利用已有液力变矩器机型，在不改变原基本结构参数的前提下通过增加一组行星传动机构可以设计出具有较大能容量的液力-机械外分流变矩器。探讨了液力-机械外分流变矩器中行星传动机构参数选择的有关问题。研究表明，在组合变矩器结构设计中，为充分提高它的能容量、传动效率和穿透系数，应尽可能选取较小的齿数比。 Utilizing the existing torque converter model, the hydraulic-mechanical external shunt torque converter with larger capacity can be designed by adding a set of planetary transmission mechanism without changing the original basic structural parameters. The problems on the selection of planetary transmission mechanism parameters in hydraulic-mechanical external shunt torque converter are discussed. The research shows that in the design of combined torque converter structure, in order to fully improve its energy capacity, transmission efficiency and penetration coefficient, a smaller gear ratio should be chosen as much as possible.