| 摘要 |
A stepless speed reducer includes the mechanical power transmission lines for high speed (15) and low speed (14), either line being selected to effect power transmission. When the working speed ratio comes near a predetermined critical speed ratio, the operation is maintained at the critical speed ratio while the pump motor (8) for low speed is kept inoperative and no pressure difference exists between the transmission circuits (31a, 31b), thereby transmitting power through the line for high speed (15). |
