CN205207390U - Device for preventing nut is not hard up - Google Patents

Abstract

A device for preventing nuts from loosening, including bolts, lock nuts, built-in threaded gap washers with protrusions, main nuts, flat washers and connected workpieces, the bolts are standard hexagon head bolts, and the lock nuts are special nuts, The upper end is a threaded hole and the bolt is threaded, and the lower end is a conical surface to match the upper conical surface of the built-in threaded gap washer with bumps. , the main nut is a special nut, the upper end of which is a conical surface with a notch and the lower end of the built-in thread notch washer with a protrusion. The lower end is a threaded hole and the bolt is threaded, and the flat washer is connected The workpiece is directly set on the bolt. The utility model has simple structure and reasonable design, and can effectively prevent the nut from loosening.

Description

A device for preventing nut from loosening

technical field

The utility model relates to the field of nuts, in particular to a device for preventing nuts from loosening.

Background technique

A nut is a fastener with an internal thread and used in conjunction with a bolt, a mechanical part with an internal thread and used in conjunction with a bolt to transmit motion or power. The existing ways to prevent the nut from loosening mainly include the following types:

1. Friction and anti-loosening. This method is the most widely used anti-loosening method, which generates a friction force between the thread pairs that can prevent the relative rotation of the thread pairs. For example, elastic washers, double nuts, etc. are used. In these nut loosening methods, the thread teeth are in point contact, which is easy to loosen under the condition of impact, vibration and variable load, which will eventually lead to the nut loosening.

2. The mechanical nut is anti-loose. This way is to directly limit the relative rotation of the thread pair with the stopper. Such as the use of cotter pins, series steel wires and stop washers, etc. This mode causes disassembly to be inconvenient.

3. Riveting and anti-loosening. After tightening, impact, welding, bonding and other methods are used to make the thread pair lose its motion characteristics and become a non-detachable connection. The disadvantage of this method is that the bolt rod can only be used once, and it is very difficult to disassemble, and the thread pair must be destroyed before disassembly.

Contents of the invention

Aiming at the deficiencies in the prior art, the utility model provides a device for preventing nuts from loosening with scientific design, reasonable structure, safety and reliability.

The technical scheme of the utility model is: a device for preventing nuts from loosening, including bolts, lock nuts, built-in thread gap washers with bumps, main nuts, flat washers and connected workpieces, characterized in that the specific structure and connection The way is:

The bolt is a hexagon head standard bolt, the lock nut is a special nut, the upper end of the lock nut is a threaded hole, the upper end of the lock nut is connected with the bolt through the thread, and the lower end is the cone surface and the built-in thread notch washer with the protrusion. The cone surface matches, the built-in thread notch washer with a bump has a cone surface at the upper end, a cone surface with a bump at the lower end, the main nut is a special nut, and the upper end of the main nut is a cone surface with a notch and a built-in thread with a bump The lower end of the notched washer is matched with the conical surface of the protrusion, the lower end of the main nut is a threaded hole, the lower end of the main nut is connected with the bolt through threads, and the flat washer and the connected workpiece are directly sleeved on the bolt.

The plane of the tapered surface with the protrusion of the built-in thread notch washer with the protrusion is in a plane with the lower plane of the notch of the main nut, and there is a certain gap with the lower plane of the main nut conical surface. When the built-in thread gap washer of the bump is tightened, there is a certain movement space when the thread teeth move down and closely match the thread teeth of the bolt; the bump on the built-in thread gap washer with bump is to fix the built-in screw with bump Thread gap washer to prevent jumping, so as to better cooperate with the notched cone of the main nut.

When the lock nut is screwed down into the bolt to press the built-in thread notch washer with the bump, the built-in thread notch washer with the bump will give the lock nut a reaction force, so that the threaded connection between the lock nut and the bolt will become tighter, making the structure more solid and reliable.

After the internal thread of the built-in thread gap washer with bumps is pressed by the lock nut and the main nut, the built-in thread gap washer with bumps is tightened, and the size of the internal threads becomes smaller, and the thread teeth and the thread teeth of the bolt Closely fit together, the contact surface between the thread teeth changes from point contact to surface contact, the friction force is greatly improved, and self-locking is formed to achieve the purpose of anti-loosening.

The outstanding advantages of the utility model are:

1. It is designed to be a cone-pressed and tight-fitting structure, so that when the lock nut is screwed down, the lower cone of the lock nut presses down on the upper cone of the built-in thread notch washer with protrusions and the notch of the main nut The conical surface of the built-in thread notch washer with bumps presses the lower cone surface with bumps upward, so that the built-in thread notch washer with bumps is tightened, and the contact form between the thread teeth changes from point contact to surface contact. The force is greatly improved, forming a self-locking so as to achieve the purpose of anti-loosening.

2. It is designed in the form of a cone-pressed tight-fitting structure, so that when the lock nut is screwed down into the bolt to press the built-in thread notch washer with bumps, the washer will give a reaction force to the lock nut, so that the lock nut and the bolt The threaded connection part will become tighter, and the connection will be more firm and reliable.

Description of drawings

Fig. 1 is a structural schematic diagram of the device for preventing nut loosening described in the present invention.

Fig. 2 is a front view of the device for preventing nut loosening according to the utility model.

Fig. 3 is a schematic structural diagram of the locking nut described in the present invention.

Fig. 4 is a schematic structural diagram of the main nut described in the present invention.

Fig. 5 is a structural schematic diagram of the built-in thread gap washer with protrusions before tightening according to the utility model.

Fig. 6 is a structural schematic view of the tightened built-in thread gap washer with bumps according to the utility model.

The marks in the figure are: bolt 1, lock nut 2, built-in thread notch washer with protrusion 3, main nut 4, flat washer 5, connected workpiece 6.

detailed description

The technical scheme of the utility model will be further described below by means of the accompanying drawings.

As shown in Figures 1 to 6, the device for preventing nut loosening described in the utility model includes a bolt 1, a lock nut 2, a built-in thread gap washer 3 with a bump, a main nut 4, a flat washer 5 and a connected Workpiece 6, the specific structure and connection method are:

The bolt 1 is a hexagon head standard bolt, the lock nut 2 is a special nut, the upper end of the lock nut 2 is a threaded hole, the upper end of the lock nut 2 is connected with the bolt 1 through the thread, and the lower end is a cone surface and a built-in The upper conical surface of the threaded gap washer 3 matches, and the upper end of the built-in threaded notched washer 3 with protrusions is a conical surface, and the lower end is a conical surface with protrusions. The main nut 4 is a special nut, and the upper end of the main nut 4 is a conical surface with a notch. Cooperate with the tapered surface with bumps on the lower end of the built-in thread notch washer 3 with bumps, the lower end of the main nut 4 is a threaded hole, the lower end of the main nut 4 is connected with the bolt 1 through threads, and the flat washer 5 and the connected workpiece 6 are directly set on the Bolt 1 on.

Working principle and process:

The plane on the tapered surface with the protrusion of the built-in thread notch washer 3 with the protrusion is in a plane with the lower plane of the notch of the main nut 4, and there is a certain gap with the lower plane of the cone of the main nut 4. The gap is for When the built-in thread gap washer 3 with bumps is tightened, there is a certain movement space when the thread teeth move down and closely fit with the thread teeth of bolt 1; the bumps on the built-in thread gap washer 3 with bumps are for fixing The built-in thread notch washer 3 with the protrusion prevents from jumping, so that it can better cooperate with the main nut 4 with notched conical surface.

When the lock nut 2 is screwed down into the bolt 1 and presses the built-in thread gap washer 3 with the bump, the built-in thread gap washer 3 with the bump will give the lock nut 2 a reaction force, so that the lock nut 2 and the The threaded part of the bolt 1 will become tighter, making the structure more firm and reliable.

The internal thread of the built-in thread notch washer 3 with bumps is consistent with the internal thread of the main nut 4 before tightening, and after being pressed by the lock nut 2 and the main nut 4, the built-in thread notch washer 3 with bumps is tightened , the size of the internal thread becomes smaller, the thread teeth and the thread teeth of the bolt 1 are closely matched together, the contact surface between the thread teeth changes from point contact to surface contact, the friction force is greatly improved, and self-locking is formed to achieve the purpose of anti-loosening .

Claims (2)

1. prevent a device for nut loosening, comprise bolt, locking nut, band projection disposed thread C washer, mother nut, plain washer and be connected workpiece, it is characterized in that, concrete structure and Placement are:

Described bolt is hexagon head standard bolt, locking nut is special nut, the upper end of locking nut is tapped hole, the upper end of locking nut is connected with bolt by screw thread, lower end is that the conical surface matches with the conical surface on the disposed thread C washer of band projection, disposed thread C washer upper end with projection is the conical surface, lower end is the conical surface of band projection, mother nut is special nut, the upper end of mother nut is that under being with the conical surface of notch and being with the disposed thread C washer of projection, the conical surface of end band projection matches, the lower end of mother nut is tapped hole, the lower end of mother nut is connected with bolt by screw thread, plain washer and be connected workpiece and be directly enclosed within bolt.

2. the device preventing nut loosening according to claim 1, it is characterized in that, on the band projection conical surface of the disposed thread C washer of described band projection, the lower plane of plane and mother nut notch is in a plane, and has certain gap with mother nut conical surface lower plane.