Locking nut for decomposing pretightening force

Abstract

The utility model discloses a locking nut for decomposing pretightening force, and belongs to the technical field of locking devices. The nut comprises a nut body with a central through hole, a pre-tightening hole extending in the radial direction of the nut body is formed in the circumferential direction of the nut body, and the pre-tightening hole is provided with a force application rod used for pre-tightening the nut body; a plurality of annular and evenly-distributed locking through holes are formed in the nut body in the axial direction, locking bolts are arranged in the locking through holes, and the locking bolts and the locking through holes are in threaded connection and used for locking the nut body. According to the locking nut capable of decomposing the pretightening force, due to the arrangement of the plurality of locking bolts, the larger locking force can be decomposed to the plurality of locking bolts; in this way, the locking force of a single locking bolt can be met through a conventional electric wrench, large driving equipment does not need to be additionally arranged, and the input cost of construction equipment is effectively reduced; and meanwhile, the problem that large equipment is limited in operation in a narrow space is solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of locking devices, and more specifically relates to a decomposing pre-tightening force locking nut. Background Art

[0002] Lock nuts, a commonly used fastener, are typically used with screws, with the two connected by a threaded connection to secure and connect workpieces. Improving the locking force of lock nuts to prevent loosening or falling out under vibration or dynamic loads, thereby ensuring stable and safe equipment operation, is of great practical significance.

[0003] For example, in patent CN204357863U, a double-nut locking mechanism is disclosed. This application utilizes two interacting nuts to prevent loosening, and prevents the nuts from loosening through the pressure and friction between the two nuts.

[0004] For example, patent CN213870638U discloses a locking mechanism with a double nut and a retaining washer. In this application, when the locking nut is tightened, in addition to the friction between the threads, the locked parts are also affected by the connection between the flap, the clamping and the fuse. At the same time, the threads are tightened with thread glue, which greatly improves the locking reliability of the locked parts.

[0005] For example, patent CN216951224U discloses a nut-screw assembly and locking device that resists loosening. In this application, the tapered protrusion of the first conical surface is pressed into the first inclined surface. The eccentric taper of the tightening rod changes the screw axis, resulting in a tight thread engagement, preventing the screw from rotating and loosening. The overall mortise and tenon structure combined with the eccentric taper prevents the screw and nut from rotating, thus preventing loosening.

[0006] The aforementioned applications all involve technical improvements to locknuts, effectively increasing their locking force, but still leave room for improvement. For example, in some operating conditions with high workloads, larger diameter bolts are often used, requiring larger locknuts to provide sufficient locking force to meet the high load requirements. In these cases, the larger bolts and the greater locking force required require larger hydraulic tensioners or hydraulic wrenches, which not only increases construction costs but also makes operating large hydraulic equipment quite inconvenient in confined spaces due to limited operating space. Utility Model Content

[0007] 1. Problems to be solved

[0008] In response to at least some of the problems existing in the above-mentioned prior art, the present invention proposes a decomposed preload locking nut, the purpose of which is to solve the problem that the existing large-sized locking nuts need to be used with large driving equipment, thereby increasing construction costs and limiting operations in small spaces.

[0009] 2. Technical solution

[0010] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0011] The utility model discloses a decomposable pre-tightening force locking nut, comprising a nut body with a central through hole, wherein the nut body is provided with a pre-tightening hole extending in the radial direction thereof on the circumference thereof, and the pre-tightening hole is equipped with a force applying rod for pre-tightening the nut body;

[0012] The nut body is provided with a plurality of annular and evenly distributed locking through holes along the axial direction. The locking through holes are equipped with locking bolts, and the two are threadedly connected for locking the nut body.

[0013] Furthermore, the nut body is cylindrical as a whole.

[0014] Furthermore, the locking bolt includes a threaded section for cooperating with the locking through hole thread, the top of the threaded section is a connecting portion cooperating with the output end of the driving member, and the bottom is an extrusion portion in contact with the surface of the workpiece.

[0015] Furthermore, the extrusion portion is a hemispherical structure.

[0016] Furthermore, a gasket is provided at the bottom of the nut body, and the extrusion portion contacts the upper surface of the gasket after passing through the locking through hole.

[0017] Furthermore, the hardness of the extrusion portion is greater than the hardness of the gasket.

[0018] Furthermore, the hardness of the extrusion part is HRC65-70; the hardness of the gasket is HRC55-65.

[0019] Furthermore, the surface roughness of the extrusion portion and the gasket is 0.6-0.8 Ra.

[0020] Furthermore, the driving member is any one of an electric wrench, a pneumatic wrench or a hydraulic wrench; and the connecting portion is an inner hole in the shape of a quadrilateral, a hexagon or a plum blossom dodecagon.

[0021] 3. Beneficial effects

[0022] Compared with the prior art, the beneficial effects of the present invention are:

[0023] (1) The utility model relates to a decomposable pre-tightening force locking nut, in which a radially extending pre-tightening hole and an axially extending locking through-hole are provided on the nut body. A force rod is inserted into the pre-tightening hole to drive the nut body to rotate, thereby realizing the pre-tightening operation of the nut body; then, the locking operation of the nut body can be realized by multiple locking bolts. The utility model decomposes the pre-tightening force locking nut, which can decompose a large locking force into multiple locking bolts; in this way, the locking force of a single locking bolt can be satisfied by a conventional electric wrench, without the need for additional large-scale driving equipment, which not only effectively reduces the investment cost of construction equipment, but also avoids the problem of large equipment being restricted in operation in a small space.

[0024] (2) The utility model provides a decomposition preload locking nut, in which the outer peripheral wall of the nut body adopts an annular design. Compared with conventional square nuts, when the nut body needs to rotate at high speed following the workpiece, the centrifugal force applied to the annular nut during the rotation process is more evenly distributed, thereby reducing the loosening phenomenon caused by uneven centrifugal force.

[0025] (3) The utility model provides a decomposition pre-tightening force locking nut, in which the extrusion portion of the locking bolt is a hemispherical structure, which can effectively reduce the friction between the two, thereby reducing the loss of driving force, so that the torque applied by the driving wrench can be converted into the locking force of the locking bolt to the greatest extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a structural diagram of a decomposing pre-tightening force locking nut of the utility model;

[0027] Figure 2 This is a top view of a decomposed pre-tightening force locking nut of the utility model;

[0028] Figure 3 for Figure 2 Cross-sectional view along the AA axis;

[0029] Figure 4 This is a schematic structural diagram of the nut body in the present utility model;

[0030] Figure 5 It is a structural schematic diagram of the locking bolt in the utility model.

[0031] In the figure: 1, nut body; 11, locking through hole; 12, pre-tightening hole;

[0032] 2. Locking bolt; 21. Threaded section; 22. Connecting portion; 23. Extrusion portion; 3. Gasket. DETAILED DESCRIPTION

[0033] In order to further understand the content of the present invention, the present invention is described in detail with reference to the accompanying drawings.

[0034] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] The present invention will be further described below in conjunction with specific embodiments.

[0036] like Figure 1-Figure 3 As shown, a decomposition preload locking nut of this embodiment includes a nut body 1 having a central through-hole at its center. The inner wall of the central through-hole is threaded to engage with the outer peripheral wall of the bolt to be connected. The nut body 1 is also provided with a preload hole 12 and a locking through-hole 11. The preload hole 12 is used for preloading the nut body 1, while the locking through-hole 11 is used for further locking the preloaded nut body 1.

[0037] Specifically, refer to Figure 4 As shown, the pre-tightening hole 12 is formed on the outer peripheral wall of the nut body 1 and extends radially along the nut body 1. The pre-tightening hole 12 is also equipped with a force rod (not shown in the figure); the force rod is inserted into the pre-tightening hole 12, and then drives the nut body 1 to rotate, thereby achieving the pre-tightening operation of the nut body 1.

[0038] A locking through-hole 11 is defined at the top of the nut body 1 and extends axially through the nut body 1 to the bottom thereof. A locking bolt 2 is positioned within the locking through-hole 11, threadedly engaging the locking through-hole 11. As the locking bolt 2 is tightened, the preload from the locking bolt 2 creates a counteracting tightening force on the nut body 1, thereby locking the nut body 1.

[0039] Preferably, a plurality of the locking through holes 11 and pre-tightening holes 12 are provided, and the plurality of locking through holes 11 are evenly distributed in a circular pattern along the top of the nut body 1 to ensure that the locking force of the locking bolt 2 on the nut body 1 is evenly distributed. It is also worth noting that when applying the locking force to the locking bolt 2, it should be tightened stepwise in a symmetrical sequence to ensure the ultimate locking effect.

[0040] Furthermore, the nut body 1 is cylindrical in shape as a whole. This is because compared to conventional square nuts, when the nut body 1 needs to rotate at high speed with the workpiece, the centrifugal force applied to the ring nut during rotation is more evenly distributed, thereby reducing loosening caused by uneven centrifugal force.

[0041] In addition, a washer 3 is provided at the bottom of the nut body 1 , and the washer 3 is used for being squeezed by the locking bolt 2 .

[0042] Specifically, in this embodiment, eight locking through holes 11 are provided, and four pre-tightening holes 12 are provided at equal intervals along the outer circumference of the locking through holes 11. Each pre-tightening hole 12 is a blind hole. Furthermore, the pre-tightening hole 12 is preferably located midway between the two locking through holes 11 to ensure the overall strength of the nut body 1.

[0043] like Figure 5 As shown, as an embodiment of the locking bolt 2, the locking bolt 2 includes a threaded section 21, the top of the threaded section 21 is a connecting portion 22, and the bottom is an extrusion portion 23. The threaded section 21 is used to threadably cooperate with the locking through hole 11. The connecting portion 22 is used to connect with a driving member, which is an electric wrench, a pneumatic wrench, a hydraulic wrench or other. The connecting portion 22 has an inner hole that cooperates with the output end of the driving member. The inner hole can be a quadrilateral, a hexagon or a plum blossom twelve-pointed shape. The extrusion portion 23 is used to extrude with the upper surface of the gasket 3 to transmit a reaction force to lock the nut body 1.

[0044] In this embodiment, the extrusion portion 23 adopts a hemispherical structural design to reduce the friction between it and the gasket 3 during rotation, thereby reducing the loss of driving force, so that the torque applied by the driving wrench can be converted into the locking force of the locking bolt 2 to the greatest extent.

[0045] At the same time, the hardness of the extrusion portion 23 needs to be slightly greater than the hardness of the gasket 3 to prevent damage to the extrusion portion 23. Preferably, the hardness of the extrusion portion 23 is HRC65-70; the hardness of the gasket 3 is HRC55-65.

[0046] In addition, the contact area between the extrusion portion 23 and the gasket 3 should be as smooth as possible to further reduce the friction loss between the two. Preferably, the surface roughness of the extrusion portion 23 and the gasket 3 is 0.6-0.8Ra, for example, 0.6Ra, 0.7Ra, 0.8Ra, etc.

[0047] The decomposition pre-tightening force locking nut of this embodiment is provided with a radially extending pre-tightening hole 12 and an axially extending locking through-hole 11 on the nut body 1. The force rod is inserted into the pre-tightening hole 12 to drive the nut body 1 to rotate, thereby realizing the pre-tightening operation of the nut body 1. Then, the locking operation of the nut body 1 can be realized by multiple locking bolts 2. The decomposition pre-tightening force locking nut of the utility model can decompose the larger locking force into multiple locking bolts 2; in this way, the locking force of a single locking bolt 2 can be satisfied by a conventional electric wrench, without the need for additional large-scale driving equipment, which not only effectively reduces the investment cost of construction equipment, but also avoids the problem of large equipment being restricted in operation in a small space.

[0048] The above is a schematic description of the present invention and its embodiments, which is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by this and, without departing from the inventive purpose of the present invention, designs a structure and embodiment similar to the technical solution without inventiveness, they shall fall within the scope of protection of the present invention.

Claims

1. A decomposition preload locking nut, comprising a nut body (1) having a central through hole, characterized in that: The nut body (1) is provided with a pre-tightening hole (12) extending in its radial direction on its circumference, and the pre-tightening hole (12) is equipped with a force rod for performing a pre-tightening operation on the nut body (1); The nut body (1) is provided with a plurality of annular and evenly distributed locking through holes (11) along the axial direction. The locking through holes (11) are equipped with locking bolts (2), and the two are threadedly connected for locking the nut body (1).

2. The decomposable preload lock nut according to claim 1, characterized in that: The nut body (1) is cylindrical in shape as a whole.

3. The decomposable preload locking nut according to claim 2, characterized in that: The locking bolt (2) includes a threaded section (21) for threadedly cooperating with the locking through hole (11), the top of the threaded section (21) is a connecting portion (22) cooperating with the output end of the driving member, and the bottom is an extrusion portion (23) in contact with the surface of the workpiece.

4. The decomposable preload lock nut according to claim 3, characterized in that: The extrusion portion (23) is a hemispherical structure.

5. A decomposable preload lock nut according to claim 3 or 4, characterized in that: The bottom of the nut body (1) is provided with a gasket (3), and the extrusion portion (23) contacts the upper surface of the gasket (3) after passing through the locking through hole (11).

6. The decomposable preload locking nut according to claim 5, characterized in that: The hardness of the extrusion portion (23) is greater than the hardness of the gasket (3).

7. The decomposable preload locking nut according to claim 6, characterized in that: The hardness of the extrusion portion (23) is HRC65-70; the hardness of the gasket (3) is HRC55-65.

8. The decomposable preload locking nut according to claim 5, characterized in that: The surface roughness of the extrusion portion (23) and the gasket (3) is 0.6-0.8 Ra.

9. The decomposable preload locking nut according to claim 3, characterized in that: The driving member is any one of an electric wrench, a pneumatic wrench or a hydraulic wrench; the connecting portion (22) is an inner hole in the shape of a quadrilateral, a hexagon or a twelve-cornered plum blossom.

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