Active-passive type ankle joint prosthesis and movement mode thereof

The invention discloses an active-passive type two-degrees-of freedom ankle joint prosthesis, comprising a carbon fiber energy storage sole, a motor, a speed reducer, a motor fixing supporting seat, a belt pulley transmission device, a carbon fiber pipe, a ball screw, an energy storage springs, joint bearings, energy storage rubber rings and joint supporting seats, wherein the carbon fiber energy storage sole is connected with the carbon fiber pipe through the joint supporting seats; the motor fixing supporting seat is connected with the carbon fiber pipe through an active pin; the motor is fixedly arranged on one end of the motor fixing supporting seat; the ball screw is fixedly arranged on the other end of the motor fixing supporting seat; two ends of the motor fixing supporting seat are connected by the belt pulley transmission device; the energy storage springs areis connected with a ball screw nut; and the energy storage rubber rings are connected with the joint bearings and the joint supporting seats through a shaft. The ankle joint prosthesis provided by the invention not only can completely provide required energy for human gait, but also can adapt to various landforms; in addition, the ankle joint prosthesis can completely imitate movement angles of a human ankle joint on a sagittal plane or a coronal plane; and therefore, the normal walking requirement of an amputation patient can be satisfied better.