CN214007685U

CN214007685U - Fastening device

Info

Publication number: CN214007685U
Application number: CN202022902681.4U
Authority: CN
Inventors: 燕存露; 张西康
Original assignee: SHANGHAI AUTOCRAFT CO Ltd
Current assignee: SHANGHAI AUTOCRAFT CO Ltd
Priority date: 2020-12-04
Filing date: 2020-12-04
Publication date: 2021-08-20
Anticipated expiration: 2030-12-04

Abstract

The utility model discloses a fastening device, include: a compact structure that is used for with bolt threaded connection's first nut, first nut includes first nut body and sets up in the extension screw section of first nut body one side, be equipped with the extension internal thread that is used for with bolt threaded connection on the inner wall of extension screw section, the periphery threaded connection of extension screw section has the second nut, the screwing up direction of second nut is unanimous with the screwing up direction of first nut, be equipped with the internal diameter on the inner wall that second nut and extension screw section's tip correspond and be less than the tip external diameter of extension screw section, when the terminal surface laminating of second nut is in the terminal surface of first nut, compact structure compresses tightly the tip in the bolt of extension screw section. This application makes the tip of extension screw thread section have clamp bolt's pressure to increased frictional force, also can not take place not hard up when alternating load frequency is big and load is big, the applied load range is wide. And the structure is simple, ingenious and reasonable, and the popularization value is higher.

Description

Fastening device

Technical Field

The utility model relates to a fastener technical field, more specifically say, relate to a fastening device.

Background

The bolt is matched with the nut, and the lead angle of the thread is smaller than the equivalent friction angle, so that the bolt cannot rotate and loosen under the static condition, but the connecting pair is subjected to alternating load, vibration and impact, and the loosening of the threaded connection can be caused. The method for preventing loosening by utilizing the double nuts is a convenient and simple method, is economical and practical, and has the principle that the double nuts are screwed, the two nuts form a butting effect, the stress directions of the threads are opposite, if the connected piece and the lower nut are loosened, the nuts are difficult to rotate and loosen due to high friction force between the upper nut and the lower nut.

At present, the double-nut anti-loosening method is ideal in anti-loosening on stable alternating load occasions, but occurs in places with high alternating load frequency and high load, and the anti-loosening function is difficult to play by using the opposite-vertex anti-loosening function.

In summary, how to provide a locking device with a wide application load range is an urgent problem to be solved by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of this, the present invention provides a fastening device with a wide application load range.

In order to achieve the above object, the present invention provides the following technical solutions:

a fastening device, comprising: the first nut is used for being connected with a bolt through threads, the first nut comprises a first nut body and an elongated thread section arranged on one side of the first nut body, an elongated internal thread used for being connected with the bolt through threads is arranged on the inner wall of the elongated thread section, a second nut is connected with the outer periphery of the elongated thread section through threads, the screwing direction of the second nut is consistent with the screwing direction of the first nut, a compression structure with the inner diameter smaller than the outer diameter of the end part of the elongated thread section is arranged on the inner wall corresponding to the end part of the elongated thread section, the end face of the second nut is attached to the end face of the first nut, and the compression structure compresses the end part of the elongated thread section in the bolt.

Preferably, the elongated internal threads are connected to the first internal threads of the first nut body.

Preferably, a preset distance is arranged between the lengthened external thread of the lengthened thread section and the end part of the lengthened thread section, and four grooves are arranged at the end part of the lengthened thread section.

Preferably, all of the grooves are symmetrically arranged on the end surface of the extended thread section.

Preferably, the outer edge of the end part of the lengthened thread section is provided with a chamfer.

Preferably, the compression structure is a tapered surface with an inner diameter gradually decreasing along the direction from the end of the second nut close to the first nut body to the end of the second nut far from the first nut body.

Preferably, the tapered surface is an arc-shaped tapered surface whose longitudinal section is arc-shaped.

Compared with the prior art, the end part of the lengthened thread section has the axial force of the compression bolt, looseness can not occur when alternating load frequency is high and load is large, and the application load range is wide. And the structure is simple, ingenious and reasonable, and the popularization value is higher.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

Fig. 1 is a cross-sectional view of a fastening device provided by the present invention mounted to mounting holes of a first plate and a second plate;

fig. 2 is a cross-sectional view of the first and second nut assemblies provided by the present invention;

fig. 3 is an isometric view of a first nut provided by the present invention.

In FIGS. 1-3:

the nut comprises a bolt 1, a first plate 2, a second plate 3, a first internal thread 4, a lengthened external thread 5, a second nut 6, a compression structure 7, a crest 8, a second internal thread 9, a lengthened thread section 10, a first nut body 11 and a groove 12.

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. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

The core of the utility model is to provide a wide fastener of application load range.

Referring to fig. 1-2, fig. 1 is a cross-sectional view of a fastening device of the present invention installed in an installation hole of a first plate and a second plate; fig. 2 is a cross-sectional view of the first and second nut assemblies provided by the present invention; fig. 3 is an isometric view of a first nut provided by the present invention.

A fastening device, comprising: a compact structure 7 that the internal diameter is less than the tip external diameter of lengthened thread section 10 is equipped with on the inner wall that second nut 6 and lengthened thread section 10's tip corresponds, when the terminal surface laminating of second nut 6 is in the terminal surface of first nut, compact structure 7 compresses tightly the tip in bolt 1 of lengthened thread section 10.

It should be noted that the first nut body 11 is provided with a first internal thread 4 on the inner circumference, an elongated internal thread on the inner circumference, an elongated external thread 5 on the outer circumference, and a second internal thread 9 on the inner circumference of the second nut 6, and both the first internal thread 4 and the elongated internal thread are in threaded connection with the bolt 1, that is, both the first nut body 11 and the elongated internal thread 10 are sleeved outside the bolt 1, the tightening direction of the first nut body 11 is toward the nut at the end of the bolt 1, and the tightening direction of the second nut body 6 is consistent with the tightening direction of the first nut body 11.

The first nut body 11 and the extended thread section 10 are integrally formed, so that the firmness between the first nut body 11 and the extended thread section 10 can be improved, and the extended thread section 10 can be tightened while the first nut body 11 is tightened. The threads in the application are metric threads, so that the processing is simple and the cost is low.

When the installation, at first pass first board 2 and the mounting hole of second board 3 with bolt 1 in proper order, then screw first nut body 11 on bolt 1, it needs to be noted that when the installation need be close to the face installation of second board 3 with first nut body 11, can screw up to suitable installation moment of torsion through the spanner when screwing up. Afterwards, the second nut 6 is screwed on the lengthened thread section 10, and is screwed continuously, so that the end surface of the second nut 6 is gradually close to the end surface of the first nut body 11, when the end surface of the second nut 6 is attached to the end surface of the first nut body 11, the compression structure 7 is compressed on the end part of the lengthened thread section 10, and as the outer diameter of the lengthened thread section 10 is larger than the inner diameter of the compression structure 7, the compression structure 7 can have a force acting on the end part of the lengthened thread section 10 in the radial direction, so that the end part of the lengthened thread section 10 is further compressed on the bolt 1, and the friction force between the lengthened thread section 10 and the bolt 1 is increased.

Compared with the prior art, the end part of the lengthened thread section 10 has the axial force of the compression bolt 1, looseness can not occur when alternating load frequency is high and load is large, and the application load range is wide. And the structure is simple, ingenious and reasonable, and the popularization value is higher.

In addition to the above embodiments, as a further preferable mode, an elongated female screw is connected to the first female screw 4 of the first nut body 11.

It should be noted that, when the first nut body 11 and the extended thread section 10 are integrally arranged, the hollow portion of the first nut body 11 is connected with the hollow portion of the extended thread section 10, and the extended internal thread is connected to the first internal thread 4, so that the extended internal thread and the first internal thread 4 can be formed at one time, the processing times are reduced, and the processing cost is reduced.

In addition to the above embodiment, it is further preferable that a predetermined distance is provided between the external extension thread 5 of the extended thread section 10 and the end of the extended thread section 10, and four grooves 12 are provided at the end of the extended thread section 10.

It should be noted that the part from the end of the lengthened thread section 10 to the lengthened external thread 5 is a crest 8, and the preset distance from the top surface of the crest 8 to the lengthened external thread 5 can be set to be 2-3P. The outer peripheral surface of crest 8 is smooth, and the diameter of the outer peripheral surface of crest 8 is less than the diameter of elongated external thread 5, so that elongated external thread 5 does not block the movement of compressing structure 7.

The grooves 12 are formed by recessing the end surfaces of the lengthened thread section 10, and the four grooves 12 are arranged on the end surfaces of the lengthened thread section 10, so that the tooth tops 8 are deformed and pressed on the bolt 1 towards the bolt 1, and the friction between the tooth tops 8 and the bolt 1 is further increased.

The recesses 12 are preferably all arranged symmetrically on the end face of the thread extension 10.

It should be noted that, the grooves 12 symmetrically disposed on the end surface of the lengthened thread section 10 can equally divide the end surface of the lengthened thread section 10 into a plurality of arc surfaces, so that the side walls of the crests 8 are the same in size, and when the crests 8 are pressed and radially compressed on the bolt 1, the radial force applied to the side surfaces of the crests 8 is equal, so that the stress applied to the bolt 1 in each direction is equal, and the bolt 1, the first nut and the second nut 6 can stably fix the first plate 2 and the second plate 3.

In addition to the above embodiments, it is further preferable that the outer edge of the end of the extended thread section 10 is provided with a chamfer.

It should be noted that the chamfer is provided to make the outer edge of the end surface of the lengthened thread section 10 be an inclined annular surface, the structure provided in this embodiment may be adapted to the pressing surface of the pressing structure 7, if the chamfer is not provided, the area of the outer edge of the end surface of the lengthened thread section 10 is small, the pressure is large after the chamfer is contacted with the pressing structure 7, and a large damage may be caused to the pressing structure 7. The chamfer provided in the present embodiment can reduce damage to the hold-down structure 7.

In addition to the above-described embodiment, as a further preferable mode, the pressing structure 7 is a tapered surface having an inner diameter gradually decreasing along the end portion of the second nut 6 close to the first nut body 11 toward the end portion of the second nut 6 away from the first nut body 11.

It should be noted that the tapered surface may be a tapered surface, an inner diameter of the tapered surface near the end of the elongated external thread 5 is larger than an inner diameter of the tapered surface far from the end of the elongated external thread 5, and when the second nut 6 is attached to the end surface of the first nut body 11 and is gradually tightened, the inner diameter of the tapered surface attached to the end of the first nut body 11 is gradually reduced, so that the tapered surface may gradually increase the pressing force against the end of the first nut body 11. The convergent surface is convenient to process and simple in structure.

In addition to the above-described embodiments, it is further preferable that the tapered surface is an arc-shaped tapered surface whose longitudinal section is arc-shaped. Of course, the tapered surface may have a tapered cross section, and the shape of the tapered surface may be set according to the actual application.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The fastening device provided by the present invention has been described in detail above. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. A fastening device, comprising: a first nut used for being in threaded connection with a bolt (1), the first nut comprises a first nut body (11) and an elongated thread section (10) arranged on one side of the first nut body (11), the inner wall of the lengthened thread section (10) is provided with lengthened internal threads for being in threaded connection with the bolt (1), the outer circumference of the lengthened thread section (10) is connected with a second nut (6) in a threaded manner, the screwing direction of the second nut (6) is consistent with that of the first nut, the inner wall of the second nut (6) corresponding to the end part of the lengthened thread section (10) is provided with a compression structure (7) with the inner diameter smaller than the outer diameter of the end part of the lengthened thread section (10), when the end face of the second nut (6) is attached to the end face of the first nut, the pressing structure (7) presses the end part of the lengthened thread section (10) to the bolt (1).

2. Fastening device according to claim 1, characterized in that the elongated internal thread is connected to the first internal thread (4) of the first nut body (11).

3. Fastening device according to claim 1, characterized in that the external thread extension (5) of the thread extension segment (10) is provided with a predetermined distance from the end of the thread extension segment (10), and that the end of the thread extension segment (10) is provided with four recesses (12).

4. A fastening device according to claim 3, wherein all of the recesses (12) are symmetrically arranged at the ends of the thread extension (10).

5. A fastening device according to claim 4 wherein the outer edges of the ends of the elongate threaded section (10) are chamfered.

6. The fastening device according to claim 2, wherein the compression structure (7) is a tapered surface having an inner diameter that gradually decreases provided along an end of the second nut (6) close to the first nut body (11) toward an end of the second nut (6) away from the first nut body (11).

7. The fastening device according to claim 6, wherein the tapered surface is an arc-shaped tapered surface having an arc-shaped longitudinal section.