CN114110000B - Anti-loosening device for back-threaded nut - Google Patents
Anti-loosening device for back-threaded nut Download PDFInfo
- Publication number
- CN114110000B CN114110000B CN202111434638.2A CN202111434638A CN114110000B CN 114110000 B CN114110000 B CN 114110000B CN 202111434638 A CN202111434638 A CN 202111434638A CN 114110000 B CN114110000 B CN 114110000B
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- Prior art keywords
- nut
- shrink sleeve
- thread
- external
- shrink
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- 230000000694 effects Effects 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
- F16B39/36—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 with conical locking parts, which may be split, including use of separate rings co-operating therewith
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Connection Of Plates (AREA)
Abstract
The invention discloses a back-thread nut locking device, which comprises an outer nut and a shrink sleeve; the internal thread of the external nut is conical internal thread; the shrink sleeve comprises a shrink sleeve outer hexagon, a shrink sleeve shrink joint, a shrink sleeve inner thread and a shrink sleeve outer thread; the shrinkage joint of the shrinkage sleeve is a full-open through groove; the shrink sleeve internal thread is a cylindrical internal thread and is matched with the bolt external thread; the shrink sleeve external thread is conical external thread and is matched with the external nut internal thread; the internal thread of the shrink sleeve and the external thread of the shrink sleeve are opposite in screw direction; after the anti-loose device for the back-threaded nut is fastened, the thread gaps can be completely matched tightly, and the structure is stable in performance under the action of external forces such as vibration, impact and the like.
Description
Technical Field
The invention belongs to the technical field of fasteners, and particularly relates to a back-threaded nut anti-loosening device.
Background
The screw connection generally cannot loosen under the static working condition, but under the action of external forces such as vibration, impact and the like received in the actual use, the loosening pretightening force of the bolt and the nut is reduced, and the safety accident is caused. The safety and reliability of the connection of the bolts and the nuts are ensured, and the looseness prevention of the nuts is one of important problems of the research of various fastener enterprises.
At present, the friction anti-loose nut is the most widely applied one, mainly comprises a double nut, a thread coating binder, thread deformation, an eccentric distance nut and the like, the design concept is characterized in that the friction coefficient is increased on the structural design, the pretightening force error is large under the condition of the same torque, and the pretightening force is uneven, so that the reliability of equipment connection is reduced; the eccentric distance nut can apply huge radial shearing force to the bolt, so that the threads are unevenly stressed, and the requirements on the materials and the processing precision of the bolt and the nut are high, so that the supply range of the nut is greatly limited. The design and the processing of the bolts and the nuts are just for playing a role in fastening, if other functions such as looseness prevention of the bolts and the nuts are additionally added, the problems of poor accuracy of pretightening force, uneven stress of threads and the like tend to occur.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a back-threaded nut locking device, which effectively solves the problems of poor accuracy of pretightening force and uneven thread stress of the existing thread locking structure.
The invention provides the following technical scheme: a back-thread nut locking device comprises an outer nut and a shrinkage sleeve; the internal thread of the external nut is conical internal thread; the shrink sleeve comprises a shrink sleeve outer hexagon, a shrink sleeve shrink joint, a shrink sleeve inner thread and a shrink sleeve outer thread; the shrinkage joint of the shrinkage sleeve is a full-open through groove; the shrink sleeve internal thread is a cylindrical internal thread and is matched with the bolt external thread; the shrink sleeve external thread is conical external thread and is matched with the external nut internal thread; and the internal thread of the shrink sleeve and the external thread of the shrink sleeve are opposite in screw direction.
Compared with the prior art, the invention has the beneficial effects that:
1. after the anti-loose device for the back-threaded nut is fastened, the thread gaps can be completely matched tightly, and the structure is stable in performance under the action of external forces such as vibration, impact and the like.
2. The outer nut is adjacent to the fastening nut after being locked with the shrink sleeve, the screw thread is opposite to the fastening nut in rotation direction, and the fastening nut can be prevented from rotating and loosening after being screwed.
3. According to the embodiment, the anti-loosening device can be added on the existing fastening nut, so that the accuracy of the existing pretightening force and the uniformity of the stress of the threads are ensured, and the use safety of the nut is greatly improved.
4. The anti-loosening device for the anti-loosening nut is directly additionally arranged on the existing structural connection without replacing bolts and nuts, so that the anti-loosening modification of the nut can be realized, the installation is simple, and the application is wide.
Drawings
Fig. 1 is a schematic structural view of a back-threaded nut locking device.
Fig. 2 is a schematic structural view of the shrink sleeve.
Fig. 3 is a cross-sectional view of the shrink sleeve.
Fig. 4 is a cross-sectional view of the outer nut.
Fig. 5 is a cross-sectional view of a structural connection of the present invention.
1. The external nut, 2 shrink sleeve, 3 fastening nut, 4 bolt, 5 bolt external screw thread, 6 shrink sleeve external hexagonal, 7 shrink sleeve external screw thread, 8 shrink sleeve shrink joint, 9 shrink sleeve internal screw thread, 10 external nut internal screw thread.
Detailed Description
The present invention is described in further detail below with reference to the drawings and examples to enable those skilled in the art to practice the invention by referring to the description. But should not be used to limit the scope of the invention.
As shown in fig. 1 to 5, the present invention provides a back-threaded nut locking device comprising an outer nut 1 and a shrink sleeve 2; the internal thread of the outer nut 1 is conical internal thread; the shrink sleeve 2 comprises a shrink sleeve outer hexagon 6, a shrink sleeve shrink joint 8, a shrink sleeve inner thread 9 and a shrink sleeve outer thread 7; the shrinkage joint 8 of the shrinkage sleeve is a full-open through groove; the shrink sleeve internal thread 9 is a cylindrical internal thread and is matched with the bolt external thread 5; the shrink sleeve external thread 7 is conical external thread and is matched with the external nut internal thread 10; the shrink sleeve internal thread 9 and the shrink sleeve external thread 7 are in opposite screw threads.
The working principle of the technical scheme is as follows:
when the anti-screw nut anti-loosening device is used, an installer manually screws the shrink sleeve 2 into the outer nut 1, then integrally screws the anti-screw nut anti-loosening device downwards along the bolt 4, so that the lower end of the outer nut 1 is tightly attached to the fixed nut 3, then the outer nut 1 is continuously rotated by a tool, at the moment, the outer nut 1 is tightly attached to the fixed nut 3 and cannot move downwards, the shrink sleeve 2 is driven by the rotating force to enter the outer nut 1, the shrink sleeve 2 is tightly shrunk to tightly hold the bolt 4 after being fastened, a wedge effect is generated, the threads of the shrink sleeve and the screw nut are tightly matched, and the structure is stable under the action of external forces such as vibration, impact and the like. The external nut 1 is adjacent to the fastening nut 3 after locking the shrink sleeve 2 and bears the loosening force of the fastening nut 3 due to the action of external force, the screwing direction of the external nut 1 is opposite to that of the fastening nut 3, and the structure can effectively prevent the fastening nut 3 from loosening due to different screwing directions.
Compared with the prior art, the beneficial effects of the embodiment are as follows:
1, after the anti-loose device for the back-threaded nut is fastened, the thread gaps can be completely matched tightly, and the structure is stable in performance under the action of external forces such as vibration, impact and the like.
And 2, the outer nut is adjacent to the fastening nut after being locked with the shrink sleeve, the screw thread is opposite to the fastening nut in screwing direction, and the fastening nut can be prevented from rotating and loosening after being screwed.
3, this embodiment can increase locking device on current fastening nut, has guaranteed the accuracy of current pretightning force and the atress of screw thread even, has improved the security that the nut used by a wide margin.
4, the existing structural connection is not required to be replaced by bolts and nuts, and the anti-loosening device for the anti-loosening nut can be directly additionally arranged, so that the anti-loosening modification of the nut can be realized, the installation is simple, and the application is wide.
Claims (1)
1. A back-thread nut locking device comprises an outer nut and a shrinkage sleeve; the internal thread of the external nut is conical internal thread, the shrink sleeve comprises a shrink sleeve external hexagonal, a shrink sleeve shrink joint, a shrink sleeve internal thread and a shrink sleeve external thread, the shrink sleeve shrink joint is a full-open through groove, and the shrink sleeve internal thread is cylindrical internal thread and is matched with the bolt external thread; the shrink sleeve external thread be circular cone external thread to with outer nut internal thread phase-match, shrink sleeve internal thread and shrink sleeve external thread screw-thread are opposite, the installer will shrink sleeve (2) manual screw-in outer nut (1), then with the whole down precession of anti-screw nut locking device along bolt (4), make outer nut (1) lower extreme paste tightly solid nut (3), then continue rotatory outer nut (1) with the instrument, at this moment outer nut (1) has pasted tightly solid nut (3) and can not move down, rotatory power will drive shrink sleeve (2) and get into outer nut (1), shrink sleeve (2) shrink and hold tightly bolt (4) and produce the wedge effect after the fastening, the tight fit of both screw-thread clearance, the performance is stable under external force such as being influenced by vibration, outer nut (1) locking shrink sleeve (2) is adjacent and bear the loosening force that fastening nut (3) produced because of the effect of fastening nut (3) screw-in the contrary with the instrument, can prevent the nut (3) to loosen effectively because of this different rotation to the external force that fastens nut (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111434638.2A CN114110000B (en) | 2021-11-29 | 2021-11-29 | Anti-loosening device for back-threaded nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111434638.2A CN114110000B (en) | 2021-11-29 | 2021-11-29 | Anti-loosening device for back-threaded nut |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114110000A CN114110000A (en) | 2022-03-01 |
| CN114110000B true CN114110000B (en) | 2023-12-22 |
Family
ID=80371247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111434638.2A Active CN114110000B (en) | 2021-11-29 | 2021-11-29 | Anti-loosening device for back-threaded nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114110000B (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB174227A (en) * | ||||
| FR1309150A (en) * | 1962-01-06 | 1962-11-09 | Servomecanismos | Improvement in assembly systems using complementary threaded elements |
| US5582496A (en) * | 1995-02-24 | 1996-12-10 | Top Lock Technology | Top lock jam nut apparatus and method |
| JP2007040347A (en) * | 2005-08-01 | 2007-02-15 | Nobuhiko Futagawa | Self-locking nut |
| CN102003450A (en) * | 2009-09-02 | 2011-04-06 | 淮南矿业(集团)有限责任公司 | Anti-looseness self-locking device with threaded connection and method |
| CN202170921U (en) * | 2011-06-21 | 2012-03-21 | 许昌四达电力设备有限公司 | Self-jam nut |
| JP2015075235A (en) * | 2013-10-08 | 2015-04-20 | 栗原 信彦 | Fastening member |
| CN107740807A (en) * | 2017-11-29 | 2018-02-27 | 忻建国 | A kind of combination stop nut locked using tapered thread |
| CN212959473U (en) * | 2020-08-12 | 2021-04-13 | 浙江屹腾金属制品有限公司 | Anti-loose nut |
-
2021
- 2021-11-29 CN CN202111434638.2A patent/CN114110000B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB174227A (en) * | ||||
| FR1309150A (en) * | 1962-01-06 | 1962-11-09 | Servomecanismos | Improvement in assembly systems using complementary threaded elements |
| US5582496A (en) * | 1995-02-24 | 1996-12-10 | Top Lock Technology | Top lock jam nut apparatus and method |
| JP2007040347A (en) * | 2005-08-01 | 2007-02-15 | Nobuhiko Futagawa | Self-locking nut |
| CN102003450A (en) * | 2009-09-02 | 2011-04-06 | 淮南矿业(集团)有限责任公司 | Anti-looseness self-locking device with threaded connection and method |
| CN202170921U (en) * | 2011-06-21 | 2012-03-21 | 许昌四达电力设备有限公司 | Self-jam nut |
| JP2015075235A (en) * | 2013-10-08 | 2015-04-20 | 栗原 信彦 | Fastening member |
| CN107740807A (en) * | 2017-11-29 | 2018-02-27 | 忻建国 | A kind of combination stop nut locked using tapered thread |
| CN212959473U (en) * | 2020-08-12 | 2021-04-13 | 浙江屹腾金属制品有限公司 | Anti-loose nut |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114110000A (en) | 2022-03-01 |
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