Power saving gear oil composition



【課題】 省電力性、低温流動性に優れ、かつ、高荷重で運転される機械で、極圧性も良好なギヤ油組成物を提供する。 【解決手段】 環分析による%CNが18以下で、かつ%CAが1.0以下である炭化水素系潤滑油基油(ただし、ポリαオレフィン基油を除く。)に、エチレンとエチレン以外のモノマーとの共重合体からなるオレフィン系粘度指数向上剤及び硫黄を含有する極圧剤が配合された組成物であって、前記硫黄を含有する極圧剤の配合量が該組成物の全量に対して0.1〜10質量%であり、かつ該組成物の40℃における動粘度が50〜380mm 2 /s、さらに15℃における密度が0.825〜0.846g/cm 3 であることを特徴とするギヤ油組成物。 【選択図】 なし
<P>PROBLEM TO BE SOLVED: To provide a gear oil composition having an excellent power saving property and low-temperature fluidity and also a good extreme-pressure property in a machine operated by high load. <P>SOLUTION: The gear oil composition is obtained by blending an olefin-based viscosity index-improving agent including a copolymer of ethylene and a monomer other than ethylene and an extreme pressure agent containing sulfur with a hydrocarbon-based base oil (excluding a poly-α-olefin based oil) for a lubricating oil having %CN of ≤18 and %CA of ≤1.0 by a ring analysis, the blending amount of the extreme pressure agent containing sulfur being 0.1-10 mass% based on the total amount of the composition, and a kinematic viscosity of the composition at 40°C being 50-380 mm<SP>2</SP><SB>/s</SB>and a density at 15°C being 0.825-0.846 g/cm<SP>3</SP>. <P>COPYRIGHT: (C)2011,JPO&INPIT




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