Pneumatic balance type four-row tapered roller bearing

Abstract

The present application relates to the technical field of bearings, and particularly to a pneumatic balance type four-row tapered roller bearing, which includes an inner ring group and an outer ring group. An installation gap is provided between the outer peripheral wall of the inner ring group and the inner peripheral wall of the outer ring group. There are four rows of roller installation grooves in the installation gap, and a plurality of tapered rollers are rotatably assembled in the roller installation grooves. An annular cage is arranged in each row of roller installation grooves. Both ends of the installation gap are sealed by two groups of oil seals respectively. A plurality of inner ventilation holes are arranged radially on the inner ring group, and a plurality of outer ventilation holes are arranged radially on the outer ring group. Pneumatic balance holes are arranged on both end faces of the outer ring group. The pneumatic balance holes, the inner ventilation holes, and the outer ventilation holes are all communicated with the installation gap and are filled with a breathable and grease-impermeable material inside. The present application is not prone to leakage due to unbalanced air pressure, and the breathable and grease-impermeable material also has the function of blocking the penetration of grease, so it is not easy to occur oil leakage phenomenon, the bearing is not easy to be damaged, and the service life of the bearing is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of bearings, and in particular to a pneumatic balance type four-row tapered roller bearing. Background Art

[0002] Four-row tapered roller bearings have been successfully used in bearing configurations of rolling mills around the world with rolling speeds ranging from low to medium. Due to their design, such bearings can withstand axial loads that occur in such applications in addition to radial loads, and generally no additional thrust bearings are required in the bearing configuration. This means that the roll necks can be relatively short, and the bearing housings on both sides of the roll can have the same design. Due to the design of the four-row tapered roller bearing, such bearings must be installed as complete bearings on the roll bearing housings.

[0003] For example, Chinese Patent No. CN201010514878.9 discloses a four-row tapered roller bearing without spacer rings, which includes an outer ring, a second outer ring, an inner ring, a cage, and tapered rollers; the two sides of the outside of the bearing are two single-raceway outer rings and a double-raceway second outer ring therebetween, and there are two double-raceway inner rings on both sides inside, tapered rollers are arranged between the inner ring and the outer ring and the second outer ring, and each tapered roller is fixed by a cage.

[0004] Regarding the above related technologies, the inventor believes that there are the following technical defects to be improved:

[0005] In the actual application process of common four-row tapered roller bearings, when the bearing is working, the temperature of the bearing will rise, resulting in high temperature and high pressure inside the bearing, and the internal grease is likely to overflow, and even the sealing rings on the end face side are flushed out by the internal high pressure, resulting in bearing damage. When the equipment stops working, the temperature of the bearing continuously returns to normal temperature, and a negative pressure is formed inside, allowing external pollutants and particles to enter the bearing interior, accelerating grease contamination failure and internal wear of the bearing, and significantly shortening the service life. Summary of the Invention

[0006] The present application provides a pneumatic balance type four-row tapered roller bearing to improve the following technical problems:

[0007] In the actual application process of common four-row tapered roller bearings, the internal grease is likely to overflow, resulting in bearing damage, and a negative pressure is easily formed inside, allowing external pollutants and particles to enter the bearing interior, accelerating grease contamination failure and internal wear of the bearing.

[0008] The present application provides a pneumatic balance type four-row tapered roller bearing, adopting the following technical solutions:

[0009] A pneumatic balance type four-row tapered roller bearing includes an inner ring group and an outer ring group. An installation gap is provided between the outer peripheral wall of the inner ring group and the inner peripheral wall of the outer ring group. There are four rows of roller installation grooves in the installation gap. A plurality of tapered rollers are rotatably assembled in the roller installation grooves. An annular cage for relatively fixing the tapered rollers is provided in each row of the roller installation grooves. Both ends of the installation gap are sealed by two groups of oil seals respectively. A plurality of inner ventilation holes are arranged radially on the inner ring group, and a plurality of outer ventilation holes are arranged radially on the outer ring group. Pressure balance holes are provided on both end faces of the outer ring group. The pressure balance holes, the inner ventilation holes, and the outer ventilation holes are all communicated with the installation gap and are filled with breathable and grease-impermeable materials inside. The number of the outer ventilation holes is between 4 and 14, and the plurality of outer ventilation holes are symmetrically and spacedly arranged around the central axis of the bearing. The distance between adjacent inner ventilation holes is 0.2 to 0.4 times the radius of the inner ring group.

[0010] In an implementable technical solution of the present application, a spiral grease groove is provided on the inner surface of the inner ring group. There are 3 to 8 evenly spaced inner ventilation holes corresponding to each circle of the spiral grease groove.

[0011] In an implementable technical solution of the present application, the inner ventilation holes on adjacent circles of the spiral grease groove are arranged in a staggered manner.

[0012] In an implementable technical solution of the present application, the four rows of tapered rollers divide the bearing into a load area one, a load area two, a load area three, and a load area four. A part of the outer ventilation holes are evenly spaced on the dividing line between the load area one and the load area two, and the remaining outer ventilation holes are evenly spaced on the dividing line between the load area three and the load area four. And there are 4 to 7 outer ventilation holes corresponding to each of the two dividing lines.

[0013] In an implementable technical solution of the present application, a first high-carbon alloy steel sleeve is provided in the inner ventilation hole, and a second high-carbon alloy steel sleeve is provided in the outer ventilation hole. The breathable and grease-impermeable material is filled in the first high-carbon alloy steel sleeve and the second high-carbon alloy steel sleeve.

[0014] In an implementable technical solution of the present application, the breathable and grease-impermeable material is a nano-coated sponge, a polypropylene nano-composite material, or a microporous PET breathable material.

[0015] In an implementable technical solution of the present application, the inner ring group includes a first inner ring and a second inner ring. The first inner ring and the second inner ring respectively correspond to two rows of the tapered rollers. An inner sealing groove is provided at the joint of the inner side walls of the first inner ring and the second inner ring. An inner diameter sealing ring is embedded and fixed in the inner sealing groove.

[0016] In an implementable technical solution of the present application, the inner diameter sealing ring includes an inner ring skeleton and an inner ring rubber layer. The inner ring rubber layer wraps around the outer surface of the inner ring skeleton, and a notch is provided at one corner of the inner ring rubber layer for one corner edge of the inner ring skeleton to protrude.

[0017] In an implementable technical solution of the present application, the outer ring group includes a central outer ring, two side outer rings, two end retaining rings, and two outer spacer rings. One of the outer spacer rings is clamped between one end of the central outer ring and one of the side outer rings, and the other outer spacer ring is clamped between the other end of the central outer ring and the other side outer ring. The two end retaining rings are respectively located at the two end faces of the bearing. The air pressure balance holes are provided on the end retaining rings, the outer ventilation holes are provided on the outer spacer rings, and the oil seal group is installed between the inner side of the end retaining rings and the outer side of the inner ring group.

[0018] In an implementable technical solution of the present application, the oil seal group includes an oil seal skeleton, an oil seal rubber layer, and a tightening spring. The oil seal rubber layer wraps around the outer side of the oil seal skeleton. An annular groove corresponding to the tightening spring is provided on the oil seal rubber layer. One end face of the oil seal rubber layer abuts against the outer peripheral wall of the inner ring group through the tightening spring, and the other end face of the oil seal rubber layer abuts against the inner peripheral wall of the outer ring group through the oil seal skeleton.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] By adding air pressure balance holes, multiple inner ventilation holes, and multiple outer ventilation holes, and connecting all the above holes through the series connection effect of the installation gaps. Due to the good air permeability of the air-permeable and grease-impermeable material, the air pressure on the inner side, outer side, and end faces of the bearing can be kept consistent, that is, the air pressure balance state is always maintained during use. Thus, the grease in the bearing installation gap, the grease on the inner peripheral wall of the bearing, and the grease on the outer peripheral wall of the bearing are not likely to leak due to air pressure difference, and external pollutants and particles are not likely to enter the bearing interior due to the pressure difference after cooling, effectively preventing internal grease contamination failure and internal wear of the bearing. Moreover, the air-permeable and grease-impermeable material also has the characteristic of blocking grease penetration, and it is not easy to cause the phenomenon of grease cross-flow of the grease in the bearing installation gap, the grease on the inner peripheral wall of the bearing, and the grease on the outer peripheral wall of the bearing, making the bearing not easily damaged and greatly extending the service life of the bearing. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 It is a schematic structural diagram of a gas pressure balanced four-row tapered roller bearing according to an embodiment of the present application.

[0023] Figure 2 Schematic diagram of the structure of the oil seal group in the embodiment of the present application.

[0024] Figure 3 It is a schematic diagram of the structure of the inner diameter sealing ring in the embodiment of the present application.

[0025] Figure 4 It is a schematic diagram of the structure of the first high carbon alloy steel sleeve and its interior in the embodiment of the present application.

[0026] Figure 5 It is a schematic diagram of the structure of the second high carbon alloy steel sleeve and its interior in the embodiment of the present application.

[0027] Description of reference numerals:

[0028] 1. Inner ring group; 11. First inner ring; 12. Second inner ring; 13. Inner diameter sealing ring; 131. Inner ring skeleton; 132. Inner ring rubber layer; 1321. Notch;

[0029] 2. Outer ring assembly; 21. Center outer ring; 22. Side outer ring; 23. End retaining ring; 24. Outer spacer; 25. O-ring;

[0030] 3. Tapered roller;

[0031] 4. Ring cage;

[0032] 5. Oil seal assembly; 51. Oil seal frame; 52. Oil seal rubber layer; 53. Tightening spring;

[0033] 6. Breathable and grease-proof material;

[0034] 7. The first high carbon alloy steel sleeve;

[0035] 8. Second high carbon alloy steel sleeve;

[0036] 100, spiral grease groove; 200, installation clearance; 300, internal vent hole; 400, external vent hole; 500, air pressure balance hole. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0038] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0039] It should be understood that the orientation or positional relationship indicated by the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0040] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0041] The following is a further detailed description of the present application with reference to the attached Figures 1-5 drawings.

[0042] An embodiment of the present application discloses a pneumatic balance type four-row tapered roller bearing. Refer to Figures 1-5, the air pressure balanced four-row tapered roller bearing includes an inner ring group 1 and an outer ring group 2. There is an installation gap 200 between the outer peripheral wall of the inner ring group 1 and the inner peripheral wall of the outer ring group 2. There are four rows of roller installation grooves in the installation gap 200. A plurality of tapered rollers 3 are rotatably assembled in the roller installation grooves. An annular cage 4 for relatively fixing the tapered rollers 3 is provided in each row of roller installation grooves. Both ends of the installation gap 200 are sealed by two groups of oil seals 5 respectively. A plurality of inner ventilation holes 300 are arranged radially on the inner ring group 1, and a plurality of outer ventilation holes 400 are arranged radially on the outer ring group 2. Air pressure balance holes 500 are provided on both end faces of the outer ring group 2. The air pressure balance holes 500, the inner ventilation holes 300, and the outer ventilation holes 400 are all communicated with the installation gap 200 and are all filled with a breathable and grease-impermeable material 6. The number of the outer ventilation holes 400 is between 4 and 14, and the plurality of outer ventilation holes 400 are symmetrically and spacedly arranged around the central axis of the bearing. The distance between adjacent inner ventilation holes 300 is 0.2-0.4 times the radius of the inner ring group 1.

[0043] In order to ensure that more grease can be loaded on the inner peripheral wall of the bearing to improve the lubrication characteristics and reduce wear, a spiral grease groove 100 is provided on the inner surface of the inner ring group 1. There are 3-8 evenly spaced inner ventilation holes 300 corresponding to each circle of the spiral grease groove 100, and the inner ventilation holes 300 on adjacent circles of the spiral grease groove 100 are arranged in a staggered manner. In this embodiment, the open end of the spiral grease groove 100 does not extend to the end of the inner ring group 1. In other embodiments, according to specific requirements, the open end of the spiral grease groove 100 can also extend to both ends of the inner ring group 1.

[0044] The above-mentioned multiple inner ventilation holes 300 arranged in a spiral and cross-staggered manner are more evenly and comprehensively distributed, which is beneficial to the full connection between the inner peripheral wall of the bearing and the installation gap 200 and maintaining a ventilation state. At the same time, the structural distribution is relatively uniform, and the influence on the structural strength of the inner ring group 1 is smaller.

[0045] In this embodiment, the tapered rollers 3 divide the bearing into a load area 1, a load area 2, a load area 3, and a load area 4. A part of the outer ventilation holes 400 are evenly spaced on the dividing line between the load area 1 and the load area 2, and the remaining outer ventilation holes 400 are evenly spaced on the dividing line between the load area 3 and the load area 4, and there are 4-7 outer ventilation holes 400 corresponding to each of the two dividing lines.

[0046] The above-designed outer ventilation holes 400 and inner ventilation holes 300 are more convenient for the machining and manufacturing of the bearing before assembly. Moreover, before filling the breathable and grease-impermeable material 6, the outer ventilation holes 400 can also be used as oil injection holes. However, after assembly, the breathable and grease-impermeable material 6 is filled for sealing, which can achieve multiple functions with one hole.

[0047] In order to reduce the adverse effects of drilling on the structural strength of the inner ring group 1 and the outer ring group 2, a first high-carbon alloy steel sleeve 7 is arranged in the inner vent hole 300, and a second high-carbon alloy steel sleeve 8 is arranged in the outer vent hole 400. A breathable and grease-impermeable material 6 is filled between the first high-carbon alloy steel sleeve 7 and the second high-carbon alloy steel sleeve 8. To adapt to the structure of the spiral grease groove 100, the inner end of the first high-carbon alloy steel sleeve 7 is designed as a concave arc structure, see Figure 4 . Before the interference fit of the first high-carbon alloy steel sleeve 7 and the second high-carbon alloy steel sleeve 8, the breathable and grease-impermeable material 6 can be filled in the first high-carbon alloy steel sleeve 7 and the second high-carbon alloy steel sleeve 8 in advance to reduce the manufacturing and assembly difficulties.

[0048] In this embodiment, the breathable and grease-impermeable material 6 is a nano-coated sponge, a polypropylene nano-composite material or a microporous PET breathable material. The above material selection not only has good chemical stability and is not easy to deteriorate due to the high temperature generated by friction, but also has good breathability and good barrier properties to grease.

[0049] In this embodiment, based on the existing production equipment, in order to reduce the manufacturing difficulty of the inner ring group 1, the inner ring group 1 includes a first inner ring 11 and a second inner ring 12. The first inner ring 11 and the second inner ring 12 respectively correspond to two rows of tapered rollers 3. An inner sealing groove is provided at the connection of the inner side walls of the first inner ring 11 and the second inner ring 12, and an inner diameter sealing ring 13 is fixedly embedded in the inner sealing groove. The above split inner ring group 1 not only has low manufacturing difficulty and low assembly difficulty, but also improves the inner sealing performance of the bearing by adding the inner sealing groove and the inner diameter sealing ring 13.

[0050] The inner diameter sealing ring 13 includes an inner ring skeleton 131 and an inner ring rubber layer 132. The inner ring rubber layer 132 wraps around the outer surface of the inner ring skeleton 131, and a notch 1321 is provided at one corner of the inner ring rubber layer 132 for a corner of the inner ring skeleton 131 to leak out. The inner diameter sealing ring 13 designed above is not only simple to manufacture, has a firm and stable structure and is convenient for assembly, but also the design of the notch 1321 can provide a certain amount of movement space for the inner diameter sealing ring 13, effectively avoiding structural damage caused by over-assembly of the inner diameter sealing ring 13.

[0051] The inner ring rubber layer 132 shall meet the requirements of the JB / T6639 standard, and the inner ring skeleton 131 and the inner ring rubber layer 132 shall be firmly bonded. The inner ring skeleton 131 is deburred and surface phosphated for rust prevention, and the surface roughness of the inner ring rubber layer 132 shall reach Ra1.6.

[0052] In this embodiment, based on the existing production equipment, in order to reduce the production difficulty of the outer ring group 2, the outer ring group 2 includes a central outer ring 21, two side outer rings 22, two end retaining rings 23 and two outer spacer rings 24. One outer spacer ring 24 is clamped between one end of the central outer ring 21 and one side outer ring 22, and the other outer spacer ring 24 is clamped between the other end of the central outer ring 21 and the other side outer ring 22. The two end retaining rings 23 are respectively located at the two end faces of the bearing. The air pressure balance holes 500 are provided on the end retaining rings 23, and the external ventilation holes 400 are provided on the outer spacer rings 24. The oil seal group 5 is installed between the inner side of the end retaining ring 23 and the outer side of the inner ring group 1. The air pressure balance hole 500 is of an L-shaped structure, and the inner end of the air pressure balance hole 500 does not contact the oil seal group 5 at all to ensure a good breathable environment. An O-ring 25 is also embedded on the outer peripheral wall of the end retaining ring 23 to seal the grease between the outer peripheral wall of the bearing and the external components as much as possible.

[0053] The above-mentioned split outer ring group 2 not only has low production difficulty and low assembly difficulty, but also reduces the oil leakage possibility of the bearing by adding the oil seal group 5.

[0054] In this embodiment, the oil seal group 5 includes an oil seal skeleton 51, an oil seal rubber layer 52 and a tightening spring 53. The oil seal rubber layer 52 wraps around the outer side of the oil seal skeleton 51. An annular groove corresponding to the tightening spring 53 is provided on the oil seal rubber layer 52. One end face of the oil seal rubber layer 52 is pressed against the outer peripheral wall of the inner ring group 1 through the tightening spring 53, and the other end face of the oil seal rubber layer 52 is pressed against the inner peripheral wall of the outer ring group 2 through the oil seal skeleton 51. The above-mentioned oil seal group 5 not only has a simple structure, firm assembly and is not easy to loosen, but also has a better sealing effect on grease, further reducing the oil leakage possibility of the bearing.

[0055] The oil seal rubber layer 52 and the inner rubber layer 132 shall meet the requirements of the JB / T6639 standard, and the oil seal skeleton 51 and the oil seal rubber layer 52 shall be firmly bonded. The oil seal skeleton 51 is deburred and surface phosphated for rust prevention, and the surface roughness of the oil seal rubber layer 52 shall reach Ra1.6.

[0056] Some parameters of the air pressure balance type four-row tapered roller bearing in the embodiment of the present application are as follows:

[0057] Dimensional accuracy: Class2, running accuracy: P5, rated load: Cr = 1670KN Cor = 3930KN, axial clearance: 0.36 - 0.45mm, radial clearance: 0.096 - 0.12mm, grease filling: Mobilith SHC 460 (0.57 ± 0.03Kg). The outer peripheral wall of the outer ring group 2 is equally divided into four parts and marked with Roman numerals Ⅰ, Ⅱ, Ⅲ, Ⅳ respectively to distinguish the four load zones.

[0058] The beneficial technical effects of the pneumatic balance type four-row tapered roller bearing according to the embodiments of the present application are generally as follows:

[0059] By adding pneumatic balance holes 500, a plurality of inner ventilation holes 300, and a plurality of outer ventilation holes 400, and connecting all the above holes through the series connection effect of the installation gap 200, due to the good air permeability of the air-permeable and grease-impermeable material 6, the air pressure on the inner side, outer side, and end face of the bearing can be kept consistent, that is, the pneumatic balance state is always maintained during use. Therefore, the grease in the bearing installation gap 200, the grease on the inner peripheral wall of the bearing, and the grease on the outer peripheral wall of the bearing are not easily leaked due to the air pressure difference, and external pollutants and particles are not easily entered into the bearing interior due to the pressure difference after cooling, effectively preventing the internal grease pollution failure and the internal wear of the bearing. Moreover, the air-permeable and grease-impermeable material 6 also has the characteristic of blocking the penetration of grease, and it is not easy to cause the phenomenon of grease cross-flow of the grease in the bearing installation gap 200, the grease on the inner peripheral wall of the bearing, and the grease on the outer peripheral wall of the bearing, making the bearing not easily damaged and greatly extending the service life of the bearing.

[0060] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the application shall be included in the protection scope of the present application.

Claims

1. A pneumatic balance type four-row tapered roller bearing, characterized in that, It includes an inner ring group (1) and an outer ring group (2). There is an installation gap (200) between the outer peripheral wall of the inner ring group (1) and the inner peripheral wall of the outer ring group (2). There are four rows of roller installation grooves in the installation gap (200). A plurality of tapered rollers (3) are rotatably assembled in the roller installation grooves. An annular cage (4) for relatively fixing the tapered rollers (3) is arranged in each row of the roller installation grooves. Both ends of the installation gap (200) are sealed by two groups of oil seal groups (5) respectively. A plurality of inner ventilation holes (300) are arranged radially on the inner ring group (1). A plurality of outer ventilation holes (400) are arranged radially on the outer ring group (2). Pressure balance holes (500) are arranged on both end faces of the outer ring group (2). The pressure balance holes (500), the inner ventilation holes (300), and the outer ventilation holes (400) are all communicated with the installation gap (200) and filled with a breathable and grease-impermeable material (6) inside. The number of the outer ventilation holes (400) is between 4 and 14, and a plurality of the outer ventilation holes (400) are symmetrically and spacedly arranged around the central axis of the bearing. The distance between adjacent inner ventilation holes (300) is 0.2 to 0.4 times the radius of the inner ring group (1).

2. The gas pressure balanced four-row tapered roller bearing according to claim 1, wherein A spiral grease groove (100) is arranged on the inner surface of the inner ring group (1). There are 3 to 8 evenly spaced inner ventilation holes (300) corresponding to each circle of the spiral grease groove (100).

3. The pressure balance type four-row tapered roller bearing according to claim 2, wherein, The inner ventilation holes (300) on adjacent circles of the spiral grease groove (100) are arranged in a staggered manner.

4. The pneumatic balance type four-row tapered roller bearing according to claim 1, characterized in that, The four rows of tapered rollers (3) divide the bearing into a load zone one, a load zone two, a load zone three, and a load zone four. A part of the outer ventilation holes (400) are evenly and spacedly distributed on the dividing line between the load zone one and the load zone two, and the rest of the outer ventilation holes (400) are evenly and spacedly distributed on the dividing line between the load zone three and the load zone four. And there are 4 to 7 outer ventilation holes (400) corresponding to each of the two dividing lines.

5. The air pressure balanced four-row tapered roller bearing according to claim 1, characterized in that, A first high-carbon alloy steel sleeve (7) is arranged in the inner ventilation hole (300). A second high-carbon alloy steel sleeve (8) is arranged in the outer ventilation hole (400). The breathable and grease-impermeable material (6) is filled in the first high-carbon alloy steel sleeve (7) and the second high-carbon alloy steel sleeve (8).

6. The gas pressure balance type four-row tapered roller bearing according to claim 1, wherein The breathable and grease-impermeable material (6) is a nano-coated sponge, a polypropylene nano-composite material, or a microporous PET breathable material.

7. The air pressure balanced four-row tapered roller bearing according to claim 1, wherein The inner ring group (1) includes a first inner ring (11) and a second inner ring (12). The first inner ring (11) and the second inner ring (12) respectively correspond to two rows of the tapered rollers (3). An inner sealing groove is arranged at the junction of the inner side walls of the first inner ring (11) and the second inner ring (12). An inner diameter sealing ring (13) is embedded and fixed in the inner sealing groove.

8. The air pressure balanced four-row tapered roller bearing according to claim 7, wherein The inner diameter sealing ring (13) includes an inner ring skeleton (131) and an inner ring rubber layer (132). The inner ring rubber layer (132) wraps around the outer surface of the inner ring skeleton (131), and a notch (1321) is provided at a corner of the inner ring rubber layer (132) for a corner of the inner ring skeleton (131) to protrude.

9. The gas pressure balance type four-row tapered roller bearing according to claim 1, wherein The outer ring group (2) includes a central outer ring (21), two side outer rings (22), two end retaining rings (23), and two outer spacer rings (24). One of the outer spacer rings (24) is clamped between one end of the central outer ring (21) and one of the side outer rings (22), and the other outer spacer ring (24) is clamped between the other end of the central outer ring (21) and the other side outer ring (22). The two end retaining rings (23) are respectively located at the two end faces of the bearing. The air pressure balance holes (500) are provided in the end retaining rings (23), the outer ventilation holes (400) are provided in the outer spacer rings (24), and the oil seal group (5) is installed between the inner side of the end retaining rings (23) and the outer side of the inner ring group (1).

10. The air pressure balanced four-row tapered roller bearing according to claim 1, wherein The oil seal group (5) includes an oil seal skeleton (51), an oil seal rubber layer (52), and a tightening spring (53). The oil seal rubber layer (52) wraps around the outer side of the oil seal skeleton (51). An annular groove corresponding to the tightening spring (53) is provided on the oil seal rubber layer (52). One end face of the oil seal rubber layer (52) abuts against the outer peripheral wall of the inner ring group (1) through the tightening spring (53), and the other end face of the oil seal rubber layer (52) abuts against the inner peripheral wall of the outer ring group (2) through the oil seal skeleton (51).

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