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Patent Searching and Data


Title:
SUPPORT STRUCTURE OF BALL SCREW SHAFT
Document Type and Number:
Japanese Patent JP2005233358
Kind Code:
A
Abstract:

To provide an inexpensive and compact support structure of a ball screw shaft without impairing reliability and durability.

In this support structure of the ball screw shaft, a ball screw shaft 1 is rotatably supported on a housing through a rolling bearing 3. A fitting part 3 is formed on the end part of the ball screw shaft 1 to have a smaller diameter than the core diameter of a thread groove of the ball screw shaft 1, and the rolling bearing 3 is pressed in the fitting part 2 with a predetermined interference so that the maximum hoop stress of an inner ring 7 is 180 N/mm2 or less. The support structure includes the rolling bearing 3 and a fixed ring 5 mounted on the fitting part 2, wherein an annular groove 4 having a predetermined angle α of inclination so that the side wall 4a of the end face side is flared toward the outside diameter side is formed on the fitting part 2, and the fixed ring 5 formed of a rod material having a circular section, whose line diameter is a little larger than an annular clearance between the side wall 4a and the inside diameter chamfer 7a of the inner ring 7 is mounted in the annular groove 4.


Inventors:
Kazuno, Keisuke
Application Number:
JP2004000045614
Publication Date:
September 02, 2005
Filing Date:
February 23, 2004
Export Citation:
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Assignee:
NTN CORP
International Classes:
F16C35/073; F16B4/00; F16H25/22; F16H25/24; (IPC1-7): F16H25/24; F16B4/00; F16C35/073; F16H25/22
Attorney, Agent or Firm:
越川 隆夫