Rolling bearing and fan motor using the same

A rolling bearing, which is lubricated with a grease, comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and
• a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material,
• wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where a kinematic viscosity of base oil at 40° C. of the grease is 10 to 90 mm2/sec, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.05.

A rolling bearing, which is lubricated with a grease, comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and
• a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material,
• wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where a kinematic viscosity of base oil at 40° C. of the grease is 10 to 160 mm2/sec, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.025.

A fan motor using a rolling bearing lubricated with a grease, the rolling bearing comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material, wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where a kinematic viscosity of base oil at 40° C. of the grease is 10 to 40 mm2/sec, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.06.

A fan motor using a rolling bearing lubricated with a grease, the rolling bearing comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material, wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where a kinematic viscosity of base oil at 40° C. of the grease is 10 to 90 mm2/sec, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.05.

A fan motor, using a rolling bearing lubricated with a grease, the rolling bearing comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material, wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where a kinematic viscosity of base oil at 40° C. of the grease is 10 to 160 mm2/sec, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.025.

A rolling bearing, which is lubricated with a grease, comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and
• a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material,
• wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where the grease including a base oil of a pour point of −30° C. or lower is used, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.06.

A fan motor using a rolling bearing lubricated with a grease, the rolling bearing comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material, wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where the grease including a base oil of a pour point of −30° C. or lower is used, at lease one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦r/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.06.

A rolling bearing, which is lubricated with a grease, comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and
• a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material,
• wherein when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where the grease containing 20 mass % or less thickener is used, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.06.

A fan motor using a rolling bearing lubricated with a grease, the rolling bearing comprising:

• an outer ring having a rolling raceway track on its inner peripheral surface;
• an inner ring having a rolling raceway track on its outer peripheral surface;
• a plurality of rolling elements disposed between the respective raceway tracks of the outer ring and the inner ring;
• and a retainer having a plurality of pockets for locking the rolling elements to freely roll and formed of resin material, wherein, when a diameter of the rolling element is taken as Da, a radial clearance gap between a pocket face of the pocket and a rolling face of the rolling element is taken as δr, and an axial clearance gap between the pocket face of the pocket and the rolling face of the rolling element is taken as δa, in the case where the grease containing 20 mass % or less thickener is used, at least one of the pockets of the retainer is shaped so that the radial clearance gap ratio δr/Da is 0≦δr/Da≦0.09, and the axial clearance gap ratio δa/Da is 0≦δa/Da≦0.06.