CN112145535A

CN112145535A - Novel double-locknut

Info

Publication number: CN112145535A
Application number: CN202011015358.3A
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: 2020-09-24
Filing date: 2020-09-24
Publication date: 2020-12-29

Abstract

The utility model provides a pair of novel two locknut, including upper nut and lower nut, the two is the variable tooth type locknut, and there is 30 wedge inclined planes at the bottom of the female thread tooth of variable tooth type locknut, and upper nut and lower nut are connected, and the internal thread of upper nut and the internal diameter of lower nut are the same and the wedge inclined plane incline direction of female thread is opposite. Through setting up two variable tooth type locknuts, on the upper and lower nut screw in bolt that will connect, the external screw thread of bolt contacts with the wedge inclined plane of upper nut and lower nut simultaneously. The upper nut can apply axial pressure to the lower nut, and when the lower nut of reverse installation receives pressure, axial displacement is produced, so that the tooth point of the external thread contacts with the internal thread inclined plane, and the lower nut has the anti-loosening effect of the wedge-shaped thread. The upper nut is positively mounted, so that the upper nut has the anti-loosening effect of the wedge-shaped threads, and the lower nut also has the anti-loosening effect after being pressed by the upper nut, so that the double anti-loosening nut has good anti-loosening performance integrally.

Description

Novel double-locknut

Technical Field

The invention relates to the technical field of locknuts, in particular to a novel double locknut.

Background

Threaded connections are used in all industries of construction machinery, and threaded fasteners are used for connection of heavy machinery and assembly of light components. The common threaded fasteners comprise bolts, studs, screws, nuts, washers and the like, and threaded connection is essential in all aspects of production and life. Threaded connections are widely used because they have a number of advantages: the assembly and disassembly are easy, large-scale equipment is not needed, the connecting force is large, and the device can be repeatedly used. However, just because of its easy disassembly, the threaded fastener has inevitable weaknesses: 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, the reliability of the threaded connection directly affects the proper operation of the machine equipment, and effective anti-loosening measures need to be taken for the threaded fastener.

A common double-nut anti-loose structure, such as a Thangson thread anti-loose bolt, is mainly characterized in that an external thread on the bolt is a left-handed and right-handed composite thread and is matched with a left-handed and right-handed internal thread to be used together, so that the anti-loose effect is achieved. However, the bolt is complex to process, the assembly efficiency is low, and under the working condition of long-term vibration or severe vibration, the risk of looseness and even falling is easy to occur, so that the fastening performance of the fastening equipment is influenced.

Therefore, on the premise that the bolt uses a common thread form, how to improve the mounting efficiency and the anti-loosening performance by improving the nut structure is a technical problem to be solved urgently by the technical personnel in the field.

Disclosure of Invention

In view of this, the present invention provides a novel double-locknut, which can improve the installation efficiency and the anti-loosening performance on the premise that the bolt uses a common thread form.

The invention provides a novel double-check nut which comprises an upper nut and a lower nut, wherein the upper nut and the lower nut are both variable-tooth check nuts, the bottoms of female threads of the variable-tooth check nuts are provided with 30-degree wedge-shaped inclined planes, the upper nut is connected with the lower nut, the inner diameters of the inner threads of the upper nut and the inner threads of the lower nut are the same, and the inclination directions of the wedge-shaped inclined planes of the female threads are opposite.

Preferably, in the novel double-locknut, the included angle between the wedge-shaped inclined plane and the upper plane of the internal thread is 30 °.

Preferably, in the above novel double-locknut, the bottom end surface of the upper nut and the top end surface of the lower nut are inclined surfaces.

Preferably, in above-mentioned novel two locknut, the bottom of upper nut is close to internal thread department and is provided with the arch, the top of lower nut with protruding relative position matches and is provided with the joint groove, upper nut with the lower nut passes through fourth of the twelve earthly branches and presses the mode and is connected.

Preferably, in above-mentioned novel two locknut, the arch is bar structure, the joint groove is including being used for leading-in bar structure's entry section and having to the tank bottom that extends to nut outer wall slope is downwards, and after the two crimping connection, bar structure is in the tank bottom extrusion deformation forms the joint.

The utility model provides a pair of novel two locknut, including upper nut and lower nut, the two is the variable tooth type locknut, and there is 30 wedge inclined plane at the bottom of the female thread tooth of variable tooth type locknut, and the upper nut is connected with the lower nut, and the internal thread of upper nut and lower nut link up from top to bottom, and the internal thread of upper nut and lower nut's the same just wedge inclined plane incline direction of female thread of internal diameter is opposite. The present case is through setting up two variable tooth type locknuts, and two internal thread is just one anti-, and before the installation, the bottom of upper nut is connected with the top of lower nut, and in fastening process, on the novel two locknut screw in bolts that will connect, the external screw thread of bolt contacts simultaneously with the wedge inclined plane of upper nut and lower nut. The upper nut can apply axial pressure to the lower nut, and when the lower nut which is reversely installed is under pressure, axial displacement is generated, so that the tooth point of the external thread is in contact with the 30-degree inclined plane of the internal thread, and the lower nut has the anti-loosening effect of the wedge-shaped thread. The upper nut is positively installed, so that the upper nut has the anti-loosening effect of the wedge-shaped threads, and the lower nut also has the anti-loosening effect after being pressed by the upper nut, so that the whole structure of the double anti-loosening nuts has good anti-loosening performance.

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 creative efforts.

Fig. 1 is a schematic structural view of a novel double locknut provided in an embodiment of the present invention;

fig. 2 is a cross-sectional view of fig. 1.

1. Upper nut, 101, bar structure, 2, lower nut.

Detailed Description

The invention provides a novel double-check nut which can improve the installation efficiency and the check performance on the premise that a bolt is in a common tooth shape.

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The utility model provides a pair of novel two locknut, including top nut 1 and lower nut 2, the two is the variable tooth type locknut, and there is 30 wedge inclined planes at the bottom of the female thread tooth of variable tooth type locknut, and top nut 1 is connected with lower nut 2, and top nut 1 link up from top to bottom with the internal thread of lower nut 2, and the internal diameter of top nut 1 is the same with the internal thread of lower nut 2 and the wedge inclined plane incline direction of female thread is opposite.

It should be noted that, the variable-thread locknut has simple structure, good anti-loosening performance and can be used repeatedly, the root of the female thread has a 30-degree wedge-shaped inclined plane, when the bolt and the nut are engaged, the bolt tooth tip rotates along with the thread and is completely propped against the 30-degree inclined plane of the nut to form a novel spiral self-locking thread line, thereby generating great locking force.

The present case is through setting up two variable tooth type locknuts, and two internal thread is just anti- (the internal thread forward setting of upper nut, the internal thread of lower nut sets up in reverse), and before the installation, the bottom of upper nut 1 is connected with the top of lower nut 2, and in fastening process, on the novel two locknut screw in bolts that will connect, the external screw thread of bolt contacts simultaneously with the wedge inclined plane of upper nut and lower nut. The upper nut 1 can apply axial pressure to the lower nut 2, and when the lower nut 2 which is reversely installed bears the pressure, axial displacement is generated, so that the tooth point of the external thread is in contact with the 30-degree inclined plane of the internal thread, and the lower nut 2 has the anti-loosening effect of the wedge-shaped thread. The upper nut 1 is positively installed and has the anti-loosening effect of the wedge-shaped threads, and the lower nut 2 also has the anti-loosening effect after being pressed by the upper nut 1, so that the overall structure of the double anti-loosening nut has good anti-loosening performance.

In particular, the wedge-shaped chamfer has an angle in the range of 30 ° ± 10 °, preferably 30 °, with the upper plane of the internal thread.

In the specific embodiment, the bottom end surface of the upper nut 1 and the top end surface of the lower nut 2 are inclined surfaces. The angle between the inclined surface and the downward extending direction of the central shaft is more than 90 degrees, as shown in fig. 2.

In the specific implementation mode, the bottom of the upper nut 1 is provided with a bulge close to the internal thread, the top of the lower nut 2 is provided with a clamping groove in a matching manner with the relative position of the bulge, and the upper nut 1 is connected with the lower nut 2 in a riveting manner. The upper nut and the lower nut are connected together in a mortise pressing mode, and fastening and mounting efficiency is improved.

Further, the protrusion is bar-shaped structure 101, and the joint groove includes the leading-in section of entry that agrees with bar-shaped structure 101 and has the tank bottom that 2 outer walls of down nut extend, and the two fourth of the twelve earthly branches press the connection back, and bar-shaped structure 101 forms the joint at the bottom of the groove extrusion deformation. Because the upper nut 1 and the lower nut 2 are made of metal materials, the deformation is easily generated in the extrusion process, and the strip-shaped structure of the upper nut forms a hook-shaped structure after the extrusion deformation and can be clamped with the clamping groove of the lower nut.

Two wedge threads which are arranged in the forward direction and the reverse direction are matched for use, the anti-loosening performance is improved, and the problem that the performance of equipment is influenced by overlarge stress on the surface of a fastener is solved through a double-nut structure. In addition, the joint of the upper nut and the lower nut is an inclined plane, and the problem of reduction of anti-loosening performance caused by overlarge verticality tolerance of the internal thread can be solved by matching use.

According to the invention, on the premise of using a common tooth form, the structure of the nut is improved, the upper nut and the lower nut are connected together, and the problems of low assembly efficiency and higher fastener cost of a double nut in the fastening process are solved. Meanwhile, the anti-loosening performance of the nut under the working condition of long-term vibration or severe vibration is improved.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The utility model provides a novel two locknut, its characterized in that, includes upper nut (1) and lower nut (2), and the two is the lock nut of tooth form of becoming, there is 30 wedge inclined planes at the bottom of the female thread tooth of lock nut of tooth form of becoming, upper nut (1) with lower nut (2) are connected, the internal thread of upper nut (1) with the internal diameter of the internal thread of lower nut (2) is the same and the wedge inclined plane slope opposite direction of female thread.

2. The novel double locknut of claim 1 wherein the angle between the tapered inclined surface and the upper plane of the internal thread is 30 °.

3. The new double locknut according to claim 1, characterized in that the bottom end face of the upper nut (1) and the top end face of the lower nut (2) are inclined.

4. The novel double anti-loose nut as claimed in claim 3, characterized in that a protrusion is arranged at the bottom end of the upper nut (1) near the internal thread, a clamping groove is arranged at the top end of the lower nut (2) in a matching manner with the protrusion, and the upper nut (1) and the lower nut (2) are connected in a riveting manner.

5. The novel double anti-loose nut as claimed in claim 4, characterized in that the protrusion is a bar-shaped structure (101), the clamping groove comprises an inlet section for guiding the bar-shaped structure (101) and a groove bottom extending obliquely downwards towards the outer wall of the lower nut (2), and after the bar-shaped structure (101) is crimped and connected with the lower nut, the bar-shaped structure is extruded and deformed at the groove bottom to form the clamping.