Chain wheel device and bicycle
By incorporating movable bushings and telescopic mechanisms into the bicycle, the position of the chainring can be adjusted, thus solving the angle problem during gear shifting in multi-speed bicycles, improving riding efficiency and stability, and extending the bicycle's lifespan.
Patent Information
- Application Number
- CN202520427148.7
- 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
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 of the teeth, and tooth deformation, which affect 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 along the bottom bracket axis to adjust the position of the chainring, thereby reducing the angle between the chain and the chainring and freewheel. The telescopic mechanism actively drives the chainring to move, improving riding efficiency and stability.
It effectively reduces the angle between the chain and the chainring/freewheel, reduces chain slippage and tooth wear, extends the life of the bicycle, improves riding efficiency and stability, and is easy to install while avoiding damage to the telescopic mechanism.
Smart Images
Figure CN223812685U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a bicycle technical field, in particular to a tooth disc device and bicycle. BACKGROUND
[0002] As an important component of the derailleur bicycle, the performance of the derailleur system has an important influence on the performance of the derailleur bicycle. In the related art, when the derailleur bicycle shifts gears, the chain will wrap around the different levels of the freewheel, and then the angle between the chain and the tooth disc and the chain and the freewheel will change. As long as the angle is not zero degrees, the driving force of the chain will be separated axially due to the existence of the angle, and the freewheel cannot be driven to rotate with full force, which affects the riding efficiency. At the same time, it is also easy to cause the gear shifting to be not smooth, and to cause the chain to fall back, the tooth part to be asymmetrically worn, and the tooth part to be deformed, which not only affects the riding experience, but also shortens the service life of the bicycle. SUMMARY
[0003] The utility model aims at at least solving one of the technical problems existing in the prior art. Therefore, the utility model provides a tooth disc device, which can not only improve the riding efficiency of the user, but also reduce the chain falling back, the tooth part being asymmetrically worn, and the tooth part being deformed, 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 device.
[0005] According to the tooth disc device of the first aspect of the utility model, the middle shaft is used for rotating installation 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 relatively fixed in the circumferential direction of the middle shaft, the tooth disc is arranged on the shaft sleeve, and the telescopic mechanism is arranged in the middle shaft and 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.
[0006] According to the tooth disc device of the utility model, at least the following beneficial effects are achieved:
[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 freewheel of the bicycle is carried out, the telescopic drive shaft sleeve is moved along the axial direction of the middle shaft by telescopic mechanism, 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 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, the deformation of the tooth part is reduced, and the service life is prolonged. In addition, compared with the movement of the tooth disc driven by the chain when the freewheel is shifted, the tooth disc is actively driven to move by the telescopic mechanism, the movement of the tooth disc is smoother and more accurate, the phenomenon of jamming 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 telescopic mechanism is arranged in the middle shaft, so that the telescopic mechanism is not exposed and damaged, and the telescopic mechanism can be installed in the frame when the middle shaft is installed, so that the installation is more convenient.
[0008] According to some embodiments of the utility model, the tooth disc device further includes an assembly seat, the assembly seat is used for being installed on the frame, the assembly seat is provided with a mounting hole, 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 is extended into the clearance cavity.
[0009] According to some embodiments of the utility model, the tooth disc device 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 middle shaft is provided with a mounting cavity, the telescopic mechanism is installed in the mounting cavity, the outer peripheral wall of the middle shaft is provided with a clearance slot communicating with the mounting cavity, the telescopic mechanism is provided with a connecting piece, the connecting piece is arranged in the clearance slot and connected to the shaft sleeve and / or the tooth disc.
[0012] According to some embodiments of the utility model, the telescopic mechanism is a hydraulic cylinder or a pneumatic cylinder, and the tooth disc device further includes:
[0013] A first medium conveying pipe is connected to the telescopic mechanism.
[0014] A second medium conveying pipe is rotatably connected with the first medium conveying pipe, and the second medium conveying pipe is used for connecting a driving unit.
[0015] According to some embodiments of the utility model, the tooth disc device further comprises:
[0016] An assembly seat is used for being mounted on the frame, the assembly seat is provided with a mounting hole, the middle shaft is rotatably mounted in the mounting hole, the first medium conveying pipe is arranged in the middle shaft, the second medium conveying pipe is arranged in the assembly seat, a rotary joint is arranged on the outer side of the middle shaft, and the first medium conveying pipe is connected with the second medium conveying pipe through the rotary joint.
[0017] According to some embodiments of the utility model, the length dimension of the shaft sleeve along the axial direction of the shaft sleeve is 1.2 to 3 times of the moving stroke of the shaft sleeve.
[0018] According to some embodiments of the utility model, the tooth disc structure further comprises a position detection unit, an electric control module and a display unit, the position detection unit is used for acquiring the position of the tooth disc on the middle shaft, the electric control module is electrically connected with the position detection unit, and the display unit is arranged on the frame and electrically connected with the electric control module.
[0019] According to some embodiments of the utility model, a key structure is arranged between the middle shaft and the shaft sleeve, and the relative rotation of the middle shaft and the shaft sleeve is limited through the key structure.
[0020] The bicycle according to the second aspect of the utility model comprises the tooth disc device according to the first aspect of the utility model.
[0021] The bicycle according to the utility model has at least the following beneficial effects:
[0022] The tooth disc device according to the first aspect of the utility model not only improves the riding efficiency of the bicycle user, but also reduces the wear of the back-off chain, the asymmetric tooth part and the deformation of the tooth part, thereby improving the riding experience of the bicycle user and prolonging the service life of the bicycle. In addition, compared with the movement of the tooth disc driven by the chain during the gear shifting of the freewheel, the tooth disc is actively driven to move through the extension and retraction of the extension and retraction mechanism, the movement of the tooth disc is smoother and more accurate, the phenomenon of jamming is reduced, and after the tooth disc moves to the corresponding position, the tooth disc will not move randomly, thereby improving the stability of the riding. In addition, the extension and retraction mechanism is arranged in the middle shaft, damage of the extension and retraction mechanism caused by exposure can be avoided, and the extension and retraction mechanism can be installed on the frame when the middle shaft is installed, thereby improving the convenience of installation.
[0023] The additional aspects and advantages of the present application will be given partly in the following description, and some additional aspects and advantages will become apparent from the following description or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS
[0024] The present application will be further described below in conjunction with the drawings and embodiments, in which:
[0025] Figure 1 is a schematic view of cooperation of a traditional tooth disc and a flywheel;
[0026] Figure 2 is a schematic view of cooperation of a tooth disc and a flywheel of the present application;
[0027] Figure 3 is a schematic view of overall structure of the tooth disc device of the present application;
[0028] Figure 4 is a partial sectional view of the tooth disc device of the present application;
[0029] Figure 5 is an electrical system diagram of the tooth disc device of the present application.
[0030] LIST OF ELEMENTS:
[0031] central shaft 100; mounting cavity 101; clearance groove 102; limiting protrusion 103;
[0032] shaft sleeve 200;
[0033] tooth disc 300;
[0034] telescopic mechanism 400; connecting piece 401;
[0035] first bearing 500; axial locking structure 501; first locking plug 502; first sealing ring 503;
[0036] second bearing 600; second locking plug 601; second sealing ring 602;
[0037] assembly seat 700; mounting hole 701; clearance cavity 702;
[0038] vehicle frame 800;
[0039] first medium conveying pipe 900; second medium conveying pipe 901; driving unit 902; rotary joint 903;
[0040] crank connecting shaft 1000;
[0041] flywheel 1100;
[0042] Position detection unit 1201; electric control module 1202; display unit 1203; power storage unit 1204; wireless communication module 1205. DETAILED DESCRIPTION
[0043] The embodiments of the present application are described below in detail, 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 reference to the drawings are exemplary only, and are for the purpose of explaining the present application, and should not be understood as a limitation of the present application.
[0044] 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, which 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 referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be understood as a limitation of the present application.
[0045] In the description of the present application, the plural refers to two or more. If there is a description of first, second, etc. for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implying the number of technical features indicated or the sequence of technical features indicated.
[0046] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, 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 solution.
[0047] In order to better describe the tooth disc device and the bicycle of the embodiments of the present application, the change of the angle between the chain and the tooth disc 300 in the traditional bicycle gear adjustment process is briefly described here. Referring to Figure 1 , the chain is in the highest gear of the freewheel 1100, that is, the highest gear ratio, at this time, there is a large included angle θ between the chain and the tooth disc 300, because of the existence of the θ angle, the driving force of the chain will have a large axial component which cannot be used to drive the freewheel 1100 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 in FIG. 10 can be understood as the position of the tooth disc 300 before moving, and the solid rectangular frame can be understood as the position of the tooth disc 300 after moving, and the included angle after moving is β, which is obviously smaller than θ, thereby effectively reducing the axial component.
[0048] The following refers toFigures 3 to 5 The utility model discloses a toothed disc device and a bicycle.
[0049] As Figure 3 and Figure 4 The toothed disc device according to the first aspect of the utility model comprises a middle shaft 100, a shaft sleeve 200, a toothed disc 300 and an extension mechanism 400.
[0050] The middle shaft 100 is rotatably installed on a 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 fixed relative to the middle shaft 100 in the circumferential direction, the toothed disc 300 is arranged on the shaft sleeve 200, and the extension mechanism 400 is arranged in the middle shaft 100 and connected to the shaft sleeve 200 and / or the toothed disc 300, so that the shaft sleeve 200 moves along the axial direction of the middle shaft 100 through the extension of the extension mechanism 400.
[0051] For example, the middle shaft 100 can be installed on the frame 800 through an assembly seat 700, specifically, the assembly seat 700 can be provided with a bearing system, and the middle shaft 100 is installed on the bearing system to realize the rotation of the middle shaft 100. In addition, the two ends of the middle shaft 100 can be provided with crank connecting shafts 1000 for connecting cranks, and the cranks are used for installing pedals, and a bicycle user rotates the cranks through the pedals, and then drives the middle shaft 100 to rotate.
[0052] The shaft sleeve 200 is sleeved on the outer side of the middle shaft 100 and can move along the middle shaft 100, and after the toothed disc 300 is fixed on the shaft sleeve 200, the toothed disc 300 can move along the middle shaft 100, so that the relative position of the toothed disc 300 and the middle shaft 100 is adjusted. The shaft sleeve 200 is fixed relative to the middle shaft 100 in the circumferential direction, so that when the middle shaft 100 rotates, the shaft sleeve 200 can be driven to rotate, and the toothed disc 300 is driven to rotate.
[0053] In addition, the length of the shaft sleeve 200 can be flexibly adjusted according to actual needs, for example, as Figure 4 shown, when the designed length is longer, the shaft sleeve 200 can be extended to between the middle shaft 100 and the bearing system for installing the middle shaft 100, and when the designed length is shorter, the shaft sleeve 200 can not be extended to between the middle shaft 100 and the bearing system for installing 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 driving demand of the toothed disc 300 is small, the shaft sleeve 200 with a shorter length can be considered.
[0054] The telescopic mechanism 400 is installed in the middle shaft 100, and the telescopic mechanism 400 can be connected to the shaft sleeve 200, can be connected to the tooth disc 300, or can be connected to both the shaft sleeve 200 and the tooth disc 300. The telescopic direction of the telescopic mechanism 400 can be the axial direction of the middle shaft 100 or slightly deviate from the axial direction of the middle shaft 100, and the telescopic mechanism 400 can drive the shaft sleeve 200 to move by telescoping, and then the relative position of the tooth disc 300 and the middle shaft 100 can be adjusted, and then the relative position between the tooth disc 300 and the freewheel 1100 can be adjusted, so that the included angle between the chain and the tooth disc 300 is adjusted.
[0055] The telescopic mechanism 400 is an active adjustment mechanism, so 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.
[0056] In the utility model, the movable shaft sleeve 200 is arranged on the middle shaft 100, and the tooth disc 300 is arranged on the shaft sleeve 200, when the gear position of the freewheel 1100 of the bicycle is changed, the telescopic mechanism 400 is used to drive the shaft sleeve 200 to move along the axial direction of the middle shaft 100, and then the tooth disc 300 is driven 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 tooth disc 300 and the included angle between the chain and the freewheel 1100 are effectively reduced, and the riding efficiency of the bicycle user is improved.
[0057] In addition, because the included angle is small, the meshing cutting range of the chain and the tooth part of the tooth disc or the freewheel is wider, the chain can be prevented from falling off, the asymmetric wear of the tooth part is reduced, the axial stress of the tooth part is reduced, and then the deformation of the tooth part is reduced, so that the service life is prolonged. In addition, compared with the movement of the tooth disc 300 driven by the chain when the gear position of the freewheel 1100 is changed, the tooth disc 300 is actively driven to move by the telescopic mechanism 400, the movement of the tooth disc 300 is smoother and more accurate, the jamming phenomenon can be reduced, and after the tooth disc 300 moves to the corresponding position, the tooth disc 300 will not move randomly, and the riding stability is improved. In addition, the telescopic mechanism 400 is installed in the middle shaft 100, the telescopic mechanism 400 can be prevented from being damaged due to exposure, and the telescopic mechanism 400 can be installed in the frame 800 when the middle shaft 100 is installed, and the installation is more convenient.
[0058] It should be noted that the gear positions at which the tooth disc 300 moves along the axial direction of the middle shaft 100 can be multiple, for example, three, and the gear positions of the tooth discs on both sides can correspond to multiple gear positions on both sides of the freewheel 1100, and the gear position of the tooth disc in the middle can correspond to multiple gear positions in the middle of the freewheel 1100.
[0059] In some embodiments of the utility model, for example, Figure 3 andFigure 4 As shown, the tooth disc device can further include an assembly seat 700 configured to be mounted on the frame 800, the assembly seat 700 is provided with a mounting hole 701, the middle shaft 100 is rotatably mounted in the mounting hole 701, and a clearance cavity 702 is formed between the hole wall of the mounting hole 701 and the outer peripheral wall of the middle shaft 100, and the shaft sleeve 200 extends into the clearance cavity 702.
[0060] For example, the assembly seat 700 can be detachably arranged on the frame 800, for example, the assembly seat 700 can be clamped on the frame 800 or mounted on the frame 800 by fasteners. The assembly seat 700 is provided with a mounting hole 701 extending in the horizontal direction, and both ends of the mounting hole 701 can be provided through. The middle shaft 100 can be arranged in the mounting hole 701 through a bearing system to realize the rotation of the middle shaft 100, and the outer diameter of the middle shaft 100 can be smaller than the hole diameter of the mounting hole 701 near the tooth disc 300, so that a clearance cavity 702 is formed between the hole wall of the mounting hole 701 and the outer peripheral wall of the middle shaft 100. The shaft sleeve 200 can be partially arranged in the clearance cavity 702 when the shaft sleeve 200 moves to any position along the axial direction of the middle shaft 100; the shaft sleeve 200 can also be partially arranged in the clearance cavity 702 when the shaft sleeve 200 moves to a position close to the assembly seat 700, and the shaft sleeve 200 is arranged outside one end of the assembly seat 700 when the shaft sleeve 200 moves to a position away from the assembly seat 700. The specific length of the shaft sleeve 200 can be flexibly adjusted according to actual needs, which will not be described here.
[0061] In this embodiment, the entire tooth disc device can be arranged as an assembly structure, and the entire tooth disc device can be quickly mounted and replaced through the assembly seat 700 to provide better user experience. In addition, compared with the shaft sleeve 200 which can only move back and forth outside one end of the assembly seat 700, in this application, the clearance cavity 702 is formed between the hole wall of the mounting hole 701 and the outer peripheral wall of the middle shaft 100, and the shaft sleeve 200 can extend into the clearance cavity 702, so that not only the moving path of the shaft sleeve 200 is longer, thereby making the adjustment range of the tooth disc 300 along the axial direction of the middle shaft 100 larger, but also the shaft sleeve 200 can extend longer along the axial direction of the middle shaft 100, thereby making the structure of the shaft sleeve 200 stronger, and the installation stability of the shaft sleeve 200 better, which can reduce the shaking of the tooth disc 300, thereby further improving the riding experience.
[0062] It can be understood that if the shaft sleeve 200 can only move back and forth at one end of the assembly seat 700, not only the moving path of the shaft sleeve 200 is short, but also in order to enable the shaft sleeve 200 to move in the axial direction of the shaft 100 by a displacement, the length of the shaft sleeve 200 can only be set to be short because the distance between the end of the shaft 100 and the assembly seat 700 is certain, so that the structure strength is low, the stability is poor, the tooth disc 300 is easy to shake, and the riding experience is affected, and in the application, the accommodation cavity 702 for the shaft sleeve 200 to extend into is formed between the hole wall of the mounting hole 701 and the outer peripheral wall of the shaft 100, and the above problems can be effectively solved.
[0063] In some embodiments of the utility model, as shown in Figure 4 The tooth disc 300 can be installed at the end of the shaft sleeve 200 away from the assembly seat 700, and when the shaft sleeve 200 moves in the axial direction of the shaft 100 to any position, the end of the shaft sleeve 200 away from the tooth disc 300 is located in the accommodation cavity 702.
[0064] In the embodiment, the shaft sleeve 200 extends in the axial direction of the shaft 100 longer, and the structure strength of the shaft sleeve 200 is higher, the installation stability of the shaft sleeve 200 is better, the tooth disc 300 is less likely to shake, and the riding experience is further improved, and the shaft sleeve 200 is prevented from interfering with the assembly seat 700 when entering the accommodation cavity 702, so that the shaft sleeve 200 moves more smoothly.
[0065] In some embodiments of the utility model, as shown in Figure 4 The tooth disc mechanism further comprises 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 tooth disc 300, the second bearing 600 is installed in the end of the mounting hole 701 close to the tooth disc 300, and the shaft 100 is installed in the first bearing 500 and the second bearing 600.
[0066] In the embodiment, the rotation of the shaft 100 can be realized by using the first bearing 500 and the second bearing 600, the rotation demand of the shaft 100 is met, and the rotation of the shaft 100 is more smooth.
[0067] In some embodiments of the utility model, as shown in Figure 4As shown in the figure, a limiting bump 103 is arranged on the outer peripheral wall of the middle shaft 100 and on the side of the first bearing 500 close to the shaft sleeve 200 to provide a restriction in one direction, while an axial locking structure 501 is arranged on the outer peripheral wall of the middle shaft 100 and on the side of the first bearing 500 away from the shaft sleeve 200, so as to realize the restriction of the first bearing 500 in the other direction, and at the same time, the restriction of the movement of the middle shaft 100 in the axial direction is also completed. For example, the axial locking structure 501 can be an axial locking nut, and the outer peripheral wall of the end of the middle shaft 100 away from the shaft sleeve 200 can be provided with external threads, and the axial locking nut is threadedly connected with the middle shaft 100, of course, the axial locking structure 501 can also be a locking ring, and the outer peripheral wall of the end of the middle shaft 100 away from the shaft sleeve 200 can be provided with a snap ring, and the axial locking is arranged in the snap ring.
[0068] In some embodiments of the utility model, as shown in the figure, Figure 4 As shown in the figure, a first locking screw plug 502 is arranged on the assembly seat 700 or the frame 800 on the side of the first bearing 500 away from the shaft sleeve 200, and the first locking screw plug 502 is located on the outer peripheral side of the axial locking structure 501 to realize the fixation of the first bearing 500. A second locking screw plug 601 can be arranged on the assembly seat 700 or the frame 800 on the side of the second bearing 600 away from the first bearing 500, and the second locking screw plug 601 can be located on the outer side of the shaft sleeve 200 to realize the fixation of the second bearing 600.
[0069] 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 arranged 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 shaft sleeve 200, a second sealing ring 602 can be arranged between the second locking screw plug 601 and the shaft sleeve 200.
[0070] In some embodiments of the utility model, the first bearing 500 can be a ball bearing. In this embodiment, by utilizing the strong axial bearing capacity of the ball bearing, the axial force during the movement of the tooth disc 300 can be better borne, and the middle shaft 100 can be better fixed through the ball bearing.
[0071] It should be noted that the first bearing 500 can also be other suitable types of bearings, which will not be described here.
[0072] In some embodiments of the utility model, as shown in the figure, 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 central 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.
[0073] 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 peripheral 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 central shaft 100, thereby reducing the axial friction on the outer peripheral wall of the shaft sleeve 200, making the shaft sleeve 200 move along the axial direction of the central shaft 100 more smoothly, and the shifting of the tooth disc 300 more smoothly. In addition, the shaft sleeve 200 can also support the second bearing 600, making the installation of the second bearing 600 more stable.
[0074] It should be noted that the second bearing 600 can also be other suitable types of bearings, which will not be described here.
[0075] In some embodiments of the utility model, as shown in Figure 3 and Figure 4 As shown, the central shaft 100 is provided with a mounting cavity 101, and the telescopic mechanism 400 is mounted in the mounting cavity 101. The outer peripheral wall of the central shaft 100 is provided with a displacement slot 102 communicating with the mounting cavity 101. The telescopic mechanism 400 is provided with a connecting piece 401, which is arranged in the displacement slot 102 and connected to the shaft sleeve 200 and / or the tooth disc 300.
[0076] For example, the mounting cavity 101 can extend along the axial direction of the central shaft 100. Taking the telescopic mechanism 400 as a hydraulic cylinder as an example, the mounting 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 tooth disc 300, and the second cavity can be arranged close to the tooth disc 300. The first cavity can be used to mount the cylinder body part of the hydraulic cylinder, and the second cavity can be used to accommodate the piston rod of the hydraulic cylinder and the connecting piece 401, etc.
[0077] The outer peripheral wall of the central shaft 100 is provided with a displacement slot 102 on the side close to the shaft sleeve 200. The displacement slot 102 is connected with the mounting cavity 101. The displacement slot 102 can be arranged in a strip shape, and the length direction is consistent with the axial direction of the central shaft 100, so that the connecting piece 401 is connected with the shaft sleeve 200 and / or the tooth disc 300, and at the same time, the connecting piece 401 can be guided and made to slide along the axial direction of the central shaft 100. At the same time, the arrangement of the displacement slot 102 can effectively prevent the relative rotation between the shaft sleeve 200 and the central shaft 100.
[0078] The above-mentioned accommodation slot 102 can be provided with multiple on the outer peripheral wall of the middle shaft 100 close to the shaft sleeve 200, and the multiple accommodation slots 102 can increase the connection stability between the connecting piece 401 and the shaft sleeve 200 and / or the tooth disc 300. Figure 4 As shown in the drawings, the middle shaft 100 is provided with two accommodation 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 401 through the accommodation slots 102.
[0079] In the embodiment, the installation cavity 101 is arranged, which not only can protect the telescopic mechanism 400 and avoid damage caused by exposure of the telescopic mechanism 400, but also can make the telescopic mechanism 400 closer to the axis of the middle shaft 100, so that the centrifugal force is smaller, the rotation of the middle shaft 100 is less hindered, the rotation of the middle shaft 100 is smoother, and the riding efficiency of the bicycle user can be further improved.
[0080] In some embodiments of the utility model, as shown in the drawings, the telescopic mechanism 400 is arranged as a hydraulic cylinder or a pneumatic cylinder. Figure 4 As an example, the telescopic mechanism 400 is an oil cylinder in the hydraulic cylinder, and the frame 800 can further be provided with an oil pump, an oil delivery pipe, an oil tank and the like. The oil pump is arranged between the oil tank and the oil cylinder through the oil delivery pipe, and the oil pump can control the sliding of the piston rod by injecting or extracting oil into or from the rodless cavity of the oil cylinder and injecting or extracting oil into or from the rod cavity of the oil cylinder, thereby realizing telescopic extension.
[0081] In the embodiment, the telescopic mechanism 400 is a hydraulic cylinder or a pneumatic cylinder, which has simple structure, convenient installation and good telescopic effect.
[0082] It should be noted that the telescopic mechanism 400 can also be other structures, for example, it can also be an electric push rod, which will not be described here.
[0083] In some embodiments of the utility model, as shown in the drawings, the tooth disc device further comprises a first medium conveying pipe 900 and a second medium conveying pipe 901. Figure 3 And Figure 4 As shown in the drawings, the tooth disc device further comprises a first medium conveying pipe 900 and a second medium conveying pipe 901, the first medium conveying pipe 900 is connected to the telescopic mechanism 400, the second medium conveying pipe 901 is rotationally connected with the first medium conveying pipe 900, and the second medium conveying pipe 901 is used for connecting a driving unit 902.
[0084] For example, the driving unit 902 can be installed on the frame 800 or the assembly seat 700, when the telescopic mechanism 400 is set as a hydraulic cylinder, the driving unit 902 can be a hydraulic pump, and a liquid storage tank or the like can also be arranged on the frame 800 or the assembly seat 700, when the telescopic mechanism 400 is set as a pneumatic cylinder, the driving unit 902 can be a gas pump. The telescopic mechanism 400 has a rodless cavity and a rod cavity, the first medium conveying pipe 900 can be two and respectively communicated with the rodless cavity and the rod cavity, the second medium conveying pipe 901 can be two and located outside the central shaft 100, the two second medium conveying pipes 901 are respectively rotationally connected with the two first medium conveying pipes 900, and the ends of the two second medium conveying pipes 901 away from the first medium conveying pipes 900 are connected to the driving unit 902.
[0085] In the embodiment, the driving unit 902 injects or extracts the driving medium such as oil into or from the rodless cavity of the telescopic mechanism 400 and injects or extracts the driving medium such as oil into or from the rod cavity of the telescopic mechanism 400 through the first medium conveying pipe 900 and the second medium conveying pipe 901, so as to control the sliding of the piston rod and further realize the telescoping of the telescopic mechanism 400, which is simple in structure and convenient to operate. In addition, the second medium conveying pipe 901 is rotationally connected with the first medium conveying pipe 900, so that when the first medium conveying pipe 900 rotates with the central shaft 100, the interference between the second medium conveying pipe 901 and the first medium conveying pipe 900 can be avoided, and the connectivity between the second medium conveying pipe 901 and the first medium conveying pipe 900 is better.
[0086] In some embodiments of the utility model, as shown in Figure 4 The tooth disc device further comprises an assembly seat 700, the assembly seat 700 is used for being installed on the frame 800, the assembly seat 700 is provided with a mounting hole 701, the central shaft 100 is rotationally installed in the mounting hole 701, the first medium conveying pipe 900 is arranged in the central shaft 100, the second medium conveying pipe 901 is arranged in the assembly seat 700, a rotary joint 903 is arranged outside the central shaft 100, and the first medium conveying pipe 900 is connected to the second medium conveying pipe 901 through the rotary joint 903.
[0087] For example, the first medium conveying pipe 900 can be arranged in the central shaft 100, the second medium conveying pipe 901 can be arranged in the assembly seat 700, the rotary joint 903 can be annular, the rotary joint 903 can comprise an inner sleeve and an outer sleeve, the inner sleeve and the outer sleeve can rotate relative to each other, an annular channel is formed between the inner sleeve and the outer sleeve, the inner sleeve can be fixedly connected to the central shaft 100 and connected to the first medium conveying pipe 900, the outer sleeve can be fixedly connected to the assembly seat 700 and connected to the second medium conveying pipe 901, and the first medium conveying pipe 900 and the second medium conveying pipe 901 are both communicated with the annular channel.
[0088] In the embodiment, the communication of the first medium conveying pipe 900 and the second medium conveying pipe 901 can be realized through the annular channel of the rotary joint 903, and the rotary joint 903 can realize the rotary connection of the second medium conveying pipe 901 and the first medium conveying pipe 900 due to the relative rotation of the inner sleeve and the outer sleeve, so that the structure is simple, the sealing performance is good, and the second medium conveying pipe 901 can be communicated with the first medium conveying pipe 900 when the middle shaft 100 rotates to any angle, and the practicability is better.
[0089] It should be noted that in other embodiments of the utility model, the second medium conveying pipe 901 and the first medium conveying pipe 900 can also be rotatably connected through other ways. For example, an annular groove can be arranged on the outer circumferential wall of the middle shaft 100, the annular groove is annularly arranged on the middle shaft 100 along the circumferential direction of the middle shaft 100, the hole wall of the mounting hole 701 of the assembly seat 700 covers the annular groove to form an annular channel, the first medium conveying pipe 900 and the second medium conveying pipe 901 are communicated with the annular channel, and the rotary connection of the second medium conveying pipe 901 and the first medium conveying pipe 900 can be realized. In addition, the hole wall of the mounting hole 701 of the assembly seat 700 can also be provided with an annular groove, the annular groove is annularly arranged on the middle shaft 100 along the circumferential direction of the middle shaft 100, the outer circumferential wall of the middle shaft 100 covers the annular groove to form an annular channel, the first medium conveying pipe 900 and the second medium conveying pipe 901 are communicated with the annular channel, and the rotary connection of the second medium conveying pipe 901 and the first medium conveying pipe 900 can also be realized. In addition, the outer circumferential wall of the middle shaft 100 and the hole wall of the mounting hole 701 of the assembly seat 700 can also be provided with annular grooves, the two annular grooves are abutted to form an annular channel, the first medium conveying pipe 900 and the second medium conveying pipe 901 are communicated with the annular channel, and the rotary connection of the second medium conveying pipe 901 and the first medium conveying pipe 900 can also be realized.
[0090] It can be understood that the first medium conveying pipe 900 can be directly arranged on the middle shaft 100, the second medium conveying pipe 901 can be directly arranged on the assembly seat 700, or a first medium conveying channel can be formed on the middle shaft 100, the first medium conveying channel is part of the structure of the first medium conveying pipe 900, a second medium conveying channel is formed on the assembly seat 700, and the second medium conveying channel is part of the structure of the second medium conveying pipe 901.
[0091] In some embodiments of the utility model, as shown in Figure 4As shown, the length of the sleeve 200 along its axial direction is 1.2 to 3 times of the moving stroke of the sleeve 200. For example, the length of the sleeve 200 along its axial direction can be 1.2 times, 2 times, 2.5 times, 3 times or other suitable multiples of the moving stroke of the sleeve 200, so that not only the moving stroke of the sleeve 200 is not too low due to the too long sleeve 200, which affects the gear shifting effect of the gear disc 300, but also the structure strength of the sleeve 200 is not too low due to the too short sleeve 200, and the sleeve 200 is not unstable in installation.
[0092] In some embodiments of the present application, as shown in Figure 4 As shown, a key structure is installed between the shaft 100 and the sleeve 200, and the relative rotation between the shaft 100 and the sleeve 200 is limited by the key structure. For example, the outer peripheral wall of the shaft 100 and the inner peripheral wall of the sleeve 200 can be provided with key grooves, the key grooves extend along the axial direction of the shaft 100, and the key structure is installed in the two key grooves and can slide along the axial direction of the shaft 100 relative to the key grooves. Alternatively, one of the outer peripheral wall of the shaft 100 and the inner peripheral wall of the sleeve 200 is provided with a key groove, the key groove extends along the axial direction of the shaft 100, and the key structure is installed on the other and extends into the key groove, and the key structure can slide along the axial direction of the shaft 100 relative to the key groove.
[0093] In this embodiment, the relative rotation between the shaft 100 and the sleeve 200 is limited by the key structure, so that the shaft 100 can drive the gear disc 300 on the sleeve 200 to rotate.
[0094] In some embodiments of the present application, as shown in Figure 5 As shown, the above gear disc device further comprises a position detection unit 1201, an electric control module 1202 and a display unit 1203.
[0095] The position detection unit 1201 is used to obtain the position of the gear disc 300 on the shaft 100.
[0096] The electric control module 1202 is electrically connected with the position detection unit 1201.
[0097] The display unit 1203 is arranged on the frame 800 and is electrically connected with the electric control module 1202.
[0098] The position detection unit 1201 can be arranged in various forms, for example, a laser radar arranged on the frame 800 can be used to detect the distance between the frame 800 and the gear disc 300, and then the position of the gear disc 300 on the shaft 100 can be determined by simple calculation, or other non-contact sensors such as ultrasonic sensors can be used for detection, and the specific detection method is various.
[0099] The position detection unit 1201 can directly detect the extension distance of the extension end of the telescopic mechanism 400, for example, the extension distance of the piston rod of the hydraulic cylinder or the screw rod of the electric push rod, so that the interference of external factors on the detection can be effectively reduced, the detection accuracy is improved, and damage of external impact to the position detection unit 1201 can be effectively reduced.
[0100] The electric control module 1202 can obtain the position information of the tooth disc 300 on the central shaft 100 through the position detection unit 1201, and then display the position information on the display unit 1203.
[0101] The display unit 1203 can be directly arranged on the handle of the bicycle. By arranging the display unit 1203 on the bicycle frame 800, the rider can know the current position of the tooth disc 300 during riding, so that the efficiency and accuracy of the rider in adjusting the tooth disc 300 are improved.
[0102] In some embodiments of the utility model, the tooth disc device further comprises a power storage unit 1204, and the power storage unit 1204 is used to provide power supply for the electric control module 1202, the display unit 1203 and the wireless communication module 1205.
[0103] In the embodiment, the power storage unit 1204 is directly used as a power supply, for example, a lithium battery or other storage battery, so that the use experience of the user can be effectively improved, and the user does not need to externally connect a mobile power supply for power supply.
[0104] In some embodiments of the utility model, the electric control module 1202, the display unit 1203 and the wireless communication module 1205 can also be powered by a mobile power supply.
[0105] In some embodiments of the utility model, the tooth disc device further comprises a wireless communication module 1205, and the wireless communication module 1205 is electrically connected with the electric control module 1202.
[0106] The wireless communication module 1205 can realize wireless communication with the outside world, for example, the current relative position of the tooth disc 300 can be transmitted to the outside world through the wireless communication module 1205, and the operation data collected by the electric control module 1202 on the remaining bicycles can also be uploaded to the cloud for storage and record, so as to provide more in-depth services for the user in the future.
[0107] The wireless communication module 1205 can adopt a Bluetooth, WIFI or other wireless communication module, and the specific selection can be selected according to actual needs.
[0108] The bicycle according to the second aspect of the utility model comprises the tooth disc device according to the first aspect of the utility model.
[0109] According to the bicycle of the embodiment of the utility model, the tooth disc device of the first aspect of the embodiment of the utility model is adopted, the riding efficiency of the bicycle user can be improved, the wear of the asymmetric tooth part and the deformation of the tooth part caused by the chain falling off and the chain returning can be reduced, the riding experience of the bicycle user can be improved, and the service life of the bicycle can be prolonged.In addition, compared with the movement of the tooth disc 300 driven by the chain when the freewheel 1100 is shifted, the tooth disc 300 is moved by the extension mechanism 400 in the application, the movement of the tooth disc 300 is smoother and more accurate, the phenomenon of jamming can be reduced, and after the tooth disc 300 is moved to the corresponding position, the tooth disc 300 will not move randomly, the stability of riding is improved.In addition, the extension mechanism 400 is installed in the middle shaft 100, damage caused by the exposure of the extension mechanism 400 can be avoided, and when the middle shaft 100 is installed, the extension mechanism 400 can be installed in the frame 800, and the installation is more convenient.
[0110] It should be noted that since the bicycle can adopt all the technical solutions of the tooth disc device of the first aspect of the embodiment, it at least has all the beneficial effects brought by the technical solutions of the first aspect of the embodiment, and these additional beneficial effects will not be described here.
[0111] It can be understood that other configurations and operations of the bicycle according to the embodiment of the utility model are known to those skilled in the art, and will not be described in detail here.
[0112] The embodiments of the utility model are described in detail above in combination with the drawings, but the utility model is not limited to the above-mentioned embodiments, and various changes can be made within the knowledge range of those skilled in the art without departing from the purpose of the utility model.
Claims
1. A dental tray apparatus, characterized by, The tooth disc device comprises: a middle shaft for being rotatably mounted on a vehicle 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 of the middle shaft; a tooth disc arranged on the shaft sleeve; a telescopic mechanism arranged in the middle shaft and connected to the shaft sleeve and / or the tooth disc to drive the shaft sleeve to move along the axial direction of the middle shaft through telescopic driving.
2. The dental disc device of claim 1, wherein, The tooth disc device further comprises: an assembly seat for being mounted on the vehicle frame, the assembly seat being provided with a mounting hole, the middle shaft being rotatably mounted in the mounting hole, and a clearance being formed between the hole wall of the mounting hole and the outer circumferential wall of the middle shaft for the shaft sleeve to extend into.
3. The dental tray apparatus of claim 2, wherein, The tooth disc device further comprises: a first bearing mounted at the end of the mounting hole away from the tooth disc; a second bearing mounted at the end of the mounting hole close to the tooth disc; the middle shaft being rotatably mounted in the first bearing and the second bearing.
4. The dental disc device of claim 3, wherein, The second bearing is arranged as a needle bearing and sleeved on the outside of the shaft sleeve, the shaft sleeve being movable relative to the second bearing along the axial direction of the middle shaft.
5. The dental disc device of claim 1, wherein, The middle shaft is provided with a mounting cavity, the telescopic mechanism being mounted in the mounting cavity, the outer circumferential wall of the middle shaft being provided with a clearance slot communicating with the mounting cavity, and the telescopic mechanism being provided with a connecting piece, the connecting piece being arranged in the clearance slot and connected to the shaft sleeve and / or the tooth disc.
6. The dental disc device of claim 1, wherein, The telescopic mechanism is arranged as a hydraulic cylinder or a pneumatic cylinder, and the tooth disc device further comprises: a first medium conveying pipe connected to the telescopic mechanism; a second medium conveying pipe rotatably connected to the first medium conveying pipe, the second medium conveying pipe being used for being connected to a driving unit.
7. The dental tray apparatus of claim 6, wherein, The tooth disc device further comprises: an assembly seat for being mounted on the vehicle frame, the assembly seat being provided with a mounting hole, the middle shaft being rotatably mounted in the mounting hole, the first medium conveying pipe being arranged in the middle shaft, the second medium conveying pipe being arranged in the assembly seat, and the outside of the middle shaft being sleeved with a rotary joint, the first medium conveying pipe being connected to the second medium conveying pipe through the rotary joint.
8. The dental disc device 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 dental disc device of claim 1, wherein, The tooth disc device further comprises: a position detection unit for acquiring the position of the tooth disc on the middle shaft; an electric control module electrically connected to the position detection unit; a display unit arranged on the vehicle frame and electrically connected to the electric control module.
10. A bicycle characterized in that, The tooth disc device comprises any one of the tooth disc devices according to claims 1 to 9.