A dual damping front fork

Abstract

The utility model relates to the technical field of shock absorption, especially a double shock absorption front fork, which comprises a front fork frame, a first shock absorption device is arranged on the front fork frame, a front fork auxiliary support is rotatably connected to the lower end of the front fork frame, a front wheel is rotatably connected to one end of the front fork auxiliary support, a second shock absorption device is arranged between the other end of the front fork auxiliary support and the front fork frame, the first shock absorption device and the second shock absorption device can play a role in turn when the vehicle passes through roads with different bumping degrees, the device has better passability, can bring better riding experience to the user, and reduces the vibration of the vehicle when passing through uneven roads.

Description

Technical Field

[0001] This utility model relates to the field of shock absorption technology, and in particular to a dual shock absorption front fork. Background Technology

[0002] Two-wheeled vehicles are an important means of transportation. Whether it's a bicycle, electric bike, or motorcycle, when traversing rough roads, the road conditions are transmitted to the rider through the front wheel and frame, resulting in a poor riding experience. Current technology often uses spring or hydraulic shock absorbers mounted on the front fork to filter vibrations transmitted from the front wheel, reducing the impact on the rider. However, relying solely on the front fork's shock absorbers is not completely effective at eliminating shocks; the rider can still feel a noticeable impact when riding on rough roads. Therefore, a dual-shock-absorbing front fork is needed to solve these problems. Utility Model Content

[0003] The purpose of this invention is to provide a dual-damping front fork to solve the problems mentioned in the background art.

[0004] A dual-damping front fork, characterized in that it includes a front fork frame, the front fork frame is provided with a first damping device, the lower end of the front fork frame is rotatably connected to a front fork sub-bracket, one end of the front fork sub-bracket is rotatably connected to a front wheel, and the other end of the front fork sub-bracket is provided with a second damping device between it and the front fork frame.

[0005] Preferably, the fork frame includes a fork top tube, one end of which is fixedly connected to a fork shoulder cap, and both ends of the fork shoulder cap are fixedly connected to two fork inner tubes. The two fork inner tubes are connected to a fork main frame tube via a first shock absorber, and the fork main frame tube is rotatably connected to a fork sub-support.

[0006] Preferably, the second shock absorption device includes a sleeve disposed on the front fork sub-support. A limiting plate is provided at one end of the sleeve near the front fork frame. A shock absorption spring is provided inside the sleeve. A pull rod is also provided inside the sleeve, passing through the sleeve and the limiting plate. One end of the pull rod is fixedly connected to the front fork frame, and the other end of the pull rod is provided with a limiting device, which is slidably connected inside the sleeve.

[0007] Preferably, the limiting device includes a limiting nut, and a limiting baffle is provided between the limiting nut and the shock-absorbing spring, the limiting baffle being slidably disposed inside the limiting tube.

[0008] Preferably, a fork shoulder plate is fixedly connected to the inner tube of the fork, and the fork shoulder plate is fixedly connected to the upper tube of the fork by bolts. One end of the pull rod is fixedly connected to the fork shoulder plate.

[0009] Preferably, the connection point between the fork main frame tube and the fork subframe is located near the end of the fork subframe.

[0010] Preferably, a U-shaped connector is fixedly connected to the fork sub-support, and the fork main frame tube is rotatably connected to the fork sub-support through the U-shaped connector. The movement angle of the fork sub-support is limited by the U-shaped connector.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] This invention features a triangular structure comprised of a front fork frame, a front fork subframe, and a second shock absorber. The second shock absorber is connected to the front fork subframe via a tie rod fixedly connected to the front fork frame. When the front wheel travels over an uneven road surface, the contact between the road surface and the front wheel causes it to move up and down. This up-and-down movement of the front wheel is converted into rotation of the front fork subframe. This rotation occurs around the hinge point between the front fork subframe and the front fork main tube. The rotation of the front fork subframe causes the sleeve on it to move approximately along the tie rod away from the front fork main tube. The amount of rotation of the front fork subframe is relatively small because the U-shaped connector on the front fork main tube limits the rotation of the front fork subframe. Its rotation will be blocked by the U-shaped connector when it reaches a certain extent.

[0013] The tie rod is fixedly connected to the front fork frame. The through hole on the limiting plate is much larger than the diameter of the tie rod, allowing the tie rod some room to move relative to the sleeve. The limiting baffle on the tie rod directly limits the shock absorber spring. When the front fork sub-fork frame rotates due to the influence of the front wheel, it will drive the sleeve to move as well. When the sleeve moves, the limiting plate on it will push the shock absorber spring to move. The other end of the shock absorber spring abuts against the limiting baffle. The limiting baffle is limited by the limiting bolt at the height of the tie rod and cannot move. Therefore, the shock absorber spring will be compressed by the moving limiting plate and the fixed limiting baffle, thus absorbing vibration. However, the shock absorber spring will not be compressed indefinitely. Therefore, a U-shaped connector is provided to control the rotation angle of the front fork subframe, thereby controlling the compression of the shock absorber spring. When the vibration is too large, reaching the maximum compression of the spring, the front fork subframe will press against the U-shaped connector, thus directly transmitting the vibration to the first shock absorber. The first shock absorber absorbs the vibration. The shock absorber spring has a small stiffness coefficient and is relatively soft, while the first shock absorber is relatively stiffer. Uneven surfaces such as small stones on the road are first absorbed by the second shock absorber, while larger steps or potholes are absorbed by the first shock absorber. The two shock absorbers work together to reduce the impact of front wheel vibration on the rider during riding.

[0014] Meanwhile, the position of the limiting baffle in the second shock absorber can be adjusted by the limiting nut, thereby adjusting the angle between the fork sub-bracket and the fork main frame tube, and thus adjusting the support strength of the shock absorber spring on the fork sub-bracket, to support people of different weights and increase adaptability. Attached Figure Description

[0015] Figure 1 This is a side view of one embodiment of the present invention.

[0016] Figure 2 This is a three-dimensional structural diagram of the front fork frame portion according to an embodiment of the present invention;

[0017] Figure 3 This is a schematic cross-sectional view of the sleeve portion in one embodiment of the present invention;

[0018] Figure 4 This is a second-view three-dimensional structural diagram of the front fork frame in one embodiment of the present invention.

[0019] In the diagram: 1. Front fork frame; 11. Front fork top tube; 12. Front fork shoulder cap; 13. Front fork inner tube; 14. First shock absorber; 15. Front fork main frame tube; 16. Fork shoulder subplate; 17. Tie rod; 2. Rear fork frame; 3. Front fork sub-bracket; 31. Sleeve; 32. Shock absorber spring; 33. Limiting baffle; 34. Limiting nut; 35. U-shaped connector; 36. Limiting plate. Detailed Implementation

[0020] The following will describe specific embodiments and appendices. Figure 1-4 The technical solutions in the embodiments of this utility model will be clearly and completely described.

[0021] A dual-damping front fork includes a front fork frame 1, which is rotatably connected to a rear fork frame 2 (existing technology). The rear fork frame 2 is a prior art device. A first damping device 14 is provided on the front fork frame 1. A front fork sub-support 3 is rotatably connected to the lower end of the front fork frame 1. The front wheel is rotatably connected to the front end of the front fork sub-support 3. A second damping device is provided between the rear end of the front fork sub-support 3 and the front fork frame 1. The first damping device 14 is relatively stiff, while the second damping device is relatively soft. Small vibrations from the road surface are first damped by the second damping device. When encountering steps or larger potholes, the vibration is absorbed by the first damping device 14. The two damping devices work together to adapt to different road surfaces according to their elasticity, thereby increasing the user's riding experience and improving riding comfort.

[0022] The fork frame 1 includes a fork top tube 11, which is used to connect handlebars and other equipment. A fork shoulder cap 12 is fixedly connected to the lower end of the fork top tube 11. The fork shoulder cap 12 is perpendicular to the fork top tube 11, with its two ends distributed on the left and right sides of the lower end of the fork top tube 11. Two fork inner tubes 13 are fixedly connected to the bottom of both ends of the fork shoulder cap 12. The fork frame 1 is fork-shaped in general. A first shock absorber 14 is connected to each of the two fork inner tubes 13. The other end of the first shock absorber 14 is connected to the fork main frame tube 15. The first shock absorber 14 is existing technology and uses springs or hydraulic pressure for shock absorption. In this embodiment, spring shock absorption is used. The spring is relatively stiff. It will only compress when it encounters a step or a large pothole. Under smaller impacts, it can still maintain its support capacity. The fork main frame tube 15 is rotatably connected to the fork sub-support 3.

[0023] The fork subframe 3 has two arms, each with a U-shaped connector 35 fixedly connected to it. The two fork mainframe tubes 15 are rotatably connected to the two U-shaped connectors 35, allowing the fork mainframe tubes 15 to be rotatably connected to the fork subframe 3 via the U-shaped connectors 35. The movement angle of the fork subframe 3 is limited by the U-shaped connectors 35. The front wheel is rotatably connected to the front end of the fork subframe 3, and the front wheel is in contact with the ground. The U-shaped connector 35 will block the fork mainframe tube 15 on the side away from the front wheel. When the fork subframe 3 rotates to a certain angle, the U-shaped connector 35 will abut against the fork mainframe tube 15, thus keeping the rotation angle between the fork subframe 3 and the fork mainframe tube 15 within a certain limit. The rear fork 2 is equipped with a seat. When a person sits on the vehicle, the pressure is transmitted through the rear fork 2 to the front fork 1, causing the front fork to generate downforce. Finally, the downforce of the front fork 2 is transmitted through the front fork main frame tube 15 to the front fork sub-support 3, and then through the front fork sub-support 3 to the front wheel, which can increase the front wheel's passability and stability. The rotation of the front fork sub-support 3 can transmit the impact to the second shock absorber, which increases the buffering capacity of the front fork 1 and can prevent the front fork 1 from breaking.

[0024] The second shock absorber includes a sleeve 31, which is fixedly mounted on the side of the front fork sub-support 3 away from the front wheel. A limiting plate 36 is located at the upper end of the sleeve 31, near the front fork frame 1. The limiting plate 36 has a central opening. A shock absorber spring 32 is located inside the sleeve 31. The limiting plate 36 can limit and prevent the shock absorber spring 32 from passing through the upper end of the sleeve 31. A pull rod 17 is also located inside the sleeve 31, passing through the sleeve 31 and exiting through the central opening of the limiting plate 36. One end of the pull rod 17 is fixedly connected to the front fork frame 1, and the other end of the pull rod 17 has a limiting device. The limiting device is slidably connected inside the sleeve 31 and located below the shock absorber spring 32. The limiting device includes a limiting nut 34, which is threaded onto... A limiting baffle 33 is provided between the limiting nut 34 and the shock absorber spring 32, attached to the pull rod 17. The limiting baffle 33 is sleeved on the pull rod 17 and is slidably disposed within the sleeve 31. The diameter of the limiting baffle 33 is approximately the same as the diameter of the shock absorber spring 32, preventing the shock absorber spring 32 from passing through the lower end of the sleeve 31. A fork shoulder plate 16 is fixedly connected to the inner tube 13 of the fork. The fork shoulder plate 16 is fixedly connected to the upper tube 11 of the fork by bolts. An expansion bolt is inserted into the upper tube 11 of the fork, passing through the fork shoulder plate 16. The fork shoulder plate 16 is connected to the expansion bolt by a nut, which enhances the connection stability and prevents excessive stress from causing cracks. One end of the pull rod 17 is fixedly connected to the fork shoulder plate 16. 6. When the front wheel is subjected to force, the entire fork sub-support 3 will rotate. The direction of rotation is downward at the rear end of the fork sub-support 3, which causes the sleeve 31 on it to move approximately along the direction of the tie rod 17, i.e., the sleeve 31 moves downward. The downward movement of the sleeve 31 will cause the limiting plate 36 on the sleeve 31 to push the shock-absorbing spring 32. The other end of the shock-absorbing spring 32 abuts against the limiting baffle 33. The limiting baffle 33 is relatively fixed, so the shock-absorbing spring 32 cannot move. It will then be compressed as the limiting plate 31 moves to absorb vibration. The limiting baffle 33 is relatively fixed to the tie rod 17 by the limiting nut 34. Because the path of the sleeve 31 when it rotates with the fork sub-support 3 is not the same as the axis of the tie rod 17, the sleeve 31... The inner diameter of the through hole on the limiting plate 36 is much larger than the outer diameter of the tie rod 17, which allows it to limit the shock absorber spring 32 while maximizing the relative movement between the tie rod 17 and the sleeve 31. When the front wheel encounters a step or other road condition, the impact will cause the front fork sub-support 3 to rotate around its hinge point with the front fork main frame tube 15. This rotation will cause the sleeve 31 to move downwards, and the limiting plate 36 in the sleeve 31 will compress the shock absorber spring 32 towards the limiting baffle 33. Thus, the shock is absorbed by the shock absorber spring 32, reducing the impact of uneven road surfaces on the rider. When the impact is too large, causing the shock absorber spring 32 to compress to its limit, the first shock absorber 14 will be activated, causing the spring in the first shock absorber 14 to compress and absorb the vibration.The implementation involves using a spring constant 32 that is significantly smaller than that of the spring used in the first damping device 14. This allows the first damping device 14 to remain inactive when the second damping device can filter minor vibrations. However, when the impact on the front wheel exceeds the applicable range of the second damping device, the spring 32 in the second damping device is compressed to its limit, and the first damping device becomes active. The two damping devices work together to provide better shock absorption for the vehicle under various complex road conditions, increasing its passability. The connection point between the main frame tube 15 and the subframe 3 is located near the end of the subframe 3.

[0025] The fork frame 1, the fork subframe 3, and the second shock absorber form a triangular structure. In its stable state, the U-shaped connector 35 can limit the rotation of the fork subframe 3. When the fork subframe rotates, the U-shaped connector 35 can abut against the fork main frame tube, thus limiting its angle of movement. Under the elastic force of the shock absorber spring 32 in the second shock absorber, the rear end of the fork subframe 3 will tend to rotate upward. The U-shaped connector 35 is behind the fork main frame tube 15 and abuts against the fork main frame tube 15, keeping the triangle in a stable state. By adjusting the limiting nut 34 in the second shock absorber, the limiting baffle 33 can be controlled to move closer to or further away from the limiting plate 36, thereby adjusting the shock absorber spring 32 between the two, thus adjusting the range of rotation angle that the fork subframe 3 can rotate when working, thereby adjusting and increasing the front wheel passability and the ability to quickly absorb shocks.

[0026] This invention utilizes a triangular structure formed by the front fork frame 1, the front fork sub-support 3, and the second shock absorber. When the front wheel travels over an uneven road surface, the contact between the road surface and the front wheel causes the front wheel to move up and down. This up and down movement of the front wheel is converted into the rotation of the front fork sub-support 3. This rotation occurs around the hinge point between the front fork sub-support 3 and the front fork main frame tube 15. The rotation of the front fork sub-support 3 will cause the sleeve 31 on it to move approximately along the tie rod 17 away from the front fork upper tube 11. The rotation of the front fork sub-support 3 is relatively small. The rotation of the front fork sub-support 3 will quickly compress the shock absorber spring 32, enabling the shock absorber spring 32 to filter out minor shocks. When the vibration amplitude exceeds the elastic range of the shock absorber spring 32, the first shock absorber will take effect to compress and absorb the vibration, thereby achieving combined shock absorption and increasing riding comfort.

[0027] Meanwhile, the position of the limiting baffle 33 in the second shock absorber can be adjusted by the limiting nut 34, thereby adjusting the angle between the fork sub-bracket 3 and the fork main frame tube 15, and thus adjusting the support strength of the shock absorber spring 32 on the fork sub-bracket 3, to support people of different weights and increase adaptability.

[0028] Except for the technical features described in the specification, all other technologies are known to those skilled in the art.

[0029] In this utility model, "upper", "lower", "left", "right", "front" and "back" are relative positions used to facilitate the description of positional relationships, and therefore cannot be understood as absolute positions as a limitation on the scope of protection.

[0030] The above description is merely an example and illustration of the structure of this utility model. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the structure of the utility model or exceed the scope defined in the claims, they should all fall within the protection scope of this utility model.

Claims

1. A dual-damping front fork, characterized in that, The device includes a front fork frame, on which a first shock absorber is provided. A front fork sub-bracket is rotatably connected to the lower end of the front fork frame. A front wheel is rotatably connected to one end of the front fork sub-bracket. A second shock absorber is provided between the other end of the front fork sub-bracket and the front fork frame.

2. The dual-damping front fork according to claim 1, characterized in that, The fork frame includes a fork top tube, one end of which is fixedly connected to a fork shoulder cap, and the two ends of the fork shoulder cap are fixedly connected to two fork inner tubes. The two fork inner tubes are connected to a fork main frame tube through a first shock absorber, and the fork main frame tube is rotatably connected to a fork sub-support.

3. The dual-damping front fork according to claim 2, characterized in that, The second shock absorption device includes a sleeve mounted on the front fork sub-bracket. A limiting plate is provided at one end of the sleeve near the front fork frame. A shock absorption spring is provided inside the sleeve. A pull rod is also provided inside the sleeve, passing through the sleeve and the limiting plate. One end of the pull rod is fixedly connected to the front fork frame, and the other end of the pull rod is provided with a limiting device that is slidably connected inside the sleeve.

4. A dual-damping front fork according to claim 3, characterized in that, The limiting device includes a limiting nut, and a limiting baffle is provided between the limiting nut and the shock-absorbing spring. The limiting baffle is slidably disposed inside the limiting tube.

5. A dual-damping front fork according to claim 3, characterized in that, A fork shoulder plate is fixedly connected to the inner tube of the fork. The fork shoulder plate is fixedly connected to the upper tube of the fork by bolts. One end of the pull rod is fixedly connected to the fork shoulder plate.

6. A dual-damping front fork according to claim 2, characterized in that, The connection point between the fork main frame tube and the fork subframe is near the end of the fork subframe.

7. A dual-damping front fork according to claim 2, characterized in that, A U-shaped connector is fixedly connected to the fork sub-support. The fork main frame tube is rotatably connected to the fork sub-support through the U-shaped connector. The movement angle of the fork sub-support is limited by the U-shaped connector.

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