Patent ID: 6880676

Claim:
A feed screw device comprising: a screw shaft; a nut member threadably engaging an outer periphery of the screw shaft; a lubricant supply device having an insertion hole formed in an outer periphery side thereof, said lubricant supply device coming in contact with the outer peripheral surface of said screw shaft, such that a portion of said lubricant supply device which contacts the outer peripheral surface of the screw shaft comprises a material including a lubricant; a retaining ring for retaining said lubricant supply device, said retaining ring extends radially beyond the lubricant supply device; and a projection formed on said retaining ring and disposed so as to be received in the insertion hole, such that said projection extends circumferentially less than all of the way around said screw shaft, wherein the retaining ring is fastened to an outside circumferential end face of the nut member.