CN202768586U - Bolt for automobile fastening - Google Patents
Bolt for automobile fastening Download PDFInfo
- Publication number
- CN202768586U CN202768586U CN 201220408950 CN201220408950U CN202768586U CN 202768586 U CN202768586 U CN 202768586U CN 201220408950 CN201220408950 CN 201220408950 CN 201220408950 U CN201220408950 U CN 201220408950U CN 202768586 U CN202768586 U CN 202768586U
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- Prior art keywords
- bolt
- screw rod
- screw
- teeth
- thread
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Abstract
The utility model discloses a bolt for automobile fastening. The bolt for automobile fastening is even in stressing on threads and high in fatigue strength of the threads. The bolt comprises a bolt head portion and a screw. The tooth top shape of an upper tooth of the thread section of the screw is an arc shape. The tooth top arc angle of the upper tooth of a first circle of thread section at the connecting end of the screw and the bolt head portion is larger than the tooth top arc angle of upper teeth of other thread sections of the screw. The bolt for automobile fastening has the advantages that the threads on the screw of the bolt are stressed evenly, the fatigue strength of the threads on the screw of the bolt is improved, and the service life of the bolt is prolonged.
Description
Technical field
The utility model relates to a kind of bolt, refers in particular to a kind of bolt for fastening automobile.
Background technique
Mechanical parts, such as axle, gear, bearing, blade, spring etc., the at any time intercropping of the stress of each point periodically changes in the course of the work, and the periodically variable stress of this at any time intercropping is called alternating stress (also claiming cyclic stress).Under the effect of alternating stress, although the stress that part bears is lower than the yield point of material, be called the fatigue of metal through the phenomenon that cracks after the work of long period or occur suddenly to rupture fully.Fatigue strength refers to metallic material under alternate load effect infinitely repeatedly and non-destructive maximum stress is called fatigue strength or fatigue limit.Now widely used scyewed joint fastening piece because under vibration and varying load etc. act on, easily causes the fastening piece phenomenon that gets loose, and studies carefully the screw thread discontinuity that its main cause is bolt itself, causes the screw thread fatigue strength of bolt not high.
Chinese patent notice of authorization number: CN 202273960U, June 13 2012 notice of authorization day, a kind of high-strength bolt is disclosed, comprise the reinforcement structure that the outside nonmetal body of bolt and ferrule, metallic rod form, be provided with ferrule in the head screwing of nonmetal bolt one end, be provided with metallic rod in the middle part polished rod of nonmetal bolt and the outside thread of opposite side, the screw head, polished rod, outside thread of described nonmetal bolt are the ferrule that forms of the composition of phenolic resin and high-strength structureal adhesives, the full inclusion of metallic rod.Deficiency of the present utility model is, this high-strength bolt has been transformed the structure of bolt inside, so that the preparation process more complicated, is still common worm structure and outside thread adopts, so that the phenomenon of screw thread discontinuity still exists, cause the screw thread fatigue strength of bolt not high.
The model utility content
The utility model is in order to overcome high-strength bolt screw thread discontinuity in the prior art, deficiency that screw thread fatigue strength is not high, the bolt that is used for fastening automobile that a kind of screw thread is stressed more evenly, screw thread fatigue strength is higher to be provided.
To achieve these goals, the utility model is by the following technical solutions:
A kind of bolt for fastening automobile, comprise bolt head and screw rod, the tooth top of teeth is shaped as circular-arcly on the described screw flight cross section, and the top circle arc angle of teeth is greater than the top circle arc angle of teeth on all the other thread segment of screw rod on the first lap thread segment of described screw rod and bolt head connecting end.
Enter adversary's part when fastening screwing, because the tooth top of teeth is shaped as circular-arc so that screw thread is stressed more even on the screw flight cross section, has reduced the risk that stress concentration point produces, thereby improved screw thread fatigue strength.Design only needs to change the top circle arc angle of teeth on the screw flight cross section like this, just can reach the purpose that screw thread is stressed more evenly, improve screw thread fatigue strength.
As preferably, the height of teeth is less than the height of teeth on all the other thread segment of screw rod on the first lap thread segment of described screw rod and bolt head connecting end, like this design be because bolt screw enter adversary's part when fastening the first lap screw thread of screw rod and bolt head connecting end stressed larger, so height of teeth on the first lap thread segment of reduction screw rod and bolt head connecting end, so that screw thread is stressed more even, reduced the risk that stress concentration point produces, thereby can effectively improve the fatigue strength of screw thread, improve the working life of bolt.
As preferably, tooth Bottom Shape on the described screw flight cross section between the adjacent teeth is circular shape, design is so that stressed more even between the adjacent thread like this, reduced the risk that the tooth bottom stress centrostigma between the adjacent teeth produces on the screw flight cross section, be convenient to the dispersion of the suffered power of screw thread on screw rod, effectively raise the intensity of screw thread on the screw rod, further improved the fatigue strength of screw thread.
As preferably, arc angle equals the top circle arc angle of teeth on all the other thread segment of screw rod at the bottom of the tooth that forms between the adjacent teeth on all the other thread segment of described screw rod, the fastening of bolt and adversary's part is convenient in design like this, simultaneously so that the distribution of force between the screw thread is even, reduced the risk that the screw thread stress concentration point on the screw rod produces, be not easy to the damage of screw thread on the bolt, improved the fatigue strength of screw thread.
The beneficial effects of the utility model are: screw thread is stressed more even on the screw rod of bolt, has reduced the risk that the screw thread stress concentration point produces on the screw rod of bolt, has improved screw thread fatigue strength on the screw rod of bolt, the working life of having improved bolt.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model.
Among the figure: 1. bolt head, 2. screw rod, 3. first lap screw thread.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is further described.
Embodiment one: among the embodiment as described in Figure 1, a kind of bolt for fastening automobile, comprise bolt head 1 and screw rod 2, the tooth top of teeth is shaped as circular-arcly on the thread segment of described screw rod 2, and the top circle arc angle of teeth is greater than the top circle arc angle of teeth on screw rod 2 all the other thread segment on first lap screw thread 3 cross sections of described screw rod 2 and bolt head 1 connecting end.The height of teeth is less than the height of teeth on screw rod 2 all the other thread segment on first lap screw thread 3 cross sections of described screw rod 2 and bolt head 1 connecting end.Tooth Bottom Shape on the thread segment of described screw rod 2 between the adjacent teeth is circular shape.Arc angle equals the top circle arc angle of teeth on screw rod 2 all the other thread segment at the bottom of the tooth that forms between the adjacent teeth on all the other thread segment of described screw rod 2.Radius of arc is 0.5-1.5mm at the bottom of the tooth on the thread segment of described screw rod 2 between the adjacent teeth, and the tooth top radius of arc of teeth is 0.5-1.5mm on the thread segment of described screw rod 2.
Screwing when entering adversary's part, because the tooth return pulley profile on the thread segment of screw rod 2 between the adjacent teeth is round and smooth camber line, so that screw thread is stressed more even, has reduced the risk that the screw thread stress concentration point on the screw rod 2 produces, thereby improved screw thread fatigue strength.Because bolt screw enter adversary's part when fastening screw rod 2 stressed larger with the first lap screw thread 3 of bolt head 1 connecting end, and on first lap screw thread 3 cross sections of screw rod 2 and bolt head 1 connecting end the height of teeth less than the height of teeth on screw rod 2 all the other thread segment, so height of teeth on first lap screw thread 3 cross sections of reduction screw rod 2 and bolt head 1 connecting end, so that screw thread is stressed more even, reduced the risk that stress concentration point produces, thereby can effectively improve the fatigue strength of screw thread, improve the working life of bolt.
Claims (4)
1. bolt that is used for fastening automobile, comprise bolt head (1) and screw rod (2), it is characterized in that, the tooth top of teeth is shaped as circular-arcly on the thread segment of described screw rod (2), and the top circle arc angle of teeth is greater than the top circle arc angle of teeth on all the other thread segment of screw rod (2) on first lap screw thread (3) cross section of described screw rod (2) and bolt head (1) connecting end.
2. a kind of bolt for fastening automobile according to claim 1 is characterized in that, the height of teeth is less than the height of teeth on all the other thread segment of screw rod (2) on first lap screw thread (3) cross section of described screw rod (2) and bolt head (1) connecting end.
3. a kind of bolt for fastening automobile according to claim 1 and 2 is characterized in that, the tooth Bottom Shape on the thread segment of described screw rod (2) between the adjacent teeth is circular shape.
4. a kind of bolt for fastening automobile according to claim 1 and 2, it is characterized in that arc angle equals the top circle arc angle of teeth on all the other thread segment of screw rod (2) at the bottom of the tooth that forms between the adjacent teeth on all the other thread segment of described screw rod (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220408950 CN202768586U (en) | 2012-08-17 | 2012-08-17 | Bolt for automobile fastening |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220408950 CN202768586U (en) | 2012-08-17 | 2012-08-17 | Bolt for automobile fastening |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202768586U true CN202768586U (en) | 2013-03-06 |
Family
ID=47775165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220408950 Expired - Lifetime CN202768586U (en) | 2012-08-17 | 2012-08-17 | Bolt for automobile fastening |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202768586U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344897A (en) * | 2015-11-27 | 2016-02-24 | 宁波敏达机电有限公司 | Bolt with spiral cylindrical surface and processing dental plate for bolt |
-
2012
- 2012-08-17 CN CN 201220408950 patent/CN202768586U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105344897A (en) * | 2015-11-27 | 2016-02-24 | 宁波敏达机电有限公司 | Bolt with spiral cylindrical surface and processing dental plate for bolt |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 315821 No. 98, Jiangnan Middle Road, Beilun District, Ningbo City, Zhejiang Province Patentee after: Ningbo Minda Automobile Technology Co.,Ltd. Address before: 315821 No. 98, Jiangnan Middle Road, Beilun District, Ningbo City, Zhejiang Province Patentee before: NINGBO ZHENHAI MINDA ELECTROMECHANICAL CO.,LTD. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130306 |