Abstract: To provide a rolling bearing excellent in long-term durability. A rolling bearing includes: an inner ring and an outer ring disposed coaxially with each other; a rolling element disposed between the inner ring and the outer ring; a seal member mounted on the outer ring and configured to cover a space between the inner ring and the outer ring from an outside in an axial direction; and grease disposed between the rolling element and the seal member. The grease is in contact with an inner circumferential surface of the outer ring and the seal member. Unworked penetration of the grease is more than 178 and less than 287.

Abstract: A bearing grease includes a base oil and a thickener, and the base oil includes mineral oil and poly-?-olefin. The poly-?-olefin may be a blend of poly-?-olefin having a kinetic viscosity higher than that of the mineral oil and poly-?-olefin having a kinetic viscosity equal to or lower than that of the mineral oil, and the kinetic viscosity of the base oil at 40° C. is in a range of 40 through 90 mm2/s. The amount of the poly-?-olefin by mass in the base oil is greater than the amount of the mineral oil by mass in the base oil. The worked penetration of the grease is in a range of 200 through 250. The grease reduces flying grease and outgas and has superior low-temperature characteristics.

Abstract: A grease for a rolling bearing of an information recording and reproducing apparatus contains a base oil, a thickener, and at least one kind of an antioxidant selected from an amine-based antioxidant expressed by the General Formula (1), and a phenol-based antioxidant expressed by the General Formula (2). The base oil contains a refined mineral oil classified as Group III in a base oil category defined by the American Petroleum Institute, and the flash point of the refined mineral oil is 240° C. or higher.

Abstract: Grease comprises a base oil and a thickener. The base oil contains mineral oil and poly-?-olefin, the proportion of the mineral oil is 10% by mass to 40% by mass in 100% by mass of the base oil, and a kinematic viscosity v1 of the mineral oil at 40° C. is higher than a kinematic viscosity v2 of the poly-?-olefin at 40° C. The base oil comprises a refined mineral oil that is classified as Group III in a base oil category defined by the American Petroleum Institute, and the flash point of the refined mineral oil is 240° C. or higher. A rolling bearing contains the grease, a rolling bearing device includes a shaft supported by the rolling bearing device, and an information recording and reproducing apparatus includes the rolling bearing device.

Abstract: The invention has an object of providing grease reduced in an amount of the flying grease and an amount of the outgas, and superior in low-temperature characteristic, an antifriction bearing using the grease, an antifriction bearing device, and an information recording/reproducing device. A grease includes a base oil, and a thickener, the base oil includes mineral oil and poly-?-olefin, the poly-?-olefin is higher in mass than the mineral oil, the poly-?-olefin includes poly-?-olefin higher in kinetic viscosity than the mineral oil, the kinetic viscosity of the base oil at 40° C. is in a range of 40 through 90 mm2/s, and worked penetration is in a range of 200 through 250. Further, an antifriction bearing, an antifriction bearing device, and an information recording/reproducing device use the grease.

Abstract: A grease composition includes a base oil, a thickener and at least one kind of an antioxidant selected from an amine-based antioxidant and a phenol-based antioxidant expressed by the following respective general formulas (1) and 2: The base oil contains a poly-?-olefin and a mineral oil. A mass ratio of poly-?-olefin/mineral oil is 1.25 to 9.

Abstract: Provided is grease for a rolling bearing of an information recording and reproducing apparatus 1, containing a base oil, a thickener, and at least one kind of an antioxidant selected from an amine-based antioxidant (A) expressed by the General Formula (1), and a phenol-based antioxidant (B) expressed by the General Formula (2).

Abstract: Provided is grease for a rolling bearing of an information recording and reproducing apparatus 1, containing a base oil, a thickener, and at least one kind of an antioxidant selected from an amine-based antioxidant (A) expressed by the General Formula (1), and a phenol-based antioxidant (B) expressed by the General Formula (2).

Abstract: Provided are grease containing a base oil and a thickener, a rolling bearing including the grease, a rolling device 6, and an information recording and reproducing apparatus 1. The base oil contains mineral oil and poly-?-olefin, a proportion of the mineral oil is 10% by mass to 40% by mass in 100% by mass of the base oil, and a kinematic viscosity ?1 of the mineral oil at 40° C. is higher than a kinematic viscosity ?2 of the poly-?-olefin at 40° C.