CN216768062U - Fastening and anti-loosening device for threaded connection - Google Patents

Abstract

The invention relates to a fastening and anti-loosening device for threaded connection. Is characterized by comprising two parts, wherein the two parts are respectively provided with an internal thread, a thread-free rotating surface, an external thread and a thread-free rotating surface, and 0 or more convex balls, depressions, ribs and grooves can be arranged on the thread-free rotating surfaces of the two parts; the external thread is connected with the internal thread, under the action of axial thrust generated by thread transmission, a tight fit is formed between the two thread-free rotating surfaces to generate friction force, or the surfaces deform or convex balls arranged on the surfaces sink into the concave parts, and the ribs sink into the grooves to block relative movement between the two parts. The threaded connection product designed and manufactured according to the invention achieves new technical effects, can reliably and effectively avoid the occurrence of the phenomenon of loosening of threaded connection, has outstanding substantive characteristics and remarkable progress in the aspects of fastening and loosening prevention by using a nut and a bolt, and has creativity.

Description

Fastening and anti-loosening device for threaded connection

Technical Field

The invention relates to the technical field of connecting pieces, in particular to a fastening and anti-loosening device for threaded connection.

Background

The screw thread is the main tie of all hardware connections at present, and current threaded connection does not fasten for a long time and will have not hard up phenomenon, and threaded connection is easily become flexible when receiving external force impact especially, causes equipment trouble. The anti-loosening method of the threaded connection at the present stage mainly adopts a gasket or double nut screwing mode, so that the long-time anti-loosening requirement under the condition of continuous impact is difficult to meet, and the loosening condition often occurs.

SUMMERY OF THE UTILITY MODEL

In view of the above, in order to overcome the defects of the prior art, the invention provides a fastening and anti-loosening method for threaded connection, which can effectively solve the problem that the existing threaded connection only using one nut is not fastened for a long time or is easy to loosen due to external force impact.

In order to solve the technical problem, the technical scheme of the invention is as follows: a fastening and anti-loosening device for threaded connection comprises a part A provided with an internal thread 8 and a thread-free rotating surface 7, and a part B provided with an external thread 1 and a thread-free rotating surface 2;

specifically, when the part a is assembled to the part B, the unthreaded rotary surface 2 is arranged outside the part B, and the unthreaded rotary surface 2 is inserted inside the unthreaded rotary surface 7 of the part a; the thread-free rotating surface 2 is arranged in the part B and is an inner hole surface, and the thread-free rotating surface 7 of the part A is inserted into the thread-free rotating surface 2 of the part B;

further, when the part A is assembled to the part B, the external thread 1 of the part B is firstly connected with the internal thread 8 of the part A to form a thread pair, the part A is continuously screwed, under the action of axial thrust generated by thread transmission, the thread-free rotating surface 7 of the part A and the thread-free rotating surface 2 of the part B form tight fit to generate friction force, or a convex ball which is deformed through a surface or is arranged on the thread-free rotating surface is sunk into a concave part, and a rib is sunk into a groove to block the relative motion of the part A and the part B, so that the loosening phenomenon of the two thread connections is avoided.

According to the design disclosed by the invention, the manufactured threaded fastening and anti-loosening product achieves a new technical effect, can effectively avoid the occurrence of the phenomenon of threaded connection loosening, is more superior to the prior threaded connection which is not provided with the rotating surface and related structures to block the relative motion between the threads of the threaded connection, is more reliable than the prior method of preventing the threaded connection from loosening by using a spring gasket and the like, has outstanding substantive characteristics and remarkable progress in the aspect of fastening and loosening prevention by using one nut, and has creativity.

A fastening, anti-loosening device for threaded connections, characterized in that it comprises:

the part A is provided with an internal thread section 8 and a thread-free rotating surface 7;

part B, part B is provided with external screw thread section 1, no screw thread surface of revolution 2.

Preferably, the fastening and anti-loosening device for threaded connection is described above, wherein the unthreaded rotary surface 7 of the part a can be a cylindrical surface, a circular table surface or a hemispherical surface.

Preferably, the fastening and anti-loosening device for threaded connection is described above, wherein the thread-free rotating surface 7 and the thread 8 of the part a can be arranged non-coaxially.

Preferably, the fastening and anti-loosening device for threaded connection is described above, wherein the external shape of the thread-free rotating surface 7 of the part a can be different from the external shape of the threaded segment 8.

Preferably, in the fastening and anti-loosening device for threaded connection, the part a has a thread-free rotation surface 7, and 0 or more open grooves 12 may be formed in a radial direction perpendicular to the thread-free rotation surface.

Preferably, the fastening and anti-loosening device for threaded connection is characterized in that one end face of the part a can be set to be a closed end face.

Preferably, the fastening and anti-loosening device for threaded connection is provided with grooves, recesses, convex balls 21 and ribs 20 on the unthreaded rotating surface 7 of the part a.

Preferably, the threaded fastening and anti-loosening device described above, wherein the end of the part B that is first inserted into the part a can be provided with a guiding chamfer 3.

Preferably, the fastening and anti-loosening device for threaded connection is described above, wherein the unthreaded rotary surface 2 of the part B can be a cylindrical surface, a circular truncated cone surface or a hemispherical surface.

Preferably, the fastening and anti-loosening device for threaded connection is characterized in that the thread-free rotating surface 2 of the part B can be arranged non-coaxially with the thread 1 of the part B.

Further, the fastening and anti-loosening device for threaded connection is characterized in that the unthreaded rotary surface 2 of the part B can be provided with a plane 6, a groove 13, a recess, a convex ball 21 and a rib 20.

Compared with the prior art, the invention has the following technical effects: simple structure, manufacturing process is simple, low in manufacturing cost, above-mentioned part A unthreaded rotating surface 7 with above-mentioned bolt B unthreaded rotating surface 2 local or whole tight fit that forms produces frictional resistance, or through the face deformation or the protruding ball that sets up on it between two unthreaded rotating surfaces sunken, the rib is absorbed in the recess, can effectively hinder part A with relative motion between part B, the reliable emergence that prevents threaded connection not hard up phenomenon.

Further, above-mentioned part A no screw thread surface of revolution 7 with 8 disalignment settings of screw thread, screw up above-mentioned part A after, above-mentioned part A internal thread 8 and above-mentioned part B1 disalignment of external screw thread has partial screw thread can extrude each other to increase frictional force effectively hinders part A with part B's relative motion effectively prevents the emergence of threaded connection not hard up phenomenon.

Drawings

FIG. 1: the assembly structure of embodiment 1 of the invention is schematically shown;

FIG. 2: the bolt B in embodiment 2 of the invention has a schematic three-dimensional structure;

FIG. 3: the cross-sectional structure of the bolt B in the plane position passing through the axis is shown in the figure in embodiment 2 of the invention;

FIG. 4: the nut A of embodiment 2 of the invention has a schematic three-dimensional structure;

FIG. 5: the sectional structure of the nut A in the plane position passing through the axis is shown in the figure in embodiment 2 of the invention;

FIG. 6: the assembly structure of embodiment 3 of the invention is shown schematically;

FIG. 7: the bolt B of embodiment 3 of the invention has a schematic three-dimensional structure;

FIG. 8: a schematic cross-sectional structure view of a bolt B of embodiment 3 of the present invention at a plane position passing through an axis;

FIG. 9: the nut A of embodiment 3 of the invention has a schematic three-dimensional structure;

FIG. 10: the sectional structure of the nut A in the plane position passing through the axis is shown in the figure in embodiment 3 of the invention;

FIG. 11: an assembled and exploded perspective view of embodiment 4 of the present invention;

FIG. 12: a nut a of embodiment 4 of the invention in a perspective view;

FIG. 13: the sectional structure of the nut A in the plane position passing through the axis is shown in the figure in embodiment 4 of the invention;

FIG. 14: a perspective view of a part C provided with a threadless surface of revolution fixed to a nut a according to embodiment 4 of the present invention;

FIG. 15: a schematic cross-sectional structure view of a part C of embodiment 4 of the present invention, which is fixed to a nut a and is provided with a thread-free rotation surface, at a position of a plane passing through an axis;

FIG. 16: the assembly structure of embodiment 4 of the invention is shown schematically;

FIG. 17: the assembly cross-sectional structure of the plane position passing through the axis is schematic in embodiment 4 of the invention;

FIG. 18: an assembled and exploded perspective view of embodiment 5 of the present invention;

FIG. 19: the assembly structure of embodiment 5 of the invention is schematically shown;

FIG. 20: the assembly cross-sectional structure of the embodiment 20 of the invention at the position of a plane passing through an axis is schematic;

FIG. 21: a perspective view of a part C of embodiment 5 of the present invention provided with a threadless surface of revolution fixed to a nut a;

FIG. 22: the part C provided with a non-threaded rotating surface fixed to the nut a of embodiment 5 of the present invention is a schematic cross-sectional structure view at a position of a plane passing through the axis.

Description of the reference numerals

Part A …, nut

B … part B, bolt, screw

1 … part B, bolt and external screw thread of screw

2 … part B, bolt, no-thread rotary surface of screw

3 … part B, bolt, screw non-thread rotary surface guiding chamfer

4 … part B, bolt, screw non-screw rotary surface central axis

5 … part B, bolt, external thread central axis of screw rod

6 … flat surface on the unthreaded rotary surface of part B, bolt, screw

7 … part A, internal threadless surface of revolution of nut

8 … part A, internal thread of nut

9 … part A, inner unthreaded surface of rotation axis of nut

10 … part A, internal thread axis of nut

11 … part A, bolt or screw insertion end of nut

12 … part A, open groove radially arranged on the unthreaded rotary surface of a nut

13 … grooves on the non-threaded surface of revolution of part B, bolt, screw

C … part with unthreaded swivel surface attached to part a or nut made separately in examples 4 and 5

14 … surface of revolution without screw thread of part C fixed to part a or nut made separately in examples 4 and 5

15 … Axis of unthreaded rotary surface of part C fixed to part A or nut separately made in examples 4 and 5

16 … inner race of part C fixed to part a or nut made separately in examples 4 and 5

17 … external ring groove for fixing part C of part A or nut in embodiments 4 and 5

18 … open groove for part A or nut for fixing part C in examples 4 and 5

19 … location for forming tight fit in examples 4 and 5

20 … raised ribs on the unthreaded rotary surface 14 of part C in example 5

21 … convex ball on the unthreaded rotary surface 14 of part C in example 5

Detailed Description

The following detailed description of the present invention is provided to facilitate the understanding and appreciation of the technical aspects of the present invention in connection with the accompanying drawings.

(example 1)

A fastening, anti-loosening device for threaded connection, in this embodiment:

the part A is a nut A, the part B is a bolt B, a threaded section 8 and a non-threaded rotating surface 7 are arranged in the nut A, and as shown in figures 4 and 5, convex balls, concave parts, ribs and groove features can be arranged on the non-threaded rotating surface 7 of the nut A;

on the outer cylindrical surface of the screw rod of the bolt B, a non-threaded rotating surface 2 and an external threaded section 1 are sequentially arranged from the end surface far away from the bolt head to the bolt head at the other end, as shown in figures 2 and 3, or the external threaded section 1 and the non-threaded rotating surface 2 are sequentially arranged from the end surface far away from the bolt head to the bolt head at the other end, and convex balls, concave pits, ribs and groove features can be arranged on the non-threaded rotating surface 2 of the screw rod;

specifically, after nut A is screwed on bolt B, under the effect of the generated axial thrust of screw drive, two unthreaded rotating surfaces form a tight fit, follow unthreaded rotating surfaces produce frictional resistance, or protruding ball, sunken, rib, recess characteristic that set up on through the face deformation or face between two unthreaded rotating surfaces, protruding ball is absorbed in sunken, and the rib is absorbed in the recess, hinders relative motion between nut A and bolt B, prevents the emergence of nut A bolt B connection not hard up phenomenon.

As shown in fig. 1, a fastening and anti-loosening device for threaded connection comprises:

the nut A is internally provided with a threaded section 8 at one end and a non-threaded rotating surface 7 at the other end, as shown in figures 4 and 5;

the bolt B is provided with a guide chamfer 3, a non-threaded rotating surface 2 and an external thread section 1 in sequence from the end surface far away from the bolt head to the bolt head at the other end of a screw rod of the bolt B, as shown in figures 2 and 3;

the non-thread rotating surface 2 of the screw rod of the bolt B is inserted into the nut A from the threaded end 11 of the nut A, penetrates through the nut threaded section 8, and is continuously screwed up, under the action of axial thrust generated by thread transmission, the non-thread rotating surface 2 of the screw rod of the bolt B and the non-thread rotating surface 7 of the nut A form tight fit, or a convex ball arranged on the surface or between the two non-thread rotating surfaces is sunk into a concave through surface deformation, a rib is sunk into a groove to block relative movement of the nut A relative to the bolt B, and the nut A is continuously screwed up until the end surface 11 of the nut A tightly presses a workpiece to reach a required pre-tightening degree.

(iii) example 2

As shown in fig. 2, in addition to the above structure, the non-threaded rotation surface 2 of the screw of the bolt B is provided with 0 or more flat surfaces 6, so that the contact area between the two non-threaded rotation surfaces 2 and 7 is reduced, thereby achieving the purpose of adjusting the frictional resistance generated on the two non-threaded rotation surfaces and adjusting the torque force required for tightening the nut a.

Further, in addition to the above-described structure, as shown in fig. 3, the axis 4 of the unthreaded rotation surface 2 of the screw of the bolt B and the axis 5 of the thread 1 of the screw of the bolt B are not coaxially provided; as shown in fig. 5, the axis 9 of the unthreaded rotary surface 7 of the nut a is not coaxial with the axis 10 of the thread 8 of the nut a; after the nut A is screwed down, the thread 8 of the nut A is not coaxial with the thread 1 of the bolt B, and the mutual extrusion force between partial threads is increased, so that the friction resistance is increased, the relative movement between the nut A and the bolt B is blocked, and the nut loosening phenomenon is prevented.

EXAMPLE 3

As shown in fig. 6, in addition to the above-described structure, as shown in fig. 7, 0 or more open grooves 13 are provided on the unthreaded rotating surface 2 of the shank of the bolt B; as shown in fig. 9, 0 or more open grooves 12 are provided on the unthreaded rotary surface 7 of the nut a; the contact area between the two unthreaded rotating surfaces 2 and 7 is reduced, and the tightening force of the tight fit between the two unthreaded rotating surfaces 2 and 7 is adjusted, so that the purposes of adjusting the friction resistance generated on the two unthreaded rotating surfaces 2 and 7 and adjusting the torque force required by screwing the nut are achieved.

Further, in addition to the above configuration, as shown in fig. 8, the axis 4 of the unthreaded rotation surface 2 of the screw of the bolt B and the axis 5 of the thread 1 of the screw of the bolt B are coaxially provided; as shown in fig. 10, the axis 9 of the unthreaded rotary surface 7 of the nut a is not coaxial with the axis 10 of the thread 8 of the nut a; after the nut A is screwed down, the thread 8 of the nut A and the thread 1 of the bolt B are not coaxial, and the mutual extrusion force between partial threads is increased, so that the friction resistance is increased, the relative motion between the nut A and the bolt B is blocked, and the nut loosening phenomenon is avoided.

(example 4)

As shown in fig. 11, 16, and 17, this embodiment is basically similar in structure and principle to embodiments 1, 2, and 3 described above, except that: the non-threaded surface of revolution 7 in the nut a, which cooperates with said non-threaded surface of revolution 2 on the shank of the bolt B, is provided as a part C (see fig. 14, 15) and is fixed to the outer annular groove 17 and the open groove 18 on the nut a (see fig. 12 and 13) by means of the inner annular groove 16 on the part C, which is assembled with the nut a to form a whole, and the non-threaded surface of revolution 14 on the part C forms a tight fit 19 with said non-threaded surface of revolution 2 on the shank of the bolt B, as shown in fig. 17.

(example 5)

As shown in fig. 18, 19 and 20, the present embodiment is basically similar to the structure and principle of embodiment 4, and differs therefrom in that: the part C is provided with a plurality of convex balls 21 or convex ribs 20 (as shown in figures 21 and 22) on the non-threaded rotating surface 14 matched with the non-threaded rotating surface 2 on the screw rod of the bolt B, and the non-threaded rotating surface 14, the convex balls 21 and the ribs 22 in the part C are tightly matched with the non-threaded rotating surface 2 on the screw rod of the bolt B or are sunk into the grooves 13 or the recesses on the part C to block the relative movement between the nut and the bolt

Of course, the above is only a typical example of the present invention, and besides, the present invention can have other embodiments, and all the technical solutions formed by using equivalent substitutions or equivalent transformations fall within the scope of the present invention.

Claims (4)

1. A fastening and anti-loosening device for threaded connection is characterized by comprising:

the part A is provided with an internal thread and a thread-free rotating surface, 0 or more convex balls, depressions, ribs and grooves can be arranged on the thread-free rotating surface of the part A, and the internal thread and the thread-free rotating surface can be arranged non-adjacently;

the part B is provided with an external thread and a non-threaded rotating surface, 0 or more convex balls, depressions, ribs and grooves can be arranged on the non-threaded rotating surface, and the external thread and the non-threaded rotating surface can be arranged non-adjacently;

the external thread of the part B is inserted into the internal thread of the part A to form a thread pair, and a tight fit is formed between the two thread-free rotating surfaces, partially or completely to generate friction force, or the surfaces deform or convex balls arranged on the surfaces sink into the grooves, and ribs sink into the grooves to block relative movement between the part A and the part B under the action of axial thrust generated by thread transmission.

2. A fastening/loosening prevention device for screw connection according to claim 1, wherein 0 or more open grooves are provided in the unthreaded rotation surface of part a in a radial direction perpendicular to the unthreaded rotation surface, for adjusting the tightening force of the unthreaded rotation surface of part a against the unthreaded rotation surface of part B.

3. A screw-threaded fastening and anti-loosening device according to any one of claims 1 to 2, wherein the unthreaded rotary surface and the internal thread of part a can be separately formed, assembled and fixed together.

4. A fastening and loosening preventing device for screw connection according to any of claims 1 to 2, wherein the unthreaded rotary surface and the external thread of the component B are formed separately, and are assembled and fixed together.

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