CN110985516A - Anti-loose bolt and nut - Google Patents
Anti-loose bolt and nut Download PDFInfo
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- CN110985516A CN110985516A CN201911397258.9A CN201911397258A CN110985516A CN 110985516 A CN110985516 A CN 110985516A CN 201911397258 A CN201911397258 A CN 201911397258A CN 110985516 A CN110985516 A CN 110985516A
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- 230000009471 action Effects 0.000 description 2
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- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B39/00—Locking of screws, bolts or nuts
- F16B39/02—Locking of screws, bolts or nuts in which the locking takes place after screwing down
- F16B39/12—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts
- F16B39/16—Locking of screws, bolts or nuts in which the locking takes place after screwing down by means of locknuts in which the screw-thread of the locknut differs from that of the nut
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mutual Connection Of Rods And Tubes (AREA)
Abstract
The invention provides a check bolt nut which comprises a bolt, a first nut and a second nut, wherein the bolt comprises a fixed end and a screw rod, the screw rod is provided with a first thread and a second thread, and the rotating directions of the two threads are opposite; the screw penetrates into the connected piece and is sequentially screwed into the first nut and the second nut to enable the connected piece to be tightly attached to the fixed end; the first nut is provided with an internal thread matched with the first thread; the second nut is provided with an internal thread matched with the second thread; the first thread has a nominal diameter greater than a nominal diameter of the second thread. The anti-loosening bolt and nut disclosed by the invention are simple in structure and convenient to operate, two kinds of double nuts with opposite rotation directions are arranged on the stepped screw rod and are matched with each other, the connecting ends of the two nuts are respectively provided with the helical teeth, and the helical teeth are mutually meshed, so that the bolt and nut are provided with an anti-loosening permanent self-locking structure, the bolt and nut are ensured to be permanently, firmly and firmly connected, and the problem of bolt loosening caused by alternate strain generated by external disturbance factors such as alternating load or equipment vibration is solved.
Description
Technical Field
The invention belongs to the technical field of mechanical fastening, and particularly relates to a lockbolt nut.
Background
The screw thread connection is the most commonly used connection mode at present, one of the advantages of the screw thread connection is that the screw thread connection is detachable and easy to maintain compared with other connections, but the screw thread connection is also the weakness of the screw thread connection, and particularly in large-scale mechanical equipment such as trains, automobiles, airplanes, tanks and the like which run at high speed and have strong vibration, the vicious incidents of vehicle overturning and man death of the airplane caused by loosening, fatigue fracture and the like of the screw thread connection are many. With the development of machinery to high speed and precision, the development of industrial scale to large scale and automation, the development of aerospace technology and the like, the anti-loosening problem of threaded fastener connection is more and more prominent. Typically, the fastener has a life against vibration untwisting that is much less than the fatigue life of other materials and structures, i.e., the fastener has failed to untwist well before fatigue failure. Therefore, the problem of looseness prevention of the screw coupling has been considered and the subject of research has been made.
At present, the anti-loosening form of bolt connection is various, wherein the common one is that double nuts are used for replacing single nut connection, but the anti-loosening effect cannot be completely ensured by the form, when external disturbance factors such as alternating load or equipment vibration and the like are generated and the connection acting plate generates alternating strain, the anti-loosening effect cannot be achieved, after a period of time, the check and the fastening are required to be carried out again, and the connection reliability is influenced to a certain degree.
Therefore, there is a need to provide an improved solution to the above-mentioned deficiencies of the prior art.
Disclosure of Invention
The invention aims to provide a check bolt and nut with a permanent self-locking structure for at least solving the problem that the conventional double-nut bolt has a check structure which generates alternate strain due to external disturbance factors such as alternating load or vibration and the like to cause bolt loosening.
In order to achieve the above purpose, the invention provides the following technical scheme:
a check bolt nut comprises a bolt, a first nut and a second nut, wherein the bolt comprises a fixed end and a screw, a first thread and a second thread are arranged on the screw, and the rotation directions of the first thread and the second thread are opposite; the screw penetrates into the connected piece and is sequentially screwed into the first nut and the second nut to enable the connected piece to be tightly attached to the fixed end;
the first nut is provided with an internal thread matched with the first thread; the second nut is provided with an internal thread matched with the second thread; the first thread has a nominal diameter greater than a nominal diameter of the second thread.
In the above anti-loose bolt and nut, as a preferable scheme, a relief groove is arranged at the connection position of the first thread and the second thread, and the relief groove is in fillet transition.
In the above anti-loose bolt nut, as a preferred scheme, a plurality of first helical teeth are uniformly arranged on the upper end surface of the first nut in the circumferential direction, and the plurality of first helical teeth are uniformly arranged along the upper end surface of the first nut in an inclined step shape in the circumferential direction;
a plurality of second helical teeth are uniformly arranged on the lower end surface of the second nut in the circumferential direction, and are uniformly distributed along the lower end surface of the second nut in an inclined step shape;
the first helical teeth and the second helical teeth are meshed with each other and used for preventing the first nut and the second nut from loosening.
In the above anti-loose bolt nut, as a preferred scheme, a plurality of first helical teeth are uniformly arranged on the upper end surface of the first nut in the circumferential direction, and the first helical teeth are uniformly arranged along the upper end surface of the first nut in an inclined step shape in the circumferential direction;
the lower end face of the second nut is provided with an end tooth flange which is used for increasing the area of the lower end face of the second nut;
the end tooth flange is annular and is provided with an internal thread matched with the second thread;
one surface of the end tooth flange is tightly attached to the lower end surface of the second nut to be integrally formed, a plurality of second helical teeth are uniformly arranged on the other surface of the end tooth flange in the circumferential direction, and the second helical teeth are uniformly distributed along the circumferential direction of the end tooth flange in an inclined step shape;
the first helical teeth and the second helical teeth are meshed with each other and used for preventing the first nut and the second nut from loosening.
In the lockbolt nut as described above, preferably, the width of the first helical teeth is the same as the width of the second helical teeth.
In the above anti-loose bolt nut, as a preferred scheme, the upper end of the second nut is provided with an elongated section, and the elongated section is used for improving the anti-loose effect;
the lengthened end is provided with an internal thread matched with the second thread, and the lengthened section is connected with the second thread on the screw rod;
preferably, the outer diameter of the elongated section is smaller than the outer diameter of the second nut.
In the lockbolt nut described above, preferably, the first thread is a right-hand thread, and the second thread is a left-hand thread.
In the above anti-loose bolt nut, as a preferable scheme, the thread rotation direction of the first helical teeth is the same as that of the first nut, and from top to bottom, in the clockwise direction, the front ends of the first helical teeth are higher than the rear ends;
the rotation direction of the threads of the second helical teeth is the same as that of the threads of the second nut, and the front ends of the second helical teeth are higher than the rear ends of the second helical teeth from bottom to top in the clockwise direction.
In the lockbolt nut described above, preferably, the first thread is a left-hand thread, and the second thread is a right-hand thread.
In the above anti-loose bolt nut, as a preferable scheme, the thread rotation direction of the first helical teeth is the same as the thread rotation direction of the first nut, and from top to bottom, in the counterclockwise direction, the front end of the first helical teeth is higher than the rear end;
the rotation direction of the threads of the second helical teeth is the same as that of the threads of the second nut, and the front ends of the second helical teeth are higher than the rear ends of the second helical teeth from bottom to top in the counterclockwise direction.
Compared with the closest prior art, the technical scheme provided by the invention has the following excellent effects:
the anti-loosening bolt nut is simple in structure and convenient to operate, the right-handed threads and the left-handed threads are arranged on the stepped screw rod and are respectively matched and connected with the right-handed nuts and the left-handed nuts, the two nuts with opposite rotation directions are mutually matched to play an anti-loosening effect, the connecting ends of the two nuts are respectively provided with the helical teeth, and the helical teeth are mutually meshed, so that the locking force between the two nuts is greatly enhanced, and the connected parts can be tightly pressed together under the action of pre-tightening force.
The anti-loosening bolt and nut provided by the invention is provided with an anti-loosening permanent self-locking structure, so that the bolt connection is permanently, stably and firmly ensured, and the problem of bolt loosening caused by alternate strain generated by external disturbance factors such as alternating load or equipment vibration is solved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic structural view of a bolt according to an embodiment of the present invention;
fig. 2 is a sectional view of a lockbolt nut in embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of a first nut with first helical teeth according to an embodiment of the present invention;
FIG. 4 is a schematic structural view of a second nut with second helical teeth according to an embodiment of the present invention;
fig. 5 is a sectional view of a lockbolt nut in embodiment 2 of the present invention;
fig. 6 is a schematic structural view of a second nut provided with second helical teeth according to embodiment 3 of the present invention;
fig. 7 is a sectional view of a lockbolt nut in embodiment 3 of the invention;
fig. 8 is a perspective view of a lockbolt nut in embodiment 3 of the present invention.
In the figure: 1. a bolt; 101. a fixed end; 102. a screw; 103. a tool withdrawal groove; 1021. a first thread; 1022. a second thread; 2. a connected member; 3. a first nut; 301. a first helical tooth; 4. a second nut; 401. a second helical tooth; 402. an end tooth flange; 403. and (5) lengthening the section.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
Example 1
As shown in fig. 1-2, the present embodiment provides a lockbolt nut, including a bolt 1, a first nut 3 and a second nut 4, where the bolt 1 includes a fixed end 101 and a threaded rod 102, the threaded rod 102 is provided with a first thread 1021 and a second thread 1022, and the thread rotation directions of the first thread 1021 and the second thread 1022 are opposite; the screw 102 penetrates into the connected piece 2 and is screwed into the first nut 3 and the second nut 4 in sequence to enable the connected piece 2 to be tightly attached to the fixed end 101; the first nut 3 is provided with an internal thread matched with the first thread 1021, and the first nut 3 is connected with the first thread 1021 on the screw 102; the second nut 4 is provided with an internal thread which is matched with the second thread 1022, and the second nut 4 is coupled with the second thread 1022 on the screw rod 102; the first thread 1021 has a nominal diameter that is greater than a nominal diameter of the second thread 1022.
In practical applications, the rotation directions of the first screw thread 1021 and the second screw thread 1022 are opposite, where the first screw thread 1021 may be a right-handed screw thread or a left-handed screw thread, and then the second screw thread 1022 is a left-handed screw thread or a right-handed screw thread; the first thread 1021 is close to the fixed end 101 of the bolt 1, the first thread 1021 is a large-specification thread, the second thread 1022 is a small-specification thread, that is, the nominal diameter of the first thread 1021 must be larger than the nominal diameter of the second thread 1022, so that the first nut 3 can be screwed into the screw 102 first, the first nut is fixed by the connecting piece 2, and then the second nut 4 is screwed into the first nut 3, and the first nut 3 and the second nut 4 are opposite in screwing direction, so that the nut is prevented from loosening.
Preferably, the first nut has a height which is greater than the height of the second nut.
In practical application, as shown in fig. 2, the height of the first nut is greater than that of the second nut, because the first nut mainly bears pre-tightening force, the force required to be borne by the first nut is greater, and more threads are required to bear the first nut, and the second nut is arranged for preventing the first nut from being loosened due to the reverse rotation, and the force borne by the second nut is smaller, and the second nut can be borne by fewer threads. If in practical application, the first nut and the second nut are made to be equal in height, the outer diameter of the second nut is smaller than that of the first nut, the second nut is screwed, the pretightening force is completely borne by the second nut, and the first nut only plays a role of a washer, namely, the first nut and the second nut cannot play a role in preventing looseness.
Fig. 2 is a schematic structural diagram of the bolt 1, in which a relief 103 is provided at a connection between the first thread 1021 and the second thread 1022, and the relief 103 is in a rounded transition. The tool withdrawal groove 103 is provided to facilitate tool withdrawal during machining and to ensure that the tool is in close contact with adjacent parts during assembly.
Example 2
The embodiment provides a lockbolt nut, which comprises a bolt 1, a first nut 3 and a second nut 4, wherein the bolt 1 comprises a fixed end 101 and a screw 102, the screw 102 is provided with a first thread 1021 and a second thread 1022, and the thread rotating directions of the first thread 1021 and the second thread 1022 are opposite; the screw 102 penetrates into the connected piece 2 and is screwed into the first nut 3 and the second nut 4 in sequence to enable the connected piece 2 to be tightly attached to the fixed end 101; the first nut 3 is provided with an internal thread matched with the first thread 1021, and the first nut 3 is connected with the first thread 1021 on the screw 102; the second nut 4 is provided with an internal thread which is matched with the second thread 1022, and the second nut 4 is coupled with the second thread 1022 on the screw rod 102; the first thread 1021 has a nominal diameter that is greater than a nominal diameter of the second thread 1022.
Preferably, the first nut has a height which is greater than the height of the second nut.
The joint of the first thread 1021 and the second thread 1022 is provided with a relief groove 103, and the relief groove 103 is in a round angle transition.
As shown in fig. 3 and 4, in the embodiment of the present invention, a plurality of first helical teeth 301 are uniformly arranged in the circumferential direction on the upper end surface of the first nut 3, and the plurality of first helical teeth 301 are uniformly arranged in an inclined step shape in the circumferential direction along the upper end surface of the first nut 3; a plurality of second helical teeth 401 are uniformly arranged on the lower end surface of the second nut 4 in the circumferential direction, and the plurality of second helical teeth 401 are uniformly distributed along the lower end surface of the second nut 4 in an inclined step shape in the circumferential direction; the first helical teeth 301 and the second helical teeth 401 are engaged with each other for preventing loosening of the first nut 3 and the second nut 4.
The number of the first helical teeth 301 is the same as that of the second helical teeth 401, and the first helical teeth 301 and the second helical teeth 401 are meshed with each other to increase the locking force between the first nut 3 and the second nut 4; due to the different size of the first nut 3 and the second nut 4, the width of the first helical teeth 301 is larger than the width of the second helical teeth 401. The widths of the first helical teeth 301 and the second helical teeth 401 are both the length of the helical teeth perpendicular to the circumferential direction.
In the present embodiment, the first thread 1021 is a right-hand thread and the second thread 1022 is a left-hand thread. The thread rotating direction of the first helical tooth 301 is the same as that of the first thread 1021, and the front end of the first helical tooth 301 is higher than the rear end in the clockwise direction from top to bottom; the thread rotation direction of the second helical teeth 401 is the same as the thread rotation direction of the second threads 1022, and the front ends of the second helical teeth 401 are higher than the rear ends in the clockwise direction from bottom to top.
In the present embodiment, the first thread 1021 is a left-hand thread and the second thread 1022 is a right-hand thread. The thread rotating direction of the first helical tooth 301 is the same as the thread direction of the first thread 1021, and the front end of the first helical tooth 301 is higher than the rear end in the counterclockwise direction from top to bottom; the thread rotation direction of the second helical teeth 401 is the same as the thread direction of the second threads 1022, and the front ends of the second helical teeth 401 are higher than the rear ends in the counterclockwise direction from bottom to top.
Preferably, the tooth height of the first helical tooth is greater than the ratio of the pitch of the first nut to the number of teeth.
As shown in fig. 5, which is a cross-sectional view of the anti-loose bolt nut in this embodiment, in practical application, after the screw 102 penetrates into the connected component 2, the first nut 3 is screwed into the first thread 1021, the first nut 3 is close to the fixed end 101 of the bolt 1, the first helical tooth 301 is located on the upper end surface of the first nut 3, and then the second nut 4 is screwed into the second thread 1022, the second helical tooth 401 is located on the lower end surface of the second nut 4, the first helical tooth 301 and the second helical tooth 401 are just meshed with each other, and the first nut 3 and the second nut 4 are tightly fixed together by the connected component 2. When the first thread 1021 is a right-handed thread and the second thread 1022 is a left-handed thread, the first nut 3 needs to be rotated counterclockwise when being screwed outwards, the first helical teeth 301 abut against the second helical teeth 401, and the first nut 3 drives the second nut 4 to rotate counterclockwise to lock the first nut 3; when the second nut 4 is screwed clockwise and outwards, the first helical teeth 301 abut against the second helical teeth 401, and the first nut 3 prevents the second nut 4 from rotating. When the first thread 1021 is a left-hand thread and the second thread 1022 is a right-hand thread, the first nut 3 is a left-hand nut and the second nut 4 is a right-hand nut, and the principle of the nut anti-loosening permanent self-locking is the same as the above.
Example 3
The embodiment provides a lockbolt nut, which comprises a bolt 1, a first nut 3 and a second nut 4, wherein the bolt 1 comprises a fixed end 101 and a screw 102, the screw 102 is provided with a first thread 1021 and a second thread 1022, and the thread rotating directions of the first thread 1021 and the second thread 1022 are opposite; the screw 102 penetrates into the connected piece 2 and is screwed into the first nut 3 and the second nut 4 in sequence to enable the connected piece 2 to be tightly attached to the fixed end 101; the first nut 3 is provided with an internal thread matched with the first thread 1021, and the first nut 3 is connected with the first thread 1021 on the screw 102; the second nut 4 is provided with an internal thread which is matched with the second thread 1022, and the second nut 4 is coupled with the second thread 1022 on the screw rod 102; the first thread 1021 has a nominal diameter that is greater than a nominal diameter of the second thread 1022.
Preferably, the first nut has a height which is greater than the height of the second nut.
In the embodiment, the relief groove 103 is disposed at the connection between the first thread 1021 and the second thread 1022, and the relief groove 103 is in a rounded transition.
As shown in fig. 3 and 6, in the present embodiment, a plurality of first helical teeth 301 are uniformly arranged in the circumferential direction on the upper end surface of the first nut 3, and the plurality of first helical teeth 301 are uniformly arranged in an inclined step shape in the circumferential direction along the upper end surface of the first nut 3; the lower end face of the second nut 4 is provided with an end tooth flange 402, and the end tooth flange 402 is used for increasing the area of the lower end face of the second nut 4; the end tooth flange 402 is annular, and the end tooth flange 402 is provided with internal threads matched with the second threads 1022; one surface of the end tooth flange 402 is tightly attached to the lower end surface of the second nut 4 to be integrally formed, a plurality of second helical teeth 401 are uniformly arranged on the other surface of the end tooth flange 402 in the circumferential direction, and the plurality of second helical teeth 401 are uniformly distributed along one surface of the end tooth flange in an inclined step shape in the circumferential direction; the first helical teeth 301 and the second helical teeth 401 are engaged with each other for preventing the first nut 3 and the second nut 4 from being loosened.
In the present embodiment, the width of the first helical tooth 301 is the same as the width of the second helical tooth 401. The widths of the first helical teeth 301 and the second helical teeth 401 are both the length of the helical teeth perpendicular to the circumferential direction.
Because the specifications of the first nut 3 and the second nut 4 are different, the end surfaces of the first nut 3 and the second nut 4 are respectively provided with the same number of helical teeth, the width of the first helical teeth 301 is larger than that of the second helical teeth 401, in order to increase the width of the second helical teeth 401 to enable the width of the second helical teeth 401 to be the same as that of the first helical teeth 301, one surface of an end tooth flange 402 is tightly attached to the lower end surface of the second nut 4 to be integrally formed, the end tooth flange 402 is used for increasing the area of the lower end surface of the second nut 4, the second helical teeth 401 are uniformly arranged on the other surface of the end tooth flange 402 in the circumferential direction, the width of the second helical teeth 401 is the same as that of the first helical teeth 301, and the first helical teeth 301 and the second helical teeth 401 are meshed more tightly.
In this embodiment, the upper end of the second nut 4 is provided with an elongated section 403, and the elongated section 403 is used for improving the anti-loose effect; the elongated end has internal threads that mate with the second threads 1022 and the elongated section 403 couples with the second threads 1022 on the threaded rod 102.
Preferably, the outer diameter of the elongated section is smaller than the outer diameter of the second nut. The extension section is mainly used for increasing the fatigue resistance of the inner thread teeth and effectively reducing the influence of the tool withdrawal groove, and for the threads, the front three rings are always subjected to the largest stress and deformation, namely the threads close to the first nut are subjected to larger stress and are sequentially reduced backwards, so that the outer diameter of the extension section is smaller than that of the second nut, and the arrangement is not only material-saving but also attractive.
In practical application, the lengthened section 403, the second nut 4, the end tooth flange 402 and the second helical tooth 401 are integrally formed, the end tooth flange 402 is arranged at the lower end of the second nut 4 to increase the width of the second helical tooth 401 so that the second helical tooth 401 can be meshed with the first helical tooth 301 more tightly, the first nut 3 and the second nut 4 are locked more tightly, the lengthened section 403 is arranged at the upper end of the second nut 4, the internal thread of the lengthened section 403 is the same as that of the second nut 4, the lengthened section 403 is matched with the second nut 4, and the connected part 2 is locked under the action of a pre-tightening force, so that the permanent anti-loosening effect is achieved. Wherein the total length of the second thread segments is greater than the total length of the extension segments 403, the second nut 4 and the end tooth flange 402.
In the present embodiment, the first thread 1021 is a right-hand thread and the second thread 1022 is a left-hand thread.
The thread rotating direction of the first helical tooth 301 is opposite to that of the first thread 1021, and the front end of the first helical tooth 301 is higher than the rear end in the clockwise direction from top to bottom; the thread rotation direction of the second helical teeth 401 is opposite to the thread rotation direction of the second threads 1022, and the front ends of the second helical teeth 401 are higher than the rear ends in the clockwise direction from bottom to top.
In the present embodiment, the first thread 1021 is a left-hand thread and the second thread 1022 is a right-hand thread.
The thread rotating direction of the first helical tooth 301 is opposite to the thread direction of the first thread 1021, and the front end of the first helical tooth 301 is higher than the rear end in the counterclockwise direction from top to bottom; the thread rotating direction of the second helical teeth 401 is opposite to the thread direction of the second threads 1022, and the front ends of the second helical teeth 401 are higher than the rear ends in the counterclockwise direction from bottom to top.
As shown in fig. 7 and 8, which are a sectional view and a perspective view of the lockbolt nut of the present embodiment, in practical use, when being installed, after the screw 102 penetrates into the connected piece 2, the first nut 3 is screwed into the first thread 1021, the first nut 3 is close to the fixed end 101 of the bolt 1, the first helical tooth 301 is positioned on the upper end surface of the first nut 3, then, the second nut 4 is screwed into the second thread 1022, the second helical teeth 401 are located on the lower end surface of the second nut 4, since the lower end of the second nut 4 is provided with the end-tooth flange 402 to increase the area of the lower end surface of the second nut 4, the width of the second helical teeth 401 is the same as that of the first helical teeth 301, the first helical teeth 301 on the upper end surface of the first nut 3 are completely matched and buckled with the second helical teeth 401 on the tooth flange 402 at the lower end of the second nut 4, the two are engaged more tightly, since the first nut 3 and the second nut 4 are opposite in rotation, the two nuts will be tightly fixed together by the connecting member 2.
When the first thread 1021 is a right-handed thread and the second thread 1022 is a left-handed thread, the first nut 3 needs to be rotated counterclockwise when being screwed outwards, the first helical teeth 301 abut against the second helical teeth 401, and the first nut 3 drives the second nut 4 to rotate counterclockwise to lock the first nut 3; when the second nut 4 is screwed clockwise and outwards, the first helical teeth 301 abut against the second helical teeth 401, and the first nut 3 prevents the second nut 4 from rotating. When the first thread 1021 is a left-hand thread and the second thread 1022 is a right-hand thread, the first nut 3 is a left-hand nut and the second nut 4 is a right-hand nut, and the principle of the nut anti-loosening permanent self-locking is the same as the above.
In summary, the anti-loosening bolt and nut provided by the invention have simple structure, the connected piece is tightly fixed through two nuts with different rotation directions, the connecting surfaces of the nuts with different rotation directions are respectively provided with the helical teeth, and the first nut and the second nut are mutually matched to play an anti-loosening effect through the meshing effect between the helical teeth, so that a self-loosening permanent self-locking structure is formed, the bolt connection is ensured to be permanently, stable and firm, and the problem of bolt loosening caused by alternate strain generated by external disturbance factors such as alternate load or equipment vibration is solved.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (10)
1. A check bolt nut comprises a bolt, a first nut and a second nut and is characterized in that the bolt comprises a fixed end and a screw, a first thread and a second thread are arranged on the screw, and the rotation directions of the first thread and the second thread are opposite; the screw penetrates into the connected piece and is sequentially screwed into the first nut and the second nut to enable the connected piece to be tightly attached to the fixed end;
the first nut is provided with an internal thread matched with the first thread; the second nut is provided with an internal thread matched with the second thread; the first thread has a nominal diameter greater than a nominal diameter of the second thread.
2. The lockbolt nut of claim 1 wherein the junction of the first thread and the second thread is provided with a relief groove, the relief groove being in a rounded transition.
3. The lockbolt nut of claim 2, wherein the upper end surface of the first nut is uniformly provided with a plurality of first helical teeth in the circumferential direction, and the plurality of first helical teeth are uniformly arranged in an inclined step shape in the circumferential direction of the upper end surface of the first nut;
a plurality of second helical teeth are uniformly arranged on the lower end surface of the second nut in the circumferential direction, and are uniformly distributed along the lower end surface of the second nut in an inclined step shape;
the first helical teeth and the second helical teeth are meshed with each other and used for preventing the first nut and the second nut from loosening.
4. The lockbolt nut of claim 2, wherein the upper end surface of the first nut is circumferentially and uniformly provided with a plurality of first helical teeth, and the first helical teeth are circumferentially and uniformly arranged along the upper end surface of the first nut in an inclined step shape;
the lower end face of the second nut is provided with an end tooth flange which is used for increasing the area of the lower end face of the second nut;
the end tooth flange is annular and is provided with an internal thread matched with the second thread;
one surface of the end tooth flange is tightly attached to the lower end surface of the second nut to be integrally formed, a plurality of second helical teeth are uniformly arranged on the other surface of the end tooth flange in the circumferential direction, and the second helical teeth are uniformly distributed along the circumferential direction of the end tooth flange in an inclined step shape;
the first helical teeth and the second helical teeth are meshed with each other and used for preventing the first nut and the second nut from loosening.
5. The lockbolt nut of claim 4 wherein the width of the first helical teeth is the same as the width of the second helical teeth.
6. The lockbolt nut as claimed in claim 5, wherein the upper end of the second nut is provided with an elongated section for improving the lockbolt effect;
the lengthened end is provided with an internal thread matched with the second thread, and the lengthened section is connected with the second thread on the screw rod;
preferably, the outer diameter of the elongated section is smaller than the outer diameter of the second nut.
7. The lockbolt nut as claimed in any one of claims 3 to 6, wherein the first thread is a right-hand thread and the second thread is a left-hand thread.
8. The lockbolt nut of claim 7, wherein the thread rotation direction of the first helical teeth is the same as the thread rotation direction of the first nut, and the front end of the first helical teeth is higher than the rear end in the clockwise direction from top to bottom;
the rotation direction of the threads of the second helical teeth is the same as that of the threads of the second nut, and the front ends of the second helical teeth are higher than the rear ends of the second helical teeth from bottom to top in the clockwise direction.
9. The lockbolt nut as claimed in any one of claims 3 to 6, wherein the first thread is a left-hand thread and the second thread is a right-hand thread.
10. The lockbolt nut of claim 9 wherein the direction of rotation of the threads of the first helical teeth is the same as the direction of rotation of the threads of the first nut, from top to bottom, in the counterclockwise direction, the front end of the first helical teeth is higher than the rear end;
the rotation direction of the threads of the second helical teeth is the same as that of the threads of the second nut, and the front ends of the second helical teeth are higher than the rear ends of the second helical teeth from bottom to top in the counterclockwise direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397258.9A CN110985516A (en) | 2019-12-30 | 2019-12-30 | Anti-loose bolt and nut |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911397258.9A CN110985516A (en) | 2019-12-30 | 2019-12-30 | Anti-loose bolt and nut |
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| CN110985516A true CN110985516A (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911397258.9A Pending CN110985516A (en) | 2019-12-30 | 2019-12-30 | Anti-loose bolt and nut |
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| CN (1) | CN110985516A (en) |
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| CN111473036A (en) * | 2020-05-15 | 2020-07-31 | 申秀云 | Locking device for locking tongue nut |
| CN111706601A (en) * | 2020-07-29 | 2020-09-25 | 阮万生 | Positive and negative nut assembly structure |
| CN111963651A (en) * | 2020-09-10 | 2020-11-20 | 李闯 | Can prevent protruding structure of gear that twists |
| CN112240334A (en) * | 2020-11-04 | 2021-01-19 | 杨磊 | Anti-loosening expansion bolt |
| CN113417924A (en) * | 2021-07-21 | 2021-09-21 | 三马紧固件(浙江)股份有限公司 | Lightweight high-strength nut for automobile |
| WO2021220240A1 (en) * | 2020-05-01 | 2021-11-04 | Mohlalefi (Pty) Ltd | Nut arrangement, rock bolt and driver apparatus |
| CN113623309A (en) * | 2020-05-09 | 2021-11-09 | 中国石油化工股份有限公司 | Self-locking screw connection structure |
| CN113669343A (en) * | 2021-08-05 | 2021-11-19 | 浙江意动科技股份有限公司 | Compression-resistant and tensile combined bolt |
| CN114439825A (en) * | 2022-02-14 | 2022-05-06 | 天津市天锻压力机有限公司 | Butt nut and butt-joint type pull rod for large hydraulic press |
| CN115076204A (en) * | 2022-05-31 | 2022-09-20 | 鄂尔多斯应用技术学院 | Fastener for aerospace |
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| CN113669343A (en) * | 2021-08-05 | 2021-11-19 | 浙江意动科技股份有限公司 | Compression-resistant and tensile combined bolt |
| CN113669343B (en) * | 2021-08-05 | 2023-09-01 | 安徽长江紧固件有限责任公司 | Compression-resistant and tensile combined bolt |
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| CN114439825B (en) * | 2022-02-14 | 2024-07-26 | 天津市天锻压力机有限公司 | Butt-joint nut and butt-joint pull rod for large hydraulic press |
| CN115076204A (en) * | 2022-05-31 | 2022-09-20 | 鄂尔多斯应用技术学院 | Fastener for aerospace |
| CN115076204B (en) * | 2022-05-31 | 2023-12-26 | 鄂尔多斯应用技术学院 | Fastener for aerospace |
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