| 摘要 |
PROBLEM TO BE SOLVED: To provide an actuator which facilitates inner packaging work of a lubrication oil holding member in a movable part while reducing the processing costs, prevents deformation and damage of the lubrication oil holding member thereby extending the maintenance period, and supplies a lubrication oil to rolling elements over a long time.SOLUTION: An actuator includes: a housing; a movable part movably attached to the housing; a first rolling passage which is provided between the housing and the movable part; a through hole which is provided in the movable part and provides a second rolling passage; return caps which are attached to both end sides of the movable part when viewed in a travelling direction and respectively include return passages which allow the first rolling passage to communicate with the second rolling passage; multiple rolling elements which are disposed in the first rolling passage, the second rolling passage, and the return passage so as to roll; and a lubrication mechanism composed of a cylindrical lubrication oil holding member which is provided in the through hole and has an inner peripheral surface serving as the second rolling passage and a cylindrical protection member which is provided at an outer periphery of the cylindrical lubrication oil holding member, the lubrication mechanism supplying a lubrication oil to the rolling elements. |
