Magneto-rheological shock absorber sealing assembly

Abstract

The utility model relates to the technical field of sealing, in particular to a magneto-rheological shock absorber sealing assembly which comprises a piston rod and a guider, the guider is arranged outside the piston rod in a sleeved mode, and the guider is provided with a first sealing groove for containing a first oil seal assembly. The first oil seal assembly comprises a first oil seal ring and a second sealing body connected with the first oil seal ring in the circumferential direction, one end of the first oil seal ring extends towards the piston rod to form a first antenna, the first antenna is provided with at least one first sealing lip matched with the piston rod, the first oil seal ring is made of polyurethane materials, and the second oil seal ring is made of polyurethane materials. The first oil seal ring is made of a polyurethane material, has certain elasticity and is very wear-resistant, metal particles in magnetorheological fluid cannot be adsorbed in the using process, the phenomenon that the metal particles are accumulated to scratch a lip is avoided, the second sealing body can compensate performance degradation of the polyurethane material at high temperature, the strength and sealing performance of the polyurethane material are improved, and the service life of the oil seal is prolonged. The service life of the sealing assembly is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing, in particular to a magnetorheological shock absorber sealing component. Background Art

[0002] Shock absorbers are critical components on vehicles, directly impacting ride comfort. Magnetorheological (MR) technology has elevated the performance of automotive suspension damping systems to new heights. In MR shock absorbers, controllable MR fluid replaces the traditional liquid in each shock absorber. The design challenges of MR shock absorber oil seals are: first, metal particles within the MR fluid can wear and scratch the oil seal lip, causing the shock absorber to leak and fail; second, MR shock absorbers are single-tube shock absorbers with high internal pressure, which can easily cause the oil seal to rupture, leading to oil leakage and failure.

[0003] The utility model patent with authorization announcement number CN220869954U discloses a magnetorheological shock absorber guide oil seal. The inner ring of the guide oil seal has a recessed portion, and a corrugated groove is provided in the recessed portion. The inner ring of the guide oil seal forms a sealing boss at a position corresponding to the position below the recessed portion. The guide oil seal is a polyurethane oil seal. The polyurethane oil seal in the above-mentioned disclosed scheme has the characteristics of high temperature resistance and can significantly improve the service life of the guide seal. However, the disclosed scheme does not fully consider and solve the strength problem of polyurethane under the action of oil pressure, and the problem that the strength and stiffness of the polyurethane material in the magnetorheological shock absorber decrease as the temperature rises, resulting in poor sealing. Utility Model Content

[0004] Technical purpose: In order to overcome the deficiencies in the prior art, the utility model provides a magnetorheological shock absorber sealing assembly.

[0005] Technical solution: To achieve the above-mentioned purpose, the utility model discloses a magnetorheological shock absorber sealing assembly, including a piston rod and a guide, the guide being sleeved on the outside of the piston rod, the guide being provided with a first sealing groove for accommodating a first oil seal assembly, the first oil seal assembly including a first oil seal ring and a second sealing body circumferentially connected to the first oil seal ring, one end of the first oil seal ring extending toward the piston rod to form a first tentacle, the first tentacle being provided with at least one first sealing lip cooperating with the piston rod, and the first oil seal ring being made of polyurethane.

[0006] Preferably, the second sealing body is made of PTFE and is located in a recess formed by the first feeler and the piston rod. The second sealing body is conformable to the recess, and a corrugated groove is further provided on the contact side of the second sealing body and the piston rod.

[0007] Preferably, the first oil seal ring has a Y-shaped cross section, and is further provided with a limiting boss cooperating with the first sealing groove, and a second sealing lip A cooperating with the side wall of the first sealing groove in a circumferential sealing manner.

[0008] Preferably, the second sealing body is made of rubber, and the first oil seal ring body is provided with a cavity portion for accommodating the second sealing body, and a second sealing lip B for circumferential sealing cooperation with the side wall of the first sealing groove.

[0009] Preferably, the second sealing body is made of metal and includes a first supporting end and a second supporting end. One end of the first oil seal ring is covered on the end of the second supporting end. The outer side surfaces of the first supporting end and the second supporting end are in contact with the first sealing groove.

[0010] Preferably, the first oil seal ring is further provided with a transition connection portion extending toward the inner side surfaces of the first supporting end and the second supporting end and connected to the first supporting end and the second supporting end.

[0011] Preferably, a groove cavity is formed between the second sealing body and the first oil seal ring, and a third sealing body adapted to the inner shape of the groove cavity is circumferentially embedded in the groove cavity, and the third sealing body is made of rubber.

[0012] Preferably, the third sealing body may further be provided with a supporting frame on an inner side surface close to the first supporting end.

[0013] Preferably, the guide is provided with a second sealing groove for accommodating a second oil seal assembly at an end away from the first sealing groove, the second oil seal assembly includes a first skeleton, a first rubber layer and a first wrap spring, the first rubber layer is covered on the surface of the first skeleton, one side of the first rubber layer extends toward the piston rod to form a second contact pin and a third contact pin, the first wrap spring is connected to the second contact pin and the third contact pin, respectively, and the second contact pin and the third contact pin are provided with at least one third sealing lip.

[0014] Preferably, the guide is provided with a dustproof sealing groove for accommodating a dustproof seal at an end away from the first sealing groove, one end of the dustproof seal extends toward the piston rod to form a fourth tentacle, and the fourth tentacle is provided with at least one dustproof sealing lip.

[0015] The beneficial effects of the utility model are:

[0016] 1. The first oil seal ring is made of polyurethane, which has certain elasticity and is very wear-resistant. In addition, the polyurethane material will not absorb metal particles in the magnetorheological fluid during use, causing metal particles to accumulate at the lip, scratching the lip and causing seal failure. The second sealing body circumferentially connected to the first oil seal ring can compensate for the performance degradation of the polyurethane material under high temperature during operation, improve the strength and sealing performance of the polyurethane material, extend the service life of the sealing component, and reduce the frequency of maintenance and inspection.

[0017] 2. The combined use of the first oil seal assembly and the second oil seal assembly can further extend the service life of the sealing assembly. The first oil seal assembly can effectively prevent the metal particles in the magnetorheological fluid from damaging the second oil seal assembly, while the second oil seal assembly can seal the magnetorheological fluid to prevent leakage. The combined use of the two can extend the service life of the sealing assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the assembly of the first oil seal assembly in the first embodiment of the present utility model;

[0019] Figure 2 This is a cross-sectional view of the first oil seal assembly in the first embodiment of the utility model;

[0020] Figure 3 This is a cross-sectional view of the first oil seal assembly in the second embodiment of the present utility model;

[0021] Figure 4 This is a cross-sectional view of the first oil seal assembly in the third embodiment of the present utility model;

[0022] Figure 5 This is a cross-sectional view of the first oil seal assembly in the fourth embodiment of the present utility model;

[0023] Figure 6 This is a cross-sectional view of the first oil seal assembly in the fifth embodiment of the present utility model;

[0024] Figure 7 This is a schematic diagram of the assembly of the first oil seal assembly in the second embodiment of the present utility model;

[0025] Figure 8 This is a schematic diagram of the assembly of the first oil seal assembly in the third embodiment of the present utility model;

[0026] Figure 9 This is a schematic diagram of the assembly of the first oil seal assembly in the fourth embodiment of the present utility model;

[0027] Figure 10 This is a schematic diagram of the assembly of the first oil seal assembly in the fifth embodiment of the present utility model;

[0028] Figure 11 This is a cross-sectional view of the second oil seal assembly in the present utility model;

[0029] Figure 12 This is a schematic diagram of the dustproof seal assembly in the present utility model.

[0030] In the figure, 1. piston rod; 2. guide; 3. first sealing groove; 4. first oil seal assembly; 5. first oil seal ring; 6. second sealing body; 601. first supporting end; 602. second supporting end; 7. first feeler; 8. first sealing lip; 9. recessed portion; 10. corrugated groove; 11. limiting boss; 12. second sealing lip A; 13. cavity portion; 14. second sealing lip B; 15. transition connection portion; 16. groove cavity; 17. third sealing body; 18. supporting frame; 19. second oil seal assembly; 20. second sealing groove; 21. first frame; 22. first rubber layer; 23. first wrap spring; 24. second feeler; 25. third feeler; 26. third sealing lip; 27. dustproof seal; 28. dustproof sealing groove; 29. ​​fourth feeler; 30. dustproof sealing lip. DETAILED DESCRIPTION

[0031] The following is combined with Figure 1 To the attached Figure 11 The principles and features of the present invention are described, and the examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0032] A magnetorheological shock absorber sealing assembly, such as Figure 1 As shown, it includes a piston rod 1 and a guide 2, which is sleeved on the outside of the piston rod 1. The guide 2 is provided with a first sealing groove 3 for accommodating a first oil seal assembly 4. The first oil seal assembly 4 includes a first oil seal ring 5 and a second sealing body 6 circumferentially connected to the first oil seal ring 5. One end of the first oil seal ring 5 extends toward the piston rod 1 to form a first feeler 7. The first feeler 7 is provided with at least one first sealing lip 8 that cooperates with the piston rod 1. The first oil seal ring 5 is made of polyurethane. The polyurethane material has certain elasticity and is wear-resistant. When used as a magnetorheological shock absorber seal, compared with the equally wear-resistant polytetrafluoroethylene material, polyurethane is not easy to absorb metal particles in the magnetorheological fluid, so it can avoid being scratched by the metal particles in the magnetorheological fluid. In addition, due to the high hardness of the material itself and good pressure bearing capacity, the service life can be extended.

[0033] like Figure 2As shown, in the first embodiment, the second sealing body 6 is located in the recess 9 formed by the first antenna 7 and the piston rod 1. The second sealing body 6 is conformal to the recess 9. The second sealing body 6 is made of PTFE and is also provided with a corrugated groove 10 on the side of the second sealing body 6 that contacts the piston rod 1. This can reduce the friction between the second sealing body 6 and the piston rod 1 during operation and improve the sealing and lubrication effect. When the oil pressure in the shock absorber acts on the first oil seal ring 5, the first antenna 7 elastically deforms under the pressure, and the first sealing lip 8 forms a sealing contact surface with the piston rod 1. However, if the sealing contact surface is too large, the friction between the first sealing lip 8 and the piston rod 1 will increase. The provision of the second sealing body 6 can increase the strength of the first oil seal ring 5, provide support for the first oil seal ring 5, and reduce friction while forming an effective seal, preventing the first antenna 7 from excessively deforming under the action of the oil pressure. Furthermore, the first oil seal ring 5 has a Y-shaped cross-section and adopts an interference fit with the first sealing groove 3. The first oil seal ring 5 is also provided with a limiting boss 11 that cooperates with the first sealing groove 3, which can effectively limit the position during the assembly process to prevent excessive extrusion from causing damage to the first oil seal ring 5 during the installation stage. In order to prevent metal particles in the magnetorheological fluid from entering through the gap between the first oil seal ring 5 and the side wall of the first sealing groove 3, the first oil seal ring 5 is provided with a second sealing lip A12 that cooperates with the side wall of the first sealing groove 3 in a circumferential seal.

[0034] like Figure 3 As shown, in the second embodiment, since the strength of the polyurethane material decreases seriously as the temperature rises when the temperature exceeds 120°C, in order to compensate for the poor sealing performance of the first oil seal ring 5 caused by the performance attenuation of the first oil seal ring 5 at high temperature, the first oil seal ring 5 body is provided with a cavity portion 13 for accommodating the second sealing body 6. The second sealing body 6 is made of rubber and is vulcanized separately. Specifically, the rubber material can be NBR or HNBR or FKM. In this embodiment, the cross-section of the second sealing body 6 is O-shaped and is installed in the cavity portion 13 through elastic deformation. After installation, the second sealing body 6 applies radial pressure to the first sealing lip 8. By applying pressure to the first sealing lip 8, the sealing effect of the first oil seal ring 5 is ensured. In order to prevent The metal particles in the magnetorheological fluid enter through the gap between the first oil seal ring 5 and the side wall of the first sealing groove 3. The first oil seal ring 5 is provided with a second sealing lip B14 that cooperates with the side wall of the first sealing groove 3 in a circumferential seal. Of course, the cross-sectional shape of the second sealing body 6 can be O-shaped or other shapes such as a rectangle that are familiar to those skilled in the art. The second sealing body 6 here has significant advantages over the traditional spring structure. The traditional spring structure will cause the elastic expansion and contraction performance of the spring body to be stuck due to the metal particles in the magnetorheological fluid entering between the spring wires, and it will not be possible to effectively apply pressure to the first sealing lip 8. However, the second sealing body 6 in this embodiment will not fail due to the influence of metal particles, making the sealing performance more reliable.

[0035] like Figure 4As shown, in the third embodiment, in order to increase the strength of the first oil seal ring 5 and to ensure the sealing performance between the first oil seal ring 5 and the side wall of the first sealing groove 3 at high temperature, the second sealing body 6 is made of metal. The second sealing body 6 includes a first supporting end 601 and a second supporting end 602. One end of the first oil seal ring 5 is covered on the end of the second supporting end 602. The first oil seal ring 5 is further provided with a transition connection portion 15 extending toward the inner side of the first supporting end 601 and the second supporting end 602 and connected to the first supporting end 601 and the second supporting end 602. Specifically, the first oil seal ring 5 is provided with a transition connection portion 15 extending toward the inner side of the first supporting end 601 and the second supporting end 602 and connected to the first supporting end 601 and the second supporting end 602. The sealing ring 5 is bonded to the second sealing body 6 after gluing and injection molding. The first oil sealing ring 5 is integrally formed. When the first oil sealing assembly 4 is installed, the second sealing body 6 is installed in the first sealing groove 3 with an interference fit, so that the outer side surfaces of the first supporting end 601 and the second supporting end 602 are in contact with the first sealing groove 3, ensuring that the second sealing body 6 and the first sealing groove 3 are well sealed. At the same time, the second sealing body 6 plays a supporting role for the first oil sealing ring 5, which can increase the strength of the first oil sealing ring 5 when working. The sealing assembly assembly process is simple, efficient, and has a good sealing effect.

[0036] like Figure 5 As shown, in the fourth embodiment, in order to further increase the strength of the first oil seal ring 5 and ensure the durability of the sealing effect, the first oil seal ring 5 is bonded to the second sealing body 6 after gluing and injection molding. The first oil seal ring 5 is integrally formed, and a groove cavity 16 is formed between the second sealing body 6 and the first oil seal ring 5. A third sealing body 17 that is adapted to the internal shape of the groove cavity 16 is embedded in the circumferential direction of the groove cavity 16. The third sealing body 17 is made of rubber, which is vulcanized and molded separately and then installed. Specifically, the rubber material can be NBR, HNBR or FKM. When the first oil seal assembly 4 is installed, the third sealing body 17 is The second sealing body 6 is installed in the first sealing groove 3 with an interference fit, so that the outer side surfaces of the first supporting end 601 and the second supporting end 602 are in contact with the first sealing groove 3, ensuring that the second sealing body 6 and the first sealing groove 3 are well sealed. The third sealing body 17 is installed in the groove cavity 16 through elastic deformation and applies radial pressure to the first sealing lip 8. In this embodiment, the second sealing body 6 can effectively ensure the strength of the first oil seal ring 5, and the third sealing body 17 can improve the sealing performance of the first oil seal ring 5 during operation through its good elastic performance, and enhance its sealing performance when resisting lateral forces or high-frequency vibrations.

[0037] like Figure 6 As shown, in the fifth embodiment, on the basis of the fourth embodiment, in order to improve the convenience of installation of the third sealing body 17, and at the same time to further prevent the third sealing body 17 from being deformed and displaced under the action of pressure during operation, the third sealing body 17 can also be provided with a support frame 18 on the inner side surface near the first supporting end 601 to improve its strength. The third sealing body 17 is bonded to the support frame 18 by gluing and vulcanization treatment, and can be installed as a whole into the groove cavity 16 by press fitting.

[0038] like Figure 12 As shown, the guide 2 can be further provided with a dustproof sealing groove 28 for accommodating a dustproof seal 27 at the end away from the first sealing groove 3. One end of the dustproof seal 27 extends toward the piston rod 1 to form a fourth tentacle 29. The fourth tentacle 29 is provided with at least one dustproof sealing lip 30. In this embodiment, the main body of the dustproof seal 27 is made of rubber material, a wrap spring is connected to the fourth tentacle 29, and a dustproof sealing lip 30 is provided to prevent external dust from entering the interior of the shock absorber. The main function of the dustproof seal 27 is dustproof.

[0039] like Figure 1 and Figure 7 — Figure 11 As shown, in order to further enhance the sealing performance of the sealing assembly, the guide 2 can also be provided with a second sealing groove 20 for accommodating the second oil seal assembly 19 at the end away from the first sealing groove 3. The second oil seal assembly 19 includes a first skeleton 21, a first rubber layer 22 and a first wrap spring 23. The first rubber layer 22 is covered on the surface of the first skeleton 21, and one side of the first rubber layer 22 extends toward the piston rod 1 to form a second contact pin 24 and a third contact pin 25. The first wrap spring 23 is connected to the second contact pin 24 and the third contact pin 25 respectively. The second contact pin 24 and the third contact pin 25 are provided with at least one third sealing lip 26. In this embodiment, the second contact pin 24 is provided with a third sealing lip 26 for dust prevention, and the third contact pin 25 is provided with two third sealing lips 26 for preventing liquid leakage in the shock absorber. When the sealing of the first oil seal assembly 4 fails, the second oil seal assembly 19 can still perform secondary sealing, and the second oil seal assembly 19 can also prevent the entry of external dust, thereby extending the service life of the sealing assembly and reducing the frequency of maintenance and replacement.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A magnetorheological shock absorber sealing assembly, comprising a piston rod (1) and a guide (2), wherein the guide (2) is sleeved on the outside of the piston rod (1), and is characterized in that: The guide (2) is provided with a first sealing groove (3) for accommodating a first oil seal assembly (4); the first oil seal assembly (4) comprises a first oil seal ring (5) and a second sealing body (6) circumferentially connected to the first oil seal ring (5); one end of the first oil seal ring (5) extends toward the piston rod (1) to form a first feeler (7); the first feeler (7) is provided with at least one first sealing lip (8) cooperating with the piston rod (1); and the first oil seal ring (5) is made of polyurethane.

2. The magnetorheological shock absorber sealing assembly according to claim 1, characterized in that: The second sealing body (6) is made of PTFE and is located in a recessed portion (9) formed by the first feeler (7) and the piston rod (1). The second sealing body (6) is conformable to the recessed portion (9). A corrugated groove (10) is also provided on the contact side of the second sealing body (6) and the piston rod (1).

3. The magnetorheological shock absorber sealing assembly according to claim 2, characterized in that: The first oil seal ring (5) has a Y-shaped cross section and is further provided with a limiting boss (11) cooperating with the first sealing groove (3), and a second sealing lip A (12) cooperating with the side wall of the first sealing groove (3) in a circumferential sealing manner.

4. The magnetorheological shock absorber sealing assembly according to claim 1, characterized in that: The second sealing body (6) is made of rubber, and the first oil seal ring (5) body is provided with a cavity portion (13) for accommodating the second sealing body (6), and a second sealing lip B (14) circumferentially sealingly matched with the side wall of the first sealing groove (3).

5. The magnetorheological shock absorber sealing assembly according to claim 1, characterized in that: The second sealing body (6) is made of metal and comprises a first supporting end (601) and a second supporting end (602). One end of the first oil seal ring (5) is covered on the end of the second supporting end (602). The outer side surfaces of the first supporting end (601) and the second supporting end (602) are in contact with the first sealing groove (3).

6. The magnetorheological shock absorber sealing assembly according to claim 5, characterized in that: The first oil seal ring (5) is further provided with a transition connection portion (15) extending toward the inner side surfaces of the first supporting end (601) and the second supporting end (602) and connected to the first supporting end (601) and the second supporting end (602).

7. The magnetorheological shock absorber sealing assembly according to claim 5, characterized in that: A groove cavity (16) is formed between the second sealing body (6) and the first oil seal ring (5), and a third sealing body (17) adapted to the internal shape of the groove cavity (16) is embedded in the circumference of the groove cavity (16), and the third sealing body (17) is made of rubber.

8. The magnetorheological shock absorber sealing assembly according to claim 7, characterized in that: The third sealing body (17) may also be provided with a supporting frame (18) on the inner side surface close to the first supporting end (601).

9. The magnetorheological shock absorber sealing assembly according to claim 1, characterized in that: The guide (2) is provided with a second sealing groove (20) for accommodating a second oil seal assembly (19) at an end away from the first sealing groove (3). The second oil seal assembly (19) includes a first skeleton (21), a first rubber layer (22) and a first wrap spring (23). The first rubber layer (22) is covered on the surface of the first skeleton (21). One side of the first rubber layer (22) extends toward the piston rod (1) to form a second contact pin (24) and a third contact pin (25). The first wrap spring (23) is connected to the second contact pin (24) and the third contact pin (25) respectively. The second contact pin (24) and the third contact pin (25) are provided with at least one third sealing lip (26).

10. The magnetorheological shock absorber sealing assembly according to claim 1, characterized in that: The guide (2) is provided with a dustproof sealing groove (28) for accommodating a dustproof seal (27) at an end away from the first sealing groove (3); one end of the dustproof seal (27) extends toward the piston rod (1) to form a fourth feeler (29); and the fourth feeler (29) is provided with at least one dustproof sealing lip (30).

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