Abstract: A fluid dynamic pressure bearing composed of a cylindrical sintered compact includes: a thrust region which is formed on an end surface of the bearing and receives at least a thrust load; a roughed portion having small peaks and valleys formed on the thrust region; and thrust recesses for generating thrust fluid dynamic pressure, which are formed on the thrust region.

Abstract: A fluid dynamic pressure effect can be sufficient without receiving a large effect of viscous friction of lubricating oil with changes in the environmental temperature in which it is used, and smooth starting of the rotating shaft can be ensured by regulating the gap between the rotating shaft and bearing within a suitable range. An outer diameter of the bearing, D, a length in an axial direction of the bearing, L, a gap at a radial side which is between the rotating shaft and the bearing, C, and an inclining height of the bearing end surface to which the flange is faced, ?, satisfy the expression L/D<C/?. It is preferable that the inclining height, ?, be 2 to 6 ?m, the inner diameter of the bearing be 1 to 3 ?m, and the gap at a radial side, C, be 1 to 4 ?m.

Abstract: The present invention relates to a thermoelectric conversion system for receiving heat by radiation from a heat source and an efficiency improving method of the thermoelectric conversion system, the system including at least one thermoelectric conversion module 5 having at least a pair of thermoelectric elements 2, a heat receiving zone 6 placed not to contact a heat source 3 for receiving heat by radiation from the heat source 3 and a radiating zone 7 positioned on an opposite side to the heat receiving zone 6 and cooled by a coolant 4, generating electric power by a temperature difference between the heat receiving zone 6 and the radiating zone 7, a continuous or divided heat receiving surface 18 formed by one or a plurality of surfaces facing the heat source 3 of the heat receiving zone 6, and each of the heat receiving surface 18 is given a different quantity of heat from the heat source 3, the system comprising the heat receiving surface 18 has a plurality of different emissivities according to the quant

Abstract: A fluid dynamic pressure effect can be sufficient without receiving a large effect of viscous friction of lubricating oil with changes in the environmental temperature in which it is used, and smooth starting of the rotating shaft can be ensured by regulating the gap between the rotating shaft and bearing within a suitable range. An outer diameter of the bearing, D, a length in an axial direction of the bearing, L, a gap at a radial side which is between the rotating shaft and the bearing, C, and an inclining height of the bearing end surface to which the flange is faced, ?, satisfy the expression L/D<C/?. It is preferable that the inclining height, ?, be 2 to 6 ?m, the inner diameter of the bearing be 1 to 3 ?m, and the gap at a radial side, C, be 1 to 4 ?m.

Abstract: A process for producing a sintered aluminum alloy in which dispersion of tensile strength is small and elongation property and fatigue strength are improved. In this process comprising the steps of compacting powder mixture containing rapidly solidified Al—Si powder, Al powder and Cu powder or Cu alloy powder into a green compact; sintering the green compact with optional heat treatment, Al powder having a maximum particle size smaller than a specific range, an average particle size within a specific range and specific particle size distribution, is used.

Abstract: A fluid dynamic pressure bearing composed of a cylindrical sintered compact includes: a thrust region which is formed on an end surface of the bearing and receives at least a thrust load; a roughed portion having small peaks and valleys formed on the thrust region; and thrust recesses for generating thrust fluid dynamic pressure, which are formed on the thrust region.

Abstract: A cylindrical fluid dynamic pressure bearing includes: a shaft hole which has an inner peripheral surface and into which a shaft is inserted; plural separation grooves formed at equal intervals on the inner peripheral surface in a circumferential direction, the separation grooves extending in an axial direction and dividing the inner peripheral surface in the circumferential direction; and circular arc surfaces formed on the inner peripheral surface between the separation grooves, the circular arc surfaces being eccentric with respect to a center of an outer diameter of the bearing and being inwardly biased toward one circumferential direction, wherein the number of the separation grooves is 3 to 6, the number of the circular arc surfaces is the same as the number of the separation grooves, and the separation groove has a width corresponding to an angle of 8 to 20 degrees in the circumferential direction of which a center is an axial center of the bearing, and has a maximum depth of 0.05 to 0.15 mm.

Abstract: A thermoelectric conversion module for generating power by using a temperature difference and realizing a large-size module with soundness to improve substantial filling density of a thermoelectric semiconductor, including a sliding member having high heat conductivity intervening at least between a heating plate of a high-temperature heat source side and a heat source side electrode portion of a thermoelectric semiconductor and a coupling plate for coupling the heating plate to the cooling plate, wherein the thermoelectric semiconductors and the electrode portions are integrated by being sandwiched between the cooling plate and the heating plate via the sliding member, and the sliding member in the pressurized state accepts relative sliding between the sliding member and the heat source side electrode portion or the heating plate.

Abstract: A thermoelectric energy conversion unit includes: a thermoelectric conversion module having plural thermoelectric conversion elements disposed away from each other; a heat receiving member; a cooling member, the cooling member and the heat receiving member holding the thermoelectric conversion module; and a non-oxidizing gas charged in a space formed between the heat receiving member and the cooling member.

Abstract: A bearing unit comprises a bearing 60 formed of a sintered metal in which a magnetized magnetic powder is dispersed in its matrix and at least pores exposed on a bearing surface thereof are sealed by impregnation with a resin; a non-magnetic housing 90 accommodating the bearing 60; and a lubricating fluid M made of a magnetic fluid.

Abstract: The present invention provides a production method for a sintered metal-ceramic layered compact, comprising steps of: filling and layering a metal powder and a ceramic powder, or filling and layering a metal powder, a mixed powder of a metal powder and a ceramic powder, and a ceramic powder; forming a green compact of the layered powders by compacting the layered powders; and sintering a layer including the metal of the green compact at a temperature of lower than a melting point of the metal by heating by irradiation of microwaves in a non-oxidizing atmosphere.

Abstract: Disclosed is a process for manufacturing a sintered slide bearing. A sintered porous bearing body is prepared from a powdered metal material and a resin material in a fluidable state is penetrated into the sintered porous bearing body. The resin material in the sintered porous bearing body is hardened, and the sintered porous bearing body after the hardening of the resin material is repressed to reduce a gap produced between the sintered porous bearing body and the hardened resin material by volume reduction caused on the resin material at the hardening.

Abstract: A bearing unit comprises a bearing 60 formed of a sintered metal in which a magnetized magnetic powder is dispersed in its matrix and at least pores exposed on a bearing surface thereof are sealed by impregnation with a resin; a non-magnetic housing 90 accommodating the bearing 60; and a lubricating fluid M made of a magnetic fluid.

Abstract: A process for producing a sintered aluminum alloy in which dispersion of tensile strength is small and elongation property and fatigue strength are improved. In this process comprising the steps of compacting powder mixture containing rapidly solidified Al—Si powder, Al powder and Cu powder or Cu alloy powder into a green compact; sintering the green compact with optional heat treatment, Al powder having a maximum particle size smaller than a specific range, an average particle size within a specific range and specific particle size distribution, is used.

Abstract: Disclosed is a process for manufacturing a sintered slide bearing. A sintered porous bearing body is prepared from a powdered metal material and a resin material in a fluidable state is penetrated into the sintered porous bearing body. The resin material in the sintered porous bearing body is hardened, and the sintered porous bearing body after the hardening of the resin material is repressed to reduce a gap produced between the sintered porous bearing body and the hardened resin material by volume reduction caused on the resin material at the hardening.

Abstract: Disclosed is a thin plate member for forming a semiconductor package, having a recess for receiving a semiconductor chip. The thin plate is composed of sintered metal, e.g. sintered copper or sintered alluminum alloy. A sintered metal body being porous and having a shape which is close to the shape of the thin plate member is prepared, and it is sized into the shape of the thin plate member. The sintered alluminum alloy comprises 0.4 to 0.8% by weight of magnesium, 0.2 to 0.6% by weight of silicon and the balance aluminum and has a structure comprising an aluminum phase being formed of aluminum particles and an alloy phase being composed of magnesium, silicon and aluminum and interposing between the aluminum particles, and the sintered copper has a metallographic structure comprising a phase of copper particles.

Abstract: In a method of manufacturing a sheet member comprising: obtaining a sintered compact by sintering a sheet-like compact having a reduced-thickness portion and an enlarged-thickness portion; and then repressing the sintered compact into a sheet member, a difference in density between the reduced-thickness portion and the enlarged-thickness portion of the sintered compact after repressing is adjusted to be in a range of .+-.1.5%. By doing so, the accuracy of flatness is enhanced and the amount of distortion, which would otherwise remain in the sheet member, is reduced because the sheet member is formed by sintering the sheet-like compact. In addition, the deformation caused by heating is greatly restricted. Accordingly, the prospect of the sheet member of the present invention is bright as a heat dissipating plate.

Abstract: There is disclosed a method for manufacturing an Fe-based sintered alloy which is superb in machinability. This process comprises the steps of coating a paste-like coating agent including a compound of boron to a surface of a compact of Fe-based or Fe, Cu-based sintered alloy powder including carbon or a pre-sintered compact obtained by heating the compact at a diffusion temperature or less of carbon, and sintering a resultant compact or a pre-sintered compact at a diffusion temperature or more of carbon. An Fe-based sintered alloy manufactured through this process and a bearing cap made of such an Fe-based sintered alloy are also disclosed. In the invention, a film including a compound of boron and pyrolytic resin can be used instead of the paste-like coating agent.

Abstract: There is provided a connecting rod including a connecting rod body and a cap having excellent alignment properties, and a method of producing such a connecting rod. A connecting rod body and a cap are produced through the steps of molding green compacts respectively corresponding to the connecting rod body and the cap; sintering and unifying both the green compacts; forging the resultant sintered product in a mold; and fracturing the resultant forged product. The green compact corresponding to the cap and/or the green compact corresponding to the connecting rod body includes opposite circumferential end faces formed with one or more projection. A clearance c is formed between both circumferential end faces of the sintered product due to the projection. With this clearance c, both the circumferential end faces are formed with recesses and projections which are fitted to each other during the forging process and which are relatively large and thus have large biting amounts.

Abstract: A plurality of blanks divided at a division end face 5 or a blank-bonded product comprising a plurality of blanks sintered and bonded together are or is compressed in the same mold, so that they are plastically deformed until the division end faces 5 are cohered. Thereafter, a load is applied to the plastically worked product in a direction of breaking of the division end faces 5 to break the division end faces 5 and divide the plastically worked product into a plurality of members. In this manner, a split type mechanical part having irregularities meshed with each other on mating faces and easily positionable relative to each other can be produced with a good dimentional accuracy.