Chain wheel assembly and bicycle
By incorporating movable bushings and drive mechanisms into the bicycle, the chainring position is actively adjusted, solving the problems of riding efficiency and stability during gear shifting in multi-speed bicycles. This results in a more efficient and stable riding experience and extends the lifespan of the bicycle.
Patent Information
- Application Number
- CN202520427187.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-01-20
- Estimated Expiration
- 2035-03-12
AI Technical Summary
When shifting gears on a multi-speed bicycle, the change in angle between the chain and chainring, and between the chain and freewheel, causes axial separation, affecting riding efficiency and resulting in problems such as chain slippage, chain wear, and deformation.
Design a chainring assembly that uses a movable bushing and drive mechanism on the bottom bracket to drive the chainring to move axially along the bottom bracket, adjusting the angle between the chain and the chainring. The drive mechanism actively adjusts the position of the chainring to reduce the angle, thereby reducing the engagement range between the chain and the freewheel and improving engagement accuracy and stability.
Improves riding efficiency, reduces chain slippage and tooth wear, extends bicycle lifespan, and enhances riding stability and smoothness.
Smart Images
Figure CN223812686U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a bicycle technical field, especially a tooth disc assembly and a bicycle. BACKGROUND
[0002] When the speed change bicycle is switched, the angle between the chain and the tooth disc and the angle between the chain and the freewheel will change due to the change of the chain winding on the different levels of the freewheel, when the angle is not zero, the driving force of the chain will be separated axially due to the existence of the angle, and then it cannot be used to drive the freewheel to rotate maximally, which affects the riding efficiency of the bicycle user, in addition, it is easy to cause the gear shifting to be not smooth, the chain to be dropped back, the tooth part to be worn asymmetrically and the tooth part to be deformed, etc., which not only affects the riding experience of the user, but also reduces the service life of the bicycle. SUMMARY
[0003] The utility model aims at solving one of the technical problems in the prior art. To this end, the utility model provides a tooth disc assembly, which can not only improve the riding efficiency of the user, but also reduce the chain drop back, the tooth part wear asymmetrically and the tooth part deformation, etc., 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 above tooth disc assembly.
[0005] According to the tooth disc assembly of the first aspect of the utility model, the middle shaft is used to be rotatably installed on the frame, the shaft sleeve is sleeved on the middle shaft and can move along the axial direction of the middle shaft, the shaft sleeve and the middle shaft are fixed in the circumferential direction, the tooth disc is arranged on the shaft sleeve, and the driving mechanism is used to drive the shaft sleeve to move along the axial direction of the middle shaft.
[0006] The tooth disc assembly according to the utility model has at least the following beneficial effects:
[0007] The utility model discloses, through setting up the movable shaft sleeve on the middle shaft, and setting up the tooth disc on the shaft sleeve, and then can drive the tooth disc on the shaft sleeve along the axial movement of the middle shaft through the drive mechanism, finally, when the derailleur of the bicycle carries out the gear switching, can utilize the drive mechanism and drive the tooth disc to follow the adaptive position adjustment of the bicycle gear change, to make the included angle between the chain and tooth disc and the included angle between the chain and the derailleur effectively reduce, thereby improve the riding efficiency of the bicycle user. In addition, because the included angle is small, the meshing cut-in range of the chain and the tooth part of the tooth disc or the derailleur is wider, can reduce the back-off chain, reduce the wear and tear of the asymmetric tooth part, reduce the axial stress of the tooth part, is favorable to reducing the tooth part deformation, thereby can prolong the service life. In addition, compared with the derailleur gear shifting through the chain driving tooth disc movement, the application is through the drive mechanism initiative drive tooth disc movement, and tooth disc movement is more smooth and accurate, can reduce the phenomenon of jamming, and after moving to the corresponding position, will not move at will, improve the stability of riding.
[0008] According to some embodiments of the utility model, the drive mechanism includes screw rod, connecting piece and drive part, the screw rod is rotatably installed on the middle shaft or the frame, and extends along the axial direction of the middle shaft, the connecting piece is provided with a threaded hole and is screwed to the screw rod through the threaded hole, the connecting piece is connected to the shaft sleeve and / or the tooth disc, the drive part is connected to the screw rod, and is used for driving the screw rod to rotate and drive the connecting piece to move along the axial direction of the middle shaft, so that the shaft sleeve moves along the axial direction of the middle shaft.
[0009] According to some embodiments of the utility model, the middle shaft is provided with an installation cavity, the drive mechanism is installed in the installation cavity, the outer peripheral wall of the middle shaft is provided with a clearance slot communicating with the installation cavity, the clearance slot extends along the axial direction of the middle shaft, and the connecting piece is arranged in the clearance slot.
[0010] According to some embodiments of the utility model, the screw rod is coaxial with the middle shaft.
[0011] According to some embodiments of the utility model, the tooth disc assembly further includes first bearing and second bearing, the first bearing is sleeved on the outside of the end of the middle shaft away from the tooth disc, and axially limits the middle shaft, the second bearing is sleeved on the outside of the middle shaft and is located between the tooth disc and the first bearing, and the first bearing and the second bearing are used for rotatably installing the middle shaft.
[0012] According to some embodiments of the utility model, the second bearing is arranged as a needle bearing and is sleeved on the outside of the shaft sleeve, and the shaft sleeve can move relative to the second bearing along the axial direction of the middle shaft.
[0013] According to some embodiments of the present invention, the chainring assembly further includes an assembly base for detachable mounting to the frame, and the bottom bracket is rotatably mounted on the assembly base.
[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, 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.
[0016] The bicycle according to a second aspect embodiment of the present invention includes the chainring assembly described in the first aspect embodiment above.
[0017] The bicycle according to the embodiments of this utility model has at least the following beneficial effects:
[0018] The chainring assembly 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 through a drive mechanism, resulting in smoother and more precise chainring movement, reducing jamming, and ensuring that the chainring stays in place after reaching its designated position, thus improving riding stability.
[0019] 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
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0021] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.
[0022] Figure 2 This is a schematic diagram illustrating the fit between the chainring and the freewheel of this utility model.
[0023] Figure 3 This is a schematic diagram of the overall structure of the toothed disc assembly of this utility model;
[0024] Figure 4 This is a partial cross-sectional view of the toothed disc assembly of this utility model.
[0025] Icon labels:
[0026] Middle shaft 100;Mounting cavity 101;Let place slot 102;Limiting protruding block 103;
[0027] Shaft sleeve 200;
[0028] Tooth disc 300;
[0029] Driving mechanism 400;Lead screw 401;Connecting piece 402;Driving part 403;Power supply 404;Speed reducer 405;Electronic control module 406;
[0030] First bearing 500;Axial locking structure 501;First locking plug 502;First sealing ring 503;
[0031] Second bearing 600;Second locking plug 601;Second sealing ring 602;
[0032] Assembly seat 700;
[0033] Frame 800;
[0034] Crank connecting shaft 900;
[0035] Flywheel 1000. DETAILED DESCRIPTION
[0036] The embodiments of the present application are described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are only used to explain the present application, and cannot be understood as a limitation of the present application.
[0037] In the description of the present application, it should be understood that the orientation description, such as the orientation or position relationship indicated by up, down, etc. is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.
[0038] In the description of the present application, the plurality refers to two or more than two. If there is a description of first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features.
[0039] In the description of the present application, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.
[0040] For better description of the sprocket assembly and bicycle according to the embodiments of the present application, the angle change between the chain and the sprocket 300 during the conventional gear adjustment process of the bicycle is briefly described herein. Referring to Figure 1 , the chain is in the highest gear of the freewheel 1000, that is, the highest gear ratio, at this time, there is a large included angle θ between the chain and the sprocket 300, because of the existence of the θ angle, the driving force of the chain will have a large axial component that cannot be used to drive the freewheel 1000 to rotate, thereby causing energy waste. It can be understood that the larger the θ angle, the more energy is wasted, and the embodiments of the present application reduce the energy waste by reducing the θ angle, thereby improving the riding efficiency. Referring to Figure 2 , Figure 2 , the dashed rectangular frame before the sprocket 300 moves can be understood as the position of the sprocket 300 before moving, and the solid rectangular frame after the sprocket 300 moves can be understood as the position of the sprocket 300 after moving. The included angle is β after moving, which is obviously smaller than the θ angle, thereby effectively reducing the axial component.
[0041] The sprocket assembly and bicycle according to the embodiments of the present application are described below with reference to Figure 3 and Figure 4 .
[0042] As shown in Figure 3 and Figure 4 , the sprocket assembly according to the first aspect of the embodiments of the present application comprises a middle shaft 100, a shaft sleeve 200, a sprocket 300 and a driving mechanism 400.
[0043] The middle shaft 100 is used to be rotatably installed on the frame 800, the shaft sleeve 200 is sleeved on the outer side of the middle shaft 100 and can move along the axial direction of the middle shaft 100, the shaft sleeve 200 is fixedly arranged in the circumferential direction with the middle shaft 100, the sprocket 300 is arranged on the shaft sleeve 200, and the driving mechanism 400 is used to drive the shaft sleeve 200 to move along the axial direction of the middle shaft 100.
[0044] For example, the middle shaft 100 can be arranged on the frame 800 through a bearing system, so that the middle shaft 100 can rotate. In addition, the two ends of the middle shaft 100 can be provided with crank connecting shafts 900 for connecting cranks, and the cranks are used to install pedals. The user of the bicycle rotates the cranks through the pedals, and then drives the middle shaft 100 to rotate.
[0045] The shaft sleeve 200 is sleeved on the outer side of the middle shaft 100 and can move along the middle shaft 100. After the sprocket 300 is fixed on the shaft sleeve 200, the sprocket 300 can move along the middle shaft 100, so as to adjust the relative position of the sprocket 300 and the middle shaft 100. The shaft sleeve 200 is fixedly arranged in the circumferential direction with the middle shaft 100, so that when the middle shaft 100 rotates, the shaft sleeve 200 can be driven to rotate, thereby driving the sprocket 300 to rotate.
[0046] In addition, the length of the shaft sleeve 200 can be flexibly adjusted according to actual needs, for example, as shown in Figure 3 the design length is longer, the shaft sleeve 200 can be extended to between the middle shaft 100 and the bearing system for mounting the middle shaft 100, and the design length is shorter, the shaft sleeve 200 can not be extended to between the middle shaft 100 and the bearing system for mounting the middle shaft 100, and the whole is kept outside the bearing system. It should be noted that the shaft sleeve 200 has advantages of long and short, and in the case that the demand for moving drive of the chainring 300 is small, the shaft sleeve 200 with shorter length can be considered.
[0047] The driving mechanism 400 can drive the shaft sleeve 200 to move, thereby adjusting the relative position of the chainring 300 and the middle shaft 100, and adjusting the relative position between the chainring 300 and the freewheel 1000, so as to adjust the included angle between the chain and the chainring 300. The above-mentioned driving mechanism 400 can be arranged in the middle shaft 100, or arranged outside the middle shaft 100, for example, arranged on the frame 800, and the specific arrangement position can be flexibly adjusted according to actual needs, as long as the driving shaft sleeve 200 can be moved.
[0048] The above-mentioned driving mechanism 400 is a mechanism for active adjustment, and therefore, the movement of the shaft sleeve 200 can be limited, that is, the shaft sleeve 200 will not move passively due to the traction of the chain, and the riding stability is improved.
[0049] In the utility model, the movable shaft sleeve 200 is arranged on the middle shaft 100, and the chainring 300 is arranged on the shaft sleeve 200, and then the chainring 300 on the shaft sleeve 200 is driven to move along the axial direction of the middle shaft 100 by the driving mechanism 400, finally, when the gear position of the freewheel 1000 of the bicycle changes, the driving mechanism 400 is used to drive the chainring 300 to adaptively adjust the position according to the change of the gear position of the bicycle, so that the included angle between the chain and the chainring 300 and the included angle between the chain and the freewheel 1000 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 chainring or the freewheel 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, thereby the deformation of the tooth part is reduced, thereby the service life is prolonged. In addition, compared with the movement of the chainring 300 driven by the chain when the gear position of the freewheel 1000 changes, the chainring 300 is actively driven to move by the driving mechanism 400, the movement of the chainring 300 is smoother and more accurate, the jamming phenomenon can be reduced, and after the chainring 300 moves to the corresponding position, the chainring 300 will not move randomly, thereby the riding stability is improved.
[0050] It should be noted that the gear 300 can stop at multiple positions when moving along the axial direction of the middle shaft 100, for example, three positions, and the gear 300 on the two sides can correspond to multiple positions on the two sides of the flywheel 1000, and the gear 300 in the middle can correspond to multiple positions in the middle of the flywheel 1000.
[0051] It can be understood that the driving mechanism 400 can be a mechanical driving mechanism or an electric driving mechanism. When the driving mechanism 400 is a mechanical driving mechanism, the driving mechanism 400 can be connected to an external manual operating device, and then the manual direct control operation can be realized, and the driving shaft sleeve 200 can be moved to a position, and the user can adjust the position according to the riding feeling. When the driving mechanism 400 is an electric driving mechanism, the driving mechanism 400 can also be connected to an external manual operating device, and in addition, an electric control module 406 can be arranged in the driving mechanism 400, and the electric control module 406 can be used to automatically adjust the position of the shaft sleeve 200, so that the gear 300 is always in an optimal relative position with the flywheel 1000.
[0052] In some embodiments of the utility model, as shown in Figure 3 and Figure 4 The driving mechanism 400 includes a lead screw 401, a connecting piece 402 and a driving part 403, the lead screw 401 is rotatably installed on the middle shaft 100 or the frame 800 and extends along the axial direction of the middle shaft 100, the connecting piece 402 is provided with a threaded hole and is threadedly connected to the lead screw 401 through the threaded hole, the connecting piece 402 is connected to the shaft sleeve 200 and / or the gear 300, and the driving part 403 is connected to the lead screw 401 and is used to drive the lead screw 401 to rotate and drive the connecting piece 402 to move along the axial direction of the middle shaft 100, so that the shaft sleeve 200 moves along the axial direction of the middle shaft 100.
[0053] For example, the lead screw 401 can be installed in the middle shaft 100 or outside the middle shaft 100, for example, on the frame 800. The connecting piece 402 can be a nut or other structure provided with a threaded hole. The connecting piece 402 is threadedly connected to the lead screw 401 through the cooperation of the internal thread of the threaded hole and the external thread of the lead screw 401. The connecting piece 402 can be connected to the shaft sleeve 200 or the gear 300, or both.
[0054] The driving part 403 can be various, for example, can be a servo motor, when the driving part 403 is a servo motor, a power supply 404, a speed reducer 405 and an electric control module 406 and the like can be installed in the middle shaft 100, the power supply 404 supplies power to the driving part 403, the speed reducer 405 is installed between the driving part 403 and the lead screw 401, and the electric control module 406 controls in real time. In addition, when the lead screw 401 is rotatably installed on the frame 800, the driving part 403 can also be other structures, for example, it can be a clutch arranged between the lead screw 401 and the middle shaft 100, when the driving sleeve 200 does not need to move, the clutch controls the lead screw 401 and the middle shaft 100 to be disconnected, when the driving sleeve 200 needs to move, the clutch controls the lead screw 401 and the middle shaft 100 to be connected, when the middle shaft 100 rotates, the lead screw 401 can be controlled to rotate synchronously, thereby driving the sleeve 200 to move.
[0055] In the embodiment, the driving part 403 is operated, the lead screw 401 is controlled to rotate, the lead screw 401 drives the connecting piece 402 to move along the axial direction of the middle shaft 100 through the thread cooperation between the lead screw 401 and the connecting piece 402, the connecting piece 402 drives the sleeve 200 to move along the axial direction of the middle shaft 100, thereby adjusting the position of the sleeve 200, achieving the purpose of adjusting the relative position of the chainring 300 and the flywheel 1000, and being simple and convenient to operate. Moreover, through the driving mode, the position of the sleeve 200 can be accurately controlled, and the movement of the sleeve 200 can also be limited, so that the sleeve 200 cannot be passively moved under the traction of the chain, and the stability of riding is improved.
[0056] It should be noted that the driving mechanism 400 can also be other structures, for example, it can be an electric push rod, and the movement of the sleeve 200 is controlled through the extension and retraction of the electric push rod.
[0057] In some embodiments of the utility model, as shown in Figure 4 The middle shaft 100 is provided with an installation cavity 101, the driving mechanism 400 is installed in the installation cavity 101, the outer peripheral wall of the middle shaft 100 is provided with a gap slot 102 communicating with the installation cavity 101, the gap slot 102 extends along the axial direction of the middle shaft 100, and the connecting piece 402 is arranged in the gap slot 102.
[0058] For example, the installation cavity 101 can extend along the axial direction of the middle shaft 100, when the driving part 403 is a servo motor, the installation cavity 101 can be divided into two parts, including a first cavity and a second cavity, the first cavity can be arranged away from the chainring 300, and the second cavity can be arranged close to the chainring 300, the servo motor, the speed reducer 405, the power supply 404 and the electric control module 406 and the like can be arranged in the first cavity, and the lead screw 401 and the connecting piece 402 can be arranged in the second cavity.
[0059] The outer peripheral wall of the middle shaft 100 is provided with a clearance slot 102 on the side close to the shaft sleeve 200, the clearance slot 102 is connected with the mounting cavity 101, the clearance slot 102 can be provided in a strip shape, and the length direction is consistent with the axial direction of the middle shaft 100, so that the connecting piece 402 is connected with the shaft sleeve 200, and the connecting piece 402 can be guided, and the connecting piece 402 slides along the axial direction of the middle shaft 100. Meanwhile, the clearance slot 102 can effectively prevent the relative rotation of the shaft sleeve 200 and the middle shaft 100.
[0060] The above-mentioned clearance slot 102 can be provided on the side of the outer peripheral wall of the middle shaft 100 close to the shaft sleeve 200, and the clearance slot 102 can be provided in a strip shape, and the length direction is consistent with the axial direction of the middle shaft 100, so that the connecting piece 402 is connected with the shaft sleeve 200, and the connecting piece 402 can be guided, and the connecting piece 402 slides along the axial direction of the middle shaft 100. Meanwhile, the clearance slot 102 can effectively prevent the relative rotation of the shaft sleeve 200 and the middle shaft 100. Figure 4 As shown in the figure, the middle shaft 100 is provided with two clearance slots 102, and the upper part and the lower part of the inner wall of the shaft sleeve 200 are connected with the connecting piece 402 through the clearance slots 102.
[0061] In the embodiment, the mounting cavity 101 is arranged, which can not only protect the driving mechanism 400 and avoid damage caused by exposure of the driving mechanism 400, but also make the driving mechanism 400 closer to the axis of the middle shaft 100, so that the centrifugal force is smaller, and the resistance to the rotation of the middle shaft 100 is smaller, so that the rotation of the middle shaft 100 is smoother, and the riding efficiency of the bicycle user can be further improved.
[0062] In some embodiments of the utility model, as shown in the figure, Figure 4 As shown in the figure, the screw rod 401 is coaxial with the middle shaft 100. That is, the axis of the screw rod 401 coincides with the axis of the middle shaft 100, so that the centrifugal force generated when the middle shaft 100 rotates is smaller, and the resistance to the rotation of the middle shaft 100 is smaller, so that the rotation of the middle shaft 100 is smoother, and the riding efficiency of the bicycle user can be further improved.
[0063] In some embodiments of the utility model, as shown in the figure, Figure 4 As shown in the figure, the tooth disc assembly further comprises a first bearing 500 and a second bearing 600, the first bearing 500 is sleeved on the outer side of the end of the middle shaft 100 away from the tooth disc 300 and axially limits the middle shaft 100, the second bearing 600 is sleeved on the outer side of the middle shaft 100 and is located between the tooth disc 300 and the first bearing 500, and the first bearing 500 and the second bearing 600 are used to rotatably install the middle shaft 100.
[0064] In the embodiment, the rotation of the middle shaft 100 can be realized by using the first bearing 500 and the second bearing 600, and the rotation demand of the middle shaft 100 is met. Meanwhile, in the embodiment, the first bearing 500 has a limiting function, so that the middle shaft 100 does not move when the shaft sleeve 200 moves.
[0065] When the aforementioned first bearing 500 is used to restrict the axial movement of the central shaft 100, it can be engaged by providing a limiting protrusion 103 on the outer peripheral wall of the central shaft 100, such as... Figure 4 As shown, a limiting protrusion 103 is provided on the outer peripheral wall of the central shaft 100, 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, 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.
[0066] In some embodiments of this utility model, such as Figure 4 As shown, a first locking plug 502 is provided on the side of the first bearing 500 away from the bushing 200 on the frame 800 or assembly seat 700. The first locking plug 502 is located on the outer periphery of the axial locking structure 501 to fix the first bearing 500. A second locking plug 601 can be provided on the side of the second bearing 600 away from the first bearing 500 on the frame 800 or assembly seat 700. The second locking plug 601 can be located on the outer side of the bushing 200 to fix the second bearing 600.
[0067] 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.
[0068] 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.
[0069] It should be noted that the first bearing 500 can also be other suitable types of bearings, which will not be elaborated here.
[0070] In some embodiments of this utility model, such as Figure 4As shown, the second bearing 600 is arranged as a needle bearing, and is sleeved outside the shaft sleeve 200, and the shaft sleeve 200 can move relative to the second bearing 600 along the axial direction of the middle shaft 100. For example, the second bearing 600 can be an inner ringless needle bearing, and the end of the shaft sleeve 200 away from the tooth disc 300 can extend into the second bearing 600 as the inner ring of the second bearing 600.
[0071] In the embodiment, the shaft sleeve 200 extends into the second bearing 600 and can rotate relative to the second bearing 600, thereby reducing the circumferential friction on the outer circumferential wall of the shaft sleeve 200, making the rotation of the shaft sleeve 200 more smooth, thereby improving the riding efficiency. In addition, since the second bearing 600 is arranged as a needle bearing, the shaft sleeve 200 can move relative to the second bearing 600 along the axial direction of the middle shaft 100, thereby reducing the axial friction on the outer circumferential wall of the shaft sleeve 200, making the movement of the shaft sleeve 200 along the axial direction of the middle shaft 100 more smooth, and the shifting of the tooth disc 300 more smooth. In addition, the end of the shaft sleeve 200 away from the tooth disc 300 can extend into the second bearing 600, thereby not only making the movement path of the shaft sleeve 200 wider, thereby making the adjustment range of the tooth disc 300 along the axial direction of the middle shaft 100 larger, but also making the shaft sleeve 200 longer along the axial direction of the middle shaft 100, thereby not only making the structural strength of the shaft sleeve 200 higher, but also making the stability of the shaft sleeve 200 better, and reducing the shaking of the tooth disc 300, thereby further improving the riding experience.
[0072] It should be noted that the second bearing 600 can also be other suitable types of bearings, which will not be described here.
[0073] In some embodiments of the present application, as shown in Figure 3 and Figure 4 As shown, the tooth disc assembly further comprises an assembly seat 700, the assembly seat 700 is arranged on the frame 800 in a detachable manner, and the middle shaft 100 is rotatably installed in the assembly seat 700.
[0074] By arranging the middle shaft 100 in the assembly seat 700, the entire tooth disc assembly can be arranged as an assembly structure, thereby the assembly seat 700 can realize the quick installation and replacement of the entire tooth disc assembly, and provide better use experience for the user.
[0075] It should be noted that the assembly seat 700 can be clamped on the frame 800 or installed on the frame 800 by fasteners.
[0076] In some embodiments of the present application, as shown in Figure 4As 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.
[0077] 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.
[0078] 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.
[0079] The bicycle according to a second aspect embodiment of the present invention includes the chainring assembly described in the first aspect embodiment.
[0080] The bicycle according to the embodiments of this utility model, by employing the chainring assembly of the first aspect of this utility model, not only improves the riding efficiency of the cyclist but also reduces issues such as chain slippage, asymmetrical wear of the teeth, and tooth deformation, thereby improving the cyclist's riding experience and extending the bicycle's service life. Furthermore, compared to the chain-driven chainring 300 movement during gear shifting on the freewheel 1000, this application actively drives the chainring 300 through the drive mechanism 400. The chainring 300 movement is smoother and more precise, reducing the occurrence of jamming, and once moved to the corresponding position, it does not move arbitrarily, improving riding stability.
[0081] It should be noted that since the bicycle can adopt all the technical solutions of the chainring assembly of the first aspect embodiment, it has at least all the beneficial effects brought about by the technical solutions of the first aspect embodiment. These additional beneficial effects will not be elaborated here.
[0082] It can be understood that other configurations and operations of the bicycle according to the embodiments of the present application are known to those skilled in the art, and will not be described in detail here.
[0083] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the spirit of the present application.
Claims
1. A pallet assembly, comprising: The utility model relates to a tooth disc assembly, comprising: a middle shaft for rotatably mounting to a frame; a shaft sleeve sleeved on the middle shaft and movable along the axial direction of the middle shaft, the shaft sleeve being fixed relative to the middle shaft in the circumferential direction; a tooth disc provided on the shaft sleeve; a driving mechanism for driving the shaft sleeve to move along the axial direction of the middle shaft.
2. The pallet assembly of claim 1, wherein, The driving mechanism comprises: a screw rod rotatably mounted to the middle shaft or the frame and extending along the axial direction of the middle shaft; a connecting piece provided with a threaded hole and threadedly connected to the screw rod through the threaded hole, the connecting piece being connected to the shaft sleeve and / or the tooth disc; a driving part connected to the screw rod for driving the screw rod to rotate and drive the connecting piece to move along the axial direction of the middle shaft, so that the shaft sleeve moves along the axial direction of the middle shaft.
3. The tray assembly of claim 2, wherein, The middle shaft is provided with a mounting cavity, the driving mechanism is mounted in the mounting cavity, the outer circumferential wall of the middle shaft is provided with a clearance slot communicating with the mounting cavity, the clearance slot extends along the axial direction of the middle shaft, and the connecting piece passes through the clearance slot.
4. The tray assembly of claim 3, wherein, The screw rod is coaxial with the middle shaft.
5. The tray assembly of claim 1, wherein, The tooth disc assembly further comprises: a first bearing sleeved on the end of the middle shaft away from the tooth disc and axially limiting the middle shaft; a second bearing sleeved on the middle shaft and located between the tooth disc and the first bearing; The first bearing and the second bearing are used for rotatably mounting the middle shaft.
6. The tray assembly of claim 5, wherein, The second bearing is a needle bearing and is sleeved on the shaft sleeve, and the shaft sleeve is movable relative to the second bearing along the axial direction of the middle shaft.
7. The tray assembly of claim 1, wherein, The tooth disc assembly further comprises: an assembly seat for detachably mounting to the frame, and the middle shaft is rotatably mounted to the assembly seat.
8. The pallet assembly of claim 1, wherein, The length of the shaft sleeve along the axial direction thereof is 1.2 to 3 times the moving stroke of the shaft sleeve.
9. The pallet assembly of claim 1, wherein, A key structure is mounted between the middle shaft and the shaft sleeve, and the relative rotation between the middle shaft and the shaft sleeve is limited by the key structure.
10. A bicycle characterized in that, The utility model relates to a tooth disc assembly, comprising: any one of claims 1 to 9.