CN219062200U

CN219062200U - Lock bolt and nut assembly

Info

Publication number: CN219062200U
Application number: CN202222620940.3U
Authority: CN
Inventors: 叶树铿; 张伟
Original assignee: Changtai Iridium Technology Co ltd
Current assignee: Changtai Iridium Technology Co ltd
Priority date: 2022-09-30
Filing date: 2022-09-30
Publication date: 2023-05-23
Anticipated expiration: 2032-09-30

Abstract

The utility model discloses a lockbolt and nut assembly, which comprises a bolt and a nut which are matched with each other, wherein the bolt comprises a bolt head and a screw rod which are connected with each other, an external thread section is formed at the upper part of the screw rod, and external teeth are arranged at the lower part of the screw rod along the axial direction; the inner cavity of the upper part of the nut is provided with an internal thread matched with the external thread section of the screw rod, the lower part of the nut forms an annular elastic cylinder, and the inner wall of the elastic cylinder is provided with internal teeth along the axial direction; in the process of screwing the nut into the screw rod, the external teeth extrude the internal teeth to enable the elastic cylinder to deform outwards, and when the nut is locked, the elastic cylinder elastically resets to enable the external teeth to be meshed with the internal teeth. The utility model has simple structure and good anti-loose effect.

Description

Lock bolt and nut assembly

Technical Field

The utility model relates to the technical field of fastening, in particular to a lockbolt and nut assembly.

Background

The toilet cover is usually locked to the toilet by bolts and nuts. The cover plate is inevitably subjected to the effects of variable loads such as impact, vibration, left and right swing and the like in use, if the nut does not have additional anti-loosening measures, the nut can gradually loosen and retreat after long-term use, the locking force is reduced, the cover plate is loosened, and bad experience is brought to a user.

For the cover plate of the nut locking operation, the bolt and the nut are mostly made of engineering plastic materials due to low cost. In the common nut anti-loosening method, the friction force between threads is increased, such as a spring washer is increased, double nuts are used, and the like, so that the contact pressure between the locked thread surfaces is not lost due to the change of external load, and the large friction resistance is always kept to prevent loosening, so that the cover plate lower lock nut is convenient to disassemble and assemble in a narrow space. However, these methods for increasing thread friction are not effective in preventing loosening on plastic bolts and nuts because the plastic surface friction coefficient is low and the plastic threads cannot withstand too much locking pressure, resulting in a final failure to provide a large loosening friction.

Disclosure of Invention

The utility model provides a lockbolt and nut assembly, which overcomes the defects existing in the background technology and adopts the following technical scheme:

the anti-loose bolt and nut assembly comprises a bolt and a nut which are matched with each other, wherein the bolt comprises a bolt head and a screw rod which are connected with each other, an external thread section is formed at the upper part of the screw rod, and external teeth are arranged at the lower part of the screw rod along the axial direction; the inner cavity of the upper part of the nut is provided with an internal thread matched with the external thread section of the screw rod, the lower part of the nut forms an annular elastic cylinder, and the inner wall of the elastic cylinder is provided with internal teeth along the axial direction; in the process of screwing the nut into the screw rod, the external teeth extrude the internal teeth to enable the elastic cylinder to deform outwards, and when the nut is locked, the elastic cylinder elastically resets to enable the external teeth to be meshed with the internal teeth.

In a preferred embodiment, the internal teeth are continuously distributed along the whole circle of the inner wall of the elastic cylinder, and the external teeth are at least one along the circumference of the lower part of the screw; or the internal teeth are at least arranged along the inner wall of the elastic cylinder, and the external teeth are continuously distributed along the whole circle of the circumference of the lower part of the screw rod.

In a preferred embodiment, the surface of the external teeth along the locking and rotating direction of the nut is a slow inclined surface, the surface of the external teeth along the loosening and rotating direction of the nut is a steep inclined surface, and the gradient of the slow inclined surface is smaller than that of the steep inclined surface.

In a preferred embodiment, the outer wall of the nut is provided with lugs protruding in the axial direction.

Compared with the prior art, the technical scheme of the utility model has the advantages of simple structure and good anti-loosening effect.

Drawings

FIG. 1 is an exploded view of a bolt and nut assembly according to a first embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a bolt-nut assembly according to a first embodiment of the utility model;

FIG. 3 is a cross-sectional view showing a locking section and a fastening section for locking and limiting according to a first embodiment of the present utility model;

FIG. 4 shows the utility model of FIG. 3AA partial enlarged view of the location;

fig. 5 is an overall exploded view of a bolt-nut assembly according to a second embodiment of the present utility model.

Detailed Description

The present utility model will be further described in detail in the following detailed description of the utility model, in order to enable those skilled in the art to better understand the present utility model.

Embodiment one:

referring to fig. 1 to 4, a lockbolt-nut assembly of the present utility model includes a bolt 1 and a nut 2 which are engaged with each other, the bolt 1 includes a bolt head 10 and a screw 11 which are connected, an external thread section 110 is formed at an upper portion of the screw 11, external teeth 111 are provided at a lower portion of the screw 11 in an axial direction, and at least one external tooth 111 is provided along a circumference of a lower portion of the screw; the inner cavity of the upper part of the nut 2 is provided with an internal thread 20 matched with the external thread section 110 of the screw 11, the lower part of the nut forms an annular elastic cylinder 21, the inner wall of the elastic cylinder 21 is provided with internal teeth 210 along the axial direction, and the internal teeth 210 are continuously distributed along the whole circle of the inner wall of the elastic cylinder 21; during the screwing of the nut 2 into the screw 11, the external teeth 111 press the internal teeth 210 to deform the elastic tube 21 to the outside, and when the nut 2 is locked, the elastic tube 21 elastically returns to engage the external teeth 111 with the internal teeth 210. The internal teeth 210 of the elastic cylinder 21 are meshed with the external teeth 111 at the lower part of the screw 11, so that the elastic cylinder 21 is extruded to deform when the nut 2 is loosened and rotated, the internal teeth 210 are separated from the external teeth 111, the nut 2 is loosened, the looseness prevention of the nut 2 and the screw 11 is realized, the structure is simple, and the looseness prevention effect is good.

When the nut is installed, the internal thread 20 of the nut 2 is screwed into the external thread section 110 of the screw 11, after the internal teeth 210 of the elastic cylinder 21 are in contact with the external teeth 111 at the lower part of the screw 11, the nut 2 is continuously rotated, the elastic cylinder 21 is pressed and deformed, so that the internal teeth 210 are separated from the external teeth 111, and the nut 2 is continuously screwed in; when the nut 2 stops rotating to the locking position, the elastic cylinder 21 elastically resets to engage the external teeth 111 with the internal teeth 210, and the nut 2 and the bolt 1 are prevented from loosening. The surface of the external teeth 111 at the lower part of the screw 11 along the locking rotation direction of the nut 2 is a slow inclined surface 1111, the surface of the external teeth 111 along the loosening rotation direction of the nut 2 is a steep inclined surface 1112, and the gradient of the slow inclined surface 1111 is smaller than that of the steep inclined surface 1112, so that the rotating force when the nut 2 is locked is smaller than that when the nut 2 is loosened.

The outer wall of the nut 2 is provided with lugs 22 in an axially protruding manner, so that the torque force is increased when the nut 2 is rotated, and the nut 2 is easier to rotate. The bolt 1 and the nut 2 are made of plastic, so that the cost is low, and the elastic tube 21 is easy to be pressed and deformed.

Example two

Referring to fig. 5, the second embodiment is different from the first embodiment in that: the lower part of the screw 11 is provided with external teeth 111 along the axial direction, and the external teeth 111 are continuously distributed along the whole circle of the circumference of the lower part of the screw; the inner wall of the elastic tube 21 is provided with the inner teeth 210 along the axial direction, and at least one inner tooth 210 is provided along the inner wall of the elastic tube 21, and other structures are the same as those of the first embodiment, and details are not repeated here.

The above embodiments are only for further illustrating a lockbolt and nut assembly according to the present utility model, and therefore should not be construed as limiting the scope of the present utility model, i.e. the equivalent changes and modifications according to the claims and the specification should be considered as falling within the scope of the present utility model.

Claims

1. A lockbolt nut assembly, characterized in that: the bolt comprises a bolt head and a screw rod which are connected, wherein an external thread section is formed at the upper part of the screw rod, and external teeth are arranged at the lower part of the screw rod along the axial direction; the inner cavity of the upper part of the nut is provided with an internal thread matched with the external thread section of the screw rod, the lower part of the nut forms an annular elastic cylinder, and the inner wall of the elastic cylinder is provided with internal teeth along the axial direction; in the process of screwing the nut into the screw rod, the external teeth extrude the internal teeth to enable the elastic cylinder to deform outwards, and when the nut is locked, the elastic cylinder elastically resets to enable the external teeth to be meshed with the internal teeth; the surface of the external teeth along the nut locking rotation direction is a slow inclined surface, the surface of the external teeth along the nut loosening rotation direction is a steep inclined surface, and the gradient of the slow inclined surface is smaller than that of the steep inclined surface.

2. The lockbolt-nut assembly of claim 1, wherein: the inner teeth are continuously distributed along the whole circle of the inner wall of the elastic cylinder, and the outer teeth are at least one along the circumference of the lower part of the screw rod; or the internal teeth are at least arranged along the inner wall of the elastic cylinder, and the external teeth are continuously distributed along the whole circle of the circumference of the lower part of the screw rod.

3. The lockbolt-nut assembly of claim 1, wherein: and a lug is arranged on the outer wall of the nut in an axially protruding way.