CN217381227U

CN217381227U - Variable-pitch threaded connection mechanism and machining die thereof

Info

Publication number: CN217381227U
Application number: CN202220962130.3U
Authority: CN
Inventors: 高慎金; 陈衍祥; 田坤
Original assignee: Zhuzhou Haojie Aviation Technology Co ltd
Current assignee: Zhuzhou Haojie Aviation Technology Co ltd
Priority date: 2022-04-24
Filing date: 2022-04-24
Publication date: 2022-09-06
Anticipated expiration: 2032-04-24

Abstract

The utility model discloses a variable-pitch threaded connection mechanism and a processing die thereof, which comprises a total thread section, wherein the total thread section is divided into three sections, namely a starting end section, a middle part section and a tail end section, and the pitches of the starting end section and the tail end section are standard thread pitches P; the middle part is provided with multi-thread variable-pitch threads, the thread pitches of the multi-thread threads at the middle part are gradually increased along the direction from the starting end to the ending end, and the thread pitches of the multi-thread threads at the middle part are all smaller than P; the threaded connection is uniformly stressed, so that stress concentration is not easy to generate; the locking torque is distributed uniformly, and the torque can be controlled through the variable pitch, so that the torque is more stable and better controlled.

Description

Variable-pitch threaded connection mechanism and machining die thereof

Technical Field

The utility model relates to a threaded connection technical field, concretely relates to threaded connection mechanism of variable pitch and mold processing thereof.

Background

The anti-loosening of threaded connection is a problem to be solved in the fields of automobiles, high-speed rails, aerospace and even daily supplies, and the like.

The common thread engagement is that the front 7 threads are stressed, the stress is mainly concentrated on the front 3 threads, wherein the stress of the first thread is the largest and is about 30 percent, the stress of each thread is reduced in a nonlinear way, and the stress of the front three threads can account for about 80 percent. Stress concentration is serious during ordinary threaded connection, and the fracture basically all takes place in three preceding thread connection departments, greatly reduced threaded connection's intensity like this, the threaded connection technique of this patent can let the atress more even, has improved threaded connection bearing capacity.

The most mainstream locking mode of aerospace at present is that the geometry warp is locking, and the product of using mainly has self-locking nut and high lock nut, and these two kinds of products are huge in aerospace field use amount, and these two kinds of products make the screw thread warp through closing up, produce during the assembly and interfere, reach the purpose of locking, and its shortcoming is that deformation position stress concentration is serious, has reduced threaded connection's intensity, the difficult stable control of locking moment, has reduced the stability of threaded connection locking moment control, has increased the degree of difficulty and the cost of making.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems, the utility model provides a variable-pitch threaded connection mechanism and a processing die thereof, which comprises a total thread section, wherein the total thread section is divided into three sections, namely a starting end section, a middle part section and a tail end section, and the pitches of the starting end section and the tail end section are standard thread pitches P; the middle part is provided with multi-thread variable-pitch threads, the thread pitches of the multi-thread threads at the middle part are gradually increased along the direction from the starting end to the ending end, and the thread pitches of the multi-thread threads at the middle part are all smaller than P.

Furthermore, the starting end has two standard thread pitches, and the ending end has one standard thread pitch.

Furthermore, the smallest thread pitch in the middle part is not less than 0.8P.

Furthermore, the total thread section is an external thread, and the starting end, the middle part and the ending end are arranged on the outer ring of the bolt in an external thread mode.

Furthermore, the total thread section is an internal thread, and the starting end, the middle part and the ending end are arranged on the inner ring of the nut in an internal thread mode.

Further, the screw rod external thread machining device further comprises a die for machining the external thread of the screw rod, the die is in the shape of a thread rolling wheel, and the outer ring of the die is provided with three-section type threads with a starting end, a middle part and a tail end.

The utility model discloses beneficial effect as follows:

1. the threaded connection is uniformly stressed, so that stress concentration is not easy to generate; the locking torque is distributed uniformly, and the torque can be controlled through the variable pitch, so that the torque is more stable and better controlled.

2. The starting end is provided with two threads with normal thread pitches, so that the threads can be screwed conveniently; the ending end is provided with a thread with a normal thread pitch, and the thread with the normal thread pitch can ensure that the thread can be screwed to the bottom more conveniently so as to ensure that no gap is left between the installation surface and the installation surface.

3. Because the number of bearing buckles is increased and the stress concentration is reduced, the length of the thread can be reduced, and the weight of the part can be reduced due to the reduction of the length of the thread.

Drawings

FIG. 1 is a schematic view of the internal structure of the total thread segment of the present invention;

FIG. 2 is a schematic view of the distribution structure of the external and internal threaded screws of the present invention;

fig. 3 is the external structure diagram of the middle mold of the present invention.

The reference numerals are explained below: 1. a starting end; 2. a middle portion; 3. ending the tail end; 4. and (5) molding.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Moreover, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance.

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

The invention will be further explained with reference to the drawings in the following description:

example 1:

as shown in fig. 1 and 2, a variable-pitch threaded connection mechanism and a processing mold thereof comprise a total thread section, wherein the total thread section is divided into a starting end 1, a middle part 2 and a final end 3.

In this embodiment, the middle portion 2 has multi-thread pitch-variable threads, and the pitch of the multi-thread threads of the middle portion 2 gradually increases along the direction from the starting end 1 to the ending end 3, and the pitch of the multi-thread threads of the middle portion 2 is smaller than P; the pitch of the middle part 2 is changed to ensure that the threads are matched to form a certain interference amount by changing the pitch, the interference amount can ensure that the threads are contacted to generate larger friction force, and the friction force can generate certain anti-loosening torque.

In this embodiment, the thread pitches of the start end 1 and the end 3 are the standard thread pitch P, the start end 1 has two standard thread pitches, so as to facilitate screwing, and the end 3 has one standard thread pitch, so as to ensure that no gap is left in the subsequent mounting surface.

Example 2:

on the basis of the embodiment 1, the total thread section is an external thread, and the starting end 1, the middle part 2 and the ending end 3 are arranged on the outer ring of the bolt in an external thread form; the starting end 1, the middle part 2 and the ending end 3 are applied to the bolt, and the variable pitch length can be customized according to the actual variable pitch length.

Example 3:

on the basis of the embodiment 1, the total thread section is an internal thread, and the starting end 1, the middle part 2 and the ending end 3 are arranged on the inner ring of the nut in an internal thread mode; the starting end 1, the middle part 2 and the ending end 3 are applied to a nut, and the variable pitch length can be customized according to the actual variable pitch length.

Example 4:

as shown in fig. 3, on the basis of the above embodiment 2, the screw rod further includes a mold 4 for processing the external thread of the screw rod, the mold 4 is in the shape of a thread rolling wheel, and the outer ring of the mold 4 is provided with a three-stage thread having a starting end 1, a middle part 2 and a terminating end 3; the processing mould 4 can realize the processing demand of the variable thread screw rod, and the mould 4 has two symmetrical ends and can prolong the service life.

The utility model discloses the theory of operation as follows:

the starting end 1 is provided with two standard thread pitches, so that the threads can be screwed conveniently; the thread pitch of the threads at the middle part 2 is changed step by step, the threads are matched to form a certain interference amount by changing the thread pitch, the interference amount can enable the threads to contact to generate larger friction force, and the friction force can generate a certain anti-loosening torque; the tail end 3 is provided with a thread pitch of a standard thread, so that the thread is conveniently screwed to the bottom, and a gap between the tail end and an installation surface is avoided during installation.

Because the variable pitch of the middle part 2 leads the variable pitch part to be stressed in advance, the force of the thread part can be dispersed on each variable pitch thread and the front three threads when the force is loaded, and the stress concentration is effectively prevented; because the number of bearing buckles is increased and the stress concentration is reduced, the length of the thread can be reduced, and the weight of the part can be reduced due to the reduction of the length of the thread.

The number of the thread buckles of the middle part 2 can be customized according to actual requirements, and the locking torque can be changed by adjusting the length of the thread pitch of the middle part 2 so as to adapt to different processing environments.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and all such changes and modifications fall within the scope of the present invention as claimed.

Claims

1. The utility model provides a become threaded connection mechanism of pitch and mold processing thereof, includes total thread section, its characterized in that: the total thread section is divided into three sections, namely a starting end (1), a middle part (2) and a tail end (3), and the thread pitches of the starting end (1) and the tail end (3) are standard thread pitch P; the middle part (2) is provided with multi-thread variable-pitch threads, the thread pitches of the multi-thread threads of the middle part (2) are gradually increased along the direction from the starting end (1) to the ending end (3), and the thread pitches of the multi-thread threads of the middle part (2) are all smaller than P.

2. The thread connecting mechanism and the processing die thereof according to claim 1, wherein: the starting end (1) is provided with two standard thread pitches, and the tail end (3) is provided with one standard thread pitch.

3. The thread connecting mechanism and the processing die thereof according to claim 1, wherein: the smallest thread pitch of the threads in the middle part (2) is not less than 0.8P.

4. The thread connecting mechanism and the processing die thereof according to claim 1, wherein: the total thread section is an external thread, and the outer ring of the bolt is opened in a thread form outside the starting end (1), the middle part (2) and the ending end (3).

5. The thread connecting mechanism and the processing die thereof according to claim 1, wherein: the total thread section is an internal thread, and the starting end (1), the middle part (2) and the ending end (3) are arranged on an inner ring of the nut in an internal thread mode.

6. The variable pitch threaded connection and its processing die of claim 4, wherein: the thread forming die is characterized by further comprising a die (4) for processing external threads of the screw rod, the die (4) is in the shape of a thread rolling wheel, and the outer ring of the die (4) is provided with three-section threads in the type of a starting end (1), a middle part (2) and a tail end (3).