GREASE TO BE FILLED INTO BALL-AND-ROLLER BEARING

• Main Authors: MOTTE SHUNICHI, YAMAZAKI OSAMU
• Format: Patent
• Language: English
• Published: 09.01.2001
• Edition: 7
• 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; INDEXING SCHEME ASSOCIATED WITH SUBCLASS C10M RELATING TO LUBRICATINGCOMPOSITIONS; 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 improved in cleanness and quietness by compounding a synthetic oil mixture comprising a synthetic ester oil and a synthetic poly-α-olefin oil in a specified ratio with a thickener mixture comprising a higher fatty acid sodium salt and a higher fatty acid lithium salt, an antioxidant, and an additive to reduce the boundary lubrication state. SOLUTION: An ester oil is mixed with a synthetic poly-α-olefin oil having a pour point of -40 deg.C or lower, a flash point of 200 deg.C or higher, a viscosity index of 100 or higher, and a viscosity (40 deg.C) of 40-300 cSt in a wt. ratio of (5:2)-(1:4). The resultant synthetic oil mixtuer is compounded with 15-35 wt.% thickener mixture prepared by mixing a higher fatty acid sodium salt and a higher fatty acid lithium salt in a wt. ratio of (2:5)-(5:2), 0.3-8.0 wt.% antioxidant prepared by mixing an aminic antioxidant and a phenolic antioxidant in a wt. ratio of (3:10)-(10:3), and 0.5-7.0 wt.% additive to reduce the boundary lubrication state.