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Patent Searching and Data


Title:
BALL SCREW
Document Type and Number:
WIPO Patent Application WO/2016/104676
Kind Code:
A1
Abstract:
Provided is a ball screw wherein the variation in the load distribution of the ball can be reduced and the service life of the ball screw can be increased. In this ball screw, one end 6 of the nut 2 on the flange 2-2 side is closer to the end 9 on the stationary side of the threaded shaft 1 than the other end 7 of the nut 2 on the side opposite the flange 2-2, and two or more circulation paths 5a-5c are arranged in the axial direction of the nut 2, with the diameter of the balls 3a in the circulation path 5a closest to the flange 2-2 of the nut (2) being smaller than the diameter of the balls 3c in the circulation path 5c farthest from the flange 2-2 of the nut 2.

Inventors:
FUJII KENJI (JP)
YOSHINO MASAHIKO (JP)
TOGASHI TSUTOMU (JP)
Application Number:
PCT/JP2015/086173
Publication Date:
June 30, 2016
Filing Date:
December 25, 2015
Export Citation:
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Assignee:
THK CO LTD (JP)
International Classes:
F16H25/22
Foreign References:
JPH10153245A1998-06-09
JP2000320637A2000-11-24
JP2001065662A2001-03-16
Attorney, Agent or Firm:
SHIOJIMA, Toshiyuki (JP)
Toshiyuki Shiojima (JP)
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