CN114087269A

CN114087269A - Self-locking anti-loosening segmented micro-adjustable non-full-thread bolt with thread pitch

Info

Publication number: CN114087269A
Application number: CN202111464637.2A
Authority: CN
Inventors: 程东梅; 郝长仁; 吴穷; 韩环成; 李扬
Original assignee: 703th Research Institute of CSIC
Current assignee: 703th Research Institute of CSIC
Priority date: 2021-12-02
Filing date: 2021-12-02
Publication date: 2022-02-25

Abstract

The invention belongs to the technical field of industrial non-full thread bolt connection structures, and particularly relates to a self-locking anti-loosening segmented micro-adjustable pitch non-full thread bolt. According to the invention, the thread of the bolt is divided into a standard matching meshing section and a fine-tuning variable pitch section according to the meshing position of the nut and the bolt; the pitch value of the variable pitch section is reduced through fine adjustment, so that when the standard nut is meshed with the fine adjustment variable pitch bolt, the inner thread and the outer thread reach meshing clamping, and the self-locking and anti-loosening functions are realized. According to the invention, other accessories are not required to be added, the nut and the fine-adjustment variable-pitch section of the bolt are engaged with 3 to 5 threads to achieve effective self-locking, and the self-locking rate can reach more than 80%. The invention can be customized and processed, can also be produced in large scale, is easy to realize, and can be widely applied to industrial threaded connection structures.

Description

Self-locking anti-loosening segmented micro-adjustable non-full-thread bolt with thread pitch

Technical Field

The invention belongs to the technical field of industrial non-full thread bolt connection structures, and particularly relates to a self-locking anti-loosening segmented micro-adjustable pitch non-full thread bolt.

Background

The thread connection structure is widely applied in industry, but the standard thread connection structure has no self-locking property and is loosened and released frequently in the using process. Statistically, the direct economic loss caused by loosening and failure of threaded connections is as high as billions of dollars worldwide every year. Various major equipment is continuously developed nowadays, and the self-locking performance of the threaded connection directly influences the reliability and safety of the equipment and has great influence on industrial development.

At present, the self-locking performance of threaded connection is improved by means of additional fittings, and the additional fittings often cause increase of failure factors.

Disclosure of Invention

The invention aims to provide a self-locking anti-loosening segmented micro-adjustable pitch non-full thread bolt which can be produced in a large scale and is easy to realize without adding other accessories.

A self-locking anti-loosening segmented micro-adjustable non-full thread bolt with a thread pitch consists of a bolt head, a thread-free segment and a thread segment; the thread section consists of a fine-tuning variable thread pitch section and a standard thread pitch section, and the fine-tuning variable thread pitch section is connected with the thread-free section; the pitch value of the standard pitch section is P; the thread angle and the thread form of the thread of the micro-adjustable pitch section are consistent with those of the thread of the standard pitch section, and the pitch value of the micro-adjustable pitch section is slightly smaller than P.

Further, the pitch value of the micro-modulation pitch segment is 0.99P.

Further, when the bolt is meshed with the nut, the nut is meshed with the fine-adjustment variable-pitch section by 3 to 5 thread teeth, and effective self-locking can be achieved.

Further, when the bolt is actually machined, the meshing amount of the nut and the bolt in a standard thread pitch section of 2-3 threads is reserved.

The invention has the beneficial effects that:

according to the invention, the thread of the bolt is divided into a standard matching meshing section and a fine-tuning variable pitch section according to the meshing position of the nut and the bolt; the pitch value of the variable pitch section is reduced through fine adjustment, so that when the standard nut is meshed with the fine adjustment variable pitch bolt, the inner thread and the outer thread reach meshing clamping, and the self-locking and anti-loosening functions are realized. According to the invention, other accessories are not required to be added, the nut and the fine-adjustment variable-pitch section of the bolt are engaged with 3 to 5 threads to achieve effective self-locking, and the self-locking rate can reach more than 80%. The invention can be customized and processed, can also be produced in large scale, is easy to realize, and can be widely applied to industrial threaded connection structures.

Drawings

Fig. 1 is a schematic structural view of a self-locking anti-loosening segmented micro-adjustable non-full thread bolt with a thread pitch according to the present invention.

Fig. 2 is a schematic view of the present invention engaged with a standard nut.

FIG. 3 is a schematic view of the thread tooth deformation self-locking after the micro-adjustable pitch segment is engaged with a standard nut.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

The invention provides a self-locking anti-loosening segmented micro-regulation thread pitch non-full thread bolt, which is characterized in that based on the stress deformation condition of thread teeth after thread connection and matching, the size of the thread pitch of the bolt is adjusted in a segmented mode, so that the stressed bolt thread and nut thread are meshed and clamped, and the self-locking anti-loosening function is realized. The invention can be produced in scale, is easy to realize, does not need to add other accessories, improves the self-locking property of the connection between the bolt and the nut by finely adjusting the pitch of the bolt in sections, thereby achieving good anti-loosening effect,

the specific implementation process of the invention is as follows:

1. as shown in FIG. 2, according to the thickness and the stress of the workpieces 1 and 2, the diameter, the thread pitch, the thread length of the bolt and the position where the nut is engaged with the bolt can be determined. According to the position of the nut engaged with the bolt, the bolt thread section is divided into a standard thread pitch section and a fine-adjustment variable thread pitch self-locking section, and the thread length of each section is determined (see fig. 1).

2. In order to ensure the sufficient meshing performance of the nut and the bolt, the thread angle and the thread form of the standard matching meshing section and the fine-adjustment variable-pitch section of the bolt are consistent, only the pitch value is slightly different, the pitch value of the fine-adjustment variable-pitch section is 0.99P, and P is a standard pitch value.

Considering that the thread pitches of the fine-adjustment variable-pitch area of the standard nut and the bolt are not equal and the screwing is difficult, in order to improve the meshing degree of the standard nut and the fine-adjustment variable-pitch bolt, the meshing amount of 2 to 3 thread teeth of the nut and the bolt in the standard meshing area is reserved, and therefore the actual processing structure chart of the bolt can be determined.

3. When the bolt is meshed with the nut, effective self-locking can be achieved by ensuring that the nut is meshed with the fine-adjustment variable-pitch section of the bolt by 3 to 5 thread teeth (see figure 2), and the self-locking rate can reach over 80 percent.

After a certain pretightening force is applied to the threaded connection structure, the thread pitch of the fine-adjustment variable-pitch section of the bolt is slightly smaller than that of the standard nut, the diameter of the nut is larger than that of the bolt, the thread of the bolt is extruded by the force of the nut to generate a large deformation amount, and after the pretightening force is removed, the bolt thread rebounds to form inter-thread self-locking with the thread of the nut. The thread connection structure can achieve good self-locking performance by meshing the micro-adjustable pitch section with the scale distance nut by 3 to 5 thread teeth.

For special, important components, the bolt can be customized according to the method. For mass production and application, the bolt thread segment can be divided into three specifications to meet most of the use requirements: (1) the standard pitch section and the fine-tuning pitch section respectively account for one half; (2) the standard pitch section accounts for one third, and the fine-tuning pitch section accounts for two thirds; (3) the standard pitch segment takes two thirds, and the fine pitch segment takes one third.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a non-full thread bolt of segmentation micro-modulation pitch of auto-lock locking taking off which characterized in that: the bolt consists of a bolt head, a thread-free section and a thread section; the thread section consists of a fine-tuning variable thread pitch section and a standard thread pitch section, and the fine-tuning variable thread pitch section is connected with the thread-free section; the pitch value of the standard pitch section is P; the thread angle and the thread form of the thread of the micro-adjustable pitch section are consistent with those of the thread of the standard pitch section, and the pitch value of the micro-adjustable pitch section is slightly smaller than P.

2. The self-locking anti-loosening segmented micro-adjustable thread pitch non-full thread bolt as claimed in claim 1, wherein: the pitch value of the micro-modulation pitch segment is 0.99P.

3. The self-locking anti-loosening segmented micro-adjustable thread pitch non-full thread bolt as claimed in claim 1, wherein: when the bolt is meshed with the nut, the nut is meshed with the fine-adjustment variable pitch section by 3 to 5 thread teeth, so that effective self-locking can be achieved.

4. The self-locking anti-loosening segmented micro-adjustable thread pitch non-full thread bolt as claimed in claim 1, wherein: when the bolt is actually machined, the meshing amount of the nut and the bolt in a standard thread pitch section of 2-3 threads is reserved.