Abstract
Keywords: torque converter, hydraulic converter, torque characteristics
Design of hydraulic torque convertors has to fulfill following requirements: power, rotational speed of input (pump) and output (turbine) shafts at the rated regime. Besides these data there are often some put additional demands like starting characteristics, realization of the ordered torque´s conversions in the zone of normal operation, etc. The set of data describing torque´s nad efficiency for constant input and variable output rotational speeds is known as external characteristics of torque converters. The set of data describing fow rate and specific energy in pump and turbine(s) forms represent internal characteristics. Different methods for computation of external and internal characteristics of the converter are based on energy and given in the reference literature. The most common ones are based on the assumption that velocity deflection at the cascade outlet is independent of the fluid inlet angle. In this paper, an original method based of the usage of experimental converters torque curves and centrifugal pumps energy characteristics are described. If experimental data are unavailable, data for typical construction may be used. The above method gives a basis for the computation of fluid flow in torque converters in the whole normal operating zone, thus making possible modification of shapes of impeller and runner blades and guide vans and, consequently, the correction of external characteristics, which are very important for the determination of the whole transmission system.