POWER STEERING DEVICE AND METHOD FOR MANUFACTURING BALL SCREW FOR POWER STEERING DEVICE

WIPO Patent Application WO/2015/129313

A1

　In the inner end part of a first connecting passage (50) formed to open in one end side of a ball circulation groove (42), a first tapered part (54) of which the inside diameter gradually decreases toward the inner-end-part opening is provided to a side distant from a second connecting passage (60) formed to open in the other end side of the ball circulation groove (42) in a circumferential range along the opening of the inner end part. In the inner end part of the second connecting passage (60), a second tapered part (64) of which the inside diameter gradually decreases toward the inner-end-part opening is provided to a side distant from the first connecting passage (50) in a circumferential range along the opening of the inner end part. The first connecting passage (50) and the second connecting passage (60) are configured so that the angle (θ1) between the first tapered part (54) and the second tapered part (64) in the rotating direction of a nut (41) is less than 180 degrees.

KITAMURA KEISUKE (JP)
SUGIYAMA HIROYUKI (JP)
MARUYAMA TATSUYOSHI (JP)

PCT/JP2015/050746

September 03, 2015

January 14, 2015

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HITACHI AUTOMOTIVE SYSTEMS STEERING LTD (JP)

F16H25/22; B62D5/04

JP2004353835A	2004-12-16
JPH0550220U	1993-07-02
JP2006275139A	2006-10-12
JP2010151018A	2010-07-08
JP2007010017A	2007-01-18
JP2003314655A	2003-11-06
JP2003269450A	2003-09-25

KOBAYASHI, Hiromichi et al. (JP)
Hiromichi Kobayashi (JP)

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