CN103322007A - Anti-loosening thread structure - Google Patents
Anti-loosening thread structure Download PDFInfo
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- CN103322007A CN103322007A CN2013101976702A CN201310197670A CN103322007A CN 103322007 A CN103322007 A CN 103322007A CN 2013101976702 A CN2013101976702 A CN 2013101976702A CN 201310197670 A CN201310197670 A CN 201310197670A CN 103322007 A CN103322007 A CN 103322007A
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- thread
- arc surface
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- internal thread
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Abstract
The invention discloses an anti-loosening thread structure which comprises a bolt, a connecting piece and a connection main body. The bolt is provided with an external thread. The anti-loosening thread structure is characterized in that the connection main body is a nut or a tapping connecting piece, the tapping connecting piece is provided with a through hole, an internal thread is arranged in the through hole or a nut hole, an arc surface recessed inwards is arranged on one side of the root of the internal thread, and the bolt is in threaded connection with the nut or the tapping connecting piece from one side of the root provided with the arc surface. The anti-loosening thread structure has the advantages of being simple in structure, firm to connect and uniform in load.
Description
Technical field
The invention belongs to fastener areas, be specifically related to anti-loosening worm structure.
Background technique
Scyewed joint is connections of extensive use at engineering goods, but it in use always has loosening phenomenon because of vibration, the reason such as loose.Connect to become flexible and to cause serious consequence, so locking thread is a significant problem of puzzlement machinery industry always.As shown in Figure 1, when adopting plain nut, 60 degree V thread screws of normal conventional, thrust load is inhomogeneous in the distribution that screws between each circle of screw thread, count from nut seat, carried the load of 70-80% at its first thread engagement face and the second thread engagement face, and the load that later several Surface of action bears seldom, later on each circle successively decrease (such as Fig. 2).Since the regular screw threads fastening piece main stressed only be the one the second pitch thread contacting points of nut, all the other each teeth do not stress basically, therefore, when screw-down torque is larger, stress concentrates on the first pitch thread place, the first pitch thread is easy to produce bending and shear deformation, only in this way, the second pitch thread face is met with stresses and produces coupling mechanism force.By that analogy, the bearing load face transmits successively one by one with stressed, correspondingly causes screw thread shearing and wearing and tearing successively, and the shearing of each tooth and wear-out failure are very serious, cause the screw strength of nut significantly to descend, and finally produces sliding tooth.Theory analysis and evidence screw the number of turns more, and the degree of load skewness is also more remarkable, and after the 8th～10 circle, screw thread is subjected to load hardly.So, adopt the many high nuts of the number of turns, can not improve linking intensity.Like this, the regular screw threads fastening piece rotates with regard to being easy to overcome the coupling mechanism force on the screw thread surface of contact, and then gets loose under the operational vibration loading condiction.Here it is reason place that the regular screw threads fastening piece gets loose.Find after process studies for a long period of time, the key of the problem that gets loose of threaded fastener is the structure shape of screw thread.This worm structure is the arc surface that a uniqueness is arranged at the root of the tooth of internal thread.When assembling nut, the cusp of internal thread and male thread tightly withstands on the arc surface.Like this, just can prevent the loosening of scyewed joint pair that transverse vibration causes.
Summary of the invention
The present invention is intended to overcome the defective of prior art, provide a kind of simple in structure, be connected firmly, the uniform anti-loosening worm structure of load.
In order to solve the problems of the technologies described above, the invention provides following technological scheme:
Anti-loosening worm structure, comprise bolt, coupling, connection main body, described bolt is provided with outside thread, described connection main body is nut or tapping coupling, described tapping coupling has through hole, be provided with internal thread in described through hole or the nut bore, root of the tooth one side of described internal thread is provided with the arc surface that caves inward, and described bolt is provided with arc surface one side be threaded nut or tapping coupling from root of the tooth.
Described arc surface is 45 degree arc round angles, and the arc surface radius is thread pitch, and the arc surface center of circle is relative internal thread crest.
The internal thread normal pressure of described nut or tapping coupling equals 2 times of 60 degree screw thread normal pressure.
Compared with prior art, the present invention has following beneficial effect:
The present invention is applicable to a lot of aspects, such as automobile, and railway, oil, engineering machinery, medical apparatus, harbour machinery, the fields such as building Lightweight Steel Construction.Utilize the design's female thread structure, under the condition that does not affect screw thread connection strength, improve the self-locking property of scyewed joint, and the anti-loosening property under the oscillating load effect.And simple in structure, be easy to manufacturing, so that its manufacture cost reduces greatly, realize the purpose of synergy, help the raising of market share.Compare with standard thread, the design's internal thread and bolt shank are tensile buckling, help to reduce the spiral shell square difference in change of internal thread and bolt shank, thereby it is more even that load is distributed, and are not easy to be worn or rupture because of tired.Its main cause the first, point of contact concentrate on externally threaded crest place, rather than near the central diameter near the screw thread side, this meeting so that the matching property of screw thread contact greatly improved.Secondly, the crest of male thread be the top to an arc surface, rather than resemble regular screw threads and like that spend inclined-planes and contact with 60.Therefore, before loading, the axial motion of screw is very light.
Description of drawings
Fig. 1 is the existing schematic diagram that is threaded.
Fig. 2 is existing threaded load schematic.
Fig. 3 is the schematic diagram of the anti-loosening worm structure of the present invention.
Fig. 4 is the use phase diagram of the anti-loosening worm structure of the present invention.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for description and interpretation the present invention, is not intended to limit the present invention.
As shown in Figure 3, Figure 4, anti-loosening worm structure, comprise bolt 1, coupling 2, connect main body 3, described bolt 1 is provided with outside thread 5, and described connection main body 3 is nut or tapping coupling, described tapping coupling has through hole, be provided with internal thread 4 in described through hole or the nut, root of the tooth one side of described internal thread 4 is provided with the arc surface 6 that caves inward, and arc surface is 45 degree arc round angles, the arc surface radius is thread pitch, and the arc surface center of circle is relative internal thread crest.The arc surface of internal thread processes with screw tap or tap bolt, and screw tap is cut tap or thread forming tap.Internal thread cooperates with standard bolt, and its strength matching, accuracy of thread tolerance reach 6g or 6h.Resiliently deformable occurs in the corresponding position of the arc surface of described internal thread 4 and bolt screw part, helps to reduce the spiral shell square difference in change of internal thread and bolt shank, thereby it is more even that load is distributed, and screw thread is not easy to be worn or ruptures because of tired; Screw circle load in the situation that do not increase the front, making the back screw circle load increases, and has increased whole nut and has been subjected to loading capability, has strengthened the pretension effect.The internal thread normal pressure of described nut or tapping coupling equals 2 times of common 60 degree screw thread normal pressures.This internal thread is the internal thread with directivity, when its crest tightly withstands on the arc surface of internal thread, could produce self-locking action.Described bolt 1 is provided with arc surface one side be threaded nut or tapping coupling from root of the tooth, and the tapping coupling is sheet material or bulk.Bolt externally threaded crest place and arc surface close contact.Coupling 2 is between bolt 1 and connection main body 3.
Two represented power of arrow are P ɑ as can be seen from Figure 3, the normal pressure P=1P ɑ of 60 traditional degree angle screw threads; And internal thread has an arc surface owing to root of the tooth, and the angle of its normal pressure, size all change, normal pressure P=2P ɑ.Like this, this screw thread and tradition 60 degree screw threads, the ratio ≈ of the normal pressure of the two 12: 7; When bolt and nut was tightened mutually, the cusp of bolt just withstood on the arc surface of this screw thread tightly, thereby has produced very large coupling mechanism force.Because the Angulation changes of thread form, make to be applied to the normal force that the screw thread Contact produces and to become 60 degree angles with bolt axis, rather than 30 degree angles resemble regular screw threads, therefore, the locking frictional force that produces also just must increase greatly.
The arc surface that the design connects the main body internal thread can also eliminate the regular screw threads discontinuity, the problem such as kill of threading off.And internal thread is because structure is unique, all the bolt cusp withstands on the arc surface tightly, and the load that every tooth bears on the helix is all more even, and same load can be distributed on each face, each point, make that to produce locking frictional force on the screw thread everywhere close, can effectively resist transverse vibration.And this screw thread is stressed evenly, every tooth, all evenly bears load weekly. it has the unusual ability of anti-transverse vibration.
The present invention is applicable to a lot of aspects, such as automobile, and railway, oil, engineering machinery, medical apparatus, harbour machinery, the fields such as building Lightweight Steel Construction.In the future can also extend to wider suitable application area.Utilize the design's female thread structure, under the condition that does not affect screw thread connection strength, improve the self-locking property of scyewed joint, and the anti-loosening property under the oscillating load effect.And simple in structure, be easy to manufacturing, so that its manufacture cost reduces greatly, realize the purpose of synergy, help the raising of market share.Compare with standard thread, the design's internal thread and bolt shank are tensile buckling, help to reduce the spiral shell square difference in change of internal thread and bolt shank, thereby it is more even that load is distributed, and are not easy to be worn or rupture because of tired.Its main cause the first, point of contact concentrate on externally threaded crest place, rather than near the central diameter near the screw thread side, this meeting so that the matching property of screw thread contact greatly improved.Secondly, the crest of male thread be the top to an arc surface, rather than resemble regular screw threads and like that spend inclined-planes and contact with 60.Therefore, before loading, the axial motion of screw is very light.
The above only is the explanation embodiments of the present invention; be not limited to the present invention, for a person skilled in the art, within the spirit and principles in the present invention all; any modification of doing, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. anti-loosening worm structure, comprise bolt, coupling, connection main body, described bolt is provided with outside thread, it is characterized in that, described connection main body is nut or tapping coupling, and described tapping coupling has through hole, is provided with internal thread in described through hole or the nut bore, root of the tooth one side of described internal thread is provided with the arc surface that caves inward, and described bolt is provided with arc surface one side be threaded nut or tapping coupling from root of the tooth.
2. anti-loosening worm structure as claimed in claim 1 is characterized in that: described arc surface is 45 degree arc round angles, and the arc surface radius is thread pitch, and the arc surface center of circle is relative internal thread crest.
3. anti-loosening worm structure as claimed in claim 1 is characterized in that: the internal thread normal pressure of described nut or tapping coupling equals 2 times of 60 degree screw thread normal pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101976702A CN103322007A (en) | 2013-05-24 | 2013-05-24 | Anti-loosening thread structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013101976702A CN103322007A (en) | 2013-05-24 | 2013-05-24 | Anti-loosening thread structure |
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| CN103322007A true CN103322007A (en) | 2013-09-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013101976702A Pending CN103322007A (en) | 2013-05-24 | 2013-05-24 | Anti-loosening thread structure |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103742407A (en) * | 2013-12-23 | 2014-04-23 | 柳州正菱集团有限公司 | Anti-loosening gear pump |
| WO2015000317A1 (en) * | 2013-07-03 | 2015-01-08 | Xu Songlin | Anti-loosening cylindrical threaded part |
| TWI560003B (en) * | 2015-08-25 | 2016-12-01 | Kuo Chen Hung | Anti-loosen screw manufacturing method and screw member produced thereby |
| CN111853023A (en) * | 2020-07-20 | 2020-10-30 | 中船动力研究院有限公司 | Thread design method and thread connection structure |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4540321A (en) * | 1978-11-16 | 1985-09-10 | Microdot Inc. | Anti-vibration thread form |
| CN2672355Y (en) * | 2004-01-08 | 2005-01-19 | 张永华 | Full screwthread locking nut |
| CN1609465A (en) * | 2003-10-23 | 2005-04-27 | 比谷阿尔法股份有限公司 | Male and female screw threads, and cutter for female thread |
| CN101424295A (en) * | 2007-11-02 | 2009-05-06 | 通用汽车环球科技运作公司 | Thread profile modification for controlled stiffness |
| JP2012013133A (en) * | 2010-06-30 | 2012-01-19 | Nitto Seiko Co Ltd | Locking screw |
| CN202946514U (en) * | 2012-08-10 | 2013-05-22 | 青岛德才装饰安装工程有限公司 | Anti-loose self-locking nut and bolt |
-
2013
- 2013-05-24 CN CN2013101976702A patent/CN103322007A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4540321A (en) * | 1978-11-16 | 1985-09-10 | Microdot Inc. | Anti-vibration thread form |
| CN1609465A (en) * | 2003-10-23 | 2005-04-27 | 比谷阿尔法股份有限公司 | Male and female screw threads, and cutter for female thread |
| CN2672355Y (en) * | 2004-01-08 | 2005-01-19 | 张永华 | Full screwthread locking nut |
| CN101424295A (en) * | 2007-11-02 | 2009-05-06 | 通用汽车环球科技运作公司 | Thread profile modification for controlled stiffness |
| JP2012013133A (en) * | 2010-06-30 | 2012-01-19 | Nitto Seiko Co Ltd | Locking screw |
| CN202946514U (en) * | 2012-08-10 | 2013-05-22 | 青岛德才装饰安装工程有限公司 | Anti-loose self-locking nut and bolt |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015000317A1 (en) * | 2013-07-03 | 2015-01-08 | Xu Songlin | Anti-loosening cylindrical threaded part |
| CN103742407A (en) * | 2013-12-23 | 2014-04-23 | 柳州正菱集团有限公司 | Anti-loosening gear pump |
| TWI560003B (en) * | 2015-08-25 | 2016-12-01 | Kuo Chen Hung | Anti-loosen screw manufacturing method and screw member produced thereby |
| CN111853023A (en) * | 2020-07-20 | 2020-10-30 | 中船动力研究院有限公司 | Thread design method and thread connection structure |
| CN111853023B (en) * | 2020-07-20 | 2022-03-11 | 中船动力研究院有限公司 | Thread design method and thread connection structure |
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Application publication date: 20130925 |
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