A slewing bearing

Abstract

The present invention provides a slewing bearing, comprising an outer ring assembly, a first inner ring and a second inner ring; a cavity is arranged in the side wall of the outer ring assembly, a first inner ring and a second inner ring are arranged in the cavity, the first inner ring is sleeved on the second inner ring and the two are rotatably arranged, the cavity has an opening, and the opening direction of the cavity is the same as the direction of the central axis of the slewing bearing; a roller assembly is arranged between the first inner ring and the cavity and between the second inner ring and the cavity. The slewing bearing provided by the present invention can meet the needs of engineering machinery with a dual drive system, and because the same bearing is used to meet the dual drive system, compared with the dual drive system in the prior art solution that requires two sets of bearings, the space required for bearing installation can be greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bearings, in particular to a slewing bearing, and more particularly to a slewing bearing for a dual drive system. Background Art

[0002] In the field of engineering machinery, slewing bearings are key components of transmission parts in the mechanical field and play a role in transmitting power.

[0003] In engineering applications, slewing bearings need to withstand time-varying loads, mainly including axial loads, radial loads and overturning moments. Due to the complex and changeable working conditions of engineering machinery during construction, special working conditions may occur occasionally. At this time, extremely severe eccentric loads, alternating loads and time-varying loads may occur in a short period of time. At this time, the slewing bearing needs to withstand the impact loads, eccentric loads and high loads caused by sudden severe working conditions. If the bearing capacity of the slewing bearing is small, the fatigue life of the slewing bearing will be shortened and the loss of the slewing bearing will be accelerated. However, if the slewing bearing is designed too strong, it is often not necessary to deal with high-strength impact loads and eccentric loads when used under normal circumstances. At this time, the over-design of the bearing capacity of the slewing bearing will lead to excessive performance.

[0004] In addition, the slewing bearing needs to be designed based on high load-bearing capacity. The conventional method to improve the load-bearing capacity is to increase the structural size of the slewing bearing and increase the roller diameter. For large-diameter slewing bearings that mainly bear axial force, the diameter of the main push roller often exceeds 100 mm, which often brings a series of difficulties such as roller processing and heat treatment. At the same time, under high offset load conditions, the cage often becomes skewed, thereby interfering with the operation of the rolling elements and causing the impact wear between the rolling element cage and the ring to increase, which not only generates great noise but also affects the service life of the main bearing. Therefore, how to comprehensively consider the universal applicability and high impact load resistance of the slewing bearing has become a difficult problem.

[0005] At the same time, there are technical obstacles in realizing the dual-drive system in a smaller space for engineering machinery such as dual-cutter drive system, engineering machinery with two drive modes, etc.

[0006] In summary, there is an urgent need for a slewing bearing that can switch between high-load and low-load modes, has a cage that is not prone to movement, and can meet the requirements of a dual-drive system to solve the problems existing in the prior art. Summary of the invention

[0007] The present invention aims to provide a slewing bearing, aiming to solve the problems that the prior art cannot switch between high-load and low-load modes, the cage is easy to move and cannot meet the dual-drive system. The specific technical solution is as follows:

[0008] A slewing bearing comprises an outer ring assembly, a first inner ring and a second inner ring; a cavity is arranged in the side wall of the outer ring assembly, the first inner ring and the second inner ring are arranged in the cavity, the first inner ring is sleeved on the second inner ring and the two are rotatably arranged therebetween, the cavity has an opening, and the opening direction of the cavity is the same as the direction of the central axis of the slewing bearing; a roller assembly is arranged between the first inner ring and the cavity and between the second inner ring and the cavity.

[0009] Preferably, the roller assembly includes an axial roller unit and a radial roller unit; the axial roller unit is arranged between the axial contact surface of the first inner ring and the cavity and between the axial contact surface of the second inner ring and the cavity; the radial roller unit is arranged between the radial contact surface of the first inner ring and the cavity and between the radial contact surface of the second inner ring and the cavity.

[0010] Preferably, the single axial roller includes a main push roller and an auxiliary push roller, the main push roller is arranged on the side of the first inner ring away from the opening and the side of the second inner ring away from the opening, and the auxiliary push roller is arranged on the side of the first inner ring close to the opening and the side of the second inner ring close to the opening.

[0011] Preferably, a groove is provided on the side of the first inner ring away from the opening and the side of the second inner ring away from the opening, a main push raceway ring is provided in the groove, a disc spring group is provided between the bottom of the groove and the main push raceway ring, and the main push roller is provided in the groove and in contact with the main push raceway ring.

[0012] Preferably, the disc spring group includes a plurality of disc spring single pieces, which are arranged in sequence along the groove direction between the bottom of the groove and the main push raceway ring. The disc spring single piece includes a guide column and a plurality of disc springs arranged on the guide column. One end of the guide column is fixedly connected to the bottom of the groove, and the other end is fixedly connected to the main push raceway ring.

[0013] Preferably, the outer ring assembly comprises a first outer ring and a second outer ring, the first outer ring is sleeved on the second outer ring, a cavity is provided on the side wall of the second outer ring, and the first inner ring and the second inner ring are provided in the cavity.

[0014] Preferably, the radial roller unit is a spherical roller.

[0015] Preferably, it further comprises a radial roller cage and an auxiliary thrust roller cage, wherein the radial roller cage is provided with a radial roller single piece, and the auxiliary thrust roller cage is provided with an auxiliary thrust roller.

[0016] Preferably, the radial roller cage and the auxiliary thrust roller cage are integrally formed.

[0017] Preferably, an oil storage tank is provided between the first inner ring and the second inner ring, and lubricating oil is provided in the groove and the oil storage tank.

[0018] The application of the technical solution of the present invention has the following beneficial effects:

[0019] (1) The present invention provides a slewing bearing, which adopts a combination of an outer ring assembly and a double inner ring, wherein a first inner ring and a second inner ring are rotatably arranged, and the first inner ring and the second inner ring are respectively connected to different drive systems in a dual drive system, thereby being able to meet the needs of engineering machinery with a dual drive system. Moreover, since the same bearing is used to meet the dual drive system, compared with the prior art solution in which the dual drive system requires two sets of bearings, the space required for bearing installation can be greatly reduced.

[0020] (2) In the present invention, a groove is provided on the side of the first inner ring away from the opening and on the side of the second inner ring away from the opening, a main push raceway ring is provided in the groove, a disc spring group is provided between the bottom of the groove and the main push raceway ring, the main push roller is provided in the groove and contacts with the main push raceway ring, in the low load mode, one side of the main push roller contacts with the main push raceway ring, and the other side protrudes from the surface of the first inner ring and the second inner ring and contacts with the second outer ring, thereby maintaining the rotation of the first inner ring and the second inner ring; in the high load mode, the main push roller is subjected to a certain force, which acts on the disc spring group to shrink it, and the main push roller retracts into the groove, at which time the second outer ring mainly contacts with one side of the first inner ring and the second inner ring, and the first inner ring and the second inner ring slide relative to the second outer ring respectively, so that the slewing bearing provided by the present invention can realize the switching between high load and low load modes by changing the load-bearing capacity.

[0021] (3) In the present invention, the radial roller cage and the auxiliary thrust roller cage are integrally formed. Since the radial roller cage is in the radial direction and the auxiliary thrust roller cage is in the axial direction, the two are integrally formed. Under high eccentric load conditions, the radial roller cage and the auxiliary thrust roller cage do not move, thereby avoiding interference with the operation of the first inner ring and the second inner ring, thereby increasing the service life of the slewing bearing.

[0022] (4) In the present invention, lubricating oil is provided in the groove and in the oil storage tank between the first inner ring and the second inner ring, so that the first inner ring, the second inner ring and the second outer ring in the slewing bearing can be lubricated continuously and effectively, especially reducing the friction between the first inner ring and the second inner ring, thereby ensuring that the slewing bearing can run smoothly.

[0023] (5) In the present invention, the radial roller is a spherical roller. When the first inner ring or the second inner ring moves relative to the second outer ring, it can roll along the direction of movement, thereby reducing the friction between the first inner ring and the second outer ring and between the second inner ring and the second outer ring, thereby increasing the service life of the slewing bearing.

[0024] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a schematic diagram of the overall structure of the preferred embodiment 1 of the present invention;

[0027] Figure 2 yes Figure 1 A partial enlarged schematic diagram of

[0028] Figure 3 yes Figure 1 Schematic diagram of the structure of the middle disc spring group;

[0029] Figure 4 yes Figure 1 A schematic diagram of the structure of the oil storage tank between the first inner ring and the second inner ring;

[0030] Figure 5 yes Figure 1 Partial schematic diagram of the central radial roller cage and the auxiliary thrust roller cage;

[0031] Among them, 1-first inner ring, 2-second inner ring, 3-first outer ring, 4-main push roller, 5-main push raceway ring, 6-single disc spring, 6.1-guide column, 6.2-disc spring, 7-spherical roller, 8-radial roller cage, 9-auxiliary push roller, 10-second outer ring, 11-auxiliary push roller cage, 12-oil storage tank. DETAILED DESCRIPTION

[0032] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively below, and preferred embodiments of the present invention are provided. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0034] Embodiment 1:

[0035] See also Figure 1-2A slewing bearing comprises an outer ring assembly, a first inner ring 1 and a second inner ring 2; a cavity is arranged in the side wall of the outer ring assembly, the first inner ring 1 and the second inner ring 2 are arranged in the cavity, the first inner ring 1 is sleeved on the second inner ring 2 and the two are rotatably arranged, the cavity has an opening, the opening direction of the cavity is the same as the direction of the central axis of the slewing bearing (through the opening, a dual drive system can be connected to the first inner ring 1 and the second inner ring 2 respectively); a roller assembly is arranged between the first inner ring 1 and the cavity and between the second inner ring 2 and the cavity.

[0036] In this embodiment, the roller assembly includes an axial roller unit and a radial roller unit; the axial roller unit is arranged between the axial contact surface between the first inner ring 1 and the cavity and between the axial contact surface between the second inner ring 2 and the cavity; the radial roller unit is arranged between the radial contact surface between the first inner ring 1 and the cavity and between the radial contact surface between the second inner ring 2 and the cavity.

[0037] In this embodiment, the axial roller single piece includes a main push roller 4 and an auxiliary push roller 9. The main push roller 4 is arranged on the side of the first inner ring 1 away from the opening and on the side of the second inner ring 2 away from the opening, and the auxiliary push roller 9 is arranged on the side of the first inner ring 1 close to the opening and on the side of the second inner ring 2 close to the opening.

[0038] In this embodiment, a groove is provided on the side of the first inner ring 1 away from the opening and the side of the second inner ring 2 away from the opening, a main push raceway ring 5 is provided in the groove, a disc spring group is provided between the bottom of the groove and the main push raceway ring 5, and the main push roller 4 is provided in the groove and contacts with the main push raceway ring 5; in the low load mode, one side of the main push roller 4 contacts with the main push raceway ring 5, and the other side protrudes from the surface of the first inner ring 1 and the second inner ring 2 and contacts with the second outer ring 10, thereby maintaining the rotation of the first inner ring 1 and the second inner ring 2; in the high load mode, the main push roller 4 is subjected to a certain force, and the main push raceway ring 5 acts on the disc spring group to shrink it, and the main push roller 4 retracts into the groove, at which time the second outer ring 10 mainly contacts with one side of the first inner ring 1 and the second inner ring 2, and the first inner ring 1 and the second inner ring 2 slide relative to the second outer ring 10 respectively, so that the slewing bearing provided by the present invention can realize the switching between high load and low load modes by changing the load-bearing capacity.

[0039] In this embodiment, the disc spring group includes a plurality of disc spring single pieces 6 (which can be selected according to work requirements, and the specific structure is shown in Figure 3), a plurality of disc spring single pieces 6 are sequentially arranged along the groove direction between the bottom of the groove and the main push raceway ring 5, the disc spring single piece 6 comprises a guide column 6.1 (the guide column is elastic and can deform with the deformation of the disc spring) and a plurality of disc springs 6.2 sleeved on the guide column 6.1, one end of the guide column 6.1 is fixedly connected to the bottom of the groove, and the other end is fixedly connected to the main push raceway ring 5, and a gasket is also arranged between the disc spring and the main push raceway ring.

[0040] In this embodiment, the outer ring assembly includes a first outer ring 3 and a second outer ring 10, the first outer ring 3 is sleeved on the second outer ring 10, a cavity is provided on the side wall of the second outer ring 10, and the first inner ring 1 and the second inner ring 2 are provided in the cavity.

[0041] In this embodiment, the radial roller is a spherical roller 7. When the first inner ring 1 or the second inner ring 2 moves relative to the second outer ring 10, the spherical roller 7 can roll along the direction of movement, thereby reducing the friction between the first inner ring 1 and the second outer ring 10 and the second inner ring 2 and the second outer ring 10, thereby increasing the service life of the slewing bearing.

[0042] In this embodiment, a radial roller cage 8 and an auxiliary thrust roller cage 11 are also included. The radial roller cage 8 is provided with a single radial roller, and the auxiliary thrust roller cage 11 is provided with an auxiliary thrust roller 9.

[0043] In this embodiment, the radial roller cage 8 and the auxiliary thrust roller cage 11 are integrally formed. Figure 5 Under high eccentric load conditions, the radial roller cage 8 and the auxiliary thrust roller cage 11 do not move, thereby avoiding interference with the operation of the first inner ring 1 and the second inner ring 2, and improving the service life of the slewing bearing.

[0044] In this embodiment, an oil storage tank 12 is provided between the first inner ring 1 and the second inner ring 2. Figure 4 Lubricating oil is provided in the groove and the oil storage tank 12.

[0045] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A slewing bearing, characterized in that: The invention comprises an outer ring assembly, a first inner ring (1) and a second inner ring (2); the outer ring assembly comprises a first outer ring (3) and a second outer ring (10); the first outer ring (3) is axially arranged on the second outer ring (10); a cavity is arranged in the side wall of the outer ring assembly; the first inner ring (1) and the second inner ring (2) are arranged in the cavity; the first inner ring (1) is sleeved on the radial outer side of the second inner ring (2) and the two are rotatably arranged therebetween; the cavity has an opening, and the opening is arranged at an axial end of the second outer ring (10) away from the first outer ring (3). , the opening direction of the cavity is the same as the direction of the central axis of the slewing bearing; a roller assembly is arranged between the first inner ring (1) and the cavity and between the second inner ring (2) and the cavity, and the roller assembly includes an axial roller single piece and a radial roller single piece; the axial roller single piece is arranged between the axial contact surface of the first inner ring (1) and the cavity and between the axial contact surface of the second inner ring (2) and the cavity; the radial roller single piece is arranged between the radial contact surface of the first inner ring (1) and the cavity and between the radial contact surface of the second inner ring (2) and the cavity; The first inner ring (1) and the second inner ring (2) are respectively connected to different drive systems in the dual drive system.

2. The slewing bearing according to claim 1, characterized in that: The axial roller single piece comprises a main push roller (4) and an auxiliary push roller (9), wherein the main push roller (4) is arranged on a side of the first inner ring (1) away from the opening and on a side of the second inner ring (2) away from the opening, and the auxiliary push roller (9) is arranged on a side of the first inner ring (1) close to the opening and on a side of the second inner ring (2) close to the opening.

3. The slewing bearing according to claim 2, characterized in that: A groove is provided on the side of the first inner ring (1) away from the opening and on the side of the second inner ring (2) away from the opening. A main push raceway ring (5) is provided in the groove. A disc spring group is provided between the bottom of the groove and the main push raceway ring (5). The main push roller (4) is provided in the groove and in contact with the main push raceway ring (5).

4. The slewing bearing according to claim 3, characterized in that: The disc spring group comprises a plurality of disc spring single pieces (6), the plurality of disc spring single pieces (6) being arranged in sequence between the bottom of the groove and the main push raceway ring (5) along the direction of the groove, the disc spring single piece (6) comprising a guide column (6.1) and a plurality of disc springs (6.2) arranged on the guide column (6.1), one end of the guide column (6.1) being fixedly connected to the bottom of the groove, and the other end being fixedly connected to the main push raceway ring (5).

5. The slewing bearing according to claim 4, characterized in that: The radial roller single piece is a spherical roller (7).

6. The slewing bearing according to claim 5, characterized in that: It also comprises a radial roller cage (8) and an auxiliary thrust roller cage (11), wherein a radial roller single piece is arranged in the radial roller cage (8), and an auxiliary thrust roller (9) is arranged in the auxiliary thrust roller cage (11).

7. The slewing bearing according to claim 6, characterized in that: The radial roller cage (8) and the auxiliary thrust roller cage (11) are integrally formed.

8. The slewing bearing according to any one of claims 3 to 7, characterized in that: An oil storage groove (12) is provided between the first inner ring (1) and the second inner ring (2), and lubricating oil is provided in the groove and in the oil storage groove (12).

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