CN114776690A - An anti-loosening nut assembly - Google Patents

Abstract

The invention discloses an anti-loosening nut assembly, comprising a first nut and a second nut, wherein the first nut and the second nut cooperate to lock the bolt; the inner and outer walls of the first nut are provided with threads, and the inner threads and the outer The pitches of the threads are different; the second nut includes a second nut body, the inner wall of the second nut body is provided with a second-level thread, and the second-level thread includes a first-level thread and a second-level thread; the bolt, the first-level thread The internal thread of the nut and the first-level thread of the second nut have the same thread specifications, and the external thread of the first nut and the second-level thread of the second nut have the same thread specifications. After the first nut and the second nut of the present invention are connected, since the internal thread of the first nut and the external thread of the first nut have different thread regulations, the pressure and friction along the axial direction of the bolt make the two nuts clamped on the bolt, effectively preventing the nut Loose and fall off, with the advantages of high vibration resistance, light weight, and repeatable disassembly.

Description

An anti-loosening nut assembly

technical field

The invention relates to the technical field of anti-loosening devices, in particular to an anti-loosening nut assembly.

Background technique

Lock nut and self-tightening nut are a common tightening lock nut, including mechanical lock, riveting lock, friction lock, and structural lock. The commonly used self-locking and anti-loosening threaded fasteners mainly include the use of various self-locking bolts or ring groove rivets to achieve self-locking, and the addition of various spring washers to the threaded connection pair to achieve thread self-locking. Ordinary nuts are often loosened during use. Although there are anti-loosening nuts on the market, the anti-loosening effect is not reliable.

For example, the principle of the existing double nut locking is that after the two nuts are tightened, the axial force generated between the nuts increases the frictional force between the nut teeth and the bolt teeth to prevent the nuts from automatically loosening. But this type of double nut is subjected to the same force during vibration. Another example is the anti-loosening eccentric nut, which is divided into a concave nut and a convex nut. When installing, the convex nut is installed at the bottom first, and the concave nut is installed at the top. The eccentric processing used in the manufacture of the convex nut, the concave nut is a normal center circular process, when two convex and concave nuts are screwed together, it is like inserting a wedge in the nut, so as to prevent loosening. However, it is still prevented from loosening by the pressure friction between the concave nut and the convex nut, and the production cost is high and the economy is low.

SUMMARY OF THE INVENTION

In order to overcome the shortcomings of the prior art, the present invention aims to provide an anti-loosening nut assembly to solve the problems mentioned in the above background art.

To achieve the above object, the present invention adopts the following technical solutions:

An anti-loosening nut assembly, comprising a first nut and a second nut, the first nut and the second nut are matched to lock a bolt; the inner and outer walls of the first nut are provided with threads and the pitches of the inner thread and the outer thread are different The second nut includes a second nut body, the inner wall of the second nut body is provided with a secondary thread, and the secondary thread includes a first-level thread and a second-level thread; the inner thread of the bolt and the first nut The thread specifications of the first-level threads of the second nut are the same, and the thread specifications of the external threads of the first nut and the second-level threads of the second nut are the same.

Further, the first nut includes a first nut body and a locking portion provided with an external thread, the first nut body and the locking portion are integrally formed, and the outer diameter of the locking portion is smaller than that of the first nut body. outer diameter.

Further, the first nut body of the first nut and the second nut body of the second nut have the same outer diameter.

Further, the inner thread and the outer thread of the first nut have the same rotation direction.

Further, the thread specifications of the first nut and the second nut are standard threads.

Compared with the prior art, the beneficial effects of the present invention are as follows:

The present invention consists of a first nut and a second nut. The inside and outside of the first nut are provided with threads with different pitches, and the pitch of the inner thread of the second nut matches the pitch of the outer thread of the first nut. After the first nut and the second nut are connected, there will be a position difference between the inner thread and the outer thread of the first nut, and then the opposite tensile force and friction force will be generated along the axial direction of the bolt to clamp the two nuts. on the bolt. Because the connection pitch between the first nut and the second nut is different, the connection pitch between the first nut, the second nut and the bolt is different, the direction of the push force between the nuts is different, and the ability to resist vibration stress is stronger.

The invention can effectively reduce and prevent the economic loss and accident damage caused by the loosening of the nut during use.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, which are not relevant to ordinary skills in the field. As far as personnel are concerned, other drawings can also be obtained from these drawings on the premise of no creative work.

FIG. 1 is an overall cross-sectional view of the present invention.

2 is a cross-sectional view of the first nut of the present invention.

3 is a cross-sectional view of the second nut of the present invention.

In the figure, the reference signs are:

1-bolt; 2-first nut; 21-first nut body; 22-internal thread; 23-external thread; 3-second nut; 31-second nut body; Secondary thread.

Detailed ways

In order to illustrate the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and the accompanying drawings. Those skilled in the art should understand that the content specifically described below is illustrative rather than restrictive, and should not limit the protection scope of the present invention.

In the description of the present invention, it should be noted that the orientations or positional relationships indicated by the terms "inside", "outside", "upper", "lower", etc. are based on the orientations or positional relationships shown in the accompanying drawings, only for the purpose of It is convenient to describe the present invention and to simplify the description, rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. In addition, unless otherwise expressly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense, for example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection, It can also be an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or an internal connection between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

Example:

As shown in FIGS. 1-3 , an anti-loosening nut assembly includes a first nut 2 and a second nut 3 , and the first nut 2 and the second nut 3 cooperate to lock the bolt 1 . Likewise, in order to facilitate the use of existing standard bolts, the thread specifications of the first nut 2 and the second nut 3 are both standard threads.

The inner and outer walls of the first nut 2 are provided with threads, and the pitches of the inner thread 22 and the outer thread 23 are different; the second nut 3 includes a second nut body 31, and the inner wall of the second nut body 31 is provided with secondary threads, Including the first-level thread 32 and the second-level thread 33; the thread specifications of the bolt 1, the inner thread 22 of the first nut 2, and the first-level thread 32 of the second nut 3 are the same, and the outer thread 23 of the first nut 2, the first thread The thread specifications of the second thread 33 of the two nuts 3 are the same. In this design, the second nut 3 and the first nut 2 can be further locked on the bolt 1 to generate pressure and friction along the axial direction of the bolt, so that the two nuts are clamped on the bolt, effectively preventing the nuts from loosening Falling off occurs.

The first nut 2 includes a first nut body 21 and a locking portion provided with an external thread 23. The first nut body 21 and the locking portion are integrally formed, and the contact portion of the first nut 2 and the second nut 3 is the locking portion. , the outer diameter of the locking portion is smaller than the outer diameter of the first nut body 21 . The outer diameters of the first nut body 21 of the first nut 2 and the second nut body 31 of the second nut 3 are the same.

In addition, the inner thread 22 and the outer thread 23 of the first nut 2 are rotated in the same direction, which prevents the first nut 2 from retreating from the bolt 1 when the second nut 3 is screwed onto the first nut 2 .

Obviously, the above-mentioned embodiments of the present invention are only examples for illustrating the present invention more clearly, rather than limiting the embodiments of the present invention. For those of ordinary skill in the art, on the basis of the above descriptions, Changes or changes in other different forms are made, and all implementation methods cannot be exhaustively listed here, and all obvious changes or changes derived from the technical solutions of the present invention are still within the protection scope of the present invention.

Claims (5)

1. An anti-loosening nut assembly, characterized in that it comprises a first nut and a second nut, and the first nut and the second nut cooperate to lock the bolt; the inner and outer walls of the first nut are provided with threads and internal threads. The pitch is different from that of the external thread; the second nut includes a second nut body, the inner wall of the second nut body is provided with a second-level thread, and the second-level thread includes a first-level thread and a second-level thread; the bolt, The internal thread of the first nut and the first-level thread of the second nut have the same thread specification, and the external thread of the first nut and the second-level thread of the second nut have the same thread specification. 2. An anti-loosening nut assembly according to claim 1, wherein the first nut comprises a first nut body and a locking portion provided with an external thread, the first nut body and the locking portion It is integrally formed, and the outer diameter of the locking portion is smaller than the outer diameter of the first nut body. 3 . The anti-loosening nut assembly according to claim 2 , wherein the first nut body of the first nut and the second nut body of the second nut have the same outer diameter. 4 . 4 . The anti-loose nut assembly according to claim 1 , wherein the inner thread and the outer thread of the first nut have the same rotation direction. 5 . 5 . The anti-loosening nut assembly according to claim 1 , wherein the thread specifications of the first nut and the second nut are standard threads. 6 .

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