Assembling device for self-pre-tightening back-to-back assembled angular contact ball bearings

Abstract

The utility model relates to the field of bearing machining, and particularly discloses an assembling device for self-pretightening back-to-back paired angular contact ball bearings. The assembling device comprises a first assembling assembly and a second assembling assembly, the first assembling assembly comprises a first assembling die, a first assembling boss is arranged on the top face of the first assembling die, and an inner ring mounting hole is formed in the first assembling boss; the second assembling component comprises a second assembling die and a retainer positioning ring, a positioning mandrel is arranged on the top surface of the second assembling die, and an inner ring positioning step is arranged on the outer side of the positioning mandrel; the retainer positioning ring and the second assembly die are arranged in a split mode, and the inner diameter of the retainer positioning ring is larger than that of the positioning mandrel. By means of the assembling device, assembling of the back-to-back assembly angular contact ball bearings can be completed ingeniously, efficient and reliable assembling operation is achieved, and efficient production of the back-to-back assembly angular contact ball bearings is guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to bearing processing field especially, it relates to a kind of self-preloading back-to-back matched angular contact ball bearing's assembling device. BACKGROUND

[0002] Angular contact ball bearing is a kind of special ball bearing type, can simultaneously bear radial load and axial load, and can work at high speed. Angular contact ball bearing includes inner ring, outer ring, rolling element and retainer as conventional deep groove ball bearing, but different from angular contact ball bearing channel and conventional deep groove ball bearing, especially the channel of outer ring rib exists essential difference. Specifically, one side of outer ring channel is high rib, the other side is low rib, and the rolling element can enter the channel by passing low rib during assembly, and the high rib in it is load side.

[0003] Angular contact ball bearing is generally used in actual application, that is, two sets, three sets or more sets of angular contact ball bearings are used in a certain configuration mode, and the basic assembly mode includes back-to-back matched, face-to-face matched and series matched, and different assembly modes are selected according to actual working conditions. The face-to-face matched mode is that the low ribs of the outer ring channels of two angular contact ball bearings are arranged face to face, the series matched mode is that the low ribs of the outer ring channels of two angular contact ball bearings are arranged in the same direction and each bearing is arranged in sequence along the axial direction, and the back-to-back matched mode is that the low ribs of the outer ring channels of two angular contact ball bearings are arranged back to back.

[0004] Double-row angular contact ball bearing is a specific form of angular contact ball bearing, and two channels are arranged on the inner ring, and two outer rings are arranged correspondingly, and one channel is arranged on each outer ring, which has the advantage of small axial space occupation. Double-row angular contact ball bearing also has face-to-face matched mode and series matched mode, such as Chinese invention patent application CN 105114447 A discloses a face-to-face matched double-row angular contact ball bearing and its assembly method, and Chinese invention patent CN 105041852 B discloses a series matched angular contact ball bearing and its assembly method.

[0005] As shown in Figure 1 It is the structure diagram of self-preloading back-to-back matched angular contact ball bearing, including inner ring 06, first outer ring 01, first retainer 07, second outer ring 03, second retainer 04 and rolling element 05, and spacer ring 02 is arranged between first outer ring 01 and second outer ring 03. Figure 2The structure diagram of the first outer ring 01 or the second outer ring 03 is shown, wherein one side of the groove 10 is a low side 08, and the other side is a high side 09. Compared with the face-to-face assembly mode and the series assembly mode, the back-to-back assembly mode has the advantages of reliable assembly, simultaneous bearing of axial loads in two directions, and self-preloading, but the back-to-back assembly mode of the double-row angular contact ball bearing also has the disadvantages of large assembly difficulty, large pre-tightening force control difficulty, and inconvenient pre-tightening force adjustment, which limits the production efficiency and large-scale promotion of the back-to-back assembly angular contact ball bearing. SUMMARY

[0006] The technical problem to be solved by the utility model is to provide an assembly device of a self-preloaded back-to-back assembly angular contact ball bearing, which can cleverly complete the assembly of the back-to-back assembly angular contact ball bearing, realize efficient and reliable assembly operation, and ensure efficient production of the back-to-back assembly angular contact ball bearing.

[0007] In order to solve the above technical problem, the utility model provides the technical scheme as follows: an assembly device of a self-preloaded back-to-back assembly angular contact ball bearing, comprising a first assembly component and a second assembly component, the first assembly component comprises a first assembly mold, the top surface of the first assembly mold is provided with a first assembly boss, and an inner ring mounting hole is arranged on the first assembly boss; the second assembly component comprises a second assembly mold and a retainer positioning ring, the top surface of the second assembly mold is provided with a positioning mandrel, and the outer side of the positioning mandrel is provided with an inner ring positioning step; the retainer positioning ring is separately arranged from the second assembly mold, and the inner diameter of the retainer positioning ring is greater than the positioning mandrel.

[0008] The assembly process of the self-preloaded back-to-back assembly angular contact ball bearing comprises a first outer ring assembly step, a second outer ring assembly step and a spacer ring assembly step.

[0009] The first outer ring assembly step adopts the first assembly component, the inner ring is mounted into the inner ring mounting hole, the first outer ring is placed on the first assembly mold and is sleeved outside the first assembly boss, and the first retainer is placed on the first assembly boss. The rolling body is sequentially mounted into the first retainer, and in the process of mounting the rolling body, the first outer ring plays a role in limiting the outward movement of the rolling body. The first outer ring is lifted upwards, and the rolling body is pressed into the groove of the first outer ring, and the assembly operation of the first outer ring is completed.

[0010] The second outer ring assembling step adopts a second assembling assembly to install the intermediate piece in a second assembling mold in a reversed direction, wherein the inner ring is sleeved on a positioning mandrel, and the first end of the inner ring is arranged on an inner ring positioning step. The second outer ring is sleeved on the inner ring, a retainer positioning ring is arranged on the first retainer, and then the second retainer is arranged on the retainer positioning ring. The rolling elements are sequentially arranged in the second retainer, the second outer ring is lifted upwards, and the rolling elements are pressed into the grooves of the second outer ring, that is, the assembling operation of the second outer ring is completed. Then, a spacer ring is pressed between the first outer ring and the second outer ring, and the assembling of the bearing is completed.

[0011] The optional equipment of the application can skillfully complete the assembling of the back-to-back group of angular contact ball bearings, realize efficient and reliable assembling operation, and ensure efficient and reliable production of the back-to-back group of angular contact ball bearings.

[0012] Preferably, the retainer positioning ring is circumferentially divided into at least two sub-rings, and each sub-ring corresponds to a central angle of not more than 180°. After the assembling is completed, the retainer positioning ring can be smoothly and conveniently removed.

[0013] Preferably, the height of the first assembling boss is h, the outer diameter is D, the height of the inner ring mounting hole is H, and the hole diameter is d, and h=0.3~0.4H and d=0.85~0.9D.

[0014] Preferably, the outer diameter of the inner ring positioning step is B, and the outer diameter of the positioning mandrel is b, and b=0.8~0.85B.

[0015] Preferably, the spacer ring optional module further comprises an optional mounting seat, an optional load block, and an end face measuring instrument, the top surface of the optional mounting seat is an outer ring positioning surface, the outer ring positioning surface is provided with an inner ring accommodating hole, and the end face measuring instrument is arranged in the inner ring accommodating hole; the optional load block is provided with an inner ring loading surface.

[0016] During the spacer ring optional operation, the first outer ring, the first retainer, and the corresponding number of rolling elements are assembled at the first end of the inner ring, the inner ring is inserted into the inner ring accommodating hole, the detection end of the end face measuring instrument is in contact with the end face of the inner ring, the inner ring loading surface of the optional load block is pressed on the first outer ring, and the reading of the end face measuring instrument is recorded. The first outer ring and the first retainer are disassembled, the second outer ring, the second retainer, and the corresponding number of rolling elements are assembled at the second end of the inner ring, the inner ring is inserted into the inner ring accommodating hole, the detection end of the end face measuring instrument is in contact with the end face of the inner ring, the lower end face of the second outer ring is arranged on the outer ring positioning surface, the inner ring loading surface of the optional load block is pressed on the second outer ring, and the reading of the end face measuring instrument is recorded. According to the two readings of the end face measuring instrument, the height of the spacer ring can be determined, and the corresponding spacer ring can be selected.

[0017] Before assembly, the height requirement of the spacer ring can be determined through the spacer ring selection operation, and then the corresponding spacer ring is selected and assembled, which can effectively improve the pre-tightening force setting accuracy of the back-to-back assembled angular contact ball bearing and simplify the pre-tightening force adjustment operation.

[0018] As preferred, the selection mounting base comprises a mounting base and a standard ring, the mounting base and the standard ring are arranged in an upper and lower split mode, the inner ring accommodating hole penetrates through the standard ring and extends into the mounting base; the end face measuring instrument is arranged in the mounting base, and the detection end of the end face measuring instrument is arranged in alignment with the upper end face of the mounting base.

[0019] The length of the standard ring corresponds to the length of the inner ring, and different specifications of the standard ring can be selected according to different lengths of the inner ring, thereby improving the application range.

[0020] As preferred, the loading end of the selection load block is provided with a limiting mandrel, the outer side of the limiting mandrel is provided with an annularly distributed inner ring loading step, and the inner ring loading surface is arranged on the inner ring loading step. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 is a sectional view of the self-pre-tightening back-to-back assembled angular contact ball bearing;

[0022] Figure 2 is a sectional view of the first outer ring or the second outer ring in the self-pre-tightening back-to-back assembled angular contact ball bearing;

[0023] Figure 3 is a structural schematic view of the spacer ring selection module in the selection equipment of the self-pre-tightening back-to-back assembled angular contact ball bearing of the embodiment;

[0024] Figure 4 is a structural schematic view of the spacer ring selection module in the selection equipment of the self-pre-tightening back-to-back assembled angular contact ball bearing of the embodiment in a spacer ring selection operation state;

[0025] Figure 5 is a sectional view of the self-pre-tightening back-to-back assembled angular contact ball bearing; Figure 4 is a local enlarged view of A in FIG. 8;

[0026] Figure 6 is a structural schematic view of the first assembly component in the selection equipment of the self-pre-tightening back-to-back assembled angular contact ball bearing of the embodiment;

[0027] Figure 7 is a structural schematic view of the first assembly component in the selection equipment of the self-pre-tightening back-to-back assembled angular contact ball bearing of the embodiment in a first outer ring assembly state, and the rolling body is not pressed into the first outer ring at this time;

[0028] Figure 8This is a structural diagram of the first assembly component in the first outer ring assembly state of the self-preloaded back-to-back diagonal contact ball bearing selection equipment in this embodiment, where the rolling elements have been pressed into the first outer ring.

[0029] Figure 9 This is a schematic diagram of the structure of the second assembly component in the optional equipment for the self-preloaded back-to-back diagonal contact ball bearings in this embodiment;

[0030] Figure 10 This is a structural diagram of the second assembly component in the optional equipment for the preloaded back-to-back diagonal contact ball bearings of this embodiment, showing the second outer ring being assembled. At this time, the cage positioning ring is installed.

[0031] Figure 11 This is a schematic diagram of the second assembly assembly in the second outer ring assembly state of the optional equipment for the self-preloaded back-to-back diagonal contact ball bearing in this embodiment. At this time, the rolling elements are installed but not pressed into the second outer ring.

[0032] Figure 12 This is a structural diagram of the second assembly component in the optional equipment for the preloaded back-to-back diagonal contact ball bearings of this embodiment, showing the second outer ring being assembled. At this point, the rolling elements have been pressed into the second outer ring.

[0033] Figure 13 This is a schematic diagram of the testing device in the optional equipment for the self-preloaded back-to-back diagonal contact ball bearings in this embodiment;

[0034] Figure 14 This is a schematic diagram of the inner ring clamping assembly in the optional equipment for the self-preloaded back-to-back diagonal contact ball bearings in this embodiment;

[0035] Figure 15 This is a schematic diagram of the structure of the outer ring mounting assembly and the self-weight compensation assembly in the optional equipment of the self-preloaded back-to-back diagonal contact ball bearing in this embodiment. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model. Example

[0037] like Figure 1 As shown, Figures 3-15 As shown, the optional equipment for self-preloaded back-to-back diagonal contact ball bearings includes a spacer selection module, an assembly device, and a testing device, which are set up separately.

[0038] Specifically, such as Figures 3-5As shown, the spacer ring selection module comprises a selection mounting seat 13, a selection load block 11 and an end face measuring instrument 12. The top surface of the selection mounting seat 13 is an outer ring positioning surface 151. An inner ring accommodating hole 14 is formed in the outer ring positioning surface 151. The end face measuring instrument 12 is arranged in the inner ring accommodating hole 14. The selection load block 11 is provided with an inner ring loading surface 111. The loading end of the selection load block 11 is provided with a limiting core shaft 112. The outer side of the limiting core shaft 112 is provided with an annularly distributed inner ring loading step. The inner ring loading surface 111 is arranged on the inner ring loading step. The limiting core shaft 112 is used for inserting into the inner ring and plays a positioning role between the selection load block 11 and the inner ring.

[0039] Specifically, as shown in the figure, Figures 3-5 As shown, the selection mounting seat 13 comprises a mounting base and a standard ring 15. The mounting base and the standard ring 15 are arranged in an upper and lower split mode. The inner ring accommodating hole 14 penetrates through the standard ring 15 and extends into the mounting base. The end face measuring instrument 12 is arranged in the mounting base. The detection end of the end face measuring instrument 12 is arranged in alignment with the upper end surface of the mounting base. The length of the standard ring 15 corresponds to the length of the inner ring. According to different lengths of the inner ring, different specifications of the standard ring 15 can be selected to improve the application range.

[0040] During the spacer ring selection operation, the first outer ring, the first retainer and the corresponding number of rolling elements are assembled at the first end of the inner ring. The inner ring is inserted into the inner ring accommodating hole 14. The detection end of the end face measuring instrument 12 is in contact with the end surface of the inner ring. The inner ring loading surface 111 of the selection load block 11 is pressed on the first outer ring. The reading of the end face measuring instrument 12 is recorded. The first outer ring and the first retainer are disassembled. The second outer ring, the second retainer and the corresponding number of rolling elements are assembled at the second end of the inner ring. The inner ring is inserted into the inner ring accommodating hole 14. The detection end of the end face measuring instrument 12 is in contact with the end surface of the inner ring. The lower end surface of the second outer ring is arranged on the outer ring positioning surface 151. The inner ring loading surface 111 of the selection load block 11 is pressed on the second outer ring. The reading of the end face measuring instrument 12 is recorded. The height of the spacer ring can be determined according to the two readings of the end face measuring instrument 12. The corresponding spacer ring can be selected.

[0041] Before assembly, the height requirement of the spacer ring can be determined through the spacer ring selection operation. Then the corresponding spacer ring is selected for assembly. The pre-tightening force setting accuracy of the back-to-back group angular contact ball bearing can be effectively improved. The pre-tightening force adjustment operation is simplified.

[0042] As shown in the figure, Figures 6-12 The assembly device comprises a first assembly component and a second assembly component. As shown in the figure, Figures 6-8As shown, the first assembly component includes a first assembly mold 21, the top surface of which is provided with a first assembly boss 22, and the first assembly boss 22 is provided with an inner ring mounting hole 23. Specifically, the height of the first assembly boss 22 is denoted as h, the outer diameter is denoted as D, the height of the inner ring mounting hole 23 is denoted as H, and the hole diameter is denoted as d, so h = 0.3 ~ 0.4H, d = 0.85 ~ 0.9D.

[0043] The first outer ring assembly step adopts the first assembly component, the inner ring is mounted into the inner ring mounting hole 23, the first outer ring is placed on the first assembly mold 21 and is sleeved outside the first assembly boss 22, and the first retainer is placed on the first assembly boss 22. The rolling elements are sequentially mounted into the first retainer, and in the process of mounting the rolling elements, the first outer ring plays a role in limiting the outward movement of the rolling elements. The first outer ring is lifted upwards, and the rolling elements are pressed into the grooves of the first outer ring, completing the assembly operation of the first outer ring.

[0044] As shown in the figure, Figures 9-12 The second assembly component includes a second assembly mold 24 and a retainer positioning ring 27, the top surface of the second assembly mold 24 is provided with a positioning mandrel 26, and the outer side of the positioning mandrel 26 is provided with an inner ring positioning step 25. The retainer positioning ring 27 is separately provided with the second assembly mold 24, and the inner diameter of the retainer positioning ring 27 is greater than the positioning mandrel 26. Specifically, the outer diameter of the inner ring positioning step 25 is denoted as B, and the outer diameter of the positioning mandrel 26 is denoted as b, so b = 0.8 ~ 0.85B. The retainer positioning ring 27 is divided into at least two sub-rings along the circumference, and the central angle of each sub-ring is not greater than 180°. After assembly is completed, the retainer positioning ring 27 can be smoothly and conveniently removed.

[0045] The second outer ring assembly step adopts the second assembly component, and the intermediate piece is installed in the second assembly mold 24 in the reverse direction, the inner ring of which is sleeved on the positioning mandrel 26, and the first end of the inner ring is arranged on the inner ring positioning step 25. The second outer ring is sleeved outside the inner ring, the retainer positioning ring 27 is arranged on the first retainer, and then the second retainer is arranged on the retainer positioning ring 27. The rolling elements are sequentially mounted into the second retainer, the second outer ring is lifted upwards, and the rolling elements are pressed into the grooves of the second outer ring, that is, the assembly operation of the second outer ring is completed. Then, the spacer ring is pressed between the first outer ring and the second outer ring, completing the assembly of the bearing.

[0046] As shown in the figure, Figures 13-15As shown in the figure, the test device comprises an outer ring mounting assembly, an inner ring clamping assembly 34 and a torque measuring assembly 35. The outer ring mounting assembly comprises a test mounting seat 32 and a test load block 31, the top surface of the test mounting seat 32 is an outer ring bearing surface 321, and the test load block 31 is provided with an outer ring loading surface 311. Specifically, the test load block 31 is provided with a relief hole 312, and the relief hole 312 penetrates the test load block 31 in the axial direction. In the test state, the test load block 31 is located above the test mounting seat 32, and an outer ring mounting interval is formed between the outer ring loading surface 311 and the outer ring bearing surface 321. The upper end of the clamping rod 341 is arranged through the relief hole 312, and the torque measuring assembly 35 is connected with the upper end of the clamping rod 341.

[0047] As shown in the figure, Figure 13 and Figure 14 The inner ring clamping assembly 34 comprises a clamping rod 341 and two clamping end covers 342, the clamping end covers 342 are connected with the clamping rod 341, and an inner ring clamping interval is formed between the two clamping end covers 342. One end of the clamping rod 341 is integrally arranged with one of the clamping end covers 342, and the other clamping end cover 342 is detachably arranged on the clamping rod 341. The inner ring clamping assembly 34 further comprises a locking ring 343, the locking ring 343 is arranged on the clamping rod 341 and is threadedly connected with the clamping rod 341. The torque measuring assembly 35 comprises a torque wrench, and the torque measuring assembly 35 is detachably connected with the clamping rod 341.

[0048] In order to reduce the influence of the self-weight of the inner ring and the inner ring clamping assembly 34 on the torque measurement result, the inner ring clamping assembly 34 is made of plastic with smaller density.

[0049] In the measurement process, the inner ring is placed between the two clamping end covers 342 and locked, one end of the outer ring is placed on the outer ring bearing surface 321 of the test mounting seat 32, and the test load block 31 is placed on the other end of the outer ring. The test load block 31 and the test mounting seat 32 jointly compress the outer ring. The torque measuring assembly 35 is connected with the clamping rod 341, the inner ring and the inner ring clamping assembly 34 are driven to rotate relative to the outer ring, and the actual measured starting torque is obtained through the torque measuring assembly 35.

[0050] As shown in the figure, Figure 13 and Figure 15As shown, further, the outer ring bearing surface 321 is provided with a compensation operation hole 322, and the test device further comprises a self-weight compensation assembly 33, the self-weight compensation assembly 33 comprises a top plate 331 and an adjusting mechanism 332, the top plate 331 is arranged in the compensation operation hole 322, the adjusting mechanism 332 is connected with the test mounting seat 32 and is adjusted up and down, the top plate 331 is connected with the adjusting mechanism 332, and a pressure sensor is arranged between the top plate 331 and the adjusting mechanism 332. Specifically, the top plate 331 and the adjusting mechanism 332 are connected through a spring 333.

[0051] When the starting torque measurement is performed, the inner ring and the inner ring clamping assembly 34 are placed on the outer ring bearing surface 321, the position of the top plate 331 is adjusted through the adjusting mechanism 332, until the top plate 331 is in contact with the inner ring clamping assembly 34, and the self-weight of the inner ring and the inner ring clamping assembly 34 is compensated by the top plate 331. The size of the compensation force can be directly obtained through the pressure sensor, and the size of the compensation force is adjusted through the adjusting mechanism 332 until the compensation force basically compensates the self-weight of the inner ring and the inner ring clamping assembly 34. The top plate 331 is floatingly arranged through the spring 333, so that the size of the compensation force is more convenient to adjust, and the adjustment accuracy is more reliable.

[0052] The matching equipment of the application can skillfully complete the assembly of the back-to-back group angular contact ball bearing, realize efficient and reliable assembly operation, and measure the starting torque of the bearing, so as to replace the pre-tightening force measurement with the starting torque measurement to determine the bearing processing quality and ensure the efficient and reliable production of the back-to-back group angular contact ball bearing.

[0053] The matching method of the self-pre-tightening back-to-back group angular contact ball bearing comprises the following steps:

[0054] S01. Spacing ring height measurement: select the inner ring 06, the first outer ring 01, the first retainer 07, the second outer ring 03, the second retainer 04 and a specific number of rolling bodies 05.

[0055] The first outer ring, the first retainer and the corresponding number of rolling bodies are assembled at the first end of the inner ring by using the spacing ring matching module, the inner ring is inserted into the inner ring accommodating hole 14 with the second end downward, the detection end of the end face measuring instrument 12 is in contact with the end face of the second end of the inner ring, the lower end face of the first outer ring is placed on the outer ring positioning face 151, the inner ring loading face 111 of the matching load block 11 is pressed on the upper end face of the first outer ring, and the reading of the end face measuring instrument 12 is recorded, that is, as shown in the state. Figure 4

[0056] ​Disassemble the first outer ring and the first retainer, assemble the second outer ring, the second retainer and the corresponding number of rolling elements on the second end of the inner ring, the inner ring is inserted into the inner ring accommodating hole 14 with the first end downward, the detection end of the end face measuring instrument 12 is in contact with the end face of the first end of the inner ring, the lower end face of the second outer ring is placed on the outer ring positioning face 151, the inner ring loading face 111 of the selected load block 11 is pressed on the upper end face of the second outer ring, and the reading of the end face measuring instrument 12 is recorded. The height of the spacer ring is determined according to the two readings of the end face measuring instrument 12, and the corresponding spacer ring 02 is selected.

[0057] S02. Spacer ring grouping: measure the height of the spacer ring, and divide a certain number of spacer rings into several groups with a height accuracy of 2um. After the measurement is completed, the spacer ring is cut into two half rings along the diameter line. By measuring and grouping the spacer ring, the selection and replacement of the spacer ring are facilitated, and the selection efficiency is improved. The half ring can be conveniently pressed into the first outer ring and the second outer ring from both sides.

[0058] S1. First outer ring assembly: using the first assembly assembly, the inner ring is assembled into the inner ring mounting hole 23 with the first end upward and the second end downward, at this time the first channel on the inner ring is higher than the first assembly boss 22, and the second channel on the inner ring is located in the inner ring mounting hole 23; the first outer ring is placed on the top surface of the first assembly mold 21 and is sleeved outside the first assembly boss 22, at this time the low stop edge of the channel on the first outer ring is upwardly arranged. The first retainer is placed on the first assembly boss 22, and the ball pocket hole of the first retainer is aligned with the first channel of the inner ring. A certain number of rolling elements are sequentially assembled into the first retainer, and in the process of assembling the rolling elements, the first outer ring limits the outward movement of the rolling elements, that is, as shown in the state. Figure 7 Figure 8

[0059] S2. Second outer ring assembly: using the second assembly assembly, the intermediate piece is mounted on the second assembly mold 24, wherein the inner ring is sleeved on the positioning mandrel 26 with the second end upward, and the first end of the inner ring is arranged on the inner ring positioning step 25, that is, as shown in the state. Figure 10 Figure 11

[0060] ​​​​S3. Spacing ring assembly: press the spacing ring between the first outer ring and the second outer ring, complete the assembly of the bearing, that is, as shown in the state. Figure 12

[0061] S4. Starting torque test: use the inner ring clamping assembly 34 to place the inner ring between the two clamping end covers 342 and lock it, that is, as shown in the state. Figure 14 Place one end of the outer ring on the outer ring bearing surface 321 of the test mounting seat 32, and place the test load block 31 on the other end of the outer ring, and the outer ring loading surface 311 is in contact with the corresponding end surface of the outer ring. The test load block 31 and the test mounting seat 32 jointly press the outer ring, that is, as shown in the state. Figure 13 Connect the torque measurement assembly 35 with the clamping rod 341, drive the inner ring and the inner ring clamping assembly 34 to rotate relative to the outer ring, and obtain the measured starting torque through the torque measurement assembly 35. Compare the measured starting torque with the designed starting torque. If the measured starting torque is not greater than the designed starting torque, it is determined to meet the design requirements, and the product is qualified. When the measured starting torque is greater than the designed starting torque, it is determined that it does not meet the design requirements, the current spacing ring is removed, and the spacing ring adjacent to the current spacing ring is selected, and steps S3 and S4 are repeated.

[0062] In summary, the above only describes the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement and improvement within the spirit and principles of the present application shall be included in the protection scope of the present application.​

Claims

1. Apparatus for assembling a self-preloading back-to-back pair of angular contact ball bearings, characterized in that: The application relates to a first assembly component and a second assembly component, wherein the first assembly component comprises a first assembly die, the top surface of the first assembly die is provided with a first assembly boss, and an inner ring mounting hole is arranged on the first assembly boss; the second assembly component comprises a second assembly die and a retainer positioning ring, the top surface of the second assembly die is provided with a positioning mandrel, the outer side of the positioning mandrel is provided with an inner ring positioning step, and the retainer positioning ring is arranged separately from the second assembly die and has an inner diameter larger than the positioning mandrel.

2. The assembly device of claim 1, wherein: The retainer positioning ring is circumferentially divided into at least two subrings, and the central angle of each subring is not greater than 180 degrees.

3. The assembly device of claim 1, wherein: The height of the first assembly boss is h, the outer diameter is D, the height of the inner ring mounting hole is H, and the hole diameter is d, and h=0.3-0.4H and d=0.85-0.9D.

4. The assembly apparatus of claim 1, wherein: The outer diameter of the inner ring positioning step is B, and the outer diameter of the positioning mandrel is b, and b=0.8-0.85B.

5. The assembly device according to any one of claims 1-4, characterized in that: The application further relates to a spacer selection module, wherein the spacer selection module comprises a selection mounting seat, a selection load block and an end face measuring instrument, the top surface of the selection mounting seat is an outer ring positioning surface, an inner ring accommodating hole is arranged on the outer ring positioning surface, and the end face measuring instrument is arranged in the inner ring accommodating hole; the selection load block is provided with an inner ring loading surface.

6. The assembly apparatus of claim 5, wherein: The selection mounting seat comprises a mounting base and a standard ring, the mounting base and the standard ring are arranged separately in an up-down mode, the inner ring accommodating hole penetrates through the standard ring and extends into the mounting base, the end face measuring instrument is arranged in the mounting base, and the detection end of the end face measuring instrument is arranged in alignment with the upper end surface of the mounting base.

7. The assembly apparatus of claim 5, wherein: The loading end of the selection load block is provided with a limiting mandrel, the outer side of the limiting mandrel is provided with an annularly-distributed inner ring loading step, and the inner ring loading surface is arranged on the inner ring loading step.

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