CN206234237U - Pitch interference fit screw thread, threaded connector and amendment screwing tool - Google Patents
Pitch interference fit screw thread, threaded connector and amendment screwing tool Download PDFInfo
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- CN206234237U CN206234237U CN201621333273.9U CN201621333273U CN206234237U CN 206234237 U CN206234237 U CN 206234237U CN 201621333273 U CN201621333273 U CN 201621333273U CN 206234237 U CN206234237 U CN 206234237U
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Abstract
The utility model provides a kind of pitch interference fit screw thread, threaded connector and amendment screwing tool, belong to MACHINERY JOINT field, including the external screw thread and internal thread that cooperate, change external screw thread or internal thread original triangle parameter cause the external screw thread for cooperating and internal thread with pitch difference, externally threaded pitch is the 95%-99% of the pitch of internal thread；Or the 95%-99% that the pitch of internal thread is externally threaded pitch.Pitch interference fit screw thread makes to be threaded in screwing length scope internal load and is evenly distributed, and improves the bonding strength of screw thread；Pitch interference fit screw thread makes the locking torque of the stabilization needed for being obtained in the case of without axial load between internal and external threads, effectively solves the problems, such as threaded connector self-locking；The anti-loosening locking torque that pitch interference fit screw thread is formed does not increase the additional torque that screw thread is tightened.
Description
Technical field
The utility model is related to MACHINERY JOINT field, in particular to a kind of pitch interference fit screw thread, screw thread
Connector and amendment screwing tool.
Background technology
Threaded connection is that, in the world using connected mode the most universal, screw thread is that the most familiar of mechanical structure of people will
Element, either space flight, aviation, atomic energy, industrial machine, electronic product, communications and transportation, textile machine and daily necessities do not have
Which can leave threaded connection.But annoying numerous mechanics in the presence of two big technical barriers in the technical field of threaded connection
Cheng expert, one is threaded connection intensity, is mainly reflected in screw at work due to being acted on by alternate load, is generally being leaned on
The problem being broken at nearly internal thread supporting surface；Another is the lock between the internal and external threads part for working under vibrating conditions
Tight problem.
Utility model content
The purpose of this utility model is to provide a kind of pitch interference fit screw thread, to improve the threaded connection of prior art
Mode bonding strength is low and problem of poor in self under vibrating conditions.
The purpose of this utility model is to provide a kind of threaded connector, is connected with the thread connecting mode for improving prior art
Connect low intensity and the under vibrating conditions problem of poor in self.
The purpose of this utility model is to provide a kind of amendment screwing tool, to improve the threaded connection of prior art
Mode bonding strength is low and problem of poor in self under vibrating conditions.
What embodiment of the present utility model was realized in：
Based on above-mentioned first purpose, the utility model provides a kind of pitch interference fit screw thread, it is characterised in that including
The external screw thread and internal thread of mutual cooperation, the original triangle parameter for changing the external screw thread or the internal thread make
The external screw thread that must cooperate and the internal thread with pitch difference, wherein, the externally threaded pitch is described
The 95%-99% of the pitch of internal thread；Or the 95%-99% that the pitch of the internal thread is the externally threaded pitch.
In the utility model preferred embodiment, the internal thread is metric system standard thread, the externally threaded pitch
Correction be 0.01-0.05, wherein, the correction is the difference of the externally threaded pitch and the pitch of the internal thread
Absolute value and the pitch of the internal thread ratio.
In the utility model preferred embodiment, the external screw thread is metric system standard thread, the pitch of the internal thread
Correction be 0.01-0.05, wherein, the correction is the difference of the externally threaded pitch and the pitch of the internal thread
Absolute value and the externally threaded pitch ratio.
In the utility model preferred embodiment, the internal thread is British standard thread, the externally threaded pitch
Correction be 0.01-0.05, wherein, the correction is the difference of the externally threaded pitch and the pitch of the internal thread
Absolute value and the pitch of the internal thread ratio.
In the utility model preferred embodiment, the external screw thread is British standard thread, the pitch of the internal thread
Correction be 0.01-0.05, wherein, the correction is the difference of the externally threaded pitch and the pitch of the internal thread
Absolute value and the pitch of the internal thread ratio.
In the utility model preferred embodiment, the thread form angle of the external screw thread or the internal thread is 60 degree.
Based on above-mentioned second purpose, the utility model provides a kind of threaded connector, including the external screw thread for cooperating
And internal thread, the original triangle parameter for changing the external screw thread or the internal thread causes the described of mutual cooperation
The pitch of external screw thread and the internal thread, the externally threaded pitch is the 95%- of the pitch of the internal thread
99%；Or the 95%-99% that the pitch of the internal thread is the externally threaded pitch.
Based on above-mentioned 3rd purpose, the utility model provides a kind of amendment screwing tool, including amendment internal thread
Forming part, the pitch in the amendment forming internal threads portion is 0.95P-0.99P, wherein, P is to match with the amendment internal thread
The externally threaded standard pitch closed.
In the utility model preferred embodiment, also including amendment external screw thread forming part, the amendment external screw thread shaping
The pitch in portion is 0.95P-0.99P, wherein, P is the standard pitch of the internal thread being engaged with the amendment external screw thread.
In the utility model preferred embodiment, the amendment screwing tool can be screw tap, cylindrical die roll, thread rolling
One kind in plate and screw die.
The beneficial effect of the utility model embodiment is：
In sum, the utility model embodiment provides a kind of pitch interference fit screw thread, by common threaded connection
The tooth form of a screw thread in the internal and external screw thread of middle mutual cooperation is modified, and obtaining one group has the new of axial interference fit
Screw thread matching relationship, this screw thread is by the adjustment to screw thread original triangle, in the internal and external threads of change mutual cooperation
One pitch dimension of screw thread, makes screw thread produce axial interference by pitch difference in the range of screwing length.Here internal and external threads
The different screw threads for cooperating of pitch are referred to as pitch interference fit screw thread, and spiral shell is claimed to the screw thread that pitch dimension have adjusted therein
Away from amendment screw thread.In pitch interference fit screw thread, if wherein external screw thread is standard thread, the internal thread being engaged must be spiral shell
Away from increase or the pitch amendment screw thread for reducing；If wherein internal thread is standard thread, the external screw thread being engaged must be pitch
Increase or the pitch amendment screw thread for reducing.The thread form angle of pitch amendment screw thread is identical with the thread form angle of standard thread, only to pitch
Micro adjustment is done, general adjustment amount is one to percent five the percent of pitch dimension.Pitch interference fit screw thread connects screw thread
Fitting shows new great good characteristic：
A, pitch interference fit screw thread make to be threaded in screwing length scope internal load and are evenly distributed, and improve screw thread
Bonding strength；
B, pitch interference fit screw thread make to be obtained in the case of no axial load between internal and external threads needed for it is steady
Fixed locking torque, effectively solves the problems, such as threaded connector self-locking；
The anti-loosening locking torque that C, pitch interference fit screw thread are formed does not increase the additional torque that screw thread is tightened.
Pitch interference fit screw thread under conditions of screwing length is certain, by adjust cooperate internal thread and outer spiral shell
The method of the difference between line pitch reaches optimum performance requirement.Wherein, screwing length refers to two screw thread edges of mutual cooperation
Axis of thread direction mutually screws the length of part.
The threaded connector that the present embodiment is provided, all advantages with above-mentioned pitch interference fit screw thread.
The amendment screwing tool that the present embodiment is provided, the internal thread and external screw thread of the mutual cooperation that processing is obtained have
All advantages of the above-mentioned interference fit screw thread that is spirally connected.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme of the utility model embodiment, below will be to be used needed for embodiment
Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should not be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, may be used also
Other related accompanying drawings are obtained with according to these accompanying drawings.
Fig. 1 is the schematic diagram of the pitch interference fit screw thread of the utility model embodiment；
Fig. 2 is the schematic diagram of threaded fastener use state；
Fig. 3 is the structural representation of the pitch interference fit screw thread of the utility model embodiment.
Icon：Internal thread 100；External screw thread 200.
Specific embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Accompanying drawing in type embodiment, is clearly and completely described, it is clear that retouched to the technical scheme in the utility model embodiment
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally described in accompanying drawing herein and
The component of the utility model embodiment for showing can be arranged and designed with a variety of configurations.
Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit requirement
The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of creative work is not made, all
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then it need not be further defined and explained in subsequent accompanying drawing.
, it is necessary to the orientation or position relationship of the instruction such as explanation, term " outward " are base in description of the present utility model
In orientation shown in the drawings or position relationship, or the orientation usually put when using of the utility model product or position are closed
System, is for only for ease of description the utility model and simplifies description, necessary rather than the device or element for indicating or imply meaning
With specific orientation, with specific azimuth configuration and operation, therefore it is not intended that to limitation of the present utility model.
In description of the present utility model, in addition it is also necessary to explanation, unless otherwise clearly defined and limited, term " sets
Put ", " installation ", " connected ", " connection " should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected,
Or be integrally connected；Can mechanically connect, or electrically connect；Can be joined directly together, it is also possible to by intermediary
It is indirectly connected to, can is two connections of element internal.For the ordinary skill in the art, can be managed with concrete condition
Solve concrete meaning of the above-mentioned term in the utility model.
It should be noted that in the case where not conflicting, the feature in embodiment and embodiment in the utility model can
To be mutually combined.
Pitch interference fit screw thread embodiment
The metric system standard thread being related in the present embodiment is with reference to GB00196-2003 regular screw threads standards.Refer to Fig. 1
And showing that internal thread 100 is the screw thread for increasing pitch in Fig. 3, Fig. 3, external screw thread 200 is the schematic diagram of standard thread, its
In, H is the height of externally threaded original triangle, and H1 is the height of the original triangle of internal thread；P is externally threaded pitch, and P1 is
The pitch of internal thread；D1 is diameter of thread, and d2 is the pitch diameter of thread, and d is Major Diam；M is maximum axial interference.The utility model
A kind of pitch interference thread structure, including the external screw thread 200 and internal thread 100 for cooperating, the externally threaded spiral shell are provided
Line tooth form is triangle, and the form of thread of the internal thread is triangle；The externally threaded thread form angle and the internal thread
Thread form angle is equal；The externally threaded original triangle is equilateral triangle, and the original triangle of the internal thread is equilateral three
It is angular, and the length of side of the original triangle of the internal thread is unequal with the length of side of the externally threaded original triangle；
The externally threaded pitch is the 95%-99% of the pitch of the internal thread；Or the pitch of the internal thread is
The 95%-99% of the externally threaded pitch.
Each portion's size of basic parameter and screw thread of form of thread is determined by the original triangle of form of thread, commonly
The original triangle of screw thread is the equilateral triangle that the length of side is equal to pitch.Pitch interference thread is the inside and outside spiral shell that a pair of matched is closed
The length of side of a form of thread original triangle in line is corrected (increase is reduced), and another holding is constant, so that it may
To obtain required axial interference in the range of the screwing length of screw thread.It is inside and outside in order to meet after the pitch of internal and external threads changes
Screw thread can be used cooperatively, and the knots modification of the pitch of internal and external threads needs within the specific limits, therefore, the two of setting mutual cooperation
The pitch of individual screw thread is respectively P1 and P2, then the relation of P1 and P2 is：P1=(0.95-0.99) P2, the pitch of internal thread 100
The pitch of external screw thread 200 can be more than, the pitch of internal thread 100 can be less than the pitch of external screw thread 200, as long as meeting above-mentioned
Pitch relation.
The utility model embodiment proposes the new ideas of screw thread axial direction interference fit, by micro adjustment internal thread 100
Or the pitch of external screw thread 200 so that the pitch of two internal threads 100 for cooperating and external screw thread 200, by inside and outside
The pitch official post screw thread of screw thread produces axial interference in the range of screwing length, and this pitch difference produces axial interference fit
Screw thread is exactly pitch interference fit screw thread, and pitch amendment screw thread is claimed the screw thread formed after fine setting pitch.
At present, vast mechanical engineering expert, one are annoying in the presence of two big technical barriers in the technical field of threaded connection
It is threaded connection intensity, is mainly reflected in screw at work due to being acted on by alternate load, generally near internal thread branch
The problem that support face place is broken.Another is the locking problem between the internal and external threads part for working under vibrating conditions.
A. on threaded connection intensity to topic：
Fig. 2 is referred to, in mechanical structure, each parts majority is that they are fixed together by threaded fastener
, each threaded fastener will finally be loaded by the internal and external threads for cooperating, and bear whole load.Thread part is turned round
After tight, load is interacted by internal and external threads, is clamped correlated parts through the support end face of inner thread part, although inside and outside
There are multiple threads in the range of the screwing length of screw thread, but the transmission of power is hindered due to the rigidity of material, in length of thread engagement
Screw thread stress it is very uneven.Under Axial Loads, first ridge near inner thread part supporting surface is received first
The power of remainder could be passed to second thread by power, axial force after making first ridge deformation, by that analogy.Away from
The load that screw thread is received at internal thread support end is less and less, if screwing length is long, away from the last several of internal thread support end
Individual ridge no longer stress.70% load all concentrates on first at internal thread support end in general threaded connection
On the second two ridges.
The inhomogeneities that screw thread is distributed in screwing length scope internal load, the intensity that serious influence is threadedly coupled, this is just
It is generally occur the reason for being buckled at screw thread near internal thread support end the one the second in the fracture of screw in mechanical structure, is generation
Unsolved one big technical barrier for a long time in boundary.
B. problem is locked on thread part：
Screw thread receives responsive to axial force in the case of usual static load, and the frictional force produced between internal and external threads tooth surface is more than axle
To the tangential component that power is produced in lead angle direction, that is to say, that regular screw threads (including coarse thread, fine thread) are in static load feelings
Frictional force under condition between screw thread can play self-locking action, and this is the auto-lock function of screw thread itself.In the quiescent state, turned round
All there is very big friction between the surface of internal and external threads and correlated parts due to the effect of axial load in tight threaded connector
Power, wanting the screw for having tightened to unclamp must could be twisted with the torque being close when tightening.But carry under vibrating conditions
Lotus is to change, and moment axial load may be close to zero, the frictional force between screw thread and correlated parts with Minus it is small or disappear, shake
The dynamic inertia force moment produced to part, screw connection structure will loosen more than the frictional force between screw thread and correlated parts,
Once generation thread looseness, the fastening effect of screw thread just fails rapidly and mechanical breakdown occurs.To solve threaded connector locking
Problem, domestic and international expert did many effort, on connecting-piece structure with increase spring pad, Corrugation pad, dentiform gasket, split pin,
Locking silk etc., there is various self-locking nuts, such as nylon ring self-locking, fluting self-locking, closing in self-locking, filler self-locking on design of part
Deng, also change helicitic texture, but effect is all undesirable.The failure of not only complex structure high cost, and unstable properties is fast.
The self-locking problem of screw thread is another technical barrier in threaded connection.
The two big world property technologies that the pitch interference fit screw thread that the present embodiment is provided effectively solves threaded connection are difficult
Topic：
A, pitch interference fit screw thread can make length of thread engagement scope internal load be evenly distributed, and improve threaded connection strong
Degree, solves the problems, such as that screw thread is being broken at internal thread supporting surface：
With the threaded connection of pitch interference fit, when internal and external threads are also without whole Xuan He Time, due to screwing few, spiral shell of detaining number
The fit clearance of the internal and external threads caused by factors such as the manufacturing tolerances of screw thread is not yet all compensated away from difference, internal and external threads can be light
Screwing for pine, screws during to certain length, after whole Screw Thread Fit Clearances are fallen in the pitch difference compensation existed between internal and external threads,
The two sides for screwing the two ends ridge of part start contact, continue to screw in, and interference is produced between the ridge for having contacted, and force
Ridge elastic bending deflection, consequently also following contacts, so that producing interference, after screw thread is all screwed, are revolving close ridge
The ridge interference for closing the two ends of length is maximum, small to middle Zhu Jian Minus, due to there is Screw Thread Fit Clearance, in the middle of screwing length
Part ridge be mutually not in contact with each other.Pitch interference fit screw thread when there is no axial load, the pitch official post spiral shell of internal and external threads
Internal and external threads of the line at screwing length two ends produce interference, form two pairs of active forces for mutually extruding.If the pitch of internal thread
More than externally threaded pitch, in the two ends external screw thread Tensile of screwing length, internal thread is compressed, the internal and external threads of center section
There is fit clearance not stressing.When continuing to tighten screw thread, axial tension is produced to deform correlated parts, near internal thread support
Face end, the active force produced by pitch difference is offset by rightabout pulling force, and pitch difference is all offset with the increasing of axial tension
After the active force of generation, near internal thread support end, the screw thread diastema that internal and external threads have gap one side is eliminated, and starts
Axial force is contacted and born, is increased with the increase of lashing force, the ridge at the middle part of screwing length is also mutually inherited
By responsive to axial force.Away from internal thread supporting surface end, the active force that pitch difference is produced exists, while because of ridge elasticity
The equidirectional axial force that displacement transfer comes increases it.Because the active force that pitch interference is produced is reduced near internal thread branch
The stress of end ridge is supportted, the stress away from internal thread support end ridge is increased, ridge in the range of screwing length is received
Power is uniform.Pitch interference fit screw thread changes the stress of screw thread each ridge in the range of screwing length, in screw thread rotation
Length internal thread uniform force is closed, the intensity of threaded connector is greatly improved, solve screw near internal thread branch
The skill wood problem of support face end fracture.
B, pitch interference fit screw thread are preferable locking screws, and structure is most simple, and cost is minimum, stable and reliable for performance：
After the internal and external threads of pitch interference fit screw thread are all screwed, the pitch official post screwing length two ends of internal and external threads
The axial interference between axial interference, internal and external threads is produced between multiple ridges to be made to produce between these ridge side helical surfaces to rub
Power is wiped, these frictional force just constitute the locking torque of pitch interference fit screw thread.
The locking torque of pitch interference fit screw thread depends on the size of pitch difference, the maximum and screwing length of pitch difference
The interior number of threads is relevant, and the maximum axial magnitude of interference is in screwing length：
Σ Δs Ρ=Δ Ρ χ Ν
Σ Δs Ρ --- total axial magnitude of interference, i.e. Lei Plot pitch differences in the range of screwing length；
Δ Ρ --- single pitch difference；
Ν --- the number of threads in the range of screwing length；
Because the processing of internal and external threads all has an error, and pitch error in itself and Half angle errors will the pitch diameters of thread
Certain fit clearance is certainly existed to compensate, between internal and external threads, given pitch difference will first compensate the fit clearance of screw thread
After interference could be formed between ridge, therefore, have gap between the middle part of screwing length, screw thread, gradually disappear to two side clearances
Except interference is formed, at screwing length two ends, interference is maximum, therefore, the frictional force of locking is primarily generated at the two ends of screwing length.
When the internal and external threads of pitch interference fit are mutually torqued into, between starting because pitch difference is insufficient to compensate for screw thread cooperation
Gap, can easily be screwed into most (about 2/3rds), then produce interference it need to be completely torqued into and be screwed with wrench.
The locking torque of pitch interference fit screw thread is that interference of the internal and external threads pitch difference at screwing length two ends is produced,
As long as the pitch of a screw thread in internal thread or external screw thread is increased or reduced can obtain required coupling mechanism force, general feelings
Realized using the method for increasing internal thread pitch under condition.Because internal thread is all processed with screw tap, as long as changing screw tap
Pitch just can be with.The pitch of screw-tap threaded can be adjusted by the precision of micron, and the adjustment to locking torque is also just very accurate,
Implement very convenient simple.
The locking torque of pitch interference fit screw thread not only stability and durability, does not increase the additional force that thread part is tightened also
Square, because the locking torque that thread part tightens the generation of pitch interference to a certain extent disappears, only tightens between internal and external threads
Axle power and to reach the torsion that the axle power is applied, this is that other locking mechanisms cannot be accomplished.Pitch interference fit screw thread
It is structure most simple, the most reliable locking mode of performance.
In the present embodiment, the design principle of pitch interference fit screw thread is as follows：
Fig. 3 is referred to, each portion's size of basic parameter and screw thread of form of thread is true by the theoretical triangle of form of thread
Fixed, form of thread theory triangle is the equilateral triangle that the length of side is equal to pitch.For in determination pitch interference fit screw thread
The dimensional parameters of pitch amendment screw thread, make one group of theoretical triangle of standard thread, the pitch that have selected pitch dimension first
The lower summit on the lower summit and standard thread theory triangle of correcting the theoretical triangle of screw thread is placed on same straight line, and will
Under the lower summit of a triangle in the theoretical triangle of pitch amendment screw thread and one of standard thread theoretical triangle
Summit overlaps, then by remaining theoretical triangle of pitch interference thread and standard thread successively to arranged on both sides, the institute of pie graph 3
Relation between the internal and external threads theory triangle of the pitch interference fit shown.
It by internal thread is pitch amendment screw thread that Fig. 3 is, external screw thread is standard thread, and internal thread pitch is more than external screw thread spiral shell
Relational design away from (Δ P=P2P1).The two that the lower summit of this two groups of threading theoretical triangle intermediate cam shapes is overlapped
Theoretical triangle claims " benchmark triangle ", and the straight line residing for summit under all theory triangles is claimed " datum line ".Determine by Fig. 3
The theoretical triangle of pitch amendment screw thread can just design each nominal diametrical dimension for calculating pitch interference thread.
Δ P in Fig. 3 is the pitch correction of pitch interference thread, and P is the pitch of standard thread；Typically take Δ P=
(0.01~0.05) P, due to △ P very littles, the influence of the H/4 of pair determination diameter of thread and the H/8 of determination Major Diam is negligible
Disregard, the desirable path and the nominal dimension phase in big footpath with standard thread of the path of pitch amendment screw thread and the nominal dimension in big footpath
Together.
Pitch amendment pitch diameter of thread size should be relevant with pitch, due to setting of taking that summit under theoretical triangle overlaps
Meter principle, during measurement pitch amendment screw thread, using three pins with standard thread same diameter, aborning can be pitch amendment
The central diameter size equivalent processes of pitch diameter of thread size and standard thread because this central diameter be not pitch amendment screw thread it is true in
Footpath, " the equivalent central diameter " of pitch amendment screw thread is claimed the pitch amendment screw thread central diameter corresponding with standard thread.
The Δ P of the size of pitch interference fit thread locking torque and pitch amendment screw thread, D2, screwing length and it is engaged
Standard thread in it is relevant through size, reasonable selection above-mentioned parameter can just obtain preferable performance.
The species of form of thread has various, for example：Triangle thread, trapezoidal thread, rectangular thread, circular thread.In reality
When border is applied, in the preferred scheme of the present embodiment, the form of thread of the internal thread 100 is triangle, corresponding, described outer
The form of thread of screw thread 200 is triangle, and triangle thread has a wide range of application, and is mainly used in the connection between part, in triangle
Shape needs the requirement of self-locking higher when being threadedly coupled, therefore, by the form of thread of the internal and external threads of the pitch interference thread
Triangle is processed as, the self-locking performance of triangle thread connection can be substantially improved, further lifted it and use space.External screw thread or
The thread form angle of person's internal thread is effectively set to 60 degree, it is clear that may not be 60 degree.
During reality processing, in order to meet the pitch of internal and external screw thread in a suitable difference range, by changing
The length of side of the original triangle of internal thread 100 or change external screw thread 200 original triangle the length of side, screw thread it is basic
Parameter is determined according to original triangle, therefore, by the pitch for changing the length of side of original triangle and then after being changed.
In the preferred scheme of the embodiment, the internal thread is metric system standard thread, and the correction of the externally threaded pitch is
0.01-0.05, wherein, the correction be the externally threaded pitch with the absolute value of the difference of the pitch of the internal thread with
The ratio of the pitch of the internal thread.Setting：P is the pitch of the internal thread of standard thread, and P0 is amended externally threaded spiral shell
Away from, then, and correction=| P0-P |/P.Internal thread is designed as metric system standard thread, it is not necessary to which it is unnecessary that internal threads 100 are carried out
Processing, directly use standard thread, reduce use cost.When external screw thread 200 is processed, its pitch can increase
0.01-0.05, it is also possible to reduce 0.01-0.05, flexible and changeable during processing, external screw thread 200 and internal thread after machining
Required axial interference can be obtained in the range of screwing length after 100 cooperations.It is preferably arranged to, the external screw thread 200 is repaiied
Positive quantity is 0.03, interior when being used cooperatively with internal thread 100 after being easy to the processing of external screw thread 200, and the machine-shaping of external screw thread 200
Externally threaded self-locking property is higher, and bonding strength is more preferable.
In the preferred scheme of the embodiment, the external screw thread is metric system standard thread, the amendment of the pitch of the internal thread
It is 0.01-0.05 to measure, wherein, the correction is that the externally threaded pitch is absolute with the difference of the pitch of the internal thread
It is worth the ratio with the externally threaded pitch.Setting, P1 is the externally threaded pitch of standard thread, and Pm is amended internal thread
Pitch, then, and correction=| Pm-P1 |/P1.Unnecessary processing need not be carried out to external screw thread 200, directly use standard spiral shell
Line, reduces use cost.When internal thread 100 is processed, its pitch can increase 0.01-0.05, it is also possible to reduce
0.01-0.05, it is flexible and changeable during processing, internal thread 100 after machining coordinate with external screw thread 200 after by screwing length
Required axial interference is obtained in the range of degree.It is preferably arranged to, the correction of the internal thread 100 is 0.03, is easy to internal thread
After 100 processing, and the machine-shaping of internal thread 100, when being used cooperatively with external screw thread 200, the self-locking property of internal and external threads is higher,
Bonding strength is more preferable.
In the preferred scheme of the implementation, the internal thread 100 or the external screw thread 200 are single thread, screw thread
Convenient processing and manufacture, and itself coupling mechanism force of single thread is big, using pitch interference single thread performance more preferably, locking effect
Fruit is more preferably.External screw thread or internal thread are also an option that to be British standard thread.
The pitch interference thread that the present embodiment is provided, it has a wide range of application, for example：
A. self-locking nut
Self-locking nut species on our times is a lot, has the thin ring of nylon ring self-locking nut, termination to flatten self-locking nut, open
Groove closing in self-locking nut etc. is a lot, the difficult control of these self-locking nut complex structures, processing difficulties, self-locking moment, repeatedly assembly and disassembly
Torque decays quickly, therefore, self-locking nut could not be commonly used in engineering goods.The latching characteristics of pitch interference thread is
Self-locking nut has opened new world out-of-the-way, as long as the internal thread 100 of plain nut is processed into pitch amendment screw thread, can not only be managed
The self-locking property thought can also improve the intensity of connector.The structure of pitch interference thread self-locking nut, profile and production technology with
Plain nut is the same.
B. the connection of double thread stud and body
Need to be screwed into the screw of housing for one end of the stud of TBE (threaded both ends) on machine case by some engineering goods,
It is always a problem how stud to be fixed in screw, can just be fixed stud with certain torque using pitch amendment screw thread
In screw.
C. the connection of screw-thread bush and body
Can also be used for being fixed on screw-thread bush in screw using pitch interference thread latching characteristics.
D. plain edition steel-wire screw-socket is become lock type steel-wire screw-socket
Existing lock type steel-wire screw-socket there are problems that many, influence its popularization and application, by plain edition steel-wire screw-socket dress
The steel-wire screw-socket hole with self-locking is formed in the screw of the pitch amendment screw thread for entering design, that is, increased the spiral shell of light metal material body
Hole strength is but also with reliable auto-lock function.
Threaded connector embodiment
A kind of threaded connector, including the external screw thread and internal thread for cooperating are present embodiments provided, changes described
The original triangle parameter of external screw thread or the internal thread causes the external screw thread and the internal thread for cooperating
Pitch, the externally threaded pitch is the 95%-99% of the pitch of the internal thread；Or the spiral shell of the internal thread
Away from the 95%-99% for the externally threaded pitch, using the connector of the principle mutual cooperation of pitch interference fit screw thread,
All advantages with pitch interference fit screw thread, are not described in detail herein.During reality processing, first for cooperating
Screw thread and the second Design of Screw Thread are pitch interference fit screw thread, and the first screw thread can be standard thread, and the second screw thread is amendment spiral shell
Line, amendment screw thread can be that screw thread on regular screw threads fastener can also be spiral shell on threaded other components of machine
Line.First screw thread can select to be external screw thread or internal thread.
Amendment screwing tool embodiment
Present embodiments provide a kind of amendment screwing tool, including amendment forming internal threads portion, spiral shell in the amendment
The pitch of line forming part is 0.95P-0.99P, wherein, P is the externally threaded standard pitch being engaged with the internal thread；It is aobvious
So, amendment external screw thread forming part can also be included, the pitch of the amendment external screw thread forming part is 0.95P-0.99P, wherein, P
It is the standard pitch of the internal thread being engaged with the external screw thread.Amendment screwing tool can be individually used for processing amendment
The instrument of internal thread, or the individually externally threaded instrument of processing amendment, can also be can either be used for the processing outer spiral shell of amendment
Line, can be also used for the instrument of processing amendment internal thread.
Further, amendment screwing tool can be the one kind in screw tap, cylindrical die roll, screw plate and screw die.
Preferred embodiment of the present utility model is the foregoing is only, the utility model is not limited to, for this
For the technical staff in field, the utility model can have various modifications and variations.It is all it is of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvements made etc. should be included within protection domain of the present utility model.
Claims (10)
1. a kind of pitch interference fit screw thread, it is characterised in that including the external screw thread and internal thread that cooperate, changes described
The original triangle parameter of external screw thread or the internal thread causes the external screw thread and the internal thread for cooperating
With pitch difference, wherein, the externally threaded pitch is the 95%-99% of the pitch of the internal thread；Or the interior spiral shell
The pitch of line is the 95%-99% of the externally threaded pitch.
2. pitch interference fit screw thread according to claim 1, it is characterised in that the internal thread is metric system standard spiral shell
Line, the correction of the externally threaded pitch is 0.01-0.05, wherein, the correction is the externally threaded pitch and institute
State the ratio of absolute value and the pitch of the internal thread of the difference of the pitch of internal thread.
3. pitch interference fit screw thread according to claim 1, it is characterised in that the external screw thread is metric system standard spiral shell
Line, the correction of the pitch of the internal thread is 0.01-0.05, wherein, the correction is the externally threaded pitch and institute
State the ratio of absolute value and the externally threaded pitch of the difference of the pitch of internal thread.
4. pitch interference fit screw thread according to claim 1, it is characterised in that the internal thread is inch standard spiral shell
Line, the correction of the externally threaded pitch is 0.01-0.05, wherein, the correction is the externally threaded pitch and institute
State the ratio of absolute value and the pitch of the internal thread of the difference of the pitch of internal thread.
5. pitch interference fit screw thread according to claim 1, it is characterised in that the external screw thread is inch standard spiral shell
Line, the correction of the pitch of the internal thread is 0.01-0.05, wherein, the correction is the externally threaded pitch and institute
State the ratio of absolute value and the pitch of the internal thread of the difference of the pitch of internal thread.
6. the pitch interference fit screw thread according to claim any one of 1-5, it is characterised in that the external screw thread or/
It it is 60 degree with the thread form angle of the internal thread.
7. a kind of threaded connector, it is characterised in that including the external screw thread and internal thread that cooperate, changes the external screw thread
Or the original triangle parameter of the internal thread causes the pitch of the external screw thread and internal thread for cooperating
, the externally threaded pitch is the 95%-99% of the pitch of the internal thread；Or the pitch of the internal thread is institute
State the 95%-99% of externally threaded pitch.
8. it is a kind of to correct screwing tool, it is characterised in that including amendment forming internal threads portion, the amendment forming internal threads
The pitch in portion is 0.95P-0.99P, wherein, P is the externally threaded standard pitch being engaged with the amendment internal thread.
9. amendment screwing tool according to claim 8, it is characterised in that also including amendment external screw thread forming part,
The pitch of the amendment external screw thread forming part is 0.95P-0.99P, wherein, P is the interior spiral shell being engaged with the amendment external screw thread
The standard pitch of line.
10. the amendment screwing tool according to claim 8 or 9, it is characterised in that the amendment screw thread process work
Tool can be the one kind in screw tap, cylindrical die roll, screw plate and screw die.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621333273.9U CN206234237U (en) | 2016-12-07 | 2016-12-07 | Pitch interference fit screw thread, threaded connector and amendment screwing tool |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621333273.9U CN206234237U (en) | 2016-12-07 | 2016-12-07 | Pitch interference fit screw thread, threaded connector and amendment screwing tool |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206234237U true CN206234237U (en) | 2017-06-09 |
Family
ID=58978761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621333273.9U Active CN206234237U (en) | 2016-12-07 | 2016-12-07 | Pitch interference fit screw thread, threaded connector and amendment screwing tool |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206234237U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438657A (en) * | 2016-12-07 | 2017-02-22 | 石文祥 | Thread pitch interference fit thread, threaded connector and corrected thread machining tool |
| WO2018119847A1 (en) * | 2016-12-29 | 2018-07-05 | 诠丰精密工具股份有限公司 | Threaded screwing engagement structure |
| CN108661995A (en) * | 2018-07-18 | 2018-10-16 | 中国船舶重工集团公司第七0三研究所 | A kind of decreasing worm-pitch screw connection structure |
| CN111120492A (en) * | 2020-02-19 | 2020-05-08 | 中车青岛四方车辆研究所有限公司 | Internal thread changing device and method |
-
2016
- 2016-12-07 CN CN201621333273.9U patent/CN206234237U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106438657A (en) * | 2016-12-07 | 2017-02-22 | 石文祥 | Thread pitch interference fit thread, threaded connector and corrected thread machining tool |
| WO2018119847A1 (en) * | 2016-12-29 | 2018-07-05 | 诠丰精密工具股份有限公司 | Threaded screwing engagement structure |
| CN108661995A (en) * | 2018-07-18 | 2018-10-16 | 中国船舶重工集团公司第七0三研究所 | A kind of decreasing worm-pitch screw connection structure |
| CN111120492A (en) * | 2020-02-19 | 2020-05-08 | 中车青岛四方车辆研究所有限公司 | Internal thread changing device and method |
| CN111120492B (en) * | 2020-02-19 | 2022-03-11 | 中车青岛四方车辆研究所有限公司 | Internal thread changing device and method |
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Effective date of registration: 20190319 Address after: 110 000 No. 76-41 Shenbei Road, Shenyang New District, Shenyang City, Liaoning Province Patentee after: SHENYANG LIYANG MECHANICAL COMPONENT MANUFACTURING Co.,Ltd. Address before: 110043 4-3-1, No. 34-2 Dongling West Road, Dadong District, Shenyang City, Liaoning Province Patentee before: Shi Wenxiang |
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Effective date of registration: 20230801 Address after: 102, Group 2, Hongqi Village, Yuhong Township, Yuhong District, Shenyang City, Liaoning Province, 110000 Patentee after: Ma Zhitao Address before: 110 000 No. 76-41 Shenbei Road, Shenyang New District, Shenyang City, Liaoning Province Patentee before: SHENYANG LIYANG MECHANICAL COMPONENT MANUFACTURING Co.,Ltd. |