Chain wheel structure and bicycle
By introducing movable bushings and telescopic mechanisms into the bicycle, the position of the chainring can be adjusted, solving the angle problem during gear shifting in multi-speed bicycles, improving riding efficiency and stability, reducing wear, and extending the lifespan of the bicycle.
Patent Information
- Application Number
- CN202520428159.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-03-12
AI Technical Summary
In existing multi-speed bicycles, the angle between the chain and chainring, and between the chain and freewheel, causes axial separation during gear shifting, affecting riding efficiency and making it prone to chain slippage, asymmetrical wear and deformation of the teeth, which affects the riding experience and the lifespan of the bicycle.
It adopts a movable bushing and telescopic mechanism. The telescopic mechanism drives the bushing to move axially along the central axis, adjusts the position of the chainring, and reduces the angle between the chain, chainring, and freewheel. The telescopic mechanism actively drives the chainring to move, ensuring smoother and more precise engagement between the chain and chainring.
Improve riding efficiency, reduce chain slippage and tooth wear, extend bicycle lifespan, and enhance riding stability and experience.
Smart Images
Figure CN223821924U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a bicycle technical field, in particular to a tooth disc structure and bicycle. BACKGROUND
[0002] In recent years, speed bicycle obtains the rapid development, and the speed system is as the important component of the speed bicycle, and has the important influence to the performance of the speed bicycle. In the related technology, when the speed bicycle shifts, the chain will be around the different levels of the freewheel, and then the angle between the chain and the tooth disc and the chain and the freewheel changes. As long as the angle is not zero, the driving force of the chain will be separated in the axial direction because of the existence of the included angle, cannot drive the freewheel rotation with full force, influences the riding efficiency. At the same time, it is also easy to cause the shift to be not smooth, and the chain drops back, the tooth part is not asymmetric wear, the tooth part deformation and so on, which will not only influence the riding experience, but also shorten the service life of the bicycle. SUMMARY
[0003] The utility model aims at at least one of the technical problems existing in the prior art. Therefore, the utility model provides a tooth disc structure, which can not only improve the riding efficiency of the user, but also reduce the chain drop back, the tooth part asymmetric wear and the tooth part deformation, thereby improving the riding experience of the user and prolonging the service life of the bicycle.
[0004] The utility model further provides a bicycle with the tooth disc structure.
[0005] According to the tooth disc structure of the utility model first aspect embodiment, including the middle shaft, the shaft sleeve, the tooth disc and the telescopic mechanism, the middle shaft is used to rotate and install in the frame, the shaft sleeve is sleeved in the middle shaft and can move along the axial direction of the middle shaft, the shaft sleeve and the middle shaft are relatively fixed in the circumferential direction of the middle shaft, the tooth disc is arranged in the shaft sleeve, the telescopic mechanism is located on the outside of the middle shaft and is connected to the shaft sleeve and / or the tooth disc, so as to drive the shaft sleeve to move along the axial direction of the middle shaft through telescopic, and the shaft sleeve can rotate relative to the telescopic mechanism.
[0006] According to the tooth disc structure of the utility model embodiment, at least has the following beneficial effects:
[0007] The utility model discloses a movable shaft sleeve is arranged on the middle shaft, and the tooth disc is arranged on the shaft sleeve, when the gear shifting of the bicycle freewheel is carried out, the telescopic drive shaft sleeve moves along the axial direction of the middle shaft, and then the tooth disc is driven to adaptively adjust the position along with the change of the bicycle gear, so that the included angle between the chain and the tooth disc and the included angle between the chain and the freewheel are effectively reduced, thereby improving the riding efficiency of the bicycle user. In addition, because the included angle is small, the meshing cutting range of the chain and the tooth part of the tooth disc is wider, the chain can be reduced, the wear of the asymmetric tooth part is reduced, the axial stress of the tooth part is reduced, the deformation of the tooth part is reduced, thereby prolonging the service life. In addition, compared with the movement of the tooth disc driven by the chain when the freewheel gear shifting is carried out, the tooth disc is actively driven to move through the telescopic mechanism, the movement of the tooth disc is smoother and more accurate, the jamming phenomenon can be reduced, and after moving to the corresponding position, the tooth disc will not move randomly, thereby improving the stability of riding. In addition, the shaft sleeve can rotate relative to the telescopic mechanism, thereby avoiding the interference between the shaft sleeve and the telescopic mechanism when the shaft sleeve rotates along with the middle shaft.
[0008] According to some embodiments of the utility model, the tooth disc structure further includes an assembly seat, the assembly seat is used for being installed on the frame, the middle shaft is rotatably installed in the mounting hole, a clearance cavity is formed between the hole wall of the mounting hole and the outer peripheral wall of the middle shaft, and the shaft sleeve extends into the clearance cavity.
[0009] According to some embodiments of the utility model, the tooth disc structure further includes a first bearing and a second bearing, the first bearing is installed at one end of the mounting hole away from the tooth disc, the second bearing is installed at one end of the mounting hole close to the tooth disc, and the middle shaft is rotatably installed in the first bearing and the second bearing.
[0010] According to some embodiments of the utility model, the second bearing is a needle bearing and is sleeved on the outer side of the shaft sleeve, and the shaft sleeve can move relative to the second bearing along the axial direction of the middle shaft.
[0011] According to some embodiments of the utility model, the tooth disc structure further includes an assembly seat, the assembly seat is used for being installed on the frame, the middle shaft is rotatably installed in the assembly seat, and the telescopic mechanism is arranged in the assembly seat.
[0012] According to some embodiments of the utility model, the tooth disc structure further includes a third bearing, the third bearing is arranged on the shaft sleeve and / or the tooth disc and is coaxial with the shaft sleeve, the third bearing is connected to the telescopic mechanism, and the shaft sleeve rotates relative to the telescopic mechanism through the third bearing.
[0013] According to some embodiments of the present invention, the telescopic mechanism is provided in multiple forms and is evenly arranged along the circumference of the bushing; and / or, the telescopic mechanism is at least one of a hydraulic cylinder, a pneumatic cylinder, or an electric push rod.
[0014] According to some embodiments of the present invention, the length of the bushing along its own axial direction is 1.2 to 3 times the travel of the bushing.
[0015] According to some embodiments of the present invention, the chainring structure further includes a position detection unit, an electronic control module, and a display unit. The position detection unit is used to obtain the position of the chainring on the central axis. The electronic control module is electrically connected to the position detection unit. The display unit is disposed on the frame and is electrically connected to the electronic control module.
[0016] According to some embodiments of the present invention, a key structure is installed between the central shaft and the bushing, and the relative rotation between the central shaft and the bushing is restricted by the key structure.
[0017] The bicycle according to a second aspect embodiment of the present invention includes the chainring structure described in the first aspect embodiment above.
[0018] The bicycle according to the embodiments of this utility model has at least the following beneficial effects:
[0019] The chainring structure of the first aspect of this utility model not only improves the cycling efficiency of cyclists but also reduces chain slippage, asymmetrical wear of the teeth, and tooth deformation, thereby enhancing the cycling experience and extending the lifespan of the bicycle. Furthermore, compared to shifting gears via a chain-driven chainring, this application actively drives the chainring movement through the extension and retraction of a telescopic mechanism. This results in smoother and more precise chainring movement, reducing the occurrence of jamming, and ensuring that the chainring stays in place after reaching its designated position, thus improving riding stability. Additionally, the bushing can rotate relative to the telescopic mechanism, preventing interference between the bushing and the mechanism when the bushing rotates with the bottom bracket.
[0020] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and some of these additional aspects and advantages will become apparent from the description or may be learned by practice of the invention. Attached Figure Description
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0022] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.
[0023] Figure 2This is a schematic diagram illustrating the fit between the chainring and the flywheel of this utility model.
[0024] Figure 3 This is a schematic diagram of the overall structure of the toothed disc of this utility model;
[0025] Figure 4 This is a partial cross-sectional view of the toothed disc structure of this utility model;
[0026] Figure 5 This is an electrical system diagram of the toothed disc structure of this utility model.
[0027] Icon labels:
[0028] Central shaft 100; limiting protrusion 101;
[0029] Bushing 200;
[0030] Crankset 300;
[0031] Telescopic mechanism 400;
[0032] First bearing 500; axial locking structure 501; first locking plug 502; first sealing ring 503;
[0033] Second bearing 600; Second locking plug 601; Second sealing ring 602;
[0034] Assembly base 700; mounting hole 701; clearance cavity 702;
[0035] Frame 800;
[0036] Third bearing 900;
[0037] Crank connecting shaft 1000;
[0038] Flywheel 1100;
[0039] Position detection unit 1201; electronic control module 1202; display unit 1203; power storage unit 1204; wireless communication module 1205. Detailed Implementation
[0040] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.
[0041] In the description of this utility model, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0042] In the description of this utility model, "multiple" refers to two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features or their sequential relationship.
[0043] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this utility model in conjunction with the specific content of the technical solution.
[0044] To better describe the chainring structure and bicycle of this application embodiment, a brief description is given here of the 300° angle change between the chain and chainring during conventional bicycle gear shifting. (Reference) Figure 1 When the chain is in the highest gear position on the cassette 1100, i.e., the highest gear ratio, there is a large angle θ between the chain and the chainring 300. Because of this angle θ, a large axial component of the chain's driving force cannot be used to drive the cassette 1100 to rotate, resulting in energy waste. Understandably, the larger the angle θ, the more energy is wasted. This embodiment reduces energy waste by lowering the angle θ, thereby improving riding efficiency. (Refer to...) Figure 2 , Figure 2 The dashed rectangle can be understood as the position of the crankset 300 before it moves, and the solid rectangle can be understood as the position of the crankset 300 after it moves. The included angle after the movement is β, which is significantly smaller than the angle θ, thus effectively reducing the axial force component.
[0045] The following is for reference. Figures 3 to 5 This invention describes a chainring structure and a bicycle according to an embodiment of the present invention.
[0046] like Figure 3 and Figure 4 As shown, the toothbrush structure according to the first aspect of the present invention includes a central shaft 100, a bushing 200, a toothbrush 300, and a telescopic mechanism 400.
[0047] The bottom bracket 100 is rotatably mounted on the frame 800. A bushing 200 is fitted onto the outside of the bottom bracket 100 and can move axially along the bottom bracket 100. The bushing 200 and the bottom bracket 100 are circumferentially fixed. A chainring 300 is mounted on the bushing 200. A telescopic mechanism 400 is located outside the bottom bracket 100 and connected to the bushing 200 and / or the chainring 300, allowing for telescopic movement.
[0048] The drive bushing 200 moves axially along the central shaft 100, and the bushing 200 can rotate circumferentially relative to the telescopic mechanism 400.
[0049] For example, the bottom bracket 100 can be mounted on the frame 800 via an assembly mount 700. Specifically, the assembly mount 700 can be equipped with a bearing system, and the bottom bracket 100 is mounted on the bearing system to enable the bottom bracket 100 to rotate. In addition, crank connecting shafts 1000 can be provided at both ends of the bottom bracket 100 for connecting cranks. The cranks are used to mount pedals, and the cyclist rotates the cranks by pedaling, thereby driving the bottom bracket 100 to rotate.
[0050] The bushing 200 is fitted onto the outside of the central shaft 100 and can move along the central shaft 100. After the chainring 300 is fixed on the bushing 200, the chainring 300 can move along the central shaft 100, thereby adjusting the relative position of the chainring 300 and the central shaft 100. The bushing 200 and the central shaft 100 are relatively fixed in the circumferential direction so that when the central shaft 100 rotates, it can drive the bushing 200 to rotate, thereby driving the chainring 300 to rotate.
[0051] Furthermore, the length of the bushing 200 can be flexibly adjusted according to actual needs, for example, Figure 3 As shown, when the design length is long, the bushing 200 can be extended between the central shaft 100 and the bearing system used to mount the central shaft 100. When the design length is short, it does not need to extend between the central shaft 100 and the bearing system used to mount the central shaft 100, and the entire bushing remains outside the bearing system. It should be noted that both the long and short bushing 200 have their advantages. When the demand for moving drive of the sprocket 300 is relatively small, a shorter bushing 200 can be considered.
[0052] The telescopic mechanism 400 is located outside the bottom bracket 100. For example, it can be mounted on the assembly seat 700 or directly on the frame 800. The telescopic mechanism 400 can be connected to the bushing 200, the chainring 300, or both. The telescopic direction of the telescopic mechanism 400 can be axial with respect to the bottom bracket 100, or slightly offset relative to the axial direction of the bottom bracket 100. The telescopic mechanism 400 can drive the bushing 200 to move through its own telescopic movement, thereby adjusting the relative position of the chainring 300 and the bottom bracket 100, and further adjusting the relative position between the chainring 300 and the freewheel 1100, thus adjusting the angle between the chain and the chainring 300. It should be noted that the bushing 200 can rotate circumferentially relative to the telescopic mechanism 400.
[0053] Because the aforementioned telescopic mechanism 400 is an actively adjusting mechanism, it can also restrict the movement of the bushing 200. That is, the bushing 200 will not move passively due to the traction of the chain, thus improving the stability of riding.
[0054] In this invention, a movable bushing 200 is provided on the bottom bracket 100, and a chainring 300 is provided on the bushing 200. When the bicycle freewheel 1100 changes gears, the telescopic mechanism 400 can drive the bushing 200 to move axially along the bottom bracket 100, thereby driving the chainring 300 to adapt its position to the gear changes. This effectively reduces the angle between the chain and the chainring 300, as well as the angle between the chain and the freewheel 1100, thus improving the cyclist's riding efficiency. Furthermore, because the angles are smaller, the meshing range between the chain and the chainring or freewheel teeth is wider, reducing chain slippage, asymmetrical wear of the teeth, and axial stress on the teeth, which helps reduce tooth deformation and extends service life. Furthermore, compared to the cassette 1100 where the chain drives the chainring 300 during gear shifts, this application actively drives the chainring 300 through the extension and retraction of the telescopic mechanism 400. This results in smoother and more precise chainring movement, reducing the likelihood of jamming, and once in the correct position, it remains stationary, improving riding stability. Additionally, the bushing 200 of this application can rotate circumferentially relative to the telescopic mechanism 400, thus preventing interference between the bushing 200 and the telescopic mechanism 400 when the bushing 200 rotates with the bottom bracket 100.
[0055] It should be noted that the chainring 300 can stop at multiple gears when it moves along the axial direction of the central shaft 100, for example, it can be three. The gears of the chainrings on both sides can correspond to multiple gears on both sides of the freewheel 1100, and the gears of the chainring in the middle can correspond to multiple gears in the middle of the freewheel 1100.
[0056] In some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the assembly seat 700 is used to mount on the frame 800. The assembly seat 700 is provided with a mounting hole 701. The central shaft 100 is rotatably mounted in the mounting hole 701. A relief cavity 702 is formed between the hole wall of the mounting hole 701 and the outer peripheral wall of the central shaft 100. The relief cavity 702 allows the bushing 200 to extend into it.
[0057] For example, the assembly seat 700 may be detachably mounted on the frame 800, such as by snapping onto the frame 800 or by fasteners. The assembly seat 700 has a horizontally extending mounting hole 701, with both ends of the mounting hole 701 extending through. The central shaft 100 may be mounted within the mounting hole 701 via a bearing system to allow the central shaft 100 to rotate, and a clearance cavity 702 is formed between the wall of the mounting hole 701 and the outer peripheral wall of the central shaft 100. The bushing 200 can be moved axially along the central shaft 100 to any position, with a portion of its structure extending into the relief cavity 702; alternatively, when the bushing 200 is moved to a partial position closer to the assembly seat 700, a portion of its structure extends into the relief cavity 702, and when the bushing 200 is moved to a partial position further away from the assembly seat 700, the entire bushing 200 is located outside one end of the assembly seat 700. The specific length of the bushing 200 can be flexibly adjusted according to actual needs, and will not be elaborated further here.
[0058] In this embodiment, compared to the bushing 200 which can only move back and forth outside one end of the assembly seat 700, in this application, a relief cavity 702 is formed between the hole wall of the mounting hole 701 and the outer peripheral wall of the bottom bracket 100. The bushing 200 can extend into the relief cavity 702, which not only makes the movement path of the bushing 200 longer, thus making the adjustment range of the chainring 300 along the axial direction of the bottom bracket 100 larger, but also makes the bushing 200 extend further along the axial direction of the bottom bracket 100, thus making the structure of the bushing 200 stronger. At the same time, the installation stability of the bushing 200 is better, which can reduce the shaking of the chainring 300, thereby further improving the riding experience.
[0059] Understandably, if the bushing 200 can only move back and forth outside one end of the assembly seat 700, not only is the movement path of the bushing 200 short, but also, since the distance between the end of the bottom bracket 100 and the assembly seat 700 is fixed, in order for the bushing 200 to move a certain displacement along the axial direction of the bottom bracket 100, the length of the bushing 200 can only be set to be short. Thus, not only is the structural strength low, but the stability is also poor, and the chainring 300 is prone to shaking, affecting the riding experience. In this application, a relief cavity 702 for the bushing 200 to extend into is formed between the hole wall of the mounting hole 701 and the outer peripheral wall of the bottom bracket 100, which can effectively solve the above problems.
[0060] In some embodiments of this utility model, such as Figure 4 As shown, the toothed disc 300 can be installed on the end of the bushing 200 away from the assembly seat 700. When the bushing 200 moves to any position along the axial direction of the central shaft 100, the end of the bushing 200 away from the toothed disc 300 is always located in the relief cavity 702.
[0061] In this embodiment, this configuration not only makes the bushing 200 extend longer along the axial direction of the central shaft 100, thus making the bushing 200 structurally stronger, but also improves the installation stability of the bushing 200, reducing the shaking of the chainring 300 and further improving the riding experience. In addition, it can also avoid interference between the bushing 200 and the assembly seat 700 when the bushing 200 enters the clearance cavity 702, thus making the movement of the bushing 200 smoother.
[0062] In some embodiments of this utility model, such as Figure 4 As shown, the crank mechanism also includes a first bearing 500 and a second bearing 600. The first bearing 500 is installed in the end of the mounting hole 701 away from the crank 300, and the second bearing 600 is installed in the end of the mounting hole 701 close to the crank 300. The central shaft 100 is installed in the first bearing 500 and the second bearing 600.
[0063] In this embodiment, the rotation setting of the central shaft 100 can be achieved by using the first bearing 500 and the second bearing 600, which satisfies the rotation requirements of the central shaft 100 and makes the rotation of the central shaft 100 smoother.
[0064] In some embodiments of this utility model, such as Figure 4 As shown, a limiting protrusion 101 is provided on the outer peripheral wall of the central shaft 100, and on the side of the first bearing 500 near the bushing 200, to provide a directional restriction. Simultaneously, an axial locking structure 501 is provided on the outer peripheral wall of the central shaft 100, and on the side of the first bearing 500 away from the bushing 200, thereby restricting the first bearing 500 in another direction and also restricting the axial movement of the central shaft 100. For example, the axial locking structure 501 can be an axial locking nut, and the outer peripheral wall of the end of the central shaft 100 away from the bushing 200 can be provided with external threads, with the axial locking nut threadedly connected to the central shaft 100. Alternatively, the axial locking structure 501 can be a locking ring, and the outer peripheral wall of the end of the central shaft 100 away from the bushing 200 can be provided with a retaining ring, with the axial lock engaged within the retaining ring.
[0065] In some embodiments of this utility model, such as Figure 4As shown, on the assembly seat 700 or the frame 800, a first locking plug 502 is provided on the side of the first bearing 500 away from the bushing 200. The first locking plug 502 is located on the outer periphery of the axial locking structure 501 to fix the first bearing 500. On the assembly seat 700 or the frame 800, a second locking plug 601 can be provided on the side of the second bearing 600 away from the first bearing 500. The second locking plug 601 can be located on the outer side of the bushing 200 to fix the second bearing 600.
[0066] It should be noted that when there is a gap between the first locking screw plug 502 and the axial locking structure 501, a first sealing ring 503 can be provided between the first locking screw plug 502 and the axial locking structure 501. When there is a gap between the second locking screw plug 601 and the bushing 200, a second sealing ring 602 can be provided between the second locking screw plug 601 and the bushing 200.
[0067] In some embodiments of this utility model, the first bearing 500 can be a ball bearing. In this embodiment, the ball bearing's strong axial bearing capacity can better withstand the axial force when the crankset 300 moves, and the ball bearing can better fix the central shaft 100.
[0068] It should be noted that the first bearing 500 can also be other suitable types of bearings, which will not be elaborated here.
[0069] In some embodiments of this utility model, such as Figure 4 As shown, the second bearing 600 is configured as a needle roller bearing and is sleeved on the outside of the bushing 200. The bushing 200 can move relative to the second bearing 600 along the axial direction of the central shaft 100. For example, the second bearing 600 can be a needle roller bearing without an inner ring, and the end of the bushing 200 away from the gear sprocket 300 can extend into the second bearing 600 as the inner ring of the second bearing 600.
[0070] In this embodiment, the bushing 200 extends into the second bearing 600 and can rotate relative to the second bearing 600, thereby reducing the circumferential friction force on the outer peripheral wall of the bushing 200, making the rotation of the bushing 200 smoother, and thus improving riding efficiency. In addition, since the second bearing 600 is set as a needle roller bearing, the bushing 200 can move axially relative to the second bearing 600 along the central shaft 100, thereby reducing the axial friction force on the outer peripheral wall of the bushing 200, making the axial movement of the bushing 200 along the central shaft 100 smoother, and the shifting of the chainring 300 smoother. Furthermore, the bushing 200 can also support the second bearing 600, making the installation of the second bearing 600 more stable.
[0071] It should be noted that the second bearing 600 can also be other suitable types of bearings, which will not be elaborated here.
[0072] In some embodiments of this utility model, such as Figure 3 and Figure 4 As shown, the telescopic mechanism 400 is disposed in the assembly base 700. For example, the assembly base 700 may have a mounting cavity, and the telescopic mechanism 400 is disposed in the mounting cavity.
[0073] In this embodiment, by setting the central shaft 100 and the telescopic mechanism 400 in the assembly base 700, the entire crankcase structure can be set as an assembly structure. Thus, the assembly base 700 can be used to quickly install and replace the entire crankcase structure, providing users with a better user experience.
[0074] In some embodiments of this utility model, such as Figure 4 As shown, the crankcase structure also includes a third bearing 900, which is disposed on the bushing 200 and / or the crankcase 300 and is coaxial with the bushing 200. The third bearing 900 is connected to the telescopic mechanism 400, and the bushing 200 rotates relative to the telescopic mechanism 400 through the third bearing 900.
[0075] For example, the third bearing 900 may include an inner ring and an outer ring that rotate relative to each other. One of the inner ring and the outer ring is fixedly connected to the bushing 200 and / or the toothed sprocket 300, and the other is fixedly connected to the telescopic mechanism 400. The bushing 200 can rotate relative to the telescopic mechanism 400 by the relative rotation of the inner ring and the outer ring. The structure is simple, and the bushing 200 can rotate relative to the telescopic mechanism 400 when it rotates to any angle, which makes it more practical.
[0076] It should be noted that one of the inner ring and the outer ring can be fixedly connected to the bushing 200, fixedly connected to the crankcase 300, or fixedly connected to both the bushing 200 and the crankcase 300.
[0077] In some embodiments of this utility model, such as Figure 4 As shown, multiple telescopic mechanisms 400 are provided and are evenly arranged along the circumference of the bushing 200. For example, there can be three, four, or other suitable numbers of telescopic mechanisms 400, and the multiple telescopic mechanisms 400 are evenly arranged along the circumference of the bushing 200.
[0078] In this embodiment, the bushing 200 is configured such that when the bushing 200 is driven, the bushing 200 is subjected to more uniform force, which in turn makes the bushing 200 slide more smoothly.
[0079] In some embodiments of this utility model, the telescopic mechanism 400 is at least one of a hydraulic cylinder, a pneumatic cylinder, or an electric actuator. Taking a hydraulic cylinder as an example, the cylinder body can be mounted on the assembly seat 700 or the frame 800. The piston rod of the cylinder can be connected to the bushing 200 and / or the crankshaft 300. The frame 800 can also be equipped with an oil pump, an oil supply pipe, an oil tank, etc. The oil pump is located between the oil tank and the cylinder via the oil supply pipe. The oil pump controls the sliding of the piston rod by injecting or extracting oil into the rodless chamber of the cylinder and into the rod chamber of the cylinder, thereby realizing telescopic movement.
[0080] In this embodiment, the telescopic mechanism 400 is a hydraulic cylinder, a pneumatic cylinder, or an electric push rod, which has a simple structure, is easy to install, and has a good telescopic effect.
[0081] It should be noted that when there is only one telescopic mechanism 400, it can be one of a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. When there are multiple telescopic mechanisms 400, all of them can also be one of a hydraulic cylinder, a pneumatic cylinder, or an electric push rod. In other words, different telescopic mechanisms 400 can be of different types.
[0082] In some embodiments of this utility model, such as Figure 4 As shown, the length of the bushing 200 along its own axial direction is 1.2 to 3 times the travel of the bushing 200. For example, the length of the bushing 200 along its own axial direction can be 1.2, 2, 2.5, 3 times, or other suitable multiples of the travel of the bushing 200. This not only avoids the bushing 200 being too long, resulting in a too low travel of the bushing 200 and thus affecting the shifting effect of the gear sprocket 300, but also avoids the bushing 200 being too short, resulting in a decrease in structural strength and unstable installation.
[0083] In some embodiments of this utility model, such as Figure 4 As shown, a key structure is installed between the central shaft 100 and the bushing 200, and the key structure restricts the relative rotation of the central shaft 100 and the bushing 200. For example, both the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with keyways, the keyways extending along the axial direction of the central shaft 100, and the key structure is installed in both keyways and can slide relative to the keyways along the axial direction of the central shaft 100. Alternatively, one of the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with a keyway, the keyway extending along the axial direction of the central shaft 100, and the key structure is installed in the other and extends into the keyway, the key structure being able to slide relative to the keyway along the axial direction of the central shaft 100.
[0084] In this embodiment, the key structure can restrict the relative rotation between the central shaft 100 and the bushing 200, thereby enabling the central shaft 100 to drive the toothed disc 300 on the bushing 200 to rotate.
[0085] In some embodiments of this utility model, such as Figure 5 As shown, the above-mentioned toothed disc structure also includes: a position detection unit 1201, an electronic control module 1202, and a display unit 1203;
[0086] The position detection unit 1201 is used to obtain the position of the crankcase 300 on the central axis 100;
[0087] The electronic control module 1202 is electrically connected to the position detection unit 1201;
[0088] The display unit 1203 is mounted on the frame 800 and is electrically connected to the electronic control module 1202.
[0089] The aforementioned position detection unit 1201 can be configured in various ways. For example, a laser radar installed on the frame 800 can be used to detect the distance between the frame 800 and the chainring 300, and then the position of the chainring 300 on the bottom bracket 100 can be determined through simple calculations. Alternatively, other non-contact sensors such as ultrasonic sensors can be used to complete the detection. The specific detection methods are diverse.
[0090] The aforementioned position detection unit 1201 can use a displacement sensor to directly detect the extension distance of the telescopic end of the telescopic mechanism 400, for example, the extension distance of the piston rod of the hydraulic cylinder or the lead screw of the electric push rod. This can effectively reduce the interference of external factors on the detection, improve the accuracy of the detection, and also effectively reduce the damage to the position detection unit 1201 caused by external impacts.
[0091] The aforementioned electronic control module 1202 can obtain the position information of the crankset 300 on the central axis 100 through the position detection unit 1201, and then display the position information on the display unit 1203.
[0092] The aforementioned display unit 1203 can be directly mounted on the bicycle handlebars. By mounting the display unit 1203 on the frame 800, the rider can easily understand the current position of the chainring 300 during riding, thereby improving the efficiency and accuracy of chainring adjustments.
[0093] In some embodiments of this utility model, the toothbrush structure further includes a power storage unit 1204; the power storage unit 1204 is used to provide power to the electronic control module 1202, the display unit 1203, and the wireless communication module 1205.
[0094] In this embodiment, the energy storage unit 1204 is directly used as the power source, such as a lithium battery or other storage battery, which can effectively improve the user experience, as the user no longer needs to connect an external power source for power supply.
[0095] In some embodiments of this utility model, the electronic control module 1202, the display unit 1203, and the wireless communication module 1205 can also be powered by a mobile power supply.
[0096] In some embodiments of this utility model, the toothbrush structure further includes a wireless communication module 1205, which is electrically connected to the electronic control module 1202.
[0097] The aforementioned wireless communication module 1205 can achieve wireless communication with the outside world. For example, the current relative position of the chainring 300 can be transmitted to the outside world through the wireless communication module 1205. It can also upload the operating data collected by the other bicycle electronic control modules 1202 to the cloud for storage and recording, so as to provide users with more in-depth services in the future.
[0098] The aforementioned wireless communication module 1205 can be a Bluetooth, WIFI, or other wireless communication module. The specific choice depends on the actual requirements.
[0099] The bicycle according to a second aspect embodiment of the present invention includes the chainring structure described in the first aspect embodiment.
[0100] The bicycle according to the embodiments of this utility model, by adopting the chainring structure of the first aspect of this utility model, not only improves the riding efficiency of the cyclist, but also reduces chain slippage, asymmetrical wear of the teeth, and tooth deformation, thereby improving the riding experience and extending the service life of the bicycle. Furthermore, compared to the chainring 300 being driven by the chain during gear shifting on the freewheel 1100, this application actively drives the chainring 300 through the extension and retraction of the telescopic mechanism 400. The chainring 300 moves more smoothly and precisely, reducing the occurrence of jamming, and once it reaches the corresponding position, it will not move arbitrarily, improving riding stability. In addition, the bushing 200 of this application can rotate circumferentially relative to the telescopic mechanism 400, thereby preventing interference between the bushing 200 and the telescopic mechanism 400 when the bushing 200 rotates with the bottom bracket 100.
[0101] It should be noted that since the bicycle can adopt all the technical solutions of the chainring structure of the first aspect embodiment described above, it has at least all the beneficial effects brought about by the technical solutions of the first aspect embodiment described above. These additional beneficial effects will not be elaborated here.
[0102] It is understood that other components and operations of the bicycle according to the embodiments of the present invention are known to those skilled in the art and will not be described in detail here.
[0103] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.
Claims
1. A toothed disc structure, characterized in that, include: The center axle is used for rotatable mounting to the chassis; A bushing is fitted onto the central shaft and can move along the axial direction of the central shaft. The bushing and the central shaft are fixed relative to each other in the circumferential direction of the central shaft. The toothed disc is disposed on the bushing; A telescopic mechanism, located outside the central shaft and connected to the bushing and / or the gear set, drives the bushing to move axially along the central shaft via telescopic movement, the bushing being rotatable relative to the telescopic mechanism.
2. The toothed disc structure according to claim 1, characterized in that, The toothed disc structure also includes: An assembly seat is provided for mounting on the vehicle frame. The assembly seat has a mounting hole, and the central shaft is rotatably mounted in the mounting hole. A clearance cavity is formed between the wall of the mounting hole and the outer peripheral wall of the central shaft, and the clearance cavity allows the bushing to extend into it.
3. The toothed disc structure according to claim 2, characterized in that, The toothed disc structure also includes: A first bearing is installed at the end of the mounting hole away from the toothed disc; The second bearing is installed at one end of the mounting hole near the toothed disc; The central shaft is rotatably mounted within the first bearing and the second bearing.
4. The toothed disc structure according to claim 3, characterized in that, The second bearing is configured as a needle roller bearing and is sleeved on the outside of the bushing, and the bushing can move relative to the second bearing along the axial direction of the central shaft.
5. The toothed disc structure according to claim 1, characterized in that, The toothed disc structure also includes: An assembly base is used to mount the vehicle frame, the central shaft is rotatably mounted on the assembly base, and the telescopic mechanism is located on the assembly base.
6. The toothed disc structure according to claim 1, characterized in that, The toothed disc structure also includes: A third bearing is disposed on the bushing and / or the toothed disc and is coaxial with the bushing. The third bearing is connected to the telescopic mechanism, and the bushing rotates relative to the telescopic mechanism through the third bearing.
7. The toothed disc structure according to claim 1, characterized in that, The telescopic mechanism is provided in multiple forms and is evenly arranged along the circumference of the bushing; and / or, The telescopic mechanism is at least one of a hydraulic cylinder, a pneumatic cylinder, or an electric push rod.
8. The toothed disc structure according to claim 1, characterized in that, The length of the bushing along its own axis is 1.2 to 3 times the travel of the bushing.
9. The toothed disc structure according to claim 1, characterized in that, The toothed disc structure also includes: A position detection unit is used to obtain the position of the toothed disc on the central axis; The electronic control module is electrically connected to the position detection unit; The display unit is mounted on the vehicle frame and is electrically connected to the electronic control module.
10. A bicycle, characterized in that, Includes the toothed disc structure as described in any one of claims 1 to 9.