CONSTANT-VELOCITY UNIVERSAL JOINT

WIPO Patent Application WO/2012/127995

A1

A constant-velocity universal joint (1, 31, 61) provided with an outside joint member (2, 32, 62), an inside joint member (3, 33, 63) arranged within the outside joint member (2, 32, 62), and a torque-transmitting member (4, 34, 64); a track groove (7, 9, 37, 39, 66) in which a rolling surface of the torque- transmitting member (4, 34, 64) engages being formed on the outside joint member (2, 32, 62) and/or the inside joint member (3, 33, 63), wherein the constant velocity universal joint is characterized in that at least one of the structural members of the constant velocity universal joint (1, 31, 61) comprises a metallic sintered body, the relative density of the metallic sintered body is equal to or greater than 80% and less than 100%, a layer hardened by heat treatment is formed on the surface of the metallic sintered body, and annular structural members comprising a metallic sintered body are subjected to cold-rolling.

KOHARA MIKA (JP)
SUGIYAMA TATSURO (JP)
MORI NATSUHIKO (JP)
NODA HIROYUKI (JP)
OKUNO TAKAHIRO (JP)
ASADA HAJIME (JP)

PCT/JP2012/054880

September 27, 2012

February 28, 2012

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NTN TOYO BEARING CO LTD (JP)
KOHARA MIKA (JP)
SUGIYAMA TATSURO (JP)
MORI NATSUHIKO (JP)
NODA HIROYUKI (JP)
OKUNO TAKAHIRO (JP)
ASADA HAJIME (JP)

F16D3/20; B22F3/24; B22F5/00; C22C38/00; F16C3/02; F16D3/22

JPS61502554A	1986-11-06
JPH03105726U	1991-11-01
JP2000509440A	2000-07-25
JP2010001941A	2010-01-07
JP2009079136A	2009-04-16
JP2010229433A	2010-10-14

SHIROMURA Kunihiko et al. (JP)
Kunihiko Shiromura (JP)

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