Abstract: [Object] To provide a nitrided plate part that exhibits fatigue strength equivalent to or better than that of a carburized member, and a method for producing the same. [Solution] Provided is a nitrided plate part having predetermined components and structure. Nitrogen average content in a range in which a distance from a sheared end face of the part toward an interior of the nitrided plate part in a sheared end face normal direction is equal to or greater than 0.05 mm and equal to or less than 0.10 mm is equal to or greater than 0.4000% and equal to or less than 1.2000% in mass %, and minimum nitrogen content in a range in which the distance is equal to or greater than 0.015 mm and equal to or less than 0.200 mm is 0.0600% or more. After uncoiling a steel sheet coil, stretch and compressive deformation in a range of equal to or greater than 0.03% and equal to or less than 3.00% in amount of plastic strain are alternately applied to a surface layer of a steel sheet.

Abstract: [Object] To provide a nitrided plate part that exhibits fatigue strength equivalent to or better than that of a carburized member, and a method for producing the same. [Solution] Provided is a nitrided plate part having predetermined components and structure. Nitrogen average content in a range in which a distance from a sheared end face of the part toward an interior of the nitrided plate part in a sheared end face normal direction is equal to or greater than 0.05 mm and equal to or less than 0.10 mm is equal to or greater than 0.4000% and equal to or less than 1.2000% in mass %, and minimum nitrogen content in a range in which the distance is equal to or greater than 0.015 mm and equal to or less than 0.200 mm is 0.0600% or more. After uncoiling a steel sheet coil, stretch and compressive deformation in a range of equal to or greater than 0.03% and equal to or less than 3.00% in amount of plastic strain are alternately applied to a surface layer of a steel sheet.

Abstract: A lockup apparatus for a torque converter, which has a drive plate, a driven plate and damper springs connecting the drive plate and the driven plate in a rotating direction, is provided. Each damper spring has a pair of divided parts. An equalizer plate as an intermediate member is arranged so as to slide rotatably on bearing parts of the drive plate, and supporting parts fixed to the equalizer plate are arranged between the divided parts of the damper springs. A bearing part of the drive plate has an outer peripheral surface having an arc shape with a center or a curvature which is offset from a center of an arc shape of an inner peripheral surface of the equalizer plate.

Abstract: The present invention relates to a lockup apparatus for a torque converter and aims to obtain a smooth relative movement of a equalizer plate with respect to a deformation of a drive plate. The drive plate 26 as an inlet sided rotating member is connected to a driven plate 22 as an outlet sided rotating member by means of damper springs 28 in a rotating direction. The damper spring 28 is constructed by a pair of divided parts 28A and 28B. An equalizer plate as an intermediate member 29 is arranged so as to slide rotatably on bearing parts 26-1 of the drive plate 26 and supporting parts 40 fixed to the equalizer plate 29 are arranged between the divided parts 28A and 28B of the damper springs 28. The bearing part 26-1 of the drive plate 26 has an outer peripheral surface 26-1a?, of which arc shape has a center C? of a curvature which is offset from the center C of the arc shape of the inner peripheral surface 29a of the equalizer plate 29.