Self-aligning roller bearing with three-row rolling element assembly

Abstract

The utility model discloses a kind of self-aligning roller bearings with three-row rolling element group structure, including bearing outer ring and bearing inner ring, three-row rolling element group is arranged between bearing inner ring and bearing outer ring, and rolling element group is made of several rolling elements, outer raceway is set up on the inner peripheral wall of bearing outer ring, inner raceway is set up on the outer peripheral wall of bearing inner ring corresponding to the position of each row of rolling elements, three retainers are arranged between bearing inner ring and bearing outer ring, three retainers and three-row rolling element group one-to-one correspondence, three inner raceways are all arranged in circular arc shape, outer raceway is arranged in spherical shape, and the arc center thereof is arranged at the center line position of bearing outer ring, three-row rolling element is divided into left column rolling element group, center rolling element group and right column rolling element group. The utility model solves the problem that traditional double-row self-aligning roller bearing cannot meet the demand of higher bearing capacity, lower friction torque and better impact resistance under the premise of not changing the size of appearance and retaining self-aligning ability.

Description

Technical Field

[0001] This utility model relates to the field of bearing technology, specifically to a self-aligning roller bearing with a three-row rolling element structure. Background Technology

[0002] Self-aligning roller bearings, as a key fundamental component in mechanical transmission systems, are widely used in metallurgy, mining, construction machinery, wind power, and many other fields. Their core function is to support rotating shafts, reduce kinetic friction, and compensate for concentricity errors caused by equipment installation deviations, shaft deformation under stress, and other factors, ensuring the stable operation of the mechanical system. Conventional self-aligning roller bearings generally employ a double-row rolling element structure design. This structure, through the cooperation of two rows of rolling elements and the inner and outer raceways, can effectively withstand radial loads and bidirectional axial loads, while also possessing a certain degree of self-aligning capability, meeting the basic usage requirements of traditional mechanical equipment.

[0003] However, with the rapid development of modern machinery industry, various equipment is evolving towards larger size, higher speed and heavier load, which puts forward more stringent requirements on the comprehensive performance of self-aligning roller bearings: on the one hand, the working conditions of equipment are becoming more and more complex, which puts forward higher standards for the bearing's load-bearing capacity (including radial and axial load limits) and impact resistance; on the other hand, in order to reduce energy consumption and improve transmission efficiency, lower requirements are also put forward for the control of bearing friction torque.

[0004] In practical applications, due to limitations in equipment installation space and structural design, the external dimensions of bearings are often strictly limited, making it impossible to improve performance by increasing the external dimensions. Furthermore, the internal space utilization of traditional double-row self-aligning roller bearings is already nearing its limit. Without changing the external dimensions and retaining the self-aligning capability, existing designs struggle to further improve load-bearing capacity, optimize friction torque, or meet the demands for high impact resistance under complex operating conditions, gradually becoming a technical bottleneck restricting the performance upgrade of related equipment. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a self-aligning roller bearing with a three-row rolling element structure. This solves the problem that traditional double-row self-aligning roller bearings, without changing their external dimensions and retaining their self-aligning capability, cannot meet the demands of the machinery industry for higher load-bearing capacity, lower frictional torque, and better impact resistance.

[0006] To achieve the above objectives, this utility model provides a self-aligning roller bearing with a three-row rolling element structure, including an outer ring and an inner ring. Three rows of rolling elements are arranged between the inner and outer rings, each row consisting of several rolling elements. An outer raceway is formed on the inner circumferential wall of the outer ring for the rolling elements in the three rows to roll. An inner raceway is formed on the outer circumferential wall of the inner ring corresponding to the position of each row of rolling elements. Three cages are arranged between the inner and outer rings, each cage corresponding to one of the three rows of rolling elements, with each rolling element in each row embedded in its corresponding cage. The three inner raceways are arc-shaped, and the outer raceway is spherical with its arc center located at the centerline of the outer ring. The three rows of rolling elements are divided into a left-row rolling element group, a center rolling element group, and a right-row rolling element group.

[0007] The advantages of adopting the above technical solution are as follows: The layout design of the three rows of rolling elements can make full use of the internal space between the inner and outer rings of the bearing, and with the corresponding cages, it can accurately guide and limit the rolling elements of each row, avoiding deviation or interference during the operation of the rolling elements; The spherical shape of the outer raceway, with its center coinciding with the center line of the outer ring of the bearing, can effectively compensate for the concentricity error caused by installation deviation and shaft deformation, ensuring the stable operation of the bearing's self-aligning function; The arc-shaped inner raceway of the bearing inner ring corresponding to each row of rolling elements can be precisely adapted to the shape of the rolling elements, increasing contact adaptability, reducing local stress concentration, and the three cages independently constrain each row of rolling elements, improving the synchronization and stability of the rolling element operation; The overall structural design of the above technology, without changing the external dimensions of the bearing, takes into account both self-aligning capability and load-bearing efficiency, enhances the reliability and stability of the bearing during operation, and is suitable for various complex mechanical transmission scenarios.

[0008] The present invention further provides that the contact angle between the rolling element in the central rolling element group and the corresponding inner raceway is 0 degrees, and the contact angle between the rolling element in the central rolling element group and the outer raceway is 0 degrees.

[0009] The advantages of adopting the above technical solution are: each rolling element in the central rolling element assembly maintains a 0-degree contact angle with both the inner and outer raceways, which maximizes the radial load-bearing capacity and ensures that the radial load is evenly transmitted to the contact surface between the rolling element and the raceway, reducing localized peak forces and preventing localized wear aggravation of the raceway. At the same time, the 0-degree contact angle design concentrates the force on the central rolling element more radially during operation, reducing the impact of axial force on operational stability. Combined with the spherical structure of the outer raceway, it ensures that the self-aligning function is not interfered with, while improving the bearing's adaptability to radial heavy-load conditions and reducing relative sliding between the rolling elements and the raceway.

[0010] The present invention further provides that: the contact angle between the rolling elements in the left and right rolling element groups and their respective inner raceways is 6-16 degrees, and the contact angle between the rolling elements in the left and right rolling element groups and their outer raceways is 6-16 degrees.

[0011] The advantages of adopting the above technical solution are as follows: The contact angle design between the rolling elements and the inner and outer raceways in the left and right rolling element groups can endow the bearing with bidirectional axial load-bearing capacity, enabling the bearing to effectively withstand axial loads in two directions and adapt to transmission scenarios with axial force fluctuations. At the same time, this contact angle design makes the contact area distribution between the rolling elements and the raceways more reasonable, reduces stress concentration under axial load, improves the balance of axial load-bearing capacity, complements the radial load-bearing efficiency of the central rolling element, and achieves a synergistic improvement in the radial and axial load-bearing capacity of the bearing. It also ensures the smoothness of the rolling elements during operation, reduces frictional loss under axial force, enhances the bearing's adaptability to complex load conditions, improves the stability and reliability of mechanical equipment during operation, and broadens the application range of the bearing.

[0012] The present invention further comprises: the radial cross-section of the outer diameter surface of the rolling element is arc-shaped, and the connection between the outer diameter surface of the rolling element and the side wall surface of the rolling element is arc-shaped and has rounded corners. The advantages of adopting the above technical solution are as follows: the radial cross-section of the outer diameter surface of the rolling element is arc-shaped, which can form a precise fit with the spherical outer raceway and the arc-shaped inner raceway, increasing the contact area while reducing local stress concentration and improving the uniformity of load transmission; the rounded corner design at the connection between the outer diameter surface of the rolling element and the side wall surface can avoid stress concentration during operation, prevent fatigue damage at the edge of the rolling element and the corresponding position of the raceway, protect the structural integrity of the rolling element and the raceway, reduce damage caused by wear and impact, improve the smoothness of the rolling element during operation, reduce frictional resistance, thereby extending the service life of the bearing, enhancing the structural stability and reliability of the bearing under high-frequency operation and complex working conditions, and ensuring the continuous and efficient operation of mechanical transmission.

[0013] The present invention further includes an arc-shaped retaining edge on the edge of the inner raceway corresponding to the left and right rolling element groups.

[0014] The advantages of adopting the above technical solution are: the arc-shaped retaining edge of the inner raceway corresponding to the left and right columns of rolling elements can accurately limit the rolling elements, prevent the rolling elements from axially shifting when the bearing is subjected to axial load or when the operation is bumpy, ensure the stability of the contact position between the rolling elements and the raceway, and reduce the problem of increased wear caused by contact deviation.

[0015] The present invention further comprises: the rolling element is made of bearing steel, the inner ring of the bearing is made of bearing steel, and the cage is made of copper.

[0016] The advantages of adopting the above technical solution are: the rolling elements and the inner ring of the bearing are made of bearing steel, which has excellent strength, hardness and wear resistance, and can withstand heavy loads and high-frequency friction, reducing wear and deformation caused by long-term operation, ensuring structural integrity and load-bearing capacity, and extending the service life of the bearing; the cage is made of copper, which has good lubricity and thermal conductivity, which can reduce the frictional resistance between the cage and the rolling elements, reduce frictional loss and heat generation during operation, and at the same time quickly conduct heat generated during operation, avoiding excessive local temperature that affects bearing performance. Attached Figure Description

[0017] Figure 1 This is a cross-sectional view of the present invention; Figure 2 This is a three-dimensional view of the three-row rolling element assembly in this utility model. Detailed Implementation

[0018] This utility model discloses a self-aligning roller bearing with a three-row rolling element group structure, including an outer ring 1 and an inner ring 2. Three rows of rolling elements are arranged between the inner ring 2 and the outer ring 1, each row consisting of several rolling elements 34. An outer raceway 11 is formed on the inner peripheral wall of the outer ring 1 for the rolling elements 34 in the three rows to roll. An inner raceway 21 is provided on the outer peripheral wall of the inner ring 2 corresponding to the position of each row of rolling elements 34. Three cages 3 are arranged between the inner ring 2 and the outer ring 1, each cage corresponding to one of the three rows of rolling elements, with each rolling element 34 in each row embedded in its corresponding cage 3. The three inner raceways 21 are all arc-shaped, and the outer raceway 11 is spherical with its arc center located at the centerline of the outer ring 1. The three rows of rolling elements are divided into a left row of rolling elements 31, a center row of rolling elements 32, and a right row of rolling elements 33. The contact angle between the rolling element 34 in the central rolling element group 32 and its corresponding inner raceway 21 is 0 degrees, and the contact angle between the rolling element 34 in the central rolling element group 32 and its outer raceway 11 is also 0 degrees. The contact angles between the rolling elements 34 in the left and right rolling element groups 31 and their respective inner raceways 21 range from 6 to 16 degrees. The contact angles between the rolling elements 34 in the left and right rolling element groups 31 and their respective outer raceways 11 are also 0 degrees. The angular range is 6-16 degrees. The radial cross-section of the outer diameter surface of the rolling element 34 is arc-shaped. The connection between the outer diameter surface of the rolling element 34 and the side wall surface of the rolling element 34 is arc-shaped and has a rounded corner 35. The edges of the inner raceways 21 corresponding to the left row of rolling element groups 31 and the right row of rolling element groups 33 are provided with arc-shaped retaining edges 211. The rolling element 34 is made of bearing steel. The inner ring 2 of the bearing is made of bearing steel. The cage 3 is made of copper.

[0019] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications may be made to this utility model without departing from its spirit and scope. All such changes and modifications fall within the scope of protection of this utility model as defined by the appended claims and their equivalents.

Claims

1. A self-aligning roller bearing with a three-row rolling element structure, comprising an outer ring and an inner ring, characterized in that: Three rows of rolling elements are arranged between the inner ring and the outer ring of the bearing. Each row of rolling elements consists of several rolling elements. The inner circumferential wall of the outer ring of the bearing has an outer raceway for the rolling elements in the three rows of rolling elements to roll. The outer circumferential wall of the inner ring of the bearing has an inner raceway corresponding to the position of each row of rolling elements. Three cages are arranged between the inner ring and the outer ring of the bearing. The three cages correspond one-to-one with the three rows of rolling elements, and the rolling elements in each row of rolling elements are embedded in the corresponding cage. The three inner raceways are all arc-shaped, and the outer raceway is spherical with its arc center located at the center line of the outer ring of the bearing. The three rows of rolling elements are divided into a left row of rolling elements, a center row of rolling elements, and a right row of rolling elements.

2. A self-aligning roller bearing with a three-row rolling element structure according to claim 1, characterized in that: The contact angle between the rolling element in the central rolling element group and the corresponding inner raceway is 0 degrees, and the contact angle between the rolling element in the central rolling element group and the outer raceway is 0 degrees.

3. A self-aligning roller bearing with a three-row rolling element group structure according to claim 1, characterized in that: The contact angle between the rolling elements in the left and right rolling element groups and their respective inner raceways is 6-16 degrees, and the contact angle between the rolling elements in the left and right rolling element groups and their outer raceways is 6-16 degrees.

4. A self-aligning roller bearing with a three-row rolling element structure according to claim 1, characterized in that: The radial cross-section of the outer diameter surface of the rolling element is arranged in an arc shape, and the connection between the outer diameter surface of the rolling element and the side wall surface of the rolling element is arc-shaped and has rounded corners.

5. A self-aligning roller bearing with a three-row rolling element structure according to claim 1, characterized in that: The edges of the inner raceways corresponding to the left and right rolling element groups are provided with arc-shaped retaining edges.

6. A self-aligning roller bearing with a three-row rolling element structure according to claim 1, characterized in that: The rolling element is made of bearing steel, the inner ring of the bearing is made of bearing steel, and the cage is made of copper.

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