Patent ID: 7341379

Claim:
The pivot assembly for hard disk drive comprising: a first ball bearing having a first inner ring and a first outer ring; a second ball bearing having a second inner ring and a second outer ring; a shaft having an outer surface; a sleeve having a spacer part disposed between the first and second ball bearings; and a seal member press-fitted to the outer surface of the shaft, wherein the first outer ring and the second outer ring contact the spacer part of the sleeve, wherein the seal member presses on the first inner ring, and wherein when a preload is applied to the seal member, the preload is sequentially distributed from the seal member to the first inner ring, the first outer ring, the spacer part and the second outer ring, wherein said seal member further comprises a chamfered edge part in one side and a pointed edge part at the other side; and wherein said pointed edge part is fixed to said outer circumference of said shaft by laser welding after the preload is applied.