Bicycle planetary gear derailleur

Abstract

The utility model provides a bicycle planetary gear derailleur relates to bicycle technical field, including planetary gear, still include: transmission assembly, transmission assembly includes the gear shaft setting in planetary gear, the gear shaft is connected with the limit stopper piece on, in the utility model, through gear shaft drive transmission assembly, the limit stopper piece on gear shaft limits the radial displacement of planetary gear, ensures transmission stability, the mounting sleeve, the connecting ring, the pole shoe and the magnetic fluid constitute the magnetic transmission structure, and the pole shoe generates the magnetic field, and the form and movement of control magnetic fluid in first limit groove realize no contact power transmission, reduce friction, stable connection assembly, the bolt passes through the connecting block, first limit board, second limit board and elastic sheet cooperation, and elastic sheet provides elastic pre -tightening force, makes bolt connection more stable, buffers vibration, prevents the component loose, safeguards the stable operation of derailleur, has realized high -efficient stable transmission, low friction operation, safeguards the reliable operation of derailleur.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, and in particular to a bicycle planetary gear transmission. Background Technology

[0002] A bicycle planetary gear derailleur is a mechanical device that uses a planetary gear system to achieve multiple gear shifts. Through different gear combinations, it provides smooth power transmission and precise speed adjustment. It is widely used in modern bicycles to improve riding efficiency and comfort. This technology can effectively improve the stability, durability and response speed of gear shifting, and has become an important component of high-performance bicycles.

[0003] However, in actual use, the following shortcomings still exist. For example, existing bicycle planetary gear transmissions cannot achieve efficient and stable transmission and low-friction operation to ensure reliable operation of the transmission. Inefficient transmission will cause a large amount of the rider's pedaling energy to be consumed in friction and heat instead of being used to propel the bicycle forward. Especially when riding long distances or climbing hills, the rider will feel more tired. If the transmission cannot transmit power stably, there may be jerking, delay or skipping of gears when shifting gears, which will make it impossible for the rider to accurately control the speed and affect the riding experience. High-friction operation will accelerate the wear of key components such as gear teeth and bearings, and shorten the service life of the transmission.

[0004] Therefore, this utility model proposes a bicycle planetary gear transmission to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a planetary gear transmission for bicycles.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a bicycle planetary gear transmission, comprising planetary gears, and further comprising:

[0007] A transmission assembly includes a gear shaft disposed within a planetary gear, a limiting block connected to the gear shaft, the limiting block being disposed within the planetary gear, an mounting sleeve disposed on the gear shaft, a connecting ring connected to the gear shaft, a first limiting groove formed on the connecting ring, a magnetofluid disposed within the first limiting groove, a pole shoe connected to the outer side of the mounting sleeve near the first limiting groove, and a connecting block disposed on the gear shaft.

[0008] A stable connection assembly includes a bolt threaded into a connecting block, a first limiting plate being provided on the bolt, a second limiting plate being provided on the bolt near the first limiting plate, and a spring piece being provided between the first limiting plate and the second limiting plate.

[0009] Furthermore, a limiting block is connected to the mounting sleeve.

[0010] The beneficial effects of adopting the above-mentioned further solution are: the limiting block is fixed on the mounting sleeve to constrain the axial displacement of the gearbox on the bicycle, prevent it from moving around at high speed, and ensure transmission stability when the gear shaft is subjected to axial force.

[0011] Furthermore, one end of the mounting sleeve is connected to a first rubber ring, and the other end of the mounting sleeve is connected to a second rubber ring.

[0012] The beneficial effects of adopting the above-mentioned further solution are: the first rubber ring and the second rubber ring are respectively installed at both ends of the mounting sleeve to provide a sealing function. The first rubber ring and the second rubber ring can prevent dust and moisture from entering the interior of the mounting sleeve. Their elastic deformation ability can also compensate for assembly tolerances, ensure smooth operation of the gear shaft, and extend the service life of the transmission.

[0013] Furthermore, one end of the spring is connected to the first limiting plate, and the other end of the spring is connected to the second limiting plate.

[0014] The beneficial effect of adopting the above-mentioned further solution is that the two ends of the spring are respectively connected to the first limiting plate and the second limiting plate. When the bolt is tightened, the spring will produce elastic deformation, and the limiting plate and the connecting block will be kept in close contact through the reaction force.

[0015] Furthermore, the connecting block has a threaded groove, and the bolt is threaded into the threaded groove.

[0016] The beneficial effect of adopting the above-mentioned further solution is that when the bolt is screwed in, the threaded groove on the connecting block generates an axial preload through the wedging effect of the threaded inclined surface.

[0017] Furthermore, a second limiting groove is provided on the connecting block, and the second limiting plate is disposed in the second limiting groove.

[0018] The beneficial effect of adopting the above-mentioned further solution is that the second limiting groove is used to position the second limiting plate to prevent it from deflecting when the spring is compressed, thus ensuring the uniform distribution of axial force.

[0019] Compared with the prior art, the advantages and positive effects of this utility model are as follows:

[0020] In this invention, when the planetary gears rotate, they drive the transmission assembly via the gear shaft. The limiting block on the gear shaft restricts the radial displacement of the planetary gears, ensuring stable transmission. The mounting sleeve, connecting ring, pole shoes, and magnetofluid constitute a magnetic transmission structure. The pole shoes generate a magnetic field, controlling the shape and movement of the magnetofluid within the first limiting groove, achieving contactless power transmission, reducing friction, and stabilizing the connection assembly. Bolts pass through the connecting block, and the first and second limiting plates cooperate with the spring sheet. The spring sheet provides elastic preload, making the bolt connection more secure, buffering vibration, preventing component loosening, and ensuring stable operation of the transmission. This achieves efficient and stable transmission, low-friction operation, and ensures reliable operation of the transmission. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a bicycle planetary gear transmission according to the present invention;

[0022] Figure 2 This is a schematic diagram of the gear shaft structure of a bicycle planetary gear transmission according to the present invention;

[0023] Figure 3 This is a schematic diagram of the transmission component structure of a bicycle planetary gear transmission according to the present invention;

[0024] Figure 4 This is a cross-sectional view of the transmission component structure of a bicycle planetary gear transmission according to the present invention;

[0025] Figure 5 This is a schematic diagram of the stable connection component structure of a bicycle planetary gear transmission according to the present invention.

[0026] Figure label:

[0027] 1. Planetary gears;

[0028] 2. Transmission assembly; 21. Gear shaft; 22. Limiting block; 23. Mounting sleeve; 24. Limiting block; 25. Connecting ring; 26. First limiting groove; 27. Magnetofluid; 28. Pole shoe; 29. ​​First rubber ring; 210. Second rubber ring; 211. Connecting block;

[0029] 3. Stable connection assembly; 31. Bolt; 32. First limiting plate; 33. Second limiting plate; 34. Spring; 35. Threaded groove; 36. Second limiting groove. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] like Figures 1-5 As shown, this embodiment provides a technical solution: a bicycle planetary gear transmission, including a planetary gear 1, and further comprising:

[0032] The transmission assembly 2 includes a gear shaft 21 disposed within the planetary gear 1, a limit block 22 connected to the gear shaft 21, the limit block 22 disposed within the planetary gear 1, an mounting sleeve 23 disposed on the gear shaft 21, a connecting ring 25 connected to the gear shaft 21, a first limiting groove 26 formed on the connecting ring 25, a magnetorheological fluid 27 disposed within the first limiting groove 26, a pole shoe 28 connected to the outer side of the mounting sleeve 23 near the first limiting groove 26, and a connecting block 211 disposed on the gear shaft 21.

[0033] The stable connection assembly 3 includes a bolt 31 threaded into the connecting block 211. A first limiting plate 32 is provided on the bolt 31, and a second limiting plate 33 is provided on the side of the bolt 31 closest to the first limiting plate 32. A spring piece 34 is provided between the first limiting plate 32 and the second limiting plate 33. When the planetary gear 1 rotates, it drives the transmission assembly 2 through the gear shaft 21. The limiting block 22 on the gear shaft 21 restricts the radial displacement of the planetary gear 1 to ensure stable transmission. The assembly also includes a mounting sleeve 23, a connecting ring 25, and a pole shoe 2. 8 and the magnetofluid 27 form a magnetic transmission structure. The pole shoe 28 generates a magnetic field, which controls the shape and movement of the magnetofluid 27 in the first limiting groove 26, realizing contactless power transmission, reducing friction, and stabilizing the connection component 3. The bolt 31 passes through the connecting block 211. The first limiting plate 32, the second limiting plate 33 cooperate with the spring plate 34. The spring plate 34 provides elastic preload, making the bolt 31 connection more stable, buffering vibration, preventing component loosening, ensuring stable operation of the transmission, realizing efficient and stable transmission, low friction operation, and ensuring reliable operation of the transmission.

[0034] The above solutions also have the problem that, when the transmission is in use, it cannot provide a sealing function for the mounting sleeve 23, such as... Figures 1-4As shown: A limiting block 24 is connected to the mounting sleeve 23. The limiting block 24 is fixed to the mounting sleeve 23 and is used to constrain the axial displacement of the gearbox on the bicycle to prevent it from moving during high-speed operation. When the gear shaft 21 is subjected to axial force, it ensures transmission stability. One end of the mounting sleeve 23 is connected to a first rubber ring 29, and the other end of the mounting sleeve 23 is connected to a second rubber ring 210. The first rubber ring 29 and the second rubber ring 210 are respectively installed at both ends of the mounting sleeve 23 to provide a sealing function. The first rubber ring 29 and the second rubber ring 210 can prevent dust and moisture from entering the interior of the mounting sleeve 23. Their elastic deformation ability can also compensate for assembly tolerances, ensure smooth operation of the gear shaft 21, and extend the service life of the gearbox.

[0035] like Figures 1-3 as well as Figure 5 As shown, one end of the spring piece 34 is connected to the first limiting plate 32, and the other end of the spring piece 34 is connected to the second limiting plate 33. The two ends of the spring piece 34 are respectively connected to the first limiting plate 32 and the second limiting plate 33. When the bolt 31 is tightened, the spring piece 34 undergoes elastic deformation, and the limiting plate and the connecting block 211 are kept in close contact through the reaction force. The connecting block 211 has a threaded groove 35, and the bolt 31 is threaded into the threaded groove 35. When the bolt 31 is screwed in, the threaded groove 35 on the connecting block 211 generates an axial preload through the wedging effect of the threaded inclined surface. The connecting block 211 has a second limiting groove 36, and the second limiting plate 33 is set in the second limiting groove 36. The second limiting groove 36 is used to position the second limiting plate 33 to prevent it from deflecting when the spring piece 34 is pressed, and to ensure the uniform distribution of axial force.

[0036] Working principle:

[0037] like Figures 1-5As shown, in the transmission assembly 2, the mounting sleeve 23, connecting ring 25, pole shoe 28, and magnetofluid 27 constitute a magnetic transmission structure. The pole shoe 28 generates a magnetic field, and by controlling the shape and movement of the magnetofluid 27 within the first limiting groove 26, contactless power transmission is achieved, greatly reducing friction and improving transmission efficiency. At the same time, the limiting block 24 on the mounting sleeve 23 constrains the axial displacement of the gearbox on the bicycle, preventing it from shifting during high-speed operation and ensuring that the transmission remains stable and reliable when the gear shaft 21 is subjected to axial force. In addition, the first rubber ring 29 and the second rubber ring 210 at both ends of the mounting sleeve 23 provide a sealing function, preventing dust and moisture from entering the interior of the mounting sleeve 23 while allowing air to pass through. Elastic deformation compensates for assembly tolerances, ensuring smooth operation of gear shaft 21, extending the service life of the transmission, and stabilizing the connection assembly 3. Bolt 31 passes through threaded groove 35 on connecting block 211, and axial preload is generated by the wedging effect of threaded inclined surface. First limiting plate 32, second limiting plate 33 cooperate with spring plate 34. When bolt 31 is tightened, spring plate 34 undergoes elastic deformation, and the reaction force keeps second limiting plate 33 in close contact with connecting block 211. Second limiting groove 36 positions second limiting plate 33 to prevent it from deflecting when spring plate 34 is pressed, ensuring uniform distribution of axial force, buffering vibration, preventing component loosening, and thus ensuring stable operation of the transmission.

[0038] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. A bicycle epicyclic gear variator comprising an epicyclic gear (1), characterised in that, Also includes: The transmission assembly (2) includes a gear shaft (21) disposed in a planetary gear (1), a limiting block (22) connected to the gear shaft (21), the limiting block (22) disposed in the planetary gear (1), an mounting sleeve (23) disposed on the gear shaft (21), a connecting ring (25) connected to the gear shaft (21), a first limiting groove (26) opened on the connecting ring (25), a magnetofluid (27) disposed in the first limiting groove (26), a pole shoe (28) connected to the outside of the mounting sleeve (23) near the first limiting groove (26), and a connecting block (211) disposed on the gear shaft (21). A stable connection assembly (3) includes a bolt (31) threaded into a connecting block (211), a first limiting plate (32) is provided on the bolt (31), a second limiting plate (33) is provided on the bolt (31) near the first limiting plate (32), and a spring piece (34) is provided between the first limiting plate (32) and the second limiting plate (33).

2. A bicycle planetary gear variator according to claim 1, characterised in that: A limiting block (24) is connected to the mounting sleeve (23).

3. A bicycle planetary gear variator according to claim 1, characterised in that: One end of the mounting sleeve (23) is connected to a first rubber ring (29), and the other end of the mounting sleeve (23) is connected to a second rubber ring (210).

4. A bicycle planetary gear variator according to claim 1, characterised in that: One end of the spring piece (34) is connected to the first limiting plate (32), and the other end of the spring piece (34) is connected to the second limiting plate (33).

5. A bicycle planetary gear variator according to claim 1, characterised in that: The connecting block (211) has a threaded groove (35), and the bolt (31) is threaded into the threaded groove (35).

6. A bicycle planetary gear variator according to claim 1, characterised in that: The connecting block (211) is provided with a second limiting groove (36), and the second limiting plate (33) is disposed in the second limiting groove (36).

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