A bearing locking structure

Abstract

The present application provides a bearing locking structure, comprising: a rotating shaft, on which a radial protrusion is provided, and a smooth section and a threaded section are provided in sequence from the radial protrusion to the side where the bearing is installed, and an anti-rotation pin hole is provided on the threaded section; a bearing, which is installed on the smooth section and axially limited by the radial protrusion, and the side of the inner ring of the bearing away from the radial protrusion has an inner ring groove; a clamping nut, which is installed on the threaded section of the rotating shaft and is used to axially lock the bearing, and the side of the clamping nut facing the bearing has a nut groove; an anti-rotation pin, which is installed in the anti-rotation pin hole of the rotating shaft and is simultaneously located in the groove formed by the inner ring groove and the nut groove to prevent the inner ring of the bearing and / or the clamping nut from rotating; and a self-locking elastic ring, which has a locking plate on one side and an elastic locking plate on the other side. When the self-locking elastic ring is installed on the clamping nut, the elastic locking plate can provide elastic pressure to the anti-rotation pin to prevent the anti-rotation pin from falling off, and the self-locking elastic ring can be limited on the clamping nut by bending the locking plate.

Description

Technical Field

[0001] The present application belongs to the field of mechanical transmission technology, and in particular relates to a bearing locking structure. Background Art

[0002] The problem of fixing and locking the inner ring of the bearing is a common problem in high-speed rotating machinery or devices. Since high-speed rotating machinery is often affected by dynamic loads during operation (such as aircraft engine imbalance, which induces structural vibration, bearing drag torque, and increased structural resistance), it is very easy to induce looseness or even fatigue. If the cylindrical surface where the inner ring of the bearing contacts the rotating shaft has insufficient interference, it is more likely to cause the inner ring of the bearing to rotate relative to the shaft during operation, thereby causing friction and wear failure of the structure.

[0003] like Figure 1 and Figure 2 Schematic diagrams of two typical bearing inner ring locking structures. Figure 1 In the typical bearing inner ring locking structure 10 shown in FIG. 1 , the locking method mainly relies on the interference fit of the inner ring 12 and the pre-tightening force of the nut 13. Under the influence of large working loads and vibrations, the bearing inner ring 12 is inevitably worn by rotating relative to the shaft 11. Figure 2 In the typical bearing inner ring locking structure 20 shown, a groove 23 is provided on the bearing inner ring 22, and a pin 24 is inserted into the rotating shaft 21 and the groove 23. Although the pin 24 can prevent the bearing inner ring 22 and the rotating shaft 21 from rotating relative to each other, the groove 23 on the bearing inner ring 3 is prone to cause greater stress concentration, resulting in fatigue damage to the structure.

[0004] In order to improve the above problems, a new bearing locking structure is needed. Summary of the invention

[0005] The purpose of the present application is to provide a bearing locking structure to solve or alleviate at least one problem in the background technology.

[0006] The technical solution of the present application is: a bearing locking structure, comprising:

[0007] A rotating shaft, wherein a radial protrusion is provided on the rotating shaft, and a smooth section and a threaded section are provided in sequence from the radial protrusion to the bearing installation side, and an anti-rotation pin hole is provided on the threaded section;

[0008] A bearing, the bearing being mounted on the smooth section of the rotating shaft and being directly or indirectly axially limited by the radial protrusion, the bearing having a bearing inner ring, and the side of the bearing inner ring away from the radial protrusion having an inner ring groove adapted to the size of the anti-rotation pin;

[0009] A clamping nut, which is mounted on the threaded section of the rotating shaft and is used to axially lock the bearing. The side of the clamping nut facing the bearing has a nut groove adapted to the size of the anti-rotation pin;

[0010] An anti-rotation pin, which is installed in the anti-rotation pin hole of the rotating shaft and is also located in the groove formed by the inner ring groove and the nut groove to prevent the bearing inner ring and / or the clamping nut from rotating; and

[0011] A self-locking elastic ring has a locking plate on one side and an elastic locking plate on the other side. When the self-locking elastic ring is installed on the clamping nut, the elastic locking plate can provide elastic pressure to the anti-rotation pin to prevent the anti-rotation pin from falling off. The self-locking elastic ring is limited on the clamping nut by bending the locking plate.

[0012] Furthermore, the bearing locking structure also includes a distance sleeve, which is installed on the smooth section of the rotating shaft and is located between the radial protrusion and the inner ring of the bearing.

[0013] Furthermore, the distance sleeve and the rotating shaft are clearance-matched, and the clearance is no greater than 0.05 mm.

[0014] Furthermore, the length of the smooth section is adapted to the sum of the lengths of the distance sleeve and the inner ring of the bearing.

[0015] Furthermore, the bearing is a bearing having rolling elements.

[0016] Furthermore, the inner ring groove on the inner ring of the bearing and the nut groove on the clamping nut are symmetrical in structure.

[0017] Furthermore, there are multiple inner ring grooves on the bearing inner ring and / or multiple nut grooves on the clamping nut.

[0018] Furthermore, the elastic locking piece of the self-locking elastic ring is bent to form an inclined surface, and the minimum size of the inclined surface is smaller than the height of the anti-rotation pin installed on the rotating shaft.

[0019] Furthermore, there are unloading grooves between the elastic locking pieces of the self-locking elastic ring.

[0020] Furthermore, the self-locking elastic ring is made of elastic metal material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solution provided by the present application, the following is a brief introduction to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present application.

[0022] Figure 1 It is a schematic diagram of a typical bearing inner ring locking structure in the prior art.

[0023] Figure 2 This is another typical schematic diagram of a bearing inner ring locking structure in the prior art.

[0024] Figure 3 This is a schematic diagram of the bearing locking structure of the present application.

[0025] Figure 4 This is a schematic diagram of the right inner ring of the bearing in this application.

[0026] Figure 5 Schematic diagram of the self-locking elastic ring in this application.

[0027] Figure 6 Schematic diagram of the compression nut in this application.

[0028] Figure 7 Schematic diagram of the rotating shaft in this application.

[0029] Figure 8 This is a schematic diagram of the anti-rotation pin in this application. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solutions and advantages of the implementation of this application clearer, the technical solutions in the embodiments of this application will be described in more detail below in conjunction with the drawings in the embodiments of this application.

[0031] In order to solve the problems of unreliable structure, weak functional retention and complex assembly of bearing locking devices in the prior art, reduce the impact of friction and wear loads, reduce the stress level at local stress concentration points, achieve reliability of the working process and reduce maintenance costs, the present application provides a new type of bearing locking structure that can be used for the assembly and locking of high-speed rotating mechanical bearings.

[0032] like Figure 3 As shown, the novel bearing locking structure is described by taking a typical bearing inner ring locking structure in the prior art as an example, without further elaborating on another typical bearing inner ring locking structure.

[0033] The novel bearing locking structure 30 mainly includes a rotating shaft 31 , a distance sleeve 32 , a bearing 33 , a pressing nut 34 , a self-locking elastic ring 35 and an anti-rotation pin 36 .

[0034] like Figure 4As shown, the middle part of the rotating shaft 31 has a radial protrusion 313, the right side of the radial protrusion 313 is a smooth section, the right side of the smooth section is a threaded section 311, and the threaded section 311 has an anti-rotation pin hole 312. The distance sleeve 32 is assembled on the smooth section of the rotating shaft 31, and the left side is limited by the radial protrusion 313 of the rotating shaft 31. In the preferred embodiment of the present application, the distance sleeve 332 is assembled to the rotating shaft 31 in a small clearance matching manner, and the small clearance usually refers to a small matching clearance, that is, the matching tolerance is smaller than the common tolerance of the shaft hole matching, which can usually be set to 1 to 2 threads (1 thread is 0.01 mm) of clearance, and the maximum does not exceed 5 threads.

[0035] The bearing 33 is assembled on the smooth section of the rotating shaft 31, and the left side of its inner ring contacts the right side of the spacer sleeve 32. An inner ring groove 336 is provided on the right end face of the inner ring of the bearing. In this embodiment, the bearing 33 is a ball bearing, which includes a bearing outer ring 331, a retainer 332, a rolling element 333, a bearing left inner ring 334 and a bearing right inner ring 335. The inner ring groove 336 is provided on the right end face of the bearing right inner ring 335. It can be understood that the bearing 33 can also be other types of bearings, such as a cylindrical roller bearing, etc. Figure 5 As shown, in the preferred embodiment of the present application, the inner ring groove 336 is a semicircular groove to match the anti-rotation pin 36 .

[0036] like Figure 6 As shown, the compression nut 34 has a thread structure 341 inside, and a nut groove 342 is provided on the side of the compression nut 34 facing the bearing 33, and the nut groove 342 is matched with the inner ring groove 336, so as to form a mounting hole of the anti-rotation pin 36 for assembling the anti-rotation pin 10. It can be understood that the shape of the nut groove 342 is usually symmetrical with the inner ring groove 336, and when the inner ring groove 336 is a semicircular groove, the nut groove 342 is also a semicircular groove.

[0037] like Figure 7 As shown, the anti-rotation pin 36 is installed in the installation hole formed by the inner ring groove 336 of the right inner ring 335 of the bearing and the nut groove 342 of the clamping nut 34, and is inserted into the anti-rotation pin hole 312 of the rotating shaft 31. It should be noted that in order to ensure that the anti-rotation pin 36 falls into the inner ring groove 336 of the right inner ring 335 of the bearing and the nut groove 342 of the clamping nut 34, one or both of the inner ring groove 336 of the right inner ring 335 of the bearing and the nut groove 342 of the clamping nut 34 can be provided with multiple grooves.

[0038] like Figure 8As shown, the main body of the self-locking elastic ring 35 is a relatively thick structure. A locking piece 352 is arranged on the left side of the main structure. The thickness of the locking piece 352 is much smaller than the thickness of the main structure, which is approximately 1 mm to 2 mm. An elastic locking piece 351 is arranged on the right side of the main structure. The elastic locking piece 351 is formed by bending a relatively long sheet structure. The inner side surface after bending is approximately an inclined surface. The minimum part of the inclined surface is smaller than the height of the anti-rotation pin 36 installed on the rotating shaft 31. Therefore, after the main structure of the self-locking elastic ring 35 is matched with the clamping nut 34 and installed, the inclined surface of the elastic locking piece 351 can provide elastic pressure to the anti-rotation pin 36 installed on the rotating shaft 1, thereby at least partially covering the anti-rotation pin 10 to prevent the anti-rotation pin 10 from popping out or falling off. In order to provide elastic pressure to the anti-rotation pin 10 stably for a long time, the self-locking elastic ring 35 is preferably made of elastic metal material, such as spring steel.

[0039] Furthermore, an annular loading edge 353 is provided on the outer side of the main body of the self-locking elastic ring 35 , and the axial installation and removal of the self-locking elastic ring 35 are realized through the annular protrusion 353 .

[0040] When in use, the distance sleeve 32 is installed on the smooth section of the rotating shaft 31 by a small clearance fit, and the bearing 33 is assembled on the rotating shaft 31 by an interference fit (the left inner ring 334 and the right inner ring 335 of the bearing are assembled on the rotating shaft 31 by interference fit). During the assembly process, it is noted that the inner ring groove 336 of the right inner ring 335 of the bearing corresponds to the position of the anti-rotation pin hole 312 of the rotating shaft 31. The clamping nut 34 is rotated and installed on the thread of the rotating shaft 31. When the preload requirement is met, ensure that the position of the nut groove 342 of the clamping nut 34 corresponds to the inner ring groove 336 of the right inner ring 335 of the bearing and the position of the anti-rotation pin 312 hole on the rotating shaft 31. After that, the anti-rotation pin 36 is inserted into the rotating shaft 31, and at the same time, the relative rotation between the right inner ring 335 of the bearing and the clamping nut 34 and the rotating shaft 31 is restricted, and the self-locking elastic ring 35 is pushed axially into the clamping nut 34. Since the self-locking elastic ring 35 has a certain elasticity and self-locking function, after the clamping nut 34 is pushed in and stuck through the loading edge 353 of the self-locking elastic ring 9, the locking plate 352 on the rear side of the self-locking elastic ring 9 is bent and pressed onto the nut 34 to prevent the anti-rotation pin 10 from flying out during operation, and the installation is completed.

[0041] The bearing locking structure of the present application can ensure the effective fixation between the right inner ring 335 of the bearing, the clamping nut 34 and the rotating shaft 31 during operation. When the rotating shaft 31 is subjected to torque, under the action of the interference and the preload force, the distance sleeve 32, the left inner ring 334 of the bearing and the right inner ring 335 of the bearing are driven to rotate. The anti-rotation pin 10 ensures the synchronous rotation of the rotating shaft 31, the right inner ring 335 of the bearing and the clamping nut 34. The self-locking elastic ring 35 ensures that the anti-rotation pin 10 cannot fly off during operation. The rolling body 333 works under the drive of the left inner ring 334 and the right inner ring 335 of the bearing. The retaining frame 332 maintains the normal operation of the rolling body 333. The outer ring 331 of the bearing supports the rolling body 333 and the retaining frame 334 to ensure the normal operation of the roller.

[0042] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A bearing locking structure, characterized in that: include: A rotating shaft, wherein a radial protrusion is provided on the rotating shaft, and a smooth section and a threaded section are provided in sequence from the radial protrusion to the bearing installation side, and an anti-rotation pin hole is provided on the threaded section; A bearing, the bearing being mounted on the smooth section of the rotating shaft and being directly or indirectly axially limited by the radial protrusion, the bearing having a bearing inner ring, and the side of the bearing inner ring away from the radial protrusion having an inner ring groove adapted to the size of the anti-rotation pin; A clamping nut, which is mounted on the threaded section of the rotating shaft and is used to axially lock the bearing. The side of the clamping nut facing the bearing has a nut groove adapted to the size of the anti-rotation pin; An anti-rotation pin, which is installed in the anti-rotation pin hole of the rotating shaft and is also located in the groove formed by the inner ring groove and the nut groove to prevent the bearing inner ring and / or the clamping nut from rotating; and A self-locking elastic ring has a locking plate on one side and an elastic locking plate on the other side. When the self-locking elastic ring is installed on the clamping nut, the elastic locking plate can provide elastic pressure to the anti-rotation pin to prevent the anti-rotation pin from falling off. The self-locking elastic ring is limited on the clamping nut by bending the locking plate.

2. The bearing locking structure according to claim 1, characterized in that: The bearing locking structure also includes a distance sleeve, which is installed on the smooth section of the rotating shaft and is located between the radial protrusion and the inner ring of the bearing.

3. The bearing locking structure according to claim 2, characterized in that: The distance sleeve and the rotating shaft are matched with each other in a clearance, and the clearance is no greater than 0.05 mm.

4. The bearing locking structure according to claim 2 or 3, characterized in that: The length of the smooth section is adapted to the sum of the lengths of the distance sleeve and the bearing inner ring.

5. The bearing locking structure according to claim 1, characterized in that: The bearing is a bearing having rolling elements.

6. The bearing locking structure according to claim 1, characterized in that: The inner ring groove on the inner ring of the bearing and the nut groove on the clamping nut are symmetrical in structure.

7. The bearing locking structure according to claim 6, characterized in that: There are multiple inner ring grooves on the bearing inner ring and / or multiple nut grooves on the clamping nut.

8. The bearing locking structure according to claim 1, characterized in that: The elastic locking piece of the self-locking elastic ring is bent to form an inclined surface, and the minimum size of the inclined surface is smaller than the height of the anti-rotation pin installed on the rotating shaft.

9. The bearing locking structure according to claim 8, characterized in that: There are unloading grooves between the elastic locking pieces of the self-locking elastic ring.

10. The bearing locking structure according to claim 8 or 9, characterized in that: The self-locking elastic ring is made of elastic metal material.

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