CN110966300A

CN110966300A - Rolling bearing and assembling method thereof

Info

Publication number: CN110966300A
Application number: CN201911247732.XA
Authority: CN
Inventors: 陈锋; 李敬洋
Original assignee: Ningbo Shilong Bearing Co ltd
Current assignee: Ningbo Shilong Bearing Co ltd
Priority date: 2019-12-09
Filing date: 2019-12-09
Publication date: 2020-04-07

Abstract

Providing a rolling bearing and an assembly method thereof, wherein balls (3) are uniformly arranged in an annular space between an outer ring (1) and an inner ring (2) of the bearing at intervals, an elastic supporting piece is arranged between adjacent balls (3), and two ends of the elastic supporting piece always respectively support the balls (3); the difference between the inner radius (R1) of the outer ring (1) and the outer radius (R2) of the inner ring (2) is smaller than the diameter of the balls (3), the inner surface of the outer ring (1) and the outer surface of the inner ring (2) are respectively provided with an arc groove (4) to form an annular roller path for the balls (3) to roll, and the outer ring (1) and the inner ring (2) are respectively used as an outer ring retainer ring (6) and an inner ring retainer ring (7) for blocking the balls (3) at two sides of the arc groove (4); during assembly, the outer ring (1) and the inner ring (2) are in eccentric positions, and balls (3) are arranged in a wider space to reach an annular raceway; the rolling bearing has the advantages of low noise, simple structure, stable work and long service life.

Description

Rolling bearing and assembling method thereof

Technical Field

The invention relates to a rolling bearing and an assembly method thereof, in particular to a rolling bearing adopting a novel ball bearing structure to replace a traditional retainer and an assembly method thereof.

Background

The rolling bearing is used as a basic standard component of modern industrial machines, has wide application and is greatly required. A rolling bearing is a precise mechanical element that reduces friction loss by changing sliding friction between a running shaft and a shaft seat into rolling friction. The traditional rolling bearing generally comprises four parts, namely an inner ring, an outer ring, a rolling body and a retainer, wherein the inner ring is used for being matched with a shaft and rotating together with the shaft; the outer ring is matched with the bearing seat to play a supporting role; the rolling bodies are core elements of the rolling bearing, the rolling bodies are uniformly distributed in an annular space between the inner ring and the outer ring by virtue of the retainer, the sliding friction between the running shaft and the shaft seat is changed into the rolling friction between the rolling friction and the inner ring and the outer ring, and the service performance and the service life of the rolling bearing are directly influenced by the shape, the size, the material and the number of the rolling bodies; the retainer supports the rolling bodies and uniformly separates the rolling bodies, so that collision and friction among the rolling bodies are avoided. In addition, the lubricant is also considered as the fifth major component of the rolling bearing, and mainly plays roles of lubrication, cooling, cleaning and the like. The bearing manufacturing technology is mature at present. For dust protection, both sides of the bearing are typically provided with dust caps. In order to install the dust cap, the bearing outer ring needs to be symmetrically grooved, and the groove is generally called a dust-proof groove in the industry because the groove is used for installing the dust cap. Compared with a sliding bearing, the rolling bearing has the advantages of small friction resistance, small power consumption, high mechanical efficiency and easy starting; the size is standardized, the interchangeability is realized, the installation and the disassembly are convenient, and the maintenance is convenient; the method is suitable for mass production and has high production efficiency; the structure is compact, the weight is light, and the axial size is more reduced; high precision, large load and the like. But also has the disadvantages of loud noise, complex structure of the bearing seat, failure due to fatigue of the rolling contact surface, and the like.

Since the cage serves to isolate the rolling bodies and generally also to guide and retain them within the bearing, it is currently more particularly shaped, generally in the form of a monolithic, annular irregular geometric body provided with a plurality of cavities in the circumferential direction for receiving the balls. In order for the balls to roll in the cavities, rolling gaps are reserved between the cavities and the balls. When the rolling bearing works, particularly when the load is complex and the rolling bearing rotates at high speed, frequent rigid collision can occur between the balls and the cavity wall of the retainer, the retainer is subjected to large centrifugal force, impact and vibration, large sliding friction exists between the retainer and the rolling body, and a large amount of heat is generated. The combined effect of force and heat can lead to cage failure, and in severe cases, can cause cage burn and fracture. Therefore, the material of the retainer is required to have good thermal conductivity, good wear resistance, small friction coefficient, smaller density, certain strength and toughness matching, better elasticity and rigidity, expansion coefficient similar to that of the rolling body and good processing property. In addition, the cage is subjected to chemical agents such as lubricants, lubricant additives, organic solvents, coolants, and the like. The manufacturing cost of the cage is relatively high, which directly drives up the manufacturing cost of the rolling bearing. In summary, the existing rolling bearing has the defects of high noise, complex structure of a bearing seat, failure caused by fatigue of a rolling contact surface and the like, and is mainly caused by the structures of a rolling body and a retainer.

Disclosure of Invention

The invention aims to solve the technical problems of providing a rolling bearing and an assembly method thereof, and particularly provides a rolling bearing which adopts a novel ball support structure to replace a traditional retainer and an assembly method thereof, so as to overcome the defects of high noise, complex structure of a bearing seat, failure caused by fatigue of a rolling contact surface and the like of the existing rolling bearing.

The technical scheme adopted by the invention for solving the technical problems is as follows:

a rolling bearing comprises an outer ring (1) and an inner ring (2), an annular space is formed between the outer ring (1) and the inner ring (2), and balls (3) are uniformly arranged in the annular space at intervals, and the rolling bearing is characterized in that an elastic support member is arranged between every two adjacent balls (3), and two ends of the elastic support member always respectively support the balls (3); the difference between the inner radius (R1) of the outer ring (1) and the outer radius (R2) of the inner ring (2) is smaller than the diameter of the balls (3), the circular arc grooves (4) matched with the balls (3) are respectively formed in the inner surface of the outer ring (1) and the outer surface of the inner ring (2), an annular roller path for rolling the balls (3) is formed between the circular arc grooves (4) of the outer ring (1) and the circular arc grooves (4) of the inner ring (2), and the outer ring (1) and the inner ring (2) respectively serve as an outer ring retainer ring (6) and an inner ring retainer ring (7) for blocking the balls (3) on two sides of the circular arc grooves (4), so that the balls (3) can only roll in the annular roller path after the rolling bearing is assembled.

The following are further schemes, respectively:

the elastic supporting piece is a compression spring (8).

The balls (3) are partially sunk in the ends of the compression springs (8).

The rolling bearing comprises 8 balls (3) and 8 compression springs (8).

And lubricating oil or lubricating grease is filled in the annular roller path.

And the two sides of the outer ring (1) and the inner ring (2) are respectively provided with an outer ring end groove (9) and an inner ring end groove (10), and dust covers are tightly attached to the outer ring end groove (9) and the inner ring end groove (10).

The assembling method of the rolling bearing is characterized in that when the balls (3) are arranged between the outer ring (1) and the inner ring (2), the outer ring (1) and the inner ring (2) are in eccentric positions, all the balls (3) are arranged at the positions with wider space between the outer ring (1) and the inner ring (2) to form an annular raceway, and then the elastic supporting pieces are arranged between the adjacent balls (3).

The elastic support piece is arranged between the adjacent balls to replace a retainer of the existing rolling bearing, and the elastic support piece always supports against the balls and can ensure the balls to roll smoothly. The inner surface of the outer ring and the outer surface of the inner ring are respectively provided with an arc groove matched with the balls, an annular roller path for the balls to roll is formed between the arc groove of the outer ring and the arc groove of the inner ring, and the outer ring and the inner ring are respectively used as an outer ring retainer ring and an inner ring retainer ring for blocking the balls at two sides of the arc groove, so that the balls can only roll in the annular roller path after the rolling bearing is assembled. The elastic support piece always supports the ball and can ensure the smooth rolling of the ball, the ball and the elastic support piece have no gap, the frequent rigid collision phenomenon between the ball of the existing rolling bearing and the cavity wall of the retainer is avoided, and the defects that the existing rolling bearing is large in noise caused by the structures of the rolling body and the retainer, the structure of a bearing seat is complex, the bearing seat can lose efficacy due to the fatigue of the rolling contact surface and the like are overcome. The rolling bearing has the advantages of low noise, simple structure, stable work and long service life.

Drawings

FIG. 1 is a perspective view of a rolling bearing according to the present invention;

FIG. 2 is a schematic front view of a rolling bearing according to the present invention;

FIG. 3 is a schematic diagram showing the positional relationship between the outer ring and the inner ring of the rolling bearing of the present invention;

FIG. 4 is a schematic view showing the relationship between the balls and the compression springs in the rolling bearing of the present invention;

FIG. 5 is a perspective view of the outer ring;

FIG. 6 is a schematic cross-sectional view of the outer ring;

FIG. 7 is a perspective view of the inner race;

FIG. 8 is a schematic side view of the inner race;

FIG. 9 is a schematic view showing a state where balls are loaded in a wide space between an outer ring and an inner ring of a rolling bearing according to the present invention at an eccentric position;

FIG. 10 is a schematic view showing the state of uniform distribution of balls after assembly;

fig. 11 is a perspective view of the rolling bearing of the present invention.

Detailed Description

The following describes a specific embodiment of the present invention, as shown in fig. 1 to 11.

A rolling bearing, as shown in FIG. 1, FIG. 2 or FIG. 11, comprises an outer ring 1 and an inner ring 2, an annular space is formed between the outer ring 1 and the inner ring 2, a plurality of balls 3 are uniformly arranged in the annular space at intervals, an elastic support is arranged between adjacent balls 3, the elastic support is preferably a compression spring 8 made of metal, and particularly preferably a compression spring 8 made of spring steel. Each ball 3 is equally interchangeable and each compression spring 8 is equally interchangeable. The balls 3 are arranged alternately with the compression springs 8, i.e. each ball 3 is located between 2 adjacent compression springs 8, i.e. each compression spring 8 is in turn located between 2 adjacent balls 3, the number of balls 3 is equal to the number of compression springs 8, and the average distance between 2 adjacent balls 3 is not larger than the diameter of the balls 3. The number of the balls 3 and the compression springs 8 is usually not less than 4, not more than 12; in particular, it may be preferred to arrange 8

identical balls

3 and 8 identical compression springs 8. The size of the ball 3 can be matched with the size of the outer ring 1 and the size of the inner ring 2 according to the prior art; the compression spring 8 must always have enough elasticity to always support the ball 3, the size of the compression spring 8 is suitable for the ball 3, the diameter of the spring 8 is smaller than that of the ball 3, particularly between 1/2 and 2/3 of the diameter of the ball 3, the length of the spring 8 can be similar to that of the ball 3, the length of the assembly in a compression state does not exceed the diameter of the ball 3, and the length in the compression state is suitable for 1/2 to 1 time of the diameter of the ball 3. As shown in fig. 1, 2 or 11, two ends of the elastic supporting member always respectively support against the ball 3; as shown in fig. 2 or 4, the balls 3 are partially sunk into the ends of the compression springs 8.

As shown in fig. 6 and 8, the difference between the inner radius R1 of the outer ring 1 and the outer radius R2 of the inner ring 2 is smaller than the diameter of the balls 3. As shown in fig. 5, 6, 7, 8 or 3, the inner surface of the outer ring 1 and the outer surface of the inner ring 2 are respectively provided with arc grooves 4 adapted to the balls 3, and the radius r of each arc groove 4 is not less than the radius of each ball 3; if the two are the same basic size, the radius r of the circular arc groove 4 adopts a positive tolerance, and the radius of the ball 3 adopts a negative tolerance. An annular roller path for rolling the balls 3 is formed between the arc groove 4 of the outer ring 1 and the arc groove 4 of the inner ring 2, and the outer ring 1 and the inner ring 2 are respectively used as an outer ring retainer ring 6 and an inner ring retainer ring 7 for blocking the balls 3 at two sides of the arc groove 4, so that the balls 3 can only roll in the annular roller path after the rolling bearing is assembled. Lubricating oil or lubricating grease is filled in the annular roller path. In addition, following the prior art, the two sides of the outer ring 1 and the inner ring 2 are respectively provided with an outer ring end groove 9 and an inner ring end groove 10, and dust covers are closely attached to the outer ring end groove 9 and the inner ring end groove 10.

According to the assembling method of the rolling bearing, when the balls 3 are arranged between the outer ring 1 and the inner ring 2, the outer ring 1 and the inner ring 2 are in eccentric positions, as shown in figure 9, all the balls 3 are arranged at a wider position between the outer ring 1 and the inner ring 2 to form an annular raceway, after all the balls 3 are arranged in the annular raceway, the outer ring 1 and the inner ring 2 are in a circle center coinciding position, as shown in figure 10, and then the elastic supporting pieces are arranged between the adjacent balls 3, so that the rolling bearing shown in figure 1, figure 2 or figure 11 is formed. In fig. 9 and 10, an icon 11 is a groove bottom arc line of the inner surface arc groove 4 of the outer ring 1, and an icon 12 is an inner surface arc line of the outer ring 1; the icon 13 is a groove bottom arc line of the outer surface arc groove 4 of the inner ring 2, and the icon 14 is an outer surface arc line of the inner ring 2.

Claims

1. A rolling bearing comprises an outer ring (1) and an inner ring (2), an annular space is formed between the outer ring (1) and the inner ring (2), and balls (3) are uniformly arranged in the annular space at intervals, and the rolling bearing is characterized in that an elastic support member is arranged between every two adjacent balls (3), and two ends of the elastic support member always respectively support the balls (3); the difference between the inner radius (R1) of the outer ring (1) and the outer radius (R2) of the inner ring (2) is smaller than the diameter of the balls (3), the circular arc grooves (4) matched with the balls (3) are respectively formed in the inner surface of the outer ring (1) and the outer surface of the inner ring (2), an annular roller path for rolling the balls (3) is formed between the circular arc grooves (4) of the outer ring (1) and the circular arc grooves (4) of the inner ring (2), and the outer ring (1) and the inner ring (2) respectively serve as an outer ring retainer ring (6) and an inner ring retainer ring (7) for blocking the balls (3) on two sides of the circular arc grooves (4), so that the balls (3) can only roll in the annular roller path after the rolling bearing is assembled.

2. Rolling bearing according to claim 1, characterized in that the elastic support is a compressed spring (8).

3. Rolling bearing according to claim 2, characterized in that the balls (3) are partially sunk in the ends of the compression springs (8).

4. Rolling bearing according to claim 2, characterized in that it comprises 8 balls (3) and 8 compression springs (8).

5. Rolling bearing according to claim 1, characterized in that the annular raceway is filled with lubricating oil or grease.

6. Rolling bearing according to claim 1, wherein the outer ring (1) and the inner ring (2) are provided with an outer ring end groove (9) and an inner ring end groove (10) on both sides, respectively, and a dust cap is mounted in close proximity to the outer ring end groove (9) and the inner ring end groove (10).

7. A method of assembling a rolling bearing according to any of claims 1 to 6, wherein when balls (3) are inserted between the outer ring (1) and the inner ring (2), the outer ring (1) and the inner ring (2) are eccentrically positioned, all the balls (3) are inserted into the annular raceway at a wide interval between the outer ring (1) and the inner ring (2), and then elastic supporting members are inserted between the adjacent balls (3).