Electro-hydraulic chainring assembly, shifting system and bicycle

Abstract

This application discloses an electro-hydraulic crankset assembly, a shifting system, and a bicycle. The bottom bracket is installed in a cylinder and is fixed circumferentially to a bushing. A piston is connected to the bushing. When the pedals rotate the bottom bracket, the bottom bracket rotates the bushing, which in turn rotates the crankset. When the freewheel shifts gears, a servo hydraulic station can actively drive the piston to move axially, causing the bushing and crankset to adjust their positions synchronously. This reduces the angle between the chain, crankset, and freewheel, improving riding efficiency. Furthermore, the reduced angle expands the meshing range between the chain and teeth, reducing chain slippage, asymmetrical wear, and axial stress, lowering the risk of tooth deformation, and extending component lifespan. Compared to the traditional passive adjustment method of the chain driving the crankset, this embodiment uses active control via a servo hydraulic station, resulting in smoother and more precise crankset movement, avoiding jamming, and ensuring stable positioning after reaching its destination, thus improving riding stability.

Description

Technical Field

[0001] This application relates to the field of bicycles, and in particular to an electro-hydraulic chainring assembly, a shifting system, and a bicycle. Background Technology

[0002] In traditional multi-speed bicycles, the chain moves between different sprockets on the freewheel during gear shifting. If the end of the chain that wraps around the freewheel forms an angle with the end that wraps around the chainring, it causes chain slippage. In this situation, the driving force transmitted by the chain experiences ineffective losses along the bottom bracket axis, significantly reducing transmission efficiency and directly affecting the rider's power output. Furthermore, chain slippage can cause shifting jerks, leading to chain drop, asymmetrical wear on the sprockets, and tooth deformation, which not only compromises riding comfort but also shortens the overall lifespan of the bicycle. Utility Model Content

[0003] This application aims to provide an electro-hydraulic chainring assembly, a gear shifting system, and a bicycle that can improve the rider's riding experience and extend the bicycle's service life.

[0004] According to a first aspect embodiment of this application, the electro-hydraulic crank assembly includes:

[0005] A hydraulic cylinder, comprising a cylinder body and a piston, the cylinder body being mounted on a vehicle frame;

[0006] A central shaft is rotatably mounted inside the cylinder, with both ends of the central shaft extending out of the cylinder.

[0007] 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. A hydraulic cavity is formed between the inner circumferential wall of the cylinder and the outer circumferential wall of the bushing. The piston is slidably installed in the hydraulic cavity along the axial direction of the central shaft. The piston is connected to the bushing.

[0008] The toothed disc is connected to one end of the bushing;

[0009] The first bearing is installed inside the hydraulic cavity and sleeved on the bushing;

[0010] A servo hydraulic station is used to adjust the injection state of the hydraulic oil entering the cylinder so that the piston moves axially along the central shaft and drives the bushing to move synchronously.

[0011] The control module is electrically connected to the servo hydraulic station and is used to control the operation of the servo hydraulic station.

[0012] A bicycle gear shifting system according to a second aspect embodiment of this application includes:

[0013] The electro-hydraulic crank assembly as described in the first aspect embodiment;

[0014] The flywheel speed changer is connected to the control module and is used to adjust the flywheel's gear position.

[0015] The bicycle according to a third aspect embodiment of this application includes the bicycle gear shifting system as described in the first aspect embodiment.

[0016] The electro-hydraulic chainring assembly, gearshifting system, and bicycle of this application embodiment feature a bottom bracket mounted within a cylinder and fixed circumferentially to a bushing. A piston is connected to the bushing. When the pedals rotate the bottom bracket, the bottom bracket rotates the bushing, which in turn rotates the chainring. When the freewheel shifts gears, a servo hydraulic station actively drives the piston to move axially, simultaneously adjusting the bushing and chainring positions. This reduces the angle between the chain, chainring, and freewheel, improving riding efficiency. Furthermore, the reduced angle expands the chain-tooth engagement range, reducing chain slippage, asymmetrical wear, and axial stress, lowering the risk of tooth deformation, and extending component lifespan. Compared to the traditional passive adjustment method of the chain-driven chainring, this application embodiment utilizes a servo hydraulic station for active control, resulting in smoother and more precise chainring movement, preventing jamming, and ensuring stable positioning after reaching its destination, thus improving riding stability.

[0017] Other features and advantages of this application will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing this application. Attached Figure Description

[0018] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0019] Figure 1 This is a schematic diagram illustrating the connection between a traditional chainring and a freewheel.

[0020] Figure 2 This is a schematic diagram illustrating the fit between the chainring and the freewheel in this application;

[0021] Figure 3 An electrical system diagram of an electro-hydraulic crankset assembly provided in an embodiment of this application;

[0022] Figure 4 This is a schematic diagram of the overall structure of the electro-hydraulic crank assembly provided in the embodiments of this application;

[0023] Figure 5 A cross-sectional view of the electro-hydraulic crank assembly provided in an embodiment of this application;

[0024] Figure 6 for Figure 5 A magnified view of the area where the first annular limiting part is located;

[0025] Figure 7 for Figure 5 A magnified view of the area where the second bearing is located.

[0026] Figure label:

[0027] Hydraulic cylinder 100; cylinder body 101; piston 102; hydraulic chamber 103; first chamber 104; second chamber 105; oil pipe 106; first annular limiting part 107; second annular limiting part 108; step 109; first locking member 110; second locking member 111; servo hydraulic station 112; third locking member 113;

[0028] Central shaft 200; key structure 201; abutment part 202;

[0029] 300 bushing; 301 keyway; 302 annular countersunk;

[0030] Crankset 400;

[0031] First bearing 500;

[0032] Second bearing 600;

[0033] Frame 700;

[0034] Position detection unit 800; magnetic ring 801; displacement sensor 802;

[0035] Flywheel 900;

[0036] Control module 1010; display unit 1020; torque detection unit 1030; cadence detection unit 1040; human-computer interaction unit 1050; lactic acid detection device 1060; heart rate detection device 1070; blood pressure detection device 1080. Detailed Implementation

[0037] 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.

[0038] In the description of this application, the use of terms such as "first," "second," etc., 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 of the technical features indicated.

[0039] 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.

[0040] In the description of this application, it should be noted that, unless otherwise explicitly 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.

[0041] The technical solution of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described below are some embodiments of this application, not all embodiments.

[0042] To better describe the electro-hydraulic chainring assembly, bicycle, and bicycle shifting system of the embodiments of this application, a brief description is given here of the 400° angle change between the chain and the 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.

[0043] Based on the above scenario, the following describes the electro-hydraulic crankset assembly, control method, device, equipment, hydraulic oil, and bicycle according to embodiments of this application.

[0044] See Figures 3 to 7 As shown, one embodiment of this application provides an electro-hydraulic crankset assembly, which includes:

[0045] Hydraulic cylinder 100 includes cylinder body 101 and piston 102, cylinder body 101 is used for mounting on frame 700;

[0046] The central shaft 200 is rotatably mounted inside the cylinder body 101, with both ends of the central shaft 200 extending out of the cylinder body 101;

[0047] A bushing 300 is fitted onto a 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. A hydraulic cavity 103 is formed between the inner circumferential wall of the cylinder 101 and the outer circumferential wall of the bushing 300. A piston 102 is slidably installed in the hydraulic cavity 103 along the axial direction of the central shaft 200. The piston 102 is connected to the bushing 300.

[0048] The toothed sprocket 400 is connected to one end of the bushing 300;

[0049] The first bearing 500 is installed in the hydraulic cavity 103 and sleeved on the bushing 300;

[0050] The servo hydraulic station 112 is used to adjust the injection state of the hydraulic oil entering the cylinder 101 so that the piston 102 moves axially along the central shaft 200 and drives the bushing 300 to move synchronously.

[0051] The control module 1010 is electrically connected to the servo hydraulic station 112 and is used to control the operation of the servo hydraulic station 112.

[0052] In this embodiment, the bottom bracket 200 is installed inside the cylinder 101 and is circumferentially fixed to the bushing 300. The piston 102 is 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 freewheel 900 shifts gears, the servo hydraulic station 112 can actively drive the piston 102 to move axially and drive the bushing 300 and chainring 400 to adjust their positions synchronously, thereby reducing the angle between the chain and the chainring 400 and the freewheel 900, improving riding efficiency. Furthermore, the reduced angle expands the meshing range between the chain and the teeth, reducing chain slippage, asymmetrical wear, and axial force, lowering the risk of tooth deformation, and extending the service life of components. Compared to the traditional passive adjustment method of the chain driving the chainring 400, this embodiment actively controls the chainring 400 through the servo hydraulic station 112, resulting in smoother and more precise movement, avoiding jamming, and ensuring stable positioning after reaching its destination, thus improving riding stability.

[0053] Furthermore, the central shaft 200 and bushing 300 are located within the cylinder body 101, allowing the piston 102 to directly drive the chainring 400 when sliding. This design is simple and convenient. Moreover, the central shaft 200 and bushing 300 are assembled within the cylinder body 101 of the hydraulic cylinder 100, forming a single assembly that is easier to install on or remove from the frame 700. Additionally, the first bearing 500 supporting the bushing 300 is located within the hydraulic chamber 103. The hydraulic oil in the chamber 103, besides driving the piston 102, can also directly lubricate the first bearing 500, making lubrication more convenient and effective. This design eliminates the need for additional oil passages, resulting in a simpler structure, easier machining, and a clever design. Moreover, the outer peripheral wall of the bushing 300 and the inner peripheral wall of the cylinder body 101 form a hydraulic cavity 103. Compared with the traditional oil cylinder, the central shaft 200 passing through the cylinder body 101 does not need to pass through the hydraulic cavity 103, thus it will not affect the oil in the hydraulic cavity 103, nor will it affect the sealing of the hydraulic cavity 103.

[0054] The aforementioned control module 1010 can use electronic control devices, such as electronic switches, electronic control panels, etc., to enable direct manual control of operation. In this case, the position that the drive chainring 400 can move to can be adjusted by the user based on their riding experience.

[0055] The aforementioned control module 1010 can also directly achieve automatic adjustment of the crankset position so that the crankset 400 is always in a better relative position with the freewheel 900.

[0056] The frame 700 may be provided with mounting holes, and the hydraulic cylinder 100 is installed in the mounting holes. The cylinder body 101 may be provided with mounting cavities, and both ends of the mounting cavity may be through-holes. The bottom bracket 200 is rotatably installed in the mounting cavity of the cylinder body 101. The bottom bracket 200 may extend horizontally, and both ends of the bottom bracket 200 extend out of the cylinder body 101. The two ends of the bottom bracket 200 are used to connect cranks, and the cranks are used to install pedals. The rider rotates the cranks by pedaling, thereby driving the bottom bracket 200 to rotate.

[0057] The aforementioned 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. Part of the bushing 300 is located within the mounting cavity of the cylinder body 101, and one end of the bushing 300 can extend out of the mounting cavity of the cylinder body 101. A hydraulic cavity 103 is formed between the inner circumferential wall of the mounting cavity of the cylinder body 101 and the outer circumferential wall of the bushing 300. The hydraulic cavity 103 can be annular and surrounds the bushing 300. The piston 102 can be annular and surrounds the bushing 300. The piston 102 is slidably mounted within the hydraulic cavity 103 along the axial direction of the central shaft 200. The hydraulic oil in the hydraulic cavity 103 pushes the piston 102 to slide. The piston 102 is connected to the portion of the bushing 300 located within the cylinder body 101.

[0058] The aforementioned 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 hydraulic 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.

[0059] The aforementioned first bearing 500 is installed within the hydraulic chamber 103 and sleeved on the bushing 300. There can be one or two first bearings 500. The first bearing 500 supports the bushing 300, making its rotation and sliding smoother. Since the first bearing 500 is located within the hydraulic chamber 103, the hydraulic oil within the chamber, in addition to pushing the piston 102 to slide, can also directly lubricate the first bearing 500. The first bearing 500 can be a bearing without an inner ring, with the bushing 300 acting as the inner ring, thus facilitating the rotation and sliding of the bushing 300.

[0060] In some implementations, such as Figure 5 and Figure 6 As shown, an annular groove is formed on the inner peripheral wall of the cylinder body 101. The annular groove surrounds the bushing 300 and forms a hydraulic chamber 103 between it and the outer peripheral wall of the bushing 300. The piston 102 is annular and extends along the circumference of the bushing 300 to divide the hydraulic chamber 103 along the axial direction of the central shaft 200 to form a first chamber 104 and a second chamber 105. Both the first chamber 104 and the second chamber 105 are provided with connecting holes for connecting the oil pipe 106.

[0061] The two connecting holes mentioned above can be connected to a servo hydraulic station 112 via an oil pipe 106. The servo hydraulic station 112 injects oil into the first chamber 104 through the oil pipe 106 and extracts oil from the second chamber 105, thereby driving the piston 102 to slide in one direction, and thus driving the bushing 300 to slide in one direction. The servo hydraulic station 112 injects oil into the second chamber 105 through the oil pipe 106 and extracts oil from the first chamber 104, thereby driving the piston 102 to slide in the opposite direction, and thus driving the bushing 300 to slide in the opposite direction, thereby realizing the sliding adjustment of the bushing 300, and thus realizing the axial movement adjustment of the crank 400 along the central axis 200. The structure is simple, the operation is convenient, and the adjustment effect is good.

[0062] In some embodiments, the servo hydraulic station 112 includes:

[0063] A servo hydraulic pump is connected to a communication hole provided on the first chamber 104 and the second chamber 105 via an oil pipe 106;

[0064] The control valve assembly is used to adjust the state of the servo hydraulic pump injecting hydraulic oil into the first chamber 104 and the second chamber 105; both the control valve assembly and the servo hydraulic pump are electrically connected to the control module 1010.

[0065] The aforementioned control valve assembly can be a directional valve or a servo valve with directional control capability.

[0066] In this embodiment, a servo hydraulic pump can be used to provide a hydraulic power source, and a control valve group can be used to control the injection of hydraulic oil into the first chamber 104 and the second chamber 105, thereby realizing the adjustment of the driving direction of the piston 102.

[0067] In some implementations, such as Figure 5 and Figure 6 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. An annular groove is formed between the first annular limiting part 107 and the second annular limiting part 108.

[0068] In this embodiment, a hydraulic chamber 103 is formed by providing a first annular limiting part 107 and a second annular limiting part 108 on the inner peripheral wall of the cylinder body 101. The structure is simple, and the first annular limiting part 107 and the second annular limiting part 108 can also naturally seal the hydraulic chamber 103, resulting in better sealing performance.

[0069] In some implementations, such as Figure 5 and Figure 6 As shown, one end of the bushing 300 is connected to a detachable flange, the crankcase 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 crankcase 400, the inner peripheral wall of the cylinder body 101 protrudes to form the first annular limiting part 107, the second annular limiting part 108 is detachable, and after disassembly, it can be removed from the end of the cylinder body 101 near the crankcase 400.

[0070] In this embodiment, the inner peripheral wall of the cylinder body 101 protrudes to form a first annular limiting part 107, meaning the cylinder body 101 and the first annular limiting part 107 are integrally formed, simplifying processing and improving sealing. In this embodiment, because the crankset 400 is relatively large, for ease of assembly and disassembly, the bushing 300 is optimally inserted and withdrawn from the end of the cylinder body 101 closest to the crankset 400. Thus, the second annular limiting part 108 is detachably connected to the cylinder body 101, facilitating the insertion and withdrawal of the bushing 300 from the cylinder body 101. To further facilitate the assembly and disassembly of the second annular limiting part 108, a flange is detachably connected to the bushing 300, preventing interference from the crankset 400 during assembly and disassembly of the second annular limiting part 108, making assembly and disassembly more convenient.

[0071] In some embodiments, the outer peripheral wall of the second annular limiting portion 108 is threadedly connected to the inner peripheral wall of the cylinder body 101. For example, the outer peripheral wall of the second annular limiting portion 108 is provided with external threads, and the inner peripheral wall of the corresponding area of ​​the cylinder body 101 is provided with internal threads. The outer peripheral wall of the second annular limiting portion 108 and the inner peripheral wall of the cylinder body 101 are connected by the mating of external and internal threads, which makes it more convenient to disassemble and assemble the second annular limiting portion 108.

[0072] The aforementioned second annular limiting part 108 can also be engaged with the cylinder body 101.

[0073] In some implementations, such as Figure 5 and Figure 6 As shown, piston 102 is detachably connected to bushing 300.

[0074] The portion of the piston 102 and the bushing 300 located within the cylinder body 101 can be connected by snap-fit, interference fit, threaded connection, or fasteners. This facilitates cleaning of the piston 102, and when the piston 102 wears out, it can be replaced separately without replacing other parts, thus reducing costs.

[0075] In some embodiments, the portion of the piston 102 and the bushing 300 located inside the cylinder 101 may also be integrally formed.

[0076] In some implementations, such as Figure 5 As shown, there are two first bearings 500, which are located at the two ends of the hydraulic chamber 103 in the axial direction.

[0077] In this embodiment, two first bearings 500 are provided, which makes the support for the bushing 300 more stable and makes the rotation and sliding of the bushing 300 smoother. The two first bearings 500 are located at the two ends of the axial direction of the hydraulic chamber 103, which can avoid interference with the sliding of the piston 102.

[0078] In some implementations, such as Figure 5As shown, the inner peripheral wall of the bushing 300 is provided with a keyway 301, which extends along the axial direction of the bushing 300 and passes through the end of the bushing 300 away from the gear plate 400. The outer peripheral wall of the central shaft 200 is provided with a key structure 201, which is slidably installed in the keyway 301 along the axial direction of the bushing 300. The length of the keyway 301 is greater than the length of the key structure 201.

[0079] In this embodiment, the key structure 201 and the keyway 301 cooperate to fix the bushing 300 and the central shaft 200 relatively in the circumferential direction, and also allow the bushing 300 to slide along the axial direction of the central shaft 200. The keyway 301 passes through the end of the bushing 300 away from the gear sprocket 400, thus facilitating the insertion of the bushing 300 into the cylinder body 101 and also facilitating the complete removal of the bushing 300 from the cylinder body 101.

[0080] It should be noted that the bushing 300 can also have a square hole and the outer peripheral wall of part of the central shaft 200 can be square. In this way, the central shaft 200 and the bushing 300 can also be fixed relative to each other in the circumferential direction of the central shaft 200.

[0081] In some implementations, such as Figure 5 and Figure 7 As shown, the electro-hydraulic crankset assembly also includes:

[0082] The second bearing 600 is installed in the cylinder block 101 at the end away from the gear sprocket 400, and the central shaft 200 is installed in the second bearing 600;

[0083] The central shaft 200 has an abutment portion 202 on its outer peripheral wall, and the cylinder body 101 has a step 109 on its inner peripheral wall. The abutment portion 202 and the step 109 abut against the inner and outer rings of the second bearing 600 on the side closest to the chainring 400, respectively. The central shaft 200 is connected to a detachable first locking member 110, and the cylinder body 101 is connected to a detachable second locking member 111. The first locking member 110 and the second locking member 111 abut against the inner and outer rings of the second bearing 600 on the side furthest from the chainring 400, respectively.

[0084] The first locking member 110 can be a locking nut. The outer peripheral wall of the end of the central shaft 200 away from the crankshaft 400 is provided with external threads, and the first locking member 110 is threadedly connected to the end of the central shaft 200 away from the crankshaft 400. The outer peripheral wall of the second locking member 111 can be provided with external threads, and the inner peripheral wall of the end of the cylinder body 101 away from the crankshaft 400 can be provided with internal threads. The second locking member 111 is threadedly connected to the end of the cylinder body 101 away from the crankshaft 400.

[0085] In this embodiment, the inner ring of the second bearing 600 can be completely locked by the cooperation between the abutment part 202 and the first locking member 110, and the outer ring of the second bearing 600 can be completely locked by the cooperation between the step 109 and the second locking member 111. This makes the axial positioning effect of the central shaft 200 better. Moreover, the central shaft 200 is directly supported by the first bearing 500 and indirectly supported by the second bearing 600, which also makes the installation stability better.

[0086] It should be noted that the first locking member 110 can also be snapped into the central shaft 200, and the second locking member 111 can also be snapped into the cylinder body 101.

[0087] In some implementations, such as Figure 7 As shown, an annular recess 302 is formed on the inner side of the end of the bushing 300 away from the toothed plate 400. The annular recess 302 extends circumferentially along the bushing 300. When the bushing 300 slides toward the second bearing 600, the abutment portion 202 can extend into the annular recess 302.

[0088] In this embodiment, an annular recess 302 is formed on the inner side of the end of the bushing 300 away from the toothed plate 400. When the bushing 300 slides toward the second bearing 600, the abutment portion 202 can extend into the annular recess 302. This makes the movement path of the bushing 300 longer, and thus the movement path of the toothed plate 400 longer.

[0089] In some implementations, reference Figure 5 and Figure 7 As shown, the frame 700 may be provided with a third locking member 113 at both ends of the cylinder 101. The third locking member 113 limits the cylinder 101 to prevent the cylinder 101 from moving at will.

[0090] It should be noted that the third locking element 113 and the frame 700 can be connected by snap-fit ​​or thread.

[0091] In some implementations, see Figure 3 The electro-hydraulic crankset assembly also includes:

[0092] The position detection unit 800 is electrically connected to the control module 1010 and is used to obtain the position of the crankset 400 on the central axis 200.

[0093] In this embodiment, the current position of the chainring 400 can be directly determined by setting the position detection unit 800, which makes it easier for the control module 1010 to adaptively adjust the position of the chainring according to the current gear information of the freewheel 900. Usually, the chainring 400 will correspond as closely as possible to the gear corresponding to the current gear of the freewheel 900 to reduce the tilt angle of the chain.

[0094] The aforementioned position detection unit 800 can be configured in various ways. For example, a laser radar mounted on the frame 700 can be used to detect the distance between the frame 700 and the chainring 400, and then the position of the chainring 400 on the bottom bracket 200 can be determined by simple addition and subtraction. Alternatively, other non-contact sensors such as ultrasonic sensors can be used for detection. In addition, a displacement sensor 802 can be used to directly detect the movement distance of the piston 102. There are various specific detection methods, and no specific limitation is made in this embodiment.

[0095] In some implementations, reference Figure 5 , Figure 6 The position detection unit 800 includes:

[0096] Magnetic ring 801 is installed on piston 102 or bushing 300;

[0097] The magnetic field sensing unit is electrically connected to the control module 1010. The magnetic field sensing unit is located on the outside of the cylinder 101 and is used to detect the position of the magnetic ring 801.

[0098] After the magnetic ring 801 is installed on the piston 102 or the bushing 300, it can move synchronously with the piston 102 or the bushing 300. Since the toothed sprocket 400 moves synchronously with the bushing 300, the position information of the toothed sprocket 400 can be directly determined by the displacement or position information of the magnetic ring 801.

[0099] The aforementioned magnetic ring 801 can be made based on a permanent magnet.

[0100] The aforementioned magnetic field sensing unit can sense the changes in the magnetic field of the magnetic ring 801, thereby determining the relative position of the magnetic ring 801 with respect to the magnetic ring 801 sensing unit. Since the magnetic field sensing unit is fixedly installed outside the cylinder body 101, the position of the magnetic ring 801 can be determined.

[0101] The aforementioned magnetic field sensing unit can employ a linear detection unit, such as a linear Hall element or a linear magnetoresistive element. Using a linear element allows for better detection of the linear movement of the magnetic ring 801.

[0102] In some embodiments, the electro-hydraulic crankset assembly further includes:

[0103] The display unit 1020 is mounted on the frame 700 and is electrically connected to the control module 1010.

[0104] In this embodiment, by providing a display unit 1020 on the frame 700, the rider can easily understand the current position of the chainring 400 during riding, thereby facilitating the rider to improve the efficiency and accuracy of adjusting the chainring 400.

[0105] See Figure 3 As shown, one embodiment of this application provides a bicycle gear shifting system, including:

[0106] Such as the electro-hydraulic crankset assembly mentioned above;

[0107] The flywheel speed changer is connected to the control module 1010 and is used to adjust the gear position of the flywheel 900.

[0108] In this embodiment, the bicycle transmission system includes the electro-hydraulic chainring assembly as described above, and thus possesses the beneficial effects of the electro-hydraulic chainring assembly as described above, which will not be repeated here.

[0109] In this embodiment, the bicycle transmission system includes the electro-hydraulic chainring assembly as described above, and thus possesses the beneficial effects of the electro-hydraulic chainring assembly as described above, which will not be repeated here.

[0110] The aforementioned flywheel shifter can adjust the gear position of the flywheel 900, and can also feed back the current gear position information of the flywheel 900 to the control module 1010, so that the control module 1010 can adjust the position of the chainring according to the gear position information of the flywheel 900.

[0111] The aforementioned flywheel transmission device can be made using a commercially available, mature electronically controlled flywheel 900 transmission adjustment mechanism.

[0112] Understandably, when the flywheel derailleur does not have a memory function, the control module 1010 can memorize the gear change state according to control commands to determine the current gear position of the flywheel 900. Furthermore, to reduce the impact of accumulated errors, after each stop of riding, the flywheel 900 can be controlled to return to a specific gear, such as the intermediate gear.

[0113] In some implementations, see Figure 3 The bicycle gear system also includes:

[0114] The torque detection unit 1030 is electrically connected to the control module 1010 and is used to detect the output torque of human stepping.

[0115] The cadence detection unit 1040 is electrically connected to the control module 1010 and is used to detect the cadence of a human pedaling the crank.

[0116] The torque detection unit 1030 mentioned above can be a torque sensor, stress sensor, etc., and can be installed on the crank, bottom bracket 200, etc. to detect the torque generated by the rider pedaling the crank.

[0117] The aforementioned cadence detection unit 1040 can be a pressure sensor, angular velocity sensor, photoelectric sensor, contact sensor, etc., and can determine the rider's cadence by directly detecting the rotation frequency of structures such as the crank and chainring 400.

[0118] It should be noted that torque reflects the rider's effort level while riding; generally, the more effort is exerted, the greater the torque. Cadence directly reflects the rider's pedaling speed; generally, the faster the speed, the more effort is required. Based on the aforementioned principles, by combining the rider's torque and cadence, it is possible to effectively determine whether the rider is currently in a relatively strenuous state. When it is determined that the rider is exerting effort, the 900-speed flywheel is controlled to shift up a gear; when it is too easy, the 900-speed flywheel is controlled to shift down a gear. There are many ways to determine riding status using torque and cadence. For example, one can directly use the product of torque and cadence, and then use this product and a pre-set threshold or threshold range to determine whether the riding state is ideal. For instance, if the product is greater than the pre-set threshold or threshold range, one can shift up; if it is less than the pre-set threshold or threshold range, one can shift down. Of course, one can also introduce a weighting factor to perform a weighted calculation on torque and cadence, thereby obtaining a better calculated value for judging the pre-set threshold or threshold range in some scenarios (the aforementioned product can be understood as a calculated value). Then, the calculated value and the pre-set threshold or threshold range can be used to complete the judgment. There are many ways to use this method, and the user can choose the method according to their actual needs.

[0119] In some implementations, see Figure 3 The bicycle gear system also includes:

[0120] The human-machine interaction unit 1050 is communicatively connected to the control module 1010.

[0121] In this embodiment, taking into account the differences in individual physical fitness and the possibility that the bicycle may be used by multiple people, a human-computer interaction unit 1050 can be added to adjust the preset threshold or threshold range in order to better meet the usage needs of different cyclists.

[0122] It should be noted that, in the presence of other smart terminals, cyclists can also transmit instructions to the control module 1010 to modify the preset threshold or threshold range through other smart terminals, thereby completing the adjustment of the preset threshold or threshold range.

[0123] In some embodiments, the torque detection unit 1030 is disposed on the crank and / or chainring 400 and / or bottom bracket 200; and / or,

[0124] The cadence detection unit 1040 is mounted on the crank and / or chainring 400 and / or bottom bracket 200.

[0125] The torque detection unit 1030 can be installed on the crank, chainring 400, or bottom bracket 200. Theoretically, it can detect torque. Although the values ​​obtained by direct detection may be different depending on the location, they can all be preprocessed through simple mathematical operations to obtain the output torque that can represent the rider's pedaling force.

[0126] The torque detection unit 1030 may include multiple torque sensors. In this case, torque sensors can be set at multiple locations in the crank, chainring 400, and bottom bracket 200. After normalization, the mean value can be calculated to obtain the torque closest to the real value and eliminate the error caused by the acquisition of a single sensor.

[0127] The torque detection unit 1030 can be installed on the crank, chainring 400, or bottom bracket 200. Theoretically, it can detect torque. Although the values ​​obtained by direct detection are different depending on the location, they can all be obtained by simple preprocessing to represent the torque generated by the rider pedaling.

[0128] The aforementioned cadence detection unit 1040 may include multiple cadence sensors. In this case, torque sensors can be set at multiple locations in the crank, chainring 400, and bottom bracket 200. After normalization, the mean value can be calculated to obtain the cadence closest to the real one, eliminating the error caused by the acquisition of a single sensor.

[0129] In some implementations, see Figure 3 The bicycle gear system also includes:

[0130] Lactic acid detection device 1060, communicatively connected to control module 1010, is used to detect lactic acid in the human body; and / or,

[0131] The heart rate detection device 1070 is communicatively connected to the control module 1010 and is used to detect human heart rate.

[0132] In this embodiment, considering that lactic acid and heart rate can effectively reflect the functional state of the human body, a lactic acid detection device 1060 is introduced to detect the cyclist's lactic acid, and a heart rate detection device 1070 is introduced to detect the heart rate. This allows for timely downshifting when lactic acid levels are high and heart rate is high, thus avoiding injury to the cyclist.

[0133] In addition, the lactate detected by the lactate detection device 1060 and / or the heart rate detected by the heart rate detection device 1070 can also be considered in combination with the aforementioned cadence and torque. For example, the gear control can be performed by using the product of the three or four, or by using the weighted calculation result of the three or four. The specific control method can refer to the aforementioned cadence and torque control method.

[0134] In some implementations, see Figure 3 The bicycle gear system also includes:

[0135] The blood pressure detection device 1080 is communicatively connected to the control module 1010 and is used to detect human blood pressure.

[0136] In this embodiment, considering that blood pressure can effectively reflect the functional state of the human body, a blood pressure detection device 1080 is introduced to detect the rider's blood pressure, so that when the blood pressure is too high, the gear can be downshifted in time to avoid injury to the rider.

[0137] In addition, the heart rate detected by the blood pressure monitoring device 1080 can also be considered in conjunction with the aforementioned cadence and torque. For example, the product of the three and the weighted sum of the three can be used to calculate the gear control. The specific control method can refer to the aforementioned cadence and torque control method.

[0138] It should be noted that lactate, heart rate, and blood pressure can be selectively combined with cadence and torque according to actual needs. You can choose one of them to combine with cadence and torque, or you can choose multiple parameters. When multiple parameters are selected, they can be comprehensively considered with the cadence and torque obtained above. For example, you can use the product of all selected parameters, or the weighted calculation result of all selected parameters, to control the gear. For specific control methods, please refer to the above-mentioned cadence and torque control methods.

[0139] In some implementations, the lactate detection device 1060, the heart rate detection device 1070, and the blood pressure detection device 1080 can all be installed on a smart wearable device, and the collected data can be transmitted to the control module 1010 via wireless communication through the smart wearable device.

[0140] The lactate detection device 1060, heart rate detection device 1070, and blood pressure detection device 1080 mentioned above can all be directly adopted from commercially available products.

[0141] In some implementations, the lactate detection device 1060, heart rate detection device 1070, and blood pressure detection device 1080 can be equipped with separate detection modules. These detection modules can be connected to the control module 1010 via data cables. When in use, the detection modules are installed on the cyclist, and when not in use, they can be hung on the bicycle.

[0142] This application also provides a bicycle that includes the electro-hydraulic chainring assembly described above. Because the bicycle has the electro-hydraulic chainring assembly, it possesses all the beneficial effects of such an assembly.

[0143] The above are merely specific embodiments of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. An electro-hydraulic crankset assembly, characterized in that, include: A hydraulic cylinder, comprising a cylinder body and a piston, the cylinder body being mounted on a vehicle frame; 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. A hydraulic cavity is formed between the inner circumferential wall of the cylinder and the outer circumferential wall of the bushing. The piston is slidably installed in the hydraulic cavity along the axial direction of the central shaft. The piston is connected to the bushing. The toothed disc is connected to one end of the bushing; The first bearing is installed inside the hydraulic cavity and sleeved on the bushing; A servo hydraulic station is used to adjust the injection state of the hydraulic oil entering the cylinder so that the piston moves axially along the central shaft and drives the bushing to move synchronously. The control module is electrically connected to the servo hydraulic station and is used to control the operation of the servo hydraulic station.

2. The electro-hydraulic crankset assembly according to claim 1, characterized in that, The inner peripheral wall of the cylinder is formed with an annular groove, which surrounds the bushing and forms the hydraulic cavity between the bushing and the outer peripheral wall of the bushing. The piston is annular and extends circumferentially along the bushing to divide the hydraulic cavity into a first cavity and a second cavity along the axial direction of the central axis. Both the first cavity and the second cavity are provided with a connecting hole for connecting an oil pipe.

3. The electro-hydraulic crankset assembly according to claim 2, characterized in that, The servo hydraulic station includes: A servo hydraulic pump is connected to the communication holes provided on the first cavity and the second cavity through the oil pipe; A control valve assembly is used to adjust the state of the servo hydraulic pump injecting hydraulic oil into the first chamber and the second chamber; both the control valve assembly and the servo hydraulic pump are electrically connected to the control module.

4. The electro-hydraulic crankset assembly according to claim 2, characterized in that, 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 annular groove is formed between the first annular limiting part and the second annular limiting part.

5. The electro-hydraulic crankset assembly according to claim 4, characterized in that, One end of the bushing is connected to a detachable 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 opposite to the toothed disc, the inner peripheral wall of the cylinder protrudes to form the first annular limiting part, the second annular limiting part is detachable, and can be removed from the end of the cylinder near the toothed disc after disassembly.

6. The electro-hydraulic crankset assembly according to claim 1, characterized in that, The piston is detachably connected to the bushing.

7. The electro-hydraulic crankset assembly according to claim 1, characterized in that, The electro-hydraulic crank assembly also includes: The position detection unit is electrically connected to the control module and is used to obtain the position of the dental disc on the central axis.

8. The electro-hydraulic crankset assembly according to claim 7, characterized in that, The position detection unit includes: A magnetic ring is installed on the piston or bushing; A magnetic field sensing unit is electrically connected to the control module. The magnetic field sensing unit is located on the outside of the cylinder body and is used to detect the position of the magnetic ring.

9. A bicycle gear shifting system, characterized in that, include: The electro-hydraulic crank assembly as described in any one of claims 1 to 8; The flywheel speed changer is electrically connected to the control module and is used to adjust the flywheel's gear position.

10. A bicycle, characterized in that, Includes the electro-hydraulic crank assembly as described in any one of claims 1 to 8.

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