Abstract:
PROBLEM TO BE SOLVED: To provide an oil-filled electric apparatus using a vegetable oil, capable of reducing the environmental load, as an insulation oil.SOLUTION: Out of vegetable oils, a vegetable oil containing a lot of natural antioxidant is used as an insulation oil. For example, rice oil containing a lot of tocotrienol or orizanol is preferable. Since oxidation stability of insulation oil can be ensured by the natural antioxidant contained in vegetable oil, it is not required to add an antioxidant having uncertain impact on the environment to the insulation oil. Even a vegetable oil not containing a lot of natural antioxidant enhances oxidation stability without having adverse effect on the environment, when adding an antioxidant that has been approved to be used in foods. The oil-filled electric apparatus has high possibility to be utilized in a transformer or a cable, a circuit breaker, or a capacitor.
Abstract:
PROBLEM TO BE SOLVED: To provide a heat treatment oil composition which can impart excellent brightness to a workpiece even if a sulfur content is low. SOLUTION: The heat treatment oil composition is obtained by blending base oil which has a kinematic viscosity at 40°C of ≥30 mm 2 /s and contains ≤300 mass ppm sulfur with a tricyclic or more condensation polycyclic aromatic compound in an amount of 0.1 to 5 mass% based on the total quantity of the composition. By performing quenching using the heat treatment oil composition, excellent brightness can be imparted to the workpiece in spite of a low sulfur content. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a lubricant composition causing little oxidation deteriorating even in high-temperature conditions, and a rolling apparatus having a long service life in the high-temperature conditions. SOLUTION: The deep groove ball bearing includes: an inner ring 1 having a raceway 1a on the outer circumference surface; an outer ring 2 which has a raceway 2a facing the raceway 1a in the inner circumference surface and is disposed in the radial direction outside of the inner ring 1; a plurality of rolling elements 3 freely rotatably arranged between the both raceways 1a and 2a; a holder 4 holding a plurality of rolling elements 3 between the inner ring 1 and the outer ring 2; and sealing devices 5 and 5 covering the opening of a clearance between the inner ring 1 and outer ring 2. Inside a clearance part formed between the inner ring 1 and outer ring 2 to house the rolling elements 3, a grease type lubricant composition G lubricating between the raceways 1a and 2a and the rolling elements 3 is disposed. The lubricant composition G comprises a base oil, a thickener, an anti-oxidant, and a coenzyme Q. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a lubricant improved in the solubility of a polar additive into an alkylcyclopentane oil. SOLUTION: The lubricant is prepared by adding a crown ether to a lubricant composition containing an alkylcyclopentane oil and a polar additive in a ratio of 0.1-10 mole to 1 mole of the polar additive. COPYRIGHT: (C)2009,JPO&INPIT