Abstract: By using a forming die having a fixed die and a movable die moving along a parting surface on the fixed die and by moving the movable die along the parting surface, to press and hold a sintered part between the movable die and the fixed die, to form a cavity around the sintered part except parts which abut on the fixed die and the movable die by the forming die, and to fill the cavity with melted material which becomes an exterior part, so that the sintered part and the exterior part are integrated by insert molding.

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: By using a forming die having a fixed die and a movable die moving along a parting surface on the fixed die and by moving the movable die along the parting surface, to press and hold a sintered part between the movable die and the fixed die, to form a cavity around the sintered part except parts which abut on the fixed die and the movable die by the forming die, and to fill the cavity with melted material which becomes an exterior part, so that the sintered part and the exterior part are integrated by insert molding.

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: 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: Provided is a bearing for a motor-type fuel injection pump. This bearing is composed of a Cu—Ni-based sintered alloy, inexpensive and has a superior corrosion resistance and abrasion resistance. The bearing contains 10 to 20% by mass of Ni, 2 to 4.5% by mass of Sn, 0.05 to 0.4% by mass of P, 2 to 7% by mass of C, and a remainder consisting of Cu and inevitable impurities. The bearing has a metal structure where Sn is uniformly dispersed and distributed in a metal matrix, and has a porosity of 7 to 17% where a free graphite is dispersed and distributed in pores.

Abstract: A sintered bearing includes a bearing main body which has a substantially cylindrical shape and is made of a sintered material, a through-hole being formed in a center of the bearing main body; a sealing member in a disk shape, the sealing member being configured to be disposed such that one surface side of the sealing member is in contact with the bearing main body, and an opening being formed in a center of the sealing member; and a locking member in a block shape, the locking member being configured to be in contact with at least another surface side of the sealing member and holding the sealing member between the locking member and the bearing main body.

Abstract: On an inner peripheral surface of a bearing hole into which a shaft is inserted, concave oil supply surfaces arranged dispersively like separated islands and a sliding surface continuous around the oil supply surfaces to hold an outer peripheral surface of the shaft are formed: a maximum height difference between the sliding surface and the oil supply surfaces is not less than 0.01% and not more than 0.5% of an inner diameter Di of the sliding surface; a surface aperture area ratio of pores at the sliding surface is not more than 10%; a surface aperture area ratio of pores at the oil supply surfaces is more than 10% and less than 40%; and an area of each of the oil supply surfaces is not less than 0.03 mm2 and not more than 0.2×Di2 (mm2).

Abstract: A sintered component forming step is for forming a sintered component by powder molding. An insert forming step is for forming a sintered insert component in which an exterior component is integrated on an outer peripheral portion of the sintered component. One or more grooves or ridges are formed on an outer peripheral portion of a region except for one end portion of the sintered component in the sintered component forming step. The insert forming step includes a step for bringing the outer peripheral portion of the end portion into contact with an inner peripheral surface of an insert forming mold along a circumferential direction and covering the one or more grooves or ridges by the insert forming mold with an interval to form a cavity on an outer peripheral portion of the sintered component and a step for filling a melted material in the cavity.

Abstract: An oil-impregnated sintered bearing comprises a bearing hole. In the bearing, sliding surfaces supporting an outer circumferential surface of a shaft and an oil supply surface whose diameter is larger than that of the sliding surfaces are formed on an inner circumferential surface of the bearing hole into which the shaft is inserted. The sliding surfaces and the oil supply surfaces are adjacent to each other in the axial direction of the bearing hole. A height gap “d1” between the sliding surfaces and the oil supply surface is not less than 0.01% and not more than 15% of an inner diameter of the sliding surfaces. A surface opening percentage of the sliding surfaces is not higher than 10%. A surface opening percentage of the oil supply surface is higher than 10%. An average circle-equivalent diameter of opening parts of pores on the sliding surfaces is not larger than 20 ?m.

Abstract: A sintered bearing includes a bearing main body which has a substantially cylindrical shape and is made of a sintered material, a through-hole being formed in a center of the bearing main body; a sealing member in a disk shape, the sealing member being configured to be disposed such that one surface side of the sealing member is in contact with the bearing main body, and an opening being formed in a center of the sealing member; and a locking member in a block shape, the locking member being configured to be in contact with at least another surface side of the sealing member and holding the sealing member between the locking member and the bearing main body.

Abstract: Provided is a bearing for a motor-type fuel injection pump. This bearing is composed of a Cu—Ni-based sintered alloy, inexpensive and has a superior corrosion resistance and abrasion resistance. The bearing contains 10 to 20% by mass of Ni, 2 to 4.5% by mass of Sn, 0.05 to 0.4% by mass of P, 2 to 7% by mass of C, and a remainder consisting of Cu and inevitable impurities. The bearing has a metal structure where Sn is uniformly dispersed and distributed in a metal matrix, and has a porosity of 7 to 17% where a free graphite is dispersed and distributed in pores.

Abstract: A molding die includes a first die having a through-hole; a second die inserted into the through-hole and configured to be movable relative to the first die; and first and second punches configured to be insertable into the through-hole, wherein an undercut molding part is provided on the second die, and a molding target is compression-molded in a cavity surrounded by inner side walls of the through-hole, the second die, the first punch, and the second punch.

Abstract: On an inner peripheral surface of a bearing hole into which a shaft is inserted, concave oil supply surfaces arranged dispersively like separated islands and a sliding surface continuous around the oil supply surfaces to hold an outer peripheral surface of the shaft are formed: a maximum height difference between the sliding surface and the oil supply surfaces is not less than 0.01% and not more than 0.5% of an inner diameter Di of the sliding surface; a surface aperture area ratio of pores at the sliding surface is not more than 10%; a surface aperture area ratio of pores at the oil supply surfaces is more than 10% and less than 40%; and an area of each of the oil supply surfaces is not less than 0.03 mm2 and not more than 0.2×Di2 (mm2).

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: 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: 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: 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.