CN207848158U - Locking fastening assembly - Google Patents

Abstract

The utility model provides an anti-loosening fastening component, which belongs to the field of fastening connectors. It solves the problems of easy loosening and unreliable connection of existing fasteners. The anti-loosening fastening assembly includes a bolt and a first nut and a second nut which are sequentially sleeved on the bolt and threadedly connected with the bolt. The internal thread of the inner wall of the hole, the thread direction of the internal thread is opposite to the thread direction of the second nut connected to the bolt, and the end of the first nut close to the second nut is provided with a screw that can extend into the reaming hole The outer wall of the cylindrical part is provided with an external thread threadedly connected with the internal thread, and the thread direction of the external thread is opposite to that of the thread connecting the first nut with the bolt. The anti-loosening fastening component has simple structure, easy processing technology, low production cost, high overall connection reliability of the anti-loosening fastening component, and good anti-loosening effect.

Description

Anti-loosening fastening components

technical field

The utility model belongs to the field of fastening connectors and relates to an anti-loosening fastening component.

Background technique

Bolts and nuts are indispensable fasteners for fixing workpieces in current applications. They are simple in structure, easy to assemble and disassemble, and are widely used in various mechanical equipment. However, under the action of shock, vibration or variable load, the pre-tightening force and friction force in the bolt connection will gradually decrease or may disappear instantaneously, and ordinary fixing devices will loosen, resulting in failure of the connection. Once the bolt connection fails, it will seriously affect the normal operation of the machine and even cause accidents.

In order to overcome the loosening problem of bolts or nuts in places with vibration, many locking devices have been developed in the current technology or different materials are used to produce bolts and nuts. These locking devices generally have poor anti-loosening effects and are processed Complicated, resulting in increased costs for bolts and nuts. Therefore, improvement is urgently needed aspect fastening connector.

Contents of the invention

The purpose of this utility model is to provide an anti-loosening fastening assembly for the above-mentioned problems existing in the prior art.

The purpose of this utility model can be achieved through the following technical solutions:

The anti-loosening fastening assembly includes a bolt and a first nut and a second nut that are sequentially sleeved on the bolt and threaded with the bolt. The inner wall of the second nut near the first nut is provided with a reaming hole and is arranged on the reaming hole. The internal thread of the inner wall of the hole, the thread direction of the internal thread is opposite to the thread direction of the second nut connected to the bolt, and the end of the first nut close to the second nut is provided with a screw that can extend into the reaming hole The outer wall of the cylindrical part is provided with an external thread threadedly connected with the internal thread, and the thread direction of the external thread is opposite to that of the thread connecting the first nut with the bolt.

With the fastening structure of double nuts, the thread direction of the internal thread of the second nut is opposite to that of the thread connecting the second nut with the bolt, so that the second nut is difficult to be unscrewed, thereby providing an effective anti-loosening function.

In the aforementioned anti-loosening fastening assembly, the length of the cylindrical portion is equal to or shorter than the depth of the reamed hole.

The cylindrical part can all extend into the reamed hole, which reduces the distance between the first nut and the second nut, and strengthens the connection between the first nut and the second nut.

In the above-mentioned anti-loosening fastening assembly, the outer wall of the end of the first nut away from the cylindrical portion is provided with an outer hexagonal surface 1 .

The structure of the outer hexagonal surface is provided to facilitate loosening and tightening of the first nut with tools.

In the aforementioned anti-loosening fastening assembly, an annular shoulder 1 is provided between the outer hexagonal surface 1 and the cylindrical portion.

An annular shoulder 1 is provided to prevent the second nut from excessively moving toward the first nut, and prevent excessive extrusion between the two, resulting in damage to the fastener.

In the above-mentioned anti-loosening fastening assembly, the outer wall of the second nut is provided with an outer hexagonal surface two.

The second structure of the outer hexagonal surface is provided, which is convenient for loosening and tightening the second nut by using tools.

In the above-mentioned anti-loosening fastening assembly, two symmetrically arranged clamping planes are provided on the side of the cap end of the bolt.

The clamping plane is set to facilitate the loosening and tightening of bolts with tools.

In the above-mentioned anti-loosening fastening assembly, the end of the bolt close to the cap end is provided with a blocking protrusion.

A blocking protrusion is provided to effectively prevent the first nut from excessively moving toward the cap end, so that a certain distance is maintained between the cap end and the first nut.

In the above-mentioned anti-loosening fastening assembly, the outer diameter of the blocking protrusion is smaller than the distance between the two clamping planes.

This structure is more convenient when using tools to clamp, and the blocking protrusion will not have adverse effects on the clamping operation.

Compared with the prior art, the structure of the anti-loosening fastening assembly is simple, the processing technology is easy to grasp, and the production cost is low. The fastening structure with double nuts is adopted, and the thread direction of the internal thread of the second nut and the second The direction of rotation of the thread connecting the nut and the bolt is opposite, so that the second nut is difficult to be unscrewed, the overall connection reliability of the anti-loosening fastening component is high, and the anti-loosening effect is good.

Description of drawings

Fig. 1 is a schematic diagram of the anti-loosening fastening assembly.

Fig. 2 is a sectional view of the anti-loosening fastening assembly.

Fig. 3 is a schematic diagram of the separation structure of the anti-loosening fastening assembly.

In the figure, 1, bolt; 1a, cap end; 1b, clamping plane; 1c, blocking convex part; 2, first nut; 2a, cylindrical part; 2b, external thread; 2c, outer hexagonal surface 1; 2d, Annular shoulder 1; 3, second nut; 3a, internal thread; 3b, outer hexagonal surface 2.

Detailed ways

As shown in Figures 1-3, the anti-loosening fastening assembly includes a bolt 1, a first nut 2 and a second nut 3 that are sequentially sleeved on the bolt 1 and threaded with the bolt 1, and the second nut 3 is close to the One end inner wall of the first nut 2 is provided with a reaming hole and an internal thread 3a arranged on the reaming inner wall. The thread direction of the internal thread 3a is opposite to that of the second nut 3 connected to the bolt 1. In the first nut 2. One end near the second nut 3 is provided with a cylindrical portion 2a that can extend into the reamed hole, and an external thread 2b that is threadedly connected with the internal thread 3a is provided on the outer wall of the cylindrical portion 2a, so The thread direction of the external thread 2b mentioned above is opposite to the thread direction of the connection between the first nut 2 and the bolt 1 .

With the fastening structure of double nuts, the thread direction of the internal thread 3a of the second nut 3 is opposite to that of the second nut 3 connected to the bolt 1, so that the second nut 3 is difficult to be unscrewed, thereby providing effective anti-corrosion protection. out of function.

The length of the cylindrical portion 2a is equal to or shorter than the depth of the expanded hole.

The cylindrical part 2a can fully extend into the reamed hole, which reduces the distance between the first nut 2 and the second nut 3 and strengthens the connection between the first nut 2 and the second nut 3 .

The outer wall of the end of the first nut 2 away from the cylindrical portion 2a is provided with an outer hexagonal surface 2c.

The structure of the outer hexagonal surface-2c is provided, which is convenient for loosening and tightening the first nut 2 with tools.

An annular shoulder 2d is provided between the outer hexagonal surface 2c and the cylindrical portion 2a.

An annular shoulder-2d is provided to prevent the second nut 3 from excessively moving toward the first nut 2, and prevent excessive extrusion between the two, resulting in damage to the fastener.

The outer wall of the second nut 3 is provided with an outer hexagonal surface 2 3b.

The structure of the outer hexagonal surface 2 3b is provided, which is convenient for loosening and tightening the second nut 3 with tools.

Two symmetrically arranged clamping planes 1b are provided on the side of the cap end 1a of the bolt 1 .

A clamping plane 1b is provided to facilitate loosening and tightening of the bolt 1 with tools.

The end of the bolt 1 close to the cap end 1a is provided with a blocking protrusion 1c.

The blocking protrusion 1c is provided to effectively prevent the first nut 2 from excessively moving toward the cap end 1a, so that a certain distance is maintained between the cap end 1a and the first nut 2 .

The outer diameter of the blocking protrusion 1c is smaller than the distance between the two clamping planes 1b.

This structure is more convenient when using tools to clamp, and the blocking convex portion 1c will not adversely affect the clamping operation.

The working principle of this embodiment: first screw the second nut 3 on the external thread 2b on the first nut 2 with a wrench through the provided internal thread 3a, and then screw it to the required tightening degree, Make the second nut 3 closely fit the annular shoulder provided on the first nut 2 . Then, the combined thread formed by the combination of the nuts connected by the two nuts is threadedly connected with the bolt 1, and is screwed to the required tightening degree with a wrench. In order to improve the anti-loosening performance and anti-loosening performance. The next step is to adjust the tightening degree of the first nut 2 and the second nut 3 twice, and further tighten and screw the first nut 2 with a wrench with a small force, and the internal thread 3a of the first nut 2 continues to apply pressure to the screw rod The external thread 2b on the top until the radial and axial dimensions of both are reduced to the design requirements. Finally, the second nut 3 is reversely tightened, and the second nut 3 is reversely tightened and screwed with a small force with a wrench. At this time, the second nut 3 squeezes the first nut 2 during the reverse screwing process. , so that the pre-tightening force of the first nut 2 is greater, and the tightening is tighter, so that the first nut 2 is tightened when it is loosened. .

The specific embodiments described herein are only examples to illustrate the spirit of the present invention. Those skilled in the technical field to which the utility model belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, but they will not deviate from the spirit of the utility model or go beyond the appended claims defined range.

Claims (8)

1. locking fastening assembly, including bolt (1) and be sequentially sleeved on bolt (1) and be threadedly coupled with bolt (1) first Nut (2) and the second nut (3), which is characterized in that second nut (3) is set close to one end inner wall of the first nut (2) There is reaming and the internal thread (3a) in reaming inner wall is set, the thread rotary orientation and the second nut (3) and spiral shell of the internal thread (3a) The connected thread rotary orientation of bolt (1) can extend on the contrary, being equipped with close to one end of the second nut (3) in the first nut (2) to described Reaming in cylindrical portion (2a), be equipped with the external screw thread that is threadedly coupled with the internal thread (3a) in the outer wall of cylindrical portion (2a) (2b), the external screw thread (2b) thread rotary orientation and the first nut (2) are opposite with the thread rotary orientation that bolt (1) is connected.

2. locking fastening assembly according to claim 1, which is characterized in that described cylindrical portion (2a) length be equal to or The shorter than depth of reaming.

3. locking fastening assembly according to claim 1, which is characterized in that first nut (2) is far from cylindrical portion One end outer wall of (2a) is equipped with outer-hexagonal face one (2c).

4. locking fastening assembly according to claim 3, which is characterized in that the outer-hexagonal face one (2c) and cylindrical portion Annular convex shoulder one (2d) is equipped between (2a).

5. locking fastening assembly according to claim 1, which is characterized in that described the second nut (3) outer wall is equipped with outer Hex surface two (3b).

6. locking fastening assembly according to claim 1, which is characterized in that be equipped in side cap end (1a) of bolt (1) Two symmetrically arranged clamping planes (1b).

7. locking fastening assembly according to claim 6, which is characterized in that the bolt (1) is close to cap end (1a) One end is equipped with blocking protrusion (1c).

8. locking fastening assembly according to claim 7, which is characterized in that described blocking protrusion (1c) outer diameter is less than two The distance between a clamping plane (1b).