Lip seal and damper

Abstract

This utility model relates to the field of sealing technology, and particularly to a lip seal ring and a damper. The lip seal ring of this utility model includes a body, the inner ring of which has a first inner lip and a second inner lip, and an oil seal area is formed between the first inner lip and the second inner lip. Hydraulic oil that leaks from the first inner lip and remains on the surface of the rod body is scraped off by the second inner lip and stored in the oil seal area when the rod body moves axially. The lip seal ring of this utility model has a first inner lip and a second inner lip on the inner ring of the body, and an oil seal area is formed between the first inner lip and the second inner lip. When the first inner lip leaks, the leaked damping oil can be blocked and scraped off by the second inner lip and stored in the oil seal area, thereby playing a double sealing role. Furthermore, when the residual damping oil fills the oil seal area to the point that the pressure in the oil seal area is higher than the pressure in the return cavity, the damping oil in the oil seal area will also flow back into the return cavity, thereby achieving a reliable sealing effect and further improving the service life of the seal ring.

Description

Technical Field

[0001] This utility model relates to the field of sealing technology, and in particular to lip seals and dampers. Background Technology

[0002] Lip seals are mainly used in reciprocating dynamic seals. The sealing of a lip seal is achieved by deforming at least one lip under hydraulic pressure and pressing it tightly against the sealing surface. The higher the hydraulic pressure, the tighter the lip is against the sealing surface. After the sealing lip wears, the lip of the lip seal is stretched and deformed by the medium pressure to compensate for the wear. Therefore, lip seals have a certain degree of automatic compensation capability.

[0003] However, during the cycle life test, the temperature at the local interference contact point between the lip seal and the cylinder wall increases, which intensifies wear and leads to oil leakage. In extreme cases, the sealing lip of the lip seal may undergo permanent plastic deformation, causing complete seal failure and failing the test. Utility Model Content

[0004] To achieve the above objectives, this utility model provides a lip seal ring, including a body, the inner ring of which has a first inner lip and a second inner lip, and an oil seal area is formed between the first inner lip and the second inner lip. Hydraulic oil that leaks from the first inner lip and remains on the surface of the rod body is scraped off by the second inner lip and stored in the oil seal area when the rod body moves axially.

[0005] In some possible embodiments, the first inner lip and the second inner lip extend in opposite directions toward the center of the body.

[0006] In some possible embodiments, the first inner lip and the second inner lip have the same tilt angle, and / or the extension length of the first inner lip is greater than the extension length of the second inner lip.

[0007] In some possible embodiments, the thickness of the first inner lip is smaller than the thickness of the second inner lip.

[0008] In some possible embodiments, the cross-section of the first inner lip includes a first sealing section and a first connecting section formed on its inner side, the first sealing section pressing against the side surface of the rod body, and the first connecting section connecting to the free end of the first inner lip.

[0009] In some possible embodiments, the free end of the first inner lip is formed with a first ring portion, the inner diameter of which is smaller than the diameter of the rod.

[0010] In some possible embodiments, the cross-section of the first ring portion includes a first horizontal segment and a first vertical segment connected at one end, the other end of the first horizontal segment is connected to the first connecting segment, and the other end of the first vertical segment is connected to the outer side of the first inner lip in a circular arc transition.

[0011] In some possible embodiments, the cross-section of the second inner lip includes a second connecting segment and a second sealing segment formed on its inner side, the second sealing segment extending obliquely toward the first inner lip to the inner ring connecting the body, and the second connecting segment pressing against the side surface of the rod body.

[0012] In some possible embodiments, the free end of the second inner lip is formed with a second ring portion, the inner diameter of which is adapted to the diameter of the rod.

[0013] In some possible embodiments, the second ring portion includes a second horizontal segment and a second vertical segment connected at one end, and the other end of the second vertical segment is connected to the outer side of the second inner lip in an arc transition.

[0014] In some possible embodiments, the oil seal area is an oil reservoir recessed on the inner side of the body in a direction away from the center of the body, the inner diameter of the body is larger than the rod diameter, and the two ends of the oil reservoir are respectively connected to the first inner lip and the second inner lip.

[0015] In some possible embodiments, the outer ring of the body has a first outer lip and a second outer lip, the first inner lip and the first outer lip are located at the same end of the body and form a pressure ring groove between them, and the second inner lip and the second outer lip are located at another same end of the body and form a mounting ring groove between them.

[0016] In some possible embodiments, the first outer lip and the second outer lip extend in opposite directions toward the center of the body.

[0017] In some possible embodiments, the cross-section of the first outer lip includes a third sealing section and a third connecting section formed on its outer side, the third sealing section pressing against the inner wall of the cylinder body, and the third connecting section extending to the free end of the first outer lip.

[0018] In some possible embodiments, the cross-section of the second outer lip includes a fourth sealing section and a fourth connecting section formed on its outer side, the fourth sealing section pressing against the inner wall of the cylinder body, and the fourth connecting section extending to the free end of the second outer lip.

[0019] In some possible embodiments, the free end of the first outer lip is formed with a third ring portion, the outer diameter of which is adapted to the inner diameter of the cylinder body; the cross section of the third ring portion includes a third horizontal segment and a third vertical segment connected at one end, and the other end of the third vertical segment is connected to the inner surface of the first outer lip by a circular arc transition.

[0020] In some possible embodiments, the free end of the second outer lip is formed with a fourth ring portion, the outer diameter of which is adapted to the inner diameter of the cylinder body; the cross section of the fourth ring portion includes a fourth horizontal segment and a fourth vertical segment connected at one end, and the other end of the fourth vertical segment is connected to the inner surface of the second outer lip by a circular arc transition.

[0021] In some possible embodiments, a pressure ring groove is formed on the body between the first inner lip and the first outer lip, and the damping oil generates normal pressure on the surface of the pressure ring groove.

[0022] This utility model also provides a damper, which includes a cylinder and a rod. As in the above embodiment, a lip seal is disposed in the cylinder. The lip seal divides the inner cavity of the cylinder into a damping oil cavity and an elastic compensation cavity. The rod passes through the inner ring of the lip seal. The first inner lip and the second inner lip are both pressed against the side surface of the rod, and an oil seal area is formed between the first inner lip, the second inner lip, the outer ring of the body and the side surface of the rod.

[0023] In some possible embodiments, the first inner lip is located at one end of the damping oil cavity, and the second inner lip is located at one end of the elastic compensation cavity. The damping oil exerts pressure on the first inner lip to press it against the side surface of the rod body. The elastic compensation cavity is also provided with a positioning ring and an elastic element, and the elastic element is used to force the positioning ring to always press against the second inner lip.

[0024] In some possible embodiments, one end of the positioning ring has a pressing platform, and the end of the pressing platform near the lip seal ring forms a first inclined surface and a second inclined surface. The first inclined surface presses against the outer surface of the second inner lip, and the second inclined surface presses against the inner surface of the second outer lip. The slope of the first inclined surface is equal to the slope of the second inner lip, and the slope of the second inclined surface is equal to the slope of the second outer lip.

[0025] Compared with the prior art, the beneficial effects of this utility model are as follows: The lip seal ring of this utility model has a first inner lip and a second inner lip on the inner ring of the body, and an oil seal area is formed between the first inner lip and the second inner lip. When the first inner lip leaks, the leaked damping oil can be blocked and scraped off by the second inner lip and left in the oil seal area, thereby playing a double sealing role; and when the residual damping oil fills the oil seal area to the point that the pressure in the oil seal area is higher than the pressure in the return cavity, the damping oil in the oil seal area will also flow back into the return cavity, thereby achieving a reliable sealing effect and further improving the service life of the seal ring. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments 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.

[0027] Figure 1 A three-dimensional structural diagram of the lip seal provided in this embodiment of the utility model. Figure 1 ;

[0028] Figure 2 A three-dimensional structural diagram of the lip seal provided in this embodiment of the utility model. Figure 2 ;

[0029] Figure 3 A cross-sectional view of the lip seal ring provided in an embodiment of this utility model;

[0030] Figure 4 Enlarged cross-sectional view of the first inner lip portion provided for an embodiment of this utility model;

[0031] Figure 5 Enlarged cross-sectional view of the second inner lip portion provided in an embodiment of this utility model;

[0032] Figure 6 Enlarged cross-sectional view of the first outer lip portion provided in an embodiment of this utility model;

[0033] Figure 7 Enlarged cross-sectional view of the second outer lip portion provided in an embodiment of this utility model;

[0034] Figure 8 A cross-sectional structural schematic diagram of the damper provided in the embodiment of this utility model;

[0035] Figure 9 for Figure 8 Enlarged diagram of point A in the middle.

[0036] Reference numerals: Cylinder body 1, Damping oil chamber 11, Return chamber 111, Working chamber 112, Elastic compensation chamber 12, Oil seal area 13, Limiting step 14, Rod body 2, Piston 3, Elastic element 4, Lip seal ring 5, Body 50, Inner ring 501, Outer ring 502, First inner lip 51, First sealing section 511, First connecting section 512, First ring portion 513, First horizontal section 5131, First vertical section 5132, Second inner lip 52, Second sealing section 521, Second connecting section 522, Second ring portion 523, Second horizontal section 5231, Second vertical section 5232, First outer lip 53, Third sealing section 531, Third connecting section 532, Third ring 533, Third horizontal section 5331, Third vertical section 5332, Second outer lip 54, Fourth sealing section 541, Fourth connecting section 542, Fourth ring 543, Fourth horizontal section 5431, Fourth vertical section 5432, Pressure ring groove 55, Mounting ring groove 56, Positioning ring 6, Pressing platform 61, First inclined surface 611, Second inclined surface 612. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model. Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this disclosure, unless otherwise stated, "a plurality of" means two or more.

[0038] Reference Figures 1 to 3The lip seal 5 shown includes a body 50, which has an inner ring 501 and an outer ring 502. The inner ring 501 of the body 50 is provided with a first inner lip 51 and a second inner lip 52 spaced apart. The rod 2 passes through the inner ring 501 of the body 50. The first inner lip 51 and the second inner lip 52 both press against the side surface of the rod 2, and an oil seal area 13 is formed between the inner ring 501, the first inner lip 51, the second inner lip 52 and the rod 2. During use, the rod 2 will reciprocate along its axial direction. After repeated reciprocating motion, damping oil is prone to leak from the first inner lip 51 into the oil seal area 13. However, the leaked damping oil will be blocked by the second inner lip 52, thus playing a double sealing role. Specifically, the damping oil leaking into the oil seal area 13 will adhere to the rod 2. When the rod 2 reciprocates, its The first inner lip 51 will move relative to the second inner lip 52, so the second inner lip 52 can scrape off the damping oil adhering to the side surface of the rod body 2 and store it in the oil seal area 13. As the number of reciprocating movements of the rod body 2 increases, the damping oil leaking from the first inner lip 51 will fill the oil seal area 13. Since the damping oil is incompressible and the damping oil in the oil seal area 13 is blocked by the second inner lip 52, when the rod body 2 extends outward, the pressure in the return cavity 111 will be lower than the pressure in the oil seal area 13, thereby forcing the damping oil in the oil seal area 13 to flow back to the return cavity 111 along the contact surface between the first inner lip 51 and the rod body 2, thus forming a reliable sealing state. It can be seen that the structural design of this application can greatly reduce the risk of oil leakage of the rod body 2 at the lip seal ring 5, increase the number of uses of the lip damper, and thus meet the life test requirements.

[0039] In some possible embodiments, refer to Figure 3 As shown, the first inner lip 51 and the second inner lip 52 extend in opposite directions toward the center of the body 50. That is, the first inner lip 51 and the second inner lip 52 extend in opposite directions from the inner ring 501 of the body 50 toward the rod 2 and finally press against the rod 2. When the pressure in the return cavity 111 increases, the pressure of the damping oil on the first inner lip 51 also increases, which makes the contact between the first inner lip 51 and the rod 2 more tight. When the rod 2 extends outward, the second inner lip 52 will scrape off the damping oil adhering to the rod 2 to prevent the damping oil from leaking from the second inner lip 52 and the rod 2 into the elastic compensation cavity 12 of the cylinder 1.

[0040] In some possible embodiments, refer to Figures 3 to 5As shown, the inclination angles of the first inner lip 51 and the second inner lip 52 are equal. The extension length of the first inner lip 51 is greater than that of the second inner lip 52. Furthermore, the thickness of the first inner lip 51 perpendicular to the rod 2 is smaller than that of the second inner lip 52. Therefore, the deformation of the first inner lip 51, i.e., the inner diameter of the first inner lip 51 is smaller than that of the second inner lip 52, means that the deformation of the first inner lip 51 is greater, its preload pressure relative to the rod 2 is also greater, and its deformation compensation margin is also greater. This is because the contact surface between the first inner lip 51 and the rod 2 is the location with the highest risk of leakage. Therefore, the first inner lip 51 with this structure can extend and reduce the risk of oil leakage at this location as much as possible.

[0041] In some possible embodiments, refer to Figure 4 As shown, the cross-section of the first inner lip 51 includes a first sealing section 511 and a first connecting section 512 formed on its inner side. The first sealing section 511 presses against the side surface of the rod body 2, and the first connecting section 512 is connected to the free end of the first inner lip 51. After installation, when the first inner lip 51 is deformed by pressure, the first sealing section 511 will contact the rod body 2 more, thereby enhancing the sealing between the first inner lip 51 and the rod body 2. Meanwhile, the first connecting section 512 deforms and comes into contact with the damping oil. The damping oil exerts normal pressure on the first connecting section 512, further forcing the first inner lip 51 to undergo elastic deformation, thereby ensuring the sealing between the first sealing section 511 and the side surface of the rod body 2. Furthermore, the included angle between the first sealing section 511 and the first connecting section 512 is in the range of 100° to 110°. This design can ensure that after installation, the normal pressure of the damping oil relative to the first connecting section 512 can force the first inner lip 51 to undergo elastic deformation, thereby increasing the sealing contact area between the first sealing section 511 and the rod body 2.

[0042] In some possible embodiments, refer to Figure 4 As shown, a rounded structure is formed between the first sealing section 511 and the first connecting section 512. The radius of the rounded structure is 0.03mm to 0.06mm. The purpose is to ensure the structural strength of the connection between the first sealing section 511 and the first connecting section 512, and to prevent bending at the connection during installation, which would prevent the rear section of the first sealing section 511 from sealingly contacting the rod body 2.

[0043] In some possible embodiments, refer to Figure 4As shown, a first ring portion 513 is formed at the free end of the first inner lip 51. The inner diameter of the first ring portion 513 is smaller than the rod diameter of the rod body 2. After installation, the first ring portion 513 extends into the return cavity 111 due to the deformation of the first inner lip 51. It can guide the damping oil to the outside of the first inner lip 51 to avoid the damping oil from generating a large axial pressure on the first inner lip 51. Furthermore, the cross-section of the first ring portion 513 includes a first horizontal section 5131 and a first vertical section 5132 connected at one end. The other end of the first horizontal section 5131 is connected to the first connecting section 51. 2. Transition connection: The other end of the first vertical section 5132 is connected to the outer side of the first inner lip 51 by a rounded transition. The included angle between the first horizontal section 5131 and the first connecting section 512 is greater than 90°. After installation, the first horizontal section 5131 and the first connecting section 512 form a groove with a gradually increasing opening at the free end of the first inner lip 51. From this point on, the normal pressure of the damping oil on the surface of the first horizontal section 5131 and the first connecting section 512 will force the first inner lip 51 to deform in a direction away from the center of the body 50, so as to increase the contact area between the first sealing section 511 and the rod 2.

[0044] In some possible embodiments, refer to Figure 5 As shown, the cross-section of the second inner lip 52 includes a second sealing section 521 and a second connecting section 522 formed on its inner side. After installation, the second sealing section 521 extends obliquely toward the inner ring 501 of the connecting body 50 in a direction close to the first inner lip 51. The second connecting section 522 presses against the side surface of the rod body 2. That is, from the cross-section, the oil seal area 13 is the area enclosed by the first sealing section 511, the inner ring 501 of the body 50, the second sealing section 521 and the side surface of the rod body 2. Therefore, when the pressure in the oil seal area 13 increases, the greater the pressure of the damping oil in the oil seal area 13 on the second sealing section 521, the greater the sealing contact area between the second connecting section 522 and the rod body 2. In other words, the higher the pressure in the oil seal area 13, the better the sealing performance at the second inner lip 52.

[0045] In some possible embodiments, refer to Figure 5 As shown, the included angle between the second sealing section 521 and the second connecting section 522 is between 100° and 110°. After installation, the second connecting section 522 is in sealed contact with the side surface of the rod body 2. The second sealing section 521 serves as one of the inner walls of the oil seal area 13. The second sealing section 521 extends obliquely from its connection with the second connecting section 522 in a direction away from the center of the body 50. When scraping oil, the second sealing section 521 can serve as an oblique oil guiding / scraping surface to scrape off the damping oil adhering to the side surface of the rod body 2 and store it in the oil seal area 13, preventing the damping oil in the oil seal area 13 from seeping out from the second connecting section 522.

[0046] In some possible embodiments, refer to Figure 5As shown, a rounded structure is formed between the second sealing section 521 and the second connecting section 522. The radius of the rounded structure is 0.03mm to 0.06mm. The purpose is to ensure the structural strength of the connection between the second sealing section 521 and the second connecting section 522, and to prevent bending at the connection during installation, which would prevent the rear section of the second connecting section 522 from making a sealing contact with the rod body 2.

[0047] In some possible embodiments, refer to Figure 5 As shown, the free end of the second inner lip 52 also forms a second ring portion 523, which is adapted to the rod diameter of the rod body 2. Furthermore, the second ring portion 523 includes a second horizontal section 5231 and a second vertical section 5232 connected at one end. The other end of the second horizontal section 5231 is connected to the second connecting section 522, and the other end of the second vertical section 5232 is connected to the outer side of the second inner lip 52 by a rounded transition. During installation, the second horizontal section 5231 is affected by the deformation of the second inner lip 52, which enables it to seal and fit the rod body 2. This design can increase the contact area between the second inner lip 52 and the side surface of the rod body 2, and improve the sealing reliability at this point.

[0048] In some possible embodiments, refer to Figure 8 and Figure 9 As shown, the oil seal area 13 is an oil storage tank recessed on the inner side of the body 50 in a direction away from the center of the body 50. The inner diameter of the body 50 is larger than the rod diameter of the rod 2. The two ends of the oil storage tank are connected to the first inner lip 51 and the second inner lip 52, respectively, so that the oil seal area 13 is formed in the area of ​​the inner ring 501 of the body 50 between the first inner lip 51 and the second inner lip 52. The damping oil leaking from the first inner lip 51 will be stored in the oil seal area 13.

[0049] In some possible embodiments, refer to Figures 1 to 3As shown, the outer ring 502 of the body 50 has a first outer lip 53 and a second outer lip 54. The first inner lip 51 and the first outer lip 53 are located at the end of the body 50 near the return cavity 111, and a pressure ring groove 55 is formed between the first inner lip 51 and the first outer lip 53. The second inner lip 52 and the second outer lip 54 are located at the end of the body 50 away from the return cavity 111, and a mounting ring groove 56 is formed between the second inner lip 52 and the second outer lip 54. The damping oil in the return cavity 111 generates equal normal pressure on each point of the pressure ring groove 55, so that the pressure ring groove 55 is opened, i.e., the first... The inner lip 51 provides a more airtight seal to the rod body 2, while the outer lip 53 provides a more airtight seal to the inner wall of the cylinder body 1. The mounting ring groove 56 is used to install the positioning ring 6. The positioning ring 6 is always pressed against the mounting ring groove 56 to open the mounting ring groove 56. That is, the second inner lip 52 provides a more airtight seal to the rod body 2, while the second outer lip 54 provides a more airtight seal to the inner wall of the cylinder body 1. It can be seen that the first inner lip 51 and the first outer lip 53 of the lip seal ring 5 of this application can serve as the first sealing structure to prevent damping oil leakage, while the second inner lip 52 and the second outer lip 54 serve as the second sealing structure, thereby playing a double sealing protection role.

[0050] In some possible embodiments, refer to Figure 3 As shown, the first outer lip 53 and the second outer lip 54 extend in opposite directions away from the center of the body 50. Specifically, the opening direction of the pressure ring groove 55 faces the pressure direction of the damping oil. Therefore, the greater the pressure of the damping oil in the return cavity 111, the better the sealing effect at the first inner lip 51 and the first outer lip 53. The opening direction of the mounting ring groove 56 is opposite to the opening direction of the pressure ring groove 55, that is, the opening direction of the mounting ring groove 56 is away from the pressure direction of the damping oil. When the rod 2 extends outward, the second inner lip 52 can scrape off the damping oil on the rod 2 and prevent the damping oil from leaking.

[0051] In some possible embodiments, refer to Figure 6As shown, the cross-section of the first outer lip 53 includes a third sealing section 531 and a third connecting section 532 formed on its outer side. The third sealing section 531 presses against the inner wall of the cylinder body 1, and the third connecting section 532 extends to the free end of the first outer lip 53. Further, a third ring portion 533 is formed at the free end of the first outer lip 53. The outer diameter of the third ring portion 533 is adapted to the inner diameter of the cylinder body 1. The cross-section of the third ring portion 533 includes a third horizontal section 5331 and a third vertical section 5332 connected at one end. The third horizontal section 5331... The other end of 331 is connected to the third connecting section 532. The other end of the third vertical section 5332 is connected to the inner side of the first outer lip 53 by a rounded transition. During use, since the third sealing section 531 is sealed to the inner wall of the cylinder 1 and deforms, the normal pressure of the damping oil acting on the third connecting section 532, the third horizontal section 5331 and the third vertical section 5332 can force the first outer lip 53 to deform further in the direction closer to the center of the body 50, so as to increase the contact area between the third sealing section 531 and the inner wall of the cylinder 1.

[0052] In some possible embodiments, refer to Figure 7 As shown, the cross-section of the second outer lip 54 includes a fourth sealing section 541 and a fourth connecting section 542 formed on its outer side. The fourth sealing section 541 presses against the inner wall of the cylinder body 1, and the fourth connecting section 542 extends to the free end of the second outer lip 54. Further, a fourth ring portion 543 is formed at the free end of the second outer lip 54. The outer diameter of the fourth ring portion 543 is adapted to the inner diameter of the cylinder body 1. The cross-section of the fourth ring portion 543 includes a fourth horizontal section 5431 and a fourth vertical section 5432 connected at one end. The other end of the fourth horizontal section 5431 is connected to the fourth connecting section 542, and the other end of the fourth vertical section 5432 is connected to the inner side of the second outer lip 54 by a rounded transition. During installation, the fourth horizontal section 5431 is affected by the deformation of the second outer lip 54, so that it can seal against the inner wall of the cylinder body 1. This design can increase the contact area between the second outer lip 54 and the side surface of the cylinder body 1 and improve the sealing reliability at this point.

[0053] In some possible embodiments, refer to Figure 3 As shown, the extension length of the third sealing section 531 is greater than the extension length of the fourth sealing section 541, that is, the deformation of the third sealing section 531 after installation is greater than the deformation of the fourth sealing section 541. This is because the first outer lip 53 has to withstand the pressure of the damping oil in the return cavity 111, so the sealing performance at the first outer lip 53 is higher than that at the second outer lip 54. Furthermore, the third sealing section 531 and the third connecting section 532 are connected by an arc transition, and the fourth sealing section 541 and the fourth sealing section 541 are connected by an arc transition.

[0054] This utility model also provides a damper, see reference. Figure 8 and Figure 9As shown, the damper includes a cylinder 1 and a rod 2. The lip seal 5 of the above embodiment is installed in the cylinder 1 to divide the inner cavity of the cylinder 1 into a damping oil cavity 11 and an elastic compensation cavity 12. One end of the rod 2 passes through the inner ring of the lip seal 5 and extends into the cylinder 1, while the other end extends to the outside of the cylinder 1. The damping oil cavity 11 is filled with damping oil. A piston 3 is provided at one end of the rod 2 located in the cylinder 1. The piston 3 divides the damping oil cavity 11 into a return cavity 111 and a working cavity 112. The first inner lip 51 and the second inner lip 52 on the inner ring 501 of the body 50 are both pressed against the side surface of the rod 2, and an oil seal area 13 is formed in the area enclosed by the inner ring 501 of the body 50, the first inner lip 51, the second inner lip 52 and the side surface of the rod 2. After the rod 2 moves repeatedly relative to the cylinder 1 along its axial direction, the first inner lip 51 may wear down, leading to a decrease in its sealing effect. Damping oil in the return cavity 111 leaks from between the first inner lip 51 and the side surface of the rod 2 to the oil seal area 13. The damping oil in the oil seal area 13 is then blocked by the second inner lip 52, thus reducing the risk of damping oil leaking into the elastic compensation cavity 12, and consequently reducing the risk of damping oil leaking out of the cylinder 1. Therefore, this design can improve the sealing effect of the lip seal 5 and enhance the sealing performance of the lip seal 5 and... The service life of the damper; as the number of reciprocating motions of the rod 2 increases, the amount of damping oil leaking into the oil seal area 13 gradually increases until it fills the oil seal area 13. Due to the incompressible nature of the damping oil, when the rod 2 retracts, the volume of the return cavity 111 increases and the pressure inside decreases. When the pressure in the return cavity 111 is less than the pressure in the oil seal area 13, the damping oil in the oil seal area 13 will seep back into the return cavity 111 from between the first inner lip 51 and the rod 2, thus forming a reliable sealing state and more effectively ensuring that the damping oil will not leak out of the cylinder body 1.

[0055] In some possible embodiments, refer to Figure 9 As shown, the first inner lip 51 is located at one end of the damping oil cavity 11, or more precisely, at one end of the return cavity 111. The second inner lip 52 is located at one end of the elastic compensation cavity 12. The damping oil in the return cavity 111 exerts pressure on the first inner lip 51 to press it against the side surface of the rod body 2, thereby ensuring the sealing between the first inner lip 51 and the side surface of the rod body 2. The elastic compensation cavity is provided with a positioning ring 6 and an elastic element 4. The elastic element 4 can force the positioning ring 6 to always press against the second inner lip 52, thereby ensuring the sealing between the second inner lip 52 and the side surface of the rod body 2. That is, when the second inner lip 52 and the second outer lip 54 are worn, the pressing force of the positioning ring 6 on the second inner lip 52 and the second outer lip 54 will cause it to generate an automatic compensation effect, ensuring that the second inner lip 52 is always pressed tightly against the rod body 2 and the second outer lip 54 is always pressed tightly against the inner wall of the cylinder body 1.

[0056] In some possible embodiments, refer to Figure 9As shown, one end of the positioning ring 6 has a pressing platform 61. The end of the pressing platform 61 near the lip seal ring 5 forms a first inclined surface 611 and a second inclined surface 612. Under the elastic restoring force of the elastic element 4, the first inclined surface 611 and the second inclined surface 612 always press against the two inner surfaces of the mounting ring groove 56. That is, the first inclined surface 611 always presses against the outer surface of the second inner lip 52, and the second inclined surface 612 always presses against the inner surface of the second outer lip 54. The slope of the first inclined surface 611 is equal to the slope of the second inner lip 52, and the slope of the second inclined surface 612 is equal to the slope of the second outer lip 54, so as to ensure that the pressing platform 61 can be properly pressed into the mounting ring groove 56.

[0057] In some possible embodiments, refer to Figure 9 As shown, the inner diameter of the damping oil cavity 11 is smaller than the inner diameter of the elastic compensation cavity 12. A limiting step 14 will be formed between the damping oil cavity 11 and the elastic compensation cavity 12. During installation, the end face of the first outer lip 53 (i.e., the third vertical section 5332) will abut against the limiting step 14 to ensure that the lip seal 5 is positioned and installed inside the cylinder body 1.

[0058] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. A lip-shaped sealing ring, characterized in that, The device includes a body (50), the inner ring (501) of which has a first inner lip (51) and a second inner lip (52), an oil seal area (13) is formed between the first inner lip (51) and the second inner lip (52), hydraulic oil that leaks from the first inner lip (51) and remains on the surface of the rod (2) is scraped off by the second inner lip (52) and stored in the oil seal area (13) when the rod (2) moves axially, the cross section of the first inner lip (51) includes a first sealing section (511) and a first connecting section (512) formed on its inner side, the first sealing section (511) presses against the side surface of the rod (2), and the first connecting section (512) is connected to the free end of the first inner lip (51).

2. The lip seal ring according to claim 1, characterized in that, The first inner lip (51) and the second inner lip (52) extend in opposite directions toward the center of the body (50).

3. The lip seal ring according to claim 2, characterized in that, The first inner lip (51) and the second inner lip (52) have the same tilt angle, and / or the extension length of the first inner lip (51) is greater than the extension length of the second inner lip (52).

4. The lip seal ring according to claim 1, characterized in that, The thickness of the first inner lip (51) is smaller than that of the second inner lip (52).

5. The lip seal ring according to claim 1, characterized in that, The free end of the first inner lip (51) is formed with a first ring portion (513), the inner diameter of the first ring portion (513) being smaller than the rod diameter of the rod body (2).

6. The lip seal ring according to claim 5, characterized in that, The cross-section of the first ring portion (513) includes a first horizontal segment (5131) and a first vertical segment (5132) connected at one end. The other end of the first horizontal segment (5131) is connected to the first connecting segment (512), and the other end of the first vertical segment (5132) is connected to the outer side of the first inner lip (51) by a circular arc transition.

7. The lip seal ring according to claim 1, characterized in that, The cross section of the second inner lip (52) includes a second sealing section (521) and a second connecting section (522) formed on its inner side. The second sealing section (521) extends obliquely toward the first inner lip (51) to the inner ring (501) connecting the body (50). The second connecting section (522) presses against the side surface of the rod body (2).

8. The lip seal ring according to claim 7, characterized in that, The free end of the second inner lip (52) is formed with a second ring (523), the inner diameter of which is adapted to the diameter of the rod (2).

9. The lip seal ring according to claim 8, characterized in that, The second ring portion (523) includes a second horizontal segment (5231) and a second vertical segment (5232) connected at one end, and the other end of the second vertical segment (5232) is connected to the outer side of the second inner lip (52) by a circular arc transition.

10. The lip seal ring according to claim 1, characterized in that, The oil seal area (13) is an oil storage groove recessed on the inner side of the body (50) in a direction away from the center of the body (50). The inner diameter of the body (50) is larger than the rod diameter of the rod (2), and the two ends of the oil storage groove are respectively connected to the first inner lip (51) and the second inner lip (52).

11. The lip seal ring according to claim 1, characterized in that, The outer ring (502) of the body (50) has a first outer lip (53) and a second outer lip (54), the first inner lip (51) and the first outer lip (53) are located at the same end of the body (50) and a pressure ring groove (55) is formed between them, and the second inner lip (52) and the second outer lip (54) are located at the other same end of the body (50) and a mounting ring groove (56) is formed between them.

12. The lip seal ring according to claim 11, characterized in that, The first outer lip (53) and the second outer lip (54) extend in opposite directions toward the center of the body (50).

13. The lip seal ring according to claim 12, characterized in that, The cross section of the first outer lip (53) includes a third sealing section (531) and a third connecting section (532) formed on its outer side, the third sealing section (531) pressing against the inner wall of the cylinder body (1), and the third connecting section (532) extending to the free end of the first outer lip (53).

14. The lip seal ring according to claim 13, characterized in that, The cross section of the second outer lip (54) includes a fourth sealing section (541) and a fourth connecting section (542) formed on its outer side, the fourth sealing section (541) pressing against the inner wall of the cylinder body (1), and the fourth connecting section (542) extending to the free end of the second outer lip (54).

15. The lip seal ring according to claim 13, characterized in that, The free end of the first outer lip (53) is formed with a third ring (533), the outer diameter of the third ring (533) is adapted to the inner diameter of the cylinder (1); the cross section of the third ring (533) includes a third horizontal segment (5331) and a third vertical segment (5332) connected at one end, and the other end of the third vertical segment (5332) is connected to the inner side of the first outer lip (53) by a circular arc transition.

16. The lip seal ring according to claim 14, characterized in that, The free end of the second outer lip (54) is formed with a fourth ring (543), the outer diameter of the fourth ring (543) is adapted to the inner diameter of the cylinder (1); the cross section of the fourth ring (543) includes a fourth horizontal segment (5431) and a fourth vertical segment (5432) connected at one end, and the other end of the fourth vertical segment (5432) is connected to the inner side of the second outer lip (54) by a circular arc transition.

17. The lip seal ring according to claim 11, characterized in that, A pressure ring groove (55) is formed on the body (50) between the first inner lip (51) and the first outer lip (53), and the damping oil generates normal pressure on the surface of the pressure ring groove (55).

18. A damper, characterized in that, The cylinder (1) includes a cylinder body (1) and a rod body (2). A lip seal (5) as described in any one of claims 1 to 17 is disposed inside the cylinder body (1). The lip seal (5) divides the inner cavity of the cylinder body (1) into a damping oil cavity (11) and an elastic compensation cavity (12). The rod body (2) passes through the inner ring of the lip seal (5). The first inner lip (51) and the second inner lip (52) are both pressed against the side surface of the rod body (2). An oil seal area (13) is formed between the first inner lip (51), the second inner lip (52), the outer ring (502) of the body (50), and the side surface of the rod body (2).

19. The damper according to claim 18, characterized in that, The first inner lip (51) is located at one end of the damping oil cavity (11), and the second inner lip (52) is located at one end of the elastic compensation cavity (12). The damping oil exerts pressure on the first inner lip (51) to press it against the side surface of the rod body (2). The elastic compensation cavity (12) is also provided with a positioning ring (6) and an elastic element (4). The elastic element (4) is used to force the positioning ring (6) to always press against the second inner lip (52).

20. The damper according to claim 19, characterized in that, One end of the positioning ring (6) has a pressing platform (61). The pressing platform (61) near the end of the lip seal (5) forms a first inclined surface (611) and a second inclined surface (612). The first inclined surface (611) presses against the outer side of the second inner lip (52), and the second inclined surface (612) presses against the inner side of the second outer lip (54). The slope of the first inclined surface (611) is equal to the slope of the second inner lip (52), and the slope of the second inclined surface (612) is equal to the slope of the second outer lip (54).

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