Rear electronic transmission

Abstract

The utility model discloses a rear electronic transmission which comprises a rear derailleur and a power supply, and the power supply supplies power to the rear derailleur. The rear derailleur comprises a shell, a driving unit, a transmission unit, an output unit, an induction piece and a circuit board. Wherein an accommodating cavity is formed in the shell; the driving unit is arranged in the accommodating cavity; the transmission unit is arranged in the accommodating cavity and comprises a first gear set, a second gear set and a magnetic gear set which are sequentially meshed, and the first gear set is in transmission connection with the driving unit; the output unit is at least partially arranged in the accommodating cavity and is in transmission connection with the magnetic gear set; the induction piece and the magnetic gear set are correspondingly arranged; the circuit board is electrically connected with the power supply, and the circuit board is electrically connected with the driving unit and controls the driving unit to operate. According to the gear shifting mechanism, accurate gear shifting can be achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a bicycle speed changer field, especially a rear electronic speed changer. BACKGROUND

[0002] The whole people health campaign has been deeply rooted in the heart and actually spread to the whole society, and the bicycle is a very popular sport, not only fitness, but also can make the footprint far touch, broaden the vision to win the book. The bicycle rear electronic speed changer includes a rear derailleur, and the rear derailleur is used for guiding the bicycle chain to one of the toothed discs of the rear sprocket, since each toothed disc of the rear sprocket has different size, so that the bicycle can change the gear position by the cooperation between the chain and the different toothed discs.

[0003] The existing speed changer can change the gear position by switching the bicycle chain and the gear disc of different sizes during the gear shifting process, when adjusting the speed, the derailleur is pulled by the cable, the chain is shifted from the current freewheel to the next freewheel, the gear position is switched, the transmission ratio of the front and rear gears and the driving pedaling force are adjusted, and different use requirements are met. However, this gear shifting mode cannot realize accurate gear shifting during the gear position switching process, and the chain is easy to jam and cause chain breakage during the switching process, which causes inconvenience to the user. UTILITY MODEL CONTENTS

[0004] In view of the defects of the prior art, the utility model provides a rear electronic speed changer, which can realize accurate gear shifting.

[0005] The utility model realizes the following technical schemes:

[0006] A rear electronic speed changer, including a rear derailleur and a power supply, the power supply supplies power to the rear derailleur, and the rear derailleur includes:

[0007] A housing, a receiving cavity is formed in the housing;

[0008] A drive unit, the drive unit is arranged in the receiving cavity;

[0009] A transmission unit, the transmission unit is arranged in the receiving cavity and includes a first gear set, a second gear set and a magnetic gear set which are sequentially engaged, and the first gear set is in transmission connection with the drive unit;

[0010] An output unit, the output unit is at least partially arranged in the receiving cavity and is in transmission connection with the magnetic gear set;

[0011] An inductor, the inductor is arranged in magnetic correspondence with the magnetic gear set;

[0012] A circuit board, the circuit board is electrically connected with the power supply, and the circuit board is electrically connected with the drive unit and controls the operation of the drive unit.

[0013] Further, the receiving cavity is further provided with a support frame for supporting the circuit board, and the housing comprises a lower shell, and the transmission unit is fixed between the support frame and the lower shell.

[0014] Further, the first gear set comprises a first shaft and a first driven gear, the first driven gear is sleeved on the first shaft, and the first shaft is rotatably arranged between the support frame and the lower shell.

[0015] Further, the second gear set comprises a second shaft, a second driving gear and a second driven gear, the second driving gear and the second driven gear are both sleeved on the second shaft, the second driving gear is located directly above the second driven gear and is engaged with the first driven gear, and the second shaft is rotatably arranged between the support frame and the lower shell.

[0016] Further, the magnetic gear set comprises a magnetic shaft, a third driving gear and a third driven gear, the third driving gear and the third driven gear are both sleeved on the magnetic shaft, the third driving gear is located directly below the third driven gear and is engaged with the second driven gear, and the magnetic shaft is rotatably arranged between the support frame and the lower shell.

[0017] Further, a first groove is formed in the top of the magnetic shaft, a magnet is arranged in the first groove, and the inductor is arranged in magnetic correspondence with the magnet.

[0018] Further, the driving unit comprises a motor, a worm gear and a worm, the worm is sleeved on a first output shaft of the motor, the worm gear is sleeved on the first shaft, and the worm gear is located directly above the first driven gear and is engaged with the worm.

[0019] Further, the output unit comprises a second output shaft and an output gear sleeved on the second output shaft, and the output gear is engaged with the third driven gear.

[0020] Further, the housing further comprises an upper shell, the upper shell is detachably connected with the lower shell, and a third sealing member is arranged at the connection between the upper shell and the lower shell.

[0021] Further, the inductor is a Hall sensor.

[0022] Compared with the prior art, the utility model has the advantages that:

[0023] 1. Through the operation of the driving unit, the magnetic gear set accurately adjusts the transmission ratio under the action of the inductor, ensures that the output unit outputs power efficiently and stably, and makes the gear shifting more accurate.

[0024] 2. The accurate engagement of the second driving gear and the first driven gear ensures the continuity and accuracy of power transmission, and further optimizes the overall performance of the transmission system.

[0025] 3. The magnetic magnet and Hall sensor are arranged correspondingly, which improves the sensing accuracy, reduces the energy loss and prolongs the service life of the device.

[0026] 4. The detachable design of the upper shell and the lower shell facilitates the maintenance and replacement of the internal components, and the third sealing element arranged between the upper shell and the lower shell further improves the waterproof performance of the transmission and ensures the long-term reliability of the internal elements. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a perspective assembly view of a rear electronic transmission according to an embodiment of the present application;

[0028] Figure 2 FIG. 2 is a partial assembly view of the rear electronic transmission according to the embodiment of the present application;

[0029] Figure 3 FIG. 3 is an exploded view of the rear electronic transmission according to the embodiment of the present application;

[0030] Figure 4 FIG. 4 is another exploded view of the rear electronic transmission according to the embodiment of the present application.

[0031] Label explanation: 1, rear derailleur; 2, shell; 21, upper shell; 211, fourth through hole; 212, eighth bearing; 213, first sealing element; 22, lower shell; 221, fourth blind hole; 222, fifth bearing; 223, fifth blind hole; 224, seventh bearing; 225, fifth through hole; 226, ninth bearing; 227, second sealing element; 23, accommodating cavity; 24, third sealing element; 3, driving unit; 31, motor; 311, first output shaft; 32, worm gear; 33, worm; 34, motor seat; 4, transmission unit; 41, first gear set; 411, first shaft; 412, first driven gear; 42, second gear set; 421, second shaft; 422, second driving gear; 423, second driven gear; 43, magnetic gear set; 431, magnetic shaft; 432, third driving gear; 433, third driven gear; 434, magnet; 437, first groove; 5, output unit; 51, second output shaft; 52, output gear; 6, circuit board; 62, support frame; 621, second blind hole; 622, second bearing; 623, third blind hole; 624, fourth bearing; 625, second through hole; 626, third through hole. DETAILED DESCRIPTION

[0032] The following detailed, non-limiting description of the utility model's technical solution, in conjunction with preferred embodiments and accompanying drawings, is provided. In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0033] like Figures 1 to 4 As shown, an embodiment of the present invention discloses a rear electronic derailleur, including a rear derailleur 1 and a power supply, the power supply providing power to the rear derailleur 1. The rear derailleur 1 includes a housing 2, a drive unit 3, a transmission unit 4, an output unit 5, a sensor, and a circuit board 6. The housing 2 contains a receiving cavity 23. The drive unit 3 is disposed within the receiving cavity 23. The transmission unit 4 is disposed within the receiving cavity 23 and includes a first gear set 41, a second gear set 42, and a magnetic gear set 43 that mesh sequentially. The first gear set 41 is driveably connected to the drive unit 3. The output unit 5 is at least partially disposed within the receiving cavity 23 and drively connected to the magnetic gear set 43. The sensor is magnetically corresponding to the magnetic gear set 43. The circuit board 6 is electrically connected to the power supply and to the drive unit 3, controlling the operation of the drive unit 3. Through the operation of the drive unit 3, the magnetic gear set 43 precisely adjusts the gear ratio under the action of the sensor, ensuring that the output unit 5 outputs power efficiently and stably, resulting in more precise gear shifting. Circuit board 6 monitors the status of each component in real time, optimizes the power distribution of the power supply, and improves the overall performance and durability of the transmission.

[0034] The following is based on Figure 2 and Figure 3 The internal structure of the housing 2 of the rear derailleur 1 is described in detail.

[0035] The support frame 62 is arranged in the accommodating cavity 23 and used for supporting the circuit board 6. The housing 2 comprises a lower housing 22, and the transmission unit 4 is fixed between the support frame 62 and the lower housing 22. The housing 2 further comprises an upper housing 21, which is detachably connected with the lower housing 22, facilitating maintenance and replacement of internal components. The connection between the upper housing 21 and the lower housing 22 is provided with a third sealing member 24. By arranging the third sealing member 24 between the upper housing 21 and the lower housing 22, it is prevented that water enters the accommodating cavity 23 to damage the motor 31 and the circuit board 6 during driving of the bicycle, further improving the waterproof performance of the transmission and ensuring long-term reliability of internal components.

[0036] Further, the drive unit 3 comprises a motor 31, a worm wheel 32 and a worm 33. The worm 33 is sleeved on a first output shaft 311 of the motor 31, and the worm wheel 32 is arranged on the first gear set 41. In the embodiment, the motor 31 is fixed in the accommodating cavity 23 through a motor seat 34, and the first output shaft 311 of the motor 31 is fixed on the motor seat 34 at the other end. The first output shaft 311 of the motor 31 drives the worm wheel 32 to rotate through the worm 33, thereby driving the first gear set 41 to achieve precise transmission ratio adjustment.

[0037] The first gear set 41 comprises a first shaft 411 and a first driven gear 412. The first driven gear 412 is sleeved on the first shaft 411, and the worm wheel 32 is sleeved on the first shaft 411 and located directly above the first driven gear 412 and engaged with the worm 33. The first shaft 411 is rotatably arranged between the support frame 62 and the lower housing 22. Specifically, the bottom of the support frame 62 is provided with a second blind hole 621, the second blind hole 621 contains a second bearing 622, one end of the first shaft 411 is installed in the second bearing 622, and the other end is installed on the motor seat 34 fixedly connected with the lower housing 22. The second bearing 622 ensures smooth rotation of the first shaft 411 and reduces friction loss. The close connection between the motor seat 34 and the lower housing 22 enhances the stability of the overall structure and effectively prevents the influence of vibration on transmission accuracy.

[0038] The second gear set 42 comprises a second shaft 421, a second driving gear 422 and a second driven gear 423, the second driving gear 422 and the second driven gear 423 are sleeved on the second shaft 421, and the second driving gear 422 is located directly above the second driven gear 423 and is engaged with the first driven gear 412, and the second shaft 421 is rotatably arranged between the support frame 62 and the lower shell 22. Specifically, the bottom of the support frame 62 is provided with a third blind hole 623, the fourth bearing 624 is accommodated in the third blind hole 623, the lower shell 22 is provided with a fourth blind hole 221, the fifth bearing 222 is accommodated in the fourth blind hole 221, and one end of the first shaft 411 is mounted in the fourth bearing 624 and the other end is mounted in the fifth bearing 222. The rotation stability of the second shaft 421 is jointly ensured by the fourth bearing 624 and the fifth bearing 222, effectively reducing friction and improving transmission efficiency. At the same time, the precise engagement of the second driving gear 422 and the first driven gear 412 ensures the continuity and accuracy of power transmission, further optimizing the overall performance of the transmission system.

[0039] The magnetic gear set 43 comprises a magnetic shaft 431, a third driving gear 432 and a third driven gear 433, the third driving gear 432 and the third driven gear 433 are sleeved on the magnetic shaft 431, and the third driving gear 432 is located directly below the third driven gear 433 and is engaged with the second driven gear 423, and the magnetic shaft 431 is rotatably arranged between the support frame 62 and the lower shell 22. The lower shell 22 is provided with a fifth blind hole 223, the seventh bearing 224 is accommodated in the fifth blind hole 223, and the bottom of the magnetic shaft 431 is mounted in the seventh bearing 224. The precise engagement of the third driving gear 432 and the second driven gear 423 ensures efficient and stable power transmission of the magnetic gear set 43, reducing energy loss.

[0040] The top of the magnetic shaft 431 is provided with a first recess 437, the first recess 437 is provided with a magnet 434, and the inductor is magnetically arranged corresponding to the magnet 434. In this embodiment, the inductor is preferably a Hall sensor. The precise cooperation of the magnet 434 and the Hall sensor ensures real-time monitoring of the rotation state of the magnetic gear set 43, further improving the response speed and stability of the transmission system. The design of the magnetic shaft 431 cleverly utilizes magnetic force coupling, reduces mechanical wear and prolongs the service life of the equipment.

[0041] Furthermore, the output unit 5 comprises a second output shaft 51 and an output gear 52 sleeved on the second output shaft 51, and the output gear 52 is engaged with the third driven gear 433.

[0042] Specifically, the fourth through hole 211 is formed on the upper shell 21, and the eighth bearing 212 is installed in the fourth through hole 211; the fifth through hole 225 is formed on the lower shell 22, and the ninth bearing 226 is installed in the fifth through hole 225; the third through hole 626 is formed on the support frame 62. In this embodiment, the lower end of the second output shaft 51 is installed in the ninth bearing 226, and the upper end passes through the third through hole 626 and is installed in the eighth bearing 212. The stable support structure of the second output shaft 51 ensures the accurate meshing of the output gear 52 and the third driven gear 433, effectively transmits power, and improves the overall operation stability of the system. At the same time, the high-precision design of the eighth bearing 212 and the ninth bearing 226 further reduces the friction loss, prolongs the equipment maintenance cycle, and enhances the reliability and durability of the system.

[0043] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as limiting the scope of the present application. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are all within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A rear electronic derailleur comprising a rear derailleur (1) and a power supply which powers the rear derailleur (1), characterized in that, The rear derailleur (1) comprises: a housing (2) with a receiving cavity (23) formed therein; a driving unit (3) arranged in the receiving cavity (23); a transmission unit (4) arranged in the receiving cavity (23) and comprising a first gear set (41), a second gear set (42) and a magnetic gear set (43) engaged in sequence, the first gear set (41) being in transmission connection with the driving unit (3); an output unit (5) arranged at least partially in the receiving cavity (23) and in transmission connection with the magnetic gear set (43); an inductor arranged in magnetic correspondence with the magnetic gear set (43); a circuit board (6) electrically connected with the power supply and electrically connected with the driving unit (3) and controlling the operation of the driving unit (3).

2. The rear electronic transmission of claim 1, wherein, The receiving cavity (23) further comprises a support frame (62) for supporting the circuit board (6), and the housing (2) comprises a lower housing (22), and the transmission unit (4) is fixed between the support frame (62) and the lower housing (22).

3. The rear electronic transmission of claim 2, wherein, The first gear set (41) comprises a first shaft (411) and a first driven gear (412), the first driven gear (412) is sleeved on the first shaft (411), and the first shaft (411) is rotatably arranged between the support frame (62) and the lower housing (22).

4. The rear electronic transmission of claim 3, wherein, The second gear set (42) comprises a second shaft (421), a second driving gear (422) and a second driven gear (423), the second driving gear (422) and the second driven gear (423) are sleeved on the second shaft (421), and the second driving gear (422) is located directly above the second driven gear (423) and is in engagement with the first driven gear (412), and the second shaft (421) is rotatably arranged between the support frame (62) and the lower housing (22).

5. The rear electronic transmission of claim 4, wherein, The magnetic gear set (43) comprises a magnetic shaft (431), a third driving gear (432) and a third driven gear (433), the third driving gear (432) and the third driven gear (433) are sleeved on the magnetic shaft (431), and the third driving gear (432) is located directly below the third driven gear (433) and is in engagement with the second driven gear (423), and the magnetic shaft (431) is rotatably arranged between the support frame (62) and the lower housing (22).

6. The rear electronic transmission of claim 5, wherein, A first groove (437) is formed in the top of the magnetic shaft (431), and a magnet (434) is arranged in the first groove (437), and the inductor is arranged in magnetic correspondence with the magnet (434).

7. The rear electronic transmission of claim 3, wherein, The driving unit (3) comprises a motor (31), a worm wheel (32) and a worm (33), the worm (33) is sleeved on a first output shaft (311) of the motor (31), the worm wheel (32) is sleeved on the first shaft (411), and the worm wheel (32) is located directly above the first driven gear (412) and is in mesh with the worm (33).

8. The rear electronic transmission of claim 5, wherein, The output unit (5) comprises a second output shaft (51) and an output gear (52) sleeved on the second output shaft (51), and the output gear (52) is in mesh with the third driven gear (433).

9. The rear electronic transmission of claim 2, wherein, The shell (2) further comprises an upper shell (21), the upper shell (21) is detachably connected with the lower shell (22), and a third sealing piece (24) is arranged at the connection position of the upper shell (21) and the lower shell (22).

10. The rear electronic transmission of claim 1, wherein, The inductor is a Hall sensor.

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