TWI847768B - Hub motor - Google Patents

Abstract

A hub motor adapted to be installed on a bicycle, and including a spindle, a stator, a rotor, and a housing is provided. The hub motor is fixed on a frame of the bicycle by the spindle. The housing is rotatably slipped over the spindle, and is adapted to be driven by the rotor to rotate around the rotor and the spindle. The housing has an accommodating space, a first through hole and a second through hole. The spindle includes a first member and a second member along an extending direction, and the first member sleeves on the second member. The first member is passed through the first through hole, and includes a first combination portion and a second combination portion located in the accommodating space. The stator is fixed to the first combination portion, and the second combination portion is connected to the second member. The second member is passed through the second through hole, and includes a supporting portion and a connecting portion located in the accommodating space. The rotor is rotatably sleeved on the supporting portion. The connecting portion is separable sleeved on the second combination portion, and the first member and the second member cannot rotate relative to each other after being sleeved.

Description

Wheel motor

The present invention relates to a motor, in particular a hub motor mounted on a bicycle.

A hub motor is a motor that drives the outer shell to rotate through an internal mechanism. When used on a bicycle, the hub motor is installed on the front wheel or rear wheel of the bicycle, and the outer shell of the hub motor is connected to the front wheel or rear wheel. In this way, the hub motor can serve as an auxiliary power of the bicycle to drive the wheels to rotate, thereby assisting the bicycle rider.

Since the wheel motor housing must rotate relative to the frame, most wheel motors have a non-rotating spindle. Because the spindle not only has to support the weight of the entire bicycle and its rider, but also needs to serve as the rotation axis of the wheel motor housing and other components, it needs to have high accuracy and facilitate the replacement and installation of other parts.

The present invention provides a wheel hub motor, the spindle of which has the advantage of convenient installation, and can increase the accuracy of installation of each component and avoid errors in the components of the wheel hub motor due to wear caused by torque.

To achieve the above advantages, an embodiment of the present invention provides a hub motor suitable for installation on a bicycle. The hub motor includes: a spindle, a rotor, a stator and a housing. The spindle is fixed to the frame of the bicycle and has a first end and a second end opposite to each other along the extension direction. The rotor is sleeved on the spindle and pivots around the spindle. The stator is fixed on the spindle and adjacent to the rotor. The housing is sleeved on the spindle and is driven by the rotor to pivot around the spindle. The housing has a storage space, a first through hole and a second through hole opposite to the first through hole. The storage space accommodates the stator and the rotor. The spindle includes a first component and a second component along the extension direction, the first component is sleeved on the second component; the first component is inserted into the first through hole, and includes a first mounting portion and a second mounting portion located in the accommodating space, the first mounting portion is fixed to the stator, and the second mounting portion is connected to the second component; the second component is inserted into the second through hole, and includes a supporting portion and a connecting portion located in the accommodating space, the rotor is rotatably sleeved on the supporting portion, and the connecting portion is detachably sleeved on the second mounting portion, and after sleeved, the first component and the second component cannot rotate relative to each other.

In one embodiment, the radial outer side surface of the above-mentioned connecting portion is provided with a groove radially concave toward the axis of the axle, and the groove further has a sliding surface.

In one embodiment, the first component includes a mounting section and a sleeve section along the extension direction; the mounting section is close to the first end and is suitable for connecting to the frame; the outer shell is rotatably mounted on the sleeve section; the first mounting portion is arranged on the radial outer side of the sleeve section, and the second mounting portion is arranged on the radial inner side of the sleeve section.

In one embodiment, the sleeve segment includes a disc extending along the radial direction of the central axis, and a support ring surrounding the disc, and the stator is sleeved on the support ring.

In one embodiment, the support ring surrounds a setting space, and the rotor is at least partially set in the setting space.

In one embodiment, the second component includes a protrusion extending in the radial direction, the sleeve section has a protrusion section in the setting space along the extension direction, and the rotor is sleeved between the protrusion section and the protrusion.

In one embodiment, the disk body has a third through hole along the extension direction, and the second component is recessed in the radial direction to form a wiring channel corresponding to the third through hole and extending along the extension direction.

In one embodiment, the mounting section has a flange at one end close to the first end, and the flange is suitable for snapping onto the vehicle frame.

In one embodiment, the first component includes a channel that is recessed in the radial direction and extends along the extension direction, and the channel is suitable for accommodating a power line electrically connected to the stator.

In one embodiment, the above-mentioned channel includes a first section and a second section, the first section is located in the installation section, the second section is located in the sleeve section, and the second section is connected to the interior of the sleeve section and faces the first component.

Based on the above description, the hub motor of the present invention has the advantages of convenient installation and alignment, and can increase the accuracy of installation of each component and avoid errors caused by wear of the components of the hub motor due to torque.

In order to make the above and other purposes, features and advantages of the present invention more clearly understood, the following is a detailed description of the embodiments with the help of the attached drawings.

1: Wheel motor

2: Axis

2A: First end

2B: Second end

21: First part

21A: First installation part

21B: Second installation part

211: Installation section

211a: flange

212: Sleeve section

212A: First support section

2121:Support flange

212B: Second support segment

2122: Plate

2122a:Support ring

2122b: Positioning flange

2122c: Gap

2122d: Groove

2123: Third piercing

2124: protruding segment

C: Socket

C1: Sliding surface

2125: Channel

2125a: First paragraph

2125b: Second paragraph

2126a: First channel gap

2126b: Second channel gap

2127: Open channel

22: Second part

22A: Support part

221: Bump

222: Wiring channel

22B: Connection part

223: Groove

23: Opening hole

3: Stator

31: Electromagnetic iron assembly

311: Supporting curved surface

32: Locking plate

33: Control unit

4: Rotor

41: Combination Plate

411: External convex ring

412: Perforation

413: Center gear

414: Support seat

42: Magnet

5: Shell

501: First piercing

502: Second piercing

5A: Body

51: Hole

52: Setting slot

53a, 53b, 53c: rolling bearings

5B: Side cover

5C: Planetary gear set

5D: Ratchet seat

6: Power cord

D1: Extension direction

S1: Storage space

S2: Setting space

A-A: Section

B-B: Section

FIG. 1A is an exploded schematic diagram of a wheel hub motor of an embodiment of the present invention; FIG. 1B is an exploded schematic diagram of the wheel hub motor in FIG. 1A from another perspective; FIG. 2 is a cross-sectional schematic diagram of the wheel hub motor in FIG. 1A; FIG. 3A is a three-dimensional schematic diagram of the central axis of FIG. 1A; FIG. 3B is a schematic diagram of the A-A cross section in FIG. 3A; FIG. 3C is a schematic diagram of the central axis of FIG. 3A from a B-B cross section; FIG. 4 is an exploded schematic diagram of the central axis of FIG. 3A; and FIG. 5 is a three-dimensional schematic diagram of the first component in FIG. 4 from another perspective.

In the following article, the terms used in the description of the embodiments of the present invention, such as "upper", "lower", etc., indicating the orientation or position relationship, are described according to the orientation or position relationship shown in the drawings used. The above terms are only for the convenience of describing the present invention and are not intended to limit the present invention, that is, they do not indicate or imply that the components mentioned must have a specific orientation or be constructed in a specific orientation. In addition, the terms "first", "second", etc. mentioned in this specification or the scope of the patent application are only used to name the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit of the number of elements.

FIG. 1A is an exploded schematic diagram of a hub motor of an embodiment of the present invention. FIG. 1B is an exploded schematic diagram of the hub motor in FIG. 1A from another perspective. FIG. 2 is a cross-sectional schematic diagram of the hub motor in FIG. 1A. As shown in FIG. 1A to FIG. 2, the hub motor 1 provided in this embodiment is suitable for installation on a bicycle (not shown), and includes: a spindle 2, a stator 3, a rotor 4, and a housing 5. The spindle 2 is fixed to a bicycle frame (not shown), and has a first end 2A and a second end 2B opposite to each other along an extension direction D1. The stator 3 is fixed to the spindle 2 and is adjacent to the rotor 4. The rotor 4 is rotatably mounted on the spindle 2 and pivots around the spindle 2. The housing 5 is rotatably mounted on the spindle 2 and is adapted to be driven by the rotor 4 to rotate around the rotor 4 and the spindle 2. The housing 5 has a receiving space S1, a first through hole 501, and a second through hole 502 along the extension direction D1 relative to the first through hole 501. The receiving space S1 accommodates the stator 3 and the rotor 4.

As shown in Figures 1A to 2, in this embodiment, the spindle 2 includes a first component 21 and a second component 22 along the extension direction D1, and the first component 21 is sleeved on the second component 22; the first component 21 is inserted into the first through hole 501, and includes a first mounting portion 21A and a second mounting portion 21B located in the accommodating space S1, the first mounting portion 21A is fixed to the stator 3, and the second mounting portion 21B is connected to the second component 22; the second component 22 is inserted into the second through hole 502, and includes a supporting portion 22A and a connecting portion 22B located in the accommodating space S1, the rotor 4 is rotatably sleeved on the supporting portion 22A, and the second mounting portion 21B is sleeved on the connecting portion 22B, and can slide along the extension direction D1 but cannot rotate along the circumferential direction of the spindle 2. For a detailed description of axis 2, please refer to the following description.

In this embodiment, the hub motor 1 is installed on the rear wheel of the bicycle, the spindle 2 is fixed on the frame of the bicycle, and the housing 5 is indirectly connected to the rim of the rear wheel of the bicycle through multiple spokes connected to multiple holes 51 on the housing 5, so as to drive the rear wheel to rotate when rotating. The installation position of the hub motor 1 is not limited to the rear wheel.

As shown in FIG. 1A to FIG. 2 , in this embodiment, the housing 5 includes, for example, a body 5A, a side cover 5B, and a planetary gear set 5C. The interior of the body 5A forms a receiving space S1, and a hole 51 is located on the outer surface of the body 5A. The side cover 5B is used to cover an opening (not numbered because it has been covered) on one side of the body 5A to protect components such as the spindle 2, the stator 3, the rotor 4, and the planetary gear set 5C. The body 5A and the side cover 5B are respectively provided with a first through hole 501 and a second through hole 502 on the axis corresponding to the spindle 2. A setting groove 52 is formed around the first through hole 501, and the setting groove 52 is located in the receiving space S1 to accommodate a rolling bearing 53a. The outer shell 5 is rotatably mounted on the central shaft 2 through a rolling bearing 53a (the detailed position will be described later). The rolling bearing 53a is, for example, a radial bearing, but the type of the rolling bearing 53a is not limited to this.

As shown in FIG. 1A to FIG. 2 , in this embodiment, the stator 3 is, for example, a circular ring mounted on the spindle 2, including a ring-shaped electromagnetic iron component 31 and a ring-shaped clamping plate 32. The clamping plate 32 is, for example, a surface adjacent to the electromagnetic iron component 31 facing the first end 2A, and is used to match the electromagnetic iron component 31 to position the stator 3 on the spindle 2 (details will be described later), and the inner wall surface of the electromagnetic iron component 31 forms a supporting arc surface 311 for surface contact with the spindle 2.

In this embodiment, the stator 3 controls the electromagnetic iron component 31 installed on the stator 3 through the control unit 33. The control unit 33 is connected to the electromagnetic iron component 31 through the clamping plate 32 and is located in the accommodation space S1, but it is not limited to this. Specifically, in other embodiments, the control unit 33 is installed at other locations on the bicycle (such as a controller on the handlebar), and is electrically connected to the electromagnetic iron component 31 in the accommodation space S1 through the power cord 6 and is located outside the accommodation space S1. The electromagnetic iron component 31 generates a magnetic field by the current provided by the power cord 6, so that the rotor 4 including the magnet 42 rotates relative to the stator 3. The detailed design of the stator 3 can be changed according to needs and is not limited to the above example.

As shown in FIG. 1A to FIG. 2 , in this embodiment, the rotor 4 is, for example, a circular disc body sleeved on the spindle 2, including a composite disc 41 and a plurality of magnets 42. The diameter of the composite disc 41 is, for example, greater than the diameter of the stator 3 and surrounds the stator 3 during assembly, but is not limited thereto. The outer periphery of the composite disc 41 is provided with an outer convex ring 411 extending toward the stator 3 along the extension direction D1, and a plurality of magnets 42 are annularly arranged on the radial inner side surface of the outer convex ring 411. A through hole 412 is provided at the center of the composite disc 41. The spindle 2 is provided with the center of the composite disc 41 through the through hole 412 and serves as the rotation axis of the rotor 4. The rotor 4 is also provided with a center gear 413 on one side of the assembly disc 41 facing the second end 2B for engaging with the planetary gear set 5C. The center gear 413 is also rotatably sleeved on the spindle 2 and rotates with the assembly disc 41 around the spindle 2 as the axis.

As shown in FIG. 1A and FIG. 2 , in this embodiment, the rotor 4 is provided with a support seat 414 surrounding the through hole 412. The support seat 414 is, for example, gradually extended along the extension direction D1 toward the stator 3. Two rolling bearings 53b are sleeved on the inner diameter surface of the support seat 414. The two rolling bearings 53b are arranged along the extension direction D1. With the above structure, the rotor 4 is supported on the spindle 2 through two rolling bearings 53b arranged along the extension direction D1, which can ensure that when the rotor 4 rotates, each magnet 42 can remain perpendicular to the spindle 2 and rotate parallel to the electromagnetic iron assembly 31 of the stator 3.

When the rotor 4 rotates, the rotor 4 drives the planetary gear set 5C through the central gear 413 to drive the outer shell 5 to rotate. During the rotation of the rotor 4, for example, the control unit 33 controls the current supplied to the electromagnetic iron component 31 to control the magnetic field strength generated by the electromagnetic iron component 31 of the stator 3 to change the rotation speed of the rotor 4 and the outer shell 5. The size relationship between the stator 3 and the rotor 4 or the detailed component design can be changed according to needs.

As shown in FIG. 1A to FIG. 2 , in this embodiment, the outer housing 5 further includes a ratchet seat 5D on the side cover 5B. The ratchet seat 5D extends from the second through hole 502 to the outside of the accommodating space S1, and includes an inner cylinder and an outer cylinder. The inner cylinder is fixed to the outer housing 5 and is rotatably sleeved on the spindle 2 through a rolling bearing 53c. The outer cylinder is used to connect with the gear plate (not shown) of the bicycle, and an inner ratchet structure (not shown) is also provided between the inner cylinder and the outer cylinder. The inner ratchet structure is suitable for making the outer cylinder drive the inner cylinder to rotate only in the actuating direction, and cannot drive the inner cylinder to rotate when rotating in the direction opposite to the actuating direction. Thus, when the user steps on the pedal, the chain of the bicycle (not shown) can drive the gear wheel and then drive the ratchet seat 5D and the outer shell 5 to rotate.

FIG3A is a three-dimensional schematic diagram of the central axis of FIG1A. FIG3B is a schematic diagram of the A-A section in FIG3A. FIG3C is a schematic diagram of the central axis of FIG3A in the B-B section. FIG4 is a schematic diagram of the exploded central axis of FIG3A. FIG5 is a three-dimensional schematic diagram of another viewing angle of the first component in FIG4. In FIG3A, the A-A section passes through the axis of the central axis 2 and is perpendicular to the channel 2125. The B-B section passes through the axis of the central axis 2 and is perpendicular to the surface of the routing channel 222.

Please refer to Figures 1A, 2, 3A and 4. As described above, in this embodiment, the central axis 2 includes a first component 21 and a second component 22. The first component 21 is, for example, a seat that gradually expands from the first end 2A toward the second end 2B in a step-like manner along the extension direction D1 (see Figure 4). Its material is, for example, plastic, but it can be changed according to needs. The second component 22 is, for example, a rod extending along the extension direction D1 (see Figure 4). Its material is, for example, metal, but it can be changed according to needs. As shown in Figure 2, in this embodiment, the first component 21 and the second component 22, for example, both have an opening 23 that passes through the axis of the central axis 2. In other words, the central axis 2 can be a hollow bearing with a cavity inside, but it is not limited to this.

As shown in Figures 2 to 3B, in this embodiment, the first component 21 includes, for example, a mounting section 211 and a sleeve section 212 in sequence from the first end 2A to the second end 2B along the extension direction D1. The outer diameter of the mounting section 211 is, for example, smaller than the outer diameter of the sleeve section 212. The mounting section 211 is close to the first end 2A, suitable for connecting to the frame during assembly and protruding outside the outer shell 5 (see Figure 2). As shown in Figure 3A, the mounting section 211 has, for example, a flange 211a at one end close to the first end 2A, and the flange 211a is suitable for clamping to the frame so that the spindle 2 cannot rotate relative to the frame. The shape of the flange 211a is, for example, a cam, but is not limited thereto.

As shown in FIG3B , the sleeve section 212 has a first support section 212A and a second support section 212B on the outer diameter surface along the direction from the first end 2A to the second end 2B. The first support section 212A is close to the first end 2A, and the housing 5 is rotatably mounted on the first support section 212A when assembled. Specifically, please refer to Figures 2 to 3B. When assembled, the first support section 212A is, for example, located at the opening of the first through hole 501 and covers the first through hole 501. The first support section 212A is, for example, formed with a support flange 2121. The support flange 2121 is used to abut against the rolling bearing 53a (see Figure 2) installed on the body 5A along the extension direction D1 to prevent the rolling bearing 53a located at the first through hole 501 of the housing 5 from moving toward the second end 2B.

As shown in Figures 3A to 3C, the second support section 212B is close to the second end 2B of the sleeve section 212, and includes a disc 2122 extending along the radial direction of the spindle 2 and a protruding section 2124 extending toward the second end 2B along the extension direction D1 of the spindle 2. The disc 2122 has a support ring 2122a surrounding the periphery of the disc 2122 and extending toward the second end 2B along the extension direction D1. As shown in Figures 2 and 3B, the end surface of the support ring 2122a along the extension direction D1 toward the second end 2B is, for example, located at one end of the sleeve section 212, but not limited thereto. The first mounting portion 21A is located on the surface of the support ring 2122a (i.e., located on the radial outer side of the sleeve section 212 of the first component 21).

For the first mounting portion 21A, specifically, as shown in FIG. 3A and FIG. 3B, in this embodiment, the support ring 2122a is provided with a positioning flange 2122b protruding along the radial direction on one side close to the first end 2A (i.e., one side of the disc 2122), and a notch 2122c recessed toward the axis of the spindle 2 is provided on one side of the positioning flange 2122b along the radial direction, and a groove 2122d extending along the extension direction is provided on one side of the notch 2122c, but the present invention is not limited thereto.

As shown in FIG. 2 , when the stator 3 is assembled with the spindle 2, the supporting arc surface 311 of the electromagnetic iron component 31 contacts the outer ring surface of the supporting ring 2122a, and the side of the electromagnetic iron component 31 close to the first end 2A abuts the positioning flange 2122b to prevent the electromagnetic iron component 31 from moving toward the first end 2A. The clamping plate 32 connects the side of the electromagnetic iron component 31 close to the first end 2A, and a part of the periphery of the clamping plate 32 enters and abuts the notch 2122c to prevent the electromagnetic iron component 31 from moving toward the second end 2B. The detailed connection method of the stator 3 and the spindle 2 is not limited to this, and can be changed according to needs in other embodiments.

As for the second mounting portion 21B, please refer to FIG. 3A to FIG. 5. The first component 21 is formed with a sleeve C as the second mounting portion 21B on the inner wall surface near the second end 2B (i.e., the radial inner side surface of the sleeve section 212). The length of the sleeve C along the extension direction D1 is, for example, the length of the corresponding connecting portion 22B and extends from the inside of the first supporting section 212A to the protruding section 2124 of the second supporting section 212B. As shown in FIG. 5, a sliding surface C1 facing the axis of the spindle 2 is formed on the inner wall surface of a part of the sleeve C. The sliding surface C1 is used to slide with the groove 223 on the second component 22 and can prevent the second component 22 from rotating relative to the first component 21 with the axis of the spindle 2 as the axis when the second component 22 is sleeved on the second mounting portion 21B of the first component 21. The design of preventing the first component 21 and the second component 22 from rotating relative to each other is not limited to this.

Please refer to Figures 1 to 5. In this embodiment, the first component 21 also includes a channel 2125 that is recessed in the radial direction and extends along the extension direction D1. The channel 2125 is suitable for accommodating the power cord 6 of the wheel hub motor 1 (see Figures 1A and 2). The power cord 6 passes through the channel 2125 from the outside of the wheel hub motor 1 into the accommodating space S1 and is electrically connected to the stator 3. As shown in Figure 2, the length of the channel 2125 is, for example, extending from the mounting section 211 to the protruding section 2124. The width of the channel 2125 is, for example, the same as the outer diameter of the power cord 6. The opening direction of the channel 2125 is, for example, inclined to the gravity direction and opened upward, but is not limited thereto.

Please refer to FIG. 3B . In this embodiment, the channel 2125 includes, for example, a first section 2125a and a second section 2125b. The first section 2125a extends from the mounting section 211 along the extension direction D1 to the portion of the sleeve section 212 close to the first end 2A, and the second section 2125b is located at other portions of the sleeve section 212. As shown in FIG. 3B , the second section 2125b includes a first channel notch 2126a and a second channel notch 2126b. The first channel notch 2126a connects the outer diameter surface and the inner diameter surface of the first support section 212A. The second channel notch 2126b is located between the first channel notch 2126a and the disc 2122. An open channel 2127 penetrating the disc 2122 is formed on the disc 2122, and the position of the open channel 2127 corresponds to the position of the channel 2125.

As can be seen from Figures 3A to 5, the second section 2125b of the channel 2125 is connected to the interior of the sleeve section 212 through the first channel notch 2126a and the second channel notch 2126b. Therefore, when the second component 22 is assembled to the first component 21, as shown in Figure 3B, the second section 2125b of the channel 2125 faces the second component 22, so that a part of the wall surface of the second component 22 (connection portion 22B) can be used as the bottom surface of the channel 2125, but the detailed design of the channel 2125 is not limited to this.

Please refer to FIG. 2 and FIG. 5. In this embodiment, the first component 21, for example, surrounds the opening of the setting space S2 toward the second end 2B through the disc 2122, the support ring 2122a and the protruding section 2124. As shown in FIG. 2, during assembly, the end of the support seat 414 of the rotor 4 close to the first end 2A can be accommodated in the setting space S2, and the end surface of the protruding section 2124, for example, abuts against the rolling bearing 53b (see FIG. 2). In other words, in this embodiment, the first component 21 can assist in positioning the position of the rotor 4 through the protruding section 2124, but the detailed assembly relationship of the setting space S2, the rotor 4 and the protruding section 2124 is not limited to this.

Please refer to FIG. 4 . In this embodiment, the second component 22 includes a connecting portion 22B and a supporting portion 22A in order from the first end 2A to the second end 2B. The connecting portion 22B is formed on a side of the second component 22 close to the first end 2A. The radial outer side surface of the connecting portion 22B is recessed along the radial direction to form a groove 223. The bottom surface of the groove 223 forms a sliding surface corresponding to the sliding surface C1. The connecting portion 22B is completely sleeved on the second mounting portion 21B (sleeved in the sleeve C) when assembled. The supporting portion 22A is suitable for sliding and supporting the rotor 4, the planetary gear set 5C and the ratchet seat 5D (indirectly supported by the rolling bearing 53c), and indirectly supports the side cover 5B through the ratchet seat 5D.

As shown in FIG. 4 , the support portion 22A has a protrusion 221 protruding from the outer surface of the second component 22 in the radial direction near the center of the second component 22. The protrusion 221 is suitable for locating the assembly position of the planetary gear set 5C of the outer housing 5, but is not limited thereto.

As shown in FIG. 2 and FIG. 4 , when assembled, the rotor 4 and the planetary gear set 5C of the housing 5 are sleeved on the support portion 22A and are located between the protruding section 2124 and the convex block 221 (see FIG. 4 ). In other words, the spindle 2 is positioned on the spindle 2 by the protruding section 2124 of the first component 21 and the convex block 221 of the second component 22 from both sides. Therefore, in this embodiment, when the spindle 2 is completely pulled out of the main body 5A of the housing 5 during disassembly, the stator 3, the rotor 4 and the planetary gear set 5C can be pulled out of the accommodating space S1 at the same time, and the rotor 4 and the planetary gear set 5C sleeved on the second component 22 can be removed by separating the first component 21 and the second component 22. In addition, as shown in FIG. 2 , in this embodiment, in the radial direction of the spindle 2, the disc 2122 where the stator 3 is located is also indirectly supported by the connecting portion 22B. However, the detailed assembly structure is not limited to this.

As shown in FIG. 4 , the outer diameter surface of the second component 22 is concave on a side different from the groove 223 to form a wiring channel 222 facing the axial direction away from the eccentric axis 2. The wiring channel 222 extends along the extension direction D1 and, for example, extends to the side of the protrusion 221 close to the second end 2B, but is not limited thereto.

Please refer to FIG. 3C to FIG. 5 , for example, the disk body 2122 further has a third through hole 2123 that passes through the disk body 2122 along the extension direction D1, and the third through hole 2123 includes a position corresponding to the position of the wiring channel 222 at the position of the third through hole 2123, and is adjacent to and connected to the opening channel 2127 that also passes through the disk body 2122, but the present invention is not limited thereto. As shown in FIG. 3C , in this embodiment, a side opening 2123a that opens toward the radial direction of the spindle 2 and away from the spindle 2 is provided on the side of the first support section 212A close to the disk body 2122, and the side opening 2123a corresponds to the position of the third through hole 2123. With the above design, the wire (not shown) entering the accommodation space S1 from the power cord 6 can not only be connected to the stator 3, but also pass through the third through hole 2123 and the wiring channel 222 to extend to the second end 2B, and for example, extend to the ratchet seat 5D, but not limited to this.

Through the channel 2125 and the wiring channel 222, the spindle 2 of this embodiment can be provided with a structure for extending the wire without having a through hole connecting the outer diameter surface and the inner diameter surface of the spindle 2 (see FIG. 2 ) and has better strength. As shown in FIG. 3B , although in this embodiment the first component 21 has a first channel notch 2126a, a second channel notch 2126b and a side opening 2123a in the channel 2125 that connect the outer diameter surface and the inner diameter surface of the spindle 2, the first channel notch 2126a, the second channel notch 2126b and the side opening 2123a will be covered by the second component 22 when the first component 21 and the second component 22 are combined (see FIG. 2 , FIG. 3A and FIG. 3B ). Since the opening 23 of the spindle 2 will not affect the structure of the line extension, in other embodiments of the present invention, the spindle 2 can be a solid shaft.

As described above, the hub motor of the present invention divides the axle into a first part for fixing the stator and a second part for rotatably sleeved by the rotor. The first part and the second part are detachably sleeved on each other, and after being sleeved, the first part and the second part cannot rotate relative to each other. Therefore, it has the advantages of convenient installation and positioning, and can increase the accuracy of installation of each component and avoid errors caused by wear of the components of the hub motor due to torque.

Although the present invention has been disclosed as above by the embodiments, it is not intended to limit the present invention. Those with common knowledge in the technical field to which the present invention belongs may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be subject to the scope of the patent application attached hereto.

2: Axis

2A: First end

2B: Second end

21: First part

21A: First installation part

211a: flange

2121:Support flange

2122: Plate

2122a:Support ring

2122b: Positioning flange

2122c: Gap

2122d: Groove

2125: Channel

22: Second part

222: Wiring channel

22B: Connection part

A-A: Section

B-B: Section

D1: Extension direction

Claims (7)

A hub motor is suitable for being installed on a bicycle. The hub motor comprises: a spindle fixed to a frame of the bicycle and having a first end and a second end opposite to each other along an extension direction; a rotor sleeved on the spindle and pivoted about the spindle; a stator fixed on the spindle and adjacent to the rotor; a housing sleeved on the spindle and driven by the rotor to pivot about the spindle, the housing having a housing for accommodating the spindle. A housing space, a first through-hole and a second through-hole opposite to the first through-hole, the housing space accommodates the stator and the rotor; wherein the spindle includes a first component and a second component along the extension direction, the first component is sleeved with the second component; the first component is penetrated through the first through-hole, and includes a first mounting portion and a second mounting portion located in the housing space, the first mounting portion is fixedly connected to the stator, and the second mounting portion is connected to the second component; the second component is penetrated through the second through-hole, and includes a supporting portion and a connecting portion located in the housing space, the rotor is rotatably sleeved on the supporting portion, the second mounting portion is detachably sleeved on the connecting portion, and after sleeved, the first component and the second component cannot rotate relative to each other; wherein the first component includes a mounting section and a sleeve section along the extension direction; the mounting section is close to the first end, suitable for The outer shell is rotatably mounted on the sleeve section; the first mounting portion is arranged on the radial outer side of the sleeve section, and the second mounting portion is arranged on the radial inner side of the sleeve section; the sleeve section includes a disc extending along a radial direction of the spindle, and a support ring surrounding the disc, and the stator is sleeved on the support ring; the support ring surrounds a setting space, and the rotor is at least partially arranged in the setting space. The hub motor as described in claim 1, wherein the radial outer side surface of the connecting portion is provided with a groove radially recessed toward the axis of the spindle, and the groove further has a sliding surface. The hub motor as described in claim 1, wherein the second component includes a protrusion extending along the radial direction, the sleeve section has a protrusion section along the extension direction in the setting space, and the rotor is sleeved between the protrusion section and the protrusion. The wheel hub motor as described in claim 1, wherein the disc body has a third through hole along the extension direction, and the second component is recessed toward the radial direction to form a wiring channel corresponding to the third through hole and extending along the extension direction. The wheel hub motor as described in claim 1, wherein the mounting section has a flange at one end close to the first end, and the flange is suitable for clamping the frame. The hub motor as described in claim 1, wherein the first component includes a channel recessed toward the radial direction and extending along the extension direction, and the channel is suitable for accommodating a power line electrically connected to the stator. The wheel hub motor as described in claim 6, wherein the channel includes a first section and a second section, the first section is located in the mounting section, the second section is located in the sleeve section, and the second section is connected to the interior of the sleeve section and faces the first component.