Fastening structure and fastened structural body

Patent metadata

Field	Value
Publication number	US-11473608-B2
Application number	US-201816205289-A
Country	US
Kind code	B2
Filing date	Nov 30, 2018
Priority date	Jan 9, 2018
Publication date	Oct 18, 2022
Grant date	Oct 18, 2022

Abstract

A fastening structure includes: plural overlapping co-fastened members, a clearance hole being formed at at least one mating face of mutual mating faces of the plural co-fastened members, and a screw utilizing frictional heat to bore a hole and form a thread, passing through the clearance hole, and fastening the plural co-fastened members together.

First claim

What is claimed is:

1. A fastening structure comprising:
a plurality of overlapping co-fastened members, a clearance hole being formed at least one mating face of mutual mating faces of the plurality of co-fastened members;
a screw utilizing frictional heat to bore a hole and form a thread, passing through the clearance hole, and fastening the plurality of co-fastened members together, wherein the clearance hole has a circular external profile in a plan view;
a marker indicating the circular external profile of the clearance hole provided at an outer face of an outermost co-fastened member; and
a recess that is recessed away from a threaded portion of the screw formed at a back face of a head of the screw,
wherein the marker protrudes and is provided at a position superimposed on the recess in a plan view,
wherein the marker is at a location separated from an axial center position of the screw,
wherein the marker is incorporated into a boss that is formed with swarf, which is generated during thread formation by the screw and which is extruded and mounds up on the outer face of the outermost co-fastened member, and the marker is contained within the recess at the head of the screw, and
wherein the marker comprises a plurality of protrusions that are disposed in a ring shape in plan view.

2. The fastening structure of claim 1 , wherein an in-plane direction width of the clearance hole is wider than a thread diameter of the screw.

3. The fastening structure of claim 1 , wherein a co-fastened member formed with the clearance hole is formed from extruded aluminum or die-cast aluminum.

4. A fastened structural body comprising:
a plurality of overlapped co-fastened members in which a clearance hole is formed at least one mating face of mutually overlapped mating faces of the plurality of co-fastened members; and
a fastened section in which the swarf generated as a result of thread formation is extruded into the clearance hole by using the fastening structure of claim 1 .

Assignees

• Toyota Motor Co Ltd

Inventors

• Kagami Ayaka
• Matsuo Yasuhide
• Hata Koi
• Nishibata Yasuhiro
• Takahashi Kohei
• Sakurai Kosuke

Classifications

• B21J5/066

  Flow drilling · CPC title

• F16B25/103 Primary

  by means of a drilling screw-point, i.e. with a cutting and material removing action · CPC title

• F16B25/0084

  characterised by geometric details of the tip · CPC title

• F16B17/008

  of sheets or plates mutually (joining sheets by riveting without the use of separate rivets F16B5/045) · CPC title

• F16B25/0021

  the material being metal, e.g. sheet-metal or aluminium (F16B25/0031 takes precedence) · CPC title