Abstract: The present invention provides a rolling bearing, for a tenter clip, which is capable of restraining deterioration of a sealing member even though the sealing member contacts ester oil, and is excellent in reliability and durability at high temperatures. A periphery of an outer ring of the rolling bearing for use in the tenter clip of a film-stretching apparatus is lubricated with the ester oil.

Abstract: The present invention provides a seal ring which can be prevented from being broken by an expansion and a shock applied thereto when the seal ring is fitted on a rotary shaft and does not have a configurative disadvantage such as a burr. Therefore no post-processing is required. The present invention also provides materials of the seal ring and a method of manufacturing the seal ring. The seal ring is made of resin and having two abutments confronting each other and a gate mark formed in an injection molding operation.

Abstract: It is an object of the present invention to provide an injection-molded article such as a resin-made cage, a resin-made seal, a resin-made sliding bearing, and a resin-made gear having reliable flowability, enhanced mechanical strength and toughness, and improved wear resistance. A resin composition is composed of a biodegradable polyester polymer particularly polybutylene succinate to which not less than 10 wt % nor more than 40 wt % of a fibrous inorganic reinforcing material and not less than 0.5 wt % nor more than 10 wt % of polycarbodiimide resin are added. The injection-molded article is obtained by injection molding the resin composition.

Abstract: A hub bearing, of carbon steel for machine use, which has a long life because of improved resistance to peeling starting from the surface and a grease enclosed in the hub bearing which contains a base oil and a thickener, and in the base oil, the number of naphthenic carbons found by an n-d-M ring analyzing method accounts for 32 to 37% of a whole number of carbon atoms in the base oil. The base oil is a mineral oil or a mixed oil of a mineral oil and a synthetic hydrocarbon oil. The thickener contains 1 to 40 mass % of a urea compound of formula (1): where R2 indicates an aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 indicate at least one hydrocarbon group selected from an alicyclic hydrocarbon group and an aromatic hydrocarbon group.

Abstract: The present invention provides a cage, for a rolling bearing, whose surface is silver-plated by using a barrel plating method capable of improving the durability thereof in a sliding test. In the cage, for the rolling bearing, made of an iron metal material and having a precious metal-plated layer formed on a surface thereof, the precious metal-plated layer is formed on a ground plated layer formed on a surface of the iron metal material by using a barrel electroplating method. A surface of the ground plated layer consists of a smooth surface. The precious metal-plated layer is in direct close contact with the smooth surface. The ground plated layer consists of a metal having a higher ionization tendency than the precious metal formed on the surface of the ground plated layer. For example, the precious metal forming the plated layer formed on the surface of the ground plated layer is silver, whereas the ground plated layer is a copper-plated layer.

Abstract: The present invention provides a member for a rolling bearing (1) which is capable of decreasing the amount of carbon dioxide generated from a polymeric member in discarding the rolling bearing, contributing to restraint or prevention of an increase in the concentration of the carbon dioxide in the atmosphere or a decrease of the concentration thereof in the atmosphere, and allows a continuous use temperature to be high and an endurance time to be long and a rolling bearing using the member. The member for the rolling bearing (1) is composed of a molding of a polymeric elastic body or a synthetic resin composition. The member is at least one member selected from among an inner ring (2), an outer ring (3), rolling elements (4), a retainer (5), and a sealing member (6). A raw material derived from a biomass is at least partially used for a producing raw material of a polymeric matrix composing the polymeric elastic body or the synthetic resin composition.

Abstract: The present invention provides a high-accuracy sliding bearing which eliminates the need for treating a gate mark, has a high accuracy, is excellent in its mechanical strength, and is in its productivity. A sintered metal (2) is used as a bearing peripheral part. A resin material is molded at a sliding portion of the bearing peripheral part to form a resin layer (3). In the resin layer (3), a product of a coefficient of linear thermal expansion of the resin material and a thickness of the resin layer is not more than 0.15. The resin layer (3) is molded through tunnel gates. The resin layer comprises a plurality of axial grooves (4A) and (4B) on a bearing sliding surface thereof, and the tunnel gate marks (5) are alternately formed on a bottom of each of the grooves.

Abstract: A resin composition for a sliding member is difficult to peel and whose component is difficult to elute when the resin composition is formed as a film on a surface of a mechanical part, even though the resin composition is used in environment where the sliding member contacts lubricating oil containing a sulfur-based additive or in atmosphere containing a sulfur-based compound. A resin composition for a sliding member to be used for a mechanical part having a surface thereof formed of said sliding member. The resin composition contains polyamide-imide resin having an elongation percentage of 60% to 120%, fullerene, and at least one disulfide selected from among molybdenum disulfide and tungsten disulfide. 0.1 to 10 vol % of the fullerene and 0.5 to 20 vol % of the disulfide are contained in an entirety of the resin composition.

Abstract: A conductive resin molding for use in the separator of a fuel cell and its producing method in which lowering of production yield and increase of machining cost, which are the most important problems with the spread of fuel cell, can be suppressed. The conductive resin molding is characterized by containing 1-9 vol % of high boiling point oil against the entire resin composition. Alternatively, high density expanded graphite prepared to have a specific gravity of 1.8 or above is employed as a conductive compounding agent. Alternatively, the conductive resin molding can be molded by flash flow compression molding.

Abstract: It is an object of the present invention to provide a rolling bearing in which a film formed on a surface of a retainer is difficult to peel or a metal component is difficult to dissolve even when the rolling bearing is used in environment where the rolling bearing contacts lubricating oil containing sulfur-based additives. A rolling bearing (1) having a plurality of rolling elements (3) and a retainer (2) retaining the rolling elements (3) is used in environment in which the rolling bearing contacts lubricating oil containing sulfur-based additives. A metal film difficult to peel or dissolve in the environment is formed on a surface of the retainer (2). The metal film is a copper alloy film and particularly consists of a copper-tin alloy plated film.

Abstract: A sliding material including a resinous porous article having an interconnected hole porosity of not less than 30% and a lubricating oil which impregnates the resinous porous article is disclosed. The resinous porous article has an interconnected hole formed by molding a resin mixed with a pore-forming substance into said resin, and extracting said pore-forming substance from said molded article with a solvent which dissolves said pore-forming substance and does not dissolve said resin. A sliding bearing composed of a sliding material having a sliding surface which slides on a mating member and a lubricating oil supply layer which supports the sliding material and supplies the sliding surface with the lubricating oil.

Abstract: The present invention provides a sliding material composition that is capable of continuously supplying a lubricant to the surface of a sliding portion and has a low frictionality and a low wearability. A sliding material composition of the present invention includes a resin material with which at least porous silica and a lubricant are mixed. The ratio of the sum of the mixing amount of the porous silica and that of the lubricant to the whole amount of the sliding material composition is 30 to 60 vol %. The interconnected cell ratio of the oil-containing porous silica in which the lubricant is held by the porous silica is not less than 20% when the interconnected cell ratio is found by a predetermined computing method to be carried out by utilizing the principle of a Monte Carlo method.

Abstract: A housing for fluid lubrication bearing apparatuses having improved adhesiveness with other components is provided at low costs. A housing 7 constituting a fluid lubrication bearing apparatus 1 was formed of a resin composition comprising polyphenylene sulfide (PPS) as a base resin, and the ratio of the base resin added to the resin composition was set to not lower than 40 vol % but not higher than 70 vol %. Moreover, a composition prepared by adding an epoxy compound having two or more epoxy groups per molecule of the compound and epoxy value of 0.5 meq/g or more to the resin composition so that the amount of epoxy groups in the resin composition is 8 meq/100 g or more was used. A carbon fiber was added to the resin composition comprising the base resin in an amount of not less than 10 vol % but not more than 35 vol %.

Abstract: A cam follower includes a shaft member which is cantilevered at one end and a slide bearing fitted onto the outer periphery of the other end of the shaft member. The slide bearing is composed of a cylindrical matrix made of an Fe-based sintered metal material having an Fe content of 90 wt % or more and a slide layer formed from the inner peripheral surface to the both end faces of the matrix. The slide layer is made of a slide material composition having a base material such as polyethylene resin blended with a lubricant such as silicone oil and a globular porous silica impregnated with this lubricant.

Abstract: Provided is a housing for a resin fluid dynamic bearing device in which deterioration with time of a fixing force for another member is mitigated and which can maintain a high bearing performance for a long period of time. The housing formed of a resin composition exhibiting a compression creep amount of 8% or less when a compressive pressure of 80 MPa is applied for 168 hours at an atmosphere temperature of 80° C., provides a sufficient fixing force for the another member fixed with a press-fitting force, for example, a bearing sleeve press-fitted into an inner periphery of the housing even after a long term use. Thus, there is no fear of fixing positions of the another member with respect to the housing being deviated and a high bearing performance is maintained for a long period of time.

Abstract: A hub portion of a fluid dynamic bearing device is formed from a resin composition in which polyphenylene sulfide (PPS) is employed as a base resin and with which carbon fibers are mixed. In this manner, the wear resistance and the conductivity can be improved. Alternatively, both portions of a stationary body and a rotating body of the fluid dynamic bearing device which portions face to each other through a bearing gap are formed from a resin composition in which polyphenylene sulfide (PPS) is employed as the base resin. In this manner, excellent wear resistance can be obtained.

Abstract: The present invention provides a rolling bearing, for a tenter clip, which is capable of restraining deterioration of a sealing member even though the sealing member contacts ester oil, and is excellent in reliability and durability at high temperatures. A periphery of an outer ring of the rolling bearing for use in the tenter clip of a film-stretching apparatus is lubricated with the ester oil.

Abstract: The present invention provides a seal ring which can be prevented from being broken by an expansion and a shock applied thereto when the seal ring is fitted on a rotary shaft and does not have a configurative disadvantage such as a burr. Therefore no post-processing is required. The present invention also provides materials of the seal ring and a method of manufacturing the seal ring. The seal ring is made of resin and having two abutments confronting each other and a gate mark formed in an injection molding operation.

Abstract: The present invention provides lubricating grease which is excellent in durability at a high temperature, restrains a reaction from occurring between fluorine and steel, and has a long life; and a rolling bearing in which the lubricating grease is enclosed. The lubricating grease contains perfluoropolyether oil as a base oil thereof and fluorocarbon resin powder as a thickener thereof. The lubricating grease further contains an additive containing a substance capable of forming a film on a metal surface. The substance is a diurea compound having an —NH— bond in a molecular structure thereof, an organic-acid metal salt such as sodium sebacate, molybdate such as potassium molybdate or sodium molybdate, or a bismuth-containing compound such as bismuth sulfate. The rolling bearing has an inner ring and an outer ring disposed concentrically with each other, a plurality of rolling elements interposed between the inner ring and the outer ring, and a retainer dividedly holding the rolling elements.

Abstract: The present invention provides a hub bearing, made of carbon steel for machine structural use, which has a long life even in a strict lubricating condition by improving the resistance to peeling starting from the surface. A grease for the hub bearing contains a base oil and a thickener, and in the base oil, the number of naphthenic carbons found by an n-d-M ring analyzing method accounts for 32 to 37% of a whole number of carbon atoms in the base oil. The base oil is a mineral oil or a mixed oil of a mineral oil and a synthetic hydrocarbon oil. The thickener is a urea compound shown by the following formula (1) and is contained at 1 to 40 mass % for the entire grease. The grease for the hub bearing is enclosed in the hub bearing. (In the formula (1), R2 indicates an aromatic hydrocarbon group having 6 to 15 carbon atoms, and R1 and R3 indicate at least one hydrocarbon group selected from an alicyclic hydrocarbon group and an aromatic hydrocarbon group.