TORQUE CONVERTER FOR AUTOMOBILE PROVIDED WITH LOCKUP DEVICE, AND METHOD FOR WELDING IMPELLER SHELL AND FRONT COVER THEREOF

WIPO Patent Application WO/2015/079742

A1

　The present invention relates to a welded structure and a laser welding method for a bonded section of an impeller shell and a front cover in a torque converter for an automobile. An impeller shell (10) and a front cover (12) have a structure in which axial tubular protrusions (10-1A, 12-1A) thereof are engaged with each other in an axial direction, and the axial tubular protrusion (12-1A) positioned on the radially outer side and an opposing abutting surface are welded in a laser welded section (14) through the entire periphery. A laser welded section (11) extends from the radially outer peripheral surface into the space between the abutting surfaces, so as to partially penetrate into the axial tubular protrusion (10-1A) on the radially inner side (depth of penetration = d). A welding beam has a rectangular cross section. The shape of the welded section (11) is configured of a tack weld leaving a gap along the circumferential direction in a first stage and a final weld in the entire periphery in a second stage, and the tack welded section has a long, thin shape so that a part thereof remains in a solidified state during the final weld.

KIKUCHI SHINSUKE (JP)
HYODO YOSHINORI (JP)
SANEISHI KOHEI (JP)

PCT/JP2014/070540

June 04, 2015

August 05, 2014

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UNIPRES CORP (JP)

F16H41/24; B23K26/21

DE19755168A1	1999-06-17
JPH0215891A	1990-01-19
JP2004063406A	2004-02-26
JPH11200397A	1999-07-27
JPH0366485A	1991-03-22
JPS59215288A	1984-12-05
JP2008057782A	2008-03-13

MITSUI, TAKAO (JP)
Takao Mitsui (JP)

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