Anti-loosening method The locknut is the nut, which is […]
The locknut is the nut, which is screwed together with the bolt or screw to play a tightening role. It is an original part that all manufacturing machinery must use. The locknut is a part that tightly connects mechanical equipment through the inside Threads, lock nuts and screws of the same specifications can be connected together. The following is a detailed introduction to 4 ways to prevent lock nuts from slipping.
Is to use lock nut stopper to directly restrict the relative rotation of the lock nut pair. Such as the use of tooth opening pin, serial wire and stop washer, etc. Since the lock nut stopper has no pretension, the locknut stopper only works when the locknut nut is loosened to the stop position. Therefore, the lock nut is not loosened in practice but avoids falling.
Riveting, punching and anti-loosening
After tightening, the punching point, welding, bonding and other methods are used to make the lock nut pair lose the characteristics of the motion pair and the connection becomes a non-removable connection. The disadvantage of this method is that the bolt can only be used once, and it is very difficult to disassemble, and the bolt pair must be destroyed before it can be disassembled.
This is the most widely used anti-loosening method. This method generates a positive pressure between the lock nut pair that does not change with external force to generate a friction force that can prevent the lock nut pair from rotating relative to each other. This positive pressure can be accomplished by pressing the lock nut pair axially or simultaneously. Such as the use of elastic washers, double nuts, self-locking nuts and insert lock nuts.
Is the application of lock nut replica body structure, that is, Down's lock nut anti-loosening method.
Three advantages of locknut:
First, excellent anti-vibration performance: when the thread is tightened, the thread crest of the bolt tightly enters the 30 ° wedge-shaped slope of the nut and is clamped, and the normal force generated on the wedge-shaped slope and the bolt's The axis is at an angle of 60 ° instead of 30 °. Therefore, the normal force generated when the locknut is tightened is much greater than that of the ordinary standard nut, which has great anti-loosening and anti-vibration capabilities.
Second, strong wear resistance and shear resistance: the 30 ° slope of the bottom of the nut thread can make the nut's locking force evenly distributed on the threads of all teeth. Since the compression force on the thread surface of each tooth is evenly distributed, so Nuts can better solve the problems of thread wear and shear deformation.
Third, good performance for repeated use: a large number of use shows that after repeated tightening and disassembly of the locknut, its locking force is still not reduced, and the original locking effect can be maintained.
The commonly used self-locking anti-loosening thread fasteners are:
1. Use various self-locking bolts or ring-groove rivets to achieve self-locking;
2. Install various spring washers in the threaded connection pair to realize thread self-locking;
3. Apply self-locking on the thread.