Abstract:

A new design method based on the flat elliptic torus was proposed to design the flat hydrodynamic torque converter for the passenger car with more reasonable blade form and better performance. A new flatness ratio was defined as the ratio of minor axis to major axis of the ellipse, so its change can reflect the change of whole torus. Based on the analysis of the momenturn distribution on the performance of torque converter, the traditional blade design method on the basis of uniform momentum distribution was inproved, a quachratic function distribution of momentum was used to design the blade for the different vane wheels, and the flat torque converter blade with better form was achieved. The performances of the flat torque converters designed by both the new and the traditional torus design methods were predicted, resulting in that the former is better than latter under the same flatness ratio.

Key words: turn and control of fluid;hydrodynamic torque converter, flatness ratio, torus, momentum distribution