Round nut anti-loosening structure

Abstract

The utility model discloses a round nut anti-loose structure which comprises an output shaft and a round nut which is sleeved on the output shaft and is in threaded connection with the output shaft, at least one locking portion is arranged between the round nut and the output shaft, the locking portion is provided with a locking groove, the locking groove is defined by the inner wall of the round nut and the outer wall of the output shaft, and an expansion body is inserted in the locking groove. And the expansion body is in interference fit with the groove wall of the locking groove. The round nut can be locked at any position after being tightened, the strength of the round nut is not reduced, an assembly tool is simple, the assembly quality is easy to control, and disassembly is convenient.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of round nut locking anti-loose, especially to a round nut anti-loose structure. BACKGROUND

[0002] As an important mechanical transmission device, yaw and pitch gearbox mainly realizes yaw control and blade angle adjustment of wind turbine generator. The output shaft of yaw and pitch gearbox is usually supported by a pair of tapered roller bearings, and the stiffness of the output shaft and the tapered roller bearings is ensured by pre-tightening the tapered roller bearings with round nuts, so that the output shaft can rotate and operate. Therefore, the pre-tightening of the round nut must not fail to ensure that the gearbox can operate normally throughout its life cycle, so the locking and anti-loose of the round nut are particularly important.

[0003] At present, there are mainly three ways for the locking and anti-loose structure of the round nut used in batch yaw and pitch gearboxes: first, the locking and anti-loose structure is combined and used with round nuts and round nut stop pads. The anti-loose principle of this method is that the inner clamping tongue of the round nut stop pad is clamped into the shaft, and the outer clamping tongue is deformed and clamped into the round nut slot to realize the locking of the round nut. However, this method has obvious disadvantages. The inner and outer clamping tongues of the round nut stop pad need to be clamped into the shaft and the round nut respectively, and cannot realize locking at any position. The inner and outer clamping tongues of the round nut stop pad are easy to break under stress. The stress concentration of the round nut slot bottom needs to be controlled, otherwise the round nut may break from the stress concentration position.

[0004] Second, the embedded anti-loose round nut with a thin-wall deformation structure. The anti-loose principle of this method is that the thin-wall part of the round nut is deformed and embedded into the slot by external force. This method has the advantage of realizing locking of the round nut at any position, but the thin-wall part increases the cost of the round nut, the assembly tooling is complex and difficult to control, the quality is unstable, the tooling is easy to wear, and it is not suitable for batch production.

[0005] Third, the anti-loose body is embedded into the round nut anti-loose structure with a groove. The anti-loose principle of this method is that after the round nut is pre-tightened, the anti-loose body is embedded into the groove of the round nut to prevent the round nut from loosening by damaging the threads of the round nut. This method has the advantage of realizing locking of the round nut at any position, but the groove added to the threads of the round nut affects the strength of the round nut, and it is difficult to disassemble after the threads of the round nut are damaged.

[0006] In summary, the current round nut locking and anti-loose structure still has the disadvantages of being unable to realize locking at any position, poor locking effect, reducing the strength of the round nut, and complex and difficult-to-control assembly tooling, which need to be solved urgently. UTILITY MODEL CONTENTS

[0007] The utility model discloses a technical problem to be solved is provided with a kind of round nut anti-loose structure, it can be locked in arbitrary position after round nut tightening, not reduce the strength of round nut, assembly tooling is simple and easy to control assembly quality, can be conveniently disassembled.

[0008] To solve the above technical problems, the utility model provides a round nut anti-loose structure adopts the following technical scheme:

[0009] A kind of round nut anti-loose structure, including output shaft and the round nut of sleeve and screw connection in output shaft, at least one locking portion is provided between the round nut and output shaft, the locking portion is equipped with locking groove, the locking groove is formed by the inner wall of round nut and the outer wall of output shaft, expansion body is inserted in the locking groove, the expansion body is interference fit with the groove wall of locking groove.

[0010] By adopting the above technical scheme, expansion body is inserted into locking groove, by pressing plate and the part of location, the end surface of expansion body is pressed to be substantially flush with the end surface of output shaft, whether completion assembly can be judged visually.Expansion body is interference fit with the groove wall of locking groove after assembly is completed, so that output shaft is locally expanded and deformed, so as to eliminate the thread gap between output shaft and round nut, to limit the circumferential rotation of round nut, so as to realize the locking anti-loose of nut relative to output shaft.Meanwhile, expansion body can damage the internal thread of round nut when being pressed into locking groove, so as to increase the reliability of round nut locking anti-loose.

[0011] Optionally, the groove wall section profile of the locking groove is U-shaped.

[0012] By adopting the above technical scheme, since expansion body is pressed into locking groove, it will resist and extrude the groove wall of locking groove, and the U-shaped groove wall section profile of the locking groove can avoid stress concentration and fracture, to ensure that the strength of output shaft is not reduced.

[0013] Optionally, the expansion body is a cylinder, a cone, a cuboid or a circular truncated cone.

[0014] Optionally, the end surface of the expansion body is provided with a threaded hole.

[0015] By adopting the above technical scheme, the tool for disassembling expansion body is inserted and screw-connected to expansion body, which can provide the force arm of pulling out expansion body from output shaft, so as to facilitate disassembly.

[0016] Optionally, the end surface of the round nut is provided with an assembly clamping groove, and the assembly clamping groove is used for assembling a tightening tool.

[0017] By adopting the technical scheme, the assembling and tightening tool is inserted into the assembling clamping groove, so that the round nut can be tightened relative to the output shaft; compared with arranging the assembling clamping groove on the thread locking section of the round nut, arranging the assembling clamping groove only on the end face of the round nut can ensure that the strength of the round nut is not reduced.

[0018] Optionally, the number of the locking grooves is two, three or four.

[0019] Optionally, the locking grooves are arranged at equal intervals around the central axis of the output shaft.

[0020] In summary, the utility model has at least one of the following beneficial technical effects:

[0021] 1. The interference fit between the expansion body and the groove wall of the locking groove causes the local expansion and deformation of the output shaft, so as to eliminate the thread gap between the output shaft and the round nut, thereby limiting the circumferential rotation of the round nut, and achieving the locking and anti-loosening of the nut relative to the output shaft.

[0022] 2. When the expansion body is pressed into the locking groove, the internal thread of the round nut can be damaged, thereby increasing the reliability of the locking and anti-loosening of the round nut.

[0023] 3. Compared with arranging the assembling clamping groove on the thread locking section of the round nut, arranging the assembling clamping groove only on the end face of the round nut can ensure that the strength of the round nut is not reduced.

[0024] 4. The tool for disassembling the expansion body is inserted and threadedly connected to the expansion body, which can provide a force arm for pulling out the expansion body from the output shaft, thereby facilitating disassembly. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 is the overall structure schematic view of the utility model for displaying the round nut anti-loosening structure.

[0026] Figure 2 is Figure 1 the enlarged structure schematic view of part A in FIG.

[0027] Reference signs: 1, expansion body; 2, locking groove; 3, round nut; 4, output shaft; 5, bearing; 6, assembling clamping groove. DETAILED DESCRIPTION

[0028] The following will be described in detail in combination with the accompanying Figures 1-2 The utility model will be further described in detail.

[0029] The utility model embodiment discloses a round nut anti-loosening structure. Figure 1, the round nut anti-loose structure comprises an output shaft 4 and a round nut 3, and the round nut 3 is sleeved and threadedly connected to the output shaft 4. Two locking portions are arranged between the round nut 2 and the output shaft 4, and the two locking portions are arranged at intervals around the central axis of the output shaft 4. The locking portion is provided with a locking groove 2, and the locking groove 2 is formed by the inner wall of the round nut 3 and the outer wall of the output shaft 4, and the opening directions of the two locking grooves 2 are parallel to the central axis of the output shaft 4. The groove walls on the side close to the round nut 3 of the two locking grooves 2 are both in an open arrangement.

[0030] Referring to Figure 1 , the locking groove 2 is inserted with an expansion body 1, and the expansion body 1 is a cylinder, a cone, a cuboid or a circular truncated cone. In the embodiment of the application, the expansion body 1 is a cylinder. The size of the radial section of the expansion body 1 is greater than the size of the opening surface of the locking groove 2, and the expansion body 1 is in interference fit with the groove wall of the locking groove 2.

[0031] The expansion body 1 is inserted into the locking groove 2, and the pressure plate and the positioning parts are used to apply pressure to the end face of the expansion body 1 so that the end face is basically flush with the end face of the output shaft 4. Whether the assembly is completed can be judged by visual observation. Since the size of the radial section of the expansion body 1 is greater than the size of the opening surface of the locking groove 2, after the expansion body 1 is pressed into the locking groove 2, the output shaft 4 is locally expanded and deformed. The expansion body 1 is pressed into the required tool and process, and whether the assembly is qualified can be judged by visual observation, which has the advantages of simple operation and easy control.

[0032] After assembly, the expansion body 1 is in interference fit with the groove wall of the locking groove 2, so that the output shaft 4 is locally expanded and deformed, thereby eliminating the thread gap between the output shaft 4 and the round nut 3, limiting the circumferential rotation of the round nut 3, and achieving the locking and anti-loose of the nut relative to the output shaft 4. Since the groove wall on the side close to the round nut 3 of the locking groove 2 is also in an open arrangement, the expansion body 1 can damage the internal thread of the round nut 3 when it is pressed into the locking groove 2, thereby increasing the reliability of the locking and anti-loose of the round nut 3.

[0033] Referring to Figure 1 , since the expansion body 1 is pressed into the locking groove 2, it will resist and extrude the groove wall of the locking groove 2. In order to ensure that the strength of the output shaft 4 is not reduced and that the locking and anti-loose of the round nut 3 can be more stable, the cross-sectional profile of the groove wall of the locking groove 2 is in the shape of U. The cross-sectional profile of the groove wall of the locking groove 2 in the shape of U can avoid stress concentration and fracture, and ensure that the strength of the output shaft 4 is not reduced.

[0034] Referring to Figure 1 , in order to facilitate the disassembly of the expansion body 1 relative to the output shaft 4, an internal threaded hole is arranged on the end face of the end of the expansion body 1 away from the output shaft 4. The tool for disassembling the expansion body 1 is inserted and threadedly connected to the expansion body 1, which can provide a force arm for pulling out the expansion body 1 from the output shaft 4, so as to facilitate disassembly.

[0035] Referring to Figure 2In order to facilitate the assembly and tightening of the round nut 3 relative to the output shaft 4 while not reducing the strength of the round nut 3, an assembly clamping groove 6 is formed in the end face of the round nut 3, the opening direction of the assembly clamping groove 6 is parallel to the axis of the output shaft 4 and is arranged away from the bearing 5, and the assembly clamping groove 6 is used for assembly and tightening tool. The assembly tool is inserted into the assembly clamping groove 6, which facilitates the tightening of the round nut 3 relative to the output shaft 4; compared with arranging the assembly clamping groove 6 on the threaded locking section of the round nut 3, arranging the assembly clamping groove 6 only on the end face of the round nut 3 can ensure that the strength of the round nut 3 is not reduced.

[0036] The implementation principle of the anti-loose structure of the round nut 3 is that the expansion body 1 is inserted into the locking groove 2, the expansion body 1 is pressed to the end face of the output shaft 4 by the pressing plate and the positioning parts, and whether the assembly is completed can be judged by visual observation. After assembly, the expansion body 1 and the groove wall of the locking groove 2 are in interference fit, so that the output shaft 4 is locally expanded and deformed, thereby eliminating the thread gap between the output shaft 4 and the round nut 3, so as to limit the circumferential rotation of the round nut 3, thereby realizing the locking and anti-loose of the nut relative to the output shaft 4. Since the groove wall on the side close to the round nut 3 of the locking groove 2 is also arranged in an open manner, the expansion body 1 can damage the internal thread of the round nut 3 when being pressed into the locking groove 2, thereby increasing the reliability of the locking and anti-loose of the round nut 3.

[0037] The above are preferred embodiments of the utility model, which do not limit the protection scope of the utility model, so that: any equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A round nut anti-loosening structure, characterized in that: The output shaft (4) and the round nut (3) are sleeved and threadedly connected, at least one locking part is arranged between the round nut (3) and the output shaft (4), the locking part is provided with a locking groove (2), the locking groove (2) is formed by the inner wall of the round nut (3) and the outer wall of the output shaft (4), the locking groove (2) is internally inserted with an expansion body (1), and the expansion body (1) is in interference fit with the groove wall of the locking groove (2).

2. The round nut anti-loosening structure according to claim 1, characterized in that: The groove wall of the locking groove (2) is in U-shaped cross-section profile.

3. The round nut anti-loosening structure according to claim 1, characterized in that: The expansion body (1) is in cylindrical body, conical body, cuboid or circular truncated cone body.

4. The round nut anti-loosening structure according to claim 1, characterized in that: An end surface of the round nut (3) is provided with an assembly clamping groove (6), and the assembly clamping groove (6) is used for assembling a tightening tool.

5. The round nut anti-loosening structure according to claim 1, characterized in that: An end surface of the expansion body (1) is provided with a threaded hole.

6. The round nut anti-loosening structure according to claim 1, characterized in that: The number of the locking grooves (2) is two, three or four.

7. The round nut anti-loosening structure according to claim 6, characterized in that: The locking grooves (2) are arranged at equal intervals around the central axis of the output shaft (4).

Images