CN203272383U - Anti-crack screw - Google Patents
Anti-crack screw Download PDFInfo
- Publication number
- CN203272383U CN203272383U CN 201320333937 CN201320333937U CN203272383U CN 203272383 U CN203272383 U CN 203272383U CN 201320333937 CN201320333937 CN 201320333937 CN 201320333937 U CN201320333937 U CN 201320333937U CN 203272383 U CN203272383 U CN 203272383U
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- thread
- screw
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- stress
- threads
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Abstract
The utility model relates to an anti-crack screw. The anti-crack screw comprises a cap part and a rod part, wherein the rod part comprises a thread region and a non-thread region. The anti-crack screw is characterized in that multiple circles of threads, bordering the non-thread region, of the thread region are gradually shrunken threads. According to the anti-crack screw, the threads bordering the non-thread region are designed into the gradually shrunken threads, the degrees of top angles of the threads are increased, and the non-thread region is engaged with the root of a first thread of the thread region in a gradually shrunken manner, so that the intensity of the stress acting on a stress concentration point of the screw is reduced, the stress is uniformly distributed at each part of the screw, the life of the screw is prolonged, and the cracking of the screw at the stress concentration point is prevented.
Description
Technical field
The utility model relates to a kind of screw, is specifically related to a kind of anti-fracture screw.
Background technique
Existing screw is comprised of cap section and bar section the non-thread district that is divided into the thread district that is provided with thread in bar section and there is no thread as shown in Figure 1 usually.When with this screw fixation workpiece, most of stress will concentrate on threaded area the crest place with a small amount of screw thread of non-threaded district intersection, generally this zone will be called stress concentration point.For effect guarantee to be installed, can be generally acute angle with the angle design of thread crest, cause as the region area of stress concentration point minimum, screw when work very easily in the stress concentration point fracture and scrap.
Summary of the invention
In view of this, the utility model discloses and a kind ofly reduces that stress concentration point is stressed, the screw of easy-rupturing not.
The purpose of this utility model is achieved through the following technical solutions: a kind of anti-fracture screw, comprise cap section and bar section, and described bar section comprises thread district and non-thread district, a few threads that described thread district and non-thread district have a common boundary are the convergent thread.
The large footpath of convergent thread dwindles gradually along past non-thread district, thread district direction, and namely the closer to non-thread district, the large footpath of thread is less.Can reduce by this method thread district and non-thread district intersection as a few threads of stress concentration point and the tightness of workpiece, thereby reduce the suffered stress of stress concentration point, the eliminate stress effect of centrostigma makes stress shift to screw other positions, and screw is easy-rupturing not.
At the bottom of the tooth of described non-thread district and first thread in thread district, convergent is connected.
At the bottom of the tooth of non-thread district and first thread in thread district, convergent is connected, and can further reduce the suffered stress of stress concentration point, and the centrostigma that namely further eliminates stress makes stress equilibrium put on bar section.
Further, its crest angle of described convergent thread is 90 °-180 °.
The angle that enlarges the thread crest is conducive to increase the lifting surface area of crest, and the stress that is applied on screw is further disperseed.
Further, the number of turns of described convergent thread is greater than thread district thread number of total coils 1/4.
The utility model will be by being designed to the convergent thread, increasing thread drift angle angle, making suffered stress intensity on the method reduction screw stress concentration point that convergent is connected at the bottom of the tooth of non-thread district and first thread in thread district in the thread that non-thread district has a common boundary, make stress be evenly distributed in screw each position, improved the life-span of screw, prevented that screw is in stress concentration point place's fracture.
Description of drawings
Fig. 1 is a kind of embodiment's of screw of the present utility model structural representation.
Fig. 2 is the anti-fracture screw thread district of the utility model shown in Fig. 1 and non-threaded district intersection enlarged view.
Fig. 3 is the working state schematic representation of the anti-fracture screw of the utility model shown in Figure 1.
Embodiment
For the ease of it will be appreciated by those skilled in the art that below in conjunction with accompanying drawing and embodiment, the utility model is described in further detail:
As Fig. 1 to Fig. 3, anti-fracture screw 1 comprises cap section 11 and bar section 12, and bar section 12 comprises thread district 122 and non-thread district 121, and thread district 122 has 20 circle threads, and have a common boundary 123 5 circle threads 1221 of thread district 122 and non-thread district 121 are the convergent thread.
The large footpath of convergent thread 122 dwindles toward non-thread district 121 directions gradually along the thread district, and namely the closer to non-thread district 121, the large footpath of thread is less.Can reduce by this method thread district 122 and the tightnesss of non-thread district 121 intersections 123 as 5 circle threads 1221 with the workpiece 14 of stress concentration point, thereby reduce the suffered stress of stress concentration point, the effect of centrostigma eliminates stress, make stress to other positions transfers of screw, screw is easy-rupturing not.
At the bottom of the tooth of described non-thread district 121 and first thread in thread district 122, convergent is connected.
At the bottom of the tooth of non-thread district 121 and first thread in thread district 122,1222 convergents are connected, and can further reduce the suffered stress of stress concentration point, and the centrostigma that namely further eliminates stress makes stress equilibrium put on bar section 12.
Further, convergent thread 1221 its crest angles are 120 °, increase the lifting surface area of crest, and the stress that is applied on screw is further disperseed.
The working state of anti-fracture screw 1: anti-fracture screw 1 is fixed on parts 14 by thread district 122 threads, and gripping members 15 by this.At this moment, reduce the characteristic of screwed tooth structure due to anti-fracture screw, screw stressed can be evenly distributed on each thread in thread district 122, strengthen the intensity of anti-fracture screw.
Be more than wherein specific implementation of the present utility model, it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.Should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these apparent replacement forms all belong to protection domain of the present utility model.
Claims (4)
1. anti-fracture screw comprises cap section and bar section, and described bar section comprises thread district and non-thread district, it is characterized in that: a few threads that described thread district and non-thread district have a common boundary are the convergent thread.
2. anti-fracture screw according to claim 1 is characterized in that: at the bottom of the tooth of described non-thread district and first thread in thread district, convergent is connected.
3. anti-fracture screw according to claim 1 and 2, it is characterized in that: its crest angle of described convergent thread is 90 °-180 °.
4. anti-fracture screw according to claim 3 is characterized in that: the number of turns of described convergent thread is greater than thread district thread number of total coils 1/5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320333937 CN203272383U (en) | 2013-06-09 | 2013-06-09 | Anti-crack screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320333937 CN203272383U (en) | 2013-06-09 | 2013-06-09 | Anti-crack screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203272383U true CN203272383U (en) | 2013-11-06 |
Family
ID=49502805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320333937 Expired - Lifetime CN203272383U (en) | 2013-06-09 | 2013-06-09 | Anti-crack screw |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203272383U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402122A (en) * | 2016-10-27 | 2017-02-15 | 宁波长华长盛汽车零部件有限公司 | Gradient thread achieving automatic guide |
-
2013
- 2013-06-09 CN CN 201320333937 patent/CN203272383U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106402122A (en) * | 2016-10-27 | 2017-02-15 | 宁波长华长盛汽车零部件有限公司 | Gradient thread achieving automatic guide |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20131106 |