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Patent Searching and Data


Title:
BALL BEARING AND MAIN SHAFT DEVICE FOR MACHINE TOOL
Document Type and Number:
WIPO Patent Application WO/2018/025922
Kind Code:
A1
Abstract:
When an inner-diameter-side opening of each of a plurality of radial holes (15) in an outer race (12) is projected onto an outer circumferential surface of a retainer (14) along an extension line of the center line (X1, X2) of the radial hole (15a, 15b), at least a portion of the inner-diameter-side opening of the radial hole is located, in the axial direction, within a region between two circles each formed by connecting axial-direction ends of adjacent pockets in the retainer (14). When the center line (X1) of one of the radial holes (15a) matches the phase, in the circumferential direction, of the center (O) of a ball (13), at least a portion of a projection of the inner-diameter-side opening (30) of one of the other radial holes (15b), when the inner-diameter-side opening thereof is projected as described above, is formed so as to overlap the inner circumferential surface of the pocket (P) as viewed from the radial direction of the ball bearing (10), and the center line (X2) of the other radial hole (15b) is separated from the phase, in the circumferential direction, of the center (O) of the ball (13).

Inventors:
AMANO RYOSUKE (JP)
KATSUNO YOSHIAKI (JP)
MATSUNAGA KYOHEI (JP)
Application Number:
JP2017/028092
Publication Date:
February 08, 2018
Filing Date:
August 02, 2017
Export Citation:
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Assignee:
NSK LTD (JP)
International Classes:
F16C33/66; B23B19/02; B23Q11/12; F16C19/16; F16C33/58; F16C33/78; F16J15/06
Foreign References:
JP2013015152A2013-01-24
JP2011163465A2011-08-25
JP2009138897A2009-06-25
JPH11264420A1999-09-28
JPS6059824U1985-04-25
US3528711A1970-09-15
JP2013079711A2013-05-02
JP2016153245A2016-08-25
Other References:
See also references of EP 3495679A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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