Improved turntable bearing with three rows of cylindrical rollers

Abstract

The utility model discloses an improved turntable bearing with three rows of cylindrical rollers. The improved turntable bearing comprises an outer ring, a first inner ring, a second inner ring, a main thrust roller, a main thrust retainer, an auxiliary thrust roller and an auxiliary thrust retainer, the first inner ring and the second inner ring are located on the inner side of the outer ring, a main thrust retainer and an auxiliary thrust retainer are arranged among the first inner ring, the second inner ring and the outer ring, and the main thrust retainer and the auxiliary thrust retainer are correspondingly provided with a main thrust roller and an auxiliary thrust roller. Through the design of the retainer, the side wall of the inner ring, the side wall of the outer ring and the end part, lubricating grease can smoothly flow between the guide surfaces, the passing capacity of the lubricating grease between the retainers is improved, the friction force is reduced, good lubrication is obtained, the friction force is effectively reduced, the retainer rotates more smoothly during working, and the service life of the retainer is prolonged. And the overall gyroscopic moment of the bearing is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of bearing lubrication, and in particular to an improved three-row cylindrical roller slewing bearing. Background Art

[0002] The three-row cylindrical roller slewing bearing is a high-performance bearing type, which is designed with three rows of linearly arranged cylindrical rollers, which provide efficient force distribution when bearing loads, thus ensuring high load-bearing capacity and stability of the bearing. This bearing structure enables it to play a key role in various types of heavy machinery and precision equipment, especially in engineering machinery and metallurgical and mining equipment that require high load-bearing capacity and stable operation.

[0003] However, despite the many advantages of three-row cylindrical roller slewing bearings in design, they still have some limitations in practical applications. The main problem is that there is only line contact between the rollers and the raceways, and the outer and inner walls of the cage (used to fix and guide the rollers) and the cage guide surface of the ring are often in surface contact. This design results in a large friction torque during the start-up and rolling of the three-row cylindrical roller slewing bearing under the same specifications and stress conditions, especially the sliding friction between the cage and the ring guide surface becomes an important factor affecting its performance.

[0004] This increased friction torque not only reduces the operating efficiency of the bearing, but can also lead to increased energy consumption, shortened life, and increased maintenance costs. Therefore, there is an urgent need to develop a new three-row cylindrical roller slewing bearing design that can reduce the friction torque during starting and rolling, improve the overall performance and service life of the bearing, and reduce maintenance costs. Summary of the invention

[0005] The technical problem to be solved by the present application is to overcome the existing defects and provide an improved three-row cylindrical roller slewing bearing, which can effectively solve the problems in the background technology.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: an improved three-row cylindrical roller slewing bearing, comprising an outer ring, a first inner ring, a second inner ring, a main thrust roller, a main thrust cage, a secondary thrust roller, and a secondary thrust cage; the first inner ring and the second inner ring are located on the inner side of the outer ring, and a main thrust cage and a secondary thrust cage are arranged between the first inner ring, the second inner ring and the outer ring, the main thrust cage and the secondary thrust cage are correspondingly provided with a main thrust roller and a secondary thrust roller, the first inner ring and the outer ring where the main thrust cage is placed have an inner wall of a groove-shaped hole provided with a first oil guide groove, the second inner ring and the outer ring where the secondary thrust cage is placed have an inner wall of a groove-shaped hole provided with a second oil guide groove, the outer side walls of the main thrust cage and the secondary thrust cage are provided with a slightly convex arc, and the outer side walls and inner side walls of the main thrust cage and the secondary thrust cage are also provided with arc grooves.

[0007] As a preferred technical solution of the present application, a radial retainer is arranged between the first inner ring and the second inner ring, and radial rollers are arranged on the outer side of the radial retainer.

[0008] As a preferred technical solution of the present application, oil seals are provided on the outer ring, the first inner ring and the second inner ring.

[0009] As a preferred technical solution of the present application, the ends of the main thrust cage and the auxiliary thrust cage are provided with shaping sections.

[0010] Compared with the prior art: This application designs the retaining frame, inner and outer ring side walls and ends so that the grease can flow smoothly between the guide surfaces, thereby improving the grease passing capacity between the retaining frames, reducing friction, obtaining good lubrication, and effectively reducing friction, so that the retaining frame rotates more smoothly during operation, thereby reducing the overall rotational torque of the bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the structure of this application;

[0012] Figure 2 for Figure 1 The enlarged structural diagram at A in the middle;

[0013] Figure 3 for Figure 1 The enlarged structural diagram at B in the middle;

[0014] Figure 4 Schematic diagram of the main thrust cage and the auxiliary thrust cage structure;

[0015] Figure 5 Schematic diagram of the cross-sectional structure of the main thrust cage and the auxiliary thrust cage;

[0016] Figure 6 for Figure 4 Enlarged structural diagram at point C in the middle.

[0017] In the figure: 1 outer ring, 2 inner ring, 3 second inner ring, 4 main thrust roller, 5 main thrust cage, 6 secondary thrust roller, 7 secondary thrust cage, 8 radial roller, 9 radial cage, 10 first oil guide groove, 11 second oil guide groove, 12 slightly convex arc, 13 shaping segment. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application (for the convenience of description and understanding, the following is Figure 2 All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] See also Figure 1-6 The present application provides a technical solution: an improved three-row cylindrical roller slewing bearing, comprising an outer ring 1, a first inner ring 2, a second inner ring 3, a main thrust roller 4, a main thrust retainer 5, a secondary thrust roller 6, and a secondary thrust retainer 7; the first inner ring 2 and the second inner ring 3 are located on the inner side of the outer ring 1, and a main thrust retainer 5 and a secondary thrust retainer 7 are arranged between the first inner ring 2, the second inner ring 3 and the outer ring 1, and the main thrust retainer 5 and the secondary thrust retainer 7 are correspondingly arranged with the main thrust roller 4 and the secondary thrust roller 6.

[0020] The main thrust roller 4 is installed in the main thrust cage 5, and the secondary thrust roller 6 is positioned and guided by the secondary thrust cage 7, bearing and transmitting a large axial load to ensure that the equipment can operate stably and accurately in the axial direction, thereby improving the stability and load-bearing efficiency of the entire bearing system.

[0021] The first inner ring 2 and the inner wall of the slotted hole of the outer ring 1 for placing the main thrust retainer 5 are provided with a first oil guide groove 10, and the second inner ring 3 and the inner wall of the slotted hole of the outer ring 1 for placing the secondary thrust retainer 7 are provided with a second oil guide groove 11.

[0022] The first oil guide groove 10 and the second oil guide groove 11 can allow the grease / oil to flow smoothly on the guide surfaces of the main thrust retainer 5 and the auxiliary thrust retainer 7. When the guide surfaces of the main thrust retainer 5 and the auxiliary thrust retainer 7 contact and slide relative to the outer diameter side wall of the outer ring 1, good lubrication can be obtained, effectively reducing friction.

[0023] The outer side walls of the main thrust cage 5 and the secondary thrust cage 7 are provided with slightly convex arcs 12 .

[0024] The slightly convex arc design of the main thrust cage 5 and the auxiliary thrust cage 7 forms a contact state where the arc is tangent to the straight line when in contact with the guide surface, which reduces friction resistance and facilitates the entry and lubrication of grease, thereby improving the lubrication effect.

[0025] The outer side walls and inner side walls of the main thrust retainer 5 and the auxiliary thrust retainer 7 are also provided with arc grooves.

[0026] The arc groove allows the lubricating oil to smoothly enter between the outer ring 1 and the main thrust cage 5 and the auxiliary thrust cage 7, so that the main thrust cage 5 and the auxiliary thrust cage 7 can obtain good lubrication with the guide surface when sliding, and good lubrication reduces friction.

[0027] Furthermore, a radial retainer 9 is disposed between the first inner ring 2 and the second inner ring 3 , and radial rollers 8 are disposed on the outer side of the radial retainer 9 .

[0028] When subjected to radial loads from rotating parts of the equipment (i.e. forces perpendicular to the axis), radial rollers 8 will roll along the track between the inner and outer rings under the guidance of radial retainers 9, thereby transferring the radial load from the shaft to the bearing seat or other supporting structures. This effectively disperses the radial pressure, ensures that the bearing has good load-bearing capacity and stability in the radial direction, and reduces wear and fatigue caused by radial loads, so as to ensure that the bearing can maintain excellent working performance under long-term, high-load operating conditions.

[0029] Furthermore, the outer ring 1 , the first inner ring 2 , and the second inner ring 3 are all provided with oil seals.

[0030] The setting of the oil seal ensures that the grease inside the bearing will not overflow due to axial or radial movement. It also prevents dust, moisture and other contaminants from invading the inside of the bearing from outside the equipment, affecting the normal operation and service life of the bearing.

[0031] Furthermore, the ends of the main thrust cage 5 and the secondary thrust cage 7 are provided with a modified section 13 .

[0032] During operation, the grease will be squeezed into between the modified sections of the main thrust cage 5 and the auxiliary thrust cage 7 and the guide surfaces of the outer ring 1, the first inner ring 2, and the second inner ring 3, which is beneficial to the lubrication of the main thrust cage 5 and the auxiliary thrust cage 7.

[0033] During use, the grease / oil can enter the first oil guide groove 10, the second oil guide groove 11, the arc groove and the modified section between the main thrust cage 5 and the auxiliary thrust cage 7 and the outer ring 1, the first inner ring 2 and the second inner ring 3, effectively obtaining good lubrication. Good lubrication reduces friction. On the other hand, during operation, the grease is siphoned through the sliding of the main thrust cage 5 and the auxiliary thrust cage 7 and the intermittent squeezing and relaxation between the main thrust cage 5 and the auxiliary thrust cage 7 and the guide surfaces of the outer ring 1, the first inner ring 2 and the second inner ring 3, so that the grease enters between the main thrust cage 5 and the auxiliary thrust cage 7 and the guide surfaces of the outer ring 1, the first inner ring 2 and the second inner ring 3, forming a good lubricating oil film, thereby preventing the conventional main thrust cage 5 and the auxiliary thrust cage 7 from scraping and squeezing out the grease on the guide surface to form an edge lubrication and dry friction state, thereby reducing friction resistance.

[0034] Although the embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. An improved three-row cylindrical roller slewing bearing, comprising an outer ring (1), a first inner ring (2), a second inner ring (3), a main thrust roller (4), a main thrust retainer (5), a secondary thrust roller (6), and a secondary thrust retainer (7); the first inner ring (2) and the second inner ring (3) are located on the inner side of the outer ring (1), and a main thrust retainer (5) and a secondary thrust retainer (7) are arranged between the first inner ring (2), the second inner ring (3) and the outer ring (1); the main thrust roller (4) and the secondary thrust roller (6) are arranged on the main thrust retainer (5) and the secondary thrust retainer (7) respectively, and the characteristics are as follows: The first inner ring (2) and the inner wall of the slotted hole of the outer ring (1) for accommodating the main thrust retainer (5) are provided with a first oil guide groove (10), the second inner ring (3) and the inner wall of the slotted hole of the outer ring (1) for accommodating the secondary thrust retainer (7) are provided with a second oil guide groove (11), the outer side walls of the main thrust retainer (5) and the secondary thrust retainer (7) are provided with a slightly convex arc (12), and the outer side walls and inner side walls of the main thrust retainer (5) and the secondary thrust retainer (7) are also provided with arc grooves.

2. The improved three-row cylindrical roller slewing bearing according to claim 1, characterized in that: A radial retainer (9) is provided between the first inner ring (2) and the second inner ring (3), and radial rollers (8) are provided on the outer side of the radial retainer (9).

3. The improved three-row cylindrical roller slewing bearing according to claim 1, characterized in that: The outer ring (1), the first inner ring (2) and the second inner ring (3) are all provided with oil seals.

4. The improved three-row cylindrical roller slewing bearing according to claim 1, characterized in that: The ends of the main thrust retainer (5) and the secondary thrust retainer (7) are provided with shaping sections (13).

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