A spring front fork

Abstract

The invention discloses a spring front fork, which belongs to the technical field of shock absorbers, and comprises a cylinder body, a first cylinder body, a second cylinder body, a steering seat, a spring and a damping sleeve, wherein the spring sleeve is arranged on the first cylinder body between the cylinder body and the steering seat; the damping sleeve is arranged in the cylinder body and contacts with the inner wall of the cylinder body; wherein the second cylinder body extends out of the first cylinder body and is provided with an adjusting tooth at one end in the cylinder body, and a limiting tooth is provided on the inner wall of the damping sleeve; a damping adjustment rod is inserted in the second cylinder body. By rotating the second cylinder body, the meshing state of the adjusting tooth on the second cylinder body and the limiting tooth on the damping sleeve can be changed, so that the meshing position can be adjusted and the preload force of the spring can be changed; when the damping adjustment rod is rotated, the driving groove on the damping adjustment rod can be pushed against the adjusting tooth, so that the adjusting tooth is pressed against the inner wall of the damping sleeve, the pressing force between the damping sleeve and the inner wall of the cylinder body is increased, the sliding friction between the damping sleeve and the inner wall of the cylinder body is increased, and the damping size can be adjusted.

Description

Technical Field

[0001] The invention relates to the technical field of shock absorbers, and in particular to a spring front fork. Background Art

[0002] In the suspension systems of vehicles such as bicycles, motorcycles and electric tricycles, the front fork is a key component, and its performance directly affects the vehicle's handling stability, comfort and safety. Among them, the spring front fork is the most common type of front fork. Traditional spring front forks use compression springs to mitigate impacts. Since the springs compress and rebound quickly, the buffering effect on bumpy roads is average. At present, there are also some spring front forks that are equipped with damping structures, so that when the springs are compressed and rebounded, the elastic potential energy can be consumed through the damping system, thereby better mitigating the impact. However, the existing damping system is usually not adjustable, so that users cannot change the buffering effect of the spring front fork according to their own needs. When maintaining the damping system, it is often necessary to disassemble the front fork components, which is not only time-consuming and labor-intensive, but may also damage other components due to improper operation.

[0003] Therefore, the present invention proposes a spring front fork. Summary of the invention

[0004] In view of the above-mentioned technical deficiencies, an object of the present invention is to provide a spring front fork capable of adjusting the preload force and damping size of the spring.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solution: The present invention provides a spring front fork, comprising:

[0006] Cylinder body;

[0007] A first cylinder, which is movably inserted in the cylinder body;

[0008] A second cylinder, the second cylinder is inserted into the first cylinder, and when the first cylinder moves, the second cylinder moves along with the first cylinder;

[0009] A steering seat, wherein the steering seat is fixed on the first cylinder;

[0010] A spring, wherein the spring is sleeved on the first cylinder between the cylinder body and the steering seat;

[0011] A damping sleeve, the damping sleeve is arranged in the cylinder body and contacts with the inner wall of the cylinder body;

[0012] Wherein, the second cylinder extends out of the first cylinder and is provided with an adjusting tooth at one end in the cylinder, and the inner wall of the damping sleeve is provided with a limiting tooth; when the adjusting tooth is engaged with the limiting tooth, the damping sleeve moves with the first cylinder;

[0013] A damping adjustment rod is inserted into the second cylinder, and the damping adjustment rod is used to push the adjustment teeth so that the end of the adjustment teeth is against the inner wall of the damping sleeve. When the pressing force between the damping adjustment rod and the adjustment teeth is changed, the sliding friction between the damping sleeve and the inner wall of the cylinder body changes accordingly.

[0014] Preferably, a plurality of through holes are provided on the side wall of the second cylinder, the adjusting teeth are movably inserted into each of the through holes, a plurality of driving grooves are provided on the damping adjustment rod, and an end of the adjusting teeth away from the damping sleeve is located in the corresponding driving groove.

[0015] Preferably, the driving groove surrounds the circumferential surface of the damping adjustment rod, and the groove wall of the driving groove is tapered.

[0016] Preferably, one end of the adjusting tooth close to the driving groove is provided with a conical surface that matches with the groove wall of the driving groove.

[0017] Preferably, a flow channel for injecting lubricant is opened inside the damping adjustment rod, and the flow channel is connected to the driving groove.

[0018] Preferably, a first wedge-shaped portion is provided on one side of the adjusting tooth, and a second wedge-shaped portion cooperating with the first wedge-shaped portion is provided on the limiting tooth.

[0019] Preferably, the damping sleeve comprises a first half shell and a second half shell, the first half shell and the second half shell are butt-jointed to form a cylindrical shape, and the butt joint between the first half shell and the second half shell is staggered with concave and convex.

[0020] Preferably, a key slot is provided on the bottom side wall of the first cylinder, and a limit key cooperating with the key slot is fixed on the inner wall of the damping sleeve.

[0021] The beneficial effects of the present invention are:

[0022] The present invention is provided with a first cylinder, a second cylinder and a damping adjustment rod. By rotating the second cylinder, the meshing state of the adjusting teeth on the second cylinder and the limiting teeth on the damping sleeve can be changed, so that the meshing position can be adjusted and the preload force of the spring can be changed. When the damping adjustment rod is rotated, the driving groove on the damping adjustment rod can be pushed against the adjusting teeth, so that the adjusting teeth are pressed against the inner wall of the damping sleeve, thereby increasing the pressing force between the damping sleeve and the inner wall of the cylinder body, increasing the sliding friction between the damping sleeve and the inner wall of the cylinder body, and realizing the adjustment of the damping size. The present invention further provides a flow channel in the damping adjustment rod. There is no need to disassemble the front fork. By injecting lubricant into the flow channel, lubrication of the adjusting teeth and the limiting teeth can be achieved, and maintenance is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of the overall structure of a spring front fork provided in an embodiment of the present invention.

[0025] Figure 2 It is a top view of the overall structure of the present invention.

[0026] Figure 3 for Figure 2 Cross-sectional view at AA in the middle.

[0027] Figure 4 for Figure 3 A partial enlarged view of point A in the middle.

[0028] Figure 5 for Figure 3 A partial enlarged view of point B in the middle.

[0029] Figure 6 for Figure 5 A partial enlarged view of point C in the middle.

[0030] Figure 7 It is a schematic structural diagram of the second cylinder and the first cylinder of the present invention.

[0031] Figure 8 It is a top view of the damping sleeve of the present invention.

[0032] Fig. 9 It is a three-dimensional view of the first half shell and the second half shell of the present invention.

[0033] Description of reference numerals:

[0034] 1. Cylinder body, 2. First cylinder body, 3. Second cylinder body, 4. Steering seat, 5. Spring, 6. Damping sleeve, 7. Adjusting teeth, 8. Limiting teeth, 9. Damping adjusting rod, 10. Driving groove, 11. Flow channel, 12. First wedge-shaped portion, 13. Second wedge-shaped portion, 14. First half shell, 15. Second half shell, 16. Keyway, 17. Limiting key, 18. Plug cap, 19. Limiting cover. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1:

[0037] like Figures 1 to 9 As shown, Embodiment 1 of the present invention provides a spring front fork for an electric tricycle, which specifically includes two cylinder bodies 1, two first cylinder bodies 2 and a steering seat 4, wherein the two first cylinder bodies 2 are symmetrically fixed and inserted on the steering seat 4. A limit cover 19 is threadedly installed on the cylinder body 1, and one end of the first cylinder body 2 away from the steering seat 4 passes through the limit cover 19 and is inserted into the cylinder body 1. A spring 5 is sleeved on the first cylinder body 2 between the limit cover 19 and the steering seat 4. When in use, a connecting frame is also welded between the two cylinder bodies 1 to fix the relative positions of the two cylinder bodies 1. A fixing seat for mounting the wheel axle is welded at the bottom of the cylinder body 1, and the structure of the fixing seat is omitted in the accompanying drawings of the present invention.

[0038] The front of the vehicle is mounted on the steering seat 4. When encountering a bumpy road section, the steering seat 4 will compress the spring 5 to cushion the front of the vehicle. However, if the vehicle relies solely on the spring 5 for cushioning, when encountering a bumpy road section, the front of the vehicle will quickly compress the spring 5, and the spring 5 will also rebound quickly, causing the front of the vehicle to shake repeatedly, resulting in poor shock absorption effect.

[0039] Therefore, the present invention provides a damping system, through which vibration is consumed, thereby providing a better buffering effect.

[0040] The damping system of the present invention comprises a damping sleeve 6 inserted in the cylinder body 1 and a second cylinder body 3 inserted in the first cylinder body 2. The damping sleeve 6 is made of nylon material, and the outer wall of the damping sleeve 6 fits the inner wall of the cylinder body 1, so that when the damping sleeve 6 moves in the cylinder body 1, it has a certain sliding friction, bringing a damping effect. The function of the limit cover 19 is to block the top of the cylinder body 1 so that the damping sleeve 6 will not be separated from the cylinder body 1.

[0041] The second cylinder 3 is rotatably mounted in the first cylinder 2. Figure 7 As shown, two rows of through holes are symmetrically opened at the bottom of the second cylinder 3, and a limiting tooth 8 is movably inserted in each row of through holes. Figure 8 and Fig. 9As shown, the damping sleeve 6 is formed by splicing the first half shell 14 and the second half shell 15, which are butt-jointed into a cylindrical shape, and the joint is staggered with concave and convex, so that the first half shell 14 and the second half shell 15 can rise and fall together in the cylinder body 1. Constrained by the shape of the cylinder body 1, the first half shell 14 and the second half shell 15 will not separate in the cylinder body 1, and the overall shape of the damping sleeve 6 can be maintained. A row of limiting teeth 8 are fixed on the inner walls of the first half shell 14 and the second half shell 15. Figure 8 As shown, since the limiting teeth 8 are only distributed on a part of the inner wall of the damping sleeve 6, when the second cylinder 3 is rotated, the regulating teeth 7 and the limiting teeth 8 can be in a disengaged state or in an engaged state.

[0042] When the adjusting teeth 7 are disengaged from the limiting teeth 8, the second cylinder 3 and the first cylinder 2 will not move with the damping sleeve 6 when they are raised or lowered; when the adjusting teeth 7 are engaged with the limiting teeth 8, the second cylinder 3 and the first cylinder 2 will move with the damping sleeve 6 when they are raised or lowered. Figures 1 to 6 As shown, since the damping sleeve 6 can only move to the position against the limit cover 19 when it rises, the meshing position of the adjusting teeth 7 and the limit teeth 8 can be changed by rotating the second cylinder 3 and pressing down the second cylinder 3, thereby changing the initial compression degree of the spring 5, so that the user can adjust the preload force of the spring 5 according to their own situation.

[0043] The present invention further includes a damping adjustment rod 9 inserted into the second cylinder 3 and threadedly matched with the second cylinder 3. Figure 5 and Figure 6 As shown, the outer wall of the lower end of the damping adjustment rod 9 is provided with multiple layers of driving grooves 10 surrounding the damping adjustment rod 9, and the groove wall of the driving groove 10 is inclined and is tapered as a whole. The end of the adjusting tooth 7 in the second cylinder 3 is provided with a conical surface that matches the groove wall of the driving groove 10. Since the adjusting tooth 7 is movably inserted in the through hole, when the damping adjustment rod 9 moves downward in the second cylinder 3, the driving groove 10 can push the conical surface to move the adjusting tooth 7 toward the inner wall of the damping sleeve 6. By rotating the damping adjustment rod 9, the pressing force of the adjusting tooth 7 on the damping sleeve 6 is increased, thereby increasing the sliding friction between the damping sleeve 6 and the inner wall of the cylinder 1, and the blocking effect of the spring 5 during compression and rebound is stronger, thereby more effectively consuming the elastic potential energy of the spring 5. The user can change the sliding friction between the damping sleeve 6 and the inner wall of the cylinder 1 by adjusting the damping adjustment rod 9 according to their own needs.

[0044] During use, the user can change the meshing state of the adjusting teeth 7 and the limiting teeth 8 by rotating the second cylinder 3 according to his own needs, and then change the meshing position of the adjusting teeth 7 and the limiting teeth 8 by compressing the spring 5, thereby changing the preload force of the spring 5; by rotating the damping adjustment rod 9, the pressing force of the adjusting teeth 7 on the inner wall of the damping sleeve 6 is changed, thereby changing the sliding friction between the damping sleeve 6 and the inner wall of the cylinder body 1 and adjusting the damping size.

[0045] Embodiment 2:

[0046] On the basis of the first embodiment, the present invention further provides a flow channel 11 in the damping adjustment rod 9. Figures 3 to 6 As shown, a plugging cap 18 is provided on the top of the damping adjustment rod 9, and the plugging cap 18 can be opened to add lubricating oil or grease into the flow channel 11. The lubricating oil or grease can move downward along the flow channel 11, enter the gap between the adjusting teeth 7 and the through hole from the part of the flow channel 11 connected to the driving groove 10, and then enter between the adjusting teeth 7 and the limiting teeth 8, to prevent the adjusting teeth 7 and the limiting teeth 8 from being stuck due to insufficient lubrication.

[0047] like Figure 7 and Fig. 9 As shown, the present invention further has key slots 16 symmetrically opened on the bottom side wall of the first cylinder 2, and a limit key 17 matched with the key slot 16 is fixed on the inner wall of the damping sleeve 6. When the end of the first cylinder 2 located in the cylinder body 1 is inserted into the damping sleeve 6, the limit key 17 is inserted into the key slot 16. Therefore, when the second cylinder 3 is rotated, the damping sleeve 6 is restricted by the key cooperation and will not rotate together, thereby smoothly changing the meshing state of the adjusting teeth 7 and the limit teeth 8.

[0048] Embodiment three:

[0049] On the basis of the first and second embodiments, in order to make it easier for the adjusting teeth 7 to mesh with the limiting teeth 8 when changing the meshing position of the adjusting teeth 7 and the limiting teeth 8, the present invention further provides a first wedge-shaped portion 12 on one side of the adjusting teeth 7, and provides a second wedge-shaped portion 13 that cooperates with the first wedge-shaped portion 12 on the limiting teeth 8. With the cooperation of the first wedge-shaped portion 12 and the second wedge-shaped portion 13, when the second cylinder 3 is rotated, it is easier for the adjusting teeth 7 to mesh with the limiting teeth 8, and it is more convenient to adjust.

[0050] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A spring front fork, characterized in that: include: Cylinder body (1); A first cylinder (2), the first cylinder (2) being movably inserted into the cylinder (1); a second cylinder (3), the second cylinder (3) being inserted into the first cylinder (2), and when the first cylinder (2) moves, the second cylinder (3) moves along with the first cylinder (2); A steering seat (4), wherein the steering seat (4) is fixed on the first cylinder (2); A spring (5), wherein the spring (5) is sleeved on the first cylinder (2) between the cylinder body (1) and the steering seat (4); A damping sleeve (6), wherein the damping sleeve (6) is arranged in the cylinder body (1) and contacts the inner wall of the cylinder body (1); Wherein, one end of the second cylinder (3) extending out of the first cylinder (2) and located in the cylinder (1) is provided with an adjusting tooth (7), and the inner wall of the damping sleeve (6) is provided with a limiting tooth (8); when the adjusting tooth (7) is meshed with the limiting tooth (8), the damping sleeve (6) moves along with the first cylinder (2); A damping adjustment rod (9) is inserted into the second cylinder (3), and the damping adjustment rod (9) is used to push against the adjustment teeth (7) so that the end of the adjustment teeth (7) abuts against the inner wall of the damping sleeve (6). When the abutting force between the damping adjustment rod (9) and the adjustment teeth (7) is changed, the sliding friction between the damping sleeve (6) and the inner wall of the cylinder (1) changes accordingly; A plurality of through holes are provided on the side wall of the second cylinder (3), and the adjusting tooth (7) is movably inserted into each of the through holes. The damping adjustment rod (9) is provided with a plurality of driving grooves (10), and an end of the adjusting tooth (7) away from the damping sleeve (6) is located in a corresponding driving groove (10).

2. A spring front fork as claimed in claim 1, characterized in that: The driving groove (10) surrounds the circumferential surface of the damping adjustment rod (9), and the groove wall of the driving groove (10) is conical.

3. A spring front fork as claimed in claim 2, characterized in that: One end of the adjusting tooth (7) close to the driving groove (10) is provided with a conical surface that matches the groove wall of the driving groove (10).

4. A spring front fork as claimed in claim 1, characterized in that: A flow channel (11) for injecting lubricant is provided inside the damping adjustment rod (9), and the flow channel (11) is communicated with the driving groove (10).

5. A spring front fork as claimed in claim 1, characterized in that: A first wedge-shaped portion (12) is provided on one side of the regulating tooth (7), and a second wedge-shaped portion (13) cooperating with the first wedge-shaped portion (12) is provided on the limiting tooth (8).

6. A spring front fork as claimed in claim 1, characterized in that: The damping sleeve (6) comprises a first half shell (14) and a second half shell (15); the first half shell (14) and the second half shell (15) are butt-jointed to form a cylindrical shape; the butt joint between the first half shell (14) and the second half shell (15) is alternately concave and convex.

7. A spring front fork as claimed in claim 1, characterized in that: A key slot (16) is provided on the bottom side wall of the first cylinder (2), and a limit key (17) cooperating with the key slot (16) is fixed on the inner wall of the damping sleeve (6).

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