Buffer device for landing leg

Abstract

The invention relates to the technical field of buffering, in particular to a buffering device for landing legs, which comprises a cylinder body, a piston rod, a piston assembly and a floating piston assembly, and the piston rod is mounted in an inner cavity of the cylinder body and is slidably mounted along the length direction of the cylinder body; the piston assembly is installed at the end, located in the cylinder body, of the piston rod through a fastener and slidably connected with the inner cavity wall of the cylinder body. The floating piston assembly is installed in the piston rod, the floating piston assembly is installed in the length direction of the piston rod in a sliding mode, and an inner hole of the piston rod is divided into an air cavity area and an oil cavity area by the floating piston assembly; the piston assembly divides the interior of the cylinder body into a rodless cavity and a piston rod inner cavity. An annular cavity is formed in the end of the piston rod. The piston assembly is provided with a damping hole and a damping valve with a normal through hole at the same time, and a double-oil-path structure is formed. The buffering performance is efficient, stability is high, and the capacity of adapting to complex working conditions is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of buffering, and particularly to a buffering device for landing legs. Background Art

[0002] In fields such as aerospace and special equipment, the landing leg buffering device plays a crucial role in the safety and stability of the equipment during the landing process. An ideal buffering device should have efficient buffering performance, reliable stability, and the ability to adapt to complex working conditions. However, the existing landing leg buffering devices have many defects and are difficult to meet the diverse requirements of actual use. In terms of the buffering structure design, the structures of many existing buffering devices are relatively simple, lacking a reasonable oil passage and damping adjustment mechanism. The single-path oil flow mode results in a single damping force during the buffering process, which cannot be flexibly adjusted according to different impact speeds and working conditions, leading to poor buffering effects. Moreover, there are defects in the design of the piston assembly and the floating piston assembly of some devices, which cannot effectively separate the gas chamber and the oil chamber, making it difficult to achieve oil-gas collaborative buffering and further reducing the performance of the buffering device. Summary of the Invention

[0003] The present invention provides a buffering device for landing legs, which can effectively solve the problems in the background art.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is: A buffering device for landing legs, comprising: a cylinder block, a piston rod, a piston assembly, and a floating piston assembly, The piston rod is installed in the inner cavity of the cylinder block and is slidably installed along the length direction of the cylinder block; The piston assembly is installed at one end of the piston rod inside the cylinder block through a fastener, and the piston assembly is slidably connected to the inner cavity wall of the cylinder block; The floating piston assembly is installed inside the piston rod and is slidably installed along the length direction of the piston rod. The floating piston assembly divides the inner hole of the piston rod into a gas chamber area and an oil chamber area; The piston assembly divides the inner part of the cylinder block into a rodless cavity and the inner cavity of the piston rod, and an annular cavity is provided at the end of the piston rod; The piston assembly is simultaneously provided with a damping hole and a damping valve with a constant through-hole, forming a double-oil passage structure.

[0005] The hydraulic oil in the rodless cavity is divided into two paths for flow: The first path enters the inner cavity of the piston rod through the damping hole of the piston assembly to push the floating piston assembly to compress the gas, and the second path enters the annular cavity through the constant through-hole of the damping valve; The two paths of oil generate hierarchical damping forces, and the aperture of the damping hole is smaller than that of the constant through-hole of the damping valve.

[0006] The oil in the inner cavity of the piston rod flows back to the rodless cavity reversely through the damping hole; The oil in the annular cavity flows into the rodless cavity through the normal through-hole of the damping valve.

[0007] Furthermore, a lower support ear is arranged at the end of the piston rod located outside the cylinder block, and a spherical plain bearing is installed in the inner hole of the lower support ear. The spherical plain bearing is fixed by countersunk head screws and a bearing cover plate. The piston rod and the lower support ear are integrally designed to reduce the overall weight.

[0008] Furthermore, a through-hole communicating with the air cavity of the piston rod is arranged on the lower support ear, and an inflation valve assembly is installed at the through-hole. At the same time, an air passage communicating with the air cavity of the piston rod is also arranged on the lower support ear, and a plug is installed at the air passage opening.

[0009] Furthermore, a guide sleeve assembly is installed at the notch of the cylinder block through a locking part, and the piston rod is slidably connected with the guide sleeve assembly.

[0010] Furthermore, a plurality of sealing grooves are arranged axially in the inner wall of the guide sleeve assembly, and the edges of the sealing grooves are rounded.

[0011] Furthermore, an oil filling plug is installed at the through groove at the tail end of the cylinder block, and a slotted and perforated screw is also installed in the fixing screw hole at the tail end of the cylinder block. A locking wire is connected to the oil filling plug and the slotted and perforated screw. The slotted and perforated screw and the locking wire are used to limit the loosening of the oil filling plug.

[0012] Furthermore, the damping holes of the piston assembly and the normal through-holes of the damping valve adopt an asymmetric layout, so that the damping force characteristics of the compression stroke and the stretching stroke can be independently adjusted.

[0013] Furthermore, during the compression stroke, the normal through-hole of the damping valve is configured as a variable throttle structure, and the opening degree is adjusted through a pre-tightening spring to adapt to different impact loads; During the stretching stroke, the flow area of the damping hole is smaller than the effective flow area during the compression stroke to provide a greater rebound damping force.

[0014] Through the technical solution of the present invention, the following technical effects can be achieved: Through a designed buffer device for a landing leg, the cylinder block, piston rod, piston assembly and floating piston assembly cooperate with each other to build a stable mechanical structure for buffer operation. The floating piston assembly divides the inner hole of the piston rod into an air chamber area and an oil chamber area. Combining the rodless chamber, the inner cavity of the piston rod and the end annular chamber separated by the piston assembly, a reasonable hydraulic oil flow space is constructed. The double hydraulic oil passages formed by the damping holes on the piston assembly and the damping valve with a constant through-hole enable the hydraulic oil in the rodless chamber to flow in a split manner, generating a hierarchical damping force. The aperture of the damping hole is smaller than the constant through-hole of the damping valve, ensuring that during the buffering process, the hydraulic oil in different paths can generate different intensities of damping effects according to the aperture and the impact speed. During the compression process, the hydraulic oil in the rodless chamber pushes the floating piston assembly to compress the gas through the damping hole, increasing the supporting force. At the same time, part of the hydraulic oil enters the annular chamber through the constant through-hole of the damping valve, absorbing the impact kinetic energy in two ways. During the stretching process, the hydraulic oil in the inner cavity of the piston rod and the annular chamber flows back to the rodless chamber along the established path to maintain the stable reset of the device. This double hydraulic oil passage with hierarchical damping design can not only effectively absorb and consume the impact kinetic energy, reduce the impact speed, but also ensure the stable operation of the buffer device under different working conditions, provide stable and reliable buffer protection for the landing leg, meet the diverse needs in actual use, and effectively improve the safety and stability of related equipment during the landing process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments recorded in the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0016] Figure 1 Structural schematic diagram of a buffer device for a landing leg in the present invention; Figure 2 Partial enlarged sectional structural schematic diagram of a buffer device for a landing leg in the present invention; Figure 3 Sectional structural schematic diagram of a buffer device for a landing leg in the present invention; Figure 4 Partial structural schematic diagram of the piston rod of a buffer device for a landing leg in the present invention; Figure 5 Partial structural schematic diagram of the cylinder block of a buffer device for a landing leg in the present invention; Figure 6 Structural schematic diagram of the piston assembly of a buffer device for a landing leg in the present invention; Figure 7 Structural schematic diagram of the guide sleeve assembly of a buffer device for a landing leg in the present invention; Figure 8Schematic structural diagram of the floating piston assembly of a buffer device for a landing leg in the present invention; Reference signs in the drawings: 1, cylinder block; 11, oil filling plug; 12, slotted perforated screw; 13, locking wire; 2, piston rod; 21, lower ear; 22, spherical plain bearing; 23, countersunk head screw; 24, bearing cover plate; 25, inflation valve assembly; 26, plug; 3, piston assembly; 31, damping hole; 32, damping valve; 4, floating piston assembly; 5, rodless cavity; 6, inner cavity of piston rod; 7, annular cavity; 8, fastener; 9, locking part; 10, guide sleeve assembly. Detailed implementation manners

[0017] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0018] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0019] In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0020] The present invention relates to a buffer device for a landing leg, as Figures 1 to 8 shown, including: a cylinder block 1, a piston rod 2, a piston assembly 3 and a floating piston assembly 4, The piston rod 2 is installed in the inner cavity of the cylinder block 1 and is slidably installed along the length direction of the cylinder block 1; The piston rod 2 is made of 30CrMnSiA or similar performance alloy steel, the inner hole roughness is ≤Ra0.4, in the direction of the sealing ring installation, the chamfer is 15° to 30°, the roughness of the chamfer is polished to ≤Ra0.8, and the outer circle roughness is ≤Ra0.2; The material of the cylinder block 1 is processed from 27SiMn. The surface roughness of the inner cavity is ≤ Ra0.4. In the direction where the sealing ring is inserted, a chamfer of 15° - 30° is made, and the roughness of the chamfered part after polishing is ≤ Ra0.8; The material of the piston assembly 3 is processed from 38CrSi or 42CrMo. The roughness of the bottom and side edges of the sealing groove is ≤ Ra1.6, and the edges of the sealing groove are rounded; The material of the floating piston assembly 4 is aluminum alloy 7075, which complies with GB / T3191 - 1998. The roughness of the bottom and side edges of the sealing groove is ≤ Ra1.6, the edges of the sealing groove are rounded, and a fillet is made in the direction where the sealing ring is inserted and polished to Ra0.8; The piston assembly 3 is installed at one end of the piston rod 2 inside the cylinder block 1 through the fastener 8, and the piston assembly 3 is slidably connected to the inner wall of the cavity of the cylinder block 1; The floating piston assembly 4 is installed inside the piston rod 2, and the floating piston assembly 4 is slidably installed along the length direction of the piston rod 2. The floating piston assembly 4 divides the inner hole of the piston rod 2 into an air chamber area and an oil chamber area; The piston assembly 3 divides the inside of the cylinder block 1 into a rodless cavity 5 and a piston rod inner cavity 6, and an annular cavity 7 is provided at the end of the piston rod 2; The piston assembly 3 is provided with a damping hole 31 and a damping valve 32 with a constant through - hole at the same time, forming a double - oil - fluid passage structure: The hydraulic oil in the rodless cavity 5 flows in two paths: The first path enters the piston rod inner cavity 6 through the damping hole 31 of the piston assembly 3 to push the floating piston assembly 4 to compress the gas, and the second path enters the annular cavity 7 through the constant through - hole of the damping valve 32; The two paths of oil fluid generate hierarchical damping forces respectively, and the aperture of the damping hole 31 is smaller than the constant through - hole of the damping valve 32; The oil fluid in the piston rod inner cavity 6 flows back to the rodless cavity 5 through the damping hole 31 in the reverse direction; The oil fluid in the annular cavity 7 flows into the rodless cavity 5 through the constant through - hole of the damping valve 32; The working principle of this device is as follows: The initial state of the oil - gas buffer is the longest state. When external forces act on the upper and lower connection points of the oil - gas buffer, the piston rod 2 of the oil - gas buffer is compressed. The hydraulic oil in the rodless cavity 5 enters the inner cavity of the piston rod 2 through the damping hole 31 on the piston assembly 3, pushing the floating piston assembly 4 to move, thereby compressing the gas and increasing the supporting force. Part of the oil fluid enters the annular cavity 7 through the through - hole of the damping valve 32 on the piston assembly 3. When the hydraulic oil passes through the damping hole 31, a damping force is generated, converting the kinetic energy acting on the hydraulic oil into heat energy and transferring it to the atmosphere through the outer wall of the cylinder block 1, so that the kinetic energy gradually decays and the moving speed gradually becomes smaller. The magnitude of the damping force depends on the size of the damping hole and the impact speed; During compression, part of the hydraulic oil in the rodless chamber 5 flows into the inner cavity of the piston rod 2 through the damping hole 31 on the end face of the piston assembly 3, and the other part of the hydraulic oil flows into the annular chamber 7 through the through-hole on the damping valve 32 of the piston assembly.

[0021] During stretching, the hydraulic oil in the inner cavity of the piston rod 2 flows into the rodless chamber 5 through the damping hole 31 on the end face of the piston assembly 3, and the hydraulic oil in the annular chamber 7 flows into the rodless chamber 5 through the through-hole on the damping valve 32; The cylinder block 1, the piston rod 2, the piston assembly 3 and the floating piston assembly 4 cooperate with each other to build a stable mechanical structure for the buffering operation. The floating piston assembly 4 divides the inner hole of the piston rod 2 into an air chamber area and an oil chamber area. Combining the rodless chamber 5, the inner cavity of the piston rod 2 and the end annular chamber 7 separated by the piston assembly 3, a reasonable hydraulic oil flow space is constructed. The double hydraulic oil path formed by the damping hole 31 on the piston assembly 3 and the damping valve 32 with a through-hole enables the hydraulic oil in the rodless chamber 5 to flow in a split manner, generating a graded damping force. The aperture of the damping hole 31 is smaller than the through-hole of the damping valve 32, ensuring that during the buffering process, the hydraulic oil in different paths can generate different intensities of damping effects according to the aperture and the impact speed. During the compression process, the hydraulic oil in the rodless chamber 5 pushes the floating piston assembly 3 to compress the gas through the damping hole 31, increasing the supporting force. At the same time, part of the hydraulic oil enters the annular chamber 7 through the through-hole of the damping valve 32, absorbing the impact kinetic energy in two ways. During the stretching process, the hydraulic oil in the inner cavity of the piston rod 2 and the annular chamber 7 flows back to the rodless chamber 5 along the established path to maintain the stable reset of the device. This double hydraulic oil path combined with the graded damping design can not only effectively absorb and consume the impact kinetic energy, reduce the impact speed, but also ensure the stable operation of the buffer device under different working conditions, provide stable and reliable buffer protection for the landing leg, meet the diverse needs in actual use, and effectively improve the safety and stability of related equipment during the landing process.

[0022] As a preferred solution, as Figures 1 to 4 shown, a lower ear 21 is provided at the end of the piston rod 2 located outside the cylinder block 1, and a spherical plain bearing 22 is installed in the inner hole of the lower ear 21. The spherical plain bearing 22 is fixed by countersunk head screws 23 and a bearing cover plate 24. The piston rod 2 and the lower ear 21 are integrally designed to reduce the overall weight; A through-hole communicating with the air chamber of the piston rod 2 is provided on the lower ear 21, and an inflation valve assembly 25 is installed at the through-hole. At the same time, an air passage communicating with the air chamber of the piston rod 2 is also provided on the lower ear 21, and a plug 26 is installed at the air passage port; The piston rod 2 and the lower support ear 21 are integrally designed, effectively reducing the overall weight and the equipment load. A spherical plain bearing 22 is installed in the inner hole of the lower support ear 21 and fixed by a countersunk head screw 23 and a bearing cover plate 24. This not only ensures the stable installation of the spherical plain bearing 22 but also enables flexible rotation at multiple angles, allowing the buffer device to better adapt to complex landing environments, accurately dock with connecting components, and reduce the risk of buffer failure caused by installation angle deviation. A through hole communicating with the piston rod air chamber is provided on the lower support ear 21, and an inflation valve assembly 25 is installed, facilitating the staff to inflate the air chamber, accurately adjust the gas pressure in the air chamber, and meet the buffer requirements under different working conditions. In addition, the design of the air passage and the plug 26 on the lower support ear 21 that communicates with the air chamber provides a convenient channel for air chamber pressure adjustment and maintenance. During equipment maintenance, the air chamber status can be checked through the air passage, and gas can be discharged or supplemented when necessary. The plug 26 ensures the airtightness of the air chamber and maintains the stable operation of the device, comprehensively improving the performance and maintainability of the buffer device.

[0023] As a preferred solution, as Figures 2 to 5 shown, a guide sleeve assembly 10 is installed at the notch of the cylinder block 1 through a locking member 9, and the piston rod 2 is slidably connected to the guide sleeve assembly 10; The guide sleeve is made of 38CrSi or 42CrMo and processed, the roughness of the bottom and side edges of the sealing groove is ≤ Ra1.6, and the edges of the sealing groove are rounded; A plurality of sealing grooves are axially arranged in the inner wall of the guide sleeve assembly 10, and the edges of the sealing grooves are rounded; Installing the guide sleeve assembly 10 at the notch of the cylinder block 1 through the locking member 9 not only ensures firm installation but also provides accurate sliding guidance for the piston rod 2, effectively preventing the piston rod 2 from shaking and offsetting during reciprocating motion, ensuring the stable operation of the buffer device, and extending the service life of the piston rod 2 and the cylinder block 1. A plurality of sealing grooves are axially arranged in the inner wall of the guide sleeve assembly 10, increasing the sealing area. Combined with the design of the rounded edges of the sealing grooves, the sealing performance is further optimized, effectively preventing hydraulic oil leakage, ensuring the oil flow in the device along the established path, maintaining the internal pressure stability of the buffer device, and ensuring the consistency and reliability of the buffer effect.

[0024] As a preferred solution, as Figure 5 shown, an oil filling plug 11 is installed at the through groove at the tail end of the cylinder block 1, and a slotted and perforated screw 12 is also installed in the fixing screw hole at the tail end of the cylinder block 1. A locking wire 13 is connected to the oil filling plug 11 and the slotted and perforated screw 12, and the slotted and perforated screw 12 and the locking wire 13 are used to limit the loosening of the oil filling plug 11; The oil filling plug 11 provides a convenient oil filling channel for the cylinder block 1, facilitating the staff to replenish and replace the hydraulic oil in the buffer device, ensuring that the device is always in good working condition. The combination of the slotted and perforated screw 12 and the locking wire 13 plays a dual anti-loosening role for the oil filling plug 11. During the operation of the buffer device, when affected by external forces such as vibration and impact, the locking wire 13 effectively restricts the loosening of the oil filling plug 11 by connecting the oil filling plug 11 and the slotted and perforated screw 12, avoiding hydraulic oil leakage caused by the loosening of the plug, maintaining the internal pressure stability of the buffer device, and ensuring the stability of the buffer effect.

[0025] As a preferred solution, as Figures 2 to 6 shown, the damping holes 31 of the piston assembly 3 and the normal through holes of the damping valve 32 adopt an asymmetric layout, enabling independent adjustment of the damping force characteristics in the compression stroke and the tensile stroke; During the compression stroke, the normal through hole of the damping valve 32 is configured as a variable throttle structure, and the opening degree is adjusted by a pre-tightening spring to adapt to different impact loads; During the tensile stroke, the flow area of the damping hole 31 is smaller than the effective flow area during the compression stroke to provide a greater rebound damping force; The asymmetric layout enables independent adjustment of the damping force characteristics in the compression and tensile strokes, greatly enhancing the adaptability of the buffer device to complex landing conditions. During the compression stroke, the damping valve 32 often adopts a variable throttle structure, and the opening degree is adjusted by a pre-tightening spring, which can flexibly adjust the oil flow according to the magnitude of the impact load, ensuring that the buffer device provides just the right buffer force when facing impacts of different intensities, avoiding equipment damage caused by insufficient buffer force or affecting landing stability due to excessive buffer force. During the tensile stroke, by reducing the flow area of the damping hole 31, a greater rebound damping force is provided to smoothly retract the piston rod 2, preventing equipment shaking caused by too fast a rebound and ensuring the safety and stability of the landing process. This design that can flexibly adjust the damping force according to different working conditions fully meets the stringent requirements of the landing leg for the buffer device, not only improving the performance of the buffer device, but also extending its service life, reducing equipment maintenance costs, and providing a strong guarantee for the safe landing of related equipment.

[0026] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification only illustrates the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A buffer device for a landing leg, characterized in that, Comprising: a cylinder block (1), a piston rod (2), a piston assembly (3) and a floating piston assembly (4), the piston rod (2) is installed in the inner cavity of the cylinder block (1) and is slidably installed along the length direction of the cylinder block (1); the piston assembly (3) is installed at one end of the piston rod (2) inside the cylinder block (1) through a fastener (8), and the piston assembly (3) is slidably connected to the inner cavity wall of the cylinder block (1); the floating piston assembly (4) is installed inside the piston rod (2), and the floating piston assembly (4) is slidably installed along the length direction of the piston rod (2), and the floating piston assembly (4) divides the inner hole of the piston rod (2) into an air chamber area and an oil chamber area; the piston assembly (3) divides the inside of the cylinder block (1) into a rodless cavity (5) and a piston rod inner cavity (6), and an annular cavity (7) is provided at the end of the piston rod (2); a damping hole (31) and a damping valve (32) with a constant through-hole are simultaneously provided on the piston assembly (3) to form a double hydraulic fluid passage structure.

2. The buffer device for a landing leg according to claim 1, wherein The hydraulic oil in the rodless cavity (5) flows in two paths: the first path enters the piston rod inner cavity (6) through the damping hole (31) of the piston assembly (3) to push the floating piston assembly (4) to compress the gas, and the second path enters the annular cavity (7) through the constant through-hole of the damping valve (32); the two paths of hydraulic fluid respectively generate stepped damping forces, wherein the aperture of the damping hole (31) is smaller than the constant through-hole of the damping valve (32).

3. The buffer device for landing legs according to claim 1, characterized in that, The hydraulic oil in the piston rod inner cavity (6) flows back to the rodless cavity (5) through the damping hole (31) in the reverse direction; the hydraulic oil in the annular cavity (7) converges into the rodless cavity (5) through the constant through-hole of the damping valve (32).

4. The buffer device for a landing leg according to claim 1, wherein, A lower ear (21) is provided at the end of the piston rod (2) outside the cylinder block (1), and a spherical plain bearing (22) is installed in the inner hole of the lower ear (21), and the spherical plain bearing (22) is fixed by a countersunk head screw (23) and a bearing cover plate (24). The piston rod (2) and the lower ear (21) are integrally designed to reduce the overall weight.

5. The buffer device for a landing leg according to claim 4, characterized in that, A through-hole communicating with the air chamber of the piston rod (2) is provided on the lower ear (21), and an inflation valve assembly (25) is installed at the through-hole. At the same time, an air passage communicating with the air chamber of the piston rod (2) is also provided on the lower ear (21), and a plug (26) is installed at the air passage opening.

6. The buffer device for a landing leg according to claim 1, wherein, A guide sleeve assembly (10) is installed at the notch of the cylinder block (1) through a locking member (9), and the piston rod (2) is slidably connected to the guide sleeve assembly (10).

7. The buffer device for a landing leg according to claim 6, characterized in that, A plurality of sealing grooves are axially provided in the inner wall of the guide sleeve assembly (10), and the edges of the sealing grooves are rounded.

8. The buffer device for a landing leg according to claim 1, characterized in that, An oil filling plug (11) is installed at the through groove at the tail end of the cylinder block (1), and a slotted and perforated screw (12) is also installed in the fixing screw hole at the tail end of the cylinder block (1). A locking wire (13) is connected to the oil filling plug (11) and the slotted and perforated screw (12). The slotted and perforated screw (12) and the locking wire (13) are used to prevent the oil filling plug (11) from loosening.

9. The buffer device for a landing leg according to claim 1, characterized in that, The damping hole (31) of the piston assembly (3) and the constant through-hole of the damping valve (32) adopt an asymmetric layout, so that the damping force characteristics in the compression stroke and the stretching stroke can be independently adjusted.

10. The buffer device for a landing leg according to claim 9, characterized in that, During the compression stroke, the constant through-hole of the damping valve (32) is configured as a variable throttling structure, and the opening degree is adjusted by a pre-tightening spring to adapt to different impact loads; During the stretching stroke, the flow area of the damping hole (31) is smaller than the effective flow area during the compression stroke to provide a greater rebound damping force.

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