CN118224172B - Self-locking threaded connection structure - Google Patents
Self-locking threaded connection structure Download PDFInfo
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- CN118224172B CN118224172B CN202410654425.8A CN202410654425A CN118224172B CN 118224172 B CN118224172 B CN 118224172B CN 202410654425 A CN202410654425 A CN 202410654425A CN 118224172 B CN118224172 B CN 118224172B
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- nut
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- pin
- locking
- stop pin
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- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000000149 penetrating effect Effects 0.000 abstract description 3
- 238000009434 installation Methods 0.000 abstract description 2
- 230000002265 prevention Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/22—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening
- F16B39/28—Locking of screws, bolts or nuts in which the locking takes place during screwing down or tightening by special members on, or shape of, the nut or bolt
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The invention discloses a self-locking threaded connection structure, and belongs to the technical field of equipment manufacturing. The self-locking nut comprises a base and a self-locking nut component; the self-locking nut component comprises a nut, a stop pin and a force application spring; an opening is formed in the center of the base; the upper surface of the base is provided with a plurality of tooth platforms which are arranged around the open holes and have the same structure and are arranged continuously; a threaded hole is formed in the center of the nut, and the threaded hole is in threaded connection with the threaded columnar body; the nut is provided with a pin hole with an axis parallel to the axis of the threaded hole, and a stop pin is arranged in the pin hole in a penetrating way; the stop pin is movably arranged in the pin hole of the nut; the bottom of the stop pin is a pointed structure which is matched with the tooth platform on the base, and the pointed structure of the stop pin can move from one tooth platform to the next tooth platform along the moving surface of the tooth platform; the upper end and the lower end of the force spring are respectively contacted with the upper boss and the lower boss, so that the self-locking installation of the threaded connection structure is realized.
Description
Technical Field
The invention relates to the technical field of equipment manufacturing, in particular to a self-locking threaded connection structure.
Background
The threaded connection is a widely used connection mode with the characteristic of detachable fixation, and has the advantages of simple structure, reliable connection, convenient assembly and disassembly and the like. With the rapid development of aviation equipment technology, threaded connection always occupies an important position in the field of aircraft manufacturing, but because an aircraft is influenced by vibration of an engine and external high-speed airflow impact in the flight process, the aircraft body can generate extremely large vibration, and the aircraft body assembly by means of threaded connection is a serious test.
At present, most of modes for preventing screw loosening in aircraft manufacturing are in the forms of fuse loosening prevention, spring gasket loosening prevention, point punching loosening prevention, anaerobic adhesive loosening prevention and the like, but the modes are limited by the internal space of an aircraft body, the difficulty of implementing the loosening prevention method in a part of areas is high, and meanwhile, for the parts with tightening torque requirements, no enough operation space can be used for tightening by using a special torque wrench.
There are also some loose-proof threaded fasteners with self-locking function, such as: chinese patent document CN202122648843.0 discloses a anti-spin self-locking threaded fastener, its structure self-locking function can only play the effect when rotating more than 90 ° at every turn, need additionally demolish bolt afterbody subassembly when demolishing the nut, lack maneuverability in the demonstration, and this structure does not have the power function, can't satisfy the common moment tightening requirement in the mechanical structure, and the application scenario is very limited.
Disclosure of Invention
The invention aims to provide a self-locking threaded connection structure which has a locking and self-locking function and has small requirements on an operation space, and solves the problems in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a self-locking threaded connection structure comprises a base and a self-locking nut component; the self-locking nut component comprises a nut, a stop pin and a force application spring;
the base is provided with an opening at the center for coaxially connecting the column-shaped body with threads; the upper surface of the base is provided with a plurality of tooth platforms which are arranged around the open holes and have the same structure and are arranged continuously, and each tooth platform consists of a moving surface and a stop surface;
the center of the nut is provided with a threaded hole, and the threaded hole is in threaded connection with the threaded columnar body; the nut is arranged above the base; the nut is provided with a pin hole with an axis parallel to the axis of the threaded hole, and a stop pin is arranged in the pin hole in a penetrating way.
The stop pin penetrates into the pin hole of the nut and is movably arranged in the pin hole, and can move up and down relative to the pin hole; the bottom of the stop pin is a pointed structure which is matched with the tooth platform on the base, the pointed structure of the stop pin can move from one tooth platform to the next tooth platform along the moving surface, and the pointed structure of the stop pin is limited by the stop surface to displace;
The force application spring is coaxially assembled with the stop pin and is positioned above the lower boss; an upper boss is arranged in the pin hole, and the upper end and the lower end of the force application spring are respectively contacted with the upper boss and the lower boss.
As a preferred technical scheme, the self-locking nut assembly comprises a blanking cover assembled on the pin hole, the projection of the blanking cover is of a T-shaped structure, the vertical part of the blanking cover penetrates into the pin hole to form the upper boss, and the horizontal straight part of the blanking cover is positioned on the upper surface of the nut.
As a preferred technical scheme, the top of the stop pin is provided with a nut.
As a preferable technical scheme, the upper part of the stop pin is provided with an indication scale.
As a preferable technical scheme, at least two pin holes are arranged, and the pin holes are uniformly distributed around the threaded holes.
As a preferred solution, the movement surface is an inclined surface and the stop surface is a vertical surface.
As a preferable technical scheme, the outer wall of the vertical part of the plug cover is provided with threads, the inner wall of the upper part of the pin hole is provided with threads, and the plug cover is in threaded connection with the pin hole. The diameter of the pin hole is larger than the outer diameter of the force application spring and the maximum outer diameter of the stop pin.
Compared with the prior art, the invention has the following beneficial effects:
The thread locking structure is changed to realize thread self-locking, so that the problem of difficult thread locking construction in the existing limited space is solved;
Aiming at the fact that the connection moment of the bolt in the limited space cannot be detected, the moment is visualized through the displacement of the stop pin through the stress conversion in the structure, and therefore fixed-force construction and installation can be completed.
Drawings
FIG. 1 is a diagram showing the effect of the positional relationship between a stopper pin and a base of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
FIG. 3 is a schematic structural view of a closure;
Fig. 4 is a schematic structural view of the stopper pin.
Wherein reference numerals are as follows: 1-base, 101-tooth platform, 2-nut, 3-threaded column, 4-stop pin, 401-lower boss, 402-scale, 403-nut, 5-force spring, 6-blanking cover.
Detailed Description
The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
On the contrary, the application is intended to cover any alternatives, modifications, equivalents, and variations as may be included within the spirit and scope of the application as defined by the appended claims. Further, in the following detailed description of the present application, certain specific details are set forth in order to provide a better understanding of the present application. The present application will be fully understood by those skilled in the art without the details described herein.
Examples
As shown in fig. 1-4, a self-locking threaded connection structure comprises a base 1 and a self-locking nut component; the self-locking nut assembly comprises a nut 2, a stop pin 4 and a force application spring 5. The structure is used for being assembled on the threaded column body 3 and completing self-locking connection with the threaded column body 3.
A base 1, the center of which is provided with an opening for coaxially connecting a column body 3 with threads; the upper surface of the base 1 is provided with a plurality of tooth platforms 101 which are arranged around the open holes and are identical in structure and are arranged continuously, and each tooth platform 101 consists of a moving surface and a stop surface.
A threaded hole is formed in the center of the nut 2, and the threaded hole is in threaded connection with the threaded columnar body 3; the nut 2 is arranged above the base 1; the nut 2 is provided with a pin hole with an axis parallel to the axis of the threaded hole, and a stop pin 4 is arranged in the pin hole in a penetrating way.
The stop pin 4 penetrates into the pin hole of the nut 2 and is movably arranged in the pin hole, and can move up and down relative to the pin hole; the bottom of the stop pin 4 is a pointed structure which is matched with the tooth platform 101 on the base 1 so as to complete self-locking, and the pointed structure of the stop pin 4 can move from one tooth platform 101 to the next tooth platform 101 along a moving surface, and the pointed structure of the stop pin 4 is limited to be displaced by the stop surface.
The force application spring 5, the stop pin 4 is provided with a lower boss 401, the force application spring 5 and the stop pin 4 are coaxially assembled, and the force application spring 5 is positioned above the lower boss 401; an upper boss is arranged in the pin hole, and the upper end and the lower end of the force application spring 5 are respectively contacted with the upper boss and the lower boss 401.
By arranging the nut 2, the threaded connection with the threaded column body is completed; by providing the seat 1 for cooperation with the pointed structure at the bottom of the retaining pin 4, the retaining pin 4 is restricted to move only along the moving surface. By providing the urging spring 5 such that the detent pin 4 moves upward along the movement surface, the urging spring 5 is compressed, and when the detent pin 4 moves to the next tooth stage 101, the return force of the urging spring 5 moves the detent pin 4 downward.
The working principle of the embodiment is as follows: the combined self-locking nut assembly is sleeved on the threaded cylinder and screwed into the base 1 clockwise, when the stop pin 4 in the self-locking nut assembly is in contact with the tooth platform 101 in the base 1, the stop pin 4 is subjected to the reaction force of the base 1, the force-applying spring 5 is overcome to move upwards, and the stop pin 4 is clamped into the tooth platform 101 of the base 1, and at the moment, the structure enters a self-locking state. The nut 2 assembly is continuously rotated clockwise, the stop pin 4 overcomes the force application spring 5 to continuously move upwards, the movement direction of the stop pin 4 can only move upwards along the movement direction of the gear stage 101 and cannot move in the opposite direction, and therefore the threaded connection structure is guaranteed to achieve the self-locking function.
In some possible embodiments, the self-locking nut assembly comprises a blanking cover 6 assembled on the pin hole, the projection of the blanking cover 6 is of a T-shaped structure, the vertical part of the blanking cover 6 penetrates into the pin hole to form the upper boss, and the transverse straight part of the blanking cover 6 is positioned on the upper surface of the nut 2.
In some possible embodiments, the top of the retaining pin 4 is provided with a screw cap 403.
In some possible embodiments, the upper part of the retaining pin 4 is provided with an indicating scale 402. The stop pin 4 in the self-locking nut assembly is influenced by the inclination angle of the moving surface of the gear stage 101 to be acted on by a force opposite to the circumferential tangential movement direction of the nut 2, and at this time, the structure generates moment and grows linearly as the force-applying spring 5 is continuously compressed.
The thread connecting structure can realize fixed force, and the principle is as follows:
the real-time tightening torque of the nut 2 is M, and the self-locking force nut 2 assembly comprises two stop pins 4 according to the formula:
M = 2（L×F） = 2（L×tanα×k△x）；
f=reaction force of the nut 2 in the circumferential tangential direction;
l=arm length (distance between the axis of the stopper pin 4 and the axis of the nut 2);
k=the force spring 5 coefficient;
Δx=compression stroke of the apply spring 5;
α=the inclination angle of the tooth stage 101;
The determined arm length L, the deformation quantity Deltax of the force spring 5 and the angle alpha of the gear stage 101 are used for calculating the coefficient of the force spring 5 according to the following formula:
k = (G×d4 ) /（8×Nc×Dm3）；
g = the stiffness modulus of the wire;
d = wire diameter;
Nc=effective turns=n-2 (N is the total turns);
Dm=the diameter of the biasing spring 5.
The self-locking nut component can finally realize that the force of the force application spring 5 of the stop pin 4 is converted into the rotating moment of the nut 2 in the process of being in threaded connection with the base 1 by selecting and matching the force application spring 5 with a proper k value, and the moment applied at present is displayed in real time through the height value (read through the scale 402) of the stop pin 4 extending out of the end face of the nut 2, so that the fixed force requirement of the threaded connection structure is ensured. Aiming at the fact that the connection moment of the bolt in the limited space cannot be detected, the moment is visualized through the displacement of the stop pin 4 through the stress conversion in the structure.
In some possible embodiments, there are at least two pin holes and evenly distributed around the threaded hole.
In some possible embodiments, the movement surface is a bevel and the stop surface is a vertical surface.
In some possible embodiments, the outer wall of the vertical portion of the blanking cover 6 is provided with threads, and the inner wall of the upper portion of the pin bore is provided with threads, and the blanking cover 6 is in threaded connection with the pin bore. The diameter of the pin hole is larger than the outer diameter of the force application spring 5 and the maximum outer diameter of the stop pin 4, and after the plug cover 6 is separated from the pin cover, the stop pin 4, the force application spring 5 and other structures can be taken out, so that the structures can be detached.
The present invention can be well implemented according to the above-described embodiments. It should be noted that, based on the above structural design, in order to solve the same technical problems, even some insubstantial improvements made on the present invention fall within the protection scope of the present invention.
Claims (5)
1. The self-locking threaded connection structure is characterized by comprising a base and a self-locking nut component; the self-locking nut component comprises a nut, a stop pin and a force application spring;
The base is provided with an opening at the center for coaxially connecting the column-shaped body with threads; the upper surface of the base is provided with a plurality of tooth platforms which are arranged around the open holes and have the same structure and are arranged continuously, and each tooth platform consists of a moving surface and a stop surface; the moving surface is an inclined surface, and the stopping surface is a vertical surface;
The center of the nut is provided with a threaded hole, and the threaded hole is in threaded connection with the threaded columnar body; the nut is arranged above the base; the nut is provided with a pin hole with an axis parallel to the axis of the threaded hole, and a stop pin is penetrated in the pin hole;
The stop pin penetrates into the pin hole of the nut and is movably arranged in the pin hole, and can move up and down relative to the pin hole; the bottom of the stop pin is a pointed structure which is matched with the tooth platform on the base, the pointed structure of the stop pin can move from one tooth platform to the next tooth platform along the moving surface, and the pointed structure of the stop pin is limited by the stop surface to displace;
the force application spring is coaxially assembled with the stop pin and is positioned above the lower boss; an upper boss is arranged in the pin hole, and the upper end and the lower end of the force application spring are respectively contacted with the upper boss and the lower boss;
the upper part of the stop pin is provided with an indication scale, the stop pin extends out of the end face of the nut;
the application spring with proper k value is selected, so that the self-locking nut component can convert the application spring acting force of the stop pin into the rotation moment of the nut in the threaded connection process of the self-locking nut component and the current applied moment can be displayed in real time through the height value of the stop pin extending out of the end face of the nut;
The real-time tightening torque of the nut is M, and the self-locking force nut assembly comprises two stop pins according to the formula:
M = 2（L×F） = 2（L×tanα×k△x）；
F = reaction force of the nut in circumferential tangential direction;
L = moment arm length;
k=force spring rate;
Δx=biasing spring compression stroke;
α=inclination angle of the tooth table;
The force arm length L, the deformation quantity Deltax of the force spring and the gear stage angle alpha are determined according to the following formula of the force spring coefficient:
k = (G×d4 ) /（8×Nc×Dm3）；
g = the stiffness modulus of the wire;
d = wire diameter;
nc=effective turns=n-2, N being the total turns;
dm = apply spring pitch diameter.
2. The self-locking threaded connection according to claim 1, wherein the self-locking nut assembly comprises a blanking cover assembled on the pin hole, the projection of the blanking cover is of a T-shaped structure, the vertical portion of the blanking cover penetrates into the pin hole to form the upper boss, and the horizontal and straight portion of the blanking cover is located on the upper surface of the nut.
3. The self-locking threaded connection of claim 1, wherein the top of the retaining pin is provided with a nut.
4. The self-locking threaded connection of claim 1, wherein there are at least two pin holes and are evenly distributed around the threaded hole.
5. The self-locking threaded connection structure according to claim 2, wherein the outer wall of the vertical portion of the plug is provided with threads, the inner wall of the upper portion of the pin hole is provided with threads, and the plug is in threaded connection with the pin hole; the diameter of the pin hole is larger than the outer diameter of the force application spring and the maximum outer diameter of the stop pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410654425.8A CN118224172B (en) | 2024-05-24 | 2024-05-24 | Self-locking threaded connection structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410654425.8A CN118224172B (en) | 2024-05-24 | 2024-05-24 | Self-locking threaded connection structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN118224172A CN118224172A (en) | 2024-06-21 |
| CN118224172B true CN118224172B (en) | 2024-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202410654425.8A Active CN118224172B (en) | 2024-05-24 | 2024-05-24 | Self-locking threaded connection structure |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3499055A1 (en) * | 2017-12-14 | 2019-06-19 | Kipp Verpachtungen e.K. | Asymmetrical locking bolt with different rotating positions |
| CN220037219U (en) * | 2023-06-19 | 2023-11-17 | 温州大通金属制品有限公司 | Anti-reverse screw structure |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2920672A (en) * | 1954-09-17 | 1960-01-12 | Elastic Stop Nut Corp | Cylindrical cradle with floating nut and spring pin assembly means |
| DE102005014303B4 (en) * | 2005-03-30 | 2008-12-24 | Hofer-Pdc Gmbh | Rastiereinhiet for a shift shaft |
| KR101027753B1 (en) * | 2008-12-09 | 2011-04-08 | 이상철 | Combination Bolt-Nut Locks |
| US10288109B2 (en) * | 2009-11-05 | 2019-05-14 | Jpb Système | Self-locking screwing attachment device and assembly provided with same |
| CN203431075U (en) * | 2013-08-05 | 2014-02-12 | 常州南车铁马科技实业有限公司 | Brake disc for train |
| KR101535989B1 (en) * | 2015-05-20 | 2015-07-10 | 이상철 | Washer to prevent screw or nut loosening |
| CN207043709U (en) * | 2017-07-03 | 2018-02-27 | 上海上飞飞机装备制造有限公司 | A kind of pre-screwing nut frock of small space |
| CN207641487U (en) * | 2017-08-09 | 2018-07-24 | 广州鼎国生物技术有限公司 | A kind of novel western hybridization beaker |
| CN111637291A (en) * | 2020-06-12 | 2020-09-08 | 蒋建伟 | Mechanical locking device suitable for pipeline |
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2024
- 2024-05-24 CN CN202410654425.8A patent/CN118224172B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3499055A1 (en) * | 2017-12-14 | 2019-06-19 | Kipp Verpachtungen e.K. | Asymmetrical locking bolt with different rotating positions |
| CN220037219U (en) * | 2023-06-19 | 2023-11-17 | 温州大通金属制品有限公司 | Anti-reverse screw structure |
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| Publication number | Publication date |
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| CN118224172A (en) | 2024-06-21 |
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