Sealing structure, steering drive axle and vehicle

Abstract

The invention relates to the technical field of vehicle parts, and discloses a sealing structure, a steering drive axle and a vehicle, the sealing structure comprises: a housing provided with a mounting through hole; at least part of the structure of the half shaft is arranged in the mounting through hole in a penetrating manner, and the half shaft is movably connected with the shell; the oil seal is hermetically matched between the inner wall of the mounting through hole and the half shaft; the baffle ring is located on the outer side of the oil seal in the axial direction of the half shaft; the baffle ring is connected with the inner wall of the mounting through hole, and the half shaft penetrates through the baffle ring. According to the technical scheme, the baffle ring is arranged on the outer side of the oil seal, external dust, silt and other impurities can be blocked, the oil seal and the half shaft are protected, abrasion of the external impurities to the oil seal is reduced or even eliminated, the service life of the oil seal is prolonged, the problems that particles are prone to being attached to the half shaft, and foreign matter is prone to being wound are solved, and the service life of the half shaft is prolonged. And therefore, the sealing stability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle parts, and in particular to a sealing structure, a steering drive axle and a vehicle. Background Art

[0002] In the steering drive axle of a vehicle, the seal between the half shaft and the housing is crucial. However, the structural setting of the traditional sealing structure is unreasonable, resulting in poor sealing stability. For example, during the driving process of the vehicle, foreign impurities such as dust and sand can easily enter the connection between the half shaft and the housing, wear the oil seal between the half shaft and the housing, affect the sealing effect, and reduce the reliability and service life of the steering drive axle. Summary of the invention

[0003] In view of this, the present invention provides a sealing structure applied to a steering drive axle, a steering drive axle having the sealing structure and a vehicle, so as to solve the problem of poor sealing stability of the traditional sealing structure.

[0004] In the first aspect, the present invention provides a sealing structure, which is applied to a steering drive axle, comprising: a housing, provided with a mounting through hole; a half shaft, at least part of which is inserted into the mounting through hole and movably connected to the housing; an oil seal, which is sealed and fitted between the inner wall of the mounting through hole and the half shaft; a retaining ring, which is located on the outside of the oil seal along the axial direction of the half shaft; the retaining ring is connected to the inner wall of the mounting through hole, and the half shaft is inserted into the retaining ring. The technical solution of the present invention can block external dust, mud and other impurities by arranging a retaining ring on the outside of the oil seal, play a protective role for the oil seal and the half shaft, reduce or even eliminate the wear of the oil seal by external impurities, increase the service life of the oil seal, and solve the problems of easy adhesion of particles and entanglement of foreign objects on the half shaft, thereby improving the stability of the seal.

[0005] In an optional embodiment, the outer peripheral wall of the retaining ring is interference-fitted with the inner wall of the mounting through hole, and the installation is tight and not easy to loosen, further enhancing the stability of the entire sealing structure. In addition, the retaining ring is located outside the oil seal, and the interference fit between the retaining ring and the mounting through hole will not affect the mating surface between the oil seal and the mounting through hole, thereby avoiding damage to the oil seal mating surface and ensuring the reliability of the seal.

[0006] In an optional embodiment, a first gap is provided between the inner circumferential wall of the retaining ring and the outer circumferential wall of the half shaft. The first gap is 0.05-0.5 mm, which can effectively block larger hard particles, entangled foreign matter, etc., and improve the reliability of oil seal and half shaft protection.

[0007] In an optional embodiment, a second gap is provided between the oil seal and the retaining ring along the axial direction of the half shaft, so as to form a relatively clean cavity between the oil seal and the retaining ring. When the half shaft moves axially, the half shaft moves axially inside the relatively clean cavity, and its surface is not easy to adhere to hard particles, entangle foreign matter, etc., further reducing or even eliminating the wear caused by foreign matter during the relative movement between the half shaft and the oil seal, and improving the reliability of the sealing structure.

[0008] In an optional embodiment, the retaining ring is provided with a connecting portion penetrating along the axial direction, the connecting portion is located below the half shaft and is connected to the second gap. It should be noted that the connecting portion being located below the half shaft specifically refers to being located below the half shaft in the gravity direction, so that impurities such as mud and sand entering between the retaining ring and the oil seal can be discharged from the connecting portion under the action of gravity, preventing impurities from accumulating between the oil seal and the retaining ring and wearing key components such as the oil seal or the half shaft.

[0009] In an optional embodiment, the retaining ring includes a thin-walled portion and a thick-walled portion which are sequentially arranged and connected from the inside to the outside in the radial direction, and the connecting portion is a groove provided on the thick-walled portion. This structural design is reasonable, which not only ensures the structural strength of the retaining ring, but also ensures the sewage discharge function of the connecting portion.

[0010] In an optional embodiment, a rotating support is further included, and the rotating support is located on a side of the oil seal away from the retaining ring; the rotating support is connected to the inner wall of the mounting through hole and has a clearance fit with the outer peripheral wall of the half shaft. The rotating support can provide support for the half shaft to ensure the stability of the half shaft during rotation or compound motion.

[0011] In an optional embodiment, the installation through hole includes a first section, a second section and a third section arranged in sequence along the axial direction, the aperture of the first section is smaller than the aperture of the second section, and the aperture of the second section is smaller than the aperture of the third section; the rotating support is arranged in the first section, the oil seal is arranged in the second section, and the retaining ring is arranged in the third section. This segmented structural design facilitates the installation and positioning of each component, and is also conducive to improving the integrity of the sealing structure.

[0012] In a second aspect, the present invention also provides a steering drive axle, comprising: a sealing structure as described above; wherein the half-shaft is an outer half-shaft and the shell is a steering knuckle; and / or the half-shaft is an inner half-shaft and the shell is a bridge housing; the outer half-shaft and the inner half-shaft are rotatably connected.

[0013] The steering drive axle of the present invention adopts the above-mentioned sealing structure, which effectively improves the sealing performance of the steering drive axle, reduces the damage of impurities to the internal components of the steering drive axle, and improves the reliability and service life of the steering drive axle.

[0014] In a third aspect, the present invention further provides a vehicle, comprising: the sealing structure as described above; or, the steering drive axle as described above.

[0015] The vehicle of the present invention uses the above-mentioned sealing structure or rotating drive axle, and the reliability of the seal is optimized, the failure rate caused by problems such as sealing failure is reduced, and the overall quality of the vehicle and user experience are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 A partial cross-sectional view of a steering drive axle according to an embodiment of the present invention;

[0018] Figure 2 is a cross-sectional view of a sealing structure according to an embodiment of the present invention;

[0019] Figure 3 for Figure 2 A is a partial enlarged schematic diagram;

[0020] Figure 4 is a cross-sectional view of another sealing structure according to an embodiment of the present invention;

[0021] Figure 5 A three-dimensional diagram of a retaining ring according to an embodiment of the present invention;

[0022] Figure 6 The figure is a plan view of a retaining ring according to an embodiment of the present invention.

[0023] Description of reference numerals:

[0024] 1. Axle shaft; 11. Outer axle shaft; 12. Inner axle shaft; 2. Housing; 20. Mounting through hole; 201. First section; 202. Second section; 203. Third section; 21. Steering knuckle; 22. Bridge housing; 3. Rotating support; 4. Oil seal; 41. Frame; 42. First sealing ring; 43. Second sealing ring; 44. Third sealing ring; 5. Retaining ring; 51. Connecting part; 52. Thin-walled part; 53. Thick-walled part; 6. Universal joint; 7. Upper kingpin; 8. Upper kingpin bushing; 9. Lower kingpin; 10. Lower kingpin bearing. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0027] According to an embodiment of the present invention, on the one hand, a sealing structure applied to a steering drive axle is provided, which includes a housing 2, a half shaft 1 movably connected in the housing 2, and an oil seal 4 and a retaining ring 5 arranged between the housing 2 and the half shaft 1.

[0028] Specifically, Figure 1-Figure 4 As described above, the housing 2 is provided with a mounting through hole 20, and at least part of the structure of the half shaft 1 is passed through the mounting through hole 20 and is movably connected to the housing 2. The oil seal 4 is sleeved on the half shaft 1, and is sealed between the inner wall of the mounting through hole 20 and the half shaft 1, playing a major sealing role to prevent the entry of foreign impurities and the leakage of internal lubricating oil. The retaining ring 5 is located on the outside of the oil seal 4 along the axial direction of the half shaft 1, and the retaining ring 5 is connected to the inner wall of the mounting through hole 20. The half shaft 1 is passed through the retaining ring 5, and the retaining ring 5 can further block impurities and protect the oil seal 4.

[0029] It should be noted that Figure 1 , Figure 2 and Figure 4 In the figure, the axial direction of the half shaft 1 specifically refers to the up-down direction in the figure, and the radial direction of the half shaft 1 specifically refers to the left-right direction in the figure. Figure 3 In the figure, the axial direction of the half shaft 1 specifically refers to the left-right direction in the figure, and the radial direction of the half shaft 1 specifically refers to the up-down direction in the figure.

[0030] It can be understood that in this embodiment, the oil seal 4 and the retaining ring 5 are both annular structures, and are arranged between the inner wall of the mounting through hole 20 of the housing 2 and the outer peripheral wall of the half shaft 1 .

[0031] In this embodiment, by providing a retaining ring 5 on the outside of the oil seal 4, it is possible to block external impurities such as dust, mud and sand, thereby protecting the oil seal 4 and the half-shaft 1, reducing or even eliminating the wear of the oil seal 4 by external impurities, thereby increasing the service life of the oil seal 4, and solving the problems of particles easily adhering to the half-shaft 1 and entanglement with foreign objects, thereby improving the stability of the seal.

[0032] Furthermore, the movable connection mode between the half-shaft 1 and the shell 2 depends on the actual application requirements. For example, the half-shaft 1 can be rotatably connected to the shell 2 around its own axis, that is, the half-shaft 1 can perform rotational motion; for example, the half-shaft 1 can also be rotatably connected to the shell 2 around its own axis and axially movably connected to the shell 2, that is, the half-shaft 1 can perform a combined rotational and axial motion.

[0033] Furthermore, the half shaft 1 has a first end and a second end opposite to each other in the axial direction, wherein the first end is located outside the housing 2 and is used to be connected to the wheel shell by a flange or spline, or to be connected to the half shaft 1 gear of the differential by a spline; the second end is passed through the mounting through hole 20 and is movably connected to the housing 2. The retaining ring 5 located outside the oil seal 4 specifically refers to being located on the side of the oil seal 4 close to the second end.

[0034] Exemplarily, the half shaft 1 can be an outer half shaft 11, the first end of the outer half shaft 11 is located outside the housing 2, and is drivingly connected to the wheel shell through a flange or a spline, etc., the second end of the outer half shaft 11 is inserted into the mounting through hole 20 of the housing 2, and is rotationally connected to the inner half shaft 12 through a universal joint 6. Exemplarily, the half shaft 1 can be an inner half shaft 12, the first end of the inner half shaft 12 is located outside the housing 2, and is drivingly connected to the half shaft 1 of the differential through a spline, etc., the second end of the outer half shaft 11 is inserted into the mounting through hole 20 of the housing 2, and is rotationally connected to the outer half shaft 11 through a universal joint 6.

[0035] More specifically, in some embodiments, the outer peripheral wall of the retaining ring 5 is interference-fitted with the inner wall of the mounting through hole 20 to fix the retaining ring 5 in the mounting through hole 20, so that the mounting is tight and not easy to loosen, further enhancing the stability of the entire sealing structure. In addition, the retaining ring 5 is located outside the oil seal 4, and the interference fit between the retaining ring 5 and the mounting through hole 20 will not affect the mating surface between the oil seal 4 and the mounting through hole 20, thereby avoiding damage to the mating surface of the oil seal 4 and ensuring the reliability of the seal.

[0036] Furthermore, the inner diameter of the retaining ring 5 is slightly larger than the outer diameter of the half shaft 1 matched therewith, so as to form a small gap between the two. Specifically, along the radial direction, a first gap is provided between the inner peripheral wall of the retaining ring 5 and the outer peripheral wall of the half shaft 1, and the first gap may be 0.05-0.5 mm, which can effectively block larger hard particles, entangled foreign matter, etc., and improve the reliability of the protection of the oil seal 4 and the half shaft 1.

[0037] In some embodiments, a second gap is provided between the oil seal 4 and the retaining ring 5 along the axial direction of the half shaft 1. Figure 3As shown, specifically, a second gap is provided between the end face of the oil seal 4 close to the retaining ring 5 and the end face of the retaining ring 5 close to the oil seal 4 along the axial direction, so as to form a relatively clean cavity between the oil seal 4 and the retaining ring 5. When the half shaft 1 moves axially, the half shaft 1 moves axially inside the relatively clean cavity, and its surface is not easy to adhere to hard particles, entangle foreign matter, etc., further reducing or even eliminating the wear caused by foreign matter during the relative movement between the half shaft 1 and the oil seal 4, and improving the reliability of the sealing structure.

[0038] Furthermore, the size of the second gap is greater than or equal to the axial movement of the half shaft 1. The size of the second gap specifically refers to Figure 3 The S in the figure refers to the total displacement of the half shaft 1 along the axial direction during operation.

[0039] In some embodiments, the axial movement of the half shaft 1 is 1-10 mm, preferably 4-6 mm. Exemplarily, the axial movement of the half shaft 1 can be 5 mm. In this case, in the sealing structure, the size of the second gap is greater than or equal to 5 mm. In this embodiment, the size of the second gap is greater than or equal to the axial movement of the half shaft 1, which can ensure that the half shaft 1 can still be well protected when there is a certain amount of movement.

[0040] It can be understood that in some cases, the half shaft 1 only performs rotational motion, that is, the axis movement thereof is zero, and at this time, the second gap S can be greater than or equal to zero.

[0041] In some embodiments, the retaining ring 5 is provided with a connecting portion 51 that penetrates in the axial direction. The connecting portion 51 is located below the half shaft 1 and is connected to the second gap. It should be noted that the connecting portion 51 being located below the half shaft 1 specifically refers to being located below the half shaft 1 in the gravity direction. In this way, impurities such as mud and sand that enter between the retaining ring 5 and the oil seal 4 can be discharged from the connecting portion 51 under the action of gravity, that is, according to the following example: Figure 2 and Figure 4 The oil is discharged in the direction shown by route B in the middle to prevent impurities from accumulating between the oil seal 4 and the retaining ring 5 and wearing key components such as the oil seal 4 or the half shaft 1.

[0042] Specifically, in some embodiments, as Figure 6 As shown, the maximum spacing between the connecting portion 51 and the axis of the retaining ring 5 is L1, and the minimum spacing is L2. Among them, the minimum spacing L2 between the connecting portion 51 and the axis of the retaining ring 5 can be greater than the radius of the inner circumference of the oil seal 4, and less than the radius of the outer circumference of the oil seal 4, so as to ensure that the connecting portion 51 is connected to the second gap. The maximum spacing L1 between the connecting portion 51 and the axis of the retaining ring 5 can be greater than the radius of the outer circumference of the oil seal 4, so as to increase the size of the connecting portion 51 and enhance the sewage discharge capacity.

[0043] In some embodiments, Figure 6As shown, the width of the retaining ring 5 in its circumferential direction is W, and W can be 1-5 mm, which can ensure the effective discharge of dirt without affecting the dustproof function of the retaining ring 5.

[0044] Furthermore, in some embodiments, Figure 5 and Figure 6 As shown, the retaining ring 5 includes a thin-walled portion 52 and a thick-walled portion 53 which are sequentially arranged and connected from the inside to the outside in the radial direction. Among them, at the end close to the oil seal 4, the end surface of the thin-walled portion 52 is parallel to the end surface of the thick-walled portion 53; at the end far from the oil seal 4, the end surface of the thin-walled portion 52 is recessed in the end surface of the thick-walled portion 53 to avoid interference with the second end of the half shaft 1.

[0045] Furthermore, the connecting portion 51 may be a groove formed on the thick wall portion 53. Arranging the connecting portion 51 on the thin wall portion 52 ensures both the structural strength of the retaining ring 5 and the sewage discharge function of the connecting portion 51. Arranging the connecting portion 51 as a groove is simple in structure and easy to manufacture.

[0046] Exemplarily, the groove may be a U-shaped groove, a right-angle groove, a V-shaped groove, a trapezoidal groove, or the like.

[0047] Further, in some embodiments, the oil seal 4 may include a skeleton 41 and a first sealing ring 42, a second sealing ring 43 and a third sealing ring 44 disposed in the skeleton 41, wherein the first sealing ring 42, the second sealing ring 43 and the third sealing ring 44 are disposed in sequence along the axial direction. The outer peripheral wall of the skeleton 41 may be interference fit with the inner wall of the mounting through hole 20, such as being installed in the mounting through hole 20 by a press-fitting process. The sealing lips of the first sealing ring 42, the second sealing ring 43 and the third sealing ring 44 are tightly fitted with the outer peripheral wall of the half shaft 1.

[0048] It is understandable that the oil seal 4 may also adopt other structures. The present invention does not specifically limit the structure of the oil seal 4 as long as it can perform the corresponding sealing function.

[0049] In some embodiments, the sealing structure further includes a rotating support member 3, which is located on a side of the oil seal 4 away from the retaining ring 5. The rotating support member 3 is connected to the inner wall of the mounting through hole 20 and is clearance-matched with the outer peripheral wall of the half-shaft 1. The rotating support member 3 can provide support for the half-shaft 1 to ensure the stability of the half-shaft 1 during rotation or compound motion.

[0050] Exemplarily, the rotation support member 3 may be a bushing, a bearing (such as a needle bearing), etc. Exemplarily, the outer peripheral wall of the rotation support member 3 may be interference fit with the inner wall of the installation through hole 20, such as being installed in the installation through hole 20 by a press-fitting process.

[0051] It can be understood that the rotating support 3 is sleeved on the side of the half shaft 1 away from the second end, that is, away from the retaining ring 5 , and along the axial direction of the half shaft 1 , the oil seal 4 is located between the rotating support 3 and the retaining ring 5 .

[0052] In some embodiments, Figure 3 As shown, the mounting through hole 20 includes a first section 201, a second section 202 and a third section 203 which are sequentially arranged along the axial direction, the aperture of the first section 201 is smaller than the aperture of the second section 202, and the aperture of the second section 202 is smaller than the aperture of the third section 203. The rotating support member 3 is arranged in the first section 201, the oil seal 4 is arranged in the second section 202, and the retaining ring 5 is arranged in the third section 203. The segmented structural design is adopted in this embodiment, which is convenient for the installation and positioning of each component, and is also conducive to improving the integrity of the sealing structure.

[0053] Furthermore, a chamfer may be provided at the connection between the second section 202 and the third section 203 so as to guide dirt such as mud and sand between the oil seal 4 and the retaining ring 5 to the connecting portion 51 of the retaining ring 5, thereby improving the sewage discharge effect.

[0054] The sealing structure of the present invention solves the problems of poor protection of the oil seal 4, easy adhesion of particles to the half-shaft 1, and foreign matter entangled in the shaft, and can automatically discharge invading impurities, and plays a good protective role for the seal that cooperates with the half-shaft 1 that rotates or performs a combined rotation and axial movement, thereby increasing the service life of the oil seal 4 and being suitable for steering drive axles and vehicles with a relatively large amount of mud and sand in the working environment.

[0055] According to an embodiment of the present invention, on the other hand, a steering drive axle is provided, comprising the above-mentioned sealing structure. The half shaft 1 in the sealing structure may be an outer half shaft 11, and the housing 2 may be a steering knuckle 21; and / or the half shaft 1 may be an inner half shaft 12, and the housing 2 may be an axle housing 22. The outer half shaft 11 is rotatably connected to the inner half shaft 12.

[0056] Specifically, Figure 1As shown, the steering drive axle includes a steering knuckle 21, a bridge housing 22, an outer half shaft 11, an inner half shaft 12, an upper kingpin 7, an upper kingpin bushing 8, a lower kingpin 9 and a lower kingpin bearing 10. The steering knuckle 21 is movably connected to the bridge housing 22 at the top through the upper kingpin 7 and the upper kingpin bushing 8, and is movably connected to the bottom through the lower kingpin 9 and the lower kingpin bearing 10. An installation space is formed between the steering knuckle 21 and the bridge housing 22, and the universal joint 6 is arranged in the installation space. The steering knuckle 21 and the bridge housing 22 are both provided with the above-mentioned installation through hole 20, and the installation through holes 20 of the two are connected with the installation space. The outer half shaft 11 is penetrated in the installation through hole 20 of the steering knuckle 21 and is rotatably connected with the universal joint 6. The above-mentioned rotating support 3, oil seal 4 and retaining ring 5 can be arranged between the inner wall of the outer half shaft 11 and the installation through hole 20 of the steering knuckle 21. The inner half shaft 12 is passed through the mounting hole 20 of the bridge housing 22 and is rotatably connected to the universal joint 6 . The above-mentioned rotating support 3 , oil seal 4 and retaining ring 5 may also be arranged between the inner half shaft 12 and the inner wall of the mounting hole 20 of the bridge housing 22 .

[0057] The steering drive axle of the present invention adopts the above-mentioned sealing structure, which effectively improves the sealing performance of the steering drive axle, reduces the damage of impurities to the internal components of the steering drive axle, and improves the reliability and service life of the steering drive axle.

[0058] According to an embodiment of the present invention, in another aspect, a vehicle is provided, comprising the above-mentioned sealing structure; or the above-mentioned steering drive axle. The vehicle of the present invention uses the above-mentioned sealing structure or the steering drive axle, the reliability of the seal is optimized, the failure rate caused by problems such as seal failure is reduced, and the overall quality of the vehicle and the user experience are improved.

[0059] It should be noted that the vehicles of the present invention include but are not limited to cars such as cars, off-road vehicles, trucks, engineering vehicles such as loaders, excavators, and rock drills, agricultural vehicles such as tractors and harvesters, and special vehicles such as ATVs, snowmobiles, and shuttle buses.

[0060] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A sealing structure, applied to a steering drive axle, characterized in that: include: The housing (2) is provided with a mounting through hole (20); A half shaft (1), at least part of which is inserted into the mounting through hole (20) and is movably connected to the housing (2); An oil seal (4) is sealingly fitted between the inner wall of the mounting through hole (20) and the half shaft (1); A retaining ring (5) is located on the outside of the oil seal (4) along the axial direction of the half shaft (1); the retaining ring (5) is connected to the inner wall of the mounting through hole (20), and the half shaft (1) is inserted into the retaining ring (5).

2. The sealing structure according to claim 1, characterized in that: The outer peripheral wall of the retaining ring (5) is interference-fitted with the inner wall of the mounting through hole (20).

3. The sealing structure according to claim 2, characterized in that: A first gap is provided between the inner peripheral wall of the retaining ring (5) and the outer peripheral wall of the half shaft (1), and the first gap is 0.05-0.5 mm.

4. The sealing structure according to claim 1, characterized in that: Along the axial direction of the half shaft (1), a second gap is provided between the oil seal (4) and the retaining ring (5).

5. The sealing structure according to claim 4, characterized in that: The retaining ring (5) is provided with a communicating portion (51) penetrating along the axial direction; the communicating portion (51) is located below the half shaft (1) and is in communication with the second gap.

6. The sealing structure according to claim 5, characterized in that: The retaining ring (5) comprises a thin-walled portion (52) and a thick-walled portion (53) which are sequentially arranged and connected from the inside to the outside in the radial direction, and the connecting portion (51) is a groove formed on the thick-walled portion (53).

7. The sealing structure according to any one of claims 1 to 6, characterized in that: It also includes a rotating support member (3), which is located on a side of the oil seal (4) away from the retaining ring (5); the rotating support member (3) is connected to the inner wall of the mounting through hole (20) and is clearance-matched with the outer peripheral wall of the half shaft (1).

8. The sealing structure according to claim 7, characterized in that: The mounting through hole (20) comprises a first section (201), a second section (202) and a third section (203) which are sequentially arranged along the axial direction, the aperture of the first section (201) is smaller than the aperture of the second section (202), and the aperture of the second section (202) is smaller than the aperture of the third section (203); The rotating support member (3) is arranged at the first section (201), the oil seal (4) is arranged at the second section (202), and the retaining ring (5) is arranged at the third section (203).

9. A steering drive axle, characterized in that: include: The sealing structure according to any one of claims 1 to 8; Wherein, the half shaft (1) is an outer half shaft (11), and the housing (2) is a steering knuckle (21); and / or, the half shaft (1) is an inner half shaft (12), and the housing (2) is a bridge housing (22); the outer half shaft (11) is rotatably connected to the inner half shaft (12).

10. A vehicle, characterized in that: include: The sealing structure according to any one of claims 1 to 8; Or, the steering drive axle as claimed in claim 9.

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