CN214247952U

CN214247952U - Anti-loose nut

Info

Publication number: CN214247952U
Application number: CN202120017644.7U
Authority: CN
Inventors: 甄海玉; 黄志文; 王帝
Original assignee: Beijing CRRC Heavy Industry Mechanics Co Ltd
Current assignee: Beijing CRRC Heavy Industry Mechanics Co Ltd
Priority date: 2021-01-05
Filing date: 2021-01-05
Publication date: 2021-09-21
Anticipated expiration: 2031-01-05

Abstract

The utility model discloses a locknut, which comprises a nut main body and an internal thread arranged on the inner hole of the nut main body; a wedge-shaped inclined plane is arranged at the crest of the internal thread; the end part of the nut main body is embedded with a non-metal insert; when the locknut is locked with the fastener, the crest of the external thread is tightly pressed on the wedge-shaped inclined plane, and the non-metal insert is in interference fit with the fastener. Because the crest department of screw thread including the wedge inclined plane sets up, consequently, the normal force that produces when making contact between the screw thread is the angle grow with the axis of fastener, and then makes locking frictional force grow, and the locking force grow of production has improved the locking performance of threaded connection department. In addition, the end of the nut main body is embedded with the non-metal insert, and when the nut is locked with the external thread of the fastener, the non-metal insert is in interference fit with the fastener, so that the anti-loosening performance of the threaded connection position is further improved.

Description

Anti-loose nut

Technical Field

The utility model belongs to the technical field of the nut technique and specifically relates to a locknut is related to.

Background

The screw thread coupling is used in various industries of construction machines, and has advantages of easy assembly and disassembly, no need of large equipment, large coupling force and repeated use, but it has inevitable weak points because the screw thread coupling is easy to disassemble: the equipment is easy to loosen under the action of impact, vibration or variable load, so that the equipment is damaged and even accidents happen.

Therefore, how to improve the anti-loosening performance of the threaded connection is a technical problem to be solved urgently by those skilled in the art.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention is to provide a lock nut to improve the locking performance of the threaded connection.

In order to achieve the above object, the present invention provides the following solutions:

a locknut comprises a nut body and an internal thread arranged on an inner hole of the nut body;

a wedge-shaped inclined plane is arranged at the crest of the internal thread;

a non-metal insert is embedded in the end part of the nut main body;

when the locknut is locked with the fastener, the crest of the external thread of the fastener is tightly propped against the wedge-shaped inclined plane, and the non-metal insert is in interference fit with the fastener.

In a specific embodiment, the wedge-shaped inclined surface forms an included angle of 30 degrees with the axis of the locknut.

In another specific embodiment, one end of the wedge-shaped slope is located below the pitch line of the internal thread and the other end is located above the pitch line of the internal thread.

In another specific embodiment, the non-metallic insert is a nylon insert.

In another specific embodiment, a mounting groove for mounting the non-metal insert is formed in the hole wall of the inner hole of the nut main body, and the mounting groove is located above the internal thread.

In another specific embodiment, the non-metallic insert has an inner diameter equal to the minor crest diameter of the internal thread.

In another specific embodiment, the outer wall of the nut body is provided with an anti-slip layer.

According to the utility model discloses an each embodiment can make up as required wantonly, and the embodiment that obtains after these combinations is also in the utility model discloses the scope is the utility model discloses a part of the concrete implementation mode.

The utility model discloses a concrete embodiment, when locknut used, screwed up locknut on the fastener for the crest top of fastener external screw thread is tight on locknut's wedge inclined plane, because the crest department of internal thread is located in the setting of wedge inclined plane, consequently, the normal force that produces when making contact between the screw thread is the angle grow with the axis of fastener, and then makes locking frictional force grow, and the locking force grow of production has improved the locking performance of threaded connection department. In addition, the end of the nut main body is embedded with the non-metal insert, and when the nut is locked with the external thread of the fastener, the non-metal insert is in interference fit with the fastener, so that the anti-loosening performance of the threaded connection position is further improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without any novelty.

Fig. 1 is a schematic view of a half-section structure of the locknut provided by the present invention;

fig. 2 is a schematic view of a partial structure of an internal thread of the locknut provided by the present invention;

fig. 3 is a schematic view of the force analysis when the locknut internal thread is matched with the fastener.

Wherein, in fig. 1-3:

the nut comprises a nut body 1, internal threads 2, a wedge-shaped inclined surface 201, a non-metal insert 3 and a fastener 4.

Detailed Description

In order to make the technical solution of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to fig. 1 to 3 and the detailed description.

As shown in fig. 1-3, the present invention provides a locknut, wherein the locknut includes a nut body 1 and an internal thread 2.

An inner hole is formed in the nut body 1, the internal thread 2 is arranged on the inner hole of the nut body 1, and specifically, the internal thread 2 is a trapezoidal thread.

The crest of the internal thread 2 is provided with a wedge-shaped inclined surface 201, and specifically, two ends of the wedge-shaped inclined surface 201 are respectively connected with adjacent threads in an inclined manner.

The end of the nut body 1 is embedded with a non-metal insert 3, and the non-metal insert 3 has enough strength and elasticity to realize interference fit with the fastener 4.

When the locknut is locked with the fastener 4, the crest of the external thread of the fastener 4 is tightly pressed on the wedge-shaped inclined surface 201, and the non-metal insert 3 is in interference fit with the fastener 4.

When locknut uses, tighten locknut on fastener 4 for the crest top of 4 external screw threads of fastener is tight on locknut's wedge inclined plane 201, because the crest department of internal thread 2 including wedge inclined plane 201 sets up, consequently, the normal force that produces when making the contact between the screw thread is the angle grow with the axis of fastener 4, and then makes locking frictional force grow, and the locking force grow of production has improved the locking performance of threaded connection department. In addition, the end of the nut body 1 is embedded with the non-metal insert 3, and when the nut is locked with the external thread of the fastener 4, the non-metal insert 3 is in interference fit with the fastener 4, so that the anti-loosening performance of the threaded connection part is further improved.

In some embodiments, the present invention specifically discloses that the wedge-shaped inclined surface 201 forms an angle of 30 ° with the axis of the locknut.

Further, the utility model discloses a wedge inclined plane 201's one end is located the below of internal thread 2 pitch diameter line, and the opposite side is located the top of internal thread 2 pitch diameter line, as shown in fig. 2.

In some embodiments, the non-metal insert 3 is a nylon insert, and it should be noted that the non-metal insert 3 may also be made of other non-metal materials.

In some embodiments, a mounting groove for mounting the non-metal insert 3 is formed in the hole wall of the inner hole of the nut body 1, and the mounting groove is located above the inner thread 2. When the locknut is installed in the forward direction, the non-metal insert 3 is positioned on the rear end face of the locknut.

Further, in order to facilitate the connection of the non-metal insert 3 and the fastener 4, the utility model discloses an inner diameter of the non-metal insert 3 is equal to the crest path of the internal thread 2.

In some embodiments, the outer wall of the nut body 1 is provided with an anti-slip layer, so that the outer wall of the nut body 1 can be conveniently clamped by a wrench or an inner hexagon.

It should be noted that the terms indicating the orientation in this document, for example, the upper, lower, front, rear, and the like are set in the directions shown in fig. 1, and are not intended to have other specific meanings merely for convenience of description.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the core concepts of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. The locknut is characterized by comprising a nut body and internal threads arranged on an inner hole of the nut body;

a wedge-shaped inclined plane is arranged at the crest of the internal thread;

a non-metal insert is embedded in the end part of the nut main body;

2. The locknut of claim 1 wherein the wedge-shaped ramp is angled 30 ° from the locknut axis.

3. The locknut of claim 2 wherein one end of the tapered ramp is below the internal thread pitch line and the other end is above the internal thread pitch line.

4. The locknut of claim 1 wherein said non-metallic insert is a nylon insert.

5. The locknut of claim 4, wherein a mounting groove for mounting the non-metal insert is formed on the inner hole wall of the nut body, and the mounting groove is located above the internal thread.

6. The locknut of claim 1 wherein the non-metallic insert has an inner diameter equal to the minor crest diameter of the internal thread.

7. The locknut of any one of claims 1-6, wherein an anti-slip layer is arranged on the outer wall of the nut body.