CN211174947U - Threaded bushing connecting device - Google Patents
Threaded bushing connecting device Download PDFInfo
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- CN211174947U CN211174947U CN201921861788.XU CN201921861788U CN211174947U CN 211174947 U CN211174947 U CN 211174947U CN 201921861788 U CN201921861788 U CN 201921861788U CN 211174947 U CN211174947 U CN 211174947U
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- thread
- bolt
- threaded
- screw thread
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Abstract
The utility model relates to a threaded bush connecting device, including threaded bush, base member, bolt, the threaded bush is equipped with inside and outside screw thread, the internal thread and the bolt threaded connection of threaded bush, the external screw thread of threaded bush and the internal thread connection of base member make bolt and base member pass through threaded bush transitional coupling, get up small-size bolt screw thread and large-size base member screw thread transitional coupling, play the effect that links up big or small screw thread, reinforcing base member screw thread intensity. In the design of bolt hookup subassembly, will the utility model discloses a screw bush is used for the transition of bolt screw thread and base member screw thread to link up, can show the screw thread intensity that strengthens low strength matrix material through increase base member thread size to the high strength performance of full play bolt guarantees the intensity requirement of bolt hookup.
Description
Technical Field
The utility model relates to a threaded bush, especially a threaded bush connecting device for improving low strength material base member (such as copper alloy, aluminum alloy etc.) screw thread intensity.
Background
In the design of bolt coupling assemblies that employ bolts directly threaded into threaded holes in the base, bolt strength is generally a primary consideration to meet design requirements. However, under the conditions of low strength of the base material and high load on the bolt, the base thread is often damaged due to overlarge load bearing and insufficient thread strength, and at this time, measures are taken to increase the load bearing capacity of the base thread.
The bolt in the bolt connection is usually a standard fastener, the structures such as a thread, a bolt head, a polished rod and the like and the sizes of all parts are specified according to equal strength conditions and use experience, the parts are generally not required to be subjected to strength check, and the main task of the bolt connection design is to determine the diameter of the bolt or perform strength check on a dangerous section of the bolt.
Generally, the strength of the bolt is higher than that of the base material. However, if the difference between the two is large and the strength of the base material is low, the bolt strength often meets the design requirements and the thread strength of the base material is insufficient when the bolt connection design is performed. In order to meet the thread strength requirement of the base material, the bolt strength cannot be fully exerted, so that the bolt material is wasted, and even the bolt connection does not meet the design requirement.
For a base thread with determined material, the bearing capacity is related to the processing mode of the thread and the thread size. The processing methods such as the extrusion tap and the like can improve the bearing capacity of the base thread to a certain extent, but the effect is limited after all. The bearing capacity of the thread ridge can be effectively improved by adopting the measure of increasing the thread size, but the problem that the thread of the base body is not matched with the thread of the connecting bolt is increased.
The thread bushing is used for transitionally connecting the large-size base body threads with the small-size bolt threads, and successfully solves the problem that the strength of the connecting bolt is matched with the bearing capacity of the base body threads.
Disclosure of Invention
The utility model aims to provide a threaded bush connecting device, the device can be used to improve the connecting device of base member material screw thread intensity.
In order to achieve the above purpose, the technical scheme of the utility model is that: a threaded bushing connecting device comprises a threaded bushing, a base body and a bolt, wherein the threaded bushing is provided with an inner thread and an outer thread, the inner thread of the threaded bushing is in threaded connection with the bolt, the outer thread of the threaded bushing is in threaded connection with the inner thread of the base body, the bolt is in transitional connection with the base body through the threaded bushing, small-size bolt threads are in transitional connection with large-size base body threads, and the effects of connecting the large-size threads and the small-size threads and enhancing the thread strength of the base body are achieved.
Furthermore, the inner thread and the outer thread of the threaded bushing are both coarse threads, so that the thread connection strength can be further improved.
Furthermore, the bottom surface of the threaded bushing is flat and is tightly attached to the bottom of the internal thread hole of the base body.
Furthermore, the length of the external thread of the thread bushing is smaller than the effective depth of the internal thread of the base body, so that the external thread of the thread bushing is effectively meshed with the internal thread of the base body, and the strength of the internal thread of the base body is effectively enhanced.
Furthermore, the total length of the threaded bushing is smaller than the depth of the internal thread of the base body, so that the outer end face of the threaded bushing does not protrude out of the outer surface of the base body after the threaded bushing is installed.
Furthermore, the bottom of the threaded bushing is provided with an inner hexagonal screwing outlet, so that the tool is convenient to disassemble and assemble.
The utility model has the advantages that:
in the design of bolt hookup subassembly, will the utility model discloses a screw bush is used for the transition of bolt screw thread and base member screw thread to link up, can show the screw thread intensity that strengthens low strength matrix material through increase base member thread size to the high strength performance of full play bolt guarantees the intensity requirement of bolt hookup.
Drawings
FIG. 1 is a cross-sectional view of a threaded bushing of the present invention;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic view of the application of the threaded bushing connection of the present invention;
FIG. 4 is a graph of a thread flank force analysis of the threads of the base;
fig. 5 is a basic thread form view of a conventional thread having a thread form angle of 60 °.
Detailed Description
The present invention will be further explained with reference to the accompanying drawings and examples.
As shown in figures 1, 2 and 3, the embodiment of the utility model provides a threaded bush connecting device, including threaded bush 1, base member 2, bolt 3. threaded bush 1 is provided with inside and outside screw thread, internal thread size M1, the internal thread is connected with bolt thread, external thread size M2, the internal thread of external screw thread and base member 1 is connected, the inside and outside screw thread of threaded bush 1 is coarse thread, can further improve base member screw thread intensity, the external screw thread length L1 of threaded bush 1 is less than the effective degree of depth of internal thread of base member, guarantee that the external screw thread of threaded bush 1 effectively meshes with the internal thread of base member 2, guarantee that base member screw thread intensity obtains strengthening, the total length L of threaded bush 1 is less than the internal thread degree of depth of base member 2, guarantee that the outer terminal surface does not emerge the base member surface after threaded bush 1 has installed, threaded bush 1's bottom has interior hexagonal to twist the export, make things convenient for the tool dismouting the bottom surface of threaded bush is level and clean, after the base member screw thread is twisted with the.
In specific application, as shown in fig. 3, the external thread of the threaded bushing 1 is firstly connected with the internal thread of the base body 2, one end of the bolt 3 is connected with the internal thread of the threaded bushing 1 after penetrating through the connected piece 4, and then the super bolt fastener 5 is locked and fixedly connected with the other end of the bolt 3.
With reference to the calculation method of "mechanical design" (seventh edition, edited by mechanical principles and mechanical parts teaching and research laboratory of northwest university of industry, pujinggu, jiri cuing) ", 5-9 screw drive, (iii) design calculation of sliding screw drive, 3. calculation of strength of nut thread", a check calculation of the thread strength of the base thread is performed (thread stress analysis is shown in fig. 4):
a) the bending strength condition of the root of the thread is
b) The shear strength condition of the root of the thread is
In the formula, F is the maximum axial load borne by the bolt;
d is the major diameter (nominal diameter) of the base thread;
b is the thread root thickness, for a rectangular thread, b is 0.5P, for a trapezoidal thread, b is 0.65P, for a buttress thread with a profile angle of 60 °, b is 0.75P, P is the thread pitch;
l is the bending force arm,
D2is the pitch diameter of the base thread;
u is the number of working turns of the thread,
L1the effective engagement length of the thread bush and the thread of the base body (namely the length of the external thread of the thread bush);
[σw]allowable bending stress of the base material;
[ tau ] is the allowable shear stress of the base material.
The bolt connection is generally made of common threads, i.e. saw-tooth threads with a 60 ° profile angle. According to the basic profile diagram shown in fig. 5, the bending moment arm is calculated during the checking of the bending strength of the root of the thread
H is the height of the original triangle of the basic tooth form,
therefore, the conditions of the bending strength and the shearing strength of the root of the thread can be converted into
It can be seen that the maximum axial load F on the bolt, the effective engagement length of the threaded bushing with the threads of the base L1In certain instances, the bending and shear stresses at the root of the base thread are inversely proportional to the nominal diameter of the base thread, i.e., the load carrying capacity of the base thread is directly proportional to the nominal diameter of the base thread.
The utility model discloses a screw thread bush links up the large-size base member screw thread with the bolt screw thread transition of small-size, and base member screw thread bearing capacity increase multiple is the ratio of base member screw thread nominal diameter and bolt screw thread nominal diameter promptly, the ratio of screw thread bush external screw thread, internal thread nominal diameter promptly.
Claims (6)
1. The utility model provides a threaded bush connecting device, includes threaded bush, base member, bolt, its characterized in that: the threaded bush is provided with an inner thread and an outer thread, the inner thread of the threaded bush is in threaded connection with the bolt, the outer thread of the threaded bush is in threaded connection with the inner thread of the base body, the bolt is in transitional connection with the base body through the threaded bush, the small-size bolt threads are in transitional connection with the large-size base body threads, and the effects of connecting the large-size threads and the small-size threads and enhancing the thread strength of the base body are achieved.
2. The threaded bushing connection of claim 1, wherein: the internal thread and the external thread of the threaded bushing are both coarse threads, so that the thread connection strength can be further improved.
3. The threaded bushing connection of claim 1, wherein: the bottom surface of the threaded bushing is smooth and is tightly attached to the bottom of the internal thread hole of the base body.
4. The threaded bushing connection of claim 1, wherein: the external thread length of the thread bushing is smaller than the effective depth of the internal thread of the base body, so that the external thread of the thread bushing can be effectively meshed with the internal thread of the base body, and the thread strength of the base body is effectively enhanced.
5. The threaded bushing connection of claim 1, wherein: the total length of the threaded bushing is smaller than the depth of the internal thread of the base body, so that the outer end face of the threaded bushing does not protrude out of the outer surface of the base body after the threaded bushing is installed.
6. The threaded bushing connection of claim 1, wherein: the bottom of the threaded bushing is provided with a hexagon socket screwed in screwing outlet, so that tools can be conveniently disassembled and assembled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921861788.XU CN211174947U (en) | 2019-10-31 | 2019-10-31 | Threaded bushing connecting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921861788.XU CN211174947U (en) | 2019-10-31 | 2019-10-31 | Threaded bushing connecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211174947U true CN211174947U (en) | 2020-08-04 |
Family
ID=71806392
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921861788.XU Active CN211174947U (en) | 2019-10-31 | 2019-10-31 | Threaded bushing connecting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211174947U (en) |
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2019
- 2019-10-31 CN CN201921861788.XU patent/CN211174947U/en active Active
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