Multi-row roller bearing

Abstract

The utility model discloses a multi-row roller bearing, which comprises an outer ring, a first inner ring and a second inner ring, a first axial roller is arranged between the first inner ring and the side wall of the outer ring, a second axial roller is arranged between the second inner ring and the side wall of the outer ring, an outer ring raceway is formed on the inner circumferential wall of the outer ring, and the outer ring raceway is arranged on the outer circumferential wall of the outer ring. An outer ring raceway is formed on the outer circumferential wall of the first inner ring, an inner ring raceway is formed on the outer circumferential wall of the first inner ring, a radial roller is arranged between the outer ring raceway and the inner ring raceway, the contact surface of the outer ring raceway and the radial roller and the contact surface of the inner ring raceway and the radial roller are arc-shaped surfaces, and the outer circumferential surface of the radial roller is arc-shaped. The self-aligning bearing is simple in structure, has self-aligning performance, and can effectively reduce the influence caused by inclination, ensure the operation stability of the bearing and prolong the service life.

Description

Technical Field

[0001] The utility model relates to a multi-row roller bearing. Background Art

[0002] Multi-row roller bearings are usually large-diameter bearings, and are generally used in wind turbine main shafts, variable pitch systems, tunneling machines, etc. Since such bearings generally bear large overturning moments, axial forces, and radial forces, the bearings are generally provided with more than two rows of bidirectional axial rollers to bear overturning moments and radial forces, and more than one row of radial rollers to bear radial forces.

[0003] Generally, this type of bearing has a small axial clearance. However, under large axial forces and overturning moments, some axial rollers may not transmit loads. This will increase the vibration of the bearing during continuous rotation. When the bearing is subjected to overturning moments, a certain tilt angle will be generated between the bearing rings. The tilt angle will cause a large edge stress concentration on the radial rollers, leading to spalling failure and shortening the bearing life. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a multi-row roller bearing, which has a simple structure and self-aligning performance, can effectively reduce the impact of tilting, ensure the operating stability of the bearing, and extend the service life.

[0005] To achieve the above-mentioned purpose, the utility model provides a multi-row roller bearing, including an outer ring, a first inner ring and a second inner ring, a first axial roller is arranged between the first inner ring and the side wall of the outer ring, a second axial roller is arranged between the second inner ring and the side wall of the outer ring, an outer ring raceway is formed on the inner circumferential wall of the outer ring, an inner ring raceway is formed on the outer circumferential wall of the first inner ring, radial rollers are arranged between the outer ring raceway and the inner ring raceway, the contact surface between the outer ring raceway and the radial roller and the contact surface between the inner ring raceway and the radial roller are both arcuate surfaces, and the outer circumferential surface of the radial roller is arranged in an arc shape.

[0006] The beneficial effect of such an arrangement is that the radial rollers and raceways are arranged as spherical surfaces so as to have certain self-aligning properties to reduce the influence of tilting. Through the spherical surface design, after the outer ring is tilted at a certain angle, the contact surface size between the inner ring raceway surface and the outer ring raceway surface remains basically unchanged, which effectively improves the bearing capacity of the inner ring raceway and the outer ring raceway under torque conditions. In addition, the structure is simple and has good use effect.

[0007] As a further configuration of the present invention, the distance from the center point of the inner ring raceway to the center line of the bearing is set to d, and the radius of the arcuate surface of the inner ring raceway is set to R1, where R1=d.

[0008] The beneficial effect of such arrangement is that such arrangement makes the fit more tight and reliable, ensures the contact effect, improves the bearing capacity of the inner ring raceway under torque conditions, and has a good use effect.

[0009] As a further configuration of the present invention, the radius of the outer peripheral surface of the radial roller is set to R2, 0.96R1≤R2≤0.99R1.

[0010] The beneficial effect of such arrangement is that such arrangement makes the fit more tight and reliable, ensures the contact effect, improves the load-bearing capacity of the radial roller under torque conditions, and has a good use effect.

[0011] As a further configuration of the utility model, the radius of the arcuate surface of the outer ring raceway is R3, 1.02R2≤R3≤1.05R2.

[0012] The beneficial effect of such arrangement is that such arrangement makes the fit more tight and reliable, ensures the contact effect, improves the load-bearing capacity of the outer ring raceway under torque conditions, and has a good use effect.

[0013] As a further configuration of the utility model, a gasket is arranged between the first inner ring and the second inner ring, a first positioning groove is arranged on the inner circumferential wall of the first inner ring close to the gasket, and a second positioning groove is arranged on the inner circumferential wall of the second inner ring close to the gasket, the gasket has connecting flanges extending toward the first positioning groove and the second positioning groove, and the connecting flanges are provided with fastening bolts for fastening the connection.

[0014] The beneficial effect of such arrangement is that, with such arrangement, the washer can be used to keep the bearing in an axial preloaded state, ensuring that the rollers of the bearing are always loaded during operation, and the connection between the two inner rings is achieved through the washer structure, which makes it easier to install the overall structure, and the axial preload can be accurately configured by controlling the thickness of the washer. During assembly, the outer ring, the first axial roller and the first inner ring are first assembled in place, and then the axial distance a from the raceway surface between the outer ring and the second inner ring to the contact surface between the inner ring and the washer is measured, and finally the diameter b of the second axial roller and the washer thickness t=a+b-pf (preload amount) are measured. After the washer height is processed, the bearing is assembled as a whole, and finally the inner ring and the washer are connected together with bolts. This is simple to operate and makes the overall structure more reliable.

[0015] As a further configuration of the utility model, a positioning step is formed on the outer peripheral surface of the first inner ring, and the radial roller clearance is fitted between the positioning step and the gasket.

[0016] The beneficial effects of such arrangement are: such arrangement facilitates the positioning of the radial rollers, facilitates the assembly of the overall structure, improves the production and processing efficiency, and has a good use effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional structure diagram of an embodiment of the utility model;

[0018] Figure 2 Schematic diagram of radial rollers and raceways in an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the cross-sectional structure of the outer ring in the embodiment of the utility model. DETAILED DESCRIPTION

[0020] The implementation example of the multi-row roller bearing of the utility model is as follows: Figures 1 to 3 As shown: it includes an outer ring 1, a first inner ring 2 and a second inner ring 3, a first axial roller 21 is arranged between the first inner ring 2 and the side wall of the outer ring 1, a second axial roller 31 is arranged between the second inner ring 3 and the side wall of the outer ring 1, an outer ring raceway is formed on the inner circumferential wall of the outer ring 1, an inner ring raceway is formed on the outer circumferential wall of the first inner ring 2, a radial roller 4 is arranged between the outer ring raceway and the inner ring raceway, the contact surface between the outer ring raceway and the radial roller 4 and the contact surface between the inner ring raceway and the radial roller 4 are both arcuate surfaces, and the outer circumferential surface of the radial roller 4 is arranged in an arc shape. The beneficial effect of such arrangement is as follows: in such arrangement, the radial roller 4 and the raceway are arranged as spherical surfaces so as to have certain self-aligning performance to reduce the influence of tilting; through the spherical surface design, after the outer ring 1 is tilted at a certain angle, the contact surface size between the inner ring raceway surface and the outer ring 1 raceway surface remains basically unchanged, which effectively improves the bearing capacity of the inner ring raceway and the outer ring raceway under torque conditions; and the structure is simple and has good use effect.

[0021] As a further configuration of this embodiment, the distance from the center point of the inner ring raceway to the center line of the bearing is set to d, and the radius of the inner ring raceway arc surface is set to R1, R1 = d. The beneficial effect of this configuration is that the configuration makes the fit tighter and more reliable, ensures the contact effect, improves the bearing capacity of the inner ring raceway under torque conditions, and has a good use effect.

[0022] As a further configuration of this embodiment, the radius of the outer peripheral surface of the radial roller 4 is set to R2, R2 = 0.98R1. The beneficial effect of this configuration is that it makes the fit more tight and reliable, ensures the contact effect, improves the load-bearing capacity of the radial roller 4 under torque conditions, and has a good use effect.

[0023] As a further configuration of this embodiment, the radius of the arcuate surface of the outer ring raceway is R3, R3 = 1.03R2. The beneficial effect of this configuration is that it makes the fit more tight and reliable, ensures the contact effect, improves the bearing capacity of the outer ring raceway under torque conditions, and has a good use effect.

[0024] As a further configuration of the present embodiment, a gasket 5 is arranged between the first inner ring 2 and the second inner ring 3, a first positioning groove 22 is arranged on the inner circumferential wall of the first inner ring 2 close to the gasket 5, and a second positioning groove 32 is arranged on the inner circumferential wall of the second inner ring 3 close to the gasket 5, and the gasket 5 has a connecting flange 51 extending toward the first positioning groove 22 and the second positioning groove 32, and the connecting flange 51 is provided with fastening bolts for fastening the connection. The beneficial effect of such arrangement is as follows: with such arrangement, the bearing can be kept in an axial preloaded state by the washer 5, ensuring that the rollers of the bearing are always loaded during operation, and the connection between the two inner rings is realized by the washer 5 structure, which makes it easier to install the overall structure, and the axial preload can be accurately configured by controlling the thickness of the washer 5. During assembly, the outer ring 1, the first axial roller 21 and the first inner ring 2 are first assembled in place, and then the axial distance a from the raceway surface between the outer ring 1 and the second inner ring 3 to the contact surface between the inner ring and the washer 5 is measured, and finally the diameter b of the second axial roller 31 and the thickness of the washer 5 t=a+b-pf (preload amount) are measured, and after the height of the washer 5 is processed, the bearing is assembled as a whole, and finally the inner ring and the washer 5 are connected together with bolts, which is simple to operate and makes the reliability of the overall structure better.

[0025] As a further configuration of this embodiment, a positioning step is formed on the outer circumferential surface of the first inner ring 2, and the radial roller 4 is clearance-fitted between the positioning step and the washer 5. The beneficial effects of this configuration are: this configuration facilitates the positioning of the radial roller 4, facilitates the assembly of the overall structure, improves the production and processing efficiency, and has a good use effect.

[0026] The above example is only one preferred specific example of the present invention. The common changes and substitutions made by those skilled in the art within the technical solution of the present invention are all included in the protection scope of the present invention.

Claims

1. A multi-row roller bearing, comprising an outer ring, a first inner ring and a second inner ring, wherein a first axial roller is arranged between the first inner ring and the side wall of the outer ring, and a second axial roller is arranged between the second inner ring and the side wall of the outer ring, characterized in that: An outer ring raceway is formed on the inner circumferential wall of the outer ring, an inner ring raceway is formed on the outer circumferential wall of the first inner ring, radial rollers are arranged between the outer ring raceway and the inner ring raceway, the contact surface between the outer ring raceway and the radial roller and the contact surface between the inner ring raceway and the radial roller are both arc-shaped surfaces, and the outer circumferential surface of the radial roller is arranged in an arc shape.

2. The multi-row roller bearing according to claim 1, characterized in that: The distance from the center point of the inner ring raceway to the center line of the bearing is set to d, and the radius of the arcuate surface of the inner ring raceway is set to R1, R1=d.

3. The multi-row roller bearing according to claim 2, characterized in that: The radius of the outer peripheral surface of the radial roller is set to R2, 0.96R1≤R2≤0.99R1.

4. The multi-row roller bearing according to claim 3, characterized in that: The radius of the arcuate surface of the outer ring raceway is R3, 1.02R2≤R3≤1.05R2.

5. The multi-row roller bearing according to claim 1, characterized in that: A gasket is arranged between the first inner ring and the second inner ring, a first positioning groove is arranged on the inner circumferential wall of the first inner ring close to the gasket, a second positioning groove is arranged on the inner circumferential wall of the second inner ring close to the gasket, the gasket has connecting flanges extending toward the first positioning groove and the second positioning groove, and the connecting flanges are provided with fastening bolts for fastening the connection.

6. The multi-row roller bearing according to claim 5, characterized in that: A positioning step is formed on the outer peripheral surface of the first inner ring, and the radial roller clearance is fitted between the positioning step and the gasket.

Images