CN205559488U - Looseness -prevention bolt - Google Patents

Abstract

The utility model discloses an anti-loosening bolt. The anti-loosening bolt includes a screw rod and a nut; an anti-loosening cover is installed at the end of the screw rod, and the end of the screw rod has a threaded hole opposite to its external thread, and the anti-loosening cover has a screw with the end of the screw rod The anti-loosening screw section matched with the internal threaded hole, the anti-loosening cover has a cavity for accommodating the end of the screw, and the inner end surface of the outer wall of the cavity forms an engagement structure with the outer end surface of the nut; the anti-loosening cover The direction of rotation between the cap and the screw is opposite to the direction of rotation between the nut and the screw. Therefore, when the anti-loosening cap is tightened, the outer bottom surface of the anti-loosening cap and the joint surface of the nut form an interlocking structure, so that if the nut becomes loose, the anti-loosening cap will be driven to rotate, so that the anti-loosening cap is further tightened, and at the same time, the anti-loosening cap can be tightened. The structure fully guarantees that the anti-loosening cover itself will not loosen, and the anti-loosening effect of the anti-loosening cover itself is reliable.

Description

A kind of anti-loosening bolt

technical field

The utility model relates to an anti-loosening bolt, which belongs to the field of fasteners.

Background technique

The basic principle of threaded connection anti-loosening is to prevent the relative rotation of the thread pair. According to the basic principle of anti-loosening of threaded connections, the commonly used anti-loosening methods can be roughly divided into three types: increasing frictional force to prevent loosening, locking and preventing loosening with mechanical fasteners, and destroying the relationship between thread motion pairs to prevent loosening. Among them: to increase friction and prevent loosening, elastic washers and double nuts are generally used to increase the friction between the joint surfaces to prevent the nuts from loosening; locking and preventing loosening with mechanical fasteners includes using cotter pins, stoppers, etc. Washers, steel wires connected in series, compression joints, etc. to prevent the nut from loosening; the anti-loosening methods for destroying the thread motion pair relationship include riveting, end punching, side punching, bonding and other methods. Except for bonding, the rest are generally only suitable for non-loosening. In case of disassembly.

Chinese utility model patent application CN201310345640.1 discloses a kind of anti-loosening bolt, as shown in Figure 12, it includes screw rod and nut, also includes gland, flat key and hexagon socket head screw, and the outer circular surface of described screw rod bottom is provided with There is a keyway, the middle position of the lower end of the screw is provided with a threaded hole, the gland is connected with the screw through a flat key, the hexagon socket head screw is installed in the threaded hole of the screw, and the gland is pressed tightly on the lower end surface of the nut superior. The anti-loosening of this patent mainly relies on the hexagon socket head cap screw, and the anti-loosening of the hexagon socket cap screw is unreliable.

Chinese utility model patent application CN201110041751.4 discloses a T-shaped nail anti-loosening bolt. As shown in Figure 13, the bolt is equipped with an anti-loosening device consisting of a locking washer and a T-shaped nail at the tail end of the screw rod. A reverse internal thread hole is opened at the end to try to prevent loosening. However, in this patent application, the anti-loosening of the T-shaped nail itself is unreliable. At the same time, if the T-shaped nail breaks in the connecting bolt hole , it cannot be removed.

Utility model content

The utility model aims at providing an anti-loosening bolt, which realizes very reliable anti-loosening of the bolt connection.

In order to achieve the above object, the technical solution adopted in the utility model is:

An anti-loosening bolt, including a screw and a nut; its structural feature is that an anti-loosening cover is installed at the end of the screw, and a threaded hole opposite to its external thread is opened at the end of the screw, and the anti-loosening The cover has an anti-loosening screw section matched with the threaded hole at the end of the screw, the anti-loosening cover has a cavity for accommodating the end of the screw, and the inner end surface of the outer wall of the cavity is engaged with the outer end surface of the nut Structure; the thread direction between the anti-loosening cover and the screw rod is opposite to the thread direction between the nut and the screw rod.

Therefore, when the anti-loosening cap is tightened, the outer bottom surface of the anti-loosening cap and the joint surface of the nut form an interlocking structure, so that if the nut becomes loose, the anti-loosening cap will be driven to rotate, so that the anti-loosening cap is further tightened, and at the same time, the anti-loosening cap can be tightened. The structure fully guarantees that the anti-loosening cover itself will not loosen, and the anti-loosening effect of the anti-loosening cover itself is reliable.

According to the embodiments of the present invention, the present invention can also be further optimized, and the following is the technical scheme formed after optimization:

Preferably, the engaging structure is a tooth engaging structure. More preferably, the tooth engagement structure includes a first tooth arranged on the outer end surface of the nut and a second tooth arranged on the inner end surface of the anti-loosening cover, and the first tooth and the second tooth are engaged and connected.

In order to ensure that there is a gap between the end of the screw and the bottom wall of the cavity.

In order to ensure the consistency of force transmission and avoid the possible loosening failure of the existing anti-loosening bolts as shown in Figure 13, the anti-loosening cover of the utility model is an integrated structure, so that it can be completely anti-loosening.

In order to easily take out the residual anti-loosening screw in the inner threaded hole of the coupling bolt due to disassembly and assembly, the outer end surface of the anti-loosening cover is provided with a non-circular counterbore extending to the anti-loosening screw section. Preferably, the counterbore is a square hole.

With the above structure, the utility model opens an internal thread blind hole in the screw rod along the normal direction at the center of the end face of the screw rod, and the thread direction is opposite to the direction of rotation of the external thread of the screw rod.

The nut is processed on the basis of the structural characteristics of ordinary hexagonal nuts into a flat end surface, and the flat surface is covered with small serrations with tooth width along the radial direction.

The anti-loose cover is an end cover with cavity, screw, side, top surface and bottom surface, and has six sides; the outer top surface is a plane, and the outer top surface is perpendicular to the center of the outer top surface. Square blind hole, the depth of the hole is less than the length of the anti-loosening screw section; the outer bottom surface is the joint surface between the anti-loosening cap and the anti-loosening nut when the anti-loosening cap is tightened, and the outer bottom surface of the anti-loosening cap is also covered with tooth width along the radial direction Small serrations, but the inclination direction of the serrations is opposite to the inclination direction of the serrations on the end face of the locknut; the thread direction of the anti-loosening screw section is opposite to that of the anti-loosening bolt thread.

When installing the bolts, insert the bolts into the bolt mounting holes of the two workpieces, put on the nuts, and tighten the nuts, paying attention to make the serrated plane of the nuts face outward. An anti-loose cover is placed on the end cover of the screw rod, and the concave cavity of the anti-loose cover forms a cooperative relationship with the part of the screw rod exposed outside the nut, and the two cannot be in contact with a slight gap between them. The screw tightening direction of the anti-loosening cover is opposite to that of the nut, and the direction in which the nut is loose is the direction in which the anti-loosening cover is tightened. When the anti-loosening cap is tightened, the small serrations on the outer bottom surface of the anti-loosening cap and the small serrations on the joint surface of the nut form a meshing relationship. In this way, if the nut becomes loose, the anti-loosening cap will be driven by the serrations to further tighten the anti-loosening cap. The engagement action of the serrations fully guarantees that the anti-loosening cover itself will not loosen. This anti-loosening device is very reliable, especially suitable for permanent bolt connections that do not need to be disassembled.

The square counterbore on the outer top surface of the anti-loosening cover is mainly used to take out the anti-loosening screw section remaining in the threaded hole of the screw when the anti-loosening screw section breaks due to careless disassembly.

The anti-loosening cover can be made of steel or aluminum alloy. The permanent bolt connection is suitable for the steel anti-loosening cover, and the bolt connection that needs to be disassembled is suitable for the aluminum alloy anti-loosening cover.

Compared with the prior art, the beneficial effect of the utility model is: the utility model can realize very reliable anti-loosening of the bolt connection; Take out the remaining anti-loosening screw section that is accidentally broken off in the inner threaded hole of the connecting bolt.

Below in conjunction with accompanying drawing and embodiment the utility model is described further.

Description of drawings

Fig. 1 is the structure schematic diagram of an embodiment of the utility model;

Figure 2 is a top view of the bolt connection;

Fig. 3 is a partial enlarged view in the top view of the bolt connection;

Fig. 4 is the top view of bolt;

Fig. 5 is the front view of bolt;

Figure 6 is a front view of the nut;

Fig. 7 is the A direction view in the front view of the nut;

Figure 8 is a top view of the nut;

Figure 9 is a front view of the anti-loosening cover;

Figure 10 is a top view of the anti-loosening cover;

Figure 11 is a sectional view of A-A in the top view of the anti-loosening cover;

Fig. 12 is a structural schematic diagram of an existing anti-loosening bolt;

Fig. 13 is a structural schematic diagram of another existing anti-loosening bolt.

In the picture

1-screw; 2-nut; 3-lock cover; 4-threaded hole; 5-first tooth; 6-second tooth; 7-locking screw section; 8-cavity; Outer bottom surface; 11-side; 12-outer top surface; A-nut fastening direction; B-anti-loose cover fastening direction.

detailed description

An anti-loosening bolt, as shown in Fig. 1, Fig. 2 and Fig. 3, is composed of a screw rod 1, a nut 2 and an anti-loosening cover 3. After the nut 2 is tightened, a small section of the tail end of the screw rod 1 will be exposed, preventing the The loose cover 3 is on the outside of the nut 2, and the concave cavity of the anti-loose cover 3 forms a cooperative relationship with the exposed section of the screw rod 1, but the two cannot contact, and a certain gap needs to be maintained. The screw rod 1 and the nut 2 play the role of fastening the workpiece, and the anti-loosening cover 3 plays the role of preventing the nut 2 from loosening.

When tightening the workpiece, insert the screw 1 into the bolt mounting hole of the workpiece, screw the nut 2 into the tail end of the screw 1, and pay attention to make the end of the nut 2 with serrations face outward until the workpiece is fastened.

Then install the anti-loose cover 3, screw the screw rod of the anti-loose cover 3 into the threaded hole at the tail end of the screw rod 1 in the direction opposite to the direction in which the nut 2 is screwed into the screw rod 1, and screw it to the serrated surface of the anti-loose cover 3 and the nut. 2 until the serrations are partially meshed. When the screw rod of the anti-loosening cover 3 is screwed into the threaded hole at the tail end of the screw rod 1, the anti-loosening cover 3 gradually moves closer to the nut 2 until the nut 2 is properly compressed. Since the sawtooth directions of the two surfaces are opposite, after the serrated surface of the anti-loose cover 3 and the serrated surface of the nut 2 are partially meshed, the anti-loose cover 3 cannot be unscrewed, because the direction in which the anti-loose cover 3 is unscrewed is the nut 2. tight direction. At the same time, the nut 2 will not loosen, because the loosening direction of the nut 2 is the screwing direction of the anti-loosening cover 3 . Therefore, the anti-loosening effect of this anti-loosening method is very reliable, especially suitable for the situation of permanent bolt connection.

The square hole opened in the anti-loose cover 3 is used to take out the remaining screw rod from the threaded hole at the tail end of the screw rod 1 when the screw rod is accidentally broken when the anti-loose cover 3 is disassembled.

The serrations of the nut 2 and the anti-loosening cover 3 can be a hypotenuse in the tooth length direction of one side, and a right-angle side in the tooth depth direction of the other side, which is especially suitable for the anti-loosening of permanent bolted connections. It can also be that two sides of the sawtooth are hypotenuses. In this case, if the anti-loosening cover 3 is made of aluminum alloy, the anti-loosening cover 3 can be disassembled, but the anti-loosening cover 3 can not be reused after disassembly.

The above-mentioned embodiments should be understood that these embodiments are only used to illustrate the utility model more clearly, and are not intended to limit the scope of the utility model. After reading the utility model, those skilled in the art will understand each aspect of the utility model Modifications in various equivalent forms all fall within the scope defined by the appended claims of this application.

Claims (7)

1. a check bolt, including screw rod (1) and nut (2)；It is characterized in that, in the end of described screw rod (1) equipped with anti- Pine lid (3), the end of described screw rod (1) has the screwed hole reverse with its external screw thread, and described Anti-loosing-cover (3) has and screw rod (1) the anti-loosening screw section (7) matched in end thread hole, described Anti-loosing-cover (3) has the recessed of receiving described screw rod (1) end Chamber (8), the inner face of the outer wall of this cavity (8) forms occlusion structure with the outer face of described nut (2)；Described Anti-loosing-cover (3) Contrary with the thread rotary orientation between screw rod (1) and the thread rotary orientation between described nut (2) and screw rod (1).

Check bolt the most according to claim 1, it is characterised in that described occlusion structure is tooth engaging conformation.

Check bolt the most according to claim 2, it is characterised in that described tooth engaging conformation includes being arranged on nut (2) First tooth (5) of outer face and the second tooth (6) being arranged on Anti-loosing-cover (3) inner face, this first tooth (5) and the second tooth (6) Between engagement be connected.

4. according to the check bolt one of claim 1-3 Suo Shu, it is characterised in that described screw rod (1) end and cavity (8) end Gap is there is between wall.

5. according to the check bolt one of claim 1-3 Suo Shu, it is characterised in that described Anti-loosing-cover (3) is integrated.

6. according to the check bolt one of claim 1-3 Suo Shu, it is characterised in that open on the outer face of described Anti-loosing-cover (3) The not rounded counterbore that oriented anti-loosening screw section (7) extends.

Check bolt the most according to claim 6, it is characterised in that described counterbore is square hole.