Method of manufacturing a thrust plate, method of manufacturing a shaft for a hydrodynamic bearing, hydrodynamic bearing, spindle moto
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United States of America Patent
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Dec 14, 2004
Grant Date -
Oct 2, 2003
app pub date -
Mar 7, 2003
filing date -
Mar 26, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method of manufacturing a thrust plate for a dynamic pressure bearing in which the upper and lower end surfaces thereof have a highly precise perpendicular angle relative to the central axis thereof. The thrust plate has an annular shape, and a central hole is formed therein in which is fitted a shaft body. Thrust surfaces that form a portion of thrust bearing units are formed at both end surfaces of the thrust plate. The method of manufacturing the thrust plate includes a blanking step in which a plate-like work piece is press-cut to obtain an annular blank intermediate, an end surface polishing step in which both end surfaces of the blank intermediate are polished, and a shaving step in which an inner hole and an outer periphery of the polished blank intermediate are simultaneously press-cut to shave off surfaces thereof.
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