CN112983957A - Locknut assembly - Google Patents

Abstract

The locknut assembly comprises a bolt, a nut and a locknut which are matched with each other; the bolt, the nut and the locking nut are sequentially locked and fixed, wherein an external thread section I is formed at the upper part of the bolt, and a limiting section I is formed at the lower part of the bolt; the upper part of the nut is provided with a thread section, the lower part of the nut is provided with a limiting section II matched with the limiting section I of the bolt, and the limiting section II has elasticity to ensure that the limiting section II deforms under pressure and is clamped and limited by the limiting section I; an inner thread section I is arranged in the inner cavity of the thread section and matched with an outer thread section I on the bolt, and an outer thread section II is arranged on the outer edge of the thread section; the upper part of the inner cavity of the locking nut is provided with a second internal thread section which is matched with a second external thread section on the nut, and the lower part of the inner cavity of the locking nut is provided with a tightening section which is matched with a second limiting section of the nut to ensure that the second limiting section deforms when being locked.

Description

Locknut assembly

The technical field is as follows:

the invention relates to a threaded connection structure, in particular to a locknut assembly which is simple in structure and convenient and labor-saving in machining and operation.

Background art:

when connecting the infrastructure with larger vibration such as bridges, large-scale operation machinery, crushing machinery and the like and the product parts which are frequently used in daily life and need to be opened and closed such as toilet covers and the like, the locknut is generally used to prevent the looseness of the nut caused by vibration, thereby influencing the normal operation of the facilities or machinery and the normal use of the product.

The current locknut kind or model are more, disclose a self-locking bolt in the chinese utility model patent that the grant bulletin number is CN201582278U, and it includes the bolt body and sets up the external screw thread on the bolt body, and the tank bottom surface of the thread groove of external screw thread is wedge inclined plane. During the use, when nut and spiral cooperation, the cusp of the thread tooth of internal thread tightly pushes up on the wedge inclined plane of the thread groove of external thread to produce the normal force that is much greater than standard screw thread, the very big increase of normal force can increase the frictional force between the internal and external screw thread, and then reach the purpose of locking auto-lock. However, in the normal force mode of increasing assembly timing by means of the wedge-shaped inclined surface, the clearance between the front inclined surfaces in the inclined surfaces at the two sides of the thread groove of the external thread of the bolt and the front inclined surfaces in the inclined surfaces at the two sides of the thread tooth of the internal thread of the nut cannot be eliminated, and the influence of the wedge-shaped inclined surface on the self-locking and anti-loosening performance of the bolt assembly is reduced.

The invention content is as follows:

in view of the above problems in the prior art, the present invention aims to provide a locknut assembly with simple structure and convenient and labor-saving processing and operation.

In order to achieve the purpose, the invention adopts the following technical scheme:

the locknut assembly comprises a bolt, a nut and a locknut which are matched with each other; the bolt, the nut and the locking nut are sequentially locked and fixed, wherein an external thread section I is formed at the upper part of the bolt, and a limiting section I is formed at the lower part of the bolt; the upper part of the nut is provided with a thread section, the lower part of the nut is provided with a limiting section II matched with the limiting section I of the bolt, and the limiting section II has elasticity to ensure that the limiting section II deforms under pressure and is clamped and limited by the limiting section I; an inner thread section I is arranged in the inner cavity of the thread section and matched with an outer thread section I on the bolt, and an outer thread section II is arranged on the outer edge of the thread section; an internal thread section II formed on the upper part of the inner cavity of the locking nut is matched with an external thread section II on the nut, and a tightening section formed on the lower part of the inner cavity of the locking nut is matched with a limiting section II of the nut to ensure that the limiting section II deforms when being locked.

Furthermore, the first limiting section is a toothed column with an outer toothed groove, the second limiting section is a barrel with an inner toothed groove, the toothed column is inserted into the barrel when the nut is screwed in the bolt, a gap is reserved between the toothed column and the inner wall of the barrel, and the barrel wall is provided with a groove to ensure that the outer toothed groove and the inner toothed groove are clamped and limited when the barrel is pressed and deformed.

Furthermore, a limiting stop is formed at the upper part of the outer edge of the threaded section, an external threaded section II is formed at the lower part of the outer edge of the threaded section, the top surface of the locking nut is just propped against the limiting stop when the locking nut is screwed in place, and the barrel is guaranteed to be pressed and deformed by the tightening section to enable the external tooth socket and the internal tooth socket to be clamped and limited.

Furthermore, the positions of the slots on the wall of the cylinder body are two sides of the cylinder shaft which are centrosymmetric.

Furthermore, the limiting stop is a limiting rib which is uniformly distributed along the circumferential direction of the upper part of the outer edge of the threaded section.

Further, the tightening section is a gradual slope along the inner wall of the lock nut.

By adopting the technical scheme, the bolt assembly not only solves the problems of poor vibration fastening performance and easiness in loosening of the existing bolt assembly, but also is simple in structure and convenient and labor-saving in processing and operation.

Description of the drawings:

the invention is described in detail below with reference to the accompanying drawings:

FIG. 1 is a first perspective exploded view of the present invention;

FIG. 2 is a schematic perspective exploded view of the present invention;

FIG. 3 is a schematic view of the combination of the present invention;

FIG. 4 is a sectional view of the assembled state of the present invention.

The specific implementation mode is as follows:

the invention is described in detail below with reference to the following figures and examples:

fig. 1-4 show an embodiment of the present invention, which is a locknut assembly, comprising abolt 1, anut 2, and alock nut 3, which are engaged with each other; thebolt 1, thenut 2 and thelocking nut 3 are sequentially locked and fixed, wherein an external thread section I11 is formed at the upper part of thebolt 1, and a limiting section I12 is formed at the lower part of the bolt; the upper part of thenut 2 is provided with athread section 21, the lower part is provided with a second limitingsection 22 which is matched with the first limitingsection 12 of the bolt, and the second limitingsection 22 has elasticity to ensure that the second limiting section is pressed to deform and is clamped and limited with the first limitingsection 12; an inner thread section I211 arranged in the inner cavity of thethread section 21 is matched with and locked and positioned with an outer thread section I11 on the bolt, and an outer thread section II 212 is arranged on the outer edge of thethread section 21; the upper part of the inner cavity of thelocking nut 3 is provided with a secondinternal thread section 31 which is matched with a secondexternal thread section 212 on the nut for locking and positioning, and the lower part is provided with atightening section 32 which is matched with a second limitingsection 22 of the nut for ensuring that the second limitingsection 22 deforms when being locked.

In a specific structure, the first limitingsection 12 can be a toothed column with anouter toothed groove 121, the second limitingsection 22 is a cylinder with aninner toothed groove 221, when thenut 2 is screwed into thebolt 1, the toothed column (the first limiting section 12) is inserted into the cylinder (the second limiting section 22) and a gap is reserved between the toothed column and the inner wall of the cylinder, and the wall of the cylinder is provided with agroove 222 which ensures that the cylinder deforms under pressure to enable the outer toothed groove and the inner toothed groove to be clamped and limited.

Furthermore, in order to facilitate the operation and have the limit function, alimit stop 213 is formed at the upper part of the outer edge of the threadedsection 21, and an external threaded section two 212 is formed at the lower part, so that the top surface of thelock nut 3 is just propped against the bottom surface of thelimit stop 213 when the lock nut is screwed in place, and the barrel is guaranteed to be pressed and deformed by the tightening section to tightly clamp and limit theexternal tooth grooves 121 and theinternal tooth grooves 221. In addition, the limit stop has another function of facilitating the operation of screwing thenut 2 on thebolt 1 by holding the limit stop by hands.

Further, the positions of theslots 222 arranged on the wall of the cylinder body (the second limiting section 22) are two sides of the cylinder shaft with central symmetry. Thelimiting stops 213 are limiting ribs uniformly distributed along the upper part of the outer edge of the threaded section in the circumferential direction. Thetightening segment 32 may be a gradual slope along the inner wall of the lock nut.

During installation, the bolt is inserted into the part to be connected, the nut is screwed in the bolt to the fastening position from the lower part, the first limiting section and the second limiting section are in clearance fit, the fastening nut is screwed in the locking nut from the lower part, the tightening section is a gradual change inclined plane along the inner wall of the locking nut, the tightening section gradually extrudes the second limiting section to enable the second limiting section to generate inward tightening deformation in the screwing-in process, the outer tooth socket and the inner tooth socket are clamped and limited, and the fastening nut is just installed in place when being screwed to the top end to contact with the bottom surface of the limiting gear.

The invention not only solves the problems of poor vibration fastening performance and easy looseness of the existing bolt assembly, but also has simple structure and convenient and labor-saving processing and operation. The device can be used for connecting and mounting various parts which need to be fastened by vibration and are easy to loosen, and is very wide in use.

While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. Locknut subassembly, its characterized in that: the bolt, the nut and the locking nut are matched with each other; the bolt, the nut and the locking nut are sequentially locked and fixed, wherein an external thread section I is formed at the upper part of the bolt, and a limiting section I is formed at the lower part of the bolt; the upper part of the nut is provided with a thread section, the lower part of the nut is provided with a limiting section II matched with the limiting section I of the bolt, and the limiting section II has elasticity to ensure that the limiting section II deforms under pressure and is clamped and limited by the limiting section I; an inner thread section I is arranged in the inner cavity of the thread section and matched with an outer thread section I on the bolt, and an outer thread section II is arranged on the outer edge of the thread section; an internal thread section II formed on the upper part of the inner cavity of the locking nut is matched with an external thread section II on the nut, and a tightening section formed on the lower part of the inner cavity of the locking nut is matched with a limiting section II of the nut to ensure that the limiting section II deforms when being locked.

2. The locknut assembly of claim 1 wherein: the first limiting section is a toothed column with an outer toothed groove, the second limiting section is a barrel with an inner toothed groove, the toothed column is inserted into the barrel when the nut is screwed in the bolt, a gap is reserved between the toothed column and the inner wall of the barrel, and the barrel wall is provided with a groove to ensure that the outer toothed groove and the inner toothed groove are clamped and limited when the barrel is deformed under pressure.

3. The locknut assembly of claim 2 wherein: the upper part of the outer edge of the thread section forms a limiting stop, the lower part forms an external thread section II, the top surface of the locking nut is just propped against the limiting stop when the locking nut is screwed in place, and the barrel is enabled to be pressed and deformed by the tightening section to enable the external tooth groove and the internal tooth groove to be clamped and limited.

4. The locknut assembly of claim 2 wherein: the positions of the slots arranged on the wall of the cylinder body are two sides of the central symmetry of the cylinder shaft.

5. A locknut assembly as defined in claim 3, wherein: the limiting stop is a limiting rib which is uniformly distributed along the circumferential direction of the upper part of the outer edge of the threaded section.

6. A locknut assembly as claimed in claim 1, 2, 3, 4 or 5, wherein: the tightening section is a gradual slope along the inner wall of the lock nut.

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