Continuously variable transmission

Abstract

This utility model discloses a continuously variable transmission (CVT) device, relating to the field of transmission devices. Its key technical features include a main shaft, an output housing rolled on the main shaft, and a ball joint mechanism disposed within the output housing. The device further includes an electronic transmission drive mechanism acting on the ball joint mechanism, the electronic transmission drive mechanism being disposed within the output housing. This utility model, by placing the electronic transmission drive mechanism within the output housing, drives the rotating bracket to rotate. Active gear shifting can be performed via an external control panel, and the device itself can also automatically shift gears, thereby optimizing the riding experience.

Description

Technical Field

[0001] This utility model relates to the field of speed transmission devices, and more specifically, it relates to a continuously variable transmission device. Background Technology

[0002] The existing Chinese patent with authorization announcement number CN102395814B discloses a stator assembly and transmission mechanism for a continuously variable transmission (CVT). The stator assembly includes a first stator, a second stator, a reaction disc, multiple eccentric gears, and a stator driver. The transmission mechanism also includes a housing, which includes a hub and an end cover. The end cover and the hub are connected by a thread, and a planar bearing is provided between the end cover and the stator assembly.

[0003] However, the gear shifting mechanism in the above patent still has the following problems: 1. Manual gear shifting via cable or external electronic gear shifting affects the user experience, and the internal structural design makes it incompatible with electronic gear shifting; 2. The setting of the reaction disc makes the structure complex and inconvenient to install; 3. In order to adjust the preload of the stator assembly, the end cover and the hub are connected by threads. After long-term use, the end cover is prone to loosening, which reduces the sealing between the end cover and the hub, resulting in water ingress or oil leakage. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a continuously variable transmission (CVT) device that enables automatic speed change through an electronic transmission drive mechanism, optimizing the user experience. Furthermore, its reasonable structural layout facilitates assembly. By using a support ring connected to the wheel hub to support the planar bearing, the function of the end cover is simplified, and the connection method between the end cover and the wheel hub is changed, thereby improving the long-lasting sealing performance of the connection between the wheel hub and the end cover.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A continuously variable transmission (CVT) device includes a main shaft, an output housing rolled on the main shaft, and a ball gear shifting mechanism disposed within the output housing. The device further includes an electronic speed shifting drive mechanism acting on the ball gear shifting mechanism, the electronic speed shifting drive mechanism being disposed within the output housing.

[0006] Furthermore, the device also includes an inner housing for supporting the electronic transmission drive mechanism; the inner housing is fixedly sleeved on the main shaft and located inside the output housing.

[0007] Furthermore, an inner cavity is formed between the inner housing and the main shaft, and an outer cavity is formed between the output housing, the main shaft, and the inner housing, with the inner cavity arranged in a sealed manner relative to the outer cavity.

[0008] Furthermore, the ball gear shift mechanism is located in the outer chamber, and the outer chamber is provided with traction oil.

[0009] Furthermore, the electronic transmission drive mechanism includes a drive motor, a drive component, and a transmission assembly disposed between the drive motor and the drive component; The ball speed change mechanism includes a rotating bracket, and the driving component is used to drive the rotating bracket to rotate.

[0010] Furthermore, the driving component includes a first driving gear, and the rotating bracket is provided with a driving tooth groove that cooperates with the first driving gear; Alternatively, the driving component includes an eccentric driving pin, and the rotating bracket is provided with a driving pin groove that cooperates with the eccentric driving pin. Alternatively, the drive component may include a planetary gear shaft, and the rotating support may have a shaft hole that mates with the planetary gear shaft.

[0011] Alternatively, a worm gear structure can be used between the drive component and the rotating support.

[0012] Furthermore, the number of the first drive gear is one, and the drive tooth groove includes an internal drive tooth groove or an external drive tooth groove disposed on the rotating bracket; Alternatively, the number of the first drive gears may be multiple, and the drive tooth groove may include an external drive tooth groove or an internal drive tooth groove disposed on the rotating bracket.

[0013] Furthermore, the first drive gear includes a drive tooth, and the rotating bracket has a clearance hole; the inner wall of the clearance hole has a drive external tooth groove, or the inner wall of the clearance hole has a drive internal tooth groove.

[0014] Furthermore, the driving component also includes a second driving gear connected to the transmission assembly, wherein the first driving gear and the second driving gear are coaxially linked.

[0015] Furthermore, the transmission assembly includes a worm gear assembly with a self-locking function and / or a double planetary gear assembly.

[0016] Furthermore, the electronic transmission drive mechanism also includes an angle detection component; the angle detection component is used to detect the rotation angle of any transmission component among the rotating bracket, drive component, or transmission assembly.

[0017] Furthermore, the outer end face of the inner shell is provided with a positioning ring for supporting the rotating bracket.

[0018] Furthermore, a wire channel is provided inside the main shaft, and an inner opening and an outer opening communicating with the wire channel are respectively opened on the main shaft; the inner opening communicates with the inner cavity, and the outer opening is located on the outside of the output housing.

[0019] Furthermore, the device also includes an external wire passing through the wire channel, and the end of the external wire is provided with a connector located in the inner opening, the connector being recessed or flush with the outer surface of the spindle; The electronic transmission drive mechanism includes a circuit board and a first wire connected to the circuit board; the end of the first wire is provided with a plug that mates with a connector.

[0020] Furthermore, the device also includes a speed measuring component disposed between the fixed bracket of the ball gear mechanism and the output housing; the speed measuring component includes a second wire; the second wire passes through the ball gear mechanism and then enters the inner housing; or, the second wire passes out of the main shaft.

[0021] Furthermore, the continuously variable transmission device also includes an input sleeve extending into the output housing, and a transmission bracket disposed between the input sleeve and the ball gear mechanism; The transmission bracket is located between the inner housing and the output housing; the transmission bracket includes a plate portion extending radially and a ring portion extending axially; a clutch assembly is provided between the plate portion and the input sleeve, and the ring portion is connected to the ball gear mechanism.

[0022] Furthermore, the output housing includes a hub and an end cap connected to the hub; The continuously variable transmission (CVT) also includes a support ring connected to the inner wall of the hub, and a planar bearing is provided between the support ring and the ball gear mechanism.

[0023] Furthermore, the outer wall of the support ring is threadedly connected to the inner wall of the hub; an anti-rotation structure is provided between the end cap and the support ring; or, an anti-rotation structure is provided between the hub and the support ring.

[0024] Furthermore, the anti-rotation structure includes a limiting slot disposed on the end cap and a limiting plug disposed on the support ring; Alternatively, the anti-rotation structure includes a limiting insert disposed on the inner end face of the end cap and a limiting slot disposed on the support ring; Alternatively, the anti-rotation structure may include an anti-rotation screw or retaining ring disposed between the support ring and the hub.

[0025] Furthermore, the ball gear mechanism includes an idler wheel sleeved on the main shaft; the idler wheel includes an integrally formed inner idler wheel ring, two sets of balls, two cages, and two outer idler wheel rings; at least one outer idler wheel ring has a ball mounting groove on its end face.

[0026] In summary, this utility model has the following beneficial effects: 1. The electronic gear drive mechanism is located inside the output housing and is used to drive the rotating bracket to rotate. It can eliminate the reaction disc and can actively adjust the gear through the external control panel. The device itself can also automatically adjust the gear, thereby optimizing the riding experience. 2. The use of a support ring threaded to the wheel hub to support the plane bearing allows for easy adjustment of the preload of the ball gearbox, simplifies the function of the end cover, and changes the connection method between the wheel hub and the end cover, facilitating assembly and improving the long-lasting sealing of the connection between the wheel hub and the end cover.

[0027] 3. Using one drive tooth and one drive tooth groove to match simplifies the structure and helps to improve the structural strength of a single drive tooth; 4. Using a positioning ring to support the rotating bracket can improve the relative positional accuracy between the rotating bracket and the inner housing, thereby improving the fit accuracy between the drive component and the rotating bracket, and improving the accuracy and stability of speed regulation; moreover, the axial extension achieved by the positioning ring can improve the stability of the connection between the inner housing and the main shaft, as well as the stability of the rotating bracket. 6. The use of a speed measuring component can detect the output speed of the output housing, and also facilitates automatic speed adjustment. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the continuously variable transmission (CVT) device in Example 1. Figure 1 ; Figure 2 This is a schematic diagram of the continuously variable transmission (CVT) device in Example 1. Figure 2 ; Figure 3 This is a schematic diagram of the output housing and support ring in Example 1. Figure 1 ; Figure 4 This is a schematic diagram of the end cap structure in Example 1; Figure 5 This is a schematic diagram of the output housing and support ring in Example 1. Figure 2 ; Figure 6 This is a schematic diagram of the hub and support ring in the embodiment; Figure 7 This is a schematic diagram of the transmission bracket in Example 1; Figure 8 This is a schematic diagram of the structure of the driving component and the rotating support in Example 1. Figure 1 ; Figure 9 This is a schematic diagram of the structure of the driving component and the rotating support in Example 1. Figure 2 ; Figure 10 This is a schematic diagram of the structure of the driving component and the rotating support in Example 1. Figure 3 ; Figure 11 This is a schematic diagram of the drive component and the inner housing in Example 1; Figure 12 This is a schematic diagram of the drive component in Example 1; Figure 13 This is a schematic diagram of the electronic transmission drive mechanism in Example 1. Figure 1 ; Figure 14 This is a schematic diagram of the electronic transmission drive mechanism in Example 1. Figure 2 ; Figure 15 This is a schematic diagram of the electronic transmission drive mechanism in Example 1. Figure 3 ; Figure 16 This is a schematic diagram of the speed measuring component and the inner housing in Example 1. Figure 1 ; Figure 17 This is a schematic diagram of the speed measuring component and the fixed bracket in Example 1; Figure 18 This is a schematic diagram of the inner shell structure in Example 1; Figure 19 This is a schematic diagram of the inner shell and the drive component in Example 1; Figure 20 This is a schematic diagram of the idler wheel in Example 1. Figure 1 ; Figure 21 This is a schematic diagram of the idler wheel in Example 1. Figure 2 ; Figure 22 This is a schematic diagram of the drive component and rotating support in Example 2; Figure 23 This is a schematic diagram of the drive component in Example 2; Figure 24 This is a schematic diagram of the rotating bracket and electronic transmission drive mechanism in Example 3. Figure 1 ; Figure 25 This is a schematic diagram of the rotating bracket and electronic transmission drive mechanism in Example 3. Figure 2 ; Figure 26 This is a schematic diagram of the rotating bracket and electronic transmission drive mechanism in Example 3. Figure 3 ; Figure 27 This is a schematic diagram of the planetary gear assembly in Example 3; Figure 28 This is a schematic diagram of the rotating bracket and electronic transmission drive mechanism in Example 4; Figure 29 This is a schematic diagram of the rotating bracket in Example 4.

[0029] In the diagram: 1. Spindle; 11. Wire channel; 13. Outer opening; 12. Inner opening; 21. Hub; 22. End cover; 221. Limiting protrusion; 222. Limiting slot; 3. Ball gear mechanism; 31. Rotary bracket; 311. Clearance hole; 312. Drive gear groove; 313. Wire passage hole; 314. Drive pin groove; 315. Drive hole; 32. Fixed bracket; 33. Input end self-tightening bearing; 34. Output end self-tightening bearing; 35. Idler wheel; 351. Idler wheel inner ring; 352. Ball bearing; 353. Cage; 354. Idler wheel outer ring; 355. Ball bearing mounting groove; 41. Support ring; 411. Limiting plate; 42. Surface bearing; 51. Input sleeve; 52. Transmission bracket; 521. Plate; 522. Ring; 53. Clutch assembly; 6. Inner housing; 61. Positioning ring; 62. Limiting boss; 63. Vent hole; 64. Wire hole; 641 65. First sealing ring groove; 65. Stepped hole; 651. Second sealing ring groove; 66. Planetary shaft movable hole; 71. Drive motor; 72. Circuit board; 73. Fixing plate; 74. Magnet; 751. Worm gear assembly; 752. Reduction gear set; 753. Drive component; 7531. Drive shaft; 7532. Drive gear; 7533. Second drive gear; 7534. Limiting protrusion; 7535. Eccentric drive pin; 76. 1. First sun gear; 762. First double planetary gear; 763. Planetary gear shaft; 764. First driving gear; 765. First external gear ring; 771. Second sun gear; 772. Second double planetary gear; 773. Planet carrier; 774. Second external gear ring; 775. Third external gear ring; 776. Second driving gear; 81. Magnetic ring; 82. Speed ​​sensor; 83. Second wire; 91. External wire; 92. Connector. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings.

[0031] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law. Example 1:

[0032] A continuously variable transmission device, referring to Figures 1 to 22It includes a main shaft 1, an output housing, a ball gear shift mechanism 3, an input sleeve 51, a transmission bracket 52, and an electronic speed change drive mechanism; the input sleeve 51 is rolled on the main shaft 1 by bearings and is used to input torque; one end of the output housing is rolled on the main shaft 1 by bearings, and the other end is rolled on the input sleeve 51 by bearings; the ball gear shift mechanism 3 is sleeved on the main shaft 1 and located inside the output housing; one end of the input sleeve 51 is located outside the output housing, and the other end is located inside the output housing, and the inner end of the input sleeve 51 is connected to the transmission bracket 52 through a clutch assembly 53; the input end of the ball gear shift mechanism 3 is connected to the transmission bracket 52, and the output end is connected to the output housing.

[0033] Reference Figure 1 In this embodiment, the torque transmission path of the device is as follows: input sleeve 51, clutch assembly 53, transmission bracket 52, ball gear mechanism, and output housing. The clutch assembly 53 is set between the input sleeve 51 and the transmission bracket 52 to form a one-way transmission, which can effectively avoid the input of reverse torque and optimize the riding experience. In this embodiment, the clutch assembly 53 is a ratchet and pawl assembly, which can effectively ensure the structural strength and transmission stability. In other optional embodiments, the clutch assembly 53 can also adopt other clutch structures, such as one-way bearings, etc., which are not limited here.

[0034] Reference Figure 1 In this embodiment, the ball gear change mechanism 3 includes a rotating bracket 31, a fixed bracket 32, an input end self-tightening bearing 33, an output end self-tightening bearing 34, and an idler wheel 35. The input end self-tightening bearing 33 is connected to the transmission bracket 52 via a keyway to achieve transmission, and the output end self-tightening bearing 34 is connected to the output housing via a keyway to achieve transmission. The fixed bracket 32 ​​is fixedly sleeved on the main shaft 1, and the rotating bracket 31 can rotate around the main shaft 1 to achieve speed adjustment.

[0035] Reference Figure 1 , Figure 20 as well as Figure 21The idler wheel 35 includes an integrally formed inner idler wheel ring 351, two sets of balls 352, two cages 353, and two outer idler wheel rings 354. At least one outer idler wheel ring 354 has a ball mounting groove 355 on its end face. Specifically, in this embodiment, one of the outer idler wheel rings 354 has a ball mounting groove 355 on its end face. Specifically, the inner idler wheel ring 351 has two symmetrically arranged first annular arc surfaces, and the outer idler wheel ring 354 has a second annular arc surface. The first and second annular arc surfaces form diagonal limiting positions on the balls, preventing them from detaching. This simplifies the structure of the inner idler wheel ring 351, eliminates the need for additional riveting structures to limit the cages 353, and improves the stability of the idler wheel 35. One set of balls 352 is installed first, and then the other set of balls 352 is installed through the ball mounting groove 355. This allows for the assembly of the idler wheel 35 and enables the arrangement of more balls 352, thus improving the stability of the idler wheel.

[0036] Reference Figure 1 In this embodiment, the electronic gear drive mechanism is located inside the output housing and is used to drive the rotating bracket 31 to rotate, thereby realizing automatic gear adjustment. Through the electronic gear drive mechanism, the device can be actively adjusted for gear shifting via an external control panel, and the device itself can also automatically adjust for gear shifting, thereby optimizing the riding experience.

[0037] Reference Figure 1 In this embodiment, the device also includes an inner housing 6 fixedly sleeved on the main shaft 1, and the inner housing 6 is located inside the output housing; wherein, the electronic speed change drive mechanism is disposed in the inner housing 6; that is, the inner housing 6 is used to support the electronic speed change drive mechanism.

[0038] Reference Figures 1 to 7 In this embodiment, the transmission bracket 52 is located between the inner housing 6 and the output housing. The transmission bracket 52 includes a plate portion 521 extending radially and a ring portion 522 extending axially. The ring portion 522 is connected to the input end self-tightening bearing 33 of the ball gear mechanism 3, and the plate portion 521 is connected to the clutch assembly 53. The cross-sections of the plate portion 521 and the ring portion 522 are L-shaped, which can effectively utilize the gap between the output housing and the inner housing 6 for arrangement and avoid interference.

[0039] Reference Figure 1In this embodiment, an inner cavity is formed between the inner side of the inner housing 6 and the main shaft 1, and an outer cavity is formed between the inner side of the output housing, the main shaft 1, and the outer side of the inner housing 6. The inner cavity is sealed relative to the outer cavity. The ball gear mechanism 3 is located in the outer cavity, and traction oil is provided in the outer cavity. Sealing the inner cavity relative to the outer cavity can prevent traction oil from entering the inner cavity and affecting the electronic gear drive mechanism in the inner cavity. In order to improve the sealing performance of the inner cavity, multiple sealing structures are provided between the inner housing 6 and the main shaft 1. The sealing structures include sealing rings, etc. In other optional embodiments, if the electronic gear drive mechanism itself is oil-proof, or other oil-proof methods are used, the inner housing 6 can also be arranged in an open manner, which is not limited here.

[0040] Reference Figures 1 to 6 In this embodiment, the output housing includes a hub 21 and an end cap 22 connected to the hub 21. The end cap 22 and the hub 21 are fixedly connected by multiple screws. Specifically, six screws are evenly distributed around the circumference on the end cap 22, and the end face of the hub 21 has threaded holes that mate with the screws. In this embodiment, the device also includes a plane bearing 42 and a support ring 41 connected to the inner sidewall of the hub 21. The plane bearing 42 is disposed between the input end self-tightening bearing 33 and the support ring 41.

[0041] Reference Figures 1 to 6 Preferably, the outer wall of the support ring 41 is threadedly connected to the inner wall of the hub 21, so that the support ring 41 can be adjusted axially relative to the hub 21. Using the support ring 41 threadedly connected to the hub 21 to support the plane bearing 42 can facilitate the adjustment of the preload of the ball gear mechanism, simplify the function of the end cover 22 and change the connection method between the hub 21 and the end cover 22, facilitate assembly, and improve the long-term sealing of the connection between the hub 21 and the end cover 22 to avoid leakage of traction oil. Reference Figures 1 to 6 Preferably, in this embodiment, an anti-rotation structure is provided between the end cover 22 and the support ring 41; the anti-rotation structure prevents the support ring 41 from rotating, thereby improving the long-term stability of the transmission mechanism; in this embodiment, after the end cover 22 and the hub 21 are axially connected, they are fixedly connected by multiple screws; therefore, the anti-rotation structure is also axially connected.

[0042] Reference Figures 1 to 6 Specifically, in this embodiment, the anti-rotation structure includes a limiting protrusion 221 disposed on the inner end face of the end cover 22, and a limiting slot 222 is formed on the end face of the limiting protrusion 221; a plurality of limiting inserts 411 arranged circumferentially are formed on the end face of the support ring 41 facing the end cover 22; the limiting inserts 411 are axially embedded into the limiting slot 222 to realize the anti-rotation function, so that the support ring 41 cannot rotate relative to the hub 21 or the rotation angle of the support ring 41 is limited.

[0043] Reference Figures 1 to 6 In this embodiment, the relative position of the end cap 22 and the hub 21 along the circumference is fixed, while the circumferential position of the support ring 41 relative to the hub 21 is not fixed, and there is a rotational allowance that meets the design requirements. Considering the machining error, during installation, the support ring 41 is tightened first, then reversed at a small angle, and then the limiting plate 411 closest to the limiting slot 222 is rotated to be opposite to the limiting slot 222, and the end cap 22 can be installed. The number and position of the limiting plates 411 and the number and position of the limiting slots 222 can be adjusted as needed, and are not limited here.

[0044] Reference Figures 1 to 6 In this embodiment, the end cap 22 is subjected to a circumferential force from the limiting insert plate 411. This circumferential force counteracts the screw, thus preventing the end cap 22 from loosening. This improves the sealing between the end cap 22 and the hub 21, preventing leakage of traction oil. In other optional embodiments, the anti-rotation structure can also adopt other structures, which can be connected axially, and are not limited here. In addition, an anti-rotation structure can also be arranged between the support ring and the hub, such as an anti-rotation screw between the support ring and the hub, or a retaining ring that contacts the end face of the support ring is embedded in the inner wall of the hub, and is not limited here.

[0045] Reference Figures 1 to 19 In this embodiment, the electronic transmission drive mechanism includes a drive motor 71, a circuit board 72, a transmission assembly, and a drive component 753. The drive component 753 acts directly on the rotating bracket 31. The transmission assembly is located between the drive motor 71 and the drive component 753. The torque of the drive motor 71 is transmitted to the drive component 753 through the transmission assembly, and then the drive component 753 drives the rotating bracket 31 to rotate. In this embodiment, a fixing plate 73 is also provided inside the inner housing 6. The fixing plate 73 cooperates with the inner housing 6 to support and fix the electronic transmission drive mechanism.

[0046] Reference Figures 1 to 19 In this embodiment, the drive component 753 and the rotating bracket 31 are connected by a gear ring structure, and there is only one drive component 753 in this embodiment. The fact that there is only one drive component 753 in this embodiment reduces the number of openings on the inner housing 6, thereby improving the sealing effect of the inner cavity. Specifically, in this embodiment, the drive component 753 includes a drive shaft 7531 and a first drive gear 7532 located at one end of the drive shaft 7531. The end face of the rotating bracket 31 is provided with a clearance hole 311, and the inner wall of the clearance hole 311 is provided with a drive tooth groove 312 that mates with the drive tooth 713. Figure 9 The drive tooth groove 312 is formed on the inner wall of the relief hole 311 near the radial outer side, and is a drive inner tooth groove; Figure 10 The drive tooth groove 312 is formed on the inner wall of the relief hole 311 near the radial inner side, and serves as the drive tooth groove.

[0047] Reference Figures 1 to 19 When the driving component 753 rotates around the center line of the driving shaft 7531, the first driving gear 7532 applies pressure to the inner wall of the driving tooth groove 312, causing the rotating bracket 31 to rotate around the center line of the main shaft 1, thereby realizing speed regulation. Preferably, in this embodiment, the first driving gear 7532 has only one driving tooth, and the driving tooth groove 312 also has only one groove. In this embodiment, the rotation angle range of the rotating bracket 31 is relatively small, so one driving tooth is sufficient to meet the rotation requirements of the rotating bracket 31. Using one driving tooth not only simplifies the structure, but also improves the structural strength of the driving tooth through size optimization. Specifically, in this embodiment, the end face of the driving shaft 7531 is provided with an extension shaft with a small outer diameter, and the outer wall of the extension shaft is provided with a driving tooth.

[0048] Reference Figures 1 to 19 Compared to directly setting the drive teeth on the outer wall of the drive shaft 7531, this embodiment sets the drive teeth on the extension shaft with a smaller outer diameter, which can optimize the size of the drive teeth, thereby improving the structural strength of the drive teeth and ensuring the long-term stability of the transmission. Of course, in other optional embodiments, multiple drive teeth can also be set on the first drive gear, which is not limited here. In this embodiment, the first drive gear 7532 is inserted into the rotating bracket 31 to realize the transmission connection, which is beneficial to stress concentration and ensures the stability of the transmission. Of course, in other optional embodiments, drive tooth grooves can also be formed by extending the end face of the rotating bracket 31, which is not limited here.

[0049] Reference Figures 1 to 19 In other alternative embodiments, the drive component 753 and the rotating bracket 31 can also use a worm gear structure to achieve transmission, which is not limited here.

[0050] Reference Figures 1 to 19 In this embodiment, the drive member 753 passes through the end wall of the inner housing 6, and the inner housing 6 is provided with a stepped hole 65 that mates with the drive member 753. The stepped hole 65 includes a large inner diameter section and a small inner diameter section. A bearing located in the large inner diameter section is sleeved on the drive shaft 7531, so the drive member 753 is rotatably supported on the inner housing 6. A second sealing ring groove 651 is opened on the inner side wall of the small inner diameter section. A sealing ring that mates with the drive shaft 7531 is embedded in the second sealing ring groove 651, thereby improving the sealing performance of the inner cavity.

[0051] Reference Figures 1 to 19In this embodiment, the first drive gear 7532 is located at the outer end of the drive shaft 7531, and the inner end of the drive shaft 7531 is also provided with a second drive gear 7533 and a limiting protrusion 7534. The second drive gear 7533 and the first drive gear 7532 form a coaxial double gear structure, which can reduce speed and increase torque to ensure the stable rotation of the rotating bracket 31. In this embodiment, the second drive gear 7533 is fan-shaped, which can both ensure the rotation range of the drive component 753 and play a role in avoiding obstacles, thereby effectively optimizing the outer diameter and volume of the inner shell 6. The inner shell 6 is provided with limiting bosses 62 located on both sides of the limiting protrusion 7534, thereby limiting the rotation range of the drive component 753 and ensuring the stability of the speed regulation.

[0052] Reference Figures 1 to 19 In this embodiment, the transmission assembly includes a worm gear assembly 751 and a reduction gear set 752. The worm of the worm gear assembly 751 is connected to the drive motor 71, and the worm wheel is connected to the reduction gear set 752. The reduction gear set 752 is connected to the second drive gear 7533. The worm gear assembly 751, with its self-locking property, ensures the stability of the speed change and also serves as a reversing mechanism, thus facilitating the arrangement of the drive motor 72 within the limited axial space of the inner housing 6. That is, the axis of the drive motor 72 is perpendicular to the centerline of the main shaft 1. In other optional embodiments, the drive motor 72 can also be a disc motor, which is not limited here.

[0053] Reference Figures 1 to 19 In this embodiment, the reduction gear set 752 adopts a multi-stage double gear, which reduces speed and increases torque in multiple stages, thereby providing sufficient driving force for the drive component 753. Preferably, in this embodiment, an angle detection component is provided between the transmission component and the circuit board 72. The angle detection component is used to detect whether the speed change action is effectively executed, thereby realizing closed-loop control of the speed change. Specifically, the angle detection component includes a magnet 74 and a sensor disposed on the circuit board 72. The magnet 74 is fixed to the end of the gear shaft of one of the double gears. When the double gear rotates, it drives the magnet 74 to rotate. The sensor can detect the angle of rotation of the magnet 74, thereby determining whether the speed change action is executed. The double gear meshes with the second drive gear 7533 and is located at the end of the transmission component, thereby improving the accuracy of detection. In other optional embodiments, the angle detection component can also be used to detect the rotation angle of the transmission component or the rotating bracket, which is not limited here. For example, the angle detection component can be arranged on the rotating bracket and the inner shell respectively.

[0054] Reference Figures 1 to 19 In other alternative embodiments, other transmission structures may be used for the transmission components, which are not limited here; in order to provide sufficient driving force, the number of drive motors may be increased, for example, two drive motors may be used, which are not limited here.

[0055] Reference Figure 1 Preferably, a positioning ring 61 is provided on the outer side wall of the inner housing 6, and the rotating bracket 31 is rolled on the positioning ring 61. Specifically, a bearing is provided between the rotating bracket 31 and the positioning ring 61. Rolling the rotating bracket 31 on the positioning ring 61 can improve the relative positional accuracy between the rotating bracket 31 and the inner housing 6, thereby improving the fitting accuracy between the drive component and the rotating bracket 31, and improving the accuracy and stability of speed regulation. Moreover, using the positioning ring 61 can increase the axial engagement length between the inner housing 6 and the main shaft 1, thereby improving the stability of the inner housing 6. Furthermore, it can also increase the axial length of the inner hole of the rotating bracket 31, thereby improving the stability of the rotating bracket 31. In other optional embodiments, the rotating bracket 31 can also be directly sleeved on the positioning ring 61, which is not limited here.

[0056] Reference Figure 1 In this embodiment, a wire channel 11 is provided inside the spindle 1, and an inner opening 12 and an outer opening 13 communicating with the wire channel 11 are respectively opened on the spindle 1; the inner opening 12 communicates with the inner cavity, and the outer opening 13 is located outside the output housing; the device also includes an external wire 91 passing through the wire channel 11, and the end of the external wire 91 is injection molded with a connector 92 located in the inner opening 12; the circuit board 72 is connected to a first wire, and the end of the first wire is provided with a plug that mates with the connector 92.

[0057] Reference Figure 1 The external wire 91 is connected to the first wire through a connector 92 and a plug. The connector 92 is recessed or flush with the outer surface of the spindle 1, which facilitates assembly, avoids interference, and improves production efficiency. Preferably, a sealing structure is provided between the external wire 91 and the external opening 13 and the wire channel 11 to improve the sealing effect of the inner cavity.

[0058] Reference Figures 1 to 19 Preferably, in this embodiment, a speed measuring component is provided between the fixed bracket 32 ​​and the hub 21 of the ball gear mechanism 3; the speed measuring component includes a magnetic ring 81 fixedly disposed on the inner end face of the hub 21, a speed sensor 82 fixedly disposed on the end face of the fixed bracket 32, and a second wire 83 connected to the speed sensor 82; the hub 21 drives the magnetic ring 81 to rotate, while the speed sensor 82 remains fixed, thereby enabling the detection of the output speed of the output housing and facilitating automatic gear adjustment.

[0059] Reference Figures 1 to 19The second wire 83 passes through the ball gear mechanism 3 and then into the inner housing 6, connecting to the circuit board 72. A wire hole 313 for the second wire 83 to pass through is provided on the rotating bracket 31. The wire hole 313 is oblong, serving to allow space. A wire hole 64 that mates with the second wire 83 is provided on the end wall of the inner housing 6. A first sealing ring groove 641 is provided on the inner side wall of the wire hole 64. A sealing ring that contacts the second wire 83 is embedded in the first sealing ring groove 641, thereby improving the sealing effect of the inner cavity. Inserting the second wire 83 into the inner housing 6 and connecting it to the circuit board 72 avoids the need for a separate hole on the spindle. Of course, in other optional embodiments, the second wire can also be directly inserted into the wire channel 11, which is not limited here.

[0060] Reference Figures 1 to 19 In this embodiment, the continuously variable transmission (CVT) can be installed as a separate transmission device on the rear wheel of the bicycle, or it can be integrated with the hub motor or the mid-drive motor. No restrictions are placed here. Example 2:

[0061] A continuously variable transmission device, referring to Figures 1 to 23 Based on Embodiment 1, the difference between this embodiment and Embodiment 1 is that: in this embodiment, the driving component includes an eccentric driving pin 7535 disposed on the end face of the driving shaft 7531, and the rotating bracket 31 is provided with a driving pin groove 314 that cooperates with the eccentric driving pin 7535; the eccentric driving pin 7535 deflects around the center line of the driving shaft 7531, thereby driving the rotating bracket 31 to rotate and realize speed regulation. Example 3:

[0062] A continuously variable transmission device, referring to Figures 1 to 27 Based on Embodiment 1, the difference between this embodiment and Embodiment 1 is that: in this embodiment, the transmission component includes a planetary gear assembly arranged between the rotating support 31 and the inner housing 6, and a first drive gear 763; wherein, the rotating support 31 rotates as a planetary carrier.

[0063] Reference Figures 1 to 27 In this embodiment, the first driving gear 763 is equivalent to the driving component in Embodiment 1. That is, in this embodiment, a planetary gear assembly is added on the basis of Embodiment 1. This can further improve the stability of the transmission and ensure the smooth rotation of the rotating bracket 31, thereby realizing speed regulation. Moreover, the planetary gear assembly further realizes speed reduction and torque increase, so as to smoothly drive the rotation of the rotating bracket 31 and reduce the performance requirements of the drive motor. In other optional embodiments, the torque of the drive motor can be directly transmitted to the first sun gear, or other transmission structures can be used between the drive motor and the first sun gear. The drive motor can also be a disc motor, which is not limited here.

[0064] Reference Figures 24 to 27 In this embodiment, the planetary gear assembly includes a first sun gear 761, a plurality of first double planetary gears 762, a planetary gear shaft 763 passing through the first double planetary gears 762, and a first external gear ring 764 fixedly disposed on the outer side wall of the inner housing 6; the pinion of the first double planetary gear 762 meshes with the first external gear ring 764, and the large gear of the first double planetary gear 762 meshes with the first sun gear 761; the rotating bracket 31 has a shaft hole that mates with the planetary gear shaft 763, and the outer end face of the inner housing 6 has a planetary shaft movable hole 66 that mates with the planetary gear shaft 763.

[0065] Reference Figures 24 to 27 The first driving gear 765 drives the first sun gear 761 to rotate, while the first external gear ring 764 remains fixed. The first double planetary gear 762 drives the rotating support 31 to rotate through the planetary gear shaft 763, thereby achieving speed regulation. Therefore, in this embodiment, the planetary gear shaft 763 serves as the driving component that drives the rotating support 31 to rotate. Example 4:

[0066] A continuously variable transmission device, referring to Figures 1 to 29 Based on Embodiment 3, the difference between this embodiment and Embodiment 3 is that: in this embodiment, the planetary gear assembly includes a second sun gear 771, a second double planetary gear 772, a planet carrier 773, a second external gear ring 774, and a third external gear ring 775; wherein, the second external gear ring 774 is fixedly connected to the inner housing 6, and the third external gear ring 775 is fixedly connected to the rotating support 31 or integrally formed, so the rotating support 31 rotates as an external gear ring; of course, in other optional embodiments, the rotating support can also rotate as a sun gear, which is not limited here.

[0067] Reference Figure 28 and Figure 29 One gear of the second double planetary gear 772 meshes with the second external gear ring 774, and the other gear meshes with the third external gear ring 775; one end of the second double planetary gear 772 is connected to the planet carrier 773, and the other end is spaced apart from the end face of the inner housing 6.

[0068] Reference Figure 29 and Figure 29 The second drive gear 776 receives the torque from the drive motor and drives the second sun gear 771 to rotate; the second external gear ring 774 is fixed, so the second double planetary gear 772 drives the third external gear ring 775 to rotate, which in turn drives the rotating bracket 31 to rotate, thereby realizing speed regulation; the rotating bracket 31 and the third external gear ring 775 are integrally formed, so in this embodiment, the second double planetary gear 772 serves as the driving component that drives the rotating bracket 31 to rotate.

[0069] Reference Figure 28 and Figure 29 In this embodiment, the planetary gear assembly is a double planetary gear assembly. It utilizes the input of the second sun gear 771 and the output of the third external gear ring 775 to achieve a self-locking function, thereby improving the stability of the speed regulation.

Claims

1. A continuously variable transmission (CVT) device, comprising a main shaft, an output housing rolled on the main shaft, and a ball gear mechanism disposed within the output housing, characterized in that: The device also includes an electronic speed change drive mechanism that acts on the ball speed change mechanism, and the electronic speed change drive mechanism is disposed in the output housing.

2. The continuously variable transmission device according to claim 1, characterized in that: The device also includes an inner housing for supporting the electronic transmission drive mechanism; the inner housing is fixedly sleeved on the main shaft and located inside the output housing.

3. The continuously variable transmission device according to claim 2, characterized in that: An inner cavity is formed between the inner housing and the main shaft, and an outer cavity is formed between the output housing, the main shaft, and the inner housing. The inner cavity is arranged in a sealed manner relative to the outer cavity.

4. The continuously variable transmission device according to claim 3, characterized in that: The ball speed change mechanism is located in the outer chamber, which is filled with traction oil.

5. The continuously variable transmission device according to claim 2, characterized in that: The electronic transmission drive mechanism includes a drive motor, a drive component, and a transmission assembly disposed between the drive motor and the drive component. The ball speed change mechanism includes a rotating bracket, and the driving component is used to drive the rotating bracket to rotate.

6. The continuously variable transmission device according to claim 5, characterized in that: The driving component includes a first driving gear, and the rotating bracket is provided with a driving tooth groove that cooperates with the first driving gear. Alternatively, the driving component includes an eccentric driving pin, and the rotating bracket is provided with a driving pin groove that cooperates with the eccentric driving pin. Alternatively, the driving component includes a planetary gear shaft, and the rotating support is provided with a shaft hole that mates with the planetary gear shaft; Alternatively, a worm gear structure can be used between the drive component and the rotating support.

7. The continuously variable transmission device according to claim 6, characterized in that: The number of the first drive gear is one, and the drive tooth groove includes an internal drive tooth groove or an external drive tooth groove disposed on the rotating bracket; Alternatively, the number of the first drive gears may be multiple, and the drive tooth groove may include an external drive tooth groove or an internal drive tooth groove disposed on the rotating bracket.

8. The continuously variable transmission device according to claim 7, characterized in that: The first drive gear includes a drive tooth, and the rotating bracket has a clearance hole; the inner sidewall of the clearance hole has a drive external tooth groove, or the inner sidewall of the clearance hole has a drive internal tooth groove.

9. The continuously variable transmission device according to claim 6, characterized in that: The driving component further includes a second driving gear connected to the transmission assembly, wherein the first driving gear and the second driving gear are coaxially linked.

10. The continuously variable transmission device according to claim 5, characterized in that: The transmission assembly includes a worm gear assembly with self-locking function and / or a double planetary gear assembly.

11. The continuously variable transmission device according to claim 5, characterized in that: The electronic transmission drive mechanism also includes an angle detection component; the angle detection component is used to detect the rotation angle of any of the transmission components, such as the rotating bracket, the drive component, or the transmission assembly.

12. The continuously variable transmission device according to claim 5, characterized in that: The outer end face of the inner shell is provided with a positioning ring for supporting the rotating bracket.

13. The continuously variable transmission device according to claim 3, characterized in that: The main shaft is provided with a wire channel, and the main shaft is provided with an inner opening and an outer opening that communicate with the wire channel; the inner opening communicates with the inner cavity, and the outer opening is located on the outside of the output housing.

14. The continuously variable transmission device according to claim 13, characterized in that: The device also includes an external wire passing through the wire channel, and the end of the external wire is provided with a connector located in the inner opening, the connector being recessed or flush with the outer surface of the spindle. The electronic transmission drive mechanism also includes a circuit board and a first wire connected to the circuit board; the end of the first wire is provided with a plug that mates with a connector.

15. The continuously variable transmission device according to claim 2, characterized in that: The device further includes a speed measuring component disposed between the fixed bracket of the ball gear mechanism and the output housing; the speed measuring component includes a second wire, which passes through the ball gear mechanism and then into the inner housing.

16. The continuously variable transmission device according to claim 1, characterized in that: The output housing includes a hub and an end cap connected to the hub; The device also includes a support ring connected to the inner wall of the hub, and a planar bearing is provided between the support ring and the ball gear mechanism.

17. The continuously variable transmission (CVT) device according to claim 16, characterized in that: The outer wall of the support ring is threaded to the inner wall of the hub; an anti-rotation structure is provided between the end cap and the support ring; or, an anti-rotation structure is provided between the hub and the support ring.

18. The continuously variable transmission (CVT) device according to claim 17, characterized in that: The anti-rotation structure includes a limiting slot disposed on the end cap and a limiting plug disposed on the support ring; Alternatively, the anti-rotation structure includes a limiting insert disposed on the inner end face of the end cap and a limiting slot disposed on the support ring; Alternatively, the anti-rotation structure may include an anti-rotation screw or retaining ring disposed between the support ring and the hub.

19. The continuously variable transmission device according to claim 1, characterized in that: The ball gear mechanism includes an idler wheel sleeved on the main shaft; the idler wheel includes an integrally formed inner idler wheel ring, two sets of balls, two cages, and two outer idler wheel rings; at least one outer idler wheel ring has a ball mounting groove on its end face.

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