Actuator

摘要

An actuator (10) includes a guide apparatus (30) that guides a rod 11 in a Y-axis direction. The guide apparatus (30) includes a slider (31), a rail (60) formed of a steel material, and balls (rolling elements) formed of a steel material. The slider (31) is supported by the rail (60) through the balls. Accordingly, even if torque originating from a rotation of the output shaft of a motor unit (20) is applied to the slider (31) through a ball screw shaft (71), the slider (31) does not move around the output shaft with respect to the rail (60). Hence, torque originating from the rotation of the output shaft is not likely to be transmitted to the rod (11) through the guide apparatus (30), thereby suppressing an occurrence of the wobbling of the leading end of the rod (11). In addition, a reduction of the work precision of the actuator (10) is preventable.

主权项

1. An actuator comprising:
a motor including a rotation shaft; a ball screw comprising a ball screw shaft that rotates together with a rotation of the rotation shaft, and a ball screw nut that linearly moves together with a rotation of the ball screw shaft; a guide apparatus comprising a slider that is coupled with the ball screw nut so as to linearly move together with the ball screw nut, and that is provided with a through-hole and first grooves running along the direction that the slider linearly moves; a rail that faces the first grooves and is provided with second grooves running along the direction that the slider linearly moves; and a rolling element that rolls over the first grooves and the second grooves upon being held between the first grooves and the second grooves, and supports the slider in a movable manner; and a work shaft that is fastened to the through-hole provided in the slider of the guide apparatus.