An interference fit assembly device for bearing rolling elements

Abstract

A device for interference fit assembly of bearing rolling elements relates to the technical field of bearing rolling element assembly. The present invention solves the problems of the existing interference fit assembly method for bearing rolling elements, such as time-consuming and labor-intensive operation, inaccurate installation of rollers, and collision between rolling elements and raceways. The lower part of the hollow gear shaft of the present invention is sleeved with a tapered roller bearing, and the upper end of the hollow gear shaft is installed with a workbench. The upper surface of the workbench is processed in sequence from the outside to the inside in the circumferential direction with a first step plane, a second step plane, and a third step plane for respectively placing the bearing outer ring, the retaining frame, and the rolling element to be assembled. A stopper is provided on the outer side of the bearing outer ring, and a top block is provided above the inner hole of the workbench. The top block corresponds to the rolling element to be assembled. The upper end of the top block fixing seat is connected to the top block, and the lower end of the top block fixing seat passes through the workbench and the inner hole of the hollow gear shaft from top to bottom, and is fixed to the cylinder joint. The end of the cylinder piston rod is connected to the cylinder joint. The present invention is used to achieve interference fit assembly of bearing rolling elements.

Description

Technical Field

[0001] The invention relates to the technical field of bearing rolling element assembly, and in particular to an interference assembly device for a bearing rolling element. Background Art

[0002] Bearings are highly versatile, standardized, and fundamental components of precision machinery, widely used in machine tool spindles, aerospace engines, high-speed rail, and other precision, heavy-duty equipment. However, the retainer locking point size of some bearings is smaller than the maximum diameter of the rolling element, resulting in an interference fit. Assembly methods typically include hammering, hydraulic presses, and shrink-fitting, which are time-consuming and labor-intensive. Furthermore, roller installation is imprecise, and there is potential for collision between the rolling element and the raceway. Therefore, improvements are needed. Summary of the Invention

[0003] The purpose of the present invention is to solve the problems of the existing interference fit method for bearing rolling elements, such as time-consuming and labor-intensive operation, inaccurate installation of rollers, and collision between rolling elements and raceways, and to provide a bearing rolling element interference fit device.

[0004] The technical solution of the present invention is:

[0005] A bearing rolling element interference fit assembly device, which includes a mounting frame, a servo motor 11, a driving gear 12, a block 1, a bearing outer ring 2, a retaining frame 3, a top block 4, a cylinder joint 5, a cylinder 6, a top block fixing seat 7, a hollow gear shaft 8, a tapered roller bearing 9 and a workbench 10. The upper surface of the mounting frame is provided with an axial hole, the hollow gear shaft 8 is vertically inserted into the axial hole of the mounting frame, the lower part of the hollow gear shaft 8 is sleeved with a tapered roller bearing 9, the outer ring of the tapered roller bearing 9 is fixedly mounted on the upper surface of the mounting frame, the side of the cylindrical gear on the hollow gear shaft 8 is provided with a driving gear 12 meshing with it, the driving gear 12 is mounted on the rotor end of the servo motor 11, the servo motor 11 is mounted on the upper surface of the mounting frame, and the upper end of the hollow gear shaft 8 is mounted with a workbench 10. The workbench 10 is a hollow cylindrical structure. The upper surface of the workbench 10 is processed in sequence from the outside to the inside in the circumferential direction with a first step plane, a second step plane and a third step plane for placing the bearing outer ring 2, the retaining frame 3 and the rolling body to be assembled respectively. A stopper 1 is provided on the outside of the bearing outer ring 2. The bottom of the stopper 1 is installed on the upper surface of the mounting frame. A top block 4 is provided above the inner hole of the workbench 10. The top block 4 corresponds to the rolling body to be assembled. The upper end of the top block fixing seat 7 is connected to the top block 4. The lower end of the top block fixing seat 7 passes through the workbench 10 and the inner hole of the hollow gear shaft 8 from top to bottom, and is fixed to the cylinder joint 5. The cylinder 6 is horizontally arranged below the hollow gear shaft 8. The bottom of the cylinder body of the cylinder 6 is installed on the mounting frame, and the end of the piston rod of the cylinder 6 is connected to the cylinder joint 5.

[0006] Furthermore, the bearing outer ring 2 , the retaining frame 3 , the hollow gear shaft 8 , the tapered roller bearing 9 and the workbench 10 are coaxially arranged.

[0007] Furthermore, the bearing outer ring grooves, the cage pockets and the rolling elements to be assembled correspond one to one.

[0008] Furthermore, the diameter of the first cylindrical surface formed between the first stepped plane and the second stepped plane is equal to the inner diameter of the bearing outer ring 2 .

[0009] Furthermore, the diameter of the second cylindrical surface formed between the second step plane and the third step plane is equal to the inner diameter of the retaining frame 3 .

[0010] Furthermore, the lower surface of the top block 4 is a flat side surface processed into an arc-shaped groove that matches the outer circle of the rolling body. The lower surface of the top block 4 is flat, and the vertical distance between the upper surface of the workbench 10 and the mounting frame is smaller than the vertical distance between the lower surface of the top block 4 and the mounting frame.

[0011] Furthermore, the top block 4, the oil cylinder joint 5, the piston rod of the oil cylinder 6 and the top block fixing seat 7 are rigidly connected.

[0012] Furthermore, the end face of the stopper 1 close to the bearing outer ring 2 is processed into an arc surface, and the arc surface matches the outer diameter of the bearing outer ring 2.

[0013] Furthermore, the bottom of the stopper 1 is slidably connected to the upper surface of the mounting frame via a guide rail.

[0014] Compared with the prior art, the present invention has the following effects:

[0015] 1. The bearing rolling element interference assembly device of the present invention has a compact structure. The workbench 10 not only limits the bearing outer ring 2, the retainer 3 and the rolling elements to be assembled through the stepped plane, but also guides the rolling elements, making it easy to operate and more convenient.

[0016] 2. During rolling element assembly, the present invention's interference fit assembly device for bearing rolling elements utilizes the retracting and expanding action of the piston rod of oil cylinder 6 to drive horizontal movement of top block 4, providing sufficient thrust for the rolling elements and completing assembly. Simultaneously, a driving gear 12 mounted on the rotor of servo motor 11 rotates hollow gear shaft 8, ensuring that each rotation of hollow gear shaft 8 results in the assembly of a rolling element. This system saves time and effort, offers a high degree of automation, and is suitable for large-scale deployment.

[0017] 3. The bearing rolling element interference assembly device of the present invention realizes the automatic assembly of the bearing rolling elements, and the pressure control accuracy during the pressing of the rolling elements is 1N, the rolling element displacement accuracy is 0.05mm, the surface of the rolling elements is not damaged after interference assembly, and the bearing assembly effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the bearing rolling element interference assembly device of the present invention.

[0019] In the figure: 1-stopper; 2-bearing outer ring; 3-cage; 4-top block; 5-cylinder joint; 6-cylinder; 7-top block fixing seat; 8-hollow gear shaft; 9-tapered roller bearing; 10-workbench; 11-servo motor; 12-driving gear. DETAILED DESCRIPTION

[0020] Specific implementation method 1: Combination Figure 1 Describe this embodiment, this embodiment is a bearing rolling element interference assembly device, it includes a mounting frame, a servo motor 11, a driving gear 12, a block 1, a bearing outer ring 2, a retaining frame 3, a top block 4, a cylinder joint 5, a cylinder 6, a top block fixing seat 7, a hollow gear shaft 8, a tapered roller bearing 9 and a workbench 10, an axial hole is opened on the upper surface of the mounting frame, the hollow gear shaft 8 is vertically inserted into the axial hole of the mounting frame, the lower part of the hollow gear shaft 8 is sleeved with a tapered roller bearing 9, the outer ring of the tapered roller bearing 9 is fixedly mounted on the upper surface of the mounting frame, the cylindrical gear side of the hollow gear shaft 8 is provided with a driving gear 12 meshing with it, the driving gear 12 is mounted on the rotor end of the servo motor 11, the servo motor 11 is mounted on the upper surface of the mounting frame, and the upper end of the hollow gear shaft 8 is mounted A workbench 10 is installed, and the workbench 10 is a hollow cylindrical structure. The upper surface of the workbench 10 is processed in sequence from the outside to the inside in the circumferential direction with a first step plane, a second step plane and a third step plane for placing the bearing outer ring 2, the retaining frame 3 and the rolling body to be assembled respectively. A stop block 1 is provided on the outside of the bearing outer ring 2, and the bottom of the stop block 1 is installed on the upper surface of the mounting frame. A top block 4 is provided above the inner hole of the workbench 10, and the top block 4 corresponds to the rolling body to be assembled. The upper end of the top block fixing seat 7 is connected to the top block 4, and the lower end of the top block fixing seat 7 passes through the workbench 10 and the inner hole of the hollow gear shaft 8 from top to bottom, and is fixed to the cylinder joint 5. The cylinder 6 is horizontally arranged below the hollow gear shaft 8, and the bottom of the cylinder body of the cylinder 6 is installed on the mounting frame, and the end of the piston rod of the cylinder 6 is connected to the cylinder joint 5.

[0021] Specific implementation method 2: Combination Figure 1 In this embodiment, the bearing outer ring 2, retainer 3, hollow gear shaft 8, tapered roller bearing 9, and worktable 10 are coaxially arranged. The first, second, and third stepped surfaces on worktable 10 are used to constrain the bearing outer ring 2, retainer 3, and rolling elements to be assembled, ensuring that the rolling elements and the assembly position are aligned. Other components and connections are identical to those in the first embodiment.

[0022] In this embodiment, the hollow gear shaft 8 can be configured with parameters according to the number of rolling elements to be assembled, so that the driving gear 12 on the rotor of the servo motor 11 drives the hollow gear shaft 8 to assemble a rolling element each time it rotates by an angle.

[0023] In this embodiment, the size of the workbench 10 is changed according to the specific sizes of the bearing outer ring 2, the retainer 3 and the rolling elements.

[0024] In this embodiment, the tapered roller bearing 9 can be adjusted according to the rotation situation so that the hollow gear shaft 8 is in the center position, which is convenient for assembly.

[0025] Specific implementation method three: Combination Figure 1 This embodiment describes a one-to-one correspondence between the bearing outer ring groove, cage pocket, and rolling element to be assembled. This arrangement ensures that the rolling element to be assembled can be accurately installed in the cage pocket and bearing outer ring groove under the push of the push block 4. The remaining components and connection relationships are the same as those in Specific Embodiments 1 or 2.

[0026] Specific implementation method four: Combination Figure 1 To explain this embodiment, the diameter of the first cylindrical surface formed between the first and second stepped planes is equal to the inner diameter of the bearing outer ring 2. This arrangement allows the inner and outer diameters of the bearing outer ring 2 to be radially positioned by the first cylindrical surface and stopper 1, respectively. The remaining components and connections are identical to those in Specific Embodiments 1, 2, or 3.

[0027] Specific implementation method five: Combination Figure 1 In this embodiment, the diameter of the second cylindrical surface formed between the second and third stepped planes is equal to the inner diameter of retainer 3. This arrangement allows the inner and outer diameters of retainer 3 to be radially aligned with the second cylindrical surface and bearing outer ring 2. The remaining components and connections are identical to those in Specific Embodiments 1, 2, 3, or 4.

[0028] Specific implementation method six: combination Figure 1 To explain this embodiment, the lower surface of top block 4 is flat, with a circular arc-shaped groove machined into the side surface to match the outer circumference of the rolling element. The lower surface of top block 4 is flat, and the vertical distance between the upper surface of workbench 10 and the mounting bracket is smaller than the vertical distance between the lower surface of top block 4 and the mounting bracket. This arrangement prevents interference between top block 4 and workbench 10. The remaining components and connections are identical to those of Specific Embodiments 1, 2, 3, 4, or 5.

[0029] Specific implementation method seven: combination Figure 1 To explain this embodiment, the top block 4, cylinder joint 5, piston rod of cylinder 6, and top block fixing base 7 are rigidly connected. This arrangement allows the top block 4, cylinder joint 5, piston rod of cylinder 6, and top block fixing base 7 to form a single unit, allowing the overall structure to move stably during the extension and retraction of the piston rod of cylinder 6. The remaining components and connections are identical to those in Specific Embodiments 1, 2, 3, 4, 5, or 6.

[0030] Specific implementation method eight: combination Figure 1 To explain this embodiment, the end surface of the stopper 1, located near the bearing outer ring 2, is machined into a circular arc surface that matches the outer diameter of the bearing outer ring 2. With this arrangement, the dimensions of the stopper 1 and the top block 4 vary depending on the specific dimensions of the bearing outer ring 2, the retainer 3, and the rolling elements. The remaining components and connections are identical to those of Embodiments 1, 2, 3, 4, 5, 6, or 7.

[0031] Specific implementation method nine: Combination Figure 1 To describe this embodiment, the bottom of the stopper 1 is slidably connected to the upper surface of the mounting frame via a guide rail. This arrangement places the stopper 1 at a distance from the bearing outer ring 2, limiting the displacement of the entire device. The remaining components and connections are identical to those in Embodiments 1, 2, 3, 4, 5, 6, 7, or 8.

[0032] How it works

[0033] Combine Figure 1 The operating principle of the present invention's interference fit assembly device for bearing rolling elements is explained below: Before assembling the rolling elements, the servo motor 11 and the oil cylinder 6 are first connected to an external control system via wires. During assembly, the piston rod of the oil cylinder 6 retracts and retracts, driving the ejector block 4 horizontally, pushing the rolling element into the retainer pocket and the bearing outer ring groove. Once each rolling element is assembled, the servo motor 11 is activated, and the driving gear 12 mounted on the servo motor's rotor rotates the hollow gear shaft 8. Each rotation of the hollow gear shaft 8 corresponds to the assembly of a rolling element, until all rolling elements are assembled.

[0034] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A bearing rolling element interference fit device, characterized in that: It comprises a mounting frame, a servo motor (11), a driving gear (12), a stopper (1), a bearing outer ring (2), a retaining frame (3), a top block (4), an oil cylinder joint (5), an oil cylinder (6), a top block fixing seat (7), a hollow gear shaft (8), a tapered roller bearing (9) and a workbench (10). An axial hole is provided on the upper surface of the mounting frame. The hollow gear shaft (8) is vertically inserted into the axial hole of the mounting frame. The lower part of the hollow gear shaft (8) is sleeved with a tapered roller bearing (9). The outer ring of the tapered roller bearing (9) is fixedly mounted on the upper surface of the mounting frame. A driving gear (12) meshing with the cylindrical gear on the side of the hollow gear shaft (8) is provided. The driving gear (12) is mounted on the rotor end of the servo motor (11). The servo motor (11) is mounted on the upper surface of the mounting frame. A workbench (10) is mounted on the upper end of the hollow gear shaft (8). The workbench ( 10) is a hollow cylindrical structure. The upper surface of the workbench (10) is processed with a first step plane, a second step plane and a third step plane in sequence from the outside to the inside along the circumferential direction for placing the bearing outer ring (2), the retaining frame (3) and the rolling body to be assembled respectively. A stopper (1) is provided on the outside of the bearing outer ring (2). The bottom of the stopper (1) is installed on the upper surface of the mounting frame. A top block (4) is provided above the inner hole of the workbench (10). The top block (4) corresponds to the rolling body to be assembled. The upper end of the top block fixing seat (7) is connected to the top block (4). The lower end of the top block fixing seat (7) passes through the workbench (10) and the inner hole of the hollow gear shaft (8) from top to bottom, and is fixed to the cylinder joint (5). The cylinder (6) is horizontally arranged below the hollow gear shaft (8). The bottom of the cylinder body of the cylinder (6) is installed on the mounting frame. The end of the piston rod of the cylinder (6) is connected to the cylinder joint (5).

2. The bearing rolling element interference fit device according to claim 1, characterized in that: The bearing outer ring (2), the retaining frame (3), the hollow gear shaft (8), the tapered roller bearing (9) and the workbench (10) are coaxially arranged.

3. The bearing rolling element interference fit device according to claim 1 or 2, characterized in that: The bearing outer ring groove, cage pocket and rolling element to be assembled correspond one to one.

4. The bearing rolling element interference fit device according to claim 3, characterized in that: The diameter of the first cylindrical surface formed between the first step plane and the second step plane is equal to the inner diameter of the bearing outer ring (2).

5. The bearing rolling element interference fit device according to claim 4, characterized in that: The diameter of the second cylindrical surface formed between the second step plane and the third step plane is equal to the inner diameter of the retaining frame (3).

6. The bearing rolling element interference fit device according to claim 1 or 5, characterized in that: The lower surface of the top block (4) is a plane whose side surface is processed into an arc-shaped groove matching the outer circle of the rolling body. The lower surface of the top block (4) is a plane, and the vertical distance between the upper surface of the workbench (10) and the mounting frame is smaller than the vertical distance between the lower surface of the top block (4) and the mounting frame.

7. The bearing rolling element interference fit device according to claim 6, characterized in that: The top block (4), the oil cylinder joint (5), the piston rod of the oil cylinder (6) and the top block fixing seat (7) are rigidly connected.

8. The bearing rolling element interference fit device according to claim 1 or 7, characterized in that: The end face of the stopper (1) on one side close to the bearing outer ring (2) is processed into an arc surface, and the arc surface matches the outer diameter of the bearing outer ring (2).

9. The bearing rolling element interference fit device according to claim 8, characterized in that: The bottom of the stopper (1) is slidably connected to the upper surface of the mounting frame via a guide rail.

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