CN218207417U

CN218207417U - Nut structure capable of preventing loosening

Info

Publication number: CN218207417U
Application number: CN202222351404.8U
Authority: CN
Inventors: 张裕; 谢益君
Original assignee: Hunan Runtian Machinery Manufacturing Co ltd
Current assignee: Hunan Runtian Machinery Manufacturing Co ltd; Hunan Runtian Zhike Equipment Manufacturing Co ltd
Priority date: 2022-09-05
Filing date: 2022-09-05
Publication date: 2023-01-03
Anticipated expiration: 2032-09-05

Abstract

The utility model discloses a nut structure for preventing looseness, wherein the upper end of a main nut is provided with an inward bent cone, and the cone is a structure that a plurality of groups of cutting grooves are longitudinally and uniformly arranged on an annular round platform; the inner side of the lower portion of the locking nut is provided with an inner conical surface, the diameter of the top of the inner conical surface is smaller than that of the upper end face of the cone, and the diameter of the bottom of the inner conical surface is larger than that of the lower end face of the cone. The utility model discloses when lock nut screwed down, lock nut's interior conical surface and main nut's the outer conical surface pressfitting because there is the tool withdrawal groove main nut's cone below, it has a little elastic deformation ability, and under conical effect, four lamellas cones can be tightly from holding the bolt tightly on every side to reach the locking purpose of locking.

Description

Nut structure capable of preventing loosening

Technical Field

The utility model relates to a mechanical fixing device technical field especially relates to a prevent nut structure that becomes flexible.

Background

The nut and the bolt are mechanical fixing pieces with wide application. When a common nut is matched with a bolt to fix a mechanical part, the time is long due to mechanical movement or vibration, and the nut is easy to loosen and fall off, so that a fixed part is displaced or loosened. Common solutions are to add spring washers, tooth washers, etc. to increase the friction, or other solutions. Damage to mechanical parts may occur on a light basis and failure or accident may occur on a heavy basis.

In the prior art, some nut structures are composed of two nuts, a main nut is provided with an eccentric outer cone and locked with an inner cone (without eccentricity), the main nut is firstly screwed on a bolt in place, and then the locking nut is screwed in. When the locking nut is screwed down, the inner cone can contact one side of the eccentric outer cone of the main nut, the main nut is compressed by the wedge, side pressure is formed on the opposite side faces of the two nuts and the bolt, friction force is increased between the nuts and the bolt, and therefore the purpose of preventing looseness is achieved. However, the anti-loose structure in the prior art has extremely high requirements on materials, processing and heat treatment. The eccentric outer conical surface of the main nut is in line contact with the inner conical surface of the locking nut theoretically, and the actual local pressure is extremely high. If the material, the processing precision and the like of the nut do not meet the requirements, when the nut is installed and used again, the contact part is easy to deform, so that the failure is caused, and the taper and the eccentric amount of nuts with various specifications are designed properly so as to play the best effect. Therefore, the development of a nut assembly which is simple in structure and easy to machine is a direction for further improvement.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a prevent not hard up nut structure.

The utility model provides a following technical scheme: a nut structure for preventing looseness comprises a main nut and a locking nut, wherein the main nut and the locking nut are connected in a clamping mode, and a gap is formed between the main nut and the locking nut; the upper end of the main nut is provided with an inward bent cone, and the cone is of a structure that a plurality of groups of cutting grooves are uniformly formed in the annular circular truncated cone in the longitudinal direction; the inner side of the lower portion of the locking nut is provided with an inner conical surface, the diameter of the top of the inner conical surface is smaller than that of the upper end face of the cone, and the diameter of the bottom of the inner conical surface is larger than that of the lower end face of the cone.

Preferably, a tool withdrawal groove is formed between the lower end of the cone and the main nut, and the tool withdrawal groove is communicated with the cutting groove.

Preferably, the inner side of the cone is provided with threads.

Preferably, the cutting grooves are two or more groups.

Preferably, the locking nut is provided with a locking thread part on the inner side of the upper part.

Preferably, the cone, the inner conical surface and the locking screw portion are coaxially arranged.

Compared with the prior art, the utility model discloses following beneficial effect has:

(1) The utility model is provided with the inward bending cone on the upper end of the main nut, and the cone is a structure that a plurality of groups of cutting grooves are longitudinally and uniformly arranged on the annular round platform; the inner side of the lower portion of the locking nut is provided with an inner conical surface, the diameter of the top of the inner conical surface is smaller than that of the upper end face of the cone, the diameter of the bottom of the inner conical surface is larger than that of the lower end face of the cone, when the locking nut is screwed down, the inner conical surface of the locking nut is in press fit with the outer conical surface of the main nut, the tool withdrawal groove is arranged below the cone of the main nut and has elastic deformation capacity, and the four-segment cone can tightly hold the bolt from the periphery under the effect of taper, so that the purpose of locking and looseness prevention is achieved.

Drawings

Fig. 1 is an exploded view of the structure of the present invention.

Fig. 2 is a sectional view of the utility model in use.

Fig. 3 is a schematic diagram of a nut in the prior art.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

As shown in fig. 1 to 3, a nut structure for preventing loosening includes a main nut 1, a lock nut 2, a cone 3, a cutting groove 4, an inner tapered surface 5, a relief groove 6, a lock screw portion 7, and an outer tapered surface 8.

In the description of the present invention, "a plurality" means two or more unless otherwise specified; the terms "upper", "lower", "left", "right", "inner", "outer", "front", "rear", "head", "tail", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1 to 3, the main nut 1 and the lock nut 2 are connected in a clamping manner with a gap therebetween; the upper end of the main nut 1 is provided with an inward bent cone 3, and the inner side of the cone 3 is provided with threads; the cone 3 is a structure that a plurality of groups of cutting grooves 4 are longitudinally and uniformly formed on the annular circular truncated cone, and in the embodiment, more than two groups of cutting grooves 4 are formed; the inner side of the lower part of the locking nut 2 is provided with an inner conical surface 5, the diameter of the top of the inner conical surface 5 is smaller than that of the upper end surface of the cone 3, the diameter of the bottom of the inner conical surface 5 is larger than that of the lower end surface of the cone 3, and in the embodiment, the cone 3, the inner conical surface 5 and the locking thread part 7 are coaxially arranged.

A tool withdrawal groove 6 is arranged between the lower end of the cone 3 and the main nut 1, and the tool withdrawal groove 6 is communicated with the cutting groove 4.

The locking nut 2 is provided with a locking thread part 7 on the inner side of the upper part.

The utility model discloses a theory of operation does: when lock nut 2 screwed down, lock nut 2's interior conical surface 5 and main nut's the 8 pressfittings of the external conical surface, because there is tool withdrawal groove 6 below main nut 1's cone 3, it has some elastic deformation ability, can leave some clearances between main nut 1 and the lock nut 2, under tapered effect, the bolt is held tightly around the multi-disc cone 3 can be tight to reach the locking mesh, the utility model has the advantages of simple overall structure, easily processing, the locking principle is simple, uses reliably.

The above-mentioned embodiments are only preferred embodiments of the present invention, and the scope of the right of the present invention should not be limited thereby, and therefore, modifications, equivalent changes, improvements, etc. made in the claims of the present invention are still included in the scope of the present invention.

Claims

1. The utility model provides a prevent nut structure that becomes flexible which characterized in that: the nut locking device comprises a main nut (1) and a locking nut (2), wherein the main nut (1) is connected with the locking nut (2) in a clamping manner, and a gap is formed between the main nut (1) and the locking nut (2); the upper end of the main nut (1) is provided with an inward bent cone (3), and the cone (3) is of a structure that a plurality of groups of cutting grooves (4) are uniformly formed in the annular circular truncated cone in the longitudinal direction; the inner side of the lower portion of the locking nut (2) is provided with an inner conical surface (5), the diameter of the top of the inner conical surface (5) is smaller than that of the upper end face of the cone (3), and the diameter of the bottom of the inner conical surface (5) is larger than that of the lower end face of the cone (3).

2. A loosening prevention nut arrangement as claimed in claim 1, wherein: a tool withdrawal groove (6) is formed between the lower end of the cone (3) and the main nut (1), and the tool withdrawal groove (6) is communicated with the cutting groove (4).

3. A loosening prevention nut structure as claimed in claim 2, wherein: the inner side of the cone (3) is provided with threads.

4. A loosening prevention nut arrangement as claimed in claim 2, wherein: the cutting grooves (4) are more than two groups.

5. A loosening prevention nut structure as claimed in claim 1, wherein: and a locking thread part (7) is arranged on the inner side of the upper part of the locking nut (2).

6. A loosening prevention nut arrangement according to claim 5, wherein: the cone (3), the inner conical surface (5) and the locking thread part (7) are coaxially arranged.