A bumper seal

Abstract

The application belongs to the technical field of landing gear design, and particularly relates to a buffer sealing device. The device comprises a supporting ring (6) sleeved between a piston rod (5) and a shell (8) of a landing gear buffer, and a gap (7) is formed between the supporting ring (6) and the piston rod (5); four inner wall ring grooves are arranged on the inner wall of the supporting ring (6) in the axial direction from the front end to the rear end, one non-metallic guide ring (1) is respectively pressed in the first inner wall ring groove and the third inner wall ring groove, a combined sealing ring (2) is pressed in the second inner wall ring groove, and a dustproof ring (3) is pressed in the fourth inner wall ring groove; the outer wall of the supporting ring (6) is sleeved with a static sealing ring (4); the gap (7) has the minimum size between the two non-metallic guide rings (1) and has the maximum size at the rear end. The application solves the piston rod wear problem of the buffer with large deformation and large lateral load, and reduces the machining precision requirement of the piston rod surface.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of landing gear design, and particularly relates to a buffer sealing device. BACKGROUND

[0002] The function of the landing gear buffer sealing device is to seal the oil-gas mixed pressure in the buffer. A common sealing device is composed of an O-shaped sealing ring and a dust ring. With the development of sealing ring technology, T-shaped sealing rings and partial combination sealing rings have been used in China at present. The gap fit tolerance between the metal support ring and the piston rod is generally f7 / H8, which belongs to small gap fit. These sealing devices well solve the sealing problem of the buffer, but the contact wear problem between the piston rod and the metal support is not solved. Especially for large aircraft landing gears, when the heading load and the lateral load are large, the piston rod and the support are in contact and friction, and the piston rod surface will be worn to different degrees. SUMMARY

[0003] In order to solve the above problems, the application provides a buffer sealing device, which comprises a support ring arranged between a piston rod and a shell of a landing gear buffer, a gap is formed between the support ring and the piston rod, and the support ring comprises a front end A and a rear end B in the axial direction.

[0004] An inner wall of the support ring is provided with four inner wall ring grooves in the axial direction from the front end A to the rear end B. One non-metallic guide ring is respectively pressed and connected in the first inner wall ring groove and the third inner wall ring groove. A combination sealing ring is pressed and connected in the second inner wall ring groove. A dust ring is pressed and connected in the fourth inner wall ring groove.

[0005] An outer wall of the support ring is provided with an outer wall ring groove, and a static sealing ring is pressed and connected in the outer wall ring groove.

[0006] The gap has the minimum size between the two non-metallic guide rings, has the maximum size at the rear end, and has the size between the minimum size and the maximum size at the front end.

[0007] Preferably, the combination sealing ring comprises at least one hard stop ring and one rubber ring.

[0008] Preferably, the hard stop ring comprises a fluoroplastic sealing ring or a polyether ether ketone sealing ring.

[0009] Preferably, an oil film is arranged between the hard stop ring and the piston rod.

[0010] Preferably, an oil film is arranged in the gap between the dust ring and the combination sealing ring.

[0011] Preferably, the outer wall ring groove is arranged between the front end in the axial direction of the support ring and the first inner wall ring groove.

[0012] Preferably, the minimum size of the gap at the two non-metallic guide rings is set to 0.1mm-0.2mm.

[0013] Preferably, the minimum size of the gap at the two non-metallic guide rings is set to 0.15mm.

[0014] Preferably, the maximum size of the gap at the rear end is set to 0.2mm-1mm.

[0015] Preferably, the maximum size of the gap at the rear end is set to 0.5mm.

[0016] Preferably, the maximum size of the gap at the rear end is set to 0.8mm.

[0017] Preferably, the size of the gap at the front end is set to 0.1mm-0.5mm.

[0018] Preferably, the size of the gap at the front end is set to 0.3mm.

[0019] The application solves the piston rod wear problem of the buffer with large deformation and large lateral load, and reduces the machining precision requirement of the piston rod surface. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 is a structure sectional view of a preferred embodiment of the buffer sealing device of the application.

[0021] Wherein, 1-non-metallic guide ring, 2-combined sealing ring, 3-dustproof ring, 4-static sealing ring, 5-piston rod, 6-support ring, 7-gap, 8-outer shell. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the application clearer, the technical scheme in the embodiments of the application will be described in more detail below in combination with the drawings in the embodiments of the application. In the drawings, the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The described embodiments are part of the embodiments of the application, not all of the embodiments of the application. The embodiments described below by referring to the drawings are exemplary and are intended to explain the application, and cannot be understood as a limitation of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the application. The embodiments of the application will be described in detail below in combination with the drawings.

[0023] The application provides a buffer sealing device, as shown in Figure 1 mainly comprising:

[0024] A support ring 6 is arranged between the piston rod 5 of the landing gear shock absorber and the outer shell 8, and a gap 7 is formed between the support ring 6 and the piston rod 5, and the support ring 6 includes a front end A and a rear end B in the axial direction;

[0025] The inner wall of the support ring 6 is provided with four inner wall ring grooves in the axial direction from the front end A to the rear end B, a non-metallic guide ring 1 is respectively crimped in the first inner wall ring groove and the third inner wall ring groove, a combined sealing ring 2 is crimped in the second inner wall ring groove, and a dustproof ring 3 is crimped in the fourth inner wall ring groove;

[0026] The outer wall of the support ring 6 is provided with an outer wall ring groove in which a static sealing ring 4 is crimped;

[0027] The gap 7 has the minimum size between the two non-metallic guide rings 1, the maximum size at the rear end, and the size at the front end is between the minimum size and the maximum size.

[0028] In the application, the non-metallic guide ring 1 is used as a separator between the piston rod 5 and the support ring 6, the guide ring material has wear resistance and pressure resistance, the guide ring material is selected according to the load of the shock absorber and the size of the guide ring is designed, the pressure thickness deformation size of the guide ring is calculated, and the size is the maximum gap allowed between the piston rod and the support ring. The dynamic sealing ring, i.e. the combined sealing ring 2, is placed between the two non-metallic guide rings 1, the pressure resistance of the two non-metallic guide rings 1 is fully utilized, the sealing gap at the dynamic sealing ring is ensured to be a certain value, and the compression amount of the dynamic sealing ring is designed according to the calculated maximum gap.

[0029] In the application, the non-metallic guide ring 1 bears the lateral load of the shock absorber, the gap between the support ring 6 and the piston rod 5 is enlarged, the deformation of the piston 5 is avoided, the gap between the piston rod 5 and the support ring 6 is divided into three parts, the gap on both sides of the combined sealing ring 2 is small to ensure the compression performance of the sealing ring, the corresponding gap at the front end of the support ring 6 where the static sealing ring 4 is installed is larger, and the corresponding gap at the rear end of the support ring 6 where the dustproof ring 3 is installed is larger. In this way, the contact between the support ring 6 and the piston rod 5 is avoided on the basis of ensuring the sealing performance.

[0030] In some optional embodiments, the combined sealing ring 2 at least includes a hard stop ring and a rubber ring. In this embodiment, the hard stop ring has a certain rigidity and strength to adapt to the large gap at the sealing position.

[0031] In some optional embodiments, the hard stop ring includes a fluoroplastic sealing ring or a polyether ether ketone sealing ring.

[0032] In some optional embodiments, an oil film is arranged between the hard stop ring and the piston rod 5. In this embodiment, the hard stop ring, such as a fluoroplastic sealing ring, leaves a relatively thick oil film during the movement of the shock absorber, thereby ensuring lubrication and sealing performance.

[0033] In some optional embodiments, an oil film is arranged in the gap 7 between the dustproof ring 3 and the combined sealing ring 2. In this embodiment, a larger gap is left between the dustproof ring 3 and the combined sealing ring 2, which can well store the oil film left by the dynamic sealing ring, and play a role in lubricating the piston rod.

[0034] In some optional embodiments, the outer wall ring groove is arranged between the front end in the axial direction of the support ring 6 and the first inner wall ring groove.

[0035] In some optional embodiments, the minimum size of the gap 7 at the two non-metal guide rings 1 is set to 0.1mm-0.2mm, for example, it can be 0.15mm, 0.13mm or 0.17mm, etc.

[0036] In some optional embodiments, the maximum size of the gap 7 at the rear end is set to 0.2mm-1mm. For example, it can be 0.5mm or 0.8mm, etc.

[0037] In some optional embodiments, the size of the gap 7 at the front end is set to 0.1mm-0.5mm. For example, it can be 0.3mm, 0.3mm, etc.

[0038] The application utilizes the ingenious arrangement of the guide ring, dynamic sealing ring and dustproof ring, effectively isolates and buffers the metal contact between the piston rod and the support ring, and avoids the friction between the metals. At the same time, the oil liquid is stored in the gap between the dustproof ring with certain sealing performance and the dynamic sealing, which ensures the lubrication of the surface of the piston rod, solves the piston rod wear problem of the buffer with large deformation and large lateral load. At the same time, the machining precision requirement of the surface of the piston rod is reduced.

[0039] The above is only a specific embodiment of the application, but the protection scope of the application is not limited to this. Any changes or replacements within the technical range disclosed in the application can be easily thought by those skilled in the art, which should be covered in the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A bumper seal apparatus, characterized by, The support ring (6) is arranged between the piston rod (5) and the shell (8) of the landing gear buffer, and a gap (7) is formed between the support ring (6) and the piston rod (5); the support ring (6) comprises a front end A and a rear end B in the axial direction; The inner wall of the support ring (6) is provided with four inner wall ring grooves in the axial direction from the front end A to the rear end B; a non-metallic guide ring (1) is press-fitted in each of the first inner wall ring groove and the third inner wall ring groove; a combined sealing ring (2) is press-fitted in the second inner wall ring groove; and a dustproof ring (3) is press-fitted in the fourth inner wall ring groove; The outer wall of the support ring (6) is provided with an outer wall ring groove in which a static sealing ring (4) is press-fitted; The gap (7) has a minimum size between the two non-metallic guide rings (1), a maximum size at the rear end, and a size between the minimum size and the maximum size at the front end; The minimum size between the two non-metallic guide rings (1) is 0.1-0.2 mm; the maximum size of the gap (7) at the rear end is 0.2-1 mm; and the size of the gap (7) at the front end is 0.1-0.5 mm.

2. The bumper sealing arrangement of claim 1, wherein, The combined sealing ring (2) comprises at least one hard stop ring and one rubber ring.

3. The bumper sealing arrangement of claim 2, wherein, The hard stop ring comprises a fluoroplastic sealing ring or a polyether ether ketone sealing ring.

4. The bumper sealing arrangement of claim 3, wherein, An oil film is arranged between the hard stop ring and the piston rod (5).

5. The bumper sealing arrangement of claim 4, wherein, An oil film is arranged in the gap (7) between the dustproof ring (3) and the combined sealing ring (2).

6. The bumper sealing arrangement of claim 1, wherein, The outer wall ring groove is arranged between the front end and the first inner wall ring groove in the axial direction of the support ring (6).

7. The bumper sealing arrangement of claim 1, wherein, The minimum size of the gap (7) between the two non-metallic guide rings (1) is 0.15 mm.

8. The bumper sealing arrangement of claim 1, wherein, The maximum size of the gap (7) at the rear end is 0.5 mm.

9. The bumper sealing device of claim 1, wherein, The maximum size of the gap (7) at the rear end is 0.8 mm.

10. The bumper sealing device of claim 1, wherein, The size of the gap (7) at the front end is 0.3 mm.

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