| 摘要 |
PROBLEM TO BE SOLVED: To improve fretting resistance in a rolling bearing on an output shaft side of a motor that performs normal/reverse rotation such as a servomotor and a rocking motor and improve low dust generating properties in a rolling bearing on an encoder side. SOLUTION: This rolling bearing unit includes the encoder for position detection and is assembled in the motor that performs normal/reverse rotation. The rolling bearing supporting the output shaft of the motor encloses a first grease composition comprising at least one kind selected from synthetic oil and mineral oil, and containing base oil having a kinematic viscosity of 30-60 mm<SP>2</SP>/sec at 40°C, and the rolling bearing supporting the encoder encloses a second grease composition comprising at least one selected from synthetic hydrocarbon oil and ethereal oil, and containing base oil having a kinematic viscosity of 80-120 mm<SP>2</SP>/sec at 40°C. COPYRIGHT: (C)2010,JPO&INPIT |
