Self-aligning bearing capable of realizing high bearing capacity and free of maintenance

Abstract

The utility model relates to a self-aligning bearing, and provides a self-aligning bearing which can realize high bearing capacity and is maintenance-free in order to solve the problems of small self-aligning amount, high processing cost, low limit rotating speed, high assembly requirement or low bearing capacity of the conventional self-aligning bearing. The bearing comprises an annular outer ring, an annular inner ring arranged in the outer ring, a retainer arranged on the inner surface of the inner ring, a plurality of rollers arranged on the retainer, an O-shaped sealing ring, a lip-shaped oil seal, a sealing ring and a self-lubricating gasket, each roller is in a cylindrical shape; annular first grooves are formed in the two sides of the inner raceway of the outer ring; annular third grooves are formed in the two sides of the inner raceway of the inner ring; the lip-shaped oil seal comprises a first metal framework layer and a first sealing layer arranged on the first metal framework layer; the sealing ring comprises a second metal framework layer and a second sealing layer arranged outside the second metal framework layer; and the self-lubricating gasket is arranged between the inner raceway of the outer ring and the outer raceway of the inner ring.

Description

Technical Field

[0001] The utility model relates to a self-aligning bearing, in particular to a self-aligning bearing which can realize high load-bearing and maintenance-free. Background Art

[0002] The spherical bearing is a bearing that can adapt to the angular deviation between the axis lines of the two raceways and has angular motion. Existing spherical bearings are mainly divided into spherical roller bearings and spherical ball bearings. Spherical roller bearings have the disadvantages of small spherical adjustment, high processing cost, low maximum speed, and high assembly requirements; spherical ball bearings have the disadvantage of low load-bearing capacity; at the same time, both are limited by the structure, and cannot effectively meet the actual needs under the working conditions of large spherical adjustment, high speed, heavy dust, high load, and easy disassembly.

[0003] Chinese patent CN102135133A discloses a sealed single-row cylindrical roller bearing, which is composed of a rolling element and a cage assembly between an outer ring and an inner ring. The two end faces between the outer ring and the inner ring adopt a sealing structure to seal the grease in the rolling element and the cage; the sealing structure is fastened in the sealing grooves arranged on both sides of the inner raceway of the outer ring to prevent the grease from being thrown out; the sealing structure is non-contact or lightly contacted with the sealing ring sheet assembly structure arranged on both sides of the outer raceway of the inner ring to reduce the friction generated by the inner ring during rotation and prevent dust, cutting fluid and impurities from entering the rolling element and the cage. The sealed single-row cylindrical roller bearing can seal the grease in the bearing to prevent the grease from being lost, has good sealing effect and low noise, prevents dust, cutting fluid and other impurities from entering the bearing, and prolongs the service life of the bearing. However, the disadvantage is that the bearing capacity cannot meet the actual demand. Utility Model Content

[0004] The utility model aims to solve the problems of small self-aligning amount, high processing cost, low limit speed, high assembly requirement or low bearing capacity of existing self-aligning bearings, and to provide a self-aligning bearing which can realize high load and is maintenance-free.

[0005] To achieve the above purpose, the technical solution provided by the utility model is:

[0006] A self-aligning bearing capable of achieving high load-bearing and maintenance-free includes an annular outer ring arranged in a bearing seat, an annular inner ring arranged in the outer ring, a cage arranged in the inner ring, and a plurality of rollers arranged on the cage, wherein the plurality of rollers are circumferentially distributed between an inner raceway of the inner ring and a core shaft, and the special features thereof are:

[0007] It also includes O-rings, lip seals, sealing rings and self-lubricating gaskets;

[0008] Lubricating grease is filled between each of the rollers and the cage, and between each of the rollers and the inner raceway of the inner ring;

[0009] The shape and size of each roller are the same, and each roller is cylindrical; both ends of the inner raceway of the outer ring are provided with an annular first groove; both ends of the inner raceway of the inner ring are provided with an annular third groove; two parallel annular second grooves are symmetrically provided on the outer surface of the outer ring relative to the radial midplane of the outer ring; there are two O-rings, and the two O-rings are respectively provided in the two second grooves;

[0010] The lip oil seal comprises a first metal skeleton layer and a first sealing layer wrapped outside the first metal skeleton layer, the radial outer side of the lip oil seal is embedded in the first groove, and the radial inner side of the lip oil seal contacts the outer surface of the inner ring;

[0011] The sealing ring comprises a second metal skeleton layer and a second sealing layer wrapped outside the second metal skeleton layer, the radial outer side of the sealing ring is embedded in the third groove, and the radial inner side of the sealing ring is used to contact the core shaft;

[0012] The self-lubricating gasket is annular and arranged between the inner raceway of the outer ring and the outer raceway of the inner ring; both ends of the inner raceway of the outer ring and the two first grooves are respectively provided with annular raised ribs for limiting the self-lubricating gasket.

[0013] Furthermore, the center axis of each roller is parallel to the center axis of the self-aligning bearing.

[0014] Furthermore, the cross-section of the first metal skeleton layer of the lip-shaped oil seal is L-shaped, the short side end of the L-shape is arranged in the first groove, and an annular fifth groove is arranged on the end surface of the first sealing layer on the side of the long side of the L-shape away from the first groove; a sixth groove is arranged on the radial inner side of the first sealing layer, and the lip-shaped oil seal has an interference fit with the outer raceway of the inner ring.

[0015] Furthermore, the cross section of the second metal skeleton layer of the sealing ring is L-shaped, a fourth groove is provided in the middle of the radial inner side of the second sealing layer, and the radial inner side of the second sealing layer is serrated.

[0016] Furthermore, the material of the first sealing layer is hydrogenated nitrile rubber.

[0017] Furthermore, the second sealing layer is made of polytetrafluoroethylene.

[0018] Furthermore, the self-lubricating liner is made of polyester fiber and polytetrafluoroethylene fiber woven by a plain weave mixed weaving process, and is bonded to the inner raceway of the outer ring by a dipping process.

[0019] Furthermore, the fourth groove is filled with grease.

[0020] Furthermore, the rib and the inner ring are clearance-fitted.

[0021] Furthermore, the number of the rollers is fourteen.

[0022] Compared with the prior art, the beneficial effects of the utility model are:

[0023] 1. The self-aligning bearing provided by the utility model can realize high load and maintenance-free. Its lip oil seal and sealing ring are both structures with metal skeletons, which can reduce the deformation of the components themselves, effectively prevent them from coming out under harsh working conditions, and also enhance the dustproof performance; at the same time, the multiple rollers distributed circumferentially can withstand large radial loads, and the design of the outer ring and the inner ring allows the outer ring to withstand a certain axial force. The axial force borne by the outer ring can be converted into the radial force of the roller after being converted through the outer and inner raceways of the inner ring, and the load-bearing capacity is high;

[0024] 2. The self-aligning bearing provided by the utility model can realize high load and maintenance-free. The material of the first sealing layer is hydrogenated nitrile rubber, which can meet the working temperature range of -40℃~+120℃; the material of the second sealing layer is polytetrafluoroethylene, and the self-lubricating liner is a material of polyester fiber and polytetrafluoroethylene fiber woven by plain weave mixed process, which ensures strength;

[0025] 3. The utility model provides a self-aligning bearing that can achieve high load-bearing and maintenance-free. The lip oil seal adopts a double dustproof lip design. The lip and the inner ring adopt a small interference fit, which can effectively prevent particulate impurities and dust from entering;

[0026] 4. The utility model provides a self-aligning bearing that can achieve high load and maintenance-free. The sealing ring adopts a double-lip design with a fourth groove in the middle, which can effectively prevent foreign matter from entering the bearing and prevent the grease inside the bearing from leaking; the lip is serrated, which can reduce the contact area with the core shaft, reduce the rotation torque and friction heat;

[0027] 5. The self-aligning bearing provided by the utility model can realize high load and maintenance-free. The grease filled between the roller and the cage and the self-lubricating liner have their own self-lubricating properties, which ensure that the bearing does not require external lubrication during operation and realizes the maintenance-free function within the working life;

[0028] 6. The self-aligning bearing provided by the utility model can achieve high load and maintenance-free, and combines the design concepts of sliding bearings and rolling bearings, and can meet the working conditions of large self-alignment, high speed, heavy dust, high load, and easy disassembly. It achieves excellent performances such as self-adjustment, creep resistance, and maintenance-free, which expands the mechanical properties of the product and expands the scope of use of the product;

[0029] 7. The utility model provides a high-load-bearing and maintenance-free self-aligning bearing. After the outer ring is assembled on the bearing seat, the bearing seat can swing ±15° relative to the axis of the core shaft or rotate at a low speed in the coaxial direction to achieve the large self-aligning function of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A cross-sectional view of an embodiment of the utility model of a self-aligning bearing capable of achieving high load-bearing and maintenance-free operation;

[0031] Figure 2 for Figure 1 A magnified image of point A;

[0032] Figure 3 This is a cross-sectional view of a sealing ring in an embodiment of the self-aligning bearing that can achieve high load-bearing capacity and maintenance-free in the utility model;

[0033] Figure 4 It is an assembly diagram of an embodiment of the self-aligning bearing that can achieve high load-bearing capacity and maintenance-free according to the utility model;

[0034] Description of reference numerals:

[0035] 1-outer ring, 2-inner ring, 3-roller, 4-cage, 5-O-ring, 6-lip oil seal, 61-first metal skeleton layer, 62-first sealing layer, 7-sealing ring, 71-second metal skeleton layer, 72-second sealing layer, 8-self-lubricating gasket, 9-core shaft, 10-bearing seat, 11-first groove, 12-rib, 13-second groove, 14-third groove, 15-fourth groove, 16-fifth groove, 17-sixth groove. DETAILED DESCRIPTION

[0036] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0037] A self-aligning bearing that can achieve high load capacity and is maintenance-free, see Figure 1 to Figure 4 , comprising an annular outer ring 1 arranged in a bearing seat 10, an annular inner ring 2 arranged in the outer ring 1, a cage 4 arranged in the inner ring 2, and fourteen rollers 3 arranged on the cage 4, the fourteen rollers 3 are evenly distributed in the circumferential direction between the inner raceway of the inner ring 2 and the core shaft 9, as well as an O-ring 5, a lip oil seal 6, a sealing ring 7 and a self-lubricating gasket 8;

[0038] Each roller 3 has the same shape and size, and each roller 3 is cylindrical; both ends of the inner raceway of the outer ring 1 are provided with an annular first groove 11; both ends of the inner raceway of the inner ring 2 are provided with an annular third groove 14; two parallel annular second grooves 13 are symmetrically provided on the outer surface of the outer ring 1 relative to the radial midplane of the outer ring 1; there are two O-type sealing rings 5, and the two O-type sealing rings 5 ​​are respectively provided in the two second grooves 13;

[0039] In this embodiment, the lip oil seal 6 includes a first metal skeleton layer 61 and a first sealing layer 62 wrapped outside the first metal skeleton layer 61, the radial outer side of the lip oil seal 6 is embedded in the first groove 11, and the radial inner side of the lip oil seal 6 contacts the outer surface of the inner ring 2; the sealing ring 7 includes a second metal skeleton layer 71 and a second sealing layer 72 wrapped outside the second metal skeleton layer 71, the radial outer side of the sealing ring 7 is embedded in the third groove 14, and the radial inner side of the sealing ring 7 is used to contact the core shaft 9;

[0040] The self-lubricating gasket 8 is annular and is arranged between the inner raceway of the outer ring 1 and the outer raceway of the inner ring 2; both ends of the inner raceway of the outer ring 1 and the two first grooves 11 are respectively provided with annular raised ribs 12 for limiting the self-lubricating gasket 8.

[0041] The cross-section of the first metal skeleton layer 61 of the lip oil seal 6 is L-shaped, the short side end of the L-shape is arranged in the first groove 11, and an annular fifth groove 16 is arranged on the end face of the first sealing layer 62 on the side of the long side of the L-shape away from the first groove 11; a sixth groove 17 is arranged on the radial inner side of the first sealing layer 62, and the lip oil seal 6 has an interference fit with the outer raceway of the inner ring 2.

[0042] The cross section of the second metal skeleton layer 71 of the sealing ring 7 is L-shaped, a fourth groove 15 is provided in the middle of the radial inner side of the second sealing layer 72, and the radial inner side of the second sealing layer 72 is serrated.

[0043] The material of the first sealing layer 62 of the lip seal 6 is hydrogenated nitrile rubber, which can meet the working temperature range of -40℃~+120℃, and the lip seal 6 is not easy to deform, and the lip of the lip seal 6 can maintain the fit between the lip and the outer raceway of the inner ring 2 for a long time, thereby enhancing the sealing performance. The material of the second sealing layer 72 is polytetrafluoroethylene, which has high strength.

[0044] The self-lubricating liner 8 is made of polyester fiber and polytetrafluoroethylene fiber woven by plain weave mixing process, and is bonded to the inner raceway of the outer ring 1 by dipping process. Grease is filled between each roller 3 and the cage 4, between each roller 3 and the inner raceway of the inner ring 2, and in the fourth groove 15. Both ribs 12 and the inner ring 2 are clearance fit.

[0045] In particular, in this embodiment, during assembly, the mandrel 9 passes through the inner ring 2, and the annular bearing seat 10 is assembled on the outer surface of the outer ring 1. The two O-rings 5 ​​assembled on the outer surface of the outer ring 1 can achieve flexible contact with the bearing seat 10 when the gap is matched, which is convenient for assembly and disassembly, easy for maintenance, and reduces assembly costs; the large friction caused by the deformation of the O-rings 5 ​​after assembly can prevent the outer ring 1 from running during operation, reduce the risk of creep wear of the bearing, and increase the service life of the bearing as a whole. In addition, the rolling coefficient of the roller 3 is much lower than the sliding friction coefficient of the self-lubricating liner 8, which can achieve the inner ring 2 and the outer ring 1 to be relatively still when the mandrel 9 rotates at high speed.

[0046] It should be noted that the above is only a specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any technician familiar with the technical field can easily think of various equivalent modifications or substitutions based on the specific implementation methods disclosed in the utility model, and these modifications or substitutions should be included in the protection scope of the utility model.

Claims

1. A self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free, comprising an annular outer ring (1) arranged in a bearing seat (10), an annular inner ring (2) arranged in the outer ring (1), a retaining frame (4) arranged in the inner ring (2), and a plurality of rollers (3) arranged on the retaining frame (4), wherein the plurality of rollers (3) are circumferentially distributed between an inner raceway of the inner ring (2) and a core shaft (9), and characterized in that: It also includes an O-ring (5), a lip oil seal (6), a sealing ring (7) and a self-lubricating gasket (8); Lubricating grease is filled between each of the rollers (3) and the retaining frame (4), and between each of the rollers (3) and the inner raceway of the inner ring (2); Each roller (3) has the same shape and size, and each roller (3) is cylindrical; both ends of the inner raceway of the outer ring (1) are provided with an annular first groove (11); both ends of the inner raceway of the inner ring (2) are provided with an annular third groove (14); two parallel annular second grooves (13) are symmetrically provided on the outer surface of the outer ring (1) relative to the radial midplane of the outer ring (1); there are two O-type sealing rings (5), and the two O-type sealing rings (5) are respectively provided in the two second grooves (13); The lip oil seal (6) comprises a first metal skeleton layer (61) and a first sealing layer (62) wrapped outside the first metal skeleton layer (61); the radial outer side of the lip oil seal (6) is embedded in the first groove (11), and the radial inner side of the lip oil seal (6) contacts the outer surface of the inner ring (2); The sealing ring (7) comprises a second metal skeleton layer (71) and a second sealing layer (72) wrapped around the second metal skeleton layer (71); the radial outer side of the sealing ring (7) is embedded in the third groove (14); and the radial inner side of the sealing ring (7) is used to contact the core shaft (9); The self-lubricating gasket (8) is annular and is arranged between the inner raceway of the outer ring (1) and the outer raceway of the inner ring (2); both ends of the inner raceway of the outer ring (1) and the two first grooves (11) are respectively provided with annular raised ribs (12) for limiting the position of the self-lubricating gasket (8).

2. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 1, characterized in that: The center axis of each roller (3) is parallel to the center axis of the self-aligning bearing.

3. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 2, characterized in that: The cross-section of the first metal skeleton layer (61) of the lip oil seal (6) is L-shaped, the short side end of the L-shape is arranged in the first groove (11), and an annular fifth groove (16) is arranged on the end surface of the first sealing layer (62) on the side of the long side of the L-shape away from the first groove (11); a sixth groove (17) is arranged on the radial inner side of the first sealing layer (62), and the lip oil seal (6) is interference fit with the outer raceway of the inner ring (2).

4. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 3, characterized in that: The cross section of the second metal skeleton layer (71) of the sealing ring (7) is L-shaped, a fourth groove (15) is provided in the middle of the radial inner side of the second sealing layer (72), and the radial inner side of the second sealing layer (72) is serrated.

5. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 3 or 4, characterized in that: The material of the first sealing layer (62) is hydrogenated nitrile rubber.

6. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 5, characterized in that: The material of the second sealing layer (72) is polytetrafluoroethylene.

7. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 2, characterized in that: The self-lubricating liner (8) is made of polyester fiber and polytetrafluoroethylene fiber woven by a plain weave mixed weaving process, and is bonded to the inner raceway of the outer ring (1) by a dipping process.

8. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 4, characterized in that: The fourth groove (15) is filled with lubricating grease.

9. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 1, characterized in that: The rib (12) and the inner ring (2) are clearance-fitted.

10. The self-aligning bearing capable of achieving high load-bearing capacity and maintenance-free according to claim 1, characterized in that: The number of the rollers (3) is fourteen.

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