Seiko Instruments Inc

Hiroki Yoda

Akihiro Iino

Yukihiro Nakayama

Misato Hanaoka

Hisaya Nakamura

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&#xb0; C. or higher.

Grease for rolling bearing, rolling bearing, rolling bearing device, and information recording and reproducing apparatus

Grease comprises a base oil and a thickener. The base oil contains mineral oil and poly-&#x3b1;-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 vof the mineral oil at 40&#xb0; C. is higher than a kinematic viscosity vof the poly-&#x3b1;-olefin at 40&#xb0; 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&#xb0; 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.

Grease, rolling bearing, rolling bearing device, and information recording and reproducing apparatus

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-&#x3b1;-olefin and a mineral oil. A mass ratio of poly-&#x3b1;-olefin/mineral oil is 1.25 to 9.

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Sodegaura, Japan

Hiroki Yoda