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What is the development process of locknut

2020-04-22

The locknut originates from abroad. It is permanently attached to the thread with special engineering plastics, so that the internal and external threads are tightened. The engineering plastic is squeezed to produce a strong reaction force, which greatly increases the internal and external threads. Friction provides absolute resistance to vibration.
This resistance is completely distributed in the entire meshing section of the internal and external threads, and the friction force has nothing to do with the tightening pressure between the internal and external threads. It is different from the previous anti-retraction method, and it depends on the friction force generated by the pressure of the screw after tightening It has the function of stopping retreat. Once the screw is slightly loosened and the pressure is reduced, the frictional force disappears quickly and the retreating effect is lost, so that the screw is loose. However, the plastic anti-loosening method is affected by the environment and cannot meet the requirements of high temperature and severe cold. A new anti-loosening technology must be explored.
The locknut was invented in the United States 35 years ago. There is a 30-degree wedge on the tip of the traditional 60-degree tooth tip. This structure allows the bolt to be tightened with the nut. The friction is to prevent loosening.
Due to the change in the angle of the tooth shape, the normal force generated by the contact between the threads is at a 60-degree angle to the bolt axis, rather than the 30-degree angle like the normal thread. The normal pressure of the thread is much greater than the tightening pressure, therefore, the anti-loosening friction force generated will inevitably increase greatly. When the male thread crest is engaged with the female thread, the tip of the tooth at the crest is easily deformed, so that the load is evenly distributed over the full length of the contact spiral, which avoids that more than 80% of the total load is concentrated on the normal standard thread when engaged. The phenomenon on the thread surface of the first and second teeth. Therefore, the threaded coupling pair not only overcomes the shortcomings of the common standard coupling pair that is easy to loosen itself under vibration conditions, but also extends the service life.
Due to this special tooth deformation prevention method, it can be disassembled repeatedly 5 to 50 times, and the prevention function still persists. Because this anti-loosening method has high vibration resistance, light weight, and can be disassembled repeatedly, it has become the most reliable anti-loosening product today.
The anti-loosening screws are called anti-loosening screws, which are most suitable for the fastening of moving parts. They were first used in the US aerospace aircraft and later extended to the US automobile manufacturing industry. With the maturity of manufacturing technology and the reduction of costs, It is widely used in many industries such as 3C, bicycles, ice skating equipment, furniture, sports equipment, medical equipment, etc. It fully replaces the traditional backwash washer, which fully shows the reliability of the tightening and anti-loosening effect of anti-loosening screws.

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