Manual stepless speed change device and bicycle

Abstract

The utility model relates to a manual stepless speed change device, which comprises a speed change fixing piece, a speed change shaft and a speed change shaft, the variable-speed rotating part is located below the variable-speed fixing part, and the variable-speed rotating part is arranged on a main shaft of the hub in a sleeving mode and can rotate around the main shaft; the transmission rope is arranged in the circumferential direction of the outer circumferential wall of the variable-speed rotating part and located on the outer side wall of the variable-speed rotating part, a fixing mechanism for fixing the transmission rope to the outer side wall of the variable-speed rotating part is arranged on the variable-speed rotating part, and the two ends of the transmission rope penetrate out of the through holes of the variable-speed fixing part to the outer side of the variable-speed fixing part. The transmission rope is fixed to the outer side wall of the variable-speed rotating part and divided into two sub-transmission ropes with the fixing mechanism as a node, one end of each sub-transmission rope is free, the other end of each sub-transmission rope is fixed, and the variable-speed rotating part rotates by pulling the sub-transmission ropes. Therefore, the sum of the rotation angles which can be reached by pulling the two sub-transmission ropes is maximum.

Description

Technical Field

[0001] This utility model relates to the field of bicycle transmission technology, and in particular to a manual continuously variable transmission device and a bicycle. Background Technology

[0002] A bicycle derailleur is a device on a bicycle used to change gear ratios to adapt to different riding conditions. It allows riders to ride more easily and efficiently at different speeds and on different terrains. Bicycle derailleurs include internal derailleurs and external derailleurs. Internal derailleurs, also known as hub internal derailleur systems, are a type of gear-changing device installed inside the bicycle hub, allowing riders to change gear ratios without using an external derailleur.

[0003] Chinese invention patent CN110871872B discloses a continuously variable transmission (CVT) device for bicycles, comprising a freewheel, drive chainring, hub cover, input ring, main body retainer, output ring, hub, shifter, derailleur, and spindle. Pressure rings are located between the main body retainer and the input ring, and between the main body retainer and the output ring. A shifter support frame and a pair of hemispheres are fixed on the main body retainer. The shifter support frame is engaged with shifter teeth, which are threadedly connected to a shifter screw. A brake pad is bolted to the small end of the hub. After installing the CVT device on a bicycle, turning the manual shifter on the handlebars causes the shifter to move the shifter teeth. The shifter teeth cause the two hemispheres to swing laterally left and right, creating a diameter difference at the contact points between the pressure rings and the corresponding hemispheres. Since the two hemispheres are fastened together to form a single sphere, this diameter difference change is stepless, thus achieving CVT while riding the bicycle.

[0004] However, the continuously variable transmission (CVT) device in the aforementioned invention patent CN110871872B has shortcomings: although the transmission can be controlled by the manual gear selector on the handlebars, and then the transmission can control the gear adjuster to perform continuously variable transmission, the transmission still has the problem of a small gear range. Utility Model Content

[0005] The first technical problem to be solved by this utility model is to provide a manual continuously variable transmission device with a wider speed range, in light of the current state of the prior art.

[0006] The second technical problem to be solved by this utility model is to provide a bicycle that uses the above-mentioned manual continuously variable transmission device, in view of the current status of the prior art.

[0007] The technical solution adopted by this utility model to solve the first technical problem mentioned above is: a manual continuously variable transmission device, comprising:

[0008] The gear shifting fastener is configured to be fitted onto and fixed to the main shaft of the hub, and the gear shifting fastener is provided with through holes.

[0009] A speed-changing rotating component is located below the speed-changing fixed component. This speed-changing rotating component is sleeved on the main shaft of the hub and can rotate around the main shaft.

[0010] A transmission rope is arranged circumferentially along the outer periphery of the speed-changing rotating component and located on the outer side wall of the speed-changing rotating component. The speed-changing rotating component is provided with a fixing mechanism to fix the transmission rope to the outer side wall of the speed-changing rotating component. Both ends of the transmission rope pass through the through holes of the speed-changing fixing component to the outside of the speed-changing fixing component. When either end of the transmission rope is pulled, the speed-changing rotating component rotates around the main shaft.

[0011] Preferably, the outer peripheral wall of the speed-changing rotating component has a clearance groove arranged circumferentially along the rotating component, and the transmission rope is arranged in the clearance groove in a wrapping manner. This design avoids vertical displacement of the transmission rope when it is pulled.

[0012] Preferably, the gear shift fixing member has a protrusion extending radially outward and then downward from its edge. The protrusion has a through hole that penetrates radially through it, and the through hole corresponds to the position of the clearance groove. With this design, the transmission rope is wound laterally within the clearance groove, and the through hole corresponds to the position of the clearance groove, ensuring that the transmission rope is not subjected to a vertical force within the clearance groove. Simultaneously, the space between the protrusion and the gear shift fixing member facilitates the passage of the fixing mechanism, preventing the fixing mechanism from affecting the rotation of the gear shifting component.

[0013] To simplify the structure of the gear shifting component, the fixing mechanism includes a first positioning block disposed on the outer peripheral wall of the gear shifting component. The first positioning block is provided with a threading hole for the transmission rope to pass through. The first positioning block is also provided with a screw hole communicating with the threading hole. The transmission rope is fixed in the threading hole by a screw passing through the screw hole.

[0014] Preferably, the transmission rope includes a first moving rope and a second moving rope, wherein a first end of the first moving rope and a first end of the second moving rope both pass through the perforation;

[0015] The threading hole extends downwards from the top surface of the first positioning block, then extends to both sides to form a left channel and a right channel; the second end of the first moving rope is fixed in the left channel, and the second end of the second moving rope is fixed in the right channel. Using this scheme, the transmission rope is divided into two strands and fixed separately, making the fixation of the transmission rope more secure.

[0016] Preferably, the first positioning block is provided with:

[0017] A left screw hole communicates with the left channel, and the second end of the first moving rope is fixed in the left channel by a screw passing through the left screw hole;

[0018] The right screw hole communicates with the right channel, and the second end of the second movable rope is fixed in the right channel by a screw passing through the right screw hole. Screws pass through the left and right screw holes to fix the first and second movable ropes in the left and right channels respectively.

[0019] Preferably, the fixing mechanism further includes a second positioning block located to the left of the first positioning block and another second positioning block located to the right of the first positioning block. The second end of the first movable rope passes through the left channel and is fixed in the second positioning block to the left of the first positioning block, and the second end of the second movable rope passes through the right channel and is fixed in the second positioning block to the right of the first positioning block. This design further ensures a more secure fixation of the transmission rope.

[0020] Preferably, the lower surface of the gear shift fixing member extends downward to form a central shaft, and the center of the gear shift rotating member is provided with an annular groove to accommodate the central shaft. The lower end of the gear shift rotating member is provided with a transmission part. The annular groove and the central shaft can rotate relative to each other, allowing the gear shift rotating member to rotate relative to the gear shift fixing member. The transmission part at the lower end of the gear shift rotating member is used to drive the gear shift adjuster inside the hub to rotate.

[0021] In order to reduce the friction between the rotating part and the fixed part when the transmission rotates, a bearing is provided in the annular groove. The bearing is sleeved on the outside of the central shaft and cooperates with the central shaft.

[0022] The technical solution adopted by this utility model to solve the second technical problem mentioned above is as follows: a bicycle, including a hub, a gear regulator disposed inside the hub near the hub outlet, and a manual gear selector. The gear regulator has a locking slot at its outer end, and the aforementioned manual continuously variable transmission device is engaged at the locking slot.

[0023] Compared with the prior art, the advantages of this utility model are as follows: the transmission rope is fixed to the outer wall of the speed-changing rotating component, and the transmission rope is divided into two sub-transmission ropes with the fixing mechanism as the node. The sub-transmission rope is a rope with one end free and the other end fixed. Pulling the sub-transmission rope causes the speed-changing rotating component to rotate. Since the fixed ends of the two sub-transmission ropes coincide, the sum of the rotation angles that can be achieved by pulling the two sub-transmission ropes is maximized. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the manual continuously variable transmission device in an embodiment of the present utility model;

[0025] Figure 2 for Figure 1 Cross-sectional view of a manual continuously variable transmission (CVT);

[0026] Figure 3 for Figure 1 Exploded view of a manual continuously variable transmission (CVT);

[0027] Figure 4 This is a schematic diagram of the structure of the speed-changing rotating component in an embodiment of this utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the speed-changing fixing component in an embodiment of this utility model;

[0029] Figure 6 This is a partial structural schematic diagram of the manual continuously variable transmission device in an embodiment of this utility model. Detailed Implementation

[0030] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0031] like Figures 1-6 The present invention is shown as a preferred embodiment of the manual continuously variable transmission (CVT) device. The manual CVT device is used in conjunction with the hub 100. A main shaft 101 is inserted inside the hub 100, and both ends of the main shaft 101 protrude from the hub 100. A speed regulator 102 is provided inside the hub 100 and is sleeved on the main shaft 101. The end of the speed regulator 102 near the outlet of the hub 100 is provided with a polygonal bayonet 102a on its inner peripheral wall.

[0032] The manual continuously variable transmission (CVT) includes a gear fixing component 1, a gear rotating component 2, and a transmission rope 3. The transmission rope 3 passes around the gear fixing component 1 and the gear rotating component 2. The rider manually controls the transmission rope 3, which in turn drives the gear rotating component 2 to rotate. Finally, the gear rotating component 2 drives the gear adjuster 102 inside the hub 100 to rotate, thus achieving continuously variable transmission.

[0033] Specifically, the center of the gear shift fixing component 1 is provided with a polygonal through hole 10 that runs vertically through it. The gear shift fixing component 1 is sleeved on the main shaft 101 of the hub 100 through the through hole 10. A screw 5 corresponding to the through hole 10 is provided on the main shaft 101 at the position corresponding to the through hole 10. The side wall of the gear shift fixing component 1 has a positioning hole 13 that communicates with the through hole 10. The screw (not shown in the figure) is inserted into the positioning hole 13, and then the screw abuts against the side wall of the screw 5, thereby fixing the gear shift fixing component 1 to the main shaft 101.

[0034] like Figure 5As shown, a central shaft 12 extends downward from the lower end face of the gear shift fixing member 1 along the edge of the through hole 10. The inner wall of the central shaft 12 is polygonal, and the outer wall of the central shaft 12 is annular. The edge of the gear shift fixing member 1 first extends outward along the radial direction of the gear shift fixing member 1, and then extends downward to form a protrusion 11. Two through holes 111 are formed on the protrusion 11, which are radially through the protrusion 11. There is a gap 1a between the protrusion 11 and the central shaft 12 (see...). Figure 2 ).

[0035] like Figure 4 As shown, the gear shifting rotating component 2 is located below the gear shifting fixing component 1. An annular groove 24 for accommodating the central shaft 12 is provided at the center of the gear shifting rotating component 2. The gear shifting rotating component 2 is also fitted onto the main shaft 101 of the hub 100 through this annular groove 24. A transmission part 25 with a polygonal outer wall extends downward from the lower end of the gear shifting rotating component 2. This transmission part 25 is engaged within the latch 102a of the gear shifter 102. Furthermore, a stepped surface 241 facing the main shaft 101 is provided on the inner wall of the annular groove 24. A bearing 4 is installed within the space enclosed by the central shaft 12, the annular groove 24, the lower end face of the gear shifting fixing component 1, and the stepped surface 241.

[0036] To accommodate the transmission rope 3, a clearance groove 21 is provided transversely on the outer peripheral wall of the speed-changing rotating component 2.

[0037] Alternatively, the height of the relief groove 21 can be made to match the height of the perforation 111. This prevents the transmission rope from being subjected to a vertical force within the relief groove, making the pulling process of the transmission rope 3 smoother.

[0038] To secure the transmission rope 3, a first positioning block 22 is provided on the outer peripheral wall of the transmission rotating component 2. The first positioning block 22 has a threading hole 221 for the transmission rope 3 to pass through. The threading hole 221 extends downwards from the top surface of the first positioning block 22, and then extends to the left and right sides respectively, forming a left channel 221a and a right channel 221b. The first positioning block 22 also has a left threaded hole 222a communicating with the left channel 221a and a right threaded hole 222b communicating with the right channel 221b. Two second positioning blocks 23 are provided on the outer peripheral wall of the transmission rotating component 2, located on the left and right sides of the first positioning block 22. The second positioning blocks 23 have a secondary channel 231 for the transmission rope 3 to pass through, and also have a secondary threaded hole 232 communicating with the secondary channel 231. The first positioning blocks 22 and the second positioning blocks 23 are at the same height, and the clearance groove 21 is located above the first positioning blocks 22 and the second positioning blocks 23.

[0039] like Figure 3 , 6As shown, the transmission rope 3 includes a first moving rope 31 and a second moving rope 32. The first ends of both the first moving rope 31 and the second moving rope 32 are connected to the manual speed adjuster 200 on the handlebars. The first moving rope 31 and the second moving rope 32 pass through the right through hole 111 and the left through hole 111 respectively. Then, the first moving rope 31 is wrapped around the right relief groove 21 and the second moving rope 32 is wrapped around the left relief groove 21. The first moving rope 31 and the second moving rope 32 are simultaneously inserted into the cable hole 221. Then, the first moving rope 31 enters the left channel 221a and the left auxiliary channel 231 in sequence, and the second moving rope 32 enters the right channel 221b and the right auxiliary channel 231 in sequence. In order to fix the first moving rope 31 and the second moving rope 32 to the gear shifting component 2, this application uses screws inserted into the left screw hole 222a, the right screw hole 222b and the auxiliary screw hole 232 for fixation. When the first moving rope 31 is pulled, the variable speed rotating component 2 rotates to the right about the main shaft 101; conversely, when the second moving rope 32 is pulled, the variable speed rotating component 2 rotates to the left about the main shaft 101. Furthermore, to increase the rotation angle of the variable speed rotating component 2, both the first positioning block 22 and the second positioning block 23 can be accommodated within the gap 1a between the aforementioned protrusion 11 and the central shaft 12.

[0040] When assembling the manual continuously variable transmission (CVT), the bearing 4 is placed in the annular groove 24 of the transmission rotating component 2, and the central shaft 12 of the transmission fixing component 1 is inserted into the annular groove 24 of the transmission rotating component 2. Next, the first moving rope 31 and the second moving rope 32 are passed through the through hole 111 on the transmission fixing component 1. Then, the first moving rope 31 and the second moving rope 32 are wound around the relief groove 21 in the manner described above. Then, the first moving rope 31 and the second moving rope 32 pass through the wire hole 221 and enter the first positioning block 22 and the second positioning block 23, and are fixed with screws. Then, the transmission fixing component 1 and the transmission rotating component 2 are sleeved together on the main shaft 101 so that the transmission part 25 is engaged with the bayonet 102a. The screws are inserted into the positioning hole 13, thereby fixing the transmission fixing component 1 to the main shaft 101.

[0041] The rider manually turns the manual speed adjuster 200 on the handlebars, which pulls the first moving rope 31 or the second moving rope 32, thereby driving the gear shifting component 2 to rotate. Finally, the gear shifting component 2 drives the gear adjuster 102 inside the hub 100 to rotate, achieving stepless gear shifting.

[0042] This application also discloses a bicycle, including a hub 100, a gear regulator 102 disposed inside the hub 100 and near the outlet of the hub 100, and a manual speed regulator 200. The outer end of the gear regulator 102 is provided with a latch 102a, and the aforementioned manual continuously variable transmission device is engaged at the latch 102a.

Claims

1. A manual continuously variable transmission characterized by comprising: The application relates to a variable-speed fixing member (1) which is arranged to be sleeved on a main shaft (101) of a hub (100) and fixed to the main shaft (101), wherein a through hole (111) is arranged on the variable-speed fixing member (1); a variable-speed rotating member (2) is arranged below the variable-speed fixing member (1), the variable-speed rotating member (2) is sleeved on the main shaft (101) of the hub (100) and can rotate around the main shaft (101); a transmission rope (3) is arranged on the outer side wall of the variable-speed rotating member (2) in a circumferential direction of the outer peripheral wall of the variable-speed rotating member (2), a fixing mechanism for fixing the transmission rope (3) to the outer side wall of the variable-speed rotating member (2) is arranged on the variable-speed rotating member (2), and the two ends of the transmission rope (3) are both arranged to pass through the through hole (111) of the variable-speed fixing member (1) to the outside of the variable-speed fixing member (1); wherein the variable-speed rotating member (2) rotates around the main shaft (101) in the state that any one end of the transmission rope (3) is pulled. The outer peripheral wall of the variable-speed rotating member (2) is provided with a recess (21) arranged in a circumferential direction of the variable-speed rotating member, and the transmission rope (3) is arranged in the recess (21) in a surrounding manner. The variable-speed fixing member (1) is provided with a protrusion (11) which is formed by extending radially outward from the edge of the variable-speed fixing member (1) and then extending downward, the through hole (111) is arranged on the protrusion (11) and penetrates the protrusion (11) in a radial direction of the variable-speed fixing member (1), and the through hole (111) corresponds to the position of the recess (21). The fixing mechanism comprises a first positioning block (22) arranged on the outer peripheral wall of the variable-speed rotating member (2), the first positioning block (22) is provided with a threading hole (221) through which the transmission rope (3) passes, and the first positioning block (22) is further provided with a screw hole (222) which communicates with the threading hole (221), and the transmission rope (3) is fixed in the threading hole (221) by means of a screw which passes through the screw hole (222).

2. The manual continuously variable transmission according to claim 1, characterized by: The transmission rope (3) comprises a first transmission rope (31) and a second transmission rope (32), and the first end of the first transmission rope (31) and the first end of the second transmission rope (32) are both arranged to pass through the through hole (111).

3. The manual continuously variable transmission according to claim 2, characterized in that: The threading hole (221) extends downward from the top surface of the first positioning block (22), and then extends to left and right to form a left hole (221a) and a right hole (221b), respectively; the second end of the first transmission rope (31) is fixed in the left hole (221a), and the second end of the second transmission rope (32) is fixed in the right hole (221b).

4. The manual continuously variable transmission according to any one of claims 1 to 3, characterized in that: The first positioning block (22) is provided with a left screw hole (222a) which communicates with the left hole (221a), the second end of the first transmission rope (31) is fixed in the left hole (221a) by means of a screw which passes through the left screw hole (222a); and the first positioning block (22) is further provided with a right screw hole (222b) which communicates with the right hole (221b), the second end of the second transmission rope (32) is fixed in the right hole (221b) by means of a screw which passes through the right screw hole (222b).

5. A manual continuously variable transmission according to claim 4, characterized in that: ​ ​ 6. The manual continuously variable transmission according to claim 5, characterized in that: ​ ​ ​ 7. A manual continuously variable transmission according to claim 6, characterized in that: The fixing mechanism further comprises a second positioning block (23) on the left side of the first positioning block (22) and another second positioning block (23) on the right side of the first positioning block (22), the second end of the first moving rope (31) is fixed in the second positioning block (23) on the left side of the first positioning block (22) and the second end of the second moving rope (32) is fixed in the second positioning block (23) on the right side of the first positioning block (22).

8. The manual continuously variable transmission according to claim 1, characterized by: The lower surface of the variable speed fixing part (1) extends downward to form a central shaft (12), the center of the variable speed rotating part (2) is provided with an annular groove (24) for accommodating the central shaft (12), and the lower end of the variable speed rotating part (2) is provided with a transmission part (25).

9. A manual continuously variable transmission according to claim 8, characterized in that: The annular groove (24) is provided with a bearing (4) which is sleeved on the outside of the central shaft (12) and cooperates with the central shaft (12).

10. Bicycle comprising a hub (100), a derailleur (102) arranged inside the hub (100) and close to the outlet of the hub (100), and a hand speed regulator (200), characterized in that: The variable speed regulator (102) is provided with a bayonet (102a) at the outer end, and the bayonet (102a) is clamped with the manual type continuously variable transmission device as claimed in any one of claims 1-9.

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