Boss-shaped oil gas seal device
The boss-shaped oil-gas sealing device solves the sealing problem of the landing gear buffer under high impact pressure through the design of the boss-shaped sealing ring and support ring, achieving stable oil-gas sealing and improving the performance and safety of the landing gear.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- TAIZHOU UNIV
- Filing Date
- 2025-05-20
- Publication Date
- 2026-04-24
AI Technical Summary
Existing O-ring seals on aircraft landing gear buffers are difficult to seal effectively under high impact pressure, leading to oil leakage and affecting the performance and safety of the landing gear.
The device employs a boss-shaped oil-gas seal, which includes a boss-shaped sealing ring and a support ring design. The main body of the boss-shaped sealing ring is embedded in the rubber ring groove of the support ring, and the protrusion contacts the piston rod. A fixed seal is achieved through large-area contact. The protrusion elastically deforms under high pressure to achieve a movable seal. Combined with a retaining ring, the movement of the sealing ring is restricted, and a wear-resistant ring reduces friction.
Achieving stable oil-gas sealing under high impact pressure prevents leakage, improves landing gear operating efficiency and reliability, reduces frictional loss, and extends component life.
Smart Images
Figure CN224162003U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of aircraft landing gear sealing technology, and in particular to a boss-shaped oil-gas seal device. Background Technology
[0002] Currently, the oil and gas sealing of aircraft landing gear buffers typically relies on O-ring seals. O-rings achieve a seal by creating contact pressure on the sealing surface through their elastic deformation. They can generally withstand a maximum pressure of 25 MPa and are suitable for fixed sealing applications.
[0003] However, during aircraft landing, the landing gear buffers are subjected to tremendous impacts, with impact pressures often exceeding 25 MPa, and sometimes reaching 60 MPa or higher. Under such high pressure, O-ring seals are difficult to use effectively, frequently resulting in pressure drops and oil leaks, which seriously affect the performance and safety of the landing gear. Utility Model Content
[0004] In view of this, this application provides a boss-shaped oil and gas sealing device to solve the problem of oil and gas leakage in landing gear and meet the requirements for oil and gas sealing under impact pressure conditions.
[0005] This application provides a boss-shaped oil-gas seal device, the boss-shaped oil-gas seal device comprising:
[0006] A landing gear body, comprising an outer cylinder, a piston rod, and a support ring, wherein the outer cylinder surrounds the periphery of the piston rod, the support ring is sandwiched between the outer cylinder and the piston rod, the support ring is fixed to the end of the outer cylinder, and a rubber ring groove is provided on the side of the support ring adjacent to the piston rod; and
[0007] A sealing ring assembly is nested in the rubber ring groove of the support ring and contacts the outer surface of the piston rod. The sealing ring assembly includes a boss-shaped sealing ring, which has a main body and a protrusion. The main body is embedded in the rubber ring groove, and the protrusion contacts the outer surface of the piston rod.
[0008] The piston rod is capable of telescopic movement along a first direction, which is the axial direction of the piston rod. The sealing ring assembly further includes a first retaining ring and a second retaining ring, which are arranged along the first direction and are respectively disposed on both sides of the protrusion, and are used to restrict the movement of the boss-shaped sealing ring along the first direction.
[0009] The main body of the boss-shaped sealing ring has a first projected area on the surface of the support ring, and the protrusion has a second projected area on the surface of the support ring, wherein the first projected area is larger than the second projected area.
[0010] The landing gear body also includes a nut and a wear ring. The nut is located at one end of the piston rod adjacent to the outer cylinder, and the wear ring is nested between the nut and the outer cylinder. The nut and the wear ring can move along the first direction with the piston rod.
[0011] The raised portion of the boss-shaped sealing ring has an end face that contacts the piston rod and is an arc-shaped surface; the surface of the main body that contacts the rubber ring groove is provided with anti-slip texture.
[0012] The landing gear body also includes fasteners, which pass through the support ring and the outer cylinder and are used to fix the support ring to the outer cylinder.
[0013] The boss-shaped oil and gas sealing device provided in this embodiment uses a boss-shaped sealing ring. The main body of the boss-shaped sealing ring is embedded in the rubber ring groove of the support ring, which can achieve a stable fixed seal. Under the action of impact pressure, the main body is firmly embedded in the rubber ring groove, and it is not easy to displace or deform, providing a solid fixed foundation for the entire sealing device. The protrusion of the boss-shaped sealing ring can fully fit with the outer surface of the piston rod. When the landing gear body is subjected to impact pressure, the protrusion is more likely to undergo elastic deformation under high pressure, tightly fitting the piston rod surface, achieving a reliable movable seal, effectively coping with higher impact pressure, and meeting the oil and gas sealing requirements of the landing gear under complex operating conditions. Attached Figure Description
[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0015] Figure 1 This is a schematic cross-sectional view of the boss-shaped oil and gas sealing device provided in the embodiments of this application;
[0016] Figure 2 This is a cross-sectional structural diagram of the sealing ring assembly provided in the embodiment of this application in its unfolded state;
[0017] Figure 3 This is a cross-sectional structural schematic diagram of the boss-shaped oil and gas sealing device provided in the comparative embodiment of this application;
[0018] Figure 4 This is a schematic diagram of the structure of the O-ring seal assembly provided in the comparative embodiment of this application.
[0019] Explanation of reference numerals in the attached figures:
[0020] 1-Bossed oil and gas seal device, 2-O-ring seal, 10-Landing gear body, 20-Sealing ring assembly, 30-Nut, 40-Wear ring, 50-Fastener, 11-Outer cylinder, 12-Piston rod, 13-Support ring, 21-Bossed sealing ring, 22-First retaining ring, 23-Second retaining ring, 131-Rubber ring groove, 211-Main body, 212-Protrusion, X-First direction. Detailed Implementation
[0021] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0022] In this document, references to "embodiment" or "implementation" mean that a particular feature, structure, or characteristic described in connection with an embodiment or implementation may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0023] Before introducing the technical solution of this application, let's go over the technical issues in related technologies in detail.
[0024] Please see Figure 3 and Figure 4 Existing landing gear typically uses O-rings 2 to achieve oil-gas sealing of the shock absorbers. The O-ring seal device consists of an O-ring 2 and a retaining ring, and can generally withstand a maximum pressure of 25 MPa, suitable for fixed seals. However, during aircraft landing, the pressure generated by the landing gear shock absorbers is impact pressure, and the maximum pressure often exceeds 25 MPa, reaching 60 MPa or higher. Therefore, the O-ring seals used for the moving seals of the shock absorbers frequently experience pressure drops or oil leakage.
[0025] In view of this, to solve the above problems, this application provides a boss-shaped oil-gas sealing device 1. Please refer to... Figure 1 and Figure 2The boss-shaped oil and gas sealing device 1 includes a landing gear body 10 and a sealing ring assembly 20. The landing gear body 10 includes an outer cylinder 11, a piston rod 12, and a support ring 13. The outer cylinder 11 surrounds the periphery of the piston rod 12. The support ring 13 is sandwiched between the outer cylinder 11 and the piston rod 12 and is fixed to the end of the outer cylinder 11. A rubber ring groove 131 is provided on the side of the support ring 13 adjacent to the piston rod 12. The sealing ring assembly 20 is nested in the rubber ring groove 131 of the support ring 13 and contacts the outer surface of the piston rod 12. The sealing ring assembly 20 includes a boss-shaped sealing ring 21, which has a main body 211 and a protrusion 212. The main body 211 is embedded in the rubber ring groove 131, and the protrusion 212 contacts the outer surface of the piston rod 12.
[0026] Preferably, the main body 211 of the boss-shaped sealing ring 21 has a first projected area on the surface of the support ring 13, and the protrusion 212 has a second projected area on the surface of the support ring 13. The first projected area is larger than the second projected area, meaning the cross-sectional area of the main body 211 is larger than the cross-sectional area of the protrusion 212. In other words, the boss-shaped sealing ring 21 has a large-area end and a small-area end. The large-area end refers to the main body 211, which is embedded in the rubber ring groove 131 of the support ring 13, providing a large contact area and enabling a stable fixed seal. The small-area end refers to the protrusion 212, which, under radial extrusion force, fully contacts the outer surface of the piston rod 12, enabling a movable seal.
[0027] The piston rod 12 is capable of telescopic movement along a first direction X, where the first direction X is the axial direction of the piston rod 12.
[0028] Optionally, the sealing ring assembly 20 further includes a first retaining ring 22 and a second retaining ring 23, which are arranged along the first direction X and respectively disposed on both sides of the protrusion 212, and are used to restrict the movement of the boss-shaped sealing ring 21 along the first direction X. In this embodiment, the arrangement of the first retaining ring 22 and the second retaining ring 23 can prevent the boss-shaped sealing ring 21 from flowing along the first direction X into the gap between the piston rod 12 and the support ring 13, thereby protecting the boss-shaped sealing ring 21 from damage and controlling the friction of the moving parts from being too large.
[0029] Optionally, both the first retaining ring 22 and the second retaining ring 23 are rectangular structures. The material of the first retaining ring 22 and the second retaining ring 23 is polytetrafluoroethylene, and a wear-resistant coating is coated on the surface of the first retaining ring 22 and the second retaining ring 23 that contacts the boss-shaped sealing ring 21. The thickness of the wear-resistant coating is 0.05-0.1mm, so as to reduce the friction between the first retaining ring 22 and the second retaining ring 23 and the boss-shaped sealing ring 21 and extend their service life.
[0030] Specifically, the working principle of the boss-shaped oil-gas sealing device 1 provided in this embodiment is as follows: the outer cylinder 11, the support ring 13, and the sealing ring assembly 20 are fixed, while the piston rod 12 moves axially. The main body 211 of the boss-shaped sealing ring 21 is tightly embedded with the rubber ring groove 131 of the support ring 13 to form a fixed seal. Due to the large contact area, it can withstand high pressure. The protrusion 212 of the boss-shaped sealing ring 21 contacts the outer surface of the piston rod 12. Under the radial extrusion force generated by the axial movement of the piston rod 12, the protrusion 212 and the outer surface of the piston rod 12 are fully fitted to achieve a movable seal. The retaining rings on both sides of the protrusion 212 restrict the axial flow of the boss-shaped sealing ring 21, preventing the boss-shaped sealing ring 21 from flowing and deforming and entering the fitting gap between the support ring 13 and the piston rod 12, causing damage. At the same time, it controls the friction between the piston rod 12 and the support ring 13, so that the boss-shaped oil-gas sealing device 1 can work stably and reliably.
[0031] In summary, the boss-shaped oil-gas sealing device 1 provided in this embodiment uses a boss-shaped sealing ring 21. The main body 211 of the boss-shaped sealing ring 21 is embedded in the rubber ring groove 131 of the support ring 13. The first projected area of the main body 211 on the surface of the support ring 13 is larger than the second projected area of the protrusion 212, that is, the cross-sectional area of the main body 211 is larger. This large-area end design allows the main body 211 to have a large contact area with the rubber ring groove 131, which can achieve a stable fixed seal. Under the action of impact pressure, the main body 211 is firmly embedded in the rubber ring groove 131 and is not easy to displace or deform, providing a solid fixed foundation for the entire sealing device. The protrusion 212 of the boss-shaped sealing ring 21, as a small-area end, can fully fit with the outer surface of the piston rod 12 under the action of radial extrusion force. When the landing gear body 10 is subjected to impact pressure, the protrusion 212, with its smaller cross-sectional area, is more prone to elastic deformation under high pressure, tightly fitting the surface of the piston rod 12 to achieve a reliable movable seal. This effectively copes with higher impact pressure and meets the oil and gas sealing requirements of the landing gear under complex operating conditions. Compared with existing O-ring seals, the oil and gas sealing effect of the protruding oil and gas sealing device 1 is greatly improved. Under impact pressure conditions, it can avoid oil and gas leakage and ensure the normal buffering function of the landing gear. At the same time, the friction index of the protruding oil and gas sealing device 1 is lower, which can improve the overall operating efficiency and reliability of the landing gear body 10, and is more suitable for the complex working environment of aircraft landing gear buffers.
[0032] Please refer to it again. Figure 1 The landing gear body 10 also includes a nut 30 and a wear ring 40. The nut 30 is disposed at one end of the piston rod 12 adjacent to the outer cylinder 11, and the wear ring 40 is nested between the nut 30 and the outer cylinder 11. The nut 30 and the wear ring 40 are capable of moving along the first direction X with the piston rod 12.
[0033] Optionally, the wear-resistant ring 40 is made of high-strength wear-resistant material and is nested between the nut 30 and the outer cylinder 11, replacing the direct contact between metal parts in the traditional structure. During the reciprocating motion of the piston rod 12, the wear-resistant ring 40 acts as an intermediate medium to bear the frictional load between the outer cylinder 11 and the nut 30. Its low coefficient of friction significantly reduces motion resistance and minimizes wear and scratches on the metal surface. Compared to the rapid wear caused by the direct contact between the nut 30 and the outer cylinder 11 in the traditional structure, the introduction of the wear-resistant ring 40 concentrates frictional losses on easily replaceable non-metallic parts, significantly extending the service life of core components such as the outer cylinder 11 and the piston rod 12, and reducing maintenance costs and replacement frequency.
[0034] Please refer to it again. Figure 2The protruding portion 212 of the boss-shaped sealing ring 21 has an end face that contacts the piston rod 12, and the end face is an arc-shaped surface. The surface of the main body portion 211 that contacts the rubber ring groove 131 is provided with anti-slip texture.
[0035] In this embodiment, when the arc-shaped end face of the protrusion 212 contacts the surface of the piston rod 12, a tighter line contact seal is achieved compared to traditional planar contact. Under radial compressive force, the arc-shaped surface can adaptively conform to the microscopic undulations of the piston rod 12 surface through elastic deformation, effectively filling gaps and reducing oil and gas leakage channels. Simultaneously, the arc-shaped structure reduces stress concentration between contact surfaces during the reciprocating motion of the piston rod 12, preventing accelerated local wear and extending the service life of the sealing ring.
[0036] Furthermore, the surface of the main body 211 that contacts the rubber ring groove 131 is provided with anti-slip texture. By increasing the surface roughness, the friction between the boss-shaped sealing ring 21 and the support ring 13 is improved. When the aircraft landing gear is subjected to complex vibration and impact loads, the anti-slip texture can effectively prevent the boss-shaped sealing ring 21 from axial or circumferential displacement within the rubber ring groove 131, ensuring that the sealing ring is always in the correct installation position and maintaining stable sealing performance.
[0037] Please refer to it again. Figure 1 The landing gear body 10 also includes a fastener 50, which passes through the support ring 13 and the outer cylinder 11 and is used to fix the support ring 13 to the outer cylinder 11.
[0038] Optionally, the fastener 50 is a pin, which fixes the support ring 13 to the outer cylinder 11, forming a rigid connection structure. When the aircraft landing gear is subjected to complex loads such as landing impact and taxiing vibration, the fastener 50 can effectively transmit and disperse the force, prevent relative displacement or loosening between the support ring 13 and the outer cylinder 11, and ensure that the boss-shaped oil and gas seal device 1 can always maintain stable performance under high impact pressure.
[0039] In this application, the terms "embodiment" and "implementation" mean that a specific feature, structure, or characteristic described in connection with an embodiment can be included in at least one embodiment of this application. The appearance of these phrases in various locations throughout the specification does not necessarily refer to the same embodiment, nor are they independent or alternative embodiments mutually exclusive with other embodiments. Those skilled in the art will understand, explicitly and implicitly, that the embodiments described in this application can be combined with other embodiments. Furthermore, it should be understood that the features, structures, or characteristics described in the various embodiments of this application can be arbitrarily combined to form another embodiment that does not depart from the spirit and scope of the technical solution of this application, provided there is no contradiction between them.
[0040] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. Although this application has been described in detail with reference to the above preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions to the technical solutions of this application should not depart from the spirit and scope of the technical solutions of this application.
Claims
1. A boss-shaped oil-gas sealing device, characterized in that, The boss-shaped oil-gas seal device includes: A landing gear body, comprising an outer cylinder, a piston rod, and a support ring, wherein the outer cylinder surrounds the periphery of the piston rod, the support ring is sandwiched between the outer cylinder and the piston rod, the support ring is fixed to the end of the outer cylinder, and a rubber ring groove is provided on the side of the support ring adjacent to the piston rod; and A sealing ring assembly is nested in the rubber ring groove of the support ring and contacts the outer surface of the piston rod. The sealing ring assembly includes a boss-shaped sealing ring, which has a main body and a protrusion. The main body is embedded in the rubber ring groove, and the protrusion contacts the outer surface of the piston rod.
2. The boss-shaped oil-gas sealing device as described in claim 1, characterized in that, The piston rod is capable of telescopic movement along a first direction, which is the axial direction of the piston rod. The sealing ring assembly further includes a first retaining ring and a second retaining ring, which are arranged along the first direction and are respectively disposed on both sides of the protrusion, and are used to restrict the movement of the boss-shaped sealing ring along the first direction.
3. The boss-shaped oil-gas sealing device as described in claim 1, characterized in that, The main body of the boss-shaped sealing ring has a first projected area on the surface of the support ring, and the protrusion has a second projected area on the surface of the support ring, wherein the first projected area is larger than the second projected area.
4. The boss-shaped oil-gas sealing device as described in claim 2, characterized in that, The landing gear body also includes a nut and a wear ring. The nut is disposed at one end of the piston rod adjacent to the outer cylinder, and the wear ring is nested between the nut and the outer cylinder. The nut and the wear ring are able to move along the first direction with the piston rod.
5. The boss-shaped oil-gas sealing device as described in claim 1, characterized in that, The raised portion of the boss-shaped sealing ring has an end face that contacts the piston rod, and the end face is an arc-shaped surface; the surface of the main body that contacts the rubber ring groove is provided with anti-slip texture.
6. The boss-shaped oil-gas sealing device as described in claim 1, characterized in that, The landing gear body also includes fasteners, which pass through the support ring and the outer cylinder and are used to fix the support ring to the outer cylinder.