CN2921415Y - Self-locking helix screw-thread fastening - Google Patents
Self-locking helix screw-thread fastening Download PDFInfo
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- CN2921415Y CN2921415Y CN 200520045825 CN200520045825U CN2921415Y CN 2921415 Y CN2921415 Y CN 2921415Y CN 200520045825 CN200520045825 CN 200520045825 CN 200520045825 U CN200520045825 U CN 200520045825U CN 2921415 Y CN2921415 Y CN 2921415Y
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Abstract
The utility model discloses a self-locking helix screw-thread fastening, which comprises a bolt and a nut, which are connected together through the screw-thread. The nut is provided with the female screw. The utility model is characterized in that a wedge bevel is arranged at the root of tooth of the female screw, and that the crest of the male thread of the bolt leans against the wedge slope. The wedge bevel is at a slop of 30 degrees with the central line of the nut. With the wedge bevel arranged at the root of tooth of the female screw, the utility model produces very strong locking force, for the crest of the screw that leans against the bevel tightly when the nut and the bolt are mutually tight screwed. Therefore, the produced lock friction is inevitably increased to form the real self-locking function. No other adjuvant lock measures are needed in the adoption of the fastening of the utility model. Furthermore, the nut can be used repeatedly, without lessening of the locking force.
Description
Technical field
The utility model relates to a kind of fastening piece that various machines and parts are linked and packed that is used for, and relates in particular to a kind of helical threaded fasteners that has auto-lock function.
Background technique
Various machines and parts be unable to do without fastening piece in being linked and packed.Fastening piece has brought convenience to mechanical industry, and the normal conventional threaded fastener mostly is 60 degree triangular threads, carried 70～80% load at its first thread engagement face and the second thread engagement face, and the load that later several Surface of action bears seldom.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 big, stress concentrates on the first screw thread place, 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 cause screw thread shearing and wearing and tearing successively, the shearing of each tooth and wear-out failure are very serious, cause the screw strength of nut to descend significantly, the final generation slided tooth, and rotates, and then gets loose.Here it is reason place that the regular screw threads fastening piece gets loose.Getting loose of threaded fastener can cause parts or a complete device to damage, disintegrate so that lead to a disaster.
For solving the problem that gets loose of fastening piece, be born from threaded fastener, the scientific research personnel of many countries has done a large amount of tests and research in the world, they adopt methods such as locking plate, pin, nylon embed, distortion screw thread, chemical gluing, delay the time that fastening piece can get loose voluntarily to a certain extent, but fundamentally do not solved the problem that gets loose.
Therefore, design a kind of threaded fastener that can self-locking, the phenomenon that gets loose of improving fastening piece becomes the technical barrier that those skilled in the art press for solution.
Summary of the invention
Technical problem to be solved in the utility model provides the helical threaded fasteners of a kind of energy self-locking, fundamentally solves the problem that gets loose of fastening piece.
The technological scheme of the utility model technical solution problem is as follows:
A kind of self-locking helical threaded fasteners comprises the screw bolt and nut that is threaded mutually, is provided with female thread in the described nut, it is characterized in that, the tooth bottom of described female thread is provided with the wedge type inclined-plane, and the cusp of described bolt external screw thread is resisted against on the wedge type inclined-plane.
Described wedge type inclined-plane and nut center line are 30 degree angles.
The utility model adopts a kind of particular structure: the wedge shape inclined-plane that is provided with by the tooth bottom at female thread, when bolt and nut is tightened mutually, the cusp of bolt just withstands on the inclined-plane tightly, thereby produced very big coupling mechanism force, because the angle of thread form changes, make and be applied to that to contact the normal force that is produced between screw thread bigger than regular screw threads angle with the bolt axis angle, from but screw thread normal pressure of the present utility model is far longer than fastening pressure, therefore, the locking frictional force that is produced is also just inevitable have been increased greatly, has formed real auto-lock function.
By above disclosed technological scheme as can be known, the utility model compared with prior art has following advantage:
(1), adopt the utility model fastening piece not need as lock washer, screw thread viscose glue, inserted sheet and pin or packing etc., thereby to reach the purpose that reduces construction sequence, enhances productivity, reduces production costs with other auxiliary locking security measure.
(2), the utility model fastening piece can cooperate with the bolt of standard.And nut can reuse repeatedly, and can not reduce coupling mechanism force.
(3), the utility model fastening piece can be evenly distributed in load all teeth of internal thread and buckles, be used on the soft material especially, by load is evenly distributed, with the interlock mutually of whole bolt, and the pressurized active force again by radially direct, then screw can bear higher load and the unlikely phenomenon that causes the wearing and tearing screw thread effectively.
To sum up, the utility model fastening piece can be widely used in and comprise space flight, aviation, railway, automobile, medical treatment, furniture, engineering machinery and other various industrial machineries etc.
Description of drawings
Fig. 1 is the utility model structural representation;
Fig. 2 is a regular screw threads fastening piece free-body diagram;
Fig. 3 is the utility model threaded fastener free-body diagram;
Fig. 4 is the stressed carrying figure of regular screw threads and the utility model screw thread;
Fig. 5 is that three kinds of threaded fastener anti-vibrations can be tried hard to.
Embodiment
Further specify the utility model below in conjunction with accompanying drawing.
Referring to Fig. 1, the utility model self-locking helical threaded fasteners comprises the bolt 1 and the nut 2 that are threaded mutually, is provided with female thread 3 in the described nut 2, be provided with wedge type inclined-plane 4 at the bottom of the tooth of female thread 3, the cusp 5 of described bolt 1 external screw thread 7 is resisted against on the wedge type inclined-plane 4.
Described wedge type inclined-plane 4 is 30 degree angles with the nut center line.
Described wedge type inclined-plane tilts to the non-bearing face 6 of 4 female threads.
Compare with tradition 60 degree angle regular screw threads fastening piece free-body diagrams referring to Fig. 2 and Fig. 3 the utility model fastening piece: two represented power of arrow are Pa, the normal pressure P=1.15Pa of 60 traditional degree angle threaded fasteners, and the utility model fastening piece is owing to there is the wedge shape inclined-plane at one 30 degree angle at the bottom of the tooth, the angle of its normal pressure, size all changes, normal pressure P=2Pa.The utility model threaded fastener is compared with tradition 60 degree threaded fasteners like this, the normal pressure of the two 12: 7, and therefore locking frictional force has correspondingly increased.The utility model threaded fastener is because the structure uniqueness in addition, all the bolt cusp withstands on the 30 degree wedge shape inclined-planes tightly, as shown in Figure 4, the A curve is the stressed carrying figure of the utility model threaded fastener, the B curve is the stressed carrying figure of general energy threaded fastener, the utility model fastening piece is compared the ability of its anti-lateral movement with the regular screw threads fastening piece, the former is bigger three times than the latter; First of the utility model threaded fastener nut bears section and bears 17% load, and last supporting plane also bears 12.5% bearing load.Like this in the fastening piece proper functioning, screw thread is stressed evenly, every tooth, all evenly bears load weekly, does not exist stress to concentrate, and makes that to produce locking frictional force on the screw thread everywhere close, can effectively resist transverse vibration.Therefore, can not produce and get loose or sliding tooth problem, fatigue strength also obtains improvement at double, has eliminated the discontinuity that the regular screw threads fastening piece exists, the problem such as kill of threading off.
In laboratory experiment, made the transverse load vibration test with Junker formula vibration tester, by 3 kinds of nut tests, demonstrate the utility model fastener threads and have very excellent anti-vibration ability.As shown in Figure 5, the A curve is that the nut anti-vibration can be tried hard in the utility model fastening piece; The B curve is that common standard nut anti-vibration can be tried hard to; C curve is that the anti-vibration of effective torque locking nut can be tried hard to.With same standard bolt, same fastening loading moment, same amplitude-frequency and same laboratory, on same the testing machine, control two minutes test period.The result is: the common standard nut has almost all got loose immediately, has lost full product lock ability; The effective torque locking nut has lost 70% lock ability; And the utility model fastener nut has still kept their due self-lock ability at two minutes duration of test.
On the basis of above test, the reusability of three kinds of screw threads is done further transverse vibration test: the utility model Full Thread FT self-locking nut can be reused, through tightening repeatedly and unscrewing, still do not reduce its coupling mechanism force, the original locking effect of retention nut; And plain nut and effective torque locking nut be after tightening several times and unscrewing, and coupling mechanism force constantly reduces, and even completely loses lock ability.
Claims (3)
1. a self-locking helical threaded fasteners comprises the screw bolt and nut that is threaded mutually, is provided with female thread in the described nut, it is characterized in that, the tooth bottom of described female thread is provided with the wedge type inclined-plane, and the cusp of described bolt external screw thread is resisted against on the wedge type inclined-plane.
2. self-locking helical threaded fasteners according to claim 1 is characterized in that, described wedge type inclined-plane and nut center line are 30 degree angles.
3. self-locking helical threaded fasteners according to claim 1 is characterized in that, described wedge type inclined-plane is to the non-bearing face tilt of female thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520045825 CN2921415Y (en) | 2005-10-21 | 2005-10-21 | Self-locking helix screw-thread fastening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520045825 CN2921415Y (en) | 2005-10-21 | 2005-10-21 | Self-locking helix screw-thread fastening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2921415Y true CN2921415Y (en) | 2007-07-11 |
Family
ID=38253894
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520045825 Expired - Lifetime CN2921415Y (en) | 2005-10-21 | 2005-10-21 | Self-locking helix screw-thread fastening |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2921415Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893030A (en) * | 2009-05-21 | 2010-11-24 | 上海底特精密紧固件有限公司 | Fastening component and fastening assembly with improved internal thread following flank structure |
| CN109654102A (en) * | 2018-11-28 | 2019-04-19 | 浙江捷能汽车零部件有限公司 | With the external thread structure of the screw-internal thread fit of wedge-shaped checknut |
-
2005
- 2005-10-21 CN CN 200520045825 patent/CN2921415Y/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101893030A (en) * | 2009-05-21 | 2010-11-24 | 上海底特精密紧固件有限公司 | Fastening component and fastening assembly with improved internal thread following flank structure |
| CN101893027A (en) * | 2009-05-21 | 2010-11-24 | 上海底特精密紧固件有限公司 | Fastening member with internal threads and threaded fastening component |
| WO2010133116A1 (en) * | 2009-05-21 | 2010-11-25 | 上海底特精密紧固件有限公司 | Fastening component with female threads and thread fastening assembly |
| CN109654102A (en) * | 2018-11-28 | 2019-04-19 | 浙江捷能汽车零部件有限公司 | With the external thread structure of the screw-internal thread fit of wedge-shaped checknut |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI DITE PRECISION FASTENER CO., LTD. Free format text: FORMER NAME: SHANGHAI DETROIT PRECISION FASTENER CO., LTD. |
|
| CP03 | Change of name, title or address |
Address after: 201700 Shanghai Qingpu Jiuye Road No. 89 Patentee after: SHANGHAI DETROIT PRECISION FASTENER CO., LTD. Address before: 201812, No. four, 368, Po Garden Road, Shanghai, Jiading District Patentee before: Shanghai Detroit Precision Fastener Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20070711 |
|
| EXPY | Termination of patent right or utility model |