A sliding bearing with dustproof sealing structure

Abstract

The present invention relates to the technical field of sliding bearings, and in particular to a sliding bearing with a dustproof sealing structure, comprising a bearing seat, a bearing cover, an annular member and an adjusting mechanism, wherein the annular member comprises a first support assembly and a second support assembly, and the adjusting mechanism comprises an adjusting ring. During normal operation, the first support assembly and the second support assembly do not slide relative to each other, and the bearing seat and the bearing cover rotate relative to the annular member. During leakage, the first support assembly and the second support assembly slide relative to each other, and the bearing seat and the bearing cover do not rotate relative to the annular member. The adjusting ring rotates clockwise, so that the second support assembly and the bearing cover slide relative to each other. At this time, there are two rotating pairs moving, and the wear can be distributed to each rotating pair, thereby increasing the service life. The present invention provides a sliding bearing with a dustproof sealing structure to solve the problem that the sliding characteristics of the existing sliding bearings are reduced and the service life is short after the upper and lower shells and the sliding support parts are worn.

Description

Technical Field

[0001] The invention relates to the technical field of sliding bearings, and in particular to a sliding bearing with a dustproof sealing structure. Background Art

[0002] Bearings are elements used to support and guide rotating or moving parts, which can reduce energy loss and extend mechanical life. Shock absorber bearings are important components in the automobile suspension system, mainly used to reduce direct friction between the vehicle body and the axle. Sliding bearings include radial bearings, thrust bearings and bidirectional thrust bearings. Radial bearings bear pure radial forces and are suitable for intermittent work at low speeds and heavy loads. Thrust bearings bear pure axial forces and are suitable for intermittent work at low speeds and heavy loads. Bidirectional thrust bearings can bear axial and radial forces at the same time and are suitable for intermittent work at low speeds and heavy loads. Considering the characteristics of shock absorber bearings bearing axial and radial forces and working under low speed and heavy load environments, it is best to choose bidirectional thrust bearings.

[0003] Bidirectional thrust bearings can be made of synthetic resins, such as the following materials: POM (polyoxymethylene resin) is a linear polymer with high density, high crystallinity and no side chains. It is called Saigang or Duogang and is the third largest general engineering plastic. The friction coefficient of POM (polyoxymethylene resin) is 0.31 and the compressive strength is 120MPa. PP (polypropylene) is a polymer made by polyaddition reaction of propylene. It has high density and high crystallinity and is known as one of the lightest general plastics. The friction coefficient of PP is 0.51 and the compressive strength is 50MPa. PA6 (nylon 6) is an engineering plastic with excellent mechanical properties, wear resistance and heat resistance. It is a polyamide made by polycondensation reaction of caprolactam and caprolactone. The friction coefficient of PA6 is 0.6 and the compressive strength is 90MPa.

[0004] For example, the Chinese invention patent with the announcement number CN108350946B provides a synthetic resin sliding bearing, which includes an upper shell of synthetic resin, a lower shell of synthetic resin, and a thrust sliding support part of synthetic resin arranged in the annular space between the upper shell and the lower shell, which can avoid the radial mutual pressing contact on the surface of the upper shell and the lower shell to cause interference. However, after working for a long time, the upper shell, the lower shell and the sliding support part are worn, resulting in a reduction in lubricating grease between the upper shell, the lower shell and the sliding support part, which in turn affects the rotation of the sliding bearing. Summary of the invention

[0005] The invention provides a sliding bearing with a dustproof sealing structure to solve the problem that the sliding characteristics of the existing sliding bearings are reduced and the service life is short after the upper and lower shells and the sliding support parts are worn.

[0006] The sliding bearing with a dustproof seal structure of the present invention adopts the following technical solution: the sliding bearing with a dustproof seal structure comprises a bearing seat, a bearing cover, a ring member and an adjustment mechanism. The bearing seat is rotatably arranged on the bearing cover, a first ring piece is fixedly arranged on the bearing seat, a second ring piece is fixedly arranged on the bearing cover, the first ring piece and the second ring piece are arranged oppositely, the first ring piece and the second ring piece are coaxially arranged and can rotate relatively, and an installation cavity is formed between the first ring piece and the second ring piece.

[0007] The annular member is rotatably arranged in the installation cavity, and the annular member and the first ring sheet are coaxially arranged. The annular member includes a first support assembly and a second support assembly, and the first support assembly and the second support assembly are sequentially distributed along the axial direction of the annular member. The first support assembly includes a first arc plate and two first retaining rings, and the two first retaining rings are respectively fixedly arranged on the inner and outer side walls of the first arc plate. Along the axial direction of the first retaining ring, the two sides of the first retaining ring are respectively the first side and the second side, and the first side of the first retaining ring abuts against the bearing seat.

[0008] The second support assembly includes a second arc plate and two second retaining rings, and the two second retaining rings are fixedly arranged on the inner and outer side walls of the second arc plate respectively. The concave surfaces of the first arc plate and the second arc plate are arranged opposite to each other, and an annular cavity is formed between the first arc plate and the second arc plate, a first cavity is formed between the convex surface of the first arc plate and the bearing seat, and a second cavity is formed between the convex surface of the second arc plate and the bearing cover. A plurality of flow channels are provided on the second arc plate.

[0009] Along the axial direction of the second ring sheet, the two sides of the second retaining ring are the third side and the fourth side respectively, the third side of the second retaining ring abuts against the second side of the first retaining ring, the fourth side of the second retaining ring abuts against the bearing cover, and a plurality of supporting protrusions are fixedly arranged on the third side of the second retaining ring. Lubricating grease is arranged in the installation cavity, the annular cavity, the first cavity and the second cavity.

[0010] The adjusting mechanism comprises an adjusting ring, which is arranged in the annular cavity, and is fixedly connected to the first arc-shaped plate. The adjusting ring comprises a plurality of wedge-shaped plates, and the plurality of wedge-shaped plates are connected end to end in sequence.

[0011] Further, each wedge plate includes a first arc block and a second arc block, and along the circumference of the adjustment ring, the two sides of the second arc block are the fifth side and the sixth side, and the fifth sides of the first arc block and the second arc block are fixedly connected. Along the radial direction of the adjustment ring, the width of the first arc block is smaller than the width of the second arc block. Along the radial direction of the adjustment ring, the inner side wall and the outer side wall of the second arc block are respectively provided with first inclined surfaces, and along the direction of the second arc block from the fifth side to the sixth side, the two first inclined surfaces gradually move away from each other.

[0012] Furthermore, along the radial direction of the adjustment ring, sealing platforms are fixedly provided on the inner wall and the outer wall of the first arc block respectively.

[0013] Further, a first pressing convex ring is fixedly provided on one side of the first ring sheet, the first pressing convex ring is in the first cavity, and the first pressing convex ring is used to abut against the first arc plate. A second pressing convex ring is fixedly provided on one side of the second ring sheet, the second pressing convex ring is in the second cavity, and the second pressing convex ring is used to abut against the second arc plate.

[0014] Furthermore, along the radial direction of the first ring sheet, the inner side wall and the outer side wall of the first pressing convex ring are respectively provided with second inclined surfaces, and along the direction from the first ring sheet to the second ring sheet, the two second inclined surfaces gradually approach each other. A third inclined surface is provided on the first side of each first retaining ring, and the third inclined surface and the second inclined surface are provided in parallel, and the third inclined surface and the second inclined surface are against each other.

[0015] Along the radial direction of the second ring piece, the inner side wall and the outer side wall of the second pressing convex ring are respectively provided with fourth inclined surfaces, and along the direction from the second ring piece to the first ring piece, the two fourth inclined surfaces gradually approach each other. A fifth inclined surface is provided on the fourth side of each second retaining ring, and the fifth inclined surface is provided in parallel with the fourth inclined surface, and the fifth inclined surface and the fourth inclined surface are against each other.

[0016] Further, the first retaining ring includes a first vertical ring and a first oblique retaining ring. The first vertical ring and the first oblique retaining ring are fixedly connected, and the first vertical ring and the first oblique retaining ring are sequentially distributed along the direction from the first side to the second side of the first retaining ring. The first oblique retaining ring is arranged obliquely, and along the direction from the first side to the second side of the first retaining ring, the first oblique retaining ring gradually approaches the adjusting ring, and a first sliding surface is arranged on one side of the first oblique retaining ring.

[0017] The second retaining ring includes a second vertical ring and a second oblique retaining ring. The second vertical ring and the second oblique retaining ring are fixedly connected, and the second vertical ring and the second oblique retaining ring are sequentially distributed along the direction from the fourth side to the third side of the second retaining ring. The second oblique retaining ring is tilted, and along the direction from the fourth side to the third side of the second retaining ring, the second oblique retaining ring gradually approaches the adjustment ring, and a second sliding surface is provided on one side of the second oblique retaining ring. The first oblique retaining ring and the second oblique retaining ring are deformable.

[0018] Furthermore, the second bevel retaining ring is also provided with a third sliding surface, the second sliding surface and the third sliding surface are sequentially distributed from the inside to the outside along the radial direction of the second bevel retaining ring, and the third sliding surface is provided with a plurality of conical surfaces, and the plurality of conical surfaces are distributed along the circumference of the second bevel retaining ring. The support protrusion is provided on the third sliding surface, and the plurality of support protrusions are distributed along the circumference of the second bevel retaining ring, and the plurality of conical surfaces and the plurality of support protrusions are distributed alternately. The support protrusion is used to abut against the first sliding surface.

[0019] Furthermore, a first sealing convex ring is fixedly arranged on the outer peripheral wall of the first ring piece, and a second sealing convex ring is fixedly arranged on the outer peripheral wall of the second ring piece. The second sealing convex ring and the first sealing convex ring are mutually buckled and can rotate relatively.

[0020] Further, two third sealing convex rings are fixedly provided on one side of the first ring sheet, the third sealing convex rings are in the installation cavity, and the two third sealing convex rings are respectively located on both sides of the first pressing convex ring. Two fourth sealing convex rings are fixedly provided on one side of the second ring sheet, the fourth sealing convex rings are in the installation cavity, and the two fourth sealing convex rings are respectively located on both sides of the second pressing convex ring. Each fourth sealing convex ring abuts against a third sealing convex ring.

[0021] Furthermore, a fifth sealing convex ring is fixedly arranged on the inner side wall of the first ring piece. A connecting pipe is fixedly arranged on the inner side wall of the second ring piece, the connecting pipe and the second ring piece are coaxially arranged, a sixth sealing convex ring is fixedly arranged on the connecting pipe, and the sixth sealing convex ring and the fifth sealing convex ring are against each other.

[0022] The beneficial effects of the present invention are as follows: the sliding bearing with a dustproof seal structure of the present invention is provided with a bearing seat, a bearing cover, an annular member and an adjusting mechanism. During normal operation, the sliding bearing with a dustproof seal structure is subjected to extrusion, and the first cavity and the second cavity are compressed to generate pressure as a thrust force to counteract the extrusion force on the bearing seat and the bearing cover. Since the friction between the second side of the first retaining ring and the supporting protrusion is relatively large, the first supporting assembly and the second supporting assembly do not slide relative to each other, and the bearing seat and the bearing cover rotate relative to the annular member.

[0023] When the lubricating grease in the first cavity and the second cavity leaks, the friction between the first retaining ring and the bearing seat increases, and the friction between the second retaining ring and the bearing cover increases. When the friction at the two places is greater than the friction between the second side of the first retaining ring and the support protrusion, at this time, relative sliding no longer occurs between the first retaining ring and the bearing seat, and relative sliding no longer occurs between the second retaining ring and the bearing cover. At this time, the first support assembly and the second support assembly slide relative to each other.

[0024] When the first support assembly rotates clockwise relative to the second support assembly, the first arc plate drives the adjustment ring to rotate clockwise synchronously, the wedge plate squeezes the lubricating grease in the annular cavity, and presses the lubricating grease in the annular cavity into the second cavity through the flow channel, thereby increasing the oil pressure in the second cavity, and relative sliding occurs between the second retaining ring and the bearing cover. At this time, the wear can be distributed between the first support assembly and the second support assembly, and between the second retaining ring and the bearing cover, thereby extending the service life of the sliding bearing with a dustproof sealing structure.

[0025] When the first support assembly rotates clockwise relative to the second support assembly, a negative pressure is formed in the annular cavity under the action of the wedge plate, and the lubricating grease leaked into the mounting cavity is sucked into the annular cavity through the gap between the second side of the first retaining ring and the support protrusion, thereby making full use of the lubricating grease to extend the service life of the sliding bearing with a dustproof sealing structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 A schematic structural diagram of a sliding bearing with a dustproof sealing structure provided by an embodiment of the present invention;

[0028] Figure 2 for Figure 1 Sectional view at AA in the middle;

[0029] Figure 3 A cross-sectional view of a partial structure of a sliding bearing with a dustproof seal structure provided by an embodiment of the present invention;

[0030] Figure 4 An exploded view of a sliding bearing with a dustproof seal structure provided by an embodiment of the present invention;

[0031] Figure 5 A partial cross-sectional view of a bearing seat of a sliding bearing with a dustproof seal structure provided by an embodiment of the present invention;

[0032] Figure 6 A partial cross-sectional view of a first supporting assembly of a sliding bearing with a dustproof sealing structure provided by an embodiment of the present invention;

[0033] Figure 7 A schematic structural diagram of an adjustment ring of a sliding bearing with a dustproof sealing structure provided by an embodiment of the present invention;

[0034] Figure 8 A partial cross-sectional view of a second support assembly of a sliding bearing with a dustproof seal structure provided by an embodiment of the present invention;

[0035] Fig. 9 A partial cross-sectional view of a bearing cover of a sliding bearing with a dustproof sealing structure provided in an embodiment of the present invention.

[0036] In the figure: 100, bearing seat; 110, first top pressure convex ring; 120, first sealing convex ring; 130, third sealing convex ring; 140, fifth sealing convex ring; 150, first ring piece; 170, installation cavity; 200, bearing cover; 210, second top pressure convex ring; 220, second sealing convex ring; 230, fourth sealing convex ring; 250, sixth sealing convex ring; 260, second ring piece; 270, first cavity; 280, second cavity; 300, annular member; 310, first A retaining ring; 311, a first oblique retaining ring; 320, a first arc plate; 330, a conical cavity; 350, a flow channel; 360, a conical surface; 370, a supporting protrusion; 380, a first sliding surface; 390, an annular cavity; 400, an adjusting ring; 410, a sealing platform; 430, a wedge plate; 431, a first arc block; 432, a second arc block; 4321, a first inclined surface; 510, a second retaining ring; 511, a second oblique retaining ring; 520, a second arc plate; 530, a third sliding surface. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] Reference Figures 1 to 9 As shown, a sliding bearing with a dustproof seal structure provided in an embodiment of the present invention comprises a bearing seat 100, a bearing cover 200, a ring member 300 and an adjustment mechanism. The bearing seat 100 is rotatably arranged on the bearing cover 200, a first ring piece 150 is fixedly arranged on the bearing seat 100, a second ring piece 260 is fixedly arranged on the bearing cover 200, the first ring piece 150 and the second ring piece 260 are arranged opposite to each other, the first ring piece 150 and the second ring piece 260 are coaxially arranged and can rotate relatively, and an installation cavity 170 is formed between the first ring piece 150 and the second ring piece 260.

[0039] The ring member 300 is rotatably disposed in the installation cavity 170, and the ring member 300 and the first ring sheet 150 are coaxially disposed. The ring member 300 includes a first support assembly and a second support assembly, and the first support assembly and the second support assembly are sequentially distributed along the axial direction of the ring member 300.

[0040] The first support assembly includes a first arc plate 320 and two first retaining rings 310. The first arc plate 320, the first retaining ring 310 and the first ring sheet 150 are coaxially arranged, and the two first retaining rings 310 are respectively fixedly arranged on the inner and outer side walls of the first arc plate 320. Along the axial direction of the first retaining ring 310, the two sides of the first retaining ring 310 are respectively the first side and the second side, and the first side of the first retaining ring 310 abuts against the bearing seat 100.

[0041] The second support assembly includes a second arc plate 520 and two second retaining rings 510. The second arc plate 520, the second retaining ring 510 and the second ring sheet 260 are coaxially arranged. The two second retaining rings 510 are respectively fixedly arranged on the inner and outer side walls of the second arc plate 520. The concave surfaces of the first arc plate 320 and the second arc plate 520 are arranged opposite to each other. An annular cavity 390 is formed between the first arc plate 320 and the second arc plate 520. A first cavity 270 is formed between the convex surface of the first arc plate 320 and the bearing seat 100, and a second cavity 280 is formed between the convex surface of the second arc plate 520 and the bearing cover 200. A plurality of flow channels 350 are opened on the second arc plate 520, and the plurality of flow channels 350 are distributed along the circumference of the second arc plate 520. The flow channels 350 connect the annular cavity 390 with the second cavity 280.

[0042] Along the axial direction of the second ring sheet 260, the two sides of the second retaining ring 510 are the third side and the fourth side respectively, the third side of the second retaining ring 510 abuts against the second side of the first retaining ring 310, the fourth side of the second retaining ring 510 abuts against the bearing cover 200, and a plurality of supporting protrusions 370 are fixedly arranged on the third side of the second retaining ring 510. Lubricating grease is arranged in the installation cavity 170, the annular cavity 390, the first cavity 270 and the second cavity 280.

[0043] The adjusting mechanism includes an adjusting ring 400 , which is disposed in the annular cavity 390 . The adjusting ring 400 is fixedly connected to the first arc plate 320 . The adjusting ring 400 includes a plurality of wedge plates 430 , which are connected end to end in sequence.

[0044] The rotation between the first retaining ring 310 and the bearing seat 100 is a revolving pair, the rotation between the first support assembly and the second support assembly is a revolving pair, and the rotation between the second retaining ring 510 and the bearing cover 200 is a revolving pair.

[0045] During normal operation, the sliding bearing with the dustproof seal structure is squeezed, and the first cavity 270 and the second cavity 280 are compressed to generate pressure as a thrust force to counteract the squeezing force on the bearing seat 100 and the bearing cover 200. Since the friction between the second side of the first retaining ring 310 and the support protrusion 370 is relatively large, the first support assembly and the second support assembly do not slide relative to each other, and the bearing seat 100 and the bearing cover 200 rotate relative to the annular member 300.

[0046] When the lubricating grease in the first cavity 270 and the second cavity 280 leaks, the friction between the first retaining ring 310 and the bearing seat 100 increases, and the friction between the second retaining ring 510 and the bearing cover 200 increases. When the friction at the two places is greater than the friction between the second side of the first retaining ring 310 and the support protrusion 370, at this time, there is no relative sliding between the first retaining ring 310 and the bearing seat 100, and there is no relative sliding between the second retaining ring 510 and the bearing cover 200. At this time, the first support assembly and the second support assembly slide relative to each other.

[0047] When the first support assembly rotates clockwise relative to the second support assembly, the first arc plate 320 drives the adjustment ring 400 to rotate clockwise synchronously, the wedge plate 430 squeezes the lubricating grease in the annular cavity 390, and presses the lubricating grease in the annular cavity 390 into the second cavity 280 through the flow channel 350, thereby increasing the oil pressure in the second cavity 280, and relative sliding occurs between the second retaining ring 510 and the bearing cover 200. At this time, there are two rotating pairs active, which can distribute the wear to each rotating pair, thereby extending the service life of the sliding bearing with a dustproof sealing structure.

[0048] When the first support assembly rotates clockwise relative to the second support assembly, under the action of the wedge plate 430, a negative pressure is formed in the annular cavity 390, and the lubricating grease leaked into the mounting cavity 170 is sucked into the annular cavity 390 through the gap between the second side of the first retaining ring 310 and the support protrusion 370, thereby making full use of the lubricating grease to extend the service life of the sliding bearing with the dustproof sealing structure.

[0049] In this embodiment, each wedge plate 430 includes a first arc block 431 and a second arc block 432. Along the circumference of the adjustment ring 400, the two sides of the second arc block 432 are the fifth side and the sixth side. The first arc block 431 and the fifth side of the second arc block 432 are fixedly connected. In two adjacent wedge plates 430, the first arc block 431 on one wedge plate 430 and the sixth side of the second arc block 432 on the other wedge plate 430 are fixedly connected. Along the radial direction of the adjustment ring 400, the width of the first arc block 431 is smaller than the width of the second arc block 432. Along the radial direction of the adjustment ring 400, the inner side wall and the outer side wall of the second arc block 432 are respectively provided with first inclined surfaces 4321, and along the direction from the fifth side to the sixth side of the second arc block 432, the two first inclined surfaces 4321 gradually move away from each other.

[0050] In this embodiment, along the radial direction of the adjustment ring 400, the inner wall and the outer wall of the first arc block 431 are respectively fixedly provided with a blocking platform 410. When the first support assembly rotates clockwise relative to the second support assembly, when the lubricating grease in the annular cavity 390 moves along the second arc block 432 from the fifth side to the sixth side, under the action of the first inclined surface 4321, the pressure of the lubricating grease gradually increases, thereby squeezing out the lubricating grease in the annular cavity 390. When the lubricating grease passes over one wedge plate 430 and reaches another wedge plate 430, the lubricating grease reaches the first arc block 431. Since the width of the first arc block 431 is smaller than the width of the second arc block 432, the pressure of the lubricating grease on the first arc block 431 is reduced, and negative pressure is generated here. When the first arc block 431 rotates at the flow channel 350, the sealing platform 410 blocks the flow channel 350 to prevent the negative pressure generated at the first arc block 431 from sucking the lubricating grease in the second cavity 280 into the annular cavity 390.

[0051] In this embodiment, a first pressing protrusion 110 is fixedly provided on one side of the first ring piece 150, the first pressing protrusion 110 and the first ring piece 150 are coaxially arranged, the first pressing protrusion 110 is in the first cavity 270, and the first pressing protrusion 110 is used to abut against the first arc plate 320. A second pressing protrusion 210 is fixedly provided on one side of the second ring piece 260, the second pressing protrusion 210 and the second ring piece 260 are coaxially arranged, the second pressing protrusion 210 is in the second cavity 280, and the second pressing protrusion 210 is used to abut against the second arc plate 520.

[0052] The sliding bearing with a dustproof sealing structure in normal working condition is squeezed, and the first pressing protrusion ring 110 and the second pressing protrusion ring 210 squeeze the lubricating grease in the first cavity 270 and the second cavity 280 respectively. The lubricating grease in the first cavity 270 and the second cavity 280 is compressed to generate pressure as a thrust force to counteract the squeezing force exerted on the bearing seat 100 and the bearing cover 200.

[0053] In this embodiment, along the radial direction of the first ring piece 150, the inner side wall and the outer side wall of the first pressing protruding ring 110 are respectively provided with second inclined surfaces, and along the direction from the first ring piece 150 to the second ring piece 260, the two second inclined surfaces gradually approach each other. A third inclined surface is provided on the first side of each first retaining ring 310, and the third inclined surface and the second inclined surface are provided in parallel, and the third inclined surface and the second inclined surface are abutted against each other.

[0054] Along the radial direction of the second ring piece 260, fourth inclined surfaces are respectively provided on the inner side wall and the outer side wall of the second pressing protruding ring 210, and the two fourth inclined surfaces gradually approach each other along the direction from the second ring piece 260 to the first ring piece 150. A fifth inclined surface is provided on the fourth side of each second retaining ring 510, and the fifth inclined surface is provided in parallel with the fourth inclined surface, and the fifth inclined surface and the fourth inclined surface are against each other.

[0055] In this embodiment, the first retaining ring 310 includes a first vertical ring and a first oblique retaining ring 311. The first vertical ring and the first oblique retaining ring 311 are fixedly connected, and the first vertical ring and the first oblique retaining ring 311 are sequentially distributed along the direction from the first side to the second side of the first retaining ring 310. The first oblique retaining ring 311 is arranged obliquely, and along the direction from the first side to the second side of the first retaining ring 310, the first oblique retaining ring 311 gradually approaches the adjusting ring 400, and a first sliding surface 380 is arranged on one side of the first oblique retaining ring 311.

[0056] The second retaining ring 510 includes a second vertical ring and a second oblique retaining ring 511. The second vertical ring and the second oblique retaining ring 511 are fixedly connected, and the second vertical ring and the second oblique retaining ring 511 are sequentially distributed along the direction from the fourth side to the third side of the second retaining ring 510. The second oblique retaining ring 511 is tilted, and along the direction from the fourth side to the third side of the second retaining ring 510, the second oblique retaining ring 511 gradually approaches the adjustment ring 400, and a second sliding surface is provided on one side of the second oblique retaining ring 511. The first sliding surface 380 and the second sliding surface are against each other, and the first oblique retaining ring 311 and the second oblique retaining ring 511 form a conical cavity 330, and the conical cavity 330 is in the installation cavity. The first oblique retaining ring 311 and the second oblique retaining ring 511 are deformable.

[0057] In this embodiment, the second bevel retaining ring 511 is further provided with a third sliding surface 530, and the second sliding surface and the third sliding surface 530 are sequentially distributed from the inside to the outside along the radial direction of the second bevel retaining ring 511, and a plurality of tapered surfaces 360 are provided on the third sliding surface 530, and the plurality of tapered surfaces 360 are distributed along the circumference of the second bevel retaining ring 511. The support protrusions 370 are provided on the third sliding surface 530, and the plurality of support protrusions 370 are distributed along the circumference of the second bevel retaining ring 511, and the plurality of tapered surfaces 360 and the plurality of support protrusions 370 are alternately distributed. The support protrusions 370 are used to abut against the first sliding surface 380. Each tapered surface 360 ​​is arranged obliquely, and along the radial direction of the second bevel retaining ring 511, the side of the tapered surface 360 ​​away from the axis of the second bevel retaining ring 511 gradually moves away from the first sliding surface 380.

[0058] On the one hand, the support protrusion 370 can increase the friction between the first sliding surface 380 and the third sliding surface 530. On the other hand, the support protrusion 370 supports between the first sliding surface 380 and the third sliding surface 530, reduces the pressure between the first sliding surface 380 and the third sliding surface 530, and facilitates the lubricating grease in the installation cavity 170 to enter the annular cavity 390.

[0059] When the sliding bearing with a dustproof sealing structure in normal working condition is squeezed, the first beveled retaining ring 311 and the second beveled retaining ring 511 are slightly deformed after being compressed, the axial inclination angle of the first beveled retaining ring 311 relative to the first ring plate 150 increases, and the axial inclination angle of the second beveled retaining ring 511 relative to the second retaining ring 510 increases. The clamping force between the first beveled retaining ring 311 and the second beveled retaining ring 511 gradually increases, which can prevent the lubricating grease in the annular cavity 390 from leaking out from between the first beveled retaining ring 311 and the second beveled retaining ring 511, thereby realizing the unidirectional flow of the lubricating grease.

[0060] In this embodiment, a first sealing convex ring 120 is fixedly disposed on the outer peripheral wall of the first ring piece 150, and the first sealing convex ring 120 and the first ring piece 150 are coaxially disposed. A second sealing convex ring 220 is fixedly disposed on the outer peripheral wall of the second ring piece 260, and the second sealing convex ring 220 and the second ring piece 260 are coaxially disposed, and the second sealing convex ring 220 and the first sealing convex ring 120 are mutually buckled and can rotate relatively. The second sealing convex ring 220 and the first sealing convex ring 120 play the role of connecting the bearing seat 100 and the bearing cover 200.

[0061] In this embodiment, two third sealing convex rings 130 are fixedly provided on one side of the first ring piece 150, the third sealing convex ring 130 and the first ring piece 150 are coaxially arranged, the third sealing convex ring 130 is located in the installation cavity 170, the two third sealing convex rings 130 are distributed in sequence from the inside to the outside, and the two third sealing convex rings 130 are respectively located on both sides of the first top pressure convex ring 110.

[0062] Two fourth sealing protrusions 230 are fixedly arranged on one side of the second ring piece 260. The fourth sealing protrusion 230 and the second ring piece 260 are coaxially arranged. The fourth sealing protrusion 230 is located in the installation cavity 170. The two fourth sealing protrusions 230 are sequentially distributed from the inside to the outside, and the two fourth sealing protrusions 230 are respectively located on both sides of the second pressing protrusion 210. Each fourth sealing protrusion 230 is against a third sealing protrusion 130. The third sealing protrusion 130 and the fourth sealing protrusion 230 play a further role in sealing and dust prevention.

[0063] In this embodiment, a fifth sealing convex ring 140 is fixedly arranged on the inner side wall of the first ring piece 150. A connecting pipe is fixedly arranged on the inner side wall of the second ring piece 260, the connecting pipe and the second ring piece 260 are coaxially arranged, and a sixth sealing convex ring 250 is fixedly arranged on the connecting pipe, and the sixth sealing convex ring 250 and the fifth sealing convex ring 140 are abutted. The first sealing convex ring 120, the second sealing convex ring 220, the third sealing convex ring 130 and the fourth sealing convex ring 230 form a labyrinth seal, which ensures sealing while having a low cost.

[0064] The materials of the bearing seat 100, the bearing cover 200 and the ring part 300 are all synthetic resins. The bearing seat 100 is made of modified POM, which has the characteristics of low friction coefficient, small wear and self-lubrication. It mainly provides the friction working surface and interface size for the bearing. According to the requirements of the bearing cover 200 for support and self-lubrication, POM material is the best material for the bearing cover 200, followed by PA6. The ring part 300 has a similar function to the bearing cover 200, but it and the bearing cover 200 are friction pairs, so the same material should be avoided as much as possible, so PP is the best material for the ring part 300, followed by PA6.

[0065] Working process: including normal working state, leakage state and wear state.

[0066] Normal working state: The sliding bearing with a dustproof sealing structure in normal working state is squeezed, the bearing seat 100 and the bearing cover 200 squeeze the annular member 300, and the lubricating grease in the first cavity 270 and the second cavity 280 is compressed to generate pressure as a thrust force to counteract the squeezing force exerted on the bearing seat 100 and the bearing cover 200.

[0067] The first beveled retaining ring 311 and the second beveled retaining ring 511 are slightly deformed after being compressed, the axial inclination angle of the first beveled retaining ring 311 relative to the first ring sheet 150 increases, the axial inclination angle of the second beveled retaining ring 511 relative to the second retaining ring 510 increases, and the pressing force between the first beveled retaining ring 311 and the second beveled retaining ring 511 gradually increases, thereby buffering the external impact load and preventing the lubricating grease in the annular cavity 390 from leaking from between the first beveled retaining ring 311 and the second beveled retaining ring 511. Since the friction between the first sliding surface 380 and the supporting protrusion 370 is relatively large, at this time, the first support assembly and the second support assembly do not slide relative to each other, and the bearing seat 100 and the bearing cover 200 rotate relative to the annular member 300.

[0068] Leakage state: After the sliding bearing with dustproof seal structure works for a long time, the lubricating grease in the first cavity 270 will leak out from the gap between the second bevel and the third bevel, and the lubricating grease in the second cavity 280 will leak out from the gap between the fourth bevel and the fifth bevel. At this time, it is in the leakage state. The lubricating grease leaked from the first cavity 270 and the second cavity 280 enters the installation cavity 170 and enters the tapered cavity 330.

[0069] After the lubricating grease in the first cavity 270 leaks out, the pressure between the first retaining ring 310 and the bearing seat 100 increases, and the pressure between the second retaining ring 510 and the bearing cover 200 increases, thereby increasing the sliding friction. When the friction between the first retaining ring 310 and the bearing seat 100, and the friction between the second retaining ring 510 and the bearing cover 200 are greater than the friction between the support protrusion 370 and the first sliding surface 380, the first retaining ring 310 and the bearing seat 100 no longer slide relative to each other, and the second retaining ring 510 and the bearing cover 200 no longer slide relative to each other. At this time, the bearing seat 100 drives the first retaining ring 310 to rotate synchronously, and the bearing cover 200 drives the second retaining ring 510 to rotate synchronously, and the first support assembly and the second support assembly slide relative to each other.

[0070] When the first support assembly rotates clockwise relative to the second support assembly, the first arc plate 320 drives the adjustment ring 400 to rotate clockwise synchronously, and the first inclined surface 4321 of each second arc block 432 in the adjustment ring 400 squeezes the lubricating grease in the annular cavity 390. The lubricating grease in the annular cavity 390 moves under the push of the adjustment ring 400. Under the action of the first inclined surface 4321, the lubricating grease in the annular cavity 390 is squeezed into the second cavity 280 through the flow channel 350, thereby increasing the oil pressure in the second cavity 280 and reducing the friction between the second retaining ring 510 and the bearing cover 200, thereby causing relative sliding between the second retaining ring 510 and the bearing cover 200.

[0071] At this time, the first support assembly and the second support assembly slide relative to each other, and the second retaining ring 510 and the bearing cover 200 slide relative to each other. In this way, there are two rotating pairs, which can distribute the wear to each rotating pair and extend the service life of the sliding bearing with a dustproof sealing structure.

[0072] When the first support assembly rotates counterclockwise relative to the second support assembly, the first arc plate 320 drives the adjustment ring 400 to rotate counterclockwise synchronously, and the lubricating grease in the annular cavity 390 moves under the push of the adjustment ring 400. The lubricating grease in the annular cavity 390 moves along the second arc block 432 from the sixth side to the fifth side. Under the action of the first inclined surface 4321, the space where the lubricating grease is located increases, and the pressure of the lubricating grease gradually decreases. Negative pressure is generated at the two first inclined surfaces 4321 of the second arc block 432, and a small amount of lubricating grease escaping into the installation cavity 170 is first sucked into the conical cavity 330 and the conical surface 360, and then the lubricating grease in the conical cavity 330 and the conical surface 360 ​​is sucked into the annular cavity 390 from between the first sliding surface 380 and the second sliding surface. At this time, the first support assembly and the second support assembly slide relative to each other, and the first retaining ring 310 and the bearing seat 100 no longer slide relative to each other, and the second retaining ring 510 and the bearing cover 200 no longer slide relative to each other.

[0073] Wear state: When the second retaining ring 510 and the bearing cover 200 are in contact for a long time and the fourth inclined surface of the second retaining ring 510 is worn, the second pressing protruding ring 210 will press the second retaining ring 510 tightly, and the second pressing protruding ring 210 and the second arc plate 520 will abut against each other to block the flow channel 350. After the second pressing protruding ring 210 and the second arc plate 520 abut against each other, the curvature of the second arc plate 520 becomes smaller, so that the volume of the second cavity 280 is reduced, the pressure of the lubricating grease in the second cavity 280 is increased, and the lubricating grease in the annular cavity 390 no longer flows out of the flow channel 350.

[0074] The first support assembly rotates counterclockwise relative to the second support assembly, the pressure between the first sliding surface 380 and the support protrusion 370 is reduced, the first support assembly and the second support assembly slide relative to each other, the first retaining ring 310 and the bearing seat 100 no longer slide relative to each other, and the second retaining ring 510 and the bearing cover 200 no longer slide relative to each other. At this time, even if the sliding bearing with the dustproof seal structure is severely worn, there is still a rotating pair that can move, thereby further extending the service life of the sliding bearing with the dustproof seal structure.

[0075] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A sliding bearing with a dustproof seal structure, characterized in that: It comprises a bearing seat, a bearing cover, a ring member and an adjustment mechanism; the bearing seat is rotatably arranged on the bearing cover, a first ring piece is fixedly arranged on the bearing seat, a second ring piece is fixedly arranged on the bearing cover, the first ring piece and the second ring piece are arranged opposite to each other, the first ring piece and the second ring piece are coaxially arranged and can rotate relative to each other, and a mounting cavity is formed between the first ring piece and the second ring piece; The annular member is rotatably arranged in the installation cavity, and the annular member and the first ring sheet are coaxially arranged; the annular member includes a first support assembly and a second support assembly, and the first support assembly and the second support assembly are sequentially distributed along the axial direction of the annular member; the first support assembly includes a first arc plate and two first retaining rings, and the two first retaining rings are respectively fixedly arranged on the inner and outer side walls of the first arc plate; along the axial direction of the first retaining ring, the two sides of the first retaining ring are respectively the first side and the second side, and the first side of the first retaining ring abuts against the bearing seat; The second support assembly includes a second arc-shaped plate and two second retaining rings, the two second retaining rings are respectively fixedly arranged on the inner and outer side walls of the second arc-shaped plate; the concave surfaces of the first arc-shaped plate and the second arc-shaped plate are arranged opposite to each other, an annular cavity is formed between the first arc-shaped plate and the second arc-shaped plate, a first cavity is formed between the convex surface of the first arc-shaped plate and the bearing seat, and a second cavity is formed between the convex surface of the second arc-shaped plate and the bearing cover; a plurality of flow channels are opened on the second arc-shaped plate; Along the axial direction of the second ring sheet, the two sides of the second retaining ring are the third side and the fourth side respectively, the third side of the second retaining ring abuts against the second side of the first retaining ring, the fourth side of the second retaining ring abuts against the bearing cover, and a plurality of supporting protrusions are fixedly arranged on the third side of the second retaining ring; lubricating grease is arranged in the installation cavity, the annular cavity, the first cavity and the second cavity; The adjusting mechanism comprises an adjusting ring, which is arranged in the annular cavity, and the adjusting ring is fixedly connected to the first arc-shaped plate, and the adjusting ring comprises a plurality of wedge-shaped plates, and the plurality of wedge-shaped plates are connected end to end in sequence; The first retaining ring comprises a first vertical ring and a first oblique retaining ring; the first vertical ring and the first oblique retaining ring are fixedly connected, and the first vertical ring and the first oblique retaining ring are sequentially distributed along the direction from the first side to the second side of the first retaining ring; the first oblique retaining ring is arranged obliquely, and along the direction from the first side to the second side of the first retaining ring, the first oblique retaining ring gradually approaches the adjusting ring, and a first sliding surface is arranged on one side of the first oblique retaining ring; The second retaining ring comprises a second vertical ring and a second oblique retaining ring; the second vertical ring and the second oblique retaining ring are fixedly connected, and the second vertical ring and the second oblique retaining ring are sequentially distributed along the direction from the fourth side to the third side of the second retaining ring; the second oblique retaining ring is tilted, and along the direction from the fourth side to the third side of the second retaining ring, the second oblique retaining ring gradually approaches the adjusting ring, and a second sliding surface is arranged on one side of the second oblique retaining ring; the first oblique retaining ring and the second oblique retaining ring are deformable; A third sliding surface is also provided on the second bevel retaining ring. The second sliding surface and the third sliding surface are sequentially distributed from the inside to the outside along the radial direction of the second bevel retaining ring. A plurality of conical surfaces are provided on the third sliding surface. The plurality of conical surfaces are distributed along the circumference of the second bevel retaining ring. The support protrusion is provided on the third sliding surface. The plurality of support protrusions are distributed along the circumference of the second bevel retaining ring, and the plurality of conical surfaces and the plurality of support protrusions are distributed alternately. The support protrusion is used to counteract the first sliding surface.

2. The sliding bearing with a dustproof seal structure according to claim 1, characterized in that: Each wedge plate includes a first arc block and a second arc block. Along the circumference of the adjustment ring, the two sides of the second arc block are the fifth side and the sixth side, and the fifth sides of the first arc block and the second arc block are fixedly connected; along the radial direction of the adjustment ring, the width of the first arc block is smaller than the width of the second arc block; along the radial direction of the adjustment ring, first inclined surfaces are respectively provided on the inner side wall and the outer side wall of the second arc block, and along the direction from the fifth side to the sixth side of the second arc block, the two first inclined surfaces gradually move away from each other.

3. The sliding bearing with a dustproof seal structure according to claim 2, characterized in that: Along the radial direction of the adjusting ring, sealing platforms are fixedly arranged on the inner wall and the outer wall of the first arc block respectively.

4. The sliding bearing with a dustproof seal structure according to claim 1, characterized in that: A first pressing convex ring is fixedly provided on one side of the first ring piece, the first pressing convex ring is located in the first cavity, and the first pressing convex ring is used to resist the first arc plate; a second pressing convex ring is fixedly provided on one side of the second ring piece, the second pressing convex ring is located in the second cavity, and the second pressing convex ring is used to resist the second arc plate.

5. The sliding bearing with a dustproof seal structure according to claim 4, characterized in that: Along the radial direction of the first ring sheet, the inner side wall and the outer side wall of the first pressing convex ring are respectively provided with second inclined surfaces, and along the direction from the first ring sheet to the second ring sheet, the two second inclined surfaces gradually approach each other; a third inclined surface is provided on the first side of each first retaining ring, and the third inclined surface and the second inclined surface are arranged in parallel, and the third inclined surface and the second inclined surface are butted against each other; Along the radial direction of the second ring piece, fourth inclined surfaces are respectively provided on the inner wall and the outer wall of the second top pressure convex ring, and along the direction from the second ring piece to the first ring piece, the two fourth inclined surfaces gradually approach each other; a fifth inclined surface is provided on the fourth side of each second retaining ring, and the fifth inclined surface is parallel to the fourth inclined surface, and the fifth inclined surface and the fourth inclined surface are against each other.

6. The sliding bearing with a dustproof seal structure according to claim 1, characterized in that: A first sealing convex ring is fixedly arranged on the outer peripheral wall of the first ring piece, and a second sealing convex ring is fixedly arranged on the outer peripheral wall of the second ring piece. The second sealing convex ring and the first sealing convex ring are buckled with each other and can rotate relatively.

7. The sliding bearing with a dustproof seal structure according to claim 4, characterized in that: Two third sealing convex rings are fixedly arranged on one side of the first ring sheet, the third sealing convex rings are located in the installation cavity, and the two third sealing convex rings are respectively located on both sides of the first pressing convex ring; Two fourth sealing convex rings are fixedly arranged on one side of the second ring sheet. The fourth sealing convex rings are located in the installation cavity and are respectively located on both sides of the second pressing convex ring; each fourth sealing convex ring is against a third sealing convex ring.

8. The sliding bearing with a dustproof seal structure according to claim 1, characterized in that: A fifth sealing convex ring is fixedly arranged on the inner side wall of the first ring piece; a connecting pipe is fixedly arranged on the inner side wall of the second ring piece, the connecting pipe and the second ring piece are coaxially arranged, a sixth sealing convex ring is fixedly arranged on the connecting pipe, and the sixth sealing convex ring and the fifth sealing convex ring are abutted against each other.

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