|Table of Contents|

Thermal characteristics of assembly of high power torqueconverter in traction condition(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年03期
Page:
116-126
Research Field:
汽车与机械工程
Publishing date:

Info

Title:
Thermal characteristics of assembly of high power torqueconverter in traction condition
Author(s):
ZHANG Zeyu1;  BU Zhengfeng2;  HUI Jizhuang1;  ZHANG Fuqiang1;  GU Lichen1; 3
（1. National Engineering Laboratory for Highway Maintenance Equipment, Changan University, Xian 710064,Shaanxi, China; 2. Shaanxi Aerospace Power CO., LTD, Xian 710077, Shaanxi, China; 3. School of〖JP2〗Mechanical Electronic Engineering, Xian University of Architecture and Technology, Xian 710055, Shaanxi, China)
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DOI:
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Abstract:
In the roundtrip conditions, the oil temperature of the torque converter often exceeds the bulldozers working range, in order to study the variation principle of the oil temperature inside hydraulic torque converters, adjust and protect its hydraulic system, the study on thermal characteristics of the assembly of high power torque converter in traction condition was proposed. Based on the theory of thermal equilibrium, the relationship among energy loss, transmission efficiency, generation and dissipation of heat, and oil temperature was analyzed and deduced. The bench was used to test the characteristic parameters of torque, speed, flow rate and oil temperature of YJ380 highpower torque converter for bulldozers under traction condition. According to the experimental data, the mathematical models of 140 kW diesel engine and the torque converter were established, and the cooperating model was analyzed. Based on the power matching between the engine and the torque converter, the oil temperature at the different speed ratio was obtained by calculating the energy loss of the torque converter and the dissipation efficiency of the radiator. Aiming at the phenomenon that the excess oil temperature in the hydraulic, due to the insufficient displacement of the hydraulic system, an oil supply system model was set up. The thermal balance characteristic of the torque converter assembly was optimized by adjusting the flow rate of the hydraulic system, and the temperature of the system was protected by controlling the lockup clutch.Based on the comparison of the experimental data and the calculated results, the deviation was about 2%, which verified the correctness of the mathematical model. Based on the oil supply system of the torqueconverter, a thermostatic control and temperature automatic protection scheme was established. When the oil temperature was in the range of 60 ℃~80 ℃, or 100 ℃~120 ℃， the flow rate could be kept constant by adjusting the flow of the system. When the oil temperature was less than 120 ℃ or higher than 120 ℃, the hydraulic torque converter could be lockup to ensuring the reliability of the assembly. 1 tab, 19 figs, 27 refs.

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Last Update: 2018-06-13