公开(公告)号：EP1634661A4

公开(公告)日：2007-04-25

申请号：EP04745288

申请日：2004-05-24

申请人： YAMAHA MOTOR CO LTD

发明人： NAKAJIMA TOMOYUKI ,  TASHIRO YOJI ,  YOSHINO TAMIO

IPC分类号： B21D9/15 ,  F01N13/08 ,  B21C37/06 ,  B21D9/00 ,  B21D9/16 ,  B21D9/18 ,  B21D53/84 ,  F16L9/22

CPC分类号： B21C37/157 ,  B21C37/06 ,  B21D9/15

摘要： A method and an apparatus for manufacturing a multiple tube capable of providing the tube having a bent part with excellent appearance at low cost and preventing an inner tube or an outer tube from being deformed at the bent part at which a filler is disposed. The multiple tube, comprising at least the inner tube and the outer tube, wherein the fiber-like filler is disposed between the outer and inner tubes at the bent part of the multiple tube. Slits are formed in the filler at specified pitches. Punching holes are formed in the inner tube on at least one of the downstream side and upstream side of the tube bent part thereof. Punching holes are not formed at the tube bent part.

公开(公告)号：EP1607152A4

公开(公告)日：2009-01-21

申请号：EP04722459

申请日：2004-03-22

申请人： YAMAHA MOTOR CO LTD

发明人： RACHI MAMORU ,  TASHIRO YOJI ,  YOSHINO TAMIO

IPC分类号： B21D9/07 ,  B21D9/15

CPC分类号： B21D9/15 ,  B21D9/076

摘要： A material tube (30) is bent at plural positions in its intermediate portion with both ends of the tube (30) tightly sealed with sealers (31, 32) and liquid filled in the tube (30). Pressure in the material tube (30) can be increased and reduced through the sealers. The pressure in the tube (30) is adjusted bending by bending for the plural bending processes. After one bending process is finished, the pressure in the tube (30), which pressure is adjusted to a pressure suitable for the one bending process, is adjusted from the pressure to a pressure suitable for the next bending. This reduces man-hour to increase work efficiency.