Bolt and nut loosening prevention assembly

Bolt and nut loosening prevention assemblies for preventing a bolt and a nut adapted to fix a first member and a second member to each other from loosening, comprising:

• loosening prevention members (110) fitted to the bolt and the nut coupled to the first member and the second member, respectively;
• caps (130) detachably coupled to the loosening prevention members (110), respectively, to prevent the loosening prevention members (110) from rotating;
• and
• dual washers (120) fixedly coupled to the insides of the loosening prevention members (110), respectively, to prevent the bolt and the nut from loosening,
• wherein each loosening prevention member (110) comprises:
• a loosening prevention body (111) having a bolt coupling hole (112) formed thereon to fit a bolt shaft (31) of the bolt thereto;
• a ring wall (113) protruding to a given thickness from an outer periphery thereof in such a manner as to be concentric with the bolt coupling hole (112);
• a cap fitting ring (114) formed concentrically between the ring wall (113) and the bolt coupling hole (112) in such a manner as to have a lower height than the ring wall (113);
• a cap insertion groove (115) formed between the inner peripheral wall of the ring wall (113) and the cap fitting ring (114) to insert each cap (130) thereinto;
• an external ratchet (114a) formed on an inner peripheral wall of the cap fitting ring (114);
• a washer seating surface (112a) concaved radially inward from the bottom thereof with a given area on the inner bottom surface of the cap fitting ring (114);
• a pair of hook insertion long holes (115a) formed on both sides of the cap insertion groove (115) in a circumferential direction in such a manner as to be penetrated into the loosening prevention body (111) by a given length;
• and
• hook locking projections (115b) formed steppedly concave inward by a given depth from a bottom of the hook insertion long holes (115a).