阅读说明：本技术 一种自锁螺丝 (Self-locking screw ) 是由 陈宝年 于 2020-05-19 设计创作，主要内容包括：本发明公开了一种自锁螺丝,涉及螺丝技术领域,包括第一螺母、第二螺母、第三螺母、第四螺母、连接杆、第一一字键、第二一字键、连接件A和连接件B,所述连接杆的上方等距离设置有三个第一键槽,所述连接杆的下方一侧设置有第二键槽,所述第一螺母的内部一侧设置有第三键槽,所述第二一字键的中部设置有螺纹孔,所述第一螺母的第三键槽与连接杆的第二键槽通过第一一字键连接；所述第四螺母的上端内部等距离设置有三个包裹凹槽。本发明结构新颖,安装拆卸较为快捷方便,结构防松性强,在使用时,可以将震动力转变为螺母的锁紧力,振动力越大,夹紧力越强,稳固性更好,适宜推广使用。(The invention discloses a self-locking screw, which relates to the technical field of screws and comprises a first nut, a second nut, a third nut, a fourth nut, a connecting rod, a first I-shaped key, a second I-shaped key, a connecting piece A and a connecting piece B, wherein three first key grooves are arranged above the connecting rod at equal intervals, a second key groove is arranged on one side below the connecting rod, a third key groove is arranged on one side inside the first nut, a threaded hole is formed in the middle of the second I-shaped key, and the third key groove of the first nut is connected with the second key groove of the connecting rod through the first I-shaped key; and three wrapping grooves are formed in the upper end of the fourth nut at equal intervals. The nut locking device is novel in structure, rapid and convenient to install and disassemble, strong in structure looseness prevention, capable of converting vibration force into nut locking force when in use, stronger in clamping force and better in stability when the vibration force is larger, and suitable for popularization and use.)

1. The self-locking screw is characterized by comprising a first nut (1), a second nut (2), a third nut (3), a fourth nut (4), a connecting rod (5), a first I-shaped key (7), a second I-shaped key (8), a connecting piece A and a connecting piece B, wherein three first key grooves (9) are arranged above the connecting rod (5) at equal intervals, a second key groove (10) is arranged on one side below the connecting rod (5), a third key groove (12) is arranged on one side inside the first nut (1), a threaded hole (11) is formed in the middle of the second I-shaped key (8), and the third key groove (12) of the first nut (1) is connected with the second key groove (10) of the connecting rod (5) through the first I-shaped key (7); three wrapping grooves (13) are formed in the upper end of the fourth nut (4) at equal intervals, and the three wrapping grooves (13) are connected with the three first key grooves (9) through second straight keys (8);

end face threads are arranged on the first nut (1), the second nut (2), the third nut (3) and the fourth nut (4), the end face thread is provided with a thread lead angle, the end face thread of the first nut (1) is positioned on the upper end face of the first nut (1), the end surface thread of the fourth nut (4) is positioned on the lower end surface of the fourth nut (4), the lead angles of the end face threads of the first nut (1) and the end face threads of the fourth nut (4) are both alpha, the end surface threads of the second nut (2) and the third nut (3) are positioned on the upper end surface and the lower end surface of the second nut (2) and the third nut (3), the lead angle of the lower end surface of the second nut (2) and the upper end surface of the third nut (3) is alpha, the lead angle of the upper end face of the second nut (2) and the lower end face of the third nut (3) is beta, and the lead angle beta of the end face is larger than alpha.

2. The self-locking screw according to claim 1, wherein the first nut (1), the second nut (2), the third nut (3) and the fourth nut (4) are end face double-line single-tooth threads, and the thread form angle of the end face threads is 0 degree.

3. The self-locking screw according to claim 1, wherein the first nut (1), the second nut (2), the third nut (3) and the fourth nut (4) are two groups of double-overlapped end face threaded nuts, the two groups of double-overlapped end face threaded nuts form two groups of threaded connection pairs, and the first nut (1) and the second nut (2) form one group of threaded connection pairs; the third nut (3) and the fourth nut (4) form another group of threaded connection pair.

4. The self-locking screw according to claim 2, wherein when the two sets of double-end-face threaded nuts abut against each other at the lowest position, a gap is reserved between the axial direction of the connecting rod (5), and preferably, when the double-end-face threaded nuts are not locked, a relative position angle of not less than 90 ℃ is reserved between the beta angle of the end face thread at the upper end of the second nut (2) and the beta angle of the end face thread at the lower end of the third nut (3).

5. Self-locking screw according to claim 1, characterised in that it further comprises a washer (6), said washer (6) being chosen to have different thicknesses according to the different heights of the connection elements a and B.

6. The self-locking screw according to claim 1, wherein the three first key grooves (9) are trisected key grooves which are connected and matched with the second I-shaped key (8), the three wrapping grooves (13) are trisected grooves, and trisected notches are arranged at the connecting positions of the trisected grooves.

7. Self-locking screw according to claim 1, characterised in that the height of the first key (7) is less than the thickness of the first nut (1).

Technical Field

The invention relates to the technical field of screws, in particular to a self-locking screw.

Background

The screw is a tool for fastening the parts of the object step by utilizing the physics and mathematical principles of the inclined circular rotation and friction of the object. Screws are a common term for fasteners. The screw is an indispensable industrial necessity in daily life, such as a tiny screw used by cameras, glasses, clocks, electronics and the like; general screws for televisions, electric appliances, musical instruments, furniture, and the like; large screws and nuts are used for engineering, buildings and bridges; transportation equipment, airplanes, electric cars, automobiles, and the like are used with screws of different sizes. The screw has an important task in industry, and as long as there is industry on earth, the function of the screw is always important.

When the existing common screw is used for locking and fastening a connecting piece, the following problems mainly exist:

1. when the common thread is used for connection, the thread in a thread pair consisting of the external thread and the internal thread has poor root strength and the thread of the common thread fastener is easy to be damaged due to stress concentration because the position of the cross section of the thread in the thread pair is suddenly changed;

2. when the common screw thread is used for connection, the screw connection part is easy to loosen and has poor durability under the vibration of external force.

3. The common thread has the problems of uneven stress distribution of each thread, tripping and seizure and the like;

from the above, we have designed a self-locking screw to solve the above problems.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides a self-locking screw.

In order to achieve the purpose, the invention adopts the following technical scheme:

a self-locking screw comprises a first nut, a second nut, a third nut, a fourth nut, a connecting rod, a first key, a second key, a connecting piece A and a connecting piece B, wherein three first key grooves are formed in the upper portion of the connecting rod at equal intervals, a second key groove is formed in one side of the lower portion of the connecting rod, a third key groove is formed in one side of the inner portion of the first nut, a threaded hole is formed in the middle of the second key, and the third key groove of the first nut is connected with the second key groove of the connecting rod through the first key; three wrapping grooves are equidistantly arranged in the fourth nut, and the three wrapping grooves are connected with the three first key grooves through second straight keys;

the first nut, the second nut, the third nut and the fourth nut are all provided with end face threads, thread lead angles are arranged on the end face threads, the first nut end face threads are located on the upper end face of the first nut, the fourth nut end face threads are located on the lower end face of the fourth nut, the thread lead angles of the first nut end face threads and the fourth nut end face threads are both alpha, the second nut end face threads and the third nut end face threads are located on the upper end face and the lower end face of the second nut and the third nut, the thread lead angles of the lower end face of the second nut and the upper end face of the third nut are alpha, the thread lead angles of the upper end face of the second nut and the lower end face of the third nut are beta, and the end face thread lead angle beta is larger than alpha.

Preferably, the first nut, the second nut, the third nut and the fourth nut are end face double-line single-tooth threads, and the tooth form angle of the end face threads is 0 degree.

Preferably, the first nut, the second nut, the third nut and the fourth nut are two groups of double-overlapped end-face threaded nuts, the two groups of double-overlapped end-face threaded nuts form two groups of threaded connection pairs, and the first nut and the second nut form one group of threaded connection pairs; and the third nut and the fourth nut form another group of threaded connection pairs.

Preferably, when the two groups of double-overlapped end face threaded nuts abut against each other at the lowest position, a gap is reserved between the axial direction of the connecting rod, and preferably, when the double-overlapped end face threaded nuts are not locked, a relative position angle which is not less than 90 ℃ is reserved between the beta angle of the end face thread at the upper end of the second nut and the beta angle of the end face thread at the lower end of the third nut.

Preferably, the connecting piece also comprises a gasket, and the gasket is selected to have different thicknesses according to different heights of the connecting piece A and the connecting piece B.

Preferably, the three first key grooves are trisection key grooves matched with the second straight key in connection, the three wrapping grooves are trisection grooves, and trisection notches are formed in the positions where the trisection grooves are connected.

Preferably, the height of the first key is smaller than the thickness of the first nut.

Compared with the prior art, the invention has the beneficial effects that: according to the invention, end face threads are arranged on the first nut, the second nut, the third nut and the fourth nut, thread lead angles are arranged on the end face threads, when the nut is connected and used, the first nut, the second nut, the third nut and the fourth nut are sequentially sleeved into a connecting rod, finally, three second straight keys are embedded into a first key groove trisected above the connecting rod, and a middle threaded hole of each straight key is convenient for being taken out from a waist groove of the connecting rod by a drawing die; abutting an alpha angle of the end face thread at the upper end of the first nut with an alpha angle of the end face thread at the lower end of the second nut at the lowest position to form a group of end face thread connection pairs; rotating the fourth nut by a right angle to enable three same character keys embedded in trisection key grooves above the connecting rod to slide into trisection grooves from trisection notches at the upper end of the fourth nut, and fixing the position of the fourth nut when pretightening force exists;

the following effects can be achieved:

1. the nuts are connected in an abutting mode through end face threads (threads beta and threads alpha), so that the problems that the tooth root strength is poor due to the fact that the positions of the threads in a traditional thread pair consisting of the external threads and the internal threads are suddenly changed, stress concentration causes poor tooth root strength and threads of a common thread fastener are easy to damage due to collision can be avoided;

2. the two nuts with different rotation directions can directly convert the loosening force of the left-handed nut into the tightening force of the right-handed nut, and also can directly convert the loosening force of the right-handed nut into the tightening force of the left-handed nut, and convert the two opposite forces into mutual assistance, so that the clamping force of the connecting piece is still kept under strong vibration, and the fastening piece is superior to a fastening piece which is purely made up by depending on friction force; the problem of loosening of equipment fasteners under the working condition of strong vibration can be solved;

3. when the nut is used, the beta-angle thread surfaces of the left nut and the right nut are abutted to obtain a pretightening force through the left-handed lifting of the left-handed nut and the right-handed downward shifting of the right-handed nut. The fixing element can be locked by high or low pretightening force, is not influenced by the original pretightening force and has durability. When locking, utilize the mutual reaction force when levogyration nut and the right-handed nut cooperate, reach the locking effect of designability. The special structure can change the vibration force into the locking force of the nut, and the larger the vibration force is, the stronger the clamping force is.

The nut locking device is novel in structure, rapid and convenient to install and disassemble, strong in structure anti-loosening performance, capable of converting vibration force into nut locking force when in use, stronger in clamping force and better in stability when the vibration force is larger, and suitable for popularization and use.

Drawings

Fig. 1 is a schematic structural view of a self-locking screw according to the present invention;

FIG. 2 is a schematic structural view of a fourth nut of the self-locking screw according to the present invention;

FIG. 3 is a schematic structural view of a third nut of the self-locking screw according to the present invention;

FIG. 4 is a schematic structural view of a second nut of the self-locking screw according to the present invention;

FIG. 5 is a schematic structural view of a first nut of a self-locking screw according to the present invention;

FIG. 6 is a schematic view of a washer of the self-locking screw according to the present invention;

FIG. 7 is a schematic structural view of a second I-shaped key of a self-locking screw according to the present invention;

FIG. 8 is a top view of a second I-shaped key of a self-locking screw according to the present invention;

FIG. 9 is a front view of a second I-shaped key of a self-locking screw according to the present invention;

FIG. 10 is a cross-sectional view A-A of FIG. 9;

FIG. 11 is a schematic structural view of a first I-shaped key of a self-locking screw according to the present invention;

FIG. 12 is a schematic structural view of a connecting rod of a self-locking screw according to the present invention;

fig. 13 is a cross-sectional view of a connecting rod of a self-locking screw according to the present invention.

In the figure: 1 first nut, 2 second nuts, 3 third nuts, 4 fourth nuts, 5 connecting rods, 6 washers, 7 first keys, 8 second keys, 9 first key grooves, 10 second key grooves, 11 threaded holes, 12 third key grooves and 13 wrapping grooves.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.

Referring to fig. 1-13, a self-locking screw comprises a first nut 1, a second nut 2, a third nut 3, a fourth nut 4, a connecting rod 5, a gasket 6, a first I-shaped key 7, a second I-shaped key 8, a connecting piece A and a connecting piece B, wherein three first key grooves 9 are equidistantly arranged above the connecting rod 5, a second key groove 10 is arranged on one side below the connecting rod 5, a third key groove 12 is arranged on one side inside the first nut 1, a threaded hole 11 is arranged in the middle of the second I-shaped key 8, and the third key groove 12 of the first nut 1 is connected with the second key groove 10 of the connecting rod 5 through the first I-shaped key 7; the height of the first I-shaped key 7 is smaller than the thickness of the first nut 1, three wrapping grooves 13 are equidistantly arranged in the fourth nut 4, the three wrapping grooves 13 are connected with three first key grooves 9 through second I-shaped keys 8, the three first key grooves 9 are trisection key grooves matched with the second I-shaped keys 8 in a connecting mode, the three wrapping grooves 13 are trisection grooves, and trisection gaps are formed in the connecting positions of the trisection grooves;

the first nut 1, the second nut 2, the third nut 3 and the fourth nut 4 are all provided with end face threads, the first nut 1, the second nut 2, the third nut 3 and the fourth nut 4 are end face double-line single-tooth threads, the tooth form angle of the end face threads is 0 degree, thread lead angles are arranged on the end face threads, the end face threads of the first nut 1 are positioned on the upper end face of the first nut 1, the end face threads of the fourth nut 4 are positioned on the lower end face of the fourth nut 4, the thread lead angles of the end face threads of the first nut 1 and the end face threads of the fourth nut 4 are both alpha, the end face threads of the second nut 2 and the third nut 3 are positioned on the upper end face and the lower end face of the second nut 2 and the third nut 3, the thread lead angles of the lower end face of the second nut 2 and the upper end face of the third nut 3 are alpha, the thread lead angles of the upper end face of the second nut 2 and the lower end face of the third nut 3 are beta, and the end face; the first nut 1, the second nut 2, the third nut 3 and the fourth nut 4 are two groups of double-overlapped end face threaded nuts, the two groups of double-overlapped end face threaded nuts form two groups of threaded connection pairs, and the first nut 1 and the second nut 2 form one group of threaded connection pairs; the third nut 3 and the fourth nut 4 form another group of threaded connection pairs.