Title:
BALL BEARING, MAIN SHAFT DEVICE FOR MACHINE TOOL
Document Type and Number:
WIPO Patent Application WO/2019/135385
Kind Code:
A1
Abstract:
Provided is a ball bearing, wherein an outer race includes a plurality of radial-direction holes that are for supplying a lubricating oil and that pierce, along the radial direction, from the outer-circumferential surface of the outer race to the inner-circumferential surface thereof. When inner-diameter openings of the plurality of radial-direction holes are projected onto the outer circumferential surface of a retainer along an extended line of the center line of the radial-direction holes, at least some of the projected inner-diameter openings will be positioned, in the rotational-shaft direction of the ball bearing, within the region of two circles that respectively join axial-direction ends of pockets in the retainer. From among the plurality of radial-direction holes, when the center line of any one of the radial-direction holes matches the circumferential phase of the center of the ball, and when the inner-diameter openings of the radial-direction holes are projected onto the outer circumferential surface of the retainer along the extended line of the center line of the radial-direction holes, as seen from the radial direction of the ball bearing, the projected inner diameter openings are spaced apart from the ball and the inner-circumferential surface of the pockets, and at least some of the projected inner-diameter openings will overlap the pockets as seen from the axial direction of the ball bearing.
Inventors:
KATSUNO YOSHIAKI (JP)
AMANO RYOSUKE (JP)
AMANO RYOSUKE (JP)
Application Number:
PCT/JP2018/048131
Publication Date:
July 11, 2019
Filing Date:
December 27, 2018
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
F16C33/66; B23B19/02; B23Q11/12; F16C19/06; F16C33/78; F16N7/32; F16N7/38
Domestic Patent References:
| WO2016125555A1 | 2016-08-11 | |||
| WO2009012753A1 | 2009-01-29 | |||
| WO2018025918A1 | 2018-02-08 |
Foreign References:
| JP2013079711A | 2013-05-02 | |||
| JP2013015152A | 2013-01-24 | |||
| US3195965A | 1965-07-20 | |||
| JPH07506896A | 1995-07-27 | |||
| JP2013079711A | 2013-05-02 | |||
| JP2018000200A | 2018-01-11 |
Other References:
See also references of EP 3736461A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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