Spindle unit

Details Spindle unit Spindle unit

1993-09-28

1995-02-14

Hannon, Thomas R.

Bearings

Rotary bearing

Antifriction bearing

384493, F16C 3512, F16C 2700

Patent

active

053889177

ABSTRACT:
A spindle unit which can offset any displacement of the spindle due to thermal expansion and which can adjust the preload on the bearings according to the revolving speed of the spindle. Between the outer casing and the spindle are provided a high-rigidity elastic member and a pressure chamber connected to an oil pressure control valve. A displacement sensor provided at the end of the spindle and a tachometer are connected to the pressure control valve. As the revolving speed of the spindle increases, oil pressure is introduced into the pressure chamber to reduce the preload. By reducing the preload, the spindle moves axially, thus offsetting its displacement due to thermal expansion.

REFERENCES:
patent: 3620586 (1971-11-01), Maastricht
patent: 3943803 (1976-03-01), Hafla
patent: 4023868 (1977-05-01), Miki
patent: 4551032 (1985-11-01), Mottershead
patent: 4611934 (1986-09-01), Piotrowski et al.
patent: 5051005 (1991-09-01), Duncan

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