Double-shaft-ring four-point contact ball type turntable bearing

Abstract

The invention belongs to the technical field of turntable bearings, and particularly relates to a double-shaft-ring four-point contact ball type turntable bearing which comprises an outer tooth seat ring, a first shaft ring, a second shaft ring and two rows of steel balls, the first shaft ring and the second shaft ring are arranged on the inner side of the outer tooth seat ring, the first row of steel balls are arranged between the outer tooth seat ring and the first shaft ring, and the second row of steel balls are arranged between the outer tooth seat ring and the second shaft ring. The outer tooth seat ring and the first shaft ring are sealed through a first sealing assembly, a second row of steel balls are arranged between the outer tooth seat ring and the second shaft ring, and the outer tooth seat ring and the second shaft ring are sealed through a second sealing assembly. According to the double-shaft-ring four-point contact ball type turntable bearing, the same outer gear ring is provided with two shaft rings of different structures, a set of bearing is designed, and the double-shaft-ring four-point contact ball type turntable bearing is compact in structure, multifunctional and good in use.

Description

Technical Field

[0001] The invention belongs to the technical field of turntable bearings, and in particular relates to a double-shaft ring four-point contact ball turntable bearing. Background Art

[0002] Ball slewing bearings are used in automated assembly lines. In this working environment, the bearings rotate at high speeds, frequently change directions, and have complex transmission. Traditional single-row slewing bearings cannot perform their functions, so a double-row ball slewing bearing is needed to adapt to this complex working environment. Summary of the invention

[0003] In view of the defects of the above-mentioned prior art, the purpose of the present invention is to provide a double-shaft ring four-point contact ball turntable bearing, which is designed as a set of bearings by equipping the same outer gear seat ring with two shaft rings of different structures to meet the different functional characteristics of the bearings.

[0004] To achieve the above-mentioned purpose, the specific technical solution adopted by the present invention is: a double-shaft ring four-point contact ball slewing bearing, including an outer gear ring, a first shaft ring, a second shaft ring and two rows of steel balls, the first shaft ring and the second shaft ring are arranged on the inner side of the outer gear ring, a first row of steel balls is arranged between the outer gear ring and the first shaft ring, the outer gear ring and the first shaft ring are sealed by a first sealing assembly, a second row of steel balls is arranged between the outer gear ring and the second shaft ring, and the outer gear ring and the second shaft ring are sealed by a second sealing assembly.

[0005] Based on the above technical solution, it should be noted that the axial clearances of the first shaft ring and the second shaft ring are different.

[0006] Furthermore, the first shaft ring and the second shaft ring are arranged at intervals along the axial direction.

[0007] Furthermore, the first shaft ring and the second shaft ring are spaced apart by a distance of more than 30 mm.

[0008] Furthermore, the outer diameter surface of the outer gear race is entirely processed to form a toothed structure.

[0009] Furthermore, two adjacent steel balls in the first row of steel balls are isolated by an isolation block, and two adjacent steel balls in the second row of steel balls are isolated by an isolation block.

[0010] Further, the two end faces of the first shaft ring and the second shaft ring that are opposite to each other are inner end faces, and the two end faces of the first shaft ring and the second shaft ring that are opposite to each other are outer end faces. The first shaft ring and the second shaft ring are staggered with the outer gear seat ring in the axial position, and the outer end faces of the first shaft ring and the second shaft ring protrude from the end faces of both ends of the outer gear seat ring. The first sealing assembly includes a first outer sealing ring and a first inner sealing ring. The inner diameter of the first outer sealing ring is embedded in the outer diameter surface of the first shaft ring. The outer diameter of the first outer sealing ring is interference fit or contact fit with one end face of the outer gear seat ring. The outer diameter of the first inner sealing ring is embedded in the inner diameter surface of the outer gear seat ring, and the inner diameter of the first inner sealing ring is interference fit or contact fit with the inner end surface of the first shaft ring; the second sealing assembly includes a second outer sealing ring and a second inner sealing ring, the outer diameter of the second inner sealing ring is embedded in the inner diameter surface of the outer gear seat ring, and the inner diameter of the second inner sealing ring is interference fit or contact fit with the inner end surface of the second shaft ring, the inner diameter of the second outer sealing ring is embedded in the outer diameter surface of the second shaft ring, and the outer diameter of the second outer sealing ring is interference fit or contact fit with the other end surface of the outer gear seat ring.

[0011] Furthermore, an extension portion is formed on the inner diameter portion of the outer end surface of the first shaft ring, and a through first shaft ring assembly hole is provided on the extension portion, and a second shaft ring assembly hole is provided on the second shaft ring.

[0012] Furthermore, the axial clearances of the first shaft ring and the second shaft ring are different.

[0013] Furthermore, the axial clearance of the first shaft ring is 0-0.1 mm, and the axial clearance of the second shaft ring is 0.1-0.3 mm.

[0014] Furthermore, a first raceway and a second raceway are arranged on the cylindrical inner diameter surface of the outer gear raceway, a first shaft ring is arranged on the cylindrical outer diameter surface of the first shaft ring, a second shaft ring is arranged on the cylindrical outer diameter surface of the second shaft ring, the first row of steel balls is arranged between the first raceway and the first shaft ring, and the second row of steel balls is arranged between the second raceway and the second shaft ring.

[0015] Furthermore, the first row of steel balls and the second row of steel balls have the same size; the first seat ring raceway and the second seat ring raceway have the same processing size, and the first shaft ring raceway and the second shaft ring raceway have different processing sizes, so that the axial clearances of the first shaft ring and the second shaft ring are different.

[0016] The beneficial effects of the present invention are as follows: the double-shaft ring four-point contact ball turntable bearing of the present invention has two shaft rings with different structures on the same outer gear ring, which are designed as a set of bearings, have compact structure, multiple functions and are easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1It is a schematic diagram of the structure of a double-shaft ring four-point contact ball slewing bearing; Figure 2 It is a schematic diagram of a double-shaft ring four-point contact ball slewing bearing assembled in a coupling tightening machine; In the figure: 1. outer gear seat ring, 1.1 tooth structure, 2. first shaft ring, 2.1 first shaft ring assembly hole, 3. second shaft ring, 3.1 second shaft ring assembly hole, 4. first row of steel balls, 5. second row of steel balls, 6. isolation block, 7. first outer sealing ring, 8. first inner sealing ring, 9. second inner sealing ring, 10. second outer sealing ring. DETAILED DESCRIPTION

[0018] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific embodiments of the present invention are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present invention, so the present invention is not limited by the specific embodiments disclosed below.

[0019] See attached Figure 1 A double-shaft ring four-point contact ball slewing bearing comprises an outer gear ring 1, a first shaft ring 2, a second shaft ring 3 and two rows of steel balls, wherein the first shaft ring 2 and the second shaft ring 3 are arranged on the inner side of the outer gear ring 1, a first row of steel balls 4 is arranged between the outer gear ring 1 and the first shaft ring 2, the outer gear ring 1 and the first shaft ring 2 are sealed by a first sealing assembly, a second row of steel balls 5 is arranged between the outer gear ring 1 and the second shaft ring 3, and the outer gear ring 1 and the second shaft ring 3 are sealed by a second sealing assembly.

[0020] Furthermore, a first raceway and a second raceway are arranged on the cylindrical inner diameter surface of the outer gear race 1, a first raceway is arranged on the cylindrical outer diameter surface of the first shaft ring 2, a second shaft ring raceway is arranged on the cylindrical outer diameter surface of the second shaft ring 3, the first row of steel balls 4 is arranged between the first raceway and the first shaft ring raceway, and the second row of steel balls 5 is arranged between the second raceway and the second shaft ring raceway.

[0021] Furthermore, the axial clearances of the first shaft ring 2 and the second shaft ring 3 are different. Specifically, the first row of steel balls 4 and the second row of steel balls 5 are of the same size; the processing dimensions of the first raceway and the second raceway are the same, and the processing dimensions of the first shaft ring raceway and the second shaft ring raceway are different, so that the axial clearances of the first shaft ring 2 and the second shaft ring 3 are different. The axial clearance of the first shaft ring 2 is 0~0.1mm, and the axial clearance of the second shaft ring 3 is 0.1~0.3mm. The first shaft ring raceway and the second shaft ring raceway have different axial clearances to achieve different rotation characteristics and functions. A set of bearings realizes multiple functions, has a compact structure, and operates well.

[0022] Furthermore, the outer diameter surface of the outer gear race 1 is completely processed to form a toothed structure 1.1. Since the outer diameter gear of the race is relatively wide, a large torque can be transmitted.

[0023] Furthermore, two adjacent steel balls in the first row of steel balls 4 are isolated by an isolation block 6 , and two adjacent steel balls in the second row of steel balls 5 are isolated by an isolation block 6 .

[0024] Furthermore, the first shaft ring 2 and the second shaft ring 3 are spaced apart in the axial direction with a spacing distance of more than 30 mm, and the space formed in the middle can be used for the assembly and replacement of the first sealing assembly and the second sealing assembly. The two opposite end faces of the first shaft ring 2 and the second shaft ring 3 are the inner end faces, and the two opposite end faces of the first shaft ring 2 and the second shaft ring 3 are the outer end faces. The first shaft ring 2 and the second shaft ring 3 are staggered with the outer gear seat ring 1 in the axial position, and the outer end faces of the first shaft ring 2 and the second shaft ring 3 protrude from the end faces of the outer gear seat ring 1 at both ends; the first sealing assembly includes a first outer sealing ring 7 and a first inner sealing ring 8, the inner diameter of the first outer sealing ring 7 is embedded in the outer diameter surface of the first shaft ring 2, and the outer diameter of the first outer sealing ring 7 is interference fit or contact fit with one end face of the outer gear seat ring 1, and the first inner The outer diameter of the sealing ring 8 is embedded in the inner diameter surface of the outer gear seat ring 1, and the inner diameter of the first inner sealing ring 8 is interference fit or contact fit with the inner end surface of the first shaft ring 2; the second sealing assembly includes a second outer sealing ring 10 and a second inner sealing ring 9, the outer diameter of the second inner sealing ring 9 is embedded in the inner diameter surface of the outer gear seat ring 1, and the inner diameter of the second inner sealing ring 9 is interference fit or contact fit with the inner end surface of the second shaft ring 3, and the inner diameter of the second outer sealing ring 10 is embedded in the outer diameter surface of the second shaft ring 3, and the outer diameter of the second outer sealing ring 10 is interference fit or contact fit with the other end surface of the outer gear seat ring 1. The two rows of shaft rings are sealed separately to ensure the lubrication of the two rows of steel balls.

[0025] Furthermore, the first collar 2 is provided with an extension at the inner diameter portion of the outer end surface, and the extension is provided with a through first collar assembly hole 2.1, and the second collar 3 is provided with a second collar assembly hole 3.1. The first collar assembly hole 2.1 and the second collar assembly hole 3.1 are used to assemble external components.

[0026] For example, the double-shaft ring four-point contact ball slewing bearing of this embodiment is used as the main shaft bearing of the coupling tightening machine, see the attached Figure 2 , the bearing is assembled in A, the machine performs the function of tightening the sleeve coupling, the rotation speed is 30 rpm, and the rotation torque is 27116 Nm.

[0027] It should be noted that the parts not described in detail in the present invention are prior art.

[0028] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] The above examples are only the best embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments, and many variations are possible. All variations that can be directly derived or associated with the contents disclosed by a person skilled in the art should be considered as the protection scope of the present invention.

Claims

1. Double-shaft ring four-point contact ball slewing bearing, characterized by: It includes an outer gear seat ring, a first shaft ring, a second shaft ring and two rows of steel balls. The first shaft ring and the second shaft ring are arranged on the inner side of the outer gear seat ring, the first row of steel balls is arranged between the outer gear seat ring and the first shaft ring, and the outer gear seat ring and the first shaft ring are sealed by a first sealing assembly, the second row of steel balls is arranged between the outer gear seat ring and the second shaft ring, and the outer gear seat ring and the second shaft ring are sealed by a second sealing assembly.

2. The double-shaft ring four-point contact ball turntable bearing according to claim 1, characterized in that: The first shaft ring and the second shaft ring are spaced apart in the axial direction.

3. The double-shaft ring four-point contact ball turntable bearing according to claim 2, characterized in that: The first shaft ring and the second shaft ring are spaced apart by more than 30 mm in the axial direction.

4. The double-shaft ring four-point contact ball turntable bearing according to claim 1, characterized in that: The adjacent two steel balls in the first row of steel balls are isolated by an isolation block, and the adjacent two steel balls in the second row of steel balls are isolated by an isolation block; the outer diameter surface of the outer gear race is fully processed to form a toothed structure.

5. The double-shaft ring four-point contact ball turntable bearing according to claim 1, characterized in that: The two end faces of the first shaft ring and the second shaft ring that are opposite to each other are inner end faces, and the two end faces of the first shaft ring and the second shaft ring that are opposite to each other are outer end faces. The first shaft ring and the second shaft ring are staggered with the outer gear seat ring in the axial position, and the outer end faces of the first shaft ring and the second shaft ring protrude from the end faces of the outer gear seat ring at both ends; the first sealing assembly includes a first outer sealing ring and a first inner sealing ring, the inner diameter of the first outer sealing ring is embedded in the outer diameter surface of the first shaft ring, the outer diameter of the first outer sealing ring is interference fit or contact fit with one end face of the outer gear seat ring, and the first inner The outer diameter of the sealing ring is embedded in the inner diameter surface of the outer gear seat ring, and the inner diameter of the first inner sealing ring is interference fit or contact fit with the inner end surface of the first shaft ring; the second sealing assembly includes a second outer sealing ring and a second inner sealing ring, the outer diameter of the second inner sealing ring is embedded in the inner diameter surface of the outer gear seat ring, and the inner diameter of the second inner sealing ring is interference fit or contact fit with the inner end surface of the second shaft ring, the inner diameter of the second outer sealing ring is embedded in the outer diameter surface of the second shaft ring, and the outer diameter of the second outer sealing ring is interference fit or contact fit with the other end surface of the outer gear seat ring.

6. The double-shaft ring four-point contact ball turntable bearing according to claim 1, characterized in that: The first shaft ring is formed with an extension portion at the inner diameter portion of the outer end surface, and a through first shaft ring assembly hole is provided on the extension portion, and a second shaft ring assembly hole is provided on the second shaft ring.

7. The double-shaft ring four-point contact ball slewing bearing according to any one of claims 1 to 6, characterized in that: The first shaft ring and the second shaft ring have different axial clearances.

8. The double-shaft ring four-point contact ball turntable bearing according to claim 7, characterized in that: The axial clearance of the first shaft ring is 0-0.1 mm, and the axial clearance of the second shaft ring is 0.1-0.3 mm.

9. The double-shaft ring four-point contact ball turntable bearing according to claim 7, characterized in that: The first raceway and the second raceway are arranged on the cylindrical inner diameter surface of the outer gear raceway, the first shaft ring is arranged on the cylindrical outer diameter surface of the first shaft ring, the second shaft ring is arranged on the cylindrical outer diameter surface of the second shaft ring, the first row of steel balls is arranged between the first raceway and the first shaft ring, and the second row of steel balls is arranged between the second raceway and the second shaft ring.

10. The double-shaft ring four-point contact ball turntable bearing according to claim 9, characterized in that: The first row of steel balls and the second row of steel balls have the same size; the first raceway and the second raceway have the same processing size, and the first shaft ring raceway and the second shaft ring raceway have different processing sizes, so that the axial clearances of the first shaft ring and the second shaft ring are different.

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