CN201224849Y - Screw thread connection structure for high fatigue strength steel rail - Google Patents
Screw thread connection structure for high fatigue strength steel rail Download PDFInfo
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- CN201224849Y CN201224849Y CNU2008200749621U CN200820074962U CN201224849Y CN 201224849 Y CN201224849 Y CN 201224849Y CN U2008200749621 U CNU2008200749621 U CN U2008200749621U CN 200820074962 U CN200820074962 U CN 200820074962U CN 201224849 Y CN201224849 Y CN 201224849Y
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- fatigue strength
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- hexagon
- thread
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Abstract
The utility model relates to a thread connecting structure used for a high fatigue strength steel rail, which comprises a bolt and a nut, wherein the bolt is a hexagonal head bolt, the thread section of the bolt is manufactured on a coaxial column table at the lower part, and the but screwed with the bolt is a frustum-shaped nut. The thread connecting structure breaks through the traditional steel rail thread connecting and installing form, the frustum-shaped nut and the hexagonal head bolt are installed in a ceiling mounting way, therefore, the phenomenon of axial stress concentration of the bolt can be remarkably improved, and the fatigue strength and the service life of the hexagonal head bolt used for the steel rail are respectively enhanced and prolonged to a larger extent; and since the diameter of the non-thread section of the hexagonal head bolt is reduced, the anti-impact capability under vibration can be further improved on the basis of the high fatigue strength, the security and the steadiness for connection between the railway steel rail and a sleeper are ensured, and the incidence rate of the accidents of railroad transportation is reduced.
Description
Technical field
The utility model belongs to the machine components field, particularly a kind of high-fatigue strength rail thread joined structure.
Background technology
Threaded connection mode is the most widely used connecting mode in plant equipment, engineering structures, automobile, the railway, and it has advantages such as linking intensity height, simple in structure, easy accessibility, adjustment be easy.Particularly aspect railway transportation, the bolt and nut connecting mode is adopted in connecting between rail and the sleeper more, bolt is the most key coupling components, and its intensity directly influences safety and the reliability that rail connects with sleeper, and then influences the safety of locomotive operation.Continuous development along with the China Railway industry, the situation that it has formed high density gradually, macro-axis is heavy and develop simultaneously at a high speed, speed and axle improve in the time of heavy, the load of rail is also constantly increased, thereby aggravated the destruction to bolt, this has higher requirement to the functional performance of bolt and the draw bail of bolt and nut undoubtedly.
The bolt and nut draw bail that is adopted between rail and the sleeper is at present: bolt vertically is installed on the sleeper, the end of thread exposes to crosstie surface, suit can be pressed in the buckle and the spring of rail lower edge one side successively on bolt, nut screws the bolt end that is tightened against spring top, by compressing spring buckle is pressed in the rail lower edge, to realize that rail connects with the firm of sleeper, referring to Fig. 4.The structure of existing bolt and nut and connecting mode thereof exist certain drawback: at first, the suffered external force of rail directly is passed to nut by shell fragment, therefore bolt is when bearing axial force, its stress mainly concentrates on the screw thread place that screws part with nut, cause herein tensile stress and flexural stress bigger, very easily cause the fatigue damage of bolt, reduce its application life; And existing rail also aggravates concentrating of bolt axial stress to a certain extent with the nut of regular shape; In addition, existing rail bolt is the assurance linking intensity, and its diameter is generally bigger, causes its rigidity bigger, and the anti-vibration impact property is relatively poor, does the time spent and very easily causes fatigue damage bearing a cyclic loading.
Summary of the invention
The purpose of this utility model is to overcome the deficiencies in the prior art, and a kind of high-fatigue strength rail thread joined structure is provided, and it can effectively reduce bolt stress concentrates, and improves the bolt fatigue strength and the purpose in application life thereby reach.
The utility model solves its technical problem and is achieved through the following technical solutions:
A kind of high-fatigue strength rail thread joined structure is made of bolt and nut, it is characterized in that: bolt be hexagon-headed bolt and its thread segment on the coaxial pylon of bottom, be positive taper type nut with the nut that this bolt screws mutually.
In addition, described positive taper type nut tapering is 5.50 °～9.50 °.
In addition, this positive taper type nut bottom one is shaped on plinth.
In addition, non-threaded section diameter of described hexagon-headed bolt is 0.6～0.9d, and d is the bolt nominal diameter.
Advantage of the present utility model and beneficial effect are:
1. the application finite element method carries out contact analysis to traditional rail thread joined structure and the utility model thread joined structure, and the result shows:
Bolt is when being subjected to responsive to axial force in the tradition rail thread joined structure, and its stress mainly concentrates on the screw thread place that screws contact portion with nut, and each tooth of screw thread is stressed very inhomogeneous.Experiment showed, 1/3rd load concentration on the screw thread contact portion first lap of bolt head, and it is stressed hardly after the 8th circle to be that screw thread withdraws from the ridge of end, causes bolt strained unreasonablely, very easily cause the fatigue damage of bolt.
Adopt in this thread joined structure positive taper type nut is fixed in sleeper, the mounting means of hexagon-headed bolt in top screws positive taper type nut connects packing ring, spring, buckle, just the contact portion of bolts and nuts in the common rail thread connection is transferred to the bottom, be the inverted connecting mode of a kind of nut, changed above-mentioned irrational force phenomenon that is subjected to.Hexagon-headed bolt screws contact portion away from the distributed load acting surface with positive taper type nut, the non-threaded section diameter at hexagon-headed bolt middle part is less than the nominal diameter of screw thread, better flexible, tensile load there is certain consumption, can make the tensile stress and the local flexural stress that screw the ridge place less, thereby significantly improve hexagon-headed bolt axial stress concentration phenomenon, improved the fatigue strength and the application life of hexagon-headed bolt to a great extent.
2. application finite element method, in the thread joined structure that adopts traditional rule shape nut and the utility model just taper type nut and hexagon-headed bolt draw bail carry out contact analysis, the result shows:
Contact analysis to the thread joined structure that adopts traditional rule shape nut, the tension fatigue failure 60%～65% of bolt as can be seen occurs in the root of first lap screw thread that screws part of bolts and nuts, and 20%～25% part that withdraws from that occurs in screw thread is arranged; And do not have under the ruined condition at whole connector metal streamline, bolt is without before strengthening, more than the probability of tension fatigue failure in two places be respectively 65% and 20%.
Positive taper type nut and hexagon-headed bolt mounting means in this thread joined structure are carried out contact analysis, can draw: positive taper type outer surface tapering is when 5.50 °～9.50 ° scopes, the thread root maximum stress of bolt has clear improvement, contact site thread root distribution curve of stress is comparatively level and smooth, axially maximum stress reduces by 15.74% when plain nut connects, stress distribution is more reasonable, therefore can effectively improve bolt fatigue strength.Be square with positive taper type nut base shaped design simultaneously, rotate, be more convenient for being fixed to increase the stability of thread connection to prevent its circumference.
3. the hexagon-headed bolt that this thread joined structure adopted, non-threaded section diameter of hexagon-headed bolt is 0.6～0.9 times bolt nominal diameter.
Hexagon-headed bolt need have certain flexibility for coupled of rigidity.When fatigue failure was the hexagon-headed bolt main failure forms, the flexibility that increases bolt can increase its deflection, helps it and bears vibratory impulse; Simultaneously can bear a cyclic loading and do the time spent, lower the stress amplitude of varying stress, symmetrical load stress distribution, thereby the fatigue strength and the application life of improving bolt at hexagon-headed bolt.
Therefore, high-fatigue strength rail thread joined structure of the present utility model, break through traditional rail thread joined structure form, adopt positive taper type nut and hexagon-headed bolt to be inverted the form of installing, and this connection form is designed positive taper type nut, the two has improved the fatigue strength and the application life of rail usefulness hexagon-headed bolt to a great extent in conjunction with can significantly improving hexagon-headed bolt axial stress concentration phenomenon; Adopt the mode of the non-threaded section diameter that reduces hexagon-headed bolt simultaneously, make it have certain flexibility on basis of high-fatigue strength having, further improve it and bear the ability of vibratory impulse, thereby guarantee safety, steadiness that railway track connects with sleeper, reduce the railway transportation accident rate.
Description of drawings
Fig. 1 is the utility model assembling drawing (sectional view);
Fig. 2 is the utility model hexagon-headed bolt structural representation;
Fig. 3 is that the utility model is installed and used structural representation;
Fig. 4 is a rail thread joined structure schematic diagram in the prior art.
The specific embodiment
The utility model is described in further detail below by specific embodiment, and following examples are descriptive, is not determinate, can not limit protection domain of the present utility model with this.
This high-fatigue strength rail thread joined structure is made of bolt and nut, and its innovative point is: bolt is hexagon-headed bolt (number in the figure 1), and the thread segment system of this bolt (number in the figure 6) is on the coaxial pylon of bottom.The diameter of non-threaded section (number in the figure 4) of hexagon-headed bolt is less than the nominal diameter of bolt, and it is 0.6～0.9 times of bolt nominal diameter.Each parameter values of hexagon-headed bolt in the present embodiment is: the bolt nominal diameter is 24mm; The footpath is 22.051mm in the bolt; The screw thread path of bolt is 20mm; Non-threaded section diameter span of bolt can be preferably 15mm～20mm, and value is 18mm in the present embodiment; Pitch is 3mm; Bolt length is 72mm; The full thread length of bolt is 28mm.With the nut that hexagon-headed bolt screws mutually is positive taper type nut (number in the figure 2).The tapering β of this positive taper type nut is 5.50 °～9.5 °.Be the connect fastness of assurance nut with sleeper, the bottom one of positive taper type nut is shaped on plinth (number in the figure 3).The system screwed hole can also can be the blind hole form for through-hole form in the positive taper type nut.Hexagon-headed bolt with the mounting means that connects of positive taper type nut is: positive taper type nut is fixed in the sleeper (number in the figure 11), hexagon-headed bolt is in the top screws positive taper type nut, install pad (number in the figure 8), spring (number in the figure 9), buckle (number in the figure 10) successively, rail (number in the figure 12) is connected with sleeper is firm by shell fragment and buckle.The rail opposite side has the draw bail of symmetry therewith.Adopt hexagon-headed bolt and positive taper type nut inversion type connecting mode, be different from traditional rail threaded connection mode.
Through its contact analysis of finite element modelling, draw and adopt a hexagon-headed bolt and a traditional rule shape nut to be inverted its contact site thread root axial stress distribution when installing, and connect form with conventional threads and compare, the result is as shown in table 1.Each bolt contact site screw position 1～9th contacts the position of screw thread first lap (number in the figure is 5) to the 9th circle (number in the figure is 7) from screwing with nut of hexagon-headed bolt cephalad direction number.
Table 1 bolt contact site thread root axial stress chorologic unit: MPa
As seen, in improving rear thread draw bail mode, after soon the hex bolt and nut installation site will be exchanged, because hex bolt and nut screws contact portion away from the distributed load acting surface, non-threaded section of bolt middle part has certain consumption to tensile load, thereby make the tensile stress and the local flexural stress that screw the ridge place less, improve bolt axial stress concentration phenomenon, therefore corresponding fatigue strength and application life of also having improved hexagon-headed bolt.
In addition, through its contact analysis of finite element modelling, draw its contact site thread root axial stress distribution when hexagon-headed bolt connects with positive taper type nut in the utility model, and compare with Bolt Connection with traditional rule shape nut, the result is as shown in table 2.Contact site screw position 1～9th screws screw thread first lap to the nine circles that contact from hexagon-headed bolt cephalad direction number and nut.
Table 2 bolt contact site thread root axial stress chorologic unit: MPa
As seen, the thread root maximum stress of hexagon-headed bolt has clear improvement, and each thread root stress distribution of contact site is comparatively average, and axially maximum stress reduces by 15.74% when conventional nut connects, stress distribution is more reasonable, therefore can effectively improve hexagon-headed bolt fatigue strength.
Show through above-mentioned finite element modelling contact analysis result, at first when adopting the inverted draw bail of bolt and nut, promptly only hexagon-headed bolt and plain nut position are exchanged, analytical structure is inverted the influence that the bolt axial stress is concentrated, compare by connecting form with conventional threads, show that by table 1 result bolt axial stress concentration phenomenon obtains improvement to a certain degree, therefore also corresponding fatigue strength and application life of having improved hexagon-headed bolt.Secondly when adopting high-fatigue strength rail thread joined structure of the present utility model, promptly by adopting positive taper type nut and hexagon-headed bolt to be inverted the form of installing, hexagon-headed bolt axial stress concentration phenomenon be can significantly improve, fatigue strength and application life that rail is used hexagon-headed bolt increased substantially; And, adopting on the basis of above-mentioned connecting mode the thin bar of the diameter of non-threaded section of hexagon-headed bolt being made less than the screw thread nominal diameter, reach the purpose that on the basis that guarantees linking intensity, has certain flexibility, thereby improve the ability that it bears vibratory impulse, guaranteeing safety, steadiness that railway track connects with sleeper, is a kind of rail thread joined structure that has than high innovation character.
Claims (4)
1. a high-fatigue strength rail thread joined structure is made of bolt and nut, it is characterized in that: bolt be hexagon-headed bolt and its thread segment on the coaxial pylon of bottom, be positive taper type nut with the nut that this bolt screws mutually.
2. high-fatigue strength rail thread joined structure according to claim 1 is characterized in that: described positive taper type nut tapering is 5.50 °～9.50 °.
3. high-fatigue strength rail thread joined structure according to claim 1 and 2 is characterized in that: this positive taper type nut bottom one is shaped on plinth.
4. high-fatigue strength rail thread joined structure according to claim 1 is characterized in that: non-threaded section diameter of described hexagon-headed bolt is 0.6～0.9d, and d is the bolt nominal diameter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200749621U CN201224849Y (en) | 2008-06-05 | 2008-06-05 | Screw thread connection structure for high fatigue strength steel rail |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200749621U CN201224849Y (en) | 2008-06-05 | 2008-06-05 | Screw thread connection structure for high fatigue strength steel rail |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201224849Y true CN201224849Y (en) | 2009-04-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008200749621U Expired - Fee Related CN201224849Y (en) | 2008-06-05 | 2008-06-05 | Screw thread connection structure for high fatigue strength steel rail |
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| Country | Link |
|---|---|
| CN (1) | CN201224849Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911920A (en) * | 2014-04-21 | 2014-07-09 | 江苏海迅铁路器材集团股份有限公司 | Wood sleeper used for meter-gauge rails |
| CN104208732A (en) * | 2014-09-16 | 2014-12-17 | 张家港市欧思瑞科技有限公司 | Detachable sterilization vehicle track for sterilization cabinet |
-
2008
- 2008-06-05 CN CNU2008200749621U patent/CN201224849Y/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103911920A (en) * | 2014-04-21 | 2014-07-09 | 江苏海迅铁路器材集团股份有限公司 | Wood sleeper used for meter-gauge rails |
| CN104208732A (en) * | 2014-09-16 | 2014-12-17 | 张家港市欧思瑞科技有限公司 | Detachable sterilization vehicle track for sterilization cabinet |
| CN104208732B (en) * | 2014-09-16 | 2016-11-23 | 张家港市欧思瑞科技有限公司 | A kind of detachable vehicle of sterilization track of sterilizing cabinet |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090422 Termination date: 20100605 |