Combined nut with anti-loosening function

Abstract

The purpose of the present invention is to provide a combined nut which comprises a pair of nuts and a lock nut disposed between the pair of nuts, and which has a lock function for preventing loosening of a screw tightening body that rotates in a return manner. The purpose of the present invention is to achieve a firm tight connection of a tightly connected member and a firm locking of a threaded tight connection body with a low fastening torque and a small amount of fastening operation. A pair of outer fastening nuts (24A, 24B) on which a fitting recess (30) is formed are disposed so that the fitting recess (30) faces each other; a lock nut is arranged between the outer fastening nuts (24A, 24B), wherein a pair of outer cone-frustum-shaped lock nut parts (40a, 40b) are integrally formed in an inverted symmetrical shape in a manner of sharing the large-diameter ends (41) of the lock nut parts (40a, 40b); the common large-diameter end (41) is screwed with the bolt (10) in a manner that the common large-diameter end (41) protrudes from the seat surface of each of the outer fastening nuts (24A, 24B) by a specified height.

Description

technical field [0001] The present invention relates to a nut that can prevent loosening of the threaded body accompanying return rotation and is used in a threaded joint composed of a bolt and a nut for fastening a plurality of components to be fastened together, and more particularly The invention relates to a combination nut for a screw-connected body, which can obtain the required bolt axial force with a low tightening torque, and can perform an efficient tightening and locking operation simply and with high reliability at the work site. Background technique [0002] As a threaded joint such as a bolt-nut joint used to fasten and fasten a plurality of fastened members, a fastening bolt and a nut screwed to the fastening bolt are generally used to hold the fastened member. The nut is fastened between the head of the fastening bolt and the nut seat surface, and the member to be fastened is fastened and fixed by the bolt axial force (tightening axial force) which is the ten...

AI Technical Summary

Problems solved by technology

However, especially in large-scale bridges, elevated roads, mechanical prime movers that use heat, water or electricity as driving energy, and transportation devices such as ships, aircraft or automobiles equipped with these prime movers, they are always exposed. The threaded tight body used in the structure under the external force of various forms such as mechanical vibration, even if the rotational looseness of the screwed fastened body is small but continues to occur, it will cause damage to the strength of the structure. The decline of the tight-connected axial force to a degree that cannot be ignored in terms of reliability and reliability results in major flaws in the original functions and safety of these structures.

In particular, when the rotation looseness of the threaded body becomes large, not only the fastening function as the threaded body is lost, but also the fatigue failure or fall-off of the bolts used at the same time occurs, and as a result, the structure may cause serious damage. ACCIDENT

Images