Rotary sealing assembly, hub bearing assembly, tire and vehicle

Abstract

The invention discloses a rotary sealing assembly, a hub bearing assembly, a tire and a vehicle. The rotary sealing assembly comprises a rotary ring, a first sealing ring and a second sealing ring, the fixed ring is coaxially opposite to the rotating ring and is provided with a second air channel; the sealing piece comprises an inner sealing ring and an outer sealing ring which are arranged between the rotating ring and the fixed ring, the rotating ring, the fixed ring, the inner sealing ring and the outer sealing ring define an air cavity, and the first air channel and the second air channel are communicated through the air cavity. According to the technical scheme, when the rotating ring and the wheel rotate synchronously, the first air channel in the rotating ring can be connected with the interior of a tire, the second air channel in the fixed ring can be connected with an air source, the sealing piece can form a closed air cavity between the first air channel and the second air channel, and the air cavity is simple in structure, convenient to manufacture and capable of providing good air tightness; and it is guaranteed that inflation and deflation adjustment operation in the tire is stable and reliable when the wheel rotates.

Description

Technical Field

[0001] The present disclosure relates to the technical field of vehicle manufacturing, and in particular to a rotary seal assembly, a wheel hub bearing assembly, a tire, and a vehicle. Background Art

[0002] Inflating and deflation devices are widely used in various fields, and there are usually strict requirements for air tightness during the inflation and deflation process. Among them, the reliability of the movable seals of rotating parts is often not high. For example, some solutions open an air channel on the rotating shaft itself and set a gas-conducting jacket on the outer periphery. However, the shaft is prone to deformation under long-term use conditions, destroying the sealing structure between the jacket and the shaft, resulting in airtight failure. There are also structures in which two ring structures are sequentially arranged on the shaft, one of which is fixed to the shaft and has an air channel, and the other is provided with a sealing structure. However, the two are prone to wear during relative friction movement, which leads to seal failure.

[0003] A typical structure is an inflation and deflation device used in vehicle tires. This device fits over the wheel hub bearing to coordinate with the wheel's rotation, adjusting tire pressure while the vehicle is in motion. However, its internal air passages are long and complex, making it difficult to manufacture. Furthermore, the seal between the tire and the wheel hub struggles to ensure effective airtightness during wheel rotation. Summary of the Invention

[0004] The purpose of the present disclosure is to provide a rotary seal assembly, a wheel hub bearing assembly, a tire and a vehicle to at least partially solve the problems existing in the above-mentioned related technologies.

[0005] In order to achieve the above-mentioned objectives, an embodiment of the first aspect of the present disclosure provides a rotating sealing assembly including: a rotating ring, which is provided with a first air channel; a fixed ring, which is coaxially opposite to the rotating ring and is provided with a second air channel; and a sealing member, including an inner sealing ring and an outer sealing ring arranged between the rotating ring and the fixed ring, and the outer sealing ring is located radially outside the inner sealing ring; wherein the rotating ring, the fixed ring, the inner sealing ring and the outer sealing ring together form an air cavity, and the first air channel and the second air channel are connected through the air cavity.

[0006] Optionally, the inner sealing ring includes a first skeleton fixed to one of the fixed ring and the rotating ring, and a first sealing lip capable of rotating and rubbing against the other ring.

[0007] Optionally, the outer sealing ring includes a second skeleton fixed to one of the fixed ring and the rotating ring and a second sealing lip capable of rotating and rubbing against the other ring.

[0008] Optionally, the first sealing lip and the second sealing lip are respectively multi-lip structures.

[0009] Optionally, the first skeleton and the second skeleton are respectively made of metal materials, and the first sealing lip and the second sealing lip are configured to be non-metallic flexible materials.

[0010] Optionally, the first skeleton is fixedly connected to the inner ring of the fixed ring, and the first sealing lip abuts against the radial inner side of the rotating ring and can rotate and rub against the rotating ring.

[0011] Optionally, the first sealing lip is an annular structure, and the inner sealing ring further includes an inner tension ring, which is coaxially arranged on the inner side of the first sealing lip and has a tensioning force to press the first sealing lip against the inner ring of the rotating ring.

[0012] Optionally, the second skeleton is fixedly connected to the outer ring of the fixed ring, and the second sealing lip abuts against the radial outer side of the fixed ring and rotates and rubs against the rotating ring.

[0013] Optionally, the second sealing lip is an annular structure, and the outer sealing ring further includes an outer tension ring, which is coaxially arranged on the outer ring of the second sealing lip and has a contraction force to press the second sealing lip to the outer ring of the rotating ring.

[0014] Optionally, the first sealing lip has a plurality of first lips abutting against the rotating ring; the second sealing lip has a plurality of second lips abutting against the rotating ring, and the number of the second lips is greater than the number of the first lips.

[0015] Optionally, an inner annular groove is formed on the end surface of the fixed ring facing the rotating ring, a first sealing ring is provided in the inner annular groove, and the first sealing ring is pressed tightly against the first frame.

[0016] Optionally, an outer annular groove is formed on the end surface of the fixed ring facing the rotating ring, a second sealing ring is provided in the outer annular groove, and the second sealing ring is pressed tightly against the second frame.

[0017] Optionally, the first skeleton is fixedly connected to the inner ring of the rotating ring, and the first sealing lip abuts against the radial inner side of the fixed ring and can rotate and rub against the fixed ring.

[0018] Optionally, the second skeleton is fixedly connected to the outer ring of the rotating ring, and the second sealing lip abuts against the radial outer side of the fixed ring and can rotate and rub against the fixed ring.

[0019] Optionally, a step portion is formed on one end of the rotating ring facing the fixed ring, the first skeleton is fitted on the radial inner wall of the step portion, and the second skeleton is fitted on the radial outer wall of the step portion.

[0020] Optionally, a first washer is provided between the first skeleton and the step portion, and a second washer is provided between the second skeleton and the step portion.

[0021] Optionally, the end of the fixed ring facing the rotating ring has an axial recess capable of avoiding the step portion, the step portion is at least partially accommodated in the axial recess, and the first sealing lip and the second sealing lip can respectively rotate and rub against the inner wall of the axial recess.

[0022] Optionally, the inner wall of the axial recess includes a bottom wall and two side walls, the first sealing lip has at least two lip edges and abuts at least the bottom wall and one of the side walls; the second sealing lip has at least two lip edges and abuts at least the bottom wall and one of the side walls.

[0023] Optionally, one end of the rotating ring facing the fixed ring is formed as a radially inwardly contracted step portion, and the inner sealing ring and the outer sealing ring are arranged on the step portion.

[0024] Optionally, the first air channel and the second air channel extend parallel to the axis of the rotating ring respectively.

[0025] Optionally, an end of the rotating ring close to the fixed ring is formed into an annular groove, and the first air channel is communicated with the annular groove.

[0026] Optionally, a step-shaped structure having a large diameter portion and a small diameter portion is formed in the first air passage, the small diameter portion is formed as a threaded section, and the threaded section is connected to the annular groove.

[0027] Optionally, one end of the second air channel close to the first air channel is formed into a gradually expanding trumpet-shaped structure.

[0028] The second aspect embodiment of the present disclosure provides a wheel hub bearing assembly, comprising: a wheel hub bearing, including a flange and a bearing outer ring that can rotate relative to each other; and the rotary seal assembly provided by the first aspect embodiment of the present disclosure, wherein the flange is provided with an air outlet connected to the first air duct, and the bearing outer ring is provided with an air inlet connected to the second air duct.

[0029] Optionally, a plurality of first bosses are provided on a side of the rotating ring facing the flange, wherein the first bosses are used to be connected to the flange, and the first air channel is formed in one of the first bosses.

[0030] Optionally, a plurality of mounting bosses are provided on a side of the flange facing the rotating ring, and the mounting bosses are axially connected to the first bosses.

[0031] Optionally, the bearing outer ring has a flange, and the fixed ring is axially butt-mounted on the flange; the rotating ring is axially butt-mounted on the flange.

[0032] Optionally, a plurality of second bosses are provided on a side of the fixing ring facing the flange, blind holes are formed on the plurality of second bosses, and a plurality of docking holes corresponding to the blind holes are formed on the flange.

[0033] Optionally, a recessed groove is provided at the docking position of the flange with the fixing ring, a third sealing ring is provided in the recessed groove, and the third sealing ring surrounds the second air passage and the air inlet.

[0034] Optionally, a plurality of countersunk holes are provided on the side of the fixing ring facing the flange, and the plurality of countersunk holes are staggered with the plurality of second bosses; a plurality of avoidance holes are provided on the flange, and the plurality of avoidance holes correspond to the positions of the plurality of countersunk holes.

[0035] Optionally, the air inlet includes a first section extending radially and a second section extending axially, the first section is used to be connected to an air source, and the second section is used to be connected to the second air channel.

[0036] A third embodiment of the present disclosure provides a tire, comprising the hub bearing assembly provided by the second embodiment of the present disclosure.

[0037] A fourth embodiment of the present disclosure provides a vehicle, comprising the tire provided by the third embodiment of the present disclosure.

[0038] Through the above technical solution, a rotating ring and a fixed ring that can rotate relatively are provided on the wheel hub bearing. The rotating ring can connect the first air channel inside with the inside of the tire when rotating synchronously with the wheel, and the second air channel in the fixed ring can be connected to the air source. At the same time, a seal is provided between the rotating ring and the fixed ring to form a closed air cavity between the first air channel and the second air channel. The air cavity has a simple structure, is easy to manufacture, and can provide good air tightness, thereby ensuring that the inflation and deflation adjustment operation in the tire is stable and reliable when the wheel rotates.

[0039] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 It is a schematic structural diagram of a hub bearing according to an exemplary embodiment.

[0041] Figure 2 It is a schematic structural diagram of a rotary seal assembly according to an exemplary embodiment.

[0042] Figure 3 is a schematic axial cross-sectional view of a hub bearing according to an exemplary embodiment.

[0043] Figure 4 is a schematic axial cross-sectional view of a rotary seal assembly according to an exemplary embodiment.

[0044] Figure 5 is based on Figure 4 Enlarged view of part A.

[0045] Figure 6 is a schematic axial cross-sectional view of a rotary seal assembly according to an exemplary embodiment.

[0046] Figure 7 is based on Figure 6 Magnified view of part B.

[0047] Figure 8 It is a schematic structural diagram of a flange according to an exemplary embodiment.

[0048] Description of Reference Numerals 1-rotating ring, 11-first air channel, 111-threaded section, 12-first boss, 13-annular groove, 14-step portion, 2-fixed ring, 21-second air channel, 22-second boss, 221-blind hole, 231-inner annular groove, 232-outer annular groove, 241-first sealing ring, 242-second sealing ring, 25-countersunk hole, 201-axial notch, 3-seal, 31-inner sealing ring, 311-first skeleton, 312-first sealing lip, 313-inner expansion joint Force ring, 32-outer sealing ring, 321-second skeleton, 322-second sealing lip, 323-outer tension ring, 341-first gasket, 342-second gasket, 4-flange, 41-air outlet, 42-mounting boss, 421-rotating ring mounting hole, 422-wheel hub bearing positioning hole, 5-bearing outer ring, 501-flange, 51-air inlet, 511-first section, 512-second section, 52-docking hole, 53-sunk groove, 531-third sealing ring, 54-avoidance hole. DETAILED DESCRIPTION

[0049] The following describes the specific embodiments of the present disclosure in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present disclosure and are not intended to limit the present disclosure.

[0050] In this disclosure, unless otherwise stated, directional terms such as "inner" and "outer" refer to the inner and outer sides of the relevant parts relative to their own contours, and "axial" is defined according to the axial direction of the bearing. Figures 3 to 7 In the drawings, the left-right extending direction is the axial direction. In addition, the attributives "first", "second", etc. used in this disclosure are to distinguish one element from another element and do not have order or importance.

[0051] When the following description refers to the drawings, unless otherwise indicated, the same numerals in different drawings represent the same or similar elements.

[0052] A first aspect of the present disclosure provides a rotary seal assembly, referring to Figures 1 to 8 , comprising: a rotating ring 1, a fixed ring 2 and a sealing member 3. A first air channel 11 is provided in the rotating ring 1, and the fixed ring 2 is coaxially opposed to the rotating ring 1 and has a second air channel 21 formed therein. The sealing member 3 may comprise an inner sealing ring 31 and an outer sealing ring 32 provided between the rotating ring 1 and the fixed ring 2. The rotating ring 1, the fixed ring 2, the inner sealing ring 31 and the outer sealing ring 32 may together form an air cavity, through which the first air channel 11 and the second air channel 21 may communicate.

[0053] In the above embodiment, the rotating ring 1 and the stationary ring 2 are coaxially disposed relative to each other and can be respectively sleeved onto a shaft-like component to rotate with the shaft-like component. The rotating ring 1 and the stationary ring 2 are relatively rotatable. Because the seal 3 is disposed between the rotating ring 1 and the stationary ring 2, the air cavity formed therein is also an annular air cavity surrounding the rotating ring 1 and the stationary ring 2. During rotation, regardless of the position of the rotating ring 1, its first air passage 11 remains in communication with the second air passage 21 through this air cavity.

[0054] The first and second air channels 11, 21 are always connected to the air cavity, enabling gas transmission. At the gas connection points (where the first and second air channels 11, 21 connect to the air cavity), the gas generally flows axially, not radially. This type of gas connection is less affected by the aforementioned shaft components. Damage to the shaft components will not significantly affect the seal, as long as they can still drive the relative rotation of the rotating ring 1 and the stationary ring 2.

[0055] The following article uses the application of this sealing structure to a vehicle tire inflation and deflation device as an example to illustrate.

[0056] The rotating ring 1 can be connected to one end near the tire and rotates synchronously with the rotation of the wheel. The first air channel 11 can be connected to the interior of the tire, while the second air channel 21 of the fixed ring 2 can be connected to an external air supply source. When the tire needs to be inflated or deflated, the air source can be controlled to introduce air into the air cavity via the second air channel 21. The air entering the air cavity can then be introduced into the tire through the first air channel 11. Through the above technical solution, the rotating ring 1 and the fixed ring 2 are arranged on the wheel hub bearing (described below) so that they can rotate relative to each other. When the rotating ring 1 rotates synchronously with the wheel, the first air channel 11 inside the rotating ring 1 can be connected to the interior of the tire, while the second air channel 21 inside the fixed ring 2 can be connected to the air source. A seal 3 is provided between the rotating ring 1 and the fixed ring 2 to form a sealed air cavity between the first and second air channels 11 and 21. This air cavity has a simple structure, is easy to manufacture, and provides good airtightness, ensuring stable and reliable inflation and deflation operations within the tire during wheel rotation.

[0057] In some embodiments, reference Figures 3 to 7 The inner sealing ring 31 may include a first skeleton 311 fixed to one of the stationary ring 2 and the rotating ring 1, and a first sealing lip 312 capable of rotational friction with the other ring. In this embodiment, the inner sealing ring 31 forms a seal between the stationary ring 2 and the rotating ring 1 through the first skeleton 311 and the first sealing lip 312, and the first skeleton 311 and the first sealing lip 312 are respectively connected to one of the stationary ring 2 and the rotating ring 1. When the first skeleton 311 is connected to the rotating ring 1, the first sealing lip 312 can form rotational friction with the stationary ring 2 and provide a rotational seal between the stationary ring 2 and the rotating ring 1, ensuring airtightness between the two while satisfying the relative rotation action of the rotating ring 1 and the stationary ring 2.

[0058] For example, refer to Figures 3 to 7 The outer sealing ring 32 may include a second skeleton 321 fixed to one of the stationary ring 2 and the rotating ring 1 and a second sealing lip 322 capable of rotating and rubbing with the other. In this embodiment, the arrangement of the second skeleton 321 and the second sealing lip 322 of the outer sealing ring 32 between the stationary ring 2 and the rotating ring 1 may be the same as the arrangement of the first skeleton 311 and the first sealing lip 312 of the inner sealing ring 31 in the stationary ring 2 and the rotating ring 1, and will not be described in detail here. However, it should be noted that the inner sealing ring 31 and the outer sealing ring 32 may, according to actual production requirements, choose to connect the skeleton to one of the rotating ring 1 or the stationary ring 2 at the same time, or connect the first skeleton 311 to one of the rotating ring 1 or the stationary ring 2 and the second skeleton 321 to the other, so as to meet the sealing requirements under different working conditions and improve the versatility and adaptability of the rotary sealing assembly.

[0059] For example, refer to Figures 3 to 7The first sealing lip 312 and the second sealing lip 322 can be multi-lip structures respectively to improve the sealing effect through multiple friction contacts, and after the multiple lips form a rotating sealing connection with one of the rotating ring 1 or the fixed ring 2, a separate closed chamber can be formed between the multiple lips, thereby improving the overall sealing strength of the seal 3 and having waterproof and dustproof functions. Grease can also be stored in the separate closed chamber formed between the multiple lips according to actual needs to improve the lubrication effect of the seal 3, reduce friction loss, and increase the overall service life of the component.

[0060] For example, the first frame 311 and the second frame 321 can each be made of a metal material, such as low-carbon steel, stainless steel, or aluminum, to ensure the structural strength of the seal 3. The surface can be nickel-plated or zinc-plated to increase oxidation and corrosion resistance, thereby ensuring safe use in different environments. Furthermore, the first sealing lip 312 and the second sealing lip 322 can be made of a non-metallic flexible material, such as rubber, nitrile rubber, fluororubber, or silicone rubber, to improve the wear resistance and airtightness of the seal 3 and provide elastic protection for the frames, thereby increasing the overall service life. The first frame 311 can be integrally molded with the first sealing lip 312, and the second frame 321 can be integrally molded with the second sealing lip 322 to further enhance the sealing effect and structural strength. The integral molding process can include vulcanization (or other fixing processes), which is not specifically limited in this application.

[0061] In some embodiments, reference Figures 3 to 5 , the first skeleton 311 can be fixedly connected to the inner ring of the stationary ring 2, and the first sealing lip 312 can abut the radial inner side of the rotating ring 1 and can rotate and rub against the rotating ring 1. In this embodiment, the inner sealing ring 31 is fixed to the inner ring of the stationary ring 2 via the first skeleton 311. The first sealing lip 312 abuts the radial inner side of the rotating ring 1 to form a seal. When the rotating ring 1 rotates, the inner sealing ring 31 can achieve a rotational sealing connection with the rotating ring 1 through the first sealing lip 312 abutting the radial inner side of the rotating ring 1, thereby ensuring a good sealing effect when the two rotate relative to each other. When the rotating ring 1 has a structure such as the step portion 14 to be described below, the first sealing lip 312 can be correspondingly arranged on the outer peripheral wall of the step portion 14.

[0062] It should be noted that the radially inner side of the rotating ring 1 refers to the sidewalls of the rotating ring 1 in a radial direction, one relatively close to the axis and the other farther away from the axis. The location closer to the axis is the radially inner side of the rotating ring 1. As will be described below, the radially outer side refers to a location further away from the axis than the radially inner side. The above definitions of radially inner and radially outer sides also apply to other annular structures similar to the rotating ring 1 (such as the stationary ring 2).

[0063] For example, refer to Figures 3 to 5 The first sealing lip 312 can be an annular structure, and the inner sealing ring 31 can further include an inner tension ring 313. The inner tension ring 313 can be coaxially arranged inside the first sealing lip 312 and exert a tensioning force to press the first sealing lip 312 against the inner ring of the rotating ring 1. The inner tension ring 313 can be coaxially arranged with the rotating ring 1 and surround the inner side of the first sealing lip 312 to ensure that the tensioning force of the inner tension ring 313 is distributed perpendicular to the axial direction of the rotating ring 1, avoiding the generation of an offset force component in the axial direction of the rotating ring 1, which could cause the first sealing lip 312 to deform in an axial direction due to tension or compression, thereby affecting the sealing effect of the first sealing lip 312. In this embodiment, the inner tension ring 313 can consistently provide a preload force to tighten the sealing lip structure toward the first air passage 11. At least this preload force ensures that the sealing lip structure maintains reliable airtightness and sealing effect when in contact with the rotating ring 1, ensuring the stability of the structure in use.

[0064] In some embodiments, reference Figures 3 to 5 The second skeleton 321 can be fixedly connected to the outer ring of the stationary ring 2, and the second sealing lip 322 can abut the radially outer side of the stationary ring 2 and rotate and rub against the rotating ring 1. In this embodiment, the outer sealing ring 32 is fixed to the outer ring of the stationary ring 2 via the second skeleton 321. The second sealing lip 322 abuts the radially outer side of the rotating ring 1 to form a seal. When the rotating ring 1 rotates, the outer sealing ring 32 achieves a rotational sealing connection with the rotating ring 1 through the second sealing lip 322 abutting the radially outer side of the rotating ring 1, ensuring a good sealing effect during relative rotation between the two. This effect is similar to the connection method of the inner sealing ring 31 described above and will not be described in detail here.

[0065] For example, refer to Figures 3 to 5 The second sealing lip 322 can also be an annular structure, and the outer sealing ring 32 can include an outer tension ring 323. The outer tension ring 323 can be coaxially arranged on the outer ring of the second sealing lip 322 and has a contraction force that presses the second sealing lip 322 to the outer ring of the rotating ring 1. It can be understood that the outer tension ring 323 can be coaxially arranged with the rotating ring 1 and surround the outer side of the second sealing lip 322. The effect thereof can refer to the arrangement of the inner tension ring 313 and will not be described in detail here. At the same time, the outer tension ring 323 can also always provide a pre-tightening force from the radial outside to tighten the sealing lip structure toward the first air channel 11. This pre-tightening force can work together with the pre-tightening force of the inner tension ring 313 to at least ensure that the sealing lip structure has reliable airtightness and sealing effect when in contact with the rotating ring 1, thereby ensuring the stability of the structure in use.

[0066] For example, refer to Figures 3 to 5The first sealing lip 312 may have multiple first lips that abut against the rotating ring 1, and the second sealing lip 322 may have multiple second lips that abut against the rotating ring 1, with the number of second lips exceeding the number of first lips. For example, the number of first lips may be at least two, and the number of second lips may be at least three. In this embodiment, the multiple lips of the first sealing lip 312 that abut against the rotating ring 1 form at least one sealed chamber, thereby enhancing the sealing effect between the inner ring of the rotating ring 1 and the stationary ring 2. Furthermore, since the second sealing lip 322 also needs to protect against the intrusion of external impurities such as dust and moisture from the rotating seal assembly, the number of second lips of the second sealing lip 322 is set to be greater than the number of first lips. This creates at least two sealed chambers, and the sealed chamber located farthest from the air cavity provides additional protection against external impurities, thereby improving the airtightness of the outer sealing ring 32 and ensuring stable regulation after gas connection.

[0067] In some embodiments, reference Figures 3 to 5 The end surface of the fixed ring 2 facing the rotating ring 1 can be provided with an inner annular groove 231, and a first sealing ring 241 can be provided in the inner annular groove 231. The first sealing ring 241 can be tightly pressed against the first skeleton 311 to ensure the sealing effect between the first skeleton 311 and the outer ring of the fixed ring 2.

[0068] For example, refer to Figures 3 to 5 The end surface of the fixed ring 2 facing the rotating ring 1 can be provided with an outer annular groove 232, and a second sealing ring 242 can be provided in the outer annular groove 232. The second sealing ring 242 can be tightly pressed against the second skeleton 321 to ensure the sealing effect between the second skeleton 321 and the inner ring of the fixed ring 2.

[0069] In some embodiments, reference Figure 6 and Figure 7 The first frame 311 can be fixedly connected to the inner ring of the rotating ring 1, and the first sealing lip 312 can abut the radially inner side of the stationary ring 2 and can rotate and rub against the stationary ring 2. In this embodiment, the inner sealing ring 31 is fixed to the rotating ring 1 and can rotate with the rotating ring 1. The rotating inner sealing ring 31 can form a rotating sealing connection with the stationary ring 2 through the first sealing lip 312, providing a good airtight sealing effect for the space between the rotating ring 1 and the stationary ring 2 from the radial inner side.

[0070] For example, refer to Figure 6 and Figure 7The second skeleton 321 can be fixedly connected to the outer ring of the rotating ring 1, and the second sealing lip 322 can abut the radially outer side of the stationary ring 2 and can rotate and rub against the stationary ring 2. In this embodiment, the outer sealing ring 32 is fixed to the rotating ring 1 and can rotate with the rotating ring 1. The rotating outer sealing ring 32 can form a rotating sealing connection with the stationary ring 2 through the second sealing lip 322, thereby providing a seal for the space between the rotating ring 1 and the stationary ring 2 from the radially outward direction. The inner sealing ring 31 can rotate synchronously with the outer sealing ring 32, so that this space can be well sealed on both sides of the radial direction.

[0071] For example, refer to Figure 6 and Figure 7 A step portion 14 may be formed on the end of the rotating ring 1 facing the fixed ring 2. The first frame 311 may be disposed in affixed relation to the radially inner sidewall of the step portion 14, and the second frame 321 may be disposed in affixed relation to the radially outer sidewall of the step portion 14. In this embodiment, the first frame 311 and the second frame 321 may be press-fitted with the radially opposite sidewalls of the step portion 14 using an interference fit, thereby ensuring a stable connection between the frames and the rotating ring 1 and good airtightness at the connection.

[0072] For example, refer to Figure 6 and Figure 7 A first gasket 341 may be provided between the first frame 311 and the step portion 14, and a second gasket 342 may be provided between the second frame 321 and the step portion 14. In this embodiment, the first frame 311 can be sealed against the stepped surface of the step portion 14 by means of the compressed and deformed first gasket 341, and the second frame 321 can be sealed against the stepped surface of the step portion 14 by means of the compressed and deformed second gasket 342, thereby achieving a relatively comprehensive seal on both radial sides of the step portion 14. Furthermore, the first gasket 341 can be integrally formed with the first frame 311, and the second gasket 342 can be integrally formed with the second frame 321. This integral forming process can employ a curing method that is the same as or similar to the integral forming process of the frame and sealing lip, and will not be further described here.

[0073] For example, refer to Figure 6 and Figure 7 The end of the stationary ring 2 facing the rotating ring 1 may have an axial recess 201 that can accommodate the step 14. The step 14 can be at least partially accommodated within the axial recess 201, and the first sealing lip 312 and the second sealing lip 322 can respectively rotate and rub against the inner wall of the axial recess 201 to achieve a rotary sealing connection within the stationary ring 2. In this embodiment, the step 14 can at least partially extend into the axial recess 201, facilitating the structural arrangement of the first sealing lip 312 and the second sealing lip 322 and optimizing the spatial layout.

[0074] For example, refer to Figure 6 and Figure 7 The inner wall of the axial recess 201 may include a bottom wall and two side walls. The first sealing lip 312 may have at least two lips and abut against at least the bottom wall and one side wall. The second sealing lip 322 may have at least two lips and abut against at least the bottom wall and one side wall. In this embodiment, the bottom wall of the axial recess 201 is arranged radially and parallel to the rotation plane of the rotating ring 1. The two side walls of the axial recess 201 are two annular side walls arranged axially, and the diameters of the two side walls are different. The first sealing lip 312 and the second sealing lip 322 can be respectively configured to have a structure with two lips, so that the two lips can abut against the bottom wall and a nearby side wall inside the axial recess 201, respectively, to form an angular sealing cavity inside the two lips. The sealing cavity can be used to store grease to improve the lubrication effect of the seal 3, reduce friction resistance, and ensure the airtightness in the air cavity.

[0075] In other embodiments, the first sealing lip 312 and the second sealing lip 322 can also be respectively configured to have a structure with three lip edges, and the lip edge located in the middle position can abut against the intersection of the bottom wall and the side wall of the axial recess 201 to improve the structural strength of the sealing lip and ensure the service life of the seal 3.

[0076] In some embodiments, reference Figures 3 to 7 The end of the rotating ring 1 facing the fixed ring 2 can be formed into a radially inward-retracted step portion 14, and the inner sealing ring 31 and the outer sealing ring 32 can be arranged on the step portion 14, and specifically can be arranged at the radially inward-retracted position corresponding to the rotating ring 1, so as to hide the seal 3 at the connection between the rotating ring 1 and the fixed ring 2, prevent the seal 3 from being exposed to the outside, increase the risk of impurity invasion, improve the sealing effect of the seal 3, shorten the overall axial distance of the component, reduce the overall axial size of the component, reduce the space occupation, and optimize the spatial layout of the hub bearing.

[0077] In some embodiments, reference Figures 3 to 7 The first air channel 11 and the second air channel 21 can extend respectively parallel to the axis of the rotating ring 1, so that the first air channel 11 and the second air channel 21 can form a passage with the shortest path in the axial direction of the rotating ring 1, thereby increasing the gas circulation speed, improving the gas regulation efficiency, simplifying the air channel structure, facilitating manufacturing, and reducing the overall radial size of the component.

[0078] In some embodiments, reference Figures 3 to 7An annular groove 13 can be formed at one end of the rotating ring 1 near the fixed ring 2, and the first air channel 11 can communicate with the annular groove 13. The annular groove 13 can be provided on the rotating surface of the rotating ring 1 and coaxially arranged with the center of rotation to ensure that the first air channel 11 can communicate with the air cavity and the second air channel 21 through the annular groove 13 regardless of the rotation position. At the same time, the annular groove 13 can also expand the volume of the air cavity, providing storage space for the gas entering the air cavity, and increasing the upper limit of the adjustable gas in the tire to cope with extreme driving conditions.

[0079] For example, refer to Figures 3 to 7 A stepped structure having a large diameter portion and a small diameter portion may be formed in the first gas channel 11. The small diameter portion may be formed as a threaded segment 111, and the threaded segment 111 may be connected to the annular groove 13. In this embodiment, the threaded segment 111 can be used to connect and secure a gas pipeline inserted from the gas outlet 41 into the first gas channel 11. After the large diameter portion is screwed onto the joint on the gas pipeline and threaded onto the threaded segment 111, it can be compressed and fitted with a seal provided on the gas pipeline or joint to form a seal, further ensuring airtightness when gas is transferred to the gas pipeline through the first gas channel 11.

[0080] In some embodiments, reference Figures 3 to 7 One end of the second air channel 21 close to the first air channel 11 can be formed into a gradually expanding trumpet-shaped structure, which facilitates smooth flow of gas during the tire inflation and deflation process and reduces air flow loss.

[0081] A second aspect of the present disclosure provides a hub bearing assembly, referring to Figures 1 to 8 The wheel hub bearing assembly includes a wheel hub bearing and a rotary seal assembly provided by an embodiment of the first aspect of the present disclosure. The wheel hub bearing includes a flange 4 and a bearing outer ring 5 that are rotatable relative to each other. The flange 4 may be provided with an air outlet 41 communicating with the first air passage 11, and the bearing outer ring 5 may be provided with an air inlet 51 communicating with the second air passage 21. This allows the rotary seal assembly to be connected and fixed to the wheel hub bearing flange 4 via a rotating ring 1, and to be connected and fixed to the wheel hub bearing outer ring 5 via a fixing ring 2. After the rotary seal assembly is fixed to the wheel hub bearing, gas in the air source may enter the interior of the tire through the air inlet 51, sequentially through the second air passage 21, the first air passage 11, and the air outlet 41.

[0082] For example, refer to Figures 1 to 3 and Figure 8The side of the rotating ring 1 facing the flange 4 may be provided with a plurality of first bosses 12 for connection to the flange 4, and the first air channel 11 may be formed within one of the first bosses 12. In this embodiment, in order to increase the installation path length between the rotating ring 1 and the flange 4, a plurality of first bosses 12 protruding toward the flange 4 may be provided on the rotating ring 1 for connection to the flange 4. The plurality of first bosses 12 are evenly arranged in the rotation plane of the rotating ring 1 to meet the dynamic balance design distribution of the rotating ring 1 and prevent the center of gravity from shifting.

[0083] For example, refer to Figures 1 to 3 and Figure 8 The side of the flange 4 facing the rotating ring 1 may be provided with a plurality of mounting bosses 42. The mounting bosses 42 may be axially aligned with the first boss 12. That is, when the flange 4 is positioned and mounted on the rotating ring 1, the mounting bosses 42 and the first boss 12 may be gradually connected relative to each other along the axial direction (parallel to the central axis) to ensure a stable connection between the flange 4 and the rotating ring 1. The air outlet 41 may be provided between a pair of adjacent mounting bosses 42. The mounting bosses 42 may be formed with a rotating ring mounting hole 421 for positioning and mounting with the rotating ring 1. A wheel hub bearing positioning hole 422 may also be formed on the mounting bosses 42. The wheel hub bearing assembly may be positioned and mounted between the flange 4 and other structures of the wheel hub through the wheel hub bearing positioning hole 422, thereby achieving assembly of the wheel hub bearing assembly.

[0084] In the above embodiment, the multiple mounting bosses 42 of the flange 4 can be used to increase the length of the installation path between the flange 4 and the rotating ring 1, ensuring that the connection has sufficient structural strength and can be tightly matched with the first boss 12 to increase the connection stability of the assembly. It should be noted that since the air outlet 41 provided on the flange 4 is arranged between two adjacent mounting bosses 42, when the mounting boss 42 is axially docked with the first boss 12, a first boss 12 provided with the first air duct 11 can be set as an axially protruding step-like structure, so that when the first boss 12 and the mounting boss 42 are coaxially docked and installed, the first air duct 11 located at the protruding portion can be docked and positioned with the air outlet 41.

[0085] In some embodiments, reference Figures 1 to 3 and Figure 8 The bearing outer ring 5 may have a flange 501, the fixed ring 2 may be axially butt-jointed to the flange 501, and the rotating ring 1 may be axially butt-jointed to the flange 4, so as to avoid the rotating seal assembly being directly sleeved onto the rotating shaft, causing the rotating shaft to be affected by a large load, thereby reducing the structural strength and service life of the hub bearing assembly.

[0086] For example, refer to Figures 1 to 3The side of the fixing ring 2 facing the flange 501 may be provided with multiple second bosses 22, each of which may be provided with a blind hole 221. The flange 501 may be formed with multiple docking holes 52 corresponding to the multiple second bosses 22, for threaded connection with the bearing outer ring 5 when the multiple second bosses 22 are placed in the multiple docking holes 52. The multiple docking holes 52 are positioned relative to each of the multiple second bosses 22 so as to be axially connected thereto, and each docking hole 52 corresponds to a second boss 22. This allows the multiple second bosses 22 to be at least partially inserted into the docking holes 52 when connected thereto, thereby ensuring a tight connection between the two and ensuring safe use of the assembly.

[0087] For example, refer to Figures 1 to 3 A recessed groove 53 may be provided at the docking position of the flange 501 and the fixing ring 2, and a third sealing ring 531 may be provided in the recessed groove 53. The third sealing ring 531 may be provided around the second air duct 21 and the air inlet 51 to ensure that the junction of the second air duct 21 and the air inlet 51 has a good sealing effect, and prevent gas from escaping at the junction and causing airflow loss.

[0088] For example, refer to Figures 1 to 3 The side of the retaining ring 2 facing the flange 501 may also be provided with multiple countersunk holes 25. These countersunk holes 25 may be staggered with the second bosses 22. The flange 501 may also be provided with multiple relief holes 54. These relief holes 54 may correspond in position with the countersunk holes 25. This correspondence means that the relief holes 54 are positioned relative to the countersunk holes 25 so that they can be axially connected. Each relief hole 54 corresponds to a second boss 22, allowing the bearing outer ring 5 to be connected to other vehicle body structures through the relief holes 54. Furthermore, these relief holes 54 ensure that when the wheel hub bearing assembly is connected to the vehicle body, they are staggered with the second bosses 22 to avoid interference. When the wheel turns, the space between the bearing outer ring 5 and the vehicle body is squeezed. The staggered relief holes 54 prevent damage to the second bosses 22, which could compromise the airtight structure of the rotary seal assembly.

[0089] For example, refer to Figures 1 to 3 The air inlet 51 may include a first section 511 extending radially and a second section 512 extending axially. The first section 511 may be connected to an air source, and the second section 512 may be connected to the second air passage 21. In this embodiment, the radially extending first section 511 of the air inlet 51 may be formed with an opening on one radial side of the bearing outer ring 5. This allows the wheel hub bearing assembly to be connected to an air source in the radial direction regardless of whether it is applied to any side of the vehicle body, thereby increasing the overall applicability of the device and facilitating manufacturing.

[0090] The third embodiment of the present disclosure provides a tire, including the hub bearing assembly provided by the second embodiment of the present disclosure. It can be understood that it has all the beneficial technical effects of the above-mentioned hub bearing assembly.

[0091] The fourth embodiment of the present disclosure provides a vehicle, including the tire provided by the third embodiment of the present disclosure. It can be understood that it also has all the beneficial technical effects of the above-mentioned tires.

[0092] The preferred embodiments of the present disclosure are described in detail above with reference to the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple variations can be made to the technical solutions of the present disclosure, and these simple variations all fall within the scope of protection of the present disclosure. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner unless there is any contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0093] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. A rotary seal assembly, characterized in that: include: The rotating ring is provided with a first airway; a fixed ring, coaxially arranged opposite to the rotating ring and having a second air passage; as well as a sealing member, comprising an inner sealing ring and an outer sealing ring disposed between the rotating ring and the stationary ring, wherein the outer sealing ring is located radially outward of the inner sealing ring; The rotating ring, the fixed ring, the inner sealing ring and the outer sealing ring together form an air cavity, and the first air channel and the second air channel are connected through the air cavity.

2. The rotary seal assembly according to claim 1, wherein: The inner seal ring includes a first skeleton fixed to one of the stationary ring and the rotating ring, and a first seal lip capable of rotating frictionally with the other.

3. The rotary seal assembly according to claim 2, wherein: The outer seal ring includes a second skeleton fixed to one of the fixed ring and the rotating ring and a second seal lip capable of rotating frictionally with the other.

4. The rotary seal assembly according to claim 3, wherein: The first sealing lip and the second sealing lip are respectively multi-lip structures.

5. The rotary seal assembly according to claim 3, wherein: The first frame and the second frame are respectively made of metal materials, and the first sealing lip and the second sealing lip are configured as non-metallic flexible materials.

6. The rotary seal assembly according to claim 3, wherein: The first skeleton is fixedly connected to the inner ring of the fixed ring, and the first sealing lip abuts against the radial inner side of the rotating ring and can rotate and rub against the rotating ring.

7. The rotary seal assembly according to claim 6, wherein: The first sealing lip is an annular structure. The inner sealing ring further comprises an inner tension ring, which is coaxially arranged on the inner side of the first sealing lip and has a tensioning force for pressing the first sealing lip against the inner ring of the rotating ring.

8. The rotary seal assembly according to claim 6 or 7, characterized in that: The second skeleton is fixedly connected to the outer ring of the fixed ring, and the second sealing lip abuts against the radial outer side of the fixed ring and rotates and rubs with the rotating ring.

9. The rotary seal assembly according to claim 8, wherein: The second sealing lip is an annular structure. The outer sealing ring further includes an outer tension ring, which is coaxially arranged on the outer ring of the second sealing lip and has a contraction force to press the second sealing lip to the outer ring of the rotating ring.

10. The rotary seal assembly according to claim 8, wherein: The first sealing lip has a plurality of first lips abutting against the rotating ring; the second sealing lip has a plurality of second lips abutting against the rotating ring, and the number of the second lips is greater than the number of the first lips.

11. The rotary seal assembly according to claim 3, wherein: An inner annular groove is formed on the end surface of the fixed ring facing the rotating ring. A first sealing ring is arranged in the inner annular groove. The first sealing ring is tightly pressed against the first frame.

12. The rotary seal assembly according to claim 11, wherein: An outer annular groove is formed on the end surface of the fixed ring facing the rotating ring. A second sealing ring is arranged in the outer annular groove. The second sealing ring is pressed tightly against the second frame.

13. The rotary seal assembly according to claim 3, wherein: The first skeleton is fixedly connected to the inner ring of the rotating ring, and the first sealing lip abuts against the radial inner side of the fixing ring and can rotate and rub against the fixing ring.

14. The rotary seal assembly according to claim 13, wherein: The second skeleton is fixedly connected to the outer ring of the rotating ring, and the second sealing lip abuts against the radial outer side of the fixing ring and can rotate and rub against the fixing ring.

15. The rotary seal assembly according to claim 14, wherein: A step portion is formed on one end of the rotating ring facing the fixed ring. The first skeleton is fitted on the radial inner wall of the step portion, and the second skeleton is fitted on the radial outer wall of the step portion.

16. The rotary seal assembly according to claim 15, wherein: A first washer is provided between the first frame and the step portion, and a second washer is provided between the second frame and the step portion.

17. The rotary seal assembly according to claim 15, wherein: The end of the fixed ring facing the rotating ring has an axial recess capable of avoiding the step portion, and the step portion is at least partially accommodated in the axial recess. The first sealing lip and the second sealing lip can respectively rotatably rub against the inner wall of the axial recess.

18. The rotary seal assembly according to claim 17, wherein: The inner wall of the axial recess includes a bottom wall and two side walls, and the first sealing lip has at least two lip edges and abuts against at least the bottom wall and one of the side walls; The second sealing lip has at least two lip edges and abuts against at least the bottom wall and one of the side walls.

19. The rotary seal assembly according to claim 1, wherein: One end of the rotating ring facing the stationary ring is formed as a radially inwardly contracted step portion, and the inner sealing ring and the outer sealing ring are disposed on the step portion.

20. The rotary seal assembly of claim 1, wherein: The first air channel and the second air channel extend parallel to the axis of the rotating ring, respectively.

21. The rotary seal assembly according to claim 1, wherein: An annular groove is formed at one end of the rotating ring close to the fixed ring, and the first air passage is communicated with the annular groove.

22. The rotary seal assembly of claim 20, wherein: A step-shaped structure having a large diameter portion and a small diameter portion is formed in the first air passage. The small diameter portion is formed as a threaded section, and the threaded section is connected to the annular groove.

23. The rotary seal assembly of claim 1, wherein: One end of the second air channel close to the first air channel is formed into a gradually expanding trumpet-shaped structure.

24. A wheel hub bearing assembly, characterized in that: include: The wheel hub bearing comprises a flange and a bearing outer ring which can rotate relative to each other; and The rotary seal assembly according to any one of claims 1 to 23, The flange is provided with an air outlet communicated with the first air passage, and the bearing outer ring is provided with an air inlet communicated with the second air passage.

25. The wheel hub bearing assembly according to claim 24, characterized in that: A plurality of first bosses are provided on one side of the rotating ring facing the flange. The first bosses are used to be connected to the flange, and the first air channel is formed in one of the first bosses.

26. The wheel hub bearing assembly according to claim 25, characterized in that: A plurality of mounting bosses are provided on a side of the flange facing the rotating ring, and the mounting bosses are axially butted against the first bosses.

27. The wheel hub bearing assembly according to claim 24, characterized in that: The bearing outer ring has a flange, and the fixed ring is axially butt-jointed to the flange; the rotating ring is axially butt-jointed to the flange.

28. The wheel hub bearing assembly according to claim 27, characterized in that: A plurality of second bosses are provided on one side of the fixing ring facing the flange. Blind holes are formed on the second bosses, and a plurality of docking holes corresponding to the blind holes are formed on the flange.

29. The wheel hub bearing assembly according to claim 27, characterized in that: A recessed groove is provided at the butt joint position of the flange and the fixing ring. A third sealing ring is provided in the recessed groove. The third sealing ring surrounds the second air passage and the air inlet.

30. The wheel hub bearing assembly according to claim 27, wherein: A plurality of countersunk holes are further provided on one side of the fixing ring facing the flange, and the plurality of countersunk holes are staggered with the plurality of second bosses; The flange is provided with a plurality of avoidance holes, and the positions of the plurality of avoidance holes correspond to the positions of the plurality of countersunk holes.

31. The wheel hub bearing assembly according to claim 24, characterized in that: The air inlet includes a first section extending in a radial direction and a second section extending in an axial direction. The first section is used to connect to an air source, and the second section is used to connect to the second air channel.

32. A tire, characterized in that: A wheel hub bearing assembly comprising any one of claims 24-31.

33. A vehicle, characterized in that: Including the tire of claim 32.

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