| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a grease composition which allows life extension by suppressing wear of bearings and fretting wear under high load at the same time.SOLUTION: A grease composition comprises a base oil and a thickener. The base oil contains at least 40 mass% of a hydrocarbon type synthetic oil and 20-70 mass% of an ingredient A of a kinematic viscosity at 40°C of 70 mm/s or lower. The base oil has a kinematic viscosity at 40°C of 200-2,000 mm/s, and the grease composition as a mixture consistency of 220-350.</p> |
