A road bike suspension fork

Abstract

This utility model relates to the field of bicycle technology and discloses a road bike suspension fork. An outer tube is fitted around the outer side of the inner tube. A fork bridge is fixedly installed on the top of the outer tube, and a mounting base is fixedly installed on the bottom side of the outer tube. A torsion cap is movably installed on the upper part of the inner wall of the inner tube via a limiting ring. A pivot tube is fixedly installed at the bottom of the torsion cap. The bottom of the pivot tube is rotatably connected to the lower part of the inner wall of the inner tube via a bearing. A spring is provided between the bottom of the inner tube and the inner bottom wall of the outer tube. The pivot tube drives the threaded sleeve to reverse, which in turn drives the threaded rod to move downwards, relaxing the spring. After the spring relaxes, the spring spacing becomes wider, the spring force increases, and the sliding distance between the inner and outer tubes becomes longer, thereby increasing the overall shock absorption of the fork. During this process, the spring force is controlled by adjusting the spring spacing, thus controlling the overall shock absorption performance of the fork.

Description

Technical Field

[0001] This utility model relates to the field of bicycle technology, specifically to a road bike suspension fork. Background Technology

[0002] The front fork is located at the front of the bicycle structure. Its upper end is connected to the handlebar assembly, the frame assembly mates with the head tube, and its lower end mates with the front axle assembly, forming the bicycle's steering system.

[0003] The front fork is a major component of a bicycle, bearing a significant portion of the load and acting as a shock absorber during riding. A typical bicycle front fork is a single-shoulder fork with a simple structure. The shock-absorbing component is a spring in one of the two sleeves, forming a rebound damping system used to absorb impact energy from the road surface. However, the energy absorbed by the spring is quickly released upon rebound, and the spring's elastic force cannot be adjusted, resulting in poor shock absorption performance. Utility Model Content

[0004] (a) Technical problems to be solved

[0005] To address the shortcomings of existing technologies, this utility model provides a road bike suspension fork with the advantage of adjustable spring force, thus solving the aforementioned problems.

[0006] (II) Technical Solution

[0007] To achieve the aforementioned purpose of adjusting spring force, this utility model provides the following technical solution: a road bike suspension fork, including a head tube, a fork shoulder fixedly installed at the bottom of the head tube, sleeves fixedly installed at both ends of the fork shoulder, an inner tube fixedly installed inside the sleeve, an outer tube fitted outside the inner tube, a fork bridge fixedly installed at the top of the outer tube, a mounting seat fixedly installed on the bottom side of the outer tube, a torsion cap movably installed above the inner wall of the inner tube via a limiting ring, a rotating shaft tube fixedly installed at the bottom of the torsion cap, the bottom of the rotating shaft tube being rotatably connected to the lower inner wall of the inner tube via a bearing, and a spring provided between the bottom of the inner tube and the inner bottom wall of the outer tube.

[0008] Preferably, a threaded sleeve is slidably installed inside the rotating shaft tube, a limiting slider is fixedly installed on the outside of the threaded sleeve, and a limiting groove corresponding to the limiting slider is opened on the inner wall of the rotating shaft tube. The threaded sleeve is slidably installed on the inner wall of the rotating shaft tube through the limiting slider and the limiting groove.

[0009] Preferably, the threaded sleeve has an internal threaded connection to a threaded rod, the top of which extends upward into the interior of the rotating shaft tube. A limit plate is fixedly installed on the top of the threaded rod, and a threaded post is fixedly installed on the bottom of the threaded rod. The threaded post is inserted downward into a reserved hole at the bottom of the outer tube.

[0010] Preferably, a fixing nut and a locking nut are threadedly connected to the outer side of the threaded column. The fixing nut is fixedly installed on the inner bottom wall of the outer tube, and the locking nut is pressed against the bottom of the outer tube. The threaded column is detachably installed on the bottom of the outer tube through the fixing nut and the locking nut.

[0011] (III) Beneficial Effects

[0012] Compared with the prior art, this utility model provides a road bike suspension fork with the following advantages:

[0013] 1. This road bike suspension fork uses a torsion nut to drive the pivot tube to rotate. The pivot tube, in turn, rotates the threaded sleeve, which drives the threaded rod upward, causing the outer tube to move upward. This passively compresses the spring, reducing the spring pitch and spring force, and shortening the sliding distance between the inner and outer tubes, thus decreasing the overall shock absorption of the fork. Conversely, the pivot tube drives the threaded sleeve to rotate in the opposite direction, which in turn drives the threaded rod downward, relaxing the spring. This relaxation increases the spring pitch and spring force, lengthening the sliding distance between the inner and outer tubes, thus increasing the overall shock absorption of the fork. The spring force is controlled by adjusting the spring pitch during this process, thereby controlling the overall shock absorption performance of the fork.

[0014] 2. The road bike suspension fork uses a threaded sleeve to drive the threaded rod to move up or down. When the bicycle bumps, the outer tube moves up, and the threaded rod and threaded sleeve also move up. The threaded sleeve slides up and down inside the pivot tube through a limiting slider and a limiting groove, thus ensuring that the threaded sleeve can both drive the threaded rod to rotate and slide up and down in the pivot tube, without affecting the expansion and contraction performance between the inner and outer tubes. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0016] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0017] Figure 3 This is a cross-sectional exploded view of the present invention;

[0018] Figure 4 This is an exploded structural diagram of the present invention;

[0019] Figure 5 This is a schematic diagram of the planar cross-section structure of this utility model.

[0020] In the diagram: 1. Head tube; 2. Fork shoulder; 3. Sleeve; 4. Inner tube; 5. Outer tube; 6. Fork bridge; 7. Mounting base; 8. Limiting ring; 9. Torque cap; 10. Rotary shaft tube; 11. Bearing; 12. Threaded sleeve; 13. Limiting slider; 14. Limiting groove; 15. Threaded rod; 16. Limiting plate; 17. Threaded column; 18. Fixing nut; 19. Locking nut; 20. Spring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Please see Figure 1-5 A road bike suspension fork includes a head tube 1 for connecting the handlebars; a fork shoulder 2 is fixedly installed at the bottom of the head tube 1, and sleeves 3 are fixedly installed at both ends of the fork shoulder 2; an inner tube 4 is fixedly installed inside the sleeve 3; an outer tube 5 is fitted on the outside of the inner tube 4; a fork bridge 6 is fixedly installed at the top of the outer tube 5 for the wheel to pass through; and a mounting base 7 is fixedly installed on the bottom side of the outer tube 5 for mounting the wheel.

[0023] Please see Figure 1-5 A torsion cap 9 is movably installed on the upper part of the inner wall of the inner tube 4 via a limiting ring 8. A locking ring is fixedly installed on the top of the torsion cap 9. The locking ring is fitted onto the torsion cap 9 and cannot be twisted. A rotating shaft tube 10 is fixedly installed on the bottom of the torsion cap 9. The bottom of the rotating shaft tube 10 is rotatably connected to the lower part of the inner wall of the inner tube 4 via a bearing 11. The locking ring is removed, and the rotating shaft tube 10 can be driven to rotate in the inner tube 4 via the torsion cap 9. A spring 20 is provided between the bottom of the inner tube 4 and the inner bottom wall of the outer tube 5. When the inner tube 4 and the outer tube 5 move and contract, the spring 20 will also deform accordingly, thereby absorbing the impact force.

[0024] Please see Figure 1-5 A threaded sleeve 12 is slidably installed inside the rotating shaft tube 10. A limiting slider 13 is fixedly installed on the outside of the threaded sleeve 12. A limiting groove 14 corresponding to the limiting slider 13 is opened on the inner wall of the rotating shaft tube 10. The threaded sleeve 12 is slidably installed on the inner wall of the rotating shaft tube 10 through the limiting slider 13 and the limiting groove 14.

[0025] Please see Figure 1-5The threaded sleeve 12 has a threaded rod 15 connected to its internal thread. The top of the threaded rod 15 extends upward into the interior of the rotating shaft tube 10. A limit plate 16 is fixedly installed on the top of the threaded rod 15, and a threaded post 17 is fixedly installed on the bottom of the threaded rod 15. The threaded post 17 is inserted downward into the reserved hole at the bottom of the outer tube 5.

[0026] Please see Figure 1-5 The threaded post 17 is threadedly connected to a fixing nut 18 and a locking nut 19 on its outer side. The fixing nut 18 is fixedly installed on the inner bottom wall of the outer tube 5, and the locking nut 19 presses against the bottom of the outer tube 5. The threaded post 17 is detachably installed on the bottom of the outer tube 5 through the fixing nut 18 and the locking nut 19. Specifically, by loosening and removing the locking nut 19, the threaded post 17 can be loosely twisted out from the fixing nut 18.

[0027] Working principle: During use, the nut 9 drives the pivot tube 10 to rotate, which in turn drives the threaded sleeve 12 to rotate. The threaded sleeve 12 drives the threaded rod 15 to move upward, which in turn drives the outer tube 5 to move upward. The spring 20 is passively compressed. After the spring 20 is compressed, the spring spacing is reduced, the spring force is reduced, and the sliding distance between the inner tube 4 and the outer tube 5 is also shortened, which reduces the overall shock absorption of the fork.

[0028] Conversely, the pivot tube 10 drives the threaded sleeve 12 to reverse, and the threaded sleeve 12 drives the threaded rod 15 to move downward, thus relaxing the spring 20. After the spring 20 relaxes, the spring spacing becomes wider, and the spring force of the spring 20 also increases. The sliding distance between the inner tube 4 and the outer tube 5 also becomes longer, thereby increasing the shock absorption of the entire fork. During this process, the spring force of the spring 20 is controlled by adjusting the spacing of the spring 20, thereby controlling the shock absorption performance of the entire fork.

[0029] After the threaded sleeve 12 drives the threaded rod 15 to move up or down, when the bicycle bumps, the outer tube 5 moves up, and the threaded rod 15 and the threaded sleeve 12 will also move up. The threaded sleeve 12 slides up and down inside the rotating shaft tube 10 through the limiting slider 13 and the limiting groove 14, so as to ensure that the threaded sleeve 12 can both drive the threaded rod 15 to rotate and slide up and down in the rotating shaft tube 10, thus not affecting the expansion and contraction performance between the inner tube 4 and the outer tube 5.

[0030] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A road bike suspension fork, comprising a head tube (1), a fork shoulder (2) fixedly mounted at the bottom of the head tube (1), sleeves (3) fixedly mounted at both ends of the fork shoulder (2), an inner tube (4) fixedly mounted inside the sleeves (3), an outer tube (5) fitted onto the outside of the inner tube (4), a fork bridge (6) fixedly mounted at the top of the outer tube (5), and a mounting base (7) fixedly mounted on the bottom side of the outer tube (5), characterized in that: A torsion cap (9) is movably installed above the inner wall of the inner tube (4) via a limiting ring (8). A rotating shaft tube (10) is fixedly installed at the bottom of the torsion cap (9). The bottom of the rotating shaft tube (10) is rotatably connected to the lower part of the inner wall of the inner tube (4) via a bearing (11). A spring (20) is provided between the bottom of the inner tube (4) and the inner bottom wall of the outer tube (5).

2. The road bike suspension fork according to claim 1, characterized in that: A threaded sleeve (12) is slidably installed inside the rotating shaft tube (10). A limiting slider (13) is fixedly installed on the outside of the threaded sleeve (12). A limiting groove (14) corresponding to the limiting slider (13) is opened on the inner wall of the rotating shaft tube (10). The threaded sleeve (12) is slidably installed on the inner wall of the rotating shaft tube (10) through the limiting slider (13) and the limiting groove (14).

3. The road bike suspension fork according to claim 2, characterized in that: The threaded sleeve (12) is internally threaded with a threaded rod (15). The top of the threaded rod (15) extends upward into the interior of the rotating shaft tube (10). A limiting plate (16) is fixedly installed on the top of the threaded rod (15). A threaded column (17) is fixedly installed on the bottom of the threaded rod (15). The threaded column (17) is inserted downward into the reserved hole at the bottom of the outer tube (5).

4. A road bike suspension fork according to claim 3, characterized in that: The threaded post (17) is threaded with a fixing nut (18) and a locking nut (19) on its outer side. The fixing nut (18) is fixedly installed on the inner bottom wall of the outer tube (5), and the locking nut (19) is pressed against the bottom of the outer tube (5). The threaded post (17) is detachably installed on the bottom of the outer tube (5) through the fixing nut (18) and the locking nut (19).

Images