Front fork assembly with bi-directional damping separately adjusted

Abstract

The invention belongs to the technical field of shock absorbers, and particularly relates to a two-way damping separately-adjusted front fork assembly which comprises a first piston assembly and a second piston assembly which are rigidly and synchronously connected, each of the two piston assemblies comprises a cylinder body and a rod body which are matched, and a piston head of the rod body divides an inner cavity of the cylinder body into a compression cavity and a recovery cavity; a piston head of the first piston assembly is provided with a first flow guide hole with a first one-way valve, and fluid is limited to flow from a compression cavity to a recovery cavity during compression; a piston head of the second piston assembly is provided with a second flow guide hole with a second one-way valve, and fluid is limited to flow from the recovery cavity to the compression cavity during recovery; the rod body is provided with a runner communicating with the compression cavity and the recovery cavity and an adjusting mechanism for adjusting the opening degree of the runner. The compression damping and the recovery damping are independently controlled by the two piston assemblies respectively, interference during adjustment of the compression damping and the recovery damping is avoided, compatibility of adjustment precision and adaptability is guaranteed, the structure is simple, the cost is controllable, and the application range is wide.

Description

Technical Field

[0001] This invention belongs to the field of shock absorber technology, and particularly relates to a front fork assembly with bidirectional damping adjustment. Background Technology

[0002] Currently, the front fork assemblies used in two-wheeled electric vehicles and motorcycles typically integrate compression damping and recovery damping generation and adjustment structures within both left and right shock absorbers to achieve adjustable damping. This means both shock absorbers simultaneously possess bidirectional compression and recovery damping adjustment functions. To meet handling and strength requirements, this type of fork structure often adopts an inverted layout. Its compression and recovery damping adjustment structures are mostly integrated into the shock absorber cylinder, requiring precision machining of oil passages and valve mounting positions on the cylinder. This complex structure and relatively high machining and sealing requirements result in high overall costs and limited applicability. Furthermore, because a single shock absorber integrates both compression and recovery damping structures, the adjustments of compression and recovery damping are prone to mutual interference, making it difficult to balance adjustment accuracy and adaptability. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned technical problems by providing a front fork assembly with separate bidirectional damping adjustment, achieving the advantages of simple structure, independent bidirectional adjustment of compression and recovery damping, controllable cost, and wide applicability.

[0004] In view of this, the present invention provides a bidirectional damping separately adjustable front fork assembly, including a first piston assembly and a second piston assembly. Both the first piston assembly and the second piston assembly include a fitted cylinder and a rod. The rod includes a piston head located inside the cylinder and a spring seat located outside the cylinder. The piston head is used to divide the interior of the cylinder into a compression chamber and a recovery chamber. The first piston assembly and the second piston assembly are rigidly and synchronously connected, and can perform axial compression and recovery movements synchronously. The piston head in the first piston assembly has a first flow guide hole, and a first one-way valve is provided on the first flow guide hole. The first one-way valve is used to restrict the flow of fluid from the compression chamber to the recovery chamber when compression damping occurs. The piston head in the second piston assembly is provided with a second flow guide hole, and a second one-way valve is provided on the second flow guide hole. The second one-way valve is used to restrict the flow of fluid from the recovery chamber to the compression chamber when the damping is restored. The rod body is also provided with a flow channel and an adjustment mechanism for adjusting the opening of the flow channel. The two ends of the flow channel are respectively connected to the compression chamber and the recovery chamber.

[0005] In the above technical solution, further: The rod also includes a connector for mounting and securing the piston head; The flow channel is located inside the connector and includes axial and radial holes that communicate with each other.

[0006] In the above technical solution, further: Multiple first and second guide holes are provided along the circumference; The first one-way valve includes a first retaining ring and a first wave-shaped washer, wherein the first retaining ring completely covers a plurality of first flow guide holes, and the first wave-shaped washer is used to move the first retaining ring closer to or away from the piston head under the action of fluid. The second check valve includes a second retaining ring and a second wave-shaped washer. The second retaining ring completely covers multiple second guide holes, while the second wave-shaped washer is used to move the second retaining ring closer to or away from the piston head under the action of fluid.

[0007] In the above technical solution, further: The rod body has a first sliding hole along the axial direction, and the first sliding hole is arranged coaxially with the axial hole; The adjustment mechanism includes a pin and a drive unit. One end of the pin is connected to the output end of the drive unit, and the other end extends out of the first sliding hole and is inserted into the axial hole to change the opening of the axial hole under the drive of the drive unit.

[0008] In the above technical solution, the driving component further includes: The connecting block is coaxially connected to one end of the rod body located at the spring seat, and has a threaded hole and a second sliding hole that communicate with the first sliding hole in the axial direction; The drive motor is installed on the side of the connecting block away from the cylinder body, and its output end extends into the second sliding hole; The connecting post is connected to the ejector pin at one end and threaded into the threaded hole at the other end, and slidably connected to the output shaft of the drive motor at the other end; The diameter of the threaded hole is smaller than the diameter of the second sliding hole.

[0009] In the above technical solution, the adjusting mechanism further includes: The cylinder is fitted onto the drive motor, with one end connected to the connecting block and the other end connected to an end cap; The end cap has a limiting protrusion, and the drive motor surface has a limiting groove that matches the limiting protrusion. A countersunk hole is also provided on the end cap surface.

[0010] In the above technical solution, both the first piston assembly and the second piston assembly further include: The outer tube is fitted onto the cylinder body, with one end connected to the cylinder body and having a connecting end; The sleeve has one end extending into the inner wall of the outer tube and slidingly connected to it, and the other end extending out of the outer tube and connecting to the end cap. The spring is installed inside the outer tube, with its two ends abutting against the connecting end and the spring seat, respectively.

[0011] In the above technical solution, further: The first piston assembly and the second piston assembly both have a first through hole on the inner wall of their compression chambers. A second through hole is provided on the inner wall of the recovery chamber of the first piston assembly; The cylinder of the first piston assembly is provided with a fixed block, and a third guide hole is provided on the fixed block. A third one-way valve is provided on the third guide hole. The third one-way valve is used to restrict the flow of fluid from the compression chamber to the outside of the cylinder.

[0012] In the above technical solution, further: The third guide hole has multiple openings around its circumference; The third check valve includes a third retaining ring and a third wave-shaped washer. The third retaining ring completely covers multiple third flow guide holes, while the third wave-shaped washer is used to move the third retaining ring closer to or further away from the fixed block under the action of fluid.

[0013] In the above technical solution, further: The spring seat includes a baffle sleeved on the rod and an adjusting nut threaded onto the rod; The baffle is located between the spring and the adjusting nut.

[0014] The beneficial effects of this invention are as follows: 1. By controlling the compression damping and the recovery damping separately with two piston assemblies, one piston is used to adjust the compression damping without affecting the recovery damping, and the other piston assembly is used to adjust the recovery damping without affecting the compression damping. Therefore, adjusting one damping avoids affecting the other, realizing separate and independent adjustment of the compression and recovery damping, greatly reducing the possibility of mutual interference between the two damping directions, and ensuring adjustment accuracy and compatibility.

[0015] 2. The damping adjustment channel and adjustment mechanism are integrated on the rod body, eliminating the need to machine complex and precise oil circuits and valve system mounting positions on the cylinder body. This avoids the inherent defects of existing inverted adjustable front fork cylinder bodies, which are difficult to machine and have high sealing requirements. It is widely used in ordinary commuter two-wheeled electric vehicles and motorcycles, with a wide range of applications.

[0016] 3. The throttling adjustment structure with a conical pin enables linear stepless adjustment of damping with higher precision; the matching electric drive adjustment mechanism enables precise electronic control adjustment of damping, supports linkage with the vehicle's infotainment system, and enables one-click switching of preset damping modes, perfectly adapting to the upgrade needs of intelligent vehicles. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3This is the present invention. Figure 2 Sectional view at point AA; Figure 4 This is the present invention. Figure 3 Enlarged view of point B in the middle; Figure 5 This is the present invention. Figure 3 Enlarged view of point C in the middle; Figure 6 This is the present invention. Figure 3 Enlarged view at point D; Figure 7 This is the present invention. Figure 3 Enlarged view at point E in the middle; Figure 8 This is the present invention. Figure 3 Enlarged view at point F; The markings in the diagram represent: 1. Cylinder body; 2. Rod body; 20. Piston head; 21. Spring seat; 210. Adjusting nut; 211. Baffle; 22. First guide hole; 23. First check valve; 230. First retaining ring; 231. First wave washer; 24. Second guide hole; 25. Second check valve; 250. Second retaining ring; 251. Second wave washer; 26. Connector; 27. First sliding hole; 3. Compression chamber; 4. Recovery chamber; 5. Flow channel; 50. Axial hole; 51. Radial hole; 6. Adjustment. Mechanism; 60, ejector pin; 61, driving component; 610, connecting block; 611, threaded hole; 612, second sliding hole; 613, drive motor; 614, connecting column; 62, cylinder; 63, end cap; 64, limiting protrusion; 65, limiting groove; 66, countersunk hole; 7, outer tube; 70, connecting end; 8, sleeve; 9, spring; 10, first through hole; 11, second through hole; 12, fixing block; 13, third guide hole; 14, third one-way valve; 140, third retaining ring; 141, third wave washer. Detailed Implementation

[0018] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application are within the scope of protection of this application.

[0019] Example 1: This embodiment provides a bidirectional damping separately adjustable front fork assembly, including a first piston assembly and a second piston assembly. Both the first piston assembly and the second piston assembly include a matching cylinder 1 and a rod 2. The rod 2 includes a piston head 20 located inside the cylinder 1 and a spring seat 21 located outside the cylinder 1. The piston head 20 is used to divide the interior of the cylinder 1 into a compression chamber 3 and a recovery chamber 4. The first piston assembly and the second piston assembly are rigidly and synchronously connected, and can perform axial compression and recovery movements synchronously. The piston head 20 in the first piston assembly is provided with a first guide hole 22, and a first one-way valve 23 is provided on the first guide hole 22. The first one-way valve 23 is used to restrict the flow of fluid from the compression chamber 3 to the recovery chamber 4 when compression damping occurs. The piston head 20 in the second piston assembly is provided with a second guide hole 24, and a second one-way valve 25 is provided on the second guide hole 24. The second one-way valve 25 is used to restrict the flow of fluid from the recovery chamber 4 to the compression chamber 3 when the damping is restored. The rod body 2 is also provided with a flow channel 5 and an adjustment mechanism 6 for adjusting the opening of the flow channel 5. The two ends of the flow channel 5 are respectively connected to the compression chamber 3 and the recovery chamber 4. The fork assembly also includes a connecting plate and a seat tube, and the lower end of the cylinder 1 of the two piston assemblies is rigidly fixed by the front wheel axle, and the upper end of the rod 2 is rigidly fixed by the connecting plate, thus achieving a rigid synchronous connection. This is a conventional structure of conventional upright fork assemblies, which is known to those skilled in the art from traditional upright fork assemblies, and will not be elaborated here. Meanwhile, sliding seal connections are used between cylinder 1 and rod 2, and between piston head 20 and inner wall of cylinder 1.

[0020] As can be seen from this embodiment, by opening guide holes in the piston heads 20 of the two piston assemblies of the front fork assembly, and by independently controlling the flow direction of the damping fluid in the two piston assemblies through the first one-way valve 23 and the second one-way valve 25 respectively, and combining this with the adjustment mechanism 6 set on the rod body 2; Furthermore, during compression, the flow of the first guide hole 22 in the first piston assembly is restricted. The opening of the flow channel 5 in the corresponding rod body 2 is adjusted to adjust the compression damping. During this process, the second guide hole 24 in the second piston assembly is opened, resulting in a large difference in the compression damping of the two piston assemblies. Similarly, during the recovery process, the flow of the second guide hole 24 in the second piston assembly is restricted. The opening of the flow channel 5 in the corresponding rod body 2 is adjusted to adjust the recovery damping. During this process, the first guide hole 22 in the first piston assembly is opened, resulting in a large difference in the recovery damping of the two piston assemblies. Therefore, during compression and recovery, the damping difference between the two is amplified, so that the damping adjustment in the two directions of compression and rebound is completely independent and does not interfere with each other. This avoids the effect of adjusting one damping on the other, realizing separate and independent adjustment of the two-way damping of compression and recovery, greatly reducing the possibility of mutual interference between the two directions of damping, and ensuring adjustment accuracy and compatibility. Furthermore, the adjustment mechanism 6 is set on the rod body 2, which means that the upright front fork assembly is adopted, which effectively reduces the structural complexity, and the requirements for processing and sealing are relatively low, the cost is controllable, and the applicability range is improved.

[0021] Example 2: This embodiment provides a front fork assembly with separate bidirectional damping adjustment, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The rod body 2 also includes a connector 26 for mounting and fixing the piston head 20; The flow channel 5 is formed inside the connector 26 and includes an axial hole 50 and a radial hole 51 that are interconnected. Meanwhile, multiple radial holes 51 can be opened and arranged at equal intervals around the circumference.

[0022] As can be seen from this embodiment, the connection head 26 facilitates the installation of the piston head 20 and the opening of the flow channel 5, thereby reducing manufacturing costs. Furthermore, the flow channel 5 adopts a combination of axial holes 50 and radial holes 51, which not only facilitates processing but also makes it easy to adjust the opening of the flow channel 5 in the future. The radial holes 51 arranged at equal intervals around the circumference can ensure uniform flow of damping fluid, avoid radial off-center load on piston head 20, reduce wear between piston head 20 and inner wall of cylinder 1, and extend the service life of parts.

[0023] Example 3: This embodiment provides a front fork assembly with separate bidirectional damping adjustment, which, in addition to the technical solutions of the above embodiments, also has the following technical features: Multiple first guide holes 22 and second guide holes 24 are provided along the circumference; The first one-way valve 23 includes a first retaining ring 230 and a first wave-shaped washer 231. The first retaining ring 230 completely covers the multiple first guide holes 22, while the first wave-shaped washer 231 is used to move the first retaining ring 230 closer to or further away from the piston head 20 under the action of fluid. Specifically, the first wave-shaped washer 231 is used to provide preload for the first retaining ring 230. During the compression stroke, the fluid pressure in the compression chamber 3 pushes the first retaining ring 230 closer to the piston head 20, closing the first guide holes 22. During the return stroke, the fluid pressure in the return chamber 4 pushes the first retaining ring 230 to compress the first wave-shaped washer 231, moving it away from the piston head 20 and opening the first guide holes 22. The second one-way valve 25 includes a second retaining ring 250 and a second wave-shaped washer 251. The second retaining ring 250 completely covers the plurality of second guide holes 24, while the second wave-shaped washer 251 is used to move the second retaining ring 250 closer to or further away from the piston head 20 under the action of fluid. Specifically, the second wave washer 251 is used to provide preload for the second retaining ring 250. During the recovery stroke, the fluid pressure in the recovery chamber 4 pushes the second retaining ring 250 closer to the piston head 20, closing the second guide hole 24. During the compression stroke, the fluid pressure in the compression chamber 3 pushes the second retaining ring 250 to compress the second wave washer 251, moving it away from the piston head 20 and opening the second guide hole 24. In this design, the piston head 20 of the first piston assembly is located on the side of the first guide hole 22 near the first retaining ring 230, and the piston head 20 of the second piston assembly is located on the side of the second guide hole 24 near the second retaining ring 250. Both annular grooves are provided to connect the multiple first guide holes 22 to each other and the multiple second guide holes 24 to each other. The two annular grooves are also completely covered by the first retaining ring 230 and the second retaining ring 250, respectively.

[0024] As can be seen from this embodiment, by using retaining rings and wave washers and setting their specific positions, the piston head 20 can be driven to move, and with the help of fluid, the retaining rings can be pushed in different directions, thereby opening and closing the guide holes. This increases the damping difference between the two components during compression or recovery, thus accurately achieving individual control of damping in a single stroke. This further amplifies the damping difference between the two piston components in the corresponding stroke, avoiding the mutual influence of damping in the compression and rebound directions. Moreover, the retaining rings and wave washers are easy to install, have a simple structure, and are inexpensive. The opening of the annular groove can prevent the fluid from being affected by the overall or partial blockage of a single guide hole, thus ensuring the reliability of the one-way valve opening and closing and the stability of the damping characteristics, and preventing damping failure due to blockage of the guide hole. Multiple first guide holes 22 and second guide holes 24 are opened along the circumference to ensure the uniformity of the flow of damping fluid in the radial section, ensure uniform circumferential force on piston head 20, avoid uneven wear between piston head 20 and inner wall of cylinder 1, and extend service life of shock absorber.

[0025] Example 4: This embodiment provides a front fork assembly with separate bidirectional damping adjustment, which, in addition to the technical solutions of the above embodiments, also has the following technical features: A first sliding hole 27 is provided in the rod body 2 along the axial direction, and the first sliding hole 27 is arranged coaxially with the axial hole 50; The adjustment mechanism 6 includes a pin 60 and a drive member 61. One end of the pin 60 is connected to the output end of the drive member 61, and the other end extends out of the first sliding hole 27 under the drive of the drive member 61 and is inserted into the axial hole 50 to change the opening of the axial hole 50. The end of the ejector pin 60 that is furthest from the drive component 61 is conical.

[0026] As can be seen from this embodiment, by opening a first sliding hole 27 coaxial with the axial hole 50 in the rod body 2, and sliding a conical ejector pin 60 with a connecting end 70 in the first sliding hole 27, the conical end of the ejector pin 60 can be moved closer to or further away from the axial hole 50 under the drive of the drive member 61. Thus, the opening of the axial hole 50 can be changed at different moving distances, thereby changing the opening of the flow channel 5. Therefore, most of the components of the adjustment mechanism 6 can be arranged at the end of the rod body 2 away from the cylinder body 1, avoiding excessive changes to the structure of the cylinder body 1 and the rod body 2, ensuring structural strength, and avoiding excessive impact on the sealing performance of the cylinder body 1. Moreover, the force on the rod body 2 is mostly axial force, so the opening of the first sliding hole 27 can ensure the structural strength of the rod body 2 as much as possible. Furthermore, it is only necessary to extend the ejector pin 60 to the piston head 20 side, which makes the installation of the adjustment mechanism 6 more convenient and reduces manufacturing costs.

[0027] Example 5: This embodiment provides a front fork assembly with bidirectional damping separate adjustment. In addition to the technical solutions of the above embodiments, it also has the following technical features, wherein the drive component 61 includes: The connecting block 610 is coaxially connected to one end of the rod body 2 located at the spring seat 21, and is axially provided with a threaded hole 611 and a second sliding hole 612 that communicate with the first sliding hole 27; The drive motor 613 is installed on the side of the connecting block 610 away from the cylinder 1, and its output end extends into the second sliding hole 612; The connecting post 614 is connected at one end to the ejector pin 60 and threaded to the threaded hole 611, and at the other end to the output shaft of the drive motor 613 and slidably connected to the second sliding hole 612; The diameter of the threaded hole 611 is smaller than the diameter of the second sliding hole 612; Meanwhile, the specific structure and type of the drive motor 613 can be selected and used by those skilled in the art. As long as it can realize the forward and reverse rotation of the connecting column 614, this application does not limit it. The output end of the drive motor 613 and the connecting column 614 can adopt conventional structures such as spline insertion and flat shaft insertion to realize the functions of circumferential limiting and axial sliding. The length of the overlapping part of the output end and the connecting column 614 along the axial direction should be greater than the length of the maximum displacement of the connecting column 614. Furthermore, a sealing ring is fitted on the surface of the connecting post 614, and the rod body 2 and the connecting block 610 can be connected by a thread or an interference fit; The drive motor 613 is a mature existing technology. Its specific structure and type are designed to enable forward and reverse rotation control of the connecting column 614. Those skilled in the art can select the appropriate type of motor from the traditional drive motor 613 and apply it to this application. This application does not limit the specific structure and type.

[0028] As can be seen from this embodiment, by using a drive motor 613 to drive the connecting post 614 to rotate circumferentially, and then through the threaded connection between the connecting post 614 and the threaded hole 611, the connecting post 614 is driven to make axial displacement, which in turn pushes the ejector pin 60 to make axial displacement. Thus, when its conical end approaches or moves away from the axial hole 50, the opening of the axial hole 50 is changed, thereby realizing the adjustment of the opening of the flow channel 5. The driving method is simple and effectively reduces manufacturing costs. Furthermore, by making the diameter of the threaded hole 611 smaller than that of the second sliding hole 612, the maximum displacement of the connecting post 614 is limited. A shoulder limit is formed between the threaded hole 611 and the second sliding hole 612, which can prevent the ejector pin 60 from being over-inserted, causing the flow channel 5 to be completely blocked and the ejector pin 60 to get stuck. At the same time, it can prevent the connecting post 614 from disengaging from the output end of the drive motor 613, thus ensuring the stability of the reciprocating drive. The electric adjustment structure can be linked with the vehicle's infotainment system, supporting one-click switching of preset damping modes. It can quickly adapt to different driving conditions such as commuting, off-roading, and cornering, improving the product's intelligence level and ease of use. The related control technologies of vehicle-machine linkage and preset damping modes are existing mature technologies in the field of electric shock absorption for two-wheeled vehicles. Those skilled in the art can routinely select and apply them to this application according to their needs, and this application does not limit them.

[0029] Example 6: This embodiment provides a front fork assembly with separate bidirectional damping adjustment. In addition to the technical solutions of the above embodiments, it also has the following technical features: the adjustment mechanism 6 further includes: The cylinder 62 is sleeved on the drive motor 613, and one end is connected to the connecting block 610, while the other end is connected to the end cap 63. The end cap 63 is provided with a limiting protrusion 64, and the drive motor 613 is provided with a limiting groove 65 that is adapted to the limiting protrusion 64, and a countersunk hole 66 is provided on the surface of the end cap 63. Meanwhile, the cylinder 62 and the connecting block 610, as well as the cylinder 62 and the end cap 63, are all connected by threads. The limiting protrusion 64 and the end cap 63 are integrated. The limiting groove 65 is specifically formed on the housing surface of the drive motor 613, which is adapted to the limiting protrusion 64. This is a conventional processing method for those skilled in the art. Only the housing of the conventional drive motor 613 needs to be adapted to apply the modified conventional drive motor 613 to this application. It will not be described in detail here.

[0030] As can be seen from this embodiment, the cylindrical body 62 and the end cap 63 provide a certain degree of protection for the drive motor 613. The limiting protrusion 64 and the limiting groove 65 restrict the rotation of the drive motor 613, preventing the drive motor 613 from rotating due to frictional resistance between the connecting post 614 and the threaded hole 611, thus ensuring the stable installation of the drive motor 613. Furthermore, the threaded connection between the end cap 63 and the cylinder 62, as well as the countersunk hole 66 on the end cap 63, allows for easy disassembly of the end cap 63 by inserting a tool into the countersunk hole 66 for leverage. This enables non-professionals to disassemble the drive motor 613 without disassembling the internal structure of the piston assembly, thereby facilitating the maintenance and replacement of the drive motor 613 and extending its service life.

[0031] Example 7: This embodiment provides a front fork assembly with separate bidirectional damping adjustment. In addition to the technical solutions of the above embodiments, it also has the following technical features: both the first piston assembly and the second piston assembly further include: The outer tube 7 is sleeved on the cylinder body 1, and one end is connected to the cylinder body 1 and is provided with a connecting end 70; Sleeve 8 has one end extending into the inner wall of the outer tube 7 and slidingly connected to it, and the other end extending out of the outer tube 7 and connected to the end cap 63. Spring 9 is installed inside outer tube 7, and its two ends abut against connecting end 70 and spring seat 21 respectively; Among them, the sleeve 8 and the outer tube 7 are connected by a sliding seal, and the sleeve 8 and the end cap 63 can be connected by a thread, and the diameter of the end cap 63 corresponding to the end of the sleeve 8 is larger than the diameter of the end cap 63 corresponding to the end of the cylinder 62. Meanwhile, a sealing ring is also fitted on the radial surface of the end cap 63 for sealing connection between the end cap 63 and the sleeve 8.

[0032] As can be seen from this embodiment, by setting the outer tube 7 and the sleeve 8, the spring 9 can be installed inside, thereby providing a good protective effect on the spring 9, preventing mud, sand and gravel from directly impacting the spring 9, preventing the spring 9 from rusting and fatigue damage, and effectively extending the service life of the spring 9. Meanwhile, the closed structure of the cylinder 62 and the end cap 63 effectively isolates rainwater, mud, and dust from eroding the drive motor 613, greatly improving the service life of the drive mechanism and its adaptability to complex environments.

[0033] Example 8: This embodiment provides a front fork assembly with separate bidirectional damping adjustment, which, in addition to the technical solutions of the above embodiments, also has the following technical features: First through holes 10 are provided on the inner walls of the compression chambers 3 of the first piston assembly and the second piston assembly. A second through hole 11 is provided on the inner wall of the recovery chamber 4 of the first piston assembly; The cylinder 1 of the first piston assembly is provided with a fixing block 12, and a third guide hole 13 is provided on the fixing block 12. A third one-way valve 14 is provided on the third guide hole 13. The third one-way valve 14 is used to restrict the flow of fluid from the compression chamber 3 to the outside of the cylinder 1. Among them, a sealing ring is provided between the fixing block 12 and the inner wall of the cylinder body 1, and is fixedly connected to the end of the cylinder body 1; At the same time, the outer pipe 7 and the surface of the cylinder 1 form an annular oil storage cavity.

[0034] As can be seen from this embodiment, by opening a first through hole 10 in the inner wall of the compression chamber 3 of the first piston assembly and a second through hole 11 in the inside of the recovery chamber 4, and by setting a third one-way valve 14 in the cylinder body 1 to restrict the flow of fluid from the compression chamber 3 to the outside of the cylinder body 1, the damping fluid in the compression chamber 3 can flow through the flow channel 5 when the first piston assembly is dealing with compression damping, so that the magnitude of compression damping can be adjusted by adjusting the opening of the flow channel 5. Conversely, during recovery, the third one-way valve 14 and the first one-way valve 23 are connected, so that the damping fluid can not only enter the compression chamber 3 from the recovery chamber 4 through the first guide hole 22, but also enter the compression chamber 3 from the second through hole 11 through the annular oil storage chamber and the first through hole 10, thereby reducing the recovery damping of the first piston assembly. The second piston assembly has a first through hole 10. During compression damping, the second one-way valve 25 is open, and the damping fluid in the compression chamber 3 can flow through the second one-way valve 25, the flow channel 5, and the first through hole 10 to reduce the compression damping of the second piston assembly. During recovery, the second one-way valve 25 is closed, and the second through hole 11 is not opened in its recovery chamber 4. Therefore, the damping fluid in the recovery chamber 4 can only flow through the flow channel 5, which makes it easy to adjust the magnitude of the recovery damping by adjusting the opening of the flow channel 5. Therefore, by adjusting the compression damping of the first piston assembly and minimizing the recovery damping, and by adjusting the recovery damping of the second piston assembly and minimizing the compression damping, the difference in compression damping and recovery damping between the first and second piston assemblies is increased. This allows for completely independent adjustment of the compression and recovery damping, eliminating the interference between the damping in the two directions. When achieving bidirectional damping adjustment, the first piston assembly dominates the compression damping, while the second piston assembly dominates the recovery damping. The damping adjustments in the two directions do not affect each other, improving the accuracy of damping adjustment and adapting to more different riding scenarios.

[0035] Example 9: This embodiment provides a front fork assembly with separate bidirectional damping adjustment, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The third guide hole 13 has multiple openings around its circumference; The third one-way valve 14 includes a third retaining ring 140 and a third wave-shaped washer 141. The third retaining ring 140 completely covers the plurality of third guide holes 13, while the third wave-shaped washer 141 is used to move the third retaining ring 140 closer to or further away from the fixed block 12 under the action of fluid.

[0036] As can be seen from this embodiment, by using the third retaining ring 140 and the third wave washer 141 for the third one-way valve 14, the structure is simple and it is easy to achieve one-way conduction under the action of fluid. This ensures that when the first piston assembly is compressed, the compression chamber 3 generates adjustable damping. When it is restored, oil is replenished through the annular oil storage chamber, which avoids the compression chamber 3 from generating negative pressure and forming additional uncontrollable restoration damping. This avoids reducing the difference in restoration damping between the two piston assemblies and interfering with the independent adjustment of the restoration damping of the second piston assembly. The opening pressure can be adjusted by replacing the waveform washers with different stiffnesses to adapt to the usage requirements of different working conditions.

[0037] Example 10: This embodiment provides a front fork assembly with separate bidirectional damping adjustment, which, in addition to the technical solutions of the above embodiments, also has the following technical features: The spring seat 21 includes a baffle 211 sleeved on the rod body 2 and an adjusting nut 210 threadedly connected to the rod body 2; Among them, the baffle 211 is located between the spring 9 and the adjusting nut 210.

[0038] As can be seen from this embodiment, by using a baffle 211 and an adjusting nut 210 to set the spring seat 21, the position of the baffle 211 on the rod 2 can be controlled by adjusting the position of the adjusting nut 210 on the rod 2, thereby adjusting the preload of the spring 9. This achieves stepless adjustment of the preload of the spring 9, adapting to the fork preload requirements under different loads and working conditions, and improving the adaptability and riding comfort of the fork assembly.

[0039] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of this application can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A bidirectional damping separately adjustable front fork assembly, comprising a first piston assembly and a second piston assembly, both the first piston assembly and the second piston assembly comprising a fitted cylinder (1) and a rod (2), the rod (2) comprising a piston head (20) located inside the cylinder (1) and a spring seat (21) located outside the cylinder (1), the piston head (20) being used to divide the interior of the cylinder (1) into a compression chamber (3) and a recovery chamber (4), characterized in that: The first piston assembly and the second piston assembly are rigidly and synchronously connected, and can perform axial compression and recovery movements synchronously. The piston head (20) in the first piston assembly is provided with a first guide hole (22), and a first one-way valve (23) is provided on the first guide hole (22). The first one-way valve (23) is used to restrict the flow of fluid from the compression chamber (3) to the recovery chamber (4) when compression damping occurs. The piston head (20) in the second piston assembly is provided with a second guide hole (24), and a second one-way valve (25) is provided on the second guide hole (24). The second one-way valve (25) is used to restrict the flow of fluid from the recovery chamber (4) to the compression chamber (3) when the damping is restored. The rod (2) is also provided with a flow channel (5) and an adjustment mechanism (6) for adjusting the opening of the flow channel (5). The two ends of the flow channel (5) are respectively connected to the compression chamber (3) and the recovery chamber (4).

2. The bidirectional damping separately adjustable front fork assembly according to claim 1, characterized in that: The rod (2) also includes a connector (26) for mounting and fixing the piston head (20); The flow channel (5) is formed inside the connector (26) and includes an axial hole (50) and a radial hole (51) that are interconnected.

3. The bidirectional damping separately adjustable front fork assembly according to claim 2, characterized in that: The first guide hole (22) and the second guide hole (24) are both provided with multiple holes along the circumference; The first one-way valve (23) includes a first retaining ring (230) and a first wave-shaped washer (231), and the first retaining ring (230) completely covers the multiple first guide holes (22), while the first wave-shaped washer (231) is used to move the first retaining ring (230) closer to or further away from the piston head (20) under the action of fluid; The second one-way valve (25) includes a second retaining ring (250) and a second wave gasket (251), wherein the second retaining ring (250) completely covers a plurality of second guide holes (24), and the second wave gasket (251) is used to move the second retaining ring (250) closer to or away from the piston head (20) under the action of fluid.

4. The bidirectional damping separately adjustable fork assembly according to claim 2, characterized in that: The rod body (2) has a first sliding hole (27) axially arranged inside, and the first sliding hole (27) is coaxially arranged with the axial hole (50); The adjustment mechanism (6) includes a pin (60) and a drive (61). One end of the pin (60) is connected to the output end of the drive (61), and the other end extends out of the first sliding hole (27) and is inserted into the axial hole (50) under the drive of the drive (61) to change the opening of the axial hole (50).

5. The bidirectional damping separately adjustable fork assembly according to claim 4, characterized in that, The drive unit (61) includes: The connecting block (610) is coaxially connected to one end of the rod body (2) located at the spring seat (21), and has a threaded hole (611) and a second sliding hole (612) that communicate with the first sliding hole (27) in the axial direction. The drive motor (613) is installed on the side of the connecting block (610) away from the cylinder (1), and its output end extends into the second sliding hole (612); The connecting post (614) is connected at one end to the ejector pin (60) and threaded to the threaded hole (611), and at the other end to the output shaft of the drive motor (613) and slidably connected to the second sliding hole (612); The diameter of the threaded hole (611) is smaller than the diameter of the second sliding hole (612).

6. The bidirectional damping separately adjustable fork assembly according to claim 5, characterized in that, The adjustment mechanism (6) further includes: The cylinder (62) is fitted onto the drive motor (613), and one end is connected to the connecting block (610), while the other end is connected to the end cap (63). The end cap (63) is provided with a limiting protrusion (64), and a limiting groove (65) adapted to the limiting protrusion (64) is provided on the surface of the drive motor (613), and a countersunk hole (66) is provided on the surface of the end cap (63).

7. The bidirectional damping separately adjustable front fork assembly according to claim 6, characterized in that, Both the first piston assembly and the second piston assembly also include: The outer tube (7) is fitted onto the cylinder body (1), and one end is connected to the cylinder body (1) and is provided with a connecting end (70). The sleeve (8) extends into the inner wall of the outer tube (7) and is slidably connected thereto; the other end extends out of the outer tube (7) and is connected to the end cap (63). The spring (9) is installed inside the outer tube (7), and its two ends abut against the connecting end (70) and the spring seat (21) respectively.

8. The bidirectional damping separately adjustable fork assembly according to claim 7, characterized in that: The first piston assembly and the second piston assembly each have a first through hole (10) on the inner wall of the compression chamber (3). A second through hole (11) is provided on the inner wall of the recovery chamber (4) of the first piston assembly. The cylinder (1) of the first piston assembly is provided with a fixing block (12), and a third guide hole (13) is provided on the fixing block (12). A third one-way valve (14) is provided on the third guide hole (13). The third one-way valve (14) is used to restrict the fluid from flowing from the compression chamber (3) to the outside of the cylinder (1).

9. The bidirectional damping separately adjustable front fork assembly according to claim 8, characterized in that: The third guide hole (13) has multiple openings around its circumference; The third one-way valve (14) includes a third retaining ring (140) and a third wave gasket (141), and the third retaining ring (140) completely covers the multiple third guide holes (13), while the third wave gasket (141) is used to move the third retaining ring (140) closer to or further away from the fixed block (12) under the action of the fluid.

10. The bidirectional damping separately adjustable front fork assembly according to claim 1, characterized in that: The spring seat (21) includes a baffle (211) sleeved on the rod (2) and an adjusting nut (210) threaded onto the rod (2). The baffle (211) is located between the spring (9) and the adjusting nut (210).

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