Patent ID: 7564151
Filing Date: 2009-07-21
Classification: F16H,H02K

Abstract:
1. A linear actuator, comprising: (a) a stator assembly shaped into a cylinder defining a hollow, the stator assembly including a plurality of winding, a plurality of stator yokes each having an array of pole teeth which constitute an inner circumference of the stator assembly, and which are excited by the windings, and a yoke support member formed of resin by injection-molding, and integrally supporting the windings and the stator yokes; (b) a rear end cap disposed at a rear end of the stator assembly, the rear end cap being formed of resin simultaneously and integrally with the yoke support member; (c) a front end member disposed at a front end of the stator assembly, the front end member being formed of resin simultaneously and integrally with the yoke support member; (d) a rotor assembly shaped into a hollow-cylinder, and rotatably housed in the hollow of the stator assembly, the rotor assembly including (e) a bearing member fitted inside the front end member for rotatably supporting the rotor assembly; (f) a disk-shaped stopper member attached to the front end member; (g) an output shaft having a male screw formed at a rearward portion thereof and threadedly engaging with the female screw of the rotor assembly, the output shaft being inserted through the rotor assembly; (h) a stopper pin secured to the output shaft, and axially controlling mode and amount of movement of the output shaft initiated by rotation of the rotor assembly; (i) a housing disposed at a front end of the stator assembly, the housing having a groove formed at its inner circumference so as to extend parallel to the length of the output shaft;