Compression damping continuously adjustable damping device based on quasi-zero stiffness and damping method

Abstract

The application relates to a compression damping continuously adjustable damping device based on quasi-zero stiffness and a damping method, which comprises a damping outer cylinder and a damping inner cylinder which are nested with each other, a hollow piston rod movably sleeved in the damping inner cylinder, a bearing spring which is sleeved on the damping outer cylinder and the damping inner cylinder in cooperation, and a positive stiffness mechanism which is the bearing spring; a negative stiffness mechanism is arranged in the damping inner cylinder, the negative stiffness mechanism comprises a ball which is arranged at one end of the hollow piston rod extending into the damping inner cylinder and an inner convex rubber ring which is arranged on the inner wall of the damping inner cylinder; the inner diameter of the inner convex rubber ring is reduced in the middle section to form a neck part, the inner diameter of the neck part is smaller than the diameter of the ball, the positive stiffness mechanism and the negative stiffness mechanism are connected in parallel, and the damping device is in a quasi-zero stiffness vibration isolation state. The damping device has the quasi-zero stiffness characteristic after being loaded by adjusting a preloading adjusting ring. Meanwhile, a rotary damping adjusting nut can realize continuous adjustment of the damping of the damping device.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of damping devices, in particular to a compression damping continuous adjustable damping device based on quasi-zero stiffness and a damping method. BACKGROUND

[0002] During driving, a motorcycle will vibrate due to uneven road surface and the working of the motorcycle engine, which is not conducive to the motorcycle driver.

[0003] A motorcycle damper with a buffering function can relieve the vibration of the motorcycle, but the common motorcycle damper on the market has poor low-frequency and ultra-low-frequency damping performance; the damper with a damping adjustment function can only adjust the damping gear in an intermittent manner. Meanwhile, the damper has a complex manufacturing process, high production cost and needs to be improved in use experience. SUMMARY

[0004] In view of the above-mentioned deficiencies of the existing motorcycle damping device, the application provides a compression damping continuous adjustable damping device based on quasi-zero stiffness and a damping method, which can effectively suppress low-frequency vibration, realize continuous damping adjustment and improve the overall comfort and safety of the motorcycle during driving.

[0005] The technical scheme adopted by the application is as follows:

[0006] A compression damping continuous adjustable damping device based on quasi-zero stiffness comprises a damping outer cylinder and a damping inner cylinder which are nested with each other, a hollow piston rod is movably arranged in the damping inner cylinder, a bearing spring is arranged outside the damping outer cylinder and the damping inner cylinder in cooperation, and the bearing spring serves as a positive stiffness mechanism of the damping device; a negative stiffness mechanism is arranged in the damping inner cylinder, and the negative stiffness mechanism comprises: a ball body which is arranged at one end of the hollow piston rod extending into the damping inner cylinder; an inner convex rubber ring which is arranged on the inner wall of the damping inner cylinder; the inner diameter of the inner convex rubber ring is reduced in the middle section to form a neck part, and the inner diameter of the neck part is smaller than the diameter of the ball body; the positive stiffness mechanism and the negative stiffness mechanism are connected in parallel, so that the damping device is in a quasi-zero stiffness vibration isolation state.

[0007] Further improvement of the above technical scheme is as follows:

[0008] The damping outer cylinder and the damping inner cylinder are closed and nested, and a piston plug body on the hollow piston rod is arranged to slide on the inner wall of the damping inner cylinder; the piston plug body divides the damping inner cylinder into two regions, namely an upper oil cavity and a lower oil cavity, and the two regions are connected through the inner cavity of the hollow piston rod, an upper oil hole and a lower oil hole on the hollow piston rod.

[0009] Axial ends of the piston plug body are respectively provided with an upper ring valve plate group and a lower ring valve plate group, and the lower ring valve plate group is tightly and fixedly provided with a fixed nut on the side away from the piston plug body.

[0010] The hollow piston rod is further sleeved with a sealing assembly abutting against the inner top end of the damping inner cylinder, which comprises a first flat gasket in contact with the inner top end of the damping inner cylinder, an oil seal ring on the side of the first flat gasket away from the inner top end of the damping inner cylinder, and a second flat gasket on the side of the oil seal ring away from the first flat gasket.

[0011] The second flat gasket is sleeved with a buffer spring between the valve piece gasket.

[0012] The outer diameter of the top rod is connected with a damping adjusting nut at one end close to the dust cover, and the damping adjusting nut and the top rod axially move relative to each other to adjust the contact area between the side wall of the lower end of the top rod and the U-shaped valve piece.

[0013] The hollow piston rod is sleeved with a top rod, and the inner cavity of the hollow piston rod is installed with a U-shaped valve piece at one end close to the piston plug body, and the top rod is sleeved with a damping adjusting nut at the end away from the piston plug body.

[0014] The outer wall of the damping outer cylinder is provided with a pre-load adjusting ring, the top of the hollow piston rod is connected with an upper joint, and the two ends of the bearing spring are tightly abutted against the pre-load adjusting ring and the end face of the upper joint, respectively.

[0015] A damping method of a compression damping continuous adjustable damping device based on quasi-zero stiffness, comprising the following steps:

[0016] When the upper mounting ring at the top of the damping device is loaded, the hollow piston rod and the damping inner cylinder move relative to each other, and the hollow piston rod moves downward relative to the damping inner cylinder; during the downward movement of the hollow piston rod relative to the damping inner cylinder, when the ball at the lower end of the hollow piston rod contacts the inner convex rubber ring in the damping inner cylinder, a relative force is generated between the ball and the inner convex rubber ring; when the ball continues to move towards the neck of the inner convex rubber ring, the above-mentioned relative force increases, and when the ball moves to the axial half depth of the inner convex rubber ring, the contact between the inner convex rubber ring and the ball has a negative stiffness characteristic; the bearing spring provides positive stiffness during deformation under load, and is connected in parallel with the mechanism providing negative stiffness, thereby forming a new damping device with quasi-zero stiffness characteristics, and further proposing a quasi-zero stiffness low-frequency damping method.

[0017] As a further improvement of the above technical solution:

[0018] The contact area between the U-shaped valve piece and the side wall of the lower end of the top rod is adjusted as follows:

[0019] The rotation damping adjusting nut converts the rotation of the damping adjusting nut into axial movement of the top rod through a threaded structure; when the top rod advances towards one end of the ball, the contact area between the U-shaped valve plate and the lower end sidewall of the top rod becomes larger; when the contact area becomes larger, the pressure required for the oil to pass through the oil supply hole becomes larger, resulting in larger compression damping; when the top rod retracts away from one end of the ball, the contact area between the U-shaped valve plate and the lower end sidewall of the top rod becomes smaller; when the contact area becomes smaller, the pressure required for the oil to pass through the oil supply hole becomes smaller, resulting in smaller compression damping.

[0020] The beneficial effects of the present application are as follows:

[0021] Compared with the conventional motorcycle damping device, the present application additionally provides an inner convex rubber ring, a ball and a bearing spring to form a quasi-zero stiffness mechanism. During the driving of the motorcycle, the quasi-zero stiffness mechanism can reduce the initial vibration isolation frequency of the damping device, widen the effective vibration isolation band of the damping device and improve the comfort and safety of the driving of the motorcycle.

[0022] The present application is different from the conventional quasi-zero stiffness mechanism in that the components of the quasi-zero stiffness mechanism are combined with the parts of the motorcycle damping device, the bearing spring of the conventional damping device is used as the positive stiffness mechanism of the quasi-zero stiffness damping device in the present application, and a negative stiffness mechanism is additionally provided in the damping inner cylinder. This mode ensures that the positive stiffness mechanism and the negative stiffness mechanism can stably provide positive stiffness and negative stiffness, so that the damping device works in the quasi-zero stiffness region.

[0023] The negative stiffness mechanism of the present application adopts the combined structure of the ball and the inner convex rubber ring, which is different from the conventional full spring structure. This neck passage is more suitable for the built-in negative stiffness structure of the damping inner cylinder. During the driving of the motorcycle, the stability of the stiffness output of the positive stiffness mechanism and the negative stiffness mechanism can be ensured even if the road conditions are bumpy; at the same time, the axial movement of the overall damping device structure also has stability; the overall structure is obviously superior to the conventional full spring supported stiffness mechanism.

[0024] In addition, the U-shaped valve plate, the hollow piston rod, the top rod and the damping adjusting nut in the present application form a compression damping adjusting structure. The top rod can move relative to the hollow piston rod under the action of the damping adjusting nut, adjust the contact area between the U-shaped valve plate and the hollow piston rod, and thus realize the continuous adjustment of the compression damping and improve the energy absorption performance of the damper. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is an external structure schematic diagram of the damping device of the present application.

[0026] Figure 2 It is a cross-sectional view of the damping device of the present application.

[0027] Figure 3-a is a partial cross-sectional view of the inner convex rubber ring in the present application.

[0028] Figure 3-b is a schematic diagram of the negative stiffness mechanism in this invention.

[0029] Figure 4 This is a schematic diagram of the structure of the U-shaped valve plate of the present invention.

[0030] Figure 5 This is a schematic diagram of the push rod of the present invention.

[0031] Figure 6 This is a cross-sectional view of the hollow piston rod of the present invention.

[0032] The components include: 1. Dust cover; 2. Damping adjusting nut; 3. Oil seal ring; 4. Upper connector; 5. Push rod; 6. Hollow piston rod; 7. Shock-absorbing inner cylinder; 8. First flat washer; 9. Second flat washer; 10. Valve plate washer; 11. Piston plug; 12. Lower annular valve plate assembly; 13. Ball; 14. Inner convex rubber ring; 15. Shock-absorbing outer cylinder; 16. Preload adjusting ring; 17. Fixing nut; 18. Piston bushing; 19. Upper annular valve plate assembly; 20. U-shaped valve plate; 21. Buffer spring; 22. Oil seal ring; 23. Load-bearing spring; 24. Anti-bottoming rubber; 25. Nut washer.

[0033] 101. Install the ring;

[0034] 601, upper oil hole; 602, lower oil hole;

[0035] 1501. Lower installation ring. Detailed Implementation

[0036] The specific embodiments of the present invention will now be described with reference to the accompanying drawings.

[0037] like Figures 1-6 As shown, the quasi-zero stiffness continuously adjustable compression damping shock absorber of this embodiment includes a mutually nested shock absorber outer cylinder 15 and a shock absorber inner cylinder 7. A hollow piston rod 6 is movably sleeved in the shock absorber inner cylinder 7. A bearing spring 23 is sleeved on the mating body of the shock absorber outer cylinder 15 and the shock absorber inner cylinder 7. The bearing spring 23 serves as the positive stiffness mechanism of the shock absorber. A negative stiffness mechanism is provided inside the shock absorber inner cylinder 7. The negative stiffness mechanism includes: a ball 13, installed at one end of the hollow piston rod 6 that extends into the shock absorber inner cylinder 7; and an inner convex rubber ring 14, installed on the inner wall of the shock absorber inner cylinder 7. The inner diameter of the inner convex rubber ring 14 narrows in the middle to form a neck, and the inner diameter of the neck is smaller than the diameter of the ball 13. The positive stiffness mechanism and the negative stiffness mechanism are connected in parallel, so that the shock absorber is in a quasi-zero stiffness vibration isolation state.

[0038] The shock-absorbing outer cylinder 15 and the shock-absorbing inner cylinder 7 form a closed nested structure, and the piston plug 11 on the hollow piston rod 6 is slidably arranged on the inner wall of the shock-absorbing inner cylinder. The piston plug 11 divides the shock-absorbing inner cylinder into an upper oil cavity and a lower oil cavity, and the two cavities are connected through the inner cavity of the hollow piston rod 6, the oil feeding hole 601 and the oil discharging hole 602 on the hollow piston rod 6.

[0039] The upper annular valve plate group 19 and the lower annular valve plate group 12 are respectively arranged at the two axial ends of the piston plug 11, and the lower annular valve plate group 12 is fixedly arranged on the side of the piston plug 11 away from the piston plug 11 and is fastened by the fixing nut 17.

[0040] The hollow piston rod 6 is further sleeved with a sealing assembly abutting against the inner top end of the shock-absorbing inner cylinder 7, and the sealing assembly comprises a first flat gasket 8 in contact with the inner top end of the shock-absorbing inner cylinder 7, an oil seal ring 22 located on the side of the first flat gasket 8 away from the inner top end of the shock-absorbing inner cylinder 7, and a second flat gasket 9 located on the side of the oil seal ring 22 away from the first flat gasket 8.

[0041] The second flat gasket 9 and the valve plate gasket (10) are sleeved with a buffer spring 21.

[0042] The outer diameter of the top rod 5 is connected with the damping adjusting nut 2 at the end close to the dust cover 1, the damping adjusting nut 2 and the top rod 5 axially move relative to each other, and the contact area between the side wall of the lower end of the top rod 5 and the U-shaped valve plate 20 is adjusted.

[0043] The hollow piston rod 6 is sleeved with the top rod 5, the inner cavity of the hollow piston rod 6 is installed with the U-shaped valve plate 20 at the end close to the piston plug 11, and the damping adjusting nut 2 is sleeved on the end of the top rod 5 away from the piston plug 11.

[0044] The outer wall of the shock-absorbing outer cylinder 15 is provided with a preloading adjusting ring 16, the upper joint 4 is connected to the top of the hollow piston rod 6, and the two ends of the bearing spring 23 are tightly abutted against the preloading adjusting ring 16 and the end face of the upper joint 4, respectively.

[0045] The damping method of the compression damping continuous adjustable damping device based on quasi-zero stiffness of the embodiment comprises the following steps:

[0046] The upper mounting ring 101 and the lower mounting ring 1501 are arranged at the top and the bottom of the damping device respectively, when the upper mounting ring 101 at the top of the damping device is loaded, the hollow piston rod 6 and the damping inner cylinder 7 move relatively, the hollow piston rod 6 moves downward relative to the damping inner cylinder 7, in the process that the hollow piston rod 6 moves downward relative to the damping inner cylinder 7, when the ball 13 at the lower end of the hollow piston rod 6 contacts with the inner convex rubber ring 14 of the damping inner cylinder 7, the relative force is generated between the ball 13 and the inner convex rubber ring 14, when the ball 13 continues to move to the neck of the inner convex rubber ring 14, the relative force is increased, when the ball 13 moves to the axial half depth of the inner convex rubber ring 14, the contact between the inner convex rubber ring 14 and the ball 13 has the negative stiffness characteristic, the load spring 23 provides the positive stiffness in the process of being loaded and deformed, the mechanism of providing the negative stiffness is connected in parallel, and a new type of damping device with quasi-zero stiffness characteristic is formed, and further a quasi-zero stiffness low-frequency damping method is provided.

[0047] The contact area adjusting method between the U-shaped valve plate 20 and the side wall of the lower end of the top rod 5 is as follows:

[0048] The rotary damping adjusting nut 2 is adjusted, the rotation of the damping adjusting nut 2 is converted into the axial movement of the top rod 5 through the threaded structure, when the top rod 5 advances to one end of the ball 13, the contact area between the U-shaped valve plate 20 and the side wall of the lower end of the top rod 5 is increased, when the top rod 5 is retracted away from one end of the ball 13, the contact area between the U-shaped valve plate 20 and the side wall of the lower end of the top rod 5 is decreased, when the contact area is increased, the pressure required for the oil to pass through the oil hole (601) is large, so that the compression damping is increased, when the contact area is decreased, the pressure required for the oil to pass through the oil hole (601) is small, so that the compression damping is decreased.

[0049] The specific structure and working principle of the damping device are as follows:

[0050] The damping device is especially suitable for damping of a motorcycle. Figure 1 and Figure 2 As shown in the figures, the damping device comprises a damping outer cylinder 15, a damping inner cylinder 7 and a load spring 23.

[0051] The hollow piston rod 6 is arranged in the damping inner cylinder 7, the metal ball 13, the fixed nut 17, the lower annular valve plate group 12, the piston plug body 11, the upper annular valve plate group 19 and the valve plate washer 10 are sequentially arranged on the lower end of the hollow piston rod 6 from bottom to top.

[0052] The piston plug body 11 is arranged with the piston bushing 18 on the middle part of the outer diameter.

[0053] The top rod 5 and the U-shaped valve plate 20 are sequentially arranged in the hollow piston rod 6 from top to bottom.

[0054] The first flat gasket 8, the oil seal ring 22 and the second flat gasket 9 are sequentially arranged from top to bottom on the upper end of the inner diameter of the damping inner cylinder 7, and the buffer spring 21 is arranged between the second flat gasket 9 and the valve piece gasket 10;

[0055] The inner convex rubber ring 14 is arranged on the lower end of the inner diameter of the damping inner cylinder 7;

[0056] The pre-load adjusting ring 16 is arranged on the outer diameter of the damping outer cylinder 15;

[0057] The upper end of the outer diameter of the damping inner cylinder 7 is connected with the upper end of the inner diameter of the damping outer cylinder 15;

[0058] The upper end of the outer diameter of the hollow piston rod 6 is sequentially provided with the upper joint 4 and the anti-bottoming rubber 24 from top to bottom, the upper end of the inner diameter of the upper joint 4 is sequentially provided with the damping adjusting nut 2, the nut gasket 25 and the oil seal ring 3 from top to bottom, and the outer ring of the upper end of the upper joint 4 is provided with the dust cover 1; the top of the dust cover 1 is formed with the upper mounting ring 101;

[0059] The bearing spring 23 is sleeved on the outer diameter of the damping outer cylinder 15, the top end of the bearing spring 23 abuts against the bottom end edge of the upper joint 4, and the bottom end of the bearing spring 23 abuts against the top end of the pre-load adjusting ring 16. The bottom of the damping outer cylinder 15 is formed with the lower mounting ring 1501.

[0060] The inner convex rubber ring 14 and the metal ball 13 are adopted to form a negative stiffness mechanism, and the bearing spring 23 is adopted as a positive stiffness mechanism, and the two are connected in parallel to have quasi-zero stiffness characteristics.

[0061] The upper annular valve piece group 19, the lower annular valve piece group 12, the U-shaped valve piece 20, the hollow piston rod 6, the top rod 5, the damping adjusting nut 2, the piston 11 and the piston bushing 18 are adopted to form a damper, wherein the U-shaped valve piece 20, the hollow piston rod 6, the top rod 5 and the damping adjusting nut 2 form a continuously adjustable compression damping mechanism.

[0062] The upper oil hole 601 is formed above the piston 11 on the hollow piston rod 6, and the lower oil hole 602 is formed between the piston 11 and the metal ball 13 on the hollow piston rod 6. The outer diameter part of the hollow piston rod 6 has two steps; in order to facilitate description, the upper step and the lower step are used to distinguish the two steps in the following; the upper step of the hollow piston rod 6 abuts against the top end of the valve piece gasket 10, and the fixed nut 17 abuts against the bottom end of the lower annular valve piece group 12, so as to fix the damper formed by the upper annular valve piece group 19, the lower annular valve piece group 12 and the piston 11, and the lower step of the hollow piston rod 6 abuts against the top end of the ball 13.

[0063] The metal material of the ball 13 is aluminum alloy 7075 or aluminum alloy 6061, and the rubber material of the inner convex rubber ring is chloroprene rubber CR2322 or butadiene rubber BR9000.

[0064] The middle part of the outer diameter of the damping outer cylinder 15 and the inner diameter of the pre-load adjusting ring 16 are threaded, so that the pre-load adjusting ring 16 is rotated to control the pre-compression amount of the bearing spring 23.

[0065] The upper end of the top rod 5 is threaded, and the damping adjusting nut 2 is rotated to control the up-and-down movement of the top rod 5 relative to the hollow piston rod 6. The contact area between the lower end of the top rod 5 and the hollow piston rod 6 is in the shape of a flat key, thereby limiting the relative rotation of the top rod 5 relative to the hollow piston rod 6. The oil seal ring 3 is sleeved between the upper end of the inner diameter of the upper joint 4 and the outer diameter of the top rod 5, and the bottom end surface of the oil seal ring 3 is in contact with the top end surface of the hollow piston rod 6, thereby preventing the oil in the damping device from leaking from the top end of the hollow piston rod 6.

[0066] The U-shaped valve plate 20 covers the oil hole 601 of the hollow piston rod 6 on the side surface, and the upper end of the U-shaped valve plate 20 is fixed at the inner diameter step of the hollow piston rod 6 and limits the movement of the top rod 5.

[0067] The outer diameter of the inner convex rubber ring 14 is fixedly connected with the damping inner cylinder 7, and the inner diameter of the inner convex rubber ring 14 gradually increases and then gradually decreases from top to bottom. The inner convex rubber ring 14 is symmetrical about the midpoint of the top end and the bottom end, and the inner surface of the inner convex rubber ring 14 is smooth. The diameter of the ball 13 is greater than the minimum inner diameter of the inner convex rubber ring 14. The damping outer cylinder 15 and the damping inner cylinder 7 are filled with oil, and the oil lubricates the outer surface of the ball 13 and the inner surface of the inner convex rubber ring 14. When the metal ball 13 and the inner convex rubber ring 14 are in contact, the oil hole 602 can promote the flow of oil in the damping inner cylinder 7.

[0068] There is a gap between the inner diameter of the damping outer cylinder 15 and the outer diameter of the damping inner cylinder 7, and there is a certain distance between the bottom end of the damping outer cylinder 15 and the bottom end of the damping inner cylinder 7, which is used to compensate for the change in the volume of the oil in the upper and lower oil chambers separated by the piston 11 when the piston 11 moves in the damping inner cylinder 7.

[0069] The dust cover 1 is fixedly connected with the upper end edge of the upper joint 4 to prevent dust and other impurities from entering the damping device. The upper mounting ring 101 and the lower mounting ring 1501 are respectively welded to the outer top end of the dust cover 1 and the outer bottom end of the damping outer cylinder 15.

[0070] The buffer spring 21 is sleeved on the outer diameter of the hollow piston rod 6. When the buffer spring is in action, the top end of the buffer spring 21 abuts against the bottom end of the second flat gasket 9, and the bottom end of the buffer spring 21 abuts against the top end of the valve plate gasket 10.

[0071] The main working principle of the present embodiment about quasi-zero stiffness characteristic is that: referring to Figure 2 、 Figure 3a 、 Figure 3b When the mounting ring 101 of the shock-absorbing device is loaded, the hollow piston rod 6 and its fixed member will move downward relative to the shock-absorbing inner cylinder 7. Since the diameter of the metal ball 13 is larger than the diameter of the inner neck of the inner convex rubber ring 14, when the metal ball 13 moves downward to a certain position, it will contact the inner surface of the inner convex rubber ring 14. When the metal ball 13 continues to move downward after contacting the inner convex rubber ring 14, the force on the surface of the ball 13 by the inner surface of the inner convex rubber ring 14 becomes larger. Due to the lubrication of the oil and the elasticity of the inner convex rubber ring 14, the force generated by this contact mode is equivalent to that of a spring. When the metal ball 13 moves to more than half the height of the inner convex rubber ring 14, the contact between the inner convex rubber ring 14 and the metal ball 13 has a negative stiffness characteristic. The load spring 23 always provides a positive stiffness when deformed under load, and is connected in parallel with the internal negative stiffness mechanism, so the shock-absorbing device has a quasi-zero stiffness characteristic. In order to make the shock-absorbing device always have a quasi-zero stiffness characteristic, the preloaded adjusting ring 16 can be adjusted to make the metal ball 13 be at the position of half the height of the inner convex rubber ring 14 when the shock-absorbing device is loaded, for different loading conditions.

[0072] The main working principle of the present embodiment about continuous adjustable compression damping is that: referring to Figure 2 、 Figure 4 、 Figure 5 、 Figure 6 When the shock-absorbing device is loaded and compressed, the flow direction of the oil in the shock-absorbing inner cylinder 7 is from the inner tube or lower oil hole 602 at the bottom end of the hollow piston rod 6 to the upper oil hole 601, and then into the upper oil chamber. The rotary damping adjusting nut 2 can control the movement of the top rod 5 relative to the hollow piston rod 6, so as to control the contact area between the side wall of the lower end of the top rod 5 and the side of the U-shaped valve plate 20. When the contact area is large, the pressure required for the oil to pass through the upper oil hole 601 is large, resulting in an increase in compression damping; on the contrary, when the contact area is small, the compression damping becomes small. The movement of the top rod 5 relative to the hollow piston rod 6 can be continuously adjusted by the rotary damping adjusting nut 2.

[0073] The above description is an explanation of the present application, not a limitation of the application, and the scope of the present application is defined in the claims. Within the scope of the present application, any form of modification or equivalent replacement of part of the technical features can be made; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A quasi-zero stiffness based compression-damping continuously adjustable shock-absorbing device, comprising a shock-absorbing outer cylinder (15) and a shock-absorbing inner cylinder (7) nested with each other, a hollow piston rod (6) movably sleeved in the shock-absorbing inner cylinder (7), characterized in that: The matching body of the damping outer cylinder (15) and the damping inner cylinder (7) is provided with a bearing spring (23) as a positive stiffness mechanism of the damping device; the damping inner cylinder (7) is internally provided with a negative stiffness mechanism, which comprises: a ball (13) installed at one end of the hollow piston rod (6) extending into the damping inner cylinder (7); and an inner convex rubber ring (14) installed on the inner wall of the damping inner cylinder (7); the inner diameter of the middle section of the inner convex rubber ring (14) is reduced to form a neck portion, and the inner diameter of the neck portion is smaller than the diameter of the ball (13); the positive stiffness mechanism and the negative stiffness mechanism are connected in parallel, so that the damping device is in a quasi-zero stiffness vibration isolation state, The damping outer cylinder (15) and the damping inner cylinder (7) are closed and nested, and the piston plug body (11) on the hollow piston rod (6) slides on the inner wall of the damping inner cylinder (7); the piston plug body (11) divides the damping inner cylinder (7) into two regions of an upper oil cavity and a lower oil cavity, and the two regions are communicated through the inner cavity of the hollow piston rod (6), an oil feeding hole (601) and an oil discharging hole (602) on the hollow piston rod (6), The hollow piston rod (6) is internally sleeved with a jacking rod (5), and a U-shaped valve plate (20) is installed at one end of the inner cavity of the hollow piston rod (6) close to the piston plug body (11); and a damping adjusting nut (2) is sleeved on the end of the jacking rod (5) away from the piston plug body (11).

2. The quasi-zero stiffness based continuously adjustable compression-damping suspension device of claim 1, wherein: The axial two ends of the piston plug body (11) are respectively provided with an upper annular valve plate group (19) and a lower annular valve plate group (12), and the lower annular valve plate group (12) is tightly and fixedly installed with a fixed nut (17) on the side away from the piston plug body (11).

3. The quasi-zero stiffness based continuously adjustable compression-damping suspension device of claim 1, wherein: The hollow piston rod (6) is further sleeved with a sealing assembly abutting against the inner top end of the damping inner cylinder (7), which comprises a first flat gasket (8) in contact with the inner top end of the damping inner cylinder (7), an oil seal ring (22) on the side of the first flat gasket (8) away from the inner top end of the damping inner cylinder (7), and a second flat gasket (9) on the side of the oil seal ring (22) away from the first flat gasket (8).

4. The quasi-zero stiffness based continuously adjustable compression-damping suspension device of claim 3, wherein: A buffer spring (21) is sleeved between the second flat gasket (9) and the valve plate gasket (10).

5. The quasi-zero stiffness based continuously adjustable compression-damping suspension device of claim 1, wherein: The outer diameter of the jacking rod (5) is connected with the damping adjusting nut (2) at one end close to the dust cover (1), and the damping adjusting nut (2) and the jacking rod (5) axially move relative to each other to adjust the contact area between the side wall of the lower end of the jacking rod (5) and the U-shaped valve plate (20).

6. The quasi-zero stiffness based continuously adjustable compression-damping suspension device of claim 1, wherein: The outer wall of the damping outer cylinder (15) is provided with a preloading adjusting ring (16), the top of the hollow piston rod (6) is connected with an upper joint (4), and the two ends of the bearing spring (23) are tightly abutted against the end faces of the preloading adjusting ring (16) and the upper joint (4).

7. A method of vibration damping according to claim 1, wherein The method comprises the following steps: when the upper mounting ring at the top of the damping device is loaded, the hollow piston rod (6) and the damping inner cylinder (7) move relative to each other, and the hollow piston rod (6) moves downward relative to the damping inner cylinder (7); during the downward movement of the hollow piston rod (6) relative to the damping inner cylinder (7), when the ball (13) at the lower end of the hollow piston rod (6) contacts the inner convex rubber ring (14) in the damping inner cylinder (7), the relative force between the ball (13) and the inner convex rubber ring (14) is generated; when the ball (13) continues to move towards the neck of the inner convex rubber ring (14), the relative force increases, and when the ball (13) moves to the axial half depth of the inner convex rubber ring (14), the contact between the inner convex rubber ring (14) and the ball (13) has a negative stiffness characteristic; the load spring (23) provides positive stiffness during deformation under load, and is connected in parallel with the negative stiffness mechanism.

8. The vibration damping method of claim 7, wherein: The contact area adjustment method between the U-shaped valve plate (20) and the lower end side wall of the top rod (5) is as follows: rotate the damping adjustment nut (2), and convert the rotation of the damping adjustment nut (2) into the axial movement of the top rod (5) through the threaded structure; when the top rod (5) advances to one end of the ball (13), the contact area between the U-shaped valve plate (20) and the lower end side wall of the top rod (5) becomes larger; when the contact area becomes larger, the required pressure of the oil passing through the oil hole (601) is large, so that the compression damping becomes larger; when the top rod (5) is retracted away from one end of the ball (13), the contact area between the U-shaped valve plate (20) and the lower end side wall of the top rod (5) becomes smaller; when the contact area becomes smaller, the required pressure of the oil passing through the oil hole (601) is small, so that the compression damping becomes smaller.

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