Patent ID: 6717310
Filing Date: 2004-04-06
Classification: F16C,G11B,H02K

Abstract:
A spindle motor comprising:a shaft having a large-diameter first section at a first end, and having a small-diameter second section at a second end so as to form a shoulder between said first section and said second section; a disc-shaped flange having a central opening, a first face, and a second face, said second section of said shaft being fitted into said central opening of said flange so as to form a reservoir between said shoulder of said shaft and said second face of said flange, said flange being fixed to said second section at said second end of said shaft, and having an outside diameter larger than an outside diameter of said first section of said shaft; a cylindrical sleeve, said shaft being inserted into said sleeve; a radial bearing space formed between an outer circumferential surface of said shaft and an inner circumferential surface of said sleeve; a rotor hub opposite a first end of said sleeve and fixed to said first end of said shaft; a thrust plate having a first face facing said first face of said flange so as to form a thrust bearing space between said first face of said flange and said first face of said thrust plate; and lubricant retained in said thrust bearing space.