Cylinder fixation type four-bar mechanism intelligent artificial limb knee joint

An intelligent prosthetic limb knee joint with a cylinder stationary type four-bar mechanism belongs to the fields of biological medicine engineering and rehabilitation assistant devices. The intelligent prosthetic limb knee joint with a cylinder stationary type four-bar mechanism includes a above-knee prosthesis part, a knee joint antebrachium, a knee joint postbrachium, a below-knee prosthesis part, a cylinder part, and a linear motor and a needle valve used for providing intelligent driving. The cylinder part is fixed on the below-knee prosthesis part through positioning pins; a pendulum bar is additionally disposed between the upper end of a piston rod and the above-knee prosthesis part, and a torsional spring is assembled on the upper shaft of the pendulum bar. During the knee joint movement, the product of the invention moves following the below-knee prosthesis only and does not swing itself, thus, during the knee joint movement, the influence of large space occupation and greatadditional rotary inertia caused by relative swing of the cylinder body on pace control are avoided. At the same time, the linear motor and the needle valve are assembled at the lower end of the cylinder body, the intermediate parts are reduced, the costs for manufacture and maintenance are lowered and the operation accuracy and operation efficiency are enhanced.