Vibration damper and vibration reduction method thereof

Abstract

The invention discloses a vibration damper and a vibration reduction method thereof.The vibration damper comprises a first connector, a cylinder body, a piston rod, a nitrogen cylinder, a damper rebound valve, a damping cushion valve, a flow regulating valve, a piston sleeve, an end cover and a second connector, the first connector is in threaded connection with the cylinder body, and the side face of the first connector is in threaded connection with the nitrogen cylinder and the flow regulating valve; the end cover is fixedly installed at the other end of the cylinder body, the damper rebound valve is arranged in the cylinder body in a sliding mode, the piston rod is coaxially and fixedly installed in the middle of the damper rebound valve, the piston rod penetrates through the end cover and is connected with the second connector, the damping cushion valve is coaxially arranged on the outer side of the piston rod in a sleeved mode, and the piston sleeve is fixed to the inner side of the bottom end of the cylinder body. A base is arranged outside the second connector, a clamp spring seat is arranged outside the cylinder body, and an outer spring is arranged between the base and the clamp spring seat. Damping force is adjusted by adjusting the flowing speed of the damping medium through the flow adjusting valve, the piston sleeve and the damping cushion valve form a cushion cavity, rigid contact of components can be avoided, and damping stability is improved.

Description

Technical Field

[0001] This invention belongs to the field of vibration reduction technology, and more specifically, relates to a vibration damper and its vibration reduction method. Background Technology

[0002] In a vehicle's driving system, the shock absorber is a core component ensuring ride comfort and safety. Its main function is to attenuate vehicle vibrations caused by uneven road surfaces, mitigating the impact of bumps on the driving experience and vehicle structure. Currently, most mainstream vehicle shock absorbers on the market adopt a hydraulic damping structure. This structure achieves its damping function by incorporating springs on the outside of the shock absorber. The flow resistance of the hydraulic damping medium dissipates vibration energy, while the elastic deformation of the external springs provides cushioning and restoring force, thereby reducing or mitigating strong vibrations during vehicle operation.

[0003] However, traditional hydraulic shock absorbers face significant technical bottlenecks in practical applications. On the one hand, their structural design is relatively simple, and the arrangement of external springs is limited by the overall size of the shock absorber. If the spring specifications are increased to improve the buffering performance, it often leads to an increase in the overall volume, which can easily cause assembly interference with other vehicle components. Furthermore, it is difficult to increase the load-bearing capacity without changing the compression stroke. On the other hand, the damping force and spring stiffness of traditional shock absorbers are mostly fixed values, which cannot be adaptively adjusted according to changes in road bump intensity, driving speed, and other operating conditions. When faced with different degrees of external impact, it is difficult to balance the smooth attenuation of weak vibrations with the effective buffering of strong impacts, resulting in insufficient shock absorption adaptability. Summary of the Invention

[0004] To address the aforementioned deficiencies or improvement needs of existing technologies, this invention provides a vibration damper and its vibration reduction method. Through a flow regulating valve between the cylinder and the nitrogen cylinder, the flow rate of the damping medium can be actively controlled to precisely match different vibration intensities and driving conditions, improving the targeting and effectiveness of vibration suppression. The cylinder end is enclosed by a piston sleeve and a damping buffer valve to form a hydraulic buffer chamber. The small-hole damping effect weakens the impact at the piston rod extension end, avoiding rigid collisions of components, reducing wear, and ensuring vehicle body stability. An internal spring enhances the basic stiffness and avoids assembly interference, while an adjustable external spring adapts to different vibration requirements. Both work synergistically to attenuate vibration from both internal and external dimensions, improving ride smoothness and driving comfort. The extension valve channel ensures medium communication and graded damping control, while the piston rod channel constructs a complete flow loop and enables secondary damping fine-tuning. Balancing functionality and structural compactness, this invention comprehensively improves the damper's operational reliability and practicality.

[0005] To achieve the above objectives, according to one aspect of the present invention, a vibration damper is provided, comprising a first connector, a cylinder, a piston rod, a nitrogen cylinder, a damper extension valve, a damping buffer valve, a flow regulating valve, a piston sleeve, an end cap, and a second connector; wherein... The bottom of the first connector is detachably connected to one end of the cylinder body via threads, and a nitrogen cylinder and a flow regulating valve are detachably connected to its side via threads. The cylinder body contains a damping medium. A first passage connects the nitrogen cylinder and the flow regulating valve, and a second passage connects the flow regulating valve and the cylinder body. Through the cooperation of the first passage and the second passage, the flow regulating valve can adjust the flow rate of the nitrogen cylinder and the damping medium in the cylinder body, thereby realizing the adjustment of the damping force. An end cap is fixedly mounted on the end of the cylinder away from the first connector. A damper extension valve is slidably connected inside the cylinder. The damper extension valve divides the inner cavity of the cylinder into a first chamber and a second chamber. A piston rod is coaxially fixedly mounted on the middle of the damper extension valve. The end of the piston rod away from the damper extension valve passes through the end cap and is fixedly connected to the second connector. The damping buffer valve is slidably disposed in the second chamber and is coaxially fixedly fitted onto the outer wall of the piston rod. Its axial limit is located between the damper extension valve and the end cover. A piston sleeve is coaxially fixedly assembled on the inner side of the bottom end of the cylinder. One axial end of the piston sleeve abuts against the inner wall of the end cover. The piston rod and the piston sleeve are slidably connected. The piston sleeve and the damping buffer valve form a buffer chamber, which prevents the damper extension valve from directly contacting the end cover, weakens the end impact load, and improves the damping stability.

[0006] Furthermore, the top of the first connector is provided with a first connection hole, which is used to achieve a detachable assembly connection with an external component. The side wall of the first connector is also provided with a filling hole. A third passage is provided between the filling hole and the internal cavity of the cylinder, which is used to fill the cylinder with damping medium. The filling hole is sealed with screws.

[0007] Furthermore, the outer side wall of the cylinder is provided with a plurality of annular grooves spaced apart circumferentially, and the outer side of the cylinder is provided with a snap ring seat. The top inner side of the snap ring seat is provided with a limiting groove. During assembly, by simultaneously snapping the steel wire retaining ring into the limiting groove and the annular groove of the cylinder, the snap ring seat and the cylinder form a detachable axial limiting connection. The bottom of the second connector has a second connecting hole along the axial direction. A base is fitted on the outer side of the end of the second connector away from the piston rod. A through mounting hole is provided on the outer side wall of the base along the radial direction. During assembly, bolts are passed through the mounting hole and the second connecting hole in sequence to achieve a detachable fixed connection between the base and the second connector. An outer spring is fitted between the base and the snap ring seat. The outer spring is coaxially fitted on the outer side wall of the cylinder. The snap ring seat can be fitted with an annular groove at different positions on the outer side wall of the cylinder to adjust its installation position in the axial direction of the cylinder.

[0008] Furthermore, a buffer pad is fixedly fitted to one end of the second connector near the cylinder body, and the buffer pad is slidably connected to the piston rod.

[0009] Furthermore, the piston rod includes a slide rail, an adjusting push rod, a ball-shaped rod, a threaded rod, and a first through hole. The inner wall of the piston rod has a slide rail along its length. One end of the slide rail is connected to a threaded rod via a threaded connection. A through channel is formed in the middle of the threaded rod. A ball-shaped rod is provided at the inner end of the threaded rod. The outer diameter of the ball-shaped rod near the threaded rod is smaller than the inner diameter of the slide rail, and this end is spherical. The outer wall of the piston rod has a first through hole along its circumference. An adjusting push rod is provided at the end of the ball-shaped rod away from the threaded rod. The second connector is rotatably connected to an adjusting cam along its lateral direction. The arc-shaped protrusion on the adjusting cam abuts against the other end of the adjusting push rod.

[0010] Furthermore, the nitrogen cylinder includes a cylinder body, a nitrogen piston, a cap, and a wire retaining ring. The nitrogen piston is slidably connected inside the cylinder body, dividing the internal chamber of the cylinder body into a nitrogen chamber and a medium chamber. The nitrogen chamber is filled with nitrogen, and the medium chamber is connected to a first passage. The cap is fixedly connected to the open end of the cylinder body away from the nitrogen piston by a wire retaining ring. An annular groove is circumferentially formed on the outer wall of the cap, and a first sealing ring is embedded in the annular groove. The first sealing ring is used to achieve a sealing fit between the cap and the inner wall of the cylinder to prevent nitrogen leakage. An injection hole is formed axially in the middle of the cap. A rubber plug is embedded in the inner section of the injection hole, and the outer section of the injection hole is threadedly connected to the cap by a screw, with the end face of the screw abutting against the outer end face of the rubber plug. A second sealing ring is provided between the contact surfaces of the screw and the cap.

[0011] Further, the damper extension valve includes a piston plate, a piston guide ring, a valve hole, a second through hole, an O-ring, a valve plate, a first gasket, and a second gasket. The piston plate has multiple valve holes evenly spaced along its circumference, arranged in a counter-rotating pattern. These valve holes are divided into positive valve holes and negative valve holes. The end of the positive valve hole facing the first chamber is inclined along the outer circumference of the piston plate, and the end of the negative valve hole facing the second chamber is also inclined along the outer circumference of the piston plate. A second through hole is axially formed in the middle of the piston plate, communicating with both the positive valve hole and the first through hole of the piston rod. A mounting groove is circumferentially formed on the outer wall of the piston plate, and a piston guide ring is embedded within the mounting groove. An O-ring is fitted between the guide ring and the groove wall of the mounting groove. The O-ring is used to seal between the piston plate and the piston guide ring. Multiple valve plates are arranged circumferentially on both end faces of the piston plate. The valve plates can cover the valve hole away from the inclined surface and can automatically open and close under the pressure of the damping medium. A first gasket is attached to the side of the valve plate away from the piston plate. A second gasket is attached to the side of the first gasket in the first chamber away from the valve plate. During assembly, the piston plate, valve plates, first gasket and second gasket are coaxially fitted onto the end of the piston rod in sequence, and axial locking is achieved by the threaded engagement of the nut with the end of the piston rod.

[0012] Furthermore, the piston sleeve is recessed at one end facing the damping buffer valve to form a circular groove, and a certain gap is provided between the circular groove and the damping buffer valve. When the damping buffer valve moves toward the piston sleeve, the damping medium in the buffer cavity formed by the damping buffer valve and the piston sleeve can flow into the second chamber through the gap.

[0013] Furthermore, an inner spring is provided in the first chamber of the cylinder body. The inner spring is coaxially sleeved on the outside of the piston rod end, with one end abutting against the inner end face of the first connector and the other end abutting against the end face of the piston plate.

[0014] According to a second aspect of the present invention, a vibration reduction method using a vibration damper is provided, comprising the following steps: When the vehicle moves downward, the damping medium in the first chamber is squeezed, causing the pressure to rise. Part of the damping medium passes through the flow regulating valve in the second passage and enters the nitrogen cylinder through the first passage. At the same time, the damping medium pushes the nitrogen piston to move, compressing the nitrogen. Another portion of the damping medium flows into the positive valve orifice and opens the first gasket in the second chamber, allowing the damping medium to flow into the second chamber through the positive valve orifice. At the same time, the damping medium in the first chamber can also flow into the positive valve orifice through the through channel in the middle of the threaded rod and the first through hole, and then flow into the second chamber through the positive valve. When the vehicle moves upward, the high-pressure nitrogen in the nitrogen cylinder pushes the nitrogen piston to move in the opposite direction, pushing the damping medium in the nitrogen cylinder from the first passage through the flow regulating valve and into the first chamber through the second passage; The damping medium in the second chamber flows into the reverse valve orifice and opens the first gasket in the first chamber, allowing the damping medium to flow into the first chamber through the reverse valve orifice.

[0015] In summary, compared with the prior art, the above-described technical solutions conceived by this invention can achieve the following beneficial effects: 1. A vibration damper of the present invention, by setting a flow regulating valve between the cylinder and the nitrogen cylinder, can actively regulate the flow rate of the damping medium between the cylinder and the nitrogen cylinder to produce different damping effects, cope with vibration impacts of different intensities, and meet the damping adaptation requirements of different vehicle driving conditions, thereby improving the pertinence and effectiveness of vibration suppression.

[0016] The present invention discloses a vibration damper in which a hydraulic buffer chamber is formed by a piston sleeve and a damping buffer valve at the end of the cylinder body. The damping effect of the small hole generates a stable buffering effect, which can effectively reduce the impact load at the end of the piston rod extension stroke, avoid rigid collision between components, reduce the risk of wear, and improve the smoothness of the damper operation, thus ensuring the stability of the vehicle body posture.

[0017] This invention discloses a vibration damper in which an inner spring and an outer spring form a dual elastic damping system through a synergistic layout of "built-in support + external adjustable". This system leverages the unique advantages of each component while achieving complementary and synergistic effects. The inner spring utilizes the internal space of the cylinder to enhance the overall stiffness of the damper, providing stable basic elastic support, while avoiding assembly interference caused by a large-sized outer spring and improving vehicle compatibility. The outer spring can change its compression by adjusting the installation position of the retainer seat, achieving precise adjustment of the elastic damping force to adapt to vibration requirements of different intensities. The combination of the two ensures basic performance while providing flexible adaptability. The two ends of the inner spring abut against the first connector and the damper extension valve, which can alleviate the impact of the extension valve's telescopic movement and optimize the stability of internal vibration attenuation. The outer spring forms an elastic limit on the base and retainer seat through a preset compression amount, reducing rigid collisions with external components and reducing wear. The two work together from both internal and external dimensions to weaken vibration impact, improve overall vibration attenuation efficiency, and enhance vehicle ride smoothness and comfort.

[0018] The present invention discloses a vibration damper in which the valve orifice and connecting orifice of the damper extension valve serve as the core flow path, enabling the damping medium to communicate between the first chamber and the second chamber, providing a basis for the generation of damping force. The inclined surface design of the positive and negative valve orifices reduces flow resistance and improves response speed. Furthermore, in conjunction with the valve plate and spring washer, an elastic flow control structure is formed, which can adaptively open and close and adjust the opening degree according to the vibration intensity, achieving precise control of damping force in stages, and adapting to the vertical movement conditions of vehicles.

[0019] The present invention discloses a vibration damper in which the through channel and the first through hole of the piston rod serve as auxiliary flow paths, and are connected with the channel of the extension valve to form a complete flow circuit, ensuring smooth circulation of the medium. At the same time, the gap can be changed by adjusting the cam to drive the ball rod, thereby controlling the flow speed of the medium and realizing secondary precise fine-tuning of the damping force. Moreover, the channel is built-in and does not occupy extra space, thus balancing functionality and structural compactness. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a vibration damper according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a vibration damper according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the piston rod of a vibration damper according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of a nitrogen cylinder for a vibration damper according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of the damper extension valve of a vibration damper according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the piston plate of a vibration damper according to an embodiment of the present invention.

[0021] In all the accompanying drawings, the same reference numerals denote the same technical features, specifically: 1-first connector, 101-first connecting hole, 2-cylinder body, 201-first chamber, 202-second chamber, 3-piston rod, 301-slide rail, 302-adjusting push rod, 303-spherical rod, 304-threaded rod, 305-first through hole, 4-nitrogen cylinder, 401-cylinder body, 402-nitrogen piston, 403-cap, 4031-rubber plug, 4032-first sealing ring, 4033-second sealing ring, 4034-screw, 40 4-Steel wire retaining ring, 5-Damper extension valve, 501-Piston plate, 502-Piston guide ring, 503-Valve hole, 504-Second through hole, 505-O-ring, 506-Valve plate, 507-First gasket, 508-Second gasket, 6-Damper buffer valve, 7-Flow regulating valve, 8-Piston sleeve, 9-End cap, 10-Second connector, 1001-Second connecting hole, 11-Adjusting cam, 12-Buffer pad, 13-Inner spring, 14-Outer spring, 15-Snap ring seat, 16-Base, 17-Bolt pin, 18-Screw. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0023] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0024] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0025] In this patent, the terms "comprising," "including," or any other variations thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of additional identical elements in the process, method, article, or apparatus that includes said element.

[0026] Example 1 like Figure 1-6As shown, this embodiment of the invention provides a vibration damper, including a first connector 1, a cylinder 2, a piston rod 3, a nitrogen cylinder 4, a damper extension valve 5, a damping buffer valve 6, a flow regulating valve 7, a piston sleeve 8, an end cap 9, and a second connector 10; wherein: the bottom of the first connector 1 is detachably connected to one end of the cylinder 2 by a thread, and the side of the first connector 1 is detachably connected to the nitrogen cylinder 4 and the flow regulating valve 7 by threads respectively; the cylinder 2 contains a damping medium; a first passage connects the nitrogen cylinder 4 and the flow regulating valve 7, and a second passage connects the flow regulating valve 7 and the cylinder 2; through the cooperation of the first passage and the second passage, the flow regulating valve 7 can adjust the relationship between the nitrogen cylinder 4 and the damping medium in the cylinder 2. The flow rate is adjusted to regulate the damping force. An end cap 9 is fixedly mounted on the end of the cylinder 2 away from the first connector 1. The end cap 9 seals the end of the cylinder 2 to prevent leakage of the damping medium. A damper extension valve 5 is slidably connected inside the cylinder 2. The damper extension valve 5 divides the inner cavity of the cylinder 2 into a first chamber 201 and a second chamber 202. The damper extension valve 5 has multiple connecting holes, with both ends of each hole connecting to the first chamber 201 and the second chamber 202 respectively, allowing the damping medium to flow between the two chambers. A piston rod 3 is coaxially fixedly mounted on the middle of the damper extension valve 5. The end of the piston rod 3 away from the damper extension valve 5 passes through the end cap 9 and connects to the second connector 1. The damper extension valve 5 is fixedly connected to the piston rod 3 during its extension stroke to provide the main damping force and suppress vibration amplitude. A damping buffer valve 6 is slidably connected inside the second chamber 202. The damping buffer valve 6 is coaxially fixedly fitted onto the outer wall of the piston rod 3, and its axial limit is located between the damper extension valve 5 and the end cover 9. A piston sleeve 8 is coaxially fixedly fitted onto the inner side of the bottom end of the cylinder 2. One axial end of the piston sleeve 8 abuts against the inner wall of the end cover 9, and the piston rod 3 and piston sleeve 8 are slidably connected. The piston sleeve 8 and the damping buffer valve 6 form a buffer chamber, preventing the damper extension valve 5 from directly contacting the end cover 9, weakening the end impact load, and improving damping stability. This invention uses a flow regulating valve 7 and nitrogen... The passageway coordination between the air cylinder 4 and the cylinder 2 allows for flexible adjustment of the damping medium flow rate, achieving precise adaptation of the damping force and meeting the vibration suppression requirements under different working conditions. The chamber separation design and connecting hole structure of the damper extension valve 5 ensure the orderly flow of the damping medium, which, together with the main damping force it provides, significantly improves the stability of vibration attenuation. The buffer chamber avoids direct rigid contact between the damper extension valve 5 and the end cover 9. Through the synergistic effect of the damping buffer valve 6 and the piston sleeve 8, the end impact load during the extension and retraction stroke of the piston rod 3 is effectively weakened, reducing component wear and extending the service life of the damper. Each component adopts a threaded detachable connection and coaxial fixed assembly structure, which facilitates later disassembly and maintenance, reducing operation and maintenance costs.

[0027] Furthermore, the top of the first connector 1 is provided with a first connection hole 101, which is used to achieve a detachable assembly connection with an external component; the side wall of the first connector 1 is also provided with a filling hole, and a third passage is provided between the filling hole and the internal cavity of the cylinder 2. The third passage is used to fill the cylinder 2 with damping medium. The filling hole is sealed with screws 18 to ensure the sealed storage of the damping medium inside the cylinder 2 and to prevent medium leakage.

[0028] Furthermore, the nitrogen cylinder 4 includes a cylinder body 401, a nitrogen piston 402, a cap 403, and a wire retaining ring 404; the nitrogen piston 402 is slidably connected inside the cylinder body 401, and the nitrogen piston 402 divides the internal chamber of the cylinder body 401 into a nitrogen chamber and a medium chamber. The nitrogen chamber is filled with nitrogen, and the medium chamber is connected to the first passage, so that the nitrogen and the damping medium are located on both sides of the nitrogen piston 402 respectively. Through the sliding adaptation of the nitrogen piston 402, the dynamic balance adjustment of the nitrogen pressure and the damping medium pressure is achieved.

[0029] Furthermore, a cover 403 is fixedly connected to the inside of the open end of the cylinder 401 away from the nitrogen piston 402 by a steel wire retaining ring 404. An annular groove is circumferentially formed on the outer wall of the cover 403, and a first sealing ring 4032 is embedded in the annular groove. The first sealing ring 4032 is used to achieve a sealing fit between the cover 403 and the inner wall of the cylinder 401 to prevent nitrogen leakage. An injection hole is axially formed in the middle of the cover 403. A rubber plug 4031 is embedded in the inner hole section of the gas injection hole. The outer hole section of the gas injection hole is threadedly connected to the cap 403 by a screw 4034, and the end face of the screw 4034 abuts against the outer end face of the rubber plug 4031 to achieve the fixed positioning of the rubber plug 4031. A second sealing ring 4033 is provided between the contact surfaces of the screw 4034 and the cap 403. The second sealing ring 4033 is used to enhance the sealing performance at the gas injection hole and ensure the sealing reliability of the nitrogen cylinder 4.

[0030] Furthermore, the outer wall of the cylinder body 2 is provided with multiple annular grooves spaced apart circumferentially. A retaining ring seat 15 is provided on the outer side of the cylinder body 2. A limiting groove is provided on the inner side of the top of the retaining ring seat 15. During assembly, by simultaneously engaging the steel wire retaining ring within the limiting groove and the annular groove of the cylinder body 2, a detachable axial limiting connection is formed between the retaining ring seat 15 and the cylinder body 2. The bottom of the second connector 10 has a second connecting hole 1001 axially formed. A base 16 is fitted onto the outer side of the end of the second connector 10 away from the piston rod 3. A through mounting hole is provided radially on the outer wall of the base 16. During assembly, bolt pins 17 are sequentially inserted through the mounting hole and the second connecting hole 1001 to achieve a detachable fixed connection between the base 16 and the second connector 10. The structure facilitates the later inspection or replacement of components such as the base 16 and the second connector 10, reducing maintenance costs. An outer spring 14 is assembled between the base 16 and the snap ring seat 15. The outer spring 14 is coaxially sleeved on the outer side wall of the cylinder body 2. The snap ring seat 15 can be fitted with an annular groove at different positions on the outer side wall of the cylinder body 2 to adjust its axial installation position. By adjusting the installation position of the snap ring seat 15, the axial relative distance between the base 16 and the snap ring seat 15 can be changed, thereby precisely adjusting the stiffness of the outer spring 14 and achieving precise adjustment of the damping force of the outer spring 14. This allows the damper to adapt to vibration suppression requirements under different working conditions and effectively avoids assembly space interference caused by the selection of an excessively large outer spring 14.

[0031] Furthermore, a buffer pad 12 is fixedly mounted on one end of the second connector 10 near the cylinder 2. The buffer pad 12 is slidably connected to the piston rod 3. The buffer pad 12 can form a buffer protection between the end of the cylinder 2 and the second connector 10, avoiding rigid collision between the two during the operation of the damper, thereby reducing component wear and ensuring the operating stability of the damper.

[0032] Further, the piston rod 3 includes a slide rail 301, an adjusting push rod 302, a ball rod 303, a threaded rod 304, and a first through hole 305. The inner wall of the piston rod 3 has a slide rail 301 along its length. One end of the slide rail 301 is internally connected to the threaded rod 304 via a threaded connection. A through channel is formed through the middle of the threaded rod 304 for the flow of damping medium. A ball rod 303 is provided at the inner end of the threaded rod 304. The outer diameter of the ball rod 303 near the threaded rod 304 is smaller than the inner diameter of the slide rail 301, and this end is spherical to accommodate the gap adjustment with the threaded rod 304 and guide the flow of damping medium. The outer wall of the piston rod 3 has a first through hole 305 along its circumference. The first through hole 305 communicates with a connecting hole on the damper extension valve 5, realizing the first chamber 201. The damping medium flows between the second chamber 202. The end of the ball rod 303 away from the threaded rod 304 is provided with an adjusting push rod 302. The second connector 10 is rotatably connected to an adjusting cam 11 along its lateral direction. The arc-shaped protrusion on the adjusting cam 11 abuts against the other end of the adjusting push rod 302. By rotating the adjusting cam 11 in both directions, its arc-shaped protrusion can be driven to push the adjusting push rod 302 to reciprocate along the axial direction of the slide rail 301. The adjusting push rod 302 then drives the ball rod 303 to move closer to or away from the threaded rod 304, so as to change the size of the gap between the ball rod 303 and the threaded rod 304. Since this gap is one of the flow channels of the damping medium, the change of its size can directly control the flow speed of the damping medium, thereby realizing the secondary precise adjustment of the damping force of the damper and improving the adaptability of the damper to different vibration conditions.

[0033] Further, the damper extension valve 5 includes a piston plate 501, a piston guide ring 502, a valve hole 503, a second through hole 504, an O-ring 505, a valve plate 506, a first gasket 507, and a second gasket 508; the piston plate 501 is evenly perforated with a plurality of valve holes 503 arranged in a counter-rotating manner along its circumference. The valve holes 503 are divided into two types: positive valve holes and negative valve holes. The positive valve hole facing the first chamber 201 has an inclined surface along the outer circumference of the piston plate 501, and the negative valve hole facing the second chamber 202 has an inclined surface along the outer circumference of the piston plate 501. 1. The outer periphery is set as an inclined surface, and the positive valve hole and the negative valve hole are spaced apart; this inclined surface structure can reduce the flow resistance of the damping medium at the valve hole 503, ensure the smooth flow of the damping medium between the first chamber 201 and the second chamber 202, and improve the damping adjustment response speed; the piston plate 501 has a second through hole 504 axially opened in the middle, and the second through hole 504 is connected to the positive valve hole and the first through hole 305 of the piston rod 3 respectively, forming a multi-stage flow channel for the damping medium; the outer side wall of the piston plate 501 has a mounting groove circumferentially opened, and the mounting groove is... A piston guide ring 502 is embedded in the groove, and an O-ring 505 is fitted between the piston guide ring 502 and the groove wall. The O-ring 505 is used to achieve a seal between the piston plate 501 and the piston guide ring 502, preventing the damping medium from leaking between the piston plate 501 and the inner wall of the cylinder 2, and ensuring the sealing of the chamber partition. Multiple valve plates 506 are arranged circumferentially at intervals on both end faces of the piston plate 501. The valve plates 506 can shield and cover the end of the valve hole 503 away from the inclined surface, and the valve plates 506 are positioned to shield the damping medium. Under pressure, it can automatically open and close; the valve plate 506 is fitted with a first gasket 507 on the side away from the piston plate 501; the first gasket 507 located in the first chamber 201 is also fitted with a second gasket 508 on the side away from the valve plate 506; during assembly, the piston plate 501, valve plate 506, first gasket 507 and second gasket 508 are coaxially fitted onto the end of the piston rod 3 in sequence, and axial locking is achieved by the threaded engagement of the nut with the end of the piston rod 3, thereby fixing the damper extension valve 5 as a whole onto the end of the piston rod 3.

[0034] Specifically, when the vehicle moves downwards, the damping medium in the first chamber 201 is compressed, causing the pressure to increase. Part of this damping medium flows from the second passage through the flow regulating valve 7 and then through the first passage into the nitrogen cylinder 4. Simultaneously, the damping medium pushes the nitrogen piston 402 to move, compressing the nitrogen. Another part of the damping medium flows into the positive valve orifice, opening the first gasket 507 in the second chamber 202, allowing the damping medium to flow into the second chamber 202 through the positive valve orifice. At the same time, the damping medium in the first chamber 201 can also flow into the positive valve orifice through the through channel in the middle of the threaded rod 34 and the first through hole 35, and then flow into the second chamber 202 through the positive valve. When the vehicle moves upwards, the high-pressure nitrogen in the nitrogen cylinder 4 pushes the nitrogen piston. 402 moves in the opposite direction, pushing the damping medium in the nitrogen cylinder 4 from the first passage through the flow regulating valve 7 and into the first chamber 201 through the second passage. At the same time, the damping medium in the second chamber 202 flows into the reverse valve orifice and opens the first gasket 507 in the first chamber 201, allowing the damping medium to flow into the first chamber 201 through the reverse valve orifice. Therefore, the flow rate of the damping medium in the nitrogen cylinder 4 and the first chamber 201 can be adjusted by the flow regulating valve 7 to control the damping force. Similarly, the speed at which the damping medium in the first chamber 201 flows through the through channel in the middle of the threaded rod 34 and the first through hole 35 into the positive valve orifice can be controlled by adjusting the cam 11 to control the damping force.

[0035] Furthermore, an inner spring 15 is provided in the first chamber 21 of the cylinder 2. The inner spring 15 is coaxially sleeved on the outer side of the end of the piston rod 3. One end of the inner spring 15 abuts against the inner end face of the first connector 1, and the other end abuts against the end face of the piston plate 51. It can provide elastic support force during the extension and retraction stroke of the damper extension valve 5, help to weaken vibration and impact, and improve the smoothness of the movement of the damper extension valve 5.

[0036] Furthermore, the piston sleeve 8 is recessed at one end facing the damping buffer valve 6 to form a circular groove. A certain gap is provided between the circular groove and the damping buffer valve 6. When the damping buffer valve 6 moves toward the piston sleeve 8, the damping medium in the buffer chamber formed by the damping buffer valve 6 and the piston sleeve 8 can flow into the second chamber 202 through the gap, preventing the damper extension valve 5 from directly contacting the end cap 9, weakening the end impact load, and improving damping stability. Example 2 Combination Figure 1-6 This invention provides a vibration reduction method using a vibration damper, which is implemented using the aforementioned vibration damper. The specific steps are as follows: When the vehicle moves downward, the damping medium in the first chamber 201 is squeezed, causing the pressure to rise. Part of the damping medium passes through the second passage, the flow regulating valve 7, and enters the nitrogen cylinder 4 through the first passage. At the same time, the damping medium pushes the nitrogen piston 402 to move, compressing the nitrogen. Another portion of the damping medium flows into the positive valve orifice and opens the first gasket 507 in the second chamber 202, allowing the damping medium to flow into the second chamber 202 through the positive valve orifice. At the same time, the damping medium in the first chamber 201 can also flow into the positive valve orifice through the through channel in the middle of the threaded rod 34 and the first through hole 35, and then flow into the second chamber 202 through the positive valve. When the vehicle moves upward, the high-pressure nitrogen in the nitrogen cylinder 4 pushes the nitrogen piston 402 to move in the opposite direction, pushing the damping medium in the nitrogen cylinder 4 from the first passage through the flow regulating valve 7 and into the first chamber 201 through the second passage. The damping medium in the second chamber 202 flows into the reverse valve orifice and opens the first gasket 507 in the first chamber 201, allowing the damping medium to flow into the first chamber 201 through the reverse valve orifice.

[0037] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A vibration damper, characterized in that, It includes a first connector (1), a cylinder body (2), a piston rod (3), a nitrogen cylinder (4), a damper extension valve (5), a damping buffer valve (6), a flow regulating valve (7), a piston sleeve (8), an end cap (9), and a second connector (10); among which, The bottom of the first connector (1) is detachably connected to one end of the cylinder (2) by a thread, and a nitrogen cylinder (4) and a flow regulating valve (7) are detachably connected to its side by a thread. The cylinder (2) is provided with a damping medium. A first passage is provided between the nitrogen cylinder (4) and the flow regulating valve (7), and a second passage is provided between the flow regulating valve (7) and the cylinder (2). Through the cooperation of the first passage and the second passage, the flow regulating valve (7) can adjust the flow rate of the damping medium in the nitrogen cylinder (4) and the cylinder (2), thereby realizing the adjustment of the damping force. An end cap (9) is fixedly mounted on the end of the cylinder (2) away from the first connector (1). A damper extension valve (5) is slidably connected inside the cylinder (2). The damper extension valve (5) divides the inner cavity of the cylinder (2) into a first chamber (201) and a second chamber (202). A piston rod (3) is coaxially fixedly mounted on the middle part of the damper extension valve (5). The end of the piston rod (3) away from the damper extension valve (5) passes through the end cap (9) and is fixedly connected to the second connector (10). The damping buffer valve (6) is slidably disposed in the second chamber (202), and is coaxially fixedly fitted on the outer wall of the piston rod (3). Its axial limit is located between the damper extension valve (5) and the end cover (9). The piston sleeve (8) is coaxially fixedly assembled on the inner side of the bottom end of the cylinder (2). One axial end of the piston sleeve (8) abuts against the inner wall of the end cover (9). The piston rod (3) and the piston sleeve (8) are slidably connected. The piston sleeve (8) and the damping buffer valve (6) form a buffer chamber to prevent the damper extension valve (5) from directly contacting the end cover (9), thereby weakening the end impact load and improving the damping stability.

2. The vibration damper according to claim 1, characterized in that, The top of the first connector (1) is provided with a first connection hole (101). The first connection hole is used to achieve a detachable assembly connection with external components. The side wall of the first connector (1) is also provided with a filling hole. A third passage is provided between the filling hole and the internal cavity of the cylinder (2). The third passage is used to fill the cylinder (2) with damping medium. The filling hole is sealed with a screw (18).

3. A vibration damper according to claim 2, characterized in that, The outer side wall of the cylinder (2) is provided with a plurality of annular grooves spaced apart in the circumference. The outer side of the cylinder (2) is provided with a snap ring seat (15). The inner side of the top of the snap ring seat (15) is provided with a limiting groove. During assembly, by simultaneously snapping the steel wire retaining ring into the limiting groove and the annular groove of the cylinder (2), the snap ring seat (15) and the cylinder (2) form a detachable axial limiting connection. The bottom of the second connector (10) is provided with a second connecting hole (1001) along the axial direction. The outer side of the end of the second connector (10) away from the piston rod (3) is fitted with a base (16). The outer side wall of the base (16) is provided with a through mounting hole along the radial direction. During assembly, the mounting hole and the second connecting hole (1001) are sequentially passed through by bolt pins (17) to realize the detachable fixed connection between the base (16) and the second connector (10). An outer spring (14) is assembled between the base (16) and the snap ring seat (15). The outer spring (14) is coaxially fitted on the outer side wall of the cylinder (2). The snap ring seat (15) can be fitted with an annular groove at different positions on the outer side wall of the cylinder (2) to realize the adjustment of its installation position in the axial direction of the cylinder (2).

4. A vibration damper according to claim 3, characterized in that, The second connector (10) is fixedly fitted with a buffer pad (12) at one end near the cylinder (2), and the buffer pad (12) is slidably connected to the piston rod (3).

5. A vibration damper according to claim 1, characterized in that, The piston rod (3) includes a slide rail (301), an adjusting push rod (302), a ball rod (303), a threaded rod (304), and a first through hole (305). The inner wall of the piston rod (3) is provided with a slide rail (301) along its length. One end of the slide rail (301) is connected to the threaded rod (304) by a threaded connection. A through channel is provided in the middle of the threaded rod (304). A ball rod (303) is provided on the inner end of the threaded rod (304). The outer diameter of the end near the threaded rod (304) is smaller than the inner diameter of the slide (301), and the end is set as a spherical structure. The outer wall of the piston rod (3) is provided with a first through hole (305) along its circumference. The end of the spherical rod (303) away from the threaded rod (304) is provided with an adjusting push rod (302). The second connector (10) is rotatably connected to an adjusting cam (11) along its lateral direction. The arc-shaped protrusion on the adjusting cam (11) abuts against the other end of the adjusting push rod (302).

6. A vibration damper according to claim 1, characterized in that, The nitrogen cylinder (4) includes a cylinder body (401), a nitrogen piston (402), a cover (403), and a wire retaining ring (404). The nitrogen piston (402) is slidably connected inside the cylinder body (401). The nitrogen piston (402) divides the internal chamber of the cylinder body (401) into a nitrogen chamber and a medium chamber. The nitrogen chamber is filled with nitrogen. The medium chamber is connected to the first passage. The cover (403) is fixedly connected to the opening end of the cylinder body (401) away from the nitrogen piston (402) by the wire retaining ring (404). The outer side wall of the cover (403) is provided with an annular groove. An internal sealing ring (4032) is embedded in the cover (403) to achieve a sealing fit between the cover (403) and the inner wall of the cylinder (401) to prevent nitrogen leakage. The cover (403) has an axially oriented injection hole in the middle. A rubber plug (4031) is embedded in the inner hole of the injection hole. The outer hole of the injection hole is threaded to the cover (403) by a screw (4034), and the end face of the screw (4034) abuts against the outer end face of the rubber plug (4031). A second sealing ring (4033) is provided between the contact surfaces of the screw (4034) and the cover (403).

7. A vibration damper according to claim 1, characterized in that, The damper extension valve (5) includes a piston plate (501), a piston guide ring (502), a valve hole (503), a second through hole (504), an O-ring (505), a valve plate (506), a first gasket (507), and a second gasket (508). The piston plate (501) has multiple valve holes (503) evenly spaced along its circumference. These valve holes (503) are divided into two types: positive valve holes and negative valve holes. The positive valve hole, facing the first chamber (201), extends along the piston plate (504). 501) The outer periphery is set as an inclined surface. The end of the valve hole facing the second chamber (202) is set as an inclined surface along the outer periphery of the piston plate (501). The middle part of the piston plate (501) is provided with a second through hole (504) along the axial direction. The second through hole (504) is connected to the positive valve hole and the first through hole (305) of the piston rod (3). The outer side wall of the piston plate (501) is provided with a mounting groove. The piston guide ring (502) is embedded in the mounting groove. The piston guide ring ( An O-ring (505) is fitted between the piston plate (501) and the groove wall of the mounting groove. The O-ring (505) is used to achieve a seal between the piston plate (501) and the piston guide ring (502). Multiple valve plates (506) are arranged circumferentially on both end faces of the piston plate (501). The valve plates (506) can cover the end of the valve hole (5083) away from the inclined surface, and the valve plates (506) can automatically open and close under the pressure of the damping medium. A first gasket (507) is attached to the side of the valve plate (506) away from the piston plate (501). A second gasket (508) is also attached to the side of the first gasket (507) in the first chamber (201) away from the valve plate (506). During assembly, the piston plate (501), valve plate (506), first gasket (507) and second gasket (508) are coaxially fitted onto the end of the piston rod (3) in sequence, and axial locking is achieved by the threaded engagement of the nut with the end of the piston rod (3).

8. A vibration damper according to any one of claims 1-7, characterized in that, The piston sleeve (8) is recessed at one end facing the damping buffer valve (6) to form a circular groove. A certain gap is provided between the circular groove and the damping buffer valve (6). When the damping buffer valve (6) moves toward the piston sleeve (8), the damping medium in the buffer cavity formed by the damping buffer valve (6) and the piston sleeve (8) can flow into the second chamber (202) through the gap.

9. A vibration damper according to any one of claims 1-7, characterized in that, An inner spring (15) is provided in the first chamber (21) of the cylinder (2). The inner spring (15) is coaxially sleeved on the outside of the end of the piston rod (3). One end of the spring abuts against the inner end face of the first connector (1), and the other end abuts against the end face of the piston plate (51).

10. A vibration damping method for a vibration damper, characterized in that, The application of a vibration damper as described in any one of claims 1-9 is characterized by comprising the following steps: When the vehicle moves downward, the damping medium in the first chamber (201) is squeezed, causing the pressure to rise. Part of the damping medium passes through the second passage, the flow regulating valve (7), and enters the nitrogen cylinder (4) through the first passage. At the same time, the damping medium pushes the nitrogen piston (402) to move, compressing the nitrogen. Another portion of the damping medium flows into the positive valve orifice and opens the first gasket (507) in the second chamber (202), allowing the damping medium to flow into the second chamber (202) through the positive valve orifice. At the same time, the damping medium in the first chamber (201) can also flow into the positive valve orifice through the through channel in the middle of the threaded rod (34) and the first through hole (35), and then flow into the second chamber (202) through the positive valve. When the vehicle moves upward, the high-pressure nitrogen in the nitrogen cylinder (4) pushes the nitrogen piston (402) to move in the opposite direction, pushing the damping medium in the nitrogen cylinder (4) from the first passage through the flow regulating valve (7) and into the first chamber (201) through the second passage; The damping medium in the second chamber (202) flows into the reverse valve orifice and opens the first gasket (507) in the first chamber (201), allowing the damping medium to flow into the first chamber (201) through the reverse valve orifice.

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