An internal oil passage damping structure for a front fork

Abstract

The application relates to the technical field of shock-absorbing front forks, and discloses an internal oil path damping structure for a shock-absorbing front fork, which comprises a piston cylinder, the inner wall of the lower portion of the piston cylinder is threadedly connected with an extension pipe, the inner wall of the upper portion of the extension pipe is welded with a T-shaped pipe, the lower end of the extension pipe is fixedly installed with an end cover, the lower end of the T-shaped pipe abuts against the inner wall of the end cover, a plurality of oil outlet holes are arranged in the outer wall of the lower portion of the T-shaped pipe, the T-shaped pipe and a valve core are in sliding fit, a second spring resets the valve core, the damping force is nonlinearly adjusted according to the speed of a piston head, high-speed impact is realized, the valve core compresses the second spring and reduces the opening area of the oil outlet holes, the damping force is rapidly increased to inhibit violent vibration, when low-speed vibration occurs, the second spring resets the valve core, the flow of the oil outlet holes is increased to reduce the damping force, rebound lag is avoided, a first spring and a plug constitute a two-stage buffer, low-speed damping response is further optimized, the opening of the oil outlet holes is adjusted, high-speed impact and low-speed vibration control are enhanced, and shock-absorbing comfort and dynamic adaptability are improved.

Description

Technical Field

[0001] This application relates to the field of shock-absorbing fork technology, specifically to an internal oil circuit damping structure for a shock-absorbing fork. Background Technology

[0002] The internal hydraulic damping structure of the shock-absorbing fork is the core component of the bicycle's shock absorption system. Its core function is to convert the kinetic energy of road impacts into heat energy and dissipate it through the flow and throttling of hydraulic oil in the oil circuit, thereby controlling the compression and rebound speed of the fork and achieving the shock absorption effect.

[0003] Currently, the internal oil circuit damping structure of shock-absorbing forks mostly uses fixed damping holes or simple valve plates for damping during use. The damping force is linearly related to the piston speed, which is not suitable for high-speed impacts and low-speed vibrations. Utility Model Content

[0004] The purpose of this application is to provide an internal oil circuit damping structure for shock-absorbing forks, which solves the problem that the internal oil circuit damping structures for shock-absorbing forks proposed in the background art mostly use fixed damping holes or simple valve plates for damping during use, and the damping force is linearly related to the piston speed, which is not suitable for high-speed impact and low-speed vibration.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This application provides an internal oil circuit damping structure for a shock-absorbing front fork, including a piston cylinder. An extension tube is threadedly connected to the lower inner wall of the piston cylinder. A T-shaped tube is welded to the upper inner wall of the extension tube. An end cap is fixedly installed at the lower end of the extension tube. The lower end of the T-shaped tube abuts against the inner wall of the end cap. Multiple sets of oil outlet holes are opened on the lower outer wall of the T-shaped tube. A valve core is slidably connected to the outer wall of the T-shaped tube above the oil outlet holes. A second spring is sleeved on the outer wall of the T-shaped tube. The two ends of the second spring abut against the end of the T-shaped tube and the valve core, respectively. A first guide rod is fixedly installed on the inner wall of the end cap. A plug is slidably connected to the outer wall of the first guide rod. A first spring is sleeved on the outer wall of the first guide rod. The two ends of the first spring abut against the plug and the inner wall of the end cap, respectively. A piston head is slidably connected to the inner wall of the piston cylinder.

[0007] By adopting the above technical solution, through the sliding cooperation of the T-tube and the valve core, the second spring resets the valve core, allowing the damping force to be non-linearly adjusted according to the piston head speed. In high-speed impact, the valve core compresses the second spring and reduces the opening area of ​​the oil outlet, rapidly increasing the damping force to suppress violent vibration. In low-speed vibration, the second spring pushes the valve core to reset, increasing the oil outlet flow to reduce the damping force and avoid rebound lag. Furthermore, the first spring and the plug form a secondary buffer, further optimizing the low-speed damping response, adjusting the opening of the oil outlet, enhancing the control of high-speed impact and low-speed vibration, and improving shock absorption comfort and dynamic adaptability.

[0008] Optionally, a piston rod is fixedly installed at the upper end of the piston head, the outer wall of the piston rod slides through the inner wall above the piston cylinder, and a fourth sealing ring is embedded in the inner wall of the piston cylinder located around the piston rod, and the inner wall of the fourth sealing ring is slidably connected to the outer wall of the piston rod.

[0009] By adopting the above technical solution, the piston rod can fix the piston head and guide the movement of the piston head, and the second sealing ring can seal the piston rod and piston cylinder. The piston rod can be installed on the front fork bracket.

[0010] Optionally, a second sealing ring is embedded in the inner wall below the extension tube, and the second sealing ring abuts against the inner wall of the end cap.

[0011] By adopting the above technical solution, the second sealing ring can seal the extension tube and the end cap.

[0012] Optionally, the outer wall of the plug is slidably connected to the inner wall of the T-tube, and the inner and outer ring walls of the plug are respectively embedded with a first sealing ring, and the two first sealing rings are slidably connected to the inner wall of the corresponding T-tube and the outer wall of the first guide rod.

[0013] By adopting the above technical solution, the first sealing ring can seal the plug and the T-tube.

[0014] Optionally, a third sealing ring is embedded in the inner wall below the piston cylinder, and the third sealing ring abuts against the upper end of the extension tube.

[0015] By adopting the above technical solution, the third sealing ring can seal the extension tube and the piston cylinder.

[0016] Optionally, a first limiting block is fixedly installed at the upper end of the first guide rod, and two second guide rods are fixedly connected to the upper end of the T-tube. The lower ends of the two second guide rods are respectively fixedly connected to the second limiting blocks, and the two second guide rods slide through the valve core respectively.

[0017] By adopting the above technical solution, the first guide rod can fix the first limiting block, and the first limiting block can limit the plug. The second guide rod can fix the second limiting block, and the second limiting block can limit the valve core. The T-tube can fix the second guide rod, and the second guide rod can further stabilize the lifting and lowering of the valve core.

[0018] Compared with the prior art, the beneficial effects of the technical solution of this application are as follows:

[0019] The technical solution of this application utilizes the sliding cooperation between the T-tube and the valve core, with the second spring resetting the valve core. This allows the damping force to be non-linearly adjusted according to the piston head speed. In high-speed impact mode, the valve core compresses the second spring and reduces the opening area of ​​the oil outlet, rapidly increasing the damping force to suppress severe vibration. During low-speed vibration, the second spring pushes the valve core to reset, increasing the oil outlet flow to reduce the damping force and avoid rebound lag. Furthermore, the first spring and the plug form a secondary buffer, further optimizing the low-speed damping response, adjusting the opening of the oil outlet, enhancing the control of high-speed impact and low-speed vibration, and improving shock absorption comfort and dynamic adaptability. Attached Figure Description

[0020] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0021] Figure 1 This is an axial view schematic diagram of an internal oil circuit damping structure for a shock-absorbing fork according to this application;

[0022] Figure 2 This is a schematic axial view cross-sectional view of an internal oil circuit damping structure for a shock-absorbing fork according to this application;

[0023] Figure 3 This application discloses an internal oil circuit damping structure for a shock-absorbing fork. Figure 2 Enlarged view of point A in the middle;

[0024] Figure 4 This is a schematic diagram of the T-tube of an internal oil circuit damping structure for a shock-absorbing fork according to this application.

[0025] In the diagram: 1. Piston cylinder; 2. Piston head; 3. Extension tube; 4. End cap; 5. T-tube; 6. Oil outlet; 7. Valve core; 8. First guide rod; 9. Plug; 10. First spring; 11. Second spring; 12. Second guide rod; 13. First limiting block; 14. Second limiting block; 15. First sealing ring; 16. Piston rod; 17. Second sealing ring; 18. Third sealing ring; 19. Fourth sealing ring. Detailed Implementation

[0026] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-4 This application provides a technical solution: an internal oil circuit damping structure for a shock-absorbing fork, including a piston cylinder 1, an extension tube 3 threadedly connected to the lower inner wall of the piston cylinder 1, a T-shaped tube 5 welded to the upper inner wall of the extension tube 3, an end cap 4 fixedly installed at the lower end of the extension tube 3, the lower end of the T-shaped tube 5 abutting against the inner wall of the end cap 4, multiple sets of oil outlet holes 6 opened on the lower outer wall of the T-shaped tube 5, a valve core 7 slidably connected to the outer wall of the T-shaped tube 5 above the oil outlet holes 6, a second spring 11 sleeved on the outer wall of the T-shaped tube 5, the two ends of the second spring 11 abutting against the end of the T-shaped tube 5 and the valve core 7 respectively, a first guide rod 8 fixedly installed on the inner wall of the end cap 4, a plug 9 slidably connected to the outer wall of the first guide rod 8, a first spring 10 sleeved on the outer wall of the first guide rod 8, the two ends of the first spring 10 abutting against the plug 9 and the inner wall of the end cap 4 respectively, and a piston head 2 slidably connected to the inner wall of the piston cylinder 1;

[0028] In the technical solution of this application, the T-tube 5 and the valve core 7 slide together, and the second spring 11 resets the valve core 7, allowing the damping force to be nonlinearly adjusted according to the speed of the piston head 2. In the high-speed impact mode, the valve core 7 compresses the second spring 11 and reduces the opening area of ​​the oil outlet 6, quickly increasing the damping force to suppress violent vibration. In the low-speed vibration mode, the second spring 11 pushes the valve core 7 to reset, increasing the flow rate of the oil outlet 6 to reduce the damping force and avoid rebound lag. In addition, the first spring 10 and the plug 9 form a secondary buffer, further optimizing the low-speed damping response, adjusting the opening of the oil outlet 6, enhancing the control of high-speed impact and low-speed vibration, and improving the shock absorption comfort and dynamic adaptability.

[0029] In the technical solution of this application, such as Figure 2 and Figure 3As shown, a first limiting block 13 is fixedly installed at the upper end of the first guide rod 8. Two second guide rods 12 are fixedly connected to the upper end of the T-tube 5. The lower ends of the two second guide rods 12 are respectively fixedly connected to second limiting blocks 14. The two second guide rods 12 slide through the valve core 7. The first guide rod 8 can fix the first limiting block 13, and the first limiting block 13 can limit the plug 9. The second guide rod 12 can fix the second limiting block 14, and the second limiting block 14 can limit the valve core 7. The T-tube 5 can fix the second guide rod 12, and the second guide rod 12 can further stabilize the lifting and lowering of the valve core 7.

[0030] In the technical solution of this application, such as Figure 2 and Figure 3 As shown, the outer wall of the plug 9 is slidably connected to the inner wall of the T-tube 5, and the inner and outer ring walls of the plug 9 are respectively embedded with a first sealing ring 15. The two first sealing rings 15 are slidably connected to the inner wall of the corresponding T-tube 5 and the outer wall of the first guide rod 8. The first sealing rings 15 can seal the plug 9 and the T-tube 5. The inner wall below the extension tube 3 is embedded with a second sealing ring 17. The second sealing ring 17 abuts against the inner wall of the end cap 4. The second sealing ring 17 can seal the extension tube 3 and the end cap 4. The inner wall below the piston cylinder 1 is embedded with a third sealing ring 18. The third sealing ring 18 abuts against the upper end of the extension tube 3. The third sealing ring 18 can seal the extension tube 3 and the piston cylinder 1.

[0031] In the technical solution of this application, such as Figure 1 and Figure 2 As shown, a piston rod 16 is fixedly installed on the upper end of the piston head 2. The outer wall of the piston rod 16 slides through the inner wall above the piston cylinder 1. A fourth sealing ring 19 is embedded in the inner wall of the piston cylinder 1 around the piston rod 16. The inner wall of the fourth sealing ring 19 is slidably connected to the outer wall of the piston rod 16. The piston rod 16 can fix the piston head 2 and guide the movement of the piston head 2. The second sealing ring 17 can seal the piston rod 16 and the piston cylinder 1. The piston rod 16 can be installed on the front fork bracket.

[0032] In use, the T-tube 5 and valve core 7 slide together, and the second spring 11 resets the valve core 7, allowing the damping force to be non-linearly adjusted according to the speed of the piston head 2. In high-speed impact mode, the valve core 7 compresses the second spring 11 and reduces the opening area of ​​the oil outlet 6, quickly increasing the damping force to suppress violent vibration. In low-speed vibration mode, the second spring 11 pushes the valve core 7 to reset, increasing the flow rate of the oil outlet 6 to reduce the damping force and avoid rebound lag. The first spring 10 and the plug 9 form a secondary buffer, further optimizing the low-speed damping response, adjusting the opening of the oil outlet 6, enhancing the control of high-speed impact and low-speed vibration, improving shock absorption comfort and dynamic adaptability. The multiple sets of sealing rings can seal the connection of the equipment. After the end cover 4 is removed, the operator can change the hydraulic oil inside the piston cylinder 1 through the T-tube 5.

Claims

1. An internal oil circuit damping structure for a shock-absorbing fork, characterized in that: The device includes a piston cylinder (1), an extension tube (3) threadedly connected to the lower inner wall of the piston cylinder (1), a T-shaped tube (5) welded to the upper inner wall of the extension tube (3), an end cap (4) fixedly installed at the lower end of the extension tube (3), the lower end of the T-shaped tube (5) abutting against the inner wall of the end cap (4), multiple sets of oil outlet holes (6) opened on the lower outer wall of the T-shaped tube (5), a valve core (7) slidably connected to the outer wall of the T-shaped tube (5) above the oil outlet holes (6), and a sleeve on the outer wall of the T-shaped tube (5). There is a second spring (11), the two ends of the second spring (11) abut against the end of the T-tube (5) and the valve core (7) respectively. The inner wall of the end cap (4) is fixedly installed with a first guide rod (8). The outer wall of the first guide rod (8) is slidably connected with a plug (9). The outer wall of the first guide rod (8) is sleeved with a first spring (10). The two ends of the first spring (10) abut against the plug (9) and the inner wall of the end cap (4) respectively. The inner wall of the piston cylinder (1) is slidably connected with a piston head (2).

2. The internal oil circuit damping structure for a shock-absorbing fork according to claim 1, characterized in that, A piston rod (16) is fixedly installed at the upper end of the piston head (2). The outer wall of the piston rod (16) slides through the inner wall above the piston cylinder (1). A fourth sealing ring (19) is embedded in the inner wall of the piston cylinder (1) around the piston rod (16). The inner wall of the fourth sealing ring (19) is slidably connected to the outer wall of the piston rod (16).

3. The internal oil circuit damping structure for a shock-absorbing fork according to claim 1, characterized in that, A second sealing ring (17) is embedded in the inner wall below the extension tube (3), and the second sealing ring (17) abuts against the inner wall of the end cap (4).

4. The internal oil circuit damping structure for a shock-absorbing fork according to claim 1, characterized in that, The outer wall of the plug (9) is slidably connected to the inner wall of the T-tube (5), and the inner and outer ring walls of the plug (9) are respectively embedded with first sealing rings (15), and the two first sealing rings (15) are slidably connected to the inner wall of the corresponding T-tube (5) and the outer wall of the first guide rod (8).

5. The internal oil circuit damping structure for a shock-absorbing fork according to claim 1, characterized in that, A third sealing ring (18) is embedded in the inner wall below the piston cylinder (1), and the third sealing ring (18) abuts against the upper end of the extension tube (3).

6. The internal oil circuit damping structure for a shock-absorbing fork according to claim 1, characterized in that, The upper end of the first guide rod (8) is fixedly installed with a first limiting block (13), and the upper end of the T-tube (5) is fixedly connected with two second guide rods (12). The lower ends of the two second guide rods (12) are respectively fixedly connected with second limiting blocks (14), and the two second guide rods (12) slide through the valve core (7).

Images