CN219673063U - Blind hole self-locking nut - Google Patents
Blind hole self-locking nut Download PDFInfo
- Publication number
- CN219673063U CN219673063U CN202320916236.4U CN202320916236U CN219673063U CN 219673063 U CN219673063 U CN 219673063U CN 202320916236 U CN202320916236 U CN 202320916236U CN 219673063 U CN219673063 U CN 219673063U
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- Prior art keywords
- hole
- locking nut
- self
- blind
- hole portion
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- 230000007704 transition Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 3
- 230000003313 weakening effect Effects 0.000 abstract description 2
- 238000007789 sealing Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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- Insertion Pins And Rivets (AREA)
- Connection Of Plates (AREA)
Abstract
The utility model provides a blind hole self-locking nut, including integrated into one piece's counter part and pole portion, be equipped with a plurality of receipts mouth on the circumference outer wall of pole portion, be equipped with first hole portion, second hole portion, third hole portion and the fourth hole portion that set up along length direction in proper order in the pole portion, first hole portion is adjacent with the counter part, the diameter of second hole portion is greater than the diameter of first hole portion, third hole portion, the fourth hole portion is the blind hole that is equipped with the internal thread, the nominal diameter of fourth hole portion is less than the diameter of third hole portion. The blind hole self-locking nut adopts the structure weakening treatment at the second hole part of the rod part, so that the second hole part can be bulged and deformed after riveting, the second hole part is folded to form a bulge, and the bulge and the countersunk head part are tightly attached to the two ends of the riveting plate together, so that the riveting and fixing of the blind hole self-locking nut can be completed. The blind hole self-locking nut is particularly suitable for the situation that the performance requirements such as the strength of the traditional nut or the manufactured screw thread cannot be met due to the limitations of the structure, the materials and the space positions.
Description
Technical Field
The utility model relates to a blind nut, in particular to a blind self-locking nut suitable for a very small space.
Background
In aerospace and other fields, there are many situations in which a conventional nut cannot be used due to limitations in structure, materials and space positions, or an applicable thread cannot be manufactured, or the strength performance requirement of the manufactured thread cannot meet the requirement. In addition, in many high temperature environments, corrosion resistant environments and environments with sealing requirements, the conventional fasteners cannot meet the use requirements, and particularly when the installation space is small, the conventional fasteners cannot meet the use requirements.
Disclosure of Invention
The utility model aims to solve the problems and provide the blind hole self-locking nut which has small installation requirement space, reliable connection and sealing.
In order to solve the problems, the utility model provides a blind hole self-locking nut which is characterized by comprising a countersunk head part and a rod part which are integrally formed, wherein a plurality of receiving parts are arranged on the circumferential outer wall of the rod part, a first hole part, a second hole part, a third hole part and a fourth hole part which are arranged along the length direction are sequentially arranged in the rod part, the first hole part is adjacent to the countersunk head part, the diameter of the second hole part is larger than that of the first hole part and the third hole part, the fourth hole part is a blind hole with internal threads, and the nominal diameter of the fourth hole part is smaller than that of the third hole part.
Further, the diameter of the first hole portion is identical to the diameter of the third hole portion.
Further, the joint of the first hole part and the second hole part is transited through chamfering; the joint of the second hole part and the third hole part is transited through chamfering; the joint of the third hole part and the fourth hole part is in transition through chamfering.
Further, the length of the third hole portion is smaller than the length of the second hole portion.
Further, the length of the first hole part is 0.15mm to 0.3mm smaller than the thickness of the rivet plate to be mounted.
Further, 3 closing-in parts are arranged and are uniformly distributed on the circumferential outer wall corresponding to the fourth hole part.
Further, the rod portion can be folded and deformed at the second hole portion to bulge outwards to form a bulge, and when the bulge is formed at the rod portion, the total length of the blind hole self-locking nut is smaller than 9mm and larger than 5mm.
Further, the ratio of the wall thickness at the first hole portion and the third hole portion to the diameter of the rod portion is 8% -12%.
Further, the ratio of the wall thickness at the second hole portion to the diameter of the stem portion is 7% to 8%.
Further, the nominal diameter of the fourth hole part is smaller than or equal to 4mm and larger than 1mm; the internal thread of the fourth hole part is provided with at least 3.5 effective teeth.
The present utility model has an advantageous contribution in that it effectively solves the above-mentioned problems. The blind hole self-locking nut comprises the countersunk head part and the rod part which are integrally formed, and the second hole part of the rod part is subjected to structure weakening treatment, so that the second hole part can be bulged and deformed after riveting, the second hole part is folded to form a bulge, and the bulge and the countersunk head part are tightly attached to two ends of a riveting plate together, so that riveting and fixing of the blind hole self-locking nut can be completed. The blind hole self-locking nut is particularly suitable for the situation that the performance requirements such as the strength of the traditional nut or the manufactured screw thread cannot be met due to the restrictions of the structure, the materials and the space position, and the screw thread fastening connection in the high-temperature, corrosion-resistant and sealed environment.
Drawings
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a front view of the present utility model.
Fig. 3 is another elevation view of the utility model.
Fig. 4 is a schematic view of a partial structure of a bulge formed by deformation of the present utility model.
Fig. 5 is a cross-sectional view of the utility model prior to staking.
Fig. 6 is a cross-sectional view of the present utility model after staking.
The attached drawings are identified: countersunk head portion 10, shaft portion 20, first hole portion 21, second hole portion 22, third hole portion 23, fourth hole portion 24, bulge 25, closing-in portion 30, and caulking plate 40.
Detailed Description
The following examples are further illustrative and supplementary of the present utility model and are not intended to limit the utility model in any way.
As shown in fig. 1 to 6, the blind hole self-locking nut of the present utility model includes a countersunk head portion 10 and a shank portion 20 which are integrally formed.
The shank 20 and countersunk head 10 are made of a high temperature alloy, which still ensures good tensile strength at a temperature of 400 ℃.
As shown in fig. 2 and 3, the countersunk head 10 may be one of a 100 ° countersunk head, a 130 ° countersunk head, or an elliptical head with one end of 60 ° and one end of 70 °, which may be specifically selected according to practical requirements. Preferably, in this embodiment, the countersunk portion 10 is an oval head, so that the nut is prevented from rotating during the installation process.
As shown in fig. 1, the rod portion 20 has a long rod shape, and a plurality of receiving portions 30 are provided on the circumferential outer wall thereof, so as to form a self-locking structure, and meet the requirements of the nut on various mechanical properties such as moment, anti-loosening and vibration-resisting properties.
Further, 3 closing-in portions 30 are provided, which are uniformly distributed on the circumferential outer wall of the shaft portion 20. The closing-in portion 30 may be a point closing-in portion according to a known technique.
As shown in fig. 1, a first hole 21, a second hole 22, a third hole 23, and a fourth hole 24 are provided in the rod 20 in this order in the longitudinal direction.
As shown in fig. 1, the first hole 21 is adjacent to the countersunk head 10, and the first hole 21 penetrates to the end surface of the countersunk head 10. The first hole portion 21 is a circular smooth hole, the length of which is 0.15 mm-0.3 mm smaller than the thickness of the caulking plate 40 to be mounted, and specific parameters thereof can be designed according to the actual caulking thickness. The blind hole self-locking nut of the present utility model is suitable for riveting a rivet plate 40 having a thickness of 2mm or less. The ratio of the wall thickness at the first hole 21 to the diameter at the corresponding position of the stem 20 (i.e., the outer diameter of the stem 20) is 8% -12%, and in this embodiment, the diameter of the first hole 21 is smaller than 5mm, which is preferably 4.2mm.
As shown in fig. 1, the second hole 22 is a bulge deformation zone, which is an annular boring groove. The diameter of the second hole 22 is larger than the diameters of the first hole 21 and the third hole 23 adjacent to the second hole 22, and the ratio of the wall thickness at the second hole 22 to the diameter at the corresponding position of the rod 20 (i.e. the outer diameter of the rod 20) is 7% -8%, so that the rod 20 is structurally weakened at the second hole 22, and further can be folded and deformed to bulge outwards to form a bulge 25 (as shown in fig. 4) during riveting. When the second hole 22 bulges outwards to form a bulge 25, the total length of the blind hole self-locking nut is smaller than 9mm and larger than 5mm.
As shown in fig. 1, the third hole 23 is a circular light hole, and its diameter is identical to that of the first hole 21. The ratio of the wall thickness at the third hole 23 to the diameter at the corresponding position of the stem 20 (i.e., the outer diameter of the stem 20) is 8% -12%, and in this embodiment, the diameter of the third hole 23 is smaller than 5mm, which is preferably 4.2mm. The length of the third hole 23 is smaller than the length of the second hole 22, and in this embodiment, the length of the third hole 23 is in the range of 0.5 to 1.5mm.
As shown in fig. 1, the fourth hole 24 is a blind hole provided with an internal thread, and has a nominal diameter smaller than that of the third hole 23. The fourth hole 24 is a blind hole structure, which can ensure the sealing of the hole. The nominal diameter of the fourth hole 24 is 4mm or less and greater than 1mm. In this embodiment, the nominal diameter of the fourth hole portion 24 is preferably 4mm. The length of the fourth hole 24 should be at least 3.5 effective teeth, so as to meet the requirement of the nut on tensile strength mechanical property.
Further, as shown in fig. 1, the connection between the first hole part 21 and the second hole part 22 is transited by chamfering. The junction of the second hole portion 22 and the second third hole is transitioned by chamfering. The connection of the third hole portion 23 and the fourth hole portion 24 is transited by chamfering.
Further, the closing-in portions 30 are uniformly distributed on the circumferential outer wall corresponding to the fourth hole portion 24, and can be adjusted to meet the requirements of various mechanical properties such as locking moment and releasing moment.
Thus, the blind hole self-locking nut of the present utility model is formed. When the blind hole self-locking nut is used, the blind hole self-locking nut can be unidirectionally installed: as shown in fig. 5, the countersunk head portion 10 is outwardly directed, the other end of the shank portion 20 opposite to the countersunk head portion 10 is inwardly fitted into the mounting hole of the rivet plate 40, and then caulking is performed using a pneumatic or electric caulking tool. Since the stem 20 is structurally weakened at the second hole 22, when being riveted, as shown in fig. 6, the stem 20 bulges out at the second hole 22 to form a bulge 25; the bulge 25 is formed to be closely attached to the end face of the rivet plate 40, and the countersunk head portion 10 is closely attached to the other end of the rivet plate 40, so that the bulge 25 and the countersunk head portion 10 cooperate to complete the rivet fixing work of the blind hole self-locking nut. After riveting and fixing, the blind hole self-locking nut is internally connected with a bolt through threads, so that other parts to be installed can be installed.
The total length of the blind hole self-locking nut after bulge deformation is smaller than 9mm, the diameter of the first hole part 21 is smaller than 5mm, and the diameter of the fourth hole part 24 is smaller than or equal to 4mm, so that the blind hole self-locking nut can meet the multi-layer connection of non-opened parts under the condition of insufficient installation space positions. In addition, the fourth aperture portion 24 ensures an effective tooth length of at least 3.5, which can meet the product's requirements for tensile strength mechanical properties. And the fourth hole portion 24 is a blind hole structure, which can ensure the sealing of the hole opening.
Although the present utility model has been disclosed by the above embodiments, the scope of the present utility model is not limited thereto, and each of the above components may be replaced with similar or equivalent elements known to those skilled in the art without departing from the spirit of the present utility model.
Claims (10)
1. The blind hole self-locking nut is characterized by comprising a countersunk head part (10) and a rod part (20) which are integrally formed, wherein a plurality of receiving parts (30) are arranged on the circumferential outer wall of the rod part (20), a first hole part (21), a second hole part (22), a third hole part (23) and a fourth hole part (24) which are arranged along the length direction are sequentially arranged in the rod part (20), the first hole part (21) is adjacent to the countersunk head part (10), the diameter of the second hole part (22) is larger than the diameters of the first hole part (21) and the third hole part (23), the fourth hole part (24) is a blind hole with internal threads, and the nominal diameter of the fourth hole part (24) is smaller than the diameter of the third hole part (23).
2. Blind self-locking nut according to claim 1, characterized in that the diameter of said first hole portion (21) corresponds to the diameter of said third hole portion (23).
3. The blind hole self-locking nut as defined in claim 1, wherein,
the joint of the first hole part (21) and the second hole part (22) is in chamfer transition;
the joint of the second hole part (22) and the third hole part (23) is in chamfer transition;
the connection part of the third hole part (23) and the fourth hole part (24) is in chamfer transition.
4. Blind self-locking nut according to claim 1, characterized in that the length of the third hole portion (23) is smaller than the length of the second hole portion (22).
5. Blind self-locking nut according to claim 1, characterized in that the length of the first hole portion (21) is 0.15-0.30 mm smaller than the thickness of the rivet plate (40) to be mounted.
6. Blind hole self-locking nut according to claim 1, characterized in that said closing-in portions (30) are provided in number of 3, which are uniformly distributed on the peripheral outer wall corresponding to said fourth hole portion (24).
7. Blind self-locking nut according to claim 1, characterized in that the shank (20) is folded and deformed at the second hole (22) to bulge outwards to form a bulge (25), the total length of the blind self-locking nut being smaller than 9mm and larger than 5mm after the shank (20) has formed the bulge (25).
8. Blind self-locking nut according to claim 1, characterized in that the ratio of the wall thickness at the first hole portion (21), the third hole portion (23) to the diameter of the shank portion is in the range of 8% to 12%.
9. Blind self-locking nut according to claim 1, characterized in that the ratio of the wall thickness at the second hole portion (22) to the diameter of the stem portion is in the range of 7% to 8%.
10. Blind self-locking nut according to claim 1, characterized in that said fourth hole portion (24) has a nominal diameter of 4mm or less, greater than 1mm; the internal thread of the fourth hole part (24) is provided with at least 3.5 effective teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320916236.4U CN219673063U (en) | 2023-04-22 | 2023-04-22 | Blind hole self-locking nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320916236.4U CN219673063U (en) | 2023-04-22 | 2023-04-22 | Blind hole self-locking nut |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219673063U true CN219673063U (en) | 2023-09-12 |
Family
ID=87924664
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320916236.4U Active CN219673063U (en) | 2023-04-22 | 2023-04-22 | Blind hole self-locking nut |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219673063U (en) |
-
2023
- 2023-04-22 CN CN202320916236.4U patent/CN219673063U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |