Belt, chain wheel, flywheel and transmission system

Abstract

The utility model relates to a belt, a chain wheel, a flywheel and a transmission system, and belongs to the technical field of bicycle accessories. The belt comprises a belt body and protrusions, the protrusions are arranged on the inner circumferential face of the belt body, the lengths of the protrusions extend from the first side face of the belt body to the second side face of the belt body, the protrusions are distributed on the inner circumferential face of the belt body in the circumferential direction at intervals, and protruding parts are arranged on the protrusions. The protruding part extends from the surface of the protrusion to the direction away from the peripheral face of the belt body, the width direction of the belt body is from the first side face to the second side face, and the length of the protruding part is smaller than that of the protrusion in the width direction of the belt body. The transmission system comprises a belt, a chain wheel, a flywheel and a supporting mechanism, the chain wheel and the flywheel are both connected to the supporting mechanism, and the belt is wound around the peripheries of the chain wheel and the flywheel so that the chain wheel can drive the flywheel to rotate through the belt. The bicycle transmission system has the effect that the problem that friction abnormal sound is generated due to the fact that a bicycle transmission system belt is prone to deviation is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bicycle accessories, in particular to a belt, a sprocket, a freewheel and a transmission system. BACKGROUND

[0002] The sprocket and the freewheel are main components of the bicycle transmission system, and can transmit power to the rider through the belt as a power transmission medium, converting the rider's pedaling force into the rotational power of the wheel. With the popularity of cycling and the advancement of technology, people have increasingly high requirements for the performance of bicycles, especially for the stability and durability of the transmission system.

[0003] At present, in the common bicycle transmission system, the belt is usually tightly fitted to contact the sprocket and the freewheel. Specifically, the commonly used methods include but are not limited to the following: one is to use a smooth belt surface to directly contact the outer circumferential surface of the sprocket and the freewheel; the other is to adjust the tensioning device to ensure that the pressure between the belt and the sprocket and the freewheel is large enough to ensure good friction.

[0004] However, the above methods are prone to belt deviation and wear after long-term use, which not only affects the transmission efficiency, but also causes noise increase, service life shortening, and even may cause safety accidents.

[0005] In the above related technology, the belt of the bicycle transmission system is prone to deviation and generates friction noise. CONTENT OF THE INVENTION

[0006] In order to improve the problem that the belt of the bicycle transmission system is prone to deviation and generates friction noise, the present application provides a belt, a sprocket, a freewheel and a transmission system.

[0007] In the first aspect, the belt provided by the present application adopts the following technical solution:

[0008] A belt comprises: a belt body provided with an inner circumferential surface, an outer circumferential surface, a first side surface and a second side surface, the outer circumferential surface of the belt body is parallel to the inner circumferential surface of the belt body, the first side surface and the second side surface are oppositely arranged, the first side surface and the second side surface are arranged on both sides of the inner circumferential surface, and the inner circumferential surface is used as a transmission surface; a protrusion provided on the inner circumferential surface of the belt body, the length of the protrusion extends from the first side surface to the second side surface, a plurality of protrusions are provided, the plurality of protrusions are distributed on the inner circumferential surface of the belt in a circumferential direction, the protrusion at least comprises a first part and a second part, a first end of the first part is connected to the inner circumferential surface of the belt body, a second end of the first part extends away from the outer circumferential surface of the belt body, a first end of the second part is connected to the second end of the first part, a second end of the second part is connected to the inner circumferential surface of the belt body, and the second end of the second part is arranged in a spaced manner with the first end of the first part, so that the protrusion protrudes from the inner circumferential surface of the belt body to the direction away from the outer circumferential surface of the belt body, a protruding part is provided on the protrusion, the protruding part extends from the surface of the protrusion to the direction away from the outer circumferential surface of the belt body, the length of the protruding part is less than the length of the protrusion in the width direction of the belt body from the first side surface to the second side surface.

[0009] By adopting the above technical scheme, the design of the protrusion can increase the roughness of the transmission surface of the belt body during use, effectively limit the slip of the belt in the circumferential direction, and achieve more stable transmission effect; the structure of the protrusion can be arranged separately on the one hand, improving the applicability, and on the other hand, the protrusion near the bottom of the belt body has a certain width, improving the limiting reliability of the protrusion; at the same time, the protruding part further enhances the anti-skid performance, not only enhances the circumferential limiting and anti-skid effect, but also significantly reduces the risk of deviation in the width direction of the belt body due to the length of the protruding part being less than the length of the protrusion, reduces the power loss caused by insufficient friction, and reduces the friction noise problem caused by deviation and slip of the belt.

[0010] Optionally, the protrusion comprises a third part, both ends of the third part are connected to the second end of the first part and the first end of the second part respectively, the first part and the second part are arranged on both sides of the third part in the circumferential direction of the belt body, and the structures of the first part and the second part are the same or different.

[0011] By adopting the technical scheme, the protrusion structure is more stable and reliable. Specifically, the third part is arranged to form a stable whole, improve the stability of the belt body during use, and reduce the matching difficulty of the protrusion. The first part and the second part are arranged on both sides of the third part along the circumferential direction of the belt body, which enhances the strength and durability of the protrusion and reduces the damage risk caused by uneven stress.

[0012] Optionally, the protrusion has a triangular, circular or square cross section.

[0013] In a second aspect, the application provides a tooth disc, which adopts the following technical scheme:

[0014] A tooth disc is used in cooperation with the belt, and the tooth disc comprises a tooth disc body, a first groove, and a first recess.

[0015] By adopting the technical scheme, the first groove is closely matched with the protrusion on the belt body, which can effectively prevent the belt from slipping during operation, thereby reducing the wear of the belt and improving the stability and service life of the transmission between the tooth disc and the belt. The first groove is provided with a first recess, which can be accurately matched with the protrusion on the belt. This not only improves the positioning accuracy between the belt and the tooth disc, but also reduces the risk of deviation and wear of the belt along the circumferential and width directions.

[0016] Optionally, the first guide is arranged on both ends of the first groove along the thickness direction of the tooth disc body, and the first guide is arranged on one side of the first recess to enable the protrusion to enter the first groove. The first guide is arranged in a spaced manner with the groove bottom of the first groove.

[0017] By adopting the technical scheme, the first guide piece can limit the protrusion in the width direction, thereby reducing the risk of deviation. In addition, the first guide piece is inclined to one side of the first recess, so that the protrusion can more easily enter the first groove, thereby improving the engagement efficiency and reliability between the belt and the tooth disc. Meanwhile, the first guide piece is spaced from the groove bottom of the first groove, which can effectively reduce the problem of air pressure increase in the closed space during engagement, thereby reducing the resistance of the belt entering the first groove, ensuring smooth cooperation between the belt and the tooth disc, and improving the reliability and stability of transmission.

[0018] In a third aspect, the flywheel provided by the application adopts the following technical scheme:

[0019] A flywheel for cooperating with the belt described above, the flywheel comprising: a flywheel body; a second groove, the length of the second groove extending in the thickness direction of the flywheel body, a plurality of second grooves being distributed on the outer circumferential surface of the flywheel body in a circumferential direction, the second groove being used for cooperating with the protrusion to drive the flywheel body to rotate, the second groove being provided with a second recess, the second recess extending from the bottom of the second groove to the inner circumferential surface of the flywheel body, and the second recess being used for cooperating with the protruding portion.

[0020] By adopting the above technical scheme, the second groove on the flywheel closely cooperates with the protrusion of the belt, thereby reducing the risk of deviation caused by slipping during transmission, improving the stability and reliability of the belt and the flywheel transmission. Meanwhile, this design also reduces the slipping wear between the belt and the flywheel, prolonging the service life; the second groove is provided with a second recess and cooperates with the corresponding protruding portion on the belt, which makes the belt more stable during operation, effectively preventing the derailment phenomenon caused by the transverse displacement of the belt along the width direction, thereby improving the reliability of the transmission. Meanwhile, this design can also reduce the friction caused by slipping between the belt and the flywheel, further reducing wear and prolonging the service life of the components.

[0021] Optionally, along the thickness direction of the flywheel body, both ends of the second groove are provided with a second guide piece, the second guide piece is inclined to one side of the second recess, so that the protrusion can enter the second groove, and the second guide piece is spaced from the groove bottom of the second groove.

[0022] By adopting the technical scheme, the design of the second guide piece can limit the protrusion in the width direction, reducing the risk of deviation; and the inclined arrangement of the second guide piece enables the protrusion on the belt to smoothly enter the second groove of the flywheel, thereby ensuring the stable engagement between the belt and the flywheel; meanwhile, the interval arrangement between the second guide piece and the bottom of the second groove can effectively reduce the problem of air pressure increase in the closed space during engagement, thereby reducing the resistance of the belt when entering the second groove, ensuring the smooth cooperation between the belt and the flywheel, and improving the reliability and stability of transmission.

[0023] In a fourth aspect, the transmission system provided by the present application adopts the following technical scheme:

[0024] A transmission system comprises the belt, the disc wheel and the flywheel, and further comprises a supporting mechanism, the disc wheel and the flywheel are connected to the supporting mechanism, and the belt is arranged around the outer periphery of the disc wheel and the flywheel, so that the disc wheel can drive the flywheel to rotate through the belt.

[0025] By adopting the technical scheme, the transmission system can realize the precise engagement between the disc wheel, the flywheel and the belt, so as to reduce the deviation, slipping and wear of the belt during long-time use. Specifically, the multi-stage protrusion structure arranged on the belt and the corresponding groove design on the disc wheel and the flywheel not only improve the transmission efficiency, but also enhance the stability and reliability of the system. In addition, the design of the first guide piece and the second guide piece makes the belt more easily and accurately enter the corresponding groove, further reduces the risk of deviation, and prolongs the service life.

[0026] In summary, the present application has at least one of the following beneficial technical effects:

[0027] 1. By arranging a plurality of protrusions on the inner periphery of the belt and making them closely cooperate with the first groove of the disc wheel and the second groove on the flywheel, the slipping phenomenon of the belt along the circumferential direction during transmission is effectively reduced, and the stability of transmission is improved;

[0028] 2. The protrusions are provided with protruding parts, which cooperate with the first recess on the disc wheel and the second recess on the flywheel, respectively, so as to reduce the risk of transverse deviation of the belt along the width direction during transmission, further improve the stability of transmission, and reduce the generation of wear and noise;

[0029] 3. The first guide piece on the disc wheel and the second guide piece on the flywheel can provide a guiding effect for the cooperation with the protrusions, and reduce the problem of air pressure increase in the closed space during the engagement of the belt, thereby reducing the resistance of the belt when entering the first groove and the second groove, ensuring the smooth cooperation between the belt and the disc wheel and the flywheel, and improving the reliability and stability of transmission. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a schematic view of a belt of an embodiment of the present application.

[0031] Figure 2 is a schematic view of a toothed disc of an embodiment of the present application.

[0032] Figure 3 is a schematic view of a first guide of an embodiment of the present application.

[0033] Figure 4 is a schematic view of a flywheel of an embodiment of the present application.

[0034] BRIEF DESCRIPTION OF DRAWINGS

[0035] 11, belt body; 12, protrusion; 121, protruding portion; 21, toothed disc body; 22, first groove; 221, first recessed portion; 23, first guide; 31, flywheel body; 32, second groove; 321, second recessed portion; 33, second guide. DETAILED DESCRIPTION

[0036] The following description will be made in connection with the drawings that are included to provide a better understanding of the application. The Figure 1 - The accompanying drawings Figure 4 The present application will be described in further detail. In the present embodiment, unless explicitly specified and limited, "connection", "connection" and "fixing" are understood in a broad sense, including fixed connection, detachable connection, connection forming an integral structure, mechanical connection, electrical connection, direct connection, indirect connection through intermediaries, internal connection and interaction between two elements, which can be understood according to the specific circumstances.

[0037] In the present application, unless explicitly specified and limited, the first feature "on" or "under" the second feature can include direct contact between the first and second features, or indirect contact between the first and second features through another feature therebetween. Moreover, in the description of the present embodiment, the terms "up", "down", "left", "right" and the like orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Unless stated to the contrary, the orientation words such as "inner" and "outer" used in the present application refer to the contour of the corresponding parts.

[0038] As Figure 1As shown, the embodiment of the present application discloses a belt, which comprises a belt body 11 and a protrusion 12. The belt body 11 is provided with an inner circumferential surface, an outer circumferential surface, a first side surface and a second side surface, wherein the inner circumferential surface and the outer circumferential surface are curved surfaces, and the first side surface and the second side surface are annular planes. The outer circumferential surface of the belt body 11 is parallel to the inner circumferential surface of the belt body 11, and the first side surface and the second side surface are oppositely arranged and are arranged on both sides of the inner circumferential surface, and the inner circumferential surface is used as a transmission surface.

[0039] As shown, Figure 1 The protrusion 12 is arranged on the inner circumferential surface of the belt body 11, and the length of the protrusion 12 extends from the first side surface to the second side surface. The protrusion 12 is arranged in a plurality of protrusions 12, and the plurality of protrusions 12 are circumferentially spaced apart on the inner circumferential surface of the belt. The design of the protrusion 12 can increase the roughness of the transmission surface of the belt body 11 during use, and can effectively limit the slip of the belt in the circumferential direction, and realize more stable transmission effect.

[0040] The protrusion 12 at least comprises a first part and a second part, the first end of the first part is connected to the inner circumferential surface of the belt body 11, the second end of the first part extends away from the outer circumferential surface of the belt body 11, the first end of the second part is connected to the second end of the first part, and the second end of the second part is connected to the inner circumferential surface of the belt body 11. The second end of the second part is arranged in a spaced manner with the first end of the first part, so that the protrusion 12 protrudes from the inner circumferential surface of the belt body 11 to the direction away from the outer circumferential surface of the belt body 11, that is, the protrusion 12 protrudes from the inner circumferential surface of the belt body 11. The structure of the protrusion 12, on the one hand, makes the structure of the first part and the second part can be arranged respectively, improves the applicability; on the other hand, the protrusion 12 close to the bottom of the belt body 11 has a certain width, which improves the limiting reliability of the protrusion 12.

[0041] As shown, Figure 1 The protrusion 12 is arranged on the inner circumferential surface of the belt body 11, and the length of the protrusion 12 extends from the first side surface to the second side surface. The protrusion 12 is arranged in a plurality of protrusions 12, and the plurality of protrusions 12 are circumferentially spaced apart on the inner circumferential surface of the belt. The design of the protrusion 12 can increase the roughness of the transmission surface of the belt body 11 during use, and can effectively limit the slip of the belt in the circumferential direction, and realize more stable transmission effect.

[0042] As shown, Figure 1As shown, the protrusion 12 optionally includes a third part, the two ends of the third part are connected to the second end of the first part and the first end of the second part respectively. Along the circumferential direction of the belt body 11, the first part and the second part are arranged on the two sides of the third part, so that the structure of the protrusion 12 is more stable and reliable, and the structures of the first part and the second part are the same or different. The third part is arranged to form a stable whole for the protrusion 12, thereby improving the stability of the belt body 11 during use. Along the circumferential direction of the belt body 11, the first part and the second part are arranged on the two sides of the third part, which enhances the strength and durability of the protrusion 12 and reduces the risk of damage caused by uneven stress. The first part and the second part can be designed to have the same structure or different structures, which provides greater flexibility for actual application and can be optimized according to specific working conditions, thereby improving the transmission performance and reliability.

[0043] The first part, the second part and the third part can all be flat or curved, and the design of the first part and the second part can ensure the stability of the protrusion 12 on the inner circumferential surface of the belt, thereby reducing looseness caused by vibration or impact. The presence of the third part further enhances the overall strength and stability of the protrusion 12, thereby preventing deformation during high-speed operation. The parts can be selected to have different shapes to meet the needs of different working conditions and improve the applicability and reliability of the transmission system. For example, in the embodiment, the first part and the second part are both inclined flat surfaces, so that the cross-sectional area of the protrusion 12 connecting the bottom of the belt body 11 is larger than the cross-sectional area of the top of the protrusion 12, so as to facilitate the driving of the belt by the abutment of the first part and the second part with other structures; the third part is a curved surface to reduce the risk of interference and damage to other structures, and also to reduce the difficulty of matching the protrusion 12; the first part and the second part can be symmetrically arranged on the two sides of the third part, or the inclination angles of the first part and the second part can be set to be different according to actual needs to optimize the transmission effect.

[0044] As shown in Figure 1 , Figure 2 and Figure 3 , the application also discloses a tooth disc. The tooth disc includes a tooth disc body 21 and a first groove 22 for cooperating with the belt described above.

[0045] The first groove 22 is provided with a plurality of first recesses 221, the depth of the first recess 221 extends from the bottom of the first groove 22 to the direction close to the inner circumferential surface of the disc body 21, and the first recess 221 is used for cooperating with the protruding part 121. The first recess 221 can be accurately matched with the protruding part 121 on the belt, which not only improves the positioning accuracy between the belt and the disc, but also reduces the risk of deviation and wear of the belt in the circumferential and width directions.

[0046] As shown in Figure 1 , Figure 2 and Figure 3 , the first groove 22 is provided with a first recess 221, the depth of the first recess 221 extends from the bottom of the first groove 22 to the direction close to the inner circumferential surface of the disc body 21, and the first recess 221 is used for cooperating with the protruding part 121. The first recess 221 can be accurately matched with the protruding part 121 on the belt, which not only improves the positioning accuracy between the belt and the disc, but also reduces the risk of deviation and wear of the belt in the circumferential and width directions.

[0047] As shown in Figure 1 , Figure 2 and Figure 3 , optionally, along the thickness direction of the disc body 21, both ends of the first groove 22 are provided with a first guide 23. The first guide 23 is inclined to the side of the first recess 221, so that the protrusion 12 can enter the first groove 22. The first guide 23 can limit the protrusion 12 in the width direction on the one hand, and reduce the risk of deviation, on the other hand, the design of the first guide 23 inclined to the side of the first recess 221 makes the protrusion 12 more easily enter the first groove 22, improves the engagement efficiency and reliability between the belt and the disc. At the same time, the first guide 23 is spaced apart from the groove bottom of the first groove 22, which can effectively reduce the problem of increasing air pressure in the closed space during engagement, thereby reducing the resistance when the belt enters the first groove 22, ensuring that the belt can be smoothly matched with the disc, and improving the reliability and stability of transmission.

[0048] As shown in Figure 1 and Figure 4 , the application also discloses a flywheel. The flywheel comprises a flywheel body 31 and a second groove 32, which is used for cooperating with the above-mentioned belt.

[0049] As shown in Figure 1 and Figure 4As shown, the flywheel body 31 is used to carry the belt body 11. The length of the second groove 32 extends along the thickness direction of the flywheel body 31, and the second groove 32 is recessed in the outer surface of the flywheel body 31. The second groove 32 is provided with a plurality of second grooves 32 which are circumferentially spaced apart on the outer circumferential surface of the flywheel body 31. The second groove 32 is used to cooperate with the protrusion 12 to drive the flywheel body 31 to rotate by the rotation of the belt body 11. The second groove 32 on the flywheel closely cooperates with the protrusion 12 of the belt, which reduces the risk of deviation caused by slipping during transmission of the belt, and improves the stability and reliability of the transmission of the belt and the flywheel. At the same time, this design also reduces the slipping wear between the belt and the flywheel, prolonging the service life.

[0050] The second groove 32 is provided with a second recess 321, the depth of the second recess 321 extends from the bottom of the second groove 32 to the direction close to the inner circumferential surface of the flywheel body 31, and the second recess 321 is used to cooperate with the protruding portion 121. The second groove 32 is provided with the second recess 321 and cooperates with the corresponding protruding portion 121 on the belt, which makes the belt more stable during operation, effectively prevents the derailment phenomenon caused by the transverse displacement of the belt along the width direction, and improves the reliability of the transmission. At the same time, this design can also reduce the friction between the belt and the flywheel caused by slipping, further reduce wear, and prolong the service life of the components.

[0051] As shown in Figure 1 and Figure 4 , optionally, along the thickness direction of the flywheel body 31, both ends of the second groove 32 are provided with a second guide 33. The second guide 33 is inclined to one side of the second recess 321, so that the protrusion 12 can enter the second groove 32. The design of the second guide 33 can limit the protrusion 12 in the width direction, reducing the risk of deviation; and the inclined arrangement of the second guide 33 makes the protrusion 12 on the belt smoothly enter the second groove 32 of the flywheel, thereby ensuring the stable engagement between the belt and the flywheel. At the same time, the second guide 33 is spaced apart from the groove bottom of the second groove 32, which can effectively reduce the problem of increasing air pressure in the closed space during engagement, thereby reducing the resistance when the belt enters the second groove 32, ensuring smooth cooperation between the belt and the flywheel, and improving the reliability and stability of the transmission. In this embodiment, the second guide 33 is similar in structure to the first guide 23, and the specific size parameters are set as needed.

[0052] As shown in Figure 1 , Figure 2 and Figure 4As shown, the embodiment of the present application further discloses a transmission system. The transmission system comprises the belt, the gear disc and the flywheel described above, and further comprises a supporting mechanism, the specific structure of which is not limited. The gear disc and the flywheel are both rotationally connected to the supporting mechanism, and the belt is arranged around the outer periphery of the gear disc and the flywheel, so that the gear disc can drive the flywheel to rotate through the belt. The transmission system can realize the precise meshing between the gear disc, the flywheel and the belt, so as to reduce the deviation, skidding and wear of the belt during long-term use, and further reduce the friction noise. Specifically, the multi-stage protruding structure arranged on the belt and the corresponding groove design on the gear disc and the flywheel not only improve the transmission efficiency, but also enhance the stability and reliability of the system. In addition, the design of the first guide 23 and the second guide 33 makes the belt more easily and accurately enter the corresponding groove, further reduces the risk of deviation, and prolongs the service life.

[0053] It can be understood that the transmission system further comprises necessary structures for connection, support, driving, positioning, limiting and control, etc., so that the transmission system can normally operate; the shape, size, material and setting number of each part of the transmission system can be determined according to the needs, as long as the corresponding functions can be realized.

[0054] The implementation principle of the transmission system of the embodiment of the present application is that: by arranging a plurality of protrusions 12 on the inner circumferential surface of the belt and enabling them to closely cooperate with the first groove 22 of the gear disc and the second groove 32 on the flywheel, the circumferential skidding phenomenon of the belt during transmission is effectively reduced, the stability of transmission is improved, and wear is reduced; the protruding part 121 is further arranged on the protrusion 12 and can cooperate with the first recess 221 on the gear disc and the second recess 321 on the flywheel, so as to reduce the risk of transverse deviation of the belt in the width direction during belt transmission, further improve the stability of transmission, and reduce the generation of wear and noise; the first guide 23 on the gear disc and the second guide 33 on the flywheel can not only provide a guiding effect for cooperation with the protrusion 12, but also reduce the problem of increased air pressure caused by the formation of a closed space in the groove when the belt is engaged, thereby reducing the resistance when the belt enters the first groove 22 and the second groove 32, ensuring that the belt cooperates smoothly with the gear disc and the flywheel, and improving the reliability and stability of transmission.

[0055] The above are the preferred embodiments of the present application, which do not limit the protection scope of the present application, therefore: any equivalent changes made on the basis of the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A belt, characterized in that The toothed disc comprises: a toothed disc body (21); a first groove (22), the length of the first groove (22) extends along the thickness direction of the toothed disc body (21), the first groove (22) is provided with a plurality of, a plurality of the first grooves (22) are distributed on the outer circumferential surface of the toothed disc body (21) in the circumferential direction, the first groove (22) is used for cooperating with the protrusion (12), so that the rotation of the toothed disc body (21) can drive the rotation of the belt body (11), the first groove (22) is provided with a first recess (221), the first recess (221) extends from the bottom of the first groove (22) to the direction close to the inner circumferential surface of the toothed disc body (21), and the first recess (221) is used for cooperating with the protruding portion (121).

2. The belt of claim 1, wherein ​ 3. The belt of claim 2, wherein, ​ 4. A pan for cooperating with the belt according to any one of claims 1-3, characterized in that, ​ ​ ​ 5. The dental tray of claim 4, wherein, First guide pieces (23) are arranged at both ends of the first grooves (22) along the thickness direction of the toothed disc body (21), and the first guide pieces (23) are arranged obliquely towards one side of the first recesses (221) so that the protrusions (12) can enter the first grooves (22), and the first guide pieces (23) are arranged spaced apart from the groove bottoms of the first grooves (22).

6. A flywheel for cooperating with the belt of any one of claims 1-3, characterized in that, The flywheel comprises: a flywheel body (31); a plurality of second grooves (32) extending along the thickness direction of the flywheel body (31), the second grooves (32) being arranged circumferentially spaced apart on the outer circumferential surface of the flywheel body (31), the second grooves (32) being used for cooperating with the protrusions (12) so that the rotation of the belt body (11) can drive the flywheel body (31) to rotate, the second grooves (32) being provided with second recesses (321) extending from the bottoms of the second grooves (32) towards the inner circumferential surface of the flywheel body (31), the second recesses (321) being used for cooperating with the protrusions (121).

7. The flywheel of claim 6, wherein, Second guide pieces (33) are arranged at both ends of the second grooves (32) along the thickness direction of the flywheel body (31), and the second guide pieces (33) are arranged obliquely towards one side of the second recesses (321) so that the protrusions (12) can enter the second grooves (32), and the second guide pieces (33) are arranged spaced apart from the groove bottoms of the second grooves (32).

8. A transmission system characterised in that, The belt of claim 3, the toothed disc of claim 5 and the flywheel of claim 7 further comprise a supporting mechanism, the toothed disc and the flywheel being connected to the supporting mechanism, and the belt being arranged around the outer circumferences of the toothed disc and the flywheel so that the toothed disc can drive the flywheel to rotate through the belt.

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