Flexible transmission structure of bicycle

Abstract

Provided is a flexible transmission structure of a bicycle, comprising a stop block (2), a right crank (3), a compression spring (5), a force bearing rod (6), a chain disc (7), and a central shaft (8), wherein the chain disc (7) is sleeved on the central shaft (8) and can rotate on the central shaft (8); the force bearing rod (6) and the stop block (2) are fixed on the chain disc (7); the force bearing rod (6) is arranged on the front side of the right crank (3); the stop block (2) is arranged on the rear side of the right crank (3); a force bearing block A is fixed on the force bearing rod (6); the two ends of the compression spring (5) are sleeved on spring seats on the respective upper portions of the force bearing rod (6) and the right crank (3); the stop block (2) stops the right crank (3), so that the compression spring (5) has a pre-tightening force; when a right pedal (4) rotates to the vicinity of a top dead center, the right pedal (4) is pedaled so that the compression spring (5) is compressed; the right pedal (4) can be pedaled through the top dead center by using a small force, so that the right pedal (4) rapidly enters a section with large driving torque; the right crank (3) is in contact with the force bearing block A and then an increased force acts on the chain disc (7). On the basis of the same principle, a left pedal (10) can also be pedaled through the top dead center by using a small force. Thus, the problem that legs are easily tired in the process of riding a bicycle can be mitigated.

Description

Bicycle flexible transmission structure Technical Field

[0001] The present invention relates to the field of bicycles, represented by bicycles. Springs and connecting auxiliary parts are added between transmission parts of bicycles, such as bicycles, so that the transmission parts are elastically connected and the transmission system has a certain degree of flexibility. When riding a bicycle uphill or accelerating, when the pedals pass the top dead center, the springs added to the transmission system are stressed and activated, so that the pedals can be pushed past the top dead center with less force, making the bicycle riding easier. Background Art

[0002] At present, in the field of bicycle technology, most of the bicycles are driven by pedaling in circles. When the pedals rotate to near the top dead center, it is not easy to exert force to pedal forward, the driving torque is small, and the leg joints are greatly bent at this time, so it is easy to feel leg fatigue when riding uphill. The transmission structure of existing bicycles and other bicycles is not well matched with the pedaling drive method of people near the top dead center. Technical issues

[0003] The object of the present invention is to provide a flexible transmission structure for a bicycle. Springs and connecting auxiliary parts are added to the links of the bicycle crank and chain plate, chain and frame, flywheel and rear wheel, and pedals and cranks to achieve elastic connection between the transmission parts and give the transmission system a certain degree of flexibility. When riding a bicycle uphill or accelerating and pedaling past the top dead center, the springs added to the transmission system are elastically deformed by the force. The resistance encountered when pedaling the pedals is a flexible elastic force. The pedals can be pushed past the section near the top dead center with less force, making riding easier. In this way, the shortcomings of the prior art are improved. Technical Solutions

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical solutions:

[0005] The invention relates to a flexible transmission structure of a bicycle, comprising a spring, a connection auxiliary part and a transmission part. The invention is characterized in that the spring and the connection auxiliary part are added between the transmission parts of the bicycle so that the transmission parts are elastically connected, thereby making the bicycle transmission system have a certain degree of flexibility.

[0006] The spring is a compression spring, the connecting auxiliary part includes a force rod and a stopper, the transmission part includes a right crank and a chain plate, the left crank and the right crank are fixedly connected to the left and right ends of the middle shaft, the chain plate is sleeved on the middle shaft or sleeved on the cylinder of the right crank, and can rotate on the cylinder of the middle shaft or the right crank, the force rod and the stopper are fixed on the chain plate, the force rod is arranged on the front side of the right crank (when the crank is driven to rotate on a bicycle, the side in front of the crank is its front side, and the side behind it is its rear side), the stopper is arranged on the rear side of the right crank, the force block is fixed on the force rod, the upper part of the force rod and the upper part of the right crank are respectively fixed with spring seats, the two ends of the compression spring are sleeved on the two spring seats, and the stopper blocks the right crank to give the compression spring a pre-tightening force.

[0007] The spring is a tension spring, and the connecting auxiliary parts include: a tension rod, a force block, and a stop block. The transmission part includes a right crank and a chain plate. The chain plate is mounted on the middle shaft or on the cylinder of the right crank and can rotate on the middle shaft or the cylinder of the right crank. The tension rod and the force block are fixed on the chain plate. The tension rod is arranged on the rear side of the right crank, and the force block is arranged on the front side of the right crank. The two ends of the tension spring are connected to the upper part of the right crank and the upper part of the tension rod. The stop block fixed on the right crank blocks the tension rod to give the tension spring a pre-tightening force.

[0008] The tension wheel is pressed downward on the lower section of the chain, and the elastic force of the torsion spring makes the lower section of the chain maintain a certain tension to prevent the chain from slacking and falling off.

[0009] The two arms of the torsion spring are respectively blocked on the frame and the lower pendulum, so that the tension wheel pushes up the lower section of the chain from below, so that the lower section of the chain maintains a certain tension to prevent the chain from loosening and falling off.

[0010] The spring is a tension spring, and the connecting auxiliary part includes: a supporting sleeve, a retaining ring, a connecting sleeve, a force block, a driven rod, and a tension rod. The transmission part includes a flywheel and a rear wheel or a rear wheel hub. The supporting sleeve is fixed to the right side of the rear wheel hub of the bicycle, the connecting sleeve is sleeved on the supporting sleeve and can rotate on the supporting sleeve, the retaining ring blocks the connecting sleeve and prevents it from falling out of the supporting sleeve, the flywheel is fixedly connected to the connecting sleeve, the force block and the tension rod are fixed on the connecting sleeve, the driven rod is fixed on the supporting sleeve, and the driven rod is arranged on the rear side of the tension rod (when the flywheel is driven on the bicycle and the tension rod rotates, the front side of the tension rod is its front side, and the rear side is its rear side), the two ends of the tension spring are connected to the upper part of the tension rod and the driven rod respectively, the block fixed on the tension rod blocks the driven rod so that the tension spring has a pre-tightening force, and the force block is arranged on the rear side of the driven rod.

[0011] The spring is a compression spring, and the connection auxiliary part includes: a supporting sleeve, a retaining ring, a connecting sleeve, an active rod, a driven rod, and a stopper. The transmission part includes a flywheel and a rear wheel or a rear wheel hub. The supporting sleeve is fixed to the right side of the rear wheel hub of the bicycle, the connecting sleeve is sleeved on the supporting sleeve and can rotate on the supporting sleeve, the retaining ring blocks the connecting sleeve and prevents it from falling out of the supporting sleeve, the active rod is fixed on the connecting sleeve, the driven rod and the stopper are fixed on the supporting sleeve, the driven rod is arranged on the front side of the active rod, the two ends of the compression spring are sleeved on the spring seats on the upper part of the active rod and the driven rod respectively, the stopper is arranged on the rear side of the active rod, the stopper blocks the active rod to make the compression spring have a pre-tightening force, and the force block is fixed on the driven rod.

[0012] The spring is a tension spring, and the connecting auxiliary part includes: a tension rod, a connecting block, and a stop block. The transmission part includes a right crank and a chain plate. The left crank and the right crank are fixedly connected to the left and right ends of the middle axis. The chain plate is mounted on the middle axis or on the cylinder of the right crank and can rotate on the cylinder of the middle axis or the right crank. The lower end of the tension rod is fixed on the chain plate, and the connecting block is fixed on the front side of the tension rod. A slot is provided on the connecting block. The stop block fixed on the right crank is inserted into the slot of the connecting block. The two ends of the tension spring are connected to the upper part of the right crank and the upper part of the tension rod.

[0013] The spring is a tension spring, and the connecting auxiliary part includes: a driving rod, a stopper, a connecting block, and a pin. The transmission part includes a pedal and a crank, the crank is fixedly connected to the central axis, the connecting block is fixed to the front side of the crank, and a slot is provided on the connecting block. The driving rod is arranged on the outside of the crank, the upper end of which is fixedly connected to the pedal, and the lower end of which is sleeved on the outside of the crank on the central axis. The driving rod can rotate on the central axis, and the stopper fixed on the driving rod is inserted into the slot of the connecting block. The pin passes through the driving rod and is fixedly connected to the driving rod. The part of the central axis through which the pin passes is provided with an annular groove (or partial annular groove). The pin is blocked in this annular groove on the central axis, blocking the axial movement of the driving rod, so that the driving rod can only rotate on the central axis and cannot move axially. The two ends of the tension spring are connected to the upper part of the crank and the upper part of the driving rod.

[0014] The spring is a compression spring, and the connecting auxiliary part includes: a driving rod, a stopper, a connecting block, and a pin. The transmission part includes a pedal and a crank, the crank is fixedly connected to the central axis, the connecting block is fixed to the rear side of the crank, and a slot is provided on the connecting block. The driving rod is arranged on the outside of the crank, the upper end of which is fixedly connected to the pedal, and the lower end of which is sleeved on the outside of the crank on the central axis, and the driving rod can rotate on the central axis. The stopper fixed on the driving rod is inserted into the slot on the connecting block, and the pin passes through the driving rod and is fixedly connected to the driving rod. The part of the central axis through which the pin passes is provided with an annular groove (or partial annular groove), and the pin is blocked in this annular groove on the central axis, blocking the axial movement of the driving rod, so that the driving rod can only rotate on the central axis and cannot move axially. The two ends of the compression spring are sleeved on the spring seats on the upper part of the crank and the upper part of the driving rod. Beneficial effects

[0015] The flexible transmission structure of a bicycle is to add a spring and a connecting auxiliary part to one of the links of the right crank and chain plate, the chain and frame, the flywheel and the rear wheel, and the pedal and crank of the bicycle, so that the transmission parts are elastically connected, and the transmission system from the pedal to the rear wheel has a certain flexibility. When riding a bicycle uphill or accelerating, when pedaling the pedal beyond the top dead center, the spring added to the transmission system is elastically deformed by the force, and the resistance encountered when pedaling the pedal is a flexible elastic force. In this way, the pedal can be pushed through the section near the top dead center with less force, which can reduce leg fatigue caused by pedaling near the top dead center, and can make the pedal quickly pass the top dead center and enter the section with larger driving torque, making uphill riding or accelerating easier. This type of flexible transmission structure of a bicycle can improve the shortcomings of the above-mentioned existing technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic structural diagram of a first embodiment of the present invention;

[0017] FIG2 is a schematic structural diagram of a second embodiment of the present invention:

[0018] FIG3 is a schematic structural diagram of a third embodiment of the present invention;

[0019] FIG4 is a schematic structural diagram of a fourth embodiment of the present invention;

[0020] FIG5 is a schematic structural diagram of a fifth embodiment of the present invention;

[0021] FIG6 is a schematic structural diagram of a sixth embodiment of the present invention;

[0022] FIG7 is a structural diagram of a seventh embodiment of the present invention;

[0023] FIG8 is a schematic structural diagram of an eighth embodiment of the present invention;

[0024] FIG9 is a schematic structural diagram of embodiment 9 of the present invention. Best Mode for Carrying Out the Invention

[0025] See Figure 1, Example 1 of the present invention, comprising: a stopper 2, a right crank 3, a compression spring 5, a force rod 6, a chain disc 7, and a central axis 8. The left crank 9 and the right crank 3 are fixedly connected to the left and right ends of the central axis 8. The chain disc 7 is mounted on the central axis 8 or on the cylinder of the right crank 3 and can rotate on the cylinder of the central axis 8 or the right crank 3. The force rod 6 and the stopper 2 are fixed to the chain disc 7. The force rod 6 is arranged on the front side of the right crank 3 (when the crank is driven to rotate on a bicycle, the front side of the crank is its front side and the rear side is its rear side). The stopper 2 is arranged on the rear side of the right crank 3. A force block A is fixed to the force rod 6. The upper part of the force rod 6 and the upper part of the right crank 3 are respectively fixed with spring seats. The two ends of the compression spring 5 are mounted on these two spring seats. The stopper 2 blocks the right crank 3 so that the compression spring 5 has a preload force.

[0026] When riding uphill or accelerating, when the right pedal 4 rotates to near the top dead center, the compression spring 5 is compressed by pedaling the right pedal 4 clockwise. With less force, the right pedal 4 can be pushed past the top dead center, so that the right pedal 4 quickly enters the section with large driving torque, and the compression spring 5 is further compressed. After the right crank 3 contacts the force block A, the pedaling force on the right pedal 4 that continues to increase directly and rigidly acts on the chain disk 7. The force block A blocks the right crank 3 to prevent the compression spring 5 from being crushed. When the right pedal 4 rotates to near the bottom dead center, the driving torque decreases, and the pressure on the compression spring 5 decreases. At this time, the bicycle travels by inertia, and the compression spring 5 extends (the right crank 3 contacts the block 2), pushing the chain disk 7 to rotate clockwise more by some angles, preparing for the subsequent left pedal 10 to be easily pedaled past the top dead center. At this time, the left pedal 10 rotates to near the top dead center When the left pedal 10 is near, the compression spring 5 is compressed, and the left pedal 10 can be pushed past the top dead center with a smaller force, so that the left pedal 10 quickly enters the section with large driving torque, and the compression spring 5 is further compressed. After the right crank 3 contacts the force block A, the pedaling force on the left pedal 10 that continues to increase directly and rigidly acts on the chain disk 7. When the left pedal 10 rotates to near the bottom dead center, the driving torque decreases, the pressure on the compression spring 5 decreases, and the compression spring 5 extends (the right crank 3 contacts the stop block 2), preparing for the right pedal 4 to easily pass the top dead center. At this time, the right pedal 4 rotates to near the top dead center, and the left and right pedals are stepped on in turn, each rotating half a circle around the central axis, driving the chain disk 7 to rotate, pulling the upper section of the chain 1 to drive the bicycle forward. The compression spring 5 is compressed and extended twice when the pedal rotates one circle. Modes for Carrying Out the Invention

[0027] Specific implementation method:

[0028] See Figure 1, Example 1 of the present invention, comprising: a stopper 2, a right crank 3, a compression spring 5, a force rod 6, a chain disc 7, and a central axis 8. The left crank 9 and the right crank 3 are fixedly connected to the left and right ends of the central axis 8. The chain disc 7 is mounted on the central axis 8 or on the cylinder of the right crank 3 and can rotate on the cylinder of the central axis 8 or the right crank 3. The force rod 6 and the stopper 2 are fixed to the chain disc 7. The force rod 6 is arranged on the front side of the right crank 3 (when the crank is driven to rotate on a bicycle, the front side of the crank is its front side and the rear side is its rear side). The stopper 2 is arranged on the rear side of the right crank 3. A force block A is fixed to the force rod 6. The upper part of the force rod 6 and the upper part of the right crank 3 are respectively fixed with spring seats. The two ends of the compression spring 5 are mounted on these two spring seats. The stopper 2 blocks the right crank 3 so that the compression spring 5 has a preload force.

[0029] When riding uphill or accelerating, when the right pedal 4 rotates to near the top dead center, the compression spring 5 is compressed by pedaling the right pedal 4 clockwise. With less force, the right pedal 4 can be pushed past the top dead center, so that the right pedal 4 quickly enters the section with large driving torque, and the compression spring 5 is further compressed. After the right crank 3 contacts the force block A, the pedaling force on the right pedal 4 that continues to increase directly and rigidly acts on the chain disk 7. The force block A blocks the right crank 3 to prevent the compression spring 5 from being crushed. When the right pedal 4 rotates to near the bottom dead center, the driving torque decreases, and the pressure on the compression spring 5 decreases. At this time, the bicycle travels by inertia, and the compression spring 5 extends (the right crank 3 contacts the block 2), pushing the chain disk 7 to rotate clockwise more by some angles, preparing for the subsequent left pedal 10 to be easily pedaled past the top dead center. At this time, the left pedal 10 rotates to near the top dead center When the left pedal 10 is near, the compression spring 5 is compressed, and the left pedal 10 can be pushed past the top dead center with a smaller force, so that the left pedal 10 quickly enters the section with large driving torque, and the compression spring 5 is further compressed. After the right crank 3 contacts the force block A, the pedaling force on the left pedal 10 that continues to increase directly and rigidly acts on the chain disk 7. When the left pedal 10 rotates to near the bottom dead center, the driving torque decreases, the pressure on the compression spring 5 decreases, and the compression spring 5 extends (the right crank 3 contacts the stop block 2), preparing for the right pedal 4 to easily pass the top dead center. At this time, the right pedal 4 rotates to near the top dead center, and the left and right pedals are stepped on in turn, each rotating half a circle around the central axis, driving the chain disk 7 to rotate, pulling the upper section of the chain 1 to drive the bicycle forward. The compression spring 5 is compressed and extended twice when the pedal rotates one circle.

[0030] See Figure 2, embodiment 2 of the present invention, including: a tension rod 13, a tension spring 14, a right crank 15, a force block 16, a chain plate 17, and a central axis 18. The left crank 19 and the right crank 15 are fixedly connected to the left and right ends of the central axis 18. The chain plate 17 is mounted on the central axis 18 or on the cylinder of the right crank 15 and can rotate on the central axis 18 or the cylinder of the right crank 15. The tension rod 13 and the force block 16 are fixed to the chain plate 17. The tension rod 13 is arranged on the rear side of the right crank 15, and the force block 16 is arranged on the front side of the right crank 15. The two ends of the tension spring 14 are connected to the upper part of the right crank 15 and the upper part of the tension rod 13. The stopper B fixed on the right crank 15 blocks the tension rod 13 (the stopper can also be fixed on the tension rod 13 to block the right crank 15) so that the tension spring 14 has a pre-tightening force. When the pedal is stepped on, the tension on the tension spring 14 increases. After it stretches to a certain extent, the right crank 15 contacts the force block 16, and the further increasing driving force directly acts on the chain plate 17. The principle and process of this embodiment that makes it easy to step over the top dead center of the pedal are basically the same as those of the first embodiment.

[0031] The springs in the first and second embodiments may also be leaf springs or the like.

[0032] In the first and second embodiments, a self-lubricating bearing or a needle bearing may be provided between the cylinder of the middle shaft or the right crank and the hole of the chain disc to reduce friction.

[0033] See Figure 3, embodiment 3 of the present invention, including: a flywheel 20, a frame 21, an upper swing arm 22, a tension spring 23, a limit rod 24, a tension wheel 25, a chain 26, a chain plate 27, a tension wheel 28, a lower swing arm 29, and a torsion spring 30. The chain 26 is intentionally made longer so that it has a certain degree of slack in the free state. One end of the upper swing arm 22 is hinged to the frame 21, and the other end is connected to the tension wheel 25. The tension wheel 25 is a small sprocket or a small pulley. The tension spring 23 is arranged below the upper swing arm 22, and one end of the tension spring 23 is connected to the upper swing arm 22, and the other end is connected to the frame 21. The tension wheel 25 presses downward from above on the upper section of the chain 26 that transmits power between the chain disc 27 and the flywheel 20. The lower end of the limit rod 24 is fixed to the frame, and its upper end is under the upper swing link 22. One end of the lower swing link 29 is also hinged on the frame 21, and the other end is connected to the tension wheel 28, which is also a small sprocket or a small pulley. The two arms of the torsion spring 30 are respectively blocked on the frame 21 and the lower swing link 29. The tension wheel 28 presses downward from above on the lower section of the chain 26. The elastic force of the torsion spring 30 keeps a certain tension in the lower section of the chain 26 to prevent the chain from loosening and falling off.

[0034] When riding a bicycle uphill or accelerating, when the left pedal L rotates to the vicinity of the bottom dead center, the driving torque decreases, and the tension on the upper section of the chain 26 that transmits the driving force decreases. The tension spring 23 pulls the upper swing rod 22 to swing downward, and the tension wheel 25 presses the upper section of the chain 26 downward. At this time, the bicycle travels by inertia, and the upper section of the chain 26 pulls the flywheel 20 to rotate clockwise by a certain angle, so that the upper section of the chain 26 forms a curve and increases its length. When the right pedal R rotates to the top dead center, the right pedal R is rotated clockwise, pulling the upper section of the chain 26. The tension of the upper section of the chain 26 extends the tension spring 23 and shortens the length of the upper section of the chain 26. At this time, the upper section of the chain 26 is elastic or flexible like a tension spring. The resistance encountered when pushing the right pedal R is the elastic or flexible resistance from the upper section of the chain 26. Therefore, the right pedal R can be pushed past the top dead center with less force. When the right pedal R rotates to the bottom dead center, the tension in the upper section of the chain 26 decreases, and the tension spring 23 pulls the tension wheel 25 downward to lengthen the upper section of the chain 26, preparing for the left pedal L to easily pass the top dead center. At this time, the left pedal L rotates to the top dead center. When the left pedal L rotates clockwise, the upper section of the chain 26 is pulled, and the tension in the upper section of the chain 26 makes The tension spring 23 stretches, shortening the upper length of the chain 26. The upper section of the chain 26 is elastic or flexible like a tension spring. With less force, the left pedal L can be pushed past the top dead center, allowing the left pedal L to quickly enter the section with large driving torque. In this way, the left and right pedals are rotated half a circle each to drive the bicycle forward. When the pedals rotate one circle, the upper section of the chain 26 becomes longer and shorter twice, and the tension pulley 25 and the tension pulley 28 swing up and down twice.

[0035] The upper end of the limit rod 24 is pressed against the bottom of the upper swing rod 22, which can control the increase in the length of the upper section of the chain 26. A screw can also be set at the upper end of the limit rod 24 to adjust the increase in the length of the upper section of the chain 26, thereby controlling and adjusting the angle of the section near the top dead center that the pedal is easily stepped through.

[0036] 4, embodiment 4 of the present invention includes: a flywheel 31, a frame 32, an upper swing arm 33, a tension spring 34, a tension pulley 35, a chain 36, a chain plate 37, a limit rod 38, a tension pulley 39, a lower swing arm 40, and a torsion spring 41. The chain 36 is intentionally made longer so that it has a certain degree of slack in a free state. One end of the upper swing arm 33 is hinged to the frame 32, and the other end is connected to the tension pulley 35. The tension spring 34 is arranged on the upper swing arm 33. The tension pulley 35 pushes the upper section of the chain 36 upward from the bottom, pulling upward the section connected to the chain plate 37 and the flywheel 31. The upper section of the chain 36 that transmits power between them increases its length. The lower end of the limit rod 38 is fixed to the frame 32, and its upper end hooks the upper swing rod 33 downward to control the increase in the length of the upper section of the chain. One end of the lower swing rod 40 is also hinged to the frame 32, and the other end is connected to the tension wheel 39. The two arms of the torsion spring 41 are blocked on the frame 32 and the lower swing rod 40, so that the tension wheel 39 pushes the lower section of the chain 36 from below, so that the lower section of the chain maintains a certain tension. The principle and process of making it easy for the pedal to pass the top dead center in this embodiment are basically the same as those in Example 3.

[0037] The springs in the third and fourth embodiments may also be compression springs, elastic ropes, elastic bands, or other rubber springs, and the auxiliary connection parts may also be changed accordingly.

[0038] In a bicycle equipped with a transmission, the transmission applies elastic force to the lower section of the chain through the guide wheel to create tension thereon. Therefore, the portion of the third and fourth embodiments for applying tension to the lower section of the chain is unnecessary.

[0039] See Figure 5, embodiment 5 of the present invention, including: a support sleeve 42, a retaining ring 43, a connecting sleeve 44, a flywheel 45, a force block 46, a driven rod 48, a tension spring 49, a tension rod 50, and a chain 51. The support sleeve 42 is fixed to the right side of the rear wheel hub of the bicycle, the connecting sleeve 44 is sleeved on the support sleeve 42 and can rotate on the support sleeve 42. The retaining ring 43 blocks the connecting sleeve 44 from coming out of the support sleeve 42. The flywheel 45 is fixedly connected to the connecting sleeve 44. The force block 46 and the tension rod 50 are fixed to the connecting sleeve 44. (flange flange), the driven rod 48 is fixed on (the flange flange of) the support sleeve 42, and the driven rod 48 is arranged on the rear side of the tension rod 50 (when the flywheel 45 is driven and the tension rod 50 is rotated on the bicycle, the front side of the tension rod 50 is its front side, and the rear side is its rear side), the two ends of the tension spring 49 are connected to the upper part of the tension rod 50 and the driven rod 48 respectively, and the stopper C fixed on the tension rod 50 blocks the driven rod 48 so that the tension spring 49 has a pre-tightening force, and the force block 46 is arranged on the rear side of the driven rod 48.

[0040] When one of the two pedals rotates to near the lower dead center, the driving torque decreases, and the driving tension on the upper section of the chain 51 decreases. The other pedal rotates to near the upper dead center, and the pedal near the upper dead center is stepped on clockwise. The chain 51 drives the flywheel to rotate clockwise, and the tension rod 50 pulls the tension spring 49 to stretch it. The resistance encountered by the pedal near the upper dead center when it is stepped over the upper dead center is elastic force and is flexible, so it can be stepped over the upper dead center more easily, so that this pedal quickly enters the section with large driving torque. After the driving torque increases and the tension spring 49 is stretched to a certain extent, the driven rod 48 contacts the force block 46, and the driving force that continues to increase directly acts on the rear wheel or the rear wheel hub. This can protect the tension spring 49 from being damaged. The two pedals take turns to easily step over the upper dead center to drive the bicycle forward. The tension spring 49 is stretched and shortened twice when the pedal rotates one circle.

[0041] See Figure 6, embodiment 6 of the present invention, including: a support sleeve 53, a retaining ring 54, a connecting sleeve 55, a flywheel 56, a block 57, an active rod 58, a compression spring 59, and a driven rod 60. The support sleeve 53 is fixed to the right side of the rear wheel hub of the bicycle, the connecting sleeve 55 is sleeved on the support sleeve 53 and can rotate on the support sleeve 53. The retaining ring 54 blocks the connecting sleeve 55 from coming out of the support sleeve 53. The flywheel 56 is fixedly connected to the connecting sleeve 55, the active rod 58 is fixed to (the flange of) the connecting sleeve 55, and the driven rod 60 and the block 57 are fixed to (the flange of) the support sleeve 53. On the upper side, the driven rod 60 is arranged on the front side of the active rod 58, and the two ends of the compression spring 59 are mounted on the spring seats on the upper parts of the active rod 58 and the driven rod 60 respectively. The block 57 is arranged on the rear side of the active rod 58. The block 57 blocks the active rod 58 so that the compression spring 59 has a pre-tightening force. After the driving torque increases, the compression spring 59 is compressed. After the active rod 58 contacts the force block D fixed on the driven rod 60, the driving force that continues to increase directly acts on the rear wheel or the rear wheel hub, which can protect the compression spring 59 from being crushed. The principle and process of the pedal being easily stepped over the top dead center are basically the same as those in Example 5.

[0042] In the fifth and sixth embodiments, a self-lubricating bearing or a needle roller bearing may be provided between the supporting sleeve and the connecting sleeve to reduce friction.

[0043] See Figure 7, embodiment seven of the present invention, including: a tension rod 70, a tension spring 71, a right crank 72, a chain plate 73, and a central shaft 74. The left crank 75 and the right crank 72 are fixedly connected to the left and right ends of the central shaft 74. The chain plate 73 is mounted on the central shaft 74 or on the cylinder of the right crank 72 and can rotate on the cylinder of the central shaft 74 or the right crank 72. The lower end of the tension rod 70 is fixed to the chain plate 73, and the connecting block C is fixed to the front side of the tension rod 70. The connecting block C is provided with a slot, and the stopper A fixed on the right crank 72 is inserted into the connecting block C. The two ends of the tension spring 71 are connected to the upper part of the right crank 72 and the upper part of the tension rod 70. The B surface of the slot hole on the connecting block C blocks the block A to preload the tension spring 71. When the pedal is stepped on, the tension spring 71 is subjected to an increased tension force. After stretching to a certain extent, the block A contacts the D surface of the slot hole on the connecting block C. The driving force that continues to increase acts directly on the chain plate 73 through the tension rod 70, avoiding damage to the tension spring 71 by excessive force. The principle and process of making the pedal easily pass the top dead center in this embodiment are basically the same as those in the first and second embodiments.

[0044] See Figure 8, embodiment eight of the present invention, including: a crank 80, a tension spring 81, a pedal 82, a drive rod 83, a chain plate 84, a central axis 85, and a pin 87. The right crank 80 (fixed together with the chain plate 84) is fixedly connected to the central axis 85, and the connecting block C is fixed to the front side of the crank 80. The connecting block C is provided with a slot. The drive rod 83 is arranged on the outside of the crank 80, and its upper end is fixedly connected to the pedal 82, and its lower end is sleeved on the outside of the crank 80 on the central axis 85. The drive rod 83 can rotate on the central axis 85 and is fixed to the front side of the crank 80. The stopper A on the driving rod 83 is inserted into the slot of the connecting block C, and the pin 87 passes through the driving rod 83 and is fixedly connected to the driving rod 83. The portion on the central axis 85 through which the pin 87 passes is provided with an annular groove (or partial annular groove). The pin 87 is blocked in this annular groove on the central axis 85, blocking the axial movement of the driving rod 83, so that the driving rod 83 can only rotate on the central axis 85 and cannot move axially. The two ends of the tension spring 81 are connected to the upper part of the crank 80 and the upper part of the driving rod 83. The B surface of the slot on the connecting block C blocks the stopper A so that the tension spring 81 has a pre-tightening force.

[0045] The left crank is fixedly connected to the middle shaft 85 on the left side of the frame, and the left drive rod 86 is sleeved on the outside of the left crank. The structures of the left and right sides are the same.

[0046] When pedal 82 is stepped on clockwise near the top dead center, driving rod 83 swings clockwise and tension spring 81 is stretched. Pedal 82 can be easily stepped past the top dead center and enters the section with large driving torque. As the driving torque increases, the tension on tension spring 81 increases. After block A contacts the D surface of the slot hole on connecting block C, the driving force that continues to increase acts directly on chain disk 84 through crank 80, avoiding damage to tension spring 81 by excessive force. When pedal 82 rotates to the bottom dead center, the left pedal fixedly connected to the left driving rod 86 rotates to the top dead center. The same as the right driving process, the left pedal can be easily stepped past the top dead center.

[0047] See Figure 9, embodiment 9 of the present invention, including: a drive rod 90, a pedal 91, a compression spring 92, a crank 93, a chain plate 94, a central axis 95, and a pin 97. The right crank 93 (fixed together with the chain plate 94) is fixedly connected to the central axis 95, and a connecting block C is fixed to the rear side of the crank 93. A slot is provided on the connecting block C. The drive rod 90 is arranged on the outside of the crank 93, and its upper end is fixedly connected to the pedal 91, and its lower end is sleeved on the outside of the crank 93 on the central axis 95. The drive rod 90 can rotate on the central axis 95 and is fixed to the drive rod. The stopper A on 90 is inserted into the slot on the connecting block C, and the pin 97 passes through the drive rod 90 and is fixedly connected to the drive rod 90. The portion through which the pin 97 passes on the central axis 95 is provided with an annular groove (or a partial annular groove). The pin 97 is blocked in this annular groove on the central axis 95, blocking the axial movement of the drive rod 90, so that the drive rod 90 can only rotate on the central axis 95 and cannot move axially. The two ends of the compression spring 92 are mounted on the upper part of the crank 93 and the spring seat on the upper part of the drive rod 90. The B surface of the slot on the connecting block C blocks the stopper A so that the compression spring 92 has a preload force.

[0048] The left crank is fixedly connected to the middle shaft 95 on the left side of the frame, and the left drive rod 96 is sleeved on the outside of the left crank. The structures of the left and right sides are the same.

[0049] When pedal 91 is stepped on clockwise near the top dead center, the drive rod 90 swings clockwise and the compression spring 92 is compressed. The pedal 91 can be easily stepped past the top dead center and enter the section with large driving torque. As the driving torque increases, the pressure on the compression spring 92 increases. After the block A contacts the D surface of the slot hole on the connecting block C, the driving force that continues to increase directly acts on the chain disk 94 through the crank 93 to prevent the compression spring 92 from being damaged by too much force. When the pedal 91 rotates to the bottom dead center, the left pedal fixedly connected to the left drive rod 96 rotates to the top dead center. The same as the right driving process, the left pedal can be easily stepped past the top dead center.

[0050] The flexible transmission structure of the above embodiment can also be used in bicycles such as tricycles. Industrial Applicability

[0051] The flexible driving transmission structure is to add a spring and a connecting auxiliary part to one of the links of the right crank and chain plate, the chain and frame, the flywheel and the rear wheel, and the pedal and crank of the bicycle, so that the transmission parts are elastically connected, and the transmission system from the pedal to the rear wheel has a certain flexibility. When riding a bicycle uphill or accelerating, when pedaling the pedal beyond the top dead center, the spring added to the transmission system is elastically deformed under force, and the resistance encountered when pedaling the pedal is a flexible elastic force. In this way, the pedal can be pushed through the section near the top dead center with less force, which can reduce leg fatigue caused by pedaling near the top dead center, and can make the pedal quickly pass the top dead center and enter the section with larger driving torque, making uphill riding or accelerating easier. This type of flexible transmission structure for bicycles can improve the shortcomings of the above-mentioned existing technologies. Sequence Listing Free Content

[0052] Type your sequence listing free description paragraph here.

Claims

1. A bicycle flexible transmission structure, comprising: The invention relates to a spring, a connection auxiliary part and a transmission part. The invention is characterized in that the spring and the connection auxiliary part are added between the transmission parts of the bicycle so that the transmission parts are elastically connected and the bicycle transmission system has a certain flexibility.

2. The bicycle flexible transmission structure according to claim 1, wherein the transmission member comprises a right crank and a chain plate, and the left crank and the right crank are fixedly connected to the left and right ends of the middle axis, characterized in that: The chain plate is sleeved on the middle shaft or on the cylinder of the right crank and can rotate on the middle shaft or the cylinder of the right crank.

3. The bicycle flexible transmission structure according to claim 1, wherein the transmission member comprises: The chain plate, frame, flywheel and chain are characterized in that: the chain is intentionally made longer so that it has a certain degree of slack in a free state, and a spring and a connecting auxiliary part are added between the frame and the upper section of the chain that transmits power, so that the upper section of the chain is subjected to elastic forces in the up and down directions, forming a curve to increase its length, thereby making the connection between the chain plate and the flywheel in the upper section that transmits power have a certain elasticity or flexibility.

4. The bicycle flexible transmission structure according to claim 1, characterized in that: The connection auxiliary part includes: a supporting sleeve, a retaining ring, and a connecting sleeve. The transmission part includes a flywheel and a rear wheel or a rear wheel hub. The supporting sleeve is fixed to the right side of the rear wheel hub of the bicycle. The connecting sleeve is sleeved on the supporting sleeve and can rotate on the supporting sleeve. The retaining ring blocks the connecting sleeve and prevents it from falling out of the supporting sleeve. The flywheel is fixedly connected to the connecting sleeve.

5. The bicycle flexible transmission structure according to claims 1 and 2, wherein the spring is a compression spring, characterized in that: The connecting auxiliary part includes a force-bearing rod and a stopper, which are fixed on the chain plate. The force-bearing rod is arranged on the front side of the right crank. When the crank is driven to rotate on the bicycle, the side in front of the crank is its front side, and the side behind it is its rear side. The stopper is arranged on the rear side of the right crank. The force block is fixed on the force-bearing rod, and spring seats are respectively fixed on the upper part of the force-bearing rod and the upper part of the right crank. The two ends of the compression spring are mounted on the two spring seats. The stopper blocks the right crank to give the compression spring a pre-tightening force.

6. The bicycle flexible transmission structure according to claims 1 and 2, wherein the spring is a tension spring, characterized in that: The connection auxiliary parts include: a tension rod, a force block, and a stop block. The tension rod and the force block are fixed on the chain plate. The tension rod is arranged on the rear side of the right crank, and the force block is arranged on the front side of the right crank. The two ends of the tension spring are connected to the upper part of the right crank and the upper part of the tension rod. The stop block fixed on the right crank blocks the tension rod so that the tension spring has a pre-tightening force.

7. The bicycle flexible transmission structure according to claims 1 and 3, wherein the spring is a tension spring, characterized in that: The connecting auxiliary parts include: an upper swing link, a tensioning wheel, a limiting rod, a tension wheel, a lower swing link, and a torsion spring. One end of the upper swing link is hinged on the frame, and the other end is connected to the tensioning wheel. One end of the lower swing link is also hinged on the frame, and the other end is connected to the tensioning wheel. The tension spring is arranged under the upper swing link, one end of the tension spring is connected to the upper swing link, and the other end is connected to the frame. The tensioning wheel presses down from above on the upper section of the chain that transmits power between the chain disc and the flywheel. The lower end of the limiting rod is fixed on the frame, and the upper end of the limiting rod is against the bottom of the upper swing link. The two arms of the torsion spring are respectively blocked on the frame and the lower swing link, and the tension wheel presses down from above on the lower section of the chain, so that the lower section of the chain maintains a certain tension to prevent the chain from loosening and falling off.

8. The bicycle flexible transmission structure according to claims 1 and 3, wherein the spring is a tension spring, and the connection auxiliary member comprises: An upper swing link, a tensioning wheel, a limiting rod, a tension wheel, a lower swing link, and a torsion spring, one end of the upper swing link is hinged on the frame, and the other end is connected to the tensioning wheel, one end of the lower swing link is also hinged on the frame, and the other end is connected to the tensioning wheel, which is characterized in that: the tension spring is arranged on the upper swing link, one end of the tension spring is connected to the upper swing link, and the other end is connected to the frame, the tensioning wheel pushes up from below the upper section of the chain that transmits power between the chain disc and the flywheel, the lower end of the limiting rod is fixed to the frame, and the upper end of the limiting rod hooks the upper swing link downward, and the two arms of the torsion spring are respectively blocked on the frame and the lower swing link, and the torsion spring force causes the tension wheel to push up from below the lower section of the chain, so that the lower section of the chain maintains a certain tension.

9. The bicycle flexible transmission structure according to claims 1 and 4, wherein the spring is a tension spring, characterized in that: The connecting auxiliary part also includes: a force block, a driven rod, and a tension rod. The force block and the tension rod are fixed on the connecting sleeve, the driven rod is fixed on the supporting sleeve, and the driven rod is arranged on the rear side of the tension rod. When the flywheel and the tension rod are driven to rotate on the bicycle, the front side of the tension rod is its front side, and the rear side is its rear side. The force block is arranged on the rear side of the driven rod, and the two ends of the tension spring are connected to the upper part of the tension rod and the driven rod respectively. The block fixed on the tension rod blocks the driven rod to make the tension spring have pre-tightening force.

10. The bicycle flexible transmission structure according to claims 1 and 4, wherein the spring is a compression spring, characterized in that: The connection auxiliary part also includes: an active rod, a driven rod, and a stopper. The active rod is fixed on the connecting sleeve, the driven rod and the stopper are fixed on the supporting sleeve, the driven rod is arranged on the front side of the active rod, the two ends of the compression spring are sleeved on the spring seats on the upper part of the active rod and the driven rod respectively, the stopper is arranged on the rear side of the active rod, the stopper blocks the active rod so that the compression spring has a pre-tightening force, and a force block is fixed on the driven rod.

11. The bicycle flexible transmission structure according to claims 1 and 2, wherein the spring is a tension spring, characterized in that: The connection auxiliary parts include: a tension rod, a connecting block, and a stopper. The lower end of the tension rod is fixed on the chain plate, the connecting block is fixed on the front side of the tension rod, and a slot is provided on the connecting block. The stopper fixed on the right crank is inserted into the slot of the connecting block. The two ends of the tension spring are connected to the upper part of the right crank and the upper part of the tension rod.

12. The bicycle flexible transmission structure according to claim 1, wherein the transmission member comprises pedals and a crank, and the crank is fixedly connected to the central axis, characterized in that: The connecting auxiliary parts include: a driving rod, a block, a connecting block, and a pin. The connecting block is fixed on the crank, and a slot is provided on the connecting block. The driving rod is arranged on the outside of the crank, and its upper end is fixedly connected to the pedal, and its lower end is sleeved on the outside of the crank on the central axis. The block fixed on the driving rod is inserted into the slot of the connecting block, and the pin passes through the driving rod and is fixedly connected to the driving rod. The position on the central axis through which the pin passes is provided with an annular groove, and the pin is blocked in the annular groove on the central axis to prevent the driving rod from moving axially, so that the driving rod can only rotate on the central axis and cannot move axially.

13. The bicycle flexible transmission structure according to claims 1 and 12, wherein the spring is a tension spring, characterized in that: The connecting block is fixed on the front side of the crank, and the two ends of the tension spring are connected to the upper part of the crank and the upper part of the driving rod.

14. The bicycle flexible transmission structure according to claims 1 and 12, wherein the spring is a compression spring, characterized in that: The connecting block is fixed on the rear side of the crank, and the two ends of the compression spring are sleeved on the spring seats on the upper part of the crank and the upper part of the driving rod.

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