Torque converter

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 torque converter comprising:

• a flanged portion on an outer peripheral portion of the outer hull, to which flanged portion driving power of an engine is to be transmitted;
• a pilot boss portion disposed at an axial portion of the front cover and adapted to be fitted to a crank shaft of the engine;
• and
• a sleeve-like oil pump driving shaft disposed at an axial portion of the impeller shell and adapted to drive an oil pump;
• wherein said pilot boss is integrally formed with the front cover via plastic working, and said flanged portion is formed at a front portion of an outer periphery of the front cover and includes a thickened portion that is formed via plastic working, and
• wherein the front cover and the impeller shell each comprise a deformed 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
• 0.001-0.01 weight percent boron
• remainder weight percent iron.

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 torque converter comprising:

• a ring gear for a starter, with said ring gear being on an outer peripheral portion of the outer hull;
• a pilot boss portion disposed at an axial portion of the front cover and adapted to be fitted to a crank shaft of the engine;
• and
• a sleeve-like oil pump driving shaft disposed at an axial portion of the impeller shell and adapted to drive a n oil pump,
• wherein said pilot boss is integrally formed with the front cover via plastic working, and
• wherein the front cover and the impeller shell each comprise a deformed 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
• 0.001-0.01 weight percent boron
• remainder weight percent iron.