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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/208510
Kind Code:
This ball screw includes: a screw shaft (10) having a spiral first screw groove (11) formed in an outer peripheral surface thereof; a nut (20) disposed on the periphery of the screw shaft (10) and having a spiral second screw groove (21) formed in an inner peripheral surface thereof; a plurality of balls (30) accommodated in a rolling path (23) formed by the opposing screw grooves (11, 21); and a circulation piece (40) that forms a ball return passage (42) for circulating the plurality of balls (30) through one circuit or less of the rolling path (23). Traffic variation is made to be small by determining the maximum angle of inclination (α) of the ball return passage (42) in an expression using the lead (L), the ball diameter (Da), and the lead angle (β).

OKA Keitaro (12 Kirihara-cho, Fujisawa-sh, Kanagawa 11, 〒2520811, JP)
Application Number:
Publication Date:
October 31, 2019
Filing Date:
April 22, 2019
Export Citation:
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NSK LTD. (6-3 Ohsaki 1-chome, Shinagawa-ku Tokyo, 60, 〒1418560, JP)
International Classes:
F16H25/22; F16H25/24
Foreign References:
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (Toranomon East Bldg. 10F, 7-13 Nishi-Shimbashi 1-chome, Minato-k, Tokyo 03, 〒1050003, JP)
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