Gas-liquid double-seal air spring shock absorber oil seal

Abstract

The utility model relates to the technical field of air shock absorber oil seals, and discloses a gas-liquid double-seal air spring shock absorber oil seal which comprises a metal framework. The elastic sealing body is connected to the metal framework in a vulcanization manner and is provided with an outer lip for sealing gas in the air bag and an inner lip for sealing oil liquid in the piston cylinder; an outer lip opening and an outer supporting lip opening are sequentially formed in the inner side face of the outer lip in the axial direction. After installation, holding force applied by the outer lip spring acts on the outer supporting lip opening and the outer lip opening, the outer lip is supported in the radial direction through the outer supporting lip opening, the anti-pressure capacity and the anti-deformation capacity of the outer lip are remarkably improved, and excessive deformation of the outer lip under the action of high-pressure gas is effectively prevented. Through the improvement, the oil seal can still keep a stable sealing effect when bearing 1.5 MPa gas pressure, the service life of the shock absorber is remarkably prolonged, and the movement smoothness and riding comfort of the shock absorber are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to air damper oil seal technical field more particularly, relate to a kind of air spring damper oil seal of gas-liquid double seal. BACKGROUND

[0002] As Figure 1 , at present, air spring damper is composed of damper 1 and air bag 2, air bag 2 replaces the helical spring of original damper 1 upper end in traditional helical spring damper, changes the working environment of original helical spring damper oil seal, damper 1 includes piston rod 11 and piston cylinder, oil seal 12 is configured between air bag 2 and piston cylinder, the outer lip of oil seal 12 needs to seal the gas in air bag 2, the inner lip bears the pressure from the oil in lower piston cylinder, so that the alternating gas pressure in air bag 2 directly acts on the outer lip of oil seal 12.

[0003] The oil seal used for current air spring damper is the oil seal of previous helical spring damper, and the structure of the oil seal is shown in the accompanying Figure 2 The oil seal includes elastic sealing body 121, metal framework 122 and inner lip spring 123, the elastic sealing body 121 is wrapped on the metal framework 122, the upper side of the elastic sealing body 121 is the outer lip, the lower side is the inner lip, and the inner lip spring 123 is arranged on the inner lip. When the oil seal is applied to the air spring damper, because the design of the dust lip (i.e. the outer lip) of the conventional oil seal for the helical spring damper is based on the working condition without bearing pressure, the outer lip is thin and long and has no support, and when the air bag 2 is compressed, the high-pressure gas is easy to cause excessive deformation of the outer lip, which increases the contact area between the outer lip and the piston rod 11, increases the contact stress, causes the friction force to surge, accelerates the wear and heating of the lip, causes oil and gas leakage, and the outer lip is only provided with a single lip, and the radial holding force of the outer lip on the piston rod is not enough, so that the air sealing capacity is insufficient. UTILITY MODEL CONTENTS

[0004] The utility model aims at overcoming the defects of the prior art, and provides a kind of air spring damper oil seal of gas-liquid double seal, to solve the technical problems that the outer lip has no support, when air bag is compressed, high-pressure gas is easy to cause excessive deformation of the outer lip, which increases the contact area between the outer lip and the piston rod, increases the contact stress, causes the friction force to surge, accelerates the wear and heating of the lip, causes oil and gas leakage, the outer lip is only provided with a single lip, and the radial holding force of the outer lip on the piston rod is not enough, so that the air sealing capacity is insufficient.

[0005] The utility model takes the technical scheme, a kind of air spring damper oil seal of gas-liquid double seal, comprising: metal framework;Elastomeric sealing body connected to the metal framework, the elastomeric sealing body has the outer lip of sealing gas bag and the inner lip of sealing piston cylinder oil;The inner side surface of the outer lip is sequentially provided with outer lip and outer support lip along the axial direction.

[0006] After installation, the clamping force exerted by the outer lip spring acts on the outer support lip and the outer lip, and the outer support lip radially supports the outer lip, significantly improving the compression resistance and deformation resistance of the outer lip, effectively preventing excessive deformation of the outer lip under the action of high-pressure gas. This support structure reduces the contact area between the outer lip and the piston rod, thereby reducing lip wear and heat generation. At the same time, the cooperation of the outer support lip and the outer lip forms a multi-stage sealing structure, enhancing the stability of the gas seal and avoiding the risk of oil and gas leakage due to deformation. In addition, the outer lip spring ensures that the clamping force is distributed to the outer support lip and the outer lip, further optimizing the sealing performance. Through the above improvements, the oil seal of the utility model can still maintain stable sealing effect when bearing 1.5MPa gas pressure, significantly prolonging the service life of the shock absorber and improving the smoothness of the shock absorber and the ride comfort.

[0007] Further, the inclination angle of the lip edge of the outer support lip near the metal skeleton side is 70°±5°. The inclination angle of the lip edge of the outer support lip near the metal skeleton side is set to 70°±5°, which can effectively improve the pressure gradient of the oil side of the lip and improve the oil sealing performance; significantly improve the sealing stability and deformation resistance in high-pressure environment.

[0008] Further, the inclination angle of the lip edge of the outer support lip away from the metal skeleton side is 15°±5°. The inclination angle of the lip edge of the outer support lip away from the metal skeleton side is set to 15°±5°, forming a gentle gas side lip, increasing the sealing contact area with the piston rod, and improving the gas sealing performance; the inclination angles (70° and 15°) cooperate to form a double effect of sealing oil and gas, prolonging the service life of the oil seal under high pressure.

[0009] Further, the port of the outer lip is provided with a port sealing protruding ring, which is in extrusion fit with the piston rod after installation. The port sealing protruding ring provided on the port of the outer lip is in extrusion fit with the piston rod during installation, forming an additional sealing layer to prevent foreign particles in the air bag from entering the oil seal lip, causing the oil seal to fail.

[0010] Further, the center position of the outer lip spring groove corresponds to the connection position of the outer lip and the outer support lip. The center position of the outer lip spring groove corresponds to the connection position of the outer lip and the outer support lip, so that the clamping force of the outer lip spring is evenly distributed to both, ensuring the sealing pressure balance of the outer lip and the outer support lip, while not affecting the support performance of the outer support lip; this design maintains the overall sealing performance of the outer lip, offsets the gas pressure by spring force, maintains the interference fit between the outer lip and the piston rod, and prevents the contact area from increasing, thereby improving the sealing stability and reducing the risk of deformation.

[0011] Further, the outer lip end face is a flat surface. The flat surface structure avoids the end roll or tear caused by contact stress concentration under the action of high-pressure gas in the traditional inclined end face, preventing gas leakage from the end. This design enhances the structural rigidity of the end under high-pressure working conditions (such as 1.5 MPa), reduces the radial thrust of the gas pressure on the end, thereby indirectly suppressing the excessive deformation of the outer lip root, ensuring the stability of the sealing performance.

[0012] Further, the two lip edges of the outer lip port have the same inclination as the two lip edges of the outer support lip port. The inclination of the lip edges of the outer lip port and the outer support lip port is the same, ensuring the consistency of the sealing performance of the two, avoiding stress concentration or sealing failure caused by inclination difference. This symmetrical design synchronizes the sealing pressure and deformation of the two lip ports, forming a stable gas sealing layer, reducing local stress, prolonging the durability of the lip port, and maintaining the uniformity of the sealing performance.

[0013] Further, the connection between the outer support lip port and the metal skeleton is connected by a circular arc with a radius of 0.5-1 mm. The connection between the support lip port and the metal skeleton is connected by a circular arc with a radius of 0.5-1.0 mm, enhancing the structural strength of the outer support lip port and reducing stress concentration. The circular arc transition avoids stress peaks at sharp corners, improves the support stiffness of the outer lip root, and ensures the sealing stability under high-pressure working conditions (such as 1.5 MPa).

[0014] Further, the inner lip is sequentially provided with an inner lip port and an inner support lip port in the direction of approaching the metal skeleton along the axial direction, and the outer circumferential surface of the inner lip is provided with an inner lip spring groove, and the inner lip spring groove is provided with an inner lip spring. The inner lip is sequentially provided with an inner lip port and an inner support lip port in the direction of approaching the metal skeleton along the axial direction, and the outer circumferential surface is provided with an inner lip spring groove and an inner lip spring, forming a multi-stage sealing structure. The cooperation of the inner support lip port and the inner lip port enhances the oil sealing capacity and prevents sealing failure caused by oil side pressure.

[0015] Further, the relatively gentle lip edges of the outer lip port, the outer support lip port, the inner lip port, and the inner support lip port are provided with annular micro grooves, and the micro grooves cooperate with the outer surface of the piston rod to form a grease storage cavity for storing lubricating grease. The annular micro grooves are provided on the gentle side lip edges of the outer lip port, the outer support lip port, the inner lip port, and the inner support lip port, and cooperate with the piston rod to form a grease storage cavity. Lubricating grease reduces direct friction between the lip port and the piston rod, reduces wear and heat, and prolongs the service life of the seal.

[0016] Further, a ring groove is arranged between the outer support lip and the metal skeleton, and a support ring is assembled in the ring groove, and an inner ring surface of the support ring is a straight edge ring surface. The ring groove is arranged between the outer support lip and the metal skeleton, and the support ring is assembled, and the inner ring surface of the support ring is a straight edge ring surface, and the rigidity of the outer lip root is enhanced through radial support. The structure of the support ring disperses the gas pressure, reduces the deformation of the outer lip elastomer, makes the contact area of the outer lip and the piston rod smaller, and the friction is lower, and the sealing capacity and the service life under high pressure (3MPa) are significantly improved, and the material (such as PTFE or polyurethane) of the support ring further reduces the friction coefficient.

[0017] Further, three surfaces of the ring groove include: an oil liquid side lip edge of the outer support lip; a vertical plane opened on the elastic sealing body; and a gas side wall surface of the metal skeleton; wherein a connection between the oil liquid side lip edge of the outer support lip and the vertical plane of the elastic sealing body is a circular arc or a rounded corner transition; and an outer ring surface shape of the support ring is matched with the ring groove. The three surfaces of the ring groove are connected through the circular arc or the chamfer transition, and the stable assembly of the support ring is ensured. The adaptability of the outer ring surface of the support ring and the ring groove avoids assembly gap, the straight edge ring surface of the inner ring surface is accurately matched with the profile of the piston rod, stress concentration is reduced, and the combination strength of the support ring and the elastic sealing body is enhanced through the transition structure, so that loosening or displacement caused by working condition vibration is prevented.

[0018] Further, a radius of the straight edge ring surface of the support ring is greater than an inner ring surface radius of the elastic sealing body close to the piston rod side of the metal skeleton, and is less than a radius of the outer support lip. Through the design, the support ring directly bears most of the pressure on the gas side, and the metal skeleton indirectly bears most of the pressure on the gas side through force transmission, the pressure on the outer lip from the gas side is greatly reduced, the support rigidity and the sealing performance are ensured, the sealing stability under high pressure working condition is further improved, and the risk of oil and gas leakage is reduced.

[0019] Compared with the prior art, the oil seal of the utility model has the beneficial effects that: after installation, the holding force of the outer lip spring acts on the outer support lip and the outer lip, the outer lip is radially supported through the outer support lip, the pressure resistance and the deformation resistance of the outer lip are significantly improved, and the excessive deformation of the outer lip under the action of high-pressure gas is effectively prevented. The support structure reduces the contact area of the outer lip and the piston rod, thereby reducing the lip wear and heating phenomenon. Meanwhile, the cooperation of the outer support lip and the outer lip forms a multi-stage sealing structure, the stability of the gas sealing is enhanced, and the risk of oil and gas leakage caused by deformation is avoided. In addition, the outer lip spring ensures that the holding force is distributed on the outer support lip and the outer lip, and the sealing performance is further optimized. Through the above improvement, the oil seal of the utility model can still maintain stable sealing effect when bearing 1.5MPa gas pressure, the service life of the shock absorber is significantly prolonged, and the motion smoothness and the ride comfort of the shock absorber are improved. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is a structural schematic view of the existing air damper.

[0021] Figure 2 It is a structural schematic view of the oil seal in the existing air damper.

[0022] Figure 3 It is a sectional view of the oil seal in the embodiment one of the utility model.

[0023] Figure 4 It is a sectional view of the oil seal in the embodiment two of the utility model. Figure 3 It is a partial structural schematic view of the sectional view in the utility model.

[0024] Figure 5 It is a sectional view of the oil seal in the embodiment two of the utility model.

[0025] In the figure: 1, damper; 2, air bag; 11, piston rod; 12, oil seal; 121, elastic sealing body; 121a, outer lip; 121b, outer support lip; 121c, inner support lip; 121d, inner lip; 121e, micro groove; 121f, inner lip spring groove; 121g, outer lip spring groove; 121h, ring groove; 121i, port closure convex ring; 122, metal framework; 123, inner lip spring; 124, outer lip spring; 125, support ring. DETAILED DESCRIPTION

[0026] The drawings of the utility model are only used for example description, and can not be understood as the limitation of the utility model. In order to better illustrate the following embodiments, some components in the drawings can be omitted, enlarged or reduced, and the size of actual product is not represented; for those skilled in the art, it is understandable that some known structures and their description in the drawings can be omitted.

[0027] As shown in Figures 1-2 The utility model relates to air damper in vehicle suspension system, disclose a kind of air spring damper oil seal of gas-liquid double seal, for sealing air damper, with the performance of sealing gas and oil.

[0028] Sealing air damper includes damper 1 and air bag 2, air bag 2 is arranged on damper 1, and oil seal 12 is arranged between the piston cylinder of damper 1 and piston rod 11, oil seal 12 is used for sealing gas in upper air bag, and also simultaneously used for sealing oil in lower piston cylinder.

[0029] Specifically, the oil seal 12 includes a metal skeleton 122 and an elastic sealing body 121; the metal skeleton 122 and the elastic sealing body 121 are connected by vulcanization bonding. Both the metal skeleton 122 and the elastic sealing body 121 are annular structures. The upper part of the elastic sealing body 121 is provided with an outer lip on the side near the airbag 2, and the lower part is provided with an inner lip on the side near the piston cylinder. The outer lip is used to seal the gas in the airbag 2, and the inner lip is used to seal the oil in the piston cylinder.

[0030] Example 1

[0031] like Figures 3-4 As shown, an oil seal for a gas-liquid dual-seal air spring damper includes a metal frame 122 and an elastic sealing body 121. The metal frame 122 and the elastic sealing body 121 are connected by vulcanization bonding, and both the metal frame 122 and the elastic sealing body 121 are annular structures. An outer lip is provided on the gas side (near the air bladder side) of its inner surface, and an inner lip is provided on the inner surface (near the piston cylinder side). The outer lip is used to seal the gas inside the air bladder 2, and the inner lip is used to seal the oil inside the piston cylinder.

[0032] External lip structure:

[0033] The outer lip has at least two lip openings, which are arranged along the oil seal axis towards the metal skeleton. The inner side of the outer lip is provided with a port closing protrusion 121i, an outer lip opening 121a, and an outer support lip opening 121b in sequence. The port closing protrusion 121i is located at the port of the outer lip.

[0034] An annular outer lip spring groove 121g is provided on the outer peripheral surface of the outer lip, and an outer lip spring 124 is provided inside the outer lip spring groove 121g. The distance between the center of the outer lip spring groove 121g and the metal frame 122 is greater than the distance between the outer support lip 121b (specifically the lip line of the outer support lip 121b) and the metal frame 122; preferably, the center position of the outer lip spring groove 121g corresponds to the connection position (at the same height) of the outer lip 121a and the outer support lip 121b. The end face of the outer lip is a straight surface.

[0035] The two lip edges of the outer support lip 121b have inclination angles of 15° ± 5° along the direction closest to the metal skeleton. Figure 3 Angle a) and 70°±5° Figure 3 Angle b), preferably 15° and 70°. The lip inclination angle refers to the angle between the lip slope and the reference axis, which is the axis of the piston rod 11 or the theoretical center line of the oil seal 12 after installation. The two lips of the outer lip 121a and the two lips of the outer support lip 121b have the same inclination. 70°±5° is obtained through the following test:

[0036] Test device: install the oil seal 12 on a test shaft in a sealed cavity, the oil seal 12 seals the sealed cavity, similar to the structure of the air bag 2 and the piston rod 11 (the test equipment does not have excessive requirements, including the test shaft and the sealed cavity, which can simulate the working state of the air bag 2 and the piston rod 11), through the leakage test (test conditions: gas pressure 1.5 MPa, temperature 25±5℃, medium is dry air; recovery speed: 1.8 m / s; compression speed: 0.1 m / s; cycle number: 100 times; and friction test (test speed 1 mm / s, cycle 5 times), it is found that when the oil side outer support lip 121b lip angle is less than 65°, the leakage increases by 20%-30% (from the reference value 0.04 g / 100 cycles to 0.048-0.052 g / 100 cycles); when it is greater than 77°, the friction increases by 10%-15% (from the reference value 4N to 4.4N-4.6N). Within the range of 70°±5°, the leakage is stable at 0.04 g / 100 cycles, the friction is ≤4N, the contact stress distribution is uniform, and the comprehensive performance index (leakage x friction) is lower than that of 65° and 77°. Therefore, 70°±5° is selected as the optimal design interval.

[0037] The outer support lip 121b and the surface of the elastic sealing body 121 attached to the metal skeleton 122 on the side close to the oil seal center are connected by a circular arc (the radius R in the formula) with a radius of 0.5-1.0 mm. When the radius is <0.5 mm, the stress concentration coefficient increases by 2 times, which easily causes the elastic sealing body 121 and the inner circle surface of the metal skeleton 122 to separate, and when the radius is >1 mm, the structural rigidity of the outer support lip 121b is weakened, which causes the compression resistance to decrease. Figure 3

[0038] The outer support lip 121b mainly plays three roles: 1, sealing the gas in the air bag; 2, sealing the oil of the piston; and 3, supporting the outer lip. In order to ensure a larger inclination angle on the oil side, the oil side lip edge of the outer support lip 121b and the flat surface in the middle of the elastic sealing body 121 are treated with a round or arc shape to enhance the structural strength and support performance.

[0039] The elastic sealing body 121 uses nitrile rubber, hydrogenated nitrile rubber or fluororubber, which is a commonly used rubber material for oil seals, with a hardness of about 75±8 Shore A, which is a known technology in the art and will not be described in detail. The elastic sealing body 121 can achieve zero leakage under a pressure of 1.5 MPa using the aforementioned materials, while reducing friction loss. The adhesive strength of the vulcanized elastic sealing body 121 and the metal skeleton 122 needs to be >3 MPa.

[0040] Inner lip structure:

[0041] ​The inner lip is provided with at least two lip openings, and the inner lip is provided with an inner lip opening 121d and an inner support lip opening 121c in sequence along the axial direction of the oil seal towards the metal framework.

[0042] The inclination of the inner lip opening 121d near the piston cylinder side lip is 28°±2°(angle d), preferably 28°. Figure 3 The inclination of the inner lip opening 121d near the air bag side lip is 54°±2°(angle c), preferably 54°. Figure 3 The two lips of the inner support lip opening 121c correspond to the two lips of the inner lip opening 121d and have the same inclination.

[0043] The grease storage cavity:

[0044] The relatively gentle lips of the outer lip opening 121a, the outer support lip opening 121b, the inner lip opening 121d and the inner support lip opening 121c are each provided with a plurality of annular micro grooves 121e for storing lubricating grease. After installation, the micro grooves 121e cooperate with the outer surface of the piston rod 11 to form a grease storage cavity for storing lubricating grease. The lubricating grease can improve the lubricating performance of the contact area, reduce the friction between the outer lip opening 121a, the outer support lip opening 121b, the inner support lip opening 121c, the inner lip opening 121d and the piston rod 11, reduce the wear of the lip opening, and prolong the sealing life of the oil seal. Compared with the design without micro grooves 121e, the friction coefficient is improved and the service life is prolonged.

[0045] After installation, the outer spring 124 can effectively balance the force of the gas in the air bag acting on the inner side of the outer lip in the radial direction outward, and the outer spring 124 can ensure that the interference fit range of the outer lip opening 121a and the piston rod 11 is 0.8-1.2mm, and the interference fit range of the outer support lip opening 121b and the piston rod 11 is 1.0-1.5mm. The present scheme can withstand a pressure of 1.5MPa. When the inner lip opening 121d cannot achieve complete oil sealing, the outer support lip opening 121b can further seal the oil.

[0046] Effect test method of example one:

[0047] Test device: install the oil seal 12 on the test shaft in a sealed cavity, and the oil seal 12 seals the sealed cavity, which is similar to the structure state of the air bag 2 and the piston rod 11 (the test equipment has no excessive requirements, including the test shaft and the sealed cavity, which can simulate the working state of the air bag 2 and the piston rod 11).

[0048] Test shaft: diameter 20mm, surface roughness Ra0.8μm;

[0049] Medium: dry air (dew point ≤-40℃).

[0050] Test conditions:

[0051] Initial pressure: 1.5 MPa (gauge pressure);

[0052] Temperature: 25±5℃;

[0053] Pressure holding time: 72 hours.

[0054] Leakage: The pressure in the sealed cavity was obtained after 72 hours, and the pressure did not decrease (1.5 MPa→1.5 MPa), so the leakage was 0.

[0055] The other test conditions were ensured to be the same, and when the pressure was 1.6 MPa, the pressure decreased by about 0.93 MPa (from 1.6 MPa to 1.507 MPa), indicating that the oil seal in Example 1 could achieve complete sealing when the pressure was below 1.5 MPa.

[0056] Example Two

[0057] As shown in Figure 5 the embodiment differs from Example One in that a ring groove 121h is arranged between the outer support lip 121b and the metal skeleton 122. Three surfaces of the ring groove 121h are respectively the lip edge of the outer support lip 121b on the oil side, the vertical plane arranged on the elastic sealing body 121, and the gas side sidewall surface of the metal skeleton 122. The connection between the lip edge of the outer support lip 121b on the oil side and the vertical plane arranged on the elastic sealing body 121 is rounded or arc-shaped.

[0058] A support ring 125 is assembled in the ring groove 121h. The outer ring surface shape of the support ring 125 is matched with the ring groove 121h, and the inner ring surface is a straight edge ring surface. The inner ring surface radius of the support ring 125 is greater than the straight edge ring surface of the elastic sealing body 121 attached to the metal skeleton 122 near the piston rod 11, and is less than the radius of the outer support lip 121b. After installation, the outer lip 121a and the outer support lip 121b are both in interference fit with the piston rod 11, the inner straight edge ring surface of the support ring 125 is in contact with the piston rod 11, and the straight edge ring surface of the elastic sealing body 121 attached to the metal skeleton 122 near the piston rod 11 is not in contact with the piston rod 11.

[0059] The material of the support ring 125 is PTFE or polyurethane. The low friction coefficient (μ<0.1) of PTFE can reduce the friction loss of the support ring 125 and the piston rod 11, and the high elastic modulus (50 MPa) of polyurethane provides better radial support.

[0060] The root of the outer lip is thinned, and the thickness of the support ring 125 is 0.8-1.5 mm. The support ring 125 has the following effects: 1, sealing the gas in the air bag; 2, sealing the piston oil; 3, supporting the outer lip. This design makes the support of the outer lip better, the pressure bearing capacity stronger, and the rigidity stronger, and the pressure bearing capacity reaches 3 MPa. After the seal is installed, the elastic seal body 121 and the support ring 125 can move relatively, reduce the jamming, and improve the sealing stability.

[0061] By setting the inner lip and the outer lip, the inner lip seals the oil in the shock absorber, and the outer lip seals the high-pressure gas in the air bag. The inner and outer lips are designed with multiple lips (such as outer lip 121a, outer support lip 121b, inner lip 121d, and inner support lip 121c), among which the support lips (such as outer support lip 121b and inner support lip 121c) reduce the pressure on the rubber elastic body, improve the anti-deformation ability, the outer lip spring 124 provides radial pre-tightening force, and ensures the stability of the sealing performance. The introduction of the support ring 125 further improves the pressure bearing capacity to 3 MPa, reduces the contact area, and enhances the sealing reliability. There is no solution in the prior art that simultaneously solves the high-pressure deformation problem of single-seal oil seal through multiple lips, spring pre-tightening force, and rigid support ring 125. The traditional double-seal design cannot be applied to compact spaces, and the present application realizes gas-liquid double-sealing in a single oil seal by strengthening the root of the outer support lip 121b.

[0062] Example two effect test method:

[0063] On the basis of keeping other test conditions of example 1 unchanged, the oil seal 12 is replaced with an oil seal with a support ring 125 (material: PTFE, thickness 1 mm), and the pressure is adjusted to 3.0 MPa (gauge pressure);

[0064] Leakage: After 72 hours, the gas pressure in the sealed cavity is obtained, and the pressure does not decrease (3 MPa→3 MPa), the leakage is 0; disassembly inspection: the support ring 125 is intact.

[0065] Ensure that other test conditions are the same, when tested at 3.2 MPa, the pressure does not decrease (3.2 MPa→3.2 MPa), the leakage is 0; disassembly inspection: the support ring 125 is intact.

[0066] It is shown that the oil seal in example two can achieve complete sealing when the pressure is below 3 MPa. Continue to pressurize, and the final minimum burst pressure is increased from 2 MPa in example one to 6 MPa.

[0067] Obviously, the above embodiments of the present application are merely examples for clearly illustrating the technical solutions of the present application, and are not intended to limit the specific implementation manners of the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application claims shall be included in the protection scope of the present application claims.

Claims

1. A gas-liquid dual seal air spring shock absorber oil seal, characterized by, The application relates to a metal skeleton (122) and an elastic sealing body (121) vulcanized to the metal skeleton (122), wherein the elastic sealing body (121) has an outer lip for sealing gas in a gas bag (2) and an inner lip for sealing oil in a piston cylinder. An inner side surface of the outer lip is sequentially provided with an outer lip port (121a) and an outer support lip port (121b) in the axial direction; and an outer peripheral surface of the outer lip is provided with an outer lip spring groove (121g) in which an outer lip spring (124) is arranged. A center position of the outer lip spring groove (121g) corresponds to a connection position of the outer lip port (121a) and the outer support lip port (121b).

2. The air-liquid double-seal air spring shock absorber oil seal of claim 1, wherein: An inclined angle of a lip edge of the outer support lip port (121b) close to one side of the metal skeleton (122) is 70 DEG+ / -5 DEG.

3. The air spring shock absorber oil seal of claim 1, wherein: An inclined angle of a lip edge of the outer support lip port (121b) away from the metal skeleton (122) is 15 DEG+ / -5 DEG.

4. The air spring shock absorber oil seal of claim 3, wherein: Inclination degrees of two lip edges of the outer lip port (121a) and two lip edges of the outer support lip port (121b) are the same.

5. The air spring shock absorber oil seal of claim 4, wherein: A connection position between the outer support lip port (121b) and the metal skeleton (122) is connected through a circular arc with a radius of 0.5-1.0 mm.

6. The air-liquid double-seal air spring shock absorber oil seal of claim 1, wherein: A port of the outer lip is provided with a port sealing convex ring (121i) which is extruded and matched with a piston rod (11) after installation.

7. The air-liquid double-seal air spring shock absorber oil seal of claim 1, wherein: An end surface of the outer lip is a flat surface.

8. The air-liquid double-seal air spring shock absorber oil seal of claim 1, wherein: An inner lip is sequentially provided with an inner lip port (121d) and an inner support lip port (121c) in the axial direction close to the metal skeleton (122); and an outer peripheral surface of the inner lip is provided with an inner lip spring groove (121f) in which an inner lip spring (123) is arranged.

9. The air spring shock absorber oil seal of claim 1, wherein: Ring-shaped micro grooves (121e) are arranged on relatively gentle lip edges of the outer lip port (121a), the outer support lip port (121b), the inner lip port (121d) and the inner support lip port (121c), the micro grooves (121e) are matched with an outer surface of the piston rod (11) to form a grease storage cavity for storing lubricating grease.

10. The air spring shock absorber oil seal of claim 9, wherein: A ring groove (121h) is arranged between the outer support lip port (121b) and the metal skeleton (122), a support ring (125) is assembled in the ring groove (121h), and an inner ring surface of the support ring (125) is a straight edge ring surface.

11. The gas-liquid double-seal air spring shock absorber oil seal of any one of claims 1-10, wherein: Three surfaces of the ring groove (121h) include:

12. The air-liquid double-seal air spring shock absorber oil seal of claim 11, wherein: An oil side lip edge of the outer support lip port (121b); A vertical plane arranged on the elastic sealing body (121); A gas side wall surface of the metal skeleton (122); A connection position between the oil side lip edge of the outer support lip port (121b) and the vertical plane of the elastic sealing body (121) is a circular arc or a rounded corner transition; and an outer ring surface shape of the support ring (125) is matched with the ring groove (121h). A radius of the straight edge ring surface of the support ring (125) is greater than an inner ring surface radius of the elastic sealing body (121) close to the piston rod (11) side of the metal skeleton (122) and smaller than a radius of the outer support lip port (121b).

13. The air-liquid double-seal air spring shock absorber oil seal of claim 12, wherein: ​

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