Retaining structure for tightening nut in portable power working machine and method for assembling the tightening nut

摘要

A structure for preventing the falling of a fastening nut of a portable power working machine that can reliably prevent loss of the nut while suppressing the production and component costs, allows for easy operation of attaching a nut anchor member to a cover, and can increase the maintenance property, suppress damage and failures, increase the durability, and reduce the size and weight; and a method for attaching the fastening nut to a cover are provided. The structure includes a nut locking member (50), which is inserted through a bolt insertion hole from a back surface side of a cover (20) so that movement of the nut locking member (50) to a front surface side is prevented, and has a split cylindrical shape with elastically deformable leg-like piece portions; an anchoring cylindrical portion (45) with a predetermined length functioning as a nut anchor member (50), the anchoring cylindrical portion (45) being provided in a protruding manner and coaxially with the nut on a seating surface side, being adapted to be inserted through the bolt insertion hole, and being relatively difficult to elastically deform with respect to the nut locking member (50). A protruding end of the anchoring cylindrical portion (45) of the nut has formed continuous therewith a hook portion (46) that bends inward along its entire periphery. Each end of the leg-like piece portion of the nut locking member (50) has formed continuous therewith a locking claw portion (46) that bends outward to lock the hook portion (46).