摘要:
PROBLEM TO BE SOLVED: To provide a grease composition to be enclosed in a motor rolling bearing which inhibits the generation of a specific sound at low temperatures, meets low torque characteristics in a wide temperature range, has a long bearing lubricity life even at high temperatures, and excels in rust prevention against varnish.SOLUTION: The motor rolling bearing grease composition for supporting the rotor of a motor contains a pentaerythritol ester base oil having kinematic viscosity at 40°C of 20-55 mm/s, 7-13 mass% diurea thickener represented by formula (A) (wherein Ris a 6-15C divalent aromatic hydrocarbon group and Rand Rare each a cyclohexyl group or a 16-20C linear or branched alkyl group and the ratio of the molar number of the cyclohexyl group to the total molar number of the cyclohexyl group and the 16-20C linear or branched alkyl group [{(the number of the cyclohexyl group)/(the number of the cyclohexyl group + the number of the 16-20C linear or branched alkyl group)}×100] is 60-90 mol%), and a rust preventive selected from the group consisting of a polyhydric alcohol ester-based rust preventive and an organic sulfonic acid salt-based rust preventive.
摘要:
PROBLEM TO BE SOLVED: To provide a grease composition that exhibits excellent low friction property even with a low molybdenum content when used under severe sliding conditions such as high speed and high surface pressure, and a bearing, a universal joint, and a linear motion device obtained by enclosing the grease composition.SOLUTION: The grease-enclosed bearing 1 is obtained by enclosing the grease composition 7 at least in a periphery of a rolling element 4. The grease composition 7 includes a base oil, a thickener, and an additive. The additive includes molybdenum dithiocarbamate and sodium dithiocarbamate. The molybdenum content based on the whole amount of grease composition is ≤0.06 wt.%.
摘要:
PROBLEM TO BE SOLVED: To provide a grease composition which has good compatibility with boots made of rubber or thermoplastic elastomer, and which also gives low wear and low friction. SOLUTION: The grease composition for use in constant velocity joints comprises a base oil composition; at least one tri-nuclear molybdenum compound of the formula wherein L is an independently selected ligand having organic groups with a sufficient number of carbon atoms to render the compound soluble or dispersible in the oil, n is 1 to 4, k is 4 to 7, Q is selected from the group of neutral electron-donating compounds such as amines, alcohols, phosphines, and ethers, and z ranges from 0 to 5 and includes non-stoichiometric values; and at least one urea derivative thickener. COPYRIGHT: (C)2008,JPO&INPIT
摘要:
PROBLEM TO BE SOLVED: To obtain a rustproof grease composition exhibiting excellent anti-corrosive properties even without using a nitrite and a bearing filled with the rust-proof grease composition. SOLUTION: The grease composition is obtained by mixing a base oil with a thickening agent and a rustproof component. The rustproof component comprises a polybasic acid metal salt, a polyhydric alcohol containing a partially blocked hydroxy group and at least one compound selected from an organic sulfonic acid salt and a fatty acid ester as essential components. The amounts of the rustproof components are 0.1-10 parts wt. based on the total of the base oil and the thickening agent, respectively. The base oil contains at least one selected from a synergistic hydrocarbon oil and an ether oil. The thickening agent is a urea-based thickening agent and the amount of the thickening agent is 5-30 parts wt. based on the total of the base oil and the thickening agent. The grease-filled bearing has a sliding part filled with the rustproof grease composition. COPYRIGHT: (C)2006,JPO&NCIPI
摘要:
PROBLEM TO BE SOLVED: To provide a new grease composition capable of extremely reducing the friction at a lubrication site, and having excellent friction characteristics and lubrication characteristics by combining a specific additive with a urea grease. SOLUTION: The grease composition comprises (a) a base oil, (b) a urea-based thickener, (c) at least one kind of a compound selected from the group consisting of (i-1) molybdenum dithiocarbamate, (i-2) zinc dithiocarbamate, (ii-1) molybdenum dithiophosphate and (ii-2) zinc dithiophosphate, and (d) a metal salt of a fatty acid. COPYRIGHT: (C)2005,JPO&NCIPI