Patent ID: 6662446
Filing Date: 2003-12-16
Classification: B23P,F16H,Y10T

Abstract:
A method of manufacturing a torque converter having an outer hull that includes an impeller shell and a front cover, a pump impeller integrally formed with the impeller shell, a turbine runner and a stator, said method comprising:providing a flanged portion on an outer peripheral portion of an outer hull that includes an impeller shell and a front cover, to which flanged portion driving power of an engine is to be transmitted; providing a pilot boss portion at an axial portion of said front cover, with said pilot boss portion adapted to be fitted to a crank shaft of the engine; providing a sleeve-like oil pump driving shaft at an axial portion of said impeller shell, with said sleeve-like oil pump adapted to drive an oil pump; and providing a water-tight brazing and a coating layer at an inner peripheral side boundary portion of said flanged portion which is in communication with a screw hole portion that is provided in said flanged portion, wherein the providing of said pilot boss portion comprises integrally forming said pilot boss portion with said front cover by performing a plastic working operation, wherein the providing of said flanged portion comprises integrally forming said flange protein with a front portion of an outer periphery of said front cover by performing a plastic working operation such that said flanged portion includes a thickened portion, and wherein said front cover is formed by deforming a first steel plate, and said impeller shell is formed by deforming a second steel plate, with each of said first steel plate and said second steel plate having the following composition: 0.2-0.6 weight percent carbon 0.01-0.1 weight percent silicon 0.05-0.5 weight percent manganese 0.01-0.1 weight percent titanium 0.00 1-0.01 weight percent boron remainder weight percent iron.