Patent ID: 6848327
Filing Date: 2005-02-01
Classification: F16C,F16H,Y10T

Abstract:
1. An actuator comprising: a frame; a driving source for generating a driving force; a feed screw shaft mechanism for transmitting said driving force of said driving source, said feed screw shaft mechanism being assembled into a single unit including a feed screw shaft and a feed screw nut and detachably installed to said frame; a slider having an opening for receiving said feed screw shaft and said feed screw nut therein, said slider being capable of reciprocating in an axial direction of said frame under an action of said driving force transmitted by said feed screw shaft mechanism; and a guide mechanism for guiding said slider when said slider is displaced along said frame, wherein said guide mechanism includes plates and covers which are connected to and move together with said slider, and ball return guides which are installed to side surfaces of said slider and accommodated within said covers, wherein said opening extends in said axial direction, and includes a rounded inner surface having an upwardly oriented U-shaped cross-section, and said slider has a hole which penetrates downwardly from said opening to said frame, and wherein said feed screw nut, which is received in said opening, is a ball screw nut having a cylindrical section having a penetrating screw hole, and a pair of flange sections which are formed integrally at one end of said cylindrical section and which are fixed to a side surface portion of said slider, such that said cylindrical section is insertable into and removable from said slider through said opening from an upper side of said slider when said slider is accommodated in said frame.