| 摘要 |
PROBLEM TO BE SOLVED: To suppress deflection of a shaft in an actuator constituted by combining a plurality of gears.SOLUTION: In an actuator including a first gear having an input shaft, a second gear having a first gear wheel disposed at one end side of a shaft, a second gear wheel disposed at the other end side of the shaft, and a cylindrical portion disposed between the first gear wheel and the second gear wheel, and a third gear having an output shaft, and transmitting rotation of the input shaft to the output shaft by engagement of the first gear and the first gear wheel, and engagement of the third gear and the second gear wheel, a restricting portion for restricting movement of the cylindrical portion of the second gear is disposed. During an operation of the actuator, deflection force is added to the shaft of the second gear, and the cylindrical portion is moved by deflection of the shaft. But the cylindrical portion cannot be moved by the restricting portion, and a deflection amount of the shaft is suppressed. As the shaft is deflected even the shaft is made of a resin, a problem on poor engagement of the gears can be prevented.SELECTED DRAWING: Figure 2 |
