Title:
METHOD FOR PRODUCING THREADED SHAFT FOR POWER STEERING DEVICE, AND POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/057264
Kind Code:
A1
Abstract:
Provided is a power steering device comprising a rack shaft (7) obtained by joining a first member on which rack teeth are formed and a second member (7b) serving as a ball screw shaft on which a shaft-side ball screw groove (42a) is formed, wherein: the shaft-side ball screw groove (42a) is ground into the second member (7b) by having a grindstone (51) spin and revolve around the second member (7b) while causing the second member (7b) to spin about an axis (Z) thereof as the axis of rotation so as to fulfill a machining condition "g/(5×p) < w < g/p", where w is the rotational speed of the second member (7b) during the grinding of the shaft-side ball screw groove (42a), g is the rotational speed of the grindstone (51) during the grinding of the shaft-side ball screw groove (42a), and p is the length of one circumference around the axis of rotation of the shaft-side ball screw groove (42a).
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Inventors:
SATO ATSUSHI (JP)
KITAMURA KEISUKE (JP)
ABE MITSUAKI (JP)
YONEZAWA TETSUYA (JP)
MARUYAMA TATSUYOSHI (JP)
YOSHIDA OSAMU (JP)
KAGAMI KENJI (JP)
KITAMURA KEISUKE (JP)
ABE MITSUAKI (JP)
YONEZAWA TETSUYA (JP)
MARUYAMA TATSUYOSHI (JP)
YOSHIDA OSAMU (JP)
KAGAMI KENJI (JP)
Application Number:
PCT/JP2016/078248
Publication Date:
April 06, 2017
Filing Date:
September 26, 2016
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
B23G1/38; B24B19/02; B62D5/04; F16H25/22; F16H25/24
Foreign References:
| JP2009172694A | 2009-08-06 | |||
| US4930265A | 1990-06-05 | |||
| JP2016055416A | 2016-04-21 |
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
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