Double-nut structure for preventing bolt from loosening

Abstract

The utility model provides a double-nut structure for preventing a bolt from loosening. The double-nut structure comprises the bolt, a fastening nut and a lock nut. The bolt is provided with a first threaded section, one end of the first threaded section is provided with a second threaded section which is coaxially connected with the first threaded section to form an integrated structure, the first threaded section and the second threaded section are provided with external threads with opposite spiral directions, and the outer diameter of the second threaded section is smaller than that of the first threaded section; an inner threaded hole matched with the first threaded section is formed in the inner side of the fastening nut, and the fastening nut is assembled on the outer side of the first threaded section in a threaded mode; in the utility model, the fastening nut and the locknut are in threaded connection with the bolt through the opposite thread structures, and are locked through the lockpiece, so that the opposite thread trends of the fastening nut and the locknut can be counteracted mutually, and the fastening nut and the locknut are prevented from loosening on the bolt; the connection stability is effectively enhanced, and the bolt is prevented from loosening and falling off.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical connection, and particularly relates to a double-nut structure for preventing bolt loosening. Background Art

[0002] In mechanical connections, the combination of bolts and nuts is a common connection method. However, in long-term use or vibration environments, bolts and nuts are prone to loosening or even falling off, affecting the stability and safety of mechanical structures.

[0003] To solve the above problems, some anti-loosening measures have been proposed in the prior art, such as using locking agents, spring washers or adopting special thread designs, etc. However, the anti-loosening effects of these measures are not ideal in practical applications, especially in products that require high reliability.

[0004] Therefore, it is necessary to design a double-nut structure for preventing bolt loosening that can effectively prevent the automatic loosening of bolts and nuts, and improve the reliability and safety of the bolt-nut connection to solve the current technical problems. Summary of the Invention

[0005] Aiming at the deficiencies in the prior art, the utility model provides a double-nut structure for preventing bolt loosening that can effectively prevent the automatic loosening of bolts and nuts, and improve the reliability and safety of the bolt-nut connection.

[0006] The technical solution of the utility model is: a double-nut structure for preventing bolt loosening, including a bolt, a fastening nut and a locknut; the bolt has a first thread section, and one end of the first thread section is provided with a second thread section coaxially connected to form an integral structure therewith. The first thread section and the second thread section have external threads with opposite helix directions, and the outer diameter of the second thread section is smaller than the outer diameter of the first thread section; the inner side of the fastening nut has an internal thread hole matching the first thread section, and the fastening nut is threadedly assembled on the outside of the first thread section; the inner side of the locknut has an internal thread hole matching the second thread section, and the locknut is threadedly assembled on the outside of the second thread section; a groove coaxial with the first thread section is opened on one side of the fastening nut close to the locknut, and a convex ring corresponding to the groove is fixedly arranged on one side of the locknut close to the fastening nut. The outer side of the convex ring is threadedly connected to the inner side of the groove; at least two groups of anti-loosening members for locking or releasing between the locknut and the fastening nut are arranged in a circumferential array on the locknut.

[0007] The anti-loosening member has a through hole opened on the anti-loosening nut, and a fixing rod is assembled inside the through hole; a positioning groove corresponding to the through hole is opened on the fastening nut, a spring is arranged inside the positioning groove, and one end of the spring is fixedly connected to the inside of the positioning groove; one end of the fixing rod is inserted into the inside of the positioning groove, and the end of the fixing rod abuts against the spring; a locking screw for locking or releasing the anti-loosening nut and the fixing rod is arranged on the anti-loosening nut.

[0008] On one side of the anti-loosening nut, a locking hole matching the locking screw is radially opened along the through hole; a locking threaded hole matching the locking screw is opened on one side of the fixing rod.

[0009] The locking hole is a hole passage opened on the side surface of the anti-loosening nut and communicating with the through hole, and the diameter of the locking hole is equal to the diameter of the locking screw.

[0010] The positioning groove is a blind hole opened on the fastening nut, and the diameter of the positioning groove is equal to the diameter of the fixing rod.

[0011] The beneficial effects of the present utility model:

[0012] In the present utility model, the fastening nut and the anti-loosening nut are threadedly connected to the bolt through opposite thread structures, and at the same time, the fastening nut and the anti-loosening nut are locked through the anti-loosening member. The opposite thread trends of the fastening nut and the anti-loosening nut will cancel each other out, preventing the fastening nut and the anti-loosening nut from loosening on the bolt, effectively enhancing the connection stability, and preventing the bolt from loosening and falling off. Description of the drawings

[0013] Figure 1 It is a schematic external structure diagram of the double-nut structure for preventing bolt loosening in the present utility model.

[0014] Figure 2 It is a schematic internal structure diagram of the double-nut structure for preventing bolt loosening in the present utility model.

[0015] Figure 3 It is a schematic internal structure diagram of the anti-loosening nut in the present utility model.

[0016] Figure 4 It is a schematic structure diagram of the bolt in the present utility model. Detailed implementation manners

[0017] Various exemplary embodiments of the present utility model will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended as any limitation on the present utility model and its application or use. The present utility model can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present utility model thorough and complete and to fully convey the scope of the present utility model to those skilled in the art. It should be noted that: unless otherwise specifically stated, the relative arrangements of components and steps, the compositions of materials, numerical expressions and values set forth in these embodiments should be construed as merely exemplary and not as limitations.

[0018] The terms "first", "second" and similar terms used in the present utility model do not denote any order, quantity or importance, but are only used to distinguish different parts. Words such as "comprising" or "including" mean that the elements preceding the word cover the elements listed after the word, and do not exclude the possibility of also covering other elements. Terms such as "upper", "lower", "left", "right" are only used to indicate relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0019] As Figures 1 to 4As shown, a double-nut structure for preventing bolt loosening includes a bolt 3, a fastening nut 1, and a locking nut 2; the bolt 3 has a first threaded section 31, and one end of the first threaded section 31 is provided with a second threaded section 32 coaxially connected to it as an integral structure. The first threaded section 31 and the second threaded section 32 have external threads with opposite helix directions, and the outer diameter of the second threaded section 32 is smaller than the outer diameter of the first threaded section 31; the inner side of the fastening nut 1 has an internal threaded hole matching the first threaded section 31, and the fastening nut 1 is threadedly assembled on the outside of the first threaded section 31; the inner side of the locking nut 2 has an internal threaded hole matching the second threaded section 32, and the locking nut 2 is threadedly assembled on the outside of the second threaded section 32; a groove 11 coaxial with the first threaded section 31 is formed on one side of the fastening nut 1 close to the locking nut 2, and a convex ring 21 corresponding to the groove 11 is fixedly arranged on one side of the locking nut 2 close to the fastening nut 1, and the outside of the convex ring 21 is threadedly connected to the inside of the groove 11; at least two groups of locking parts for locking or releasing between the locking nut 2 and the fastening nut 1 are arranged in a circumferential array on the locking nut 2; in this embodiment, taking the direction of screwing the fastening nut 1 onto the first threaded section 31 as the forward screwing direction, during installation, first pass the bolt 3 through the component to be fixed, and then install the fastening nut 1 on the first threaded section 31 along the forward screwing direction to achieve fastening; subsequently, install the locking nut 2 on the second threaded section 32 along the reverse screwing direction. When screwing the locking nut 2 in the reverse direction, the convex ring 21 is threadedly assembled into the inside of the groove 11, and then the locking nut 2 and the fastening nut 1 are locked through the locking parts; at this time, the opposite thread trends of the fastening nut 1 and the locking nut 2 will cancel each other out, preventing the fastening nut 1 and the locking nut 2 from loosening on the bolt 3.

[0020] In some embodiments, as a specific implementation manner of the anti-loosening member, the anti-loosening member has a through hole 22 formed in the anti-loosening nut 2, and a fixing rod 4 is assembled inside the through hole 22; a positioning groove 12 corresponding to the through hole 22 is formed in the fastening nut 1, and a spring 6 is arranged inside the positioning groove 12. One end of the spring 6 is fixedly connected to the inside of the positioning groove 12; one end of the fixing rod 4 is inserted into the inside of the positioning groove 12, and the end of the fixing rod 4 abuts against the spring 6; a locking screw 5 is arranged on the anti-loosening nut 2 for locking or releasing the connection between the anti-loosening nut 2 and the fixing rod 4; the fixing rod 4 passes through the through hole 22 of the anti-loosening nut 2, and the end of the fixing rod 4 is inserted into the inside of the positioning groove 12. Then, the fixing rod 4 is locked with the anti-loosening nut 2 through the locking screw 5, so that the fixing rod 4 remains in the state of being inserted into the positioning groove 12. The fixing rod 4 is inserted into the positioning groove 12 to connect the fastening nut 1 and the anti-loosening nut 2 together. Thus, the opposite thread trends of the fastening nut 1 and the anti-loosening nut 2 will cancel each other out, preventing the fastening nut 1 and the anti-loosening nut 2 from loosening on the bolt 3; at the same time, the end of the fixing rod 4 compresses the spring 6, and the spring 6 provides opposite acting forces along the axial direction of the bolt 3 to the fastening nut 1 and the anti-loosening nut 2 respectively, further improving the stability of the whole structure and enhancing the anti-loosening effect.

[0021] In some embodiments, a locking hole 23 matching the locking screw 5 is formed in one side of the anti-loosening nut 2 along the radial direction of the through hole 22; a locking threaded hole 41 matching the locking screw 5 is formed in one side of the fixing rod 4; after the fixing rod 4 is inserted into the positioning groove 12, the locking threaded hole 41 is adjusted to correspond to the locking hole 23, and then the locking screw 5 is installed into the locking hole 23, and the fixing rod 4 is locked with the anti-loosening nut 2 through the locking screw 5.

[0022] In some embodiments, the locking hole 23 is a hole channel formed on the side surface of the anti-loosening nut and communicating with the through hole 22, and the diameter of the locking hole 23 is equal to the diameter of the locking screw 5. Thus, the locking screw 5 can slide axially along the locking hole 23 and be inserted into it, and the locking screw 5 is screwed to be in threaded connection with the locking threaded hole 41.

[0023] In some embodiments, the positioning groove 6 is a blind hole formed in the fastening nut, and the diameter of the positioning groove 6 is equal to the diameter of the fixing rod 4.

[0024] So far, the embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details well known in the art are not described. Those skilled in the art can clearly understand how to implement the technical solutions disclosed here based on the above description.

[0025] The above-described embodiments only represent some implementation manners of the present utility model. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model patent shall be subject to the appended claims.

Claims

1. A double-nut structure for preventing bolt loosening, characterized in that it includes a bolt, a fastening nut and a locknut; the bolt has a first threaded section, one end of the first threaded section is provided with a second threaded section coaxially connected and integrated therewith, the first threaded section and the second threaded section have external threads with opposite helix directions, and the outer diameter of the second threaded section is smaller than the outer diameter of the first threaded section; the inner side of the fastening nut has an internal threaded hole matching the first threaded section, and the fastening nut is threadedly assembled outside the first threaded section; the inner side of the locknut has an internal threaded hole matching the second threaded section, and the locknut is threadedly assembled outside the second threaded section; a groove coaxial with the first threaded section is formed on one side of the fastening nut close to the locknut, a convex ring corresponding to the groove is fixedly arranged on one side of the locknut close to the fastening nut, and the outer side of the convex ring is threadedly connected with the inner side of the groove; at least two groups of lock prevention parts for locking or releasing between the locknut and the fastening nut are arranged in a circumferential array on the locknut.

2. The double-nut structure for preventing bolt loosening according to claim 1, wherein: The lock prevention part has a through hole formed on the locknut, and a fixing rod is assembled inside the through hole; a positioning groove corresponding to the through hole is formed on the fastening nut, a spring is arranged inside the positioning groove, and one end of the spring is fixedly connected with the inside of the positioning groove; one end of the fixing rod is inserted into the inside of the positioning groove, and the end of the fixing rod abuts against the spring; a locking screw for locking or releasing between the locknut and the fixing rod is arranged on the locknut.

3. The double-nut structure for preventing bolt loosening according to claim 2, characterized in that: a locking hole matching the locking screw is formed on one side of the locknut along the radial direction of the through hole; a locking threaded hole matching the locking screw is formed on one side of the fixing rod.

4. The double-nut structure for preventing bolt loosening according to claim 3, characterized in that: The locking hole is a hole channel formed on the side of the locknut and communicating with the through hole, and the diameter of the locking hole is equal to the diameter of the locking screw.

5. The double-nut structure for preventing bolt loosening according to claim 2, wherein: The positioning groove is a blind hole formed on the fastening nut, and the diameter of the positioning groove is equal to the diameter of the fixing rod.

Images