Nitrogen damper and damping method thereof

Abstract

The application belongs to the technical field of mechanical damping, and discloses a nitrogen damper and a damping method thereof. The nitrogen damper 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 the inner cavity of the oil storage cylinder into a first chamber and a second chamber. One end of a first oil passage of the oil storage cylinder is in communication with the first chamber, and the other end is in communication with the inner cavity of the buffer pipe. One end of a second oil passage of the oil storage cylinder is in communication with the first chamber, and the other end is in communication with the nitrogen cylinder. The first adjusting assembly of the hydraulic adjusting mechanism is used for adjusting the oil passing amount per unit time in the first oil passage, and the second adjusting assembly of the hydraulic adjusting mechanism is used for adjusting the oil passing amount per unit time in the second oil passage. The nitrogen damper has the function of damping force step adjustment, expands the adjustable range of the damping force, reduces the installation difficulty on the vehicle, and improves the efficiency of the damping force adjustment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of mechanical vibration damping, in particular to a nitrogen damper and a damping method thereof. BACKGROUND

[0002] The nitrogen damper is a high-efficiency damping device based on the compressibility of high-pressure nitrogen. It absorbs vibration energy through the compression and expansion process of the gas, and cooperates with a precisely designed hydraulic or mechanical damping system to achieve vibration control. As a core component of modern damping technology, the device has wide application value in vehicle suspension systems, industrial equipment, sports equipment and other fields.

[0003] In the prior art, when the damper reaches the limit compression stroke, the buffer piston enters the buffer sleeve and cooperates with the buffer sleeve to form a sealed chamber to realize the hydraulic buffer function. However, the buffer sleeve occupies the space inside the oil storage cylinder, causing the effective stroke of the buffer piston to be shortened, which not only causes metal fatigue and reduces passenger comfort, but also limits the range of adjustable damping force. Moreover, after long-term use, the buffer sleeve and the buffer piston will be stuck due to oil pollution or wear, affecting the adjustment effect of the damping force.

[0004] In addition, a compression hydraulic buffer adjustment valve assembly is arranged between the oil storage cylinder and the nitrogen cylinder of the damper for step adjustment of the hydraulic damping force. However, the valve group is generally integrated by multiple adjustment valves, which increases the overall volume of the damper. In the application scenarios such as rally cars where space is limited, the installation difficulty of the damper is increased, and the complexity of the overall vehicle layout is significantly improved. Moreover, the adjustment components of the valve group are generally arranged inside, which requires the use of external driving devices for adjustment, and the operation is relatively inconvenient, affecting the efficiency of damping force adjustment.

[0005] Therefore, there is an urgent need for a nitrogen damper and a damping method thereof to solve the above problems. SUMMARY

[0006] The purpose of the present application is to provide a nitrogen damper and a damping method thereof, which has the function of step adjustment of damping force, effectively avoids the occurrence of sudden increase of damping force, expands the range of adjustable damping force, reduces the installation difficulty of the nitrogen damper on the vehicle, and improves the convenience and efficiency of damping force adjustment.

[0007] To achieve this purpose, the present application adopts the following technical solutions:

[0008] In a first aspect, a nitrogen damper is provided, comprising:

[0009] a nitrogen cylinder and an oil storage cylinder, the nitrogen cylinder being located on one side of the oil storage cylinder along a first direction, and the first end of the oil storage cylinder being provided with a first oil passage and a second oil passage;

[0010] The piston adjusting mechanism comprises a buffer pipe and a buffer piston assembly, the buffer pipe is arranged at the first end of the oil storage cylinder, the buffer piston assembly is movably arranged in the inner cavity of the oil storage cylinder along the axial direction of the oil storage cylinder, and the inner cavity of the oil storage cylinder is divided into a first chamber and a second chamber, one end of the first oil passage is in communication with the first chamber, and the other end is in communication with the inner cavity of the buffer pipe, one end of the second oil passage is in communication with the first chamber, and the other end is in communication with the inner cavity of the nitrogen cylinder, a plurality of third oil passages are arranged on the buffer piston assembly, the first chamber is in communication with the second chamber through the third oil passages, the buffer piston assembly has a first state of being sleeved on the buffer pipe and a second state of being separated from the buffer pipe, in the first state, at least one third oil passage is in communication with the inner cavity of the buffer pipe, and part of the third oil passages are blocked by the buffer pipe.

[0011] The hydraulic adjusting mechanism comprises a first adjusting assembly and a second adjusting assembly, the first adjusting assembly is movably arranged on one side of the oil storage cylinder along the second direction, is used for adjusting the oil passing amount per unit time in the first oil passage, and part of the first adjusting assembly is located outside the oil storage cylinder, the second adjusting assembly is movably arranged in the second oil passage, and is used for adjusting the oil passing amount per unit time in the second oil passage, and the first direction and the second direction are both radial directions of the oil storage cylinder and are arranged at an angle.

[0012] Optionally, the first adjusting assembly comprises a first adjusting body, an operation handle and a first conical head, the first end of the oil storage cylinder is provided with a connecting hole, one end of the connecting hole is in communication with the first oil passage, and the other end is in communication with the outside of the oil storage cylinder, the first adjusting body is movably arranged in the connecting hole along the extension direction of the connecting hole and is in sealing connection with the hole wall of the connecting hole, the operation handle is located outside the oil storage cylinder and is in threaded connection with one end of the first adjusting body, and the first conical head is arranged at the other end of the first adjusting body and is located in the communication of the first oil passage.

[0013] Optionally, the first adjusting assembly further comprises an elastic limiting piece arranged on the first adjusting body, 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 piece can be in contact with the hole wall of the connecting hole under the action of the elastic force thereof.

[0014] Optionally, the elastic limiting piece comprises an elastic part and a ball limiting part, one end of the elastic part is connected with the first adjusting body, the other end is in contact with the ball limiting part, the ball limiting part can be in contact with the hole wall of the connecting hole under the action of the elastic force of the elastic part, and is in rolling connection with the hole wall of the connecting hole.

[0015] Optionally, the buffer piston assembly comprises a connecting pipe, a first buffer piston and a second buffer piston, the first buffer piston and the second buffer piston are sleeved on the connecting pipe in the axial direction of the connecting pipe and are in sealing fit with the inner wall of the oil storage cylinder, the first buffer piston and the second buffer piston are both provided with a first through hole, the pipe wall of the connecting pipe is provided with a second through hole, the second through hole is located between the first buffer piston and the second buffer piston, the inner cavity of the connecting pipe is in communication with the second cavity, and 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 storage cylinder is provided with a groove in communication with the first cavity, and in the first state, the end of the connecting pipe facing the buffer pipe can be moved into the groove.

[0017] Optionally, the piston adjusting mechanism further comprises a piston rod and a third adjusting assembly, the piston rod is movably arranged through the second end of the oil storage cylinder in the extension direction of the oil storage cylinder and is connected with the buffer piston assembly, the end of the buffer piston assembly close to the piston rod is provided with a perforation, at least one third oil passing channel is in communication with the perforation, one end of the third adjusting assembly is movably arranged on the piston rod in the axial direction of the piston rod, and the other end is located in the perforation and is used for adjusting the oil passing amount per unit time in the perforation.

[0018] Optionally, the second adjusting assembly comprises a second adjusting body, an adjusting core and a fourth tapered head, the second adjusting body is in sealing connection with the inner wall of the second oil passing channel, the second adjusting body is provided with a fourth oil passing channel, one end of the fourth oil passing channel is in communication with the second oil passing channel, and the other end is in communication with the inner cavity of the nitrogen cylinder, one end of the adjusting core is in threaded connection with the second adjusting body, and the other end is connected with the fourth tapered head, and the fourth tapered head is located in the fourth oil passing channel.

[0019] Optionally, the nitrogen cylinder is provided with a separation piston movably arranged in the extension direction thereof, the separation piston is in sealing fit with the inner wall of the nitrogen cylinder and separates the inner cavity of the nitrogen cylinder into an oil storage cavity and a nitrogen cavity, and the oil storage cavity is in communication with the second oil passing channel.

[0020] In the second aspect, a damping method of a nitrogen damper is provided, which is suitable for the nitrogen damper described above and comprises the following steps:

[0021] According to the working conditions of the nitrogen damper, the position of the first adjusting assembly in the first oil passing channel is adjusted, and the position of the second adjusting assembly in the second oil passing channel is adjusted, so as to change the oil passing amount per unit time in the first oil passing channel and the second oil passing channel.

[0022] The driving buffer piston assembly moves in the direction of the buffer tube, the buffer piston assembly extrudes the hydraulic oil in the first chamber, the first part of the hydraulic oil in the first chamber flows into the second chamber through the unblocked third oil passage, the second part of the hydraulic oil in the first chamber enters the nitrogen cylinder through the second oil passage, and the third part 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 part 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 part of the hydraulic oil entering the buffer tube enters the second chamber through the third oil passage communicating with the buffer tube.

[0023] Compared with the prior art, the nitrogen shock absorber has the following beneficial effects:

[0024] The nitrogen shock absorber and the damping method thereof are provided, one end of the first oil passage is communicated with the first chamber, and the other end is communicated with the buffer tube, so that the third part of the hydraulic oil in the first chamber can enter the buffer tube through the first oil passage, and the damping force can be adjusted by adjusting the oil flow amount per unit time in the first oil passage through the first adjusting assembly. When the buffer piston assembly moves in the oil storage cylinder, the second part of the hydraulic oil in the first chamber can enter the nitrogen cylinder through the second oil passage, the amount of hydraulic oil in the nitrogen cylinder changes and can generate a damping force; and the damping force can be further adjusted by adjusting the oil flow amount per unit time in the second oil passage through the second adjusting assembly. The nitrogen shock absorber provided by the application can achieve the purpose of graded adjustment of the damping force through the first adjusting assembly and the second adjusting assembly, wherein the first adjusting assembly is located on the two sides of the nitrogen cylinder in different directions of the oil storage cylinder, only the second adjusting assembly is arranged between the nitrogen cylinder and the oil storage cylinder, compared with the prior art, the space occupied by the hydraulic adjusting mechanism can be significantly reduced, and the installation difficulty of the nitrogen shock absorber on the vehicle is reduced. In addition, the first adjusting assembly is partially located outside the oil storage cylinder, so that the staff can directly operate the first adjusting assembly without using other external driving devices, and the convenience and efficiency of the damping force adjustment are significantly improved.

[0025] When the buffer piston assembly moves in the oil storage cylinder, the volume of the first chamber changes, and no matter what state the hydraulic oil in the first chamber is, the hydraulic oil can be divided into three parts and flow out smoothly and stably, and the damping force generated by the flow of the hydraulic oil is different when the number of blocked third oil passages is different. Not only the graded adjustment of the damping force is realized, but also the sudden increase of the damping force is effectively avoided, and the comfort of the passengers is ensured. Compared with the prior art, the nitrogen shock absorber provided by the application does not need to be provided with a buffer sleeve, which not only helps to avoid the occurrence of buffer piston assembly jamming phenomenon and improves the sensitivity of the buffer, but also enables the buffer piston assembly to move along the full length of the oil storage cylinder, thereby expanding the moving path of the buffer piston assembly and the adjustable range of the damping force. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A cross-sectional view of an oil reservoir of a nitrogen damper according to the present application;

[0027] Figure 2 A cross-sectional view of a nitrogen cylinder of a nitrogen damper according to the present application;

[0028] Figure 3 A schematic view of the flow direction of hydraulic oil in a first chamber when a buffer piston assembly of a nitrogen damper according to the present application is in a second state;

[0029] Figure 4 A cross-sectional view of a first adjusting assembly of a nitrogen damper according to the present application;

[0030] Figure 5 A first schematic view of the flow direction of hydraulic oil in a first chamber when a buffer piston assembly of a nitrogen damper according to the present application is in a first state;

[0031] Figure 6 A second schematic view of the flow direction of hydraulic oil in a first chamber when a buffer piston assembly of a nitrogen damper according to the present application is in a first state;

[0032] Figure 7 A third schematic view of the flow direction of hydraulic oil in a first chamber when a buffer piston assembly of a nitrogen damper according to the present application is in a first state.

[0033] In the drawings:

[0034] 1. nitrogen cylinder; 11. partition piston; 12. oil reservoir chamber; 13. nitrogen chamber;

[0035] 2. oil reservoir; 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. top rod; 342. second conical head; 35. through hole;

[0037] 41. first adjusting assembly; 411. first adjusting body; 412. operation handle; 4121. operation part; 4122. screw; 413. first conical head; 414. elastic limiting part; 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 passing channel; 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 assembly. DETAILED DESCRIPTION

[0041] The application will be further described below in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are merely intended for the purpose of interpretation of the present application and are not intended to limit the present application. In addition, it should be noted that only the parts related to the present application are shown in the drawings for the purpose of description.

[0042] In the description of the present application, unless otherwise explicitly specified and limited, the terms "connected", "connected", "fixed" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0043] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0044] In the description of the present embodiment, the terms "up", "down", "right", and other orientation or position relationships are based on the orientation or position relationship shown in the drawings, and are only for the purpose of description and simplification of operation, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used to distinguish in description and have no special meaning.

[0045] Embodiment one

[0046] As Figures 1 to 7The embodiment shown provides a nitrogen shock absorber with a damping force grading adjustment function, effectively avoids the occurrence of sudden increase of damping force, expands the range of adjustable damping force, reduces the installation difficulty of the nitrogen shock absorber on the vehicle, and improves the convenience and efficiency of damping force adjustment.

[0047] Referring to Figure 1 , Figure 2 and Figure 3 , the nitrogen shock absorber comprises a nitrogen cylinder 1, an oil storage cylinder 2, a piston adjustment mechanism 3 and a hydraulic adjustment mechanism, the nitrogen cylinder 1 is located on one side of the oil storage cylinder 2 along a first direction, and 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 comprises a buffer pipe 31 and a buffer piston assembly 32, the buffer pipe 31 is arranged at the first end of the oil storage cylinder 2, the buffer piston assembly 32 is movably arranged in the inner cavity of the oil storage cylinder 2 along the axial direction of the oil storage cylinder 2, and divides the inner cavity of the oil storage cylinder 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 communicates with the inner cavity of the buffer pipe 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; a plurality of third oil passages are arranged on the buffer piston assembly 32, the first chamber 21 communicates with the second chamber 22 through the third oil passages, the buffer piston assembly 32 has a first state of being sleeved on the buffer pipe 31 and a second state of being separated from the buffer pipe 31, in the first state, at least one third oil passage can communicate with the inner cavity of the buffer pipe 31, and part of the third oil passages are blocked by the buffer pipe 31; the hydraulic adjustment mechanism comprises a first adjustment assembly 41 and a second adjustment assembly 42, the first adjustment assembly 41 is movably arranged on one side of the oil storage cylinder 2 along a second direction, used for adjusting the oil passage amount per unit time in the first oil passage 51, and part of the first adjustment assembly 41 is located outside the oil storage cylinder 2, the second adjustment assembly 42 is movably arranged in the second oil passage 52, used for adjusting the oil passage amount per unit time in the second oil passage 52, and the first direction and the second direction are both radial directions of the oil storage cylinder 2 and are arranged at an angle. Wherein, the first end and the second end are respectively two ends of the oil storage cylinder 2 along the extension direction thereof.

[0048] The nitrogen damper provided by the embodiment has one end of the first oil passage 51 communicated with the first chamber 21 and the other end communicated with the buffer tube 31, so that the third part of the hydraulic oil in the first chamber 21 can enter the buffer tube 31 through the first oil passage 51, and the damping force can be adjusted by adjusting the amount of oil passing through the first oil passage 51 per unit time through the first adjusting assembly 41. When the buffer piston assembly 32 moves in the oil storage cylinder 2, the second part of the hydraulic oil in the first chamber 21 can enter the nitrogen cylinder 1 through the second oil passage 52, the amount of hydraulic oil in the nitrogen cylinder 1 changes and can generate a damping force; at the same time, the damping force can be further adjusted by adjusting the amount of oil passing through the second oil passage 52 per unit time through the second adjusting assembly 42. The nitrogen damper provided by the present application can achieve the purpose of graded adjustment of damping force through the first adjusting assembly 41 and the second adjusting assembly 42, wherein the first adjusting assembly 41 is located on the two sides of the nitrogen cylinder 1 in different directions of the oil storage cylinder 2, and only the second adjusting assembly 42 is arranged between the nitrogen cylinder 1 and the oil storage cylinder 2. Compared with the prior art, the space occupied by the hydraulic adjusting mechanism can be significantly reduced, and the installation difficulty of the nitrogen damper on the vehicle is reduced. In addition, the first adjusting assembly 41 is partially located outside the oil storage cylinder 2, so that the staff can directly operate the first adjusting assembly 41 without using other external driving devices, which significantly improves the convenience and efficiency of damping force adjustment.

[0049] When the buffer piston assembly 32 moves in the oil storage cylinder 2, the volume of the first chamber 21 changes, and no matter what state the hydraulic oil in the first chamber 21 is, it can be divided into three parts and flow out smoothly and stably. Moreover, when the number of blocked third oil passages is different, the damping force generated by the flow of hydraulic oil will also be different, not only achieving graded adjustment of damping force, but also effectively avoiding the occurrence of sudden increase of damping force, ensuring the comfort of the passengers. Compared with the prior art, the nitrogen damper provided by the present application does not need to set a buffer sleeve, which not only helps to avoid the occurrence of buffer piston assembly 32 jamming phenomenon, improves the sensitivity of the buffer, but also enables the buffer piston assembly 32 to move along the full length of the oil storage cylinder 2, thereby expanding the moving distance of the buffer piston assembly 32 and the range of adjustable damping force.

[0050] For example, the buffer sleeve occupies a distance of 15mm~20mm of the oil storage cylinder 2 along its extension direction, so that the moving distance of the buffer piston assembly 32 of the nitrogen damper provided by the embodiment can be expanded by at least 15mm~20mm.

[0051] Optionally, referring to Figure 3 , Figure 4 and Figure 5The first adjusting assembly 41 comprises a first adjusting body 411, an operating handle 412 and a first tapered head 413. The first end of the oil storage cylinder 2 is provided with a connecting hole 53, one end of which is in communication with the first oil passing channel 51, and the other end is in communication with the outside of the oil storage cylinder 2. The first adjusting body 411 is movably arranged in the connecting hole 53 along the extension direction of the connecting hole 53 and is in sealing connection with the hole wall of the connecting hole 53. The operating handle 412 is located outside the oil storage cylinder 2 and is in threaded connection with one end of the first adjusting body 411. The first tapered head 413 is arranged at the other end of the first adjusting body 411 and is located in the communication of the first oil passing channel 51. The operating handle 412 is arranged to facilitate the staff to adjust the position of the first adjusting body 411, thereby improving the convenience of operation. The first tapered head 413 is a cone, which occupies part of the space of the communication of the first oil passing channel 51, so that the amount of hydraulic oil flowing through the gap between the first tapered head 413 and the channel wall of the first oil passing channel 51 will be different, thereby affecting the hydraulic damping force. By screwing the operating handle 412, the first adjusting body 411 will move along the extension direction of the connecting hole 53 and drive the first tapered head 413 to move. The position of the first tapered head 413 in the first oil passing channel 51 changes, and the distance between the first tapered head 413 and the channel wall of the first oil passing channel 51 changes, thereby achieving the purpose of changing the oil passing amount per unit time in the first oil passing channel 51 and completing the adjustment of the hydraulic damping force.

[0052] Specifically, referring to Figure 4 and Figure 5 , the connecting hole 53 is arranged at an angle with the first oil passing channel 51, and the maximum cross-sectional diameter of the first tapered head 413 is the same as the diameter of the first oil passing channel 51, so that the first tapered head 413 has a limit position for plugging the first oil passing channel 51.

[0053] In this embodiment, referring to Figure 4 and Figure 5 , the first adjusting assembly 41 further comprises an elastic limiting piece 414 arranged on the first adjusting body 411. The hole wall of the connecting hole 53 is arranged in a stepped manner along the direction close to the first oil passing channel 51, and the elastic limiting piece 414 can be in contact with the hole wall of the connecting hole 53 under the action of its elastic force. In this way, the connecting hole 53 is a stepped hole, and the stepped surface of the connecting hole 53 can limit the position of the elastic limiting piece 414 therein, so that when the operating handle 412 is not screwed, the position of the first adjusting body 411 in the connecting hole 53 will not change, that is, the oil passing amount per unit time in the first oil passing channel 51 is fixed, and the hydraulic damping force is fixed. When the operating handle 412 is screwed, the deformation amount of the elastic limiting piece 414 changes, and at this time the first adjusting body 411 can move in the connecting hole 53 to adjust the hydraulic damping force.

[0054] Specifically, referring to Figure 4 and Figure 5The elastic limiting piece 414 comprises an elastic part 4141 and a ball limiting part 4142. One end of the elastic part 4141 is connected with the first adjusting body 411, and the other end is in contact with the ball limiting part 4142. The ball limiting part 4142 can be in contact with the hole wall of the connecting hole 53 under the elastic force of the elastic part 4141, and is in rolling fit with the hole wall of the connecting hole 53. In this way, when the first adjusting body 411 is installed into the connecting hole 53, the hole wall of the connecting hole 53 will extrude the elastic part 4141 through the ball limiting part 4142, so that the elastic part 4141 is deformed to accumulate elastic potential energy. With the change of the position of the first adjusting body 411, the continued elastic potential energy of the elastic part 4141 is different, so that the ball limiting part 4142 can always be in contact with the hole 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 piece 414 and the hole wall of the connecting hole 53, reduce the driving force of the operator rotating the handle 412, and make it more convenient for the operator to operate.

[0055] Exemplarily, the ball limiting part 4142 adopts a ball bearing, and the elastic part 4141 adopts a spring.

[0056] Specifically, a plurality of elastic limiting pieces 414 are arranged, and the plurality of elastic limiting pieces 414 are arranged along the circumference of the first adjusting body 411, so that the circumference of the first adjusting body 411 can be uniformly constrained, and the stability of the limiting of the first adjusting body 411 is improved.

[0057] In the embodiment, referring to Figure 4 and Figure 5 , the first adjusting assembly 41 further comprises a first sealing ring 415 sleeved on the first adjusting body 411. The first adjusting body 411 is in sealed connection with the hole wall of the connecting hole 53 through the first sealing ring 415, so as to ensure that the hydraulic oil in the first oil passage 51 will not leak through the connecting hole 53.

[0058] Referring to Figure 4 and Figure 5 , the operating handle 412 is partially located in the connecting hole 53. The part of the operating handle 412 located in the connecting hole 53 is provided with a second sealing ring 416 between the operating handle 412 and the hole wall of the connecting hole 53, so that the operating handle 412 can be in sealed connection with the hole wall of the connecting hole 53, and the sealing performance is further improved.

[0059] In the embodiment, referring to Figure 4 and Figure 5 , the operating handle 412 comprises 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 in threaded connection with the first adjusting body 411 through the screw 4122.

[0060] Exemplarily, the screw 4122 is a countersunk torx screw 4122.

[0061] In this embodiment, referring to Figure 4 and Figure 5 The first end of the oil storage cylinder 2 is provided with a first connecting seat 5 in sealing connection with the first end, the first connecting seat 5 can block the cylinder opening of the oil storage cylinder 2, the nitrogen damper can be connected with the external structure through the first connecting seat 5, and the first oil passing channel 51, the second oil passing channel 52, the connecting hole 53 and the buffer tube 31 are all arranged in the first connecting seat 5.

[0062] Optionally, referring to Figure 2 The buffer piston assembly 32 includes a connecting tube 321, a first buffer piston 322 and a second buffer piston 323, the first buffer piston 322 and the second buffer piston 323 are sleeved on the connecting tube 321 in the axial direction and are in sealing cooperation with the inner wall of the oil storage cylinder 2, so as to divide the inner cavity of the oil storage cylinder 2 into the first chamber 21 and the second chamber 22; the first buffer piston 322 and the second buffer piston 323 are both provided with a first through hole 3221, the connecting tube 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 tube 321 is in communication with the second chamber 22, and the buffer tube 31 is inserted into the inner cavity of the connecting tube 321 in the first state. In this way, the inner cavity of the connecting tube 321 can form a third oil passing channel, part of the inner cavity of the connecting tube 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 jointly form a third oil passing channel, the first through hole 3221 on the first buffer piston 322, 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 jointly form a third oil passing channel, and the hydraulic oil can flow between the first chamber 21 and the second chamber 22.

[0063] In this embodiment, referring to Figure 5The first buffer piston 322 and the second buffer piston 323 are both provided with a plurality of first through holes 3221, the plurality of first through holes 3221 of the first buffer piston 322 are arranged along the circumference of the first buffer piston 322, the plurality of first through holes 3221 of the second buffer piston 323 correspond to the plurality of first through holes 3221 of the first buffer piston 322 one by one, and each first through hole 3221 of the first buffer piston 322 and the corresponding first through hole 3221 of the second buffer piston 323 can form a third oil passage, thereby significantly increasing the number of the third oil passages. The connecting pipe 321 is provided with a plurality of second through holes 3211 on the pipe wall, and the plurality of second through holes 3211 are arranged along the circumference of the connecting pipe 321. In this way, the number of the third oil passages can be further increased. The buffer pipe 31 is provided with a plurality of third through holes 311 on the pipe wall, and the plurality of third through holes 311 are arranged along the extension direction of the buffer pipe 31. When the buffer piston assembly 32 is sleeved on the buffer pipe 31, a part of the hydraulic oil in the first chamber 21 can flow to the inner cavity of the connecting pipe 321 through the third through holes 311 and the inner cavity of the buffer pipe 31, thereby increasing the flow path of the hydraulic oil in the first chamber 21 and helping to further avoid the sudden increase of the damping force, thereby ensuring the comfort of the passenger.

[0064] Specifically, referring to Figure 5 and Figure 5 , when the buffer piston assembly 32 moves towards the buffer pipe 31 and is in the second state, the first part of the hydraulic oil in the first chamber 21 can not only enter the inner cavity of the connecting pipe 321, but also flow into the first through holes 3221 of the first buffer piston 322; the second part of the hydraulic oil in the first chamber 21 enters the nitrogen cylinder 1 through the second oil passage 52, and the nitrogen counterforce is generated in the nitrogen cylinder 1; the third part of the hydraulic oil in the first chamber 21 enters the buffer pipe 31 through the first oil passage 51 and flows back to the first chamber 21 from the buffer pipe 31; wherein the arrows represent the flow direction of the hydraulic oil. At this time, the compression damping force of the nitrogen damper as a whole is small.

[0065] Referring to Figure 2 and Figure 3, the first part of the hydraulic oil in the first chamber 21 will flow 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, and the nitrogen back pressure increases; the third part of the hydraulic oil can enter the buffer pipe 31 through the first oil passage 51 and 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 towards the second chamber 22. At this time, the hydraulic oil in the second chamber 22 increases, the pushing force of the hydraulic oil on the buffer piston assembly 32 increases, and the flow path of the hydraulic oil also increases, so that the compression damping force of the nitrogen damper as a whole increases compared with the second state.

[0066] Referring to Figure 2 and Figure 5 , the buffer piston assembly 32 continues to move towards the first end of the oil storage cylinder 2, and the plurality of third through holes 311 will be sequentially blocked by the pipe wall of the connecting pipe 321, and the damping force increases. Referring to Figure 2 , after the plurality of third through holes 311 are all blocked, the third part of the hydraulic oil can only enter the buffer pipe 31 through the first oil passage 51. Referring to Figure 6 , when the buffer piston assembly 32 moves to the pipe wall of the buffer pipe 31 to block the second through hole 3211, the hydraulic oil in the connecting pipe 321 can only flow in the extension direction of the connecting pipe 321, and cannot enter the gap between the first buffer piston 322 and the second buffer piston 323 any more, so that the damping force will further increase.

[0067] In the above process, the nitrogen damper is in a compression state, and the damping force generated by the movement of the buffer piston assembly 32 gradually increases. When the nitrogen damper is in a rebound state, the buffer piston assembly 32 will move away from the first end of the oil storage cylinder 2 (X negative in Figure 7 ), and the flow path of the hydraulic oil changes in the order opposite to the above process.

[0068] In this embodiment, referring to Figure 7 , the first end of the oil storage cylinder 2 is provided with a groove 54 in communication with the first chamber 21, and the end of the connecting pipe 321 towards the buffer pipe 31 can move into the groove 54 in the first state. The end of the connecting pipe 321 towards the buffer pipe 31 is closer to the first end of the oil storage cylinder 2 than the first buffer piston 322, so that the setting of the groove 54 can ensure that the first buffer piston 322 can move to the end of the oil storage cylinder 2, and compared with the buffer sleeve in the prior art, the movement path of the buffer piston assembly 32 is further expanded, and the range of adjustable damping force is expanded.

[0069] Specifically, referring to Figure 3 , the recess 54 is arranged on the first connecting seat 5.

[0070] Optionally, referring to Figure 7 and Figure 7 , the piston adjusting mechanism 3 further comprises a piston rod 33 and a third adjusting assembly 34, the piston rod 33 is movably arranged through the second end of the oil storage cylinder 2 along the extension direction of the oil storage cylinder 2 and connected with the buffer piston assembly 32, the buffer piston assembly 32 is provided with a through hole 35 at one end close to the piston rod 33, at least one third oil passing channel is in communication with the through hole 35, one end of the third adjusting assembly 34 is movably arranged 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, for adjusting the oil passing amount per unit time in the through hole 35. When the nitrogen gas damper is compressed or rebounded, the external structure will drive the piston rod 33 to move, and the piston rod 33 drives the buffer piston assembly 32 to move in the oil storage cylinder 2. The other end of the third adjusting assembly 34 is located in the through hole 35, which will occupy the space of the through hole 35, and thus when the third adjusting assembly 34 moves, the space occupied by the third adjusting assembly 34 in the through hole 35 changes, so that the amount of hydraulic oil entering the through hole 35 through the third oil passing channel changes, realizing further adjustment of the damping force.

[0071] In this embodiment, referring to Figure 1 and Figure 3 , the third oil passing channel formed by the inner cavity of the connecting pipe 321 is in communication with the through hole 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 passing channel, which is in communication with the through hole 35.

[0072] Specifically, referring to Figure 1 and Figure 3 , the nitrogen gas damper further comprises a second connecting seat 6, the piston rod 33 extends along the X direction, and the end away from the oil storage cylinder 2 is connected with the external structure through the second connecting seat 6, and the through hole 35 extends along the Y direction; the third adjusting assembly 34 comprises a top rod 341 movably arranged through the piston rod 33 along the X direction and a second conical head 342 arranged at the end of the top rod 341, and the second connecting seat 6 is provided with a third conical head 61 movably arranged along the Y direction, and the conical surface of the third conical head 61 is in contact with the top rod 341. When the third conical head 61 is driven to move along the Y direction, the third conical head 61 can push the top rod 341 to move along the X direction through the conical surface, and the top rod 341 drives the second conical head 342 to move in the through hole 35, thereby realizing adjustment of the oil passing amount per unit time in the through hole 35.

[0073] In this embodiment, referring toFigure 1 A guide assembly 7 is arranged between the piston rod 33 and the oil storage cylinder 2, and is used to constrain the moving direction of the piston rod 33 and is in sealing connection with the piston rod 33 and the oil storage cylinder 2. The specific structure of the guide assembly 7 is the prior art in the field, and will not be described here.

[0074] Optionally, referring to Figure 3 The second adjusting assembly 42 comprises a second adjusting body 421, an adjusting core 422 and a fourth tapered head 423. The second adjusting body 421 is in sealing connection with the inner wall of the second oil passing channel 52. The second adjusting body 421 is provided with a fourth oil passing channel 4211. One end of the fourth oil passing channel 4211 is in communication with the second oil passing channel 52, and the other end is in communication with the inner cavity of the nitrogen cylinder 1. One end of the adjusting core 422 is in threaded connection with the second adjusting body 421, and the other end is connected with the fourth tapered head 423. The fourth tapered head 423 is located in the fourth oil passing channel 4211. In this way, the hydraulic oil entering the second oil passing channel 52 can only enter the fourth oil passing channel 4211. By screwing the adjusting core 422, the fourth tapered head 423 is moved in the fourth oil passing channel 4211 driven by the adjusting core 422, so as to realize the adjustment of the oil passing amount per unit time in the fourth oil passing channel 4211, complete the adjustment of the oil passing amount in the second oil passing channel 52, and achieve the purpose of adjusting the hydraulic damping force.

[0075] In this embodiment, referring to Figure 1 The second adjusting assembly 42 adopts a compression high-low speed adjusting valve assembly. The second adjusting body 421 is a high-low speed adjusting threaded positioning seat of the compression high-low speed adjusting valve assembly. The adjusting core 422 is a low speed adjusting core of the compression high-low speed adjusting valve assembly. The fourth tapered head 423 is a tapered head of the low speed adjusting core of the compression high-low speed adjusting valve assembly. The specific structure of the compression high-low speed adjusting valve assembly is the prior art in the field, and will not be described here.

[0076] Optionally, referring to Figure 2 and Figure 2 The nitrogen cylinder 1 is provided with a partitioning piston 11 which is movable along the extension direction of the nitrogen cylinder 1. The partitioning piston 11 is in sealing cooperation with the inner wall of the nitrogen cylinder 1, and divides the inner cavity of the nitrogen cylinder 1 into an oil storage cavity 12 and a nitrogen cavity 13. The oil storage cavity 12 is in communication with the second oil passing channel 52. The hydraulic oil in the first cavity 21 enters the oil storage cylinder 2 through the second oil passing channel 52. The pressure in the oil storage cavity 12 increases, which drives the partitioning piston 11 to move towards the nitrogen cavity 13. The nitrogen in the nitrogen cavity 13 is compressed, and the nitrogen counteracting force is generated.

[0077] Exemplarily, the nitrogen cylinder 1 is usually made of high-strength metal (such as aluminum alloy or steel), in a cylindrical structure, with smooth inner wall and high pressure resistance, which can not only ensure that the nitrogen does not leak, but also can withstand the internal gas pressure. The specific structure of the nitrogen cylinder 1 is the prior art in the field, which will not be described here.

[0078] Embodiment two

[0079] The embodiment provides a damping method of a nitrogen damper, which is suitable for the nitrogen damper of embodiment one, and includes the following steps:

[0080] According to the working condition of the nitrogen damper, the positions of the first adjusting assembly 41 in the first oil passage 51 and the second adjusting assembly 42 in the second oil passage 52 are adjusted to change the oil passing amount per unit time in the first oil passage 51 and the second oil passage 52, so as to complete the adjustment of the hydraulic damping force.

[0081] Specifically, referring to Figure 1 and Figure 2 , the operation handle 412 is screwed, the first adjusting body 411 drives the first conical head 413 to move in the first oil passage 51, the oil passing amount per unit time in the first oil passage 51 changes, the oil passing amount of the first oil passage 51 changes, and the hydraulic damping force changes. Referring to Figure 4 Figure 5 Figure 2 , the adjusting core 422 is screwed, the adjusting core 422 drives the fourth conical head 423 to move in the fourth oil passage 4211, the oil passing amount per unit time in the fourth oil passage 4211 changes, the oil passing amount of the second oil passage 52 changes, the hydraulic damping force changes, and the step-by-step adjustment of the hydraulic damping force is realized.

[0082] The buffer piston assembly 32 is driven to move towards the buffer pipe 31, the buffer piston assembly 32 extrudes the hydraulic oil in the first chamber 21, a first part of the hydraulic oil in the first chamber 21 flows into the second chamber 22 through the unblocked third oil passage, a second part of the hydraulic oil in the first chamber 21 enters the nitrogen cylinder 1 through the second oil passage 52, and a third part of the hydraulic oil in the first chamber 21 enters the buffer pipe 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 pipe 31 can flow back to the first chamber 21 from the buffer pipe 31; when the buffer piston assembly 32 is switched to the first state, the third part of the hydraulic oil entering the buffer pipe 31 enters the second chamber 22 through the third oil passage communicating with the buffer pipe 31.

[0083] Specifically, when the relative position between the buffer piston assembly 32 and the buffer tube 31 is different, the amount of oil entering the oil storage cavity 12 via the second oil passage 52 is different, the nitrogen counterforce generated by the nitrogen cylinder 1 is different; at the same time, the path and distance of the hydraulic oil flowing between the first chamber 21 and the second chamber 22 are also different, so that the generated compression damping force changes, thereby realizing the step adjustment of the compression damping force.

[0084] Obviously, the above embodiments of the present application are only examples for clearly illustrating the present application, and are not intended to limit the implementation modes of the present application. For those skilled in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present application. Here, it is not necessary and also impossible to enumerate all the implementation modes. Any modification, equivalent substitution and improvement within the spirit and principle of the present application shall be included in the protection scope of the claims of the present application.

Claims

1. Nitrogen damper, characterized in that The application relates to a nitrogen cylinder (1) and an oil storage cylinder (2), wherein the nitrogen cylinder (1) is located on one side of the oil storage cylinder (2) along a first direction, and a first oil passing channel (51) and a second oil passing channel (52) are arranged at the first end of the oil storage cylinder (2); a piston adjusting mechanism (3) is arranged on the first end of the oil storage cylinder (2) and comprises a buffer pipe (31) and a buffer piston assembly (32), the buffer piston assembly (32) is movably arranged in the inner cavity of the oil storage cylinder (2) along the axial direction of the oil storage cylinder (2) and divides the inner cavity of the oil storage cylinder (2) into a first cavity (21) and a second cavity (22), one end of the first oil passing channel (51) is in communication with the first cavity (21), and the other end is in communication with the inner cavity of the buffer pipe (31); one end of the second oil passing channel (52) is in communication with the first cavity (21), and the other end is in communication with the inner cavity of the nitrogen cylinder (1); a plurality of third oil passing channels are arranged on the buffer piston assembly (32), the first cavity (21) is in communication with the second cavity (22) through the third oil passing channels, the buffer piston assembly (32) has a first state of being sleeved on the buffer pipe (31) and a second state of being separated from the buffer pipe (31), in the first state, at least one third oil passing channel is in communication with the inner cavity of the buffer pipe (31), and part of the third oil passing channels are blocked by the buffer pipe (31); a hydraulic adjusting mechanism comprises a first adjusting assembly (41) and a second adjusting assembly (42), the first adjusting assembly (41) is movably arranged on one side of the oil storage cylinder (2) along a second direction and is used for adjusting the oil passing amount per unit time in the first oil passing channel (51), and the first adjusting assembly (41) is partially arranged outside the oil storage cylinder (2), the second adjusting assembly (42) is movably arranged in the second oil passing channel (52) and is used for adjusting the oil passing amount per unit time in the second oil passing channel (52), and the first direction and the second direction are both radial directions of the oil storage cylinder (2) and are arranged at an angle. The first adjusting assembly (41) comprises a first adjusting body (411), an operation handle (412) and a first conical head (413), the first end of the oil storage cylinder (2) is provided with a connecting hole (53), one end of the connecting hole (53) is in communication with the first oil passing channel (51), and the other end is in communication with the outside of the oil storage cylinder (2), the first adjusting body (411) is movably arranged in the connecting hole (53) along the extension direction of the connecting hole (53) and is in sealing connection with the hole wall of the connecting hole (53), the operation handle (412) is located outside the oil storage cylinder (2) and is in threaded connection with one end of the first adjusting body (411), and the first conical head (413) is arranged at the other end of the first adjusting body (411) and is located in the communication of the first oil passing channel (51). ​ ​ 2. The nitrogen damper of claim 1, wherein, ​ 3. The nitrogen damper of claim 2, wherein, The first adjusting assembly (41) further comprises an elastic limiting piece (414) arranged on the first adjusting body (411), and a hole wall of the connecting hole (53) is arranged in a stepped manner along a direction close to the first oil passing channel (51), and the elastic limiting piece (414) can be in contact with the hole wall of the connecting hole (53) under the action of the elasticity thereof.

4. The nitrogen damper of claim 3, wherein, The elastic limiting piece (414) comprises an elastic part (4141) and a ball limiting part (4142), one end of the elastic part (4141) is connected with the first adjusting body (411), the other end is in contact with the ball limiting part (4142), the ball limiting part (4142) can be in contact with the hole wall of the connecting hole (53) under the action of the elasticity of the elastic part (4141), and the ball limiting part (4142) is in rolling fit with the hole wall of the connecting hole (53).

5. The nitrogen damper of claim 1, wherein, The buffer piston assembly (32) comprises 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 arranged in a sleeved manner along an axial direction of the connecting pipe (321), and are in sealing fit with an inner wall of the oil storage cylinder (2), the first buffer piston (322) and the second buffer piston (323) are both provided with a first through hole (3221), the connecting pipe (321) is provided with a second through hole (3211) on a pipe wall, the second through hole (3211) is located between the first buffer piston (322) and the second buffer piston (323), an inner cavity of the connecting pipe (321) is in communication with the second chamber (22), and in the first state, the buffer pipe (31) is inserted into the inner cavity of the connecting pipe (321).

6. The nitrogen damper of claim 5, wherein, A first end of the oil storage cylinder (2) is provided with a groove (54) in communication with the first chamber (21), and in the first state, one end of the connecting pipe (321) facing the buffer pipe (31) can be moved into the groove (54).

7. Nitrogen damper according to any of claims 1-6, characterized in that The piston adjusting mechanism (3) further comprises a piston rod (33) and a third adjusting assembly (34), the piston rod (33) is movably arranged through a second end of the oil storage cylinder (2) along an extending direction of the oil storage cylinder (2) and is connected with the buffer piston assembly (32), one end of the buffer piston assembly (32) close to the piston rod (33) is provided with a perforation (35), at least one third oil passing channel can be in communication with the perforation (35), and one end of the third adjusting assembly (34) is movably arranged on the piston rod (33) along an axial direction of the piston rod (33), and the other end is located in the perforation (35) and is used for adjusting an oil passing amount per unit time in the perforation (35).

8. Nitrogen damper according to any of claims 1-6, characterized in that The second adjusting assembly (42) comprises a second adjusting body (421), an adjusting core (422) and a fourth tapered head (423), the second adjusting body (421) is in sealing connection with the inner wall of the second oil passing channel (52), the second adjusting body (421) is provided with a fourth oil passing channel (4211), one end of the fourth oil passing channel (4211) is in communication with the second oil passing channel (52), and the other end is in communication with the inner cavity of the nitrogen cylinder (1), one end of the adjusting core (422) is in threaded connection with the second adjusting body (421), and the other end is connected with the fourth tapered head (423), and the fourth tapered head (423) is located in the fourth oil passing channel (4211).

9. Nitrogen damper according to any of claims 1-6, characterized in that The nitrogen cylinder (1) is provided with a separation piston (11) movable along the extension direction thereof, the separation piston (11) is in sealing cooperation with the inner wall of the nitrogen cylinder (1), and the inner cavity of the nitrogen cylinder (1) is divided into an oil storage cavity (12) and a nitrogen cavity (13), and the oil storage cavity (12) is in communication with the second oil passing channel (52).

10. A damping method for a nitrogen damper, characterized by The nitrogen damper suitable for any one of claims 1-9, comprising the following steps: According to the working condition used by the nitrogen damper, the position of the first adjusting assembly (41) in the first oil passing channel (51) is adjusted, and the position of the second adjusting assembly (42) in the second oil passing channel (52) is adjusted, so as to change the oil passing amount per unit time in the first oil passing channel (51) and the second oil passing channel (52); The buffer piston assembly (32) is driven to move towards the buffer tube (31), the buffer piston assembly (32) extrudes the hydraulic oil in the first chamber (21), a first part of the hydraulic oil in the first chamber (21) flows into the second chamber (22) through the unblocked third oil passing channel, a second part of the hydraulic oil in the first chamber (21) enters the nitrogen cylinder (1) through the second oil passing channel (52), and a third part of the hydraulic oil in the first chamber (21) enters the buffer tube (31) through the first oil passing channel (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 passing channel in communication with the buffer tube (31).

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