Patent ID: 8555737
Filing Date: 2013-10-15
Classification: F16H,H02K,Y10T

Abstract:
1. A cylinder device comprising: a hollow shaft motor through which a screw shaft is inserted; a decelerator connected to an output shaft of the hollow shaft motor; a first screw nut that meshes with the screw shaft and that is connected to the decelerator so that a rotational driving force of the hollow shaft motor can be transmitted; a second screw nut that meshes with the screw shaft and that is disposed to face the first screw nut with the hollow shaft motor placed between the first screw nut and the second screw nut so that a rotational driving force of the hollow shaft motor can be transmitted; an internal gear connected to the decelerator; and an external gear that meshes with the internal gear and that is connected to the first screw nut, wherein a rotational driving force of the hollow shaft motor is transmitted to the first screw nut through the external gear and the internal gear.