PRELOAD ADJUSTMENT STRUCTURE OF ROLLING BEARING

Title:

PRELOAD ADJUSTMENT STRUCTURE OF ROLLING BEARING

Document Type and Number:

Japanese Patent JP2008045630

Kind Code:

A

Abstract:

To provide a low-cost and lightweight preload adjustment structure of a rolling bearing, which maintains a stable operation by suppressing a variation in mechanical precision.

A direct drive motor 100 comprises: a cross-roller bearing 14; a housing inner 220 supported by an inner ring 14a; a rotor 12 formed of a material having a coefficient of thermal expansion higher than the cross-roller bearing 14; and supported by an outer ring 14b; and an outer ring holding member 28 for securing the cross-roller bearing 14 in such a state that a preload is applied to the cross-roller bearing 14. The housing inner 220 and a bearing support 240 are also formed of materials having coefficients of thermal expansion higher than the cross-roller bearing 14. Axially-extending notches 240b, 240c are formed in the inner peripheral surface and the outer peripheral surface of the bearing support 240.

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Inventors:

WATANABE ITSUO

Application Number:

JP2006220259A

Publication Date:

February 28, 2008

Filing Date:

August 11, 2006

Export Citation:

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Assignee:

NSK LTD

International Classes:

F16C25/06; F16C19/36

Attorney, Agent or Firm:

Tetsuya Mori
Yoshiaki Naito
Cui Shu Tetsu

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