Jtekt Corporation

Eneos Corporation

Yurie Hagino

Takeshi Tsuda

Kazumi Sakai

Go Tatsumi

Yusuke Ayame

Kiyomi Sakamoto

A grease composition including: a base oil; a thickener; a zinc sulfonate; a polysulfide; an overbased calcium sulfonate; and triphenyl phosphite, in which a proportion of the zinc sulfonate with respect to a total mass of the base oil and the thickener is 0.030 mass % to 0.045 mass % in terms of a zinc content, a proportion of the polysulfide with respect to the total mass of the base oil and the thickener is 0.16 mass % to 0.24 mass % in terms of a sulfur content, a proportion of the overbased calcium sulfonate with respect to the total mass of the base oil and the thickener is 0.010 mass % to 0.015 mass % in terms of a calcium content, and a proportion of the triphenyl phosphite with respect to the total mass of the base oil and the thickener is 0.24 mass % to 0.36 mass %.

Grease composition, and rolling bearing

A grease composition includes base oil, a thickener, and an inorganic additive. The base oil is a poly-&#x3b1;-olefin having a base oil kinematic viscosity of 15 to 50 mm/s at 40&#xb0; C. The thickener is a diurea expressed by Structural Formula (1). The content of the thickener is 10 to 22 mass % with respect to the total amount of the base oil and the thickener. The inorganic additive is a mixture containing sepiolite and bentonite, and is organically modified. The content of the inorganic additive is 2 to 20 mass % with respect to the total amount of the base oil and the thickener.R&#x2014;NHCONH&#x2014;R&#x2014;NHCONH&#x2014;R&#x2003;&#x2003;(1)

Grease composition and rolling bearing

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Kashihara, Japan

Yurie Hagino