Patent ID: 8162106

Claim:
A ball screw lubricative sealing device comprising: generally cylindrical case members each having an end attached to either end of a screw nut of a ball screw, respectively, using fastening bolts, each fastening bolt including a first end abutting an inner end face of said case member and a second end received in a screw hole of said screw nut; a generally cylindrical thin cap inserted and fixed inside of the other end each of said case members; a plurality of thin seal plates, each having a hole which corresponds to a lateral cross-sectional shape of a screw groove of a ball screw shaft, fitted inside said thin cap by being displaced in respective circumferential direction and stacked together; and a space for a grease reservoir formed inside each of said case members between said plurality of thin seal plates and one end of said screw nut; wherein said plurality of thin seal plates are formed of a lubricating oil impregnated material formed of a polyester fiber material and resilient rubber material, and the outer circumferential surfaces of said plurality of thin seal plates are bonded to an inner circumferential surface of said thin cap using an adhesive.