CN109751323A - A kind of self-locking thread pair - Google Patents
A kind of self-locking thread pair Download PDFInfo
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- CN109751323A CN109751323A CN201910084353.7A CN201910084353A CN109751323A CN 109751323 A CN109751323 A CN 109751323A CN 201910084353 A CN201910084353 A CN 201910084353A CN 109751323 A CN109751323 A CN 109751323A
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- screw thread
- thread pair
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- work package
- self
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- 238000005299 abrasion Methods 0.000 description 3
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- 238000006073 displacement reaction Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
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- BEIGFKLRGRRJJA-JLHYYAGUSA-O 2-(2f-benzothiazolyl)-5-styryl-3-(4f-phthalhydrazidyl)tetrazolium chloride Chemical compound C=1C=C2C(=O)NNC(=O)C2=CC=1[N+](N(N=1)C=2SC3=CC=CC=C3N=2)=NC=1\C=C\C1=CC=CC=C1 BEIGFKLRGRRJJA-JLHYYAGUSA-O 0.000 description 1
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- 230000008878 coupling Effects 0.000 description 1
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- 239000004519 grease Substances 0.000 description 1
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Abstract
The invention discloses a kind of self-locking thread pairs, including the first screw thread pair and the second screw thread pair, second screw thread pair is fixed on the side-friction for increasing by the first screw thread pair outside the first screw thread pair, increases external screw thread work package of the external screw thread as the second screw thread pair in the internal screw workpiece outer surface of the first screw thread pair.The present invention is threadedly coupled because of the temperature difference by double thread seondary effect effective solution, impact, screw thread pair rotation easily loosens under vibration and varying load effect, increase the validity of threaded connection, solves the dependence for being threadedly coupled intensity to work surface hardness, intensity, the requirement being threadedly coupled to connected piece intensity hardness is eliminated, and is threadedly coupled the dependence that there must be certain pretightning force.The defect of screw thread pair itself is not only solved in this way, and the field of screw thread pair utilization has also been enlarged, and is improved the safety of use.
Description
Technical field
The present invention relates to a kind of self-locking thread pairs, belong to screw thread pair technical field.
Background technique
Screw thread is divided into external screw thread and internal screw thread, they collectively constitute screw pair.Screw thread is divided into connection by job specification and uses
Screw thread and transmission screw thread.The equivalent friction angle of connection screw thread is larger, is advantageously implemented positive connection；Transmission screw thread is worked as
Amount angle of friction is smaller, is conducive to the efficiency for improving transmission.Screw thread is the key component of spiral marking connection and worm drive, now will be mechanical
In several common screw threads the characteristics of and application be described below:
1. triangle thread: thread form angle is big, and self-locking property is good, and root of the tooth is thick, intensity is high, therefore is chiefly used in coupling.
2. pipe screw thread: thread form angle α=55 ° (60 °), crest is arc-shaped, and is screwed between screw thread without radial clearance, compactness
Good, nominal diameter is the inside nominal diameter of pipe, is widely used in the pipe-line systems connection such as water, coal gas, hydraulic, lubrication.There is straight tube
With two kinds of Taper Pipe.Common pipe screw thread mainly includes following several: NPT, PT, G etc..1) NPT is National (American)
The abbreviation of Pipe Thread belongs to 60 degree of taper pipe threads of Unite States Standard, is used for north America region, and national standard consults GB/T12716-
1991.2) PT (BSPT) is the abbreviation of Pipe Thread, is 55 degree of sealing taper pipe threads, belongs to Whitworth thread family, is mostly used
In Europe and British commonwealth of nations, it is usually used in water and gas pipe industry, taper 1:16, national standard consults GB/T7306-2000.The country
Method is ZG..3) G is 55 degree of non-tight pipe screw threads, belongs to Whitworth thread family.Cylindrical thread is represented labeled as G.National standard consults GB/
T7307-2001。
3. rectangular thread: tooth form is square, thread form angle α=0 °, tooth thickness be screw pitch half, equlvalent coefficient of friction compared with
Small, efficiency is higher, but root of the tooth intensity is lower, after thread abrasion caused by axial gap be difficult to compensate for, accuracy of alignment is low, and finishing
Work is more difficult, therefore, the less use of this screw thread.
4. trapezoidal thread: tooth form is isosceles trapezoid, and thread form angle α=30 °, efficiency is lower than rectangular thread, but easy to process, right
Neutral good, root of the tooth intensity is higher, the gap generated by abrasion can also be eliminated when using subdivision nut, therefore be widely applied
In worm drive.
5. saw-tooth thread: the flank angle of saw-tooth thread working face is 3, and the flank angle of non-working surface is 30, has square concurrently
Shape screw efficiency height and the high advantage of trapezoidal thread root of the tooth intensity, but unidirectional load can only be born, suitable for the spiral shell unidirectionally carried
Rotation transmission.Thread intensity is high, the power transmission spiral for single load bearing；Such as fly press, jack.
Being threadedly coupled advantage is that structure is simple, is convenient to mount and dismount, with extensive.The disadvantage is that be easy failure and it is biggish in stress
Carried out when occasion and the larger temperature difference pre-tighten and it is locking.This disadvantage annoyings the development and utilization of screw thread pair always.And
Connector surface must have certain intensity and hardness when for being threadedly coupled, and required pretightning force, which is not so not achieved, can also cause
The failure of screw thread, which also limits the utilizations of threaded connection.The validity of whorl work piece depends on the workpiece screw thread accuracy of manufacture, spiral shell
The cooperation of line pair, enough pretightning forces, and the requirement to connector surface quality and intensity.These, which are integrated, makes to be threadedly coupled
Easily loosen all the time the hidden danger for not becoming equipment.It needs to expend a large amount of manual periodic inspection, pre-tightens.
Why can screw thread loosen failure?
When object is placed on an inclined-plane, it is worked as transverse direction by downward gravity and traversing horizontal force this two component
When component is greater than friction, object will be made to glide along inclined-plane.The screw thread pair of compression is also this reason: because screw thread is equidistant
Helix, so either segment screw thread is all oblique line, the pressure that bolt is subject to resolves into axial thrust load and transverse component, when compression
When screw thread pair is by certain vibration, when the transverse component of instantaneous time is greater than friction, it will will be threadedly coupled along inclined-plane slowly
Rotation, the time is long, and screw thread pair is just loose.When pretightning force is insufficient or failure equally can also make transverse component be greater than friction, just
Screw thread can slowly be rotated along inclined-plane.
Summary of the invention
Goal of the invention: to solve a problem that screw thread pair in the prior art is easy to produce insufficient pretightning force or failure, this
A kind of self-locking thread pair of disclosure of the invention, apply to it is all installed for screw thread pairs, lock, seal, connection, positioning and operating
Mechanical combination.
Technical solution: a kind of self-locking thread pair of the invention, including the first screw thread pair and the second screw thread pair, second spiral shell
Line pair is fixed on the side-friction for increasing by the first screw thread pair outside the first screw thread pair.
Preferably, increase external screw thread of the external screw thread as the second screw thread pair in the internal screw workpiece outer surface of the first screw thread pair
Work package.
Preferably, the external screw thread work package of second screw thread pair is with tapered configuration, the internal screw thread of the second screw thread pair
Work package is the structure with the external screw thread work package taper fit of the second screw thread pair.
Preferably, in the common section of external screw thread work package of the internal screw thread work package and the second screw thread pair of first screw thread pair
On offer it is several equity connection fluting.
Preferably, the taper of the external screw thread work package of second screw thread pair meets the second screw thread pair not to before range
Reaching required torque makes the first screw thread pair tailing screw flight pair complete to be bonded and reaches required pressure.
Preferably, the internal screw thread of the thread angle of the external screw thread work package of second screw thread pair and the second screw thread pair works
It differs at the thread angle of part.
Preferably, the internal screw thread of the tooth root tooth and tooth height and the second screw thread pair of the external screw thread work package of second screw thread pair
The a height of not reciprocity shape of the tooth root tooth and tooth of work package.
The utility model has the advantages that compared with prior art, the present invention having the advantage that
1, the present invention is threadedly coupled the impact because of the temperature difference, vibration and variable load by double thread seondary effect effective solution
Lotus acts on lower screw thread pair rotation and easily loosens.
2, invention increases the validity of threaded connection, safety, solve be threadedly coupled intensity to work surface hardness,
The requirement being threadedly coupled to connected piece intensity hardness is eliminated in the dependence of intensity, and threaded connection must have certain pretightning force
It relies on.
3, because the second screw thread pair makes the first screw thread pair of the pressure increase of fitting and generation between the first screw thread pair
Rigidity of the external screw thread work package in conjunction with the internal screw thread work package of the first screw thread pair reduces external complex operating condition to the first screw thread
A possibility that relative displacement occurs for the first screw thread pair is effectively reduced and avoids in secondary influence.Due to screw thread pair growth and
The connection rigid phase of the internal screw thread work package of the external screw thread work package and the first screw thread pair of the first screw thread pair connected by screw thread pair
To objects such as the sealings enhanced inside the connectors such as the significantly more efficient connector for avoiding threaded connection because Joint rigidity is insufficient
Or cause under external force between screw thread there are gap and shake the failure for generating abrasion and alternation extruding, effectively protect first
The elements such as the sealing inside screw thread pair.
4, for the object for needing to be positioned with screw thread rotation can also self-locking thread pair through the invention, eliminate between screw thread
Precision problem caused by gap improves the precision and stability of rotational positioning.
5, it because the second screw thread pair makes the fitting between the first screw thread pair, reduces and is threadedly coupled effective property to screw element system
The dependence of manufacturing accuracy and cooperation substantially increases the safety and effectiveness of threaded connection.
Detailed description of the invention
Fig. 1 is the structural diagram of the present invention；Wherein, 1 be the first screw thread pair external screw thread work package, 2 be the first screw thread
Secondary internal screw thread work package, 3 be the external screw thread work package of the second screw thread pair, and 4 be the internal screw thread work package of the second screw thread pair；
Fig. 2 is the external screw thread work package of the second screw thread pair of the invention and being bonded for the internal screw thread work package of the second screw thread pair
Schematic diagram；
Fig. 3 is fluting schematic diagram of the invention.
Specific embodiment
The inventive method is further described with reference to the accompanying drawing.
The present invention uses inside and outside double thread pair, and the lateral frictional force that external screw thread pair increases internal screw thread pair effectively solves internal screw thread
Pair is in the temperature difference, impact, screw thread pair rotation easy the problem of loosening under vibration and varying load effect.The present invention can not need pretightning force
Just screw thread pair can be made self-locking, be not subjected to displacement.Reduce and be threadedly coupled requirement to pretightning force, expand be threaded in it is soft
Operation strategies on metal and low-intensity object, expand threaded connection uses field.Spiral shell can be effectively controlled by taper
The failure that foozle between line pair causes, reduces the requirement to the accuracy of manufacture of screw thread, greatly promotes in pipeline connection
The stability and leakproofness of connector.The present invention can also be in the positioning of various spiral liftings with to eliminate thread pitch bring
Error improves the precision of reciprocating motion, eliminates the screw thread pair screw thread pair Relative Vibration that stress causes repeatedly and displacement, it is fixed to increase
Stability behind position.
Structure of the invention is specifically detailed in Fig. 1, including the first screw thread pair and the second screw thread pair, and second screw thread pair is fixed
Increase the side-friction of the first screw thread pair outside the first screw thread pair.First screw thread pair meets spiral shell as the screw thread pair worked normally
The needs of line connection, including the first screw thread pair external screw thread work package 1 and the first screw thread pair internal screw thread work package 2, the second screw thread pair
As locking screw pair, for pasted between the first screw thread pair it is dead and generate certain normal pressure play between the first screw thread pair from
Lock effect, including the second screw thread pair external screw thread work package 3 and the second screw thread pair internal screw thread work package 4.In the first screw thread pair
2 outer surface of whorl work piece increases external screw thread as the second screw thread pair external screw thread work package 3.
As shown in Fig. 2, the second screw thread pair external screw thread work package 3 of the invention is with tapered configuration, in the second screw thread pair
Screw thread work package 4 is the structure with 3 taper fit of the second screw thread pair external screw thread work package, the second screw thread pair external screw thread work package 3
Taper meet the second screw thread pair and so that the tailing screw flight in the first screw thread pair is completed patch to reaching required torque before range
Merging reaches required pressure.
As shown in figure 3, several flutings are offered in the second screw thread pair external screw thread work package 3, due in the first screw thread pair
Screw thread work package 2 is structure as a whole with the second screw thread pair external screw thread work package 3, therefore slots from the first screw thread pair internal screw thread work package
2 flank is through to the flank of the second screw thread pair external screw thread work package 3.
The thread angle of second screw thread pair external screw thread work package 3 of the invention and the second screw thread pair internal screw thread work package 4
Thread angle is differed, a height of not reciprocity shape of tooth root tooth and tooth of the second screw thread pair internal screw thread work package 4.
Embodiment:
First screw thread pair of the present embodiment is completed existing threaded items in normal work and is acted on, outside first screw thread pair
Manufactured size, precision, tolerance, strength grade and the existing threaded connection of screw thread work package 1 require equivalent, spiral shell in the first screw thread pair
The production of line work package 2 cooperates the first screw thread pair external screw thread work package 1, size, precision, tolerance, strength grade and existing spiral shell
Line connection request is equal to length and doubles, and the increased portion of external of 2 length of the first screw thread pair internal screw thread work package increases
Tapered external screw thread simultaneously opens up several flutings according to taper and diameter, and the first screw thread pair internal screw thread work package 2 is facilitated to exist
Contraction when receiving extruding functions similarly to the effect of open-type elastic cylindrical pin, is adjacent to the first screw thread pair in tail portion and extremely disappears
Increase radial pressure except thread pitch and between the first screw thread pair, increases the frictional force between the first screw thread pair.
Work package 4 connects work, the second screw thread pair internal screw thread in second screw thread pair external screw thread work package 3 and the second screw thread pair
Work package 4 is rotated along the second screw thread pair external screw thread work package 3 along conical surface uplink, and continuous uplink, which constantly squeezes, to be made in the first screw thread pair
Screw thread work package 2, which is constantly shunk, is adjacent to the first screw thread pair external screw thread work package 1, is continuously increased the first screw thread pair internal screw thread work package
2 and the first pressure before screw thread pair external screw thread work package 1, until required pressure initiation.
Material capability of the second screw thread pair external screw thread work package 3 according to the first screw thread pair makes maximum allowance, required
Strength grade determines taper, meets the second screw thread pair not to reaching screw thread between required the first screw thread pair of torque tail portion before range
It is bonded completely and reaches required pressure.Quantity of slotting is determined according to required pressure and material and diameter.Meet it is above-mentioned before
It puts, necessary grease is increased according to working condition requirement between screw thread pair or powder lubricates, the second screw thread pair is eliminated with this
Frictional force, and eliminate or reduce because of friction bring additional drag and the thermally-induced second screw thread pair internal screw thread work that rubs whereby
4 thermal deformation of part leads to the Strength Failure of the second screw thread pair internal screw thread work package 4.Pass through the method with the thread angle that do not wait simultaneously
Control friction between the second screw thread pair and anti-loosening, by the dedendum angle of internal and external threads at this and tooth it is high be made into as needed it is not reciprocity
Shape reduces the frictional force between the second screw thread pair with this, increases pressing force, be detailed in Fig. 2.
Claims (7)
1. self-locking thread pair, it is characterised in that: including the first screw thread pair and the second screw thread pair, second screw thread pair is fixed on
Increase the side-friction of the first screw thread pair outside one screw thread pair.
2. self-locking thread pair according to claim 1, it is characterised in that: in the internal screw workpiece outer surface of the first screw thread pair
Increase external screw thread workpiece of the external screw thread as the second screw thread pair.
3. self-locking thread pair according to claim 2, it is characterised in that: the external screw thread work package of second screw thread pair is
With tapered configuration, the internal screw thread work package of the second screw thread pair is the knot with the external screw thread work package taper fit of the second screw thread pair
Structure.
4. self-locking thread pair according to claim 3, it is characterised in that: in the internal screw thread work package of first screw thread pair
Fluting is connected to several equities are offered in the common section of external screw thread work package of the second screw thread pair.
5. self-locking thread pair according to claim 3, it is characterised in that: the external screw thread work package of second screw thread pair
Taper, which meets the second screw thread pair, does not make the first screw thread pair tailing screw flight pair complete fitting simultaneously to reaching required torque before range
Reach required pressure.
6. self-locking thread pair according to claim 3, it is characterised in that: the external screw thread work package of second screw thread pair
It differs at the thread angle of the internal screw thread work package of thread angle and the second screw thread pair.
7. self-locking thread pair according to claim 3, it is characterised in that: the external screw thread work package of second screw thread pair
The a height of not reciprocity shape of the tooth root tooth and tooth of the internal screw thread work package of tooth root tooth and tooth height and the second screw thread pair.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910084353.7A CN109751323A (en) | 2019-01-29 | 2019-01-29 | A kind of self-locking thread pair |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910084353.7A CN109751323A (en) | 2019-01-29 | 2019-01-29 | A kind of self-locking thread pair |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109751323A true CN109751323A (en) | 2019-05-14 |
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ID=66406627
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910084353.7A Pending CN109751323A (en) | 2019-01-29 | 2019-01-29 | A kind of self-locking thread pair |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1047332A (en) * | 1996-08-08 | 1998-02-17 | Isel Kk | Locking nut mechanism |
| JP2016133217A (en) * | 2015-01-15 | 2016-07-25 | 良三 太田 | Lock structure of nut fastened to bolt |
| CN105927650A (en) * | 2016-06-29 | 2016-09-07 | 王辉 | Tuning self-locking screw rod for radio frequency device and manufacture method thereof |
| CN107237806A (en) * | 2017-08-04 | 2017-10-10 | 华和平 | Nut retaining locking device |
| CN107740807A (en) * | 2017-11-29 | 2018-02-27 | 忻建国 | A kind of combination stop nut locked using tapered thread |
| CN207795812U (en) * | 2017-11-29 | 2018-08-31 | 忻建国 | A kind of combination stop nut and coupling structure using tapered thread locking |
| CN210106381U (en) * | 2019-01-29 | 2020-02-21 | 武筱茜 | Self-locking thread pair |
-
2019
- 2019-01-29 CN CN201910084353.7A patent/CN109751323A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1047332A (en) * | 1996-08-08 | 1998-02-17 | Isel Kk | Locking nut mechanism |
| JP2016133217A (en) * | 2015-01-15 | 2016-07-25 | 良三 太田 | Lock structure of nut fastened to bolt |
| CN105927650A (en) * | 2016-06-29 | 2016-09-07 | 王辉 | Tuning self-locking screw rod for radio frequency device and manufacture method thereof |
| CN107237806A (en) * | 2017-08-04 | 2017-10-10 | 华和平 | Nut retaining locking device |
| CN107740807A (en) * | 2017-11-29 | 2018-02-27 | 忻建国 | A kind of combination stop nut locked using tapered thread |
| CN207795812U (en) * | 2017-11-29 | 2018-08-31 | 忻建国 | A kind of combination stop nut and coupling structure using tapered thread locking |
| CN210106381U (en) * | 2019-01-29 | 2020-02-21 | 武筱茜 | Self-locking thread pair |
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