Bicycle driving device

Abstract

The invention relates to the technical field of bicycles, in particular to a bicycle driving device which comprises a bicycle frame, a bottom bracket is arranged on the bicycle frame, a middle shaft penetrates through the bottom bracket, any end, extending out of the bottom bracket, of the middle shaft is connected with a chain wheel, and an energy storage mechanism is arranged on one side of the chain wheel; the energy storage mechanism is rotationally connected with the middle shaft through the one-way driving bearing pack, the energy storage mechanism rotates reversely when the middle shaft rotates reversely, buffering and energy storage are conducted, and after energy stored by the energy storage mechanism reaches a certain degree, the bicycle is driven to run forwards through the reverse transmission mechanism; the bicycle has the advantages that through simple structural transformation, the bicycle can run forwards when the pedals are pedaled in the forward direction and the reverse direction, the buffering and assisting effects are achieved, the influence on the structure of the bicycle is small, the transformation difficulty is low, and the speed change of a rear wheel of the bicycle is not affected.

Description

Technical Field

[0001] The present invention relates to the technical field of bicycles, and particularly relates to a bicycle drive device. Background Art

[0002] Bicycling is a healthy and green way of traveling. Although most people now mainly travel by electric bicycles, bicycles are still the first choice for public transportation, shared travel, and scenic spots because of their low cost and no need for energy.

[0003] In the drive device of existing bicycles, when the user pedals forward, the bicycle moves forward. When pedaling backward, the flywheel of the bicycle does not transmit power through the ratchet pawl, and the flywheel rotates freely, losing the driving force. Therefore, a considerable number of scholars have studied this for various reasons. For example, the patent document with the application number 02117292.7 discloses a two-way pedaling system, which realizes that both forward pedaling and backward pedaling can make the bicycle move forward; the patent document with the application number 201920507458.4 discloses a positive and negative two-way pedaling bicycle drive device, which takes forward pedaling as the main driving method to drive the bicycle forward, and can also take backward pedaling as the secondary driving method to drive the bicycle forward.

[0004] When the pedaling direction changes from the habitual direction to the non-habitual direction, it is usually difficult for riders to exert force normally at the beginning. If they apply force to ride just after changing the direction, it is easy to cause joint injuries. Therefore, it is necessary to improve the existing drive device to avoid such situations. Summary of the Invention

[0005] To solve the above problems, an embodiment of the present invention provides a bicycle drive device. The purpose of the present invention is to set up a drive device with buffering, which not only ensures that the bicycle can move forward by pedaling forward and backward, but also can reduce the acting force at the initial stage of backward pedaling, make the pedaling action stable and then gradually increase the acting force, and gradually increase the riding acting force only after the pedaling state is stable, so as to avoid joint injuries.

[0006] To achieve the above purpose, the embodiment of the present invention specifically adopts the following technical solutions:

[0007] A bicycle drive device includes a frame, a bottom bracket and a flywheel are provided on the frame, a bottom bracket spindle is inserted into the bottom bracket, and a chainring is connected to any end of the bottom bracket spindle extending out of the bottom bracket. The chainring and the flywheel are driven by a chain, and an energy storage mechanism is provided on one side of the chainring;

[0008] The energy storage mechanism is rotatably connected to the central shaft via a one-way drive bearing set. The energy storage mechanism does not rotate or rotates in the forward direction with the central shaft when the central shaft rotates forward, rotates in the reverse direction and buffers and stores energy when the central shaft rotates in the reverse direction, and drives the bicycle to travel forward after the energy storage mechanism stores energy to a certain extent. The reverse transmission mechanism is rotatably connected to the frame. The reverse transmission mechanism switches the driving force direction of the reverse rotation of the energy storage mechanism and then transmits it to the rear wheel of the bicycle to make it rotate forward.

[0009] This technical solution is mainly used for buffering when pedaling backward. That is, when pedaling backward, since the energy storage mechanism has not stored energy yet, the pressure feedback is small, and the pedal can be easily rotated. Because the muscle force application parts and angles are different when pedaling forward and backward, a relatively light pedaling force within a certain time can effectively discharge lactic acid in the muscles, reduce fatigue, and can also quickly adjust the muscle force application angle to adapt to the new riding mode, and then gradually increase the pedaling force according to the energy storage situation of the coil spring, avoiding applying a large force at the beginning, which may cause muscle or joint injuries.

[0010] Further, the energy storage mechanism includes a coil spring and a housing. The housing is sleeved outside the coil spring. The inner wall of the housing is connected to the outer end of the coil spring, and a transmission gear for transmission is provided outside the housing.

[0011] The above solution mainly discloses the specific structure of the energy storage method. In addition to absorbing energy, this energy storage mechanism is also responsible for driving the flywheel of the bicycle to rotate forward through chain drive or shaft drive when the energy is stored to a certain extent, so that the bicycle moves forward.

[0012] Further, the one-way drive bearing set includes a first one-way bearing and a common bearing. The first one-way bearing allows the inner ring to rotate forward relative to the outer ring;

[0013] The inner end of the coil spring is connected to the central shaft via the first one-way bearing, and the housing is connected to the central shaft via the common bearing.

[0014] The above solution mainly discloses the specific composition of the one-way drive bearing set to ensure that the energy storage mechanism does not rotate or rotates in the forward direction with the central shaft when the central shaft rotates forward, and rotates in the reverse direction and buffers and stores energy when the central shaft rotates in the reverse direction.

[0015] Further, the one-way drive bearing set further includes a second one-way bearing. The second one-way bearing has the same direction as the first one-way bearing. The inner ring of the second one-way bearing is connected to the bottom bracket, and the outer ring of the second one-way bearing is connected to the inner end of the coil spring.

[0016] After the reverse riding ends and turns to forward riding, this solution can also assist in forward riding, reduce the force output during forward riding, and also helps to reduce fatigue and adjust muscle force application.

[0017] Preferably, the outer rings of the first one-way bearing and the second one-way bearing are jointly connected to the sleeve, and the inner end of the connecting coil spring of the sleeve is connected. The setting of the sleeve can reduce energy dissipation, make the tightening and releasing of the coil spring more stable, and reduce the failure rate.

[0018] Furthermore, the reverse transmission mechanism includes a one-way driving gear and a transmission shaft with bevel gears at both ends. The one-way driving gear is coaxial and in the same direction as the flywheel, and is used to drive the rear wheel of the bicycle to travel forward; the bevel gear at one end of the transmission shaft meshes with the one-way driving gear, and the other end meshes with the transmission teeth on the housing.

[0019] Specifically, a form of the reverse transmission mechanism is disclosed, that is, shaft transmission. This structure can achieve the function of converting the direction of force transmission through the meshing direction of the bevel gears on the transmission shaft. However, this mechanism still requires the flywheel and the one-way driving gear to drive the rear wheel of the bicycle, and its process and manufacturing costs are relatively high, and there are relatively large configurations and modifications to the structure of the bicycle; another solution can be adopted to overcome this technical problem.

[0020] Furthermore, the chainring is connected to the bottom bracket through a third one-way bearing, and the direction of the third one-way bearing is opposite to that of the first one-way bearing and the second one-way bearing.

[0021] Furthermore, the reverse transmission mechanism includes an external meshing gear and a sprocket. The external meshing gear meshes with the transmission teeth on the housing. The external meshing gear is coaxially connected to the sprocket, and the sprocket is drivingly connected to the chain.

[0022] The above solution only adjusts the structure at the bottom bracket, and at the same time uses the original chain drive. It is necessary to add a transmission shaft and a one-way driving gear, which simplifies the structure, reduces the transformation cost, and improves the compatibility.

[0023] Furthermore, a pressure wheel corresponding to the sprocket is provided on the other side of the chain to make the chain contact the sprocket well and avoid loosening.

[0024] Furthermore, the pressure wheel, the external meshing gear and the sprocket are all rotatably connected to the frame.

[0025] The beneficial effects of the embodiments of the present invention are as follows:

[0026] 1. On the premise that the present invention can also make the bicycle travel forward during reverse riding, it also uses the energy storage mechanism to store energy and buffer, avoiding muscle and joint injuries.

[0027] 2. The energy storage mechanism of the present invention stores energy while buffering the pressure. When riding forward again, it can also release energy to provide a certain driving force for the bottom bracket, making it more labor-saving when riding forward.

[0028] 3. Through simple structural modifications, the present invention enables the bicycle to move forward regardless of whether the pedals are stepped on in the forward or reverse direction. It also has a buffering and boosting effect, has little impact on the bicycle structure, is easy to modify, and does not affect the rear-wheel speed change of the bicycle. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 FIG. is a diagram showing the usage state of the first embodiment of the present invention;

[0030] Figure 2 FIG. is a cross-sectional top view of the first embodiment of the present invention;

[0031] Figure 3 is Figure 2 an enlarged view of part A of;

[0032] Figure 4 FIG. is a cross-sectional right view of the second embodiment of the present invention;

[0033] Figure 5 FIG. is a structural schematic diagram (partially sectional) of the second embodiment of the present invention;

[0034] Figure 6 FIG. is a cross-sectional top view of the third embodiment of the present invention;

[0035] Figure 7 FIG. is a diagram showing the usage state of the third embodiment of the present invention.

[0036] In the figures: 1, frame; 2, bottom bracket; 3, freewheel; 4, bottom bracket spindle; 5, crank; 6, pedal; 7, chainring; 8, chain; 9, one-way drive gear; 10, energy storage mechanism; 11, coil spring; 12, housing; 13, first one-way bearing; 14, plain bearing; 15, driving tooth; 16, transmission shaft; 17, second one-way bearing; 18, third one-way bearing; 19, external meshing gear; 20, sprocket; 21, pressure wheel; 22, sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principle of the present invention and are not intended to limit the protection scope of the present invention.

[0038] Embodiment 1:

[0039] Referring to Figure 1 、 Figure 2 and Figure 3 , Figure 1 shows the usage state diagram of the first embodiment of the present invention, Figure 2 shows the cross-sectional top view of the first embodiment of the present invention.

[0040] Embodiment 1 of the present invention discloses a bicycle drive device, including a frame 1. At the right end of the rear lower fork of the frame 1, there is a bottom bracket 2. The left end of the rear lower fork is connected to the bicycle rear wheel, and the bicycle rear wheel is driven unidirectionally by a freewheel 3. A bottom bracket spindle 4 is inserted into the bottom bracket 2, and the bottom bracket spindle 4 can rotate in both forward and reverse directions within the bottom bracket 2. Both ends of the bottom bracket spindle 4 are connected to pedals 6 via cranks 5. A chainring 7 is fixedly connected to the bottom bracket spindle 4 extending out of the front end of the bottom bracket 2. The chainring 7 and the freewheel 3 are connected by an annular chain 8 to achieve power transmission. There is also a one-way drive gear 9 provided on the front side of the freewheel 3. The one-way drive gear 9 and the freewheel 3 are coaxial and rotate in the same direction, and both the one-way drive gear 9 and the freewheel 3 are connected to the frame 1 to drive the bicycle rear wheel to rotate clockwise. The outer rings of the freewheel 3 and the one-way drive gear 9 can rotate counterclockwise idly.

[0041] There is also an energy storage mechanism 10 provided on the front side of the chainring 7. The energy storage mechanism 10 includes a torsion spring 11 and a housing 12. The housing 12 is a disc-shaped shell, and the housing 12 wraps around the torsion spring 11. There are drive teeth 15 for power transmission provided on the outside of the housing 12. The drive teeth 15 are evenly arranged along the circumference of the front side of the housing 12 to form a bevel gear disc. A transmission shaft 16 is rotatably connected to the rear lower fork. Both ends of the transmission shaft 16 are provided with bevel gears. The bevel gear at one end of the transmission shaft 16 meshes with the left part of the bevel gear disc, and the bevel gear at the other end of the transmission shaft 16 meshes with the right part of the one-way drive gear 9. The transmission shaft 16 and the one-way drive gear 9 form a reverse transmission mechanism. The transmission shaft 16 can convert the driving force of the reverse rotation of the housing 12 into the driving force of forward rotation. When the housing 12 rotates in reverse, through the transmission of the transmission shaft 16, the one-way drive gear 9 rotates forward, which can drive the bicycle wheel to rotate forward, so that the bicycle travels forward. When pedaling the pedals forward, the one-way drive gear 9 rotates idly and does not interfere with pedaling the pedals in reverse;

[0042] The housing 12 is connected to the bottom bracket spindle 4 via a plain bearing 14. One end of the torsion spring 11 is connected to the bottom bracket spindle 4 via a first one-way bearing 13, and the other end is connected to the inner circumferential wall of the housing 12. The plain bearing 14 is one of the commonly used two-way rotating bearings such as a deep groove ball bearing, a tapered roller bearing, a cylindrical roller bearing, a needle bearing, etc. The first one-way bearing 13 and the plain bearing 14 form a one-way drive bearing group, so that the energy storage mechanism 10 is rotatably connected to the bottom bracket spindle 4. The first one-way bearing 13 allows the inner ring to rotate freely relative to the outer ring clockwise, that is, when pedaling the pedals 6 forward, the first one-way bearing 13 is in a free state. When the inner ring of the first one-way bearing 13 rotates with the bottom bracket spindle 4, the outer ring can rotate forward or not rotate, so that the bottom bracket spindle and the energy storage mechanism do not form a driving connection and do not affect forward riding. When pedaling the pedals 6 in reverse, the torsion spring 11 rotates in reverse with the bottom bracket spindle 4, so that the torsion spring 11 is tightened for energy storage. After storing energy to a certain extent, it drives the transmission shaft 16 to rotate, so that the bicycle travels forward.

[0043] In this embodiment, the above structure enables the energy storage mechanism 10 not to affect the rotation of the central shaft 4 when the pedal 6 is stepped on forward, but to store energy when stepped on backward and drive the rear wheel to rotate forward. It is mainly used to buffer when the pedal 6 is stepped on backward. That is, when the pedal 6 is stepped on backward, since the energy storage mechanism 10 has not stored energy yet, the pressure feedback is small, and the pedal 6 can be easily stepped on and rotated. Because the muscle force application parts and angles are different for forward and backward stepping on the pedal, a relatively light stepping force within a certain period of time can effectively discharge lactic acid in the muscles, relieve fatigue, and can also quickly adjust the muscle force application angle to adapt to the new riding mode. The coil spring 11 can store a certain amount of energy when the central shaft 4 rotates, and gradually increase the stepping force according to the energy storage situation of the coil spring 11, avoiding applying a large force at the beginning and causing muscle or joint injuries; after the reverse riding ends and turns to forward riding, it can also assist in forward riding and reduce the force output of forward riding, which also helps to relieve fatigue and adjust muscle force application.

[0044] Because the energy storage mechanism 10 is only connected to the central shaft 4, when the pedal 6 is stepped on forward, the central shaft 4 rotates forward, and the energy stored in the coil spring 11 will be quickly released.

[0045] Embodiment Two:

[0046] Figure 4 The right sectional view of Embodiment Two of the present invention is shown. Figure 5 The structural schematic diagram (partially sectional) of Embodiment Two of the present invention is shown.

[0047] Embodiment Two of the present invention discloses a bicycle driving device, including a frame 1. A bottom bracket 2 is provided at the right end of the rear lower fork of the frame 1, and the left end of the rear lower fork is connected to the bicycle rear wheel. The bicycle rear wheel is driven unidirectionally by a freewheel 3. A central shaft 4 is inserted into the bottom bracket 2, and the central shaft 4 can rotate in both forward and reverse directions within the bottom bracket 2. Both ends of the central shaft 4 are connected to pedals 6 via cranks 5. A chainring 7 is fixedly connected to the central shaft 4 extending out of the front end of the bottom bracket 2. The chainring 7 and the freewheel 3 are connected by an annular chain 8 to achieve power transmission. A unidirectional driving gear 9 is also provided on the front side of the freewheel 3. The unidirectional driving gear 9 and the freewheel 3 are coaxial and in the same direction, and both the unidirectional driving gear 9 and the freewheel 3 are connected to the frame 1 to drive the bicycle rear wheel to rotate clockwise. The outer rings of the freewheel 3 and the unidirectional driving gear 9 can rotate counterclockwise idly.

[0048] A energy storage mechanism 10 is also provided at the rear side of the chainring 7. The energy storage mechanism 10 includes a winding spring 11 and a housing 12. The housing 12 wraps around the winding spring 11. The housing 12 is connected to the bottom bracket spindle 4 through a common bearing 14 such as a deep groove ball bearing or a cylindrical roller bearing. The inner end of the winding spring 11 is connected to the outer rings of two one-way bearings through a sleeve 22. The two one-way bearings are a first one-way bearing 13 and a second one-way bearing 17 respectively. The outer diameters of the outer rings of the first one-way bearing 13 and the second one-way bearing 17 are the same, and the inner diameter of the inner ring of the first one-way bearing 13 is smaller than the inner diameter of the inner ring of the second one-way bearing 17. The inner ring of the first one-way bearing 13 is connected to the bottom bracket spindle 4, and the inner ring of the second one-way bearing 17 is connected to the bottom bracket shell 2. The outer end of the winding spring 11 is connected to the inner circumferential wall of the housing 12. The common bearing 14, the first one-way bearing 13 and the second one-way bearing 17 together form a one-way drive bearing group, so that the energy storage mechanism 10 is rotatably connected to the bottom bracket spindle 4; the driving directions of the first one-way bearing 13 and the second one-way bearing 17 are the same, and both allow the inner ring to rotate forward relative to the outer ring. When the pedal 6 is stepped on forward, the inner ring of the first one-way bearing 13 rotates along with the bottom bracket spindle 4, while the outer ring does not move, which does not affect forward riding. When the pedal 6 is stepped on backward, the first one-way bearing 13 is in a locked state, and the inner end of the winding spring 11 rotates along with the bottom bracket spindle 4, so that the winding spring 11 is tightened to store energy; a transmission tooth 15 for transmission is provided outside the housing 12. The transmission teeth 15 are arranged in a circumferential array on the front side surface of the housing 12 to form a bevel gear disk. A transmission shaft 16 is rotatably connected to the rear lower fork. Conical gears are provided at both ends of the transmission shaft 16. The conical gear at one end of the transmission shaft 16 meshes with the left part of the bevel gear disk, and the conical gear at the other end meshes with the right part of the one-way drive gear 9.

[0049] In this embodiment, the energy storage mechanism 10 absorbs energy. When the energy is stored to a certain extent, it drives the freewheel of the bicycle to rotate forward through chain drive or shaft drive, so that the bicycle moves forward; when the pedal 6 is stepped on forward, the energy can also form a forward assist, making forward riding more labor-saving. Due to the limitation of the two one-way bearings, the inner end of the winding spring 11 is relatively fixed to the bottom bracket shell 2 and does not rotate with the bottom bracket spindle. All the remaining energy is used for forward riding assistance, avoiding energy loss.

[0050] Embodiment Three:

[0051] Such as Figure 6 And Figure 7As shown in the figure, Embodiment 3 of the present invention discloses a bicycle drive device, including a frame 1. At the right end of the rear lower fork of the frame 1, there is a bottom bracket 2. The left end of the rear lower fork is connected to the bicycle rear wheel. The bicycle rear wheel is driven unidirectionally by a flywheel 3. A bottom bracket spindle 4 is inserted into the bottom bracket 2. The bottom bracket spindle 4 can rotate in both forward and reverse directions within the bottom bracket 2. Both ends of the bottom bracket spindle 4 are connected to pedals 6 via cranks 5. The bottom bracket spindle 4 extending out of the front end of the bottom bracket 2 is connected to a chainring 7 via a third one-way bearing 18. The third one-way bearing 18 drives the chainring 7 to rotate forward when the pedals 6 are pedaled forward, and does not directly drive the chainring 7 to rotate when the pedals 6 are pedaled backward. The chainring 7 and the flywheel 3 are connected by an annular chain 8 to achieve power transmission.

[0052] There is also an energy storage mechanism 10 provided at the rear side of the chainring 7. The energy storage mechanism 10 includes a torsion spring 11 and a housing 12. The housing 12 wraps around the torsion spring 11. The housing 12 is connected to the bottom bracket spindle 4 via a common bearing 14 such as a deep groove ball bearing or a cylindrical roller bearing. The inner end of the torsion spring 11 is connected to the outer rings of two one-way bearings via a sleeve 22. The two one-way bearings are a first one-way bearing 13 and a second one-way bearing 17 respectively. The outer diameters of the outer rings of the first one-way bearing 13 and the second one-way bearing 17 are the same. The inner diameter of the inner ring of the first one-way bearing 13 is smaller than the inner diameter of the inner ring of the second one-way bearing 17. Among them, the inner ring of the first one-way bearing 13 is connected to the bottom bracket spindle 4, and the inner ring of the second one-way bearing 17 is connected to the bottom bracket 2. The outer end of the torsion spring 11 is connected to the inner circumferential wall of the housing 12, so that the energy storage mechanism 10 is rotatably connected to the bottom bracket spindle 4; the first one-way bearing 13 and the second one-way bearing 17 have the same transmission direction and both allow the inner ring to rotate forward relative to the outer ring, that is, the first one-way bearing 13 and the second one-way bearing 17 are both opposite to the third one-way bearing 18 in direction. When the pedals 6 are pedaled forward, the inner ring of the first one-way bearing 13 rotates with the bottom bracket spindle 4 while the outer ring remains stationary, which does not affect forward riding. When the pedals 6 are pedaled backward, the first one-way bearing 13 is in a locked state, and the inner end of the torsion spring 11 rotates with the bottom bracket spindle 4, so that the torsion spring 11 is tightened for energy storage; a transmission tooth 15 for power transmission is provided on the outer circumferential wall of the housing 12. The transmission tooth 15 is a straight tooth. A spur gear is rotatably connected to the rear lower fork. This spur gear serves as an external meshing gear 19 of the housing 12. A sprocket 20 is coaxially and fixedly connected to the front side of the spur gear. The external meshing gear 19 and the sprocket 20 constitute the reverse transmission mechanism of this embodiment. The teeth of the sprocket 20 extend into the chain 8. When the sprocket 20 rotates, it drives the chain 8 to rotate. On the other side of the chain 8, there is a pressure wheel 21 that presses the chain 8 against the sprocket 20. The pressure wheel 21 is rotatably connected to the rear lower fork. For the convenience of installation and adjustment, a height adjustment device is provided between the pressure wheel 21 and the rear lower fork, so that the pressure wheel can be adjusted up and down and can be positioned.

[0053] To avoid the problem of jamming, in this embodiment, the rotational linear velocity of the teeth on the sprocket 20 is less than or equal to the rotational linear velocity of the teeth on the chainring 7. This function can be achieved in various forms. For example, the pitch diameter of the driving gear 15 on the housing is less than the pitch diameter of the chainring 7, and the pitch diameter of the sprocket 20 is equal to the pitch diameter of the external meshing gear 19; or the pitch diameter of the driving gear 15 on the housing is equal to the pitch diameter of the chainring 7, and the pitch diameter of the sprocket 20 is less than the pitch diameter of the external meshing gear 19, as long as (R 传动齿 / R 外啮合齿轮 )×(R 链轮 / R 牙盘 )≤1 is satisfied, where R 传动齿 、R 外啮合齿轮 、R 牙盘 and R 链轮 are respectively the pitch diameter of the tooth circle formed by the driving gear 15, the pitch diameter of the external meshing gear, the pitch diameter of the chainring, and the pitch diameter of the sprocket.

[0054] In this embodiment, the external meshing gear 19 and the sprocket 20 are used as the reverse transmission mechanism to switch the driving force for the reverse rotation of the housing 12 to the driving force for the forward rotation, and the bicycle is driven to travel forward through the chain 8.

[0055] It should be noted that in the description of the present invention, the terms indicating directions or positional relationships such as "center, up, down, left, right, vertical, horizontal, inner, outer" are based on the directions or positional relationships shown in the drawings. This is only for convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention. In addition, the terms "first, second, third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. "Forward" and "reverse" respectively refer to the pedaling rotation direction the same as that of normal bicycle riding and the pedaling rotation direction opposite to that of normal bicycle riding. In the embodiments and drawings of the present invention, the bicycle traveling to the right is forward, and the pedal rotating clockwise is forward.

[0056] In addition, it should also be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "mounted, connected, connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0057] The term "comprising" or any other similar term is intended to cover non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to those processes, articles, or apparatus / devices.

[0058] So far, the technical solution of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easily understood by those skilled in the art that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. A bicycle driving device, comprising a frame (1), wherein a five-way bracket (2) and a flywheel (3) are provided on the frame (1), wherein a middle shaft (4) is inserted into the five-way bracket (2), and wherein any end of the middle shaft (4) extending out of the five-way bracket (2) is connected to a toothed disc (7), wherein the toothed disc (7) and the flywheel (3) are driven by a chain (8), wherein: An energy storage mechanism (10) is provided on one side of the toothed disc (7); The energy storage mechanism (10) is rotatably connected to the middle shaft (4) via a one-way drive bearing group. When the middle shaft (4) rotates in the forward direction, the energy storage mechanism (10) does not rotate or rotates in the forward direction along with the middle shaft (4). When the middle shaft (4) rotates in the reverse direction, the energy storage mechanism (10) rotates in the reverse direction and performs buffering and energy storage. When the energy storage mechanism (10) stores a certain amount of energy, the reverse transmission mechanism drives the bicycle to travel in the forward direction.

2. The bicycle driving device according to claim 1, characterized in that: The energy storage mechanism (10) comprises a coil spring (11) and a housing (12), wherein the housing (12) is sleeved on the outside of the coil spring (11), the inner wall of the housing (12) is connected to the outer end of the coil spring (11), and transmission teeth (15) for transmission are arranged outside the housing (12).

3. The bicycle driving device according to claim 2, characterized in that: The one-way drive bearing group comprises a first one-way bearing (13) and a common bearing (14), wherein the first one-way bearing (13) allows the inner ring to rotate positively relative to the outer ring; the inner end of the coil spring (11) is connected to the central shaft (4) via the first one-way bearing (13), and the outer shell (12) is connected to the central shaft (4) via the common bearing (14).

4. The bicycle driving device according to claim 3, characterized in that: The one-way drive bearing group also includes a second one-way bearing (17), the second one-way bearing (17) has the same direction as the first one-way bearing (13), the inner ring of the second one-way bearing (17) is connected to the five-way joint (2), and the outer ring of the second one-way bearing (17) is connected to the inner end of the coil spring (11).

5. The bicycle driving device according to claim 4, characterized in that: The outer rings of the first one-way bearing (13) and the second one-way bearing (17) are connected to a sleeve, and the sleeve is connected to the inner end of the coil spring (11).

6. The bicycle driving device according to claim 5, characterized in that: The reverse transmission mechanism comprises a one-way driving gear (9) and a transmission shaft (16) with bevel gears at both ends. The one-way driving gear (9) is coaxial and codirectional with a flywheel (3) and is used to drive the rear wheel of the bicycle to travel in the forward direction. The bevel gear at one end of the transmission shaft (16) meshes with the one-way driving gear (9), and the other end meshes with a transmission tooth (15) on a housing (12).

7. The bicycle driving device according to any one of claims 3 to 5, characterized in that: The crankset (7) is connected to the central shaft (4) via a third one-way bearing (18), and the third one-way bearing (18) is in the opposite direction to the first one-way bearing (13) and the second one-way bearing (17).

8. The bicycle driving device according to claim 7, characterized in that: The reverse transmission mechanism comprises an external meshing gear (19) and a sprocket (20), wherein the external meshing gear (19) meshes with the transmission teeth (15) on the housing (12), the external meshing gear (19) is coaxially connected to the sprocket (20), and the sprocket (20) is drivingly connected to the chain (8).

9. The bicycle driving device according to claim 8, characterized in that: A pressure wheel (21) corresponding to the sprocket wheel (20) is provided on the other side of the chain (8).

10. The bicycle driving device according to claim 9, characterized in that: The pressure wheel (21), the external gear (19) and the sprocket (20) are all connected to the vehicle frame (1).

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