Patent ID: 7415758

Claim:
A device to press a shaft rotatably supporting a rotor of a spindle motor for a hard disk drive into a shaft receiving portion of an associated stator housing non-rotatably receiving said shaft, comprising: a first pressing tool, a second pressing tool, a first aligning apparatus for the rotor and a second aligning apparatus for the stator housing, the first and the second aligning apparatus adapted to guide the rotor in a precisely aligned state at least from a start of the pressfitting process with a precision-related surface of the rotor engaging against a first support surface of a rotor carrier of the first aligning apparatus, and guide the stator housing in a precisely aligned state at least from the start of the pressfitting process with one or more precision-related surfaces of the stator housing abutting a second support surface of a stator carrier of the second aligning apparatus, said rotor carrier and said stator carrier being exactly aligned with respect to each other during the pressfitting process, the first pressing tool having a first pressing element acting on the shaft of the rotor independent of the first aligning apparatus and the second pressing tool having a second pressing element acting on the stator housing independent of the second aligning apparatus, the first and second pressing elements abutting against the shaft or the stator housing respectively at least at the start of the pressfitting process.