Abstract: A method is required in which a plate-like flange member may be firmly secured at the front end of a hollow shaft member through a plastic working treatment by virtue of caulking combination, so as to manufacture a hollow shaft having a flange at one end thereof.

Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.

Abstract: A torque converter comprises an impeller shell, a pump impeller integrally formed with the impeller shell, a turbine runner, a stator, a front cover, and at least one of a flanged portion through which a driving power of an engine is transmitted and a ring gear for a starter. The flanged portion is formed on an outer peripheral portion of an outer hull that includes the impeller shell and the front cover. A pilot boss portion is disposed at an axial portion of the front cover and is adapted to be fitted to a crank shaft of the engine, and a sleeve-like oil pump driving shaft is disposed at an axial portion of the impeller shell and is adapted to drive an oil pump. The pilot boss portion is formed integrally with the front cover through a plastic working operation, and the flanged portion formed at a front portion of the outer periphery of the front cover is increased in thickness through a plastic working operation that forms the flanged portion as a lamination.

Abstract: A disc-shaped material is prepared by punching a high carbon steel plate or soft steel plate, and the disc-shaped material is fixed in position. An outer peripheral portion of the disc-shaped material is heated to a temperature of 400.degree.-500.degree. C. by means of a high frequency heater. The outer peripheral portion of the disc-shaped material is swaged to form a thickened portion by a swaging die and the thickened portion is then spun to plastically form a toothed gear to the outer peripheral portion of the disc-shaped material in two steps of coarse working and finish working by spinning dies. The thus formed toothed gear is further heated as occasion demands to a temperature of about 900.degree. C. for quenching.

Abstract: There is provided a method for forming a disc-shaped blank in which a disc-shaped thin plate material is, at an outer peripheral portion thereof, swaged towards an axial side of the plate material with a roll die to thicken the outer peripheral portion and is shaped into a cross-sectional configuration corresponding to that of a dish, the method comprises the steps of: sandwiching and securing between a pair of sandwiching members the disc-shaped thin plate material except for the outer peripheral portion including a swaging portion; swaging the swaging portion projecting from the sandwiching members so that an outermost end of the swaging portion may be shaped into a cross-sectional configuration corresponding to that of an arrowhead while a root portion of the swaging portion has the same thickness as the original thin thickness of the plate material; thereafter, bending the outer peripheral portion including the thick-walled swaged portion at the root portion thereof from one side surface of the disc-shape

Abstract: A disc-shaped material is prepared by punching a high carbon steel plate or soft steel plate, and the disc-shaped material is fixed in position. An outer peripheral portion of the disc-shaped material is heated to a temperature of 400.degree.-500.degree. C. y means of a high frequency heater. The outer peripheral portion of the disc-shaped material is swaged to form a thickened portion by a swaging die and the thickened portion is then spun to plastically form a toothed gear to the outer peripheral portion of the disc-shaped material in two steps of coarse working and finish working by spinning dies. The thus formed toothed gear is further heated as occasion demands to a temperature of about 900.degree. C. for quenching.

Abstract: A toothed wheel for use in automobiles and a method for its manufacture are disclosed. The toothed gear is of a dish-shaped disk having a thickened peripheral edge portion in an outer and/or inner side of which gear teeth are shaped, at least the surface area of the gear teeth being of a martensite structure, the disk being made of a steel comprising a ferrite-cementite-graphite structure in which 50% or more of cementite has been changed to graphite, the steel composition of the disk consisting essentially of, by weight %:C: 0.20-0.70%, Si: 0.05-1.00%, Mn: 0.05-0.50%, sol. Al: 0.01-1.00%, N: 0.002-0.010%, B: 0.0003-0.0050%, Ca: 0-0.01%, Cu: 0-1.00%, Ni: 0-2.00%,and a balance of Fe and incidental impurities in which the content of P is restricted to not larger than 0.020% and the content of S is restricted to not larger than 0.010%.

Abstract: A method of manufacturing a driver plate comprises the steps of swaging the outer peripheral portion of a disk-shaped raw material in the radial direction thereof using a swaging die so as to form the outer peripheral portion in a thick wall portion, holding the swaged material between an upper and a lower die and pressing the material through the upper and lower dies so as to form it into a dish-shaped blank, and pressing radially the thick-walled outer peripheral portion of the dish-shaped blank held between a support die disposed either on the outside or on the inside thereof and a gear tooth profile forming die so as to form gear teeth either on the radially outside or on the radially inside of the outer peripheral portion. As an alternative, gear teeth may be formed by cold rolling work or gear teeth cutting work using a gear hobbing machine or one of other gear teeth cutting machines.