Lip-shaped sealing ring and damper

Abstract

The invention relates to the technical field of sealing elements, in particular to a lip-shaped sealing ring and a damper, the lip-shaped sealing ring comprises a body, an inner ring of the body is provided with a first inner lip and a second inner lip, an oil seal area is formed between the first inner lip and the second inner lip, and when the rod moves in the axial direction, hydraulic oil leaking from the first inner lip and remaining on the surface of a rod body is separated from the first inner lip. The oil is scraped by the second inner lip and stored in the oil seal area; according to the lip-shaped sealing ring, the first inner lip and the second inner lip are arranged on the inner ring of the body, the oil seal area is formed between the first inner lip and the second inner lip, and when the first inner lip leaks, leaked damping oil can be blocked by the second inner lip, scraped and reserved in the oil seal area, so that the sealing double-insurance effect is achieved; and when the oil seal area is filled with the residual damping oil until the pressure in the oil seal area is higher than the pressure in the backflow cavity, the damping oil in the oil seal area can flow back into the backflow cavity, so that the reliable sealing effect is achieved, and the service life of the sealing ring is further prolonged.

Description

Technical Field

[0001] The invention relates to the technical field of sealing components, in particular to a lip sealing ring and a damper. Background Art

[0002] Lip seals are mainly used in reciprocating seals. The sealing of lip seals is achieved by deforming at least one lip under the action of liquid pressure and making it close to the sealing surface. The higher the liquid pressure, the tighter the lip is to the sealing surface. After the sealing lip is worn, the lip of the lip seal is stretched and deformed due to the action of the medium pressure to compensate for the wear. Therefore, the lip seal has a certain automatic compensation ability.

[0003] However, during the cycle life test of the lip seal, the temperature of the local interference contact point between the lip seal and the inner wall of the cylinder increases, thereby aggravating the wear and causing oil leakage. In extreme cases, the sealing lip of the lip seal will undergo permanent plastic deformation, causing complete seal failure and failure to pass the test. Summary of the invention

[0004] To achieve the above-mentioned purpose, the present invention provides a lip seal ring, including a main body, the inner ring of the main body having a first inner lip and a second inner lip, an oil seal area is formed between the first inner lip and the second inner lip, and the hydraulic oil leaked from the first inner lip and remaining 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 and tilted toward the center of the body.

[0006] In some possible embodiments, the inclination angles of the first inner lip and the second inner lip are equal, 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, a thickness dimension of the first inner lip is smaller than a thickness dimension of the second inner lip.

[0008] In some possible embodiments, a cross section of the first inner lip includes a first sealing segment and a first connecting segment formed on an inner side thereof, the first sealing segment is crimped to a side surface of the rod body, and the first connecting segment is connected to a free end of the first inner lip.

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

[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 transitionally connected to the outer side surface of the first inner lip in a circular arc.

[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 extends obliquely toward the first inner lip to connect to the inner ring of the body, and the second connecting segment is crimped to the side surface of the rod body.

[0012] In some possible embodiments, a second ring portion is formed at the free end of the second inner lip, and an inner diameter of the second ring portion is matched with a rod diameter of the rod body.

[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 transitionally connected to the outer side surface of the second inner lip in a circular arc.

[0014] In some possible embodiments, the oil sealing area is an oil storage tank that is recessed on the inner side of the body toward a direction away from the center of the body, the inner diameter of the body is larger than the rod diameter of the rod body, and the two ends of the oil storage tank 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 a pressure ring groove is formed therebetween, and the second inner lip and the second outer lip are located at another same end of the body and a mounting ring groove is formed therebetween.

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

[0017] In some possible embodiments, the cross section of the first outer lip includes a third sealing segment and a third connecting segment formed on the outer side thereof, the third sealing segment is crimped against the inner wall of the cylinder body, and the third connecting segment extends 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 segment and a fourth connecting segment formed on the outer side thereof, the fourth sealing segment is crimped against the inner wall of the cylinder body, and the fourth connecting segment extends to the free end of the second outer lip.

[0019] In some possible embodiments, a third ring portion is formed at the free end of the first outer lip, and the outer diameter of the third ring portion 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 transitionally connected to the inner surface of the first outer lip through a circular arc.

[0020] In some possible embodiments, a fourth ring portion is formed at the free end of the second outer lip, and the outer diameter of the fourth ring portion 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 transitionally connected to the inner surface of the second outer lip by a circular arc.

[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 a normal pressure on the surface of the pressure ring groove.

[0022] The present invention also provides a damper, which includes a cylinder body and a rod body. The lip-shaped sealing ring as in the above embodiment is arranged in the cylinder body, and the lip-shaped sealing ring divides the inner cavity of the cylinder body into a damping oil chamber and an elastic compensation chamber. The rod body passes through the inner ring of the lip-shaped sealing ring, and the first inner lip and the second inner lip are both pressed against the side surface of the rod body, and an oil sealing area is formed between the first inner lip, the second inner lip, the outer ring of the main body and the side surface of the rod body.

[0023] In some possible embodiments, the first inner lip is located at one end of the damping oil chamber, and the second inner lip is located at one end of the elastic compensation chamber. The damping oil generates pressure on the first inner lip to press the first inner lip against the side surface of the rod body. A positioning ring and an elastic member are also provided in the elastic compensation chamber. The elastic member 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 crimping platform, and the crimping platform forms a first bevel and a second bevel at one end close to the lip-shaped sealing ring, the first bevel crimps the outer side surface of the second inner lip, and the second bevel crimps the inner side surface of the second outer lip, the slope of the first bevel is equal to the slope of the second inner lip, and the slope of the second bevel is equal to the slope of the second outer lip.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the lip-shaped sealing ring of the present invention is provided with a first inner lip and a second inner lip on the inner ring of the main body and an oil sealing 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 away by the second inner lip and retained in the oil sealing area, thereby playing a double sealing insurance role; and when the residual damping oil fills the oil sealing area until the pressure in the oil sealing area is higher than the pressure in the reflux chamber, the damping oil in the oil sealing area will also flow back to the reflux chamber, thereby achieving a reliable sealing effect and further improving the service life of the sealing ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 Schematic diagram of the three-dimensional structure of the lip seal ring provided in the embodiment of the present invention Figure 1 ; Figure 2 Schematic diagram of the three-dimensional structure of the lip seal ring provided in the embodiment of the present invention Figure 2 ; Figure 3 A cross-sectional structural diagram of a lip seal ring provided in an embodiment of the present invention; Figure 4 An enlarged cross-sectional view of the first inner lip portion provided by an embodiment of the present invention; Figure 5 An enlarged cross-sectional view of the second inner lip portion provided by an embodiment of the present invention; Figure 6 An enlarged cross-sectional view of the first outer lip portion provided by an embodiment of the present invention; Figure 7 An enlarged cross-sectional view of the second outer lip portion provided by an embodiment of the present invention; Figure 8 A schematic diagram of the cross-sectional structure of a damper provided in an embodiment of the present invention; Fig. 9 for Figure 8 A magnified schematic diagram of center A.

[0028] Reference numerals: cylinder 1, damping oil chamber 11, reflux chamber 111, working chamber 112, elastic compensation chamber 12, oil seal area 13, limiting step 14, rod body 2, piston 3, elastic member 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 portion 533, third horizontal section 5331, third vertical section 5332, second outer lip 54, fourth sealing section 541, fourth connecting section 542, fourth ring portion 543, fourth horizontal section 5431, fourth vertical section 5432, pressure ring groove 55, installation ring groove 56, positioning ring 6, crimping table 61, first inclined surface 611, second inclined surface 612. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. In the following, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "multiple" means two or more.

[0030] Reference Figures 1 to 3The lip seal ring 5 shown includes a body 50, the body 50 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 from each other, the rod 2 passes through the inner ring 501 of the body 50, the first inner lip 51 and the second inner lip 52 are both pressed against the side surface of the rod 2, and an oil seal area 13 is formed between the inner ring 501 of the body 50, the first inner lip 51, the second inner lip 52 and the rod 2. When in use, the rod 2 will reciprocate along its axial direction. After multiple reciprocating motions, the damping oil is easy 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, thereby playing a double sealing insurance role. Specifically, the damping oil leaked into the oil seal area 13 will adhere to the rod 2, and 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; and as the number of reciprocating motions of the rod body 2 increases, the damping oil leaked 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 is extended, the pressure in the reflux chamber 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 reflux chamber 111 along the contact surface between the first inner lip 51 and the rod body 2, thereby forming a reliable sealing state. It can be seen that the structural design of the present 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.

[0031] In some possible embodiments, reference Figure 3 As shown, the first inner lip 51 and the second inner lip 52 extend obliquely in opposite directions toward the center of the main body 50, that is, the first inner lip 51 and the second inner lip 52 extend in opposite directions toward the rod body 2 from the inner ring 501 of the main body 50 and finally press the rod body 2. When the pressure in the reflux chamber 111 increases, the pressure of the damping oil on the first inner lip 51 also increases, thereby making the contact and fit between the first inner lip 51 and the rod body 2 closer. When the rod body 2 extends outward, the second inner lip 52 will scrape off the damping oil adhering to the rod body 2 to prevent the damping oil from leaking from between the second inner lip 52 and the rod body 2 into the elastic compensation chamber 12 of the cylinder body 1.

[0032] In some possible embodiments, reference 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 the extension length of the second inner lip 52, and further, the thickness dimension of the first inner lip 51 perpendicular to the rod body 2 is smaller than the thickness dimension of the second inner lip 52. Therefore, the deformation of the first inner lip 51, that is, the inner diameter dimension of the first inner lip 51 is smaller than the inner diameter dimension of the second inner lip 52, that is, the deformation amount of the first inner lip 51 is larger, and its preload pressure relative to the rod body 2 is also greater, and its deformation compensation margin is also larger. This is because the contact surface between the first inner lip 51 and the rod body 2 is the position with the highest leakage risk. Therefore, the first inner lip 51 adopting this structure can extend and reduce the oil leakage risk here as much as possible.

[0033] In some possible embodiments, reference 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 the inner side thereof. The first sealing section 511 is pressed 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. When the first inner lip 51 is compressed and deformed after installation, 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, and the first connecting section 512 is deformed and contacts the damping oil. The damping oil generates a 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; further, the angle between the first sealing section 511 and the first connecting section 512 ranges from 100° to 110°. Such a 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.

[0034] In some possible embodiments, reference Figure 4 As shown, a chamfered structure is formed between the first sealing segment 511 and the first connecting segment 512. The radius of the chamfered structure is 0.03 mm to 0.06 mm. The purpose is to ensure the structural strength of the connection between the first sealing segment 511 and the first connecting segment 512, and to avoid bending of the connection during installation, which causes the rear section of the first sealing segment 511 to be unable to seal with the rod body 2.

[0035] In some possible embodiments, reference Figure 4As shown, a first ring portion 513 is formed at the free end of the first inner lip 51, and 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 is affected by the deformation of the first inner lip 51 and extends into the reflux cavity 111, which can guide the damping oil to the outside of the first inner lip 51 to avoid the damping oil from exerting a large axial pressure on the first inner lip 51; further, 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, and 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 transitionally connected with the outer side surface of the first inner lip 51 by an arc, the angle between the first horizontal section 5131 and the first connecting section 512 is greater than 90°, and after installation, the first horizontal section 5131 and the first connecting section 512 form a notch with a gradually increasing opening at the free end of the first inner lip 51, and the normal pressure of the damping oil on the surfaces 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 body 2.

[0036] In some possible embodiments, reference Figure 5 As shown, the cross section of the second inner lip 52 includes a second sealing segment 521 and a second connecting segment 522 formed on the inner side thereof. After installation, the second sealing segment 521 extends obliquely toward the direction close to the first inner lip 51 to the inner ring 501 of the connecting body 50, and the second connecting segment 522 presses the side surface of the rod body 2. That is, from the cross section, the oil seal area 13 is an area enclosed by the first sealing segment 511, the inner ring 501 of the body 50, the second sealing segment 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 generated by the damping oil in the oil seal area 13 on the second sealing segment 521, the larger the sealing contact area between the second connecting segment 522 and the rod body 2 is forced to be. In other words, the higher the pressure in the oil seal area 13, the better the sealing performance at the second inner lip 52.

[0037] In some possible embodiments, reference Figure 5 As shown, the angle between the second sealing segment 521 and the second connecting segment 522 ranges from 100° to 110°. After installation, the second connecting segment 522 is in sealing contact with the side surface of the rod body 2. The second sealing segment 521 serves as one of the inner walls of the oil seal area 13, and the second sealing segment 521 extends obliquely from the connection between it and the second connecting segment 522 in a direction away from the center of the main body 50. When scraping oil, the second sealing segment 521 can serve as an inclined 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, thereby preventing the damping oil in the oil seal area 13 from leaking out from the second connecting segment 522.

[0038] In some possible embodiments, reference Figure 5As shown, a chamfered structure is formed between the second sealing segment 521 and the second connecting segment 522. The radius of the chamfered structure is 0.03mm to 0.06mm. The purpose is to ensure the structural strength of the connection between the second sealing segment 521 and the second connecting segment 522, and to avoid bending of the connection during installation, which may cause the rear section of the second connecting segment 522 to be unable to seal with the rod body 2.

[0039] In some possible embodiments, reference Figure 5 As shown, a second ring portion 523 is also formed at the free end of the second inner lip 52, and the second ring portion 523 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 transitionally connected to the outer side surface of the second inner lip 52. During installation, the second horizontal section 5231 is affected by the deformation of the second inner lip 52, so that it can seal and fit the rod body 2. Such a design can increase the contact area between the second inner lip 52 and the side surface of the rod body 2, thereby improving the sealing reliability at this location.

[0040] In some possible embodiments, reference Figure 8 and Fig. 9 As shown, the oil seal area 13 is an oil storage tank which is recessed on the inner side of the main body 50 toward the direction away from the center of the main body 50. The inner diameter of the main body 50 is larger than the rod diameter of the rod body 2. The two ends of the oil storage tank are respectively connected to the first inner lip 51 and the second inner lip 52, so that the oil seal area 13 is formed in the area where the inner ring 501 of the main body 50 is located between the first inner lip 51 and the second inner lip 52, and the damping oil leaked from the first inner lip 51 will be stored in the oil seal area 13.

[0041] In some possible embodiments, reference 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 one end of the body 50 close to the reflux chamber 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 one end of the body 50 away from the reflux chamber 111, and a mounting ring groove 56 is formed between the second inner lip 52 and the second outer lip 54, and the damping oil in the reflux chamber 111 generates equal normal pressure on each point of the pressure ring groove 55, so that the pressure ring groove 55 is stretched, that is, the first inner lip 51 and the first outer lip 53 are formed between the first inner lip 51 and the first outer lip 53. An inner lip 51 fits the rod body 2 more tightly and the first outer lip 53 fits the inner wall of the cylinder body 1 more tightly, and the mounting ring groove 56 is used to install the positioning ring 6. The positioning ring 6 always presses the mounting ring groove 56 to open the mounting ring groove 56, that is, the second inner lip 52 fits the rod body 2 more tightly and the second outer lip 54 fits the inner wall of the cylinder body 1 more tightly. It can be seen that the first inner lip 51 and the first outer lip 53 of the lip-shaped sealing ring 5 of the present application can be used as a first sealing structure to prevent damping oil leakage, and the second inner lip 52 and the second outer lip 54 are used as a second sealing structure, thereby playing a double sealing insurance role.

[0042] In some possible embodiments, reference 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 main body 50. Specifically, the opening direction of the pressure ring groove 55 is toward the pressure direction of the damping oil. Therefore, the greater the damping oil pressure in the reflux chamber 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 body 2 extends outward, the second inner lip 52 can scrape off the damping oil on the rod body 2 and prevent the damping oil from leaking.

[0043] In some possible embodiments, reference 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 the outer side thereof, the third sealing section 531 is pressed 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, the free end of the first outer lip 53 is formed with a third ring portion 533, the outer diameter of the third ring portion 533 is adapted to the inner diameter of the cylinder body 1, and 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, and the third horizontal section 5331 is connected to the inner wall of the cylinder body 1. The other end of 331 is connected to the third connecting section 532, and the other end of the third vertical section 5332 is transitionally connected to the inner side surface arc of the first outer lip 53. When in use, since the third sealing section 531 is sealed and connected to the inner wall of the cylinder body 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 further deform in the direction close to the center of the main body 50, so as to increase the contact area between the third sealing section 531 and the inner wall of the cylinder body 1.

[0044] In some possible embodiments, reference 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 the outside thereof, the fourth sealing section 541 is pressed 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, the free end of the second outer lip 54 is formed with a fourth ring portion 543, and 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 transitionally connected to the inner side surface of the second outer lip 54 by a circular arc. During installation, the fourth horizontal section 5431 is affected by the deformation of the second outer lip 54, so that it can be sealed and fitted on the inner wall of the cylinder body 1. Such a design can increase the contact area between the second outer lip 54 and the side surface of the cylinder body 1, thereby improving the sealing reliability there.

[0045] In some possible embodiments, reference Figure 3 As shown, the extension length of the third sealing segment 531 is greater than the extension length of the fourth sealing segment 541, that is, after installation, the deformation of the third sealing segment 531 is greater than the deformation of the fourth sealing segment 541. This is because the first outer lip 53 has to withstand the pressure of the damping oil in the reflux chamber 111, so the sealing performance at the first outer lip 53 is higher than the sealing performance of the second outer lip 54; further, the third sealing segment 531 and the third connecting segment 532 are connected by an arc transition, and the fourth sealing segment 541 and the fourth sealing segment 541 are connected by an arc transition.

[0046] The present invention also provides a damper, referring to Figure 8 and Fig. 9As shown, the damper includes a cylinder body 1 and a rod body 2. The lip seal 5 of the above embodiment is installed in the cylinder body 1 to divide the inner cavity of the cylinder body 1 into a damping oil chamber 11 and an elastic compensation chamber 12. One end of the rod body 2 passes through the inner ring of the lip seal 5 and extends into the cylinder body 1, and the other end extends to the outside of the cylinder body 1. The damping oil chamber 11 is filled with damping oil. A piston 3 is provided at one end of the rod body 2 located in the cylinder body 1. The piston 3 divides the damping oil chamber 11 into a reflux chamber 111 and a working chamber 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 body 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 body 2. After the rod body 2 repeatedly moves along its axial direction relative to the cylinder body 1 for many times, the first inner lip 51 may be worn and its sealing effect may be deteriorated, and the damping oil in the reflux chamber 111 leaks from the first inner lip 51 and the side surface of the rod body 2 to the oil seal area 13, while the damping oil in the oil seal area 13 is blocked by the second inner lip 52, thereby reducing the risk of the damping oil leaking into the elastic compensation chamber 12, and further reducing the risk of the damping oil leaking out of the cylinder body 1. It can be seen that such a design can improve the sealing effect of the lip seal ring 5 and enhance the sealing performance of the lip seal ring 5 and The service life of the damper; as the number of reciprocating motions of the rod body 2 increases, the damping oil leaked into the oil seal area 13 gradually increases until the oil seal area 13 is filled. Due to the incompressible nature of the damping oil, when the rod body 2 retracts, the volume of the reflux chamber 111 increases and the pressure therein decreases. When the pressure in the reflux chamber 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 reflux chamber 111 from between the first inner lip 51 and the rod body 2, thereby forming a reliable sealing state, which more effectively ensures that the damping oil will not leak out of the cylinder body 1.

[0047] In some possible embodiments, reference Fig. 9 As shown, the first inner lip 51 is located at one end of the damping oil chamber 11, more precisely, at one end of the reflux chamber 111, and the second inner lip 52 is located at one end of the elastic compensation chamber 12. The damping oil in the reflux chamber 111 generates 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. A positioning ring 6 and an elastic member 4 are provided in the elastic compensation chamber. The elastic member 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 causes it to produce an automatic compensation effect, thereby ensuring that the second inner lip 52 is always pressed against the rod body 2 and the second outer lip 54 is always pressed against the inner wall of the cylinder body 1.

[0048] In some possible embodiments, reference Fig. 9As shown, one end of the positioning ring 6 has a crimping platform 61, and the crimping platform 61 forms a first inclined surface 611 and a second inclined surface 612 at one end close to the lip sealing ring 5. Under the elastic restoring force of the elastic member 4, the first inclined surface 611 and the second inclined surface 612 always correspond to the two inner side surfaces of the crimped mounting ring groove 56, that is, the first inclined surface 611 always crimps the outer side surface of the second inner lip 52, and the second inclined surface 612 always crimps the inner side 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 crimping platform 61 can be crimped in the mounting ring groove 56 in a aligned manner.

[0049] In some possible embodiments, reference Fig. 9 As shown, the inner diameter of the damping oil chamber 11 is smaller than the inner diameter of the elastic compensation chamber 12, and a limiting step 14 is formed between the damping oil chamber 11 and the elastic compensation chamber 12. During installation, the end surface of the first outer lip 53 (i.e., the third vertical section 5332) will abut against the limiting step 14, thereby ensuring that the lip sealing ring 5 is positioned and installed in the cylinder body 1.

[0050] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. Lip seal, characterized in that: The invention comprises a body (50), wherein the inner ring (501) of the body (50) comprises a first inner lip (51) and a second inner lip (52), wherein an oil seal area (13) is formed between the first inner lip (51) and the second inner lip (52), and when the rod (2) moves in the axial direction, hydraulic oil leaking from the first inner lip (51) and remaining on the surface of the rod (2) is scraped off by the second inner lip (52) and stored in the oil seal area (13), and the cross section of the first inner lip (51) comprises a first sealing section (511) and a first connecting section (512) formed on the inner side thereof, wherein the first sealing section (511) is pressed 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 and in an inclined direction towards the center of the body (50).

3. The lip seal ring according to claim 2, characterized in that: The inclination angles of the first inner lip (51) and the second inner lip (52) are equal, 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 dimension of the first inner lip (51) is smaller than the thickness dimension of the second inner lip (52).

5. The lip seal ring according to claim 1, characterized in that: A first ring portion (513) is formed at the free end of the first inner lip (51), and the inner diameter of the first ring portion (513) is 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) comprises 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 (512), and the other end of the first vertical section (5132) is connected to the outer side surface of the first inner lip (51) in 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) comprises a second sealing section (521) and a second connecting section (522) formed on the inner side thereof, the second sealing section (521) extending obliquely toward the first inner lip (51) to connect to the inner ring (501) of the body (50), and the second connecting section (522) is pressed against the side surface of the rod body (2).

8. The lip seal ring according to claim 7, characterized in that: A second ring portion (523) is formed at the free end of the second inner lip (52), and the inner diameter of the second ring portion (523) is adapted to the rod diameter of the rod body (2).

9. The lip seal ring according to claim 8, characterized in that: The second ring portion (523) comprises a second horizontal section (5231) and a second vertical section (5232) connected at one end, and the other end of the second vertical section (5232) is transitionally connected to the outer side surface of the second inner lip (52) in an arc shape.

10. The lip seal ring according to claim 1, characterized in that: The oil seal area (13) is an oil storage groove which is 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 body (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 therebetween, and the second inner lip (52) and the second outer lip (54) are located at another same end of the body (50) and a mounting ring groove (56) is formed therebetween.

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 and in an inclined direction away from 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) comprises a third sealing section (531) and a third connecting section (532) formed on the outer side thereof, the third sealing section (531) being pressed 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) comprises a fourth sealing section (541) and a fourth connecting section (542) formed on the outer side thereof, the fourth sealing section (541) being pressed 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: A third ring portion (533) is formed at the free end of the first outer lip (53), and 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) comprises a third horizontal section (5331) and a third vertical section (5332) connected at one end, and the other end of the third vertical section (5332) is transitionally connected to the inner side surface of the first outer lip (53) in a circular arc.

16. The lip seal ring according to claim 14, characterized in that: A fourth ring portion (543) is formed at the free end of the second outer lip (54), and 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) comprises a fourth horizontal section (5431) and a fourth vertical section (5432) connected at one end, and the other end of the fourth vertical section (5432) is transitionally connected to the inner side surface of the second outer lip (54) in the form of an arc.

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 a normal pressure on the surface of the pressure ring groove (55).

18. A damper, characterized in that The invention comprises a cylinder body (1) and a rod body (2), wherein a lip seal ring (5) as claimed in any one of claims 1 to 17 is arranged in the cylinder body (1), and the lip seal ring (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 ring (5), the first inner lip (51) and the second inner lip (52) are both pressed against the side surface of the rod body (2), and 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 chamber (11), and the second inner lip (52) is located at one end of the elastic compensation chamber (12). The damping oil generates pressure on the first inner lip (51) so that it is pressed against the side surface of the rod body (2). A positioning ring (6) and an elastic member (4) are also provided in the elastic compensation chamber (12). The elastic member (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 crimping platform (61), and the crimping platform (61) forms a first inclined surface (611) and a second inclined surface (612) at one end close to the lip seal ring (5), the first inclined surface (611) is crimped to the outer side surface of the second inner lip (52), and the second inclined surface (612) is crimped to the inner side 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).

Images