PRELOAD ADJUSTMENT METHOD AND DEVICE FOR ROLLING BEARING

Title:

PRELOAD ADJUSTMENT METHOD AND DEVICE FOR ROLLING BEARING

Document Type and Number:

WIPO Patent Application WO/2008/050470

Kind Code:

A1

Abstract:

A preload adjustment method capable of adjusting preload on a rolling bearing for supporting a main spindle etc. of a machine tool. The adjustment is made without a reduction in rigidity of the bearing relative to external force acting in the radial direction. A bearing device (2) to which the method is applied has rolling bearings (3, 4, 4) for supporting a shaft (1), a bearing box (5), in the bore surface of which the outer rings (3a, 4a, 4a) of the rolling bearings (3, 4, 4) are fitted, cooling flow paths (21A, 21B) for cooling the bearing box (5), and a cooling oil supply device (22) for supplying cooling oil to the cooling flow paths (21A, 21B). The method causes the bearing box (5) to have a temperature change by controlling the flow rate of the cooling oil supplied from the cooling oil supply device (22) to the cooling flow paths (21A, 21B). Thermal expansion and contraction of the bearing box (5) caused by the temperature change changes redial clearances of the bearings (3, 4, 4) fitted in the bore surface of the bearing box, and by this, preload is adjusted.

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Inventors:

MORI MASATSUGU (JP)

Application Number:

PCT/JP2007/001084

Publication Date:

May 02, 2008

Filing Date:

October 04, 2007

Export Citation:

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Assignee:

NTN TOYO BEARING CO LTD (JP)
MORI MASATSUGU (JP)

International Classes:

F16C25/08; F16C37/00

Foreign References:

JPH06134651A	1994-05-17
JP2001208088A	2001-08-03
JPH0373205A	1991-03-28
JPH11315829A	1999-11-16
JPH08177852A	1996-07-12
JP2002054629A	2002-02-20