Patent ID: 9197113
Filing Date: 2015-11-24
Classification: H02K

Abstract:
1. A linear actuator comprising an outer tube and an inner tube inserted in the outer tube, the linear actuator generating a thrust for relatively displacing the outer tube and the inner tube along an axial direction, the linear actuator further comprising: a rod erected at a central axis part of the inner tube and forming an annular space between the rod and the inner tube; a rod guide that slides along an inner surface of the outer tube to guide the rod along the axial direction; a plurality of permanent magnets arranged in the rod along the axial direction; and a plurality of coils retained by the outer tube so as to face the permanent magnets, wherein a cooling fluid is filled in an internal space formed between the outer tube and the inner tube, and the inner tube along which the outer tube slides and an inner space of the outer tube along which the rod guide slides have a same cross-sectional area.