Abstract: In a damper device, a dynamic damper is coupled to a first intermediate member, first and second inner-side springs that act in series with each other are straight coil springs disposed between a second intermediate member and a driven member so that outward movement of the springs in a radial direction of the damper device is restricted at respective both ends, and a gap is formed between each body portion of the first and the second inner-side springs and the second intermediate member or a spring abutment portion of the driven member.

Abstract: A method of manufacturing a case for a starting device, the case having at least one curved portion and having an interior configured to be supplied with oil includes forming a thickened portion by partially thickening a metal sheet material and forming the curved portion by bending the sheet material at the thickened portion by press working. An outer surface of the curved portion projects outward of the case beyond a curved surface that is concentric with an inner surface of the curved portion and that has a radius of curvature equal to the sum of the radius of curvature of the inner surface and the thickness of the sheet material forming the case. Metal flows in the curved portion are continuous from the inner surface to the outer surface without any break.

Abstract: A center piece is coupled to a flange member to thereby form a second oil path between an intermediate wall portion of the center piece and the flange portion. A male screw portion is formed on an outer peripheral surface of a cylindrical portion of the center piece, and a nut member in which a female screw portion is formed on an inner peripheral surface is screwed to the male screw portion. Accordingly, the flange member is pressed onto the intermediate wall portion to thereby couple the center piece to the flange member. As a result, the center piece can be coupled to the flange member without causing backlash.

Abstract: A center piece is coupled to a flange member to thereby form a second oil path between an intermediate wall portion of the center piece and the flange portion. A male screw portion is formed on an outer peripheral surface of a cylindrical portion of the center piece, and a nut member in which a female screw portion is formed on an inner peripheral surface is screwed to the male screw portion. Accordingly, the flange member is pressed onto the intermediate wall portion to thereby couple the center piece to the flange member. As a result, the center piece can be coupled to the flange member without causing backlash.

Abstract: In a damper device, a dynamic damper is coupled to a first intermediate member, first and second inner-side springs that act in series with each other are straight coil springs disposed between a second intermediate member and a driven member so that outward movement of the springs in a radial direction of the damper device is restricted at respective both ends, and a gap is formed between each body portion of the first and the second inner-side springs and the second intermediate member or a spring abutment portion of the driven member.