| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an electric linear actuator for avoiding the operation lock of a ball screw by preventing the rotation of a screw shaft, while improving its strength and durability against an excessive load when the load is applied thereto.SOLUTION: An electric linear actuator 1 includes a ball screw mechanism 8 for converting rotating motion into linear motion in the axial direction of a driving shaft 7 via a speed reduction mechanism 6. Herein, a cup-shaped sleeve 17 is fitted through a bag hole 12 of a housing 2b, a recessed groove 17a extending in the axial direction is formed in the inner periphery of the sleeve 17, a locking pin 15 implanted in the end of a screw shaft 10 engages therewith to prevent the rotation of the screw shaft 10, and a tolerance ring 31 is mounted between the sleeve 17 and the bag hole 12 of the housing 2b via an interference. The tolerance ring 31 is formed with a plurality of waveform parts equally spaced from one another along the peripheral direction and being protruded in the radial direction, and the waveform parts each consist of annular portions and a protruded portion formed between the annular portions.</p> |
