CN113847328A

CN113847328A - Thickened hexagonal flange face nut

Info

Publication number: CN113847328A
Application number: CN202111199121.XA
Authority: CN
Inventors: 林海军; 任玉芹; 龚龙
Original assignee: Dongfeng Motor Fastener Co ltd
Current assignee: Dongfeng Motor Fastener Co ltd
Priority date: 2021-10-14
Filing date: 2021-10-14
Publication date: 2021-12-28

Abstract

The invention discloses a thickened hexagonal flange nut which comprises a body consisting of a flange part and a hexahedral cylinder, wherein the hexahedral cylinder is internally provided with a communicated internal thread part and a hollow part; under the condition of not changing the length of the thread, the invention adds a section of hollow cavity, which is equivalent to increasing the holding length of the thread pair, improves the rigidity of the thread pair, ensures that the thread pair still keeps better axial force under the actions of impact, vibration and variable load, and greatly improves the anti-loosening performance.

Description

Thickened hexagonal flange face nut

Technical Field

The invention belongs to the field of fasteners, and particularly relates to a thickened hexagonal flange nut.

Background

With the development of the automobile industry, host manufacturers have made higher requirements on the safety and reliability of the threaded connection of the fastener. The traditional threaded connection has two main assembling modes: a common hexagonal head bolt 1 is matched with a common hexagonal head nut 2 (shown in figure 1); the normal hex flange face bolts 3 mate with hex flange face nuts 4 (as shown in fig. 2). The threaded connections have self-locking property, and cannot automatically loosen when the static load and the working temperature change little; however, under the action of impact, vibration and variable load and when the working temperature changes greatly, the connection is still likely to loosen, so that the normal work is influenced, and even accidents occur; therefore, the design needs to take the anti-loosening into consideration. The traditional anti-loose method mainly comprises two methods: the anti-loosening by utilizing the additional friction force is realized by adding a spring washer 7 on the basis of the bolt 5 and the nut 6 (as shown in figure 3) or adopting double opposite nuts 8 for preventing loosening on the bolt (as shown in figure 4). The special anti-loosening elements are adopted, split pins 9 (shown in figure 5) are added on the basis of the bolts 5 and the nuts 6, or series steel wires 10 (shown in figure 6) are added between adjacent nuts 6, or stop washers are additionally arranged, and the anti-loosening methods have the problems of low assembly efficiency, high assembly cost and poor anti-loosening effect.

Disclosure of Invention

The invention provides a thickened hexagonal flange nut, which solves the problem of poor anti-loosening effect of the conventional nut.

In order to solve the technical problems, the technical scheme of the invention is as follows: the utility model provides a hexagonal flange face nut of thickening, includes the body that comprises flange portion and six cylinder, its characterized in that: be equipped with communicating internal thread portion and hollow portion in the hexahedral cylinder, the one end of hollow portion extends to flange portion in, hollow portion and the pole portion clearance fit of bolt.

Further limited to the above technical solution, the thickness of the body is one time of the outer diameter.

The technical scheme is further limited, and the diameter of the hollow part is gradually increased from inside to outside.

Has the advantages that: under the condition of not changing the length of the thread, the invention adds a section of hollow cavity, which is equivalent to increasing the holding length of the thread pair, improves the rigidity of the thread pair, ensures that the thread pair still keeps better axial force under the actions of impact, vibration and variable load, and greatly improves the anti-loosening performance.

Drawings

Fig. 1 shows the matching of a conventional hexagon head bolt and a conventional hexagon head nut in the background art.

Fig. 2 shows the matching of a conventional hexagonal flange bolt and a hexagonal flange nut in the prior art.

Fig. 3 is a schematic diagram of a spring washer anti-loose in the prior art.

FIG. 4 is a schematic diagram of a double nut lock of the prior art.

Fig. 5 is a schematic diagram of the split pin anti-loosening in the prior art.

Fig. 6 is a schematic diagram of the looseness prevention of the steel wire in the background art.

Fig. 7 is a schematic structural diagram of the present invention.

Fig. 8 is a state diagram of the use of fig. 7.

Fig. 9 is a static moment attenuation comparison test chart of a normal nut and a thickened nut.

Detailed Description

As shown in fig. 7 and 8, a thickened hexagonal flange nut includes a body composed of a flange 11 and a hexahedral cylinder 12, in which a communicating internal thread 121 and a hollow portion 122 are provided, one end of the hollow portion extends into the flange, and the hollow portion is in clearance fit with a rod 13 of a bolt;

as shown in fig. 7 and 8, the thickness H of the body is twice the size of the outer diameter Φ; below the value, the thread length is short, the number of thread buckles is small, the number of thread buckles participating in stress is small, stress of a single thread is increased, the strength of the thread and parts is reduced, and the anti-loosening effect is poor; above this value, the screw-thread fit length is long, reducing the assembly accuracy;

as shown in fig. 7 and 8, the diameter of the hollow portion 122 gradually increases from inside to outside, and the hollow portion is similar to a cone; during cold heading forming, because the hollow cavity with the changed diameter has the drawing slope, the punch bears small resistance when being drawn out, the finish degree of a machined surface is high, and the service life of the punch is greatly prolonged;

fig. 9 is a static moment attenuation comparison test of a normal nut and a thickened nut: comparing nuts of three specifications of M12-M16mm, and standing for 24 hours after assembly; in the table, the clamping force of the common nut shown by the long column body and the clamping force of the thickened nut shown by the short column body are distributed and concentrated, the static attenuation is small and is only 11%, and the static attenuation is far superior to 62% of that of the common nut, so that the anti-loosening performance of the thickened nut is far superior to that of the common nut.

The thickened nut is formed at one time by adopting a cold heading process; the thickened nut is the same as a common nut in assembly mode, an air gun or an electric gun is used, assembly beats are consistent, and assembly efficiency is the same.

Claims

1. The utility model provides a hexagonal flange face nut of thickening, includes the body that comprises flange portion and six cylinder, its characterized in that: be equipped with communicating internal thread portion and hollow portion in the hexahedral cylinder, the one end of hollow portion extends to flange portion in, hollow portion and the pole portion clearance fit of bolt.

2. A thickened hexagonal flanged nut as claimed in claim 1, wherein: the thickness of the body is one time of the outer diameter size.

3. A thickened hexagonal flanged nut as claimed in claim 1 or 2, wherein: the diameter of the hollow part is gradually increased from inside to outside.