| 摘要 |
The present invention relates to a step actuator having a structure in which a lead screw is coupled with a screw thread formed in a nut member that is installed inside a rotor magnet, wherein the lead screw moves forwards or backwards in an axial direction according to the rotation of the rotor, and wherein power is transmitted in the axial direction. More specifically, a cylindrical bearing that allows the nut member to rotate is located in the upper part of the nut member and is formed as part of the nut member. Therefore, gaps in the axial direction in the coupled area between the cylindrical bearing and the nut member can be fundamentally prevented. The translation error of the step actuator can be significantly reduced since the rotor moves in the axial direction when the lead screw moves forwards or backwards in the axial direction. In addition, the number of parts to be assembled is decreased, resulting in a reduction in the material cost and the labour cost for assembly. |
