Patent ID: 8051730
Filing Date: 2011-11-08
Classification: F16H,Y10T

Abstract:
1. A ball screw unit with lubrication apparatus, comprising: a screw bolt having a helical rolling groove surrounding along an exterior surface thereof, and a guide groove; a nut having a central drilled hole, and a rolling thread corresponding to said rolling groove of said bolt formed along an interior surface thereof; wherein said rolling groove and said rolling thread are coupled to form a load passage; a plurality of rolling balls rolling along said load passage; and a lubrication apparatus including an enclosure secured to an end portion of said nut movable in an axial direction with said nut, and a guide member; wherein said enclosure has a containment hole to accommodate said guide member, said guide member has a through hole and a helical track wall, said through hole allows said bolt to pass through and has a detent part formed on the interior surface thereof that is engaged with said guide groove, a helical slot is formed in said helical track wall, a grease outlet is provided at the end of said helical slot, and said helical slot and said containment hole of said enclosure forms a helical guide track.