GREASE COMPOSITION AND ROLLING BEARING

• Main Authors: YOKOUCHI ATSUSHI, NAKAGAWA KAZUKI, HOKAO MICHITA
• Format: Patent
• Language: English; Japanese
• Published: 14.12.2015
• Subjects: BEARINGS; BLASTING; CHEMISTRY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; FUELS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; LUBRICANTS; LUBRICATING COMPOSITIONS; MECHANICAL ENGINEERING; METALLURGY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; TECHNICAL GASES CONTAINING CARBON MONOXIDE; THERMAL INSULATION IN GENERAL; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION; WEAPONS

PROBLEM TO BE SOLVED: To provide a grease composition capable of keeping oil separability well over a long period and extending the lubrication life in applied parts and improve the life of a rolling bearing which is rotated at high speeds at high temperatures.SOLUTION: A grease composition contains 11-15 mass%, relative to the total amount of the grease, a specified aliphatic diurea compound as a thickener in a base oil consisting a mixed oil of a hydrocarbon oil and an ester oil and having a kinematic viscosity at 40°C of 50-70 mm/s. A rolling bearing sealed with the grease composition is also provided. 【課題】油分離性を長期間良好に維持でき、適用箇所の潤滑寿命を延長し得るグリース組成物を提供する。また、高温で高速回転される転がり軸受の寿命向上を図る。【解決手段】炭化水素系油とエステル系油との混合油からなり、４０℃における動粘度が５０〜７０ｍｍ２／ｓである基油に、増ちょう剤として特定の脂肪族ジウレア化合物をグリース全量の１１〜１５質量％配合したグリース組成物、並びに前記グリース組成物を封入した転がり軸受。【選択図】図１