Abstract
The study considers a concept of hydraulic power transmission with a multi-stage hydraulic torque converter. The design objective is expanding the operational envelope of a self-propelled vehicle, increasing the power train efficiency in the entire engine torque transformation range. Two hydraulic torque converter (HTC) designs are proposed. The HTC uses uncoupled turbines (centrifugal, axial, centripetal) in a series arrangement. Each turbine operates in its optimal range of the HTC ratios. Each turbine is connected to the output shaft with individually controlled couplings. To optimize the hydraulic torque converter performance, a dedicated stator for each turbine is proposed. It is activated/deactivated concurrently with the respective turbine. The proposed hydraulic power transmission is designed for heavy self-propelled vehicles operated in mining and construction. The design can also be used in railway engine power trains to replace the complicated multistage hydraulic transmissions consisting of two or three conventional hydraulic torque converters. The hydraulic power transmission kinematics and principle of operation are protected by the Russian patent No. 2716378. The study is supported by Tula State University as research project No. 2019-22.
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