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Patent Searching and Data


Title:
BALL SCREW DEVICE
Document Type and Number:
WIPO Patent Application WO/2018/088540
Kind Code:
A1
Abstract:
A ball screw device (10) having: a threaded shaft (1); a nut (2); multiple first balls arranged so as to be able to rotate freely inside a helical raceway formed by a thread groove (11) in the threaded shaft and a thread groove in the nut; an inner ring raceway groove formed in the outer circumferential surface of one axial end (12) of the threaded shaft; an outer ring (41) having an outer ring raceway groove opposing the inner ring raceway groove; and multiple second balls arranged so as to be able to rotate freely between the inner ring raceway groove and the outer ring raceway groove. Rotation of the threaded shaft is converted to linear motion of the nut by means of the first balls rolling inside the helical raceway in a loaded state. The outer ring has rolling body insertion holes (44) running from the outer circumferential surface to the outer ring raceway groove, and covers (45) covering the rolling body insertion holes, and the inner surface of the covers is formed in a concave shape that forms a portion of the outer ring raceway groove.

Inventors:
KAJIHARA Yosuke (12 Kirihara-cho, Fujisawa-sh, Kanagawa 11, 〒2520811, JP)
YAMAMOTO Kazuhito (12 Kirihara-cho, Fujisawa-sh, Kanagawa 11, 〒2520811, JP)
NOBUTOMO Masahiro (12 Kirihara-cho, Fujisawa-sh, Kanagawa 11, 〒2520811, JP)
NAGAI Yutaka (12 Kirihara-cho, Fujisawa-sh, Kanagawa 11, 〒2520811, JP)
WATARAI Yusuke (12 Kirihara-cho, Fujisawa-sh, Kanagawa 11, 〒2520811, JP)
MORIYAMA Masahito (12 Kirihara-cho, Fujisawa-sh, Kanagawa 11, 〒2520811, JP)
KATSUNO Yoshiaki (5-50 Kugenumashinmei 1-chome, Fujisawa-sh, Kanagawa 01, 〒2518501, JP)
Application Number:
JP2017/040647
Publication Date:
May 17, 2018
Filing Date:
November 10, 2017
Export Citation:
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Assignee:
NSK LTD. (6-3 Ohsaki 1-chome, Shinagawa-ku Tokyo, 60, 〒1418560, JP)
International Classes:
F16H25/24; F16C19/16; F16C19/18; F16C33/64; F16C43/06; F16H25/22
Foreign References:
JP2007285480A2007-11-01
JP2002174229A2002-06-21
JP2007285480A2007-11-01
Attorney, Agent or Firm:
SUZUKI Sohbe et al. (NICHIEI Patent and Trademark Attorneys, Shiroyama Trust Tower 32F 3-1, Toranomon 4-chome, Minato-k, Tokyo 32, 〒1056032, JP)
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