ENGINE AND VEHICLE

Abstract

Motor (1), comprising a wave (2) extending along a central axis (CX) running in one axial direction; a rotor (3) which, together with the shaft (2), is rotatable about the central axis (CX); a stator (4) which is opposite the rotor (3) in a radial direction; a reduction device (6) connected to the shaft (2); and a hub (7) which is rotatable about the central axis (CX); wherein the reduction device (6) comprises an annular gear (67) that surrounds the central axis (CX) and is rotatable about the central axis (CX), wherein the ring-shaped gear (67) comprises a first contact section, wherein the hub (7) comprises a disc hub (71) that surrounds the central axis (CX), the disc hub (71) comprises a disc section which is arranged further along the axial direction than the annular gear (67) on one side, surrounds the central axis (CX) and extends radially around the central axis (CX), and a second contact section which is arranged on the other side in the axial direction of the disk section and which can come into contact with the first contact section in the circumferential direction, wherein one of the first contact section and the second contact section comprises a recessed depression in the axial direction, wherein the other comprises a projection extending in the axial direction from the first contact section and the second contact section, which is arranged inside the recess.

Description

Technical field

[0001] The present invention relates to an engine and a vehicle. General state of the art

[0002] A hub motor integrated into the front wheel of an electric bicycle is a conventionally known design. The driving force of the hub motor is transmitted via a reduction device, such as a planetary gear, to the hub, which rotates as one unit with the wheel and the like (see, for example, patent disclosure 2019-38480).

[0003] The output gear of the reduction gear (for example, the internal gear of the planetary gear) is coupled to the hub, for example, by means of screws in the axial direction. For the screw fastening of the two elements, it is necessary to ensure sufficient space on the output gear for the screw fastening to the output section of the reduction gear. Literature on precursor technologies, patent literature

[0004] Patent literature example 1: Patent disclosure JP 2019 - 38 480 A. Further motors are known from CN 2 01 312 196 Y, WO 2014 / 087 653 A1, US 2005 / 0 264 111 A1, DE 10 2016 123 047 A1, US 8 419 581 B2 and CN 1 03 661 776 A. Brief description of the invention; Problem that the invention is intended to solve

[0005] However, if the aforementioned space is ensured, it becomes difficult to increase the number of teeth on the output gear and therefore to improve the efficiency of torque transmission from the reduction gear to the hub. For example, in the case of the internal gear, it becomes difficult to increase the number of teeth on the inner face in the radial direction. Therefore, it is difficult to output an even greater torque from the internal gear to the hub.

[0006] The present invention aims to improve the efficiency of the transmission of torque from the reduction device to the hub. Means of solving the problem

[0007] The present invention is defined by the appended independent claims. Advantageous embodiments are described in the dependent claims. An exemplary motor of the present invention is shown.

[0008] An exemplary vehicle of the present invention is equipped with the engine described above. Result of the invention

[0009] The exemplary motor and exemplary vehicle of the present invention can improve the efficiency of the transmission of torque from the reduction device to the hub. Simple explanation of the drawings Fig. 1: Fig. Figure 1 is a sectional view of the engine. Fig. 2: Fig. Figure 2 shows the appearance of the engine. Fig. 3: Fig. Figure 3 is a disassembled oblique view of the hub and the ring-shaped gear. Fig. 4: Fig. Figure 4 shows the appearance of the disc hub on the other side in the axial direction. Fig. 5: Fig. Figure 5 shows the appearance of the assembly consisting of the disc hub and the ring-shaped gear. Fig. 6: Fig. Figure 6 is a view showing the contact setup of the first contact segment and the second contact segment. Fig. 7: Fig. Figure 7 is a schematic view of a vehicle into which the engine is installed. Forms for carrying out the invention

[0010] An exemplary embodiment is explained below with reference to the drawings.

[0011] In this description, a direction parallel to a central axis CX, the center of rotation of the motor 1, is referred to as the "axis direction." A direction of the axis direction facing a later-described rotor 3 toward a disk hub 71 is referred to as "one side Da in the axis direction," and a direction facing the disk hub 71 toward the rotor 3 is referred to as "other side Db in the axis direction." A direction orthogonal to the central axis CX is referred to as the "radial direction," and a direction of rotation with the central axis CX as its center is referred to as the "circumferential direction." A direction of the radial direction leading toward the central axis CX is referred to as the "inside in the radial direction," and a direction leading away from the central axis CX is referred to as the "outside in the radial direction."

[0012] In the present description, a "ring shape" includes not only a shape that forms a continuous connection without any gaps along the entire area in the direction around the circumference of a specific axis, such as the central axis CX, but also a shape that has at least one gap in a portion of the entire area with said axis as its center. Furthermore, it also includes a shape that describes a closed curve with said axis as its center on a curved surface that intersects the central axis CX.

[0013] Regarding the positional relationship between one element from a direction, line, or surface and another thereof, "parallel" encompasses not only a state in which the two never intersect, but also a substantially parallel state. Similarly, "vertical" and "orthogonal" encompass not only a state in which the two intersect at an angle of 90°, but also a substantially vertical state and a substantially orthogonal state, respectively. That is to say, "parallel," "vertical," and "orthogonal" each encompass a state in which the positional relationship between the two exhibits an angular deviation of a magnitude that does not deviate from the main content of the present invention.

[0014] However, these terms are used only for description and are not intended to restrict the actual positional relationships, directions, and designations. <1. The engine 1>

[0015] Fig. Figure 1 is a sectional view of an engine. Fig. Figure 2 shows the appearance of engine 1. Fig. Figure 1 shows the cross-section of the motor 1 along a virtual plane containing the central axis CX.

[0016] The motor 1 has a shaft 2, a rotor 3, a stator 4, a stator holder 5, a reduction device 6 and a hub 7. <1-1. The Wave 2>

[0017] Shaft 2 has a column shape and is rotatable about the central axis CX. As mentioned above, the motor 1 is equipped with shaft 2. Shaft 2 extends along the central axis CX in the axial direction. The central axis CX runs in the axial direction. On an outer surface in the radial direction of shaft 2, the rotor 3 and a sun gear 62 of the reduction device 6 described later are arranged. Shaft 2 rotatably holds the rotor 3 and the sun gear 62. <1-2. The Rotor 3>

[0018] The rotor 3, together with the shaft 2, is rotatable about the central axis CX extending in the axial direction. As mentioned above, the motor 1 is equipped with the rotor 3. The rotor 3 has a one-way coupling 31, a rotor core 32, and magnets 33. The one-way coupling 31 has a tubular shape that surrounds the central axis CX and is fixed to the outer surface in the radial direction of the shaft 2. The rotor core 32 is fixed to the radially outer end region of the one-way coupling 31 and extends in the axial direction while surrounding the shaft 2. The rotor core 32 is formed using a magnetic material and acts as a yoke for the magnets 33. In the present embodiment, the rotor core 32 is a layered body for which annular magnetic steel plates extending in the radial direction have been stacked in the axial direction. The magnets 33 are arranged on the outer surface in the radial direction of the rotor core 32.Regarding the magnets 33, different magnetic poles (N-poles and S-poles) are arranged alternately in the circumferential direction. The magnets 33 can be ring-shaped elements surrounding the central axis CX, but can also be constructed such that they have several magnetic pieces arranged in the circumferential direction. <1-3. The stator 4>

[0019] The stator 4 is located radially opposite the rotor 3. As mentioned above, the motor 1 is equipped with the stator 4. The stator 4 is arranged radially on the outside of the rotor 3. The stator 4 comprises a stator core 41, an insulator 42, and several coil sections 43. The stator core 41 is formed using a magnetic material and, in the present embodiment, is a layered body for which magnetic steel plates have been stacked in the axial direction. The insulator 42 is formed from a material possessing electrical insulating properties, such as a resin. The coil sections 43 are elements for which conducting wires (not shown) have been arranged on the stator core 41 via the insulator 42. The conductor wires are, for example, enamelled copper wires, metal wires covered with an insulating material, or the like, which form the coil sections 43 by winding them onto the stator core 41.When a drive current is supplied to the individual coil sections 43, the stator 4 is excited and the rotor 3 is driven to rotate. <1-4. The stator holder 5>

[0020] The stator holder 5 supports the stator 4. The stator holder 5 comprises a tubular bearing holder 51, a bearing 511, a bracket 52, a holder section 53, and a plate 54. The bearing holder 51 surrounds the central axis CX and extends in the axial direction. The end on the opposite side Db in the axial direction of the shaft 2 is guided through the bearing holder 51. The bearing 511 is arranged on the inner side surface in the radial direction of the bearing holder 51. The bearing holder 51 allows the end on the opposite side Db in the axial direction of the shaft 2 to rotate via the bearing 511. The bracket 52 extends from the end on the opposite side Db in the axial direction of the bearing holder 51 to the outer side in the radial direction. The end on one side Da in the axial direction of a wheel axle 113, described later, is connected to the bracket 52. The wheel axle 113 runs from the bracket 52 to the other side Db in the axial direction.The holder section 53 extends radially from the outer end of the support 52 to one side Da in the axial direction and extends circumferentially. The holder section 53 surrounds the end on the other side Db in the axial direction of the stator 4. The end on the other side Db in the axial direction of the stator core 41 is fixed to the entire inner side surface in the radial direction of the holder section 53. The circuit board 54 is positioned radially further outward than the bearing support 51 and extends radially. The circuit board 54 carries various electronic components, such as a drive unit for the stator 4, and is held by a retaining section 521 that projects from the support 52 to one side Da in the axial direction. <1-5. The reduction device 6>

[0021] The reduction device 6 is connected to the shaft 2. As mentioned above, the motor 1 is equipped with the reduction device 6. Specifically, one input side of the reduction device 6 is connected to the shaft 2, and one output side is connected to the hub 7. In this embodiment, the reduction device 6 is a planetary gear and transmits the rotation of the rotor 3, transmitted by the shaft 2, to the hub 7 at a reduced speed by a specific reduction ratio. The reduction device 6 comprises a base 61, a sun gear 62, several planetary shafts 63, a planet carrier 64, several planet gears 65, several pinions 66, and an annular gear 67. The annular gear 67 will be explained later.

[0022] The base 61 is fixed at one end Da in the axial direction of the stator 4 and holds the ends at the other end Db in the axial direction of the individual planetary shafts 63. The base 61 comprises a tubular bearing holder 61, a bearing 6111, a base plate section 612, and a base tube section 613. The bearing holder 611 surrounds the central axis CX and extends in the axial direction. The shaft 2 is guided through the bearing holder 611. The bearing 6111 is arranged on the inner side surface in the radial direction of the bearing holder 611. The bearing holder 611 allows the shaft 2 to rotate via the bearing 6111. The base plate section 612 extends radially outward from the end at one end Da in the axial direction of the bearing holder 611. The end on the other side Db is connected to the base plate section 612 in the axial direction of a wheel axle 112 described later.The wheel axle 112 extends from the base plate section 612 to one side Da in the axial direction. The base tube section 613 extends from the outer end in the radial direction of the base plate section 612 to the other side Db in the axial direction and runs circumferentially. The base tube section 613 surrounds the end on one side Da in the axial direction of the stator 4. The end on one side Da in the axial direction of the stator core 41 is fixed to the inner side surface in the radial direction of the base tube section 613.

[0023] The sun gear 62 is fixed to the outer side surface of the shaft 2 in the radial direction and is rotatable together with the shaft about the central axis CX. The sun gear 62 can be formed integrally with the shaft 2 or be a separate element that is fixed to the outer side surface of the shaft 2 in the radial direction.

[0024] The planetary shafts 63 are arranged on the outside in the radial direction of the sun gear 62 along the outer end in the radial direction of the sun gear 62. The planetary shafts 63 are arranged with the central axis CX as their center in the circumferential direction and run in the axial direction. The ends on one side Da in the axial direction of the planetary shafts 63 are connected to the planet carrier 64. The ends on the other side Db in the axial direction of the planet carriers 63 are connected to the base plate section 612.

[0025] A planet gear 65 and a pinion 66 are rotatably mounted on the outer circumferential surface in the radial direction of each planetary shaft 63. The planet gears 65 and the pinions 66 are arranged side by side in the circumferential direction with the central axis CX as their center.

[0026] The planet carrier 64 is connected to the end of the wheel axle 112 (described later) on the other side Db in the axial direction and holds the end of each planet shaft 63 on one side Da in the axial direction. The wheel axle 112 is positioned further along the axial direction than the shaft 2 on one side Da and runs in the axial direction. The planet carrier 64 is positioned further along the axial direction than the base 61 on one side Da and extends radially outwards from the wheel axle 112.

[0027] The planet gears 65 and the pinions 66 are arranged axially between the base 61 and the planet carrier 64. The planet gears 65 are arranged around the sun gear 62 and mesh with the sun gear 62. The planet gears 65 are rotatable about the planet shafts 63, for example, with respect to the base 61.

[0028] The pinions 66 are arranged coaxially with the planet gears 65 on one side Da in the axial direction of the planet gears 65 and are rotatable together with the planet gears 65. In the present embodiment, the pinions 66 are integrally formed with the planet gears 65, but can also be separate elements. Each pinion 66 is meshed with the annular gear 67. <1-6. The ring-shaped gear 67>

[0029] Next, with reference to Fig. 1 to Fig. 3 explains the ring-shaped gear. Fig. Figure 3 is a disassembled oblique view of the hub 7 and the annular gear 67. In the present embodiment, the annular gear 67 is a so-called internal gear (an internal toothing) of the planetary gear set. The annular gear 67 surrounds the central axis CX and is rotatable about the central axis CX. As mentioned above, the reduction gear 6 is provided with the annular gear 67. The annular gear 67 is arranged radially further outward than the pinions 66 and is meshed with the pinions 66. Furthermore, the annular gear 67 is connected to the hub 7 and transmits the output of the reduction gear 6 to the hub. The connection between the annular gear 67 and the hub 7 will be explained later.

[0030] The annular gear 67 has a tubular section 671 and a flanged section 672. The tubular section 671 has a tubular shape with the central axis CX as its center, extends in the axial direction, and surrounds the planet carrier 64 and the multiple pinions 66. On the inner side surface in the radial direction of the tubular section 671, several teeth (not shown) are arranged in a circumferential sequence. The multiple teeth mesh with the individual pinions 66. As a result, the annular gear 67 rotates circumferentially about the central axis CX in accordance with the rotation of the pinions 66. The flanged section 672 extends circumferentially, while extending radially outward from the outer end in the radial direction of the tubular section 671, and in the present embodiment has an annular shape that surrounds the tubular section 671.

[0031] The annular gear 67 further comprises a first contact section 673. The first contact section 673 is arranged at the end on one side Da in the axial direction of the flange section 672 and is in circumferential contact with a second contact section 712 of the disc hub 71 described later. Details of the first contact section 673 will be explained later.

[0032] In the present embodiment, the material of the annular gear 67 is a resin. This allows the annular gear 67 to be made lighter compared to a gear 67 made of metal, and it also facilitates elastic deformation of the first contact section 673 in the circumferential direction. Therefore, even if there are points in the circumferential direction where the first contact section 673 and the second contact section 712 are not in contact due to tolerances of the first contact section 673 and the second contact section 712 when no torque is applied, the deformation of the first contact section 673 at these points ensures that the two contact sections are in contact when a torque is applied. Consequently, a decrease in the efficiency of transmitting the torque from the annular gear 67 to the disc hub 71 can be prevented.However, the example of the present embodiment does not preclude the possibility that the ring-shaped gear 67 is made of a material other than a resin. <1-7. The Hub 7>

[0033] Next, with reference to Fig. 1 to Fig. 5 explains hub 7. Fig. Figure 4 shows the appearance of the disc hub 71 on the other side Db in the axial direction. Fig. Figure 5 shows the assembly consisting of the ring-shaped gear 67 and the disc hub 71. The hub 7 is rotatable about the central axis CX. As mentioned above, the motor 1 is equipped with the hub 7. The rotation of the rotor 3 is transmitted to the hub 7 via the shaft 2 and the reduction gear 6. The hub 7 is made of a metal such as aluminum or an alloy thereof, or the like.

[0034] The hub 7 has the disc hub 71 and a hub cylinder 72 in the form of a tube with a bottom.

[0035] The disc hub 71 is connected to the annular gear 67. As mentioned previously, the hub 7 incorporates the disc hub 71. The disc hub 71 has a disc shape that surrounds the central axis CX. The disc hub 71 comprises a disc section 711 and a second contact section 712. The disc section 711 is positioned further than the annular gear 67 on one side Da in the axial direction and extends radially as it surrounds the central axis CX. The second contact section 712 is positioned on the other side Db in the axial direction of the disc section 711 and can make contact with the first contact section 713 in the circumferential direction. For example, when the ring-shaped gear 67 rotates in one direction, one end in the circumferential direction of the second contact section 712 is in contact with the other end in the circumferential direction of the first contact section 673.When no torque acts on the annular gear 67, the second contact section 712 can be in circumferential contact with the first contact section 673, but this contact is not required. The rotation of the annular gear 67 can be transmitted to the disc hub 71 by bringing the first contact section 673 of the annular gear 67 into circumferential contact with the second contact section 712 of the disc hub 71. Consequently, the rotation from the rotor 6 can be transmitted to the hub 7 via the shaft 2 and the reduction device 6 even without establishing a section that couples the annular gear 67 of the reduction device 6 and the disc hub 71 in the axial direction. Therefore, the efficiency of the torque transmission from the reduction device 6 to the hub 7 can be improved.Details regarding the second contact section 712 will be explained later.

[0036] The disc hub 71 further comprises a bearing holder 713, a bearing 7131, and coupling sections 714. The bearing holder 713 surrounds the central axis CX and extends in the axial direction. The wheel axle 112 is guided through the bearing holder 713. A bearing 7131 is arranged on the inner side surface in the radial direction of the bearing holder 713. The bearing holder 713 rotatably holds the wheel axle 112 via the bearing 7131.

[0037] The coupling sections 714 are arranged at the outer end in the radial direction of the disk section 711 and are coupled to the hub cylinder 72 in the axial direction. In the present embodiment, the multiple coupling sections 714 are arranged along the outer end in the radial direction of the disk section 711 in the circumferential direction.

[0038] The hub cylinder 72 surrounds the annular gear 67 and the second contact section 712 and extends in the axial direction. As mentioned above, the hub 7 incorporates the hub cylinder 72. The end on one side Da in the axial direction is coupled to the outer end in the radial direction of the disc section 711. That is, the end on one side Da in the axial direction of the hub cylinder 72 is covered by the disc hub 71. The hub cylinder 72 houses the rotor 3, the stator 4, the stator holder 5, and the reduction gear 6.

[0039] The hub cylinder 72 has a tube section 721, flange sections 7221, 7222, a base plate 724, a bearing holder 725 and a bearing 7251.

[0040] The tube section 721 has a tubular shape that surrounds the rotor 3, the stator 4, the stator holder 5, and the reduction device 6, and extends in the axial direction. The end on one side Da in the axial direction of the tube section 721 is coupled to the coupling sections 714. This couples the end region on one side Da in the axial direction of the hub cylinder 72 to the disc hub 71.

[0041] The flange sections 7221 and 7222 are arranged on the outer side surfaces in the radial direction of the tube section 721 and extend circumferentially, extending radially outwards from the tube section 72. In the present embodiment, the flange sections 7221 and 7222 have a ring shape that surrounds the tube section 721. Flange section 7221 is arranged on one side Da in the axial direction of the tube section 721. Flange section 7222 is arranged on the other side Db in the axial direction of the tube section 721.

[0042] At the inner end in the radial direction of the hub cylinder 72 (more precisely, the tube section 721), ribs 723 project radially inward and extend circumferentially. As mentioned previously, the hub cylinder 72 has these ribs 723. The ribs 723 are positioned further along the axis than the annular gear 67 on the other side Db and, viewed from the axis, overlap the outer end in the radial direction of the annular gear 67 (in particular, the tube section 671). In other words, the inner end of the ribs 723 is located radially further inward than the outer end of the annular gear 67 (in particular, the tube section 671). In this way, the ribs 723 prevent movement of the annular gear 67 to the other side Db in the axial direction.

[0043] In the present embodiment, as in Fig. Figure 3 shows several ribs 723 arranged side by side with gaps along the circumferential direction. This ensures that, during the assembly of the motor 1, the ribs 723 do not obstruct the attachment of elements located further along the circumferential direction than the ribs 723 on the other side Db. For example, when attaching the reduction device 6 after the hub cylinder 725 has been attached to the motor 1, the planetary gear 65 can be guided through the aforementioned gaps so that it does not collide with the ribs 723. However, the example described above does not preclude a configuration with only a single rib 723, a configuration with no gaps between several ribs 723 in the circumferential direction, and the like. The ribs 723 can also be ring-shaped, surrounding the central axis CX.

[0044] The base plate 724 extends radially inwards from the end on the other side Db of the tube section 721 in the axial direction. The base plate 724 has the shape of a round plate that surrounds the wheel axle 113 and is positioned further in the axial direction than the stator holder 5 on the other side Db.

[0045] The bearing holder 725 has a tubular shape that extends radially from its inner end to the base plate 724 and axially. The wheel axle 113 is guided through the bearing holder 725. Furthermore, the bearing 7251 is arranged on the inner side surface of the bearing holder 725 in the radial direction. The bearing holder 725 rotatably holds the bearing axle 113 via the bearing 7251.

[0046] In the present embodiment, the tube section 721, the flange sections 7221, 7222, the ribs 723, the base plate 724, and the bearing holder 725 are formed in one piece. However, this example is not limited; at least one of these elements can also be formed separately from another element. <1-8. The first contact section 673 and the second contact section 712>

[0047] Next, with reference to Fig. 1 and Fig. 3 to Fig. 6. Details of the first contact section 673 and the second contact section 712 are explained. Fig. Figure 6 is a view showing the contact setup of the first contact section 673 and the second contact section 712. Fig. Figure 6 is a view of the contact structure of the two sections, seen from the outside in the radial direction towards the inside in the radial direction, and corresponds to the area VI surrounded by a dashed line in Figure 6. Fig. 5.

[0048] In the present embodiment, the first contact section 673 on the annular gear 67 has several first recesses 6731 and several first projections 6732. The first recesses 6731 and the first projections 6732 are arranged on the end face on one side Da in the axial direction of the flange section 672. The first recesses 6731 extend axially towards the other side Db and in the radial direction. In other words, the first recesses 6731 are spaces arranged between circumferentially adjacent first projections 6732. The first projections 6732 project axially towards one side Da and extend in the radial direction. In other words, the first projections 6732 are parts of the flange section 672 arranged between circumferentially adjacent first recesses 6731.

[0049] In the present embodiment, the second contact section 712 on the disk hub 71 has several second recesses 7121 and several second projections 7122. The second recesses 7121 and the second projections 7122 are arranged in a region on the radially outer side of the end face of the disk section 711 on the other side Db in the axial direction. The second recesses 7121 are recessed towards one side Da in the axial direction and extend in the radial direction. In other words, the second recesses 7121 are spaces arranged between second projections 7122 that are adjacent in the circumferential direction. The second projections 7122 project towards the other side Db in the axial direction and extend in the radial direction.

[0050] The first projections 6732 are arranged inside the second recesses 7121, in other words, between circumferentially adjacent second projections 7122. When the annular gear 67 rotates to one side circumferentially, an end surface in the circumferential direction of the first projections 6732 comes into contact with the inner surface of the second recesses 7121 facing the other side circumferentially, in other words, with the other end surface in the circumferential direction of the second projections 7122.

[0051] The second projections 7122 are arranged inside the first recesses 6731, in other words, between circumferentially adjacent first projections 6732. When the annular gear 67 rotates to one side circumferentially, an end surface in the circumferential direction of the second projections 7122 comes into contact with the inner surface of the first recesses 6731 facing the other side circumferentially, in other words, with the other end surface in the circumferential direction of the first projections 6732.

[0052] An adhesive 83 can be applied between the first projections 6732 and the second recesses 7121 or the second projections 7122 (in other words, between the first recesses 6731 or the first projections 6732 and the second projections 7122). That is, an adhesive 83 can be applied between the first contact section 673 and the second contact section 712. In this way, the adhesive 83 can create a strong bond between the first contact section 673 and the second contact section 712. Consequently, the annular gear 67 can be even more firmly connected to the disc hub 71. Therefore, the efficiency of transmitting the torque from the annular gear 67 to the disc hub 71 can be further improved. However, this example does not preclude a configuration in which no adhesive 83 is applied between the first contact section 673 and the second contact section 712.

[0053] The example of the present embodiment does not exclude a configuration in which at least one of the first projections 6732 and the first recesses 6731 is present only singly, a configuration in which the first contact section 673 has only one of the first projections 6732 and the first recesses 6731, and the like. Furthermore, the example of the present embodiment does not exclude a configuration in which at least one of the second projections 7122 and the second recesses 7121 is present only singly, a configuration in which the second contact section 712 has only one of the second projections 7122 and the second recesses 7122, and the like.

[0054] In the following, one of the first recesses 6731 and the second recesses 7121 may be designated as "recess 81". The one consisting of the first projections 6732 and the second projections 7122, which is arranged inside recess 81, may be designated as "projection 82".

[0055] In the connection area of ​​the disc hub 71 and the annular gear 67, one of the first contact sections 673 and the second contact section 712 has a recess 81 that is sunken in the axial direction. If said one is the first contact section 673, the recess 81 is the first recess 6731, and if said one is the second contact section 712, it is the second recess 7121. The other of the first contact section 673 and the second contact section 712 has a projection 82. The projection 82 projects in the axial direction and is located inside the recess 81. If said other is the second contact section 712, the projection 82 is the second projection 7122, and if said other is the first contact section, it is the first projection 6732.Due to the interlocking of the recess 81 and the projection 82, the inner side surface of the recess 81, facing circumferentially on one side, comes into contact with the other end surface of the projection 82, also facing circumferentially, when the annular gear 67 rotates. This allows the rotation of the annular gear 67, directed circumferentially on one side, to be transmitted to the disc hub 71.

[0056] Preferably, the smallest width in the circumferential direction of the recess 81 is wider than the largest width in the circumferential direction of the projection 82. For example, the smallest width W1a in the circumferential direction of the first recesses 6731 is wider than the largest width W2b in the circumferential direction of the second projections 7122. Furthermore, the smallest width W2a in the circumferential direction of the second recesses 7121 is wider than the largest width W1b in the circumferential direction of the first projections 6732. In this way, inserting the projection 82 into the recess 81 is easier compared to a design where the largest width in the circumferential direction of the projection 82 is equal to or wider than the smallest width in the circumferential direction of the recess 81. Consequently, the disc hub 71 can be more easily attached to the annular gear 67. Additionally, the projection 82 can be smoothly inserted into the recess 81.For example, the risk of the projection 82 getting stuck on the inner side surface of the recess 81 can be prevented. Or, friction between the circumferentially facing inner side surfaces of the recess 81 and the circumferential end surfaces of the projection 82 can be prevented. Consequently, wear of the recess 81 and the projection 82 during fitting can be prevented.

[0057] Preferably, when the annular gear 67 is rotated to one side in the circumferential direction, at least at a first recess 6731 the entire area of ​​the inner side surface facing one side in the circumferential direction of the first recess 6731 is in contact with the end surface on the other side in the circumferential direction of a second projection 7122. Furthermore, at at least at a first projection 6732 the entire area of ​​an end surface in the circumferential direction of the first projection 6732 is in contact with the inner side surface (or the end surface on the other side in the circumferential direction of a second projection 7122) facing the other side in the circumferential direction.This means that, in at least one first contact section 673, the entire area of ​​the circumferential end surface facing the second contact section 712 is in contact with the second contact section 712 in the circumferential direction of the first contact section 673. If the contact surface of the first contact section 673 with the second contact section 712 is made wider, the efficiency of transmitting the torque from the annular gear 67 to the disc hub 71 can be improved. However, this example does not preclude a design in which, in all first contact sections 673, the entire area of ​​the circumferential end surface facing the second contact section 712 is not in contact with the second contact section 712 in the circumferential direction of the first contact section 673.

[0058] Preferably, the inner side surface of the second recesses 7121 facing one side in the circumferential direction is wider than the end surface on the other side in the circumferential direction of the first projections 6732. Furthermore, an end surface in the circumferential direction of the second projections 7122 is wider than the inner side surface of the first recesses 6731 facing the other side in the circumferential direction (or the end surface on the other side in the circumferential direction of the first projections 6732). That is, the end surface in the circumferential direction of the second contact section 712 on the side of the first contact section 673 is larger than the end surface in the circumferential direction of the first contact section 673 on the side of the second contact section 712.For example, the width d2a, d2b in the radial direction of the second recesses 7121 or the second projections 7122 can be wider than the width d1 in the radial direction of the first recesses 6731 or the first projections 6732. Furthermore, the width h2 in the axial direction of the second recesses 7121 or the second projections 7122 can be wider than the width h1 in the axial direction of the first recesses 6731 or the first projections 6732. In this way, the area dimension of the end face in the aforementioned circumferential direction of the second contact section 712 of the disc hub 7 can be larger than the contact area in the contact region between the first contact section 673 and the second contact section 712. This allows at least one of the widths d2a, d2b in the radial direction and the width in the axial direction h2 of the said end surface in the circumferential direction of the second contact section 712 to be larger than the contact area mentioned above.Consequently, even if there are errors in the dimensions and position of the second contact section 712, a reduction in the aforementioned contact area can be prevented. This prevents a decrease in the efficiency of transmitting the torque from the annular gear 67 to the disc hub 7. However, the example described above does not preclude a configuration in which the area dimension of the end surface in the circumferential direction of the second contact section 712 on the side of the first contact section 673 is equal to or smaller than the area dimension of the end surface in the circumferential direction of the first contact section 673 on the side of the second contact section 712.

[0059] One of the first recesses 6731 and the second projections 7122 is arranged at equal intervals in the circumferential direction. Preferably, both the first recesses 6731 and the second projections 7122 are arranged at equal intervals in the circumferential direction. In other words, one of the first projections 6732 and the second recesses 7121 is arranged at equal intervals in the circumferential direction. Preferably, both the first projections 6732 and the second recesses 7121 are arranged at equal intervals in the circumferential direction. That is to say, with regard to the first contact section 673 and the second contact section 712, several of at least one of them are arranged at equal intervals in the circumferential direction.In this way, an imbalance in the torque acting between the annular gear 67 and the disc hub 7 in the circumferential direction can be suppressed or prevented during the rotation of the annular gear 67. However, the example described above does not preclude a design in which both the multiple first contact sections 673 and the multiple second contact sections 712 are not arranged at equal intervals in the circumferential direction.

[0060] In the present embodiment, the first projections 6732 have a first recessed area 6733. This first recessed area 6733 is provided both between the end surface on one side Da in the axial direction and an end surface in the circumferential direction, and also between the end surface on one side Da in the axial direction and the other end surface in the circumferential direction at the front end of the first projection 6732. Alternatively, this first recessed area 6733 can also be provided only between the end surface on one side Da in the axial direction and an end surface in the circumferential direction, or between the end surface on one side Da in the axial direction and the other end surface in the circumferential direction.The first recess area 6733 is an area in which a curved surface or a flat surface is provided between the end face of the first projection 6732 on one side Da in the axial direction and the end face in the circumferential direction. For example, the first recess area 6733 can be an area that has undergone a so-called R-chamfer (a round chamfer) or an area that has undergone a so-called C-chamfer (edge ​​chamfer). In an R-chamfer, a curved surface is provided between the end face on one side Da in the axial direction and the end face in the circumferential direction. This curved surface projects from the radial direction to one side Da in the axial direction and to the circumferential direction and extends in the radial direction.In a C-bevel, a cut at an oblique angle is made between the end surface on one side Da in the axial direction and the end surface in the circumferential direction, creating a flat surface that obliquely crosses the axial direction and runs in the radial direction.

[0061] The second projections 7122 have a second recessed area 7123. This second recessed area 7123 is located both between the end surface on the other side Db in the axial direction and an end surface in the circumferential direction, and also between the end surface on the other side Db in the axial direction and the other end surface in the circumferential direction at the front end of the second projection 7122. Alternatively, this second recessed area 7123 can also be located only between the end surface on the other side Db in the axial direction and an end surface in the circumferential direction, or between the end surface on the other side Db in the axial direction and the other end surface in the circumferential direction. The second recessed area 7123 is a region in which a curved surface or a flat surface is located between the end surface of the second projection 7122 on the other side Db in the axial direction and the end surface in the circumferential direction.For example, the second recess area 7123 can be an area that has undergone a so-called R-chamfer (a round chamfer) or an area that has undergone a so-called C-chamfer (edge). With an R-chamfer, a curved surface is created between the end surface on the other side Db in the axial direction and the end surface in the circumferential direction. This curved surface projects from the radial direction to the other side Db in the axial direction and to the circumferential direction, extending radially. With a C-chamfer, a cut at an oblique angle is made between the end surface on the other side Db in the axial direction and the end surface in the circumferential direction, creating a flat surface that obliquely intersects the axial direction and extends radially.

[0062] Below, at least one of the first recess area 6733 and the second recess area 7123 can be designated as "recess area 84".

[0063] There is no restriction to the above example, and at least one of the first recess area 6733 and the second recess area 7123 can be omitted. That is, at least one of the first contact section 673 and the second contact section 712 can have the recess area 84 provided between the end surface in the axial direction and the end surface in the circumferential direction. For example, the recess area 84 is provided at the front end of the projection 82 between the end surface in the axial direction and the end surface in the circumferential direction.When the first contact section 673 and the second contact section 712 are brought into contact by moving at least one of them in the axial direction, the recess area 84 prevents a corner between the end face in the axial direction and the end face in the circumferential direction from colliding with the other element, thus allowing both to be easily brought into contact. For example, when the recess 81 and the projection 82 are joined, the projection 82 can be easily positioned inside the recess 81 by the aforementioned recess area at the tip end of the projection 82. Or, as will be described below, when the first contact section 673 and the second contact section 712 are bonded with the adhesive 83 in the recess area 84, a space can be formed in which the adhesive 83 accumulates.This makes it difficult, for example, for the adhesive 83 to escape from the area between the two elements.

[0064] Preferably, in the second projection 7122 (or the second recess 7121), the width d2b in the radial direction of the region on the other side Db in the axial direction is narrower than the width d2a in the radial direction of the region on one side Da in the axial direction. That is, the width d2b in the radial direction of the region of the second contact section 712 on the other side Db in the axial direction is narrower than the width d2a in the radial direction of the region of the second contact section 712 on one side Da in the axial direction. In this way, the width d2b in the radial direction of the second contact section 712 on the side of the annular gear 67 becomes narrower than its width d2a in the radial direction on the side of the disc hub 711. Therefore, it becomes easy to arrange the second contact section 712 inside the hub cylinder 72 (that is, the tube section 721).Consequently, the coupling of the hub cylinder 72 with the disc hub 71 can be easily carried out. However, this example does not preclude a setup in which the width d2b in the radial direction of the second contact section 712 on the side of the annular gear 67 is equal to or greater than its width d2a in the radial direction on the side of the disc hub 711.

[0065] In the present embodiment, at least one first projection 6732 has an end on one side Da in the axial direction contacting the bottom surface of the second recess 7121 facing the other side Db in the axial direction. However, this is not the only example; at least one second projection 7122 can also have an end on the other side Db in the axial direction contacting the bottom surface of the first recess 6731 facing the other side Da in the axial direction. That is, the end in the axial direction of one of the elements formed by the first contact section 673 and the second contact section 712 is in axial contact with that element of the annular gear 67 and the disc hub 71 which the other element formed by the first contact section 673 and the second contact section 712 has.Due to the axial contact described above, the axial position of one of the ring-shaped gear 67 and the disc hub 71 relative to the other can be easily determined. However, the example described above does not preclude a configuration in which, for all first contact sections 673, the first contact section 673 does not touch the disc hub 71 in the axial direction, nor a configuration in which, for all second contact sections 712, the second contact section 712 does not touch the ring-shaped gear 67 in the axial direction.And the example described above does not exclude a structure in which, for at least one first projection 6732, the end of the first projection 6732 on one side Da in the axial direction touches the bottom surface of the second recess 7121 facing the other side Db in the axial direction, and in the case of at least one second projection 7122, the end of the second projection 7122 on the other side Db in the axial direction touches the bottom surface of the first recess 6731 facing the one side Da in the axial direction. <1. The vehicle 100>

[0066] In the present embodiment, the motor 1 is a so-called hub motor, which is installed in a vehicle 100. Fig. Figure 7 is a schematic view of vehicle 100, into which engine 1 is installed. Vehicle 100 of Fig. 4 is an electric bicycle. However, the example of the present embodiment does not exclude a setup in which the motor 1 is installed in a vehicle 100 other than an electric bicycle.

[0067] As in Fig. As shown in Figure 7, the vehicle 100 has the motor 1. In the vehicle 100, the rotation of the rotor 3 can also be transmitted from the reduction device 6 to the hub 7 without setting up a coupling section that couples the ring-shaped gear 67 of the reduction device 6 and the disc hub 7 in the axial direction, as described later.

[0068] The vehicle 100 also has a frame 110, a front wheel 120, a rear wheel 130, a handlebar 140 and a battery 150.

[0069] The frame 110 has a fork 111 and wheel axles 112, 113 of the front wheel 120. The fork 111 holds the front wheel 120 via the wheel axles 112, 113. One end of the wheel axles 112, 113 is connected to the motor 120 of the front wheel 120. The other end of the wheel axles 112, 113 is fixed to the front end section of the fork 111.

[0070] The front wheel 120 and the handlebar 140 are attached to the front section of the frame 110. The front wheel 120 comprises the motor 1, several spokes 121, a rim 122, and a tire 123. The spokes 121 are arranged circumferentially and hold the rim 122 in relation to the motor 1. The rim 122 is an annular element that surrounds the central axis CX and the motor 1. The inner end, in the radial direction of the spokes 121, is fixed to the motor 1 (more precisely, to the flange sections 7221, 7222). The outer end, in the radial direction of the spokes 121, is fixed to the inner end, in the radial direction of the rim 122. The tire 123 is attached to the outer end, in the radial direction of the rim 122.

[0071] The rear wheel is rotatably mounted in the rear section of the frame 110. The rear wheel 130 rotates due to the force with which the user pedals the pedals 114.

[0072] The battery 150 is attached to the frame 110. The battery 150 is a rechargeable battery that supplies power to the motor 1.

[0073] In vehicle 100, the tire 123 of the front wheel 120 rotates about the central axis CX due to the rotation of the rear wheel 130. The resulting torque about the central axis CX is transmitted to the motor 1 via the rim 122 and the spokes 121. This torque is transmitted via the hub 7, the annular gear 67, the reduction gear 6, and the shaft 2 to the rotor 3, rotating the rotor 3 about the central axis CX. The motor 1 has a sensor (not shown) that detects the rotation of at least one of the shaft 2, the rotor 3, the gears 65, 66, the planet carriers, etc., of the reduction gear 6, the annular gear 67, or the hub 7, and, if necessary, rotates the rotor 3 in one direction or the other circumferentially about the central axis CX. The torque of rotor 3 is added to the torque for the vehicle's movement 100.This means that, if necessary, motor 1 supports the torque required for the vehicle's movement. <3. Other>

[0074] The foregoing described one embodiment of the present invention. However, the scope of the present invention is not limited by the embodiment described above. Various modifications can be added to the described embodiment to the extent that they do not deviate from the content of the invention. The points explained in the embodiment described above can be combined as appropriate, provided that no incompatibility arises. Commercial application area

[0075] The present invention is useful, for example, for a device that transmits the rotation of a rotor to a rotatable element. Explanation of reference symbols

[0076] 1 Motor; 2 Shaft; 3 Rotor; 31 One-way coupling; 32 Rotor core; 33 Magnet; 4 Stator; 41 Stator core; 42 Insulator; 43 Coil section; 5 Stator holder; 51 Bearing holder; 511 Bearing; 52 Bracket; 521 Holding section; 53 Holder section; 54 Circuit board; 6 Reduction device; 61 Base; 611 Bearing holder; 6111 Bearing; 612 Base plate section; 613 Base tube section; 62 Sun gear; 63 Planetary shaft; 64 Planetary carrier; 65 Planetary gear; 66 Pinion; 67 Ring gear; 671 Tube section; 672 Flange section; 673 First contact section; 6731 First recess; 6732 First projection; 6733 First recess area; 7 Hub; 71 Disc hub; 711 Disc section; 712 Second contact section; 7121 Second recess; 7122 Second projection; 7123 Second recess area; 713 Bearing holder; 7131 Bearing; 714 Coupling section; 72 Hub cylinder; 721 Tube section; 7221, 7222 Flange section; 723 Rib; 724 Base plate; 725 Bearing holder; 7251 Bearing; 81 Recess; 82 Projection; 83 Adhesive;84 Recess area; 100 Vehicle; 110 Frame; 111 Fork; 112, 113 Wheel axle; 114 Pedals; 120 Front wheel; 121 Spoke; 122 Rim; 123 Tire; 130 Rear wheel; 140 Handlebar; 150 Battery; CX Center axle; Da one side in the direction of the axle; Db other side in the direction of the axle.;

Claims

[1] Motor (1), comprising a wave (2) extending along a central axis (CX) running in one axial direction; a rotor (3) which, together with the shaft (2), is rotatable about the central axis (CX); a stator (4) which is opposite the rotor (3) in a radial direction; a reduction device (6) connected to the shaft (2); and a hub (7) which is rotatable about the central axis (CX); wherein the reduction device (6) comprises an annular gear (67) that surrounds the central axis (CX) and is rotatable about the central axis (CX), wherein the ring-shaped gear (67) comprises a first contact section, wherein the hub (7) comprises a disc hub (71) that surrounds the central axis (CX), the disc hub (71) comprises a disc section which is arranged further along the axial direction than the annular gear (67) on one side, surrounds the central axis (CX) and extends radially around the central axis (CX), and a second contact section which is arranged on the other side in the axial direction of the disk section and which can come into contact with the first contact section in the circumferential direction, wherein one of the first contact section and the second contact section comprises a recessed depression in the axial direction, wherein the other comprises a projection extending in the axial direction from the first contact section and the second contact section, which is arranged inside the recess. [2] Motor (1) according to claim 1, wherein the smallest width in the circumferential direction of the recess is wider than the largest width in the circumferential direction of the projection. [3] Motor (1), comprising a wave (2) extending along a central axis (CX) running in one axial direction; a rotor (3) which, together with the shaft (2), is rotatable about the central axis (CX); a stator (4) which is opposite the rotor (3) in a radial direction; a reduction device (6) connected to the shaft (2); and a hub (7) which is rotatable about the central axis (CX); wherein the reduction device (6) comprises an annular gear (67) that surrounds the central axis (CX) and is rotatable about the central axis (CX), wherein the ring-shaped gear (67) comprises a first contact section, wherein the hub (7) comprises a disc hub (71) that surrounds the central axis (CX), the disc hub (71) comprises a disc section which is arranged further along the axial direction than the annular gear (67) on one side, surrounds the central axis (CX) and extends radially around the central axis (CX), and a second contact section which is arranged on the other side in the axial direction of the disk section and which can come into contact with the first contact section in the circumferential direction, wherein several of at least one from the first contact section and the second contact section are arranged at equal intervals in the circumferential direction. [4] Motor (1), comprising a wave (2) extending along a central axis (CX) running in one axial direction; a rotor (3) which, together with the shaft (2), is rotatable about the central axis (CX); a stator (4) which is opposite the rotor (3) in a radial direction; a reduction device (6) connected to the shaft (2); and a hub (7) which is rotatable about the central axis (CX); wherein the reduction device (6) comprises an annular gear (67) that surrounds the central axis (CX) and is rotatable about the central axis (CX), wherein the ring-shaped gear (67) comprises a first contact section, wherein the hub (7) comprises a disc hub (71) that surrounds the central axis (CX), the disc hub (71) comprises a disc section which is arranged further along the axial direction than the annular gear (67) on one side, surrounds the central axis (CX) and extends radially around the central axis (CX), and a second contact section, which is arranged on the other side in the axial direction of the disc section and can come into contact with the first contact section in the circumferential direction, wherein the hub (7) further comprises a hub cylinder which surrounds the annular gear (67) and the second contact section and extends in the axial direction, wherein the end region is coupled on one side in the axial direction of the hub cylinder to the outer end in the radial direction of the disc hub (71), and the width in the radial direction of the area on the other side in the axial direction of the second contact section is narrower than the width in the radial direction of the area on one side in the axial direction of the second contact section, wherein the hub cylinder comprises a rib on the inner end face in the radial direction of the hub cylinder, which projects inwards in the radial direction and extends in the circumferential direction, wherein the rib is arranged further than the annular gear (67) on the other side in the axial direction and, viewed from the axial direction, overlaps the outer end in the radial direction of the annular gear (67). [5] Motor (1), comprising a wave (2) extending along a central axis (CX) running in one axial direction; a rotor (3) which, together with the shaft (2), is rotatable about the central axis (CX); a stator (4) which is opposite the rotor (3) in a radial direction; a reduction device (6) connected to the shaft (2); and a hub (7) which is rotatable about the central axis (CX); wherein the reduction device (6) comprises an annular gear (67) that surrounds the central axis (CX) and is rotatable about the central axis (CX), wherein the ring-shaped gear (67) comprises a first contact section, wherein the hub (7) comprises a disc hub (71) that surrounds the central axis (CX), the disc hub (71) comprises a disc section which is arranged further along the axial direction than the annular gear (67) on one side, surrounds the central axis (CX) and extends radially around the central axis (CX), and a second contact section, which is arranged on the other side in the axial direction of the disc section and can come into contact with the first contact section in the circumferential direction, wherein an adhesive is filled between the first contact section and the second contact section. [6] Motor (1) according to any one of claims 1 to 5, wherein at least one of the first contact section and the second contact section comprises a recess area which is provided between an end surface in the axial direction and an end surface in the radial direction. [7] Motor (1) according to one of claims 1 to 6, wherein in at least one first contact section the entire area of ​​the circumferential end surface facing the second contact section is in contact with the second contact section in the circumferential direction of the first contact section. [8] Motor (1) according to any one of claims 1 to 7, wherein the end surface in the circumferential direction of the second contact section on the side of the first contact section is larger than the end surface in the circumferential direction of the first contact section on the side of the second contact section. [9] Motor (1) according to claim 4, wherein several ribs are provided which are arranged at intervals in the circumferential direction. [10] Motor (1) according to one of claims 1 to 9, wherein the end in the axial direction of one of the first contact section and the second contact section is in contact with that element of the annular gear (67) and the disc hub (71) which comprises the other of the first contact section and the second contact section. [11] Motor (1) according to any one of claims 1 to 10, wherein the material of the annular gear (67) is a resin. [12] Vehicle comprising an engine (1) according to any one of claims 1 to 11.

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