Title:
ROLLING BEARING AND ELECTRIC MOTOR
Document Type and Number:
WIPO Patent Application WO/2022/071195
Kind Code:
A1
Abstract:
The present invention provides: a rolling bearing which is able to be decreased in the bearing torque, and helps a highly efficient motor to meet the standards; and an electric motor in which this rolling bearing is incorporated. A rolling bearing 1 according to the present invention comprises an inner ring 2, an outer ring 3, a plurality of rolling bodies 4 that are interposed between the inner ring 2 and the outer ring 3, and a grease 7 that is sealed in the space within the bearing. The grease 7 contains a base oil that has a kinematic viscosity of 40 mm2/s or less at 40°C and a thickening agent; and if n is the apparent viscosity gradient in formula (1), said apparent viscosity gradient being calculated from the apparent viscosities of the grease 7 at at least two arbitrary shear rates as determined with use of a rheometer, and v is the kinematic viscosity of the base oil at 40°C, the value of (In(v))/n (wherein In(v) represents the natural logarithm of the kinematic viscosity v) is 5 or less. With respect to the symbols in the formula, η represents the apparent viscosity (Pa·s); n represents the apparent viscosity gradient; γ represents the shear rate (s-1); and a represents the intrinsic constant of each grease.
Inventors:
OBATA TOMOHIKO (JP)
Application Number:
PCT/JP2021/035289
Publication Date:
April 07, 2022
Filing Date:
September 27, 2021
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
C10M171/02; F16C19/06; F16C33/66; H02K7/08; C10N20/02; C10N40/02
Domestic Patent References:
| WO2010047173A1 | 2010-04-29 |
Foreign References:
| JP2014074101A | 2014-04-24 | |||
| JP2015224255A | 2015-12-14 |
Attorney, Agent or Firm:
WAKI Hikaru et al. (JP)
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