Floating seal and floating seal structure of main and final oil seal for steering drive axle

Abstract

The present invention discloses a floating seal and a main and final oil seal for a steering drive axle, comprising an annular base, wherein the annular base comprises: at least one inner circumferential ring located in the middle section of its inner annular wall and pointing radially inward, at least one outer circumferential ring located in the middle section of its outer annular wall and pointing radially outward, at least two inner sealing rings located on its inner annular wall, wherein the inner sealing rings are arranged on both sides of the inner circumferential ring; and at least two outer sealing rings located on its outer annular wall, wherein the outer sealing rings are arranged on both sides of the outer circumferential ring. The invention effectively solves the problem of oil leakage of the main and final oil seal in one paddy field operation season, and completes the user's desire and mission of not leaking oil in double-season rice for the main and final oil seal (floating seal). The structure can also be applied to similar structures of dynamic sealing of end faces on steering components and walking components of other machines.

Description

Technical Field

[0001] The invention belongs to the field of front axle manufacturing for paddy field tractors, and in particular relates to a floating seal component and a floating seal structure of a main and terminal oil seal for a steering drive axle. Background Art

[0002] In recent years, with the rapid development of paddy field tractors in my country, the country's quality requirements for mechanical products have become increasingly stringent. At the same time, when purchasing products, southern users also place special emphasis on whether the various performance indicators of the products meet national and industry standards. In particular, for the steering drive axle as the front axle of the paddy field tractor, key requirements are put forward: strong anti-mud and water sealing and good steering unit stability. Because the working environment of the rice field is harsh, more than half of the front wheel is immersed in the mud, the main and terminal parts are intermittently rotating, the linear speed is low, but the steering frequency is high, and the main and terminal oil seals are often rotated under partial load conditions. Due to the high ridges of the terraced fields, the potential risk of front wheel bumps is large, so the main and terminal oil seals of the steering drive axle have a high oil leakage failure rate.

[0003] In the prior art, there are two types of sealing structures for the main and terminal oil seals commonly used in steering drive axles: the first is a dustproof structure + a separate oil seal. The dustproof structure generally has a dust cover 10 and a shell forming a maze, or the oil seal assembly and the related shell form a maze to filter and resist external mud and sand; the separate oil seal includes two parts, one is the inner ring 20, which is fixed on the shaft 21 through a multi-channel corrugated design to ensure the stability and wear resistance of the sliding surface of the lip contact, and the other is the outer ring 40, which is fixed in the seat hole 41. After the assembly body, the lip shape 60 and the sealing lip 80 are reasonably and evenly pressed onto the sliding surface 70 of the inner ring 20, playing the role of dustproof and waterproof oil sealing. The second type is a cassette combination oil seal (not shown), which is an integral type, and the matching shaft does not need special processing, which is easy to install in the seat hole and has strong retention. The cassette combination oil seal rotates relatively inside, and the multi-channel dustproof lip has high performance in resisting the intrusion of pollutants. The sealing lip is equipped with a spring, and has good mud and water resistance and oil sealing performance. The paddy field working conditions in the past two years have proved that the first sealing structure is more complicated and uses more parts. When assembling, the lip shape is easy to turn over when the inner and outer rings are combined. When the front wheel bumps, the contact between the lip and the sliding surface is poor, and the sealing performance is not easy to ensure. The sealing lip 80 is also sealed by the clamping force generated by the spring 90. Under intermittent rotation and eccentric load conditions, the lip has a large clamping force on one side and a small clamping force on the other side. The wear amount of the lip shape 60 and the sealing lip 80 is different, and the oil leaks from the "gap" with large wear (the leakage path is Figure 2 The second sealing structure is installed well, but the cost is high, and the sealing lip 80 is also sealed by the clamping force generated by the spring 90, which also has the above problems. Both of these sealing structures cannot guarantee the mission of no oil leakage in a paddy field operation season. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the prior art and to provide a floating seal and a floating seal structure of a main and final oil seal for a steering drive axle. The device provides a floating seal structure of a main and final oil seal for a steering drive axle which has a compact structure, is easy to use and has strong sealing durability, thereby ensuring that the main and final oil seal for the steering drive axle has durable sealing performance.

[0005] To achieve the above object, one of the objects of the present invention is to provide a floating seal, comprising an annular base,

[0006] The annular base comprises:

[0007] at least one inner circumferential ring located in the middle of its inner ring wall and pointing radially inwards,

[0008] at least one outer peripheral ring located in the middle of its outer ring wall and pointing radially outwards,

[0009] At least two inner sealing rings are located on the inner ring wall thereof, and the inner sealing rings are arranged on both sides of the inner circumferential ring;

[0010] At least two outer sealing rings are located on the outer ring wall thereof, and the outer sealing rings are arranged on both sides of the outer circumferential ring.

[0011] As a preferred solution, it also includes an end circumferential ring located at one end of the outer ring wall of the annular base and pointing radially outward.

[0012] As a preferred solution, the inner circumferential ring has a first axial width along the axial direction of the annular base, and the outer circumferential ring has a second axial width along the axial direction of the annular base, and the first axial width is greater than the second axial width.

[0013] As a preferred solution, the outer circumferential ring has a first radial width along the radial direction of the annular base, and the end circumferential ring has a second radial width along the radial direction of the annular base, and the first radial width is smaller than the second radial width.

[0014] As a preferred solution, both the inner sealing ring and the outer sealing ring are O-rings.

[0015] As a preferred solution, it includes an annular base,

[0016] The annular base comprises:

[0017] An inner circumferential ring located in the middle of the inner ring wall and pointing radially inward;

[0018] An outer peripheral ring located in the middle section of the outer ring wall and pointing radially outward;

[0019] An end circumferential ring located at one end of the outer ring wall and pointing radially outward;

[0020] The inner circumferential ring has an inner wall surface, one side of the inner wall surface is connected to a first inner supporting surface, and the other side of the inner wall surface is connected to a second inner supporting surface;

[0021] A first inner annular surface and a second inner annular surface are provided on the inner walls of the annular base on both sides of the inner circumferential ring;

[0022] The first inner annular surface is connected to the first inner supporting surface and forms a first inner angle space, and the first inner angle space is used to install the first inner sealing ring; the second inner annular surface is connected to the second inner supporting surface and forms a second inner angle space; the second inner angle space is used to install the second inner sealing ring;

[0023] The outer peripheral ring has an outer wall surface, a first outer supporting surface is connected to one side of the outer wall surface, a second outer supporting surface is arranged on the second side of the outer wall surface, and the first outer annular surface and the second outer annular surface are arranged on the annular bases on both sides of the outer peripheral ring.

[0024] The first outer annular surface is connected to the first outer supporting surface and forms a first outer angle space; the first outer angle space is used to install the first outer sealing ring;

[0025] The end circumferential ring has a third outer supporting surface. The second outer annular surface, the second outer supporting surface and the third outer supporting surface form a sealing groove. The sealing groove is used to install a second outer sealing ring.

[0026] A second object of the present invention is to provide a floating sealing structure for a main and terminal oil seal for a steering drive axle, comprising a kingpin housing, an end housing and any of the floating seals described above, wherein a seat hole is provided on the end housing, a shaft portion is provided on the kingpin housing, the shaft portion is installed in the seat hole and forms an installation gap, and the sealing of the installation gap is achieved by a floating seal.

[0027] As a preferred embodiment, the inner cavity of the seat hole is stepped, and a first inner cavity hole for installing a thrust ball bearing, a second inner cavity hole for installing a sliding bearing, and a third inner cavity hole for installing the floating seal are arranged in sequence from the bottom of the seat hole to the port, and the first, second and third inner cavity holes are coaxially arranged.

[0028] As a preferred solution, one end of the shaft passes through a floating seal and a sliding bearing in sequence and abuts against the thrust ball bearing, and the inner wall of the third inner cavity hole and the outer annular surface of the shaft together form a corresponding recessed groove, in which the floating seal is installed.

[0029] As a preferred embodiment, the floating seal contacts the inner annular surface of the third inner cavity hole throughout the entire circumference of the outer surface through at least two outer sealing rings on its outer surface; the floating seal contacts the outer annular surface of the shaft portion throughout the entire circumference of the inner surface through at least two inner sealing rings on its inner surface; the floating seal is installed in the recess groove in the above manner, and when the rotation of the terminal housing causes the sliding bearing to wear, the extrusion rebound characteristics of the inner and outer sealing rings are utilized to realize automatic compensation and adaptation of the floating seal, so that the terminal housing can continue to remain centered with the shaft portion as the rotation center.

[0030] Beneficial Effects

[0031] Firstly, by improving the seal structure, the scheme achieves the sealing effect by utilizing the stress generated by the extrusion of the inner and outer sealing rings to exert the sealing performance, so that the tracking and durability of the seal rotation are very good; the second sealing effect is reflected in the strong anti-slip and anti-abnormal deformation capabilities of the main and final oil seals through the rebound effect of the inner and outer sealing rings; the third sealing effect is reflected in the support and positioning of the annular base, so that the inner and outer sealing rings have durable dynamic sealing capabilities, effectively solving the problem of oil leakage of the main and final oil seals in a paddy field operation season, and fulfilling the user's desire and mission of not leaking oil in the double-season rice main and final oil seals (floating seals). The structure can also be applied to similar structures of dynamic sealing of the end faces of steering components and walking components of other machinery.

[0032] Secondly, in this solution, the inner and outer sealing rings use O-rings, which have a large cross-section, good sealing and wear resistance, and a maze-like layout. In addition to ensuring good rotation, they effectively seal the muddy water and sand in the rice field and protect the lubricating oil inside the main end of the steering drive axle from leaking; at the same time, they are not affected by the dry and wet friction of rice field operations, and their performance is sustained.

[0033] Third, this solution also provides a floating seal structure for a steering drive axle. The floating seal is used as a main oil seal, in which an inner seal ring is elastically fitted to the shaft, and an outer seal ring is elastically fitted to the inner ring surface of the seat hole. By utilizing the extrusion rebound characteristics of the inner and outer seal rings, the floating seal is adapted and adjusted to automatically compensate, so that the end housing can continue to remain close to "centering" with the shaft as the rotation center. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0035] Figure 1It is a structural diagram of a dust cover + a separate oil seal in the prior art;

[0036] Figure 2 for Figure 1 Schematic diagram of oil seal leakage path of the structure;

[0037] Figure 3 It is a schematic diagram of a floating seal structure of a main and final oil seal for a steering drive axle of the present invention;

[0038] Figure 4 is a cross-sectional schematic diagram of a floating seal of the present invention;

[0039] Figure 5 It is a structural diagram of the ring base;

[0040] Figure 6 Table 1 is the data for the verification results of the use of floating seals.

[0041] Markings in the figure: 1, floating seal, 11, annular base, 111, inner circumferential ring, 1111, first inner supporting surface, 1112, second inner supporting surface, 1113, inner wall surface, 1114, first inner annular surface, 1115, second inner annular surface, 112, outer circumferential ring, 1121, first outer supporting surface, 1122, second outer supporting surface, 1123, outer wall surface, 1124, first outer annular surface, 1125, second outer annular surface, 113, end circumferential ring, 1131, third outer supporting surface, 12, inner sealing ring, 121, first inner sealing ring, 122, second inner sealing ring, 13, outer sealing ring, 131, first outer sealing ring, 132, second outer sealing ring, 2. Kingpin housing, 21. Shaft, 3. Sliding bearing, 4. End housing, 41. Seat hole, 411. First inner cavity hole, 412. Second inner cavity hole, 413. Third inner cavity hole, 5. Thrust ball bearing, 100. Sealing groove.

[0042] 10. Dust cover, 20. Inner ring, 30. Leakage path, 40. Outer ring, 60. Lip shape, 70. Sliding surface, 80. Sealing lip, 90. Spring. DETAILED DESCRIPTION

[0043] The present invention is described in detail below by means of exemplary embodiments. However, it should be understood that, without further description, elements, structures and features in one embodiment may also be beneficially combined in other embodiments.

[0044] It should be noted that, unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the invention belongs. The words "one", "an" or "the" and the like used in the patent application specification and claims of the present invention do not express quantitative limitations, but indicate the existence of at least one. Words such as "include" or "comprise" indicate that the elements or objects appearing before "include" or "comprises" include the elements or objects listed after "include" or "comprises" and their equivalents, but do not exclude other elements or objects with the same function.

[0045] Example 1

[0046] As shown in the figure, this embodiment provides a floating seal, which includes an annular base 11, an inner sealing ring 12 and an outer sealing ring 13. The inner sealing ring 12 and the outer sealing ring 13 are O-rings. The inner sealing ring 12 is arranged on the inner ring surface of the annular base 11, and the outer sealing ring 13 is arranged on the outer ring surface of the annular base 11, which are used to fit and seal the inner and outer ring surfaces of the annular base 11.

[0047] In this embodiment, the main body of the annular base 11 is a circular ring structure, and an inner circumferential ring 111 is arranged on the inner ring wall of the main body of the annular base 11. The inner circumferential ring 111 is a circular ring-shaped protrusion located in the middle section of the inner ring wall, and its central axis coincides with the central axis XX of the annular base 11. The inner circumferential ring 111 protrudes inward along the radial direction of the annular base 11.

[0048] In this embodiment, a full-circle outer circumferential ring 112 is arranged on the outer ring wall of the annular base 11. The outer circumferential ring 112 is a circular annular protrusion located in the middle section of the outer ring wall, and its central axis direction coincides with the central axis XX of the annular base 11. The outer circumferential ring 112 protrudes outward along the radial direction of the annular base 11.

[0049] In this solution, at least one inner circumferential ring 111 and one outer circumferential ring 112 are designed. Of course, more than one may be designed for each, and they are separated and arranged at intervals. Although designing more inner and outer circumferential rings can increase the sealing effect to a certain extent, the processing difficulty of the components will increase and the cost will increase.

[0050] In this embodiment, a full-circle end circumferential ring 113 is provided at one end of the outer ring wall of the annular base 11 . The end circumferential ring 113 protrudes outward in the radial direction of the annular base 11 , and the end circumferential ring 113 is parallel to the outer circumferential ring 112 .

[0051] In this embodiment, the inner annular surface of the annular base 11 is divided into a first inner annular surface 1114 and a second inner annular surface 1115 by an inner circumferential ring 111; the first inner annular surface 1114 is connected to the first inner supporting surface 1111 and forms a first inner angle space, in which a first inner sealing ring 121 is installed; the second inner annular surface 1115 is connected to the second inner supporting surface 1112 and forms a second inner angle space; and the second inner sealing ring 122 is installed in the second angle space.

[0052] In this embodiment, along the axis direction of XX of the annular base 11, the inner circumferential ring 111 has a first axial width H1, and the outer circumferential ring 112 has a second axial width H2, and the first axial width H1 is greater than the second axial width H2. This is because an end circumferential ring 113 needs to be provided on one side of the outer circumferential ring 112, and since the number of inner and outer sealing rings of the annular base 11 is equal, the corresponding second axial width H2 of the outer circumferential ring 112 is smaller than the first axial width H1 of the inner circumferential ring 111, thereby reserving a position for the design of the end circumferential ring 113.

[0053] In this embodiment, along the radial direction of the YY plane of the annular base 11, the outer circumferential ring 112 has a first radial width D1, and the end circumferential ring 113 has a second radial width D2, and the first radial width D1 is smaller than the second radial width D2. Since the end circumferential ring 113 needs to play a role in shielding mud, the end circumferential ring 113 should have a larger width so as to effectively isolate muddy water and muddy sand in the paddy field.

[0054] In this solution, the outer ring surface of the annular base 11 is divided into a first outer ring surface 1124 and a second outer ring surface 1125 by the outer circumferential ring 112, wherein the first outer ring surface 1124 is connected to the first outer supporting surface 1121 and forms a first outer angle space; a first outer sealing ring 131 is installed in the first outer angle space; the end circumferential ring 113 has a third outer supporting surface 1151 on the side close to the outer circumferential ring 112, and the second outer ring surface 1125, the second outer supporting surface 1122 and the third outer supporting surface 1151 form a sealing groove 100, and a second outer sealing ring 132 is installed in the sealing groove 100.

[0055] As described above and in combination with the accompanying drawings, the annular base 11, the inner circumferential ring 111 and the outer circumferential ring 112 form an approximate cross frame structure, and sealing rings are arranged at the four corners of the cross frame structure. In order to further ensure the second outer sealing ring 132 closest to the outside of the gap, an end circumferential ring 113 is particularly arranged at the second outer sealing ring 132. Such a design can prevent mud from entering the position of the sealing ring and prevent adverse effects on the floating seal 1.

[0056] The floating seal 1 is used as the main and final oil seal. On the one hand, the sealing performance is exerted through the stress generated by the extrusion of the O-ring, so that the tracking and durability of the main and final oil seal in rotation are very good; on the other hand, the rebound effect of the O-ring makes the main and final oil seal have strong anti-slip and anti-abnormal deformation capabilities in rotation; at the same time, the support and positioning of the annular base 11 makes the O-ring durable in dynamic sealing ability, effectively solving the problem of oil leakage of the main and final oil seal in a paddy field operation season.

[0057] Example 2

[0058] Combined with Figure 3 , the floating seal 1 rotates at the sliding bearing, which is intermittently rotating, and the rotation range is ±55°, so the sealing structure is in a low-speed biased load state. The front wheel positioning is corrected through different angles, and the following difficulties need to be overcome: due to the frequent rotation of the main and final oil seals, the sliding bearings are prone to wear, the radial clearance becomes larger, and the axis of rotation is deflected, that is, the "centering" of the rotation changes; because the main movement of the main and final oil seals is rotational movement, and it is also subject to the bumpy impact of the high tire, which is easy to produce axial movement, and the main and final oil seals are frequently covered with wet mud and sand mixed with rice stubble, which is not easy to peel off. During the alternation of operation transfer, the main and final parts rotate under the dry and wet friction conditions of mud and sand.

[0059] The present embodiment provides a floating seal structure of a main and terminal oil seal for a steering drive axle, comprising a floating seal 1, a kingpin housing 2, a sliding bearing 3, an end housing 4 and a thrust ball bearing 5. A seat hole 41 is provided on the end housing 4. The inner cavity of the seat hole 41 is stepped. From the bottom of the seat hole 41 to the end, first, second and third inner cavity holes 411, 412 and 413 are sequentially provided. The first, second and third inner cavity holes 411, 412 and 413 are coaxially arranged. The first inner cavity hole 411 is located at the bottom of the seat hole 41, and its function is to install the thrust ball bearing 5. The second inner cavity hole 412 is located in the middle position of the seat hole 41, and its function is to install the sliding bearing 3. The third inner cavity hole 413 is located at the orifice of the seat hole 41, and its function is to install the floating seal 1. Grease is evenly applied to the seat hole 41 of the end housing 4, and the sliding bearing 3 is pressed into the middle second inner cavity hole 412 of the end housing 4 using a special pressure head. Then, the thrust ball bearing 5 is placed in the lower first inner cavity hole 411 of the end housing 4. Grease is evenly applied to the floating seal 1, which is sleeved on the oil seal pressure head. With the inner diameter of the sliding bearing 3 as a guide and the end face of the thrust ball bearing 5 as an axial limit, the floating seal 1 is pressed into the upper third inner cavity hole 413 of the end housing 4. Finally, the kingpin housing 2 is installed into the inner holes of the sliding bearing 3 and the floating seal 1, and its end face contacts the thrust ball bearing 5. The first end of the floating seal 1 forms an opposing surface with the bottom surface of the third inner cavity hole 413, and the second end forms an opposing surface with the end face around the shaft 21 of the kingpin housing 2.

[0060] In this solution, the kingpin housing 2 is a non-rotating part, and the surface roughness of the journal of the sealed sliding bearing is required to be controlled within Ra1.6-Ra3.2; the sliding bearing 3, the end housing 4 and the thrust ball bearing 5 are rotating parts, which are intermittently rotating with an inclined angle.

[0061] In this embodiment, the floating seal 1 serves as the main oil seal, which is assembled from an annular base 11, an inner sealing ring 12 and an outer sealing ring 13. The inner sealing ring 12 and the outer sealing ring 13 are O-rings. The fitting clearance between the inner diameter of the annular base 11 and the shaft portion 21 is a first clearance width, and the fitting clearance between the outer diameter of the annular base 11 and the seat hole 41 is a second clearance width. The first clearance width is greater than the second clearance width.

[0062] In this scheme, a preferred embodiment of the floating seal 1 is as follows: the floating seal 1 includes an annular base 11, which mainly plays a supporting role. The annular base 11 is annular, and an inner circumferential ring 111 is arranged in the middle section of its inner ring wall and points radially inward; an outer circumferential ring 112 is arranged in the middle section of its outer ring wall and points radially outward; a circumferential ring 113 is arranged at one end of its outer ring wall and points radially outward; the inner circumferential ring 111 has an inner wall surface 1113, and a first inner supporting surface 1111 and a second inner supporting surface 1112 are connected on both sides of the inner wall surface 1113; both sides of the inner circumferential ring 111 A first inner annular surface 1114 and a second inner annular surface 1115 are provided on the inner wall of the annular base; the first inner annular surface 1114 is connected to the first inner supporting surface 1111 and forms a first inner angle space, and a first inner sealing ring 121 is used to be installed in the first inner angle space, wherein the first inner sealing ring 121 is used to seal the outer port of the sliding bearing 3; the second inner annular surface 1115 is connected to the second inner supporting surface 1112 and forms a second inner angle space; a second inner sealing ring 122 is used to be installed in the second inner angle space, and the second sealing ring is located at the corner between the shaft and the main body of the kingpin housing 2. The outer circumferential ring 112 has an outer wall surface 1123, and a first outer supporting surface 1121 and a second outer supporting surface 1122 are connected on both sides of the outer wall surface. A first outer annular surface 1124 and a second outer annular surface 1125 are arranged on the annular base 11 on both sides of the outer circumferential ring 112. The first outer annular surface 1124 is connected to the first outer supporting surface 1121 and forms a first outer angle space; a first outer sealing ring 131 is used to be installed in the first outer angle space, and the first outer sealing ring 131 is located at the corner of the seat hole 41; the end circumferential ring 113 has a third outer supporting surface 1131, and the second outer annular surface 1125, the second outer supporting surface 1122 and the third outer supporting surface 1131 form a sealing groove 100, and the sealing groove 100 is used to install a second outer sealing ring 132, and the second outer sealing ring 132 is used to seal the port of the shaft portion 21 and the seat hole 41.

[0063] In this solution, the anti-slip and anti-abnormal deformation capabilities of the O-type sealing ring are enhanced by the support of the annular base 11, ensuring the durability of the sealing ability and not being affected by bumps and shocks. The O-type sealing ring used has a large cross-section, good sealing and wear resistance, and a labyrinth arrangement, which not only ensures good rotation, but also effectively isolates the muddy water and sand in the rice field, and protects the lubricating oil inside the main end of the steering drive axle from leakage; at the same time, it is not affected by the dry and wet friction of rice field operations, and the performance is sustained. .

[0064] This scheme adopts the design of inner and outer sealing rings, which generate compression force by squeezing O-rings and seal evenly; when the inner sealing ring 12 or the outer sealing ring 13 is pressed against the outer wall of the shaft 21 or the inner wall of the seat hole 41, it evenly fits the walls on both sides to play a sealing role; when the sliding bearing is worn, the inner and outer sealing rings 12 and 13 are automatically radially compensated to achieve the initial sealing matching relationship, that is, the rotation center continues to remain close to "centering". At the same time, the more critical design is that the inner and outer sealing surfaces of the floating seal 1 of this scheme are in contact with the wall of the seat hole 41 and the shaft 21 through the O-rings, and the inner and outer sealing rings can not only play the role of independent inner and outer sealing, such as one side is pressed or relaxed, thereby generating compression sealing and automatic compensation, but also the sealing ring components on both sides can form a mutual compensation effect between the inner and outer sides to a certain extent through the organic cooperation of the inner and outer elastic contact surfaces. For example, when the pressure on the inner (outer) sealing ring increases, the pressure on the corresponding outer (inner) sealing ring also increases, and the inner and outer sealing rings on both sides bear the pressure together, thereby improving the deformation resistance of the floating sealing ring 1; when the pressure on the inner (outer) sealing ring decreases, the pressure on the corresponding outer (inner) sealing ring also decreases, and the inner and outer sealing rings at the corresponding positions rebound synchronously to achieve radial compensation, thereby improving the automatic compensation capability of the floating sealing ring 1.

[0065] In this solution, more than two inner and outer sealing rings are designed on the inner and outer walls of the annular base 11 along the axial direction. The purpose of such design is to ensure that during the rotation process, through the action of the two end points of the same axis, the end shell 4 is always close to the position of the rotation center with the shaft 21 as the center, so as to prevent the rotation center line of one end of the shaft 21 from being skewed. At the same time, designing more than two inner and outer sealing rings helps to form a maze structure on the contact surface of the sealing structure.

[0066] The experimental results of the first phase of verification experiment (3 batches in total) of this scheme are as follows Table 1:

[0067] batch Number of floating seals Experiment time Experimental Results Experimental location First batch 8 items Working hours: 400h ~ 500h No oil leakage; continue to use Xuancheng, Anhui Second batch 4 items Working hours: 300h ~ 350h No oil leakage; continue to use Anhui Huaining The third batch 4 items Working hours: 400h ~ 580h No oil leakage; continue to use Qichun, Hubei

[0068] The device is currently undergoing the second phase of verification, with a small batch trial installation of 30 steering drive axle assemblies, totaling 60 parts. No oil leakage reports have been reported so far, and experimental tracking is continuing.

[0069] After adopting the above scheme, the main and terminal oil seals meet the requirement of no oil leakage in paddy field tractors in two seasons due to the use of floating seals; it not only improves the fault tolerance of paddy field working conditions, but also reduces the manufacturing cost of parts.

[0070] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with this profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A floating seal, characterized in that: Including ring base, The annular base comprises: An inner circumferential ring located in the middle of the inner ring wall and pointing radially inward; An outer peripheral ring located in the middle section of the outer ring wall and pointing radially outward; An end circumferential ring located at one end of the outer ring wall and pointing radially outward; The inner circumferential ring has an inner wall surface, one side of the inner wall surface is connected to a first inner supporting surface, and the other side of the inner wall surface is connected to a second inner supporting surface; A first inner annular surface and a second inner annular surface are provided on the inner walls of the annular base on both sides of the inner circumferential ring; The first inner annular surface is connected to the first inner supporting surface and forms a first inner angle space, and the first inner angle space is used to install the first inner sealing ring; the second inner annular surface is connected to the second inner supporting surface and forms a second inner angle space; the second inner angle space is used to install the second inner sealing ring; The outer peripheral ring has an outer wall surface, a first outer supporting surface is connected to one side of the outer wall surface, a second outer supporting surface is arranged on the second side of the outer wall surface, and the first outer annular surface and the second outer annular surface are arranged on the annular bases on both sides of the outer peripheral ring. The first outer annular surface is connected to the first outer supporting surface and forms a first outer angle space; the first outer angle space is used to install the first outer sealing ring; The end circumferential ring has a third outer supporting surface. The second outer annular surface, the second outer supporting surface and the third outer supporting surface form a sealing groove. The sealing groove is used to install a second outer sealing ring.

2. A floating seal according to claim 1, characterized in that: The inner circumferential ring has a first axial width along the axial direction of the annular base, and the outer circumferential ring has a second axial width along the axial direction of the annular base, and the first axial width is greater than the second axial width.

3. A floating seal as claimed in claim 1, characterized in that: The outer circumferential ring has a first radial width along the radial direction of the annular base, and the end circumferential ring has a second radial width along the radial direction of the annular base, and the first radial width is smaller than the second radial width.

4. A floating seal as claimed in claim 1, characterized in that: The inner sealing ring and the outer sealing ring are both O-shaped sealing rings.

5. The floating seal structure of the main and final oil seals for the steering drive axle is characterized by: It comprises a kingpin housing, an end housing and the floating seal as claimed in any one of claims 1 to 4, wherein a seat hole is arranged on the end housing, a shaft portion is arranged on the kingpin housing, the shaft portion is installed in the seat hole and forms an installation gap, and the sealing of the installation gap is achieved by the floating seal.

6. The floating seal structure of the main and final oil seal for the steering drive axle according to claim 5, characterized in that: The inner cavity of the seat hole is stepped, and a first inner cavity hole for installing a thrust ball bearing, a second inner cavity hole for installing a sliding bearing, and a third inner cavity hole for installing the floating seal are arranged in sequence from the bottom of the seat hole to the port. The first, second and third inner cavity holes are arranged coaxially.

7. The floating seal structure of the main and final oil seal for the steering drive axle according to claim 6, characterized in that: One end of the shaft portion passes through the floating seal and the sliding bearing in sequence and abuts against the thrust ball bearing. The inner wall of the third inner cavity hole and the outer annular surface of the shaft portion together form a corresponding notch groove, and the floating seal is installed in the notch groove.

8. The floating seal structure of the main and final oil seal for the steering drive axle according to claim 7, characterized in that: The floating seal contacts the inner annular surface of the third inner cavity hole throughout the entire circumference of the outer surface through at least two outer sealing rings on its outer surface; the floating seal contacts the outer annular surface of the shaft portion throughout the entire circumference of the inner surface through at least two inner sealing rings on its inner surface; the floating seal is installed in the recess groove in the above manner, and when the rotation of the terminal housing causes the sliding bearing to wear, the extrusion rebound characteristics of the inner and outer sealing rings are utilized to realize automatic compensation and adaptation of the floating seal, so that the terminal housing can continue to remain centered with the shaft portion as the rotation center.

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