Three-row crossed roller wire raceway bearing

Abstract

The invention discloses a three-row crossed roller wire raceway bearing, which relates to the field of bearings, and comprises an upper outer ring frame, a lower outer ring frame, an inner ring frame, a wire raceway and a plurality of cylindrical rollers, the upper outer ring frame and the lower outer ring frame are fixed through bolts to form a concave outer ring frame; the inner ring frame is in a convex shape; the inner ring frame and the outer ring frame are matched to form three mounting grooves; a first retainer is embedded in the first mounting groove, and a second retainer is mounted in the second mounting groove; a third retainer is embedded in the third mounting groove; the first retainer is perpendicular to the second retainer; and the third retainer is in the vertical direction. According to the invention, the retainers are arranged in a crossed manner, and the cylindrical rollers are mounted on the retainers, so that the bearing can bear axial load, radial load and upsetting moment at the same time, and the pre-tightening amount is adjusted by changing the thickness of the gasket through grinding the gasket.

Description

Technical Field

[0001] The invention relates to the field of bearings, and in particular to a three-row crossed roller wire raceway bearing. Background Art

[0002] Wire raceway bearings, as a non-standard bearing, have been widely used in engineering practice. They have appeared in foreign countries for decades, but the research on wire raceway bearings in China has only been around for a decade.

[0003] Wire raceway bearings have advantages that ordinary slewing bearings cannot match, such as light weight, simple structure, small installation space, easy maintenance and replacement, and low cost. At the same time, they have the basic functions of slewing bearings, can withstand axial and radial loads, and can withstand a certain overturning moment. Therefore, wire raceway bearings can completely replace ordinary light slewing bearings in certain usage occasions, achieving the use effect that ordinary slewing bearings cannot achieve.

[0004] The most typical structure of a wire raceway bearing is a three-block solid-surrounding structure, which generally consists of a fixed large table body, a movable syringe seat gear and a clamping ring, which surround the square-section wire raceway bearing in the middle.

[0005] The damage of wire raceway bearings mostly occurs in the raceways and rollers. The raceways cannot be repaired after wear, and new bearings need to be replaced to ensure the operating accuracy of the device. At the same time, in order to meet the rigidity requirements of the bearings, the bearing material requirements are relatively high. The material is generally 42CrMo or 50Mn, and the bearing raceways are partially hardened by medium frequency quenching.

[0006] The outer ring and inner ring of the existing ordinary slewing bearing are both integral structures, and the preload cannot be adjusted according to the application scenario; in addition, due to the material, the ordinary bearing is relatively large in size and heavy in weight, which brings a lot of trouble during transportation and installation, especially in complex working conditions such as military and construction machinery. The loads borne by the bearings are complex. According to the different preloads required by the working environment, the bearings are required to have a lighter weight and a shorter maintenance cycle. Ordinary bearings cannot meet the requirements of this field. Summary of the invention

[0007] Based on the above description, the present invention proposes a three-row crossed roller wire raceway bearing, which uses three rows of cross-arranged wire raceways, two of which are arranged perpendicular to each other and one row is arranged vertically, so that the bearing can simultaneously bear axial load, radial load and overturning moment, and the preload of the bearing can be adjusted by changing the thickness of the grinding gasket.

[0008] The technical solution adopted is: a three-row cross roller wire raceway bearing, including an upper outer ring frame, a lower outer ring frame, an inner ring frame, a wire raceway and a cylindrical roller; the upper outer ring frame and the lower outer ring frame are fixed to the inner side by bolts to form a "concave" outer ring frame; a grinding gasket is installed between the upper outer ring frame and the lower outer ring frame; the inner ring frame is "convex"; the inner ring frame and the outer ring frame cooperate to form a mounting groove, each mounting groove is embedded with a cage, cylindrical rollers are installed on the cage, and wire raceways are matched on both sides of the cylindrical rollers; The inner side of the upper outer ring frame is provided with a first groove and a second groove, the inner side of the lower outer ring frame is provided with a sixth groove; the outer side of the inner ring frame is provided with a third groove, a fourth groove and a fifth groove; The first groove and the third groove are located on the same horizontal line and can match each other to form a first installation groove with a rounded rectangular cross section; a first retaining frame is embedded in the first installation groove; The fifth groove and the sixth groove are located on the same horizontal line and can match each other to form a second installation groove with a rounded rectangular cross section; a second retaining frame is embedded in the second installation groove; The second groove and the fourth groove are located on the same horizontal line and can match each other to form a third installation groove; a third retaining frame is embedded in the third installation groove; The first installation slot has the same structure as the second installation slot; The first retaining frame is in the shape of a truncated cone, and includes a first upper end ring, a first lower end ring and a first body. The diameter of the first upper end ring is smaller than the diameter of the first lower end ring, and the first body is inclined at 45 degrees to the horizontal. A plurality of first roller holes are evenly opened on the first body. A cylindrical roller is installed in each first roller hole. The cross-sections of the first upper end ring and the first lower end ring are semicircular, and the plane ends are respectively fixed on the upper and lower sides of the first body. The first upper end ring and the first lower end ring are respectively matched with the two corresponding fillets of the first mounting groove. The first steel wire raceways are respectively installed on both sides of the cylindrical roller. The first steel wire raceways are located on both sides of the first retaining frame. The cross-section of the first steel wire raceway is semicircular, and its circular end is matched with the other two corresponding fillets of the first mounting groove. The first cage is vertically rotated 180 degrees to become the second cage; The second retaining frame is in the shape of a truncated cone, and includes a second upper end ring, a second lower end ring and a second body. The diameter of the second upper end ring is greater than the diameter of the second lower end ring, and the second body is inclined at 45 degrees to the horizontal. A plurality of second roller holes are evenly opened on the second body. A cylindrical roller is installed in each second roller hole. The cross-section of the second upper end ring and the second lower end ring is semicircular, and the flat ends are respectively fixed on the upper and lower sides of the second body. The second upper end ring and the second lower end ring are respectively matched with the two corresponding fillets of the second mounting groove. Second steel wire raceways are respectively installed on both sides of the cylindrical roller. The second steel wire raceways are respectively located on both sides of the second retaining frame. The cross-section of the second steel wire raceway is semicircular, and the circular ends of the second steel wire raceway are respectively matched with the other two corresponding fillets of the second mounting groove. A plurality of third roller holes are evenly opened on the third retaining frame; a cylindrical roller is installed in each third roller hole; third steel wire raceways are installed on both sides of the cylindrical roller, and the cross section of the third steel wire raceway is semicircular, and its circular ends are matched with the second groove and the fourth groove respectively.

[0009] Furthermore, the first roller hole, the second roller hole and the third roller hole are rectangular.

[0010] Furthermore, the rotation centerline of the cylindrical rollers in the first mounting groove and the second mounting groove forms an angle of 45° with the rotation centerline of the bearing.

[0011] Furthermore, the rotation centerline of the cylindrical roller in the third mounting groove is parallel to the rotation centerline of the bearing.

[0012] Furthermore, the grinding gasket is circular and is formed by splicing a plurality of fan-shaped pieces.

[0013] Furthermore, the first retaining frame and the second retaining frame are perpendicular to each other, that is, the cylindrical rollers in the first mounting groove and the cylindrical rollers in the second mounting groove are arranged perpendicularly and crosswise.

[0014] The present invention has a simple structure. The inner concave outer ring frame is formed by fixing an upper outer ring frame and a lower outer ring frame by bolts. A grinding gasket is provided between the upper outer ring frame and the lower outer ring frame. A preload force is applied between the two to ensure that there is no gap between the cylindrical roller and the wire raceway due to the overturning moment during the operation of the entire bearing. The inner ring frame and the outer ring frame are made of light alloy materials, such as hard aluminum or super hard aluminum, which can effectively reduce the weight and moment of inertia of the bearing.

[0015] The invention has high precision. The wire raceway is made of high-hardness spring steel and is embedded in the grooves of the inner ring frame, the upper outer ring frame and the lower outer ring frame. The wire raceway itself is elastic and can well realize small clearance and pre-interference of the bearing assembly. Even if the diameter of the bearing is large, high precision can be achieved. After the wire raceway is damaged, it can be quickly disassembled and replaced, which greatly shortens the maintenance cycle and reduces the maintenance cost.

[0016] The first retainer in the first mounting groove and the second retainer in the second mounting groove are arranged vertically, realizing vertical cross arrangement of cylindrical rollers, and the rotation center of the cylindrical rollers forms an angle of 45° with the rotation center of the bearing. The present invention can withstand axial force and radial force at the same time; the third retainer in the third mounting groove is vertical, and the cylindrical rollers are arranged in a vertical direction, which can withstand overturning moment, realizing that the application range of the bearing is greatly increased.

[0017] The first cage, the second cage and the third cage can not only play the role of raceways but also make the cylindrical rollers evenly arranged in the circumferential direction, thus shortening the assembly time; the preload of the bearing can be adjusted by grinding the gasket to meet the application of different working conditions; when subjected to vibration loads, the deformation of the wire raceway can play a role in buffering and shock absorption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of a three-row cross roller wire raceway bearing of the present invention; Figure 2 It is a cross-sectional schematic diagram of a three-row crossed roller wire raceway bearing of the present invention; Figure 3 for Figure 2 Enlarged view of part A in the middle; Figure 4 It is a schematic diagram of the structure of the first mounting slot, the second mounting slot and the third mounting slot in the present invention; Figure 5 It is a schematic structural diagram of the first retaining frame in the first mounting groove of the present invention; Figure 6 for Figure 5 Enlarged view of middle part B; Figure 7 A schematic diagram of the structure of the second retainer in the second mounting groove of the present invention; Figure 8 for Figure 7 Enlarged view of the middle C part; Fig. 9 is a schematic structural diagram of the third retaining frame in the third mounting groove of the present invention; Fig.10 for Fig. 9 Enlarged view of the middle D part; Fig.11 It is a schematic diagram of the structure of the first retaining frame at a 45-degree angle.

[0019] In the figure, 1, upper outer ring frame; 2, lower outer ring frame; 3, inner ring frame; 4, wire raceway and cylindrical roller; 5, grinding pad; 11, first groove; 12, second groove; 31, third groove; 32, fourth groove; 33, fifth groove; 21, sixth groove; 7, first mounting groove; 71, first retaining frame; 72, first wire raceway; 8, second mounting groove; 81, second retaining frame; 82, second wire raceway; 9, third mounting groove; 91, third retaining frame; 92, third wire raceway; 711, first upper end ring; 712, first lower end ring; 713, first body; 811, second upper end ring; 812, second lower end ring; 813, second body. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings and by examples. The following examples are for explaining the present invention and the present invention is not limited to the following examples. In this example, the center of the bearing is the center, the part of the same part close to the center is the inner side, and the part far from the center is the outer side.

[0021] See also Figures 1 to 11 As shown, the three-row cross roller wire raceway bearing includes an upper outer ring frame 1, a lower outer ring frame 2, an inner ring frame 3, a wire raceway and a cylindrical roller 4; the upper outer ring frame 1 and the lower outer ring frame 2 are fixed to the inner side by bolts to form a "concave" outer ring frame; a grinding gasket 5 is installed between the upper outer ring frame 1 and the lower outer ring frame 2; the grinding gasket is circular and is composed of several fan-shaped pieces. The preload range of the grinding gasket is generally between 0.02 and 0.03 mm. The preload method is to adjust the gasket thickness by grinding and preloading according to the actual size measurement. Generally, the interference is 0.02 to 0.03 mm. In order to ensure the accuracy requirements of the bearings during use, they need to be replaced regularly according to different use environments; different preload amounts are selected according to different operating conditions, and the required preload amount is achieved by replacing grinding gaskets of different thicknesses; the bolts fixing the upper outer ring frame 1 and the lower outer ring frame 2 are loosened, the fan-shaped pieces are pulled out, and new grinding gaskets are installed, and the upper outer ring frame and the lower outer ring frame are fixed with bolts again to achieve the required preload amount.

[0022] The inner ring frame 3 is convex; the inner ring frame 3 cooperates with the outer ring frame to form three installation grooves; The inner side of the upper outer ring frame 1 is provided with a first groove 11 and a second groove 12, and the inner side of the lower outer ring frame 2 is provided with a sixth groove 21; the outer side of the inner ring frame 3 is provided with a third groove 31, a fourth groove 32 and a fifth groove 33; The first groove 11 and the third groove 31 are located on the same horizontal line and can match each other to form a first installation groove 7 with a rounded rectangular cross section; a first retaining frame 71 is embedded in the first installation groove 7; The fifth groove 33 and the sixth groove 21 are located on the same horizontal line and can be matched with each other to form a second installation groove 8 with a rounded rectangular cross section; a second retainer 81 is embedded in the second installation groove 8; The second groove 12 and the fourth groove 32 are located on the same horizontal line and can cooperate with each other to form a third mounting groove 9; a third retaining frame 91 is embedded in the third mounting groove 9; the rotation centerline of the cylindrical roller in the third mounting groove 9 is parallel to the rotation centerline of the bearing.

[0023] The first mounting groove 7 and the second mounting groove 8 have the same structure; the rotation centerline of the cylindrical rollers in the first mounting groove 7 and the second mounting groove 8 forms an angle of 45° with the rotation centerline of the bearing.

[0024] The first retainer 71 is truncated cone-shaped, and includes a first upper end ring 711, a first lower end ring 712 and a first body 713. The diameter of the first upper end ring 711 is smaller than the diameter of the first lower end ring 712, and the first body 713 is inclined at 45 degrees to the horizontal. A plurality of first roller holes are evenly opened on the first body 713. A cylindrical roller 4 is installed in each first roller hole. The cross-sections of the first upper end ring 711 and the first lower end ring 712 are semicircular, and their plane ends are respectively fixed on the upper and lower sides of the first body 713. The first upper end ring 711 and the first lower end ring 712 are respectively matched with two corresponding fillets of the first mounting groove 7. The first steel wire raceways 72 are respectively installed on both sides of the cylindrical roller 4. The first steel wire raceways 72 are located on both sides of the first retainer 71. The cross-section of the first steel wire raceway 72 is semicircular, and the circular ends of the first steel wire raceway 72 are respectively matched with the other two corresponding fillets of the first mounting groove 7. The first retainer 71 is vertically rotated 180 degrees to form the second retainer 81. The installation positions of the first retainer 71 and the second retainer 81 are perpendicular to each other, that is, the cylindrical roller 4 in the first installation groove 7 is vertically arranged in a cross manner with the cylindrical roller 4 in the second installation groove 8. The rotation centerline of the cylindrical roller in the third installation groove 9 is parallel to the rotation centerline of the bearing.

[0025] The second retaining frame 81 is in a truncated cone shape, including a second upper end ring 811, a second lower end ring 812 and a second body 813. The diameter of the second upper end ring 811 is larger than the diameter of the second lower end ring 812, and the second body is inclined at 45 degrees to the horizontal. A plurality of second roller holes are evenly opened on the second body 813. A cylindrical roller 4 is installed in each second roller hole. The cross-section of the second upper end ring 811 and the second lower end ring 812 is semicircular, and the flat ends are respectively fixed on the upper and lower sides of the second body 813. The circular ends of the second upper end ring 811 and the second lower end ring 812 are respectively matched with the two corresponding fillets of the second mounting groove 8. The second steel wire raceway 82 is respectively installed on both sides of the cylindrical roller 4. The second steel wire raceway 82 is located on both sides of the second retaining frame 81. The cross-section of the second steel wire raceway 82 is semicircular, and its circular ends are respectively matched with the other two corresponding fillets of the second mounting groove 8. The third retainer 91 is evenly provided with a plurality of third roller holes; a cylindrical roller 4 is installed in each third roller hole; and third steel wire raceways 92 are installed on both sides of the cylindrical roller 4. The third steel wire raceway 92 has a semicircular cross section, and its circular ends are matched with the second groove 12 and the fourth groove 32 respectively.

[0026] The first roller hole, the second roller hole and the third roller hole are rectangular.

Claims

1. Three-row cross roller wire raceway bearing, characterized by: It includes an upper outer ring frame, a lower outer ring frame, an inner ring frame, a wire raceway and a cylindrical roller; the upper outer ring frame and the lower outer ring frame are fixed to the inner side by bolts to form a "concave" outer ring frame; a grinding gasket is installed between the upper outer ring frame and the lower outer ring frame; the inner ring frame is "convex"; the inner ring frame and the outer ring frame are matched to form a mounting groove, each mounting groove is embedded with a retainer, a cylindrical roller is installed on the retainer, and the two sides of the cylindrical roller are matched with wire raceways; The inner side of the upper outer ring frame is provided with a first groove and a second groove, the inner side of the lower outer ring frame is provided with a sixth groove; the outer side of the inner ring frame is provided with a third groove, a fourth groove and a fifth groove; The first groove and the third groove are located on the same horizontal line and can match each other to form a first installation groove with a rounded rectangular cross section; a first retaining frame is embedded in the first installation groove; The fifth groove and the sixth groove are located on the same horizontal line and can match each other to form a second installation groove with a rounded rectangular cross section; a second retaining frame is embedded in the second installation groove; The second groove and the fourth groove are located on the same horizontal line and can match each other to form a third installation groove; a third retaining frame is embedded in the third installation groove; The first installation slot has the same structure as the second installation slot; The first retaining frame is in a truncated cone shape, including a first upper end ring, a first lower end ring and a first body, the diameter of the first upper end ring is smaller than the diameter of the first lower end ring, and the first body is inclined at 45 degrees to the horizontal; a plurality of first roller holes are evenly opened on the first body; a cylindrical roller is installed in each first roller hole; the cross-sections of the first upper end ring and the first lower end ring are semicircular, and the plane ends are respectively fixed on the upper and lower sides of the first body; the first upper end ring and the first lower end ring are respectively matched with the two corresponding fillets of the first mounting groove; the first steel wire raceways are respectively installed on both sides of the cylindrical roller; the first steel wire raceways are located on both sides of the first retaining frame; the cross-section of the first steel wire raceway is semicircular, and the circular ends are matched with the other two corresponding fillets of the first mounting groove; The first retaining frame is vertically rotated 180 degrees to become the second retaining frame; The second retaining frame is in a truncated cone shape, including a second upper end ring, a second lower end ring and a second body, the diameter of the second upper end ring is larger than the diameter of the second lower end ring, and the second body is inclined at 45 degrees to the horizontal; a plurality of second roller holes are evenly opened on the second body; a cylindrical roller is installed in each second roller hole; the second upper end ring and the second lower end ring have a semicircular cross-section, and the flat ends are respectively fixed on the upper and lower sides of the second body; the second upper end ring and the second lower end ring are respectively matched with the two corresponding fillets of the second mounting groove; second steel wire raceways are respectively installed on both sides of the cylindrical roller; the second steel wire raceways are respectively located on both sides of the second retaining frame; the cross-section of the second steel wire raceway is semicircular, and the circular ends of the second steel wire raceway are respectively matched with the other two corresponding fillets of the second mounting groove; The third retaining frame is evenly provided with a plurality of third roller holes; a cylindrical roller is installed in each third roller hole; third steel wire raceways are installed on both sides of the cylindrical roller, and the cross section of the third steel wire raceway is semicircular, and its circular ends are respectively matched with the second groove and the fourth groove.

2. The three-row crossed roller wire raceway bearing according to claim 1, characterized in that The first roller hole, the second roller hole and the third roller hole are rectangular.

3. The three-row crossed roller wire raceway bearing according to claim 1, characterized in that The rotation centerline of the cylindrical roller in the first mounting groove and the second mounting groove forms an angle of 45° with the rotation centerline of the bearing.

4. The three-row crossed roller wire raceway bearing according to claim 1, characterized in that The rotation center line of the cylindrical roller in the third mounting groove is parallel to the rotation center line of the bearing.

5. The three-row crossed roller wire raceway bearing according to claim 1, characterized in that The grinding pad is circular and is formed by splicing a plurality of fan-shaped pieces.

6. The three-row crossed roller wire raceway bearing according to claim 1, characterized in that The first retaining frame and the second retaining frame are perpendicular to each other, that is, the cylindrical rollers in the first mounting groove and the cylindrical rollers in the second mounting groove are arranged perpendicularly and crosswise.

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