US2005178817A1PendingUtilityA1

Friction spot joint structure

Assignee: MAZDA MOTORPriority: Feb 16, 2004Filed: Dec 15, 2004Published: Aug 18, 2005

Est. expiryFeb 16, 2024(expired)· nominal 20-yr term from priority

Inventors:Kenji Takase Tomoyuki Iwashita Kikuo Kato Toshiyuki Gendou

D04H 1/4291D04H 13/00D04H 1/4382D06C 7/00B23K 20/1265D06C 15/00

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References

Claims

Abstract

In a friction spot joint structure, a first plate member is pressed against a second plate member by using a rotary tool and a receiving member. A concave portion is formed by a rotating pin portion of the rotating tool, with an interface between the first plate member and the second plate member remained. In this time, the first and second plate members are allowed to plastic-flow, so that an annular bulging portion of the second plate member raised into the first plate member is formed around the concave portion.

Claims

exact text as granted — not AI-modified

1 . A friction spot joint structure in which a fist plate member and a second plate member are point joined with each other by plastic flow in a manner that using a rotary tool having: a pin portion at a tip end thereof and a shoulder portion having a larger diameter than that of the pin portion at a base end of the pin portion; and a receiving member arranged so as to face the rotary tool in an axial direction of a rotary axis, the first plate member and the second plate member overlapped with each other is interposed between the rotary tool and the receiving member, the pin portion is pressed into the first plate member while rotating the rotary tool, and the shoulder portion is pressed against the first plate member in the axial direction, comprising: 
 a concave portion formed by the pin portion and including a continuous interface between the first plate member and the second plate member; and    an annular bulging portion of the second plate member which protrudes by plastic flow into the first plate member around an entire outer periphery of the concave portion.    
   
   
       2 . The friction spot joint structure of  claim 1 , wherein 
 a protruding portion is formed so as to protrude outward from the annular bulging portion.    
   
   
       3 . The friction spot joint structure of  claim 1 , wherein 
 the first plate member and the second plate member are made of a light metal.    
   
   
       4 . The friction spot joint structure of  claim 2 , wherein 
 the first plate member and the second plate member are made of a light metal.

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