Manufacturing tool for fluid dynamic bearing

Details Manufacturing tool for fluid dynamic bearing Manufacturing tool for fluid dynamic bearing

2007-08-07

2007-08-07

Tolan, Ed (Department: 3725)

Metal deforming

By use of tool acting during relative rotation between tool...

Tool orbiting or rotating about an axis

C072S118000, C409S259000, C407S013000

Reexamination Certificate

active

11165943

ABSTRACT:
A manufacturing tool (20) for forming a dynamic pressure groove (52) in an inner peripheral surface of a bearing sleeve (50) includes a tool shaft (21) for being rotated in a bore of the bearing sleeve while being moved in an axial direction thereof. Protrusions (25) are integrally and circumferentially arranged on an outer periphery of the tool shaft near a leading end (22) thereof. Machining tips (26) are integrally formed on outmost ends of the protrusions for machining the inner peripheral surface of the bearing sleeve to form the dynamic pressure groove therein.

REFERENCES:
patent: 3824827 (1974-07-01), Stockbridge et al.
patent: 5325695 (1994-07-01), Seo et al.
patent: 5339523 (1994-08-01), Hasegawa
patent: 5758421 (1998-06-01), Asada
patent: 5836077 (1998-11-01), Usui et al.
patent: 5931038 (1999-08-01), Higashi
patent: 6477877 (2002-11-01), Usui

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