Low-friction high-bearing-capacity ball column composite turntable bearing

Abstract

A low-friction high-bearing-capacity ball column composite turntable bearing comprises an inner ring and an outer ring, a row of rolling bodies are arranged between the two side faces of the outer ring and the inner ring, a plurality of radial rolling bodies are annularly distributed between the inner circumferential face of the outer ring and the inner ring, and each row of rolling bodies comprises three rows of rolling bodies. The three rows of rolling bodies are sequentially an inner side rolling body, a middle rolling body and an outer side rolling body which are annularly distributed, each row of rolling bodies is limited through the corresponding split type retainer, each split type retainer comprises an upper frame piece and a lower frame piece which are arranged in a stacked mode, the upper frame piece and the lower frame piece are provided with an upper pocket groove and a lower pocket groove respectively, and the upper pocket groove and the lower pocket groove form a pocket hole; the inner side rolling bodies and the outer side rolling bodies are spherical rollers, and the middle rolling bodies and the radial rolling bodies are cylindrical rollers. And retainer connecting balls are arranged between the adjacent split retainers. Sliding friction caused by different speeds of the inner side and the outer side of the roller is weakened, so that the friction torque of the bearing is reduced; and the rigidity and the bearing capacity of the bearing are improved.

Description

Technical Field

[0001] The invention relates to the technical field of bearings, and in particular to a low-friction and high-load-bearing ball-column composite turntable bearing. Background Art

[0002] The traditional turntable bearing is a three-row roller combination bearing, which is composed of two thrust cylindrical roller bearings and a full-complement radial cylindrical roller bearing. The upper and lower rows of axial rollers of this bearing will produce a speed difference at both ends during the rotation process, which will cause the rollers to spin and form sliding friction, making the friction torque of the bearing too large, causing the temperature of the bearing to continue to rise during operation, causing the axial rollers and raceways to be burned and damaged, thereby affecting the normal use of the bearing. With the development of some high-precision rotating equipment such as radar, turntable bearings need to have the ability to have higher axial load and lower friction, and traditional turntable bearings can no longer meet the demand. Therefore, the market needs a low-friction and high-load ball-column composite turntable bearing. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a low-friction and high-load ball-column composite turntable bearing, which can meet both high axial load and low friction torque requirements.

[0004] The purpose of the present invention is to be achieved by adopting the following technical scheme. According to the present invention, a low-friction and high-load ball-cylinder composite turntable bearing includes an inner ring, an outer ring rotatably arranged on the outer periphery of the inner ring, a row of rolling bodies are arranged between the two side surfaces of the outer ring and the inner ring, a plurality of radial rolling bodies are circumferentially distributed between the inner circumferential surface of the outer ring and the inner ring, each row of rolling bodies includes three rows of rolling bodies arranged concentrically, and the three rows of rolling bodies are circumferentially distributed inner rolling bodies, middle rolling bodies, and outer rolling bodies, respectively, from the inside to the outside, and each row of rolling bodies is limited by a corresponding split cage, and the split cage includes an upper frame sheet and a lower frame sheet arranged in a superimposed manner, and the upper frame sheet and the lower frame sheet are respectively provided with an upper pocket groove and a lower pocket groove for limiting the position of the corresponding rolling body, and the upper pocket groove and the lower pocket groove form a pocket hole matching the corresponding rolling body; the inner rolling body and the outer rolling body are both spherical rollers, and the middle rolling body and the radial rolling body are both cylindrical rollers; and a cage connecting ball is arranged between the adjacent split cages.

[0005] Furthermore, the inner ring includes a first inner ring and a second inner ring, the cross-sectional shape of the inner ring is an I-shaped, so that an annular groove is formed on the outer circumferential surface of the inner ring, and the outer ring is nested in the annular groove; the first inner ring and the second inner ring are detachably connected.

[0006] Furthermore, the outer ring is detachably arranged on the base.

[0007] Furthermore, grooves for rolling of the rolling bodies are provided at relative positions of the inner ring and the outer ring.

[0008] Furthermore, the split retainer is made of brass material.

[0009] Furthermore, the inner rolling body is installed on an inner ball split retaining frame, and the inner ball split retaining frame includes an inner upper frame plate and an inner lower frame plate fixed by rivets. The corresponding positions of the inner upper frame plate and the inner lower frame plate for installing the inner rolling body are respectively provided with roller upper pocket grooves and roller lower pocket grooves. The roller upper pocket groove is narrow at the top and wide at the bottom, and the roller lower pocket groove is wide at the top and narrow at the bottom. The ball pocket hole composed of the roller upper pocket groove and the roller lower pocket groove is wide in the middle and narrow at the upper and lower ends, and matches the shape of the inner rolling body so that the upper and lower ends of the inner rolling body are exposed.

[0010] Furthermore, a plurality of cage edge pockets are circumferentially distributed on the outer circumferential surface of the inner ball split cage, and the cage edge pockets include an edge upper pocket groove located on the inner upper frame plate and an edge lower pocket groove located on the inner lower frame plate, and the edge upper pocket groove and the edge lower pocket groove are butted together to form a cage edge pocket groove that matches the shape of the cage connecting ball, and the cage connecting ball is nested in the cage edge pocket groove and a portion protrudes from the cage edge pocket groove, and the protruding portion is in rolling contact with the inner circumferential surface of the short cylindrical roller split cage for limiting the intermediate rolling body, and the inner circumferential surface of the short cylindrical roller split cage is provided with a groove that matches the cage connecting ball.

[0011] Furthermore, the intermediate rolling body is installed in a short cylindrical roller split retaining frame, which includes an intermediate upper frame plate and an intermediate lower frame plate fixed by rivets. The corresponding positions of the intermediate upper frame plate and the intermediate lower frame plate for installing the intermediate rolling body are respectively provided with roller upper pocket grooves and roller lower pocket grooves. The roller upper pocket groove is narrow at the top and wide at the bottom, and the roller lower pocket groove is wide at the top and narrow at the bottom. The short cylindrical roller pocket hole composed of the roller upper pocket groove and the roller lower pocket groove is wide in the middle and narrow at the upper and lower ends, and matches the shape of the intermediate rolling body so that the upper and lower ends of the intermediate rolling body are exposed.

[0012] Furthermore, the outer rolling body is installed on an outer ball split retaining frame, and the outer ball split retaining frame includes an outer upper frame plate and an outer lower frame plate fixed by rivets. The corresponding positions of the outer upper frame plate and the outer lower frame plate for installing the outer rolling body are respectively provided with upper roller pocket grooves and lower roller pocket grooves. The upper roller pocket groove is narrow at the top and wide at the bottom, and the lower roller pocket groove is wide at the top and narrow at the bottom. The ball pocket hole composed of the upper roller pocket groove and the lower roller pocket groove is generally wide in the middle and narrow at the upper and lower ends, and matches the shape of the outer rolling body so that the upper and lower ends of the outer rolling body are exposed.

[0013] Furthermore, a plurality of cage edge pockets are circumferentially distributed on the inner circumferential surface of the outer ball split cage, and the cage edge pockets include an edge upper pocket groove located on the outer upper frame plate and an edge lower pocket groove located on the outer lower frame plate, the edge upper pocket groove and the edge lower pocket groove are butted together to form a cage edge pocket groove that matches the shape of the cage connecting ball, the cage connecting ball is nested in the cage edge pocket groove and a part of it protrudes from the cage edge pocket groove, the protruding part is in rolling contact with the outer circumferential surface of the short cylindrical roller split cage of the limiting intermediate rolling body, and the outer circumferential surface of the short cylindrical roller split cage is provided with a groove that matches the cage connecting ball.

[0014] Compared with the prior art, the present invention is beneficial in that:

[0015] 1. The present invention replaces the traditional cylindrical rollers with three rows of rolling bodies in the upper and lower rows (including outer ball rollers, short cylindrical rollers in the middle row and inner ball rollers). The contact between the rolling body and the raceway is changed from the original line contact to two point contacts and one short line contact. The design weakens the spin defect caused by the speed difference at both ends when the axial cylindrical roller rolls around the axis, weakens the sliding friction caused by the different speeds inside and outside the roller, and reduces the friction torque of the bearing;

[0016] 2. The present invention uses three rows of rolling elements in the upper and lower rows to replace the traditional cylindrical rollers. When the turntable bearing is subjected to a large axial load, the force is changed from one row of cylindrical rollers bearing all the load to three rows of rolling elements bearing the load together, which divides the axial load, thereby optimizing the bearing force and further improving the bearing stiffness and load-bearing capacity;

[0017] 3. The cages in the present invention are all split cages made of brass material. The pockets are generally wide in the middle and narrow at the top and bottom, corresponding to the shape of the steel ball or short cylindrical roller, which accurately limits the position of the rolling body and ensures the stability of the rolling body during movement. When the steel ball or short cylindrical roller is installed in the pocket, the split cage is positioned by the steel ball or short cylindrical roller, and the two parts of the cage are connected by rivets, avoiding unnecessary contact between the cage and the inner and outer rings, thereby reducing the friction resistance of the bearing during operation;

[0018] 4. The present invention adopts the design of three rows of rolling element cages in the upper and lower rows, and a few pocket grooves are opened on the inner circumferential surface of the cage of the outer rolling element and the outer circumferential surface of the cage of the inner rolling element, and cage connecting balls with smaller diameters are arranged, and grooves are provided on the left and right sides of the cage of the middle row. Therefore, the sliding friction between adjacent cages can be converted into rolling friction to reduce the running resistance of the bearing, and the running trajectory of the rolling element can be corrected through the coordination of the cages to ensure the normal operation of the bearing.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following specifically cites a preferred embodiment and describes it in detail with the accompanying drawings as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the longitudinal cross-sectional structure of an embodiment of a low-friction and high-load bearing ball-column slewing bearing of the present invention;

[0021] Figure 2 for Figure 1 Schematic diagram of contact between adjacent cages of the same row of rolling elements;

[0022] Figure 3 for Figure 1 Schematic diagram of the three-dimensional structure of the inner side ball split cage;

[0023] Figure 4 for Figure 1 Top view of the inner side ball split cage;

[0024] Figure 5 for Figure 1 Schematic diagram of the three-dimensional structure of the medium and short cylindrical roller split cage;

[0025] Figure 6 for Figure 1 Top view of the medium and short cylindrical roller split cage;

[0026] Figure 7 for Figure 1 Schematic diagram of the three-dimensional structure of the center and outer side ball split cage;

[0027] Figure 8 for Figure 1 Top view of the center and outer side ball split cage;

[0028] Fig. 9 for Figure 1 Schematic diagram of the arrangement of rolling elements in the same row.

[0029] [Reference Signs]

[0030] 1. First inner ring, 2. Inner ball split cage, 201. Inner upper frame, 202. Inner lower frame, 3. Short cylindrical roller split cage, 301. Middle upper frame, 302. Middle lower frame, 4. Outer ball split cage, 401. Outer upper frame, 402. Outer lower frame, 5. Outer ring, 6. Outer ring fixing hole, 7. Second inner ring, 8. Connecting screw, 9. Inner rolling element, 10. Middle rolling element, 11. Outer rolling element, 12. Radial rolling element, 13. Ball pocket, 14. Rivet, 15. Cage edge pocket, 1501. Edge upper pocket, 1502. Edge lower pocket, 16. Cage connecting ball, 17. Short cylindrical roller pocket. DETAILED DESCRIPTION

[0031] 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.

[0032] An embodiment of a low-friction and high-load bearing ball-column composite turntable bearing of the present invention is as follows: Figures 1 to 9 The low-friction and high-load ball-column composite turntable bearing of the present invention is similar to the conventional turntable bearing in terms of main structure, and both include an inner ring (including a first inner ring 1 and a second inner ring 7) and an outer ring 5. In the embodiment of the present invention, as Figure 1 As shown, the outer ring 5 is an annular body, and the cross-sectional shape of the inner ring (the first inner ring 1 and the second inner ring 7) is an I-shaped, so that the outer circumferential surface of the inner ring forms an annular groove, and the outer ring 5 is nested in the annular groove. The cross-sectional shape of the first inner ring 1 is T-shaped, and the cross-sectional shape of the second inner ring 7 is I-shaped. Figure 1 Taking the shown orientation as an example, the lower end of the first inner ring 1 is connected to the second inner ring 7, and the two are connected and installed to form an inner ring with an I-shaped cross-section. In this embodiment, the first inner ring 1 and the second inner ring 7 are fixed by connecting screws 8 that are simultaneously penetrated through the first inner ring 1 and the second inner ring 7, thereby realizing a split design of the inner ring and facilitating the installation of the bearing.

[0033] The outer ring 5 is provided with an outer ring fixing hole 6 at the portion outside the annular groove, and the outer ring 5 is fixed to the base through the outer ring fixing hole 6. In this embodiment, multiple outer ring fixing holes 6 are distributed circumferentially on the outer ring 5, so that the turntable bearing is accurately mounted on the base. The first inner ring 1 and the second inner ring 7 are provided with multiple through holes at corresponding positions in the circumferential direction, so that the first inner ring 1 and the second inner ring 7 can be stably connected and fixed by connecting screws to realize the assembly of the bearing.

[0034] The upper surface of the outer ring 5 and the lower surface of the upper end of the first inner ring 1 are matched through the inner rolling body 9, the middle rolling body 10 and the outer rolling body 11 to achieve rolling cooperation between the outer ring 5 and the upper end of the first inner ring 1; the inner circumferential surface of the outer ring 5 and the outer circumferential surface of the lower end of the first inner ring 1 are matched through the radial rolling body 12 to achieve rolling cooperation between the outer ring 5 and the lower end of the first inner ring 1; the lower surface of the outer ring 5 and the upper surface of the second inner ring 7 are matched through the inner rolling body 9, the middle rolling body 10 and the outer rolling body 11 to achieve rolling cooperation between the outer ring 5 and the second inner ring 7. In this embodiment, the inner rolling body 9 and the outer rolling body 11 are both spherical rollers, the middle rolling body 10 and the radial rolling body 12 are both cylindrical rollers, and the middle rolling body 10 is a short cylindrical roller. In this embodiment, the cylindrical roller adopts logarithmic modification.

[0035] In the axial direction of the turntable bearing of the present invention, the upper and lower surfaces of the outer ring 5 are matched with the first inner ring 1 and the second inner ring 7 through the corresponding inner rolling body 9, the middle rolling body 10, and the outer rolling body 11. There is a row of rolling bodies between the outer ring 5 and the first inner ring 1 and the second inner ring 7, respectively. Each row of rolling bodies has three rows of rolling bodies, and the three rows of rolling bodies are respectively the inner rolling body 9, the middle rolling body 10, and the outer rolling body 11. The structure and matching of the rolling bodies in the upper and lower rows of the outer ring 5 are consistent. A groove (a raceway in which the rolling body can roll) is provided at the corresponding positions of the lower surface of the upper end of the first inner ring 1 and the upper surface of the outer ring 5. A groove is also provided at the corresponding positions of the upper surface of the second inner ring 7 and the lower surface of the outer ring 5, the outer circumferential surface of the lower end of the first inner ring 1, and the inner circumferential surface of the outer ring 5, so that the rolling body can roll normally in the corresponding groove.

[0036] The cages used in the present invention are all split cages made of brass material. The inner rolling element 9, the middle rolling element 10, and the outer rolling element 11 above or below the outer ring 5 are all limited by the corresponding split cages, and each row of rolling elements is limited by a cage. Fig. 9 As shown, each row of inner rolling elements 9, middle rolling elements 10, outer rolling elements 11 and the corresponding split retaining frames limited by the corresponding split retaining frames are concentrically arranged from the inside to the outside between the outer ring 5 and the first inner ring 1 or the second inner ring 7.

[0037] The inner ball split retainer 2 for limiting the inner rolling element 9 is as follows Figure 3 , Figure 4As shown, the inner ball split retainer 2 includes an inner upper frame sheet 201 and an inner lower frame sheet 202, both of which are in the shape of annular sheets. The inner upper frame sheet 201 and the inner lower frame sheet 202 are butted against each other and fixed by rivets 14. The corresponding positions of the inner upper frame sheet 201 and the inner lower frame sheet 202 where the inner rolling body 9 is installed are respectively provided with an upper roller pocket groove and a lower roller pocket groove. The upper roller pocket groove is narrow at the top and wide at the bottom, while the lower roller pocket groove is wide at the top and narrow at the bottom, so that the upper roller pocket groove and the lower roller pocket groove at the corresponding positions together form a ball pocket hole 13 for the inner rolling body 9 to be matched and assembled. The formed ball pocket hole 13 is generally wide in the middle and narrow at the upper and lower ends, and matches the shape of the inner rolling body 9, and only the upper and lower ends of the inner rolling body 9 are exposed to match with the inner ring (the first inner ring 1 or the second inner ring 7) and the outer ring 5. The position of the inner rolling body 9 is accurately limited by the ball pocket hole 13, ensuring the stability of the inner rolling body 9 during movement. After the inner rolling body 9 is fitted and installed in the ball pocket hole 13, the inner ball split retainer 2 can also be positioned by the inner rolling body 9, avoiding unnecessary contact between the inner ball split retainer 2 and the inner ring and outer ring 5, thereby reducing the friction resistance of the bearing during operation.

[0038] The short cylindrical roller split cage 3 used to limit the intermediate rolling element 10 is as follows Figure 5 , Figure 6 As shown, the short cylindrical roller split retainer 3 includes an intermediate upper frame sheet 301 and an intermediate lower frame sheet 302, both of which are in the shape of annular sheets. The intermediate upper frame sheet 301 and the intermediate lower frame sheet 302 are stacked up and down and fixedly connected by rivets 14. The corresponding positions of the intermediate upper frame sheet 301 and the intermediate lower frame sheet 302 where the intermediate rolling body 10 is installed are respectively provided with an upper roller pocket groove and a lower roller pocket groove. The upper roller pocket groove is narrow at the top and wide at the bottom, while the lower roller pocket groove is wide at the top and narrow at the bottom, so that the upper roller pocket groove and the lower roller pocket groove at the corresponding position together form a short cylindrical roller pocket hole 17 for the intermediate rolling body 10 to be assembled. The short cylindrical roller pocket hole 17 is generally wide in the middle and narrow at the upper and lower ends, and matches the shape of the intermediate rolling body 10, and only the upper and lower ends of the intermediate rolling body 10 are exposed to cooperate with the inner ring (the first inner ring 1 or the second inner ring 7) and the outer ring 5. The intermediate rolling element 10 is horizontally placed on the short cylindrical roller split cage 3, and the exposed parts at both ends are circumferential surfaces.

[0039] The outer ball split retainer 4 for limiting the outer rolling body 11 is as shown in FIG. Figure 7 , Figure 8As shown, the outer ball split retainer 4 includes an outer ring-shaped upper frame sheet 401 and an outer lower frame sheet 402, which are stacked up and down and connected by rivets 14. The corresponding positions of the outer upper frame sheet 401 and the outer lower frame sheet 402 where the outer rolling body 11 is installed are respectively provided with roller upper pocket grooves and roller lower pocket grooves, the roller upper pocket groove is narrow at the top and wide at the bottom, and the roller lower pocket groove is wide at the top and narrow at the bottom, so that the roller upper pocket groove and the roller lower pocket groove at the corresponding position together form a ball pocket hole 13 for the outer rolling body 11 to be matched and assembled. The formed ball pocket hole 13 is generally wide in the middle and narrow at the upper and lower ends, and matches the shape of the outer rolling body 11, and only the upper and lower ends of the outer rolling body 11 are exposed to match the inner ring (the first inner ring 1 or the second inner ring 7) and the outer ring 5.

[0040] like Figure 2 As shown, the outer circumferential surface of the inner ball split cage 2 is circumferentially distributed with a plurality of cage edge pockets 15, the cage edge pockets 15 include an upper edge pocket 1501 located on the inner upper frame plate 201 and a lower edge pocket 1502 located on the inner lower frame plate 202, the upper edge pocket 1501 and the lower edge pocket 1502 are butted together to form a cage edge pocket 15 that matches the shape of the cage connection ball 16, a portion of the cage connection ball 16 protrudes from the cage edge pocket 15, and the protruding portion is in rolling contact with the inner circumferential surface of the short cylindrical roller split cage 3, and the inner circumferential surface of the short cylindrical roller split cage 3 is provided with a groove that matches the cage connection ball 16. The diameter of the cage connection ball 16 is smaller than the diameter of the inner rolling body 9, so that the cage connection ball 16 only protrudes from the outer circumferential surface of the inner ball split cage 2.

[0041] Similarly, the inner circumferential surface of the outer ball split retainer 4 also has a plurality of retainer edge pockets 15 distributed circumferentially, and the retainer edge pockets 15 include an upper edge pocket 1501 located on the outer upper frame plate 401 and a lower edge pocket 1502 located on the outer lower frame plate 402. The upper edge pocket 1501 and the lower edge pocket 1502 are butted together to form a retainer edge pocket 15 that matches the shape of the retainer connecting ball 16. A portion of the retainer connecting ball 16 protrudes from the retainer edge pocket 15, and the protruding portion is in rolling contact with the outer circumferential surface of the short cylindrical roller split retainer 3. The outer circumferential surface of the short cylindrical roller split retainer 3 is provided with a groove that matches the retainer connecting ball 16.

[0042] The outer circumference of the inner ball split cage 2 and the inner circumference of the outer ball split cage 4 in the upper and lower rows of the bearing are both provided with a small number of cage edge grooves 15, and the cage connecting balls 16 with smaller diameters are nested. The inner and outer circumference of the short cylindrical roller split cage 3 are both provided with grooves, so that the sliding friction between it and the adjacent cages is converted into rolling friction, thereby reducing the friction resistance of the bearing during operation.

[0043] In this embodiment, the steps for installing the inner rolling element 9, the middle rolling element 10, the outer rolling element 11 and the corresponding retaining frame are as follows:

[0044] (1) The inner rolling element 9 is matched with the roller upper pocket groove and the roller lower pocket groove of the inner ball split cage 2 respectively, and the cage connecting ball 16 is matched with the edge upper pocket groove 1501 and the edge lower pocket groove 1502 of the inner ball split cage 2 respectively, and then the inner upper frame plate 201 and the inner lower frame plate 202 are fixed with rivets 14, and the inner rolling element 9 and the cage connecting ball 16 are limited at the corresponding positions of the inner ball split cage 2;

[0045] (2) The intermediate rolling element 10 is matched with the roller upper pocket groove and the roller upper pocket groove of the short cylindrical roller split cage 3 respectively, and the intermediate upper frame plate 301 and the intermediate lower frame plate 302 are fixed with rivets 14 to limit the intermediate rolling element 10 in the short cylindrical roller split cage 3;

[0046] (3) The outer rolling body 11 is respectively matched with the roller upper pocket groove and the roller lower pocket groove of the outer ball split retainer 4, and the retainer connecting ball 16 is respectively matched with the edge upper pocket groove 1501 and the edge lower pocket groove 1502 on the outer ball split retainer 4, and the outer upper frame plate 401 and the outer lower frame plate 402 are fixed with rivets 14, and the outer rolling body 11 and the retainer connecting ball 16 are limited at the corresponding positions of the outer ball split retainer 4.

[0047] The process of assembling the inner rolling element 9, the middle rolling element 10 and the outer rolling element 11 of the same row in the corresponding cage can be carried out simultaneously. First, the inner lower frame piece 202, the middle lower frame piece 302 and the outer lower frame piece 402 are concentrically nested in sequence, and then the inner rolling element 9, the middle rolling element 10 and the outer rolling element 11 are placed in the corresponding roller lower pocket grooves of the inner lower frame piece 202, the middle lower frame piece 302 and the outer lower frame piece 402 in sequence. When the retaining frame connecting ball 16 is placed in the edge lower pocket groove 1502 of the inner lower frame plate 202 and the outer lower frame plate 402, and then the inner upper frame plate 201, the middle upper frame plate 301 and the outer upper frame plate 401 are covered, and the inner lower frame plate 202 and the inner upper frame plate 201, the middle lower frame plate 302 and the middle upper frame plate 301, and the outer lower frame plate 402 and the outer upper frame plate 401 are fixed with rivets 14 to complete the installation of the rolling elements and retaining frames in the same row.

[0048] The upper row of rollers are sleeved on the lower end of the first inner ring 1 and contact with the lower surface of the upper end of the first inner ring 1, and the rollers are nested in the corresponding grooves; then the outer ring 5 is sleeved on the lower end of the first inner ring 1 and contacted with the corresponding rollers in the upper row. While installing the outer ring 5, the radial rolling body 12 is installed between the inner circumferential surface of the outer ring 5 and the outer circumferential surface of the lower end of the first inner ring 1; the lower row of rollers are sleeved on the lower end of the first inner ring 1 and contacted with the lower surface of the outer ring 5; finally, the second inner ring 7 is connected to the first inner ring 1, the groove of the second inner ring 7 contacts with the corresponding rollers in the lower row, and the first inner ring 1 and the second inner ring 7 are fixed with the connecting screws 8 to realize the assembly of the bearing.

[0049] Although embodiments of the present invention 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 invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A low-friction, high-load ball-column composite turntable bearing, comprising an inner ring, an outer ring (5) rotatably arranged on the outer periphery of the inner ring, a row of rolling elements arranged between the two side surfaces of the outer ring (5) and the inner ring, and a plurality of radial rolling elements (12) distributed circumferentially between the inner circumferential surface of the outer ring (5) and the inner ring, characterized in that: Each row of rolling elements comprises three columns of rolling elements arranged concentrically, and the three columns of rolling elements are, from the inside to the outside, an inner rolling element (9), a middle rolling element (10), and an outer rolling element (11) distributed in an annular direction, respectively. Each column of rolling elements is limited by a corresponding split retainer, and the split retainer comprises an upper frame plate and a lower frame plate arranged in a stacked manner. The upper frame plate and the lower frame plate are respectively provided with an upper pocket groove and a lower pocket groove at the position of limiting the corresponding rolling element, and the upper pocket groove and the lower pocket groove form pocket holes matching the corresponding rolling element; the inner rolling element (9) and the outer rolling element (11) are both spherical rollers, and the middle rolling element (10) and the radial rolling element (12) are both cylindrical rollers; and a retainer connecting ball (16) is arranged between adjacent split retainers.

2. The low-friction and high-load ball-column composite turntable bearing according to claim 1, characterized in that: The inner ring comprises a first inner ring (1) and a second inner ring (7); the cross-sectional shape of the inner ring is an I-shaped shape, so that an annular groove is formed on the outer circumferential surface of the inner ring, and the outer ring (5) is nested in the annular groove; the first inner ring (1) and the second inner ring (7) are detachably connected.

3. The low-friction and high-load ball-column composite turntable bearing according to claim 1, characterized in that: The outer ring (5) is detachably arranged on the base.

4. The low-friction and high-load ball-column composite turntable bearing according to claim 1, characterized in that: The inner ring and the outer ring are both provided with grooves for rolling of the rolling bodies at relative positions.

5. The low-friction and high-load ball-column composite turntable bearing according to claim 1, characterized in that: The split retainer is made of brass material.

6. The low-friction and high-load ball-column composite turntable bearing according to claim 1, characterized in that: The inner rolling body (9) is installed on the inner ball split retaining frame (2), and the inner ball split retaining frame (2) includes an inner upper frame plate (201) and an inner lower frame plate (202) fixed by rivets. The corresponding positions of the inner upper frame plate (201) and the inner lower frame plate (202) where the inner rolling body (9) is installed are respectively provided with an upper roller pocket groove and a lower roller pocket groove. The upper roller pocket groove is narrow at the top and wide at the bottom, and the lower roller pocket groove is wide at the top and narrow at the bottom. The ball pocket hole (13) formed by the upper roller pocket groove and the lower roller pocket groove is generally wide in the middle and narrow at the upper and lower ends, and matches the shape of the inner rolling body (9) so that the upper and lower ends of the inner rolling body (9) are exposed.

7. The low-friction and high-load ball-column composite turntable bearing according to claim 6, characterized in that: The outer circumferential surface of the inner ball split retainer (2) is circumferentially distributed with a plurality of retainer edge pockets (15), the retainer edge pockets (15) comprising an upper edge pocket (1501) located on the inner upper frame plate (201) and a lower edge pocket (1502) located on the inner lower frame plate (202), the upper edge pocket (1501) and the lower edge pocket (1502) being butted together to form a retainer edge pocket (15) matching the shape of a retainer connecting ball (16), the retainer connecting ball (16) being nested in the retainer edge pocket (15) and a portion thereof protruding from the retainer edge pocket (15), the protruding portion being in rolling contact with the inner circumferential surface of a short cylindrical roller split retainer (3) for limiting the intermediate rolling body (10), the inner circumferential surface of the short cylindrical roller split retainer (3) being provided with a groove matching the retainer connecting ball (16).

8. The low-friction and high-load ball-column composite turntable bearing according to claim 1, characterized in that: The intermediate rolling body (10) is mounted on a short cylindrical roller split retaining frame (3), the short cylindrical roller split retaining frame (3) comprising an intermediate upper frame plate (301) and an intermediate lower frame plate (302) fixed by rivets, and the corresponding positions of the intermediate upper frame plate (301) and the intermediate lower frame plate (302) where the intermediate rolling body (10) is mounted are respectively provided with an upper roller pocket groove and a lower roller pocket groove, the upper roller pocket groove is narrow at the top and wide at the bottom, and the lower roller pocket groove is wide at the top and narrow at the bottom, and the short cylindrical roller pocket hole (17) formed by the upper roller pocket groove and the lower roller pocket groove is generally wide in the middle and narrow at both ends, and matches the shape of the intermediate rolling body (10) so that the upper and lower ends of the intermediate rolling body (10) are exposed.

9. The low-friction and high-load ball-column composite turntable bearing according to claim 1, characterized in that: The outer rolling body (11) is mounted on the outer ball split retaining frame (4), and the outer ball split retaining frame (4) comprises an outer upper frame plate (401) and an outer lower frame plate (402) fixed by rivets. The corresponding positions of the outer upper frame plate (401) and the outer lower frame plate (402) where the outer rolling body (11) is mounted are respectively provided with an upper roller pocket groove and a lower roller pocket groove. The upper roller pocket groove is narrow at the top and wide at the bottom, and the lower roller pocket groove is wide at the top and narrow at the bottom. The ball pocket hole (13) formed by the upper roller pocket groove and the lower roller pocket groove is generally wide in the middle and narrow at the upper and lower ends, and matches the shape of the outer rolling body (11) so that the upper and lower ends of the outer rolling body (11) are exposed.

10. The low-friction and high-load ball-column composite turntable bearing according to claim 9, characterized in that: The inner circumferential surface of the outer ball split cage (4) is circumferentially distributed with a plurality of cage edge pockets (15), the cage edge pockets (15) comprising an upper edge pocket (1501) located on the outer upper frame plate (401) and a lower edge pocket (1502) located on the outer lower frame plate (402), the upper edge pocket (1501) and the lower edge pocket (1502) being butted together to form a cage edge pocket (15) matching the shape of the cage connecting ball (16), the cage connecting ball (16) being nested in the cage edge pocket (15) and a portion thereof protruding from the cage edge pocket (15), the protruding portion rollingly contacting with the outer circumferential surface of the short cylindrical roller split cage (3) of the limiting intermediate rolling body (10), the outer circumferential surface of the short cylindrical roller split cage (3) being provided with a groove matching the cage connecting ball (16).

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