| 摘要 |
A linear actuator realizing low generation of dust and low generation of noise and bearing a large axial load is provided. A plurality of spacers 30, ---, each having at its both ends spherical recessed portions corresponding to curved surfaces of balls 28, ---, are arranged between the balls 28, --- of the guide portion of the linear actuator, and the spacers 30, --- are connected to each other in series by belt-shaped members 31 having flexibility. On the other hand, a plurality of spacers 35, ---, each having at its both ends spherical recessed portions corresponding to curved surfaces of balls 33, --- for the screw shaft of a screw portion, are arranged between the balls 33, --- in a manner separated from each other. By selecting a retainer 27 and the spacer 35 in accordance with the shapes of the guide portion and the screw portion, unnecessary contacting of the mutual balls and unnecessary contacting of the balls to the surrounding circulation passage can be prevented, thus realizing low generation of dust and low generation of noise. <IMAGE> |
