Abstract: Provided is a fluid bearing device with a hub part having high molding precision and dimensional stability and capable of being produced at low cost. An annular gate (14) is formed at a portion of a cavity (15) corresponding to an outer peripheral edge portion of a lower end surface (10c1) of a flange part (10c), and a molten resin (P) is filled into the cavity (15) through the annular gate (14) to form a hub part (10) made of resin. The hub part (10) molded by the injection molding exhibits a radial resin orientation through an entire periphery thereof. Further, an annular gate trace (16) is formed at the outer peripheral edge portion of the lower end surface (10c1) of the flange part (10c) of the hub part (10).

Abstract: A sintered metal bearing is obtained by compression-molding of a raw-material powder containing at least a Cu powder, an SUS powder, and a pure Fe powder and thereafter sintering a compression-molded body at a predetermined temperature.

Abstract: With use of separated alloy powder (10) as a sintering material, it is possible to utilize characteristics of metals of different types (SUS steel and Cu, for example). Further, a boundary surface between regions constituted by different metals is at least partially alloyed. Thus, it is possible to enhance bonding strength between the regions, and possible to enhance strength of a sintered bearing.

Abstract: A maximum diameter (d) of each of surface openings formed in a bearing surface through melting of Sn metal powder as a binder is set within a range of 0 ?m<d?25 ?m. In order to attain the range, binder metal powder having a maximum particle diameter of 25 ?m or less is used.

Abstract: Provided is a fluid bearing device with a hub part having high molding precision and dimensional stability and capable of being produced at low cost. An annular gate (14) is formed at a portion of a cavity (15) corresponding to an outer peripheral edge portion of a lower end surface (10c1) of a flange part (10c), and a molten resin (P) is filled into the cavity (15) through the annular gate (14) to form a hub part (10) made of resin. The hub part (10) molded by the injection molding exhibits a radial resin orientation through an entire periphery thereof. Further, an annular gate trace (16) is formed at the outer peripheral edge portion of the lower end surface (10c1) of the flange part (10c) of the hub part (10).

Abstract: Provided are a sintered metal material improved in sliding property and wear resistance with respect to an associated sliding member to be supported, and a sintered oil-impregnated bearing formed of this metal material. A bearing sleeve is formed by compacting a mixed metal powder composed of not less than 5 wt % and not more than 94.3 wt % of Cu powder, not less than 5 wt % and not more than 94.3 wt % of SUS powder, not less than 0.2 wt % and not more than 10 wt % of Sn powder, and not less than 0.5 wt % and not more than wt % of graphite, and then performing sintering on a compact of the mixed metal powder.

Abstract: The present invention aims to achieve a reduction in cost for a fluid dynamic bearing device. The fluid dynamic bearing device supports a shaft member (2) radially in a non-contact fashion by a dynamic pressure action generated in a radial bearing gap between an outer peripheral surface of the shaft member (2) and an inner peripheral surface (7a) of a bearing member (7), and is composed of the shaft member (2), the bearing member (7), a cover member (8), and a seal member (9). The shaft member (2) is inserted into an inner periphery of the bearing member (7), and an opening at a lower end thereof is sealed by the cover member (8). The seal member (9) is attached to an opening at an upper end of the bearing member (7), forming a seal space (S) between itself and the outer peripheral surface of the shaft member (2). Dynamic pressure grooves (G) of radial bearing portions (R1 and R2) are formed in an inner peripheral surface (7a) of the bearing member (7) by molding.

Abstract: An exhaust manifold is provided with a plurality of branch pipe parts and a collecting pipe part. The plurality of branch pipe parts are respectively connected to a plurality of exhaust ports of a multicylinder internal combustion engine. The collecting pipe part is formed by merging the plurality of branch pipe parts. The plurality of branch pipe parts and the collecting pipe part are formed by an upper shell member and a lower shell member superposed on each other. A partition plate is attached to at least one of the upper shell member and the lower shell member. The partition plate separates between exhaust gases flowing into the collecting pipe part from two of the branch pipe parts respectively connected to adjacent two of the plurality of exhaust ports.

Abstract: An exhaust manifold is provided with a plurality of branch pipe parts and a collecting pipe part. The plurality of branch pipe parts are respectively connected to a plurality of exhaust ports of a multicylinder internal combustion engine, The collecting pipe part is formed by merging the plurality of branch pipe parts. The plurality of branch pipe parts and the collecting pipe part are formed by an upper shell member and a lower shell member superposed on each other. A partition plate is attached to at least one of the upper shell member and the lower shell member, The partition plate separates between exhaust gases flowing into the collecting pipe part from two of the branch pipe parts respectively connected to adjacent two of the plurality of exhaust ports.

Abstract: A rolling or sliding machine part that has an improved oil film formation capacity. The machine part has a rolling or sliding contact surface formed with discontinuous grooves, which are dispersedly arranged and extend across the direction in which the machine part rolls or slides.