Anti-loosening nut capable of realizing function of higher tightness during stronger vibration

Abstract

The invention discloses an anti-loosening nut capable of realizing a function of higher tightness during stronger vibration. The anti-loosening nut comprises a flange nut and a concave nut, wherein the flange nut and the concave nut are tightened to a bolt in an overlapped mode and locked by tightening pieces, a concave nut main body is a hexagonal head nut with a flange, and an internal thread tapping alignment mark A is arranged on the side surface of the concave nut, and a concave structure, an anti-loosening wedge-shaped surface A and a tightening in-place chamfer mark A are arranged on the same end surface of the concave nut main body; and a flange nut main body is a hexagon head nut, an internal thread tapping alignment mark B is arranged on the side surface of the flange nut main body, and a flange structure, an anti-loosening wedge-shaped surface B and a tightening in-place chamfer mark B are arranged on the same end surface of the flange nut main body. According to the anti-loosening nut, when a concave nut and flange nut assembly piece of the anti-loosening nut is tightened to the bolt and the tightening pieces, the structures such as an anti-loosening wedge-shaped structure, a tenon and mortise joint structure with the flange matched with a concave shape, ratchet wheel structures, and an asynchronous internal screw thread and bolt screw thread structure of the anti-loosening nut act together, and under the conditions such as strong or long-term vibration, the higher tightness can be achieved during the stronger vibration (commonly known as never loosening), and the anti-loosening function of the anti-loosening nut is still reliable and effective in a severe environment.

Description

technical field [0001] The invention relates to the technical field of mechanical fasteners, and more specifically, the invention relates to an anti-loosening nut that realizes the function of tightening with vibration. Background technique [0002] Various mechanical parts use a large number of bolts and nuts to fasten the structure. [0003] Ordinary bolts and nuts are fastened under long-term vibration or severe vibration conditions, and they are easy to retreat, loosen or even fall off, causing product function failures. Regular inspection and maintenance and re-tightening are required, which consumes a lot of human resources and costs. Therefore, it is important and For long-life mechanical products, it is necessary to adopt anti-loosening bolt and nut structures. It is reported that my country's high-speed rail uses a large number of imported and domestically produced "never loose" nuts, and a large number of anti-loosening nuts are also used on various engines. [0...

AI Technical Summary

Problems solved by technology

[0005] figure 1 The main disadvantages of NORD-LOCK (Nord-Lock) wedge washers and their anti-loosening bolts and nuts in China and Sweden are: 1. The anti-loosening function mainly depends on the relative movement of the upper and lower washers along the wedge-shaped slope, which requires high process and manufacturing precision, so Resulting in high manufacturing costs; 2. There is a potential risk of failure: in the case where the profile accuracy of the wedge-shaped surface of the upper and lower washers is insufficient or the surface is not smooth enough, when the nut is retreated by vibration, the resistance of the upper and lower washers increases and relative motion cannot be generated , the anti-loosening function will fail, the upper and lower washers will be equal to the circular washers, and the nut will continue to be vibrated until it loosens

3. Poor reliability and durability. For example, if it is applied to severe vibrations such as high-speed rail + outdoor wind and rain, when the wedge-shaped surface of the part falls into dust or is partially rusted, the above potential failure modes will also occur, which may cause Serious consequences; 3. Because of high precision requirements, the cost of imported parts from Sweden is very high, and once the cost is reduced, the products produced are worthless due to the ineffective function caused by the decrease in precision;

[0006] figure 2 China and Japan HARD-LOCK (Hadlock) will never loosen the nut. Because of its relatively reliable anti-loosening function and strong applicability to harsh environments, it is widely used in high-speed rail lines in my country. Its main shortcomings are: 1. . Although its main principle is to learn from the mortise and tenon structure of ancient Chinese buildings, the core intellectual property rights are abroad; 2. Due to patent protection and other reasons, the cost is relatively high; 3. The eccentric circles between the upper and lower nuts are matched, and the tightening torque is large. Tightening is laborious; 4. The test shows that the fastening torque is slightly attenuated and then remains stable when it vibrates violently, that is to say, although the parts do not fall off, there is a small amount of looseness, mainly because the eccentric circle structure compensates to eliminate the vibration gap The structure and function are not optimized enough

[0007] image 3 , Figure 4 , Figure 5 And the main shortcoming that the similar never loosening nut (bolt) exists is: 1, there is not in its scheme the relevant structure that compensates and eliminates the violent vibration gap, that is to say, only has the function that prevents falling off, does not have the function that prevents loosening; 2. In actual application, the fastening nut will be loose, but it will not fall off. The loosening gap is relatively large and getting bigger. Under severe vibration conditions, it will cause large vibration noise and abnormal noise

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