Electric crankset device and bicycle

Abstract

According to the electric crankset device and the bicycle, a movable shaft sleeve is arranged on a middle shaft, a crankset is arranged on the shaft sleeve, then an electric control module can control an electric control driving unit to drive the crankset to move along the middle shaft, and finally when a flywheel of the bicycle is subjected to gear change, the crankset is driven to move along the middle shaft. The electric control driving unit can be used for driving the chain wheel to carry out adaptive adjustment along with the gear change of the bicycle, so that the included angle between the chain and the chain wheel is effectively reduced, and the riding efficiency of a bicycle user is improved. In addition, due to the fact that the included angle is decreased, the meshing cut-in range of the chain and the teeth is wider, chain falling caused by returning can be reduced, asymmetric abrasion of the tooth parts is reduced, axial stress of the tooth parts is reduced, tooth deformation can be reduced, and the service life can be prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of bicycles, in particular to an electric sprocket device and a bicycle. BACKGROUND

[0002] Under the current gear shifting technology system, when a rider operates a variable speed bicycle to shift gears, the chain will flexibly switch between different levels of freewheel gears. The angle between the chain and the sprocket, and the angle between the chain and the freewheel, will also change with the change of the gear position. The more the angle deviates from the ideal zero degree state, the more the driving force transmitted by the chain will be affected by the existence of the angle, resulting in a significant reduction in the effective power driving the freewheel to rotate, and the riding efficiency will also be significantly reduced. CONTENT OF THE UTILITY MODEL

[0003] The present application aims to provide an electric sprocket device and a bicycle that can improve the riding efficiency of the bicycle user.

[0004] The electric sprocket device according to the first aspect of the present application comprises:

[0005] A middle shaft for rotating installation on a frame;

[0006] A shaft sleeve sleeved on the middle shaft and movable along the axial direction of the middle shaft, the shaft sleeve and the middle shaft being relatively fixed in the circumferential direction of the middle shaft;

[0007] A sprocket provided on the shaft sleeve;

[0008] A telescopic mechanism provided in the middle shaft and connected to the shaft sleeve and / or the sprocket;

[0009] An electric control driving unit provided on the frame for driving the telescopic mechanism to operate, so that the telescopic mechanism drives the shaft sleeve to move along the axial direction of the middle shaft, and the shaft sleeve is rotatable relative to the telescopic mechanism;

[0010] An electric control module electrically connected to the electric control driving unit.

[0011] The bicycle according to the second aspect of the present application comprises the electric sprocket device according to the first aspect.

[0012] The electric toothed disc device and the bicycle of the embodiments of the present application can drive the toothed disc to move along the middle shaft by the electric control module controlling the electric control driving unit, so that the toothed disc can be adjusted adaptively when the bicycle freewheel changes the gear position, so as to effectively reduce the included angle between the chain and the toothed disc, thereby improving the riding efficiency of the bicycle user. In addition, because the included angle is reduced, the meshing cutting range of the chain and the tooth is wider, which can reduce the chain falling back, reduce the asymmetric wear of the tooth part, reduce the axial force of the tooth part, and is beneficial to reducing the deformation of the tooth, thereby prolonging the service life.

[0013] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent from the description, or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0014] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0015] Figure 1 A schematic view of the cooperation between the conventional toothed disc and the freewheel;

[0016] Figure 2 A schematic view of the cooperation between the toothed disc and the freewheel provided by the embodiments of the present application;

[0017] Figure 3 A schematic view of the overall structure of the electric toothed disc device provided by the embodiments of the present application;

[0018] Figure 4 A partial sectional view of the electric toothed disc device provided by the embodiments of the present application;

[0019] Figure 5 An electrical system diagram of the electric toothed disc device provided by the embodiments of the present application.

[0020] LIST OF REFERENCE NUMERALS

[0021] Middle shaft 100; mounting cavity 101; let-out slot 102; limiting protrusion 103;

[0022] Shaft sleeve 200;

[0023] Toothed disc 300;

[0024] Telescopic mechanism 400; connecting piece 401;

[0025] First bearing 500; axial locking structure 501; first locking plug 502; first sealing ring 503;

[0026] Second bearing 600; second locking plug 601; second sealing ring 602;

[0027] Assembly seat 700; mounting hole 701; accommodation cavity 702;

[0028] Frame 800;

[0029] First medium conveying pipe 900; second medium conveying pipe 901; electric control driving unit 902; rotary joint 903;

[0030] Crank connecting shaft 1000;

[0031] Flywheel 1100;

[0032] Electric control module 1201; display unit 1202; position detection unit 1203; power storage unit 1204; wireless communication module 1205. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be described in detail below, examples of which are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary only, and are used only for explaining the present application, and cannot be understood as a limitation of the present application.

[0034] In the description of the present application, if there is a description to first, second, etc., it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0035] In the description of the present application, it should be understood that the orientation description, such as up, down, etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0036] In the description of the present application, it should be noted that, unless otherwise explicitly limited, the words such as setting, mounting, connecting, etc. should be broadly understood, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical solution.

[0037] The technical solutions of the present application will be described in detail below in combination with the drawings. Obviously, the following described embodiments are only part of the embodiments of the present application, not all embodiments.

[0038] For better description of the electric toothed disc device and bicycle of the embodiments of the present application, the angle change between the chain and the toothed disc 300 during the traditional gear adjustment process of the bicycle is briefly described herein. 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 toothed disc 300, because of the existence of the θ angle, the driving force of the chain will have a large axial component that cannot be used to drive the freewheel 1100 to rotate, thereby causing energy waste. It can be understood that the larger the θ angle is, the more energy is wasted. 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 the middle can be understood as the position of the toothed disc 300 before moving, and the solid rectangular frame can be understood as the position of the toothed disc 300 after moving. The included angle is β after moving, and the β angle is obviously smaller than the θ angle, thereby effectively reducing the axial component.

[0039] The electric toothed disc device and bicycle of the embodiments of the present application are described below based on the above scenario.

[0040] Referring to Figures 3 to 5 , the electric toothed disc device provided by an embodiment of the present application includes:

[0041] A middle shaft 100 for rotating a toothed disc 300 installed on a frame 800;

[0042] A shaft sleeve 200 sleeved on the middle shaft 100 and movable along the axial direction of the middle shaft 100, the shaft sleeve 200 and the middle shaft 100 are relatively fixed in the circumferential direction of the middle shaft 100;

[0043] A toothed disc 300 arranged on the shaft sleeve 200;

[0044] A telescopic mechanism 400 arranged in the middle shaft 100 and connected to the shaft sleeve 200 and / or the toothed disc 300;

[0045] An electric control driving unit 902 arranged on the frame 800, for driving the telescopic mechanism 400 to operate, so that the telescopic mechanism 400 drives the shaft sleeve 200 to move along the axial direction of the middle shaft 100, and the shaft sleeve 200 can rotate relative to the telescopic mechanism 400;

[0046] An electric control module 1201 electrically connected to the electric control driving unit 902.

[0047] In the embodiments of the present application, the movable sleeve 200 is arranged on the central shaft 100, and the tooth disc 300 is arranged on the sleeve 200. Then, the electric control module 1201 can control the electric control driving unit 902 to drive the tooth disc 300 to move along the central shaft 100. Finally, when the gear position of the bicycle freewheel 1100 changes, the electric control driving unit 902 can be used to drive the tooth disc 300 to adaptively adjust according to the change of the bicycle gear position, so as to effectively reduce the included angle between the chain and the tooth disc 300, thereby improving the riding efficiency of the bicycle user. In addition, because the included angle is reduced, the meshing cutting range of the chain and the tooth is wider, which can reduce the chain falling back, reduce the asymmetric wear of the tooth part, reduce the axial stress of the tooth part, and is beneficial to reduce the deformation of the tooth, thereby prolonging the service life.

[0048] The above-mentioned central shaft 100 can be installed on the frame 800 through the assembly seat 700. Specifically, the assembly seat 700 can be installed with a bearing system, and the central shaft 100 is installed on the bearing system to enable the central shaft 100 to rotate. In addition, the two ends of the central shaft 100 can be provided with crank connecting shafts 1000 for connecting cranks, and the cranks are used to install pedals. The bicycle user rotates the crank through the pedal, and then drives the central shaft 100 to rotate.

[0049] The above-mentioned sleeve 200 is sleeved on the outside of the central shaft 100 and can move along the central shaft 100. After the tooth disc 300 is fixed on the sleeve 200, the tooth disc 300 can move along the central shaft 100, so as to adjust the relative position of the tooth disc 300 and the central shaft 100. The sleeve 200 and the central shaft 100 are relatively fixed in the circumferential direction, so that when the central shaft 100 rotates, the sleeve 200 can be driven to rotate, thereby driving the tooth disc 300 to rotate.

[0050] In addition, the length of the sleeve 200 can be flexibly adjusted according to actual needs. For example, as shown in Figure 4 the length of the sleeve 200 can be extended to between the central shaft 100 and the bearing system for installing the central shaft 100 when the length is designed to be longer. When the length is designed to be shorter, the sleeve 200 can not be extended to between the central shaft 100 and the bearing system for installing the central shaft 100, and the whole is kept outside the bearing system. It should be noted that the sleeve 200 has advantages in length. When the demand for moving and driving the tooth disc 300 is small, the sleeve 200 with shorter length can be considered.

[0051] The telescopic mechanism 400 is installed in the middle shaft 100, and can be connected to the shaft sleeve 200, the toothed disc 300, or both the shaft sleeve 200 and the toothed disc 300. The telescopic direction of the telescopic mechanism 400 can be the axial direction of the middle shaft 100 or slightly deviated from the axial direction of the middle shaft 100. The telescopic mechanism 400 can drive the shaft sleeve 200 to move by telescoping, and then adjust the relative position between the toothed disc 300 and the middle shaft 100, and then adjust the relative position between the toothed disc 300 and the flywheel 1100, so as to adjust the included angle between the chain and the toothed disc 300.

[0052] The electric control driving unit 902 can drive the telescopic mechanism 400 to operate, so as to drive the shaft sleeve 200 and / or the toothed disc 300 to move by telescoping of the telescopic mechanism 400, so as to adjust the relative position between the toothed disc 300 and the flywheel 1100, and then adjust the included angle between the chain and the toothed disc 300.

[0053] The electric control driving unit 902 is controlled by the electric control module 1201, that is, the electric control module 1201 can operate the electric control driving unit 902 to work.

[0054] Specifically, the electric control driving unit 902 has different settings according to different types of telescopic mechanisms 400. For example, when the telescopic mechanism 400 is a hydraulic cylinder, the electric control driving unit 902 can be a hydraulic driving system, and the electric control module 1201 can drive the piston rod of the hydraulic cylinder to telescope by adjusting the injection of the hydraulic driving system into the rodless cavity and the rod cavity of the hydraulic cylinder. When the telescopic mechanism 400 is a pneumatic cylinder, the electric control driving unit 902 can be a pneumatic driving system, and the electric control module 1201 can adjust the working state of the pneumatic cylinder by adjusting the inflation state of the pneumatic driving system. When the telescopic mechanism 400 is an electric push rod, the electric control driving unit 902 can be a power supply unit, and the electric control module 1201 can adjust the telescoping state of the electric push rod by adjusting the power supply state of the power supply unit. In some scenarios, the power supply unit can only participate in power supply, and the electric control module 1201 directly sends a control signal to the electric push rod for telescoping control. The specific selection can be adjusted according to actual needs.

[0055] The electric control module 1201 can adopt electric control devices such as electromagnetic valves and electric control switches to realize manual direct control of operation. At this time, the electric control module 1201 can be adjusted by the user according to the riding feeling of the user.

[0056] The electric control module 1201 described above can also directly realize automatic adjustment of the position of the shaft sleeve 200, so that the tooth disc 300 is always in an optimal relative position with the flywheel 1100. For example, when there is no position detection function, the power-on duration of the electric control driving unit 902 can be directly controlled to complete the position adjustment of the tooth disc 300. For example, power-on for 1S can move a displacement corresponding to one gear position. At the same time, in order to more accurately complete the displacement control of the tooth disc 300, the tooth disc 300 can be controlled to return to zero position (for example, the leftmost end or the rightmost end) after each stop of use of the bicycle, so as to avoid cumulative errors.

[0057] The driving mechanism composed of the electric control driving unit 902 and the telescopic mechanism 400 is a mechanism that is actively adjusted, and therefore, the movement of the shaft sleeve 200 can be limited, that is, the shaft sleeve 200 will not be passively moved due to the traction of the chain, thereby improving the stability of riding.

[0058] In some embodiments, the electric tooth disc device further comprises:

[0059] The display unit 1202 is arranged on the frame 800 and is electrically connected with the electric control module 1201.

[0060] In the embodiment, by arranging the display unit 1202 on the frame 800, the rider can know the current position of the tooth disc 300 during riding, thereby improving the efficiency and accuracy of the rider in adjusting the tooth disc 300.

[0061] In some embodiments, the electric tooth disc device further comprises:

[0062] The position detection unit 1203 is electrically connected with the electric control module 1201 and is used to acquire the position of the tooth disc 300 on the central shaft 100.

[0063] In the embodiment, by arranging the position detection unit 1203, the current position of the tooth disc 300 can be directly determined, and then the electric control module 1201 can adjust the position of the tooth disc 300 according to the current gear position information of the flywheel 1100. Generally, the tooth disc 300 will correspond to the gear corresponding to the current gear position of the flywheel 1100 as much as possible, so as to reduce the inclination angle of the chain.

[0064] The position detection unit 1203 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 toothed disc 300, and then the position of the toothed disc 300 on the central shaft 100 can be determined by simple addition and subtraction operation. Alternatively, an ultrasonic sensor or other non-contact sensor can be used for detection. In addition, a displacement sensor can be used to directly detect the extension distance of the telescopic end of the telescopic mechanism 400. The specific detection method is not limited in the embodiment.

[0065] In some embodiments, the position detection unit 1203 includes a displacement sensor electrically connected to the electronic control module 1201, and the displacement sensor is used to detect the extension distance of the telescopic end of the telescopic mechanism 400.

[0066] In the embodiment, the displacement sensor is used to directly detect the extension distance of the telescopic end of the telescopic mechanism 400, for example, the extension distance of the piston rod of the hydraulic cylinder or the screw rod of the electric push rod. This can effectively reduce the interference of external factors on detection, improve the accuracy of detection, and effectively reduce the damage of external impact to the position detection unit 1203.

[0067] In some embodiments, the electric toothed disc device further includes:

[0068] The power storage unit 1204 is used to provide power for the electric control driving unit 902 and the electronic control module 1201.

[0069] In the embodiment, the power storage unit 1204 is directly used as a power supply, for example, a lithium battery or other storage battery. This can effectively improve the user experience, and the user does not need to use an external mobile power supply for power supply.

[0070] In some embodiments, the electric control driving unit 902 and the electronic control module 1201 can be powered by a mobile power supply.

[0071] In some embodiments, the electric toothed disc device further includes:

[0072] The wireless communication module 1205 is electrically connected to the electronic control module 1201.

[0073] The wireless communication module 1205 can realize wireless communication with the outside world. For example, the current relative position of the toothed disc 300 can be transmitted to the outside world through the wireless communication module 1205. In addition, the operation data collected by the electronic control module 1201 on the remaining bicycles can be uploaded to the cloud for storage and record, so as to provide more in-depth services for users in the future.

[0074] The wireless communication module 1205 can be a Bluetooth module, a WIFI module, etc. The specific type can be selected according to actual needs.

[0075] In some embodiments, the electric toothed disc device further comprises:

[0076] The assembly seat 700 is arranged on the frame 800, and the assembly seat 700 is provided with a mounting hole 701. The middle shaft 100 is rotatably arranged in the mounting hole 701. 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 extends into the clearance cavity 702.

[0077] 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 arranged on the frame 800 by fasteners. The assembly seat 700 is provided with a mounting hole 701 extending in the horizontal direction. The two ends of the mounting hole 701 can be throughly arranged. The middle shaft 100 can be arranged in the mounting hole 701 through a bearing system, so that the middle shaft 100 can rotate. The outer diameter of the middle shaft 100 can be smaller than the hole diameter of the mounting hole 701 near the toothed 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. When the shaft sleeve 200 moves to any position along the axial direction of the middle shaft 100, part of the structure of the shaft sleeve 200 extends into the clearance cavity 702. When the shaft sleeve 200 moves to a part of the position in the direction close to the assembly seat 700, part of the structure of the shaft sleeve 200 extends into the clearance cavity 702. When the shaft sleeve 200 moves to a part of the position in the direction away from the assembly seat 700, the shaft sleeve 200 is located outside the one end of the assembly seat 700 as a whole. The specific length of the shaft sleeve 200 can be flexibly adjusted according to actual needs, which will not be described here.

[0078] In the embodiment, the entire electric toothed disc device can be arranged as an assembly structure, so that the entire electric toothed disc device can be quickly installed and replaced through the assembly seat 700, thereby providing better use experience for users. In addition, compared with the shaft sleeve 200 which can only move back and forth outside the one end of the assembly seat 700, in the present 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. Therefore, not only the moving path of the shaft sleeve 200 is longer, so that the adjustment range of the toothed disc 300 along the axial direction of the middle shaft 100 is 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. The shaking of the toothed disc 300 can be reduced, thereby further improving the riding experience.

[0079] 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 since the distance between the end of the shaft 100 and the assembly seat 700 is certain, in order to make the shaft sleeve 200 move along the axial direction of the shaft 100 by a displacement, the length of the shaft sleeve 200 can only be set to be short, so that not only the structural strength is low, but also the stability is poor, the tooth disc 300 is easy to shake, and the riding experience is affected. In the present 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, which can effectively solve the above problems.

[0080] In some embodiments, 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 along 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.

[0081] In the present embodiment, such setting not only makes the shaft sleeve 200 extend along the axial direction of the shaft 100 longer, and further makes the structural strength of the shaft sleeve 200 higher, and at the same time, the installation stability of the shaft sleeve 200 is better, which can reduce the shaking of the tooth disc 300, thereby further improving the riding experience. In addition, it can also avoid the interference between the shaft sleeve 200 and the assembly seat 700 when the shaft sleeve 200 enters the accommodation cavity 702, thereby making the movement of the shaft sleeve 200 more smooth.

[0082] In some embodiments, the electric tooth disc device further comprises:

[0083] The first bearing 500 is installed at the end of the mounting hole 701 away from the tooth disc 300;

[0084] The second bearing 600 is installed at the end of the mounting hole 701 close to the tooth disc 300;

[0085] The shaft 100 is rotatably installed in the first bearing 500 and the second bearing 600.

[0086] In the present embodiment, the rotation of the shaft 100 can be realized by using the first bearing 500 and the second bearing 600, which meets the rotation requirement of the shaft 100, and makes the rotation of the shaft 100 more smooth.

[0087] In some embodiments, as shown in Figure 4As shown, a limiting protrusion 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. Meanwhile, 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 to realize the restriction of the first bearing 500 in the other direction, and also to complete the restriction of the movement of the middle shaft 100 in the axial direction. 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. 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. The axial locking is arranged in the snap ring.

[0088] In some embodiments, as shown in Figure 4 As shown, 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. 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. 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.

[0089] 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.

[0090] In some embodiments, the first bearing 500 can be a ball bearing.

[0091] In this embodiment, the ball bearing has the characteristics of strong axial bearing capacity, which can better bear the axial force when the tooth disc 300 moves. Moreover, the middle shaft 100 can be better fixed through the ball bearing.

[0092] It should be noted that the first bearing 500 can also be other suitable types of bearings, which will not be described here.

[0093] In some embodiments, the second bearing 600 is arranged as a needle bearing and is sleeved on the outer side of the shaft sleeve 200. The shaft sleeve 200 can move relative to the second bearing 600 in the axial direction of the middle shaft 100.

[0094] The second bearing 600 can be a needle bearing without an inner ring, and the end of the shaft sleeve 200 away from the gear disc 300 can extend into the second bearing 600 as the inner ring of the second bearing 600.

[0095] In the embodiment, the shaft sleeve 200 extends into the second bearing 600 and can rotate relative to the second bearing 600, thereby reducing the circumferential friction on the outer circumferential wall of the shaft sleeve 200, making the rotation of the shaft sleeve 200 more smooth, thereby improving the riding efficiency. In addition, since the second bearing 600 is arranged as a needle bearing, the shaft sleeve 200 can move along the axial direction of the central shaft 100 relative to the second bearing 600, thereby reducing the axial friction on the outer circumferential wall of the shaft sleeve 200, making the shaft sleeve 200 move along the axial direction of the central shaft 100 more smooth, and the gear disc 300 shift more smoothly. In addition, the shaft sleeve 200 can also support the second bearing 600, making the second bearing 600 more stable.

[0096] It should be noted that the second bearing 600 can also be other suitable types of bearings, which will not be described here.

[0097] In some embodiments, 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 circumferential 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 gear disc 300.

[0098] The mounting cavity 101 can extend along the axial direction of the central shaft 100. Taking 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 gear disc 300, and the second cavity can be arranged close to the gear 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.

[0099] The outer circumferential wall of the central shaft 100 is provided with a displacement slot 102 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. The connecting piece 401 is connected with the shaft sleeve 200 and / or the gear disc 300, and can also guide the connecting piece 401 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.

[0100] The above-mentioned accommodation slot 102 can be provided on the outer peripheral wall of the middle shaft 100 near the side of the shaft sleeve 200. Providing multiple accommodation slots 102 can increase the connection stability between the connecting piece 401 and the shaft sleeve 200 and / or the toothed disc 300. As shown in the drawings, the middle shaft 100 is provided with two accommodation slots 102, and the upper and lower parts of the inner wall of the shaft sleeve 200 are connected to the connecting piece 401 through the accommodation slots 102. Figure 4

[0101] In the present embodiment, the installation cavity 101 is provided, which not only protects the telescopic mechanism 400 and avoids damage caused by exposure of the telescopic mechanism 400, but also makes the telescopic mechanism 400 closer to the axis of the middle shaft 100, generates smaller centrifugal force, further causes smaller resistance to the rotation of the middle shaft 100, makes the rotation of the middle shaft 100 more smooth, and further improves the riding efficiency of the bicycle user.

[0102] In some embodiments, the telescopic mechanism 400 is provided as a hydraulic cylinder or a pneumatic cylinder, and the electric toothed disc device further comprises:

[0103] A first medium conveying pipe 900 is connected to the telescopic mechanism 400.

[0104] A second medium conveying pipe 901 is rotatably connected to the first medium conveying pipe 900, and the second medium conveying pipe 901 is used to connect an electric control driving unit 902.

[0105] The telescopic mechanism 400 is a hydraulic cylinder or a pneumatic cylinder, which has simple structure, convenient installation, and good telescopic effect.

[0106] It should be noted that the telescopic mechanism 400 can also have other structures, for example, it can also be an electric push rod, which will not be described here.

[0107] Taking the telescopic mechanism 400 as an oil cylinder in a hydraulic cylinder as an example, the frame 800 can further be provided with an electric control driving unit 902 composed of an oil pump, an oil conveying pipe, an oil tank, an electromagnetic valve and the like. The oil pump is arranged between the oil tank and the oil cylinder through the oil conveying 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 and contraction.

[0108] ​The electric control driving unit 902 can be mounted on the frame 800 or the assembly seat 700. When the telescopic mechanism 400 is a hydraulic cylinder, the electric control driving unit 902 can include 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 a pneumatic cylinder, the electric control 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 communicate with the rodless cavity and the rod cavity. The second medium conveying pipe 901 can be two and both are 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. The ends of the two second medium conveying pipes 901 away from the first medium conveying pipes 900 are connected to the electric control driving unit 902.

[0109] In the embodiment, the electric control driving unit 902 injects or extracts the driving medium such as oil into or from the rodless cavity and 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 realize the telescoping of the telescopic mechanism 400. The structure is simple and the operation is convenient. In addition, the second medium conveying pipe 901 is rotationally connected with the first medium conveying pipe 900, so as to avoid the interference between the second medium conveying pipe 901 and the first medium conveying pipe 900 when the first medium conveying pipe 900 rotates with the central shaft 100, and the connectivity between the second medium conveying pipe 901 and the first medium conveying pipe 900 is better.

[0110] In some embodiments, the electric toothset further comprises:

[0111] The assembly seat 700 is arranged on the frame 800. The assembly seat 700 is provided with a mounting hole 701. The central shaft 100 is rotationally arranged 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. The outside of the central shaft 100 is sleeved with a rotary joint 903. The first medium conveying pipe 900 is connected with the second medium conveying pipe 901 through the rotary joint 903.

[0112] 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 include 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 with the central shaft 100 and connected with the first medium conveying pipe 900. The outer sleeve can be fixedly connected with the assembly seat 700 and connected with the second medium conveying pipe 901. The first medium conveying pipe 900 and the second medium conveying pipe 901 both communicate with the annular channel.

[0113] In this embodiment, the communication between the first medium conveying pipe 900 and the second medium conveying pipe 901 is realized through the annular channel of the rotary joint 903, and the relative rotation between the inner sleeve and the outer sleeve of the rotary joint 903 further realizes the rotary connection between the second medium conveying pipe 901 and the first medium conveying pipe 900, which is simple in structure, good in sealing, and has better practicability, because the second medium conveying pipe 901 can communicate with the first medium conveying pipe 900 when the middle shaft 100 rotates to any angle.

[0114] It should be noted that in some embodiments, 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 surrounds 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, and the first medium conveying pipe 900 and the second medium conveying pipe 901 both communicate with the annular channel, so as to realize the rotary connection between the second medium conveying pipe 901 and the first medium conveying pipe 900. 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 surrounds 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, and the first medium conveying pipe 900 and the second medium conveying pipe 901 both communicate with the annular channel, so as to realize the rotary connection between the second medium conveying pipe 901 and the first medium conveying pipe 900. 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 both be provided with an annular groove, the two annular grooves are connected to form an annular channel, and the first medium conveying pipe 900 and the second medium conveying pipe 901 both communicate with the annular channel, so as to realize the rotary connection between the second medium conveying pipe 901 and the first medium conveying pipe 900.

[0115] It can be understood that the first medium conveying pipe 900 can be directly arranged on the middle shaft 100, and the second medium conveying pipe 901 can be directly arranged on the assembly seat 700, or a first medium conveying channel can be arranged on the middle shaft 100, the first medium conveying channel serving as part of the structure of the first medium conveying pipe 900, and a second medium conveying channel can be arranged on the assembly seat 700, the second medium conveying channel serving as part of the structure of the second medium conveying pipe 901.

[0116] In some embodiments, the length of the shaft sleeve 200 along the axial direction thereof is 1.2 to 3 times the moving stroke of the shaft sleeve 200.

[0117] The length of the bushing 200 along its own axial direction is 1.2 to 3 times the travel of the bushing 200. For example, the length of the bushing 200 along its own axial direction can be 1.2, 2, 2.5, 3 times, or other suitable multiples of the travel of the bushing 200. This not only avoids the bushing 200 being too long, resulting in a too low travel and thus affecting the shifting effect of the gearbox 300, but also avoids the bushing 200 being too short, resulting in a decrease in structural strength and unstable installation.

[0118] In some implementations, such as Figure 4 As shown, a key structure is installed between the central shaft 100 and the bushing 200, and the key structure restricts the relative rotation of the central shaft 100 and the bushing 200. For example, both the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with keyways, the keyways extending along the axial direction of the central shaft 100, and the key structure is installed in both keyways and can slide relative to the keyways along the axial direction of the central shaft 100. Alternatively, one of the outer peripheral wall of the central shaft 100 and the inner peripheral wall of the bushing 200 may be provided with a keyway, the keyway extending along the axial direction of the central shaft 100, and the key structure is installed in the other and extends into the keyway, the key structure being able to slide relative to the keyway along the axial direction of the central shaft 100.

[0119] In this embodiment, the key structure can restrict the relative rotation between the central shaft 100 and the bushing 200, thereby enabling the central shaft 100 to drive the toothed disc 300 on the bushing 200 to rotate.

[0120] This application also provides a bicycle that includes the electric chainring device as described above. Because the bicycle has the electric chainring device, it possesses all the beneficial effects of such a device.

[0121] 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 electric crankset device, characterized in that, include: The center axle is used for rotatable mounting to the chassis; A bushing is fitted onto the central shaft and can move along the axial direction of the central shaft. The bushing and the central shaft are fixed relative to each other in the circumferential direction of the central shaft. The toothed disc is disposed on the bushing; A telescopic mechanism is located inside the central shaft and connected to the bushing and / or the toothed disc; An electronically controlled drive unit is mounted on the vehicle frame and is used to drive the telescopic mechanism to operate, so that the telescopic mechanism can extend and retract to drive the bushing to move axially along the central shaft, and the bushing can rotate relative to the telescopic mechanism. The electronic control module is electrically connected to the electronic control drive unit.

2. The electric crankset device according to claim 1, characterized in that, The electric crankset also includes: The display unit is mounted on the vehicle frame and is electrically connected to the electronic control module.

3. The electric crankset device according to claim 1, characterized in that, The electric crankset also includes: The position detection unit is electrically connected to the electronic control module and is used to obtain the position of the dental disc on the central axis.

4. The electric crankset device according to claim 3, characterized in that, The position detection unit includes a displacement sensor electrically connected to the electronic control module, and the displacement sensor is used to detect the extension distance of the telescopic end of the telescopic mechanism.

5. The electric crankset device according to claim 1, characterized in that, The electric crankset also includes: An assembly seat is provided for mounting on the vehicle frame. The assembly seat has a mounting hole, and the central shaft is rotatably mounted in the mounting hole. A clearance cavity is formed between the wall of the mounting hole and the outer peripheral wall of the central shaft, and the clearance cavity allows the bushing to extend into it.

6. The electric crankset device according to claim 5, characterized in that, The electric crankset also includes: A first bearing is installed at the end of the mounting hole away from the toothed disc; The second bearing is installed at one end of the mounting hole near the toothed disc; The central shaft is rotatably mounted within the first bearing and the second bearing.

7. The electric crankset device according to claim 1, characterized in that, The central shaft has an installation cavity, the telescopic mechanism is installed in the installation cavity, the outer peripheral wall of the central shaft has a relief groove communicating with the installation cavity, the telescopic mechanism has a connector, the connector passes through the relief groove and is connected to the bushing and / or the gear plate.

8. The electric crankset device according to claim 1, characterized in that, The telescopic mechanism is configured as a hydraulic cylinder or a pneumatic cylinder, and the electric crankset device further includes: The first medium delivery pipe is connected to the telescopic mechanism; The second medium delivery pipe is rotatably connected to the first medium delivery pipe, and the second medium delivery pipe is used to connect to the electronic control drive unit.

9. The electric crankset device according to claim 8, characterized in that, The electric crankset also includes: An assembly base is provided for mounting on the vehicle frame. The assembly base is provided with mounting holes. The central shaft is rotatably mounted in the mounting holes. The first medium delivery pipe is located inside the central shaft. The second medium delivery pipe is located inside the assembly base. A rotary joint is sleeved on the outside of the central shaft. The first medium delivery pipe is connected to the second medium delivery pipe through the rotary joint.

10. A bicycle, characterized in that, Includes the electric crankset as described in any one of claims 1 to 9.

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