spontaneous unwinding of threaded connections entails a risk of premature failure of a variety of machines and mechanisms.Grover Washer effectively prevent this undesirable phenomenon, but it has its drawbacks.Firstly, this extra assembly unit, and secondly, at its regular disassembly may simply forget to put in place.
How to do without the puck Grover
old way is screwing the locknut, then there is one nut wrapped on top of the primary.This method is effective, but does not always apply, particularly in those cases where the important weight of the machine or mechanism, for example, in aircraft or space-rocket technology.
In order to improve the performance of the production of almost all branches of engineering, came up with self-locking nut, that is, such that vibration and other mechanical vibrations uneasy.
achieve this result in several ways.
Different types of self-locking nuts
first method of improving the stability of the threaded connection is to perform mounting parts so that the nuts self-locking when screwing tested for turns elastic deformation, which is provided by the so-called "interference" that is, the positive tolerance, ensuring highfriction during tightening.
Such strains can also be achieved when cutting raznoshagovoy nuts and bolts.Each next turn, this difference will increase the force required to disassemble the unit that will eliminate arbitrary self-unscrewing.
There is also self-locking nuts with nylon ring, by which the mechanical braking of any of their stroke after screwing.The elastomeric liner also acts as an additional damper, i.e. the absorber mechanical vibrations, which also has a positive effect on the reliability of the threaded connection.
means of solving the problem also serves as a thickening in the lower part with a special notch, creating increased friction when it is pressed to the surface fixed by the details.Such self-locking nut is easy to learn, they differ greatly in appearance from their normal counterparts hex.
original solutions
There are other ways of preventing unwanted and untimely unscrewing.For the compounds which do not undergo during the operation of significant mechanical loads, can be used stamped sheet metal self-locking nuts, creating an increased resistance during the back due to the resilient properties of the material of manufacture.
possible and the use of additional gear rims, enshrined in the bottom of the fastener.Leveraging the friction at the contact points, the projections firmly fix his position.
Despite the variety of forms, any fastener made according to national and international standards, including the self-locking nut.GOST 5915-70 and DIN 985 are documents governing their size (and they come with both metric and inch thread) and material (normal steel, alloy or stainless steel).
