Nippon Oil Company

Nippon Oil Corporation

Ntn Corporation

Nsk Corporation

Nippon Mitsubishi Oil Corporation

Nachi - Fujikoshi Corporation

Souichi Nomura

Hirotugu Kinoshita

Masaru Mishima

Hirotsugu Kinoshita

Fumihiro Itano

Takashi Arai

Kiyomi Sakamoto

Michiharu Naka

Atsushi Yokouchi

Shinichi Takabe

Kenichi Iso

Hideki Koizumi

Yukio Hasegawa

Tamio Akada

Kazuo Azuma

Takashi Takata

Akihiko Kominami

Mitsuru Kishimoto

Akira Kohno

Sakamoto Kiyomi

A grease composition containing a lubricant base oil, diurea compounds represented by the following general formulas (1) to (3), and at least one species selected from the group consisting of paraffin oxides and phosphorus compounds; wherein respective contents of the diurea compounds represented by the following general formulas (1) to (3) satisfy conditions defined by the following expressions (4) and (5); and wherein the total content of the paraffin oxides and phosphorus compounds is 0.1 to 15 mass % based on the total amount of the grease composition: where Ris a hydrocarbon group containing an aromatic ring, Ris a divalent hydrocarbon group, and Ris a hydrocarbon group containing an aliphatic ring;5&#x2266;&#x2266;30&#x2003;&#x2003;(4)0.3&#x2266;(+0.5&#xd7;)/()&#x2266;0.7&#x2003;&#x2003;(5)where W, W, and Ware respective contents (mass %) of the diurea compounds represented by general formulas (1) to (3) based on the total amount of the grease composition.

Grease composition

The grease composition of the present invention contains, in a lubricant base oil, 0.01 to 10% by mass of a fatty acid salt, 0.01 to 10% by mass of carbonate, 2 to 30% by mass of a thickener, and 0.1 to 20% by mass of a sulfur type extreme-pressure agent on the basis of the total amount of composition.

A grease composition for rolling bearings is disclosed which contains:

Grease composition for rolling bearing

A grease composition for constant-velocity joints which is prepared by blending a lube base oil with (A) a urea-urethane thickening agent comprising a mixture of

Grease composition for constant-velocity joints

Grease compositions for rolling bearing

A grease composition for a constant velocity joint contains a base oil containing 2 to 25 wt. % of a thickener based on total weight of the composition, 0.5 to 20 wt. % of boron nitride powders based on total weight of the composition, and 0.1 to 10 wt. % of an extreme pressure agent based on total weight of the composition selected from the group consisting of molybdenum dithiocarbamate, a sulfur and phosphorus-containing extreme pressure agent, and mixtures thereof. The boron nitride powders have mean particle size of more than 5 .mu.m and not more tha 20 .mu.m.

Grease composition for constant velocity joint

A grease composition for a constant velocity joint involves a base oil containing a thickener and boron nitride powders and optionally an organozinc compound.

Grease composition for constant velocity joint comprising boron nitride

A grease composition for a constant velocity joint contains a base oil containing 2 to 25 wt.% of a thickener based on total weight of the composition, 0.5 to 20 wt.% of boron nitride powders based on total weight of the composition, and 0.1 to 10 wt.% of an extreme pressure agent based on total weight of the composition selected from the group consisting of molybdenum dithiocarbamate, a sulfur and phosphorus-containing extreme pressure agent, and mixtures thereof. The sulfur and phosphorus-containing extreme pressure agent consists of a sulfur-containing compound and a phosphorus-containing compound. The sulfur-containing compound is selected from the group consisting of a sulfide of fats and oils, a polysulfide, and mixtures thereof. The phosphorus-containing compound is selected from the group consisting of a phosphate, a phosphite, and mixtures thereof.

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Tokyo, Japan

Souichi Nomura