CN217633344U - Ending thread fastener - Google Patents
Ending thread fastener Download PDFInfo
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- CN217633344U CN217633344U CN202220165225.2U CN202220165225U CN217633344U CN 217633344 U CN217633344 U CN 217633344U CN 202220165225 U CN202220165225 U CN 202220165225U CN 217633344 U CN217633344 U CN 217633344U
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- thread
- ending
- threaded fastener
- fastener
- transition section
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Abstract
The utility model relates to a thread fastener of ending, belong to fastening components's technical field, including screw thread portion and polished rod portion, be equipped with the changeover portion of ending between screw thread portion and the polished rod portion, the arc radius R of ending of changeover portion is that 0.165P < R < 0.2P, the changeover portion of ending is L < 1.5P along the axial length L of thread fastener, wherein, P is the pitch, this application is for reducing the cracked risk of thread fastener effectively, the factor of safety that reinforcing thread fastener used, a thread fastener of ending is provided.
Description
Technical Field
The present application relates to the field of fastening components, and more particularly, to a final threaded fastener.
Background
A threaded fastener is a mechanical part with internal or external threads, which is generally used as a fastener to facilitate the assembly of multiple components. The most common threaded fasteners are screws, nuts, threaded fasteners, and the like.
The thread is used as an important part of the threaded fastener and comprises a guide thread part, a complete thread part and a final thread part, when the fastener works, the fastener is screwed into a nut or a machine body in a rotating mode through the guide thread part, then the complete thread part bears and fixes, and the final thread part cannot be screwed into the nut or the machine body; the ending thread is a place where the stress from the thread to the polished rod part is easy to concentrate, and the thread fastener is easy to break due to the stress concentration at the transition part of the ending of the thread, so that the problem is difficult to solve all the time.
Disclosure of Invention
In order to effectively reduce the risk of fracture of the threaded fastener and enhance the safety factor of use of the threaded fastener, the application provides a thread-ending fastener.
The application provides a pair of thread tightening spare of ending adopts following technical scheme:
the ending threaded fastener comprises a threaded portion and a polished rod portion and is characterized in that an ending transition section is arranged between the threaded portion and the polished rod portion, the ending arc radius R of the ending transition section is more than 0.165P and less than 0.2P, the length L of the ending transition section along the axial direction of the threaded fastener is more than L and less than 1.5P, and P is a thread pitch.
Through adopting above-mentioned technical scheme, set up the final phase transition between screw thread portion and polished rod portion, increase the stress area between screw thread portion and the polished rod portion, make the internal stress between screw thread portion and the polished rod portion increase to reinforcing screw thread final phase intensity, reducing effectively that screw thread bottom of a tooth, crest are because of the cracked risk of the screw fastener that the stress concentration that the breakpoint caused arouses, improve screw fastener's fatigue resistance, reinforcing screw fastener's factor of safety of using.
Preferably, the minor thread diameter of the ending transition section is the same as that of the threaded part.
Through adopting above-mentioned technical scheme, the screw thread path that utilizes the final transition section is the same with the screw thread path of screw thread portion, has reduced the processing degree of difficulty of threaded fastener, reduce cost, and the structural strength of the same structure reinforcing final transition section of screw thread path has increased the internal stress of final transition section simultaneously to improve threaded fastener's fatigue resistance, reinforcing threaded fastener's factor of safety of using.
Preferably, the thread minor diameter of the ending transition section gradually increases along the axial direction of the threaded fastener and towards the smooth rod part.
Through adopting above-mentioned technical scheme, set up the gradually crescent excircle of ending changeover portion of screw thread path and make screw thread portion can more smooth transition to polished rod portion on the surface, the required helical pitch of complete profile of tooth to the end of screw thread has been reduced, the stress area has been increased simultaneously, thereby reinforcing screw thread ending department intensity, reduce the screw thread bottom of a thread effectively, the crest is because of the cracked risk of the screw fastener that the stress concentration that the breakpoint caused arouses, improve screw fastener's fatigue resistance, reinforcing screw fastener's factor of safety of using.
Preferably, the axial length of the threaded portion is greater than the axial length of the terminal transition section.
Through adopting above-mentioned technical scheme, the axial length of screw thread portion is greater than the axial length of ending changeover portion, makes screw thread portion can assemble work effectively to reduce the possibility that ending screw thread is twisted into nut or organism, improve threaded fastener's life.
Preferably, one end of the threaded portion, which is far away from the polished rod portion, is provided with a chamfer.
Through adopting above-mentioned technical scheme, set up the chamfer in the one end of screw thread portion, make the threaded fastener during operation can be more easily with the rotatory nut or the organism of twisting of threaded fastener to make things convenient for threaded fastener's dismouting.
Preferably, the thread part has a trapezoidal thread, a rectangular thread, a zigzag thread, a triangular thread or other special-shaped threads.
Through adopting above-mentioned technical scheme, during the preparation, trapezoidal thread, rectangle screw thread, zigzag thread, triangle-shaped screw thread or other special shape screw threads can be selected according to the in-service use needs to make threaded fastener can adapt to different operational environment.
Preferably, the polishing rod further comprises a screw cap part connected to one end of the polishing rod part away from the threaded part, and the screw cap part is integrally formed with the polishing rod part.
Through adopting above-mentioned technical scheme, the effect that sets up the screw cap portion can make things convenient for dismouting threaded fastener more when using, and screw cap portion and polished rod portion integrated into one piece can effectively increase threaded fastener's structural strength simultaneously to improve threaded fastener's fatigue resistance, reinforcing threaded fastener's the factor of safety of using.
Preferably, the shape of the screw cap part is a countersunk head shape, a discoidal head shape, a flat round head shape or a regular polygon shape.
Through adopting above-mentioned technical scheme, during the preparation, countersunk head type, coiled head type, flat button head type or regular polygon can be selected according to in-service use needs to the screw cap portion to make threaded fastener can adapt to different operational environment.
In summary, the present application includes at least one of the following beneficial technical effects:
the ending transition section is arranged between the thread part and the polished rod part, so that the stress area between the thread part and the polished rod part is increased, the internal stress between the thread part and the polished rod part is increased, the strength of the ending part of the thread is enhanced, the risk of fracture of the threaded fastener caused by stress concentration caused by break points at the thread bottom and the thread top is effectively reduced, the fatigue resistance of the threaded fastener is improved, and the safety coefficient of the threaded fastener is enhanced;
the thread small diameter of the ending transition section is the same as that of the thread part, so that the processing difficulty of the threaded fastener is reduced, the cost is reduced, meanwhile, the structure with the same thread small diameter enhances the structural strength of the ending transition section, and the internal stress of the ending transition section is increased, so that the fatigue resistance of the threaded fastener is improved, and the safety coefficient of the threaded fastener in use is enhanced;
the thread part can be smoothly transited to the outer circle surface of the polished rod part by arranging the ending transition section with the gradually increased small diameter of the thread, the lead of the thread from a complete thread form to the end is reduced, and the stress area is increased, so that the strength of the ending part of the thread is enhanced, the risk of the thread fastener breakage caused by stress concentration caused by a break point at the thread root and the thread crest is effectively reduced, the fatigue resistance of the thread fastener is improved, and the safety coefficient of the use of the thread fastener is enhanced;
the axial length of the thread part is greater than that of the ending transition section, so that the thread part can be effectively assembled, the possibility that ending threads are screwed into a nut or a machine body is reduced, and the service life of the threaded fastener is prolonged.
Drawings
Fig. 1 is a schematic view of the overall structure in embodiment 1 of the present application.
Fig. 2 is an overall half sectional view in embodiment 1 of the present application.
Fig. 3 is a partial view a in embodiment 1 of the present application.
Fig. 4 is an overall half sectional view in embodiment 2 of the present application.
Fig. 5 is a partial view B in embodiment 2 of the present application.
Description of reference numerals: 1. a threaded portion; 11. chamfering; 2. a polished rod section; 3. a final transition section; 4. a screw cap part.
Detailed Description
The present application is described in further detail below with reference to figures 1-5.
The embodiment of the application discloses a thread fastener.
Example 1:
referring to fig. 1, the final thread fastener comprises a thread part 1 and a polished rod part 2, wherein the thread part 1 adopts a metric system, and the nominal size is between M3 and M30, and in the embodiment, the nominal size adopts M20X2.0; one end that threaded portion 1 kept away from polished rod portion 2 is provided with chamfer 11, through setting up chamfer 11 in the one end of threaded portion 1, makes the threaded fastener during operation can be more easily with the rotatory nut or the organism of twisting of threaded fastener to make things convenient for threaded fastener's dismouting.
Referring to fig. 1 and 2, a final transition section 3 is arranged between the threaded portion 1 and the polished rod portion 2, the radius of a final arc of the final transition section 3 is R, specifically, the radius of the final arc of the final transition section 3 is in the range of 0.165P < R < 0.2P, in this embodiment, R =0.18P, and the radius of the final arc of the final transition section 3 is set to 0.18P, so that the final transition section 3 meets the maximum internal stress and simultaneously reduces the overall weight of the bolt fastener, thereby facilitating the assembly and use in special fields; the axial length of ending changeover portion 3 along threaded fastener is L, it is concrete, L < 1.5P, in this embodiment, L =1P, the axial length L of ending changeover portion 3 sets up to 1P, make ending changeover portion 3 lengthen the effective use length of screw thread portion 1 when according with the biggest internal stress, effectively reduced bolt fastener's whole weight, thereby be convenient for the assembly of special areas to use, in this embodiment, P =2, the ending circular arc radius R that can obtain ending changeover portion 3 sets up to R =0.36, the axial length L of ending changeover portion 3 sets up to L =2.
Referring to fig. 3, in this embodiment, the screw thread path of ending changeover portion 3 is the same with the screw thread path of screw thread portion 1, the screw thread path that utilizes ending changeover portion 3 is the same with the screw thread path of screw thread portion 1, the processing degree of difficulty of threaded fastener has been reduced, and the cost is reduced, the structural strength of the same structure reinforcing ending changeover portion 3 of screw thread path has simultaneously increased ending changeover portion 3's internal stress, thereby improve threaded fastener's fatigue resistance, reinforcing threaded fastener's factor of safety of using.
Referring to fig. 1, the axial length of the threaded portion 1 is greater than that of the final transition section 3, so that the threaded portion 1 can be effectively assembled, thereby reducing the possibility of screwing the final thread into a nut or a machine body and prolonging the service life of the threaded fastener.
Referring to fig. 1 and 2, in the present embodiment, the thread form of the thread portion 1 is a trapezoidal thread, in other embodiments, the thread form of the thread portion 1 may be a rectangular thread, a zigzag thread, a triangular thread, or other special-shaped threads, and during manufacturing, the thread form of the thread portion 1 may be selected according to actual use requirements, so that the threaded fastener can adapt to different working environments.
Referring to fig. 1, the final threaded fastener further comprises a nut portion 4, the nut portion 4 is connected to one end, away from the threaded portion 1, of the polished rod portion 2, and the nut portion 4 is arranged to enable the threaded fastener to be more conveniently disassembled and assembled when in use; the nut portion 4 and the polished rod portion 2 are integrally formed, and the nut portion 4 and the polished rod portion 2 are integrally formed, so that the structural strength of the threaded fastener can be effectively improved, the fatigue resistance of the threaded fastener is improved, and the safety coefficient of the threaded fastener in use is enhanced.
Referring to fig. 2, in the present embodiment, the shape of the nut portion 4 is a countersunk shape, in other embodiments, the shape of the nut portion 4 may be a disc shape, a flat round head shape, or a regular polygon, and during manufacturing, the nut portion 4 may be selected from the countersunk shape, the disc shape, the flat round head shape, or the regular polygon according to actual use requirements, so that the threaded fastener can adapt to different working environments.
The implementation principle of the embodiment 1 of the application is as follows: through set up ending changeover portion 3 between screw thread portion 1 and polished rod portion 2, increase the stress area between screw thread portion 1 and polished rod portion 2, make the internal stress between screw thread portion 1 and polished rod portion 2 increase, and the screw thread path of ending changeover portion 3 is the same with screw thread portion 1's screw thread path, the processing degree of difficulty of threaded fastener has been reduced, therefore, the cost is reduced, the structural strength of the same structure reinforcing ending changeover portion 3 of screw thread path simultaneously, thereby reduce the screw thread bottom of a tooth effectively, the crest is because of the cracked risk of threaded fastener that the stress concentration that the breakpoint caused arouses, improve threaded fastener's fatigue resistance, the factor of safety of the use of reinforcing threaded fastener.
Example 2:
referring to fig. 4 and 5, the difference between the present embodiment 2 and the embodiment 1 lies in that the small diameter of the thread of the ending transition section 3 gradually increases along the axial direction of the threaded fastener, specifically, the small diameter of the thread of the ending transition section 3 gradually increases from the polished rod portion 2 of the threaded portion 1, and the ending transition section 3 with the gradually increasing small diameter of the thread enables the threaded portion 1 to smoothly transition to the outer circular surface of the polished rod portion 2, so that the lead of the thread from the complete thread form to the end is reduced, and the stress area is increased at the same time, thereby enhancing the strength of the thread ending part, effectively reducing the risk of fracture of the threaded fastener caused by stress concentration due to the break point at the thread root and the thread crest, improving the fatigue resistance of the threaded fastener, and enhancing the safety factor of the use of the threaded fastener.
The above are all preferred embodiments of the present application, and the present embodiment is only explained for the present application, and the protection scope of the present application is not limited by this, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (5)
1. A thread fastener at the end comprises a thread part (1) and a polished rod part (2), and is characterized in that an end transition section (3) is arranged between the thread part (1) and the polished rod part (2), the end circular arc radius R of the end transition section (3) is more than 0.165P and less than R and less than 0.2P, the length L of the end transition section (3) along the axial direction of the thread fastener is more than L and less than 1.5P, wherein P is thread pitch; the small diameter of the thread of the ending transition section (3) is gradually increased along the axial direction of the threaded fastener and towards the direction of the polished rod part; the axial length of the thread part (1) is greater than that of the ending transition section (3).
2. A final threaded fastener according to claim 1, characterized in that the end of the threaded portion (1) remote from the smooth shank portion (2) is provided with a chamfer (11).
3. A final threaded fastener according to claim 1, characterized in that the profile of the threaded portion (1) is trapezoidal, rectangular, buttress or triangular.
4. A final threaded fastener according to claim 1, characterized by further comprising a nut portion (4), said nut portion (4) being connected to the end of the shank (2) remote from the threaded portion (1), said nut portion (4) being formed integrally with the shank (2).
5. A final threaded fastener according to claim 4, characterized in that the shape of the nut portion (4) is of countersunk, discoidal or regular polygonal shape.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220165225.2U CN217633344U (en) | 2022-01-21 | 2022-01-21 | Ending thread fastener |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220165225.2U CN217633344U (en) | 2022-01-21 | 2022-01-21 | Ending thread fastener |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217633344U true CN217633344U (en) | 2022-10-21 |
Family
ID=83641876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220165225.2U Active CN217633344U (en) | 2022-01-21 | 2022-01-21 | Ending thread fastener |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217633344U (en) |
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2022
- 2022-01-21 CN CN202220165225.2U patent/CN217633344U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A closed threaded fastener Effective date of registration: 20230505 Granted publication date: 20221021 Pledgee: Bank of China Limited by Share Ltd. Foshan branch Pledgor: FOSHAN NANHAI WEIYE HIGH-STRENGTH STANDARD PARTS Co.,Ltd. Registration number: Y2023980039813 |
|
| PC01 | Cancellation of the registration of the contract for pledge of patent right | ||
| PC01 | Cancellation of the registration of the contract for pledge of patent right |
Date of cancellation: 20230517 Granted publication date: 20221021 Pledgee: Bank of China Limited by Share Ltd. Foshan branch Pledgor: FOSHAN NANHAI WEIYE HIGH-STRENGTH STANDARD PARTS Co.,Ltd. Registration number: Y2023980039813 |
|
| PE01 | Entry into force of the registration of the contract for pledge of patent right | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: A closed threaded fastener Effective date of registration: 20230518 Granted publication date: 20221021 Pledgee: Bank of China Limited by Share Ltd. Foshan branch Pledgor: FOSHAN NANHAI WEIYE HIGH-STRENGTH STANDARD PARTS Co.,Ltd. Registration number: Y2023980041033 |