A hydrodynamic torque converter for relatively large power outputs which includes a centrifugally transversed pump wheel and a centripetally traversed turbine wheel, both equipped with blades having a single curvature and flat and/or conical wheel side walls, a turbine wheel outlet diameter approximately equal to the inlet diameter of the pump wheel and a guide wheel arranged directly upstream of the pump wheel and a further guide wheel arranged directly downstream of the turbine wheel; the radial length of the turbine blading is larger than 15 percent of the middle diameter of the turbine blading while the blade spacing of the turbine wheel at the middle diameter of the turbine blading amounts to about 30 to 50 percent of the radial length of the turbine blades and the interior width of each blade flow channel at the outlet of the turbine wheel is smaller than 35 percent of the blade spacing.