Bearing locking nut locking mechanism and speed reducer

Abstract

The utility model belongs to the technical field of engineering machinery and provides a bearing locking nut anti-loosening mechanism and a speed reducer, the bearing locking nut anti-loosening mechanism comprises a bearing body, an output shaft, a locking nut and an anti-loosening tensioning assembly, the bearing body is sleeved with the output shaft, the output shaft is provided with a limiting step used for being in axial limiting fit with the first axial end face of the bearing body, and the locking nut is screwed to the output shaft and used for abutting against the second axial end face of the bearing body. The anti-loose tensioning assembly is connected between the output shaft and the locking nut and used for tensioning the locking nut in the screwing direction of the locking nut. According to the locking mechanism for the bearing locking nut, locking of the locking nut can be achieved under the condition that complete threads of the locking nut are guaranteed, and therefore disassembly is convenient.

Description

Technical Field

[0001] The utility model belongs to the technical field of construction machinery, and particularly relates to a loosening prevention mechanism for a bearing locking nut and a speed reducer. Background Art

[0002] When using a bearing that requires axial preloading, a locking nut is generally used for preloading. By screwing the locking nut onto the output shaft, an axial preloading force can be applied to the bearing to push the bearing. Among them, when using a locking nut for preloading, it is necessary to perform a loosening prevention treatment on the locking nut.

[0003] The existing loosening prevention treatment for locking nuts generally destroys the threads of the locking nut by means of stamping and riveting, so as to achieve permanent loosening prevention. However, after the threads are damaged, when the locking nut needs to be disassembled, the locking nut must be disassembled destructively, resulting in very troublesome disassembly and maintenance. Summary of the Utility Model

[0004] In view of the above defects or deficiencies, the utility model provides a loosening prevention mechanism for a bearing locking nut and a speed reducer, aiming to solve the technical problem that the existing loosening prevention treatment method for a bearing locking nut is prone to difficult disassembly.

[0005] To achieve the above object, the utility model provides a loosening prevention mechanism for a bearing locking nut. The loosening prevention mechanism for a bearing locking nut includes a bearing body, an output shaft, a locking nut, and a loosening prevention tensioning assembly. The output shaft is sleeved on the bearing body, and a limiting step for axially limiting and cooperating with the axial first end face of the bearing body is provided on the output shaft. The locking nut is screwed onto the output shaft and is used to abut against the axial second end face of the bearing body. The loosening prevention tensioning assembly is connected between the output shaft and the locking nut and is used to tension the locking nut along the screwing direction of the locking nut.

[0006] In an embodiment of the utility model, a first threaded hole is provided on the locking nut, a second threaded hole is provided on the output shaft, and the loosening prevention tensioning assembly includes a first threaded member screwed into the first threaded hole, a second threaded member screwed into the second threaded hole, and a loosening prevention tensioning rope wound and connected between the first threaded member and the second threaded member.

[0007] In an embodiment of the utility model, locking through holes are respectively provided on the first threaded member and the second threaded member. The loosening prevention tensioning rope is passed through the locking through holes of the first threaded member and the second threaded member, and both ends are respectively wound around the first threaded member and the second threaded member.

[0008] In an embodiment of the utility model, the winding direction of the loosening prevention tensioning rope from the end to the middle is the same as the screwing direction of the first threaded member and the second threaded member wound at the corresponding end.

[0009] In an embodiment of the present utility model, the included angle between the tensioning direction of the anti-loosening tensioning rope on the locking nut and the tangential component of the screwing direction of the locking nut at the first threaded hole is 0 to 90°.

[0010] In an embodiment of the present utility model, the number of the first threaded holes is multiple, and the multiple first threaded holes are arranged at intervals along the circumferential direction of the central axis of the locking nut; and / or the number of the second threaded holes is multiple, and the multiple second threaded holes are arranged at intervals in sequence along the circumferential direction of the central axis of the output shaft.

[0011] In an embodiment of the present utility model, the output shaft includes a bearing connection part and a shaft body extending part. The bearing connection part is sleeved on the bearing body and has a limiting step at one axial end. The other axial end of the bearing connection part is connected to the shaft body extending part. An external thread is provided on the outer peripheral wall of the bearing connection part near one end of the shaft body extending part, and the locking nut is threadedly engaged with the external thread.

[0012] In an embodiment of the present utility model, the diameter of the shaft body extending part is smaller than that of the bearing connection part. A first flush surface is formed between the bearing connection part and the shaft body extending part. The surface of the locking nut facing away from the bearing body is a second flush surface. The first flush surface and the second flush surface are flush, and the anti-loosening tensioning assembly is connected between the first flush surface and the second flush surface.

[0013] In an embodiment of the present utility model, the bearing body includes an inner ring, an outer ring and rollers arranged between the inner ring and the outer ring. The locking nut is threadedly connected to the output shaft and is used for pressing and abutting against the axial end face of the inner ring.

[0014] In an embodiment of the present utility model, the rollers are tapered rollers.

[0015] To achieve the above object, the present utility model further provides a speed reducer, and the speed reducer includes the bearing locking nut anti-loosening mechanism described above.

[0016] Through the above technical solutions, the bearing locking nut anti-loosening mechanism provided by the embodiment of the present utility model has the following beneficial effects:

[0017] The bearing locking nut anti-loosening mechanism in the present utility model can achieve anti-loosening of the locking nut by arranging an anti-loosening tensioning assembly between the output shaft and the locking nut and setting the tensioning direction of the anti-loosening tensioning assembly to tension the locking nut along the screwing direction of the locking nut. Using the anti-loosening tensioning assembly for anti-loosening can avoid damage to the threads of the locking nut, thereby facilitating the later disassembly of the locking nut.

[0018] Other features and advantages of the present utility model will be described in detail in the subsequent specific implementation part. Description of the Drawings

[0019] The accompanying drawings are used to provide an understanding of the present utility model and form a part of the specification. Together with the following specific embodiments, they are used to explain the present utility model, but do not constitute a limitation to the present utility model. In the accompanying drawings:

[0020] Figure 1 is a schematic cross-sectional structure diagram of a loosening prevention mechanism for a bearing locking nut according to an embodiment of the present utility model;

[0021] Figure 2 is a schematic structure diagram of a first perspective of a loosening prevention mechanism for a bearing locking nut according to an embodiment of the present utility model;

[0022] Figure 3 is a schematic structure diagram of the winding manner of both ends of a loosening prevention tension rope on a first threaded member and a second threaded member according to an embodiment of the present utility model;

[0023] Figure 4 is a force analysis diagram when the loosening prevention tension rope tightens the locking nut according to an embodiment of the present utility model.

[0024] Description of the reference numerals in the drawings

[0025] 1. Bearing body; 11. Inner ring; 12. Outer ring; 13. Roller; a. Axial first end face; b. Axial second end face; 2. Output shaft; 21. Bearing connection part; 211. Limiting step; 212. Second threaded hole; 213. First flush surface; 22. Axial body extension; 3. Locking nut; 31. First threaded hole; 32. Second flush surface; 4. Loosening prevention tension assembly; 41. First threaded member; 42. Second threaded member; 43. Loosening prevention tension rope. Specific embodiments

[0026] The following details the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining and understanding the present utility model, and do not limit the present utility model.

[0027] The loosening prevention mechanism for a bearing locking nut of the present utility model will be described below with reference to the accompanying drawings.

[0028] The present utility model provides a loosening prevention mechanism for a bearing locking nut, as Figure 1 and Figure 2 shown, the loosening prevention mechanism for a bearing locking nut includes:

[0029] Bearing body 1;

[0030] Output shaft 2, sleeved on the bearing body 1 and provided with a limiting step 211 on the output shaft 2 for axially limiting and cooperating with the axial first end face a of the bearing body 1;

[0031] A locking nut 3 is screwed onto the output shaft 2 and is used to abut against the second axial end face b of the bearing body 1; and

[0032] A loosening prevention and tensioning assembly 4 is connected between the output shaft 2 and the locking nut 3 and is used to tension the locking nut 3 in the tightening direction of the locking nut 3.

[0033] During use, by tightening the locking nut 3, the bearing body 1 can be pressed against the limiting step 211 of the output shaft 2 to realize pre-tightening of the bearing body 1. After the locking nut 3 is tightened in place, by arranging the loosening prevention and tensioning assembly 4 between the output shaft 2 and the locking nut 3 and setting the tensioning direction of the loosening prevention and tensioning assembly 4 to tension the locking nut 3 in the tightening direction of the locking nut 3, the loosening of the locking nut 3 can be prevented by the tension of the loosening prevention and tensioning assembly 4. And when the bearing body 1 needs to be disassembled, only the loosening prevention and tensioning assembly 4 between the output shaft 2 and the locking nut 3 needs to be disassembled or cut off, and then the locking nut 3 can be unscrewed very conveniently.

[0034] In summary, in the bearing locking nut loosening prevention mechanism of the present utility model, by arranging the loosening prevention and tensioning assembly 4 between the output shaft 2 and the locking nut 3 and setting the tensioning direction of the loosening prevention and tensioning assembly 4 to tension the locking nut 3 in the tightening direction of the locking nut 3, the loosening prevention of the locking nut 3 can be realized, and using the loosening prevention and tensioning assembly 4 for loosening prevention can avoid damage to the threads of the locking nut 3, thereby facilitating the later disassembly of the locking nut 3.

[0035] In the embodiment of the present utility model, by adopting the tensioning method for loosening prevention, the use of adhesives can also be avoided, ensuring the integrity of the peripheral wall of the locking nut, thereby facilitating the sealing of the oil seal.

[0036] There are many forms of arrangement of the loosening prevention and tensioning assembly 4, such as Figure 2 and Figure 4 As shown, in the embodiment of the present utility model, the locking nut 3 may be provided with a first threaded hole 31, the output shaft 2 may be provided with a second threaded hole 212, and the loosening prevention and tensioning assembly 4 may include a first threaded member 41 screwed into the first threaded hole 31, a second threaded member 42 screwed into the second threaded hole 212, and a loosening prevention and tensioning rope 43 wound and connected between the first threaded member 41 and the second threaded member 42. After the first threaded member 41 and the second threaded member 42 are respectively installed in place, by tightly winding the loosening prevention and tensioning rope 43 around the first threaded member 41 and the second threaded member 42, the loosening prevention and tensioning of the locking nut 3 can be realized, and when the locking nut 3 needs to be disassembled, only the loosening prevention and tensioning rope 43 needs to be cut off or removed.

[0037] In the embodiment of the present utility model, a metal tab or a connection method using a tension spring can also be used for loosening prevention and tensioning. Or a pin shaft can be used to replace the first threaded member 41 and the second threaded member 42, such as directly welding the pin shaft to the output shaft 2 and the locking nut 3.

[0038] In an embodiment of the present utility model, the first threaded member 41 and the second threaded member 42 may be through-hole screws. A locking through-hole is provided on the through-hole screw. The anti-loosening tensioning rope 43 can first pass through the locking through-holes on the first threaded member 41 and the second threaded member 42, and then the two ends are respectively wound around the first threaded member 41 and the second threaded member 42. By providing the locking through-hole, the amount of thread slipping of the anti-loosening tensioning rope 43 can be reduced.

[0039] As Figure 2 and Figure 3 shown, in an embodiment of the present utility model, the winding directions of the anti-loosening tensioning rope 43 from the end to the middle are the same as the tightening directions of the first threaded member 41 and the second threaded member 42 wound at the corresponding ends. For example, if the tightening direction of the first threaded member 41 is right-handed, the first end of the anti-loosening tensioning rope 43 is wound around the first threaded member 41. Looking from the first end of the anti-loosening tensioning rope 43 to the middle, the winding direction of the first end is right-handed. By setting the winding direction of the anti-loosening tensioning rope 43, when the anti-loosening tensioning rope 43 tightens the locking nut 3, a force in the tightening direction can be applied to the first threaded member 41 and the second threaded member 42.

[0040] In an embodiment of the present utility model, the anti-loosening tensioning rope 43 may be a steel wire rope.

[0041] As Figure 4 shown, in an embodiment of the present utility model, the angle between the tensioning direction of the anti-loosening tensioning rope 43 on the locking nut 3 and the tangential component of the tightening direction of the locking nut 3 at the first threaded hole 31 is 0 to 90°, that is Figure 4 in which the smaller the angle between F and F 1 , the better the anti-loosening effect of the locking nut 3.

[0042] As Figure 2 shown, in an embodiment of the present utility model, the number of the first threaded holes 31 is multiple, and the multiple first threaded holes 31 are arranged at intervals along the circumferential direction of the central axis of the locking nut 3; and / or the number of the second threaded holes 212 is multiple, and the multiple second threaded holes 212 are arranged at intervals in sequence along the circumferential direction of the central axis of the output shaft 2.

[0043] As Figure 4 shown, in practical applications, it is found that after the locking nut 3 is tightened each time, the relative position between the first threaded hole 31 on the locking nut 3 and the second threaded hole 212 on the output shaft 2 is uncertain. In order to ensure the best anti-loosening effect of the locking nut 3 after each disassembly and assembly, multiple first threaded holes 31 or second threaded holes 212 can be provided, and the hole closest to K2 is selected as the installation hole position of the first threaded member 41. Among them, the point K2 represents the corresponding point when α, β, and θ exactly form a right triangle.

[0044] As Figure 2 shown, in the embodiment of the present utility model, the number of the anti-loosening tensioning assemblies 4 can be multiple groups. Through multiple groups of anti-loosening tensioning assemblies 4, the anti-loosening performance of the locking nut 3 can be increased. Preferably, the anti-loosening tensioning ropes 43 in two groups of anti-loosening tensioning assemblies 4 in opposite directions are arranged in parallel. If the number of the anti-loosening tensioning assemblies 4 is two groups, the anti-loosening tensioning ropes 43 in the two groups of anti-loosening tensioning assemblies 4 are preferably rotationally symmetric and parallel to each other.

[0045] As Figure 1 shown, in the embodiment of the present utility model, the output shaft 2 includes a bearing connection portion 21 and a shaft body extending portion 22. The bearing connection portion 21 is sleeved on the bearing body 1 and is provided with a limiting step 211 at one axial end. The other axial end of the bearing connection portion 21 is connected to the shaft body extending portion 22. An external thread is provided on the outer peripheral wall of the bearing connection portion 21 near one end of the shaft body extending portion 22, and the locking nut 3 is in threaded connection with the external thread.

[0046] Specifically, the bearing body 1 includes an inner ring 11, an outer ring 12, and rollers 13 disposed between the inner ring 11 and the outer ring 12. The bearing connection portion 21 is sleeved on the inner ring 11 by interference fit. The limiting step 211 of the output shaft 2 abuts against the axial first end face a of the inner ring 11. The locking nut 3 is screwed on the output shaft 2 and is used to apply an axial pressing force to the axial second end face b of the inner ring 11, so as to prevent the inner ring 11 from axially moving relative to the output shaft 2. Wherein, when the output shaft 2 rotates, the inner ring 11 and the locking nut 3 will rotate together with the output shaft 2. By providing the anti-loosening tensioning assembly 4, the tension on the locking nut 3 can be maintained when the output shaft 2 is working, so as to ensure the axial pressing force on the inner ring 11.

[0047] In the embodiment of the present utility model, the diameter of the shaft body extending portion 22 is smaller than the diameter of the bearing connection portion 21. A first flush surface 213 is formed between the bearing connection portion 21 and the shaft body extending portion 22. The surface of the locking nut 3 facing away from the bearing body 1 is a second flush surface 32. The first flush surface 213 and the second flush surface 32 are flush. The anti-loosening tensioning assembly 4 is connected between the first flush surface 213 and the second flush surface 32. By providing the first flush surface 213 and the second flush surface 32, it is convenient for the processing of the threaded hole and the installation of the anti-loosening tensioning assembly 4.

[0048] In the embodiment of the present utility model, an oil seal is further provided between the outer ring 12 and the locking nut 3.

[0049] In the embodiment of the present utility model, the roller 13 is a tapered roller, and the bearing body 1 is preferably a tapered roller bearing capable of bearing axial load.

[0050] To achieve the above object, the present utility model further provides a speed reducer, which includes the anti-loosening mechanism for bearing locking nuts described above. Since the speed reducer adopts all the technical solutions of the above embodiments, it has at least the beneficial effects brought by the above embodiments, which will not be repeated here.

[0051] In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0052] In the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", "connected to", "fixed" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection, an electrical connection or communication with each other; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0053] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0054] Although the embodiments of the present utility model have been described above, it can be understood that the above embodiments are exemplary and cannot be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present utility model.

Claims

1. A bearing locking nut anti-loosening mechanism, characterized in that: The bearing locking nut anti-loosening mechanism comprises: Bearing body (1); An output shaft (2) is sleeved on the bearing body (1) and is provided with a limiting step (211) for axially limiting cooperation with the axial first end face (a) of the bearing body (1); A locking nut (3) screwed onto the output shaft (2) and used to abut against the axial second end surface (b) of the bearing body (1); and An anti-loosening tensioning assembly (4) is connected between the output shaft (2) and the locking nut (3) and is used to tighten the locking nut (3) along the tightening direction of the locking nut (3).

2. The bearing locking nut anti-loosening mechanism according to claim 1, characterized in that: The locking nut (3) is provided with a first threaded hole (31), the output shaft (2) is provided with a second threaded hole (212), and the anti-loosening tensioning assembly (4) comprises a first threaded member (41) screwed into the first threaded hole (31), a second threaded member (42) screwed into the second threaded hole (212), and an anti-loosening tensioning rope (43) wound and connected between the first threaded member (41) and the second threaded member (42).

3. The bearing locking nut anti-loosening mechanism according to claim 2, characterized in that: The first threaded member (41) and the second threaded member (42) are respectively provided with locking holes, and the anti-loosening tension rope (43) is passed through the locking holes of the first threaded member (41) and the second threaded member (42) and has two ends respectively wound around the first threaded member (41) and the second threaded member (42).

4. The bearing locking nut anti-loosening mechanism according to claim 2, characterized in that: The winding direction of the anti-loosening tension rope (43) from the end to the middle is the same as the tightening direction of the first threaded member (41) and the second threaded member (42) wound at the corresponding ends.

5. The bearing locking nut anti-loosening mechanism according to claim 2, characterized in that: The angle between the tightening direction of the locking nut (3) by the anti-loosening tension rope (43) and the tangential component of the tightening direction of the locking nut (3) at the first threaded hole (31) is 0 to 90 degrees.

6. The bearing locking nut anti-loosening mechanism according to claim 5, characterized in that: The number of the first threaded holes (31) is plural, and the plurality of the first threaded holes (31) are arranged at intervals in the circumferential direction along the central axis of the locking nut (3); and / or The number of the second threaded holes (212) is multiple, and the multiple second threaded holes (212) are arranged in sequence and at intervals in the circumferential direction of the central axis of the output shaft (2).

7. The bearing locking nut anti-loosening mechanism according to any one of claims 1 to 6, characterized in that: The output shaft (2) comprises a bearing connection portion (21) and a shaft extension portion (22); the bearing connection portion (21) is sleeved on the bearing body (1) and is provided with a limiting step (211) at one axial end; the other axial end of the bearing connection portion (21) is connected to the shaft extension portion (22); an external thread is provided on an outer peripheral wall of the bearing connection portion (21) close to one end of the shaft extension portion (22); and the locking nut (3) is screwed together with the external thread.

8. The bearing locking nut anti-loosening mechanism according to claim 7, characterized in that: The diameter of the shaft body extension portion (22) is smaller than the diameter of the bearing connection portion (21); a first flush surface (213) is formed between the bearing connection portion (21) and the shaft body extension portion (22); a side of the locking nut (3) facing away from the bearing body (1) is a second flush surface (32); the first flush surface (213) is flush with the second flush surface (32); and the anti-loosening tensioning assembly (4) is connected between the first flush surface (213) and the second flush surface (32).

9. The bearing locking nut anti-loosening mechanism according to any one of claims 1 to 6, characterized in that: The bearing body (1) comprises an inner ring (11), an outer ring (12) and a roller (13) arranged between the inner ring (11) and the outer ring (12); the locking nut (3) is screwed onto the output shaft (2) and is used for pressing against the axial end face of the inner ring (11).

10. A reducer, characterized in that: It comprises a bearing locking nut anti-loosening mechanism according to any one of claims 1 to 9.

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