Rotation elastic driver for robot joint

The invention discloses a rotation elastic driver for a robot joint. The rotation elastic driver for the robot joint comprises a first joint arm, a second joint arm, an angling cylinder and a vortex spring. A cylinder body of the angling cylinder is connected with the first joint arm. A transmission shaft of the angling cylinder is connected with the vortex spring. The vortex spring is connected with the second joint arm. In this way, rotation driving of the robot joint by the rotation elastic driver is achieved. The rotation elastic driver for the robot joint integrates a driving element and an elastic element and is small in size, reliable in performance, and low in power consumption, and has the bionic feature. The rotation elastic driver is applied to the lower-limb joint of a humanoid robot, in the process of driving of movement of the humanoid robot, energy is stored and amplified by the rotation elastic driver, so that the bionic driving technology and the energy amplification feature of the rotation elastic diver have high research value, and the rotation elastic driver for the robot joint is wide in application prospect.