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Patent Searching and Data


Title:
STATIC PRESSURE JOURNAL BEARING SPINDLE
Document Type and Number:
Japanese Patent JP2011208724
Kind Code:
A
Abstract:

To provide a static pressre journal bearing spindle having high rotating accuracy preventing transmission of the heat generated in a motor or the like to a rotating table on a side opposite to the motor through a spindle, preventing thermal expansion of the spindle, and further, and measurable by an electrostatic capacity type non-contact meter in a state of using a non-conductive material.

This static pressure journal bearing spindle includes: the spindle 2; an static pressure journal bearing 3 rotatably supporting the spindle 2; the motor 4 having a motor shaft 2c formed of an end of the spindle 2 and driving the spindle 2 to rotate; and a rotating table 5 fixed to the other end of the spindle 2. A spindle supported part 2a as a part of the spindle 2 rotatably supported by the static pressure journal bearing 3 and a spindle table side part 2b of the spindle 2 as a part on a rotating table 5 side than the spindle supported part 2a are respectively formed from a ceramics material, and a radial bearing part 3b of the spindle supported part 2a is plated with a conductive plate.


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Inventors:
Horiuchi, Teruyoshi
Kitahara, Hiroaki
Application Number:
JP2010000076938
Publication Date:
October 20, 2011
Filing Date:
March 30, 2010
Export Citation:
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Assignee:
NTN CORP
PIONEER ELECTRONIC CORP
International Classes:
F16C32/06; G03F7/20