CN110454488A - A self-locking anti-loosening composite nut - Google Patents

Abstract

The invention discloses an automatic locking and anti-loosening compound nut, comprising: a compound nut body, the body of the compound nut is composed of an outer shell and an inner nut, and the length of the outer shell is 3-5 mm longer than the total length of the inner nut. The size of the growth is proportional to the increase of the specification and model of the nut. The jacket is a hollow hexagonal structure, and the inside of the jacket is divided into two intervals from top to bottom. The two intervals are separated by a step surface. It is an inverted cone with a large top and a small bottom. Compared with other existing self-locking nuts, the present invention only needs to be screwed in once, and the Hard Lock nut needs to be screwed in two nuts; If the piece is loosened by external force, the anti-loosening effect of the nut will be completely lost.

Description

A self-locking anti-loosening composite nut

technical field

The invention belongs to the field of fastening devices, specifically a composite nut, and more specifically, it is suitable for bolt fastening occasions with high safety factor and anti-loosening requirements. The use of the nut has no special effect on the matching bolts. A self-locking anti-loosening compound nut is required.

Background technique

With the large scale of my country's manufacturing equipment, the requirements for the stability and reliability of various power transmissions are getting higher and higher, especially the reliability of bolted connections and fastenings in steel structures and vehicles that involve personnel safety. The requirements are even stricter, even requiring "never loosen" nuts.

Contents of the invention

Aiming at the stringent requirements of safety and reliability of nuts in some special occasions, the present invention designs an automatic locking and anti-loosening composite nut. During the tightening process of this nut, when the nut is tightened to the fastening surface, As the composite nut is further tightened, the outer casing of the composite nut produces a compressive radial force on the inner nut, so that the nut and the threaded thread of the screw are pressed tightly to achieve the purpose of preventing loosening.

In order to achieve the above invention, the present invention adopts the following technical solutions: an automatic locking and anti-loosening composite nut, comprising: a composite nut body, the body of the composite nut is composed of an outer casing and an inner nut, and the outer casing The length of the inner nut is 3 to 5 mm longer than the total length of the inner nut, and the length of the extension is proportional to the increase of the size of the nut, that is, the larger the size of the nut, the greater the height. The jacket is a hollow hexagonal structure. The inside of the jacket is divided into two sections from top to bottom. The two sections are separated by a step surface. Above the step surface is an inner hexagon that fits with the inner nut to facilitate the insertion of the inner nut. ; The bottom of the step surface is an inverted conical shape with a large upper part and a smaller lower part.

Furthermore, the upper part of the inner nut is a hexagonal structure of an ordinary nut, and the lower part is an inverted cone with a large upper part and a smaller lower part, and a symmetrical opening is provided in the inverted tapered part, which is convenient for the nut to be tightened. Time to achieve contraction, and automatically locked.

Furthermore, both the upper half and the lower half of the inner nut are provided with internal threads.

Furthermore, the height above the step surface is 0.5-1 mm greater than the height of the upper part of the inner nut, and the difference in this part is to ensure that the composite nut can be effectively locked during the tightening process.

Compared with other existing self-locking nuts, the present invention only needs to be screwed in once, and the Hard Lock nut needs to be screwed in two nuts; If the piece is loosened by external force, the anti-loosening effect of the nut will be completely lost.

Description of drawings

Fig. 1 is a schematic diagram of the combined structure of the present invention.

Fig. 2 is a cross-sectional view of the jacket of the present invention.

Fig. 3 is a schematic structural diagram of the inner nut of the present invention.

1. Jacket, 2. Internal nut, 3. Step surface, 4. Opening, 5. Internal thread.

Detailed ways

The present invention will be further elaborated below in conjunction with the accompanying drawings.

Figures 1 to 3 are the preferred modes of the present invention, which show a composite nut for automatic locking and anti-loosening, including: a composite nut body, the body of the composite nut is composed of an outer sleeve and an inner nut, the The length of the jacket is 3-5mm longer than the total length of the inner nut, and the length of the overhang is proportional to the increase of the size of the nut, that is, the larger the size of the nut, the larger the height. The jacket is a hollow hexagonal structure. The inside of the jacket is divided into two sections from top to bottom. The two sections are separated by a step surface. Above the step surface is an inner hexagon that fits with the inner nut to facilitate the insertion of the inner nut. ; The bottom of the step surface is an inverted conical shape with a large upper part and a smaller lower part.

Furthermore, the upper part of the inner nut is a hexagonal structure of an ordinary nut, and the lower part is an inverted cone with a large upper part and a smaller lower part, and a symmetrical opening is provided in the inverted tapered part, which is convenient for the nut to be tightened. Time to achieve contraction, and automatically locked.

Furthermore, both the upper half and the lower half of the inner nut are provided with internal threads.

Furthermore, the height above the step surface is 0.5-1 mm greater than the height of the upper part of the inner nut, and the difference in this part is to ensure that the composite nut can be effectively locked during the tightening process.

The use method and principle of the present invention: first combine the inner nut with the outer jacket or put the outer jacket on the bolt first, then screw the inner nut along the screw rod, and then cooperate with the inner nut and the outer jacket together; during the tightening process, The jacket first contacts with the fastening surface, and the jacket produces an outward thrust. During the process of increasing the tightening force, the outer hexagon of the inner nut gradually sinks into the jacket; during this process, the inverted conical part of the lower part of the inner nut It is gradually pressed against the inverted conical surface of the outer casing, so that the threaded threaded thread of the lower half of the inner nut with an inverted tapered structure is pressed tightly with the screw threaded thread to realize self-locking.

During the fastening process of the composite nut, the jacket is in contact with the fastening surface, the relative contact area is smaller than that of ordinary nuts, and the frictional resistance on the fastening surface is small, which is beneficial to the effective fastening of the nut; at the same time, when the composite nut is fastened in place Finally, the jacket is still in contact with the fastening surface, and shocks and vibrations occur on the fastening surface. First, the jacket receives the impact force, which is transmitted to the inner nut. Due to the principle of the inverted conical contact surface, the threaded thread of the inner nut will It is more tightly pressed with the screw thread, and the self-locking force is increased, effectively realizing the anti-loosening effect.

After the composite nut is disassembled, the screw rod will not be damaged. However, during the disassembly process, the disassembly force of the disassembly nut is relatively large. After 3-5 turns of disassembly, the outer cover and the inner nut must be disengaged before the nut can be completely released. Locking force, its anti-loosening ability is better than existing nuts on the market.

Compared with other existing self-locking nuts, the present invention only needs to be screwed in once, and the Hard Lock nut needs to be screwed in two nuts; If the piece is loosened by external force, the anti-loosening effect of the nut will be completely lost.

Claims (4)

1. A composite nut for automatic locking and anti-loosening, comprising: a composite nut body, the body of the composite nut is composed of an overcoat and an inner nut, and it is characterized in that: the length of the overcoat is greater than the total length of the inner nut by 3-3 5mm, the size of the growth is proportional to the increase of the specification of the nut; the jacket is a hollow hexagonal structure, and the inside of the jacket is divided into two sections from top to bottom, and the two sections are separated by a step surface Separated, the upper part of the step surface is a clearance fit between the inner hexagon and the inner nut; the lower part of the step surface is an inverted cone with a large upper part and a smaller lower part. 2. A self-locking and anti-loosening composite nut according to claim 1, characterized in that: the upper part of the inner nut is a hexagonal structure of an ordinary nut, and the lower part is an inverted cone with a large upper part and a smaller lower part shape, with symmetrical openings in the inverted tapered part. 3. The self-locking and anti-loosening composite nut according to claim 1 or 2, characterized in that: both the upper half and the lower half of the inner nut are provided with internal threads. 4. The self-locking and anti-loosening compound nut according to claim 1, characterized in that: the height above the step surface is 0.5-1mm greater than the height of the upper half of the inner nut.