Electric linear actuator

According to the electric linear actuator, the responsiveness of the electric linear actuator can be improved. According to one embodiment of the present invention, an electric linear actuator is provided with: an outer cylinder; the motor is arranged on the outer cylinder; a ball screw that converts the rotational motion output by the motor into linear motion in a predetermined direction; and a ball spline for transmitting only rectilinear motion in a predetermined direction, the ball screw being provided with: a threaded shaft connected to a shaft of the motor; and a first nut attached to the outer cylinder and fitted to the threaded shaft, in which the ball spline is provided with: a spline shaft connected to the first nut; and a second nut attached to the outer cylinder and fitted to the spline shaft. 本发明的电动线性致动器可提升电动线性致动器的响应性。根据本发明的一个实施方式，提供一种电动线性致动器，具备：外筒；电动机，安装于外筒；滚珠丝杠，将电动机输出的旋转运动转换为规定方向的直线运动；以及滚珠花键，仅传递规定方向的直线运动，其中滚珠丝杠具备：螺纹轴，连结于电动机的轴；以及第一螺帽，安装于外筒，与螺纹轴嵌合，其中滚珠花键具备：花键轴，连接于第一螺帽；以及第二螺帽，安装于外筒，与花键轴嵌合。