| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a different diameter pipe joint in which a weld zone is eliminated, and reliability to leakage is improved. <P>SOLUTION: The different diameter pipe joint has a bent region and an expanded pipe region integrally formed from one pipe stock. The bent region has a first straight line part and a second straight line part connected at the bent part, the inner wall face of the first straight line part is formed as a first press-formed face at least in the vicinity the bent part, the inner wall face of the second straight line part is formed as a second press-formed face at least in the vicinity of the bent part, and the first press-formed face and the second press-formed face are directly connected at the inner circumferential side of the inner wall face of the bent part or are close each other. The expanded pipe region has: an almost cylindrical large-diameter part; an almost cylindrical small-diameter part; and a shift part shifted therebetween, and the sheet thickness of the shift part is larger than that of the large-diameter part and also larger than that of the small-diameter part. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
