Abstract: A rotation support device for flying object has a stationary body having double-row outer ring raceways on an inner circumferential surface thereof and capable of supporting a motor stator, a rotating body having double-row inner ring raceways on an outer circumferential surface thereof and capable of supporting a motor rotor and a propeller, and a plurality of rolling elements arranged between the double-row outer ring raceways and the double-row inner ring raceways so as to be able to roll freely, at least one outer ring raceway of the double-row outer ring raceways directly formed on the inner circumferential surface of the stationary body and/or at least one inner ring raceway of the double-row inner ring raceways directly formed on the outer circumferential surface of the rotating body 3.

Abstract: Provided are a grease composition and a rolling device which can prevent a decrease in seal performance even when a low-viscosity base oil having, for example, a kinematic viscosity of 5 to 40 mm2/s is used, and can achieve both seal performance and low torque. A seal member (12a) has a plurality of seal lips (114), (115), and (116) made of an elastic material, and a grease composition is sealed in gap portions (121) and (122) between a sliding surface of a slinger (106) on which the seal lips slide and the two adjacent seal lips. The grease composition contains a base oil and a polar polymer, and a weight-average molecular weight of the polar polymer is from 5000 to 140000.

Abstract: The present invention provides a grease composition which makes it possible to prevent deterioration in sealing properties even when base oil having a kinetic viscosity of as low as, for example, 5-40 mm2/s is used and which makes it possible to realize both sealing properties and a decrease in torque. The present invention also provides a rolling device. A sealing member (12a) comprises a plurality of sealing lips (114), (115), (116) each of which is made of an elastic material. A grease composition is sealed in void parts (121), (122) that are each located between a sliding surface of a slinger (106), on which the plurality of sealing lips slide, and two adjacent sealing lips. This grease composition contains base oil and a polar polymer. The polar polymer has a weight-average molecular weight of 5,000-140,000.

Abstract: Provided is a rolling bearing using a retainer, particularly a highly reliable retainer in which dimensional stability required for a retainer of an outer ring guide type, ductility required for a crown-type retainer, improvement in adhesion of grease with a poly-?-olefin oil or the like as a base oil, and deformation prevention at a high speed can be achieved. The rolling bearing includes at least an inner ring 1, an outer ring 3, a synthetic resin retainer 9, and a rolling element 7, in which the synthetic resin retainer 9 is formed of a polyamide resin composition including polyamide 410 and a reinforcing fiber material with a content of 0% by weight to 40% by weight.