Moving chainring mechanism and bicycle

Abstract

This application discloses a movable chainring mechanism and a bicycle, including a drive cylinder, a bottom bracket, a bushing, and chainrings. The drive cylinder includes a cylinder body and a piston. The cylinder body is mounted on the frame, the piston is slidably mounted in the cylinder body, the bottom bracket is rotatably mounted in the cylinder body, and both ends of the bottom bracket extend out of the cylinder body. The bushing is fitted onto the bottom bracket and can slide along the axial direction of the bottom bracket. The bushing and the bottom bracket are relatively fixed in the circumferential direction of the bottom bracket. The piston is detachably connected to the bushing, and the chainrings are connected to one end of the bushing. In this movable chainring mechanism and bicycle, the bottom bracket is mounted in the drive cylinder. When the bottom bracket rotates, it can drive the chainrings on the bushing to rotate. The piston is detachably connected to the bushing, and when the piston slides, it can drive the chainrings on the bushing to move, allowing the chainrings to adjust their position according to changes in the bicycle's gears. The structure is simple and the drive is convenient.

Description

Technical Field

[0001] This application relates to the field of bicycle technology, and in particular to a movable chainring mechanism and a bicycle. Background Technology

[0002] In recent years, multi-speed bicycles have developed rapidly. As a crucial component of multi-speed bicycles, the derailleur system significantly impacts their performance. In traditional derailleur systems, when a rider shifts gears, the chain moves between different levels on the freewheel. When an angle forms between the end of the chain around the freewheel and the end around the chainring, it causes a chain pull, resulting in ineffective dissipation of driving force along the bottom bracket axis. This significantly weakens the chain's transmission efficiency, affecting the rider's riding efficiency. Furthermore, chain pull can lead to uneven shifting, chain slippage, asymmetrical wear on the teeth, and tooth deformation, ultimately impacting both the rider's experience and the bicycle's lifespan. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a movable chainring mechanism, in which the bottom bracket is installed in the drive cylinder. When the bottom bracket rotates, it can drive the chainring on the bushing to rotate. The piston is detachably connected to the bushing. When the piston slides, it can drive the chainring on the bushing to move, so that the chainring can adjust its position according to the changes in the bicycle gears. The structure is simple and the drive is convenient.

[0004] This application also proposes a bicycle having the aforementioned movable chainring mechanism.

[0005] According to a first aspect embodiment of the present application, a movable chainring mechanism includes a drive cylinder, a bottom bracket, a bushing, and a chainring. The drive cylinder includes a cylinder body and a piston. The cylinder body is mounted on a vehicle frame. The piston is slidably mounted in the cylinder body. The bottom bracket is rotatably mounted in the cylinder body, with both ends of the bottom bracket extending out of the cylinder body. The bushing is sleeved on the bottom bracket and can slide along the axial direction of the bottom bracket. The bushing and the bottom bracket are relatively fixed to each other in the circumferential direction of the bottom bracket. The piston is detachably connected to the bushing. The chainring is connected to one end of the bushing.

[0006] The movable tooth plate mechanism according to the embodiments of this application has at least the following beneficial effects:

[0007] In this application, the bottom bracket is installed inside the cylinder and is fixed circumferentially to the bushing. The piston is detachably connected to the bushing. When the pedal drives the bottom bracket to rotate, the bottom bracket drives the bushing to rotate, and the bushing in turn drives the chainring to rotate. When the bicycle freewheel shifts gears, the drive cylinder can drive the piston to slide. The piston can then drive the chainring on the bushing to move axially along the bottom bracket, allowing the chainring to adapt its position to the changes in the bicycle gears. This effectively reduces the angle between the chain and the chainring, as well as the angle between the chain and the freewheel, thereby improving the rider's riding efficiency. Furthermore, because the angle is smaller, the meshing range between the chain and the chainring or freewheel teeth is wider, reducing chain slippage, asymmetrical wear on the teeth, and axial stress on the teeth, which helps reduce tooth deformation and thus extends the service life. Furthermore, in this application, the crankset movement is actively driven by the sliding piston. Compared to shifting gears via a chain, the crankset movement in this application is smoother and more precise, reducing the likelihood of jamming. Moreover, once in the correct position, it remains stationary, improving riding stability. In this application, the bottom bracket and bushing are located within the cylinder body, allowing the piston to directly drive the crankset movement. The structure is simple, the drive is convenient, and the design is ingenious. Additionally, the piston is detachable, making assembly easier and facilitating cleaning or replacement.

[0008] According to some embodiments of this application, the inner peripheral wall of the cylinder is formed with a groove, and the groove and the outer peripheral wall of the bushing form a medium cavity. The piston is located in the medium cavity to divide the medium cavity along the axial direction of the central axis to form a first cavity and a second cavity. Both the first cavity and the second cavity are provided with a connecting hole, and the connecting hole is used to connect a medium delivery pipe.

[0009] According to some embodiments of this application, the groove is annular and surrounds the bushing, and the piston is annular and surrounds the bushing.

[0010] According to some embodiments of this application, the inner peripheral wall of the cylinder body is provided with a first annular limiting portion and a second annular limiting portion arranged axially along the bushing. The first annular limiting portion and the second annular limiting portion extend circumferentially along the bushing and fit against the outer peripheral wall of the bushing. The groove is formed between the first annular limiting portion and the second annular limiting portion.

[0011] According to some embodiments of this application, one end of the bushing is integrally formed with a flange, the toothed disc is connected to the flange, the first annular limiting part is located on the side of the second annular limiting part away from the toothed disc, the inner peripheral wall of the cylinder body protrudes to form the second annular limiting part, the first annular limiting part is detachable, and the first annular limiting part and the piston can be removed from the end of the cylinder body away from the toothed disc after disassembly.

[0012] According to some embodiments of this application, the outer peripheral wall of the first annular limiting portion is threadedly connected to the inner peripheral wall of the cylinder body.

[0013] According to some embodiments of this application, the movable crank mechanism further includes a first bearing and a second bearing. The first bearing is installed at the end of the cylinder body away from the crankcase, the central shaft is installed inside the first bearing, and the second bearing is installed at the end of the cylinder body near the crankcase. The outer peripheral wall of the bushing is fitted to the inner peripheral wall of the second bearing.

[0014] According to some embodiments of this application, the outer peripheral wall of the central shaft is formed with an abutment portion, the abutment portion abutting against the side of the first bearing near the toothed plate, and an annular recess is formed on the inner side of the end of the bushing away from the toothed plate, the annular recess extending circumferentially along the bushing, and the abutment portion extending into the annular recess when the bushing slides toward the first bearing.

[0015] According to some embodiments of this application, there are multiple grooves arranged circumferentially along the bushing, and multiple pistons arranged circumferentially along the grooves.

[0016] According to some embodiments of this application, the drive cylinder is configured as a hydraulic cylinder.

[0017] According to some embodiments of this application, the second bearing is located on the side of the second annular limiting portion closer to the toothed plate, and an isolation portion is provided between the second bearing and the second annular limiting portion, the isolation portion abutting against the inner ring of the second bearing.

[0018] The bicycle according to a second aspect embodiment of this application includes the movable chainring mechanism described in the first aspect embodiment above.

[0019] The bicycle according to the embodiments of this application has at least the following beneficial effects:

[0020] The movable chainring mechanism of the first aspect embodiment of this application has a bottom bracket installed in a drive cylinder. When the bottom bracket rotates, it can drive the chainring on the bushing to rotate. The piston is detachably connected to the bushing. When the piston slides, it can drive the chainring on the bushing to move, so that the chainring can adjust its position according to the changes in the bicycle gear. The structure is simple and the drive is convenient.

[0021] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0022] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0023] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.

[0024] Figure 2 This is a schematic diagram illustrating the fit between the chainring and the freewheel in this application;

[0025] Figure 3 This is a schematic diagram of the overall structure of the movable tooth plate mechanism of this application;

[0026] Figure 4 This is a cross-sectional view of the movable tooth plate mechanism of this application;

[0027] Figure 5 for Figure 4 A magnified view of the area where the first annular limiting part is located;

[0028] Figure 6 for Figure 4 A magnified view of the area where the first bearing is located;

[0029] Figure 7 for Figure 4 A magnified view of the area where the second bearing is located.

[0030] Icon labels:

[0031] Drive cylinder 100; cylinder body 101; piston 102; medium chamber 103; first chamber 104; second chamber 105; medium conveying pipe 106; first annular limiting part 107; second annular limiting part 108; servo hydraulic station 109; reversing valve 110; first locking member 111; second locking member 112;

[0032] Central shaft 200; Abutment part 201;

[0033] 300 bushing; 301 annular recess;

[0034] Crankset 400;

[0035] First bearing 500;

[0036] Second bearing 600;

[0037] Isolation Department 700;

[0038] Frame 800;

[0039] Flywheel 900. Detailed Implementation

[0040] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0041] In the description of this application, it should be understood that the orientation descriptions, such as up, down, etc., are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0042] In the description of this application, "multiple" refers to two or more. The use of "first" and "second" is for the purpose of distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of technical features indicated, or the order in which the technical features are indicated.

[0043] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0044] To better describe the movable chainring mechanism and bicycle of this application embodiment, a brief description is given here of the 400° angle change between the chain and chainring during conventional bicycle gear shifting. (Reference) Figure 1 When the chain is in the highest gear (900) on the cassette, there is a large angle θ between the chain and the chainring 400. Because of this angle θ, a significant axial component of the chain's driving force cannot be used to drive the cassette 900, resulting in energy waste. Understandably, the larger the angle θ, the more energy is wasted. This embodiment reduces energy waste by decreasing the angle θ, thereby improving riding efficiency. (Reference) Figure 2 , Figure 2 The dashed rectangle can be understood as the position of the crankset 400 before it moves, and the solid rectangle can be understood as the position of the crankset 400 after it moves. The included angle after the movement is β, which is significantly smaller than the angle θ, thus effectively reducing the axial force component.

[0045] The following is for reference. Figures 3 to 7 This application describes a movable chainring mechanism and a bicycle according to embodiments thereof.

[0046] like Figure 3 and Figure 4As shown, the movable crank mechanism according to the first aspect embodiment of this application includes a drive cylinder 100, a central shaft 200, a bushing 300, and a crank 400.

[0047] The drive cylinder 100 includes a cylinder body 101 and a piston 102. The cylinder body 101 is used to mount the frame 800. The piston 102 is slidably mounted in the cylinder body 101. The central shaft 200 is rotatably mounted in the cylinder body 101. Both ends of the central shaft 200 extend out of the cylinder body 101. The bushing 300 is sleeved on the central shaft 200 and can slide along the axial direction of the central shaft 200. The bushing 300 and the central shaft 200 are relatively fixed in the circumferential direction of the central shaft 200. The piston 102 is detachably connected to the bushing 300. The chainring 400 is connected to one end of the bushing 300.

[0048] For example, the drive cylinder 100 can be a hydraulic cylinder or a pneumatic cylinder, and the frame 800 can be provided with mounting holes, in which the drive cylinder 100 is installed. The cylinder body 101 can have a mounting cavity, with both ends of the cavity extending through it, and the piston 102 is slidably installed within the cylinder body 101. The sliding direction of the piston 102 can be horizontal, and the piston 102 is driven by a medium such as oil or gas.

[0049] The bottom bracket 200 is rotatably mounted in the mounting cavity of the cylinder 101. The axial direction of the bottom bracket 200 can be parallel to the sliding direction of the piston 102. Both ends of the bottom bracket 200 extend out of the cylinder 101. Crank connecting shafts can be set at both ends of the bottom bracket 200 for connecting cranks. The cranks are used to mount the pedals. The rider rotates the cranks by rotating the pedals, thereby driving the bottom bracket 200 to rotate.

[0050] The bushing 300 is fitted onto the central shaft 200 and can slide along the axial direction of the central shaft 200. The bushing 300 and the central shaft 200 are relatively fixed in the circumferential direction of the central shaft 200. Specifically, the central shaft 200 and the bushing 300 can be connected by a key. In this case, along the axial direction of the central shaft 200, the keyway for installing the key is longer than the key to facilitate the sliding of the bushing 300. Alternatively, the bushing hole of the bushing 300 can be set as a square hole, thus allowing the central shaft 200 and the bushing 300 to be relatively fixed in the circumferential direction of the central shaft 200. The piston 102 and the bushing 300 are detachably connected. For example, part of the bushing 300 is located inside the cylinder body 101, and one end of the bushing 300 can extend out of the cylinder body 101. The piston 102 and the part of the bushing 300 located inside the cylinder body 101 are detachably connected. The piston 102 and the bushing 300 can be connected by snap-fit, interference fit, or fasteners, etc.

[0051] The chainring 400 is connected to one end of the bushing 300. Specifically, the chainring 400 is connected to the end of the bushing 300 that extends out of the cylinder body 101. When the foot pedal drives the bottom bracket 200 to rotate, the bottom bracket 200 drives the bushing 300 to rotate, and the bushing 300 in turn drives the chainring 400 to rotate. The drive cylinder 100 can drive the piston 102 to slide, and the piston 102 can drive the bushing 300 to slide along the axial direction of the bottom bracket 200. The bushing 300 can then drive the chainring 400 to move along the axial direction of the bottom bracket 200, thereby adjusting the relative position of the chainring 400 and the bottom bracket 200.

[0052] In this application, the bottom bracket 200 is installed inside the cylinder 101 and is fixed circumferentially to the bushing 300. The piston 102 is detachably connected to the bushing 300. When the pedal drives the bottom bracket 200 to rotate, the bottom bracket 200 drives the bushing 300 to rotate, which in turn drives the chainring 400 to rotate. When the bicycle freewheel 900 shifts gears, the drive cylinder 100 can drive the piston 102 to slide. The piston 102 can then drive the chainring 400 on the bushing 300 to move axially along the bottom bracket 200, allowing the chainring 400 to adapt its position to the changes in bicycle gears. This effectively reduces the angle between the chain and the chainring 400, as well as the angle between the chain and the freewheel 900, thereby improving the rider's riding efficiency.

[0053] Furthermore, the smaller angle allows for a wider engagement range between the chain and the teeth of the chainring 400 or cassette 900, reducing chain slippage, asymmetrical tooth wear, and axial stress on the teeth, thus minimizing tooth deformation and extending service life. Additionally, in this application, the chainring 400 is actively driven to move via the sliding of the drive piston 102. Compared to the chain-driven movement of the chainring 400 during gear shifting with the cassette 900, the chainring 400 moves more smoothly and precisely, reducing the likelihood of jamming. Moreover, once in the correct position, it remains stationary, improving riding stability.

[0054] In this application, the bottom bracket 200 and bushing 300 are located inside the cylinder block 101. When the piston 102 slides, it can directly drive the chainring 400 to move. The structure is simple, the drive is convenient, and the design is ingenious. Moreover, the piston 102 is detachable, making it easier to assemble the chainring moving mechanism and also facilitating the cleaning or replacement of the piston 102. Furthermore, the bottom bracket 200 is assembled inside the drive cylinder 100, forming an integral assembly structure, which makes it easier to assemble on or disassemble from the frame 800.

[0055] It should be noted that the chainring 400 can stop at multiple gears when it moves along the axial direction of the central axis 200, for example, three. The gears of the chainring 400 on both sides can correspond to multiple gears on both sides of the freewheel 900, and the gears of the chainring 400 in the middle can correspond to multiple gears in the middle of the freewheel 900.

[0056] In some embodiments of this application, such as Figure 4 , Figure 5 and Figure 7 As shown, the inner peripheral wall of the cylinder 101 has a groove, which surrounds the outer peripheral wall of the bushing 300 to form a medium cavity 103. The piston 102 is located in the medium cavity 103 to divide the medium cavity 103 along the axial direction of the central axis 200 to form a first cavity 104 and a second cavity 105. Both the first cavity 104 and the second cavity 105 are provided with connecting holes for connecting the medium delivery pipe 106.

[0057] Taking hydraulic oil as the medium as an example, the medium delivery pipe 106 is an oil pipe, and two connecting holes can be connected to a servo hydraulic station 109 through the medium delivery pipe 106. The medium delivery pipe 106 can be equipped with a reversing valve 110. When the servo hydraulic station 109 injects oil into the first chamber 104 through the medium delivery pipe 106 and extracts oil from the second chamber 105, it can drive the piston 102 to slide in one direction, thereby driving the bushing 300 to slide in one direction. After the reversing valve 110 reverses, the servo hydraulic station 109 injects oil into the second chamber 105 through the medium delivery pipe 106 and extracts oil from the first chamber 104, thereby driving the piston 102 to slide in the opposite direction, thereby driving the bushing 300 to slide in the opposite direction, thus realizing the sliding adjustment of the bushing 300, thereby realizing the axial movement adjustment of the crank 400 along the central shaft 200. The structure is simple, the operation is convenient, and the adjustment effect is good. Moreover, the outer peripheral wall of the bushing 300 and the inner peripheral wall of the cylinder body 101 form a medium cavity 103. Compared with traditional oil cylinders or air cylinders, the central shaft 200 passing through the cylinder body 101 does not need to pass through the medium cavity 103, thus it will not affect the medium in the medium cavity 103, nor will it affect the sealing of the medium cavity 103.

[0058] In some embodiments of this application, such as Figure 4 As shown, the groove is annular and surrounds the bushing 300, and the piston 102 is annular and surrounds the bushing 300. This arrangement not only facilitates the machining of the groove and the piston 102, but also improves the sliding effect of driving the piston 102. In addition, the bushing 300 can cooperate with the piston 102 when rotated to different angles, further improving the sliding effect of driving the bushing 300. Furthermore, the groove sealing is more convenient and has a better sealing effect.

[0059] It should be noted that in some other embodiments of this application, multiple grooves may be provided, arranged circumferentially along the bushing 300, and multiple pistons 102 may be provided accordingly, arranged circumferentially along the grooves. For example, the outer peripheral wall of the bushing 300 may have an annular recess along the circumferential direction, the piston 102 may be engaged in the annular recess and be able to slide relative to the bushing 300 along the circumferential direction. Sealing parts may be provided on both sides of the piston 102, sealing the groove between the groove and the outer annular recess to achieve a sealing effect. By synchronously driving the multiple pistons 102 to slide, the multiple pistons 102 can jointly drive the bushing 300 to slide.

[0060] In this embodiment, multiple pistons 102 are provided. When one of the pistons 102 is damaged, the corresponding piston 102 can be replaced instead of replacing all the pistons 102, which reduces costs.

[0061] In some embodiments of this application, such as Figure 4 , Figure 5 and Figure 7 As shown, the inner peripheral wall of the cylinder body 101 is provided with a first annular limiting part 107 and a second annular limiting part 108 arranged along the axial direction of the bushing 300. The first annular limiting part 107 and the second annular limiting part 108 extend along the circumferential direction of the bushing 300 and fit against the outer peripheral wall of the bushing 300. A groove is formed between the first annular limiting part 107 and the second annular limiting part 108.

[0062] In this embodiment, a first annular limiting part 107 and a second annular limiting part 108 are provided on the inner peripheral wall of the cylinder 101 to form a medium cavity 103. The structure is simple, and the first annular limiting part 107 and the second annular limiting part 108 can also naturally seal the medium cavity 103, resulting in better sealing performance.

[0063] In some embodiments of this application, such as Figure 4 , Figure 5 and Figure 7 As shown, one end of the bushing 300 is integrally formed with a flange, the sprocket 400 is connected to the flange, the first annular limiting part 107 is located on the side of the second annular limiting part 108 away from the sprocket 400, the inner peripheral wall of the cylinder body 101 protrudes to form the second annular limiting part 108, the first annular limiting part 107 is detachable, and after the first annular limiting part 107 and the piston 102 are disassembled, they can be taken out from the end of the cylinder body 101 away from the sprocket 400.

[0064] In this embodiment, the inner peripheral wall of the cylinder body 101 protrudes to form a second annular limiting part 108, meaning the cylinder body 101 and the second annular limiting part 108 are integrally formed, simplifying processing and improving sealing. The flange and bushing 300 are integrally formed, resulting in high structural strength. In this embodiment, based on the integral forming of the flange and bushing 300, during assembly, the bushing 300 can be inserted into the cylinder body 101 from the end near the gear 400. Then, the piston 102 is inserted into the cylinder body 101 from the end away from the gear 400 and connected to the bushing 300. Next, the first annular limiting part 107 is inserted into the cylinder body 101 from the end away from the gear 400 and connected to the cylinder body 101. When the piston 102 needs to be disassembled for maintenance, replacement, or cleaning, the first annular limiting part 107 is removed, and then the piston 102 is removed and pulled out from the end of the cylinder body 101 away from the gear 400. This avoids the situation where the piston 102 is difficult to install and remove from the end of the cylinder 101 near the sprocket 400 due to the non-removable flange, making assembly and disassembly more convenient.

[0065] In some embodiments of this application, the outer peripheral wall of the first annular limiting portion 107 is threadedly connected to the inner peripheral wall of the cylinder body 101. For example, the outer peripheral wall of the first annular limiting portion 107 is provided with an external thread, and the inner peripheral wall of the corresponding area of ​​the cylinder body 101 is provided with an internal thread. The outer peripheral wall of the first annular limiting portion 107 and the inner peripheral wall of the cylinder body 101 are connected by the mating of the external and internal threads, which makes it more convenient to disassemble and assemble the first annular limiting portion 107.

[0066] Of course, the first annular limiting part 107 can also be engaged with the cylinder body 101.

[0067] In some embodiments of this application, such as Figure 4 , Figure 6 and Figure 7 As shown, the moving chainring mechanism also includes a first bearing 500 and a second bearing 600. The first bearing 500 is installed in the cylinder 101 at the end away from the chainring 400. The central shaft 200 is installed in the first bearing 500. The second bearing 600 is installed in the cylinder 101 at the end near the chainring 400. The outer peripheral wall of the bushing 300 is attached to the inner peripheral wall of the second bearing 600.

[0068] In this embodiment, the rotational installation of the central shaft 200 can be achieved using the first bearing 500 and the second bearing 600, satisfying the rotational requirements of the central shaft 200 and making its rotation smoother. Furthermore, the second bearing 600 can also support the bushing 300, making its sliding and rotation smoother.

[0069] It should be noted that the second bearing 600 can be a bearing without an inner ring, and the bushing 300 acts as the inner ring of the second bearing 600. Thus, the bushing 300 can rotate and slide relative to the outer ring of the second bearing 600. A first locking member 111 can be provided on the side of the first bearing 500 and the second bearing 600 opposite to each other to lock and position the first bearing 500 and the second bearing 600. For example, there can be two first locking members 111 for locking the first bearing 500. One first locking member 111 can be threaded or snapped into the central shaft 200 to abut against the inner ring of the first bearing 500, and the other first locking member 111 can be threaded or snapped into the cylinder body 101 to abut against the outer ring of the first bearing 500. There can be only one first locking member 111 for locking the second bearing 500, which is threaded or snapped into the cylinder body 101.

[0070] In some embodiments of this application, such as Figure 4 and Figure 7 As shown, the second bearing 600 is located on the side of the second annular limiting portion 108 near the gear plate 400, and an isolation portion 700 is provided between it and the second annular limiting portion 108. The isolation portion 700 abuts against the inner ring of the second bearing 600. For example, the isolation portion 700 may be annular and sleeved on the outside of the bushing 300.

[0071] In this embodiment, the second bearing 600 is located on the side of the second annular limiting part 108 near the gear 400, making disassembly and assembly more convenient and providing better support for the bushing 300. The isolation part 700 not only limits the movement of the second bearing 600 but also separates it from the second annular limiting part 108, preventing the second annular limiting part 108 from interfering with the operation of the second bearing 600.

[0072] In some embodiments of this application, such as Figure 4 and Figure 6 As shown, the outer peripheral wall of the central shaft 200 has an abutment portion 201, which abuts against the side of the first bearing 500 near the toothed plate 400. An annular recess 301 is formed on the inner side of the end of the bushing 300 away from the toothed plate 400. The annular recess 301 extends circumferentially along the bushing 300. When the bushing 300 slides toward the first bearing 500, the abutment portion 201 can extend into the annular recess 301.

[0073] In this embodiment, an abutment portion 201 is provided to limit the first bearing 500. The abutment portion 201 is integrally formed through the outer peripheral wall of the central shaft 200, which facilitates processing. An annular recess 301 is formed on the inner side of the end of the bushing 300 away from the crankcase 400. When the bushing 300 slides toward the first bearing 500, the abutment portion 201 can extend into the annular recess 301. This makes the movement path of the bushing 300 longer, and thus the movement path of the crankcase 400 longer.

[0074] In some embodiments of this application, the drive cylinder 100 is configured as a hydraulic cylinder. Hydraulic cylinders have strong driving force, and the drive bushing 300 slides more precisely, resulting in better adjustment of the crankset 400.

[0075] It should be noted that the drive cylinder 100 can also be a pneumatic cylinder, which will not be elaborated here.

[0076] In some embodiments of this application, reference is made to Figure 4 , Figure 6 and Figure 7 As shown, the frame 800 may be provided with second locking members 112 at both ends of the cylinder 101. The second locking members 112 and the frame 800 may be threaded or snapped together. The second locking members 112 limit the cylinder 101 to prevent the cylinder 101 from moving at will.

[0077] The bicycle according to a second aspect embodiment of this application includes the movable chainring mechanism described in the first aspect embodiment.

[0078] According to the embodiments of this application, the bicycle employs a movable chainring mechanism as described in the first aspect of this application. The bottom bracket 200 is installed inside the drive cylinder 100. When the bottom bracket 200 rotates, it can drive the chainring 400 on the bushing 300 to rotate. The piston 102 is detachably connected to the bushing 300. When the piston 102 slides, it can drive the chainring 400 on the bushing 300 to move, so that the chainring 400 adjusts its position according to the changes in the bicycle gears. The structure is simple and the drive is convenient.

[0079] It should be noted that since the bicycle can adopt all the technical solutions of the movable chainring mechanism 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.

[0080] It is understood that other components and operations of the bicycle according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0081] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A mobile pallet mechanism, characterized in that, include: A drive cylinder includes a cylinder body and a piston, the cylinder body being mounted on a vehicle frame, and the piston being slidably mounted within the cylinder body; A central shaft is rotatably mounted inside the cylinder, with both ends of the central shaft extending out of the cylinder. A bushing is fitted onto the central shaft and can slide along the axial direction of the central shaft. The bushing and the central shaft are fixed relative to each other in the circumferential direction of the central shaft. The piston is detachably connected to the bushing. The toothed disc is connected to one end of the bushing.

2. The mobile platen mechanism of claim 1, wherein, The inner peripheral wall of the cylinder is formed with a groove, and the groove and the outer peripheral wall of the bushing form a medium cavity. The piston is located in the medium cavity to divide the medium cavity along the axial direction of the central axis to form a first cavity and a second cavity. Both the first cavity and the second cavity are provided with a connecting hole, which is used to connect a medium delivery pipe.

3. The mobile platen mechanism of claim 2, wherein, The groove is annular and surrounds the bushing, and the piston is annular and surrounds the bushing.

4. The mobile platen mechanism of claim 3, wherein, The inner peripheral wall of the cylinder body is provided with a first annular limiting part and a second annular limiting part arranged along the axial direction of the bushing. The first annular limiting part and the second annular limiting part extend along the circumferential direction of the bushing and fit against the outer peripheral wall of the bushing. The groove is formed between the first annular limiting part and the second annular limiting part.

5. The mobile platen mechanism of claim 4, wherein, One end of the bushing is integrally formed with a flange, the toothed disc is connected to the flange, the first annular limiting part is located on the side of the second annular limiting part away from the toothed disc, the inner peripheral wall of the cylinder body protrudes to form the second annular limiting part, the first annular limiting part is detachable, and the first annular limiting part and the piston can be removed from the end of the cylinder body away from the toothed disc after disassembly.

6. The mobile platen mechanism of claim 1, wherein, Also includes: The first bearing is installed in the cylinder body at the end away from the gear ring, and the central shaft is installed in the first bearing; The second bearing is installed in the cylinder body at one end near the gear ring, and the outer peripheral wall of the bushing is in contact with the inner peripheral wall of the second bearing.

7. The mobile platen mechanism of claim 6, wherein, The outer peripheral wall of the central shaft has an abutment portion that abuts against the side of the first bearing near the toothed plate. An annular recess is formed on the inner side of the end of the bushing away from the toothed plate. The annular recess extends circumferentially along the bushing. When the bushing slides toward the first bearing, the abutment portion can extend into the annular recess.

8. The mobile platen mechanism of claim 2, wherein, The bushing has multiple grooves arranged circumferentially, and the piston has multiple pistons arranged circumferentially along the grooves.

9. The mobile platen mechanism of claim 1, wherein, The drive cylinder is a hydraulic cylinder.

10. A bicycle characterized in that, Includes the movable tooth plate mechanism as described in any one of claims 1 to 9.

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