Sealing structure for hub reduction gear box and hub reduction gear box

Abstract

The sealing structure comprises a shell, a first through shaft hole is formed in the shell, a first inlet and a first outlet are formed in the positions, at the two ends of the shell, of the first shaft hole respectively, the shell further comprises a first positioning ring protruding towards the radial outer side of the first shaft hole, and a second positioning ring protruding towards the radial outer side of the first shaft hole is formed in the shell; the first positioning ring is provided with a sealing face facing one side of the first outlet and a first inclined face deviating from the first outlet, and the first inclined face inclines towards the first outlet. The static ring is provided with a through second shaft hole, the second shaft hole and the first shaft hole are concentric, and a second positioning ring protruding outwards in the radial direction of the second shaft hole is arranged on the static ring; the locking assembly comprises a concave locking strip arranged on the outer side of the first positioning ring in a surrounding mode, a positioning recess is formed in the concave locking strip and comprises a first positioning face and a second positioning face which are oppositely arranged, the first positioning face is connected with the first inclined face of the first positioning ring in an abutting mode, and the second positioning face is connected with the second positioning ring in an abutting mode.

Description

Technical Field

[0001] This disclosure generally relates to the field of speed reducer technology. More specifically, this disclosure relates to a sealing structure for a wheel-side speed reducer gearbox and the wheel-side speed reducer gearbox itself. Background Technology

[0002] In the mining industry, heavy-duty vehicles used for transportation operations in open-pit mines typically rely on wheel-side reducers for their driving and deceleration functions. As a housing structure with an integrated gear transmission system, the wheel-side reducer requires lubricating oil to ensure the long-term service life of its core components such as gears and bearings, and to prevent equipment failure due to component wear. Simultaneously, because some areas of the wheel-side reducer experience relative movement during operation, dynamic sealing requirements must be met to prevent lubricating oil leakage or external impurities from affecting the normal operation of the transmission system. Existing technologies typically achieve this dynamic sealing by using mounting seats for fixed oil seals. However, the sealing structures in existing technologies are prone to failure under vibration, resulting in unstable sealing performance.

[0003] In view of this, there is an urgent need to provide a sealing structure for wheel-side reducer gearboxes and a wheel-side reducer gearbox in order to improve the stability of the sealing effect. Summary of the Invention

[0004] In order to at least solve one or more of the technical problems mentioned above, this disclosure proposes a sealing structure for a wheel-side reducer gearbox and a wheel-side reducer gearbox in several aspects.

[0005] In a first aspect, this disclosure provides a sealing structure for a wheel-side reducer gearbox, comprising: a housing having a through first shaft hole, the first shaft hole forming a first inlet and a first outlet at both ends of the housing, the housing further comprising a first positioning ring protruding radially outward toward the first shaft hole, the first positioning ring having a sealing surface toward the first outlet side and a first inclined surface away from the first outlet, the first inclined surface being inclined toward the first outlet; a stationary ring having a through second shaft hole, the second shaft hole being concentrically arranged with the first shaft hole, the stationary ring having a second positioning ring protruding radially outward along the second shaft hole; and a locking assembly comprising a concave locking strip surrounding the outside of the first positioning ring, the concave locking strip having a positioning recess, the positioning recess comprising a first positioning surface and a second positioning surface disposed opposite to each other, the first positioning surface abutting against the first inclined surface of the first positioning ring, and the second positioning surface abutting against the second positioning ring.

[0006] In some embodiments, the second shaft hole forms a second inlet and a second outlet at both ends of the stationary ring, and the side of the second positioning ring away from the second inlet also includes a second inclined surface that is inclined toward the second inlet, and the second positioning surface abuts against the second inclined surface.

[0007] In some embodiments, the first positioning surface and the first inclined surface have the same tilt angle, and the second positioning surface and the second inclined surface have the same tilt angle.

[0008] In some embodiments, the locking assembly further includes a locking member connected to the concave locking strip and capable of tightening the concave locking strip.

[0009] In some embodiments, the locking assembly includes a plurality of locking members and a plurality of concave locking strips, the plurality of concave locking strips being sequentially connected to the plurality of locking assemblies.

[0010] In some embodiments, the locking member includes a first locking part, a second locking part, and a locking connection part. The first locking part is disposed at one end of the concave locking strip, the second locking part is disposed at the other end of the concave locking strip, and the locking connection part is limitedly connected to the first locking part and simultaneously threadedly connected to the second locking part.

[0011] In some embodiments, a rotating ring is further included, which is concentrically arranged with the second shaft hole, and a first labyrinth seal is provided at the second outlet of the stationary ring, and a second labyrinth seal is provided on the side of the rotating ring facing the stationary ring, which cooperates with the first labyrinth seal.

[0012] In some embodiments, a dustproof ring is further provided between the first labyrinth sealing ring and the second labyrinth sealing ring.

[0013] In some embodiments, a dynamic seal is further provided on the inner side of the stationary ring, the dynamic seal including a dynamic sealing ring, the radial inner side of the dynamic sealing ring abutting against the rotating ring.

[0014] In a second aspect, this disclosure provides a wheel-side reducer gearbox, including a sealing structure for the wheel-side reducer gearbox according to the first aspect and several embodiments.

[0015] The sealing structure for the wheel-side reducer gearbox provided above, by setting a housing, a stationary ring, and a locking assembly, and setting a first positioning ring and a second positioning ring on the housing and the stationary ring respectively, wherein the first positioning ring includes an inclined first inclined surface, and the locking assembly includes a first positioning surface that abuts against the first inclined surface and a second positioning surface that abuts against the second positioning ring, can lock and seal the housing and the stationary ring with a simple fixing structure, thereby improving the sealing stability of the sealing structure of the wheel-side reducer gearbox. Attached Figure Description

[0016] The above and other objects, features, and advantages of exemplary embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. In the drawings, several embodiments of this disclosure are illustrated by way of example and not limitation, and like or corresponding reference numerals denote like or corresponding parts, wherein: Figure 1 An exemplary perspective view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown; Figure 2 An exemplary exploded view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown; Figure 3 It shows Figure 2 A magnified view of part A in the middle; Figure 4 An exemplary cross-sectional view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown; Figure 5 An exemplary partial cross-sectional view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown; Figure 6 An exemplary partial cross-sectional view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown; Figure 7 An exemplary side view of a wheel-side reducer gearbox according to some embodiments of this disclosure is shown. Detailed Implementation

[0017] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, not all of them. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0018] It should be understood that the terms “comprising” and “including” used in this disclosure and claims indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0019] It should also be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure. As used in this disclosure and claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in this disclosure and claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes such combinations.

[0020] As used in this specification and claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if [described condition or event] is detected" may be interpreted, depending on the context, as "once determined," "in response to determination," "once [described condition or event] is detected," or "in response to detection of [described condition or event]."

[0021] This disclosure provides a sealing structure for a wheel-side reducer gearbox. It comprises a housing, a stationary ring, and a locking assembly. A first positioning ring and a second positioning ring are respectively provided on the housing and the stationary ring. The first positioning ring includes an inclined first surface, while the locking assembly includes a first positioning surface that abuts against the first inclined surface and a second positioning surface that abuts against the second positioning ring. This simple fixing structure can lock and seal the housing and the stationary ring, improving the sealing stability of the wheel-side reducer gearbox.

[0022] The specific embodiments disclosed herein will now be described in detail with reference to the accompanying drawings.

[0023] See Figures 1 to 4 , Figure 1 An exemplary perspective view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown. Figure 2 An exemplary exploded view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown. Figure 3 An exemplary partial enlarged view is shown of a locking assembly of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure. Figure 4 An exemplary cross-sectional view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown.

[0024] In this embodiment, the sealing structure for the wheel-side reducer gearbox includes a hollow housing 10, a stationary ring 20 axially connected to the housing 10, and a locking assembly 30 for locking the stationary ring 20 relative to the housing 10. The housing 10 has a through first shaft hole 11, which forms a first inlet 111 and a first outlet 112 at both ends of the housing 10. The housing 10 also includes a first positioning ring 12 protruding radially outward toward the first shaft hole 11. The first positioning ring 12 has a sealing surface facing the first outlet 112 and a first inclined surface 121 facing away from the first outlet 112, which is inclined toward the first outlet 112. The stationary ring 20 has a through second shaft hole 21, which is concentrically arranged with the first shaft hole 11. A second positioning ring 22 protruding radially outward along the second shaft hole 21 is provided on the stationary ring 20. The locking assembly 30 includes a concave locking strip 31 surrounding the outside of the first positioning ring 12, and the concave locking strip 31 is provided with a positioning recess 310. The positioning recess 310 includes a first positioning surface 311 and a second positioning surface 312 disposed opposite to each other. The first positioning surface 311 abuts against the first inclined surface 121 of the first positioning ring 12, and the second positioning surface 312 abuts against the second positioning ring 22.

[0025] Specifically, the housing 10 may be made of a high-strength hard material such as cast iron, and its interior is provided with a first shaft hole 11 for accommodating the spindle and bearings or other related accessories connected to the spindle. The first shaft hole 11 passes through the housing 10 and forms a first inlet 111 and a first outlet 112 at its two ends, respectively. The first positioning ring 12 is configured to be concentric with the first shaft hole 11. The first positioning ring 12 protrudes radially outward relative to the outer side of the housing 10. The first positioning ring 12 is located on the side close to the first outlet 112, and its axial side away from the first outlet 112 is formed as a first inclined surface 121. The first inclined surface 121 is inclined axially from the first inlet 111 side toward the first outlet 112 side.

[0026] The stationary ring 20 is an annular structural member axially disposed on one side of the housing 10 along the first shaft hole 11, with the second shaft hole 21 penetrating its interior. A second positioning ring 22 protruding outward is disposed on the circumferential outer side of the second shaft hole 21. The stationary ring 20 is adjacent to the housing 10, and when the two are adjacent, the second shaft hole 21 and the first shaft hole 11 are concentric, the first positioning ring 12 and the second positioning ring 22 abut against each other, and the first inclined surface 121 is located on the side away from the second positioning ring 22.

[0027] The locking assembly 30 includes a concave locking strip 31, with a positioning recess 310 disposed on one side of the concave locking strip 31. The concave locking strip 31 can be made of a hard material such as stainless steel. While the first positioning ring 12 and the second positioning ring 22 abut against each other, the concave locking strip 31 surrounds the radially outer side of the first positioning ring 12 and the second positioning ring 22. The first positioning surface 311 within the positioning recess 310 abuts against the first inclined surface 121, while the second positioning surface 312 abuts against the second positioning ring 22. At this time, the concave locking strip 31 can be locked at the first positioning ring 12 and the second positioning ring 22 by its own structural strength or other locking components 32 connected to it.

[0028] Therefore, the positioning recess 310 of the concave locking strip 31 locks the first positioning ring 12 and the second positioning ring 22 relative to each other by abutting. Since the first inclined surface 121 is inclined towards the first outlet 112, when the first positioning surface 311 in the positioning recess 310 abuts against the first inclined surface 121, the locking force in the radial direction is transformed into a pushing force in the axial direction towards the second positioning ring 22 by abutting against the first inclined surface 121, thereby tightening the first positioning ring 12 relative to the second positioning ring 22 and improving the sealing effect. Furthermore, by locking the first positioning ring 12 and the second positioning ring 22 through the abutting of the positioning recess 310 of the locking assembly 30, the relative movement of the housing 10 and the stationary ring 20 under vibration and impact can be transmitted to the concave locking strip 31 and buffered, thereby improving the sealing stability of the sealing structure under impact. In addition, by adjusting the length of the concave locking strip 31, it can be easily adapted to the sealing of large-diameter spindle gearboxes.

[0029] Furthermore, the end faces of the first positioning ring 12 and the second positioning ring 22 that abut against each other can be designed to fit tightly together to increase the contact area of ​​the sealing surfaces. A sealing groove and a sealing ring 26 disposed within the sealing groove are also provided on the second positioning ring 22. The sealing groove and the sealing ring 26 are arranged around the second shaft hole 21 so that when the first positioning ring 12 and the second positioning ring 22 abut against each other, the sealing ring 26 abuts against the sealing surface of the first positioning ring 12, thereby further increasing the sealing effect.

[0030] Further or optionally, the second shaft hole 21 forms a second inlet 211 and a second outlet 212 at each end of the stationary ring 20. The side of the second positioning ring 22 away from the second inlet 211 also includes a second inclined surface 221 inclined towards the second inlet 211, and the second positioning surface 312 abuts against the second inclined surface 221. Specifically, the end face of the second positioning ring 22 near the second inlet 211 is used to abut against the sealing surface of the first positioning ring 12. The side of the second positioning ring 22 away from the second inlet 211 is provided with the second inclined surface 221, and the inclination angle of the second inclined surface 221 is opposite to that of the first inclined surface 121, that is, the second inclined surface 221 is inclined along the axial direction of the second shaft hole 21 from the second outlet 212 side towards the second inlet 211 side. When the first positioning ring 12 and the second positioning ring 22 abut against each other and are locked by the locking assembly 30, the second inclined surface 221 abuts against the second positioning surface 312. Therefore, when the locking assembly 30 locks the first positioning ring 12 and the second positioning ring 22, the positioning recess 310 simultaneously contacts the two inclined surfaces that are inclined relative to each other. The axial locking force generated by the radial locking force simultaneously pushes the first positioning ring 12 and the second positioning ring 22 against each other, thereby further improving the sealing effect.

[0031] In this embodiment, the first positioning surface 311 and the first inclined surface 121 have the same inclination angle, and the second positioning surface 312 and the second inclined surface 221 have the same inclination angle. Therefore, when the positioning recess 310 is locked relative to the first positioning ring 12 and the second positioning ring 22, the first positioning surface 311 and the second positioning surface 312 are in close contact with the first and second inclined surfaces. This increases the stability of the locking force acting on the first and second inclined surfaces by increasing the contact area, and further improves the sealing performance by increasing the sealing area, thereby reducing the possibility of lubricating oil leakage from the gap between the first positioning ring 12 and the second positioning ring 22.

[0032] In addition, see Figure 6 , Figure 6 An exemplary partial cross-sectional view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown. Those skilled in the art will understand that although a scheme for configuring the first positioning surface 311 and the second positioning surface 312 as inclined surfaces that conform to the first inclined surface 121 and the second inclined surface 221 has been described above, this disclosure does not limit the specific shape of the first positioning surface 311 and the second positioning surface 312. For example, in Figure 6In the illustrated embodiment, the second positioning surface 312 and the side of the second positioning ring 22 facing away from the second inlet 211 are both configured as planes perpendicular to the axis of the second shaft hole 21. When the first positioning ring 12 and the second positioning ring 22 are locked by means of the locking assembly 30, the radial locking force can be converted into axial sealing pressure simply by the abutment between the first positioning surface 311 and the second positioning surface 312. In some embodiments not shown, the first positioning surface 311 or the second positioning surface 312 may also be formed in other shapes such as arcs to form a tighter fit with the second positioning ring 22, thereby improving the connection strength or sealing effect.

[0033] See you again Figure 2 and Figure 3 In this embodiment, the locking assembly 30 further includes a locking member 32, which is connected to the concave locking strip 31 and can tighten the concave locking strip 31. Both ends of the locking assembly 30 can be connected to the concave locking strip 31 to form a locking ring around the first positioning ring 12 and the second positioning ring 22, thereby tightening the concave locking strip 31 by tightening the locking ring. The locking assembly 30 includes multiple locking members 32 and multiple concave locking strips 31, with the multiple concave locking strips 31 sequentially connected to the multiple locking assemblies 30. For example, as... Figure 2 In the illustrated embodiment, the locking assembly 30 includes two locking members 32 and two concave locking strips 31. Both ends of each concave locking strip 31 are connected to the two locking assemblies 30. Thus, the two locking members 32 and the two concave locking strips 31 constitute a locking ring. The two locking members 32 can be positioned at different locations and can both be used to tighten the locking ring, making operation more convenient. Furthermore, by using multiple concave locking strips 31, the size of a single concave locking strip 31 can be reduced, thereby lowering its production cost.

[0034] Further or optionally, the locking member 32 includes a first locking part 321, a second locking part 322, and a locking connecting part 323. The first locking part 321 is disposed at one end of the concave locking strip 31, and the second locking part 322 is disposed at the other end of the concave locking strip 31. The locking connecting part 323 is limitedly connected to the first locking part 321 and simultaneously threadedly connected to the second locking part 322. The first locking part 321 can be configured as a connector that is fixedly connected to the first end of the concave locking strip 31 by welding or threaded connection, and the first locking part 321 also has a through hole. Similarly, the second locking part 322 can be configured as a connector that is fixedly connected to the second end of the concave locking strip 31 by welding or threaded connection, and the second locking part 322 also has a threaded hole, which is disposed opposite to the through hole of the first locking part 321. The locking connection part 323 can be set as a bolt. When locking, the bolt passes through the through hole of the first locking part 321 and is threadedly connected to the threaded hole. By further tightening the bolt, the distance between the first locking part 321 and the second locking part 322 is shortened, thereby tightening the locking ring.

[0035] See also Figure 2 , Figure 4 and Figure 5 , Figure 5 An exemplary partial cross-sectional view of a sealing structure for a wheel-side reducer gearbox according to some embodiments of this disclosure is shown. In this embodiment, a rotating ring 40 is also included, concentrically disposed with the second shaft hole 21. A first labyrinth seal 28 is provided at the second outlet 212 of the stationary ring 20, and a second labyrinth seal 42, which mates with the first labyrinth seal 28, is provided on the side of the rotating ring 40 facing the stationary ring 20. During operation of the sealing structure, the rotating ring 40 rotates relative to the housing 10 and the stationary ring 20, simultaneously sealing and protecting the rotating components inside. The rotating ring 40 is axially disposed on the side of the stationary ring 20 opposite to the housing 10 along the second shaft hole 21, while the first labyrinth seal 28 on the stationary ring 20 and the second labyrinth seal 42 on the rotating ring 40 abut against each other axially along the second shaft hole 21 to seal and protect the components radially inward of the stationary ring 20 and the rotating ring 40.

[0036] Further, or optionally, a dustproof ring 53 is provided between the first labyrinth seal ring 28 and the second labyrinth seal ring 42, and this dustproof ring is arranged around the second shaft hole 21. The dustproof ring is fixedly mounted on the first labyrinth seal ring 28 or the second labyrinth seal ring 42, and can rotate simultaneously with it, while simultaneously abutting against the relatively rotating first labyrinth seal ring 28 or the second labyrinth seal ring 42. By providing this dustproof ring 53, the sealing effect of the sealing device is further enhanced, reducing the probability of malfunctions caused by dust or debris entering the sealing device through the gap between the rotating ring 40 and the stationary ring 20.

[0037] In this embodiment, a dynamic seal 60 is also provided inside the stationary ring 20. The dynamic seal 60 includes a dynamic sealing ring 61, the radially inner side of which abuts against the rotating ring 40. This sealing ring forms a sealing protection arranged axially along the second shaft hole 21, thereby enhancing the sealing effect.

[0038] This disclosure provides a sealing structure for a wheel-side reducer gearbox. It comprises a housing, a stationary ring, and a locking assembly. A first positioning ring and a second positioning ring are respectively provided on the housing and the stationary ring. The first positioning ring includes an inclined first surface, while the locking assembly includes a first positioning surface abutting against the first inclined surface and a second positioning surface abutting against the second positioning ring. This simple fixing structure can lock and seal the housing and the stationary ring. This sealing structure is suitable for large-diameter flexible combined seals, effectively solving the dynamic sealing requirements of gearboxes under large impact deformation conditions, and improving the strength and sealing performance of the wheel-side reducer gearbox sealing structure.

[0039] See Figure 7 , Figure 7 An exemplary side view of a wheel-side reducer gearbox according to some embodiments of the present disclosure is shown. The wheel-side reducer gearbox 200 according to the present disclosure includes a sealing structure 100 for a wheel-side reducer gearbox according to several embodiments of the present disclosure, and a transmission assembly 90 connected to the sealing structure 100, the transmission assembly 90 including a gear set and bearing assemblies, etc., connected to the sealing structure 100.

[0040] While numerous embodiments of this disclosure have been shown and described herein, it will be apparent to those skilled in the art that such embodiments are provided by way of example only. Many modifications, alterations, and alternatives will occur to those skilled in the art without departing from the spirit and intent of this disclosure. It should be understood that various alternatives to the embodiments of this disclosure described herein may be employed in the practice of this disclosure. The appended claims are intended to define the scope of this disclosure and therefore cover equivalents or alternatives within the scope of these claims.

Claims

1. A sealing structure for a wheel-side reducer gearbox, characterized in that, include: The housing (10) has a through first shaft hole (11), the first shaft hole (11) forms a first inlet (111) and a first outlet (112) at both ends of the housing (10), the housing (10) further includes a first positioning ring (12) protruding radially outward toward the first shaft hole (11), the first positioning ring (12) has a sealing surface toward the first outlet (112) and a first inclined surface (121) away from the first outlet (112), the first inclined surface (121) being inclined toward the first outlet (112); A stationary ring (20) has a through second shaft hole (21) which is concentrically arranged with the first shaft hole (11). A second positioning ring (22) is provided on the stationary ring (20) that protrudes radially outward along the second shaft hole (21). The locking assembly (30) includes a concave locking strip (31) surrounding the outside of the first positioning ring (12). The concave locking strip (31) is provided with a positioning recess (310). The positioning recess (310) includes a first positioning surface (311) and a second positioning surface (312) disposed opposite to each other. The first positioning surface (311) abuts against the first inclined surface (121) of the first positioning ring (12), and the second positioning surface (312) abuts against the second positioning ring (22).

2. The sealing structure according to claim 1, characterized in that, The second shaft hole (21) forms a second inlet (211) and a second outlet (212) at both ends of the stationary ring (20). The second positioning ring (22) also includes a second inclined surface (221) on the side away from the second inlet (211) that is inclined toward the second inlet (211). The second positioning surface (312) abuts against the second inclined surface (221).

3. The sealing structure according to claim 2, characterized in that, The first positioning surface (311) has the same tilt angle as the first inclined surface (121), and the second positioning surface (312) has the same tilt angle as the second inclined surface (221).

4. The sealing structure according to claim 1, characterized in that, The locking assembly (30) further includes a locking member (32), which is connected to the concave locking strip (31) and is capable of tightening the concave locking strip (31).

5. The sealing structure according to claim 4, characterized in that, The locking assembly (30) includes a plurality of locking elements (32) and a plurality of concave locking strips (31), wherein the plurality of concave locking strips (31) are sequentially connected to the plurality of locking assemblies (30).

6. The sealing structure according to claim 4, characterized in that, The locking member (32) includes a first locking part (321), a second locking part (322), and a locking connection part (323). The first locking part (321) is disposed at one end of the concave locking strip (31), and the second locking part (322) is disposed at the other end of the concave locking strip (31). The locking connection part (323) is limitedly connected to the first locking part (321) and simultaneously threadedly connected to the second locking part (322).

7. The sealing structure according to claim 1, characterized in that, It also includes a rotating ring (40) which is concentrically arranged with the second shaft hole (21), and a first labyrinth seal ring (28) is provided at the second outlet (212) of the stationary ring (20), and a second labyrinth seal ring (42) that cooperates with the first labyrinth seal ring (28) is provided on the side of the rotating ring (40) facing the stationary ring (20).

8. The sealing structure according to claim 7, characterized in that, A dustproof ring (53) is also provided between the first labyrinth sealing ring (28) and the second labyrinth sealing ring (42).

9. The sealing structure according to claim 7, characterized in that, The inner side of the stationary ring (20) is also provided with a dynamic seal (60), which includes a dynamic sealing ring (61), and the radial inner side of the dynamic sealing ring (61) abuts against the rotating ring (40).

10. A wheel-side reducer gearbox, characterized in that, Includes a sealing structure for a wheel-side reducer gearbox according to any one of claims 1 to 9.

Images