Flat type torque converter

A flat-type torque converter wherein a toroid is formed of a turbine having a plate-worked turbine blade, a pump having a plate-worked pump blade and a stator having a cast-iron stator blade, and a ratio L.sub.1 /(r.sub.2 --r.sub.1), where L.sub.1 is the axial length of the formed toroid;

• r.sub.1 is the internal radius of the toroid;
• and, r.sub.2 is the external radius of the toroid;
• the ratio of L.sub.1 to (r.sub.2 --r.sub.1), is between 0.67 and 0.87, the ratio r.sub.1 /r.sub.2 is between 0.39 and 0.46 and the axial thickness of the converter is smaller than the radial thickness r.sub.2 --r.sub.1 characterized by a stator having a core ring, a shell ring and circumferentially spaced blades mounted between said core and shell rings axially thereof, each of said blades having a core-side and a shell-side, said core-side and said shell side of each of said blade being twisted relative to said core ring and said ring shell and relative to each other, all in the same direction, each of said blades having a flat-shaped flow-in side top edge between said rings and a curved-shaped flow-out side edge between said rings, said twist of said core-side of said blades at said core ring, relative to the axis of said core ring, being larger than said twist of said shell side at said shell ring and forming a stator blade length relative to said core ring at said core side of said blade larger than the stator blade length relative to said shell ring at said shell side of said blade.