Abstract: Provided is a Cu-based sintered bearing comprising: 15-36 mass % of Ni; 3-13 mass % of Sn; 0.05-0.55 mass % of P; and 0.02-4 mass % of C in total, the balance consisting of Cu and inevitable impurities, wherein the content of C forming an alloy with a matrix within Cu—Ni-based main phase grains is 0.02-0.10 mass %.

Abstract: The oil-impregnated sintered bearing of the present invention is an oil-impregnated sintered bearing having a Fe—Cu-based sintered body being impregnated with, a bearing hole being formed in the Fe—Cu-based sintered body and configured to be penetrated by and support a rotating shaft, in which an inner circumferential surface of the bearing hole includes a first region forming a central portion in a shaft direction, a second region from a first end portion of the first region to a first opening of the bearing hole, and a third region from a second end portion of the first region to a second opening of the bearing hole, and an area ratio of the Cu phase of the second region in a center along the shaft direction is 80% or more and 100% or less of an area ratio of the Cu phase of the third region in a center along the shaft direction.

Abstract: A sintered bearing exhibits a less of a hard iron alloy phase, and has an excellent wear resistance and cost performance under low-revolution and high-load use conditions. The sintered bearing contains Cu: 10 to 55% by mass, Sn: 0.5 to 7% by mass, Zn: 0 to 4% by mass, P: 0 to 0.6% by mass, C: 0.5 to 4.5% by mass and a remainder composed of Fe and inevitable impurities. An area ratio of a free graphite dispersed in a metal matrix of the bearing is 5 to 35%; an area ratio of a copper phase in the metal matrix of a bearing surface is not less than 30%; a porosity thereof is 16 to 25%; a hardness of an iron alloy phase in the matrix is Hv 65 to 200; and raw material powders employ at least one of a crystalline graphite powder and a flake graphite powder each having an average particle size of 10 to 100 ?m.

Abstract: Provided is a Cu-based sintered bearing comprising: 15-36 mass % of Ni; 3-13 mass % of Sn; 0.05-0.55 mass % of P; and 0.02-4 mass % of C in total, the balance consisting of Cu and inevitable impurities, wherein the content of C forming an alloy with a matrix within Cu—Ni-based main phase grains is 0.02-0.10 mass %.

Abstract: An object of this heat-resistant sintered material and a production method therefor is to obtain a heat-resistant sintered material having excellent oxidation resistance, high-temperature wear resistance and salt damage resistance. This heat-resistant sintered material has a composition containing, in mass % values, Cr: 25 to 50%, Ni: 2 to 25% and P: 0.2 to 1.2%, with the remainder being Fe and unavoidable impurities, and has a structure including an Fe—Cr matrix, and a hard phase composed of Cr—Fe alloy particles dispersed within the Fe—Cr matrix, wherein the Cr content of the Fe—Cr matrix is from 24 to 41 mass %, the Cr content of the hard phase is from 30 to 61 mass %, and the effective porosity is 2% or less.

Abstract: Provided is a novel sintered oil-impregnated bearing superior in wear resistance and cost performance under a severe use condition where the bearing collides with a shaft due to a high load and vibration, such as a condition associated with an output shaft of an electric motor installed in a vehicle and a wiper motor installed therein. The sintered oil-impregnated bearing contains: 15 to 30% by mass of Cu; 1 to 4% by mass of C; and a remainder consisting of Fe and inevitable impurities, in which a metal structure with copper being melted therein is provided at least on a bearing surface; pearlite or a pearlite with ferrite being partially scattered therein is provided in a matrix; a copper-rich phase arranged in a mesh-like manner is also provided in the matrix; and a free graphite is dispersed and distributed in the matrix as well.

Abstract: A sintered bearing comprises: a bearing sleeve that is formed of a sintered material and has a shaft hole; an annular ring-shaped seal member that is disposed such that one surface thereof comes into contact with the bearing sleeve; and a washer member that comes into contact with the other surface of the seal member on a side opposite to the one surface and is configured for the seal member to engage with the bearing sleeve. The washer member is fixed to the bearing sleeve.

Abstract: In a die for compressing and sizing a sintered body at straight portions, upper taper portions are provided on a die upper portion and a core rod upper portion, and the straight portions are provided at a die lower portion and a core rod lower portion. The die upper portion and the core rod upper portion have Young's moduli higher than the die lower portion and the core rod lower portion. The die upper portion and the core rod upper portion are made of materials having Young's moduli that are at least 50 GPa higher than that of the sintered body. The sintered body can be densified with a smaller ironing margin. Since the sintered body is ironed without being compressed, by the upper taper portions and the core rod upper portion having high Young's moduli, the die is prevented from breaking and being abraded due to ironing.

Abstract: This heat-resistant sintered material has, as an overall composition, a composition including, in terms of % by mass, Cr: 15% to 30%, Ni: 8% to 30%, Si: 2.0% to 6.0%, and C: 0.5% to 2.5% with a remainder being Fe and inevitable impurities, wherein the heat-resistant sintered material has a structure in which hard phases are dispersed in a matrix, the matrix includes Fe, Cr, Ni, and Si, the hard phase includes Fe, Cr, and C, and a porosity is 2.0% or less.

Abstract: An oil-retaining sintered bearing in which friction coefficient can be reduced and a sliding property as a bearing can be improved by supplying a sufficient amount of oil to a sliding surface and preventing the supplied oil from moving to an interior from the sliding surface; a sliding surface 3 supporting an outer peripheral surface of a shaft and a helical oiling surface 4 around a shaft axis of a bearing hole are adjacently formed on an inner peripheral surface of the bearing hole into which the shaft is inserted; a surface open rate at the sliding surface 3 is not larger than 10%; and a surface open rate at the oiling surface exceeds 10%.

Abstract: The oil-impregnated sintered bearing of the present invention is an oil-impregnated sintered bearing having a Fe—Cu-based sintered body being impregnated with, a bearing hole being formed in the Fe—Cu-based sintered body and configured to be penetrated by and support a rotating shaft, in which an inner circumferential surface of the bearing hole includes a first region forming a central portion in a shaft direction, a second region from a first end portion of the first region to a first opening of the bearing hole, and a third region from a second end portion of the first region to a second opening of the bearing hole, and an area ratio of the Cu phase of the second region in a center along the shaft direction is 80% or more and 100% or less of an area ratio of the Cu phase of the third region in a center along the shaft direction.

Abstract: An oil-impregnated sintered bearing in which a Fe—Cu-based sintered body is impregnated with a lubricant and which has a bearing hole that is configured to support a rotary shaft inserted therethrough, in which an inner circumferential surface of the bearing hole includes at least a first region including a central portion in a shaft direction and a second region forming a portion from a first end portion of the first region to a first opening of the bearing hole, and, in a friction surface of the second region, an area of a Fe phase is larger and an area of a Cu phase formed of Cu powder including Cu-based flat raw material powder is smaller than those in a friction surface of the first region.

Abstract: A sintered sliding material with excellent corrosion resistance, heat resistance, and wear resistance is provided. The sintered sliding material has a composition made of: 36-86 mass % of Ni; 1-11 mass % of Sn; 0.05-1.0 mass % of P; 1-9 mass % of C; and the Cu balance including inevitable impurities. The sintered sliding material is made of a sintered material of a plurality of grains of alloy of Ni—Cu alloy or Cu—Ni alloy, the Ni—Cu alloy and the Cu—Ni alloy containing Sn, P, C, and Si; has a structure in which pores are dispersedly formed in grain boundaries of the plurality of the grains of alloy; and as inevitable impurities in a matrix constituted from the grains of alloy, a C content is 0.6 mass % or less and a Si content is 0.15 mass % or less.

Abstract: A sintered bearing comprises: a bearing sleeve that is formed of a sintered material and has a shaft hole; an annular ring-shaped seal member that is disposed such that one surface thereof comes into contact with the bearing sleeve; and a washer member that comes into contact with the other surface of the seal member on a side opposite to the one surface and is configured for the seal member to engage with the bearing sleeve. The washer member is fixed to the bearing sleeve.

Abstract: In order to supply sufficient amount of oil to one or more sliding surfaces and to prevent the supplied oil from moving from the sliding surface(s) to an inside so as to achieve lower friction and improve sliding performance of a bearing, in an oil-impregnated sintered bearing 1, sliding surfaces 3 supporting an outer circumferential surface of a shaft 11 and an oil supply surface 4 in which a diameter is larger than that of the sliding surfaces 3 are formed on an inner circumferential surface of a bearing hole 2 into which the shaft 11 is inserted, to be adjacent in an axial direction of the bearing hole 2, a height gap “d1” between the sliding surfaces 3 and the oil supply surface 4 is not less than 0.

Abstract: The molding die of the invention includes: a first die having a through-hole; a second die inserted into the through-hole and capable of moving relative to the first die; and a first punch and a second punch each insertable into the through-hole. A cavity surrounded by the second die, the first punch, and the second punch to compression-mold a molding object is formed in the through-hole. An undercut molding part is formed in the surface of the second die facing the cavity. The second die is formed so as to be splittable into two or more split bodies.

Abstract: A sintered bearing exhibits a less of a hard iron alloy phase, and has an excellent wear resistance and cost performance under low-revolution and high-load use conditions. The sintered bearing contains Cu: 10 to 55% by mass, Sn: 0.5 to 7% by mass, Zn: 0 to 4% by mass, P: 0 to 0.6% by mass, C: 0.5 to 4.5% by mass and a remainder composed of Fe and inevitable impurities. An area ratio of a free graphite dispersed in a metal matrix of the bearing is 5 to 35%; an area ratio of a copper phase in the metal matrix of a bearing surface is not less than 30%; a porosity thereof is 16 to 25%; a hardness of an iron alloy phase in the matrix is Hv 65 to 200; and raw material powders employ at least one of a crystalline graphite powder and a flake graphite powder each having an average particle size of 10 to 100 ?m.

Abstract: A sintered bearing exhibits less of a hard iron alloy phase, and has an excellent wear resistance and cost performance under low-revolution and high-load use conditions; and a method for producing such a sintered bearing. The sintered bearing contains Cu: 10 to 55% by mass, Sn: 0.5 to 7% by mass, Zn: 0 to 4% by mass, P: 0 to 0.6% by mass, C: 0.5 to 4.5% by mass and a remainder composed of Fe and inevitable impurities. An area ratio of a free graphite dispersed in a metal matrix of the bearing is 5 to 35%; a porosity thereof is 16 to 25%; a hardness of an iron alloy phase in the matrix is Hv 65 to 200; and raw material powders employ at least one of a crystalline graphite powder and a flake graphite powder each having an average particle size of 10 to 100 ?m.

Abstract: A die having a cavity and a lower punch fitted into the cavity. The cavity is divided and the parts slide along a division plane passing through the cavity parallel to the fitting direction of the die and the lower punch. The divided cavity parts are placed in a state of alignment along the division plane. The divided cavity parts are each filled with raw material powder. The die and the lower punch are then slid along the division plane, whereby the divided cavity parts are combined as the original cavity. The raw material powder in the cavity in a combined state is compressed by an upper punch and the lower punch.

Abstract: A sintered bearing exhibits less of a hard iron alloy phase, and has an excellent wear resistance and cost performance under low-revolution and high-load use conditions; and a method for producing such a sintered bearing. The sintered bearing contains Cu: 10 to 55% by mass, Sn: 0.5 to 7% by mass, Zn: 0 to 4% by mass, P: 0 to 0.6% by mass, C: 0.5 to 4.5% by mass and a remainder composed of Fe and inevitable impurities. An area ratio of a free graphite dispersed in a metal matrix of the bearing is 5 to 35%; a porosity thereof is 16 to 25%; a hardness of an iron alloy phase in the matrix is Hv 65 to 200; and raw material powders employ at least one of a crystalline graphite powder and a flake graphite powder each having an average particle size of 10 to 100 ?m.