CN203098519U - Bolt with enlarging radius of rounded roof in thread ending position - Google Patents
Bolt with enlarging radius of rounded roof in thread ending position Download PDFInfo
- Publication number
- CN203098519U CN203098519U CN 201320125862 CN201320125862U CN203098519U CN 203098519 U CN203098519 U CN 203098519U CN 201320125862 CN201320125862 CN 201320125862 CN 201320125862 U CN201320125862 U CN 201320125862U CN 203098519 U CN203098519 U CN 203098519U
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- CN
- China
- Prior art keywords
- bolt
- radius
- ending
- thread
- changeover portion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Abstract
The utility model discloses a bolt with an enlarging radius of rounded roof in the thread ending position. The bolt comprises a bolt body, and is characterized in that the radius of rounded roof in the thread ending transition section of the bolt body is larger than that of a thread main body section; a distance of the ending transition section equals to two thread tooth pitches; the bolt minor diameter of the ending transition section is larger than that of the main body section; and the depth of a thread groove of the transition section is reduced gradually. According to the bolt disclosed by the utility model, the radius of rounded roof of the bolt transition position is changed, so that the stress concentration in the bolt transition position is reduced, so that the bolt is prevented from breaking effectively, and the use safety of the bolt is enhanced.
Description
Technical field
Background technique
Now bolt as shown in Figure 1, the requirement of threaded body section be radius of rounded root to be not less than 0.125P(P be tooth apart from).Ending screw thread changeover portion E1 is that end one tooth of screw thread begins to the smooth cylindrical body of bolt.This changeover portion is a screw thread to the place that bar portion stress is concentrated easily, because the stress of screw-thread ending transition position is concentrated, so the bolt easy-rupturing, this problem is difficult to solve always.
Summary of the invention
The purpose of this utility model provides a kind of screw-thread ending place radius of rounded root and becomes big bolt.
To be solved in the utility model is that the screw-thread ending place of existing bolt easily causes stress to concentrate, and produces the problem of fracture, thereby improves product quality, and automobile is protected with the Security of bolt.
The technical solution of the utility model is:
It comprises bolt body, it is characterized in that the radius of rounded root of the screw-thread ending changeover portion of described bolt body
Greater than the radius of rounded root of threaded body section, the distance of ending changeover portion is two teeth, the bolt path of changeover portion greater than the bolt path of main paragraph and
The thread groove degree of depth of changeover portion reduces gradually.
Described ending changeover portion radius of rounded root is 0.140P-0.162P, and P is the tooth distance.
Advantage of the present utility model:
The radius of rounded root at the utility model changeover portion place is enlarged to (0.140P-0.162P) gradually by original (0.125P-0.144P), thereby screw thread is carried out the transition on the outer round surface of polished rod smoothly; Transition length at the bottom of its tooth is begun at the bottom of the screw thread least significant end changes 2 sounds of baby talk from beginning at the bottom of ending 1 sound of baby talk by original bolt, thereby guarantees the slow transition of Bottom of Thread circular arc; And strengthened king-bolt path (height that scabbles at the bottom of the tooth becomes 9 H/32 by original H/4, and H is the tooth height), increased stress plane.Prevent the fracture of bolt effectively, strengthened the safety coefficient that bolt uses.
Description of drawings
Fig. 1 is existing regular screw threads entity tooth form structural representation.
Fig. 2 is the basic profile structural representation of the utility model screw thread.
Fig. 3 is the utility model screw thread entity tooth form structural representation.
Embodiment
The utility model is described in further detail below in conjunction with drawings and the specific embodiments.
As shown in Figures 2 and 3, the utility model comprises bolt body 1, the radius of rounded root of the screw-thread ending changeover portion E2 of described bolt body 1
R2 is greater than the radius of rounded root R3 of threaded body section, and the distance of ending changeover portion E2 is two teeth, the bolt path D2 of changeover portion greater than the bolt path of main paragraph and
Thread groove 2 degree of depth of changeover portion reduce gradually.
Described ending changeover portion E2 radius of rounded root R2 is 0.140P-0.162P, and P is the tooth distance.
The ending of the utility model screw thread apart from E2 than the ending of existing regular screw threads bolt apart from the long tooth of E1 apart from distance, thereby the utility model screw bolt has played slow level and smooth transition on the ending size, reduces bolt forms fracture suddenly because of the ending transition risk; Simultaneously the utility model screw thread is because the increase of ending root radius R2, thereby increased the size of screw thread path D2, increased stress area, prevents that stress from concentrating and the ending place fracture that causes.
Claims (2)
1. a screw-thread ending place radius of rounded root becomes big bolt, comprises bolt body, it is characterized in that the radius of rounded root of the screw-thread ending changeover portion of described bolt body
Greater than the radius of rounded root of threaded body section, the distance of ending changeover portion is two teeth, and the bolt path of changeover portion is greater than the bolt path of main paragraph.
2. screw-thread ending according to claim 1 place radius of rounded root becomes big bolt, it is characterized in that described ending changeover portion radius of rounded root is 0.140P-0.162 P, and P is the tooth distance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320125862 CN203098519U (en) | 2013-03-20 | 2013-03-20 | Bolt with enlarging radius of rounded roof in thread ending position |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320125862 CN203098519U (en) | 2013-03-20 | 2013-03-20 | Bolt with enlarging radius of rounded roof in thread ending position |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203098519U true CN203098519U (en) | 2013-07-31 |
Family
ID=48849924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320125862 Expired - Lifetime CN203098519U (en) | 2013-03-20 | 2013-03-20 | Bolt with enlarging radius of rounded roof in thread ending position |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203098519U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105065410A (en) * | 2015-07-23 | 2015-11-18 | 南通汇能电力科技有限公司 | High-strength bolt for tension control structure |
| CN109236831A (en) * | 2018-10-23 | 2019-01-18 | 航天精工股份有限公司 | A kind of bolt and its transition structure with transition region |
| CN115919396A (en) * | 2023-01-30 | 2023-04-07 | 西安赛德欧医疗研究院有限公司 | Rectum anastomat |
| CN117020570A (en) * | 2023-04-28 | 2023-11-10 | 定西高强度紧固件股份有限公司 | Technological method for improving low-temperature impact and fatigue resistance performance of wind turbine blade stud |
-
2013
- 2013-03-20 CN CN 201320125862 patent/CN203098519U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105065410A (en) * | 2015-07-23 | 2015-11-18 | 南通汇能电力科技有限公司 | High-strength bolt for tension control structure |
| CN109236831A (en) * | 2018-10-23 | 2019-01-18 | 航天精工股份有限公司 | A kind of bolt and its transition structure with transition region |
| CN115919396A (en) * | 2023-01-30 | 2023-04-07 | 西安赛德欧医疗研究院有限公司 | Rectum anastomat |
| CN117020570A (en) * | 2023-04-28 | 2023-11-10 | 定西高强度紧固件股份有限公司 | Technological method for improving low-temperature impact and fatigue resistance performance of wind turbine blade stud |
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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 |
Granted publication date: 20130731 |
|
| CX01 | Expiry of patent term |