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Title:
BALL SCREW
Document Type and Number:
WIPO Patent Application WO/2018/088506
Kind Code:
A1
Abstract:
A ball screw is equipped with: a threaded shaft (10) on the outer circumferential surface of which a helical first thread groove (11) is formed; a nut (20) arranged around the threaded shaft (10) and on the inner circumferential surface of which a helical second thread groove (21) is formed; multiple balls (30) accommodated within a rolling path (23) formed by the opposing thread grooves (11, 21); and a ball return passage (42) for circulating the multiple balls (30) through a rolling path (23) that coils around one time or less. The length (L) of the ball return passage (42) between pickup points (43a, 43b) for the balls (30) picked up from the first thread groove (11) in the threaded shaft (10) is set to a value between −0.1 to +0.3 times the diameter of the balls (30), with respect to the integer value of the number of balls filling the interval between the pickup points (43a, 43b).

Inventors:
OKA KEITARO (JP)
Application Number:
PCT/JP2017/040531
Publication Date:
May 17, 2018
Filing Date:
November 10, 2017
Export Citation:
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Assignee:
NSK LTD (JP)
International Classes:
F16H25/24; F16H25/22
Foreign References:
JP2004036789A2004-02-05
JP2004353835A2004-12-16
JP2003184985A2003-07-03
JP2012047333A2012-03-08
JP2004108395A2004-04-08
JP2003307623A2003-10-31
JPH0510412A1993-01-19
JP4462458B22010-05-12
JP2016221428A2016-12-28
Other References:
See also references of EP 3540263A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
Download PDF:
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