Nitrogen shock absorber and shock absorption method thereof

Abstract

The invention belongs to the technical field of mechanical shock absorption, and discloses a nitrogen shock absorber and a shock absorption method thereof. The nitrogen shock absorber comprises a nitrogen cylinder, an oil storage cylinder, a piston adjusting mechanism and a hydraulic adjusting mechanism, the piston adjusting mechanism comprises a buffer pipe and a buffer piston assembly, the buffer piston assembly divides an inner cavity of the oil storage cylinder into a first cavity and a second cavity, and one end of a first oil passing channel of the oil storage cylinder can be communicated with the first cavity; one end of the second oil passing channel of the oil storage cylinder can be communicated with the first chamber, and the other end of the second oil passing channel of the oil storage cylinder can be communicated with the nitrogen cylinder; a first adjusting assembly of the hydraulic adjusting mechanism is used for adjusting the oil passing amount in the first oil passing channel in unit time, and a second adjusting assembly of the hydraulic adjusting mechanism is used for adjusting the oil passing amount in the second oil passing channel in unit time. The nitrogen shock absorber has the function of damping force grading adjustment, the adjustable range of damping force is enlarged, the installation difficulty on a vehicle is lowered, and the damping force adjustment efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of mechanical vibration reduction technology, and in particular to a nitrogen vibration damper and its vibration reduction method. Background Technology

[0002] Nitrogen vibration dampers are high-efficiency vibration reduction devices based on the compressibility of high-pressure nitrogen gas. They absorb vibration energy through the compression and expansion of the gas, and achieve vibration control in conjunction with a precisely designed hydraulic or mechanical damping system. As a core component of modern vibration reduction technology, this device has wide applications in vehicle suspension systems, industrial equipment, and sports equipment.

[0003] In existing technology, when the shock absorber reaches its limit compression stroke, the buffer piston enters the buffer sleeve and cooperates with the buffer sleeve to form a sealed chamber to achieve the hydraulic buffering function. However, the buffer sleeve occupies space inside the oil reservoir, causing the effective stroke of the buffer piston to be shortened. This not only leads to metal fatigue and reduces passenger comfort, but also limits the adjustable range of damping force. Moreover, after long-term use, the buffer sleeve and buffer piston may jam due to oil contamination or wear, affecting the adjustment effect of the damping force.

[0004] In addition, a compressed hydraulic buffer regulating valve system is installed between the oil reservoir and the nitrogen cylinder of the shock absorber for graded adjustment of the hydraulic damping force. However, this valve assembly is generally integrated with multi-stage regulating valves, resulting in an increase in the overall size of the shock absorber. In space-constrained applications such as rally racing, this increases the difficulty of installing the shock absorber and significantly increases the complexity of the overall vehicle layout. Moreover, the regulating components of the valve assembly are generally located internally, requiring an external drive device for adjustment, which is inconvenient and affects the efficiency of damping force adjustment.

[0005] Therefore, there is an urgent need for a nitrogen vibration damper and its vibration reduction method to solve the above problems. Summary of the Invention

[0006] The purpose of this invention is to provide a nitrogen shock absorber and its damping method, which has the function of graded adjustment of damping force, effectively avoids the occurrence of sudden increase in damping force, expands the adjustable range of damping force, reduces the installation difficulty of nitrogen shock absorber on vehicle, and improves the convenience and efficiency of damping force adjustment.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] In one aspect, a nitrogen gas vibration damper is provided, comprising:

[0009] The nitrogen cylinder and the oil reservoir are provided. The nitrogen cylinder is located on one side of the oil reservoir along the first direction. The first end of the oil reservoir is provided with a first oil passage and a second oil passage.

[0010] A piston adjusting mechanism includes a buffer tube and a buffer piston assembly. The buffer tube is disposed at the first end of an oil reservoir. The buffer piston assembly is movably disposed in the inner cavity of the oil reservoir along the axial direction of the oil reservoir, dividing the inner cavity of the oil reservoir into a first chamber and a second chamber. One end of a first oil passage can communicate with the first chamber and the other end can communicate with the inner cavity of the buffer tube. One end of a second oil passage can communicate with the first chamber and the other end can communicate with the inner cavity of a nitrogen cylinder. The buffer piston assembly is provided with multiple third oil passages. The first chamber communicates with the second chamber through the third oil passages. The buffer piston assembly has a first state of being sleeved on the buffer tube and a second state of being separated from the buffer tube. In the first state, at least one third oil passage can communicate with the inner cavity of the buffer tube, and some third oil passages are blocked by the buffer tube.

[0011] The hydraulic adjustment mechanism includes a first adjustment component and a second adjustment component. The first adjustment component is movably disposed on one side of the oil reservoir along the second direction and is used to adjust the amount of oil passing through the first oil passage per unit time. The first adjustment component is partially located outside the oil reservoir. The second adjustment component is movably disposed inside the second oil passage and is used to adjust the amount of oil passing through the second oil passage per unit time. The first direction and the second direction are both radial directions of the oil reservoir and are arranged at an angle.

[0012] Optionally, the first adjustment component includes a first adjustment body, an operating handle, and a first conical head. The first end of the oil reservoir is provided with a connecting hole. One end of the connecting hole is connected to the first oil passage, and the other end is connected to the outside of the oil reservoir. The first adjustment body is movably disposed in the connecting hole along the extension direction of the connecting hole and is sealed to the hole wall of the connecting hole. The operating handle is located outside the oil reservoir and is threadedly connected to one end of the first adjustment body. The first conical head is disposed at the other end of the first adjustment body and is located in the first oil passage.

[0013] Optionally, the first adjustment component further includes an elastic limiting member disposed on the first adjustment body, wherein the hole wall of the connecting hole is arranged in a stepped manner along the direction close to the first oil passage, and the elastic limiting member can contact the hole wall of the connecting hole under its elastic force.

[0014] Optionally, the elastic limiting member includes an elastic part and a ball limiting part. One end of the elastic part is connected to the first adjusting body, and the other end contacts the ball limiting part. The ball limiting part can contact the hole wall of the connecting hole under the elastic force of the elastic part and roll with the hole wall of the connecting hole.

[0015] Optionally, the buffer piston assembly includes a connecting pipe, a first buffer piston, and a second buffer piston. The first and second buffer pistons are spaced apart along the axial direction of the connecting pipe and are sealed to the inner wall of the oil reservoir. The first and second buffer pistons are each provided with a first through hole. The connecting pipe wall is provided with a second through hole, which is located between the first and second buffer pistons. The inner cavity of the connecting pipe communicates with the second chamber. In the first state, the buffer pipe is inserted into the inner cavity of the connecting pipe.

[0016] Optionally, the first end of the oil reservoir is provided with a groove communicating with the first chamber. In the first state, the end of the connecting pipe facing the buffer pipe can move into the groove.

[0017] Optionally, the piston adjustment mechanism further includes a piston rod and a third adjustment assembly. The piston rod is movably passed through the second end of the oil reservoir along the extension direction of the oil reservoir and connected to the buffer piston assembly. The buffer piston assembly is provided with a perforation at one end near the piston rod. At least one third oil passage can communicate with the perforation. One end of the third adjustment assembly is movably disposed on the piston rod along the piston rod axially, and the other end is located in the perforation, for adjusting the amount of oil passing through the perforation per unit time.

[0018] Optionally, the second adjustment assembly includes a second adjustment body, an adjustment core, and a fourth conical head. The second adjustment body is sealed to the inner wall of the second oil passage. The second adjustment body is provided with a fourth oil passage. One end of the fourth oil passage is connected to the second oil passage, and the other end is connected to the inner cavity of the nitrogen cylinder. One end of the adjustment core is threaded to the second adjustment body, and the other end is connected to the fourth conical head, which is located inside the fourth oil passage.

[0019] Optionally, a separating piston is provided inside the nitrogen cylinder, which is movable along its extension direction. The separating piston is sealed to the inner wall of the nitrogen cylinder and divides the inner cavity of the nitrogen cylinder into an oil storage chamber and a nitrogen chamber. The oil storage chamber is connected to the second oil passage.

[0020] Secondly, a vibration reduction method for a nitrogen gas vibration damper is provided, applicable to the aforementioned nitrogen gas vibration damper, comprising the following steps:

[0021] According to the operating conditions of the nitrogen shock absorber, adjust the position of the first adjustment component in the first oil passage and adjust the position of the second adjustment component in the second oil passage to change the amount of oil passing through the first and second oil passages per unit time.

[0022] The drive buffer piston assembly moves towards the buffer tube, squeezing the hydraulic oil in the first chamber. The first portion of the hydraulic oil in the first chamber flows into the second chamber through the unblocked third oil passage. The second portion of the hydraulic oil in the first chamber enters the nitrogen cylinder through the second oil passage. The third portion of the hydraulic oil in the first chamber enters the buffer tube through the first oil passage. When the buffer piston assembly is still in the second state, the third portion of the hydraulic oil entering the buffer tube can flow back to the first chamber from the buffer tube. When the buffer piston assembly switches to the first state, the third portion of the hydraulic oil entering the buffer tube enters the second chamber through the third oil passage connected to the buffer tube.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0024] This invention provides a nitrogen shock absorber and its damping method. One end of a first oil passage is connected to a first chamber, and the other end is connected to a buffer tube, allowing a third portion of hydraulic oil in the first chamber to enter the buffer tube via the first oil passage. Simultaneously, the damping force can be adjusted by regulating the oil flow rate per unit time in the first oil passage through a first adjusting component. When the buffer piston assembly moves within the oil reservoir, a second portion of hydraulic oil in the first chamber can enter the nitrogen cylinder via a second oil passage, changing the hydraulic oil volume in the nitrogen cylinder and generating damping force. Furthermore, the damping force can be further adjusted by regulating the oil flow rate per unit time in the second oil passage through a second adjusting component. The nitrogen shock absorber provided by this invention achieves graded damping force adjustment through the first and second adjusting components. The first adjusting component and the nitrogen cylinder are located on opposite sides of the oil reservoir, with only the second adjusting component positioned between the nitrogen cylinder and the oil reservoir. Compared to existing technologies, this significantly reduces the space occupied by the hydraulic adjustment mechanism and lowers the installation difficulty of the nitrogen shock absorber on vehicles. In addition, the first adjustment component is located outside the oil reservoir, allowing operators to directly operate the first adjustment component without the need for other external drive devices, which significantly improves the convenience and efficiency of damping force adjustment.

[0025] When the buffer piston assembly moves within the oil reservoir, the volume of the first chamber changes. Regardless of the state, the hydraulic oil within the first chamber can flow out smoothly and stably in three parts. Furthermore, the damping force generated by the hydraulic oil flow varies depending on the number of blocks in the third oil passage. This not only achieves graded adjustment of the damping force but also effectively prevents sudden increases in damping force, ensuring passenger comfort. Compared to existing technologies, the nitrogen shock absorber provided by this invention eliminates the need for a buffer sleeve. This not only helps prevent jamming of the buffer piston assembly and improves the sensitivity of the buffer, but also allows the buffer piston assembly to move along the full length of the oil reservoir, expanding the movement distance of the buffer piston assembly and the adjustable range of the damping force. Attached Figure Description

[0026] Figure 1 A cross-sectional view of the oil reservoir of the nitrogen shock absorber provided by the present invention;

[0027] Figure 2 A cross-sectional view of the nitrogen cylinder of the nitrogen damper provided by the present invention;

[0028] Figure 3 A schematic diagram showing the flow direction of hydraulic oil in the first chamber when the buffer piston assembly of the nitrogen damper provided by the present invention is in the second state;

[0029] Figure 4 A cross-sectional view of the first adjustment component of the nitrogen vibration damper provided by the present invention;

[0030] Figure 5 A first schematic diagram showing the flow direction of hydraulic oil in the first chamber when the buffer piston assembly of the nitrogen damper provided by the present invention is in the first state;

[0031] Figure 6 A second schematic diagram showing the flow direction of hydraulic oil in the first chamber when the buffer piston assembly of the nitrogen damper provided by the present invention is in the first state;

[0032] Figure 7 This is a third schematic diagram showing the direction of hydraulic oil flow in the first chamber when the buffer piston assembly of the nitrogen damper provided by the present invention is in the first state.

[0033] In the picture:

[0034] 1. Nitrogen cylinder; 11. Separating piston; 12. Oil reservoir; 13. Nitrogen chamber;

[0035] 2. Oil storage tank; 21. First chamber; 22. Second chamber;

[0036] 3. Piston adjusting mechanism; 31. Buffer tube; 311. Third through hole; 32. Buffer piston assembly; 321. Connecting tube; 3211. Second through hole; 322. First buffer piston; 3221. First through hole; 323. Second buffer piston; 33. Piston rod; 34. Third adjusting assembly; 341. Push rod; 342. Second conical head; 35. Through hole;

[0037] 41. First adjusting assembly; 411. First adjusting body; 412. Operating handle; 4121. Operating part; 4122. Screw; 413. First conical head; 414. Elastic limiting member; 4141. Elastic part; 4142. Ball limiting part; 415. First sealing ring; 416. Second sealing ring; 42. Second adjusting assembly; 421. Second adjusting body; 4211. Fourth oil passage; 422. Adjusting core; 423. Fourth conical head;

[0038] 5. First connecting seat; 51. First oil passage; 52. Second oil passage; 53. Connecting hole; 54. Groove;

[0039] 6. Second connecting seat; 61. Third conical head;

[0040] 7. Guiding components. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0042] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0043] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0044] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meanings.

[0045] Example 1

[0046] like Figures 1 to 7As shown, this embodiment provides a nitrogen shock absorber with a graded damping force adjustment function, which effectively avoids the occurrence of sudden increases in damping force, expands the adjustable range of damping force, reduces the installation difficulty of nitrogen shock absorbers on vehicles, and improves the convenience and efficiency of damping force adjustment.

[0047] See Figure 1 , Figure 2 and Figure 3 The nitrogen shock absorber includes a nitrogen cylinder 1, an oil reservoir 2, a piston adjustment mechanism 3, and a hydraulic adjustment mechanism. The nitrogen cylinder 1 is located on one side of the oil reservoir 2 along a first direction. The first end of the oil reservoir 2 is provided with a first oil passage 51 and a second oil passage 52. The piston adjustment mechanism 3 includes a buffer tube 31 and a buffer piston assembly 32. The buffer tube 31 is located at the first end of the oil reservoir 2. The buffer piston assembly 32 is movably disposed in the inner cavity of the oil reservoir 2 along the axial direction of the oil reservoir 2, dividing the inner cavity of the oil reservoir 2 into a first chamber 21 and a second chamber 22. One end of the first oil passage 51 can communicate with the first chamber 21, and the other end can communicate with the inner cavity of the buffer tube 31. One end of the second oil passage 52 can communicate with the first chamber 21, and the other end can communicate with the inner cavity of the nitrogen cylinder 1. The buffer piston assembly 32 is provided with multiple third oil passages. The first chamber 21 is connected to the second chamber 22 via a third oil passage. The buffer piston assembly 32 has a first state where it is sleeved on the buffer tube 31 and a second state where it is separated from the buffer tube 31. In the first state, at least one third oil passage can communicate with the inner cavity of the buffer tube 31, and part of the third oil passage is blocked by the buffer tube 31. The hydraulic adjustment mechanism includes a first adjustment component 41 and a second adjustment component 42. The first adjustment component 41 is movably disposed on one side of the oil reservoir 2 along the second direction and is used to adjust the amount of oil passing through the first oil passage 51 per unit time. The first adjustment component 41 is partially located outside the oil reservoir 2. The second adjustment component 42 is movably disposed inside the second oil passage 52 and is used to adjust the amount of oil passing through the second oil passage 52 per unit time. The first direction and the second direction are both radial directions of the oil reservoir 2 and are arranged at an angle. The first end and the second end are the two ends of the oil reservoir 2 along its extension direction.

[0048] The nitrogen damper provided in this embodiment has a first oil passage 51, one end of which is connected to the first chamber 21 and the other end to the buffer tube 31. This allows the third portion of hydraulic oil in the first chamber 21 to enter the buffer tube 31 through the first oil passage 51. Simultaneously, the damping force can be adjusted by regulating the amount of oil passing through the first oil passage 51 per unit time using the first adjusting component 41. When the buffer piston assembly 32 moves within the oil reservoir 2, the second portion of hydraulic oil in the first chamber 21 can enter the nitrogen cylinder 1 through the second oil passage 52, changing the amount of hydraulic oil in the nitrogen cylinder 1 and generating damping force. Furthermore, the damping force can be further adjusted by regulating the amount of oil passing through the second oil passage 52 per unit time using the second adjusting component 42. The nitrogen shock absorber provided by this invention can achieve graded adjustment of damping force through a first adjustment component 41 and a second adjustment component 42. The first adjustment component 41 and the nitrogen cylinder 1 are located on opposite sides of the oil reservoir 2, while only the second adjustment component 42 is positioned between the nitrogen cylinder 1 and the oil reservoir 2. Compared with existing technologies, this significantly reduces the space occupied by the hydraulic adjustment mechanism and lowers the installation difficulty of the nitrogen shock absorber on vehicles. Furthermore, the first adjustment component 41 is partially located outside the oil reservoir 2, allowing operators to directly operate it without the need for other external drive devices, significantly improving the convenience and efficiency of damping force adjustment.

[0049] When the buffer piston assembly 32 moves within the oil reservoir 2, the volume of the first chamber 21 changes. Regardless of the state, the hydraulic oil within the first chamber 21 can flow out smoothly and stably in three parts. Moreover, the damping force generated by the hydraulic oil flow varies depending on the number of blocks in the third oil passage. This not only achieves graded adjustment of the damping force but also effectively avoids sudden increases in damping force, ensuring passenger comfort. Compared with existing technologies, the nitrogen shock absorber provided by this invention eliminates the need for a buffer sleeve. This not only helps prevent the buffer piston assembly 32 from jamming and improves the sensitivity of the buffer but also allows the buffer piston assembly 32 to move along the full length of the oil reservoir 2, expanding the travel distance of the buffer piston assembly 32 and the adjustable range of the damping force.

[0050] For example, the buffer sleeve occupies a distance of 15mm to 20mm along the extension direction of the oil reservoir 2, thereby increasing the travel distance of the buffer piston assembly 32 of the nitrogen shock absorber provided in this embodiment by at least 15mm to 20mm.

[0051] Optionally, see Figure 3 , Figure 4 and Figure 5The first adjustment component 41 includes a first adjustment body 411, an operating handle 412, and a first conical head 413. A connecting hole 53 is provided at the first end of the oil reservoir 2. One end of the connecting hole 53 communicates with the first oil passage 51, and the other end communicates with the outside of the oil reservoir 2. The first adjustment body 411 is movably disposed within the connecting hole 53 along its extension direction and is sealed to the wall of the connecting hole 53. The operating handle 412 is located outside the oil reservoir 2 and is threadedly connected to one end of the first adjustment body 411. The first conical head 413 is disposed at the other end of the first adjustment body 411 and is located within the first oil passage 51. The operating handle 412 facilitates the adjustment of the position of the first adjustment body 411 by the operator, improving operational convenience. The first conical head 413 is a cone, which occupies a portion of the space in the first oil passage 51, causing a difference in the amount of hydraulic oil flowing through the gap between the first conical head 413 and the wall of the first oil passage 51, thus affecting the hydraulic damping force. Turning the operating handle 412 causes the first adjusting body 411 to move along the extension direction of the connecting hole 53, and drives the first conical head 413 to move. The position of the first conical head 413 in the first oil passage 51 changes, and the distance between it and the channel wall of the first oil passage 51 changes, thereby changing the amount of oil passing through the first oil passage 51 per unit time and completing the adjustment of the hydraulic damping force.

[0052] Specifically, see Figure 4 and Figure 5 The connecting hole 53 is set at an angle to the first oil passage 51, and the maximum cross-sectional diameter of the first conical head 413 is the same as the diameter of the first oil passage 51, so that the first conical head 413 has the limit position to block the first oil passage 51.

[0053] In this embodiment, see Figure 4 and Figure 5 The first adjustment component 41 also includes an elastic limiting member 414 disposed on the first adjustment body 411. The wall of the connecting hole 53 is arranged in a stepped manner along the direction close to the first oil passage 51, and the elastic limiting member 414 can contact the wall of the connecting hole 53 under its elastic force. This arrangement makes the connecting hole 53 a stepped hole, and the stepped surface of the connecting hole 53 can limit the position of the elastic limiting member 414 within it. Therefore, when the operating handle 412 is not turned, the position of the first adjustment body 411 within the connecting hole 53 will not change, that is, the amount of oil passing through the first oil passage 51 per unit time is fixed, and the hydraulic damping force is fixed. When the operating handle 412 is turned, the deformation of the elastic limiting member 414 changes. At this time, the first adjustment body 411 can move within the connecting hole 53 to adjust the hydraulic damping force.

[0054] Specifically, see Figure 4 and Figure 5The elastic limiting member 414 includes an elastic part 4141 and a ball limiting part 4142. One end of the elastic part 4141 is connected to the first adjusting body 411, and the other end contacts the ball limiting part 4142. The ball limiting part 4142 can contact the wall of the connecting hole 53 under the elastic force of the elastic part 4141 and roll in cooperation with the wall of the connecting hole 53. This arrangement ensures that when the first adjusting body 411 is installed into the connecting hole 53, the wall of the connecting hole 53 will compress the elastic part 4141 through the ball limiting part 4142, causing it to deform and accumulate elastic potential energy. As the position of the first adjusting body 411 changes, the elastic potential energy of the elastic part 4141 will continue to differ, thereby ensuring that the ball limiting part 4142 can always contact the wall of the connecting hole 53. At the same time, the ball limiting part 4142 can roll relative to the hole wall of the connecting hole 53, which helps to reduce the friction between the elastic limiting part 414 and the hole wall of the connecting hole 53, reduce the driving force of the operator to turn the operating handle 412, and make it easier for the operator to operate.

[0055] For example, the ball limiting part 4142 is a ball bearing, and the elastic part 4141 is a spring.

[0056] Specifically, multiple elastic limiting members 414 are provided, and the multiple elastic limiting members 414 are arranged at intervals along the circumference of the first adjusting body 411, so that the first adjusting body 411 can be subjected to uniform constraint force in the circumference, thereby improving the stability of limiting the first adjusting body 411.

[0057] In this embodiment, see Figure 4 and Figure 5 The first adjustment component 41 also includes a first sealing ring 415 sleeved on the first adjustment body 411. The first adjustment body 411 is sealed to the wall of the connecting hole 53 through the first sealing ring 415 to ensure that the hydraulic oil in the first oil passage 51 will not leak through the connecting hole 53.

[0058] See Figure 4 and Figure 5 The operating handle 412 is located inside the connecting hole 53. A second sealing ring 416 is provided between the part of the operating handle 412 inside the connecting hole 53 and the hole wall of the connecting hole 53, so that the operating handle 412 can be sealed to the hole wall of the connecting hole 53, thereby further improving the sealing performance.

[0059] In this embodiment, see Figure 4 and Figure 5 The operating handle 412 includes an operating part 4121 and a screw 4122. The operating part 4121 is located outside the connecting hole 53, and the screw 4122 is embedded in the operating part 4121. The operating part 4121 is threadedly connected to the first adjusting body 411 through the screw 4122.

[0060] For example, screw 4122 is a countersunk Torx screw 4122.

[0061] In this embodiment, see Figure 2 and Figure 5 The first end of the oil reservoir 2 is provided with a first connecting seat 5 that is sealed to it. The first connecting seat 5 can block the opening of the oil reservoir 2. The nitrogen shock absorber can be connected to the external structure through the first connecting seat 5. The first oil passage 51, the second oil passage 52, the connecting hole 53 and the buffer tube 31 are all provided on the first connecting seat 5.

[0062] Optionally, see Figure 5 The buffer piston assembly 32 includes a connecting pipe 321, a first buffer piston 322, and a second buffer piston 323. The first buffer piston 322 and the second buffer piston 323 are axially spaced on the connecting pipe 321 and are sealed to the inner wall of the oil reservoir 2 to divide the inner cavity of the oil reservoir 2 into a first chamber 21 and a second chamber 22. The first buffer piston 322 and the second buffer piston 323 are each provided with a first through hole 3221, and the connecting pipe 321 is provided with a second through hole 3211. The second through hole 3211 is located between the first buffer piston 322 and the second buffer piston 323. The inner cavity of the connecting pipe 321 is connected to the second chamber 22. In the first state, the buffer pipe 31 is inserted into the inner cavity of the connecting pipe 321. This configuration allows the inner cavity of the connecting pipe 321 to form a third oil passage. A portion of the inner cavity of the connecting pipe 321, the second through hole 3211, the gap between the first buffer piston 322 and the second buffer piston 323, and the first through hole 3221 on the second buffer piston 323 can together form a third oil passage, ensuring that hydraulic oil can flow between the first chamber 21 and the second chamber 22.

[0063] In this embodiment, see Figure 5Both the first buffer piston 322 and the second buffer piston 323 are provided with multiple first through holes 3221. The multiple first through holes 3221 of the first buffer piston 322 are arranged at intervals along its circumference. The multiple first through holes 3221 of the second buffer piston 323 correspond one-to-one with the multiple first through holes 3221 of the first buffer piston 322. A third oil passage can be formed between any first through hole 3221 of the first buffer piston 322 and the corresponding first through hole 3221 of the second buffer piston 323, which significantly increases the number of third oil passages. The pipe wall of the connecting pipe 321 is provided with multiple second through holes 3211, which are arranged at intervals along the circumference of the connecting pipe 321. This arrangement can further increase the number of third oil passages. The buffer tube 31 has multiple third through holes 311 on its wall. These third through holes 311 are arranged at intervals along the extension direction of the buffer tube 31. When the buffer piston assembly 32 is fitted onto the buffer tube 31, a portion of the hydraulic oil in the first chamber 21 can flow through the third through holes 311 and the inner cavity of the buffer tube 31 to the inner cavity of the connecting tube 321. This increases the flow path of the hydraulic oil in the first chamber 21, which helps to further avoid the occurrence of a sudden increase in damping force and ensures the comfort of the occupants.

[0064] Specifically, see Figure 2 and Figure 3 When the buffer piston assembly 32 moves towards the buffer tube 31 and is in the second state, the first portion of hydraulic oil in the first chamber 21 can not only enter the inner cavity of the connecting tube 321, but also flow into the first through hole 3221 of the first buffer piston 322; the second portion of hydraulic oil in the first chamber 21 enters the nitrogen cylinder 1 through the second oil passage 52, generating nitrogen counterforce in the nitrogen cylinder 1; the third portion of hydraulic oil in the first chamber 21 enters the buffer tube 31 through the first oil passage 51, and flows back to the first chamber 21 from the buffer tube 31; where the arrow indicates the flow direction of the hydraulic oil. At this time, the overall compressive damping force of the nitrogen shock absorber is relatively small.

[0065] See Figure 2 and Figure 5When the buffer piston assembly 32 is switched to the first state, the end of the connecting pipe 321 facing the buffer pipe 31 is blocked by the buffer pipe 31, while the second through hole 3211 and the third through hole 311 are not blocked. The first part of the hydraulic oil in the first chamber 21 flows into the first through hole 3221 of the first buffer piston 322; the second part of the hydraulic oil enters the nitrogen cylinder 1 through the second oil passage 52, increasing the nitrogen counterforce; the third part of the hydraulic oil can enter the buffer pipe 31 through the first oil passage 51 and also through the third through hole 311. The hydraulic oil in the buffer pipe 31 enters the connecting pipe 321, and the hydraulic oil in the connecting pipe 321 can flow to the second through hole 3211 and the end of the connecting pipe 321 facing the second chamber 22. At this time, the hydraulic oil in the second chamber 22 increases, its pushing force on the buffer piston assembly 32 increases, and the flow path of the hydraulic oil also increases, resulting in an increase in the overall compressive damping force of the nitrogen shock absorber compared to the second state.

[0066] See Figure 2 and Figure 6 The buffer piston assembly 32 continues to move towards the first end of the oil reservoir 2, and the multiple third through holes 311 are sequentially blocked by the pipe wall of the connecting pipe 321, increasing the damping force. (See also...) Figure 7 After all the third through holes 311 are blocked, the third portion of hydraulic oil can only enter the buffer pipe 31 through the first oil passage 51. (See reference...) Figure 7 When the buffer piston assembly 32 moves to the wall of the buffer tube 31 to block the second through hole 3211, the hydraulic oil in the connecting tube 321 can only flow along the extension direction of the connecting tube 321 and can no longer enter the gap between the first buffer piston 322 and the second buffer piston 323, which will further increase the damping force.

[0067] During the above process, the nitrogen shock absorber is in a compressed state, and the damping force generated by the movement of the buffer piston assembly 32 gradually increases. When the nitrogen shock absorber is in a rebound state, the buffer piston assembly 32 will move away from the first end of the oil reservoir 2 ( Figure 3 The flow path of the hydraulic oil changes in the reverse order of the process described above as the X direction moves (negative direction).

[0068] In this embodiment, see Figure 7 The first end of the oil reservoir 2 is provided with a groove 54 communicating with the first chamber 21. In the first state, the end of the connecting pipe 321 facing the buffer pipe 31 can move into the groove 54. The end of the connecting pipe 321 facing the buffer pipe 31 is closer to the first end of the oil reservoir 2 than the first buffer piston 322. Therefore, the groove 54 ensures that the first buffer piston 322 can move to the end of the oil reservoir 2. Compared with the buffer sleeve in the prior art, this further expands the movement distance of the buffer piston assembly 32 and expands the adjustable range of the damping force.

[0069] Specifically, see Figure 7 The groove 54 is provided on the first connecting seat 5.

[0070] Optionally, see Figure 1 and Figure 3 The piston adjustment mechanism 3 also includes a piston rod 33 and a third adjustment component 34. The piston rod 33 movably passes through the second end of the oil reservoir 2 along the extension direction of the oil reservoir 2 and is connected to the buffer piston assembly 32. The buffer piston assembly 32 has a through hole 35 at one end near the piston rod 33, and at least one third oil passage can communicate with the through hole 35. One end of the third adjustment component 34 is movably disposed on the piston rod 33 along the axial direction of the piston rod 33, and the other end is located in the through hole 35, used to adjust the amount of oil passing through the through hole 35 per unit time. When the nitrogen shock absorber compresses or rebounds, the external structure will drive the piston rod 33 to move, and the piston rod 33 will drive the buffer piston assembly 32 to move within the oil reservoir 2. The other end of the third adjustment component 34 is located in the through hole 35, which occupies the space of the through hole 35. As the third adjustment component 34 moves, the space occupied by the third adjustment component 34 in the through hole 35 changes, thereby changing the amount of hydraulic oil entering the through hole 35 through the third oil passage, and realizing further adjustment of the damping force.

[0071] In this embodiment, see Figure 1 and Figure 3 The third oil passage formed by the inner cavity of the connecting pipe 321 is connected to the perforation 35. In other embodiments, the first through hole 3221 of the first buffer piston 322, the gap between the first buffer piston 322 and the second buffer piston 323, the second through hole 3211, and part of the inner cavity of the connecting pipe 321 can form a third oil passage, which can be connected to the perforation 35.

[0072] Specifically, see Figure 1 and Figure 3 In the orientation of the nitrogen shock absorber, a second connecting seat 6 is also included. The piston rod 33 extends along the X direction, and its end away from the oil reservoir 2 is connected to an external structure through the second connecting seat 6. The perforation 35 extends along the Y direction. The third adjusting assembly 34 includes a push rod 341 movably passing through the piston rod 33 along the X direction and a second conical head 342 disposed at the end of the push rod 341. A third conical head 61 movable along the Y direction is disposed on the second connecting seat 6, and the conical surface on the third conical head 61 contacts the push rod 341. When the third conical head 61 is driven to move along the Y direction, the third conical head 61 can push the push rod 341 to move along the X direction through the conical surface. The push rod 341 drives the second conical head 342 to move within the perforation 35, thereby realizing the adjustment of the amount of oil passing through the perforation 35 per unit time.

[0073] In this embodiment, see Figure 1 A guide assembly 7 is provided between the piston rod 33 and the oil reservoir 2. The guide assembly 7 is used to constrain the movement direction of the piston rod 33 and is sealed to both the piston rod 33 and the oil reservoir 2. The specific structure of the guide assembly 7 is prior art in this field and will not be described in detail here.

[0074] Optionally, see Figure 2 The second adjusting assembly 42 includes a second adjusting body 421, an adjusting core 422, and a fourth conical head 423. The second adjusting body 421 is sealed to the inner wall of the second oil passage 52. The second adjusting body 421 is provided with a fourth oil passage 4211, one end of which communicates with the second oil passage 52, and the other end communicates with the inner cavity of the nitrogen cylinder 1. One end of the adjusting core 422 is threaded to the second adjusting body 421, and the other end is connected to the fourth conical head 423, which is located inside the fourth oil passage 4211. This arrangement ensures that hydraulic oil entering the second oil passage 52 can only enter the fourth oil passage 4211. Turning the adjusting core 422 causes the fourth conical head 423 to move within the fourth oil passage 4211, thereby adjusting the amount of oil passing through the fourth oil passage 4211 per unit time. This completes the adjustment of the amount of oil passing through the second oil passage 52, achieving the purpose of hydraulic damping force adjustment.

[0075] In this embodiment, see Figure 2 The second adjusting component 42 employs a compression high-low speed regulating valve system assembly. The second adjusting body 421 is a high-low speed adjusting threaded positioning seat for the compression high-low speed regulating valve system assembly, the adjusting core 422 is the low-speed adjusting core of the compression high-low speed regulating valve system assembly, and the fourth conical head 423 is the conical head of the low-speed adjusting core of the compression high-low speed regulating valve system assembly. The specific structure of the compression high-low speed regulating valve system assembly is prior art in this field and will not be described in detail here.

[0076] Optionally, see Figure 1 and Figure 2 The nitrogen cylinder 1 is equipped with a movable dividing piston 11 along its extension direction. The dividing piston 11 is sealed to the inner wall of the nitrogen cylinder 1, dividing the inner cavity of the nitrogen cylinder 1 into an oil storage chamber 12 and a nitrogen chamber 13. The oil storage chamber 12 is connected to the second oil passage 52. The hydraulic oil in the first chamber 21 enters the oil storage cylinder 2 through the second oil passage 52. The pressure in the oil storage chamber 12 increases, which drives the dividing piston 11 to move towards the nitrogen chamber 13. The nitrogen in the nitrogen chamber 13 is compressed, generating a nitrogen counterforce.

[0077] For example, the nitrogen cylinder 1 is typically made of a high-strength metal (such as aluminum alloy or steel), has a cylindrical structure, and its inner wall is smooth and resistant to high pressure, which not only ensures that nitrogen does not leak, but also withstands the internal gas pressure. The specific structure of the nitrogen cylinder 1 is prior art in this field and will not be described in detail here.

[0078] Example 2

[0079] This embodiment provides a vibration reduction method for a nitrogen vibration damper, applicable to the nitrogen vibration damper of Embodiment 1, and includes the following steps:

[0080] According to the operating conditions of the nitrogen shock absorber, the position of the first adjustment component 41 in the first oil passage 51 is adjusted, and the position of the second adjustment component 42 in the second oil passage 52 is adjusted to change the amount of oil passing through the first oil passage 51 and the second oil passage 52 per unit time, thereby completing the adjustment of the hydraulic damping force.

[0081] Specifically, see Figure 4 and Figure 5 Turning the operating handle 412 causes the first adjusting body 411 to move the first conical head 413 within the first oil passage 51. This changes the amount of oil passing through the first oil passage 51 per unit time, thus altering the hydraulic damping force. (See reference...) Figure 2 Turning the adjusting core 422 causes the fourth conical head 423 to move within the fourth oil passage 4211. The amount of oil passing through the fourth oil passage 4211 per unit time changes, the amount of oil passing through the second oil passage 52 changes, and the hydraulic damping force changes accordingly, thus realizing the graded adjustment of the hydraulic damping force.

[0082] The buffer piston assembly 32 is driven to move towards the buffer tube 31, and the buffer piston assembly 32 squeezes the hydraulic oil in the first chamber 21. The first part of the hydraulic oil in the first chamber 21 flows into the second chamber 22 through the unblocked third oil passage. The second part of the hydraulic oil in the first chamber 21 enters the nitrogen cylinder 1 through the second oil passage 52. The third part of the hydraulic oil in the first chamber 21 enters the buffer tube 31 through the first oil passage 51. When the buffer piston assembly 32 is still in the second state, the third part of the hydraulic oil entering the buffer tube 31 can flow back to the first chamber 21 from the buffer tube 31. When the buffer piston assembly 32 is switched to the first state, the third part of the hydraulic oil entering the buffer tube 31 enters the second chamber 22 through the third oil passage connected to the buffer tube 31.

[0083] Specifically, when the relative positions of the buffer piston assembly 32 and the buffer tube 31 are different, the amount of oil entering the oil storage chamber 12 through the second oil passage 52 will be different, and the nitrogen counterforce generated by the nitrogen cylinder 1 will be different. At the same time, the path and distance of the hydraulic oil flowing between the first chamber 21 and the second chamber 22 will also be different, which will cause the generated compression damping force to change, thereby realizing the graded adjustment of the compression damping force.

[0084] Obviously, the above embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. A nitrogen vibration damper, characterized in that, include: A nitrogen cylinder (1) and an oil storage cylinder (2) are provided. The nitrogen cylinder (1) is located on one side of the oil storage cylinder (2) along the first direction. The first end of the oil storage cylinder (2) is provided with a first oil passage (51) and a second oil passage (52). The piston adjustment mechanism (3) includes a buffer tube (31) and a buffer piston assembly (32). The buffer tube (31) is disposed at the first end of the oil reservoir (2). The buffer piston assembly (32) is movably disposed in the inner cavity of the oil reservoir (2) along the axial direction of the oil reservoir (2), dividing the inner cavity of the oil reservoir (2) into a first chamber (21) and a second chamber (22). One end of the first oil passage (51) can communicate with the first chamber (21), and the other end can communicate with the inner cavity of the buffer tube (31). One end of the second oil passage (52) can communicate with the inner cavity of the oil reservoir (2). The first chamber (21) is connected, and the other end can be connected to the inner cavity of the nitrogen cylinder (1); the buffer piston assembly (32) is provided with a plurality of third oil passages, the first chamber (21) is connected to the second chamber (22) through the third oil passages, the buffer piston assembly (32) has a first state of being sleeved on the buffer tube (31) and a second state of being separated from the buffer tube (31). In the first state, at least one of the third oil passages can be connected to the inner cavity of the buffer tube (31), and part of the third oil passages are blocked by the buffer tube (31); The hydraulic adjustment mechanism includes a first adjustment component (41) and a second adjustment component (42). The first adjustment component (41) is movably disposed on one side of the oil reservoir (2) along the second direction and is used to adjust the amount of oil passing through the first oil passage (51) per unit time. The first adjustment component (41) is partially located outside the oil reservoir (2). The second adjustment component (42) is movably disposed inside the second oil passage (52) and is used to adjust the amount of oil passing through the second oil passage (52) per unit time. The first direction and the second direction are both radial directions of the oil reservoir (2) and are arranged at an angle.

2. The nitrogen vibration damper according to claim 1, characterized in that, The first adjustment component (41) includes a first adjustment body (411), an operating handle (412), and a first conical head (413). The first end of the oil reservoir (2) is provided with a connecting hole (53). One end of the connecting hole (53) is connected to the first oil passage (51), and the other end is connected to the outside of the oil reservoir (2). The first adjustment body (411) is movably disposed in the connecting hole (53) along the extension direction of the connecting hole (53) and is sealed to the hole wall of the connecting hole (53). The operating handle (412) is located outside the oil reservoir (2) and is threadedly connected to one end of the first adjustment body (411). The first conical head (413) is disposed at the other end of the first adjustment body (411) and is located in the first oil passage (51).

3. The nitrogen vibration damper according to claim 2, characterized in that, The first adjustment component (41) further includes an elastic limiting member (414) disposed on the first adjustment body (411). The hole wall of the connecting hole (53) is arranged in a stepped manner along the direction close to the first oil passage (51). The elastic limiting member (414) can contact the hole wall of the connecting hole (53) under its elastic force.

4. The nitrogen vibration damper according to claim 3, characterized in that, The elastic limiting member (414) includes an elastic part (4141) and a ball limiting part (4142). One end of the elastic part (4141) is connected to the first adjusting body (411), and the other end is in contact with the ball limiting part (4142). The ball limiting part (4142) can contact the hole wall of the connecting hole (53) under the elastic force of the elastic part (4141) and roll with the hole wall of the connecting hole (53).

5. The nitrogen vibration damper according to claim 1, characterized in that, The buffer piston assembly (32) includes a connecting pipe (321), a first buffer piston (322), and a second buffer piston (323). The first buffer piston (322) and the second buffer piston (323) are axially spaced on the connecting pipe (321) and are sealed to the inner wall of the oil reservoir (2). The first buffer piston (322) and the second buffer piston (323) are each provided with a first through hole (3221). The connecting pipe (321) is provided with a second through hole (3211) on its wall. The second through hole (3211) is located between the first buffer piston (322) and the second buffer piston (323). The inner cavity of the connecting pipe (321) is connected to the second chamber (22). In the first state, the buffer pipe (31) is inserted into the inner cavity of the connecting pipe (321).

6. The nitrogen vibration damper according to claim 5, characterized in that, The first end of the oil storage cylinder (2) is provided with a groove (54) communicating with the first chamber (21). In the first state, the end of the connecting pipe (321) facing the buffer pipe (31) can move into the groove (54).

7. The nitrogen vibration damper according to any one of claims 1-6, characterized in that, The piston adjustment mechanism (3) further includes a piston rod (33) and a third adjustment component (34). The piston rod (33) is movably passed through the second end of the oil reservoir (2) along the extension direction of the oil reservoir (2) and connected to the buffer piston assembly (32). The buffer piston assembly (32) is provided with a perforation (35) at one end near the piston rod (33). At least one of the third oil passages can communicate with the perforation (35). One end of the third adjustment component (34) is movably disposed on the piston rod (33) along the axial direction of the piston rod (33), and the other end is located in the perforation (35) for adjusting the amount of oil passing through the perforation (35) per unit time.

8. The nitrogen vibration damper according to any one of claims 1-6, characterized in that, The second adjustment component (42) includes a second adjustment body (421), an adjustment core (422), and a fourth conical head (423). The second adjustment body (421) is sealed to the inner wall of the second oil passage (52). The second adjustment body (421) is provided with a fourth oil passage (4211). One end of the fourth oil passage (4211) is connected to the second oil passage (52), and the other end is connected to the inner cavity of the nitrogen cylinder (1). One end of the adjustment core (422) is threaded to the second adjustment body (421), and the other end is connected to the fourth conical head (423). The fourth conical head (423) is located inside the fourth oil passage (4211).

9. The nitrogen vibration damper according to any one of claims 1-6, characterized in that, The nitrogen cylinder (1) is provided with a movable dividing piston (11) along its extension direction. The dividing piston (11) is sealed to the inner wall of the nitrogen cylinder (1) and divides the inner cavity of the nitrogen cylinder (1) into an oil storage chamber (12) and a nitrogen chamber (13). The oil storage chamber (12) is connected to the second oil passage (52).

10. A vibration reduction method for a nitrogen vibration damper, characterized in that, The nitrogen vibration damper as described in any one of claims 1-9 includes the following steps: According to the operating conditions used by the nitrogen shock absorber, the position of the first adjustment component (41) in the first oil passage (51) is adjusted, and the position of the second adjustment component (42) in the second oil passage (52) is adjusted, so as to change the amount of oil passing through the first oil passage (51) and the second oil passage (52) per unit time. The buffer piston assembly (32) is driven to move toward the buffer tube (31). The buffer piston assembly (32) squeezes the hydraulic oil in the first chamber (21). The first part of the hydraulic oil in the first chamber (21) flows into the second chamber (22) through the unblocked third oil passage. The second part of the hydraulic oil in the first chamber (21) enters the nitrogen cylinder (1) through the second oil passage (52). The third part of the hydraulic oil in the first chamber (21) enters the buffer tube (31) through the first oil passage (51). When the buffer piston assembly (32) is still in the second state, the third part of the hydraulic oil entering the buffer tube (31) can flow back to the first chamber (21) from the buffer tube (31). When the buffer piston assembly (32) is switched to the first state, the third part of the hydraulic oil entering the buffer tube (31) enters the second chamber (22) through the third oil passage connected to the buffer tube (31).

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