| 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 work shaft that is coupled with the ball screw nut so as to linearly move together with the ball screw nut, and has a tool attached to a leading end of the work shaft; a slider that is fastened to the work shaft and comprises a first groove formed along an actuation direction of the work shaft; a rail that faces with the first groove and comprises a second groove formed along the actuation direction of the work shaft, and formed of a rigid material; and a rolling element that is formed of a rigid material, rolls over the first groove and the second groove upon being held between the first groove and the second groove, and supports the slider in a movable manner.
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