Motor vehicle

Abstract

A motor and a vehicle are provided. The motor includes a reduction device and a hub rotatable about a center axis. The reduction device has a ring gear surrounding the center axis and rotatable about the center axis. The ring gear has a first contact portion. The hub has a disc hub surrounding the center axis. The disc hub has a disc portion and a second contact portion. The disc portion is disposed on one of axial sides of the ring gear, surrounds the center axis, and extends in a radial direction. The second contact portion is disposed on the other axial side of the disc portion and is contactable with the first contact portion in a circumferential direction.

Description

Technical Field

[0001] This invention relates to a motor and a vehicle. Background Technology

[0002] Previously, hub motors mounted on the front wheel of electric bicycles were known. The power of the hub motor is transmitted to the hub, which rotates together with the tire, via a reduction device such as a planetary gear mechanism (see, for example, Japanese Patent Application Publication No. 2019-38480).

[0003] The output gear of the reduction gear (e.g., the internal gear of a planetary gear mechanism) is axially connected to the hub, for example, by screwing. To secure the two together, sufficient space must be provided for the output gear to be screwed into the output section of the reduction gear.

[0004] [Existing Technical Documents]

[0005] [Patent Literature]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 2019-38480 Summary of the Invention

[0007] [The problem the invention aims to solve]

[0008] However, if the space is guaranteed, it is difficult to increase the number of teeth on the output gear, thus making it difficult to improve the torque transmission efficiency from the reduction gear to the hub. For example, in the case of an internal gear, it is difficult to increase the number of teeth on the radially inward side. Therefore, it is difficult to output a larger torque from the internal gear to the hub.

[0009] The purpose of this invention is to improve the efficiency of torque transmission from the deceleration device to the wheel hub.

[0010] [Technical means to solve the problem]

[0011] An exemplary motor of the present invention includes a main shaft, a rotor, a stator, a reduction gear, and a hub. The main shaft extends along a central axis that extends axially. The rotor is rotatable about the central axis and rotates with the main shaft. The stator is radially opposite to the rotor. The reduction gear is connected to the main shaft. The hub is rotatable about the central axis. The reduction gear has a ring gear. The ring gear surrounds the central axis and is rotatable about the central axis. The ring gear has a first contact portion. The hub has a disc hub surrounding the central axis. The disc hub has a disc portion and a second contact portion. The disc portion is disposed further axially than the ring gear, surrounds the central axis, and extends radially. The second contact portion is disposed on the other axial side of the disc portion and is circumferentially in contact with the first contact portion.

[0012] The exemplary vehicle of the present invention includes the motor.

[0013] [The effects of the invention]

[0014] According to the exemplary motors and vehicles of the present invention, the efficiency of torque transmission from the reduction gear to the wheel hub can be improved. Attached Figure Description

[0015] Figure 1 This is a cross-sectional view of the motor.

[0016] Figure 2 This is an external view of the motor.

[0017] Figure 3 This is an exploded perspective view of the wheel hub and the ring gear.

[0018] Figure 4 This is an external view of the other side of the disc hub along its axial direction.

[0019] Figure 5 This is an external view of the assembly of the disc hub and the ring gear.

[0020] Figure 6 This diagram illustrates the connection structure between the first contact portion and the second contact portion.

[0021] Figure 7 A schematic diagram of a vehicle equipped with a motor.

[0022] [Explanation of Symbols]

[0023] 1: Motor

[0024] 2: Spindle

[0025] 3: Rotor

[0026] 4: Stator

[0027] 5: Stator retainer

[0028] 6: Speed ​​reduction device

[0029] 7: Wheel hub

[0030] 31: One-way clutch

[0031] 32: Rotor core

[0032] 33: Magnet

[0033] 41: Stator core

[0034] 42: Insulator

[0035] 43: Coil section

[0036] 51, 611, 713, 725: Bearing retainers

[0037] 52: Bracket

[0038] 53: Holder section

[0039] 54: Substrate

[0040] 61: Base

[0041] 62: Sun Gear

[0042] 63: Planetary Axis

[0043] 64: Planetary Carrier

[0044] 65: Planetary Gear

[0045] 66: Small gear

[0046] 67: Ring gear

[0047] 71: Disc hub

[0048] 72: Wheel hub section

[0049] 81: Concave

[0050] 82: convex part

[0051] 83: Adhesive

[0052] 84: Notch

[0053] 100: Vehicles

[0054] 110: Vehicle body

[0055] 111: Front fork

[0056] 112, 113: Axles

[0057] 114: Pedal

[0058] 120: Front wheel

[0059] 121: Spokes

[0060] 122: Wheel rim

[0061] 123: Tires

[0062] 130: Rear wheel

[0063] 140: Handle

[0064] 150: Battery

[0065] 511, 6111, 7131, 7251: Bearings

[0066] 521: Support section

[0067] 612: Base plate section

[0068] 613: Base tube section

[0069] 671, 721: Cylinder section

[0070] 672, 7221, 7222: Flange portion

[0071] 673: First Contact Section

[0072] 711: Disc Section

[0073] 712: Second Contact Section

[0074] 714: Connecting Part

[0075] 723: Ribs

[0076] 724: Base Plate

[0077] 6731: First recess

[0078] 6732: First convex part

[0079] 6733: First Gap

[0080] 7121: Second recess

[0081] 7122: Second convex part

[0082] 7123: Second gap

[0083] CX: Central axis

[0084] Da: One of the axes

[0085] Db: Axial direction on the other side

[0086] d1, d2a, d2b: Radial width

[0087] h1: Axial width

[0088] W1a, W1b, W2a, W2b: Circumferential width Detailed Implementation

[0089] Hereinafter, exemplary embodiments will be described with reference to the accompanying drawings.

[0090] Furthermore, in this specification, the direction parallel to the central axis CX, which serves as the center of rotation of the motor 1, is referred to as the "axial direction." Within the axial direction, the direction from the rotor 3 (described later) toward the disc hub 71 is referred to as "one axial direction Da," and the direction from the disc hub 71 toward the rotor 3 is referred to as "the other axial direction Db." Moreover, the direction orthogonal to the central axis CX is referred to as the "radial direction," and the direction of rotation centered on the central axis CX is referred to as the "circumferential direction." Within the radial direction, the direction approaching the central axis CX is referred to as the "radial inward direction," and the direction moving away from the central axis CX is referred to as the "radial outward direction."

[0091] Furthermore, in this specification, "ring-shaped" includes not only a shape that is continuously connected throughout the entire direction around a specified axis such as the central axis CX, but also a shape that has more than one break in a portion of the entire region centered on the axis. It also includes a shape in which a closed curve is drawn in a surface intersecting the central axis CX, centered on the axis.

[0092] Furthermore, in the positional relationship between any two of the orientations, lines, and planes and any other, "parallel" not only refers to a state where the two never intersect no matter where they extend, but also includes a state where they are substantially parallel. Moreover, "perpendicular" and "orthogonal" not only include a state where the two intersect at 90 degrees, but also include states where they are substantially perpendicular and substantially orthogonal, respectively. That is, "parallel," "perpendicular," and "orthogonal" respectively include states where the positional relationship between the two has an angular deviation that does not deviate from the spirit of this invention.

[0093] Furthermore, these are merely illustrative names and are not intended to define actual positional relationships, directions, or names.

[0094] <1. Motor 1>

[0095] Figure 1 This is a cross-sectional view of motor 1. Figure 2 This is an external view of motor 1. Figure 1 This represents the cross-sectional structure of motor 1 cut by an imaginary plane containing the central axis CX.

[0096] Motor 1 includes main shaft 2, rotor 3, stator 4, stator retainer 5, reduction gear 6 and hub 7.

[0097] <1-1. Main Axis 2>

[0098] The main shaft 2 is cylindrical in shape and rotatable about the central shaft CX. As described above, the motor 1 includes the main shaft 2. The main shaft 2 extends axially along the central shaft CX. Furthermore, the central shaft CX extends axially. On the radially outer surface of the main shaft 2, the rotor 3 and the sun gear 62 of the reduction gear 6 (described later) are disposed. The main shaft 2 rotatably supports the rotor 3 and the sun gear 62.

[0099] <1-2. Rotor 3>

[0100] The rotor 3 can rotate together with the main shaft 2 around a central shaft CX extending axially. As described above, the motor 1 includes a rotor 3. The rotor 3 has a one-way clutch 31, a rotor core 32, and a magnet 33. The one-way clutch 31 is a cylindrical shape surrounding the central shaft CX and is fixed to the radially outer side of the main shaft 2. The rotor core 32 is fixed to the radially outer end of the one-way clutch 31, surrounds the main shaft 2, and extends axially. The rotor core 32 is formed using a magnetic material and functions as a yoke for the magnet 33. In this embodiment, the rotor core 32 is a laminate formed by stacking radially extending annular electromagnetic steel plates axially. The magnet 33 is disposed on the radially outer side of the rotor core 32. In the magnet 33, different magnetic poles (N pole and S pole) are arranged alternately in the circumferential direction. The magnet 33 can be an annular component surrounding the central shaft CX or a structure containing multiple circumferentially arranged magnetic plates.

[0101] <1-3. Stator 4>

[0102] The stator 4 and rotor 3 face each other radially. As described above, the motor 1 includes a stator 4. The stator 4 is positioned radially outward from the rotor 3. The stator 4 has a stator core 41, an insulator 42, and multiple coil sections 43. The stator core 41 is formed using a magnetic material, and in this embodiment, it is a laminate formed by stacking electromagnetic steel sheets axially. The insulator 42 is formed of an electrically insulating material such as resin. The coil section 43 is a component in which wires (not shown) are arranged in the stator core 41 with the insulator 42 in between. Furthermore, the wires are, for example, enamel-coated copper wires, metal wires coated with insulating components, etc., and are wound around the stator core 41 to form the coil section 43. When a drive current is supplied to each coil section 43, the stator 4 is energized and drives the rotor 3.

[0103] <1-4. Stator Holder 5>

[0104] The stator retainer 5 holds the stator 4. The stator retainer 5 has a cylindrical bearing retainer 51, a bearing 511, a bracket 52, a retainer portion 53, and a base plate 54. The bearing retainer 51 surrounds the central shaft CX and extends axially. The end of the main shaft 2 on the other side (Db) of the axial direction is inserted into the bearing retainer 51. Furthermore, the bearing 511 is disposed on the radially inner surface of the bearing retainer 51. The bearing retainer 51 rotatably supports the end of the main shaft 2 on the other side (Db) of the axial direction via the bearing 511. The bracket 52 extends radially outward from the end of the bearing retainer 51 on the other side (Db) of the axial direction. The end of the axle 113 on one side (Da) of the axial direction is connected to the bracket 52. Furthermore, the axle 113 extends from the bracket 52 towards the other side (Db) of the axial direction. The retainer portion 53 extends circumferentially from the radially outer end of the bracket 52 towards one side (Da) of the axial direction. The retainer portion 53 surrounds the end of the stator 4 on the other axial side (Db). The end of the stator core 41 on the other axial side (Db) is fixed to the radially inner surface of the retainer portion 53. The substrate 54 is positioned radially outward from the bearing retainer 51 and extends radially. The substrate 54 houses various electronic components such as the drive unit of the stator 4 and is supported by a support portion 521 that protrudes from the bracket 52 towards one axial side (Da).

[0105] <1-5. Speed ​​Reduction Device 6>

[0106] The reduction gear 6 is connected to the main shaft 2. As described above, the motor 1 includes the reduction gear 6. In fact, the input side of the reduction gear 6 is connected to the main shaft 2. The output side of the reduction gear 6 is connected to the hub 7. In this embodiment, the reduction gear 6 is a planetary gear mechanism that reduces the rotation of the rotor 3 transmitted from the main shaft 2 at a predetermined reduction ratio and transmits it to the hub 7. The reduction gear 6 has a base 61, a sun gear 62, multiple planetary main shafts 63, a planet carrier 64, multiple planetary gears 65, multiple pinions 66, and a ring gear 67. The ring gear 67 will be described below.

[0107] The base 61 is fixed to one axial end (Da side) of the stator 4, supporting the other axial end (Db side) of each planetary spindle 63. The base 61 has a cylindrical bearing holder 611, a bearing 6111, a base plate portion 612, and a base cylinder portion 613. The bearing holder 611 surrounds the central shaft CX and extends axially. The spindle 2 is inserted through the bearing holder 611. Furthermore, the bearing 6111 is disposed on the radially inner surface of the bearing holder 611. The bearing holder 611 rotatably supports the spindle 2 via the bearing 6111. The base plate portion 612 extends radially outward from one axial end (Da side) of the bearing holder 611. The other axial end (Db side) of the axle 112 (described later) is connected to the base plate portion 612. Furthermore, the axle 112 extends from the base plate portion 612 towards one axial side (Da side). Furthermore, the base cylinder portion 613 extends circumferentially from the radially outer end of the base plate portion 612 toward the other axial direction Db. The base cylinder portion 613 surrounds one of the axial ends of the stator 4 on the Da side. The end of the stator core 41 on the Da side of the axial direction is fixed to the radially inner surface of the base cylinder portion 613.

[0108] The sun gear 62 is fixed to the radial outer surface of the main shaft 2 and can rotate together with the main shaft 2 around the central axis CX. The sun gear 62 can be integrated with the main shaft 2, or it can be separate from the main shaft 2 and firmly fixed to the radial outer surface of the main shaft 2.

[0109] Planetary spindles 63 are arranged radially outward of the sun gear 62, along the radially outer end of the sun gear 62. The planetary spindles 63 are arranged circumferentially around the central axis CX and extend axially. One axial end of the planetary spindle 63, on the Da side, is connected to the planet carrier 64. The other axial end of the planetary spindle 63, on the Db side, is connected to the base plate 612.

[0110] On the radially outer surface of each planetary spindle 63, a planetary gear 65 and a pinion 66 are rotatably disposed. The planetary gear 65 and the pinion 66 are arranged circumferentially around the central axis CX.

[0111] The planetary carrier 64 is connected to the end of the axle 112 on the opposite axial side (Db side), and supports the end of each planetary spindle 63 on one axial side (Da side). Furthermore, the axle 112 is positioned further axially than the spindle 2 on one axial side (Da side) and extends axially. The planetary carrier 64 is positioned further axially than the base 61 on one axial side (Da side) and extends radially outward from the axle 112.

[0112] Planetary gear 65 and pinion 66 are disposed axially between base 61 and planet carrier 64. Furthermore, planetary gear 65 is arranged around sun gear 62 and meshes with sun gear 62. Planetary gear 65, for example, can rotate about planetary spindle 63 relative to base 61.

[0113] The pinion 66 is located on one of the axial sides (Da) of the planetary gear 65, coaxially arranged with the planetary gear 65, and can rotate together with the planetary gear 65. In this embodiment, the pinion 66 is integral with the planetary gear 65, but it can also be separate from the planetary gear 65. Each pinion 66 meshes with a ring gear 67.

[0114] <1-6. Ring Gear 67>

[0115] Next, refer to Figures 1 to 3 The ring gear 67 will be described. Figure 3 This is an exploded perspective view of the hub 7 and the ring gear 67. In this embodiment, the ring gear 67 is a so-called internal gear of a planetary gear mechanism. The ring gear 67 surrounds the central shaft CX and can rotate around the central shaft CX. As described above, the reduction gear 6 includes the ring gear 67. The ring gear 67 is positioned radially outward than the pinion 66 and meshes with the pinion 66. Furthermore, the ring gear 67 is connected to the hub 7, transmitting the output of the reduction gear 6 to the hub 7. The connection structure between the ring gear 67 and the hub 7 will be described below.

[0116] The ring gear 67 has a cylindrical portion 671 and a flange portion 672. The cylindrical portion 671 is cylindrical about a central axis CX and extends axially, surrounding the planet carrier 64 and a plurality of pinions 66. A plurality of teeth (not shown) arranged circumferentially are disposed on the radially inner surface of the cylindrical portion 671. The plurality of teeth mesh with each pinion 66. Thus, depending on the rotation of the pinions 66, the ring gear 67 rotates circumferentially about the central axis CX. The flange portion 672 extends radially outward from the radially outer end of the cylindrical portion 671 and extends circumferentially; in this embodiment, it is annular, surrounding the cylindrical portion 671.

[0117] Furthermore, the ring gear 67 also has a first contact portion 673. The first contact portion 673 is disposed at one of the axial ends, Da side, of the flange portion 672, and makes circumferential contact with the second contact portion 712 of the disc hub 71, which will be described later. Details of the first contact portion 673 will be described below.

[0118] In this embodiment, the ring gear 67 is made of resin. This design makes the ring gear 67 lighter compared to a metal ring gear 67, and the first contact portion 673 is easily elastically deformable in the circumferential direction. Therefore, even if there are areas where the first contact portion 673 and the second contact portion 712 do not contact due to tolerances when no torque is applied between them in the circumferential direction, applying torque between them will allow the elastic deformation of the first contact portion 673 to bring them into contact at those areas. Therefore, a decrease in the torque transmission efficiency of the ring gear 67 to the disc hub 71 can be prevented. However, this embodiment does not preclude the possibility of the ring gear 67 being made of a material other than resin.

[0119] <1-7. Wheel Hub 7>

[0120] Next, refer to Figures 1 to 5 The wheel hub 7 will be explained. Figure 4 This is an external view of the disc hub 71 on the other side of the axial direction, Db. Figure 5 This is an external view of the assembly of the ring gear 67 and the disc hub 71. The hub 7 is rotatable about the central shaft CX. As described above, the motor 1 includes the hub 7. The rotation of the rotor 3 is transmitted from the ring gear 67 to the hub 7 via the main shaft 2 and the reduction gear 6. The hub 7 is made of a metal such as aluminum or its alloy.

[0121] The hub 7 has a disc hub 71 and a bottom cylindrical hub section 72.

[0122] A disc hub 71 is connected to a ring gear 67. As described above, hub 7 has a disc hub 71. The disc hub 71 is disc-shaped, surrounding a central axis CX. The disc hub 71 has a disc portion 711 and a second contact portion 712. The disc portion 711 is disposed axially further away from the ring gear 67 on one side Da, surrounding the central axis CX and extending radially. The second contact portion 712 is disposed on the other axial side Db of the disc portion 711 and can circumferentially contact the first contact portion 673. For example, when the ring gear 67 rotates circumferentially, one circumferential end of the second contact portion 712 circumferentially contacts the other circumferential end of the first contact portion 673. Furthermore, when no torque is applied to the ring gear 67, the second contact portion 712 may or may not circumferentially contact the first contact portion 673. By making the first contact portion 673 of the ring gear 67 circumferentially contact the second contact portion 712 of the disc hub 71, the rotation of the ring gear 67 can be transmitted to the disc hub 71. Therefore, even without the portion that axially connects the ring gear 67 of the reduction gear 6 to the disc hub 71, rotation can be transmitted from the rotor 3 to the hub 7 via the main shaft 2 and the reduction gear 6. Thus, the torque transmission efficiency from the reduction gear 6 to the hub 7 can be improved. Furthermore, details of the second contact portion 712 will be described below.

[0123] Furthermore, the disc hub 71 also includes a bearing retainer 713, a bearing 7131, and a connecting portion 714. The bearing retainer 713 surrounds the central shaft CX and extends axially. An axle 112 is inserted into the bearing retainer 713. Moreover, the bearing 7131 is disposed on the radially inner side of the bearing retainer 713. The bearing retainer 713 rotatably supports the axle 112 via the bearing 7131.

[0124] A connecting portion 714 is disposed at the radially outer end of the disc portion 711 and is axially connected to the hub cylinder portion 72. In this embodiment, there are multiple connecting portions 714, which are arranged circumferentially along the radially outer end of the disc portion 711.

[0125] The hub cylinder portion 72 surrounds the annular gear 67 and the second contact portion 712, and extends axially. As described above, the hub 7 has the hub cylinder portion 72. One axial end of the hub cylinder portion 72, on the Da side, is connected to the radially outer end of the disc portion 711. That is, one axial end of the hub cylinder portion 72, on the Da side, is covered by the disc hub 71. The hub cylinder portion 72 internally houses the rotor 3, the stator 4, the stator holder 5, and the reduction gear 6.

[0126] The hub cylinder portion 72 includes a cylinder portion 721, a flange portion 7221, a flange portion 7222, a base plate 724, a bearing retainer 725, and a bearing 7251.

[0127] The cylindrical portion 721 is a cylindrical shape that surrounds the rotor 3, stator 4, stator holder 5, and reduction gear 6, and extends axially. One of the axial ends, Da side, of the cylindrical portion 721 is connected to the connecting portion 714. Thus, one of the axial ends, Da side, of the hub cylindrical portion 72 is connected to the disc hub 71.

[0128] Flange portions 7221 and 7222 are disposed on the radially outer surface of the cylindrical portion 721, extending radially outward from the cylindrical portion 721 and extending circumferentially. In this embodiment, flange portions 7221 and 7222 are annular surrounding the cylindrical portion 721. Flange portion 7221 is disposed on one axial side (Da) of the cylindrical portion 721. Flange portion 7222 is disposed on the other axial side (Db) of the cylindrical portion 721.

[0129] Rib 723 protrudes radially inward from the radially inner end of hub cylindrical portion 72 (specifically cylindrical portion 721) and extends circumferentially. As described above, hub cylindrical portion 72 has rib 723. Rib 723 is positioned further axially than the ring gear 67 on the opposite side Db, overlapping the radially outer end of the ring gear 67 (particularly cylindrical portion 671) when viewed axially. In other words, the radially inner end of rib 723 is positioned radially inward than the radially outer end of the ring gear 67 (particularly cylindrical portion 671). With this configuration, rib 723 can be used to prevent the ring gear 67 from moving axially on the opposite side Db.

[0130] Moreover, in this embodiment, such as Figure 3 As shown, there are multiple ribs 723, and the gaps are arranged circumferentially. With this arrangement, when assembling the motor 1, the ribs 723 do not obstruct the installation of components positioned on the opposite side (Db) of the axial direction from the ribs 723. For example, when installing the reduction gear 6 after mounting the hub cylinder 72 on the motor 1, the planetary gear 65 can pass through the gaps, thus avoiding contact with the ribs 723. However, this example does not exclude structures where the ribs 723 are a single structure, or structures where there are no gaps between the multiple circumferential ribs 723. For example, the ribs 723 may also be annular, surrounding the central shaft CX.

[0131] The base plate 724 extends radially inward from the end of the cylindrical portion 721 on the opposite side of the axial direction (Db). The base plate 724 is a circular plate shape that surrounds the axle 113 and is positioned further on the opposite side of the axial direction (Db) than the stator retainer 5.

[0132] The bearing retainer 725 is a cylindrical shape extending axially from the radially inner end of the base plate 724. An axle 113 is inserted into the bearing retainer 725. Furthermore, a bearing 7251 is disposed on the radially inner surface of the bearing retainer 725. The bearing retainer 725 rotatably supports the axle 113 via the bearing 7251.

[0133] In this embodiment, the cylindrical portion 721, flange portion 7221, flange portion 7222, rib 723, base plate 724, and bearing holder 725 are integrated. However, not limited to the example described, at least one of these may be separate from the other.

[0134] <1-8. First contact portion 673 and second contact portion 712>

[0135] Next, refer to Figure 1 and Figures 3 to 6 The first contact portion 673 and the second contact portion 712 will be described in detail. Figure 6 This diagram illustrates the connection structure between the first contact portion 673 and the second contact portion 712. Furthermore, Figure 6 Viewing the connection structure of the two from the radially outward to the radially inward perspective, and... Figure 5 The part VI is enclosed by the dashed line.

[0136] In this embodiment of the ring gear 67, the first contact portion 673 has a plurality of first recesses 6731 and a plurality of first protrusions 6732. The first recesses 6731 and the first protrusions 6732 are disposed on the end face of one of the axial directions, Da side, of the flange portion 672. The first recesses 6731 are recessed in the other axial direction, Db, and extend radially. In other words, the first recesses 6731 are spaces disposed between circumferentially adjacent first protrusions 6732. The first protrusions 6732 protrude in one of the axial directions, Da, and extend radially. In other words, the first protrusions 6732 are portions of the flange portion 672 disposed between circumferentially adjacent first recesses 6731.

[0137] Furthermore, in this embodiment, the second contact portion 712 of the disc hub 71 has a plurality of second recesses 7121 and a plurality of second protrusions 7122. The second recesses 7121 and second protrusions 7122 are disposed in the radially outer region of the end face on the axially opposite side (Db) of the disc portion 711. The second recesses 7121 are recessed in one axial direction (Da) and extend radially. In other words, the second recesses 7121 are spaces disposed between circumferentially adjacent second protrusions 7122. The second protrusions 7122 protrude in the axially opposite direction (Db) and extend radially. In other words, the second protrusions 7122 are portions of the disc portion 711 disposed between circumferentially adjacent second recesses 7121.

[0138] The first protrusion 6732 is disposed inside the second recess 7121, in other words, it is disposed between circumferentially adjacent second protrusions 7122. When the ring gear 67 rotates in one circumferential direction, one circumferential end face of the first protrusion 6732 contacts the inner side of the second recess 7121 facing the other circumferential direction, in other words, it contacts the other circumferential end face of the second protrusion 7122.

[0139] The second protrusion 7122 is disposed inside the first recess 6731, in other words, it is disposed between the circumferentially adjacent first protrusions 6732. When the ring gear 67 rotates in one circumferential direction, one circumferential end face of the second protrusion 7122 contacts the inner side of the first recess 6731 facing the other circumferential direction, in other words, it contacts the other circumferential end face of the first protrusion 6732.

[0140] Adhesive 83 may also be filled between the first protrusion 6732 and the second recess 7121 or the second protrusion 7122 (in other words, between the first recess 6731 or the first protrusion 6732 and the second protrusion 7122). That is, adhesive 83 may also be filled between the first contact portion 673 and the second contact portion 712. If configured in this way, the adhesive 83 can be used to firmly fix the first contact portion 673 and the second contact portion 712. Therefore, the ring gear 67 can be more firmly connected to the disc hub 71. Therefore, the torque transmission efficiency of the ring gear 67 to the disc hub 71 can be further improved. However, the above example does not exclude a structure in which adhesive 83 is not filled between the first contact portion 673 and the second contact portion 712.

[0141] Furthermore, the examples of this embodiment do not exclude structures where at least one of the first protrusion 6732 and the first recess 6731 is a single structure, or structures where the first contact portion 673 has only one of the first protrusion 6732 and the first recess 6731. Moreover, the examples of this embodiment do not exclude structures where at least one of the second protrusion 7122 and the second recess 7121 is a single structure, or structures where the second contact portion 712 has only one of the second protrusion 7122 and the second recess 7121.

[0142] Furthermore, either the first recess 6731 or the second recess 7121 is sometimes referred to as "recess 81". Also, the one of the first protrusion 6732 or the second protrusion 7122 disposed inside the recess 81 is sometimes referred to as "protrusion 82".

[0143] At the connection between the disc hub 71 and the ring gear 67, one of the first contact portion 673 and the second contact portion 712 has an axially recessed recess 81. Furthermore, the recess 81 is a first recess 6731 when one of them is the first contact portion 673, and a second recess 7121 when one of them is the second contact portion 712. Moreover, the other of the first contact portion 673 and the second contact portion 712 has a protrusion 82. The protrusion 82 protrudes axially and is disposed inside the recess 81. Furthermore, the protrusion 82 is a second protrusion 7122 when the other is the second contact portion 712, and a first protrusion 6732 when the other is the first contact portion 673. Through the meshing of the recess 81 and the protrusion 82, when the ring gear 67 rotates, the inner surface of the recess 81 facing one circumferential direction contacts the other circumferential end face of the protrusion 82. Thus, the rotation of the ring gear 67 in one of the circumferential directions can be transmitted to the disc hub 71.

[0144] Preferably, the minimum circumferential width of the recess 81 is wider than the maximum circumferential width of the protrusion 82. For example, the minimum circumferential width W1a of the first recess 6731 is wider than the maximum circumferential width W2b of the second protrusion 7122. Furthermore, the minimum circumferential width W2a of the second recess 7121 is wider than the maximum circumferential width W1b of the first protrusion 6732. With this configuration, the protrusion 82 is more easily inserted into the recess 81 compared to a structure where the maximum circumferential width of the protrusion 82 is the same as or wider than the minimum circumferential width of the recess 81. Therefore, the disc hub 71 can be mounted on the annular gear 67 more easily. Moreover, the protrusion 82 can be inserted into the recess 81 more smoothly. For example, the possibility of the protrusion 82 getting stuck on the inner side of the recess 81 can be prevented. Alternatively, sliding between the circumferentially facing inner side of the recess 81 and the circumferential end face of the protrusion 82 can be prevented. Therefore, wear on the recess 81 and the protrusion 82 during engagement can be prevented.

[0145] Preferably, when the ring gear 67 rotates in one circumferential direction, the entire area of ​​the inner surface of the first recess 6731 facing one circumferential direction contacts the other circumferential end face of the second protrusion 7122. Furthermore, in the at least one first protrusion 6732, the entire area of ​​one circumferential end face of the first protrusion 6732 contacts the inner surface of the second recess 7121 facing the other circumferential direction (or the other circumferential end face of the second protrusion 7122). That is, in the at least one first contact portion 673, the entire area of ​​the circumferential end face of the first contact portion 673 facing the second contact portion 712 contacts the second contact portion 712. By making the contact area between the first contact portion 673 and the second contact portion 712 wider, the torque transmission efficiency of the ring gear 67 to the disc hub 71 can be improved. However, the above illustration does not exclude the structure in which the entire circumferential end face of the first contact portion 673 facing the second contact portion 712 does not contact the second contact portion 712.

[0146] Furthermore, preferably, the inner surface of the second recess 7121 facing one of the circumferential directions is wider than the other circumferential end face of the first protrusion 6732. Also, one circumferential end face of the second protrusion 7122 is wider than the inner surface of the first recess 6731 facing the other of the circumferential directions (or the other circumferential end face of the first protrusion 6732). That is, the circumferential end face of the second contact portion 712 on the first contact portion 673 side is wider than the circumferential end face of the first contact portion 673 on the second contact portion 712 side. For example, the radial widths d2a and d2b of the second recess 7121 or the second protrusion 7122 may also be wider than the radial width d1 of the first recess 6731 or the first protrusion 6732. Furthermore, the axial width h2 of the second recess 7121 or the second protrusion 7122 may also be wider than the axial width h1 of the first recess 6731 or the first protrusion 6732. If configured in this way, the area of ​​the circumferential end face of the second contact portion 712 of the disc hub 71 can be wider than the contact area of ​​the contact portion between the first contact portion 673 and the second contact portion 712. Therefore, at least one of the radial width d2a, radial width d2b, and axial width h2 of the circumferential end face of the second contact portion 712 can be wider than the contact portion. Therefore, even if there are errors in the size or position of the second contact portion 712, a reduction in the contact area can be prevented. Therefore, a decrease in the torque transmission efficiency of the ring gear 67 of the disc hub 71 can be prevented. However, this example does not exclude structures where the area of ​​the circumferential end face of the second contact portion 712 on the first contact portion 673 side is less than or equal to the area of ​​the circumferential end face of the first contact portion 673 on the second contact portion 712 side.

[0147] One of the first recess 6731 and the second protrusion 7122 is arranged at equal intervals in the circumferential direction. Preferably, both the first recess 6731 and the second protrusion 7122 are arranged at equal intervals in the circumferential direction. In other words, one of the first protrusion 6732 and the second recess 7121 is arranged at equal intervals in the circumferential direction. Preferably, both the first protrusion 6732 and the second recess 7121 are arranged at equal intervals in the circumferential direction. That is, at least one of the first contact portion 673 and the second contact portion 712 is arranged in multiple circumferentially at equal intervals. If this is configured, circumferential deviation of the torque acting between the ring gear 67 and the disc hub 71 can be suppressed or prevented during the rotation of the ring gear 67. However, the above example does not exclude structures in which multiple first contact portions 673 and multiple second contact portions 712 are not arranged at equal intervals in the circumferential direction.

[0148] In this embodiment, the first protrusion 6732 has a first notch 6733. The first notch 6733 is disposed in the top portion of the first protrusion 6732 between one axial end face (Da side) and one circumferential end face, and between one axial end face (Da side) and the other circumferential end face. Alternatively, the first notch 6733 may be disposed only between one axial end face (Da side) and one circumferential end face, and between one axial end face (Da side) and the other circumferential end face. The first notch 6733 is a portion with a curved surface or a flat surface disposed between the axial end face (Da side) and the circumferential end face of the first protrusion 6732. For example, the first notch 6733 may be a portion with a so-called round chamfering (R-shaped chamfering) or a portion with a so-called beveling (C-shaped chamfering). In the case of round chamfering, a curved surface is disposed between the axial end face (Da side) and the circumferential end face. Viewed radially, the curved surface protrudes circumferentially toward one of the axial directions, Da, and extends radially. In the case of the C chamfer, the angle is obliquely cut between the end face on the axial side Da and the circumferential end face, and a plane is arranged that obliquely intersects the axial direction and extends radially.

[0149] Furthermore, the second protrusion 7122 has a second notch 7123. The second notch 7123 is disposed in the top portion of the second protrusion 7122 between one end face on the axially opposite Db side and one of the circumferential end faces, and between the end face on the axially opposite Db side and the other circumferential end face. Alternatively, the second notch 7123 may be disposed only between the end face on the axially opposite Db side and one of the circumferential end faces, and between the end face on the axially opposite Db side and the other circumferential end face. The second notch 7123 is a portion with a curved surface or a flat surface disposed between the end face on the axially opposite Db side and the circumferential end face of the second protrusion 7122. For example, the second notch 7123 may be a portion with a so-called R-chamfering, or it may be a portion with a so-called C-chamfering. In the case of R-chamfering, a curved surface is disposed between the end face on the axially opposite Db side and the circumferential end face. Viewed radially, the curved surface faces the opposite direction of the axial direction Db and protrudes circumferentially, extending radially. In the case of the C-bevel, the angle is obliquely cut between the end face on the opposite side of the axial direction Db and the circumferential end face, and a plane is arranged that obliquely intersects the axial direction and extends radially.

[0150] In addition, at least one of the first notch 6733 and the second notch 7123 is sometimes referred to as "notch 84".

[0151] Not limited to the example described, either the first notch 6733 or the second notch 7123 may be omitted. That is, at least one of the first contact portion 673 and the second contact portion 712 may also have a notch 84 disposed between the axial end face and the circumferential end face. For example, the notch 84 is disposed in the top portion of the protrusion 82 between the axial end face and the circumferential end face. By disposing of the notch 84, when at least one of the first contact portion 673 and the second contact portion 712 is moved axially to contact the other in the circumferential direction, the angle between the axial end face and the circumferential end face does not touch the other, thus facilitating contact between the two. For example, in the fitting of the recess 81 and the protrusion 82, by disposing of the notch at the top of the protrusion 82, the protrusion 82 is easily disposed inside the recess 81. Furthermore, as will be described later, when the first contact portion 673 and the second contact portion 712 are bonded together using adhesive 83, a space for the adhesive 83 to remain can be formed in the notch portion 84. Thus, for example, the adhesive 83 is less likely to seep out from between the two.

[0152] Furthermore, it is preferable that the radial width d2b of the portion on the other axial Db side of the second protrusion 7122 (or the second recess 7121) is narrower than the radial width d2a of the portion on one axial Da side. That is, the radial width d2b of the portion on the other axial Db side of the second contact portion 712 is narrower than the radial width d2a of the portion on one axial Da side of the second contact portion 712. If this is configured, the radial width d2b of the annular gear 67 side of the second contact portion 712 is narrower than the radial width d2a of the disc portion 711 side. Therefore, it is easy to arrange the second contact portion 712 inside the hub cylinder portion 72 (i.e., cylinder portion 721). Therefore, the hub cylinder portion 72 can be easily connected to the disc hub 71. However, the above example does not exclude a structure in which the radial width d2b of the annular gear 67 side of the second contact portion 712 is greater than or equal to the radial width d2a of the disc portion 711 side.

[0153] Furthermore, in this embodiment, in at least one first protrusion 6732, the end of the first protrusion 6732 on one axial side (Da) is in axial contact with the bottom surface of the second recess 7121 facing the other axial side (Db). However, not limited to the above example, in at least one second protrusion 7122, the end of the second protrusion 7122 on the other axial side (Db) may also be in axial contact with the bottom surface of the first recess 6731 facing one axial side (Da). That is, the axial end of either the first contact portion 673 or the second contact portion 712 is in axial contact with the other component of the ring gear 67 and the disc hub 71, which has both the first contact portion 673 and the second contact portion 712. Through such axial contact, the axial position of the other relative to one of the ring gear 67 and the disc hub 71 can be easily determined. However, the illustration does not exclude a structure in which the first contact portion 673 and the disc hub 71 are not in axial contact in all first contact portions 673, or a structure in which the second contact portion 712 and the ring gear 67 are not in axial contact in all second contact portions 712. Furthermore, the illustration does not exclude a structure in which, in at least one first protrusion 6732, the end portion of the first protrusion 6732 on one axial direction (Da) is in axial contact with the bottom surface of the second recess 7121 facing the other axial direction (Db), and in at least one second protrusion 7122, the end portion of the second protrusion 7122 on the other axial direction (Db) is in axial contact with the bottom surface of the first recess 6731 facing one axial direction (Da).

[0154] <2. Vehicles 100>

[0155] In this embodiment, motor 1 is a so-called hub motor, which is mounted on vehicle 100. Figure 7 A schematic diagram of a vehicle 100 equipped with motor 1. Figure 7The vehicle 100 is an electric-assisted bicycle. However, this embodiment does not exclude the possibility of mounting the motor 1 in a vehicle 100 other than an electric-assisted bicycle.

[0156] like Figure 7 As shown, the vehicle 100 includes a motor 1. In the vehicle 100, even if the motor 1 is not equipped with a connecting part that axially connects the ring gear 67 of the reduction gear 6 (described later) to the disc hub 71, the rotation of the rotor 3 can be transmitted from the reduction gear 6 to the hub 7.

[0157] The vehicle 100 also includes a body 110, a front wheel 120, a rear wheel 130, a handlebar 140, and a battery 150.

[0158] The vehicle body 110 includes a fork 111 and axles 112 and 113 of the front wheel 120. The fork 111 supports the front wheel 120 via axles 112 and 113. One end of axles 112 and 113 is connected to the motor 1 of the front wheel 120. The other end of axles 112 and 113 is non-rotatably supported at the top of the fork 111.

[0159] A front wheel 120 and handlebars 140 are mounted at the front of the vehicle body 110. The front wheel 120 has a motor 1, multiple spokes 121, a rim 122, and a tire 123. The spokes 121 are arranged circumferentially and support the rim 122 for the motor 1. The rim 122 is an annular component surrounding the central shaft CX and the motor 1. The radially inner ends of the spokes 121 are fixed to the motor 1 (specifically, flanges 7221 and 7222). The radially outer ends of the spokes 121 are fixed to the radially inner ends of the rim 122. The tire 123 is mounted on the radially outer end of the rim 122.

[0160] A rear wheel 130 is rotatably mounted at the rear of the vehicle body 110. The rear wheel 130 rotates according to the force applied by the user to the pedal 114.

[0161] Furthermore, a battery 150 is installed in the vehicle body 110. The battery 150 is a rechargeable battery that supplies power to the motor 1.

[0162] In vehicle 100, the tire 123 of front wheel 120 rotates around the central axis CX as the rear wheel 130 rotates. The resulting torque around the central axis CX is transmitted to motor 1 via wheel rim 122 and spokes 121. This torque is transmitted to rotor 3 via hub 7, ring gear 67, reduction gear 6, and main shaft 2, causing rotor 3 to rotate around the central axis CX. Motor 1 has a sensor (not shown) that detects the rotation of at least one of the following: main shaft 2, rotor 3, gears 65, 66, and planetary carrier 64 of reduction gear 6, ring gear 67, and hub 7. Motor 1 rotates rotor 3 in one or the other circumferential direction around the central axis CX as needed. The torque of rotor 3 is added to the torque required to drive vehicle 100. That is, motor 1 provides the torque required to assist the driving of vehicle 100 as needed.

[0163] <3. Other>

[0164] The embodiments of the present invention have been described above. However, the scope of the present invention is not limited to the described embodiments. Various modifications can be made to the embodiments without departing from the spirit of the invention. Furthermore, the items described in the embodiments can be appropriately combined arbitrarily without causing contradictions.

[0165] [Industrial Applicability]

[0166] This invention is useful, for example, for a device that transmits the rotation of a rotor to a rotatable component.

Claims

1. A motor, comprising: The main shaft extends along the central axis that extends axially. The rotor is capable of rotating together with the main shaft around the central axis. The stator is radially opposite to the rotor; A speed reduction device is connected to the main shaft; as well as The hub is capable of rotating around the central axis. The speed reduction device includes: a ring gear surrounding the central shaft, capable of rotating about the central shaft. The ring gear has a first contact portion. The hub has a disc hub surrounding the central axis. The disc hub has: The disk portion, disposed more axially than the annular gear, surrounds the central axis and extends radially; and The second contact portion is disposed on the other side of the axial direction of the disk portion, and is capable of circumferential contact with the first contact portion, and One of the first contact portion and the second contact portion has a recessed portion in the axial direction. The other of the first contact portion and the second contact portion has a protrusion that protrudes axially and is disposed inside the recess.

2. The motor according to claim 1, wherein, The minimum circumferential width of the recess is wider than the maximum circumferential width of the protrusion.

3. A motor, comprising: The main shaft extends along the central axis that extends axially. The rotor is capable of rotating together with the main shaft around the central axis. The stator is radially opposite to the rotor; A speed reduction device is connected to the main shaft; as well as The hub is capable of rotating around the central axis. The speed reduction device includes: a ring gear surrounding the central shaft, capable of rotating about the central shaft. The ring gear has a first contact portion. The hub has a disc hub surrounding the central axis. The disc hub has: The disk portion, disposed more axially than the annular gear, surrounds the central axis and extends radially; and The second contact portion is disposed on the other side of the axial direction of the disk portion, and is capable of circumferential contact with the first contact portion, and At least one of the first contact portion and the second contact portion has a notch disposed between the axial end face and the circumferential end face.

4. A motor, comprising: The main shaft extends along the central axis that extends axially. The rotor is capable of rotating together with the main shaft around the central axis. The stator is radially opposite to the rotor; A speed reduction device is connected to the main shaft; as well as The hub is capable of rotating around the central axis. The speed reduction device includes: a ring gear surrounding the central shaft, capable of rotating about the central shaft. The ring gear has a first contact portion. The hub has a disc hub surrounding the central axis. The disc hub has: The disk portion, disposed more axially than the annular gear, surrounds the central axis and extends radially; and The second contact portion is disposed on the other side of the axial direction of the disk portion, and is capable of circumferential contact with the first contact portion, and In at least one of the first contact portions, the entire circumferential end face of the first contact portion facing the second contact portion is in contact with the second contact portion.

5. A motor, comprising: The main shaft extends along the central axis that extends axially. The rotor is capable of rotating together with the main shaft around the central axis. The stator is radially opposite to the rotor; A speed reduction device is connected to the main shaft; as well as The hub is capable of rotating around the central axis. The speed reduction device includes: a ring gear surrounding the central shaft, capable of rotating about the central shaft. The ring gear has a first contact portion. The hub has a disc hub surrounding the central axis. The disc hub has: The disk portion, disposed more axially than the annular gear, surrounds the central axis and extends radially; and The second contact portion is disposed on the other side of the axial direction of the disk portion, and is capable of circumferential contact with the first contact portion, and The circumferential end face of the second contact portion on the first contact portion side is wider than the circumferential end face of the first contact portion on the second contact portion side.

6. A motor, comprising: The main shaft extends along the central axis that extends axially. The rotor is capable of rotating together with the main shaft around the central axis. The stator is radially opposite to the rotor; A speed reduction device is connected to the main shaft; as well as The hub is capable of rotating around the central axis. The speed reduction device includes: a ring gear surrounding the central shaft, capable of rotating about the central shaft. The ring gear has a first contact portion. The hub has a disc hub surrounding the central axis. The disc hub has: The disk portion, disposed more axially than the annular gear, surrounds the central axis and extends radially; and The second contact portion is disposed on the other side of the axial direction of the disk portion, and is capable of circumferential contact with the first contact portion, and The hub further comprises: a hub cylindrical portion surrounding the annular gear and the second contact portion, extending axially. One of the axial ends of the hub cylinder is connected to the radial outer end of the disk portion. The radial width of the portion on the other side of the axial direction of the second contact portion is narrower than the radial width of the portion on one side of the axial direction of the second contact portion.

7. The motor according to claim 6, wherein, The hub cylinder portion has: ribs that project radially inward at their radially inner end and extend circumferentially. The rib is positioned further axially than the annular gear and overlaps with the radial outer end of the annular gear when viewed axially.

8. The motor according to claim 7, wherein, The ribs are multiple, and the gaps are arranged circumferentially.

9. A motor, comprising: The main shaft extends along the central axis that extends axially. The rotor is capable of rotating together with the main shaft around the central axis. The stator is radially opposite to the rotor; A speed reduction device is connected to the main shaft; as well as The hub is capable of rotating around the central axis. The speed reduction device includes: a ring gear surrounding the central shaft, capable of rotating about the central shaft. The ring gear has a first contact portion. The hub has a disc hub surrounding the central axis. The disc hub has: The disk portion, disposed more axially than the annular gear, surrounds the central axis and extends radially; and The second contact portion is disposed on the other side of the axial direction of the disk portion, and is capable of circumferential contact with the first contact portion, and The axial end of either the first contact portion or the second contact portion is in axial contact with a component in the ring gear and the disc hub having the other of the first contact portion and the second contact portion.

10. The motor according to any one of claims 1 to 9, wherein, The material of the ring gear is resin.

11. The motor according to any one of claims 1 to 9, wherein, An adhesive is filled between the first contact portion and the second contact portion.

12. The motor according to any one of claims 1 to 9, wherein, At least one of the first contact portion and the second contact portion is provided with a plurality of portions at equal intervals in the circumferential direction.

13. A vehicle comprising: The motor as described in any one of claims 1 to 12.

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