Tool for installing self-aligning bearing

Abstract

The utility model belongs to the technical field of work fixture machinery, and relates to a tool for installing a self-aligning bearing. The tool comprises a pressing ring, a special nut and a jackscrew. The pressing ring is in a circular ring shape. The inner diameter of the pressing ring is larger than the inner diameter of an inner ring of the self-aligning bearing, and the outer diameter of the pressing ring is smaller than the inner diameter of an outer ring of the self-aligning bearing. A plurality of outer spigots are uniformly distributed on one end surface of the pressing ring; an inner ring of the special nut is a threaded through hole which is used for being connected with the threaded section of the bearing adapter sleeve in a matched mode. A plurality of inner spigots are uniformly distributed on one end surface of the special nut; the number of the inner spigots is the same as that of the outer spigots, and the inner spigots are matched and connected with the outer spigots; a jackscrew hole is formed in the special nut in the depth direction of the female end, one end of the jackscrew hole is communicated with the female end, and the other end of the jackscrew hole penetrates through the special nut. The jackscrew is used for pushing the pressing ring after being in threaded fit with the jackscrew hole; the thickness of the pressing ring is larger than the distance between the self-aligning bearing and the threaded section of the bearing adapter sleeve. According to the utility model, the installation steps of the self-aligning bearing are simplified, and the working efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of fixture machinery and relates to a tool for installing a self-aligning bearing. Background Art

[0002] As a key component in mechanical transmission systems, bearings fulfill the crucial tasks of supporting rotating parts, reducing friction during motion, and ensuring rotational accuracy. Bearing operating clearance, or the amount of clearance within a bearing during operation, has a crucial impact on its performance and lifespan. It directly impacts multiple aspects of the bearing, including load distribution, vibration, noise, frictional torque, and service life.

[0003] The traditional method of assembling large spherical bearings is to use a hydraulic nut in conjunction with an ultra-high-pressure oil pump. This method applies pressure to the hydraulic nut, causing the hydraulic oil supplied by the high-pressure oil pump to push the piston, generating an axial force that drives the inner ring of the bearing axially to the desired position. However, this method has some significant limitations. First, the bore diameter of hydraulic nuts is mostly over 50mm, making them unsuitable for spherical bearings with inner bores smaller than 50mm. Second, the operation of the hydraulic system is relatively complex, requiring specialized equipment and skills, and is costly.

[0004] For self-aligning bearings with an inner diameter less than 50mm, the current market solutions are incomplete due to the inability to use hydraulic devices for assembly. According to CN201510580699.8, specialized tooling equipment is often lacking for these small bearings. During the actual assembly process, assemblers often rely on experience and visual inspection to position the bearings and secure them by tightening the bearing adapter sleeve nuts. The disadvantage of this method is obvious: it cannot accurately control the operating clearance of the bearing, resulting in the inability to guarantee the radial clearance dimensional accuracy of the bearing.

[0005] Excessive radial clearance will reduce the bearing's internal load-bearing area and increase the stress on the contact surface, thereby shortening the bearing's service life, reducing the bearing's motion accuracy, and increasing vibration and noise. Excessive radial clearance may lead to negative clearance, that is, the clearance inside the bearing is too small or even disappears, which will cause increased friction and heat generation in the bearing, further reducing the bearing's working clearance or increasing the interference fit, forming a vicious cycle and ultimately leading to bearing locking. Utility Model Content

[0006] In order to solve the problems existing in the prior art, the utility model provides a tool for installing a self-aligning bearing.

[0007] In order to achieve the above purpose, the solution adopted by the utility model is as follows:

[0008] A tool for installing a self-aligning bearing is used to install the self-aligning bearing. The self-aligning bearing is sleeved on a bearing adapter sleeve, and the bearing adapter sleeve is sleeved on a shaft. The tool for installing the self-aligning bearing includes a pressure ring, a special nut and a jackscrew;

[0009] The pressure ring is annular; the inner diameter of the pressure ring is larger than the inner diameter of the inner ring of the self-aligning bearing, and the outer diameter of the pressure ring is smaller than the inner diameter of the outer ring of the self-aligning bearing; a plurality of outer stops are evenly distributed on one end surface of the pressure ring;

[0010] The inner ring of the special nut is a threaded through hole, which is used to cooperate with the threaded section of the bearing adapter sleeve; one end face of the special nut is evenly distributed with multiple inner stoppers; the number of the inner stoppers is the same as the outer stoppers, and they are used to cooperate with the outer stoppers;

[0011] Along the depth direction of the inner stop, a top screw hole is provided on the special nut, one end of the top screw hole is connected to the inner stop, and the other end passes through the special nut; the top screw is used to push the pressure ring after matching with the top screw hole thread;

[0012] Along the length direction of the shaft, the thickness of the pressure ring is greater than the distance between the thread sections of the self-aligning bearing and the bearing adapter sleeve.

[0013] As the preferred technical solution:

[0014] In the tool for installing a self-aligning bearing as described above, the inner diameter of the pressure ring is 1 mm larger than the inner diameter of the inner ring of the self-aligning bearing, that is, slightly larger than the inner diameter of the inner ring of the bearing.

[0015] The tool for installing a self-aligning bearing as described above has three or more top screw holes.

[0016] In the tool for installing a self-aligning bearing as described above, the thickness of the special nut is smaller than the length of the threaded section of the bearing adapter sleeve, and the difference is greater than or equal to 10 mm. If the thickness of the special nut is too thick and greater than the length of the threaded section of the bearing adapter sleeve, there will be an area in the through hole of the special nut that does not contact the threaded section of the bearing adapter sleeve, which is easy to slip, making it difficult to tighten the pressure ring with the jackscrew.

[0017] In the tool for installing a self-aligning bearing as described above, the hand-tightening portion of the special nut is provided with anti-slip grooves.

[0018] As described above, in a tool for installing a self-aligning bearing, the ratio of the length of the outer stop of the pressure ring to the thickness of the special nut is 1:5, that is, the ratio of the fitting length of the inner stop fitting connection to the thickness of the special nut is 1:5. If the fitting section is too short, the deformation under load will be greater; if the fitting section is too long, the working length of the top screw will be shorter, and the top screw will easily slip and fail to eject the pressure ring; and if the effective fitting section is too long, the assembly difficulty will increase, and higher requirements will be placed on the form and position tolerances.

[0019] The tool for installing a self-aligning bearing as described above comprises a pressure ring made of 45# steel with a hardness of HRC55 to HRC58; a special nut made of 45# steel with a hardness of HRC55 to HRC58; and a top screw made of M6 black hexagonal bolt.

[0020] Beneficial effects:

[0021] The utility model abandons the cumbersome assembly process of the traditional hydraulic device, adopts the combination of the pressure ring, the special nut and the top screw, directly simplifies the installation steps of the self-aligning bearing, and improves the work efficiency.

[0022] Compared with complex hydraulic devices, the utility model has a simple structure and low manufacturing cost. At the same time, it reduces the technical requirements for operators, making the assembly process easier to use, thereby reducing the overall assembly cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the relative positions of the tool for installing a self-aligning bearing, the self-aligning bearing, the bearing adapter sleeve, and the bearing when installing the self-aligning bearing;

[0024] Figure 2 This is a schematic diagram of the structure of the pressure ring of the tool for installing the self-aligning bearing of the utility model; wherein, Figure 2 a is the main view, b is the side sectional view;

[0025] Figure 3 This is a schematic diagram of the structure of a special nut for the tool for installing a self-aligning bearing according to the present invention; wherein, Figure 3 a is the main view, b is the side sectional view;

[0026] Figure 4 This is a schematic diagram of the structure of the tool for installing the self-aligning bearing of the utility model after the pressure ring and the special nut are assembled; wherein, Figure 4 a is the main view, b is the side sectional view;

[0027] Figure 5 This is a schematic diagram of the relative positions of the self-aligning bearing, the bearing adapter sleeve, the locking washer, and the locking nut after the self-aligning bearing is installed;

[0028] Among them, 1-pressure ring, 3-external stop, 4-special nut, 5-internal stop, 6-threaded through hole, 7-bearing adapter sleeve, 8-spherical bearing, 9-top screw, 10-locking washer, 11-locking nut. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present invention and are not intended to limit the scope of the present invention. It should also be understood that after reading the contents of the present invention, those skilled in the art may make various changes or modifications to the present invention, and that these equivalent forms also fall within the scope defined by the appended claims.

[0030] A tool for installing spherical bearings, such as Figure 1 、 Figure 5 As shown, it is used to install the self-aligning bearing 8, the self-aligning bearing 8 is sleeved on the bearing adapter sleeve 7, and the bearing adapter sleeve 7 is sleeved on the shaft;

[0031] like Figures 1 to 4 As shown, the tools for installing the self-aligning bearing include a pressure ring 1, a special nut 4 and a top screw 9;

[0032] like Figure 2 、 Figure 4 As shown, the pressure ring 1 is an annular pressure ring made of 45# steel with a hardness of HRC55 to HRC58. One end surface of the pressure ring 1 has four outer stops 3 evenly distributed.

[0033] The inner diameter of the pressure ring 1 is 1 mm larger than the inner diameter of the inner ring of the self-aligning bearing 8, and the outer diameter of the pressure ring 1 is smaller than the inner diameter of the outer ring of the self-aligning bearing 8; along the length direction of the shaft, the thickness of the pressure ring 1 is greater than the distance between the threaded sections of the self-aligning bearing 8 and the bearing adapter sleeve 7;

[0034] like Figure 3 、 Figure 4 As shown, the special nut 4 is made of 45# steel with a hardness of HRC55-HRC58. The hand-tightening part of the special nut 4 is provided with anti-slip grooves. The inner ring of the special nut 4 is a threaded through hole 6, which is used to cooperate with the threaded section of the bearing adapter sleeve 7.

[0035] A plurality of inner stoppers 5 are evenly distributed on one end surface of the special nut 4; the number of the inner stoppers 5 is the same as that of the outer stoppers 3, and the inner stoppers 5 are used to cooperate with the outer stoppers 3 for connection;

[0036] The thickness of the special nut 4 is smaller than the length of the threaded section of the bearing adapter sleeve 7, and the difference is greater than or equal to 10 mm. The thickness of the special nut 4 and the length of the outer stop 3 of the pressure ring 1 are 5:1;

[0037] Along the depth direction of the inner stop 5, a top screw hole is provided on the special nut 4, one end of the top screw hole is connected to the inner stop 5, and the other end passes through the special nut 4;

[0038] like Figure 1 As shown, the top screw 9 is an M6 black hexagonal bolt, which is used to push the pressure ring 1 after being matched with the top screw hole thread.

[0039] like Figure 1 As shown, when installing a self-aligning bearing 8 using the self-aligning bearing installation tool, first ensure that the bearing adapter sleeve 7 is accurately and securely positioned on the shaft and fits snugly against the shaft surface. Next, insert the self-aligning bearing 8 onto the bearing adapter sleeve 7, ensuring that the self-aligning bearing 8 also fits snugly against the outer surface of the bearing adapter sleeve 7. Next, mate the pressure ring 1 with the dedicated nut 4, precisely aligning the outer stop 3 of the pressure ring 1 with the inner stop 5 of the dedicated nut 4 to ensure there is no looseness between them.

[0040] Afterwards, the threaded through hole 6 of the special nut 4 is tightly matched with the threaded section of the bearing adapter sleeve 7, and the special nut 4 is rotated to make it firmly connected to the bearing adapter sleeve 7, and ensure that the pressure ring 1 is close to the inner ring of the self-aligning bearing 8.

[0041] Subsequently, use the jackscrew 9 to threadably engage the jackscrew hole on the special nut 4. By rotating the jackscrew 9, the pressure ring 1 is pushed inward until the pressure ring 1 presses against the inner ring of the self-aligning bearing 8, bringing the radial clearance of the self-aligning bearing 8 within the specified range. To confirm whether the radial clearance is qualified, it is necessary to refer to the bearing clearance standard table to find the theoretical maximum and minimum radial clearance of the self-aligning bearing 8. Then, use a feeler gauge to measure the actual maximum and minimum radial clearance. The arithmetic average of these two measured values ​​is taken as the radial clearance value of the bearing and compared with the standard range. Once the radial clearance is confirmed to meet the requirements, the special nut 4 can be unscrewed and the pressure ring 1 can be carefully removed from the shaft.

[0042] Then, if Figure 5 As shown, replace the lock washer 10 and lock nut 11 (the lock washer 10 and lock nut 11 are matching parts included with the bearing adapter sleeve 7) and tighten the lock nut 11 to ensure it is firmly fixed to the bearing adapter sleeve 7. Finally, bend one of the claws of the lock washer 10 and snap it into the corresponding opening of the lock nut 11 to complete the final locking and fixation. At this point, the installation process of the self-aligning bearing is complete.

Claims

1. A tool for installing a self-aligning bearing, used for installing a self-aligning bearing, wherein the self-aligning bearing (8) is sleeved on a bearing adapter sleeve (7), and the bearing adapter sleeve (7) is sleeved on a shaft, characterized in that: The tool for installing the self-aligning bearing includes a pressure ring (1), a special nut (4) and a top screw; The pressure ring (1) is annular; the inner diameter of the pressure ring (1) is larger than the inner diameter of the inner ring of the self-aligning bearing (8), and the outer diameter of the pressure ring (1) is smaller than the inner diameter of the outer ring of the self-aligning bearing (8); a plurality of outer stoppers (3) are evenly distributed on one end surface of the pressure ring (1); The inner ring of the special nut (4) is a threaded through hole (6), and the threaded through hole (6) is used to cooperate with the threaded section of the bearing adapter sleeve (7); a plurality of inner stoppers (5) are evenly distributed on one end surface of the special nut (4); the number of the inner stoppers (5) is the same as that of the outer stoppers (3), and the inner stoppers (5) are used to cooperate with the outer stoppers (3); Along the depth direction of the inner stop (5), a top screw hole is provided on the special nut (4), one end of the top screw hole is connected to the inner stop (5), and the other end passes through the special nut (4); the top screw is used to push the pressure ring (1) after being matched with the thread of the top screw hole; Along the longitudinal direction of the shaft, the thickness of the pressure ring (1) is greater than the distance between the threaded sections of the self-aligning bearing (8) and the bearing adapter sleeve (7).

2. A tool for installing a self-aligning bearing according to claim 1, characterized in that: The inner diameter of the pressure ring (1) is 1 mm larger than the inner diameter of the inner ring of the self-aligning bearing.

3. A tool for installing a self-aligning bearing according to claim 1, characterized in that: The number of top screw holes is 3 or more.

4. A tool for installing a self-aligning bearing according to claim 1, characterized in that: The thickness of the special nut (4) is smaller than the length of the threaded section of the bearing adapter sleeve (7), and the difference is greater than or equal to 10 mm.

5. A tool for installing a self-aligning bearing according to claim 4, characterized in that: The hand-tightening portion of the special nut (4) is provided with anti-slip lines.

6. A tool for installing a self-aligning bearing according to claim 1, characterized in that: The ratio of the length of the outer stop (3) of the pressure ring (1) to the thickness of the special nut (4) is 1:5.

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