A carbon fibre bicycle

Abstract

The application discloses a carbon fiber bicycle and belongs to the field of carbon fiber bicycle structures, which comprises a frame, the frame comprises a front pipe, an upper pipe, a sleeve pipe and a lower pipe which are sequentially connected, a handle is installed on the upper part of the front pipe, a front fork is installed on the bottom of the front pipe, and a rear fork is installed on the rear part of the sleeve pipe; the front fork comprises two front fork pipes, the rear fork comprises two upper fork pipes and two lower fork pipes; the application further comprises a seat pipe column, the bottom of the seat pipe column is located in the sleeve pipe; the application further comprises a metal cylinder shaft, a carbon sheet is arranged at one end of the metal cylinder shaft, the surface of the carbon sheet is flush with the surfaces of the front fork pipes and the lower fork pipes respectively; the application further comprises a brake device, a speed change line and a brake line, one end of the brake line and the speed change line is led out through the inside of the handle, and the other end of the brake line is led out after passing through the inside of the frame. The carbon fiber bicycle disclosed by the application hides one end of the metal cylinder shaft in the lower fork pipe, and the end is closed through the carbon sheet, so that scratches are avoided between the metal cylinder shaft and the surface of the carbon fiber frame, and the smoothness and beauty of the surface of the carbon fiber frame are affected.

Description

Technical Field

[0001] This invention relates to the field of bicycle structure, and in particular to a carbon fiber bicycle. Background Technology

[0002] Carbon fiber, as an emerging material, is widely used in people's lives, such as in carbon fiber bicycles. Carbon fiber structures are mainly distributed in bicycle frames, front forks, rear forks, and wheelsets, possessing advantages such as lightweight, high rigidity, and good shock absorption, as illustrated by a carbon fiber frame disclosed in Chinese Patent Publication No. CN216468258U. A thru-axle is installed between the front and rear forks of the carbon fiber frame. To ensure structural strength, the thru-axle is currently made of metal. During the installation of the metal thru-axle onto the carbon fiber frame, because one end of the metal thru-axle needs to be flush with the surface of the front or rear fork, scratches are left on the surfaces of the front and rear forks during installation. Summary of the Invention

[0003] The present invention provides a carbon fiber bicycle, the purpose of which is to solve the problem mentioned in the background art of leaving marks on the front and rear forks of the carbon fiber frame during the installation of metal thru-axles.

[0004] To achieve the above objectives, the present invention adopts the following solution:

[0005] This invention provides a carbon fiber bicycle, including a frame comprising a front tube, a top tube, a sleeve, and a down tube connected sequentially; a handlebar is mounted on the upper part of the front tube, a front fork is mounted on the bottom of the front tube, and a rear fork is mounted on the rear of the sleeve; the front fork includes two fork tubes, and the rear fork includes two top fork tubes and two bottom fork tubes; a seatpost is also included, the bottom of which is located inside the sleeve; a thru-axle is also included, disposed between two of the front fork tubes and / or two of the bottom fork tubes; the thru-axle... One end of the frame is provided with a carbon fiber strip, the surface of which is flush with the surfaces of the front fork tube and the rear fork tube, respectively; it also includes a braking device, which includes a first brake and / or a second brake; it also includes a shift cable and a brake cable, one end of which passes through the interior of the front of the frame and exits through the interior of the frame and is connected to the first brake and / or the second brake; the other end of which passes through the interior of the frame and extends out of the sleeve and the rear fork, respectively.

[0006] Optionally, the lower fork tube is provided with a second mounting hole, and a tightening member is provided in the second mounting hole. The tightening member has a through hole in the center and a thread on its inner surface. One end of the metal cylinder shaft has a thread on its outer surface, and the metal cylinder shaft is connected to the tightening member by the thread. The other end of the metal cylinder shaft is provided with a screw, and the end of the screw is engaged in the second mounting hole.

[0007] Optionally, the carbon fiber includes a first carbon fiber and a second carbon fiber; a first mounting hole is provided at the bottom of the fork tube, and a first carbon fiber is provided at one end of one of the first mounting holes; one end surface of the tightening member is spaced from the surface of the lower fork tube, and the second carbon fiber is located between the tightening member and the lower fork tube; the surface of the second carbon fiber is in contact with the surface of the tightening member, and the edge of the second carbon fiber is in contact with the surface of the second mounting hole.

[0008] Optionally, the battery is located inside the sleeve, and a clamping part is provided between the sleeve and the battery; the clamping part includes a first fixing block, a second fixing block, and a clamping block between them, the first fixing block and the second fixing block being fixed to the sleeve wall; threaded round holes are provided through the corresponding positions of the first fixing block and the second fixing block, and threaded slots are provided through the clamping block; the clamping part also includes a screw, and the clamping block moves laterally as the screw is screwed into or out of the threaded round hole and the threaded slot in sequence.

[0009] Optionally, the bottom surface of the first fixing block is divided into a flat segment and a first inclined segment, the upper surface of the clamping block is an inclined surface, and the first inclined segment is always in close contact with the upper surface of the clamping block during the lateral movement of the clamping block; the top surface of the first fixing block is a flat surface; the top surface of the second fixing block is divided into the flat segment and the first inclined segment, the lower surface of the clamping block is an inclined surface, and the first inclined segment is always in close contact with the lower surface of the clamping block during the lateral movement of the clamping block; the bottom surface of the second fixing block is a flat surface.

[0010] Optionally, the battery is mounted inside the lower tube via a bracket; the bottom of the lower tube is provided with multiple mounting holes, and the bottom of the bracket is provided with multiple protrusions, the protrusions being fixedly connected to the mounting holes; the battery is fixed to the bracket.

[0011] Optionally, a bottom hole is provided at the bottom of the connection between the lower tube, the rear fork, and the sleeve, and the battery and the bracket are placed in the lower tube through the bottom hole; a central shaft sleeve hole is provided through both sides of the connection between the lower tube, the rear fork, and the sleeve.

[0012] Optionally, a first tightening structure is provided between the seat post and the sleeve. The tightening structure includes a first embedded part, a second embedded part, a first tightening block, and a first tightening screw. The first and second embedded parts are embedded in the upper tube, and the first embedded part is located at the connection between the upper tube and the sleeve. The end of the first embedded part is provided with an installation groove, and one side of the installation groove is open. The first tightening block is installed in the installation groove along the opening. A connecting groove is provided on the other side of the installation groove. The second embedded part is provided with a threaded through hole, and the inner surface of the threaded through hole is provided with threads. One end of the threaded through hole communicates with the connecting groove. The first tightening screw is threadedly connected to the second embedded part. The first tightening screw is screwed into the second embedded part and contacts the first tightening block. The first tightening block tightens the seat post into the sleeve.

[0013] Optionally, the surface of the first clamping block that contacts the seat post is an arc-shaped surface, and the arc-shaped surface is provided with concave grooves for improving friction; the surface of the first clamping block that contacts the first clamping screw is a flat surface.

[0014] Optionally, a filler block is provided on one side of the seatpost; a second clamping structure is provided between the seatpost and the sleeve, the second clamping structure is disposed within the frame, the second clamping structure includes a second clamping block, the second clamping block is disposed within the filler block, one side of the second clamping block contacts the seatpost; a threaded hole is provided in the filler block on the other side of the second clamping block; the clamping structure further includes a second clamping screw, the second clamping screw is screwed into the threaded hole to press the second clamping block.

[0015] Optionally, the threaded hole extends into the second clamping block, and the second clamping screw is screwed into the second clamping block; or a third clamping screw is provided inside the second clamping block, the end face of the third clamping screw is flush with the surface of the second clamping block, and the second clamping screw contacts the third clamping screw.

[0016] Compared with existing technologies, the present invention has the following advantages:

[0017] 1. For carbon fiber frames and metal thru-axles, one end of the metal thru-axle is placed inside the fork tube and / or the chainstay tube. The end of the metal thru-axle is equipped with a carbon fiber plate to avoid scratching the surface of the fork and rear fork during installation, thus making the surface of the carbon fiber frame smooth and beautiful.

[0018] 2. The brake and gear cables are installed inside the bicycle frame, which reduces the aging caused by external environmental factors and extends the lifespan of the bicycle's braking and shifting systems. In addition, internal installation makes wiring the brake and gear cables easier and eliminates the need to consider the impact on other bicycle parts.

[0019] 3. The seatpost and the sleeve are secured by a clamping structure, which prevents the seatpost from moving inside the sleeve and keeps the bicycle seat stable during riding. The clamping structure is hidden inside the frame, which can avoid the influence of the external environment and ensure the long-term use of the clamping structure.

[0020] 4. The battery is housed inside the frame, reducing the impact of the external environment on the battery; at the same time, the wiring of the battery installed inside the frame can be routed from inside the frame, solving the wiring problem when the battery is installed outside the frame. Attached Figure Description

[0021] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a schematic diagram of the overall structure of a bicycle provided in an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 Front view of the bicycle.

[0024] Figure 3 yes Figure 2 A schematic diagram of the internal structure of a bicycle.

[0025] Figure 4 This is the front view of the chassis.

[0026] Figure 5 yes Figure 4 Enlarged view of section A.

[0027] Figure 6 This is a schematic diagram of the clamping part structure.

[0028] Figure 7 yes Figure 6 Front view of the centrally compressed part.

[0029] Figure 8 yes Figure 6 Top view of the centrally compressed section.

[0030] Figure 9 yes Figure 8 Sectional view of AA.

[0031] Figure 10 This is a schematic diagram of the clamping block structure.

[0032] Figure 11 This is a schematic diagram of the first fixed block structure.

[0033] Figure 12 This is a schematic diagram of the downtube structure of the frame.

[0034] Figure 13 yes Figure 12 Bottom view of the lower middle tube.

[0035] Figure 14 yes Figure 13 Sectional view of the middle BB section.

[0036] Figure 15 yes Figure 14 Enlarged view of section B in the middle.

[0037] Figure 16 This is a schematic diagram of the battery and bracket assembly structure.

[0038] Figure 17 This is a schematic diagram showing the installation position of the first clamping structure and the frame.

[0039] Figure 18 This is a schematic diagram of the first clamping structure.

[0040] Figure 19 This is an exploded view of the first clamping structure.

[0041] Figure 20 This is a schematic diagram of the installation of the bushing and sleeve.

[0042] Figure 21 yes Figure 20 A schematic diagram of the internal structure.

[0043] Figure 22 yes Figure 21 Enlarged view of section C.

[0044] Figure 23 This is a schematic diagram of the second clamping structure.

[0045] Figure 24 This is a schematic diagram of the second clamping block.

[0046] Figure 25 This is a first-person perspective view of the chassis.

[0047] Figure 26 yes Figure 25 Enlarged view of section D in the middle.

[0048] Figure 27 yes Figure 25 Enlarged view of section E in the middle.

[0049] Figure 28 This is a two-dimensional view of the chassis from a second perspective.

[0050] Figure 29 yes Figure 28 Enlarged view of section F in the middle.

[0051] Figure 30 yes Figure 25 The front view of the chassis.

[0052] Figure 31 yes Figure 30 Enlarged view of section G in the middle.

[0053] Figure 32 yes Figure 31 DD section view.

[0054] Explanation of key component symbols:

[0055] 1. Frame; 11. Front tube; 12. Top tube; 13. Sleeve; 14. Down tube; 141. Borehole; 142. Borehole; 15. Front fork; 151. Fork tube; 152. First mounting hole; 153. First carbon fiber disc; 16. Rear fork; 161. Upper fork tube; 162. Lower fork tube; 163. Second carbon fiber disc; 164. Retaining screw; 165. Second mounting hole; 166. Tightening fitting; 17. Metal thru-axle;

[0056] 2. Locomotive;

[0057] 3. Braking device; 31. First brake; 32. Second brake; 33. Brake cable;

[0058] 4. Gear change cable;

[0059] 5. Seat tube column; 51. First tightening structure; 511. First embedded part; 512. First tightening block; 513. Second embedded part; 514. First tightening screw; 515. Corrugated thread; 52. Second tightening structure; 521. Second tightening block; 522. Filler block; 523. Second tightening screw; 524. Third tightening screw;

[0060] 6. Battery; 61. Clamping part; 611. First fixing block; 612. Second fixing block; 613. Clamping block; 62. Bracket; 621. Protrusion. Detailed Implementation

[0061] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0062] Example 1

[0063] Refer to the accompanying drawings in the instruction manual, such as Figures 1-4 As shown, this application proposes a carbon fiber bicycle;

[0064] The bicycle includes a frame 1, which comprises a front tube 11, a top tube 12, a sleeve 13, and a down tube 14. A front fork 15 is mounted at the bottom of the front tube 11, and a rear fork 16 is mounted at the rear of the sleeve 13. The front wheel and rear wheel of the bicycle are mounted on the front fork 15 and the rear fork 16, respectively. The front fork 15 includes two fork tubes 151, the top ends of which are connected, making the front fork 15 U-shaped. The rear fork 16 includes two upper fork tubes 161 and two lower fork tubes 162. The upper fork tubes 161 and lower fork tubes 162 on the same side form a triangle with the frame 1, with a first included angle between the two upper fork tubes 161 and a second included angle between the two lower fork tubes 162. Bottom bracket holes 142 are provided on both sides of the connection between the down tube 14, the rear fork 16, and the sleeve 13, through which the axle for connecting the bicycle pedals passes.

[0065] The bicycle also includes a braking device 3, which includes a first brake 31 and a second brake 32. The first brake 31 and the second brake 32 are located at the front fork 15 and the rear fork 16 of the frame, respectively. The first brake 31 and the second brake 32 can act on the bicycle wheel or disc brake by means of wheel brake or disc brake.

[0066] The bicycle also includes a handlebar 2, which is mounted on the front tube 11. Left and right brake levers and shifters are respectively installed on the left and right sides of the handlebar 2. The left and right brake levers are connected to the first brake 31 and the second brake 32 respectively via brake cables 33; when laying the brake cables 33, one end of the brake cables 33 is located inside the handlebar 2, and the other end passes through the inside of the frame 1 and connects to the first brake 31 and the second brake 32.

[0067] In addition, the bicycle also includes two gear cables 4. One end of the gear cable 4 is located inside the front 2 on both sides, and the other end passes through the inside of the frame 1 and extends out of the sleeve 13 and the rear fork 16 respectively. The gear cables extending out of the sleeve 13 and the rear fork 16 are connected to the bicycle's derailleur.

[0068] In summary, by placing the brake cable 33 and the gear cable 4 inside the frame 1, the aging of the brake cable 33 and the gear cable 4 due to the influence of the external environment can be reduced, thus improving the service life of the bicycle's braking and shifting systems. In addition, the internal placement of the brake cable 33 and the gear cable 4 makes wiring more convenient, without having to consider the impact on other parts of the bicycle. For example, the brake cable 33 of a traditional bicycle is located outside the frame 1, and during installation, it is necessary to avoid tangling with the front wheel.

[0069] like Figures 4-11 As shown, a battery 6 is also installed inside the bicycle frame 1, which drives or assists in driving the bicycle.

[0070] The battery 6 can be housed within the sleeve 13 of the bicycle. A clamping part 61 is provided between the sleeve 13 and the battery 6 to secure the battery 6. The clamping part 61 includes, from top to bottom, a first fixing block 611, a clamping block 613, and a second fixing block 612. The right sides of the first fixing block 611 and the second fixing block 612 are fixed to the sleeve 13, and the left side of the clamping block 613 is close to the battery 6. Threaded round holes are provided on the top and bottom of the first fixing block 611 and the second fixing block 612, and a threaded slot is provided on the clamping block 613. The clamping part 61 also includes a screw. The upper and lower surfaces of the clamping block 613 are both beveled, and the thickness of the clamping block 613 gradually decreases from left to right. When the screw is screwed into the second fixing block 612, the clamping block 613, and the first fixing block 611 from bottom to top, the clamping block 613 moves to the left to tighten the battery 6. Furthermore, when the screw is not inserted, the position of the threaded hole can correspond to the edge of the threaded slot to ensure that the clamping block 613 has sufficient clamping stroke. In order to cooperate with the clamping block 613 in clamping and also reduce the length of the screw, the surfaces of the first fixing block 611 and the second fixing block 612 that contact the clamping block 613 include a flat section and a first inclined section. During the movement of the clamping block 613, the first inclined section is always in close contact with the surface of the clamping block 613, thereby reducing the overall thickness of the clamping part 61, and thus the required screw length will be shortened.

[0071] Furthermore, the top surface of the first fixing block 611 and the bottom surface of the second fixing block 612 are flat surfaces. The surface of the clamping block 613 near the battery can be flat or curved, so that the clamping block 613 and the battery 6 have line contact or surface contact. The screw can be divided into a threaded section and a smooth section, with the smooth section located at the bottom of the threaded section.

[0072] like Figure 17-19 As shown, the bicycle also includes a seatpost 5, the bottom of which is located inside the sleeve 13, and the seatpost 5 is pressed tightly against the sleeve 13. The specific structure is as follows:

[0073] The first embedded part 511 and the second embedded part 512 are embedded in the upper pipe 12. The first embedded part 511 is located at the connection between the upper pipe 12 and the sleeve 13. The first embedded part 511 is made of carbon shell, i.e., carbon fiber material, and has an installation groove at its end, with one side of the installation groove open. The first clamping block 512 is inserted from the sleeve 13 and installed in the installation groove along the opening. A connecting groove is provided on the other side of the installation groove.

[0074] The second embedded part 512 is made of metal material. A threaded through hole is provided in the second embedded part 512. The inner surface of the threaded through hole is provided with threads. One end of the threaded through hole is connected to the connecting groove.

[0075] The first clamping block 512 is made of metal. The surface of the first clamping block 512 that contacts the seat post 5 is an arc-shaped surface. Since the seat post 5 is cylindrical, the arc-shaped contact increases the contact area. The arc-shaped surface has grooves 515 to improve friction. The first clamping screw 514 is threaded into the second embedded part 513, and the first clamping screw 514 screws into the second embedded part 513 to contact the first clamping block 512. The surface of the first clamping block 512 that contacts the first clamping screw 514 is a flat surface.

[0076] The first embedded part 511 and the second embedded part 512 are inclined upwards along the screwing direction of the first tightening screw 514, so that the screwing end of the threaded through hole is located below the upper tube 12, which can prevent the threaded through hole from being exposed upwards. In order to further enhance the aesthetics and improve the waterproof and dustproof function, a first rubber plug and a second rubber plug can also be provided. The first rubber plug is installed at the end of the threaded through hole and is located outside the first tightening screw 514; the second rubber plug is installed above the sleeve 13.

[0077] In addition, such as Figures 25-32 As shown, the bicycle also includes a metal thru-axle 17. For the carbon fiber frame 1, the metal thru-axle 17 is connected to the carbon fiber frame 1 in the following manner;

[0078] The metal thimble shaft 17 is disposed between the two fork tubes 151 and / or the two lower fork tubes 162, that is, it can be disposed at least once in either the fork 15 or the rear fork 16. A first mounting hole 152 is provided at the bottom of each of the two fork tubes 151, and a second mounting hole 165 is provided on each of the two lower fork tubes 162. A first carbon blade 153 and a second carbon blade 163 are respectively disposed in one of the first mounting holes 152 and 165. The surface of the first carbon blade 153 is flush with the surface of the fork tube 151, and the second carbon blade 163 is flush with the surface of the lower fork tube 162. Taking the metal thimble shaft 17 mounted on the lower fork tube 16 as an example, a tightening member 166 is pre-embedded in the lower fork tube 16. The tightening member 166 has a through hole in its center, and threads are provided on the surface of the through hole. Threads are also provided at the end of the metal thimble shaft 17. During installation, the metal cylinder shaft 17 is threaded and rotated into the lower fork tube 162, connecting one side of the lower fork tube 162 to the metal cylinder shaft 17. A gap is left between the tightening member 166 and the second mounting hole 165 on the lower fork tube 162, the gap being approximately equal to the thickness of the second carbon sheet 163. After the metal cylinder shaft 17 passes through the second mounting hole 165 and connects with the tightening member 166, the second carbon sheet 163 is inserted into the gap between the second mounting hole 165 and the tightening member 166, so that both sides of the surface of the second carbon sheet 163 are flush with the surface of the lower fork tube 162 and fit against the side of the tightening member 166. The edge of the second carbon sheet 163 fits against the inner surface of the second mounting hole 165, thus concealing one end of the metal cylinder shaft 17 within the lower fork tube 162. Furthermore, to ensure a tight fit between the second carbon sheet 163 and the second mounting hole 165, an interference fit can be used. After the second carbon strip 163 is installed, the surface of the second carbon strip 163 can be sanded to adjust the flatness of the surface of the lower fork tube 162.

[0079] The other end of the metal cylinder shaft 17 passes through the second mounting hole 165 on the lower fork tube 162. The end of the metal cylinder shaft 17 is locked by a fixing screw 164, the end of which is engaged in the second mounting hole 165. At this time, one end of the metal cylinder shaft 17 passes through the lower fork tube 162 on one side and is hidden inside the lower fork tube 162, and is then sealed by a carbon sheet; the other end is locked to the lower fork tube 162 on the other side by the fixing screw 164, forming a structure in which one end of the metal cylinder shaft 17 is hidden.

[0080] During actual testing and production, staff discovered that if both ends of the metal cylinder shaft 17 were concealed within the lower fork tube 162, both ends of the metal cylinder shaft 17 would need to be threadedly connected to the pre-installed tightening member 166 within the lower fork tube 162. This made installation of the metal cylinder shaft 17 difficult. Therefore, instead of concealing both ends of the metal cylinder shaft 17 within the lower fork tube, only one end is concealed within the lower fork tube 162, while the other end is secured to the lower fork tube 162 with a screw. Based on this structure, when installing the metal cylinder shaft 17, one end extends into one side of the lower fork tube 162 and is secured to that side with a screw; then it rotates and extends into the other side of the lower fork tube 162, threadedly connecting to the tightening member 166. A second carbon plate 163 is installed at the end for sealing, completing the installation of the metal cylinder shaft 17.

[0081] The above describes only the process of installing the metal thimble 17 on the lower fork tube 162. When the metal thimble 17 is installed on the front fork tube 151, the interior of the front fork tube 151 and the interior of the lower fork tube 162 adopt the same structure, and the installation process is the same.

[0082] Example 2

[0083] Refer to the accompanying drawings in the instruction manual, such as Figures 12-16 As shown, this application discloses a carbon fiber bicycle in which the battery 6 can be fixed inside the downtube 14 by a bracket 62. Specifically, a bracket 62 is provided at the bottom of the battery 6. The battery 6 is cylindrical in shape, and the surface of the bracket 62 that contacts the battery 6 is an arc-shaped surface. The curvature of the arc-shaped surface is similar to that of the surface curvature of the battery 6, so that there is a large contact area between the battery 6 and the bracket 62, making the battery 6 more stable when mounted on the bracket 62. The battery 6 and the bracket 62 can be fixed by binding with straps or by gluing.

[0084] The bottom of the bracket 62 is provided with multiple protrusions 621. The bracket 62 and the protrusions 621 are integrally formed. Correspondingly, multiple mounting holes are also provided on the bottom surface of the lower tube 14 at the positions of the protrusions 621. The protrusions 621 are fixedly connected to the mounting holes to achieve the purpose of fixing the bracket 62 to the lower tube.

[0085] The protrusion 621 can be fixed by engaging with the mounting hole. The specific structure is as follows: the bottom of the protrusion 621 has an interference fit with the mounting hole. The material of the protrusion 621 can be rubber. When installing the bracket 62, the bottom of the protrusion 621 is inserted into the mounting hole and extends beyond it, thus fixing the bracket. The bottom surface of the protrusion 621 can be curved, making it easier to insert the protrusion 621 into the mounting hole.

[0086] In addition, the protrusion 621 can also be connected to the mounting hole by a thread, with the following structure: the screw passes through the mounting hole from the bottom and extends into the protrusion 621. The protrusion 621 can be made of metal and has a threaded hole inside. When the screw is screwed into the protrusion, the bracket is fixed.

[0087] A bottom hole 141 is provided at the bottom of the connection between the lower tube 14, the rear fork 16, and the sleeve 13. The battery 6 and the bracket 62 are placed in the lower tube 14 through the bottom hole 141. After the battery 6 and the bracket 62 are installed, the bottom hole 141 can be closed by a cover plate.

[0088] Example 3

[0089] Refer to the accompanying drawings in the instruction manual, such as Figures 20-24 As shown, in this application, a carbon fiber bicycle is provided in which the seatpost 5 can also be pressed against the sleeve 13 in such a way.

[0090] A filler block 522 is installed inside the top tube 12, and the filler block 522 can completely fill the top tube 12. In addition, in order to save materials and reduce the weight of the frame, a accommodating space can be enclosed by a baffle on the side of the top tube 12 near the sleeve 13, and the filler block 522 fills the accommodating space. A sleeve cap is fitted on the seatpost 5, and the sleeve cap can move up and down along the seatpost. The sleeve cap is set on the sleeve, and the length of the sleeve cap is greater than the length of the filler block.

[0091] The second tightening structure 52 is disposed at the connection between the sleeve 13 and the upper tube 12. The second tightening structure 52 includes a second tightening block 521, which is disposed within the filler block 522. The left side surface of the second tightening block 521 contacts the seat tube post 5, and the remaining surfaces of the second tightening block 521 contact the filler block 522 but do not apply force. A threaded hole is obliquely disposed within the filler block 522 of the second tightening block 521, with the threaded hole inclined from right to left. A second tightening screw 523 is screwed into the threaded hole to tighten the second tightening block 521 against the seat tube post 5.

[0092] The threaded hole can extend into the second clamping block 521, at which point the second clamping screw 523 is screwed into the second clamping block 521. Furthermore, a third clamping screw 524 can also be provided inside the second clamping block 521. The surface of the third clamping screw 524 is flush with the surface of the second clamping block 521, and the second clamping screw 523 contacts the third clamping screw 524, at which point the second clamping screw 523 is located outside the second clamping block 521. The second clamping block 521 is clamped using these two methods, and the third clamping screw 524 prevents the second clamping screw 523 from stripping when screwed into the second clamping block 521.

[0093] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A carbon fiber bicycle, characterized in that, include: A frame, comprising a front tube, a top tube, a sleeve, and a down tube connected in sequence; the front tube has a headstock mounted on its upper part, a front fork mounted on its bottom part, and a rear fork mounted on its rear part; the front fork has two fork tubes, and the rear fork has two top fork tubes and two bottom fork tubes. A seat post, the bottom of which is located inside the sleeve; A metal spool shaft is disposed between two front fork tubes and two lower fork tubes. One end of the metal spool shaft is provided with a carbon blade, which includes a first carbon blade and a second carbon blade. A first mounting hole is provided at the bottom of each of the two front fork tubes, and a second mounting hole is provided on each of the two lower fork tubes. A tightening member is disposed within the first and second mounting holes. The tightening member has a through hole in the center and a thread on its inner surface. One end of the metal spool shaft has a thread on its outer surface, and the metal spool shaft is connected to the tightening member via a threaded connection. One end surface of the tightening member installed inside the fork tube is spaced from the surface of the fork tube. The first carbon sheet is inserted into the gap so that the first carbon sheet is interference-fitted with the first mounting hole. After the first carbon sheet is installed, the surface of the first carbon sheet is sanded so that the surface of the first carbon sheet is flush with the surface of the fork tube. One end surface of the tightening member installed in the lower fork tube is spaced from the surface of the lower fork tube. The second carbon sheet is inserted into the space so that the second carbon sheet is interference-fitted with the second mounting hole. After the second carbon sheet is installed, the surface of the second carbon sheet is sanded so that the surface of the second carbon sheet is flush with the surface of the lower fork tube. A braking device, the braking device comprising a first brake and / or a second brake; The gear cable and brake cable have one end passing through the inside of the front of the vehicle and the other end passing through the inside of the frame and connecting to the first brake and / or the second brake; the other end of the gear cable passes through the inside of the frame and extends out of the sleeve and the rear fork respectively.

2. A carbon fiber bicycle according to claim 1, characterized in that: The other end of the metal cylinder shaft is provided with a fixing screw. The end of the fixing screw of the metal cylinder shaft installed on the front fork tube is engaged in the first mounting hole; the end of the fixing screw of the metal cylinder shaft installed on the lower fork tube is engaged in the second mounting hole.

3. A carbon fiber bicycle according to claim 1, characterized in that: It also includes a battery, which is disposed inside the vehicle frame; The battery is located inside the sleeve, and a clamping part is provided between the sleeve and the battery; The clamping part includes a first fixing block, a second fixing block, and a clamping block between them. The first fixing block and the second fixing block are fixed to the sleeve wall. Threaded round holes are provided through the corresponding positions of the first fixing block and the second fixing block. Threaded slots are provided through the clamping block. The clamping part also includes screws. As the screws are screwed into or out of the threaded round holes and the threaded slots in sequence, the clamping block moves laterally.

4. A carbon fiber bicycle according to claim 3, characterized in that: The bottom surface of the first fixing block is divided into a flat section and a first inclined section. The upper surface of the clamping block is an inclined surface. During the lateral movement of the clamping block, the first inclined section is always in close contact with the upper surface of the clamping block. The top surface of the first fixing block is a flat surface. The top surface of the second fixing block is divided into a flat section and a first inclined section. The lower surface of the clamping block is an inclined surface. During the lateral movement of the clamping block, the first inclined section is always in close contact with the lower surface of the clamping block. The bottom surface of the second fixing block is a flat surface.

5. A carbon fiber bicycle according to claim 3, characterized in that: The battery is mounted inside the lower tube via a bracket; The bottom of the lower tube is provided with multiple mounting holes, and the bottom of the bracket is provided with multiple protrusions, which are fixedly connected to the mounting holes; the battery is fixed to the bracket.

6. A carbon fiber bicycle according to claim 5, characterized in that: The bottom of the connection between the lower tube, the rear fork, and the sleeve is provided with a bottom hole, and the battery and the bracket are placed inside the lower tube through the bottom hole; The lower tube, the rear fork, and the sleeve connection are provided with central shaft sleeve holes on both sides.

7. A carbon fiber bicycle according to claim 1, characterized in that: A first tightening structure is provided between the seat post and the sleeve. The tightening structure includes a first embedded part, a second embedded part, a first tightening block, and a first tightening screw. The first and second embedded parts are embedded in the upper tube, and the first embedded part is located at the connection between the upper tube and the sleeve. The end of the first embedded part is provided with an installation groove, and one side of the installation groove is open. The first tightening block is installed in the installation groove along the opening. A connecting groove is provided on the other side of the installation groove. The second embedded part is provided with a threaded through hole, and the inner surface of the threaded through hole is provided with threads. One end of the threaded through hole communicates with the connecting groove. The first tightening screw is threadedly connected to the second embedded part. The first tightening screw is screwed into the second embedded part and contacts the first tightening block. The first tightening block tightens the seat post into the sleeve.

8. A carbon fiber bicycle according to claim 7, characterized in that: The surface of the first clamping block that contacts the seat post is an arc-shaped surface, and the arc-shaped surface is provided with concave grooves to improve friction; the surface of the first clamping block that contacts the first clamping screw is a flat surface.

9. A carbon fiber bicycle according to claim 1, characterized in that: A filling block is provided on one side of the seat tube column; A second clamping structure is provided between the seat post and the sleeve. The second clamping structure is disposed within the frame. The second clamping structure includes a second clamping block, which is disposed within the filler block. One side of the second clamping block contacts the seat post. A threaded hole is provided in the filler block on the other side of the second clamping block. The tightening structure also includes a second tightening screw, which is screwed into the threaded hole to press the second tightening block.

10. A carbon fiber bicycle according to claim 9, characterized in that: The threaded hole extends into the second clamping block, and the second clamping screw is screwed into the second clamping block; Alternatively, a third tightening screw may be provided inside the second tightening block, with the end face of the third tightening screw flush with the surface of the second tightening block, and the second tightening screw contacting the third tightening screw.

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