CN113339379B - Threaded connection structure and design method thereof - Google Patents
Threaded connection structure and design method thereof Download PDFInfo
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- CN113339379B CN113339379B CN202110619077.7A CN202110619077A CN113339379B CN 113339379 B CN113339379 B CN 113339379B CN 202110619077 A CN202110619077 A CN 202110619077A CN 113339379 B CN113339379 B CN 113339379B
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- 238000000034 method Methods 0.000 title claims abstract description 12
- 239000002184 metal Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000006073 displacement reaction Methods 0.000 abstract description 13
- 230000005540 biological transmission Effects 0.000 abstract description 9
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000003003 spiro group Chemical group 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B33/00—Features common to bolt and nut
- F16B33/02—Shape of thread; Special thread-forms
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
Abstract
The invention relates to the technical field of connecting structures, and particularly discloses a threaded connecting structure and a design method thereof, wherein the threaded connecting structure comprises: the first connecting piece is provided with an internal thread, and the lead of the internal thread is a first lead P1; the second connecting piece is provided with an external thread, the lead of the external thread is a second lead P2, and | P1-P2| = ≠ 0; the length of the threaded connection between the internal thread and the external thread is H; if P1 is more than P2, the thickness of the teeth of the internal thread is P1/2, and the distance L1 between two adjacent spiral surfaces in two adjacent teeth of the external thread is more than or equal to P2/2+ delta H/P1; if P1 is less than P2, the thickness of the teeth of the external thread is P2/2, and the distance L2 between two adjacent spiral surfaces in two adjacent teeth of the internal thread is more than or equal to P1/2+ delta H/P2. The lead of the internal thread of the threaded connection structure is not equal to the lead of the external thread, and after the threaded connection structure is stressed, the displacement of each circle of thread is unequal, and the deformation rates are equal, so that each circle of thread of the threaded connection structure is stressed uniformly, and higher transmission strength of the threaded connection structure is realized.
Description
Technical Field
The invention relates to the technical field of connecting structures, in particular to a threaded connecting structure and a design method thereof.
Background
In the prior art, when a screw (or a bolt) is connected with a nut, the screw pitch of the screw (or the bolt) is the same as that of the nut, so as to ensure smooth screwing. The screw (or bolt) with the same lead is matched with the nut, and because the lead is the same, under the loaded condition, the displacement of each tooth is equal, but the corresponding deformation rate of each thread is different, namely the stress state of each thread is different; the first turn of the thread, closest to the location of the load, carries about 60% of the load; the load on the second thread is about 30%; the load on the remaining threads is about 10%; therefore, the effective stress thickness of the threads is 2.5 times of the thread pitch, so that when the first turn of threads fails, the second turn of threads and the threads on the side, away from the first turn of threads, of the second turn of threads do not reach the limit stress state, the second turn of threads and the threads on the side, away from the first turn of threads, of the second turn of threads play a small role, and the load capacity of the screw (or the bolt) and the nut in the transmission process is poor.
Disclosure of Invention
An object of the present invention is to provide a threaded connection structure and a design method thereof to improve the stress uniformity of each turn of threads of a threaded connection part thereof, and to make full use of the threaded part, thereby achieving higher transmission strength of the threaded connection structure.
In order to achieve the purpose, the invention adopts the following technical scheme:
a threaded connection, comprising:
the first connecting piece is provided with an internal thread, and the lead of the internal thread is a first lead P1;
the second connecting piece is provided with an external thread screwed with the internal thread, the lead of the external thread is a second lead P2, and | P1-P2| =Δ ≠ 0; the length of the threaded connection between the internal thread and the external thread is H; if the P1 is larger than the P2, the thickness of the teeth of the internal thread is P1/2, and the distance L1 between two adjacent spiral surfaces in two adjacent teeth of the external thread is more than or equal to P2/2+ delta H/P1; if the P1 is less than the P2, the thickness of the teeth of the external thread is P2/2, and the distance L2 between two adjacent spiral surfaces in two adjacent teeth of the internal thread is more than or equal to P1/2+ delta H/P2.
Preferably, the P1 > P2, the L1= P2/2+ Δ = (N-1) × H/P1, and in a case where the first and second connecting members are unloaded, a clearance hN = (N-1) × Δ of two adjacent teeth of the female and male screws, where N =1, 2' \8230 \ 8230: \ 8230: -Y1 one pair of threaded teeth of the outermost screw threads of the female and male screws, Y2 of the pair of threaded teeth of the adjacent screw threads of the Y1, and so on, another pair of threaded teeth of the outermost screw threads of the female and male screws, a clearance H1 of the Y1, a clearance H2 of the Y2, and so on, a clearance hN of the YN is hN.
Preferably, the P1 < P2, the L2= P1/2 +. Δ H/P2, and in the unloaded condition of the first and second connection members, a clearance hN = (N-1) × Δ of two adjacent teeth of the female and male threads, where N =1, 2' \8230 \ 8230;, where one pair of threaded teeth of the outermost thread of the female and male threads is Y1, the pair of threaded teeth of the adjacent thread of the Y1 is Y2, and so on, and the other pair of threaded teeth of the outermost thread of the female and male threads is YN, a clearance of the Y1 is H1, a clearance of the Y2 is H2, and so on, a clearance of the YN is hN.
Preferably, Δ = ∈ 1 × p1+ ∈ 2 × p2, where ∈ 1 is the elongation at break of the first connection element and ∈ 2 is the elongation at break of the second connection element.
Preferably, the first connecting member is made of plastic, the second connecting member is made of metal, and Δ = ∈ 1 × p1.
Preferably, the second connection element is made of plastic, the first connection element is made of metal, and Δ = ∈ 2 × p2.
Preferably, the first connecting piece is a nut, and the second connecting piece is a bolt.
Preferably, the first connecting piece is a nut, and the second connecting piece is a screw.
Preferably, the first connecting piece is a nut, and the second connecting piece is a screw.
In order to achieve the purpose, the invention adopts the following technical scheme:
a threaded connection structure design method for a threaded connection structure as described above, the threaded connection structure design method comprising:
s1, determining materials of a first connecting piece and a second connecting piece;
s3, determining one of the lead P1 of the first connecting piece and the lead P2 of the second connecting piece;
and S2, calculating the delta and the other of the lead P1 of the first connecting piece and the lead P2 of the second connecting piece according to the delta = | P1-P2| = epsilon 1-P1 + epsilon 2-p2.
The invention has the beneficial effects that:
the lead of the internal thread of the threaded connection structure is not equal to the lead of the external thread, when the threaded connection structure is stressed, the displacement of each circle of thread is unequal, and the deformation rates are equal, so that each circle of thread of the threaded connection structure is stressed uniformly, each circle of thread is fully utilized, and the threaded connection structure is higher in transmission strength. L1 is more than or equal to P2/2+ delta H/P1 or L2 is more than or equal to P1/2+ delta H/P2, namely if the first lead P1 of the first connecting piece is more than the second lead P2 of the second connecting piece, the thickness of the teeth of the second connecting piece needs to be reduced, so that the teeth of the first connecting piece are contained between the two teeth of the second connecting piece under the condition of no pressure, and the first connecting piece is smoothly screwed into the second connecting piece; on the contrary, if the first lead P1 of the first connecting member is smaller than the second lead P2 of the second connecting member, the thickness of the teeth of the first connecting member needs to be reduced, so that the teeth of the second connecting member are accommodated between the two teeth of the screw rod without being pressed, and the first connecting member is smoothly screwed into the second connecting member.
Drawings
FIG. 1 is a schematic view of a threaded connection provided by an embodiment of the present invention when unloaded;
fig. 2 is a schematic structural view of a fully loaded threaded connection according to an embodiment of the present invention.
In the figure:
1. a bolt;
2. a nut; 21. a first tooth; 22. a second tooth; 23. a third tooth; 24. and a fourth tooth.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the present invention, the directional terms such as "upper", "lower", "left", "right", "inner" and "outer" are used for easy understanding without making a contrary explanation, and thus do not limit the scope of the present invention.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment provides a threaded connection structure to improve each circle screw thread atress homogeneity of its screw thread spiro union part, make full use of screw thread part, thereby realize the higher transmission intensity of threaded connection structure.
As shown in fig. 1, the threaded connection structure provided in this embodiment includes a first connection member and a second connection member, the first connection member has an internal thread, the second connection member has an external thread screwed with the internal thread, wherein the first connection member is a nut 2, the second connection member is a bolt 1, a screw or a screw, and the embodiment takes the second connection member as the bolt 1 for example.
The lead of the internal thread is a first lead P1, the lead of the external thread is a second lead P2, and | P1-P2| = Δ ≠ 0. The screw connection length of the internal thread and the external thread is H, if P1 is more than P2, the thickness of the teeth of the internal thread is P1/2, and the distance L1 between two adjacent spiral surfaces in two adjacent teeth of the external thread is more than or equal to P2/2+ delta H/P1; if P1 is less than P2, the thickness of the teeth of the external thread is P2/2, and the distance L2 between two adjacent spiral surfaces in two adjacent teeth of the internal thread is more than or equal to P1/2+ delta H/P2.
The helical pitch of the internal thread of the threaded connection structure that this embodiment provided does not equal to the helical pitch of external screw thread, and after the threaded connection structure atress, the displacement volume of each circle screw thread varies, and the deformation rate equals to make each circle screw thread atress of threaded connection structure more even, each circle screw thread of make full use of realizes the higher transmission intensity of threaded connection structure, makes its bearing capacity improve more than 50%. L1 is more than or equal to P2/2+ Delta H/P1 or L2 is more than or equal to P1/2+ Delta H/P2, namely if the first lead P1 of the nut 2 is more than the second lead P2 of the bolt 1, the thickness of the teeth of the bolt 1 needs to be thinned, so that the teeth of the nut 2 are accommodated between the two teeth of the bolt 1 under the condition of no pressure, and the nut 2 is smoothly screwed into the bolt 1; on the contrary, if the first lead P1 of the nut 2 is smaller than the second lead P2 of the bolt 1, the thickness of the teeth of the nut 2 needs to be reduced so that the teeth of the bolt 1 are accommodated between the two teeth of the screw without being pressed, and the nut 2 is smoothly screwed into the bolt 1.
If P1 > P2, L1= P2/2 +. Delta.h/P1, in the unloaded condition of the nut 2 and the bolt 1, the clearance hN = (N-1). Delta.two adjacent teeth of the internal thread and the external thread, where N =1,2 \8230;, where one pair of threaded teeth on the outermost side of the internal thread and the external thread is Y1, one pair of threaded teeth adjacent to Y1 is Y2, and so on, the other pair of threaded teeth on the outermost side of the internal thread and the external thread is YN, the clearance of Y1 is H1, the clearance of Y2 is H2, and so on, the clearance of YN is hN.
Similarly, when P1 is less than P2, L2= P1/2+ Delta H/P2, under the condition that the nut 2 and the bolt 1 are unloaded, the clearance hN = (N-1) · Delta between two adjacent teeth of the internal thread and the external thread, wherein N =1,2 \8230;, wherein one pair of threaded teeth of the outermost side of the internal thread and the external thread is Y1, one pair of threaded teeth of the adjacent Y1 is Y2, and so on, the other pair of threaded teeth of the outermost side of the internal thread and the external thread is YN, the clearance of Y1 is H1, the clearance of Y2 is H2, and so on, the clearance of YN is hN.
As shown in fig. 1, when the screw connection structure is unloaded or the bolt 1 starts to move relative to the nut 2 (the nut 2 is pressed downward), the screw surfaces of the nut 2 and the nut 2 of the pair of teeth Y1 located at the lowermost position in fig. 1 first contact each other, and when N =4 is used as an example:
helicoid gap h1=0 for Y1;
the helicoid clearance h2=Δof Y2;
helicoidal gap h3=2 x Δ of Y3;
helicoidal gap h4=3 Δ of Y4.
As shown in fig. 2, when the nut 2 is pressed downward (i.e. downward force is applied to the nut 2 as shown by the arrow in fig. 2), the first pair of teeth (i.e. the pair of teeth at the lowest side) first enters into the transmission, and the first pair of teeth starts to be stressed; when the nut 2 rotates and the torque is further increased, the second pair of teeth (the pair of teeth adjacent to the first pair of teeth) starts to enter the transmission, and at the moment, the first pair of teeth is stressed, the second pair of teeth starts to be stressed, h2=0, h3= Δ, and h4=2 × Δ; continuing to press the nut 2 downwards, further increasing the moment, enabling the third pair of teeth to enter transmission, enabling the first pair of teeth and the second pair of teeth to be stressed at the moment, enabling the third pair of teeth to be stressed, and enabling h3=0 and h4= delta; the rotation torque of the nut 2 is further increased, the fourth pair of teeth starts to bear force, and h4=0; until four to the tooth all get into the meshing and four of nut 2 or bolt 1 are to when the tooth stress that receives is all when reaching the biggest bearing, four are to the tooth when all reaching the maximum strain state promptly, just reach threaded connection's the biggest stress state, this moment:
the sum of the total deformation and displacement of the first pair of teeth is: e 1 x 4 p1+ e 2 x 4 p2;
the sum of the total deformation and displacement of the second pair of teeth is: e 1 x 4 x p1+ e 2 x 3 x p2;
the sum of the total deformation and displacement of the third pair of teeth is: e 1 x 4 x p1+ e 2 x p2;
the sum of the total deformation and displacement of the fourth pair of teeth is: e 1 x 4 p1+ e 2 x 1 p2.
That is, the threaded connection structure provided by this embodiment can make the deformation rate of each tooth of the threaded connection the same, and the displacement amounts are different, so that the stress of each tooth is equal, and further, when the threaded connection structure is under load, each tooth of the threaded connection can play a role.
The magnitude of Δ value of the threaded connection structure provided in this example is related to the amount of deformation under the maximum load to which the threaded connection structure is subjected, i.e., Δ = ∈ 1 × p1+ ∈ 2 × p2, where ∈ 1 is the elongation at break of the nut 2, and ∈ 2 is the elongation at break of the bolt 1.
The nut 2 is made of plastic and the bolt 1 is made of metal, in which case the rigidity of the nut 2 is much less than the rigidity of the bolt 1, i.e. the elongation at break of the nut 2 is much greater than the elongation at break of the bolt 1, so e 2 p2 can be ignored and Δ = e 1 p1. When the maximum stress state of the threaded connection structure is as follows:
the sum of the total deformation and displacement of the first teeth 21 of the nut 2 is: epsilon 1 × 4 × P1;
the sum of the total deformation and displacement of the second teeth 22 of the nut 2 is: epsilon 1 × 4 × P1;
the sum of the total deformation and displacement of the third teeth 23 of the nut 2 is: epsilon 1 × 4 × P1;
the sum of the total deformation and displacement of the fourth teeth 24 of the nut 2 is: ε 1 × 4 × P1.
In other alternative embodiments, the bolt 1 is made of plastic and the nut 2 is made of metal, e 1 p1 can be omitted, and Δ = e 2 p2.
The embodiment further provides a method for designing the threaded connection structure, which is used for designing the threaded connection structure, and the method for designing the threaded connection structure comprises the following steps:
s1, determining the materials of a nut 2 and a bolt 1;
s3, determining one of the lead P1 of the nut 2 and the lead P2 of the bolt 1;
s2, Δ = | P1-P2| = ∈ 1 ∈ P1+ ∈ 2 ∈ P2, and the other of the lead P1 of the nut 2 and the lead P2 of the bolt 1 is calculated.
That is, Δ is determined based on one of the lead P1 of the nut 2 and the lead P2 of the bolt 1 and the materials of the nut 2 and the bolt 1. The materials of the nut 2 and the bolt 1 are preliminarily determined according to the conventional design method of the nut 2 and the bolt 1, which is the prior art, and thus, the detailed description thereof is omitted.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A threaded connection, comprising:
the first connecting piece is provided with an internal thread, and the lead of the internal thread is a first lead P1;
the second connecting piece is provided with an external thread screwed with the internal thread, the lead of the external thread is a second lead P2, and | P1-P2| =Δ ≠ 0; the screw connection length of the internal thread and the external thread is H; if the P1 is larger than the P2, the thickness of the teeth of the internal thread is P1/2, and the distance L1 between two adjacent spiral surfaces in two adjacent teeth of the external thread is more than or equal to P2/2+ delta H/P1; if the P1 is less than the P2, the thickness of the teeth of the external thread is P2/2, and the distance L2 between two adjacent spiral surfaces in two adjacent teeth of the internal thread is more than or equal to P1/2+ delta H/P2.
2. The threaded connection according to claim 1, characterized in that P1 > P2, L1= P2/2+ Δ H/P1, and in the unloaded condition of the first and second connection pieces, the clearance hN = (N-1) × of two adjacent teeth of the internal thread and the external thread, where N =1,2 \8230, the outermost pair of threaded teeth of the internal thread and the external thread is Y1, the adjacent pair of threaded teeth of the Y1 is Y2, and so on, the other outermost pair of threaded teeth of the internal thread and the external thread is YN, the clearance of Y1 is H1, the clearance of Y2 is H2, and so on, the clearance of YN is hN.
3. The threaded connection according to claim 1, wherein P1 < P2, L2= P1/2+ Δ H/P2, and wherein, in the unloaded condition of the first and second connection pieces, a clearance hN = (N-1) ×, where N =1,2 \8230 \8230whereone pair of threaded teeth of the internal thread and the external thread outermost side is Y1, and the pair of threaded teeth adjacent to Y1 is Y2, and so on, and another pair of threaded teeth of the internal thread and the external thread outermost side is YN, a clearance H1 of Y1, a clearance H2 of Y2, and so on, and a clearance hN of YN.
4. A threaded connection according to any one of claims 1 to 3, characterized in that Δ = s1 p1+ s2 p2, said s1 being the elongation at break of said first connection element and said s2 being the elongation at break of said second connection element.
5. The threaded connection according to claim 4, characterized in that said first connection element is made of plastic and said second connection element is made of metal, and said Δ = ε 1 × P1.
6. The threaded connection according to claim 4, characterized in that said second connection is made of plastic, said first connection is made of metal, and said Δ = ε 2 × P2.
7. A threaded connection according to claim 1, characterized in that the first connection is a nut (2) and the second connection is a bolt (1).
8. A threaded connection according to claim 1, characterized in that said first connection is a nut (2) and said second connection is a screw.
9. A threaded connection according to claim 1, characterized in that said first connection is a nut (2) and said second connection is a screw.
10. A threaded connection structure design method for designing the threaded connection structure of any one of claims 1 to 9, the threaded connection structure design method comprising:
s1, determining materials of a first connecting piece and a second connecting piece;
s3, determining one of the lead P1 of the first connecting piece and the lead P2 of the second connecting piece;
s2, calculating Δ and the other of the lead P1 of the first connection and the lead P2 of the second connection from Δ = | P1-P2| = ∈ 1 × P1+ ∈ 2 × P2.
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| CN202110619077.7A CN113339379B (en) | 2021-06-03 | 2021-06-03 | Threaded connection structure and design method thereof |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101627248A (en) * | 2006-01-26 | 2010-01-13 | B·W·拉莫斯 | Threaded pipe connects |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7007984B2 (en) * | 2002-11-21 | 2006-03-07 | Torquelock Corporation | Hang-free thread design |
| DE102010043589A1 (en) * | 2010-11-08 | 2012-05-10 | Baier & Michels Gmbh & Co. Kg | Thread-generating nut, blank for producing the nut and screw connection of nut and bolt |
| CN104033462B (en) * | 2014-06-10 | 2018-03-23 | 福建海源自动化机械股份有限公司 | A kind of prestressing force thread device and preparation method thereof and application |
| CN104842541A (en) * | 2015-04-29 | 2015-08-19 | 浙江华彩化工有限公司 | Extruding system of extruding machine |
| CN205626001U (en) * | 2016-04-08 | 2016-10-12 | 北京瑞朗泰科医疗器械有限公司 | Medical anchor |
| CN208578954U (en) * | 2018-06-14 | 2019-03-05 | 上海亿泊材料应用技术有限公司 | A kind of inserts and injection made gear |
| CN111927324A (en) * | 2020-09-16 | 2020-11-13 | 威海市海泰起重机械有限公司 | Squeezing and expanding drilling tool, squeezing and expanding pile machine and squeezing and expanding pile forming construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101627248A (en) * | 2006-01-26 | 2010-01-13 | B·W·拉莫斯 | Threaded pipe connects |
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