| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric linear actuator having improved product quality by suppressing vibration and noises even when vibration load or alternating load is applied to a ball screw. SOLUTION: The electric linear actuator 1 comprises the ball screw 3 consisting of a screw shaft 7 coaxially connected to an electric motor 5 and having a screw groove 7a formed in the outer periphery, a nut 8 having a supporting shaft 12 on the outer periphery for supporting a link 2 at one end and having a screw groove 8a formed in the inner periphery, and a ball 9 stored between both screw grooves, for converting the rotating motion of the electric motor 5 into the axial motion to give rocking motion to the link 2 via the supporting shaft 12, and a pair of supporting bearings 10, 11 for rotatably bearing the screw shaft 7 in an axially non-movable manner. The supporting bearing 10 on the side of the electric motor 5 is formed as a double row angular contact ball bearing. Light preload is imparted to the ball screw 3 to suppress vibration and noises even when vibration load or alternating load is applied to the ball screw 3. COPYRIGHT: (C)2006,JPO&NCIPI
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