Patent ID: 6041672
Filing Date: 2000-03-28
Classification: F16H,Y10T

Abstract:
A recirculation ball-screw device, comprising:a screw rod having an external thread formed thereon;a longitudinally extended bearing seat having a substantially cylindrical wall and a threaded bore extending between opposing longitudinal ends thereof for threadedly receiving said screw rod therein, said external thread of said screw rod being engaged with threads of said threaded bore and having a receiving space therebetween, said bearing seat having an arcuate guiding groove formed in an outer surface of said wall and a pair of through holes respectively formed in said wall in open communication with said threaded bore at opposing longitudinally spaced ends of said guiding groove;a plurality of balls disposed in said receiving space to form bearing surfaces between said screw rod and said bearing seat and disposed in said guiding groove;a pair of stopping screws respectively affixed through said wall adjacent said pair of through holes for limiting displacement of said plurality of balls within said receiving space during rotation of said screw rod and redirecting said balls through a respective one of said through holes into said guiding groove in correspondence with a direction of said screw rod's rotation;a pair of guiding members secured to said bearing seat, each of said guiding members having an inclined end portion positioned over a respective one of said through holes for guiding said balls into said guiding groove; and,a tubular sleeve having a through bore for receiving said bearing seat therein and thereby forming a cover for said guiding groove, wherein balls displaced from said receiving space through one of said through holes as said screw rod is rotated are displaced through said guiding groove and returned to said receiving space through said other of said through holes.