Air spring oil seal with annular framework on outer lip and air spring shock absorber

Abstract

The utility model relates to the technical field of air spring shock absorber oil seals, and discloses an air spring oil seal with an annular framework on an outer lip, which comprises a metal framework and an elastic sealing body vulcanized and adhered on the metal framework, an outer lip and an inner lip are arranged on the elastic sealing body, the outer lip is used for sealing gas, and the inner lip is used for sealing oil; at least three lips are arranged on the inner side surface of the outer lip; an annular framework is embedded in the outer lip and connected with the elastic sealing body in a vulcanization mode. After installation, the annular framework can counteract air pressure in the air bag, and therefore the problems that the contact area and contact stress of the lip edge of the outer lip and a piston shaft are increased, friction force is increased sharply, lip abrasion and heating are accelerated, and oil and gas leakage occurs due to excessive deformation of the outer lip due to pressure are solved. Meanwhile, no less than three lip openings are formed in the outer lip, so that the sealing performance and durability of the outer lip to air in the air bag can be ensured.

Description

Technical Field

[0001] This utility model relates to the field of air spring oil seal technology, and more specifically, to an air spring oil seal with an outer lip and an annular skeleton. Background Technology

[0002] The air spring damper consists of a damper and a high-pressure airbag. The high-pressure airbag replaces the spring at the top of the damper in the traditional spring damper, changing the working environment of the oil seal in the original spring damper. The damper includes a piston rod and a piston cylinder.

[0003] The structure of the oil seal currently used in air springs is shown in the attached figure. Figure 2 As shown, it includes an elastic seal 121, a metal frame 122, and an inner lip spring 123. The elastic seal 121 is wrapped around the metal frame 122. The upper side of the elastic seal 121 is the outer lip, and the lower side is the inner lip. The inner lip spring 123 is located on the inner lip. When applied to an air damper, because the outer lip is thin, long, and unsupported, the high-pressure gas during airbag compression can easily cause excessive deformation of the outer lip, resulting in an increased contact area with the piston rod, increased contact stress, a surge in friction, accelerated lip wear and heat generation, and oil and gas leakage. In addition, the outer lip only has a single lip opening, which is insufficient for sealing. Utility Model Content

[0004] The present invention aims to overcome at least one of the defects of the prior art and provides an air spring oil seal with an outer lip and an annular skeleton to solve the technical problems of the outer lip being thin and long without support, the outer lip being easily deformed by high pressure gas when the airbag is compressed, and the outer lip having only a single lip opening, resulting in insufficient air sealing capacity.

[0005] The technical solution adopted by this utility model is an air spring oil seal with an outer lip and an annular skeleton, comprising: a metal skeleton and an elastic sealing body vulcanized and bonded to the metal skeleton; the elastic sealing body is provided with an outer lip and an inner lip, the outer lip being used to seal gas and the inner lip being used to seal oil; the inner side of the outer lip is provided with at least three lip openings; the outer lip is embedded with an annular skeleton, and the annular skeleton is vulcanized and connected to the elastic sealing body.

[0006] After installation, the ring-shaped frame can counteract the air pressure in the airbag, thereby avoiding excessive deformation of the outer lip due to pressure, which would increase the contact area and contact stress, causing a surge in friction, accelerating lip wear and heat generation, and leading to oil and gas leakage. At the same time, the outer lip has no fewer than three lip openings to ensure the sealing and durability of the outer lip against the gas inside the airbag.

[0007] Furthermore, the outer lip end face near the gas side forms a straight surface with the annular skeleton end face, and this straight surface is perpendicular to the oil seal axis. This straight surface structure enhances the gas-side pressure bearing capacity and prevents gas pressure impact from causing delamination between the elastomer and the skeleton.

[0008] Furthermore, the outer lip includes an axially distributed outer lip opening, an outer support lip opening, and an outer root support lip opening, with each lip opening connected by a rounded transition to form a wavy sealing surface. The wavy sealing surface optimizes the contact stress distribution, reduces the lip wear rate, and the rounded transition avoids the risk of rubber tearing caused by stress concentration.

[0009] Furthermore, the outer root support lip has three sealing lips, wherein:

[0010] The tilt angle of the gas lip is 50°±2°;

[0011] The center lip of the oil seal gradually widens and slopes towards the metal skeleton, with an inclination angle of 15°±2°.

[0012] The inclination angle of the oil-side lip is 75±2°. The three-dimensional differentiated inclination angle design takes into account the functions of gas sealing, oil barrier, and structural support. The 50° main sealing angle achieves optimal gas barrier efficiency, the 15° support angle provides deformation compensation space, and the 75° lip inclination angle provides multiple advantages for the oil-side lip: on the one hand, this angle significantly increases the height of the sealing barrier, effectively reducing the risk of oil leakage in high-pressure environments such as hydraulic systems by enhancing the barrier capability against high-pressure oil; on the other hand, the steep slope results in a smaller direct contact area between the outer lip and the shaft surface when the outer lip is deformed by gas, thereby reducing the friction per unit area, slowing down the lip wear rate, and extending the service life of the oil seal.

[0013] Furthermore, the outer root support lip and the surface of the elastic sealing body near the center of the oil seal attached to the metal skeleton are connected by an arc transition of R0.5-R1.0mm. The arc transition with a specific radius of curvature eliminates sharp angle stress concentration points, prolongs the fatigue life of the elastomer, and maintains the root structural strength of the outer root support lip.

[0014] Furthermore, the axial height of the outer root support lip is 1 / 7 to 1 / 5 of the overall height of the outer lip. This height ratio control ensures that the outer root support lip has sufficient deformation compensation capability, while avoiding excessive height that could lead to abrupt changes in rigidity and affect the uniformity of sealing contact.

[0015] Furthermore, the inner lip is provided with an inner support lip and an inner lip opening, and an inner lip opening spring groove is also provided on the outer circumferential surface of the inner lip, with an inner lip opening spring installed in the inner lip opening spring groove. This composite sealing structure with double lips and spring pre-tensioning dynamically adapts to oil pressure fluctuations, achieving long-lasting oil sealing.

[0016] An air spring damper includes a damper and an air bladder, the air bladder being disposed on the damper, and an air spring oil seal with an outer lip and an annular skeleton being disposed between the piston cylinder and the piston rod of the damper.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0018] After installation, the ring-shaped frame can counteract the air pressure in the airbag, thereby avoiding excessive deformation of the outer lip due to pressure, which would increase the contact area and contact stress, causing a surge in friction, accelerating lip wear and heat generation, and leading to oil and gas leakage. At the same time, the outer lip has no fewer than three lip openings to ensure the sealing and durability of the outer lip against the gas inside the airbag. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of an existing air damper.

[0020] Figure 2 This is a schematic diagram of the internal oil seal in an existing air damper.

[0021] Figure 3 This is a schematic diagram of the overall structure of this utility model.

[0022] Figure 4 This is a schematic diagram of the inclined structure of the three lips of the outer root support lip of this utility model.

[0023] In the diagram: 1. Damper; 11. Piston rod; 12. Oil seal; 121. Elastic seal; 121a. Outer lip; 121b. Outer support lip; 121c. Inner support lip; 121d. Inner lip; 121e. Outer root support lip; 121f. Inner lip spring groove; 122. Metal frame; 123. Inner lip spring; 124. Annular frame; 2. Airbag. Detailed Implementation

[0024] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0025] like Figure 1 and 2 As shown, this solution relates to an air damper in a vehicle suspension system, including a damper 1 and a high-pressure airbag 2. The airbag 2 is mounted on the damper 1. An oil seal 12 is provided between the piston cylinder and the piston rod 11 of the damper 1. The oil seal 12 is used to seal the gas in the upper airbag and also to seal the oil in the lower piston cylinder.

[0026] 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.

[0027] In this design, the outer lip's outer ring surface is a flat cylindrical surface, and an annular skeleton 124 is embedded within the outer lip. After installation, the annular skeleton 124 can counteract the gas pressure on the gas side (the side closer to the airbag 2 is the gas side, the side closer to the center, i.e., the piston rod 11, is the piston rod side, i.e., the oil seal center side, and the side closer to the piston cylinder is the oil side), thereby preventing excessive deformation of the outer lip from causing an increase in contact area and contact stress, which would lead to a surge in friction, accelerated lip wear and heat generation, and oil and gas leakage. Near the gas side, the outer lip end face and the annular skeleton end face form a flat surface, effectively resisting the gas pressure on the gas side.

[0028] The outer lip is provided with at least three lip openings, such as: outer lip opening 121a, outer support lip opening 121b, and outer root support lip opening 121e. The outer lip opening 121a and outer support lip opening 121b seal the air, and the lower outer root support lip opening 121e can seal both the air and the oil. The three lip openings are connected by an arc, so that the outer lip near the piston rod 11 is generally wavy. This design can not only provide wear resistance, but also improve the sealing ability.

[0029] The outer root support lip 121e has three lips. The inclination angle of the lip near the gas side (i.e., angle a in the figure) is 45° to 55°, preferably 50°. The lip near the piston rod side gradually inclines outward from top to bottom, with an inclination angle of 10° to 20°, preferably 15° (i.e., angle b in the figure). The inclination angle of the lip on the oil side (i.e., angle c in the figure) is 70° to 80°, preferably 75°.

[0030] The axial height (L in the figure) of the outer root support lip 121e is 1.2 to 1.6 mm, accounting for 1 / 7 to 1 / 5 of the overall height of the outer lip. The thickness (T in the figure) of the elastic sealing body 121 inside the annular skeleton 124 is 1.0 to 2.0 mm.

[0031] The connection between the outer root support lip 121e and the elastic sealing body 121 attached to the metal skeleton 122 near the metal skeleton 122 is rounded or arc-shaped.

[0032] The thickness of the elastic seal 121 attached to the metal skeleton 122 near the piston rod 11 (as shown by d in the figure) is 0.3 to 0.8 mm, which can effectively improve the connection strength between the outer lip and the metal skeleton 122.

[0033] The inner lip is provided with at least two openings, such as: inner support lip opening 121c and inner lip opening 121d; the outer circumferential surface of the inner lip is also provided with an inner lip opening spring groove 121f, and an inner lip opening spring 123 is provided in the inner lip opening spring groove 121f.

[0034] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An air spring oil seal with an outer lip and an annular skeleton, characterized in that, include: Metal skeleton (122) and elastic seal (121) vulcanized and bonded to the metal skeleton (122). The elastic sealing body (121) is provided with an outer lip and an inner lip. The outer lip is used to seal gas, and the inner lip is used to seal oil. The inner side of the outer lip is provided with at least three lip openings. The outer lip is embedded with an annular skeleton (124), which is vulcanized to the elastic sealing body (121).

2. The air spring oil seal with an outer lip and annular skeleton according to claim 1, characterized in that: The outer lip end face near the gas side forms a flat surface with the end face of the annular skeleton (124), and the flat surface is perpendicular to the oil seal axis.

3. An air spring oil seal with an outer lip and an annular skeleton according to claim 1, characterized in that: The outer lip is provided with an outer lip opening (121a), an outer support lip opening (121b), and an outer root support lip opening (121e) distributed along the axial direction. The lip openings are connected by a circular arc transition to form a wavy sealing surface.

4. An air spring oil seal with an outer lip and an annular skeleton according to claim 3, characterized in that: The outer root support lip (121e) has three sealing lips, wherein: The tilt angle of the gas lip is 50°±2°; The center lip of the oil seal gradually widens and slopes towards the metal skeleton (122), with an inclination angle of 15°±2°; The inclination angle of the oil-side lip is 75°±2°.

5. An air spring oil seal with an annular skeleton on the outer lip according to claim 3, characterized in that: The outer root support lip (121e) and the elastic seal (121) attached to the metal skeleton (122) near the center of the oil seal are connected by an arc transition of R0.5-R1.0mm.

6. An air spring oil seal with an outer lip and an annular skeleton according to claim 3, characterized in that: The axial height of the outer root support lip (121e) is 1 / 7 to 1 / 5 of the overall height of the outer lip.

7. An air spring oil seal with an annular skeleton on the outer lip according to claim 6, characterized in that: The axial height of the outer root support lip (121e) is 1.2 to 1.6 mm, and the thickness of the elastic seal (121) inside the annular skeleton (124) is 1.0 to 2.0 mm.

8. An air spring oil seal with an annular skeleton on the outer lip according to any one of claims 1-7, characterized in that: The inner lip is provided with an inner support lip opening (121c) and an inner lip opening (121d). The outer circumferential surface of the inner lip is also provided with an inner lip opening spring groove (121f), and an inner lip opening spring (123) is provided in the inner lip opening spring groove (121f).

9. An air spring vibration damper, characterized in that, It includes a damper (1) and an airbag (2), the airbag (2) being disposed on the damper (1), and an air spring oil seal with an outer lip and annular skeleton as described in any one of claims 1-8 being disposed between the piston cylinder and the piston rod (11) of the damper (1).

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