Abstract: A retainer structure having excellent workability of attaching to and removing from a panel is obtained. In an approximately cylindrical retainer main body (22), a cap holding portion (26) for attaching a cap (18) which is an attached member, and a panel clamping piece (32) contacting a body panel (14) from a side opposite to a seal packing (20) so as to clamp the body panel (14) between the panel clamping piece and a flange portion (24), are formed. The cap holding portion (26) and the panel clamping piece (32) are formed at positions different in a circumferential direction of the retainer main body (22).

Abstract: The invention provides a flake graphite cast iron being highly strong and excellent in workability such as cutting performance, which is suitable for use, for example, in internal combustion engine parts and the like, and a production method thereof without using a misch metal. Specifically, the flake graphite cast iron according to the invention includes an A-type graphite with a uniformly and disorderly distributed existence form without directionality; and has a chemical composition containing 2.8 to 4.0 mass % of C, 1.2 to 3.0 mass % of Si, 1.1 to 3.0 mass % of Mn, 0.01 to 0.6 mass % of P, 0.01 to 0.30 mass % of S and the remainder being Fe and inevitable impurities, wherein the ratio (Mn/S) of the Mn content to the S content is within a range of 3 to 300.

Abstract: A retainer structure having excellent workability of attaching to and removing from a panel is obtained. In an approximately cylindrical retainer main body (22), a cap holding portion (26) for attaching a cap (18) which is an attached member, and a panel clamping piece (32) contacting a body panel (14) from a side opposite to a seal packing (20) so as to clamp the body panel (14) between the panel clamping piece and a flange portion (24), are formed. The cap holding portion (26) and the panel clamping piece (32) are formed at positions different in a circumferential direction of the retainer main body (22).

Abstract: The intraoral camera of the present invention comprises a main body case (1), an intraoral insertion component (3) mounted on the front side of the main body case (1), an imaging window (3a) provided to the intraoral insertion component (3), and an imaging device (10) that is optically linked to the imaging window (3a) and is disposed inside the main body case (1) or inside the intraoral insertion component (3). Illumination elements (9) are disposed at portions of an outer peripheral wall face (17) that are substantially opposite each other in the horizontal direction. These illumination elements (9) are inclined toward the outside of the imaging window in the center of the imaging window (3a), and the outer peripheral wall face (17) that is substantially opposite these illumination elements (9) in the vertical direction is constituted as a light collecting face that is inclined toward the outside of the imaging window in the center of the imaging window (3a).

Abstract: A steel product having a composition which contains by mass C: 0.01 to 1.9%, Si: 0.01 to 1.9%, Mn: 5.0 to 24.0% with balance consisting of Fe and unavoidable impurities and a steel product described above which further contains Cr: 18.0% or below and/or Ni: 12.0% or below in addition to the above essential elements. The above steel products may each further contain Al: 1% or below and/or N: 0.3% or below and the above steel products may each further contain one or more elements selected from among Nb, Ti, Zr, Mo and Cu in a total amount of 4.0% or below. The steel products can sufficiently follow the thermal expansion of a cylinder made of an aluminum alloy and thus enables the production of a piston ring which is suitable for use as a piston ring to slide on the inner face of a cylinder bore made of an aluminum alloy in an internal combustion engine and which can retain excellent sealing properties.

Abstract: The invention provides a flake graphite cast iron being highly strong and excellent in workability such as cutting performance, which is suitable for use, for example, in internal combustion engine parts and the like, and a production method thereof without using a misch metal. Specifically, the flake graphite cast iron according to the invention includes an A-type graphite with a uniformly and disorderly distributed existence form without directionality; and has a chemical composition containing 2.8 to 4.0 mass % of C, 1.2 to 3.0 mass % of Si, 1.1 to 3.0 mass % of Mn, 0.01 to 0.6 mass % of P, 0.01 to 0.30 mass % of S and the remainder being Fe and inevitable impurities, wherein the ratio (Mn/S) of the Mn content to the S content is within a range of 3 to 300.

Abstract: A cylinder liner for use in an internal combustion engine has an inner peripheral surface at which a surface treatment layer is formed upon water vapor treatment. The surface treatment layer has a surface configuration capable of providing excellent lubrication oil retaining function and initial break-in property as well as capable of being machined easily. The treatment surface of the cylinder liner has a plateau configuration providing a surface roughness Rz of 0.8 to 5.9 ?m, and the plateau configuration is defined under DIN4776 by a reduced peak height Rpk of not more than 0.64 ?m, a core roughness depth Rk of 0.05 to 1.8 ?m, and a reduced valley depth Rvk of 0.15 to 3.3 ?m. For grinding to the surface, a honing machine employs a grindstone containing metal bonded diamond grains at high density. Diamond grain size is not less than 4000.

Abstract: A cylinder liner for use in an internal combustion engine has an inner peripheral surface at which a surface treatment layer is formed upon water vapor treatment. The surface treatment layer has a surface configuration capable of providing excellent lubrication oil retaining function and initial break-in property as well as capable of being machined easily. The treatment surface of the cylinder liner has a plateau configuration providing a surface roughness Rz of 0.8 to 5.9 &mgr;m, and the plateau configuration is defined under DIN4776 by a reduced peak height Rpk of not more than 0.64 &mgr;m, a core roughness depth Rk of 0.05 to 1.8 &mgr;m, and a reduced valley depth Rvk of 0.15 to 3.3 &mgr;m. For grinding to the surface, a honing machine employs a grindstone containing metal bonded diamond grains at high density. Diamond grain size is not less than 4000.

Abstract: A cylinder liner and a piston ring adapted to be combined therewith in an internal combustion engine are provided that have excellent abrasion resistance, where iron oxide film is formed at least on a part of the inner circumferential surface of the cylinder liner, and metallic nitride film is formed at least on a sliding surface of the piston ring sliding along the cylinder liner.