A hub motor with integrated gear mechanism

Abstract

The application discloses a hub motor integrated with a variable speed mechanism and relates to the field of hub motors. The technical scheme points of the hub motor integrated with the variable speed mechanism comprise a main shaft, a hub and an end cover which are connected with each other, a machine core assembly which is connected with the hub and a variable speed mechanism which is connected with the end cover are arranged on the main shaft respectively, the variable speed mechanism comprises a centrifugal driving assembly, the centrifugal driving assembly is connected with the end cover, and the state switching is realized according to the rotating speed of the end cover. The automatic switching of the gear position is realized according to the output speed, the gear shifting frequency can be reduced, the service life is prolonged, and the riding experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of hub motors, more particularly, it relates to a hub motor integrated with a variable speed mechanism. BACKGROUND

[0002] Generally, the internal variable speed mechanism uses centrifugal force to achieve automatic speed change. When the pedal frequency speed reaches a certain speed, the centrifugal block is thrown off to achieve automatic upshift. When the pedal frequency speed decreases below the speed change point, the centrifugal block will contract to achieve automatic downshift. For example, as shown in the Chinese patent with the authorization announcement number CN208882034U.

[0003] The existing Chinese patent with the authorization announcement number CN211996037U discloses a hub motor and internal variable speed hub integrated device, which includes a main shaft, an internal variable speed hub and a hub motor are respectively sleeved on the main shaft, an end cover is arranged on the internal variable speed hub, the hub motor includes a winding stator, a rotor, a sun gear, a motor clutch, an internal gear ring and a hub, the internal variable speed hub adopts a centrifugal internal variable speed hub, which can automatically realize speed regulation according to the speed of the flywheel.

[0004] The centrifugal variable speed hub in the above-mentioned patent uses centrifugal force to achieve automatic speed change. When the pedal frequency speed reaches a certain speed, the centrifugal block is thrown off to achieve automatic upshift. When the pedal frequency speed decreases below the speed change point, the centrifugal block will contract to achieve automatic downshift.

[0005] However, for a vehicle using the above-mentioned hub motor and internal variable speed hub integrated device, when the vehicle is running at high speed (greater than the speed change point), if the rider does not want to pedal, or does not need to pedal when downhill, the internal variable speed hub will automatically downshift due to the decrease of the pedal frequency speed of the rider. When the vehicle is still running at high speed (greater than the speed change point) after sliding for a distance, the rider needs to make the pedal frequency speed reach the speed change point within a short time after pedaling again to make the internal variable speed hub automatically upshift. In this case, the automatic downshift of the internal variable speed hub will affect the riding experience, and the increase of the gear shifting frequency will easily cause the failure of the internal variable speed hub, affecting its service life. SUMMARY

[0006] In view of the deficiencies in the prior art, the purpose of the present application is to provide a hub motor integrated with a variable speed mechanism, which can automatically switch the gear position according to the output speed, reduce the gear shifting frequency, prolong the service life, and improve the riding experience.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A hub motor with an integrated speed change mechanism includes a main shaft, on which a hub and an end cover are connected to each other. The main shaft is respectively provided with a core assembly connected to the hub and a speed change mechanism connected to the end cover. The speed change mechanism includes a centrifugal drive assembly.

[0009] The centrifugal drive assembly is connected to the end cap and switches states according to the rotational speed of the end cap.

[0010] Furthermore, the centrifugal drive assembly includes a centrifugal block, on which a shaft connected to the end cap is threaded; the centrifugal block can switch from a contracted state to an open state according to the rotational speed of the end cap.

[0011] Furthermore, the number of centrifuge blocks is at least two, and the centrifugation drive assembly also includes an elastic reset member connected only to one of the centrifuge blocks.

[0012] Furthermore, an annular plate is provided on the inner wall of the end cover, and a positioning plate is fixedly provided at the end of the annular plate. The positioning plate and the end cover cooperate to form the housing of the speed change mechanism.

[0013] Furthermore, one end of the shaft is connected to the positioning plate, and the other end is connected to the end cap; the ring plate is located outside the centrifugal block and can provide radial positioning for the centrifugal block.

[0014] Furthermore, the inner sidewall of the ring plate is provided with a slot that mates with the positioning plate.

[0015] Furthermore, the transmission mechanism also includes a planetary carrier, a sun gear fixedly mounted on the main shaft, and a ring gear. The planetary carrier is provided with planetary gears that mesh with the sun gear and the ring gear. A first clutch assembly is provided between the planetary carrier and the end cover, and a second clutch assembly is provided between the ring gear and the positioning plate. The centrifugal drive assembly controls the transmission between the ring gear and the positioning plate by restricting or releasing the second clutch assembly.

[0016] Furthermore, the second clutch assembly includes a pawl seat, a pawl, a ratchet, and a spring ring, wherein the pawl seat is fixedly connected to the positioning plate, and the ratchet and the gear ring can move together in the circumferential direction; the centrifugal drive assembly also includes a limiting plate connected to the centrifugal block, and the limiting plate has a release groove that cooperates with the pawl; the limiting plate can press the pawl so that it cannot engage with the ratchet, and after the centrifugal block rotates and swings away, it can drive the limiting plate to rotate so that the pawl is embedded in the release groove and engages with the ratchet.

[0017] Furthermore, the centrifugal block is provided with a swing arm for driving the limiting plate to rotate.

[0018] Furthermore, the centrifugal block is located radially outside the second clutch assembly.

[0019] In summary, the present invention has the following beneficial effects:

[0020] 1. Utilizing output speed to achieve automatic gear shifting can improve the riding experience, reduce the frequency of gear shifting, and extend the service life;

[0021] 2. Considering the influence of raw materials and processing technology, even elastic reset components of the same specifications will inevitably have differences. If multiple elastic reset components are used, it may affect the reset of the limit plate. However, setting only one elastic reset component can avoid the above problems and ensure the smooth reset of the limit plate. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of a hub motor with an integrated speed change mechanism in one embodiment;

[0023] Figure 2 This is an exploded view of a hub motor with an integrated transmission mechanism in one embodiment.

[0024] Figure 3 This is a cross-sectional view of the transmission mechanism in the embodiment;

[0025] Figure 4 This is a schematic diagram of the centrifugal drive component in the embodiment;

[0026] Figure 5 This is a schematic diagram of the ratchet and gear ring in the embodiment.

[0027] In the diagram: 1. Main shaft; 21. Hub; 22. End cover; 31. Planetary carrier; 311. Gear plate; 32. Planetary gear; 33. Sun gear; 34. Gear ring; 341. Second protrusion; 4. First clutch assembly; 51. Pawl seat; 52. Pawl; 53. Ratchet; 531. First protrusion; 6. Positioning plate; 61. Clearance groove; 71. Centrifugal block; 72. Shaft; 73. Torsion spring; 74. Pin; 75. Swing arm; 751. Drive rod; 76. Limiting plate; 761. Release groove; 762. Drive hole; 81. First bearing; 82. Second bearing; 83. Third bearing; 91. Stator and rotor assembly; 92. Reduction assembly. Detailed Implementation

[0028] The present invention will be further described in detail below with reference to the accompanying drawings.

[0029] This specific embodiment is merely an explanation of the present invention and is not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they are within the scope of the claims of the present invention.

[0030] Example:

[0031] A hub motor with an integrated speed-changing mechanism, as shown in the reference Figures 1 to 5 The system includes a main shaft 1, on which a hub 21 and an end cap 22 are connected to each other. The hub 21 and the end cap 22 are connected by screws and are used to output rotational speed. The main shaft 1 is respectively equipped with a mechanism assembly connected to the hub 21 and a gear shifting mechanism connected to the end cap 22. In this embodiment, the gear shifting mechanism can input the pedal speed to drive the end cap 22 and the hub 21 to rotate, thus driving the vehicle forward. The mechanism assembly can input the motor speed to drive the hub 21 and the end cap 22 to rotate, thus assisting the vehicle to move forward. The gear shifting mechanism includes a centrifugal drive assembly, which is connected to the end cap 22 and switches states according to the rotational speed of the end cap 22. In this embodiment, the hub motor changes the state of the centrifugal drive assembly according to the output speed of the hub 21 and the end cap 22, rather than the pedal speed, thereby reducing the shifting frequency of the gear shifting mechanism, extending its service life, and improving the riding experience.

[0032] Reference Figure 1 and Figure 2 In this embodiment, the mechanism assembly includes a stator and rotor assembly 91 and a reduction assembly 92. The rotor speed of the stator and rotor assembly 91 is input to the hub 21 after passing through the reduction assembly 92, forming a geared motor structure. In this embodiment, the reduction assembly 92 is a planetary reduction assembly, which includes a sun gear connected to the rotor, a planetary clutch sleeved on the main shaft 1, and an internal gear ring connected to the hub 21. The planetary clutch is provided with planetary gears that mesh with the sun gear and the internal gear ring. The planetary clutch is prior art and will not be described in detail here.

[0033] Reference Figures 3 to 5The centrifugal drive assembly includes a centrifugal block 71, on which a shaft 72 connected to an end cover 22 passes. The centrifugal block 71 can rotate around the shaft 72. The centrifugal block 71 can switch from a contracted state to an open state according to the rotational speed of the end cover 22. In this embodiment, an annular plate is provided on the inner wall of the end cover 22, and a positioning plate 6 is fixedly provided at the end of the annular plate. The positioning plate 6 and the end cover 22 cooperate to form the housing of the speed change mechanism. One end of the shaft 72 is connected to the positioning plate 6, and the other end is connected to the end cover 22. At the same time, the annular plate is located outside the centrifugal block 71 and can play a radial limiting role on the centrifugal block 71, that is, the centrifugal block 71 cannot continue to rotate after contacting the inner wall of the annular plate. In this embodiment, one end of the shaft 72 is directly connected to the end cover 22, and the inner wall of the end cover 22 extends to form an annular plate. In other optional embodiments, a mounting base can also be fixedly connected to the inner wall of the end cover 22, and the end of the shaft 72 is connected to the mounting base. At the same time, the mounting base radially limits the centrifugal block 71.

[0034] Reference Figure 3 In this embodiment, the positioning plate 6 and the ring plate are connected by screws. At the same time, a groove is provided at the end of the inner side wall of the ring plate to cooperate with the positioning plate 6. The groove can limit the positioning plate 6 axially and radially, thereby ensuring assembly accuracy. In this embodiment, there are two centrifugal blocks 71. The centrifugal drive assembly also includes an elastic reset member connected only to one of the centrifugal blocks 71. In this embodiment, the elastic reset member is a torsion spring 73. The elastic force of the torsion spring 73 makes the centrifugal block 71 tend to reset to the contracted state. Specifically, the torsion spring 73 is sleeved on the shaft 72, one end of which is connected to the centrifugal block 71 and the other end is connected to the positioning plate 6.

[0035] Reference Figures 3 to 5 The transmission mechanism also includes a planetary carrier 31, a sun gear 33 fixedly mounted on the main shaft 1, and a ring gear 34. The planetary carrier 31 is provided with planetary gears 32 that mesh with the sun gear 33 and the ring gear 34. A first clutch assembly 4 is provided between the planetary carrier 31 and the end cover 22, and a second clutch assembly is provided between the ring gear 34 and the positioning plate 6. The centrifugal drive assembly controls the transmission between the ring gear 34 and the positioning plate 6 by restricting or releasing the second clutch assembly. Specifically, in this embodiment, a second bearing 82 is provided between the planetary carrier 31 and the end cover 22, and the ring gear 34 and the end cover 22 are connected. A third bearing 83 is provided between the covers 22, while two first bearings 81 are provided between the main shaft 1 and the planetary carrier 31. The planetary carrier 31 is provided with a gear 311 that is linked to it in the circumferential direction. The rotation of the planetary carrier 31 is driven by the gear 311 to input the pedal speed. In this embodiment, a set of planetary gear assemblies can realize the change of two gears. If more gears are to be changed, multiple sets of planetary gear assemblies can be connected and transmitted. Of course, in other optional embodiments, the planetary gear assembly can be replaced by other structures, which are not limited here.

[0036] ReferenceFigures 3 to 5 The second clutch assembly includes a pawl seat 51, a pawl 52, a ratchet 53, and a spring ring. The pawl seat 51 is fixedly connected to the inner end face of the positioning plate 6, and the ratchet 53 and the gear ring 34 can move together circumferentially. The centrifugal drive assembly also includes a limiting plate 76 connected to the centrifugal block 71. The limiting plate 76 has a release groove 761 that engages with the pawl 52. The limiting plate 76 can press down on the pawl 52, preventing it from engaging with the ratchet 53. When the centrifugal block 71 rotates and swings out, it can drive the limiting plate 76 to rotate, causing the pawl 52 to engage in the release groove 761. Engages with ratchet 53; specifically, when the centrifugal block 71 is in the contracted state, the inner wall of the limiting plate 76 contacts the pawl 52, preventing the engaging end of the pawl 52 from springing up and engaging with the ratchet 53. Thus, the second clutch assembly cannot achieve transmission under the restriction of the centrifugal drive assembly. After the centrifugal block 71 is thrown open, it drives the limiting plate 76 to rotate, causing the release groove 761 to face the pawl 52. Then, the engaging end of the pawl 52 springs up and embeds into the release groove 761, engaging with the ratchet 53. Thus, the second clutch assembly can achieve transmission after being released by the centrifugal drive assembly.

[0037] Reference Figure 3 and Figure 5 In this embodiment, the gear ring 34 includes two inner circumferential sidewalls with different inner diameters. One inner circumferential sidewall is provided with internal teeth that cooperate with the planetary gear 32, and the other inner circumferential sidewall is provided with a plurality of second protrusions 341 evenly distributed. The outer circumferential sidewall of the ratchet 53 is provided with a plurality of first protrusions 531 evenly distributed. The contact between the first protrusions 531 and the second protrusions 341 enables the ratchet 53 and the gear ring 34 to achieve circumferential linkage. The linkage between the ratchet 53 and the gear ring 34 through the first protrusions 531 and the second protrusions 341 can provide buffering during gear shifting and improve the riding experience.

[0038] Reference Figure 3 and Figure 4 In this embodiment, the centrifugal block 71 is radially disposed on the outside of the second clutch assembly, thereby reducing the axial dimension. The centrifugal block 71 is provided with a swing arm 75 for driving the limit plate 76 to rotate. Specifically, the swing arm 75 is provided with a drive rod 751, and the limit plate 76 is provided with a drive hole 762 that cooperates with the drive rod 751. The drive hole 762 is a waist hole. The positioning plate 6 is provided with a clearance groove 61 that cooperates with the swing arm 75, thereby reducing the axial dimension. The centrifugal block 71 and the swing arm 75 are connected by a pin 74, and the position of the pin 74 relative to the centrifugal block 71 and the swing arm 75 in the circumferential direction is fixed. Thus, the centrifugal block 71 can drive the swing arm 75 to deflect through the pin 74. After the swing arm 75 deflects, the drive rod 751 contacts the inner wall of the drive hole 762, driving the limit plate 76 to rotate.

[0039] The working principle is as follows:

[0040] The rotational speed of the pedal power is transmitted to the gear 311, which drives the planet carrier 31 to rotate. The sun gear 33 remains stationary. The planet carrier 31 drives the ring gear 34 to rotate through the planet gears 32, and the rotational speed of the ring gear 34 is greater than that of the planet carrier 31.

[0041] At low speed: When the centrifugal block 71 is in a retracted state, the pawl 52 in the second clutch assembly cannot engage with the ratchet 53 under the restriction of the limiting plate 76, so the rotational speed of the gear ring 34 cannot be transmitted to the end cover 22 through the second clutch assembly; at this time, the planetary carrier 31 drives the end cover 22 to rotate through the first clutch assembly 4 to achieve power output.

[0042] At high speed: After the end cover 22 reaches the shift point, the centrifugal block 71 rotates to the open state under the action of centrifugal force, and drives the limit plate 76 to rotate through the swing arm 75, so that the pawl 52 in the second clutch assembly is opposite to the release groove 761; after the meshing end of the pawl 52 springs up, it is embedded in the release groove 761 and meshes with the ratchet 53. At this time, the second clutch assembly can realize transmission, and the speed of the gear ring 34 is transmitted to the end cover 22 through the second clutch assembly to realize power output; at this time, the speed of the end cover 22 is greater than the speed of the planetary carrier 31, and the first clutch assembly 4 is in the overrunning state.

[0043] Electric power assist: After the wheel hub 21 and end cover 22 are rotated by the pedal power, the core assembly starts to input the speed to the wheel hub 21, assisting the vehicle to move forward and achieving the purpose of saving effort.

[0044] The centrifugal drive assembly is controlled by the end cap 22, which serves as the power output unit. If the rotational speed of the end cap 22 is greater than the shift point, and the rider does not want to pedal, or does not need to pedal while going downhill, the gear mechanism will remain in a high gear. When the rider pedals again, there is no need to change the cadence to shift gears, thereby improving the riding experience. Moreover, the gear position of the gear mechanism will not change during this process, which can reduce the shifting frequency and extend the service life of the gear mechanism.

Claims

1. A hub motor with an integrated speed change mechanism, comprising a main shaft, on which a hub and an end cover are connected to each other, and on which a core assembly connected to the hub and a speed change mechanism connected to the end cover are respectively disposed, wherein the speed change mechanism includes a centrifugal drive assembly; Its features are: The centrifugal drive assembly is connected to the end cap and switches states according to the rotational speed of the end cap; The centrifugal drive assembly includes a centrifugal block with a shaft connected to the end cap passing through it; the centrifugal block can switch from a contracted state to an open state according to the rotational speed of the end cap. The inner end wall of the end cover is provided with an annular plate, and a positioning plate is fixedly provided at the end of the annular plate. The positioning plate and the end cover cooperate to form the housing of the speed change mechanism. One end of the shaft is connected to the positioning plate, and the other end is connected to the end cap; The transmission mechanism further includes a planetary carrier, a sun gear fixedly mounted on the main shaft, and a ring gear. The planetary carrier is provided with planetary gears that mesh with the sun gear and the ring gear. A first clutch assembly is provided between the planetary carrier and the end cover, and a second clutch assembly is provided between the ring gear and the positioning plate. The centrifugal drive assembly controls the transmission between the ring gear and the positioning plate by restricting or releasing the second clutch assembly. The second clutch assembly includes a pawl seat, a pawl, a ratchet, and a spring ring, wherein the pawl seat is fixedly connected to a positioning plate, and the ratchet and the gear ring can move together in the circumferential direction; the centrifugal drive assembly also includes a limiting plate connected to the centrifugal block, and the limiting plate has a release groove that cooperates with the pawl; the limiting plate can press the pawl so that it cannot engage with the ratchet, and after the centrifugal block rotates and swings away, it can drive the limiting plate to rotate so that the pawl is embedded in the release groove and engages with the ratchet.

2. The hub motor with integrated speed-changing mechanism according to claim 1, characterized in that: The number of centrifuge blocks is at least two, and the centrifugation drive assembly also includes a resilient reset member that is connected only to one of the centrifuge blocks.

3. The hub motor with integrated speed-changing mechanism according to claim 1, characterized in that: The ring plate is located outside the centrifuge block and can provide radial positioning for the centrifuge block.

4. The hub motor with integrated speed-changing mechanism according to claim 1, characterized in that: The inner sidewall of the ring plate is provided with a slot that mates with the positioning plate.

5. The hub motor with integrated speed change mechanism according to claim 1, characterized in that: The centrifugal block is equipped with a swing arm for driving the limiting plate to rotate.

6. The hub motor with integrated speed change mechanism according to claim 1, characterized in that: The centrifugal block is located radially outside the second clutch assembly.

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