Superflat automobile hydraulic torque converter

The invention relates to a superflat automobile hydraulic torque converter. The superflat automobile hydraulic torque converter is characterized in that the diameter of a circulating circle of the hydraulic torque converter is (236+/-2) mm; a turbine outer ring is composed of six circular arc sections with different radiuses; and a pump impeller outer ring is composed of four circular arc sections with different radiuses. According to the superflat automobile hydraulic torque converter, unique cascade parameters are adopted, the circulating circle flatness ratio of the superflat automobile hydraulic torque converter reaches 0.178, the axial dimension is reduced by 5 to 15 mm compared with the axial dimension of a hydraulic torque converter adopting an ordinary circulating circle, the flow area is shrunk by around 15%, and the efficiency is improved by 3% or above; the technical problems about how to reduce the positive penetrativity and improve the high-speed ratio working condition efficiency are solved; and the torque is 150 NM to 300 NM, the radial dimension is within 260 mm, and the superflat automobile hydraulic torque converter is applicable to engines with the displacement of 1.6 L to 2.4 L.