Method for assembling an integrated double-row angular contact ball bearing

Abstract

This invention relates to an integrated double-row angular contact ball bearing assembly method, employing a fixture including a fixture base, a stop, and a process cage. The steps are as follows: 1. Clean the bearing inner ring, outer ring, formal cage, process cage, balls, and stop; 2. Clean the mounting platform and fixture base, and place the fixture base on the mounting platform; 3. Install the first inner ring onto the positioning boss of the fixture base, cover it with the process cage, and provide a stop at the top to support the second formal cage; install the outer ring, second formal cage, and balls, and remove the stop from the cutout in the base; 4. Clamp the two inner rings, remove the semi-finished product, and flip it so that the second inner ring with balls installed faces down, then reposition it on the fixture base; 5. Remove the first inner ring and process cage, install the first formal cage and stop, install the balls, press the first inner ring in place, and remove the stop to press the two inner rings together, completing the assembly. The finished bearing is then thoroughly cleaned. This invention does not introduce additional substances during assembly, improves assembly efficiency and accuracy, and reduces the difficulty of post-assembly cleaning.

Description

Technical Field

[0001] This invention belongs to the field of bearing assembly, and specifically relates to an assembly method for an integrated double-row angular contact ball bearing. Background Technology

[0002] The integrated double-row angular contact ball bearing 1 consists of one outer ring, two cages, two sets of balls, and two inner rings. (See attached image.) Figure 1 During assembly, the outer ring 1-3, the first formal cage 1-1, and the inner ring 1-2 of the first bearing are placed in their relative positions. Then, the second formal cage 1-5 is placed in, and a grease (such as butter) is applied to the ball holes of the second formal cage 1-5. Next, the balls 1-6 in the second layer are placed into the second formal cage (because the grease helps to hold the balls in place). Then, the inner ring 1-4 of the second bearing is placed into the second formal cage. The bearing is then rotated 180 degrees so that the inner ring of the first bearing faces upwards. The balls 1-7 in the first layer are then installed into the first formal cage in the same way as described above. Finally, the inner ring of the first bearing is placed in the bearing. After assembly, the bearing is thoroughly cleaned with gasoline.

[0003] The drawbacks of the existing assembly method are as follows: During cleaning, the bearing is placed entirely in gasoline, the two inner rings are tightened, and the outer ring is rotated, relying on the gasoline to flow into the bearing and clean away the grease. The clearance between the inner and outer rings is only 0.2mm, which is very small, resulting in poor cleaning effectiveness and leaving grease residue. For bearings with high precision requirements, residual impurities can affect the bearing's accuracy. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention proposes an assembly method for an integrated double-row angular contact ball bearing that does not introduce additional materials during assembly, improves assembly efficiency and accuracy, and reduces the difficulty of post-assembly cleaning.

[0005] The above-mentioned objective of this invention is achieved through the following technical solution: An assembly method for an integrated double-row angular contact ball bearing, wherein the tooling structure used in the assembly method includes a tooling base, a stop, and a process retainer; The upper end of the tooling base is provided with a circular support platform, and a positioning boss is provided at the center of the circular support platform. The outer diameter of the positioning boss matches the inner diameter of the bearing inner ring to achieve a clearance insertion fit between the bearing inner ring and the positioning boss. The middle part of the tooling base adopts a hollow structure, and a central hole is provided at the upper part of the tooling base. The central hole is connected to the hollow structure in the middle. The stop is made of flexible material and consists of a stop ring and a pull tab. The stop ring has an opening, and the pull tab is inverted L-shaped. The end of the upper horizontal edge of the pull tab is connected to the inner ring of the stop near the opening. The process retainer is a rigid sleeve, and its inner diameter, outer diameter, and height are consistent with those of the formal retainer. The assembly method includes the following steps: Step 1: Clean the inner bearing outer ring, main bearing cage, process cage, balls, and stop components of the bearing. Step 2: Clean and wipe the installation platform and tooling base clean, and then place the tooling base on the top of the installation platform; Step 3: Position and install the first bearing inner ring on the positioning boss of the tooling base; set a process retainer on the outside of the first bearing inner ring to support the second formal bearing retainer; set a stop at the upper end of the first bearing inner ring to support the second bearing inner ring; complete the installation of the bearing outer ring, the second formal bearing retainer, the balls inside the second formal bearing retainer and the second bearing inner ring, and after the installation is completed, pull out the stop from the cutout of the tooling base; Step 4: Clamp the two bearing inner rings of the half bearing product assembled in Step 3 by hand, remove it from the tooling base, then flip it over, place the second bearing inner ring with the balls installed facing down on the upper surface of the working base, and use the positioning boss at the upper end to position the second bearing inner ring. Step 5: First, remove the first bearing inner ring and process cage, then install the first formal cage and stop, completing the installation of the balls in the first formal cage. After the balls are installed, press the first bearing inner ring and remove the stop to press the first bearing inner ring and the second bearing inner ring together, completing the bearing assembly. After the bearing is assembled, clean the entire assembly.

[0006] Furthermore, the outer diameter of the circular support platform is smaller than the outer diameter of the bearing inner ring; the tooling base is composed of a top cylindrical platform, a top plate, three support columns, and a bottom plate arranged sequentially from top to bottom; the top surface of the top cylindrical platform forms the circular support platform, the three support columns are arranged circumferentially, the three support columns are connected between the top plate and the bottom plate, and a hollow space is formed between the three support columns.

[0007] Moreover, the stop is made of soft rubber with a hardness of 20A.

[0008] Furthermore, step 3 includes the following steps: Step 3-1: Fit the inner ring of the first bearing onto the positioning boss of the tooling base to achieve positioning; Step 3-2: Install the outer ring of the bearing on the outside of the inner ring of the first bearing, and then install the process cage between the inner ring of the first bearing and the outer ring of the bearing; Step 3-3: Install the second formal cage into the bearing outer ring, positioned above the process cage. At this point, the hole in the second formal cage and the ball groove of the bearing outer ring are in the same position. Steps 3-4: Install the stop piece into the bearing, positioned on the upper end face of the inner ring of the first bearing; Steps 3-5: Insert the balls located in the second layer into the ball holes in the second formal cage, and use the stop ring to stop in the radial direction; Steps 3-6: Install the second bearing inner ring into the bearing outer ring and press it onto the upper end face of the stop; then gently press the upper end face of the second bearing inner ring and pull out the stop from the center hole and the hollow part of the tooling base. When the stop is completely pulled out, the position of the second bearing inner ring moves down and contacts the first bearing inner ring. At this time, the ball installation in the second formal cage is completed. Furthermore, in steps 3 and 5, the upper end face of the stop is higher than the lowest point of the ball, but lower than the center point of the ball.

[0009] The advantages and positive effects of this invention are as follows: 1. No additional impurities are introduced during assembly. The entire assembly process does not use auxiliary materials such as grease or lubricant, thus avoiding grease residue from the source and completely solving the problem of decreased precision caused by small gaps and incomplete cleaning in traditional processes.

[0010] 2. Higher assembly efficiency The process retainer and stop components are used in conjunction with the tooling base to position the beads, eliminating the need for manual bead gluing and waiting for curing. This makes bead loading smoother, positioning more accurate, and significantly improves assembly speed.

[0011] 3. Improved assembly precision and consistency With the tooling base positioning boss and rigid process cage for precise alignment, the coaxiality and positional accuracy of the inner bearing outer ring, cage, and balls are higher, making it suitable for mass production of high-precision bearings.

[0012] 4. Cleaning difficulty is greatly reduced. With no grease residue, the finished product only needs a simple overall cleaning to meet the standards. The cleaning time is short and the effect is good, which improves the pass rate of the finished product.

[0013] 5. The tooling structure is simple and easy to operate. The tooling base, stop parts and process retainer have a universal structure. The stop parts are easy to disassemble and pull out. The flipping and pressing can be completed manually, which is suitable for on-site operations. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the integrated double-row angular contact ball bearing involved in this invention; Figure 2 This is a structural diagram of the tooling base used in the method of this invention; Figure 3 This is a schematic diagram of the structure of the stop used in the method of the present invention; Figure 4 This is a schematic diagram of the method of the present invention, in which the tooling base is placed on the mounting platform; Figure 5 This is a schematic diagram of the method of the present invention for positioning the inner ring of the first bearing on the tooling base; Figure 6 This is a schematic diagram of the method of the present invention, which mates the bearing outer ring, the process cage, and the first bearing inner ring. Figure 7 This is a schematic diagram of the method of the present invention in which the second formal cage is installed in the outer ring of the bearing; Figure 8 This is a schematic diagram of the method of the present invention, in which the stop is placed on the upper end of the inner ring of the first bearing; Figure 9 This is a schematic diagram of the method of the present invention for installing balls in the second formal retainer; Figure 10 This is a schematic diagram of the method of the present invention for installing the inner ring of the second bearing into the upper end of the stop member; Figure 11 This is a schematic diagram illustrating the method of the present invention for removing the stopper to complete the installation of ball bearings on one side; Figure 12 This is a schematic diagram of the method of the present invention for completing the installation of the ball bearings on the other side after the bearing is reversed; In the diagram: 1. Integrated double-row angular contact ball bearing; 1-1. First formal cage; 1-2. First bearing inner ring; 1-3. Bearing outer ring; 1-4. Second bearing inner ring; 1-5. Second formal cage; 1-6. Balls in the second layer; 1-7. Balls in the first layer; 2. Tooling base; 2-1. Circular support platform; 2-2. Positioning boss; 2-3. Top cylindrical platform; 2-4. Top plate; 2-5. Support column; 2-6. Base plate; 3. Stop; 3-1. Stop ring part; 3-2. Pull tab part; 3-3. Opening; 4. Mounting platform; 5. Process cage. Detailed Implementation

[0015] The structure of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] For assembly instructions on integrated double-row angular contact ball bearings, please refer to [link / reference]. Figures 1-12 The tooling structure used in this assembly method includes a tooling base 2, a stop 3, and a process retainer 5.

[0017] The tooling base 2, see Figure 2This fixture is used to position the inner ring of the bearing and prevent it from moving horizontally. A circular support platform 2-1 is provided at the upper end of the fixture base, and a positioning boss 2-2 is provided at the center of the circular support platform. The outer diameter of the positioning boss matches the inner diameter of the bearing inner ring, allowing for a clearance fit between the bearing inner ring and the positioning boss. The outer diameter of the circular support platform needs to be smaller than the outer diameter of the bearing inner ring. The middle part of the fixture base adopts a hollow structure, and a central hole is provided at the upper part of the fixture base, which communicates with the hollow structure in the middle. In this invention, the fixture base is composed of a top cylindrical platform 2-3, a top plate 2-4, three supporting columns 2-5, and a bottom plate 2-6 arranged sequentially from top to bottom. The top surface of the top cylindrical platform forms the circular support platform. The three supporting columns are arranged circumferentially and connected between the top plate and the bottom plate, forming a hollow structure between the three supporting columns.

[0018] The stop member, see [reference] Figure 3 This device is used to secure the ball bearings within the cage holes during ball bearing installation, preventing them from slipping out. The stop is made of a flexible material, such as, but not limited to, soft rubber, with a hardness of 20A. The stop consists of a stop ring portion 3-1 and a pull tab portion 3-2. An opening 3-3 is provided in the stop ring portion, and the pull tab portion is inverted L-shaped, with its upper horizontal edge connected to the inner ring of the stop near the opening. In use, the stop ring is positioned between two rigid sleeves. When the lower end of the pull tab portion is pulled down, the stop, being made of flexible material and having an opening, can be pulled out from between the two rigid sleeves, bringing them into close contact.

[0019] The process cage is an auxiliary structural component for installing balls. The process cage can adopt the same structural form as the formal cage of the bearing, or it can adopt a simple rigid sleeve. The inner diameter, outer diameter and height of the rigid sleeve are the same as the inner diameter, outer diameter and height of the formal cage, respectively.

[0020] The assembly method using the above-mentioned tooling structure includes the following steps: Step 1, Preparation stage: Clean the inner bearing outer ring, formal cage, process cage, balls and stops of the bearing.

[0021] Step 2: Clean and wipe the mounting platform 4 and the fixture base clean. Then place the fixture base on top of the mounting platform. (See attached image) Figure 4 .

[0022] Step 3: Position the inner ring of the first bearing at the positioning boss on the tooling base. With the help of the process cage and stop, complete the installation of the outer ring of the bearing, the second formal bearing cage, and the balls inside the second formal bearing cage. This includes the following steps: Step 3-1: Fit the inner ring 1-2 of the first bearing onto the positioning boss of the tooling base to achieve positioning; see [link / reference] Figure 5 .

[0023] Step 3-2: Install the outer ring 1-3 of the bearing on the outside of the inner ring of the first bearing, and then install the process cage 5 between the inner ring and the outer ring of the first bearing. Figure 6 .

[0024] Step 3-3: Install the second formal cage 1-5 into the bearing outer ring, positioned above the process cage. At this point, the hole in the second formal cage and the ball raceway of the bearing outer ring are in the same position. (See...) Figure 7 .

[0025] Steps 3-4: Install the stop piece 3 into the bearing as shown in the diagram, positioned on the upper end face of the inner ring of the first bearing. Figure 8 .

[0026] Steps 3-5: Insert the balls 1-6 located in the second layer into the ball holes of the second formal cage. The upper end face of the stop is higher than the lowest point of the ball but lower than the center point of the ball, ensuring that the ball stays in the ball hole of the cage. See Figure 9 .

[0027] Steps 3-6: Install the second bearing inner ring 1-4 into the bearing outer ring and press it onto the upper end face of the stop member, see... Figure 10 Then, gently press the upper end face of the second bearing inner ring and pull out the stop piece from the center hole and the cutout of the tooling base. When the stop piece is fully pulled out, the position of the second bearing inner ring moves down and contacts the first bearing inner ring. At this point, the ball installation in the second formal cage is completed. See [link to documentation]. Figure 11 .

[0028] Step 4: Clamp the two bearing inner rings of the assembled half-bearing product from the fixture base by hand, then flip it over so that the second bearing inner ring with the balls installed is facing down. Place it on the upper surface of the work base and use the positioning boss at the upper end to position the second bearing inner ring. See [link to relevant documentation]. Figure 12 .

[0029] Step 5: First, remove the first bearing inner ring and process cage, then install the first formal cage 1-1, and follow the process from Step 3-4 to Step 3-6 to install the balls 1-7 located in the first layer into the ball holes of the first formal cage, and remove the stop piece to press the first bearing inner ring and the second bearing inner ring together to complete the bearing assembly; after the bearing is assembled, clean the whole assembly to complete the installation 1 of the integrated double row angular contact ball bearing.

[0030] Although embodiments and drawings of the present invention have been disclosed for illustrative purposes, those skilled in the art will understand that various substitutions, variations and modifications are possible without departing from the spirit and scope of the present invention and the appended claims. Therefore, the scope of the present invention is not limited to the contents disclosed in the embodiments and drawings.

Claims

1. An assembly method for an integrated double-row angular contact ball bearing, characterized in that: The tooling structure used in this assembly method includes a tooling base, a stop, and a process retainer; The upper end of the tooling base is provided with a circular support platform, and a positioning boss is provided at the center of the circular support platform. The outer diameter of the positioning boss matches the inner diameter of the bearing inner ring to achieve a clearance insertion fit between the bearing inner ring and the positioning boss. The middle part of the tooling base adopts a hollow structure, and a central hole is provided at the upper part of the tooling base. The central hole is connected to the hollow structure in the middle. The stop is made of flexible material and consists of a stop ring and a pull tab. The stop ring has an opening, and the pull tab is inverted L-shaped. The end of the upper horizontal edge of the pull tab is connected to the inner ring of the stop near the opening. The process retainer is a rigid sleeve, and its inner diameter, outer diameter, and height are consistent with those of the formal retainer. The assembly method includes the following steps: Step 1: Clean the inner bearing outer ring, main bearing cage, process cage, balls, and stop components of the bearing. Step 2: Clean and wipe the installation platform and tooling base clean, and then place the tooling base on the top of the installation platform; Step 3: Position and install the first bearing inner ring on the positioning boss of the tooling base; set a process retainer on the outside of the first bearing inner ring to support the second formal bearing retainer; set a stop at the upper end of the first bearing inner ring to support the second bearing inner ring; complete the installation of the bearing outer ring, the second formal bearing retainer, the balls inside the second formal bearing retainer and the second bearing inner ring, and after the installation is completed, pull out the stop from the cutout of the tooling base; Step 4: Clamp the two bearing inner rings of the half bearing product assembled in Step 3 by hand, remove it from the tooling base, then flip it over, place the second bearing inner ring with the balls installed facing down on the upper surface of the working base, and use the positioning boss at the upper end to position the second bearing inner ring. Step 5: First, remove the first bearing inner ring and process cage, then install the first formal cage and stop, completing the installation of the balls in the first formal cage. After the balls are installed, press the first bearing inner ring and remove the stop to press the first bearing inner ring and the second bearing inner ring together, completing the bearing assembly. After the bearing is assembled, clean the entire assembly.

2. The assembly method of the integrated double-row angular contact ball bearing according to claim 1, characterized in that: The outer diameter of the circular support platform is smaller than the outer diameter of the bearing inner ring; the tooling base is composed of a top cylindrical platform, a top plate, three support columns and a bottom plate arranged sequentially from top to bottom; the top surface of the top cylindrical platform forms the circular support platform, the three support columns are arranged circumferentially, the three support columns are connected between the top plate and the bottom plate, and a hollow is formed between the three support columns.

3. The assembly method of the integrated double-row angular contact ball bearing according to claim 1, characterized in that: The stop is made of soft rubber with a hardness of 20A.

4. The assembly method of the integrated double-row angular contact ball bearing according to claim 1, characterized in that: Step 3 includes the following steps: Step 3-1: Fit the inner ring of the first bearing onto the positioning boss of the tooling base to achieve positioning; Step 3-2: Install the outer ring of the bearing on the outside of the inner ring of the first bearing, and then install the process cage between the inner ring of the first bearing and the outer ring of the bearing; Step 3-3: Install the second formal cage into the bearing outer ring, positioned above the process cage. At this point, the hole in the second formal cage and the ball groove of the bearing outer ring are in the same position. Steps 3-4: Install the stop piece into the bearing, positioned on the upper end face of the inner ring of the first bearing; Steps 3-5: Insert the balls located in the second layer into the ball holes in the second formal cage, and use the stop ring to stop in the radial direction; Steps 3-6: Install the second bearing inner ring into the bearing outer ring and press it onto the upper end face of the stop; then gently press the upper end face of the second bearing inner ring and pull out the stop from the center hole and the cutout of the tooling base. When the stop is completely pulled out, the position of the second bearing inner ring moves down and contacts the first bearing inner ring, completing the installation of the balls in the second formal cage.

5. The assembly method of the integrated double-row angular contact ball bearing according to claim 1, characterized in that: In steps 3 and 5, the upper end face of the stop is higher than the lowest point of the ball, but lower than the center point of the ball.

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