Bicycle hub motor with housing positioning structure

Abstract

This application provides a bicycle hub motor with a housing positioning structure, including a spindle assembly, a hub, a motor, a rotor seat, and a ratchet seat. The hub has a body, an annular connector, and a side cover. The body has an accommodating space and an opening, the accommodating space for accommodating the motor and the rotor seat. The annular connector is attached to the body and adjacent to the opening. The side cover is attached to the body to cover the opening and abuts against the annular connector. The side cover has a first protruding ring, the inner surface of the side cover forms abutting surface, and the inner circumferential surface of the first protruding ring forms a limiting surface. The ratchet seat has a disc portion, the disc portion is attached to the abutting surface and contacts the limiting surface. The annular connector improves the concentricity between the body and the side cover, and the first protruding ring achieves the effect of positioning the ratchet seat, providing a spindle assembly alignment mechanism and avoiding problems such as misalignment of the spindle assembly leading to assembly difficulties.

Description

Technical Field

[0001] This application relates to a bicycle hub motor; in particular, it refers to a bicycle hub motor with a housing positioning structure. Background Technology

[0002] A hub motor is known to use an internal drive mechanism to rotate a housing. When used in bicycles, hub motors are typically mounted on the axle of the front or rear wheel, with the motor's housing structure fixed to the wheel. In this way, when the hub motor is activated, the internal drive mechanism rotates the housing, which in turn drives the wheel connected to the motor's housing to rotate, thus providing riding assistance.

[0003] However, existing hub motors generally lack a good concentric positioning design between the drive mechanism and the housing, and the housing itself also lacks a positioning structure to improve concentricity. This leads to problems such as spindle misalignment or structural eccentricity during assembly. Although some products improve the above situation by increasing the tolerance accuracy of components, they still lack an effective geometric positioning structure, which can still easily cause assembly problems and positioning misalignment. These problems not only reduce assembly efficiency but may also shorten the life of the hub motor. Utility Model Content

[0004] The technical problem to be solved by this application is to provide a bicycle hub motor with a housing positioning structure, which can improve the concentricity between the drive mechanism and the housing and improve the problems of spindle misalignment and eccentricity.

[0005] To achieve the above objectives, this application provides a bicycle hub motor with a housing positioning structure, comprising a spindle assembly, a hub, a motor, a rotor seat, and a ratchet seat. The spindle assembly includes a spindle and a stator seat, with a rotation axis defined by the centerline of the spindle. The stator seat is connected to the outer peripheral surface of the spindle. The hub includes a body, an annular connector, and a side cover. The body has an accommodating space with an opening. The outer peripheral surface of the body forms multiple spoke seats. The center of the body has a first through hole, and the stator seat is accommodated in the accommodating space. The annular connector is engaged with the inner peripheral surface of the body and adjacent to the opening. The periphery of the side cover is engaged with the body to cover the opening and abut against the annular connector. The center of the side cover has an opening, and a first protruding ring is connected to the inner surface of the side cover around the opening. The inner surface of the side cover, between the opening and the first protruding ring, forms a contact surface. The inner circumferential surface of the first protruding ring forms a limiting surface, and the contact surface and the limiting surface are not parallel. The motor is disposed in the accommodating space and includes a stator and a rotor. The stator is fixed around the stator seat, and the rotor surrounds the outer circumferential surface of the stator and can rotate relative to the stator. The rotor seat is coupled to the rotor and is sleeved on the spindle in a manner that allows it to rotate along the axis of rotation. The ratchet seat includes a hub connecting part and a sprocket connecting part. The hub connecting part includes a disc part, and the disc part is coupled to the contact surface. The outer circumferential surface of the disc part contacts the limiting surface. The sprocket connecting part is rotatably sleeved around the spindle. A one-way drive structure is provided between the sprocket connecting part and the hub connecting part. The radial outer circumferential surface of the sprocket connecting part is provided with multiple grooves.

[0006] The effect of this application is that the side cover, through the abutment surface and the limiting surface formed by the first convex ring, achieves the effect of well positioning and engaging the disc portion of the ratchet seat at the center of the side cover, ensuring that the ratchet seat also takes the rotation axis as the center of rotation. During assembly, it can provide a good alignment mechanism for the spindle assembly, avoiding problems such as misalignment of the spindle assembly and assembly difficulties.

[0007] The other effects and embodiments of this application are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] Figure 1This is a perspective view of a bicycle hub motor with a housing positioning structure according to a preferred embodiment of this application;

[0010] Figure 2 This is a partially exploded view of the bicycle hub motor with a housing positioning structure according to the preferred embodiment described above.

[0011] Figure 3 for Figure 2 Another perspective of partial exploded view;

[0012] Figure 4 This is an exploded view of the mandrel assembly;

[0013] Figure 5 This is a front view of the bicycle hub motor with a housing positioning structure according to the preferred embodiment described above;

[0014] Figure 6A for Figure 5 A 6-6 sectional view;

[0015] Figure 6B For similar Figure 6A The sectional view reveals the connection method of the reduction mechanism;

[0016] Figure 7 for Figure 5 Sectional view in direction 7-7.

[0017] Symbol Explanation

[0018] 100: Bicycle hub motor; 10: Spindle assembly

[0019] 12: Mandrel 121: First shaft section

[0020] 1211: Hollow tube; 1212: Sleeve

[0021] 122: Second shaft portion; 1221: Non-circular outer circumferential surface

[0022] 14: Stator mount 20: Wheel hub

[0023] 22: Main body 221: Opening

[0024] 222: Spoke seat; 223: First perforation

[0025] 2231: Body bearing housing; 24: Annular connecting piece

[0026] 241: Positioning groove; 25: Side cover

[0027] 251: Opening 252: First protruding ring

[0028] 253: Second convex ring; 254: Abutting surface

[0029] 255: Limiting surface; 256: Second fastener hole

[0030] 26: First bearing 27: Fastener

[0031] 30: Motor; 32: Stator

[0032] 34: Rotor 341: Third convex ring

[0033] 40: Rotor seat 41: Rotor seat positioning groove

[0034] 42: Rotor bearing housing; 43: Third bearing

[0035] 50: Reduction mechanism; 51: Input end

[0036] 52: Output end 53: Planetary gear carrier

[0037] 531: Shaft hole; 54: First planetary gear

[0038] 55: Second planetary gear; 56: Pin shaft

[0039] 60: Ratchet seat; 62: Hub connection part

[0040] 621: Body 622: Disc

[0041] 623: Ratchet groove 624: Ratchet

[0042] 625: First fastener hole; 626: Second through hole

[0043] 6261: Disc bearing housing; 64: Sprocket connection part

[0044] 641: Ratchet 642: Gutter

[0045] 66: Second bearing; 70: Power cord

[0046] L: Rotation axis; S: Accommodation space

[0047] X: Unidirectional drive structure Detailed Implementation

[0048] In the embodiments described below, the positional relationships include: up, down, left, and right. Unless otherwise specified, they are all based on the direction shown by the components in the diagram.

[0049] Please refer to Figures 1 to 3 and Figure 6AAs shown, a preferred embodiment of the present application is a bicycle hub motor 100 with a housing positioning structure, including a spindle assembly 10, a hub 20, a motor 30, a rotor seat 40, a reduction mechanism 50, and a ratchet seat 60. The following description of the bicycle hub motor 100 will be based on the state of the bicycle hub motor 100 in use, and will describe the front-back and up-down directions of each part of the bicycle hub motor 100.

[0050] like Figures 4 to 6A As shown, the spindle assembly 10 includes a spindle 12 and a stator seat 14. The spindle 12 has a first shaft portion 121 and a second shaft portion 122. A rotation axis L is defined by the center line of the first shaft portion 121 and the second shaft portion 122, and the rotation axis L serves as the rotation center of the bicycle hub motor 100. The first shaft portion 121 has a hollow tube 1211, and a sleeve hole 1212 is formed at one end of the hollow tube 1211. The sleeve hole 1212 is a non-circular hole, and the inner circumferential surface of the non-circular hole is approximately shaped like a dome. The two sides of the circular shaft 122 are parallel surfaces. The outer peripheral surface of the end of the second shaft 122 facing the first shaft 121 is a non-circular outer peripheral surface 1221 that mates with a non-circular hole. The end of the second shaft 122 with the non-circular outer peripheral surface 1221 is embedded in the sleeve hole 1212. In this way, the second shaft 122 is connected to the first shaft 121 and will not rotate relative to the first shaft 121. The stator seat 14 is a circular disc and the inner peripheral surface of the stator seat 14 is connected to the outer peripheral surface of the hollow tube 1211.

[0051] like Figure 2 , Figures 5 to 6A As shown, the hub 20 includes a body 22, an annular connector 24, and a side cover 25. The body 22 is a transversely arranged groove, with an opening 221 formed on the right side of the body 22. The body 22 has multiple spoke seats 222, a first through hole 223, and an accommodating space S. The spoke seats 222 are disposed on the outer peripheral surface of the body 22. The two ends of the bicycle spokes are respectively connected to the spoke seats 222 and the bicycle rim. When the body 22 rotates, the bicycle rim can be rotated through the bicycle spokes. The first through hole 223 is located at the center of the left side of the body 22. Hole 223 has a main bearing seat 2231, in which a first bearing 26 is embedded. The hollow tube 1211 of the first shaft portion 121 is pivotally inserted through the first bearing 26. The main body 22 is rotatably fitted onto the first shaft portion 121 through the first bearing 26. In this way, when the first shaft portion 121 is fixed, the main body 22 can rotate relative to the first shaft portion 121 about the rotation axis L. A accommodating space S is formed inside the main body 22, and an opening 221 is formed on the right side of the accommodating space S. The accommodating space S is used to accommodate the stator seat 14, the motor 30, the rotor seat 40, and the reduction mechanism 50.

[0052] like Figures 2 to 3 and Figures 5 to 6AAs shown, the annular connector 24 is a ring and is screwed onto the inner circumferential surface of the body 22. The annular connector 24 is adjacent to the opening 221 and has an annular positioning groove 241 on its outer surface facing the opening 221. The side cover 25 is a circular cover and is screwed onto the body 22 with its periphery, so that the side cover 25 covers the opening 221 and abuts against the annular connector 24. The side cover 25 has an opening 251, a first protruding ring 252 and a second protruding ring 253. The opening 251 is located at the center of the side cover 25. The first protruding ring 252 is... The inner side of the side cover 25 is positioned around the opening 251. The portion of the inner side of the side cover 25 between the first protruding ring 252 and the opening 251 forms a contact surface 254. The inner circumferential surface of the first protruding ring 252 forms a limiting surface 255. The contact surface 254 and the limiting surface 255 are not parallel. In this preferred embodiment, the limiting surface 255 is perpendicular to the contact surface 254. The second protruding ring 253 is disposed on the periphery of the inner side of the side cover 25. The second protruding ring 253 is engaged in the positioning groove 241, thereby increasing the concentricity of the side cover 25 and the body 22 during assembly.

[0053] like Figures 5 to 6A As shown, the motor 30 includes a stator 32 and a rotor 34. The stator 32 is fixed to the outer peripheral surface of the stator seat 14. A third convex ring 341 is attached to the outer surface of the rotor 34. The rotor 34 is spaced apart from the stator 32 and surrounds the stator 32. The rotor seat 40 has a rotor seat positioning groove 41 and a rotor bearing seat 42. The third convex ring 341 is engaged in the rotor seat positioning groove 41. When the rotor 34 rotates, it can drive the rotor seat 40 to rotate. The rotor bearing seat 42 is located at the center of the rotor seat 40. Two third bearings 43 are embedded in the rotor bearing seat 42. A part of the second shaft portion 122 pivotally passes through the two third bearings 43. The rotor 34 and the rotor seat 40 are rotatably fitted onto the second shaft portion 122 through the two third bearings 43.

[0054] like Figures 5 to 6A As shown, a power line 70 is externally connected to the bicycle hub motor 100. The power line 70 is electrically connected to the stator 32, so current can be passed into the stator 32 to generate an electromagnetic field, which in turn generates a driving force to rotate the rotor 34, thereby causing the rotor base 40 to rotate relative to the stator 32 around the rotation axis L. The rotational speed of the rotor 34 relative to the stator 32 can be controlled by changing the input voltage or frequency.

[0055] like Figure 6BAs shown, the reduction mechanism 50 includes an input end 51, an output end 52, a planetary gear carrier 53, a plurality of first planetary gears 54, and a plurality of second planetary gears 55. The input end 51 is a ring-shaped sun gear and is concentrically coupled to the central part of the rotor seat 40. The second shaft portion 122 passes through the middle of the input end 51, so that the input end 51 is rotatably disposed around the second shaft portion 122. The output end 52 is a circular gear ring and is coupled to the annular connector 24. The planetary gear carrier 53 is an annular body and has a plurality of annularly arranged shaft holes 531. 53 surrounds the second shaft portion 122 and can rotate relative to the second shaft portion 122 about the rotation axis L, with a pin 56 pivotally passing through each of the shaft holes 531; the first planetary gears 54 are arranged in a ring around the input end 51 and respectively mesh with the input end 51, and the center of each of the first planetary gears 54 is rotatably connected to one end of each pin 56; the second planetary gears 55 are arranged in a ring and respectively mesh with the output end 52, and the center of each of the second planetary gears 55 is rotatably connected to the other end of each pin 56.

[0056] During operation, the rotor base 40 drives the input end 51 to rotate, the input end 51 drives the first planetary gears 54 to rotate, the first planetary gears 54 in turn drive the planetary gear carrier 53 and the second planetary gears 55 to rotate, the second planetary gears 55 mesh with the output end 52, and finally make the annular connector 24 rotate at a lower speed relative to the input end 51, so as to achieve the effect of deceleration.

[0057] like Figure 2 , Figure 3 and Figure 7 As shown, the ratchet seat 60 includes a hub connection part 62 and a sprocket connection part 64. The hub connection part 62 includes a cylindrical body 621 and a disc part 622. The cylindrical body 621 is a cylindrical tube. The cylindrical body 621 is slightly larger than the second shaft part 122, and the cylindrical body 621 is rotatably fitted onto the second shaft part 122. The outer circumferential surface of the cylinder body 621 is provided with three pawl grooves 623, and a pawl 624 is provided in each pawl groove 623. The inner circumferential surface of the disc part 622 is connected to the inner end of the cylinder body 621. The disc part 622 has a plurality of first fastener holes 625 and a second through hole 626. During installation, the cylinder body 621 passes through the opening 251, so that the disc part 622 abuts against the abutment surface 254. The abutment surface 254 forms a plurality of second fastener holes 256 corresponding to the positions of the first fastener holes 625. A fastener 27 is inserted into each second fastener hole 256. Each fastener 27 passes through each first fastener hole 625, so that the disc part 622 is engaged with the abutment surface 254, and the outer circumferential surface of the disc part 622 contacts the limiting surface 255, thereby increasing the concentricity of the hub connection part 62 and the side cover 25.

[0058] like Figure 2 , Figure 3 and Figure 6A As shown, the second through hole 626 is located at the center of the disc portion 622. The second through hole 626 has a disc bearing seat 6261, and a second bearing 66 is embedded in the disc bearing seat 6261. The other end of the second shaft portion 122 is pivotally connected to the second bearing 66 and the cylinder body 621 in sequence. The hub connecting portion 62 is rotatably fitted to the second shaft portion 122 through the second bearing 66. The hub connecting portion 62 can rotate relative to the second shaft portion 122 around the rotation axis L.

[0059] like Figure 2 , Figure 3 and Figure 7 As shown, the sprocket connecting part 64 is a cylindrical body and rotatably fits around the hub connecting part 62. The sprocket connecting part 64 has multiple ratchet teeth 641 and multiple grooves 642. Each ratchet tooth 641 is arranged in a circular manner on the inner circumferential surface of the sprocket connecting part 64. Each pawl 624 engages with each ratchet tooth 641 in a unidirectional engagement manner. A unidirectional drive structure X is formed between the hub connecting part 62 and the sprocket connecting part 64, meaning that the sprocket connecting part 64 can only drive the hub connecting part 62 forward. When the sprocket connection 64 rotates backward, the sprocket connection 64 cannot drive the hub connection 62 to rotate backward together. Each groove 642 is provided on the radial outer circumferential surface of the sprocket connection 64. The sprocket connection 64 is connected to a freewheel (not shown in the figure) through each groove 642. The bicycle chain is wrapped around the freewheel. When the user steps forward on the bicycle pedal, the bicycle chain drives the freewheel to rotate, which in turn drives the hub 20 of the bicycle hub motor 100 to rotate through the one-way drive structure X.

[0060] In summary, the advantages of this application are that the side cover 25 is engaged with the positioning groove 241 of the annular connector 24 by the second protruding ring 253, and the side cover 25 is screwed onto the body 22, which can increase the concentricity between the body 22 and the side cover 25, ensuring that the first through hole 223 of the body 22 and the opening 251 of the side cover 25 are both centered on the rotation axis L; and the side cover 25 achieves a good positioning effect of the ratchet seat 60 disc 622 at the center of the side cover 25 through the abutment surface 254 and the limiting surface 255 formed by the first protruding ring 252, ensuring that the ratchet seat 60 is also centered on the rotation axis L. During assembly, it can provide a good alignment mechanism for the spindle assembly 10, avoiding problems such as misalignment of the spindle assembly 10.

[0061] The embodiments and / or implementation methods described above are merely preferred embodiments and / or implementation methods for implementing the technology of this application, and are not intended to limit the implementation methods of the technology of this application in any way. Any person skilled in the art may make some modifications or alterations to other equivalent embodiments without departing from the scope of the technical means disclosed in this application, but these should still be regarded as the technology or embodiments that are substantially the same as those of this application.

Claims

1. A bicycle hub motor with a housing positioning structure, characterized in that, The bicycle hub motor includes: A spindle assembly includes a spindle and a stator base, with a rotation axis defined by the center line of the spindle, and the stator base connected to the outer peripheral surface of the spindle; A wheel hub includes a body, an annular connector, and a side cover. The body has an accommodating space with an opening. The outer peripheral surface of the body forms multiple spoke seats. The center of the body has a first through hole. The stator seat is accommodated in the accommodating space. The annular connector is attached to the inner peripheral surface of the body and adjacent to the opening. The periphery of the side cover is attached to the body to cover the opening and abut against the annular connector. The center of the side cover has an opening. A first protruding ring is connected to the inner surface of the side cover around the opening. The portion of the inner surface of the side cover between the opening and the first protruding ring forms a contact surface. The inner peripheral surface of the first protruding ring forms a limiting surface, and the contact surface and the limiting surface are not parallel. A motor is disposed in the accommodating space and includes a stator and a rotor. The stator is fixed to the outer peripheral surface of the stator base, and the rotor surrounds the stator and can rotate relative to the stator. A rotor seat is attached to the rotor and is fitted onto the spindle in a manner that allows it to rotate along the axis of rotation; A ratchet seat includes a hub connection portion and a sprocket connection portion. The hub connection portion includes a disc portion, which is engaged with the abutment surface, and the outer peripheral surface of the disc portion contacts the limiting surface. The sprocket connection portion is rotatably surrounding the spindle. A one-way drive structure is provided between the sprocket connection portion and the hub connection portion. The radial outer peripheral surface of the sprocket connection portion is provided with a plurality of grooves.

2. The bicycle hub motor with a housing positioning structure according to claim 1, characterized in that, The disc has a plurality of first fastener holes, and the abutment surface forms a plurality of second fastener holes corresponding to the positions of the first fastener holes. A fastener is inserted into each of the second fastener holes, and each fastener passes through each of the first fastener holes.

3. The bicycle hub motor with a housing positioning structure according to claim 1, characterized in that, The first through hole of the main body has a main body bearing seat, in which a first bearing is embedded. The center of the disc portion has a second through hole, in which a disc portion bearing seat is embedded. One end of the spindle passes through the first bearing, and the other end of the spindle passes through the second bearing.

4. The bicycle hub motor with a housing positioning structure according to claim 3, characterized in that, The spindle includes a first shaft portion and a second shaft portion. The first shaft portion has a hollow tube that is pivotally inserted through the first bearing. A sleeve hole is formed at one end of the hollow tube facing the opening. The sleeve hole is a non-circular hole. One end of the second shaft portion is fitted into the sleeve hole, and the other end of the second shaft portion is pivotally inserted through the second bearing.

5. The bicycle hub motor with a housing positioning structure according to claim 4, characterized in that, The inner circumferential surface of the stator base is connected to the outer circumferential surface of the hollow tube.

6. The bicycle hub motor with a housing positioning structure according to claim 1, characterized in that, The side cover is connected to a second protruding ring at the periphery of its inner side. The annular connector has an annular positioning groove on its outer side facing the opening, and the second protruding ring is engaged in the positioning groove.

7. The bicycle hub motor with a housing positioning structure according to claim 1, characterized in that, The sprocket connection part is provided with multiple ratchet teeth, and the hub connection part is provided with multiple pawl grooves. Each pawl groove is provided with a pawl, and each pawl is engaged with each ratchet tooth in a one-way engagement manner.

8. The bicycle hub motor with a housing positioning structure according to claim 1, characterized in that, It also includes a speed reduction mechanism disposed within the accommodating space and including an input end and an output end. The input end is a sun gear and is coupled to the center of the rotor seat. The input end is rotatably disposed around the spindle. The output end is a gear ring and is coupled to the annular connector.

9. The bicycle hub motor with a housing positioning structure according to claim 8, characterized in that, The reduction mechanism also includes a planetary gear carrier, a plurality of first planetary gears, and a plurality of second planetary gears. The planetary gear carrier surrounds the spindle. The first planetary gears are rotatably connected to one side of the planetary gear carrier and are arranged in a ring around the input end, meshing with the input end. The second planetary gears are rotatably connected to the other side of the planetary gear carrier and are arranged in a ring, meshing with the output end.

10. The bicycle hub motor with a housing positioning structure according to claim 9, characterized in that, The planetary gear carrier has a plurality of annularly arranged shaft holes, through which a pin is pivotally inserted. The centers of the first planetary gears are rotatably connected to one end of the pin, and the centers of the second planetary gears are rotatably connected to the other end of the pin.

Images