CN213839220U - Reverse double-tooth check bolt structure - Google Patents
Reverse double-tooth check bolt structure Download PDFInfo
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- CN213839220U CN213839220U CN202022393412.XU CN202022393412U CN213839220U CN 213839220 U CN213839220 U CN 213839220U CN 202022393412 U CN202022393412 U CN 202022393412U CN 213839220 U CN213839220 U CN 213839220U
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Abstract
The utility model discloses a reverse double-tooth check bolt structure, including bolt, fastening nut and lock nut, the bolt includes screw rod and head, is equipped with left-handed coarse thread and dextrorotation fine thread on the screw rod, and left-handed coarse thread is left-handed thread and the tooth form of left-handed coarse thread is rectangle or trapezoidal, and dextrorotation fine thread sets up on the tooth of left-handed coarse thread, and dextrorotation fine thread is right-handed thread and the tooth form of dextrorotation fine thread is triangle-shaped, and lock nut is located fastening nut top, compresses tightly between lock nut and the fastening nut; the fastening nut is in threaded connection with the left-hand thread, the internal thread of the fastening nut is matched with the left-hand thread, the locking nut is in threaded connection with the right-hand thread, the internal thread of the locking nut is matched with the right-hand thread, or the fastening nut is in threaded connection with the right-hand thread, the internal thread of the fastening nut is matched with the right-hand thread, and the locking nut is in threaded connection with the left-hand thread, and the internal thread of the locking nut is matched with the left-hand thread. The utility model discloses simple structure, easy dismounting fastens effectually, and difficult pine moves back.
Description
Technical Field
The utility model relates to a check bolt especially relates to a reverse double-tooth check bolt structure.
Background
Threaded connection fastener usually means that ordinary bolt and nut is locking with axial force fastening mode, makes standard universal, because receives the influence of operating condition environment, and the bolt is not hard up often is a matter, but if not paying attention to, often can cause equipment vibration, part damage, even casualties. How to tighten a small nut is always a long and lasting topic in mechanical design.
The existing common bolt anti-loosening mode is to add a plain washer or a spring washer (friction anti-loosening) between a connected piece and a nut, the nut anti-loosening mode is convenient for disassembling the nut, but under the conditions of impact, vibration and variable load, the bolt can cause the reduction of pre-tightening force due to loosening, the lost pre-tightening force is slowly increased along with the increase of vibration times, and finally the nut loosening and the thread coupling failure can be caused.
SUMMERY OF THE UTILITY MODEL
The utility model relates to a solve prior art's the relatively poor problem of adding plain washer or the locking effect of spring washer, provide a simple structure, easy dismounting, the fastening is effectual, the reverse double-tooth check bolt that difficult pine moved back.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a reverse double-tooth anti-loose bolt structure comprises a bolt, wherein the bolt comprises a screw rod and a head, left-handed coarse threads and right-handed fine threads are arranged on the screw rod, the left-handed coarse threads are left-handed threads, the tooth form of the left-handed coarse threads is rectangular or trapezoidal, the right-handed fine threads are arranged on the teeth of the left-handed coarse threads, the right-handed fine threads are right-handed threads, the tooth form of the right-handed fine threads is triangular, the reverse double-tooth anti-loose bolt structure further comprises a fastening nut and a locking nut, the locking nut is positioned above the fastening nut, and the locking nut and the fastening nut are tightly pressed; the fastening nut is in threaded connection with the left-handed thread and the internal thread of the fastening nut is matched with the left-handed thread, the locking nut is in threaded connection with the right-handed thread and the internal thread of the locking nut is matched with the right-handed thread, or the fastening nut is in threaded connection with the right-handed thread and the internal thread of the fastening nut is matched with the right-handed thread, and the locking nut is in threaded connection with the left-handed thread and the internal thread of the locking nut is matched with the left-handed thread. The utility model discloses a two nuts are locking, and set up two kinds of different tooth types simultaneously on the screw rod, revolve to the external screw thread, make fastening nut, lock nut respectively with different external screw thread spiro union, after fastening nut and lock nut tighten up like this, there is interact's pressure between two nuts all the time, there is any one in two nuts to rotate and all need overcome the frictional force between the screw thread that closes soon, and the spiral of dextrorotation coarse thread and levogyration fine thread is opposite, fastening nut's pine moves back the direction and is locking nut's the direction of screwing up (the pine moves back the power that the power directly converts lock nut to that moves back of power promptly), make fastening nut difficult pine move back.
Preferably, a convex ring is formed on the upper end face of the fastening nut in a protruding mode, an annular wedge-shaped inclined plane is arranged on the outer side of the edge of the upper end of the convex ring, an annular groove matched with the convex ring is formed in the lower end face of the locking nut, and a pressing inclined plane matched with the wedge-shaped inclined plane is arranged on the outer wall face of the annular groove. When the fastening nut and the locking nut are screwed up, the convex ring enters the annular groove, the annular groove plays a role in radial limiting, radial relative looseness generated between the fastening nut and the locking nut can be avoided, the pressing inclined plane tightly supports against the wedge-shaped inclined plane, a large locking force can be generated, and the anti-loosening effect is further improved.
Preferably, the center line of symmetry of the male ring does not coincide with the center line of symmetry of the threaded hole in the left-hand fastening nut. The distance between the symmetrical center line of the convex ring and the symmetrical center line of the threaded hole is 0.3mm-0.8 mm; the taper full angle of the annular wedge-shaped inclined plane at the upper end of the convex ring is 24-25 degrees. After the fastening nut is screwed in place, the locking nut is screwed until the annular groove of the locking nut is in concave-convex fit with the convex ring, and because the end of the convex ring is a slightly eccentric conical end (the outer side of the conical end is thin and the inner side of the conical end is thick), the inner wall surface of the annular groove extrudes the eccentric conical end in the screwing-down process of the locking nut, the fastening nut is subjected to inward extrusion force, and at the moment, the whole fastening nut has a slight tendency (namely, the symmetrical center line of the through hole of the fastening nut is not coincident with the symmetrical center line of the screw rod), so that the locking purpose is achieved.
Preferably, the height of the convex ring is greater than the depth of the annular groove.
Preferably, the thread form angle of the left-handed coarse threads is 30 degrees, the thread form angle of the right-handed fine threads is 60 degrees, the anti-loosening friction force is large, and the stress is uniform.
Therefore, the utility model discloses following beneficial effect has:
(1) double nuts are adopted for preventing looseness, when the fastening nut and the locking nut are screwed, the two nuts always have interactive pressure, and the friction force between screwing threads needs to be overcome when any one of the two nuts needs to rotate, so that the looseness preventing effect is good;
(2) the screw rod is simultaneously provided with two external threads with different tooth shapes and rotation directions, the fastening nut and the locking nut, and the loosening direction of the fastening nut is the tightening direction of the locking nut (namely the loosening force of the fastening nut is directly converted into the tightening force of the locking nut), so that the fastening nut is not easy to loosen.
Drawings
Fig. 1 is a half-section view of the utility model.
Fig. 2 is a front view of the fastening nut of the present invention.
Fig. 3 is a cross-sectional view of the lock nut of the present invention.
Fig. 4 is an enlarged view at a in fig. 1.
In the figure: screw rod 1, head 2, fastening nut 3, lock nut 4, levogyration coarse thread 5, dextrorotation fine thread 6, bulge loop 7, wedge inclined plane 8, annular groove 9, compress tightly inclined plane 10.
Detailed Description
The invention is further described with reference to the accompanying drawings and the detailed description.
The reverse double-thread anti-loose bolt structure shown in fig. 1-4 comprises a bolt, wherein the bolt comprises a screw rod 1 and a head 2, the screw rod is provided with a left-handed coarse thread 5 and a right-handed fine thread 6, the left-handed coarse thread is a left-handed thread, the thread form of the left-handed coarse thread is rectangular or trapezoidal, the right-handed fine thread is arranged on the thread form of the left-handed coarse thread, the right-handed fine thread is a right-handed thread, the thread form of the right-handed fine thread is triangular, the reverse double-thread anti-loose bolt structure further comprises a fastening nut 3 and a locking nut 4, the locking nut is positioned above the fastening nut, and the locking nut and the fastening nut are tightly pressed; the fastening nut is in threaded connection with the left-handed thread and the internal thread of the fastening nut is matched with the left-handed thread, the locking nut is in threaded connection with the right-handed thread and the internal thread of the locking nut is matched with the right-handed thread, or the fastening nut is in threaded connection with the right-handed thread and the internal thread of the fastening nut is matched with the right-handed thread, and the locking nut is in threaded connection with the left-handed thread and the internal thread of the locking nut is matched with the left-handed thread. The upper end face of the fastening nut protrudes to form a convex ring 7, the outer side of the upper end edge of the convex ring is provided with an annular wedge-shaped inclined plane 8, the lower end face of the locking nut is provided with an annular groove 9 matched with the convex ring, and the outer wall face of the annular groove is provided with a compression inclined plane 10 matched with the wedge-shaped inclined plane. The centre line of symmetry of said collar is not coincident with the centre line of symmetry of the threaded hole in the fastening nut, i.e. the collar is an eccentric collar (with respect to the threaded hole of the fastening nut). The distance between the symmetrical center line of the convex ring and the symmetrical center line of the threaded hole is 0.3mm-0.8 mm; the taper full angle of the annular wedge-shaped inclined plane at the upper end of the convex ring is 24-25 degrees. The height of the convex ring is larger than the depth of the annular groove. The thread form angle of the left-handed coarse threads is 30 degrees, and the thread form angle of the right-handed fine threads is 60 degrees; when the internal thread of the fastening nut is in a shape with a tooth form angle of 30 degrees and a rectangular or trapezoidal shape, the internal thread of the locking nut is in a shape with a tooth form angle of 60 degrees and a triangular shape; when the internal thread of the lock nut has a profile angle of 30 ° and a profile of a rectangle or trapezoid, the internal thread of the fastening nut has a profile angle of 60 ° and a profile of a triangle.
The utility model discloses a use method does: and (3) penetrating a screw rod in the bolt through the connected piece, screwing a fastening nut on the screw rod until the screw rod is fastened, screwing a fastening nut on the screw rod until the upper part of the convex ring is positioned in the annular groove, and screwing the fastening nut until the fastening nut cannot be screwed continuously.
It is to be understood that: although above-mentioned embodiment is right the utility model discloses a design has done more detailed word description, but these word descriptions, are only right the utility model relates to a simple word description of idea, rather than right the utility model relates to a restriction of idea, any do not surpass the utility model relates to a combination, increase or the modification of idea all fall into the utility model discloses a within the protection scope.
Claims (6)
1. The utility model provides a reverse two-tooth check bolt structure, includes the bolt, the bolt includes screw rod (1) and head (2), its characterized in that, be equipped with levogyration coarse thread (5) and dextrorotation fine thread (6) on the screw rod, levogyration coarse thread is levogyration screw thread and the tooth form of levogyration coarse thread is rectangle or trapezoidal, dextrorotation fine thread sets up on the tooth of levogyration coarse thread, dextrorotation fine thread is the tooth form of dextrorotation fine thread and dextrorotation fine thread is triangle-shaped, reverse two-tooth check bolt structure still includes fastening nut (3) and lock nut (4), and lock nut is located fastening nut top, compresses tightly between lock nut and the fastening nut; the fastening nut is in threaded connection with the left-handed thread and the internal thread of the fastening nut is matched with the left-handed thread, the locking nut is in threaded connection with the right-handed thread and the internal thread of the locking nut is matched with the right-handed thread, or the fastening nut is in threaded connection with the right-handed thread and the internal thread of the fastening nut is matched with the right-handed thread, and the locking nut is in threaded connection with the left-handed thread and the internal thread of the locking nut is matched with the left-handed thread.
2. A reverse double-tooth anti-loose bolt structure according to claim 1, characterized in that the upper end surface of the fastening nut is convexly formed with a convex ring (7), the outer side of the upper end edge of the convex ring is provided with an annular wedge-shaped inclined surface (8), the lower end surface of the locking nut is provided with an annular groove (9) adapted to the convex ring, and the outer wall surface of the annular groove is provided with a pressing inclined surface (10) adapted to the wedge-shaped inclined surface.
3. The reverse double-tooth check bolt structure according to claim 2, wherein the symmetric center line of the convex ring is not coincident with the symmetric center line of the threaded hole in the fastening nut.
4. The structure of a reverse double-tooth anti-loose bolt as claimed in claim 3, wherein the distance between the symmetric center line of the convex ring and the symmetric center line of the threaded hole is 0.3mm-0.8 mm; the taper full angle of the annular wedge-shaped inclined plane at the upper end of the convex ring is 24-25 degrees.
5. The structure of a reverse double-tooth check bolt as claimed in claim 2, wherein the height of the protruding ring is greater than the depth of the annular groove.
6. The reverse double-thread lockbolt structure of claim 1, wherein the thread form angle of the left-hand thread is 30 ° and the thread form angle of the right-hand thread is 60 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022393412.XU CN213839220U (en) | 2020-10-23 | 2020-10-23 | Reverse double-tooth check bolt structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022393412.XU CN213839220U (en) | 2020-10-23 | 2020-10-23 | Reverse double-tooth check bolt structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213839220U true CN213839220U (en) | 2021-07-30 |
Family
ID=77010917
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022393412.XU Active CN213839220U (en) | 2020-10-23 | 2020-10-23 | Reverse double-tooth check bolt structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213839220U (en) |
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2020
- 2020-10-23 CN CN202022393412.XU patent/CN213839220U/en active Active
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