Double-locking fastening device

Abstract

The invention discloses a double-locking fastening device comprising a threaded rod, a main nut and a locking nut. The main nut is in screwed connection with the threaded rod; and the locking nut is in screwed connection with the main nut. The double-locking fastening device is further provided with an auxiliary lock structure which is used for locking of the locking nut itself. The threaded rod is sleeved with the auxiliary lock structure which is connected to the locking nut in a pressed manner. The double-locking fastening device is provided with the auxiliary lock structure, it is guaranteed that the locking nut does not loose under a severe work condition, and the stability of the overall locking performance of the product is improved; because the auxiliary lock structure does not make contact with the main nut and is in screwed connection with the threaded rod through nylon plastics, the auxiliary lock structure has higher shock resistance, the service life of the product is prolonged, and the repeated using frequency is increased; a locking and fixing ring bears the inner extruding force between a locking cover and the threaded rod in the radial direction, parts on the double-locking fastening device are not likely to fall off even though the fastening effect of the double-locking fastening device is completely lost, and safety accidents are effectively avoided; and the product is simple in structure, free of maintenance, low in cost and high in reliability.

Description

technical field [0001] The invention relates to the field of fasteners, in particular to the field of anti-loosening fasteners. Background technique [0002] At present, the existing anti-loosening nuts have a variety of anti-loosening means. In view of the mainstream and progressive anti-loosening means are all improved in the structure of the product to achieve the expected technical purpose, the main nuts and locking nuts are mainly used in the market. The mutual cooperation of nuts to achieve the purpose of anti-loosening can be said to be an ideal way at present. It is difficult for the anti-loosening nut to loosen without vibration and large temperature difference. However, when the anti-loosening nut is under alternating load, Such as vibration, especially in the environment of lateral vibration and large temperature difference, the connection of the locknut is relatively easy to loosen. [0003] The structural feature of the locknut is that the main nut plays the ma...

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Problems solved by technology

[0002] At present, the existing anti-loosening nuts have a variety of anti-loosening means. In view of the mainstream and progressive anti-loosening means are all improved in the structure of the product to achieve the expected technical purpose, the main nut and locking nut are mainly used in the market. The mutual cooperation of nuts to achieve the purpose of anti-loosening can be said to be an ideal way at present. It is difficult for the anti-loosening nut to loosen without vibration and large temperature difference. However, when the anti-loosening nut is under alternating load, Such as vibration, especially in the environment of lateral vibration and large temperature difference, the connection of the locknut is relatively easy to loosen

[0003] The structural feature of the locknut is that the main nut plays the main role of fastening, and the purpose of the lock nut is to lock the main nut and prevent the main nut from loosening. Due to such hierarchical locking structural factors, as long as the lock nut does not appear Loosening, the main nut is difficult to loosen, and there is no product on the market that will not loosen the lock nut

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