Electric gear shifting driving mechanism and speed change device

Abstract

The utility model discloses an electric gear shifting driving mechanism and a speed change device, and relates to the field of speed change devices. According to the technical scheme, the device comprises an electric driving assembly, a flexible transmission assembly, a first angle detection assembly and a second angle detection assembly; the flexible transmission assembly comprises a first transmission rotating sleeve, a second transmission rotating sleeve and a transmission torsional spring arranged between the first transmission rotating sleeve and the second transmission rotating sleeve. The first angle detection assembly is used for detecting the angle of the first transmission rotating sleeve, and the second angle detection assembly is used for detecting the angle of the second transmission rotating sleeve. The gear shifting smoothness and accuracy can be improved, the damage risk of the electric drive assembly is reduced, whether gear shifting is accurate or not can be fed back, closed-loop control is achieved, one-time multi-gear switching is facilitated, intelligent automatic gear shifting is achieved, and user experience is optimized.

Description

Technical Field

[0001] The utility model relates to the field of speed change devices, and more specifically, to an electric gear shift drive mechanism and a speed change device. Background Art

[0002] In a speed change mechanism of a bicycle, multiple pawls are usually used to achieve gear switching.

[0003] The existing Chinese patent with authorization announcement number CN221477422U discloses a hub motor with an integrated speed change mechanism, which includes a shift adjustment assembly, which includes a plurality of pawls respectively embedded in the central shaft and a shift sleeve sleeve mounted on the central shaft, and the shift sleeve is used to control the pawls to pop up or retract; the shift adjustment assembly also includes a drive sleeve connected to the shift sleeve, and a cable plate mounted on the drive sleeve, and a flexible connection is achieved between the cable plate and the drive sleeve through an elastic member.

[0004] However, the above patent uses a cable to control the rotation of the cable plate to achieve gear shifting, which is complicated to install and adjust, and the gear shifting can only be done manually. Utility Model Content

[0005] In response to the shortcomings of the existing technology, one of the purposes of the present invention is to provide an electric gear shifting mechanism, which can improve the smoothness and accuracy of gear shifting, reduce the risk of damage to the electric drive components, provide feedback on whether the gear shift is accurate, realize closed-loop control, and facilitate multi-gear switching at one time and realize intelligent automatic gear shifting, thereby optimizing the user experience.

[0006] To achieve the above objectives, the present invention provides the following technical solutions:

[0007] An electric gear shift drive mechanism, comprising:

[0008] spindle;

[0009] A gear shift sleeve mounted on the main shaft;

[0010] A flexible transmission assembly, comprising a first transmission sleeve, a second transmission sleeve, and a transmission torsion spring disposed between the first transmission sleeve and the second transmission sleeve, wherein the second transmission sleeve and the shift sleeve are linked in a circumferential direction; and

[0011] an electric drive assembly acting on the first transmission sleeve;

[0012] The electric drive assembly drives the first transmission sleeve to rotate forward or reverse, and then drives the second transmission sleeve and the shift sleeve to rotate forward or reverse through the transmission torsion spring.

[0013] Furthermore, the outer side wall of the second transmission sleeve is provided with an annular cavity, and the two opposite inner side walls of the annular cavity are respectively provided with a first arc groove and a second arc groove;

[0014] The transmission torsion spring is arranged in the annular cavity, and the two ends of the transmission torsion spring are respectively provided with a first blocking rod extending into the first arc groove and a second blocking rod extending into the second arc groove;

[0015] The inner side wall of the first transmission sleeve is respectively provided with a first boss cooperating with the first gear lever and a second boss cooperating with the second gear lever;

[0016] When the first transmission sleeve rotates forward, the first boss drives the first blocking rod to rotate, and the second blocking rod contacts the inner end surface of the second arc groove under the action of elastic force, and drives the second transmission sleeve to rotate forward;

[0017] When the first transmission sleeve is reversed, the second boss drives the second shift lever to rotate, and the first shift lever contacts the inner end surface of the first arc groove under the action of elastic force, and drives the second transmission sleeve to reverse.

[0018] Furthermore, the electric gear shift drive mechanism further includes a first angle detection component cooperating with the first transmission sleeve, and a second angle detection component cooperating with the second transmission sleeve.

[0019] Furthermore, a fixing bracket is provided on the main shaft, and a first rotating shaft and a second rotating shaft are respectively provided on the fixing bracket; a first transmission gear is provided on the outer side wall of the first transmission rotating sleeve, and a first driven gear meshing with the first transmission gear is provided on the first rotating shaft; a second transmission gear is extended from the outer end surface of the second transmission rotating sleeve, and a second driven gear meshing with the second transmission gear is provided on the second rotating shaft;

[0020] A circuit board is also provided on the fixed bracket; the first angle detection component includes a first Hall provided on the circuit board, and a first magnet provided on the first rotating shaft; the second angle detection component includes a second Hall provided on the circuit board, and a second magnet provided on the second rotating shaft.

[0021] Furthermore, the electric drive assembly is arranged on the fixed bracket, and the electric drive assembly includes a driving gear meshing with the first transmission gear.

[0022] Furthermore, the electric drive assembly also includes a motor and a worm gear assembly arranged between the motor and the drive gear.

[0023] Furthermore, a casing cooperating with the electric drive assembly is provided on the fixing bracket.

[0024] Furthermore, a bearing is provided between the second transmission sleeve and the main shaft; a limit plate is provided on the inner side wall of the second transmission sleeve, and a limit slot cooperating with the limit plate is provided on the end face of the shift sleeve.

[0025] Another object of the present invention is to provide a speed change device, which includes the above-mentioned electric gear shift drive mechanism.

[0026] Furthermore, the speed change device includes a housing, and the electric gear shift drive mechanism is arranged on the inner side of the housing.

[0027] In summary, the present invention has the following beneficial effects:

[0028] 1. The flexible transmission component can achieve two-way flexible transmission, which can improve the smoothness of gear shifting and reduce the risk of damage to the electric drive components;

[0029] 2. The electric drive component, flexible transmission component, first angle detection component and second angle detection component work together to provide feedback on whether the gear shift is accurate, achieve closed-loop control, and facilitate multi-gear switching and intelligent automatic gear shifting, thereby optimizing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 The structure of the electric shift drive mechanism in Example 1 is shown as follows: Figure 1 ;

[0031] Figure 2 The structure of the electric shift drive mechanism in Example 1 is shown as follows: Figure 2 ;

[0032] Figure 3 The structure of the electric shift drive mechanism in Example 1 is shown as follows: Figure 3 ;

[0033] Figure 4 The structure of the flexible transmission component in Example 1 is shown as follows: Figure 1 ;

[0034] Figure 5 The structure of the flexible transmission component in Example 1 is shown as follows: Figure 2 ;

[0035] Figure 6 The structure of the flexible transmission component in Example 1 is shown as follows: Figure 3 ;

[0036] Figure 7 The structure of the flexible transmission component in Example 1 is shown as follows: Figure 4 .

[0037] In the figure: 1. Main shaft; 2. Ratchet; 3. Shift sleeve; 41. First transmission sleeve; 411. First boss; 412. Second boss; 413. First transmission gear; 42. Second transmission sleeve; 421. First arc groove; 422. Second arc groove; 43. Transmission torsion spring; 431. First gear lever; 432. Second gear lever; 44. Second transmission gear; 51. Fixed bracket; 52. Electric drive assembly; 521. Drive gear; 53. Circuit board; 531. First Hall; 532. Second Hall; 541. First rotating shaft; 542. First driven gear; 543. First magnet; 551. Second rotating shaft; 552. Second driven gear; 553. Second magnet. DETAILED DESCRIPTION

[0038] The present invention will be described in further detail below with reference to the accompanying drawings.

[0039] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law. Example 1:

[0040] An electric gear shift drive mechanism, referring to Figures 1 to 7 It includes a main shaft 1, a pawl 2, a shift sleeve 3, a flexible transmission component, a fixed bracket 51, an electric drive component 52, a first angle detection component and a second angle detection component; wherein, a plurality of pawls 2 are provided on the main shaft 1, and the shift sleeve 3 is used to control the opening or closing of the pawl 2 to realize the gear switching.

[0041] Reference Figures 1 to 7 In this embodiment, the flexible transmission assembly includes a first transmission sleeve 41, a second transmission sleeve 42 and a transmission torsion spring 43 arranged between the first transmission sleeve 41 and the second transmission sleeve 42; a bearing is provided between the second transmission sleeve 42 and the main shaft 1, and the second transmission sleeve 42 and the shift sleeve 3 are linked in the circumferential direction; specifically, a limit plate is provided on the inner side wall of the second transmission sleeve 42, and a limit slot cooperating with the limit plate is provided on the end face of the shift sleeve 3; the limit plate is axially embedded in the limit slot to realize the circumferential linkage between the second transmission sleeve 42 and the shift sleeve 3, and facilitate assembly; then, the second transmission sleeve 42 drives the shift sleeve 3 to rotate.

[0042] Reference Figures 1 to 7The outer wall of the second transmission sleeve 42 is provided with an annular cavity, the first transmission sleeve 41 is sleeved on the second transmission sleeve 42, and the inner wall of the first transmission sleeve 41 is provided with a limiting convex ring embedded in the annular cavity; wherein the first transmission sleeve 41 can rotate relative to the second transmission sleeve 42, and the limiting convex ring can realize axial limitation between the first transmission sleeve 41 and the second transmission sleeve 42; the two opposite inner walls of the annular cavity are respectively provided with a first arc groove 421 and a second arc groove 422; the transmission torsion spring 43 is provided in the annular cavity, and the two ends of the transmission torsion spring 43 are respectively provided with a first stop rod 431 extending into the first arc groove 421, and a second stop rod 432 extending into the second arc groove 422; the inner wall of the first transmission sleeve 41 is respectively provided with a first boss 411 cooperating with the first stop rod 431, and a second boss 412 cooperating with the second stop rod 432.

[0043] Reference Figures 1 to 7 , the first transmission sleeve 41 rotates forward ( Figure 6 In the clockwise direction), the first boss 411 drives the first gear lever to rotate, and the second gear lever 432 contacts the inner end surface of the second arc groove 422 under the action of elastic force, and drives the second transmission rotating sleeve 42 to rotate forward, and the second transmission rotating sleeve 42 drives the shift rotating sleeve 3 to rotate forward; the first transmission rotating sleeve 41 is reversed ( Figure 6 When the gear shift is turned counterclockwise, the second boss 412 drives the second gear rod 432 to rotate, and the first gear rod 431 contacts the inner end surface of the first arc groove 421 under the action of elastic force, and drives the second transmission sleeve 42 to reverse, and the second transmission sleeve 42 drives the shift sleeve 3 to reverse; in this embodiment, the transmission torsion spring 43 is in a pre-stressed state during installation, and there is a pre-stressed elastic force, so that the first gear rod 431 and the second gear rod 432 can be in a conflicting state respectively, and then can follow the rotation in time to ensure the accuracy of the gear position.

[0044] Reference Figures 1 to 7 The flexible transmission component in this embodiment can realize bidirectional flexible transmission, which can improve the smoothness of gear shifting and reduce the risk of damage to the electric drive component.

[0045] Reference Figures 1 to 7In this embodiment, the fixed bracket 51 is installed on the main shaft 1, and the two are connected by a keyway assembly, so that the fixed bracket 51 is fixed relative to the main shaft 1; a housing for installing the electric drive assembly 52 is provided on the fixed bracket 51, thereby facilitating the installation of the electric drive assembly 52; in this embodiment, the electric drive assembly includes a motor, a driving gear 521 and a worm gear assembly arranged between the motor and the driving gear 521; the outer wall of the first transmission sleeve 41 is provided with a first transmission gear 413, and the first transmission gear 413 is engaged with the driving gear 521; that is, the electric drive assembly 52 drives the first transmission sleeve 41 to rotate through the driving gear 521 and the first transmission gear 413; utilizing the self-locking property of the worm gear assembly, when the motor stops rotating, the gear position can be locked to ensure the accuracy of the gear position.

[0046] Reference Figures 1 to 7 Preferably, in this embodiment, a first angle detection component is used to detect the angle of the first transmission sleeve 41, and a second angle detection component is used to detect the angle of the second transmission sleeve 42. The first angle detection component cooperates with the second angle detection component to realize closed-loop control, which can not only identify whether the gear switching is realized, but also facilitate the realization of intelligent automatic gear shifting.

[0047] Reference Figures 1 to 7 Specifically, a first rotating shaft 541 and a second rotating shaft 551 are respectively provided on the fixed bracket 51; a bearing is provided between the first rotating shaft 541 and the fixed bracket 51, and a bearing is provided between the second rotating shaft 551 and the fixed bracket 51; one end of the first rotating shaft 541 is provided with a first driven gear 542 meshing with the first transmission gear 413, and the other end is provided with a first magnetic steel 543; the outer end surface of the second transmission sleeve 42 is extended with a second transmission gear 44; one end of the second rotating shaft 551 is provided with a second driven gear 552 meshing with the second transmission gear 44, and the other end is provided with a second magnetic steel 553; a circuit board 53 is also provided on the fixed bracket 51, and a first Hall 531 opposite to the first magnetic steel 543 and a second Hall 532 opposite to the second magnetic steel 553 are respectively provided on the circuit board 53; that is, the first angle detection component includes the first Hall 531 and the first magnetic steel 543, and the second angle detection component includes the second Hall 532 and the second magnetic steel 553.

[0048] Reference Figures 1 to 7, the driving gear 521, the first transmission gear 413, the first driven gear 542, the first rotating shaft 541 and the first magnetic steel 543 rotate synchronously, and the first Hall 531 detects the angle of the first magnetic steel 543, thereby being able to feedback the gear position to be adjusted; the shift sleeve 3, the second transmission sleeve 42, the second transmission gear 44, the second driven gear 552, the second rotating shaft 551 and the second magnetic steel 553 rotate synchronously, and the second Hall 532 detects the angle of the second magnetic steel 553, thereby being able to feedback the actual gear position; the first transmission sleeve 41 and the second transmission sleeve 42 are flexibly transmitted through the transmission torsion spring 43, and there is a hysteresis in the transmission, so the first angle detection component cooperates with the second angle detection component to realize closed-loop control, thereby feedback whether accurate gear shifting is achieved.

[0049] Reference Figures 1 to 7 Moreover, in this embodiment, the flexible transmission component, the first angle detection component and the second angle detection component are used in combination, which is conducive to realizing multi-gear switching at one time and optimizing the user experience; for example, directly switching from the first gear to the third gear without first switching from the first gear to the second gear and then switching from the second gear to the third gear; moreover, the electric drive component 52, the first angle detection component and the second angle detection component are used in combination, which is conducive to realizing intelligent automatic gear shifting without the rider having to perform gear shifting operations, thereby optimizing the user experience. Example 2:

[0050] A speed change device, referring to Figures 1 to 7 The speed shifting device in this embodiment includes the electric shifting drive mechanism and the housing in Example 1, and the electric shifting drive mechanism is arranged on the inner side of the housing, which not only protects the electric shifting drive mechanism but also makes it more beautiful. The speed shifting device in this embodiment can be used as an independent speed shifting device, such as a speed hub, or can be integrated into a hub motor, which is not limited here.

Claims

1. An electric gear shift drive mechanism, characterized in that: include: spindle; A gear shift sleeve mounted on the main shaft; A flexible transmission assembly, comprising a first transmission sleeve, a second transmission sleeve, and a transmission torsion spring disposed between the first transmission sleeve and the second transmission sleeve, wherein the second transmission sleeve and the shift sleeve are linked in a circumferential direction; and an electric drive assembly acting on the first transmission sleeve; The electric drive assembly drives the first transmission sleeve to rotate forward or reverse, and then drives the second transmission sleeve and the shift sleeve to rotate forward or reverse through the transmission torsion spring.

2. The electric shift drive mechanism according to claim 1, characterized in that: The outer side wall of the second transmission sleeve is provided with an annular cavity, and the two opposite inner side walls of the annular cavity are respectively provided with a first arc groove and a second arc groove; The transmission torsion spring is arranged in the annular cavity, and the two ends of the transmission torsion spring are respectively provided with a first blocking rod extending into the first arc groove and a second blocking rod extending into the second arc groove; The inner side wall of the first transmission sleeve is respectively provided with a first boss cooperating with the first gear lever and a second boss cooperating with the second gear lever; When the first transmission sleeve rotates forward, the first boss drives the first blocking rod to rotate, and the second blocking rod contacts the inner end surface of the second arc groove under the action of elastic force, and drives the second transmission sleeve to rotate forward; When the first transmission sleeve is reversed, the second boss drives the second shift lever to rotate, and the first shift lever contacts the inner end surface of the first arc groove under the action of elastic force, and drives the second transmission sleeve to reverse.

3. The electric shift drive mechanism according to claim 1, characterized in that: The electric gear shift drive mechanism further includes a first angle detection component that cooperates with the first transmission sleeve, and a second angle detection component that cooperates with the second transmission sleeve.

4. The electric shift drive mechanism according to claim 3, characterized in that: The main shaft is provided with a fixed bracket, and the fixed bracket is respectively provided with a first rotating shaft and a second rotating shaft; the outer wall of the first transmission rotating sleeve is provided with a first transmission gear, and the first rotating shaft is provided with a first driven gear meshing with the first transmission gear; the outer end surface of the second transmission rotating sleeve is extended to provide a second transmission gear, and the second rotating shaft is provided with a second driven gear meshing with the second transmission gear; A circuit board is also provided on the fixed bracket; the first angle detection component includes a first Hall provided on the circuit board, and a first magnet provided on the first rotating shaft; the second angle detection component includes a second Hall provided on the circuit board, and a second magnet provided on the second rotating shaft.

5. The electric shift drive mechanism according to claim 4, characterized in that: The electric drive assembly is arranged on the fixed bracket, and the electric drive assembly includes a driving gear meshing with the first transmission gear.

6. The electric shift drive mechanism according to claim 5, characterized in that: The electric drive assembly further includes a motor and a worm gear assembly arranged between the motor and the drive gear.

7. The electric shift drive mechanism according to claim 5, characterized in that: The fixing bracket is provided with a sleeve shell that matches the electric drive component.

8. The electric shift drive mechanism according to claim 1, characterized in that: A bearing is provided between the second transmission sleeve and the main shaft; a limit plate is provided on the inner side wall of the second transmission sleeve, and a limit slot cooperating with the limit plate is provided on the end face of the shift sleeve.

9. A speed change device, characterized in that: The electric gear shift drive mechanism comprises the electric gear shift drive mechanism according to any one of claims 1 to 8.

10. The speed change device according to claim 9, characterized in that: The speed change device includes a housing, and the electric gear shift drive mechanism is arranged on the inner side of the housing.

Images