Adjustable installation gap of a self-aligning roller bearing and adjustment method

Abstract

The application relates to a self-aligning roller bearing with adjustable installation clearance and an adjusting method, which comprises an outer ring, an inner ring, a roller, a retainer, an AOH dismounting sleeve, an HML locking nut, an inner hexagonal cylindrical head screw and a hexagonal head bolt; the HML locking nut is threadedly connected to the AOH dismounting sleeve, the inner hexagonal cylindrical head screw is screwed into the HML locking nut, the HML locking nut is tightly combined with the threads of the AOH dismounting sleeve to lock the HML locking nut; the inner ring is provided with a taper hole, is installed on the AOH dismounting sleeve through cooperation between the taper hole and a taper surface of the AOH dismounting sleeve; the hexagonal head bolt is screwed to push the end surface of the inner ring through the screw rod end, so that the inner ring is slightly withdrawn from the AOH dismounting sleeve to increase the installation clearance. The clearance is reduced through the direction of a hydraulic press, the clearance is increased through reverse withdrawal of the hexagonal head bolt, and the installation clearance can be accurately adjusted to the standard value of CN group through cooperation of the two; the scheme does not need to repeatedly dismount the bearing, can correct the too small installation clearance through bolt fine adjustment, and greatly shortens the installation time.

Description

Technical Field

[0001] This invention relates to the field of rolling bearing technology, specifically to a self-aligning roller bearing with adjustable installation clearance, suitable for the crankshaft support portion of a diaphragm pump. Background Technology

[0002] Self-aligning roller bearings are widely used in rotating shaft supports under heavy loads and impact loads, especially at both ends of the crankshaft in diaphragm pumps, where they bear important loads and provide self-alignment. These bearings typically use a thin oil bath lubrication system with 320 industrial gear oil.

[0003] Traditional double-row self-aligning roller bearings are typically installed by pressing them onto the shaft using a withdrawal sleeve (AOH series) and a hydraulic press. Adjusting the installation clearance (i.e., the radial clearance formed after the bearing inner ring mates with the tapered surface of the withdrawal sleeve) has always been a challenge in field installation. Since bearing installation clearance directly affects bearing life and operating performance, the CN group standard clearance is the recommended value for this type of operating condition.

[0004] In existing technologies, adjusting bearing installation clearance mainly relies on experience. Installers use a hydraulic press to press the bearing into the ejector sleeve, and the amount of pressing determines the size of the installation clearance. However, this unidirectional pressing method has the following drawbacks: (1) The pressing depth is difficult to control precisely. The pressure feedback of the hydraulic press cannot directly reflect the installation clearance value. The operator can only judge the pressing depth based on experience, which leads to a large deviation in the installation clearance. (2) The installation clearance is too small and cannot be corrected. Once the bearing is excessively pressed into the withdrawal sleeve, the installation clearance is less than the standard value of CN group. Traditional methods cannot remove the bearing from the withdrawal sleeve by a small amount. The bearing can only be completely removed and reinstalled, which is extremely inefficient and easily damages the bearing. (3) Low installation efficiency. Repeated disassembly and assembly not only wastes time, but also increases the risk of wear on bearings and withdrawal sleeves, affecting the overall reliability of the equipment.

[0005] Therefore, there is an urgent need for a self-aligning roller bearing structure and adjustment method that can adjust the installation clearance bidirectionally during installation and is easy and reliable to operate. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a self-aligning roller bearing with adjustable installation clearance and its adjustment method, which can achieve precise bidirectional adjustment of installation clearance and significantly improve on-site installation and disassembly efficiency.

[0007] To achieve the above objectives, the technical solution adopted by this invention is: a self-aligning roller bearing with adjustable installation clearance, comprising: an outer ring, an inner ring, rollers, a cage, an AOH withdrawal sleeve, an HML lock nut, a hexagon socket head cap screw, and a hexagon head bolt; the AOH withdrawal sleeve is installed at both ends of the crankshaft, the HML lock nut is threaded onto the AOH withdrawal sleeve, and the hexagon socket head cap screw is screwed into the HML lock nut so that the HML lock nut and the AOH withdrawal sleeve are tightly engaged and locked to fix the HML. L-type locking nut; the inner ring has a tapered hole, which mates with the tapered surface of the AOH withdrawal sleeve to install it onto the AOH withdrawal sleeve; multiple hexagonal head bolts are evenly distributed on the HML locking nut. By screwing in the hexagonal head bolts, the end of the bolt pushes against the end face of the inner ring. The position of the center line of the hexagonal head bolt to the end face of the bearing inner ring is slightly lower than the position of the bearing inner ring raceway. This avoids damage to the inner ring retaining edge during disassembly or adjustment of clearance, thereby slightly removing the inner ring from the AOH withdrawal sleeve to increase the installation clearance.

[0008] Furthermore, the bearing's installation clearance is the CN group standard clearance. When the installation clearance is greater than the CN group standard clearance, the inner ring is further pressed into the AOH withdrawal sleeve using a hydraulic press to reduce the installation clearance; when the installation clearance is less than the CN group standard clearance, the inner ring end face is pushed by screwing in the hexagonal head bolt to increase the installation clearance until the installation clearance meets the CN group standard clearance.

[0009] Preferably, the number of hexagonal head bolts is 8, which are evenly distributed along the circumference of the HML locking nut.

[0010] Furthermore, the HML locking nut is provided with a threaded hole that mates with the hexagonal head bolt, and the threaded hole is arranged to extend through the HML locking nut along its axial direction.

[0011] Furthermore, the internal hexagonal head screw is used to lock the HML locking nut onto the AOH release sleeve to prevent the HML locking nut from axially moving during installation and adjustment.

[0012] Furthermore, the outer ring, inner ring, rollers, and cage are configured as a standard double-row self-aligning roller bearing, and the taper of the inner ring bore matches the taper of the outer tapered surface of the AOH ejector sleeve.

[0013] On the other hand, the present invention provides a method for adjusting bearing mounting clearance, comprising the following steps: Step S1: Install the AOH removal sleeves at both ends of the crankshaft; Step S2: Tighten the HML locking nut into the AOH release sleeve; Step S3: Screw the internal hex socket head cap screw into the HML lock nut, so that the HML lock nut and the AOH release sleeve thread fit tightly together, ensuring that the HML lock nut is fixed and does not move. Step S4: Install the double-row self-aligning roller bearing with tapered bore on the inner ring using the press-fit method. Use a hydraulic press to press the bearing into the AOH ejection sleeve. Step S5: Use a feeler gauge to check the bearing's installation clearance; Step S6: When the installation clearance is greater than the standard clearance of group CN, use a hydraulic press to continue pressing the bearing into the AOH withdrawal sleeve to reduce the installation clearance; Step S7: When the installation clearance is less than the standard clearance of CN group, screw in the evenly distributed hexagonal head bolts, push the inner ring end face through the screw, and the position of the center line of the hexagonal head bolt to the bearing inner ring end face is slightly lower than the position of the bearing inner ring raceway, so that the bearing is slightly removed from the AOH ejection sleeve, increasing the installation clearance; Step S8: Repeat steps S5 to S7 until the installation clearance meets the CN group standard clearance requirements; Step S9: Remove the hex head bolts, socket head cap screws, and HML locknuts.

[0014] Furthermore, after step S9, the bearing enters normal working condition. The HML locking nut and related fasteners are removed to avoid interference with other components of the housing, and to prevent the bearing from loosening due to vibration during operation and failing prematurely.

[0015] Furthermore, the bearing is used for crankshaft support at both ends of the diaphragm pump crankshaft.

[0016] Furthermore, the bearing adopts a thin oil bath lubrication method, and the lubricating oil is 320 industrial gear oil.

[0017] The present invention has the following beneficial effects: 1) Achieved precise bidirectional adjustment of installation clearance. The clearance is reduced by pressing in with a hydraulic press and increased by withdrawing in the opposite direction using a hexagonal head bolt. The combination of these two methods allows for precise adjustment of the installation clearance to the CN group standard value. (2) Significantly improved on-site installation efficiency. No need for repeated bearing disassembly and reassembly; excessively small installation clearance can be corrected simply by fine-tuning the bolts, greatly shortening installation time. (3) Simple structure and low modification cost. By using HML lock nuts, hexagonal head bolts, AOH release sleeves, and innovative designs based on HML lock nuts, multiple bolt holes are added for adjusting clearance, and slots are added for fastening, the adjustment function can be realized without special processing of the bearing body; (4) Improved installation reliability. The HML lock nut is locked by an internal hexagonal head screw, ensuring that the ejection sleeve system remains stable and does not move during the process of multiple bolts pushing the bearing, thus guaranteeing installation accuracy. Attached Figure Description

[0018] Figure 1 This is an overall structural diagram of the present invention.

[0019] Figure 2 for Figure 1 Cross-sectional view.

[0020] Figure 3 for Figure 1 A partial structural diagram (showing the fit between the hexagonal head bolt and the inner ring).

[0021] Figure 4 for Figure 3 Another perspective on the structure (inner circle omitted).

[0022] Figure 5 for Figure 1 The diagram shows the connection structure of the HML lock nut, hexagonal head bolt, and internal hexagonal head screw.

[0023] Figure 6 for Figure 1 The structural diagram of the HML locking nut.

[0024] Figure 7 for Figure 1 The structural diagram of the AOH unloading sleeve in the image.

[0025] In the diagram, 1. Outer ring, 2. Inner ring, 3. Roller, 4. Cage, 5. AOH release sleeve, 6. HML lock nut, 6.1. Threaded hole, 7. Socket head cap screw, 7.1. Locking bolt hole, 8. Hex head bolt. Detailed Implementation

[0026] To make the structure and function of the present invention clearer, the technical solutions in the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0027] like Figure 1-7 As shown, this invention provides a self-aligning roller bearing with adjustable installation clearance, comprising an outer ring 1, an inner ring 2, rollers 3, a cage 4, an AOH withdrawal sleeve 5, an HML lock nut 6, a hexagon socket head cap screw 7, and a hexagon head bolt 8. The inner ring 2 has a tapered bore structure and mates with the AOH withdrawal sleeve 5 for installation. The rollers 3 are arranged in a double row, and the relative positions of the rollers 3 are maintained by the cage 4. The outer ring 1 is fitted over the rollers 3. This bearing is used at both ends of the crankshaft of a diaphragm pump for crankshaft support. The bearing uses a thin oil bath lubrication method, with 320 industrial gear oil as the lubricant.

[0028] The AOH withdrawal sleeve 5 is installed at both ends of the crankshaft, and its outer surface is tapered, which mates with the tapered hole of the inner ring 2. The function of the AOH withdrawal sleeve 5 is to provide an adjustable tapered fit between the crankshaft and the bearing inner ring 2, and to change the bearing installation clearance by changing the amount of pressing.

[0029] The HML locking nut 6 is threadedly connected to the end of the AOH release sleeve 5. The HML locking nut 6 has an axially penetrating threaded hole 6.1 for installing a hexagonal head bolt 8. At the same time, the internal thread of the HML locking nut 6 mates with the external thread of the AOH release sleeve 5, and axial positioning is achieved by tightening.

[0030] A locking groove is provided at any point on the outer diameter of the HML locking nut 6. The locking groove of the HML locking nut 6 divides the HML locking nut 6 into two nut walls. Correspondingly, locking bolt holes 7.1 are provided on the two nut walls for the internal hexagonal head screws 7 to pass through. The screw of the internal hexagonal head screw 7 passes through the two locking bolt holes 7.1, so that the HML locking nut 6 is tightly fitted and locked with the threads of the AOH release sleeve 5, preventing the HML locking nut 6 from axially moving during the process of the 8 bolts pushing the bearing.

[0031] The principle of HML locking nut 6 and AOH release sleeve 5 locking: When the socket head cap screw 7 is tightened, the nut walls on both sides of the locking groove move closer together, causing the HML locking nut 6 to deform axially as a whole. This results in a locking fit between the internal thread of the HML locking nut 6 and the external thread of the AOH release sleeve 5—that is, the threaded pair is locked due to deformation. Conversely, when the socket head cap screw 7 is loosened, the axial deformation of the HML locking nut 6 is released.

[0032] Eight hexagonal head bolts 8 are evenly distributed along the circumference of the HML lock nut 6. Each hexagonal head bolt 8 is screwed into the axial threaded hole 6.1 on the HML lock nut 6. When tightened, the end of its screw pushes against the end face of the inner ring 2. When the screw of the hexagonal head bolt 8 is in contact with the end face of the bearing inner ring, the position of the center line of the screw of the hexagonal head bolt 8 to the end face of the bearing inner ring is slightly lower than the position of the bearing inner ring raceway. This avoids damage to the inner ring retaining edge when disassembling or adjusting the clearance. By evenly tightening the eight hexagonal head bolts 8, the inner ring 2 can be slightly removed from the AOH withdrawal sleeve 5, thereby increasing the bearing installation clearance.

[0033] The outer ring 1, inner ring 2, roller 3, and cage 4 constitute a standard double-row self-aligning roller bearing.

[0034] The installation and clearance adjustment steps of the bearing of this invention are as follows: Step 1: Install the AOH withdrawal sleeve 5 at both ends of the crankshaft, ensuring that the withdrawal sleeve 5 fits well with the crankshaft journal.

[0035] Step 2: Screw the HML locking nut 6 into the threaded end of the AOH release sleeve 5 and tighten it initially.

[0036] Step 3: Screw the hex socket head cap screw 7 into the HML lock nut 6. The HML lock nut 6 is secured in place by its tight thread engagement with the AOH withdrawal sleeve 5, preventing any movement. This step is crucial, as it ensures the stability of the entire withdrawal sleeve system when the subsequent eight bolts push the bearing.

[0037] Step 4: Install the standard double-row self-aligning roller bearing with tapered inner ring using the press-fit method (including outer ring 1, inner ring 2, rollers 3, and cage 4). Use a hydraulic loading and unloading press to press the bearing into the AOH withdrawal sleeve 5. The hydraulic press provides controllable axial pressure to press the bearing inner ring 5 along the tapered surface of the withdrawal sleeve 5.

[0038] Step 5: Use a feeler gauge to check the bearing installation clearance. Insert the feeler gauge between the outer ring 1 and the roller 3 to measure the radial clearance value.

[0039] Step 6: When the detected installation clearance is larger than the standard clearance of group CN, the hydraulic loading and unloading press continues to press the bearing into the AOH withdrawal sleeve 5. As the pressing amount increases, the axial displacement of the inner ring 2 on the conical surface of the withdrawal sleeve 5 increases, and the installation clearance of the bearing decreases accordingly.

[0040] Step 7: Use a feeler gauge again to check the bearing installation clearance.

[0041] Step 8: When the detected installation clearance is smaller than the CN group standard clearance, screw in eight evenly distributed hexagonal head bolts 8 along the circumference of the HML lock nut 6. As the hexagonal head bolts 8 are screwed in, their screw ends gradually push against the end face of the inner ring 2, generating an axial force that pulls the inner ring 2 off the AOH ejector sleeve 5. Because the eight bolts 8 are evenly distributed, the inner ring 2 is subjected to uniform force and can be smoothly and slightly withdrawn, thereby increasing the installation clearance. It should be noted that the position of the hexagonal head bolt screw centerline to the end face of the bearing inner ring is slightly lower than the position of the bearing inner ring raceway, thus avoiding damage to the inner ring flange during disassembly or clearance adjustment.

[0042] Step 9: Use a feeler gauge again to check the bearing installation clearance.

[0043] Step 10: Repeat steps 6 to 9, that is, alternate between using hydraulic pressing and bolt removal, until the installation clearance measured by the feeler gauge meets the clearance requirements of the CN group standard.

[0044] Step 11: After the clearance adjustment is satisfactory, remove the 8 evenly distributed hexagonal head bolts.

[0045] Step 12: Remove the internal hex socket head cap screws 7.

[0046] Step 13: Remove HML lock nut 6.

[0047] It should be noted that steps eleven through thirteen aim to prevent the HML locknut 6, socket head cap screw 7, and hex head bolt 8 from interfering with other components of the housing. Furthermore, if these fasteners are not removed, they may loosen due to vibration during bearing operation, leading to premature bearing failure. After removal, the bearing is directly secured to the crankshaft using the AOH withdrawal sleeve 5, resulting in a simple and reliable structure.

[0048] The core innovation of this invention lies in providing a two-way adjustment capability for bearing installation—both "press-in" and "removal"—by adding HML locking nuts 6 and evenly distributed hexagonal head bolts 8. The hydraulic press presses the bearing into the withdrawal sleeve to reduce clearance, while the hexagonal head bolts 8 slightly remove the bearing to increase clearance. Using a feeler gauge in conjunction, the installation clearance can be precisely adjusted to the CN group standard value. This method completely solves the technical problem of traditional unidirectional press-fitting failing to correct "overpressure."

[0049] It should be noted that the parts of this invention not described in detail are prior art.

[0050] The above examples are merely preferred 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 conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A self-aligning roller bearing with adjustable installation clearance, characterized in that, include: The crankshaft comprises an outer ring, an inner ring, rollers, a cage, an AOH (outlet cap) release sleeve, an HML (lock nut), hexagon socket head cap screws, and hexagon head bolts. The AOH release sleeve is installed at both ends of the crankshaft. The HML lock nut is threaded onto the AOH release sleeve. The hexagon socket head cap screws are screwed into the HML lock nut to ensure a tight fit between the HML lock nut and the threads of the AOH release sleeve, thus securing the HML lock nut. The inner ring has a tapered hole, which mates with the tapered surface of the AOH release sleeve for installation. Multiple hexagon head bolts are evenly distributed on the HML lock nut.

2. The self-aligning roller bearing with adjustable installation clearance according to claim 1, characterized in that: When the hexagonal head bolt's shank pushes against the inner ring end face of the bearing, the position of the hexagonal head bolt's shank centerline to the inner ring end face of the bearing is slightly lower than the position of the bearing's inner ring raceway.

3. The self-aligning roller bearing with adjustable installation clearance according to claim 1, characterized in that: The bearing's installation clearance is the CN group standard clearance. When the installation clearance is greater than the CN group standard clearance, the inner ring is pressed into the AOH withdrawal sleeve by a hydraulic press to reduce the installation clearance. When the installation clearance is less than the CN group standard clearance, the inner ring end face is pushed by screwing in the hexagonal head bolt to increase the installation clearance until the installation clearance meets the CN group standard clearance.

4. A self-aligning roller bearing with adjustable installation clearance according to claim 1, characterized in that: The number of hexagonal head bolts is 8, which are evenly distributed along the circumference of the HML lock nut.

5. A self-aligning roller bearing with adjustable installation clearance according to claim 4, characterized in that: The HML locking nut is provided with a threaded hole that mates with the hexagonal head bolt, and the threaded hole is provided to pass through the HML locking nut along its axial direction.

6. A self-aligning roller bearing with adjustable installation clearance according to claim 1, characterized in that: The outer ring, inner ring, rollers, and cage are configured as a standard double-row self-aligning roller bearing, wherein the taper of the inner ring bore matches the taper of the outer tapered surface of the AOH ejector sleeve.

7. A self-aligning roller bearing with adjustable installation clearance according to claim 6, characterized in that: The bearing is used to support the crankshaft at both ends of the diaphragm pump crankshaft.

8. A self-aligning roller bearing with adjustable installation clearance according to claim 6, characterized in that: The bearing is lubricated by a thin oil bath.

9. A self-aligning roller bearing with adjustable installation clearance according to claim 6, characterized in that: The bearing is lubricated with 320 industrial gear oil.

10. A method for adjusting the installation clearance of a self-aligning roller bearing, used to adjust the installation clearance of the self-aligning roller bearing with adjustable installation clearance as described in any one of claims 1 to 9, characterized in that, Includes the following steps: Step S1: Install the AOH removal sleeves at both ends of the crankshaft; Step S2: Tighten the HML locking nut into the AOH release sleeve; Step S3: Screw the internal hex socket head cap screw into the HML lock nut, so that the HML lock nut and the AOH release sleeve thread fit tightly together, ensuring that the HML lock nut is fixed and does not move. Step S4: Install the double-row self-aligning roller bearing with tapered bore on the inner ring using the press-fit method. Use a hydraulic press to press the bearing into the AOH ejection sleeve. Step S5: Use a feeler gauge to check the bearing's installation clearance; Step S6: When the installation clearance is greater than the standard clearance of group CN, use a hydraulic press to continue pressing the bearing into the AOH withdrawal sleeve to reduce the installation clearance; Step S7: When the installation clearance is less than the standard clearance of CN group, screw in the evenly distributed hexagonal head bolts, and push the inner ring end face through the screw to make the bearing slightly withdraw from the AOH ejection sleeve, thereby increasing the installation clearance; Step S8: Repeat steps S5 to S7 until the installation clearance meets the CN group standard clearance requirements; Step S9: Remove the hex head bolts, socket head cap screws, and HML locknuts.

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