Large-torque clamping type flywheel of electric vehicle with middle motor
Through the design of nine sets of cassette sprockets and the initial fixation of pre-solid cylinders, the problem of insufficient structural strength of the cassette flywheel is solved, and the high torque requirements and stable high-speed operation of the mid-mounted motor electric vehicle are achieved.
Patent Information
- Application Number
- CN202422940910.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-30
- Publication Date
- 2025-08-26
- Estimated Expiration
- 2034-11-30
AI Technical Summary
The existing cassette flywheel structure cannot meet the strength of the bicycles installed with motors, and the teeth are prone to fracture, which cannot meet the high torque requirements of the mid-mounted motor.
The nine-group casing sprocket design is adopted, and the first sprocket and the second sprocket are integrated. Other sprockets are connected by the first and second rivets, which increase structural compactness and rigidity, and is initially fixed with pre-solid cylinders and locking rings to ensure the stability and removability of the sprocket during high-speed operation.
Improves the overall structural strength and stability of the cassette flywheel, reduces the risk of loose or damaged teeth, ensures smooth shifting operation and extends service life.
Smart Images
Figure CN223270553U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of cassette flywheels, and in particular to a high-torque cassette flywheel for a mid-mounted motor electric vehicle. Background Art
[0002] A cassette freewheel is a bicycle flywheel that fits on a cassette hub and is standard equipment on modern sports bikes. The ratchet mechanism of a cassette freewheel is built into the hub, while the flywheel itself consists of just a few teeth connected to the hub via slots, forming a single unit.
[0003] With technological advancements, more and more bicycles are being equipped with electric motors to assist in propulsion. Mid-mounted motors typically require greater torque, meaning they can deliver greater torque at lower speeds. However, current cassette flywheels, typically composed of individual sprockets, lack the structural strength to accommodate motor-mounted bicycles, making them prone to sprocket breakage. Utility Model Content
[0004] In order to improve the structural strength of a cassette flywheel used in a mid-motor electric vehicle, the present application provides a high-torque cassette flywheel for a mid-motor electric vehicle.
[0005] The present application provides a high-torque cassette flywheel for a mid-mounted motor electric vehicle using the following technical solutions:
[0006] A high-torque cassette flywheel for a mid-mounted motor electric vehicle comprises nine sets of cassette sprockets, a connecting assembly for connecting adjacent cassette sprockets, and a locking ring for compressing the cassette sprockets. The outer diameters of the nine sets of cassette sprockets are, from small to large, the first sprocket, the second sprocket, the third sprocket, the fourth sprocket, the fifth sprocket, the sixth sprocket, the seventh sprocket, the eighth sprocket, and the ninth sprocket. The connecting assembly connects the third to ninth sprockets. The first sprocket and the second sprocket are integrally arranged. The locking ring is arranged on the side of the first sprocket away from the second sprocket.
[0007] By adopting the above technical solution, the two smallest sprockets are arranged in one piece, making the cassette flywheel more compact and stronger in structure, reducing the connection gap between the sprockets, and for bicycles equipped with motors, it helps to improve the overall rigidity of the flywheel, making it more stable at high speeds and reducing the risk of sprocket loosening or damage due to long-term use.
[0008] Optionally, the connecting assembly includes a plurality of first rivets circumferentially arranged along the axis of the cassette flywheel, and the first rivets are penetrated to fix the third to ninth sprockets.
[0009] By adopting the above technical solution, multiple sprockets are precisely connected by the first rivets, ensuring that the relative positions between the sprockets are fixed, thereby allowing the bicycle chain to move smoothly between gears, which helps to achieve smooth gear shifting operations.
[0010] Optionally, a plurality of second rivets are further provided between the eighth sprocket and the ninth sprocket, wherein the second rivets are located outside the first rivets, and the eighth sprocket and the ninth sprocket are connected via the second rivets.
[0011] By adopting the above technical solution, the second rivet connects the two largest sprockets, further improving the overall structural strength of the flywheel, helping to prevent the flywheel from being deformed or damaged when rotating at high speed or being impacted, thereby extending the service life of the flywheel.
[0012] Optionally, a first clip gasket is provided between the ninth sprocket and the eighth sprocket, between the eighth sprocket and the seventh sprocket, and between the seventh sprocket and the sixth sprocket.
[0013] By adopting the above technical solution, the first cassette gasket is located between the sprockets, which can reduce the probability of the chain getting stuck between the sprocket and the hub spoke when the chain accidentally falls off, thereby reducing the possibility of the rear wheel locking or causing a fall accident.
[0014] Optionally, the outer diameter of the first clip gasket is larger than the outer diameter of the concentric circle where the first rivet is located, the outer diameter of the first clip gasket gradually decreases from the ninth sprocket to the seventh sprocket, and the outer diameter of the first clip gasket between the ninth sprocket and the eighth sprocket is larger than the outer diameter of the concentric circle where the second rivet is located.
[0015] By adopting the above technical solution, as the diameter of the sprocket changes, the gap between the sprockets will also vary. The first card gasket with a gradually smaller outer diameter can better adapt to this gap change, ensuring that the gasket can fit tightly against the sprocket and improving the transmission stability of the chain and sprocket.
[0016] Optionally, a second clip gasket is provided between the sixth sprocket and the fifth sprocket, the fifth sprocket and the fourth sprocket, and the fourth sprocket and the third sprocket, and the outer diameter of the second clip gasket is larger than the outer diameter of the concentric circle where the first rivet is located.
[0017] By adopting the above technical solution, the uniform outer diameter of the gasket makes the installation process simpler and faster, reducing the installation time and difficulty.
[0018] Optionally, it also includes a pre-fixed column for cooperating and fixing with the locking ring, the length of the pre-fixed column is greater than the axial length of the nine sets of cassette sprockets, and the end of the pre-fixed column has a snap-in groove for inserting the locking ring.
[0019] By adopting the above technical solution and setting the pre-fixed column, the cassette flywheel can be pre-fixed after production, reducing the probability of sprocket separation during transportation of the cassette flywheel and facilitating the assembly of the cassette flywheel and the bicycle.
[0020] Optionally, the inner side wall of the snap-in groove is provided with an installation groove and an elastic plunger member arranged in the installation groove, the elastic plunger member includes a plunger housing, an elastic member and a plunger ball head, and the inner side wall of the locking ring has a limiting ring groove that is engaged with the plunger ball head.
[0021] By adopting the above technical solution, the locking ring is inserted into the snap-fit groove, and then the plunger ball head of the elastic plunger is automatically snapped into the limiting ring groove, thereby realizing the connection between the locking ring and the pre-fixed column, and improving the stability of the locking ring pressing sprocket.
[0022] Optionally, a pulling column for pulling the plunger housing is slidably installed in the pre-consolidated column, and a connecting rope connected to the end of the plunger housing is provided on the side wall of the pulling column.
[0023] By adopting the above technical solution and setting up the pulling column and the connecting rope, when it is necessary to remove the locking ring for assembling the cassette flywheel, the user slides the pulling column, and the connecting rope drives the elastic plunger to move away from the limiting ring groove, thereby unlocking the locking ring and the pre-fixed column.
[0024] Optionally, the inner wall of the mounting groove is provided with a first return spring connected to the plunger housing, and the pulling column sleeve is provided with a second return spring for resetting.
[0025] By adopting the above technical solution, the two reset springs are provided so that after the user releases the pulling column, the pulling column and the elastic plunger can automatically reset to the initial state, so as to facilitate the next pre-fixation of the cassette flywheel.
[0026] In summary, this application includes at least one of the following beneficial technical effects:
[0027] By integrating the first sprocket and the second sprocket, the present invention makes the cassette flywheel more compact and robust in structure. For bicycles equipped with motors, this helps to improve the overall rigidity of the flywheel, making it more stable during high-speed operation.
[0028] The present application ensures that the relative positions of the sprockets are fixed by setting the connecting assembly, thereby allowing the bicycle chain to move smoothly between the gears, which helps to achieve a smooth gear shifting operation;
[0029] This application uses the provision of a pre-fixed column to facilitate the locking ring to pre-fix nine sets of sprockets on the pre-fixed column, and through the provision of a pulling column, improves the disassembly efficiency of the locking ring and the pre-fixed column. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] Figure 1 It is a cross-sectional schematic diagram of the cassette flywheel according to an embodiment of the present application.
[0031] Figure 2 It is a plan view of the embodiment of the present application observed from the direction of the first sprocket.
[0032] Figure 3 yes Figure 1 A local enlarged schematic diagram of point A in the middle.
[0033] Figure 4 It is a partial cross-sectional schematic diagram of the cassette flywheel according to an embodiment of the present application.
[0034] Figure 5 It is a cross-sectional schematic diagram of the pre-fixed column and the cassette flywheel after being locked in the embodiment of the present application.
[0035] Figure 6 yes Figure 5 A partial enlarged schematic diagram of point B in the middle.
[0036] Explanation of reference numerals: 1. first sprocket; 2. second sprocket; 3. third sprocket; 4. fourth sprocket; 5. fifth sprocket; 6. sixth sprocket; 7. seventh sprocket; 8. eighth sprocket; 9. ninth sprocket; 10. spacer; 11. contact portion; 12. first rivet; 13. second rivet; 14. first sunken groove; 15. second sunken groove; 16. first clip gasket; 17. second clip gasket; 18. lock Tightening ring; 19. Pre-fixed column; 20. Snap-fit groove; 21. Mounting groove; 22. Elastic plunger member; 23. Plunger housing; 24. Elastic member; 25. Plunger ball head; 26. Limiting ring groove; 27. Pulling column; 28. Sliding groove; 29. Pulling hole; 30. Connecting rope; 31. First return spring; 32. Extension; 33. Abutment rod; 34. Second return spring; 35. Abutment ring; 36. Limiting groove. DETAILED DESCRIPTION
[0037] The following is combined with Figure 1-6 This application is described in further detail.
[0038] The embodiments of the present application disclose a high-torque cassette flywheel for a mid-mounted motor electric vehicle.
[0039] Reference Figure 1 and Figure 2 A high-torque cassette flywheel for a mid-mounted motor electric vehicle includes nine sets of cassette sprockets, a connecting assembly for connecting adjacent cassette sprockets, and a locking ring 18 for fixedly connecting to a bicycle hub.
[0040] The outer diameters of the nine sets of cassette sprockets are, from small to large, the first sprocket 1, the second sprocket 2, the third sprocket 3, the fourth sprocket 4, the fifth sprocket 5, the sixth sprocket 6, the seventh sprocket 7, the eighth sprocket 8 and the ninth sprocket 9. The thickness of each sprocket is 1.6 mm.
[0041] Reference Figure 1 and Figure 3 To ensure the structural strength of a bicycle equipped with an electric motor, the first sprocket 1 and the second sprocket 2 are integrally formed, with a spacer 10 formed between them. The cross-section of the spacer 10 along the flywheel's axis is stepped, with the outer diameter decreasing from the first sprocket 1 to the second sprocket 2. An abutment 11 is integrally formed on the side of the second sprocket 2 facing the third sprocket 3. The arrangement of the spacer 10 and the abutment 11 creates an axial gap between the adjacent first and second sprockets 1 and 2, and between the second and third sprockets 2 and 3.
[0042] Reference Figure 4 The connecting assembly includes a first rivet 12 connecting the third to ninth sprockets 9 and a second rivet 13 connecting the eighth sprocket 8 and the ninth sprocket 9.
[0043] First rivets 12 are spaced circumferentially along the flywheel axis. In this embodiment, the flywheel is equipped with three sets of evenly spaced first rivets 12, all located on the side of the sprocket closest to the flywheel axis. A first recess 14 is defined on the end face of the third sprocket 3 facing the second sprocket 2. Once secured, the first rivet 12's end in the first recess 14 is flush with the end face of the third sprocket 3. The first rivets 12 securely connect the third through ninth sprockets 9, improving overall flywheel stability and shifting efficiency.
[0044] Second rivets 13 are spaced circumferentially along the flywheel axis. In this embodiment, the flywheel is equipped with six sets of evenly spaced second rivets 13. All second rivets 13 are located on the side of the sprocket facing away from the flywheel axis. A second recess 15 is defined on the end face of the eighth sprocket 8 facing the seventh sprocket 7. Once secured, the second rivets 13 are fixed so that the end of the second recess 15 is flush with the end face of the eighth sprocket 8. The second rivets 13 securely connect the eighth sprocket 8 to the second sprocket 2, further enhancing the overall stability of the flywheel.
[0045] A first clipping washer 16 is provided between the sixth and seventh sprockets 6, 7, the seventh and eighth sprockets 7, and the eighth and ninth sprockets 8, 9, to separate adjacent sprockets. The first clipping washer 16 is made of plastic, and its outer diameter gradually decreases as the size of the mounted sprockets changes. The outer diameter of the first clipping washer 16 between the eighth sprocket 8 and the second sprocket 2 is larger than the outer diameter of the concentric circle containing the second rivet 13. The first clipping washer 16 has through-holes for the second rivet 13 and the first rivet 12 to pass through.
[0046] Second clip washers 17 are provided between the third sprocket 3 and the fourth sprocket 4, between the fourth sprocket 4 and the fifth sprocket 5, and between the fifth sprocket 5 and the sixth sprocket 6 to separate two adjacent sprockets. The second clip washers 17 are all made of plastic. The outer diameters of the three sets of second clip washers 17 are all the same and are larger than the outer diameter of the concentric circle in which the second rivet 13 is located.
[0047] The locking ring 18 is inserted into the inner hole of the first sprocket 1, and the side wall of the inner hole of the first sprocket 1 is provided with an external thread. When assembling the cassette flywheel and the bicycle, the nine sprockets are first placed on the bicycle hub in sequence, and then the locking ring 18 is inserted into the first sprocket 1, so that the locking ring 18 and the hub are threaded together, and the nine sprockets are compressed and fixed by the locking ring 18.
[0048] Reference Figure 5 and Figure 6 In some other embodiments of the present application, a pre-fixed column 19 is also included for auxiliary assembly of the cassette flywheel. The pre-fixed column 19 is used to initially fix the nine sets of sprockets and the locking ring 18 after the cassette flywheel is produced, so as to reduce the probability of the cassette flywheel being dispersed during transportation.
[0049] The length of the pre-stressing cylinder 19 is greater than the axis length of the nine sprocket sets, and its outer wall has a ridged groove (not shown) that fits into the inner bore of the sprockets. The end of the pre-stressing cylinder 19 has a snap-in groove 20 that engages with the locking ring 18. This snap-in groove 20 is an annular groove with multiple mounting slots 21 circumferentially defined along the inner sidewall of the pre-stressing cylinder 19, facing the axis. Within these mounting slots 21, the pre-stressing cylinder 19 has a resilient plunger 22 mounted for connection to the locking ring 18.
[0050] The elastic plunger 22 comprises a plunger housing 23, an elastic member 24 secured within the plunger housing 23, and a plunger ball 25 connected to the elastic member 24. The elastic member 24 is a compression spring, with its ends secured to the bottom wall of the inner cavity of the plunger housing 23 and the plunger ball 25, respectively. In its normal state, the plunger ball 25 protrudes from the inner wall of the engaging groove 20.
[0051] The inner wall of the locking ring 18 is provided with a retaining ring groove 26 for locking with the plunger ball 25. When the locking ring 18 is inserted into the engaging groove 20, the locking ring 18 first squeezes the plunger ball 25 into the plunger housing 23. When the retaining ring groove 26 and the plunger housing 23 are aligned, the plunger ball 25 is reset and snapped into the retaining ring groove 26 under the action of the elastic member 24.
[0052] In order to facilitate the disassembly and assembly of the locking ring 18 and the pre-fixed column 19, the pre-fixed column 19 is also slidably installed with a pulling column 27. The pre-fixed column 19 is provided with a sliding groove 28 along the axis for the installation of the pulling column 27, and the pulling column 27 and the pre-fixed column 19 are coaxially arranged. The inner wall of the sliding groove 28 has a pulling hole 29 connected to the installation groove 21, and a plurality of connecting ropes 30 are fixed to the end of the pulling column 27 facing the pulling hole 29. The connecting rope 30 is made of a high-strength, wear-resistant limiting material. The other end of the connecting rope 30 is fixed to the outer wall of the plunger housing 23. When the sliding pulling column 27 is not needed, the pulling column 27 can be limited and fixed by means of a pin or the like to limit the sliding of the pulling column 27.
[0053] The depth of the mounting groove 21 is greater than the length of the plunger housing 23. A first return spring 31 is fixedly installed in the mounting groove 21 toward the bottom wall of the pre-fixed column 19, and the other end of the first return spring 31 is fixed to the outer bottom of the plunger housing 23. Among them, the side wall of the plunger housing 23 is integrally provided with an extension portion 32 along the axial direction, and the extension portion 32 is arranged in a direction away from the locking ring 18. The opposite sides of the extension portion 32 are provided with limit bars (not marked in the figure) for guiding the sliding of the plunger housing 23, and the mounting groove 21 is provided with a limit groove 36 that cooperates with the limit bar. The side wall of the pre-fixed column 19 has an abutment rod 33 for abutting the extension portion 32, and the abutment rod 33 and the pulling column 27 slide synchronously. When the locking ring 18 is inserted, the elastic plunger member 22 as a whole will not slide toward the axial direction of the pre-fixed column 19.
[0054] A second return spring 34 is mounted within the sliding groove 28, which is sleeved around the pull post 27. The pull post 27 has an abutment ring 35 that abuts the second return spring 34. The arrangement of the first return spring 31 and the second return spring 34 allows the pull post 27 and the elastic plunger 22 to return to their initial positions after the operator releases the pull post 27.
[0055] The implementation principle of a high-torque card flywheel for a mid-mounted motor electric vehicle in the embodiment of the present application is as follows: the eighth sprocket 8 and the ninth sprocket 9 are fixed by the second rivet 13, and then the third sprocket 3 to the ninth sprocket 9 are fixed by the first rivet 12;
[0056] The pre-fixed column 19 is inserted into the inner hole of the flywheel from the side of the ninth sprocket 9, and then the sprocket is pressed onto the pre-fixed column 19 through the cooperation of the locking ring 18 and the clamping groove 20; when the locking ring 18 needs to be disassembled, the user slides and pulls the column 27 to release the abutment between the abutment rod 33 and the extension part 32, and then under the action of the connecting rope 30, the elastic plunger 22 is disengaged from the limiting ring groove 26 to unlock the locking ring 18.
[0057] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.
Claims
1. A high-torque cassette flywheel for a mid-mounted motor electric vehicle, characterized in that: The invention comprises nine groups of cassette sprockets, a connecting assembly for connecting adjacent cassette sprockets, and a locking ring (18) for pressing the cassette sprockets. The outer diameters of the nine groups of cassette sprockets are, from small to large, the first sprocket (1), the second sprocket (2), the third sprocket (3), the fourth sprocket (4), the fifth sprocket (5), the sixth sprocket (6), the seventh sprocket (7), the eighth sprocket (8), and the ninth sprocket (9). The connecting assembly connects the third to ninth sprockets (9). The first sprocket (1) and the second sprocket (2) are integrally arranged. The locking ring (18) is arranged on the side of the first sprocket (1) away from the second sprocket (2).
2. A high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 1, characterized in that: The connection assembly comprises a plurality of first rivets (12) arranged circumferentially along the axis of the cassette flywheel, wherein the first rivets (12) penetrate and fix the third to ninth sprockets (9).
3. A high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 2, characterized in that: A plurality of second rivets (13) are further provided between the eighth sprocket (8) and the ninth sprocket (9), wherein the second rivets (13) are located outside the first rivets (12), and the eighth sprocket (8) and the ninth sprocket (9) are connected via the second rivets (13).
4. A high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 3, characterized in that: A first clip-type gasket (16) is provided between the ninth sprocket (9) and the eighth sprocket (8), between the eighth sprocket (8) and the seventh sprocket (7), and between the seventh sprocket (7) and the sixth sprocket (6).
5. The high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 4, characterized in that: The outer diameter of the first clip gasket (16) is greater than the outer diameter of the concentric circle where the first rivet (12) is located, the outer diameter of the first clip gasket (16) gradually decreases from the ninth sprocket (9) to the seventh sprocket (7), and the outer diameter of the first clip gasket (16) between the ninth sprocket (9) and the eighth sprocket (8) is greater than the outer diameter of the concentric circle where the second rivet (13) is located.
6. The high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 2, characterized in that: A second clip-on gasket (17) is provided between the sixth sprocket (6) and the fifth sprocket (5), between the fifth sprocket (5) and the fourth sprocket (4), and between the fourth sprocket (4) and the third sprocket (3), and the outer diameter of the second clip-on gasket (17) is greater than the outer diameter of the concentric circle where the first rivet (12) is located.
7. The high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 1, characterized in that: It also includes a pre-fixed column (19) for cooperating and fixing with the locking ring (18), the length of the pre-fixed column (19) is greater than the axial length of the nine sets of cassette sprockets, and the end of the pre-fixed column (19) has a clamping groove (20) for inserting the locking ring (18).
8. The high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 7, characterized in that: The inner side wall of the clamping groove (20) is provided with a mounting groove (21) and an elastic plunger member (22) arranged in the mounting groove (21). The elastic plunger member (22) includes a plunger housing (23), an elastic member (24) and a plunger ball head (25). The inner side wall of the locking ring (18) has a limiting ring groove (26) that is clamped with the plunger ball head (25).
9. The high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 8, characterized in that: A pulling column (27) for pulling the plunger housing (23) is slidably installed in the pre-fixed column (19), and a connecting rope (30) connected to the end of the plunger housing (23) is provided on the side wall of the pulling column (27).
10. A high-torque cassette flywheel for a mid-mounted motor electric vehicle according to claim 9, characterized in that: The inner wall of the mounting groove (21) is provided with a first return spring (31) connected to the plunger housing (23), and the pulling column (27) is sleeved with a second return spring (34) for resetting.