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Title:
POWER STEERING DEVICE
Document Type and Number:
WIPO Patent Application WO/2016/114021
Kind Code:
A1
Abstract:
First and second load transition regions VL1 and VL2 are provided in first and second predetermined ranges of a nut-side ball screw groove 42b from the other-end openings of first and second connecting passages 50 and 60. The first and second load transition regions are configured so that the radial distance between the rotary shaft of a nut 41 and the nut-side ball screw groove 42b gradually increases toward the other-end openings of the first and second connecting passages 50 and 60, and so that, in response to the movement of balls 43 along the nut-side ball screw groove 42b from the other-end openings of the first and second connecting passages 50 and 60, the balls 43 pass through first and second no-load regions NL1 and NL2 where the load is not transmitted from the nut 41 to a rack shaft 7, and then pass through first and second load regions ML1 and ML2 where the load is transmitted from the nut 41 to the rack shaft 7.

Inventors:
YOSHIDA OSAMU (JP)
Application Number:
PCT/JP2015/083388
Publication Date:
July 21, 2016
Filing Date:
November 27, 2015
Export Citation:
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Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
B62D5/04; F16H25/22; F16H25/24
Foreign References:
JP2004353835A2004-12-16
JPS5738829B21982-08-18
JPH0669502U1994-09-30
JP2001141019A2001-05-25
Attorney, Agent or Firm:
KOBAYASHI, Hiromichi et al. (JP)
Hiromichi Kobayashi (JP)
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