High-precision roller pin and thrust roller combined bearing

Abstract

The utility model discloses a high-precision needle roller and thrust roller combined bearing, which belongs to the technical field of combined bearings and comprises at least three thrust shaft washers, two needle roller inner rings and two needle roller bearing outer rings, and the thrust shaft washers and the needle roller inner rings are attached at intervals; the outer diameter of the needle roller inner ring is smaller than that of the thrust shaft ring, and the width of the needle roller inner ring is larger than that of the needle roller bearing outer ring; a mounting raceway is formed on the outer side of the needle roller inner ring between the adjacent thrust shaft ring and needle bearing outer ring, and a thrust roller assembly is correspondingly sleeved in the mounting raceway on the periphery of the needle roller inner ring; the inner wall of the needle roller bearing outer ring is provided with a needle roller path, and the periphery of the needle roller inner ring is located in the needle roller path and correspondingly sleeved with a centripetal needle roller assembly. According to the utility model, the axial clearance between the bearings when a plurality of bearings are matched can be effectively eliminated, and the axial matching precision of the bearings is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of combined bearings, in particular to a high-precision needle roller and thrust roller combined bearing. Background Art

[0002] Combined bearings are rolling bearings designed for bidirectional load bearings, comprised of two or more bearing structures. They are widely used in machine tools, metallurgy, printing, and other mechanical equipment. Common combinations include needle roller and thrust ball combination bearings, needle roller and angular contact ball combination bearings, and needle roller and thrust roller combination bearings. In needle roller and thrust roller combination bearings, the radial needle roller structure is designed to carry radial loads, while the thrust roller structure is designed to carry axial loads. To save space and increase strength, the outer ring end faces of the radial needle roller structure are typically machined to form the thrust roller bearing raceways. The thrust rolling element assembly and thrust shaft ring are then placed to form a complete bearing set.

[0003] When needle roller and thrust roller combination bearings are used to carry axial loads, the presence of axial clearance within the bearings will directly affect the axial positioning accuracy of the equipment. Therefore, for some precision mechanical equipment with high axial positioning accuracy requirements, the combined bearings used are often required to have zero internal axial clearance. For high-precision needle roller and thrust roller combination bearings, the required requirements can be achieved through precision grinding and assembly of the bearing inner and outer rings and thrust shaft rings. However, in use, due to the load requirements of the equipment, two or even more sets of combined bearings are sometimes installed in parallel at one or both ends to carry greater loads. When multiple sets of combined bearings are installed in parallel, how to eliminate the axial installation clearance between the bearings becomes a difficult problem. Utility Model Content

[0004] Technical problem solved: In response to the problems existing in the prior art, the utility model provides a high-precision needle roller and thrust roller combined bearing, which can effectively eliminate the axial clearance between the bearings when multiple sets of bearings are matched, and improve the axial matching accuracy of the bearings.

[0005] Technical solution: The utility model discloses a high-precision needle roller and thrust roller combined bearing, which comprises at least three thrust shaft rings, two needle roller inner rings and two needle roller bearing outer rings, wherein the thrust shaft rings and the needle roller inner rings are spaced and fitted together;

[0006] The outer diameter of the needle roller inner ring is smaller than the outer diameter of the thrust shaft ring, and the width of the needle roller inner ring is larger than the width of the needle roller bearing outer ring; a mounting raceway is formed between the adjacent thrust shaft ring and the needle roller bearing outer ring on the outer side of the needle roller inner ring, and a thrust roller assembly is correspondingly mounted in the mounting raceway on the outer periphery of the needle roller inner ring;

[0007] The inner wall of the outer ring of the needle roller bearing is provided with a needle roller raceway, and the outer periphery of the needle roller inner ring is located in the needle roller raceway and is correspondingly provided with a centripetal needle roller assembly.

[0008] Preferably, the corresponding needle roller bearing outer ring, needle roller inner ring and radial needle roller assembly constitute a radial needle roller bearing for carrying the radial load of the bearing.

[0009] Preferably, the radial needle roller assembly includes a needle roller cage correspondingly clamped between the outer ring of the needle roller bearing and the inner ring of the needle roller. The needle roller cage is circumferentially provided with a plurality of radial needle rollers accommodated in the needle roller raceway.

[0010] Preferably, the corresponding thrust shaft ring, thrust roller assembly and needle roller bearing outer ring form a thrust bearing for carrying the axial load of the bearing.

[0011] Preferably, the thrust roller assembly includes a roller cage that is correspondingly sleeved on the outside of the needle roller inner ring and located in the mounting raceway. The roller cage is circumferentially provided with multiple thrust rollers, and the two ends of the thrust rollers respectively abut against the side walls of the thrust shaft ring and the outer ring of the needle roller bearing.

[0012] Compared with the prior art, the present invention has at least the following beneficial effects:

[0013] 1. The utility model replaces the original form of stacking and combining multiple sets of bearings with a single set of combined bearings, which can effectively eliminate the axial clearance between the bearings when multiple sets of bearings are matched, and improve the axial matching accuracy of the bearings.

[0014] 2. The combined bearing optimizes and reduces the thrust shaft rings between the bearings, reduces the number of bearing thrust shaft rings, and reduces the processing difficulty and cost of the bearings.

[0015] 3. The combination mode of the present invention is not limited to the combination of two sets of bearings, but is also applicable to the combination of more than two sets of bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cross-sectional view of the combined bearing of the utility model along its axial structure;

[0017] Figure 2 for Figure 1 Axial structural cross-section of the middle thrust shaft ring;

[0018] Figure 3 for Figure 1 Axial structural section view of the inner ring of the needle roller;

[0019] Figure 4 for Figure 1 Axial structural section view of the outer ring of the needle roller bearing;

[0020] Figure 5 for Figure 1 Axial structural cross-sectional view of the thrust roller assembly;

[0021] Figure 6 for Figure 1 Axial structural cross-section of the centrifugal needle roller assembly.

[0022] Figure numerals: 100, combined bearing; 1, thrust shaft ring; 2, needle roller inner ring; 3, needle roller bearing outer ring; 31, needle roller raceway; 4, thrust roller assembly; 41, roller retainer; 42, thrust roller; 5, radial needle roller assembly; 51, needle roller retainer; 52, radial needle roller. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following Figures 1 to 6 The technical solutions of the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field are within the scope of protection of the present invention.

[0024] like Figures 1 to 6 As shown, the present invention discloses a high-precision needle roller and thrust roller combination bearing. The combination bearing 100 comprises at least three thrust collars 1, two needle roller inner rings 2, and two needle roller bearing outer rings 3. The thrust collars 1 and needle roller inner rings 2 are spaced and aligned with each other. The inner diameter of the thrust collar 1 is slightly larger than that of the needle roller inner ring 2 by 0.05 to 0.1 mm, facilitating installation of the thrust collar 1. The outer diameter of the needle roller inner ring 2 is smaller than that of the thrust collar 1, and the width of the needle roller inner ring 2 is greater than that of the needle roller bearing outer ring 3. An installation raceway is formed between adjacent thrust collars 1 and needle roller bearing outer rings 3, outside the needle roller inner ring 2. A thrust roller assembly 4 is mounted within the outer raceway of the needle roller inner ring 2. A needle roller raceway 31 is defined on the inner wall of the needle roller bearing outer ring 3, and a radial needle roller assembly 5 is mounted within the outer periphery of the needle roller inner ring 2, within the raceway 31. The corresponding needle roller bearing outer ring 3, needle roller inner ring 2, and radial needle roller assembly 5 form a radial needle roller bearing 52, which is used to carry the bearing's radial load. The corresponding thrust shaft ring 1, thrust roller assembly 4, and needle roller bearing outer ring 3 form a thrust bearing, which is used to carry the bearing's axial load. The radial needle roller bearing 52 and the thrust bearing are stacked together to form a complete set of high-precision needle roller and thrust roller combination bearings. The components of the combined bearing have been specially designed and matched to ensure that when stacked together, there is a certain amount of axial clearance when there is no axial load. However, when the combined bearing is subjected to a certain axial preload, the elastic deformation of the bearing components under axial load can reduce the overall axial clearance of the bearing to zero.

[0025] This new design replaces the traditional stacking and assembly of multiple bearings with a single combined bearing set, effectively eliminating the axial clearance between the bearings when multiple sets are assembled, improving the axial fit accuracy of the bearings. This combined bearing optimizes and reduces the number of thrust washers (1) between the bearings, thereby reducing the difficulty and cost of bearing manufacturing.

[0026] like Figure 5 As shown, the radial needle roller assembly 5 includes a needle roller cage 51 correspondingly clamped between the needle roller bearing outer ring 3 and the needle roller inner ring 2. The needle roller cage 51 is circumferentially provided with a plurality of radial needle rollers 52 accommodated in the needle roller raceway 31.

[0027] like Figure 6 As shown, the thrust roller assembly 4 includes a roller cage 41 that is correspondingly mounted on the outside of the needle roller inner ring 2 and located in the mounting raceway. The roller cage 41 is circumferentially provided with multiple thrust rollers 42, and the two ends of the thrust roller 42 respectively abut against the side walls of the thrust shaft ring 1 and the needle roller bearing outer ring 3.

[0028] The combination mode of the present invention is not limited to the combination of two sets of bearings, but is also applicable to the combination of more than two sets of bearings.

[0029] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A high-precision needle roller and thrust roller combined bearing, characterized in that: The combined bearing (100) comprises at least three thrust shaft rings (1), two needle roller inner rings (2) and two needle roller bearing outer rings (3), wherein the thrust shaft rings (1) and the needle roller inner rings (2) are arranged in a spaced and fitted manner; The outer diameter of the needle roller inner ring (2) is smaller than the outer diameter of the thrust shaft ring (1), and the width of the needle roller inner ring (2) is larger than the width of the needle roller bearing outer ring (3); a mounting raceway is formed between the adjacent thrust shaft ring (1) and the needle roller bearing outer ring (3) on the outer side of the needle roller inner ring (2), and a thrust roller assembly (4) is correspondingly mounted in the outer peripheral mounting raceway of the needle roller inner ring (2); The inner wall of the needle roller bearing outer ring (3) is provided with a needle roller track (31), and the outer periphery of the needle roller inner ring (2) is located in the needle roller track (31) and is correspondingly provided with a centripetal needle roller assembly (5).

2. The high-precision needle roller and thrust roller combined bearing according to claim 1, characterized in that: The corresponding needle roller bearing outer ring (3), needle roller inner ring (2) and radial needle roller assembly (5) form a radial needle roller (52) bearing for carrying the radial load of the bearing.

3. The high-precision needle roller and thrust roller combined bearing according to claim 2, characterized in that: The centripetal needle roller assembly (5) comprises a needle roller retainer (51) correspondingly mounted between the needle roller bearing outer ring (3) and the needle roller inner ring (2), and the needle roller retainer (51) is circumferentially provided with a plurality of centripetal needle rollers (52) accommodated in the needle roller raceway (31).

4. The high-precision needle roller and thrust roller combination bearing according to any one of claims 1 to 3, characterized in that: The corresponding thrust shaft ring (1), thrust roller assembly (4) and needle roller bearing outer ring (3) form a thrust bearing for carrying the axial load of the bearing.

5. The high-precision needle roller and thrust roller combined bearing according to claim 4, characterized in that: The thrust roller assembly (4) includes a roller retainer (41) which is correspondingly sleeved on the outside of the needle roller inner ring (2) and located in the mounting raceway. The roller retainer (41) is provided with a plurality of thrust rollers (42) in the circumferential direction. The two ends of the thrust rollers (42) respectively contact the side walls of the thrust shaft ring (1) and the needle roller bearing outer ring (3).

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