioned at the axial end of the cylindrical portion 24. The second cover member 5 is an example of the "cover member" of the present invention. As described above, the rotor 104 is equipped with the second cover member 5. In this embodiment, the second cover member 5 expands in a direction intersecting the axial direction Da (for example, in the radial direction Dd) and is positioned at the other axial end of the cylindrical portion 24.

[0045] The second cover member 5 includes a second disc portion 51, a second inclined wall portion 52, a second flange portion 53, a second bearing holder 54, a second bearing 541, and a second end cap 55.

[0046] The second disc portion 51 is an annular shape that surrounds the shaft 101. The second disc portion 51 is positioned in the axial direction Da2 opposite to the stator 102 and extends in a direction intersecting the axial direction Da (for example, the radial direction Dd).

[0047] The second inclined wall portion 52 is annular and extends from the radially outer end of the second disk portion 51 in one axial direction Da1 and radially outward Do.

[0048] The second flange portion 53 is annular in shape, extending radially outward Do from the radially outer end of the second inclined wall portion 52, and is fixed to the other axial end of the cylindrical portion 24 by the fixing member 6.

[0049] An opening 531 is provided in the second flange portion 53. The opening 531 penetrates the second flange portion 53 in the axial direction Da and leads to the hole 26. In this embodiment, there are multiple openings 531, which are arranged in the circumferential direction Dr.

[0050] The second inclined wall portion 52 and the second flange portion 53 may be omitted. In this case, the radially outer end of the second disc portion 51 is connected to the other axial end of the cylindrical portion 24. The opening 531 is located at the radially outer end of the second disc portion 51. In other words, the radially outer end of the second disc portion 51 functions as the second flange portion 53.

[0051] The second bearing holder 54 is cylindrical and surrounds the shaft 101, and is positioned at the radially inner end of the second disc portion 51. The second bearing holder 54 holds the second bearing 541 and rotatably supports the shaft 101 via the second bearing 541.

[0052] The second end cap 55 is positioned on the inner circumferential surface of the second bearing holder 54, axially opposite to the second bearing 541 by Da2. The second end cap 55 is annular in shape, surrounding the shaft 101 and covering the space between the shaft 101 and the second bearing holder 54. The second end cap 55 prevents dust, liquids, etc. from entering the inside of the motor 100 through the space between the shaft 101 and the second bearing holder 54.

[0053] <1-4-4. Fixing Member 6> The fixing member 6 fixes the second cover member 5 to the cylindrical portion 24. As described above, the rotor 104 has a fixing member 6. The fixing member 6 is fixed to the hole portion 26. In this embodiment, the fixing member 6 is a bolt. The hole portion 26 is a female screw portion. The head 62 of the fixing member 6 is positioned on the other axial Da2 side of the second flange portion 53. The (male screw) portion 61 of the fixing member 6 is inserted through the opening 531 and screwed into the hole portion 26.

[0054] <1-5. Configuration of the protruding portion 25> Next, the configuration of the protruding portion 25 will be described with reference to Figures 4 to 6. Figure 5 is a perspective view showing a first modified example of the protruding portion 25. Figure 6 is a perspective view showing a second modified example of the protruding portion 25. Figures 5 and 6 correspond to the portion IV enclosed by the dashed line in Figure 3.

[0055] For example, as shown in Figure 4, the projection 25 has a protruding wall portion 251. The protruding wall portion 251 is recessed radially outward Do and extends axially Da, and is spaced apart from the radially outer surface of the yoke 3 and faces radially Dd.

[0056] Furthermore, the projection 25 has a sleeve 252. The sleeve 252 is cylindrical and surrounds the hole 26, extending in the axial direction Da. The hole 26 is located in the space surrounded by the projection 25 and the yoke 3. The sleeve 252 is also positioned between the protruding wall 251 and the radially outer surface of the yoke 3, and is in contact with the protruding wall 251 and the yoke 3 in the radial direction Dd. The sleeve 252 may be fixed between the protruding wall 251 and the radially outer surface of the yoke 3 by press fitting, or by means of adhesive, welding, brazing, etc.

[0057] By positioning the sleeve 252 between the protruding wall portion 251 and the radially outer surface of the yoke 3, the hole 26 in which the fixing member 6 is placed can be positioned on the radially outward Do side of the yoke 3 with a simple configuration. This effect is particularly useful, for example, when the cylindrical portion 24 is manufactured by press molding.

[0058] In the portion of the yoke 3 that contacts the sleeve 252, the yoke 3 has a recess 31. The recess 31 is located on the radially outer surface of the yoke 3 and is recessed radially inward Di. The radially inward Di side of the sleeve 252 is positioned in the recess 31. Preferably, the recess 31 is recessed radially inward Di along the circumferential surface of the sleeve 252. This makes it easy to position the sleeve 252 in the circumferential Dr. Furthermore, by recessing radially inward Di along the outer circumferential surface of the sleeve 252, rattling of the sleeve 252 and rotation when positioning the fixing member 6 can be suppressed or prevented.

[0059] On the other hand, preferably, no irregularities are formed on the radial inner surface of the yoke 3. For example, the radial distance between the radial inner surface of the yoke 3 and the central axis CA is constant over the entire circumferential direction Dr. More preferably, the radius of curvature of the radial inner surface of the yoke 3 is constant when viewed from the axial direction Da. This way, the radial inner surface of the yoke 3 does not protrude radially inward Di, regardless of the arrangement of the holes 26 (or sleeve 252) on the radially outward side Do. Thus, for example, it is possible to prevent the magnet 4, which is positioned on the radial inner surface of the yoke 3, from locally approaching the stator 102 in the circumferential direction Dr.

[0060] Furthermore, the protruding portion 25 has a bottom portion 253. The bottom portion 253 covers and closes one axial end of the space enclosed by the protruding wall portion 251 and the yoke 3. Note that the bottom portion 253 may be omitted.

[0061] Furthermore, on at least one of the circumferential sides of the sleeve 252, the protruding wall portion 251 is separated from the yoke 3 in the radial direction Dd. As a result, the protruding wall portion 251 and the yoke 3 together form a gap with the sleeve 252. For example, in Figure 4, the above-mentioned gap is arranged on both sides in the circumferential direction. In this way, it is not necessary for all of the outer surface of the sleeve 252 other than the portion in contact with the yoke 3 to be in contact with the protruding wall portion 251, thus simplifying the shape of the protruding wall portion 251 as viewed from the axial direction Da. In addition, by placing adhesive or the like in the above-mentioned gap, the sleeve 252 can be fixed more firmly, and for example, when fixing the fixing member 6 by screwing it in, the entire sleeve 252 can be reliably prevented from rotating.

[0062] Furthermore, in Figure 4, the sleeve 252 is cylindrical. However, this example does not exclude configurations in which the sleeve 252 is not cylindrical. In other words, the outer shape of the sleeve 252 as viewed from the axial direction Da may be circular or n-sided (where n is a positive integer of 3 or more). As shown in Figure 5, if the outer shape is circular, a cylindrical member or a cylindrical wire with a hole drilled in the axial direction Da can be used for the sleeve 252. In other words, the sleeve 252 can be easily procured. Also, if the outer shape is n-sided, it is easier to prevent the sleeve 252 from rotating between the protruding wall portion 251 and the yoke 3, even without fixing means such as adhesive.

[0063] The hole 26 may extend in one axial direction Da1 from the other axial end of the solid projection 25. In Figure 6, the projection 25 protrudes radially outward Do from the radial outer surface of the yoke 3 and extends in one axial direction Da1. The radial inner surface of the projection 25 is in contact with the yoke 3.

[0064] The hole 26 extends axially from the end of the projection 25 on the second cover member 5 side in the axial direction Da, and in this embodiment, it extends axially from the other end of the projection 25 in the axial direction Da1. This allows the hole 26 to be placed at the axial end of the solid projection 25. For example, the hole 26 can be easily formed by drilling the projection 25.

[0065] <2. Others> Embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the embodiments described above. The present invention can be implemented by making various modifications to the embodiments described above without departing from the spirit of the invention. Furthermore, the matters described in the embodiments described above can be combined as appropriate and arbitrarily as long as they do not create contradictions.

[0066] For example, in the embodiment described above, the cylindrical portion 24 is a component of the first cover member 2. However, the invention is not limited to this example, and the cylindrical portion 24 does not have to be a component of the first cover member 2. Furthermore, the cylindrical portion 24 may be connected to components of the first cover member 2 other than the cylindrical portion 24 (for example, the first flange portion 23) by fixing members 6 such as bolts, similar to the second cover member 5. Figure 7 is a cross-sectional view showing a modified example of the connection of the cover members. Note that Figure 7 corresponds to the configuration of part VII enclosed by the dashed line in Figure 1. For example, as shown in Figure 7, the first cover member 2 and the second cover member 5 may each be connected to the cylindrical portion 24 at both axial ends of the cylindrical portion 24 by the placement of fixing members 6 in the holes 26 (for example, by screwing in bolts). In this case, the first cover member 2 and the second cover member 5 are examples of the "cover members" of the present invention.

[0067] <3. Summary> The embodiments and their variations described above will be summarized below.

[0068] For example, the motor disclosed herein is A rotor having magnets surrounding a central axis extending in the axial direction, and which is rotatable about the central axis, A stator positioned radially inward from the aforementioned magnet, Equipped with, The rotor is A cylindrical portion extending axially around the stator, A yoke is positioned on the radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface, A cover member that extends radially and is positioned at the axial end of the cylindrical portion, A fixing member for fixing the cover member to the cylindrical portion, It has, The cylindrical portion is A protruding portion that extends radially outward, The hole through which the aforementioned fixing member is connected, It has, The hole extends axially from the end of the protrusion on the cover member side in the axial direction. This is considered the first configuration.

[0069] Furthermore, the motor in the first configuration described above is The inner diameter of the hole may be set to be larger than the radial thickness of the yoke (second configuration).

[0070] Furthermore, the motor of the first or second configuration described above, The aforementioned protrusion is A protruding wall portion that is recessed radially outward and extends axially, and is spaced apart from the radially outer surface of the yoke and faces radially, A cylindrical sleeve that surrounds the aforementioned hole and extends in the axial direction, It has, The sleeve may be positioned between the protruding wall and the radially outer surface of the yoke, and may be configured to be in radial contact with the protruding wall and the yoke (third configuration).

[0071] Furthermore, the motor in the third configuration described above is The protruding wall portion may be configured to be radially separated from the yoke on at least one of the circumferential sides of the sleeve (fourth configuration).

[0072] Furthermore, the motor of the third or fourth configuration described above, The outer shape of the sleeve, as viewed from the axial direction, may be circular or an n-sided polygon (where n is a positive integer of 3 or more) (fifth configuration).

[0073] Furthermore, a motor having any of the above configurations 3 to 5 is, The yoke has a recess on which the radially inward side of the sleeve is positioned. The recess may be located on the radially outer surface of the yoke and recessed radially inward (sixth configuration).

[0074] Furthermore, the motor of the first or second configuration described above, The radially inner surface of the protruding portion is in contact with the yoke, The hole may be configured to extend axially from the end of the protrusion on the cover member side in the axial direction (seventh configuration).

[0075] Furthermore, a motor having any of the above configurations 1 to 7 is, The radial distance between the radially inner surface of the yoke and the central axis may be constant throughout the entire circumferential region (the eighth configuration).

[0076] Furthermore, a motor having any of the above configurations 1 to 8 is, The yoke may be configured such that the radius of curvature of the radially inner surface is constant when viewed from the axial direction (the ninth configuration).

[0077] Furthermore, a motor having any of the above configurations from the first to the ninth is, The aforementioned holes may be multiple in number and arranged at equal intervals in the circumferential direction (the tenth configuration).

[0078] Furthermore, the vehicle disclosed herein is configured to include a motor with any of the first to ten configurations described above (the eleventh configuration). [Industrial applicability]

[0079] The present invention is useful, for example, in a motor in which a disc-shaped cover member is connected to a cylindrical portion where a rim is located. [Explanation of symbols]

[0080] 100...Motor, 101...Shaft, 102...Stator, 1021...Stator core, 1022...Insulator, 1023...Coil section, 103...Stator holder, 1031...Inner cylinder section, 1032...Holder cylinder section, 1033...Connecting section, 104...Rotor, 1...Rim, 11...Rim cylinder section, 2...Number 1 Cover member, 21...First disc section, 22...First inclined wall section, 23...First flange section, 24...Cylinder section, 25...Protruding section, 251...Protruding wall section, 252...Sleeve, 253...Bottom section, 26...Hole section, 27...First bearing holder, 271...First bearing, 28...First end cap, 3...Yoke, 31... ...concave, 4...magnet, 5...second cover member, 51...second disc section, 52...second inclined wall section, 53...second flange section, 531...opening, 54...second bearing holder, 541...second bearing, 55...second end cap, 6...fixing member, 61...male screw section, 62...head, 200...vehicle, 201...Front wheel, 202...Rear wheel, 2021...Tire, 203...Body, 204...Handlebar, 205...ECU, 206...Battery, CA...Center axis, Da...Axial direction, Da1...One axial direction, Da2...Other axial direction, Dd...Radial direction, Di...Inward radial direction, Do...Outward radial direction, Dr...Circumferential direction

Claims

1. A rotor having magnets surrounding a central axis extending in the axial direction, and which is rotatable about the central axis, A stator positioned radially inward from the aforementioned magnet, The rim on which the tire is mounted, Equipped with, The rotor is A cylindrical portion extending axially around the stator, A yoke is positioned on the radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface, A cover member that extends radially and is positioned at the axial end of the cylindrical portion, A fixing member for fixing the cover member to the cylindrical portion, It has, The cylindrical portion is A protruding portion that extends radially outward, The hole through which the aforementioned fixing member is connected, It has, The aforementioned hole extends axially from the end of the protrusion on the cover member side in the axial direction, The rim has a cylindrical rim bottom that extends in the axial direction, The rim bottom is fixed to the radially outer surface of the cylindrical portion, and is a motor.

2. A rotor having magnets surrounding a central axis extending in the axial direction, and which is rotatable about the central axis, A stator positioned radially inward from the aforementioned magnet, The rim on which the tire is mounted, Equipped with, The rotor is A cylindrical portion extending axially around the stator, A yoke is positioned on the radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface, A cover member that extends radially and is positioned at the axial end of the cylindrical portion, A fixing member for fixing the cover member to the cylindrical portion, It has, The cylindrical portion is A protruding portion that extends radially outward, The hole through which the aforementioned fixing member is connected, It has, The aforementioned hole extends axially from the end of the protrusion on the cover member side in the axial direction, The rim has a cylindrical rim bottom that extends in the axial direction, The motor wherein the protrusion is aligned axially with the bottom of the rim and is positioned radially inward from the portion of the rim on the protrusion side in the axial direction.

3. A rotor having magnets surrounding a central axis extending in the axial direction, and which is rotatable about the central axis, A stator positioned radially inward from the aforementioned magnet, The rim on which the tire is mounted, Equipped with, The rotor is A cylindrical portion extending axially around the stator, A yoke is positioned on the radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface, A cover member that extends radially and is positioned at the axial end of the cylindrical portion, A fixing member for fixing the cover member to the cylindrical portion, It has, The cylindrical portion is A protruding portion that extends radially outward, The hole through which the aforementioned fixing member is connected, It has, The aforementioned hole extends axially from the end of the protrusion on the cover member side in the axial direction, The rim has a cylindrical rim bottom that extends in the axial direction, The rim bottom is integrated with the cylindrical portion, and the motor.

4. A rotor having magnets surrounding a central axis extending in the axial direction, and which is rotatable about the central axis, A stator positioned radially inward from the aforementioned magnet, Equipped with, The rotor is A cylindrical portion extending axially around the stator, A yoke is positioned on the radially inner surface of the cylindrical portion, surrounding the stator, and holding the magnet on the radially inner surface, A cover member that extends radially and is positioned at the axial end of the cylindrical portion, A fixing member for fixing the cover member to the cylindrical portion, It has, The cylindrical portion is A protruding portion that extends radially outward, The hole through which the aforementioned fixing member is connected, It has, The aforementioned hole extends axially from the end of the protrusion on the cover member side in the axial direction, The aforementioned protrusion is A protruding wall portion that is recessed radially outward and extends axially, and is spaced apart from the radially outer surface of the yoke and faces radially, A cylindrical sleeve that surrounds the aforementioned hole and extends in the axial direction, It has, The sleeve is positioned between the protruding wall portion and the radially outer surface of the yoke, and is in radial contact with the protruding wall portion and the yoke, in the motor.

5. The motor according to any one of claims 1 to 4, wherein the inner diameter of the hole is greater than the radial thickness of the yoke.

6. The motor according to claim 4, wherein the protruding wall portion is radially separated from the yoke on at least one of the circumferential sides of the sleeve.

7. The yoke has a recess on which the radially inward side of the sleeve is positioned. The motor according to claim 4 or claim 6, wherein the recess is located on the radially outer surface of the yoke and is recessed radially inward.

8. The radially inner surface of the protruding portion is in contact with the yoke, The motor according to any one of claims 1 to 3, wherein the hole extends axially from the end of the protrusion on the cover member side in the axial direction.

9. The motor according to any one of claims 1 to 4, wherein the radial distance between the radial inner surface of the yoke and the central axis is constant over the entire circumferential region.

10. The motor according to any one of claims 1 to 4, wherein the holes are plurality and arranged at equal intervals in the circumferential direction.

11. A vehicle comprising the motor according to any one of claims 1 to 4.

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