Analysis of Main Characteristics of Hydro-mechanical Continuously Variable Transmission

摘要

A kind of hydro-mechanical continuously variable transmission (HMCVT) is put forward on the basis of the power split fundamental principle. The equations of speed, torque, power and efficiency characteristics of HMCVT are established according to the transmission principle in this paper. The analysis results show that HMCVT has the function of steepless transmission by the control of the hydraulic system; the adoption of planets and gear shift mechanisms contributes to expanding the variable speed range of HMCVT; the HMCVT could satisfy the operation requirements of the high-power tractors with the characteristic that the large output torque at the low speed range and high efficiency at most of speed range.