Title:
COMBINED BALL BEARING, MAIN SPINDLE DEVICE, AND MACHINE TOOL
Document Type and Number:
WIPO Patent Application WO/2017/022798
Kind Code:
A1
Abstract:
A front bearing (40) of the main spindle device (M) is configured such that two rows of angular ball bearings (41, 51, 42, 52) with contact angles in the same direction are arranged back to back. The angular ball bearings (41, 51, 42, 52) all have equal inner diameters, the angular ball bearings (41, 51, 42, 52) having contact angles in the same direction have equal outer diameters to each other, and the angular ball bearings (41, 51, 42, 52) having contact angles in different directions have different outer diameters from one another. In addition, with respect to at least the angular ball bearings (42, 52) having the larger outer diameters, the angular ball bearing (42) positioned on the axially outer side is set to have a larger ball diameter and contact angle than the angular ball bearing (52) positioned on the axially inner side.
Inventors:
KATSUNO YOSHIAKI (JP)
OGURI SHOICHIRO (JP)
OGURI SHOICHIRO (JP)
Application Number:
PCT/JP2016/072807
Publication Date:
February 09, 2017
Filing Date:
August 03, 2016
Export Citation:
Assignee:
NSK LTD (JP)
International Classes:
B23B19/02; F16C19/16; F16C19/56; F16C23/06
Foreign References:
| JP2006307912A | 2006-11-09 | |||
| JP2006322496A | 2006-11-30 | |||
| JP2008133887A | 2008-06-12 |
Other References:
See also references of EP 3333436A4
Attorney, Agent or Firm:
EIKOH PATENT FIRM, P.C. (JP)
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