Lock nut and assembly

Abstract

The utility model relates to the technical field of fasteners, in particular to a locknut and a locknut assembly, and aims to solve the problem that bolt connection is loosened due to impact, vibration, variable load, high temperature, temperature change, material creep and the like. The locknut provided by the utility model is sleeved on a bolt, is in threaded connection with the bolt, and comprises a nut body and a circular truncated cone part which are coaxially arranged, and the nut body is connected with the circular truncated cone part; the circular truncated cone part is inserted into a connecting through hole in the workpiece and abuts against the hole edge of the connecting through hole; the outer diameter of the circular truncated cone part is gradually reduced in the direction away from the nut body. According to the locknut, the nut body and the bolt are matched to apply axial pressure so that the circular truncated cone portion can abut against the hole edge of the connecting through hole in the workpiece, radial component force is generated by means of the inclined face of the circular truncated cone portion, and therefore static friction force is generated between the circular truncated cone portion and the connecting through hole, rotation between the circular truncated cone portion and the connecting through hole is prevented, and the service life of the locknut is prolonged. Loosening prevention is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of fasteners, in particular to a locknut and a component thereof. Background Art

[0002] In the prior art, the connection between workpieces is usually realized by the combination of bolts, gaskets and nuts. Under static load conditions, this connection method will not fall off automatically. However, the working conditions will inevitably involve impacts, vibrations and variable loads. Under these working conditions, the friction force between the thread pairs of this connection will disappear or decrease instantaneously. At the same time, in occasions with high temperature and large temperature changes, the material will creep and stress relax, which will also reduce the friction force. After multiple actions, the connection will become loose, resulting in safety accidents. Content of the Utility Model

[0003] The purpose of the utility model is to provide a locknut and a component thereof, so as to solve the problem that the bolt connection becomes loose due to impacts, vibrations, variable loads, high temperature, temperature changes and material creep.

[0004] In order to solve the above technical problems, the technical solution provided by the utility model is as follows:

[0005] A locknut is sleeved on a bolt and is in threaded connection with the bolt, and comprises a nut body and a frustum portion which are coaxially arranged, and the nut body is connected with the frustum portion;

[0006] The frustum portion is inserted into a connection through hole on a workpiece and abuts against the edge of the connection through hole;

[0007] The outer diameter of the frustum portion gradually decreases in the direction away from the nut body.

[0008] Furthermore, the maximum outer diameter of the frustum portion is greater than the diameter of the connection through hole, and the minimum outer diameter of the frustum portion is less than the diameter of the connection through hole.

[0009] Furthermore, the outer surface of the frustum portion is knurled.

[0010] Furthermore, the frustum portion comprises a knurled section and a smooth section; the maximum outer diameter of the knurled section is greater than the diameter of the connection through hole, the minimum outer diameter of the knurled section is less than the diameter of the connection through hole, and the maximum outer diameter of the smooth section is equal to the minimum outer diameter of the knurled section.

[0011] Furthermore, the nut body is provided with a threaded hole for threaded connection with the bolt;

[0012] The frustum portion is provided with a through hole, and the bolt passes through the through hole of the frustum portion and is in threaded connection with the threaded hole of the nut body.

[0013] Furthermore, the locknut further includes a transition portion, one end of the transition portion is connected to the nut body, and the other end is connected to the frustum portion;

[0014] A relief groove is provided on the transition portion.

[0015] Furthermore, the relief groove is smoothly transitioned with the nut body and the frustum portion and is provided in an arc shape.

[0016] Furthermore, the locknut is made of a steel material with a carbon content of not less than 45 steel.

[0017] On the other hand, the present utility model proposes a locknut assembly, which includes the above-mentioned locknut, and further includes a bolt. The bolt sequentially passes through a workpiece, the frustum portion and the nut body and is threadedly connected to the nut body.

[0018] Furthermore, the locknut assembly further includes an elastic washer. The elastic washer is sleeved on the bolt, one end abuts against the nut body, and the other end abuts against the workpiece.

[0019] Combining the above technical solutions, the technical effects that the present utility model can achieve are as follows:

[0020] The locknut provided by the present utility model is sleeved on a bolt and is threadedly connected to the bolt. It includes a nut body and a frustum portion arranged coaxially, and the nut body is connected to the frustum portion; the frustum portion is inserted into a connection through hole on a workpiece and abuts against the edge of the connection through hole; the outer diameter of the frustum portion gradually decreases in a direction away from the nut body.

[0021] The locknut provided by the present utility model applies an axial pressure through the cooperation of the nut body and the bolt to make the frustum portion abut against the edge of the connection through hole on the workpiece, and generates a radial component force by means of the inclined surface of the frustum portion, so as to generate a static friction force between the frustum portion and the connection through hole, preventing rotation between the frustum portion and the connection through hole and realizing anti-loosening. In addition, after screwing together, the frustum portion will cause extrusion damage to the edge of the connection through hole, forming a meshing effect and changing from line contact to surface contact, further improving the anti-loosening effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic structural diagram of the locknut provided by the embodiment of the present utility model;

[0024] Figure 2 This is a schematic structural view of the locknut assembly provided by an embodiment of the present utility model.

[0025] Icon: 100, nut body; 200, frustum portion; 300, transition portion; 210, knurled section; 220, smooth section; 310, relief groove; 20, bolt; 30, workpiece. Specific embodiments

[0026] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. Generally, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0027] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model claimed, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0028] The following will describe in detail some embodiments of the present utility model with reference to the accompanying drawings. Without conflict, the following embodiments and the features in the embodiments can be combined with each other.

[0029] The prior art usually uses a combination of bolts, gaskets, and nuts to achieve the connection between workpieces. Under static load conditions, this connection method will not automatically come off. However, under actual working conditions, impacts, vibrations, and variable loads will inevitably exist. Under these working conditions, the friction force between the thread pairs of this connection will disappear or decrease instantaneously; at the same time, in occasions with high temperature and large temperature changes, the material will creep and stress-relax, which will also reduce the friction force. After multiple actions, the connection will become loose, resulting in safety accidents.

[0030] In view of this, the present utility model provides a locknut, which is sleeved on the bolt 20 and is threadedly connected to the bolt 20, and includes a nut body 100 and a frustum portion 200 arranged coaxially. The nut body 100 is connected to the frustum portion 200; the frustum portion 200 is inserted into the connection through hole on the workpiece 30 and abuts against the edge of the connection through hole; the outer diameter of the frustum portion 200 gradually decreases in the direction away from the nut body 100.

[0031] The locknut provided by the utility model applies axial pressure through the cooperation of the nut body 100 and the bolt 20, so that the frustum 200 abuts against the edge of the connecting through hole on the workpiece 30, and generates a radial component force by means of the inclined surface of the frustum 200, thereby generating a static friction force between the frustum 200 and the connecting through hole, preventing rotation between the frustum 200 and the connecting through hole, and realizing anti-loosening. In addition, after screwing together, the frustum 200 will cause extrusion damage to the edge of the connecting through hole, forming a meshing effect and changing from line contact to surface contact, further improving the anti-loosening effect.

[0032] The following combines Figure 1 、 Figure 2 to describe in detail the structure and shape of the locknut provided in this embodiment:

[0033] In this embodiment, the locknut includes a nut body 100, a transition portion 300, and a frustum 200 connected in sequence, as Figure 1 shown.

[0034] Specifically, the nut body 100 has the same structure as a common nut, and is provided with a threaded hole and an external hexagon to realize threaded connection with the bolt 20 and facilitate screwing and fastening. The outer diameter of the frustum 200 gradually decreases in the direction away from the nut body 100, and the maximum outer diameter of the frustum 200 is greater than the diameter of the connecting through hole, and the minimum outer diameter of the frustum 200 is less than the diameter of the connecting through hole, so as to ensure that the inclined surface of the frustum 200 abuts against the edge of the connecting through hole.

[0035] In this embodiment, the transition portion 300 is used to smoothly connect the nut body 100 and the frustum 200. Specifically, the transition portion 300 has a smooth transition at the connection with the nut body 100 and the frustum 200, that is, the transition portion 300 is tangent to the end faces of the nut body 100 and the frustum 200, thereby reducing stress concentration and improving service life.

[0036] In this embodiment, in order to facilitate the machining of the frustum 200, a relief groove 310 is provided on the transition portion 300. The relief groove 310 has a smooth transition with the nut body 100 and the frustum 200 and is set to be arc-shaped, as Figure 1 shown. That is, the relief groove 310 is set as an annular groove with a U-shaped semicircular cross-section, and the semicircle is tangent to the end faces of the nut body 100 and the frustum 200.

[0037] In this embodiment, to increase the friction between the frustum part 200 and the connecting through-hole and prevent the locknut from rotating relative to the workpiece 30, the outer surface of the frustum part 200 is knurled. Specifically, the frustum part 200 includes a knurled section 210 and a smooth section 220; the maximum outer diameter of the knurled section 210 is greater than the diameter of the connecting through-hole, the minimum outer diameter of the knurled section 210 is less than the diameter of the connecting through-hole, and the maximum outer diameter of the smooth section 220 is equal to the minimum outer diameter of the knurled section 210. That is, the outer surface of the knurled section 210 is knurled for anti-loosening connection, and the smooth section 220 is used for guiding to make the screwing process of the locknut and the bolt 20 smooth.

[0038] After knurling, the extrusion and destruction effect of the knurled section 210 on the edge of the connecting through-hole is more obvious, and the meshing effect is stronger, significantly improving the anti-loosening effect.

[0039] In this embodiment, the nut body 100 is provided with a threaded hole for threaded connection with the bolt 20; both the frustum part 200 and the transition part 300 are provided with through-holes for the bolt 20 to pass through. After the bolt 20 passes through the through-holes of the frustum part 200 and the transition part 300, it is threadedly connected with the threaded hole of the nut body 100. Since the thickness and diameter of the frustum part 200 and the transition part 300 are relatively small, the frustum part 200 and the transition part 300 are not machined with threaded holes, but only provided with smooth holes to facilitate the passing of the bolt 20, so as to prevent deformation during use and prevent thread failure and structural damage.

[0040] The locknut provided in this embodiment is made of a steel material with a carbon content not less than 45 steel to ensure strength and stiffness and avoid connection loosening caused by deformation.

[0041] Based on the locknut proposed in this embodiment, a locknut assembly is proposed, which includes the above-mentioned locknut and also includes a bolt 20. The bolt 20 passes through the workpiece 30, the frustum part 200 and the nut body 100 in sequence and is threadedly connected with the nut body 100.

[0042] Furthermore, to improve the anti-loosening effect, the locknut assembly further includes an elastic washer. The elastic washer is sleeved on the bolt 20, with one end abutted against the nut body 100 and the other end abutted against the workpiece 30, so as to generate static friction between the nut body 100 and the elastic washer and between the elastic washer and the workpiece 30, further preventing the locknut from rotating around its own axis and improving the anti-loosening effect.

[0043] It should be noted that the thickness of the elastic washer needs to be controlled to prevent the frustum part 200 from not being able to effectively contact the connecting through-hole due to the too large thickness of the elastic washer.

[0044] In this embodiment, to increase the friction and connection stability between the frustum part 200 and the connection passage, the connecting through-hole is set as a tapered counterbore, and the taper of the taper is the same as that of the frustum part 200 to increase the contact area.

[0045] When the bolt 20 is screwed into the nut body 100, the inclination angle of the frustum portion 200 causes a radial pressure to be generated after its axial movement. This pressure cooperates with the knurling of the knurled section 210, effectively increasing the frictional force between the nut and the workpiece 30. At the same time, the biting and destruction of the knurled section 210 on the edge of the connecting through-hole changes the line contact between the two into surface contact, and realizes the meshing effect, thus realizing the self-locking function and achieving a lasting connection effect.

[0046] The locknut provided in this embodiment pays attention to the simplicity and practicality of the structure, and at the same time considers its working stability in a high-vibration environment. It is applicable to various industrial fields, such as automobiles, aviation, mechanical manufacturing, etc. It avoids the problem of thermal deformation caused by spot welding when a common nut is connected to the bolt 20 to achieve a permanent connection. Its unique self-locking characteristic can improve the safety and reliability of the connection.

[0047] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A locknut is sleeved on a bolt (20) and is threadedly connected to the bolt (20), characterized in that, It includes a nut body (100) and a frustum part (200) arranged coaxially, and the nut body (100) is connected to the frustum part (200); The frustum part (200) is inserted into a connection through-hole on a workpiece (30) and abuts against the edge of the connection through-hole; The outer diameter of the frustum part (200) gradually decreases in a direction away from the nut body (100).

2. The locknut according to claim 1, characterized in that, The maximum outer diameter of the frustum part (200) is greater than the diameter of the connection through-hole, and the minimum outer diameter of the frustum part (200) is less than the diameter of the connection through-hole.

3. The locknut according to claim 2, characterized in that, The outer surface of the frustum part (200) is knurled.

4. The locknut according to claim 3, characterized in that, The frustum part (200) includes a knurled section (210) and a smooth section (220); the maximum outer diameter of the knurled section (210) is greater than the diameter of the connection through-hole, the minimum outer diameter of the knurled section (210) is less than the diameter of the connection through-hole, and the maximum outer diameter of the smooth section (220) is equal to the minimum outer diameter of the knurled section (210).

5. The locknut according to claim 1, characterized in that, The nut body (100) is provided with a threaded hole for threaded connection with a bolt (20); The frustum part (200) is provided with a through-hole, and the bolt (20) passes through the through-hole of the frustum part (200) and is threadedly connected to the threaded hole of the nut body (100).

6. The locknut according to claim 1, characterized in that, It further includes a transition part (300), one end of the transition part (300) is connected to the nut body (100), and the other end is connected to the frustum part (200); A relief groove (310) is formed on the transition part (300).

7. The locknut according to claim 6, characterized in that, The relief groove (310) is smoothly transitioned with the nut body (100) and the frustum part (200) and is arranged in an arc shape.

8. The locknut according to claim 1, characterized in that, It is made of a steel material with a carbon content of not less than 45 steel.

9. A locknut assembly, characterized in that, It includes a locknut according to any one of claims 1-8, and further includes a bolt (20), and the bolt (20) sequentially passes through the workpiece (30), the frustum part (200) and the nut body (100) and is threadedly connected to the nut body (100).

10. The locknut assembly according to claim 9, wherein, It further includes an elastic washer, and the elastic washer is sleeved on the bolt (20), with one end abutting against the nut body (100) and the other end abutting against the workpiece (30).

Images