Three-row roller type slewing bearing

Abstract

The utility model discloses a slewing bearing with three rows of rollers, which relates to the technical field of slewing bearings and comprises a bearing main body consisting of an outer ring, an upper ring, a lower ring and rolling bodies, an upper sealing element, a lower sealing element, an upper support ring block and a lower support ring block. The upper step butt-joint groove and the lower step butt-joint groove are spliced, so that horizontal limiting alignment of the upper ring and the lower ring can be achieved, compared with traditional straight face splicing, the splicing precision of the upper ring and the lower ring is improved, meanwhile, through the step-shaped splicing path of the upper step butt-joint groove and the lower step butt-joint groove, the splicing precision of the upper ring and the lower ring is improved, and the splicing precision of the upper ring and the lower ring is improved. In addition, the upper sealing piece and the lower sealing piece are respectively supported by the upper supporting ring block and the lower supporting ring, so that the upper sealing piece and the lower sealing piece always keep a reset elastic force for attaching the upper supporting ring block and the lower supporting ring block, namely, the upper sealing piece and the lower sealing piece are tightly attached to the upper supporting ring block and the lower supporting ring 5; and therefore, a good sealing effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of slewing bearing technology, specifically a three-row roller slewing bearing. Background Technology

[0002] Slewing bearings are large bearings capable of withstanding comprehensive loads, including large axial and radial loads and overturning moments. Slewing bearings include the following types: single-row four-point contact ball slewing bearings, double-row unequal diameter ball slewing bearings, single-row crossed roller slewing bearings, and three-row roller slewing bearings.

[0003] The three-row roller slewing bearing includes an outer ring, an upper ring, and a lower ring. The upper ring is connected to the lower ring by bolts to form an inner ring structure. A boss is provided on the inner side of the outer ring. An upper raceway is provided between the top of the boss and the upper ring. An upper row of rollers is placed in the upper raceway. A lower raceway is provided between the bottom of the boss and the lower ring. A lower row of rollers is placed in the lower raceway. A radial raceway is provided between the side of the boss and the inner ring structure. A radial roller is placed in the radial raceway.

[0004] The three-row roller slewing bearing has a robust structure and is particularly suitable for heavy machinery requiring large diameters, such as bucket wheel excavators, wheeled cranes, marine cranes, port cranes, molten steel slewing tables, and large-tonnage truck cranes.

[0005] The most common problem with three-row roller slewing bearings is that external water can easily enter the raceway through the joint gaps, causing the rollers to rust. Therefore, in order to further improve the sealing performance of three-row roller slewing bearings, a three-row roller slewing bearing is provided. Utility Model Content

[0006] The purpose of this utility model is to provide a three-row roller slewing bearing in order to solve the problems mentioned above.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a three-row roller slewing bearing, comprising a support body composed of an outer ring, an upper ring, a lower ring, and rolling elements. The upper and lower rings are symmetrically distributed vertically and located inside the outer ring. The rolling elements are distributed between the outer ring and the upper and lower rings. An upper annular groove is formed on the outer side of the upper ring near the top, and a lower annular groove is formed on the inner side of the outer ring near the bottom. An upper seal and a lower seal are respectively installed on the inner side of the upper and lower annular grooves. The upper seal is used to shield and protect the gap between the outer ring and the upper ring, and the lower seal is used to shield and protect the gap between the outer ring and the lower ring.

[0008] An upper support ring block is fixed at the top of the outer ring near the inner side. The outer side of the upper support ring block is inclined and fits tightly against the lower surface of the upper seal.

[0009] A lower support ring block is fixed at the bottom of the lower ring near the outer side. The inner side of the lower support ring block is inclined and fits against the upper surface of the lower seal.

[0010] As a further improvement of this utility model: the bottom of the upper ring is formed with an upper stepped docking groove, and the top of the lower ring is formed with a lower stepped docking groove. By bringing the upper stepped docking groove and the lower stepped docking groove closer to each other, the upper ring and the lower ring are horizontally limited.

[0011] As a further embodiment of this utility model: the top of the upper ring is provided with a flange hole that extends to the bottom of the lower ring, and the top of the upper ring is also provided with a fixing threaded hole that extends to the interior of the lower ring;

[0012] The fixed threaded holes are distributed at the outermost steps of the upper and lower stepped mating grooves, and the flange holes are distributed at the middle steps of the upper and lower stepped mating grooves.

[0013] As a further embodiment of this utility model: the upper sealing element is interference-fitted with the upper annular groove, and the lower sealing element is interference-fitted with the lower annular groove; the upper sealing element is in close contact with the upper support ring block, and the lower sealing element is in close contact with the lower support ring block.

[0014] As a further embodiment of this utility model: the outer ring, lower annular groove, and upper support ring block are integrally formed by casting, cutting, and drilling processes; the upper ring, upper stepped mating groove, upper annular groove, flange hole, and fixing threaded hole are integrally formed by casting, cutting, and drilling processes; and the lower ring, lower stepped mating groove, flange hole, fixing threaded hole, and lower support ring block are integrally formed by casting, cutting, and drilling processes.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] By setting the upper and lower stepped mating grooves for splicing, the horizontal limit alignment of the upper and lower rings can be achieved. Compared with the traditional straight splicing, this not only improves the splicing accuracy of the upper and lower rings, but also further improves the splicing sealing effect through the stepped splicing path of the upper and lower stepped mating grooves. This effectively prevents external water from entering the raceway through the splicing point of the upper and lower stepped mating grooves. In addition, the upper support ring block and the lower support ring support the upper and lower seals respectively, so that the upper and lower seals always maintain a restoring elastic force that keeps them in contact with the upper and lower support ring blocks. That is, the upper and lower seals are kept in close contact with the upper support ring block and the lower support ring 5, thereby achieving a good sealing effect. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the structure of this utility model;

[0019] Figure 3 This is a cross-sectional view of the present invention.

[0020] Figure 4 This is a schematic diagram showing the disassembly of the lower seal and the outer ring of this utility model.

[0021] In the diagram: 1. Support body; 101. Outer ring; 102. Upper ring; 103. Lower ring; 104. Rolling element; 105. Upper stepped mating groove; 106. Upper annular groove; 107. Lower stepped mating groove; 108. Flange hole; 109. Fixed threaded hole; 110. Lower annular groove; 2. Upper seal; 3. Upper support ring block; 4. Lower seal; 5. Lower support ring block. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figures 1-4 In this embodiment of the present invention, a three-row roller slewing bearing includes a support body 1 composed of an outer ring 101, an upper ring 102, a lower ring 103, and rolling elements 104. The upper ring 102 and the lower ring 103 are symmetrically distributed vertically and located inside the outer ring 101. The rolling elements 104 are distributed between the outer ring 101 and the upper ring 102 and the lower ring 103. An upper annular groove 106 is provided on the outer side of the upper ring 102 near the top, and a lower annular groove 110 is provided on the inner side of the outer ring 101 near the bottom. An upper sealing element 2 and a lower sealing element 4 are respectively installed on the inner side of the upper annular groove 106 and the lower annular groove 110. The upper sealing element 2 is used to shield and protect the gap between the outer ring 101 and the upper ring 102, and the lower sealing element 4 is used to shield and protect the gap between the outer ring 101 and the lower ring 103.

[0024] An upper support ring 3 is fixed at the top of the outer ring 101 near the inner side. The outer side of the upper support ring 3 is inclined and fits tightly against the lower surface of the upper seal 2.

[0025] A lower support ring 5 is fixed at the bottom of the lower ring 103 near the outer side. The inner side of the lower support ring 5 is inclined and fits against the upper surface of the lower seal 4.

[0026] The bottom of the upper ring 102 is formed with an upper stepped docking groove 105, and the top of the lower ring 103 is formed with a lower stepped docking groove 107. The upper stepped docking groove 105 and the lower stepped docking groove 107 approach each other to achieve horizontal positioning of the upper ring 102 and the lower ring 103.

[0027] The top of the upper ring 102 is provided with a flange hole 108 that extends to the bottom of the lower ring 103, and the top of the upper ring 102 is also provided with a fixing thread hole 109 that extends to the interior of the lower ring 103.

[0028] Fixed threaded holes 109 are distributed at the outermost steps of the upper stepped mating groove 105 and the lower stepped mating groove 107, and flange holes 108 are distributed at the middle steps of the upper stepped mating groove 105 and the lower stepped mating groove 107.

[0029] The upper seal 2 is in an interference fit with the upper annular groove 106, and the lower seal 4 is in an interference fit with the lower annular groove 110. The upper seal 2 is in a tight fit with the upper support ring block 3, and the lower seal 4 is in a tight fit with the lower support ring block 5.

[0030] In this embodiment: During the assembly process of this slewing bearing, when the upper ring 102 and the lower ring 103 are joined, they approach each other through the upper stepped docking groove 105 and the lower stepped docking groove 107. This achieves horizontal positioning alignment of the upper ring 102 and the lower ring 103. Compared with the traditional straight-face splicing, this not only improves the splicing accuracy of the upper ring 102 and the lower ring 103, but also further improves the splicing sealing effect through the stepped splicing path of the upper stepped docking groove 105 and the lower stepped docking groove 107. This effectively prevents external water from entering the raceway through the splicing point of the upper stepped docking groove 105 and the lower stepped docking groove 107.

[0031] In addition, after the slewing bearing is assembled, the upper seal 2 fits into the upper support ring 3, and the lower seal 4 fits into the lower support ring 5. This makes the contact surfaces of the upper seal 2 and the outer ring 101, and the lower seal 4 and the lower ring 103, form a stepped shape, which can block the flow path of water. At the same time, the upper support ring 3 and the lower support ring 5 support the upper seal 2 and the lower seal 4 respectively, so that the upper seal 2 and the lower seal 4 always maintain a restoring elastic force that keeps them in contact with the upper support ring 3 and the lower support ring 5. That is, the upper seal 2 and the lower seal 4 keep in close contact with the upper support ring 3 and the lower support ring 5, thereby achieving a good sealing effect.

[0032] Please refer to this carefully. Figures 1-4The outer ring 101, the lower annular groove 110, and the upper support ring block 3 are integrally formed by casting, cutting, and drilling processes. The upper ring 102, the upper stepped mating groove 105, the upper annular groove 106, the flange hole 108, and the fixing threaded hole 109 are integrally formed by casting, cutting, and drilling processes. The lower ring 103, the lower stepped mating groove 107, the flange hole 108, the fixing threaded hole 109, and the lower support ring block 5 are integrally formed by casting, cutting, and drilling processes.

[0033] In this embodiment, the overall machining process of this slewing bearing is the same as that of traditional machining processes, which facilitates production improvement based on existing equipment and promotes its application.

[0034] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A three-row roller slewing bearing, comprising a support body (1) consisting of an outer ring (101), an upper ring (102), a lower ring (103), and rolling elements (104), wherein the upper ring (102) and the lower ring (103) are symmetrically distributed vertically and located inside the outer ring (101), and the rolling elements (104) are distributed between the outer ring (101) and the upper ring (102) and the lower ring (103), characterized in that, An upper annular groove (106) is provided on the outer side of the upper ring (102) near the top, and a lower annular groove (110) is provided on the inner side of the outer ring (101) near the bottom. An upper sealing element (2) and a lower sealing element (4) are respectively installed on the inner side of the upper annular groove (106) and the lower annular groove (110). The upper sealing element (2) is used to shield and protect the gap between the outer ring (101) and the upper ring (102), and the lower sealing element (4) is used to shield and protect the gap between the outer ring (101) and the lower ring (103). The upper support ring block (3) is fixed at the top of the outer ring (101) near the inner side. The outer side of the upper support ring block (3) is inclined and closely fits the lower surface of the upper seal (2). The lower ring (103) has a lower support ring block (5) fixed at the bottom near the outer side. The inner side of the lower support ring block (5) is inclined and fits against the upper surface of the lower seal (4).

2. The three-row roller slewing bearing according to claim 1, characterized in that, The bottom of the upper ring (102) is formed with an upper stepped docking groove (105), and the top of the lower ring (103) is formed with a lower stepped docking groove (107). The upper stepped docking groove (105) and the lower stepped docking groove (107) are brought close to each other to achieve horizontal positioning of the upper ring (102) and the lower ring (103).

3. A three-row roller slewing bearing according to claim 2, characterized in that, The top of the upper ring (102) is provided with a flange hole (108) that extends to the bottom of the lower ring (103), and the top of the upper ring (102) is also provided with a fixing thread hole (109) that extends to the interior of the lower ring (103). The fixed threaded holes (109) are distributed at the outermost steps of the upper stepped mating groove (105) and the lower stepped mating groove (107), and the flange holes (108) are distributed at the middle steps of the upper stepped mating groove (105) and the lower stepped mating groove (107).

4. A three-row roller slewing bearing according to claim 1, characterized in that, The upper seal (2) is in an interference fit with the upper annular groove (106), and the lower seal (4) is in an interference fit with the lower annular groove (110). The upper seal (2) is in a tight fit with the upper support ring block (3), and the lower seal (4) is in a tight fit with the lower support ring block (5).

5. A three-row roller slewing bearing according to claim 3, characterized in that, The outer ring (101), lower annular groove (110), and upper support ring block (3) are integrally formed by casting, cutting, and drilling processes. The upper ring (102), upper stepped docking groove (105), upper annular groove (106), flange hole (108), and fixed threaded hole (109) are integrally formed by casting, cutting, and drilling processes. The lower ring (103), lower stepped docking groove (107), flange hole (108), fixed threaded hole (109), and lower support ring block (5) are integrally formed by casting, cutting, and drilling processes.

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