Hub motor assembly and moped

Abstract

The utility model discloses a kind of hub motor assemblies and mules, hub motor assembly includes hub motor, hollow shaft, planetary transmission mechanism, clutch and shell, the hub motor, planetary transmission mechanism, clutch and shell are coaxially arranged in the hollow shaft outside, the hub motor, planetary transmission mechanism, clutch are set in the shell, the hub motor is inner rotor motor, the hub motor connects the planetary transmission mechanism, the planetary transmission mechanism is connected the shell by the clutch. The volume of the hub motor assembly of the utility model is small, light in weight, can be directly installed on bicycle, and dismounting is convenient.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, specifically to a hub motor assembly and a power-assisted bicycle. Background Technology

[0002] Existing hub motor assemblies typically use a solid shaft for the central shaft and are mounted on bicycles using double-ended locking nuts. This traditional mounting method is inconvenient for disassembly and maintenance, and the hub motor assemblies are also large and heavy. Utility Model Content

[0003] To address at least one of the problems mentioned in the background section, this utility model provides a hub motor assembly and an electric bicycle. The hub motor assembly is small in size and light in weight, can be directly installed on a bicycle, and is easy to assemble and disassemble.

[0004] The specific technical solution provided by this utility model is as follows:

[0005] In a first aspect, a hub motor assembly is provided, comprising a hub motor, a hollow shaft, a planetary transmission mechanism, a clutch, and a housing. The hub motor, the planetary transmission mechanism, the clutch, and the housing are all coaxially disposed outside the hollow shaft. The hub motor, the planetary transmission mechanism, and the clutch are all disposed inside the housing. The hub motor is an internal rotor motor. The hub motor is connected to the planetary transmission mechanism, and the planetary transmission mechanism is connected to the housing through the clutch.

[0006] As a preferred embodiment of the above solution, the hub motor assembly further includes a cable outlet, which is coaxially disposed on the hollow shaft. The cable outlet has a cable outlet hole, and a coil is disposed in the cable outlet hole. The hub motor includes a stator and an inner rotor, and the coil is connected to the stator.

[0007] As a preferred embodiment of the above solution, the hub motor assembly further includes a stator bracket, which is coaxially arranged adjacent to the cable outlet on the hollow shaft. The stator bracket is mounted inside the housing via a bearing, and the stator is fixed inside the stator bracket. The stator bracket is provided with a cable pass hole, through which the coil passes.

[0008] As a preferred embodiment of the above solution, a positioning key is provided on the outer wall of the hollow shaft, and corresponding positioning grooves are provided on the cable outlet and the stator bracket, with the positioning key disposed in the positioning groove.

[0009] As a preferred embodiment of the above scheme, the planetary transmission mechanism includes a primary planetary mechanism, a secondary planetary mechanism, and a gear ring. The gear ring is fixed within the stator support. The primary planetary mechanism includes a rotor sun gear, primary planetary gears, and a primary planetary carrier. The rotor sun gear is fixed to the inner rotor. The secondary planetary mechanism includes a secondary sun gear, secondary planetary gears, and a secondary planetary carrier. Both the primary and secondary planetary gears mesh with the gear ring. The number of primary planetary gears is less than the number of secondary planetary gears. The secondary planetary carrier is connected to the outer casing via the clutch.

[0010] As a preferred embodiment of the above solution, the housing includes a housing body and an end cover that are fixedly connected. The stator, inner rotor, planetary transmission mechanism, and clutch are all disposed within the housing body. A circular protrusion is provided in the middle of the end cover, and the clutch is fixed to the circular protrusion by a fixing sleeve.

[0011] As a preferred embodiment of the above solution, the end cap has a groove on the end face opposite to the circular protrusion, a tower base gear ring is fixedly connected to the groove, the tower base gear ring has a tooth groove, the hollow shaft is fitted with a tower base, the tower base has a helical tooth, and the helical tooth is engaged in the tooth groove.

[0012] As a preferred embodiment of the above solution, the outer wall of the outer shell is provided with a plurality of straight strip holes.

[0013] As a preferred embodiment of the above solution, the clutch includes a needle roller one-way clutch.

[0014] By employing the above technical solution, the hub motor assembly of this utility model coaxially arranges the hub motor, planetary transmission mechanism, clutch, and housing outside the hollow shaft. This results in a hollow center for the motor. When installing the hub motor assembly, a thru-axle from the bicycle can be directly passed through the hollow shaft and locked to the bicycle without any modification to the bicycle. The hub motor assembly is easy to install and remove, and its small size and light weight contribute to weight reduction. When the hub motor assembly is working, the hub motor drives the planetary transmission mechanism to rotate, which in turn drives the housing to rotate via the clutch. The housing then drives the rear wheel of the bicycle to rotate.

[0015] Secondly, a power-assisted bicycle is provided, including the aforementioned hub motor assembly.

[0016] As a preferred embodiment of the above solution, the electric bicycle also includes a hub axle, a spoke, a rim, and a rear frame. The outer shell is connected to the rim via the spoke, the hub axle passes through the center of the hollow shaft, and the hub axle is fixed to the rear frame.

[0017] Using the above technical solution, the hub motor assembly of this utility model for the electric bicycle is installed by first connecting the outer shell to the rim via the spokes of the rear wheel, then passing a barrel axle through the hollow shaft and locking the barrel axle to the rear frame of the electric bicycle via threads, thus completing the assembly of the hub motor assembly. No modifications are required to the bicycle; simply assembling the hub motor assembly transforms it into an electric bicycle. The hub motor assembly is easy to assemble and disassemble, and its small size and light weight enhance the lightweight design of the electric bicycle. When the hub motor assembly is working, the hub motor drives the planetary transmission mechanism to rotate, which in turn drives the outer shell to rotate via a clutch. The outer shell then drives the rear wheel of the electric bicycle to rotate via the spokes and the rim. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 for Figure 1 A schematic diagram of the structure viewed from below;

[0021] Figure 3 for Figure 1 A schematic diagram of the structure with the outer shell removed;

[0022] Figure 4 for Figure 3 A structural schematic diagram of the stator support is omitted.

[0023] Figure 5 for Figure 4 A structural diagram of the stator and gear ring is omitted.

[0024] Figure 6 for Figure 5 Partial top view of the structure;

[0025] Figure 7 This is a schematic diagram of the stator support structure of this utility model;

[0026] Figure 8 This is a schematic diagram of the cable outlet base of this utility model. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0028] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. The terms "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," and "bottom," etc., used in this specification to indicate orientation or positional relationships are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] The following content is for reference only. Figures 1 to 8 .

[0030] Example 1

[0031] This utility model provides a hub motor assembly, including a hub motor, a hollow shaft 1, a planetary transmission mechanism 4, a clutch 5, and a housing 6. The hub motor, the planetary transmission mechanism 4, the clutch 5, and the housing 6 are all coaxially arranged outside the hollow shaft 1, and the hub motor, the planetary transmission mechanism 4, and the clutch 5 are all arranged inside the housing 6. The hub motor is an internal rotor motor. The hub motor is connected to the planetary transmission mechanism 4, and the planetary transmission mechanism 4 is connected to the housing 6 through the clutch 5.

[0032] The hub motor assembly also includes a cable outlet 7, which is coaxially mounted on the hollow shaft 1. The cable outlet 7 has a cable outlet hole 71, and a coil (not shown) is disposed within the cable outlet hole 71. The hub motor includes a stator 2 and an inner rotor 3, and the coil is connected to the stator 2. In this embodiment, a Hall plate 8 is also provided on one side of the stator 2, coaxially mounted on the hollow shaft 1. The Hall plate 8 is connected to a Hall wire (not shown), which also passes through the cable outlet hole 71. In this invention, the motor wires exit through the cable outlet 7, without passing through the hollow shaft 1. This does not affect the assembly of the hub motor assembly by having the shaft pass through the hollow shaft 1, making the assembly of the hub motor assembly convenient. The hub motor assembly also includes a stator bracket 9, which is coaxially mounted on the hollow shaft 1 adjacent to the cable outlet 7. The stator bracket 9 is housed within the housing 6 via a bearing 10. The stator 2 is fixed within the stator bracket 9. The stator bracket 9 has a wire-passing hole 91 through which the coil passes. A positioning key 11 is provided on the outer wall of the hollow shaft 1, and corresponding positioning grooves 20 are provided on the cable outlet 71 and the stator bracket 9. The positioning key 11 is disposed within the positioning grooves 20.

[0033] The planetary transmission mechanism 4 includes a primary planetary mechanism 41, a secondary planetary mechanism 42, and a gear ring 43. The gear ring 43 is fixed inside the stator support 9. The primary planetary mechanism 41 includes a rotor sun gear 411, primary planetary gears 412, and a primary planet carrier 413. The rotor sun gear 411 is fixed to the inner rotor 3. The secondary planetary mechanism 42 includes a secondary sun gear 421, secondary planetary gears 422, and a secondary planet carrier 423. Both the primary planetary gears 412 and the secondary planetary gears 422 mesh with the gear ring 43. The number of primary planetary gears 412 is less than the number of secondary planetary gears 422. The secondary planet carrier 423 is connected to the outer casing 6 through the clutch 5. In this embodiment, there are three primary planetary gears 412, each meshing with the rotor sun gear 411. The primary planetary gears 412 are mounted on the primary planetary carrier 413 via primary support pillars (not shown). There are four secondary planetary gears 422, each meshing with the secondary sun gear 421. The secondary sun gear 421 is fixedly connected to the primary planetary carrier 413. The secondary planetary gears 422 are mounted on the secondary planetary carrier 423 via secondary support pillars (not shown). This invention employs a two-stage gear transmission, increasing the reduction ratio, increasing the motor output torque, and making the torque adjustable. The primary planetary gears 412 and secondary planetary gears 422 operate on the same gear ring 43, resulting in a smaller and lighter motor.

[0034] The outer casing 6 includes a fixedly connected outer casing body 61 and an end cover 62. The stator support 9, stator 2, inner rotor 3, planetary transmission mechanism 4, and clutch 5 are all disposed within the outer casing body 61. The end cover 62 has a circular protrusion 621 in the middle, and the clutch 5 is fixedly mounted on the circular protrusion 621 by a fixing sleeve 30. In this embodiment, the outer casing body 61 and the end cover 62 are connected by bolts 40, and the fixing sleeve 30 is a steel sleeve, which is connected to the circular protrusion 621 by multiple steel sleeve pins 50. The end face of the end cover 62 opposite to the circular protrusion 621 has a groove 622, and a base gear ring 60 is fixedly connected to the groove 622. The base gear ring 60 has a toothed groove 601, and a base 70 is sleeved on the hollow shaft 1. The base has helical teeth 701, which are engaged in the toothed groove 601. In this embodiment, the bicycle's freewheel is mounted on the freewheel base 70. The clutch 5 drives the end cover 62 to rotate, which in turn drives the freewheel base 70 to rotate. The freewheel base 70 is also connected to a speed-measuring magnet freewheel base cover 80 and a nut 90. The nut 90 engages with the threaded connection of the spool shaft to lock the freewheel base 70. The speed-measuring magnet freewheel base cover 80 has multiple holes 81 for mounting magnets (not shown) and is used to detect the bicycle speed. The outer wall of the housing 6 has multiple straight-pull bar holes 64 for connecting spokes (not shown). The clutch 5 includes a needle roller one-way clutch.

[0035] In addition, the hub motor assembly of this utility model is provided with sealing rings (not shown) at corresponding positions of each component to ensure sealing; bearings (not shown) and shaft retaining rings (not shown) are provided at corresponding rotation positions to ensure reliable rotation.

[0036] The hub motor assembly of this utility model features a stator 2, inner rotor 3, planetary transmission mechanism 4, clutch 5, and housing 6 all coaxially arranged outside the hollow shaft 1. This results in a hollow center for the motor. When installing the hub motor assembly, a thru-axle from the bicycle can be directly passed through the hollow shaft 1 and locked to the bicycle without any modifications. The hub motor assembly is easy to install and remove, and its small size and light weight contribute to weight reduction. When the hub motor assembly is working, the stator 2 drives the inner rotor 3 to rotate, which in turn drives the planetary transmission mechanism 4 to rotate. The planetary transmission mechanism 4, through the clutch 5, drives the housing 6 to rotate, which in turn drives the rear wheel of the bicycle to rotate.

[0037] Example 2

[0038] This utility model provides a power-assisted bicycle, including a hub motor assembly, a hub axle, a spoke, a rim, and a rear frame as described in Embodiment 1. The outer shell is connected to the rim via the spoke, and the hub axle passes through the center of the hollow shaft and is fixed to the rear frame. In this embodiment, one end of the cable outlet is further provided with an anti-rotation block 90, which is mounted on the rear frame for fixing the hub motor assembly.

[0039] When installing the hub motor assembly of this utility model for an electric bicycle, firstly, the outer shell is connected to the rim via the rear wheel spokes. Then, the freewheel is installed on the freewheel base. Next, a thru-axle is passed through the hollow shaft and locked to the rear frame of the electric bicycle via threads, thus completing the assembly of the hub motor assembly. No modifications to the bicycle are required; simply assembling the hub motor assembly directly transforms the bicycle into an electric bicycle. The hub motor assembly is easy to assemble and disassemble, and its small size and light weight contribute to the lightweight design of the electric bicycle. When the hub motor assembly is working, the stator drives the inner rotor to rotate, which in turn drives the planetary transmission mechanism. The planetary transmission mechanism drives the outer shell to rotate via a clutch, and the outer shell drives the rear wheel of the electric bicycle to rotate via the spokes and rim. This utility model's hub motor assembly effectively replaces the thru-axle hub when mounted on the bicycle.

[0040] Although preferred embodiments of the present invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the present invention.

[0041] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A hub motor assembly, characterized in that, The device includes a hub motor, a hollow shaft, a planetary transmission mechanism, a clutch, and a housing. The hub motor, planetary transmission mechanism, clutch, and housing are all coaxially arranged outside the hollow shaft. The hub motor, planetary transmission mechanism, and clutch are all arranged inside the housing. The hub motor is an internal rotor motor. The hub motor is connected to the planetary transmission mechanism, and the planetary transmission mechanism is connected to the housing through the clutch.

2. The hub motor assembly according to claim 1, characterized in that, It also includes a cable outlet seat, which is coaxially mounted on the hollow shaft. The cable outlet seat has a cable outlet hole, and a coil is provided in the cable outlet hole. The hub motor includes a stator and an inner rotor, and the coil is connected to the stator.

3. The hub motor assembly according to claim 2, characterized in that, It also includes a stator support, which is coaxially arranged adjacent to the lead-out seat on the hollow shaft. The stator support is mounted inside the housing via a bearing, and the stator is fixed inside the stator support. The stator support is provided with a wire-passing hole, through which the coil passes.

4. The hub motor assembly according to claim 3, characterized in that, The hollow shaft has a positioning key on its outer wall, and the cable outlet and the stator bracket have corresponding positioning grooves. The positioning key is located in the positioning groove.

5. The hub motor assembly according to claim 3, characterized in that, The planetary transmission mechanism includes a primary planetary mechanism, a secondary planetary mechanism, and a gear ring. The gear ring is fixed inside the stator support. The primary planetary mechanism includes a rotor sun gear, primary planet gears, and a primary planet carrier. The rotor sun gear is fixed to the inner rotor. The secondary planetary mechanism includes a secondary sun gear, secondary planet gears, and a secondary planet carrier. Both the primary and secondary planet gears mesh with the gear ring. The number of primary planet gears is less than the number of secondary planet gears. The secondary planet carrier is connected to the outer casing via the clutch.

6. The hub motor assembly according to claim 5, characterized in that, The housing includes a housing body and an end cover that are fixedly connected. The stator, inner rotor, planetary transmission mechanism and clutch are all disposed in the housing body. The end cover has a circular protrusion in the middle. The clutch is fixed to the circular protrusion by a fixed sleeve.

7. The hub motor assembly according to claim 6, characterized in that, The end cap has a groove on the end face opposite to the circular protrusion. A tower base gear ring is fixedly connected to the groove. The tower base gear ring has a toothed groove. A tower base is sleeved on the hollow shaft. The tower base has helical teeth, which are engaged in the toothed groove.

8. The hub motor assembly according to claim 1, characterized in that, The outer wall of the casing is provided with multiple straight strip holes.

9. A power-assisted bicycle, characterized in that, Includes the hub motor assembly as described in any one of claims 1-8.

10. The electric bicycle according to claim 9, characterized in that, It also includes a barrel axle, spokes, rims and a rear frame. The housing is connected to the rims via the spokes. The barrel axle passes through the center of the hollow shaft and is fixed to the rear frame.

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