CN202301390U - Loosing-preventing double-screw bolt - Google Patents
Loosing-preventing double-screw bolt Download PDFInfo
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- CN202301390U CN202301390U CN2011203875280U CN201120387528U CN202301390U CN 202301390 U CN202301390 U CN 202301390U CN 2011203875280 U CN2011203875280 U CN 2011203875280U CN 201120387528 U CN201120387528 U CN 201120387528U CN 202301390 U CN202301390 U CN 202301390U
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- screw bolt
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- columnar part
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- 238000003466 welding Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 description 6
- 230000007812 deficiency Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000005242 forging Methods 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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Abstract
The utility model provides a loosing-preventing double-screw bolt, comprising a double-screw bolt body and a columnar part, wherein the double-screw bolt body comprises two ends provided with external threads, one end is screwed into a threaded hole, the columnar part axially extends from one end of the columnar part which is screwed into the threaded hole, radial dimension of the columnar part is less than minor diameter of the double-screw bolt, sum of the length of the columnar part and the lengths of the external threads on the ends is more than the depth of a bottom hole of the threaded hole. When axial pretightening force provided by tightening a nut is insufficient or completely disappears, the loosing-preventing double-screw bolt provided by the utility model still has certain pretightening force, thus the double-screw bolt is prevented from getting loose.
Description
Technical field
The utility model relates to double-screw bolt, relates in particular to a kind of locking double-screw bolt.
Background technique
So-called double-screw bolt is also claimed stud, is meant that two ends have externally threaded one type of fastening piece.During connection, an end of double-screw bolt screws in and has in the workpiece of interior threaded hole, and the other end screws on nut after passing the workpiece that has through hole, thereby above-mentioned two workpiece are tightened together.This connection form is called double-screw bolt and connects, and belongs to dismountable scyewed joint.Double-screw bolt is usually used in being connected that one of workpiece thickness is big, claimed structure is compact, or because of dismantling the occasion that frequently should not adopt Bolt Connection.
Double-screw bolt of the prior art and connection form thereof are as shown in Figure 1.During connection, at first an end of double-screw bolt 2 is passed workpiece 3 by the through hole of workpiece 3, screw in the interior threaded hole of workpiece 4 nut 1 of screwing again at last again.This screwing is called pretension, its objective is the rigidity, the tightness that increase to connect, get loose with what prevent to connect, and the suffered axial tension of double-screw bolt is called axial pre tightening force during pretension.Under the effect of axial pre tightening force F, double-screw bolt 2 and being threaded between the workpiece 4 in hole, and produce frictional force between double-screw bolt 2 and the nut 1 and guarantee the reliability that connects, and the size of this frictional force is directly proportional with the axial pre tightening force F that receives.This shows that the reliability that this moment, double-screw bolt connected depends primarily on axial pre tightening force F.
At this moment, the axial pre tightening force F that born of double-screw bolt 2 is only provided by the nut 1 of screwing.Therefore, when needs remove to connect, screw out or when unscrewing nut 1, perhaps nut 1 receives effect such as extraneous vibration, impact, varying load or temperature variation and self takes place loosening or when getting loose, and axial pre tightening force F can reduce until being zero gradually.At this moment, the frictional force f between the outside thread of the double-screw bolt 2 in the workpiece 4 and the internal thread of tapped hole also can be decreased to zero thereupon gradually, also is the state that scyewed joint between double-screw bolt 1 and the workpiece 4 is in no pretension.This just means that also double-screw bolt 2 will screw out at an easy rate from the interior threaded hole of workpiece 4, for example double-screw bolt 2 is also screwed out when screwing out nut 1, and this usually hopes to be avoided.
On the other hand; The internal thread of workpiece 4 upper screwed holes and the outside thread of double-screw bolt 2 produce frictional force f under the effect of axial pre tightening force F; And connecting the frictional force f except between the outside thread of its internal thread and double-screw bolt 2 between nut 1 and the double-screw bolt 2, nut 1 also produces frictional force f ' with its supporting surface.Therefore, when receiving when vibrating, workpiece 4 is compared with the scyewed joint between nut 1 and the double-screw bolt 2 with the scyewed joint between the double-screw bolt 2, is more prone to loosening.
Therefore, when those skilled in the art was devoted to develop a kind of axial pre tightening force deficiency that nut provided when screwing or complete obiteration, self still can have the locking double-screw bolt of certain pretightening force.
The model utility content
Because the above-mentioned defective of existing technology when the utility model technical problem to be solved provides a kind of axial pre tightening force deficiency that nut provided when screwing or complete obiteration, self still has the locking double-screw bolt of certain pretightening force.
For realizing above-mentioned purpose, the utility model provides a kind of locking double-screw bolt, comprises the double-screw bolt body; This double-screw bolt body comprises and has externally threaded two ends; Wherein an end supplies to screw in the tapped hole, and this locking double-screw bolt also comprises columnar part, and this columnar part screws on the end in the tapped hole from it and extends axially; The radial dimension of this columnar part is less than the Bottom of Thread diameter of said double-screw bolt, the externally threaded length sum on the length of columnar part and this end greater than the hole of tapped hole at the bottom of the degree of depth.
In an embodiment of the utility model, this columnar part is coaxial with this double-screw bolt body.
In another embodiment of the utility model, this columnar part is cylinder or prism.
In another embodiment of the utility model, this columnar part be with the double-screw bolt body be integrated.
In another embodiment of the utility model, the end of this columnar part is provided with chamfering or rounding.
In another embodiment of the utility model, the end of this columnar part is sphere, taper, frustoconic shape or taper type.
In another embodiment of the utility model, this columnar part is a pressure spring.
In another embodiment of the utility model, this columnar part is a pressure spring, and links to each other with said double-screw bolt body through welding.
The beneficial effect of the locking double-screw bolt of the utility model is: because locking double-screw bolt has the columnar part that leans in the bottom of tapped hole; Make the screw pair between locking double-screw bolt and tapped hole have an extra axial pre tightening force; When axial pre tightening force deficiency that nut provided when screwing like this or complete obiteration, himself still has certain pretightening force
Below will combine accompanying drawing that the technique effect of design, concrete structure and the generation of the utility model is described further, with purpose, characteristic and the effect of understanding the utility model fully.
Description of drawings
Fig. 1 is the schematic representation of the connecting mode of double-screw bolt of the prior art;
Fig. 2 is a specific embodiment of the locking double-screw bolt in the utility model;
Fig. 3 is the schematic representation of a specific embodiment of the connecting mode of the locking double-screw bolt that provides of the utility model.
Embodiment
Fig. 2 and Fig. 3 show the embodiment and the connecting mode thereof of the locking double-screw bolt of the utility model.
Visible from Fig. 2; The locking double-screw bolt of the utility model and the main distinction of common double-screw bolt of the prior art are: the double-screw bolt body 2 of locking double-screw bolt has axially extended on it screws in the termination of first end of tapped hole, the columnar part 5 coaxial with double-screw bolt body 2.Wherein, the radial dimension d of columnar part 5 is less than double-screw bolt body 2 externally threaded root diameter (i.e. the path of this screw thread) on first end.The length of columnar part 5 and the double-screw bolt body 2 externally threaded length sum l on first end is greater than the hole depth L of tapped hole.Like this, screw in the process of tapped hole of workpiece 4 at first end of double-screw bolt body 2, the end of columnar part 5 will lean on the bottom of tapped hole.In addition, in order to guarantee not damage tapped hole, also increase the lifting surface area between the end of bottom and columnar part 5 of tapped hole simultaneously, also be provided with chamfering in the end of this columnar part.Wherein columnar part 2 can be integrated through means such as casting, forging, machinings with double-screw bolt body 5, also can link together through means such as welding, splicing.
As shown in Figure 3, during connection, at first first end that has columnar part 5 with double-screw bolt body 2 passes workpiece 3 by the through hole on the workpiece 3, screws in the tapped hole on the workpiece 4, and columnar part 5 is leaned at the bottom of the hole of the interior threaded hole of workpiece 4; And then with the first end second opposed end on the nut 1 of screwing.
Like this; When first end of double-screw bolt body 2 screws in the tapped hole of workpiece 4; Because leaning of the bottom in columnar part 5 double thread holes makes the bottom of tapped hole apply an axial pre tightening force F through the screw pair between the tapped hole of 5 pairs of double-screw bolt bodies 2 of columnar part and workpiece 4
1When screwing nut 1 on second end at double-screw bolt body 2, can produce aforesaid axial pre tightening force F again.Like this, the suffered axial pre tightening force of the screw pair between the tapped hole of double-screw bolt body 2 and workpiece 4 will be both stacks, be F
1With the F sum, the suffered axial pre tightening force of the screw pair between double-screw bolt body 2 and the nut 1 then only is F.Therefore, when remove connecting, screw out or when unscrewing nut 1, perhaps nut 1 self takes place loosening or when getting loose, though the axial pre tightening force F that the nut 1 of screwing is produced can reduce even disappear, owing to axial pre tightening force F
1Existence, even if under the F=0 situation, still can keep certain frictional force between the screw pair of double-screw bolt body 2 and tapped hole, screwed out or got loose.At this moment, screw out nut 1, also can from the tapped hole of workpiece 4, do not screwed out according to the locking double-screw bolt of the utility model.And under normal coupled situation, the scyewed joint between workpiece 4 and the double-screw bolt body 2 is owing to receive extra axial pre tightening force F
1, therefore,, the scyewed joint between nut 1 and the double-screw bolt body 2 compares with only being arranged, and can be more firm.
Further, the utility model can also comprise following mode of execution:
Above-mentioned have the columnar part from its double-screw bolt body one end extension according to the locking double-screw bolt among the embodiment of the utility model; But also can have the described columnar part of extending simultaneously from its two ends, any end of double-screw bolt all can screw in the tapped hole and produce above-mentioned anti-loosing effect at this moment.
Described columnar part is preferably cylinder, but also can be the cylinder of other shapes, like prism, cylindroid etc.
Described columnar part can be solid, also can be the hollow cylinder of similar tubular.
The end of described columnar part can be for flat, also can be other shapes such as spherical, taper, round table-like or cone table shape.
When the end of described columnar part can be provided with chamfering or rounding.
Described columnar part is roughly coaxial with double-screw bolt preferably, but also can disalignment.
A plurality of described columnar part also can be arranged on the same end of double-screw bolt.
Further, described columnar part can also be elastic members such as pressure spring, and this moment, pressure spring can link to each other with the double-screw bolt body through welding.
More than describe the preferred embodiment of the utility model in detail.The ordinary skill that should be appreciated that related domain need not creative work and just can make many modifications and variation according to the design of the utility model.Therefore, all technician in the art according to the design of the utility model on the basis of existing technology through the available technological scheme of logical analysis, reasoning, or a limited experiment, all should be in determined protection domain by claims.
Claims (8)
1. a locking double-screw bolt comprises the double-screw bolt body, and said double-screw bolt body comprises and has externally threaded two ends; Wherein an end supplies to screw in the tapped hole; It is characterized in that said locking double-screw bolt also comprises columnar part, said columnar part extends axially from a described end; The radial dimension of said columnar part is less than externally threaded path on the described end, and the externally threaded length sum on the length of said columnar part and the said end is greater than the bottom outlet degree of depth of said tapped hole.
2. locking double-screw bolt as claimed in claim 1, wherein said columnar part is coaxial with said double-screw bolt body.
3. according to claim 1 or claim 2 locking double-screw bolt, wherein said columnar part is cylinder or prism.
4. locking double-screw bolt as claimed in claim 3, wherein said columnar part and said double-screw bolt body are integrated.
5. locking double-screw bolt as claimed in claim 3, the end of wherein said columnar part is provided with chamfering or rounding.
6. locking double-screw bolt as claimed in claim 3, the end of wherein said columnar part are sphere, taper, frustoconic shape or taper type.
7. locking double-screw bolt as claimed in claim 1, wherein said columnar part are pressure spring.
8. locking double-screw bolt as claimed in claim 7, wherein said pressure spring links to each other with said double-screw bolt body through welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203875280U CN202301390U (en) | 2011-10-12 | 2011-10-12 | Loosing-preventing double-screw bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011203875280U CN202301390U (en) | 2011-10-12 | 2011-10-12 | Loosing-preventing double-screw bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202301390U true CN202301390U (en) | 2012-07-04 |
Family
ID=46370297
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011203875280U Expired - Lifetime CN202301390U (en) | 2011-10-12 | 2011-10-12 | Loosing-preventing double-screw bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202301390U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847769A (en) * | 2014-02-18 | 2015-08-19 | 山东华源莱动内燃机有限公司 | Double-end stud |
| CN108246824A (en) * | 2018-03-16 | 2018-07-06 | 中车株洲电机有限公司 | A kind of locking anti-drop device of double threaded screw |
-
2011
- 2011-10-12 CN CN2011203875280U patent/CN202301390U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104847769A (en) * | 2014-02-18 | 2015-08-19 | 山东华源莱动内燃机有限公司 | Double-end stud |
| CN108246824A (en) * | 2018-03-16 | 2018-07-06 | 中车株洲电机有限公司 | A kind of locking anti-drop device of double threaded screw |
| CN108246824B (en) * | 2018-03-16 | 2023-11-03 | 中车株洲电机有限公司 | Anti-loosening device for double-headed screw |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: SHANGHAI DITE PRECISION FASTENER CO., LTD. Free format text: FORMER NAME: SHANGHAI DETROIT PRECISION FASTENER CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 3 building seventh, building 1055, Fu Hai Road, Jiading Industrial Zone, Shanghai, Jiading District, 201821 Patentee after: SHANGHAI DETROIT PRECISION FASTENER CO., LTD. Address before: 3 building seventh, building 1055, Fu Hai Road, Jiading Industrial Zone, Shanghai, Jiading District, 201821 Patentee before: Shanghai Detroit Precision Fastener Co., Ltd. |
|
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120704 |