CN111442024A - Self-tightening anti-loose fastening device - Google Patents
Self-tightening anti-loose fastening device Download PDFInfo
- Publication number
- CN111442024A CN111442024A CN202010395046.3A CN202010395046A CN111442024A CN 111442024 A CN111442024 A CN 111442024A CN 202010395046 A CN202010395046 A CN 202010395046A CN 111442024 A CN111442024 A CN 111442024A
- Authority
- CN
- China
- Prior art keywords
- thread
- self
- bolt
- nut
- tooth
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 9
- 230000007547 defect Effects 0.000 description 5
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000006378 damage Effects 0.000 description 4
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004677 Nylon Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- 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
- F16B39/30—Locking exclusively by special shape of the screw-thread
-
- 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
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Bolts, Nuts, And Washers (AREA)
- Connection Of Plates (AREA)
Abstract
The invention discloses a self-tightening anti-loosening fastening device, which aims to improve the anti-loosening performance of the device, reduce the manufacturing cost of products and meet the requirements of high standard, high safety and complex working condition environments. The self-tightening bolt comprises a bolt and a self-tightening nut, wherein the bolt is provided with a common and standard external thread; the self-tightening nut consists of two sections of continuous deformed threads with self-tightening effect, the front section of deformed threads play a role in fastening, and the rear section of deformed threads play a role in keeping the anti-loosening capacity increased; the self-tightening nut is matched and connected with the bolt to clamp the workpiece more and more tightly, or a certain pretightening force is provided at any position of the bolt. The technical scheme of the invention can bring reliable anti-seismic and anti-loosening performance, remarkably improve the manufacturing cost, the reuse rate and the service life of the nut, ensure that thread pairs in all links are not loosened under various severe working environments such as frequent vibration, load change and the like, play a real anti-loosening and locking effect and have wide application range.
Description
Technical Field
The invention relates to a locknut device, and belongs to the technical field of locking and fastening workpieces.
Background
In production life, the fastener is usually not separated in the connecting and assembling process, and the fastener brings convenience to the mechanical industry. In the connection fitting, a bolt-nut connection is the most commonly used fastening structure. The machinery that adopts bolt and nut fastener is at the in-service use in-process, because the influence of complicated operating mode, the bolt and nut inevitably can drop by oneself in the environment of frequent vibration and alternating load to cause the use danger.
In order to solve the problem of loosening of the fastening device, scientists and engineers in many countries in the world make a lot of experimental researches, and the anti-loosening fastening device originates abroad, generally adopts methods such as locking plates, pins, nylon embedding, deformed threads, chemical glue coating and the like, delays the time for the self-loosening of the fastening device to a certain extent, but does not solve the problem fundamentally. The prior anti-loosening methods in China are various, wherein the anti-loosening method is not detachable, the detachable threaded connection is changed into the non-detachable threaded connection by adopting modes such as welding, bonding or punching point riveting, and the like, the anti-loosening method belongs to a reliable traditional anti-loosening method, but the defects are obvious, namely, the threaded fastener cannot be repeatedly used, and the operation is very troublesome during the installation and the disassembly. The other method is to adopt a mechanical fixing piece for loosening prevention, and the principle is to utilize the mechanical fixing piece to fix and pin between a threaded piece and a connected piece or between the threaded piece and the threaded piece so as to prevent loosening. The anti-loosening method has poor reliability, does not fundamentally solve the problems, has multiple potential safety hazards, and is difficult to adapt to the requirements of high standard, high safety and other complex environmental conditions.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a self-tightening anti-loosening fastening device, which achieves the purpose of more excellent and reliable anti-loosening by improving the structure of a nut threaded part.
The invention specifically adopts the following technical scheme:
the self-tightening anti-loose fastening device comprises a bolt and a nut; the nut is connected with the bolt through threads, the inner hole thread of the nut is composed of two sections of continuous deformation threads with the same pitch, the deformation structure and the deformation mode of the front section deformation threads and the rear section deformation threads are different, the pitch diameter of the front section deformation threads is larger than that of the rear section deformation threads, the front section deformation threads are provided with wedge angles, and the rear section deformation threads are provided with trapezoidal angles.
Furthermore, the front section of deformed thread is a thread-type angular deformed thread, a wedge-shaped inclined plane is arranged at the root of the thread, the angle (wedge angle) between the wedge-shaped inclined plane and the axis is smaller than the thread angle, and the pitch diameter of the section of internal thread is the same as that of the common thread; when the nut and the bolt are mutually screwed to compress a workpiece, the tooth point of the external thread of the bolt can tightly prop against the wedge-shaped inclined plane of the front section deformed thread, so that a larger locking force is generated. Because the angle of the tooth shape is changed, the normal force generated by the contact between the threads is increased, so the normal pressure of the front section deformed threads is far greater than the fastening pressure, and the generated anti-loosening friction force is also greatly increased. Meanwhile, when the external thread of the bolt is meshed with the deformed internal thread of the front section of the nut, the load is uniformly distributed on the full length of the contacted spiral line section by the wedge-shaped inclined surface, and more than 80% of total load is prevented from being intensively acted on thread surfaces of the first and second teeth when the common thread is meshed, so that the defect that the common standard coupling pair is easy to loosen in a vibration environment is overcome.
Furthermore, the rear section deformed thread is a tooth-shaped angular deformed thread, a trapezoidal angle is arranged at the tooth bottom of the rear section deformed thread, the angle between a trapezoidal tooth edge and a tooth-shaped central axis (trapezoidal tooth angle) is smaller than the original tooth angle, the pitch diameter of the section of internal thread is smaller than the pitch diameter value of the thread of the matched bolt, and the optimal value is 0.05mm-0.2 mm; when the nut and the bolt are screwed or the workpiece is pressed tightly, the two sides of the thread of the external thread of the bolt can be tightly attached to the two sides of the thread of the rear-section deformed thread, so that large friction force and locking force are generated.
Because the pitch diameter of the section of the thread is reduced, interference exists between the section of the thread and the external thread of the bolt, and the friction force and the anti-loosening locking force generated by the thread connecting surface are gradually increased along with the increase of the interference; then the pitch diameter diminishes and can make this section internal thread major diameter diminish (be less than the big footpath of connecting bolt external screw thread), can oppress the cusp of junction bolt external screw thread and make its deformation destroy even, and the space that the trapezoidal angular form of kerve design formed effectively avoids the destruction to bolt external screw thread cusp, and has increased the flexible space that interference magnitude arouses the deformation.
When the bolt thread is meshed with the rear section deformation thread of the nut, the section deformation thread coupling pair overcomes the defect that a common standard coupling pair is easy to loosen in a vibration environment, simultaneously has a protection effect on the external thread of the bolt, and prolongs the service life.
Furthermore, the outer peripheral shapes of the front section deformed thread part and the rear section deformed thread part of the nut are different, the nut is directional when being fastened, the end face of the front section deformed thread part is in contact with a workpiece, and the change of the outer peripheral shape of the nut can be effectively distinguished.
The working principle of the invention is that the two sections of the inner hole thread of the nut are continuous deformed threads with the same pitch, and the wedge-shaped surface arranged at the front section increases the normal force, thereby greatly improving the capability of the nut to resist vibration and cause loosening during fastening; the interference magnitude of the trapezoidal angle arranged at the rear section and 0.05mm-0.2mm ensures that the nut forms frictional resistance generated by interference at any position of the bolt or when fastening a workpiece, and simultaneously the trapezoidal angle for preventing the damage to the external thread of the bolt is designed; when the friction anti-loosening locking force formed by the two sections of threads is mutually superposed and enhanced, good anti-loosening capability is inevitably formed.
By adopting the technical scheme, the invention can realize the following technical effects:
1. reliable anti-seismic and anti-loosening performance: the invention can realize double locking, namely on one hand, the locking is carried out by increasing the normal force of the wedge-shaped surface of the deformed thread at the front section of the nut, and on the other hand, the locking is carried out by increasing the interference magnitude of the deformed thread at the rear section of the nut, so that double self-locking and self-tightening are realized when the nut realizes the locking of the bolt, and the performance of anti-seismic and anti-loosening is better realized.
2. According to the principle of the invention, the bolt can be locked without destroying the thread pair structure, so that the service lives of the nut and the bolt can be obviously prolonged.
3. Can be repeatedly used: the design of the trapezoidal deformation angle at the rear section of the nut plays a role in protecting the outer teeth of the bolt and providing space for deformation, so that the bolt can be repeatedly used.
4. Without any auxiliary locking elements such as spring washers, stop washers, etc. The fastening device can achieve the purpose of complete self-locking without any external auxiliary element.
5. The product cost can be greatly reduced, and the market occupation space is improved.
6. The invention belongs to a fastening device of a matching type, and the specification and model adopt standard sizes and are matched with standard external threads.
7. The invention is not influenced by the severe temperature change, can be widely applied to parts requiring a self-locking function, such as self-locking parts requiring high requirements of high-speed railways, spaceflight, ships, automobiles and the like, and can be set according to the actual requirements.
8. Any metal and nonmetal can be selected, and the material, the shape and the dimension are not limited.
9. Can realize the same locking force of screwing in and screwing out, and achieve the purpose of not loosening the nut
Drawings
FIG. 1 is a view showing the structure of the apparatus of the present invention
FIG. 2 is a schematic view of a thread pair according to the present invention
FIG. 3 is a schematic view of a front deformed thread according to the present invention
FIG. 4 is a rear deformed thread view of the present invention
FIG. 5 is a schematic view of an embodiment of the present invention
Detailed Description
To facilitate an understanding and practice of the invention by those skilled in the art, the invention is described in further detail below with reference to the accompanying drawings and the detailed description.
As shown in fig. 1, 2, 3 and 4, the device is a self-tightening anti-loose fastening device, which comprises a bolt and a nut; the nut is connected with the bolt through threads, the inner hole thread of the nut is composed of two sections of continuous deformation threads with the same pitch, the deformation structure and the deformation mode of the front section deformation threads and the rear section deformation threads are different, the pitch diameter of the front section deformation threads is larger than that of the rear section deformation threads, the front section deformation threads are provided with wedge angles, and the rear section deformation threads are provided with trapezoidal angles.
Example 1:
as shown in fig. 1 and 5, the screw thread of the bolt is a standard screw thread of 60 degrees, and the pitch diameter of the common internal screw thread of the front section of the nut is 60 degrees and is the same as that of the common screw thread; the angle (wedge angle) between the wedge-shaped inclined plane and the axis of the front section deformed thread is 48 degrees; when the nut and the bolt are mutually screwed to press a workpiece, the tooth point of the external thread of the bolt can tightly abut against the wedge-shaped inclined plane of the front section deformed thread to form a normal pressure increasing part, so that the normal force generated by the contact between the threads is increased, the normal pressure of the front section deformed thread is far greater than the fastening pressure, and the generated anti-loosening friction force is greatly increased; meanwhile, when the external thread of the bolt is meshed with the deformed internal thread of the front section of the nut, the load is uniformly distributed on the full length of the contacted spiral line section by the wedge-shaped inclined surface, and more than 80% of total load is prevented from being intensively acted on thread surfaces of the first and second teeth when the common thread is meshed, so that the defect that the common standard coupling pair is easy to loosen in a vibration environment is overcome.
The rear section deformed thread is a 60-degree deformed thread, the pitch diameter of the thread is less than the pitch diameter value of the thread of the matched bolt by 0.1mm, and a 15-degree trapezoidal thread angle is arranged at the tooth bottom of the thread; when the nut and the bolt are screwed at any position or tightly press a workpiece, interference exists between the nut and the bolt and the external thread of the bolt, two side surfaces of the thread form of the 60-degree thread section of the deformed thread can be tightly attached to the two side surfaces of the thread form of the 60-degree thread of the bolt, and the friction force and the anti-loosening locking force generated along with the increase of the interference are gradually increased; then the pitch diameter diminishes and can make this section internal thread major diameter diminish (be less than the big footpath of connecting bolt external screw thread), can oppress the cusp of junction bolt external screw thread and make its deformation destroy even, and the space that the 15 trapezoidal angles of root design formed can effectively avoid the destruction to bolt external screw thread cusp, and can increase the elastic expansion space that magnitude of interference arouses the deformation.
Two sections of continuous deformed threads with the same pitch are arranged on the inner hole thread of the nut, and a 48-degree wedge-shaped surface is arranged on the front section of the deformed threads to increase the normal force, so that the looseness capacity caused by the shock resistance of the nut during fastening is greatly improved; the rear section is provided with a 15-degree trapezoidal angle and a magnitude of interference of 0.1mm, so that the nut forms frictional resistance caused by interference at any position of the bolt or when a workpiece is fastened, and meanwhile, the trapezoidal angle for preventing the damage to the external thread of the bolt is designed; when the friction anti-loosening locking force formed by the two sections of threads is mutually superposed and enhanced, good anti-loosening capability is inevitably formed.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the spirit of the present invention, and these modifications and decorations should also be regarded as being within the scope of the present invention.
Claims (7)
1. From locking fastener of compact form, including bolt, nut, the nut passes through cooperation threaded connection, its characterized in that with the bolt:
the nut inner hole thread is composed of two sections of continuous deformation threads with the same tooth pitch, the deformation structure and the deformation mode of the front section deformation threads and the rear section deformation threads are different, the pitch diameter of the front section deformation threads is larger than that of the rear section deformation threads, the front section deformation threads are provided with wedge angles, and the rear section deformation threads are provided with trapezoidal angles.
2. The self-clinching anti-loose fastener of claim 1, wherein: the front section deformed screw thread is a tooth-shaped angular deformed screw thread, and a wedge-shaped inclined plane is arranged at the tooth bottom of the front section deformed screw thread.
3. The self-clinching anti-loose fastener of claim 2, wherein: the angle (wedge angle) between the wedge-shaped inclined plane and the axis is smaller than the tooth corner.
4. The self-clinching anti-loose fastener of claim 1, wherein: the rear section deformed thread is a tooth-shaped angular deformed thread, and a trapezoidal tooth surface is arranged at the tooth bottom of the rear section deformed thread.
5. The self-clinching anti-loose fastener of claim 4, wherein: the angle (trapezoidal tooth angle) between the trapezoidal tooth edge and the tooth-shaped central axis is smaller than the original tooth angle.
6. The self-clinching anti-loose fastener of claim 1, wherein: the pitch diameter of the front section deformed thread is the same as that of the common thread; the pitch diameter of the rear-section deformed thread is smaller than the pitch diameter value of the thread of the matched bolt by 0.05mm-0.2 mm.
7. The self-clinching anti-loose fastener of claim 1, wherein: the outer peripheral shapes of the front section deformed thread part and the rear section deformed thread part of the nut are different.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395046.3A CN111442024A (en) | 2020-05-11 | 2020-05-11 | Self-tightening anti-loose fastening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010395046.3A CN111442024A (en) | 2020-05-11 | 2020-05-11 | Self-tightening anti-loose fastening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111442024A true CN111442024A (en) | 2020-07-24 |
Family
ID=71652039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010395046.3A Pending CN111442024A (en) | 2020-05-11 | 2020-05-11 | Self-tightening anti-loose fastening device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111442024A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496249A (en) * | 2020-11-11 | 2021-03-16 | 嘉兴联控汽车部件有限公司 | Processing technology of high-temperature-resistant anti-loosening bolt |
-
2020
- 2020-05-11 CN CN202010395046.3A patent/CN111442024A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112496249A (en) * | 2020-11-11 | 2021-03-16 | 嘉兴联控汽车部件有限公司 | Processing technology of high-temperature-resistant anti-loosening bolt |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2001512807A (en) | Fasteners with low tolerance threads | |
| CN111173830A (en) | Composite locknut | |
| CN106351936A (en) | Axially compressed looseproof fastening device | |
| CN209705058U (en) | Check bolt nut assembly | |
| CN111442024A (en) | Self-tightening anti-loose fastening device | |
| CN209781425U (en) | Anti-loosening bolt group | |
| CN109595247B (en) | Self-locking check bolt and installation method thereof | |
| CN102678726A (en) | Detachable anti-loosing component for screws | |
| CN214007745U (en) | Self-tightening anti-loose fastening device | |
| CN211820309U (en) | Anti-loosening bolt | |
| CN112555266A (en) | Anti-loose bolt group consisting of nut with elastic bulge and gasket with spiral lifting groove | |
| US7828500B2 (en) | Threaded engagement element with self-locking threads | |
| CN214661426U (en) | Check bolt group with internal thread regular polygon gasket | |
| CN210290449U (en) | Anti-loose nut | |
| CN110821938A (en) | Anti-loosening fastening bolt | |
| CN211623929U (en) | Elastic thread anti-loosening fastening device | |
| CN112727896A (en) | Elastic self-locking nut | |
| CN211398220U (en) | Ratchet wedge surface locking nut | |
| CN212455138U (en) | Functional bolt | |
| CN209539772U (en) | A kind of antivibration check bolt nut assembly | |
| CN1019408B (en) | Screw head type lock washer | |
| CN218625003U (en) | Boss self-locking fastener | |
| CN216554870U (en) | Self-tightening anti-loosening nut | |
| CN110617264A (en) | Elastic thread anti-loosening fastening device | |
| CN215214321U (en) | Elastic self-locking nut |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |