Anti-loose thread fastening structure

A technology of fastening structure and anti-loosening nut, applied in the direction of threaded fasteners, locking fasteners, screws, etc., can solve the uneven distribution of extrusion stress, shorten the service life of the screw pair, and fail to improve the screw pair resistance. Force structure and other problems, to avoid rapid wear damage, overcome accelerated wear, and the effect of early weakening of the fastening effect

Inactive Publication Date: 2014-11-12
宁波华路汽车电器有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this invention fails to improve the stress structure of the screw pair, and the extrusion stress distribution between the bolt and the nut is uneven when locking, and the local part will still be fatigued first, thereby shortening the service life of the screw pair

Method used

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  • Anti-loose thread fastening structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Such as figure 1 As shown, an anti-loosening thread fastening structure includes a bolt and a nut that cooperates with the bolt, the bolt is a standard metric bolt, and the thread surface at the root of the internal thread 1 of the nut is provided with a variable-angle slope 2, The remainder of the internal thread 1 is the same as a standard metric nut. The threads on the bolts and nuts are triangular threads, the profile angle is 60°, and the included angle between the variable-angle slope 2 and the bisector of the profile angle of the internal thread 1 is 31.6°.

[0019] When the nut and the bolt in this embodiment are screwed together, because the variable-angle slope 2 occupies part of the screw groove bottom space of the nut, the fit gap is eliminated. The upper thread surface of the thread is limited by the lower thread surface of the nut thread above the bolt thread, so the bolt and the nut will produce strong mutual extrusion at the beginning of cooperation, wh...

Embodiment 2

[0021] Such as figure 2 , image 3 As shown, there are two nuts, including a lock nut 3 and a lock nut 4. The lock nut 3 is mainly used to cooperate with the bolt to exert a tightening force on the fastening object, and the lock nut 4 prevents the lock nut from 3 back, thereby playing a role in strengthening fastening. On the lock nut 3, an axially protruding lock ring 5 is integrally formed in the center of the end face opposite to the lock nut 4. The outer profile of the lock ring 5 gradually narrows from the root to the free end. The inner wall is provided with a thread that continues to the internal thread of the locking nut 3, and the locking ring 5 is provided with three slits 9 radially penetrating the inner and outer walls of the locking ring 5, and the locking ring 5 is divided into three petals, each of which can be For a small deflection, on the locknut 4, an axially concave tightening opening 6 is provided in the center of the end face opposite to the locking nu...

Embodiment 3

[0024] Such as image 3 As shown, there are two nuts, including a lock nut 3 and a lock nut 4, the lock nut 3 is provided with an eccentric concave hole 7, and the eccentric concave hole 7 is located on the end face opposite to the lock nut 4, preventing The loose nut 4 is provided with an eccentric convex ring 8, and the eccentric convex ring 8 is located on the end face opposite to the lock nut 3. The offset distance between the axis of the lock nut 3 and the axis of the lock nut 3 is equal to the offset distance between the eccentric protruding ring 8 and the axis of the lock nut 4 . All the other are with embodiment 1.

[0025]In this embodiment, the lock nut 3 and the lock nut 4 can also form a reinforced anti-loosening thread fastening structure with the bolt 10 . After the lock nut 3 and the bolt 10 are screwed together, the lock nut 4 is superimposed on the lock nut 3. When the lock nut 3 and the lock nut 4 are close, the eccentric convex ring 8 and the eccentric con...

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Abstract

The invention discloses an anti-loose thread fastening structure which comprises a bolt and a nut matched with the bolt, wherein variable angle oblique planes are arranged at the root of an internal thread of the nut, and the included angle between each variable angle oblique plane and a bisector of a thread angle of the internal thread is larger than a half of the thread angle of the internal thread. Threads of each pair of matched bolt and nut can be sufficiently contacted and interacted in the spinning length of the anti-loose thread fastening structure, so that load can be uniformly distributed, the stress structure is more balanced, the working life of the structure is prolonged, and the condition that the fastening effect is weakened early and even lost due to fast abrasion damage caused by overlarge local stress of an ordinary screw pair is avoided; and besides, the thread matching gaps between the threads of the bolt and the nut can be eliminated by means of the variable angle oblique planes of the nut, so that the bolt and the nut can be tightly matched in a longer spinning length, higher anti-loose torsional moment can be produced, and an ideal fastening effect can be kept on the use occasion with frequent vibration.

Description

technical field [0001] The present invention relates to a fastening structure, more specifically, it relates to a fastening structure with anti-loosening thread. Background technique [0002] Ordinary standard threaded fasteners, if the applied torque is small, the locking force is mainly concentrated on the thread surface of the first pair of mating threads of the bolt and nut, and the remaining threads are almost in a "floating" state; if increased When the torque is high, the thread mating surfaces of the first pair of threads will be bent and sheared, so that the second pair of mating threads will be under pressure and generate locking force, while the rest of the threads are still almost in a "floating" state; Continue to increase the torque, the stress on the first pair of screw teeth and the second pair of screw teeth is generally more than 80% of the total load of the entire screw pair fastening structure, and the thread surfaces of the subsequent pairs of screw teet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16B39/282F16B39/12F16B37/00
Inventor 胡艇胡建华
Owner 宁波华路汽车电器有限公司
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