CN215058808U - Pretightening force fastening mechanism and fastening device - Google Patents
Pretightening force fastening mechanism and fastening device Download PDFInfo
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- CN215058808U CN215058808U CN202120734406.8U CN202120734406U CN215058808U CN 215058808 U CN215058808 U CN 215058808U CN 202120734406 U CN202120734406 U CN 202120734406U CN 215058808 U CN215058808 U CN 215058808U
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Abstract
The utility model discloses a pretightning force fastening device and fastener belongs to fastening technical field. The pretension tightening mechanism comprises a first body and a second body. Wherein, first main part includes screws up portion, first screw hole and a plurality of arc piece portion. The second body includes a second threaded portion. Through conflicting with the first screw hole of second screw portion screw in and messenger with arc piece portion, second screw portion exerts the effort and makes the one end expansion of first portion of screwing away from is kept away from to arc piece portion to make pretightning force fastening device when being used for the fastening, the great pressure of arc piece portion in radial direction, with the static friction force that increases first external screw thread and receive big more, and then reduce the risk that pretightning force fastening device gyration was come off. Compared with the prior art, the pretightening force fastening mechanism provided by the application is not easy to rotate and fall off, and has a good fastening effect.
Description
Technical Field
The utility model belongs to the technical field of the fastening, especially, pretightning force fastening device and fastener.
Background
The fastener is mainly used for fastening connection and has extremely wide application in the fields of various machines, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, instruments and the like. Common fasteners are primarily threaded screw type fasteners.
The threaded connection is realized mainly by the thread engagement of the external thread and the internal thread. In order to facilitate the screwing in of the threaded element, a certain gap is usually left between the threads of the external thread and the internal thread, which provides for a possibility of the threaded element being turned back off. General mechanical devices can generate vibration in the working process, and the continuous vibration can cause the threaded part to reversely rotate so as to fall off.
The application aims to provide a novel pretightening force fastening mechanism and a fastening device so as to solve the problem that a threaded fastener is easy to fall off.
SUMMERY OF THE UTILITY MODEL
The utility model provides a pretightning force fastening device and fastener to solve the problem that exists among the prior art.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
in a first aspect, a pretension fastening mechanism is provided, comprising:
the first main body comprises a first tightening part, a first threaded hole formed in the first tightening part and a plurality of arc-shaped sheet parts annularly arrayed at one end of the first tightening part; the outer wall surface of the arc-shaped sheet part defines a central axis, and a first external thread is formed on the outer wall surface of the arc-shaped sheet part around the central axis; the inner wall surface of the arc-shaped sheet part surrounds and forms an accommodating space with one end close to the first tightening part as a large end and one end far away from the first tightening part as a small end; the first threaded hole penetrates through the first tightening part along the central axis;
a second body including a second screw part screwed to the first screw hole; rotating the second thread part to extend the depth of the second thread part into the accommodating space; when the second thread part is abutted against the inner wall surface of the arc-shaped sheet part, the second thread part applies acting force to expand one end of the arc-shaped sheet part, which is far away from the first tightening part.
In a further embodiment, one end of the arc-shaped sheet part, which is far away from the first tightening part, is converged towards the middle, so that the arc-shaped sheet part forms a conical structure; the first external thread is a conical thread;
through the technical scheme: the deeper the degree of depth of second screw thread portion screw in, the one end expansion range that first portion of screwing away from is bigger for the arc piece portion, and then makes the arc piece portion more big in radial direction's the pressure that receives, and the static friction that first external screw thread received is bigger, reduces the risk that pretightning force fastening device gyration was come off.
In a further embodiment, the thickness of one end of the arc-shaped sheet part away from the first tightening part is greater than that of the other end;
through the technical scheme: the deeper the degree of depth of second screw thread portion screw in, the one end expansion range that first portion of screwing away from is bigger for the arc piece portion, and then makes the arc piece portion more big in radial direction's the pressure that receives, and the static friction that first external screw thread received is bigger, reduces the risk that pretightning force fastening device gyration was come off.
In a further embodiment, the first external thread has the same direction of rotation as a second external thread formed on the second threaded portion;
through the technical scheme: when the second main body is screwed in, the second thread part exerts circumferential acting force on the first main body, so that the first main body is driven to be further screwed.
In a further embodiment, the second body further comprises a second threaded portion coupled to the second threaded portion;
through the technical scheme: the second main body is rotated through the second tightening part, so that the second threaded part can be screwed in and out conveniently.
In a further embodiment, the first and second tightening parts have a cross section of a regular polygon.
In a second aspect, a pretensioning fastening device is provided, which comprises the pretensioning fastening mechanism described in the above embodiments.
In a further embodiment, the device further comprises a third main body, wherein a third threaded hole is formed in the third main body, and a third internal thread matched with the first external thread is formed in the third threaded hole;
through the technical scheme: the first main body is in threaded connection with the third main body, the arc-shaped piece part is screwed into the third threaded hole, and the second threaded part is rotated to enable part of the second threaded part to enter the accommodating space; when second screw thread portion contradicts with the internal face of arc piece portion, second screw thread portion applys the effort and makes the one end expansion of first portion of screwing up is kept away from to the arc piece portion, and the deepening of second screw thread portion screw in, then the one end expansion range that first portion of screwing up was kept away from to the arc piece portion is big more to make the internal thread of first external screw thread and the third screw hole of arc piece portion tightly laminate, increase the static friction force that first external screw thread received, thereby reduce the risk that pretightning force fastening device gyration was come off.
Has the advantages that: the utility model provides a pretightning force fastener includes pretightning force fastening mechanism. The pretension tightening mechanism comprises a first body and a second body. Wherein, first main part includes screws up portion, first screw hole and a plurality of arc piece portion. The second body includes a second threaded portion. Through conflicting with the first screw hole of second screw portion screw in and messenger with arc piece portion, second screw portion exerts the effort and makes the one end expansion of first portion of screwing away from is kept away from to arc piece portion to make pretightning force fastening device when being used for the fastening, the great pressure of arc piece portion in radial direction, with the static friction force that increases first external screw thread and receive big more, and then reduce the risk that pretightning force fastening device gyration was come off. Compared with the prior art, the pretightening force fastening mechanism provided by the application is not easy to rotate and fall off, and has a good fastening effect.
Drawings
Fig. 1 is a schematic structural diagram of the pretightening force fastening mechanism of the present invention.
Fig. 2 is a schematic structural diagram of the first main body of the present invention.
FIG. 3 is a cross-sectional view of the first body according to one embodiment.
FIG. 4 is a cross-sectional view of a pretensioning tightening mechanism in accordance with an embodiment.
FIG. 5 is a cross-sectional view of the first body in a second embodiment.
FIG. 6 is a cross-sectional view of the pretensioning tightening mechanism in the second embodiment.
Fig. 7 is a schematic structural diagram of the pretightening force fastening device of the present invention.
FIG. 8 is a cross-sectional view of the pretensioning fastening device in the third embodiment.
FIG. 9 is a cross-sectional view of a pretensioning device in a fourth embodiment.
Each of fig. 1 to 9 is labeled as: the first body 10, the first tightening part 11, the first screw hole 111, the arc-shaped piece 12, the first male screw 121, the receiving space 122, the second body 20, the second screw part 21, the second tightening part 22, the third body 30, and the third screw hole 31.
Detailed Description
The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings and embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without any creative effort belong to the protection scope of the present invention.
It has been found that conventional fasteners are primarily threaded connections. The threaded connection is realized mainly by the thread engagement of the external thread and the internal thread. A certain gap is usually left between the threads of the external thread and the internal thread, which makes it possible for the threaded connection to swivel out. In order to solve the problem, the utility model provides a pretightning force fastening device and fastener.
Example one
As shown in fig. 1, the present embodiment provides a pretension tightening mechanism, comprising: a first body 10 and a second body 20.
Specifically, referring to fig. 2 to 4, the first body 10 includes a first tightening part 11 and a plurality of arc-shaped sheet parts 12. The first tightening part 11 may have a regular polygonal column structure, that is, the cross section of the first tightening part 11 is a regular polygon. One end of the arc-shaped piece portion 12 is fixedly connected to one end of the first body 10. Meanwhile, the arc-shaped sheet portions 12 are arranged in an annular array. The outer wall surface of the arc-shaped piece portion 12 defines a central axis. A first external thread 121 is formed on the outer wall surface of the arc piece portion 12 around the center axis. The inner wall surface of the arc-shaped piece portion 12 surrounds and forms a housing space 122. The accommodating space 122 has a large end close to the first tightening part 11 and a small end far from the first tightening part 11. To achieve this structure, the arc-shaped piece portion 12 is designed in a tapered structure in which one end thereof remote from the first tightening portion 11 converges toward the middle. Correspondingly, the first external thread 121 is a conical thread. The first tightening portion 11 is provided with a first threaded hole 111, and the first threaded hole 111 penetrates through the first tightening portion 11 along a central axis defined by an outer wall surface of the arc-shaped piece portion 12. The second body 20 includes a second threaded portion 21. The second threaded portion 21 is threadedly engaged with the first threaded hole 111. Wherein, the inner wall surface of the first threaded hole 111 is provided with a first internal thread, the second threaded part 21 is provided with a second external thread, and the first internal thread is matched with the second external thread. The depth of the second threaded part 21 into the receiving space 122 is extended by rotating the second threaded part. When the second screw portion 21 abuts against the inner wall surface of the arc-shaped piece portion 12, the second screw portion 21 exerts a force to radially expand the end of the arc-shaped piece portion 12 away from the first tightening portion 11. When the pretightening force fastening mechanism is used for fastening, on one hand, the first external thread 121 is tightly meshed with the internal thread of the connected piece, and a gap between the first external thread and the internal thread is eliminated; on the other hand, the greater the pressure of the arc-shaped piece portion 12 in the radial direction, the greater the static friction force applied to the first external thread 121 is, and the risk of the pre-tightening force fastening mechanism rotating and falling off is reduced. The deeper the second thread portion 21 is screwed in, the larger the expansion range of the end of the arc-shaped piece portion 12 away from the first screwing portion 11 is, so that the larger the pressure applied to the arc-shaped piece portion 12 in the radial direction is, the larger the static friction force applied to the first external thread 121 is, and the lower the risk that the pretightening force fastening mechanism rotates and falls off is. In order to facilitate the rotation of the second threaded portion 21, the second body 20 further includes a second tightening portion 22, and the second tightening portion 22 is fixedly connected to one end of the second threaded portion 21. The second tightening part 22 may also have a regular polygonal column structure, i.e., the cross section of the second tightening part 22 is a regular polygon.
The direction of rotation of the first male screw 121 is the same as the direction of rotation of the second male screw formed in the second screw portion 21. When the second body 20 is screwed in, the first body 10 is circumferentially forced by the second threaded portion 21, so that the first body 10 is further tightened. The structure can further reduce the risk of the rotation and falling of the pretightening force fastening mechanism.
Example two
As shown in fig. 1, the present embodiment provides a pretension tightening mechanism, comprising: a first body 10 and a second body 20.
Specifically, the structure of the second body 20 in the present embodiment is the same as the structure of the second body 20 in the first embodiment, and the main difference is the specific structure of the first body 10.
Referring to fig. 2, 5 and 6, the first body 10 in this embodiment also includes a first tightening part 11 and a plurality of arc-shaped piece parts 12. The first tightening part 11 may have a regular polygonal column structure, that is, the cross section of the first tightening part 11 is a regular polygon. One end of the arc-shaped piece portion 12 is fixedly connected to one end of the first body 10. Meanwhile, the arc-shaped sheet portions 12 are arranged in an annular array. The outer wall surface of the arc-shaped piece portion 12 defines a central axis. A first external thread 121 is formed on the outer wall surface of the arc piece portion 12 around the center axis. The inner wall surface of the arc-shaped piece portion 12 surrounds and forms a housing space 122. The accommodating space 122 has a large end close to the first tightening part 11 and a small end far from the first tightening part 11. To achieve this, the arc-shaped piece portion 12 is designed such that the thickness of one end thereof remote from the first tightening portion 11 is greater than that of the other end thereof. The first tightening portion 11 is provided with a first threaded hole 111, and the first threaded hole 111 penetrates through the first tightening portion 11 along a central axis defined by an outer wall surface of the arc-shaped piece portion 12. The second body 20 includes a second threaded portion 21. The second threaded portion 21 is threadedly engaged with the first threaded hole 111. Therefore, when the second thread portion 21 is screwed in to a deeper depth, the expansion range of the end of the arc-shaped piece portion 12 away from the first screwing portion 11 is larger, so that the pressure applied to the arc-shaped piece portion 12 in the radial direction is larger, the static friction force applied to the first external thread 121 is larger, and the risk that the pretightening force fastening mechanism rotates and falls off is effectively reduced. In order to facilitate the rotation of the second threaded portion 21, the second body 20 further includes a second tightening portion 22, and the second tightening portion 22 is fixedly connected to one end of the second threaded portion 21.
The first tightening part 11 and the second tightening part 22 may both adopt regular polygon column structures, that is, the cross sections of the first tightening part 11 and the second tightening part 22 are regular polygons, so as to facilitate the force application of auxiliary tools such as a wrench or an electric tool. The direction of rotation of the first male screw 121 is the same as the direction of rotation of the second male screw formed in the second screw portion 21. When the second body 20 is screwed in, the first body 10 is circumferentially forced by the second threaded portion 21, so that the first body 10 is further tightened. The structure can further reduce the risk of the rotation and falling of the pretightening force fastening mechanism.
EXAMPLE III
As shown in fig. 7 and fig. 8, the embodiment provides a pretensioning force fastening device, which includes the pretensioning force fastening mechanism in the first embodiment, and the specific structure of the pretensioning force fastening mechanism is described in the first embodiment, which is not described herein again. Meanwhile, the pretightening force fastening device further comprises a third main body 30.
The third body 30 is provided with a third threaded hole 31. The third threaded hole 31 is formed with a third internal thread. The third internal thread is fitted with the first external thread 121. When fastening is required, the first body 10 is screwed with the third body 30. The arc-shaped piece portion 12 of the first body 10 is screwed into the third screw hole 31, and the second screw portion 21 is rotated so as to partially enter the receiving space 122. When the second screw thread portion 21 collides with the inner wall surface of the arc-shaped sheet portion 12, the second screw thread portion 21 applies an acting force to expand the end of the arc-shaped sheet portion 12 away from the first screwing portion 11, and the deeper the second screw thread portion 21 is screwed in, the larger the expansion range of the end of the arc-shaped sheet portion 12 away from the first screwing portion 11 is, so that the first external thread 121 of the arc-shaped sheet portion 12 is tightly attached to the third internal thread of the third screw hole 31, the static friction force received by the first external thread 121 is increased, and the risk of the pre-tightening force fastening mechanism falling off in a rotating manner is reduced.
Example four
As shown in fig. 7 and 9, the embodiment provides a pretensioning force fastening device, which includes the pretensioning force fastening mechanism in the second embodiment, and the specific structure of the pretensioning force fastening mechanism is described in the second embodiment, which is not described herein again. Meanwhile, the pretightening force fastening device further comprises a third main body 30.
The third body 30 is provided with a third threaded hole 31. The third threaded hole 31 is formed with a third internal thread. The third internal thread is fitted with the first external thread 121. When fastening is required, the first body 10 is screwed with the third body 30. The arc-shaped piece portion 12 of the first body 10 is screwed into the third screw hole 31, and the second screw portion 21 is rotated so as to partially enter the receiving space 122. When the second screw thread portion 21 collides with the inner wall surface of the arc-shaped sheet portion 12, the second screw thread portion 21 applies an acting force to expand the end of the arc-shaped sheet portion 12 away from the first screwing portion 11, and the deeper the second screw thread portion 21 is screwed in, the larger the expansion range of the end of the arc-shaped sheet portion 12 away from the first screwing portion 11 is, so that the first external thread 121 of the arc-shaped sheet portion 12 is tightly attached to the third internal thread of the third screw hole 31, the static friction force received by the first external thread 121 is increased, and the risk of the pre-tightening force fastening mechanism falling off in a rotating manner is reduced.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. A pretension fastening mechanism, comprising:
the first main body comprises a first tightening part, a first threaded hole formed in the first tightening part and a plurality of arc-shaped sheet parts annularly arrayed at one end of the first tightening part; the outer wall surface of the arc-shaped sheet part defines a central axis, and a first external thread is formed on the outer wall surface of the arc-shaped sheet part around the central axis; the inner wall surface of the arc-shaped sheet part surrounds and forms an accommodating space with one end close to the first tightening part as a large end and one end far away from the first tightening part as a small end; the first threaded hole penetrates through the first tightening part along the central axis;
a second body including a second screw part screwed to the first screw hole; rotating the second thread part to extend the depth of the second thread part into the accommodating space; when the second thread part is abutted against the inner wall surface of the arc-shaped sheet part, the second thread part applies acting force to expand one end of the arc-shaped sheet part, which is far away from the first tightening part.
2. The pretension fastening mechanism according to claim 1, wherein one end of the arc-shaped sheet portion, which is far away from the first tightening portion, is converged towards the middle to form a conical structure; the first external threads are conical threads.
3. The pretension fastening mechanism according to claim 1, wherein one end of the arc-shaped piece portion away from the first tightening portion is thicker than the other end.
4. The pretension fastening mechanism according to claim 1, wherein a turning direction of the first external thread is the same as a turning direction of a second external thread formed on the second threaded portion.
5. The pretension fastening mechanism of claim 1, wherein the second body further includes a second tightening portion connected to the second threaded portion.
6. The pretension fastening mechanism according to claim 4, wherein the cross section of the first tightening portion and the second tightening portion is a regular polygon.
7. A pretensioning fastening device, characterized in that it comprises a pretensioning fastening mechanism according to any one of claims 1-6.
8. The pretension fastening device according to claim 7, further comprising a third body, the third body having a third threaded hole formed therein, the third threaded hole having a third internal thread formed therein that is adapted to the first external thread.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120734406.8U CN215058808U (en) | 2021-04-10 | 2021-04-10 | Pretightening force fastening mechanism and fastening device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120734406.8U CN215058808U (en) | 2021-04-10 | 2021-04-10 | Pretightening force fastening mechanism and fastening device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215058808U true CN215058808U (en) | 2021-12-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120734406.8U Active CN215058808U (en) | 2021-04-10 | 2021-04-10 | Pretightening force fastening mechanism and fastening device |
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|---|---|
| CN (1) | CN215058808U (en) |
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2021
- 2021-04-10 CN CN202120734406.8U patent/CN215058808U/en active Active
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20221009 Address after: Room 520-1, Block A, Industry and Research Complex Building, No. 33, Jingyou Road, Jiangning District, Nanjing City, Jiangsu Province, 210000 (Jiangning High-tech Park) Patentee after: Nanjing Sundeli Material Technology Co.,Ltd. Address before: 211188 no.629 longmian Avenue, Science Park, Jiangning District, Nanjing City, Jiangsu Province Patentee before: NANJING COMMUNICATIONS INSTITUTE OF TECHNOLOGY |
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Effective date of registration: 20230901 Address after: Room 313/1-2, 3rd Floor, Building 3A, Building 3, Nanjing Xianlin Zhigu, No. 6 Qimin West Road, Xianlin Street, Qixia District, Nanjing City, Jiangsu Province, 210000 Patentee after: Nanjing Hufei Electronic Technology Co.,Ltd. Address before: Room 520-1, Block A, Industry and Research Complex Building, No. 33, Jingyou Road, Jiangning District, Nanjing City, Jiangsu Province, 210000 (Jiangning High-tech Park) Patentee before: Nanjing Sundeli Material Technology Co.,Ltd. |