PLOTTING OF EXTERNAL CHARACTERISTIC OF A TORQUE CONVERTER WITH COUNTER-ROTATING MODE OF TURBINE WHEEL IN DOUBLE-FLOW HYDROMECHANICAL TRANSMISSION OF AN INDUSTRIAL TRACTOR

Double-flow hydromechanical transmissions are widely used in industrial tractors and high-speed tracked vehicles. The main advantage of this transmission is a higher value of the maximum efficiency compared to a single-flow hy-dromechanical transmission. Considered is the double-flow hydromechanical transmission of the industrial tractor D8L «Caterpillar» and the results of its bench experimental studies are presented. In this transmission, the torque converter operates in a certain rotational speed range of the driven shaft in the counter-rotating mode of the turbine wheel. In the domestic and foreign literature there are no external characteristics of torque converters with the mode of turbine wheel anti-rotation. It was not possible to obtain such external characteristics of the torque converter experimentally so far. This is due to the complexity of providing a test-bench with anti-rotation mode of the turbine wheel of the torque converter. This mode is realized only in a double-flow hydromechanical transmission. However, with its experimental test-bench studies, existing techniques did not allow plotting of an external characteristic of the for the turbine wheel counter-rotating mode. At experimental test-bench researches of a torque converter only it is also impossible to provide the mode of counter rotation of a turbine wheel. In this paper, a method is given for plotting of external characteristic of a torque converter with turbine wheel anti-rotation mode, if an external characteristic of a double-flow hydromechanical transmission is known. The validity and reliability of the proposed approach to the plotting of the external characteristic of the torque converter with turbine wheel counter rotation mode is confirmed by the results of bench experimental studies of the double-flow hydromechanical transmission and the torque converter of the industrial tractor D8L Caterpillar.

double-flow hydromechanical transmission, torque converter, external characteristic of double-flow hydromechanical transmission and torque converter, counter-rotating mode of torque converter turbine wheel