CN207795812U - A kind of combination stop nut and coupling structure using tapered thread locking - Google Patents

Abstract

The utility model relates to the technical field of fasteners, in particular to a combination anti-loosening nut and a connection structure locked by tapered threads. A combined anti-loosening nut locked by tapered thread, comprising a nut body with an internal thread for locking a screw rod and a lock nut matched therewith, characterized in that the lock nut has a tapered internal thread ; The nut body has an external thread, and the part of the nut body with the external thread is provided with an axial contraction groove. The combined anti-loosening nut has excellent anti-loosening ability even under high-frequency vibration, and is practical and widely applicable.

Description

Combination anti-loosening nut and connection structure locked by tapered thread

technical field

The utility model relates to the technical field of fasteners, in particular to a combination anti-loosening nut and a connection structure locked by tapered threads.

Background technique

In actual work, screws and nuts are often used to fix more than two joints. However, when the external load has vibration, change, and high-temperature creep of the material, the friction between the threaded connections will be reduced, and the normal pressure in the threaded connection will be It disappears at a certain moment, and the friction force is 0, so that the threaded connection becomes loose. If it is repeatedly used, the threaded connection will loosen and fail. Therefore, anti-loosening must be carried out, otherwise it will affect the normal work and cause accidents. It can be seen that anti-loosening has two principles: one is to eliminate (or limit) the relative movement between thread pairs, and the other is to increase the difficulty of relative movement.

In the prior art, there are several ways to prevent loosening of threads: 1. Use additional friction to prevent loosening, such as adding spring washers, nylon rings, using counter nuts, etc.; 2. Using special anti-loosening components to prevent loosening, such as Slotted nuts and cotter pins, round nuts with finned washers, stop washers, etc.; 3. Use adhesive to bond and prevent loosening. In actual use, these three methods have a narrow scope of application and are extremely vulnerable to damage.

Patent No. CN201510247155 discloses such a self-locking anti-loosening nut, including a main nut and a lock nut, characterized in that: the main nut includes a main body and a locking part, and the lock nut is connected to the lock nut. The locking part is suitable; wherein, the locking part includes an external vertebral body and an external screw rod located between the external vertebral body and the main body, and the internal thread of the locking part and the internal thread of the main body Continuous and consistent; an annular arc-shaped groove is arranged at the connection between the outer vertebral body and the outer screw rod, 8-12 axial grooves are uniformly arranged on the outer vertebral body, and the axial grooves and the A hole is provided at the joint of the annular groove; a thread that matches the external thread of the external screw is provided at the internal front end of the lock nut, and the internal rear end is an internal thread that is compatible with the external vertebral body. vertebral body.

This anti-loosening nut utilizes the cooperation of the outer vertebral body of the locking part and the outer thread of the outer screw rod with the inner vertebral body and the inner thread of the lock nut and the axial slotting to achieve the purpose of anti-loosening. There is no thread on the side of the external vertebral body and the internal vertebral body. The external thread and the internal thread are both straight threads. After the straight threads cooperate with each other to form a thread pair, the force on the external thread is upward, and the force on the internal thread is downward. There is a gap between the threads; when locking, the internal thread and the external thread are subjected to axial unilateral pressure, and the taper of the inner vertebral body is also subject to the unidirectional tension of the thread, resulting in unilateral clearance and tension when the thread is locked. In the case of vibration, the lock nut will loosen due to the gap and the pulling force of the screw, which will cause the lock nut to loosen.

Contents of the invention

The utility model aims to solve the above problems by providing a combination anti-loosening nut that uses tapered threads to lock. When the combination anti-loosening nut is locked, there is relatively no gap between the threaded connections of the locking parts, and there is no gap between the screw threads in the axial direction of the screw rod. There is no tension or pressure, so even under high-frequency vibration, it is difficult for the relative movement between the threads to occur, and it has excellent anti-loosening ability.

The technical scheme for solving the problem of the utility model is to provide a combined anti-loosening nut that uses a tapered thread to lock, including a nut body with an internal thread for locking the screw rod and a lock nut that cooperates with it, and is characterized in that : the lock nut has a tapered internal thread; the nut body has an external thread, and the part of the nut body with the external thread is provided with an axial contraction groove.

Preferably, the nut body includes a fastening portion and a locking portion disposed on the fastening portion, the external thread is disposed on an outer surface of the locking portion, and the contraction groove is opened on the locking portion.

Preferably, the external thread is a straight thread or a tapered thread.

Preferably, the end of the external thread has an annular circumferential groove, and the bottom of the circumferential groove is deeper or equal to the thread bottom of the end of the external thread.

Preferably, the unilateral taper of the tapered internal thread is greater than or equal to that of the external thread.

Preferably, the unilateral taper of the external thread of the locking part is 0°-15°.

Preferably, the unilateral taper of the external thread of the locking part is 1°-10°.

Preferably, the unilateral taper of the external thread of the locking part is 1°-6°.

Preferably, the unilateral taper of the external thread of the locking part is 1.5°-5°.

Preferably, the unilateral taper of the external thread of the locking part is 1.5°-3°.

Preferably, the unilateral taper of the tapered internal thread of the lock nut is 1°-30°.

Preferably, the unilateral taper of the tapered internal thread of the lock nut is 1°-10°.

Preferably, the unilateral taper of the tapered internal thread of the lock nut is 1.5°-5°.

Preferably, the unilateral taper of the tapered internal thread of the lock nut is 2°-3°.

Preferably, there are 1-10 shrink grooves.

Preferably, there are 2-8 shrink grooves.

Preferably, there are 4-6 shrink grooves.

Preferably, the shrinking end face of the shrinking groove is flush with the end face of the locking part, and the connecting end face of the shrinking groove is flush with the connecting surface between the fastening part and the locking part.

Another object of the present utility model is to provide an anti-loosening thread connection structure, which is characterized in that: it includes a main body with a shrinkage groove and an external thread and an internal thread, the external thread is connected with a tapered internal thread, and the internal thread The thread is connected with the external thread of the screw rod.

The beneficial effects of the utility model:

1. The cooperation between the tapered internal thread and the external thread makes at least one circle of thread at the connection between the threads close to each other, thus ensuring the initial tightness.

2. Lock nut When the nut body is locked, the locking part is retracted inward by the gradually tightening force of the tapered internal thread, thereby tightening the screw rod connected with its internal thread to achieve the locking effect between the nut body and the screw rod.

3. On the basis of the initial tight connection, the locking part elastically expands under the reaction of the contraction groove, and the external thread is subjected to an outward elastic expansion force, and under the force of the tapered internal thread, the tapered internal thread and the external thread Each circle of threads at the connection between the threads has achieved the effect of "seizure", thereby ensuring the effect of no gap between the two sides of the locking part, and achieving the effect of locking between the lock nut and the nut body.

4. The locking effect between the nut main body and the screw rod and the lock nut, as well as the elastic contraction and expansion effects of the contraction part, make the whole structure even under high-frequency vibration, the lock nut and the nut main body, the nut body and the screw rod. The threaded joints between them always maintain a tight and gap-free occlusal state, and will not loosen due to relative movement due to external forces.

5. After the nut body is assembled on the screw rod, when the lock nut is not assembled, the nut body can be screwed on any part of the screw rod; after the lock nut is assembled, the combined anti-loosening nut is locked and fixed on this position to achieve hovering locking effect; the combination locknut can be used for locking any part of the screw rod, and has strong practicability.

6. The internal thread of the nut body can be made into any size to match the corresponding screw rod, and has a wide range of applications.

Description of drawings

Fig. 1 is a schematic diagram of the structure of a combined anti-loosening nut that utilizes tapered thread locking before connection;

Fig. 2 is a schematic diagram of the structure of a combined locking nut that is locked by a tapered thread;

Fig. 3 is a force analysis diagram of a combination locknut locked by tapered threads;

In the figure: 100-nut body, 101-internal thread, 110-locking part, 111-external thread, 112-circumferential groove, 113-shrink groove, 120-fastening part, 200-lock nut, 210-taper internal thread.

Detailed ways

The following are specific embodiments of the utility model, and in conjunction with the accompanying drawings, the technical solution of the utility model is further described, but the utility model is not limited to these embodiments.

Example 1

A combined anti-loosening nut that uses tapered threads to lock, as shown in Figure 1 and Figure 2, this combined anti-loosening nut can be used to fasten and prevent loosening of screws of any structure and at any part of them. It comprises a nut body 100 and a jam nut 200 cooperating with each other.

The lock nut 200 has an internal thread, and the internal thread is a tapered internal thread 210 .

The nut main body 100 includes an integrally formed locking part 110 and a fastening part 120 from top to bottom. Both the locking part 110 and the fastening part 120 have internal threads 101, and the internal threads of the locking part 110 and the fastening part 120 Thread 101 is continuous and consistent. The locking part 110 also has an external thread 111, and there is an annular circumferential groove 112 at the connection between the end of the external thread 111 and the fastening part 120, and the bottom of the circumferential groove 112 is deeper than the thread bottom of the end of the external thread 111 of the locking part 110. . The locking part 110 is provided with an axial shrinkage groove 113, and the shrinking end surface of the shrinking groove 112 is flush with the free end surface of the locking part 110, and the connecting end surface of the groove bottom and the fastening part 120 and the locking part 110 Connecting surfaces are flush.

Specifically, the parameters of the combined anti-loosening nut are: the fastening part 120 is an outer hexagonal nut with an opposite side of 25 mm and a height of 10 mm. The total height of the locking part 110 is 11mm; the cone taper of the external thread 111 is 4°, the outer diameter of the small end is 13mm, and the pitch is 0.5mm; the groove depth diameter of the circumferential groove 112 is 13mm, and the groove width is 3mm; the shrinkage groove 113 adopts cross grooves, that is, 4 grooves, the groove width is 1mm, and the groove depth is 11mm. The lock nut 200 is an outer hexagonal nut with 25mm opposite sides and a height of 10mm. It has a tapered internal thread 210 with a taper of 5°, and the outer diameter of the small end of the tapered internal thread 210 is 12.5mm.

The implementation principle of the utility model is as follows: first pass the threaded main body 100 through its internal thread 101 and use the fastening part 120 as a wrench end to tighten on the part of the screw rod that needs to be fastened and anti-loosening, and then pass the lock nut 200 through its tapered inner thread. The cooperation of the thread 210 and the external thread 111 on the thread body 100 is coupled with the fastening part 110 .

As shown in Figure 3: during the process of tightening the locking part 110 of the lock nut 200, due to the existence of the tapered internal thread 210, a force F1 will be generated to the nut body 100, and due to the existence of the contraction groove 113 and the circumferential groove 112, F1 enables the locking part 110 to be folded inward and shrink from the circumferential direction, so that the locking part 110 can generate a circumferential clamping force F3 on the screw rod connected through the internal thread 101 in the nut body 100, and obtain a gap between the nut body 100 and the screw rod. Tightening effect. And because the contraction groove 113 itself has the tendency of outward recovery and resistance to shrinking, it has a reaction force F2. Under the action of F1 and F2, the lock nut 200 and the nut body 100 are also tightly combined, and the lock nut 200 pairs The nut body has relatively no tension and pressure in the axial direction of the screw, so as to achieve excellent anti-loosening effect.

In particular, in the prior art, there is a kind of "conical thread". The conical thread has a dry sealing effect. The principle of the sealing effect is: after the conical thread is connected, there is always a group of threads that are just in close contact so as to ensure Sealing, that is to say, one of the characteristics of tapered threads is that at least one thread at the joint is tight, and the meshing part is the sealing part. It is different from the utility model in that the elastic contraction of the tapered thread and the contraction groove obtains completely gap-free engagement so as to achieve the anti-loosening effect.

This embodiment is used in the actual test, using the grinder as the test platform. In this experiment, after fastening with the locknut combination with tapered thread, turn the grinder in reverse. In the case of reverse drive, Vibration and grinding, no looseness for a long time. The anti-loosening effect is very obvious.

Example 2

The structure of this embodiment is basically the same as that of the above embodiment, the only difference is that the specific parameters of the combination locknut locked by tapered thread in this embodiment are different, and the similarities in structure will not be described in detail.

In this embodiment, the groove bottom of the circumferential groove 112 is flush with the end thread bottom of the external thread 111 of the locking part 110, and the specific parameters are: M12 standard screw is used as the implementing screw. The fastening part 120 of the nut body 100 is an outer hexagonal nut with 5 mm opposite sides and a height of 10 mm; the total height of the locking part 110 is 15 mm, and the taper of the external thread 111 is 0°, which is a straight thread, and the outer diameter is 17mm, the pitch is 1mm; the groove depth diameter of the circumferential groove 112 is 15.5mm, and the groove width is 3mm; the contraction groove 113 adopts cross grooves, that is, 4 grooves, the groove width is 1mm, and the groove depth diameter is 15mm. The locking nut 200 is an external hex nut with 25 mm opposite sides and a height of 10 mm. The outer diameter of the small end of the tapered internal thread 210 is 16.5 mm, which is 0.5 mm smaller than the locking part 110, and the taper of the cone is 3.5°.

In this embodiment, the anti-loosening nut combination with tapered thread is screwed onto the M12 standard screw rod, so that between the lock nut 200 and the nut body 100, and between the nut body 100 and the screw rod, it is like a "hoop" to embrace and bidirectional The "wedge" is generally wedged, achieving the purpose of preventing loosening.

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (10)

1. A combined anti-loosening nut that utilizes tapered thread locking, including a nut body (100) with an internal thread (101) for locking the screw rod and a locking nut (200) that cooperates with it, characterized in that : the lock nut (200) has a tapered internal thread (210); the nut body (100) has an external thread (111), and the part of the nut body (100) with the external thread (111) is provided with Axial shrink groove (113). 2. A combined anti-loosening nut with tapered thread locking according to claim 1, characterized in that: the nut body (100) includes a fastening part (120) and is arranged on the fastening part (120) The locking part (110) on the locking part (110), the external thread (111) is arranged on the outer surface of the locking part (110), and the contraction groove (113) is opened on the locking part (110). 3 . The combination locknut locked by tapered thread according to claim 1 , characterized in that: the external thread ( 111 ) is a straight thread or a tapered thread. 4 . 4. A combined anti-loosening nut with tapered thread locking according to claim 1, characterized in that: the end of the external thread (111) has an annular circumferential groove (112), and the circumferential groove (112 ) The groove bottom is deeper or flush with the end thread bottom of the external thread (111). 5. The combination locknut locked by tapered thread according to claim 1, characterized in that: the unilateral taper of the tapered internal thread (210) is greater than or equal to the external thread (111) . 6 . The combination locknut locked by tapered thread according to claim 1 , characterized in that: the unilateral taper of the external thread ( 111 ) is 0°-15°. 7 . The combination locknut locked by tapered thread according to claim 1 , characterized in that: the single side taper of the tapered internal thread ( 210 ) is 1°-30°. 8 . The combination locknut locked by tapered thread according to claim 1 , characterized in that: the number of shrinkage grooves ( 113 ) is 1-10. 9 . 9. A combined anti-loosening nut locked by tapered threads according to claim 2, characterized in that: the end face of the shrinking end of the shrinking groove (113) is flush with the end face of the locking part (110), The connection end surface of the contraction groove (113) is flush with the connection surface between the fastening part (120) and the locking part (110). 10. A coupling structure comprising a combination locknut locked by tapered thread according to any one of claims 1 to 9, characterized in that: it includes a contraction groove (113) and has an external thread (111) and an internal thread (101), the external thread (111) is connected with the tapered internal thread (210), and the internal thread (101) is connected with the external thread of the screw.