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Title:
THREADED SHAFT, METHOD FOR MANUFACTURING THE SAME, AND BALL SCREW UNIT
Document Type and Number:
Japanese Patent JP2013099840
Kind Code:
A
Abstract:

To provide a high-accuracy and high-strength hollow threaded shaft with a low wall thickness, a method for manufacturing the same, and a small and light-weight ball screw unit.

The method for manufacturing the threaded shaft includes steps of rolling the outer periphery of a rod-shaped steel material 20 to form helical thread grooves 3a, applying heat treatment to the outer periphery, boring the heat-treated rod-shaped material 20 to form into a tubular shape, thus manufacturing the hollow threaded shaft 3. The hardness of a thread groove surface of the threaded shaft 3 is higher than Hv600, the hardness of the inner periphery is higher than Hv180 and lower than Hv400, and the wall thickness is 0.65 mm or larger and 50% or smaller in an inner radius. A ball screw 1 provided with the threaded shaft 3 is combined with rolling bearings 30, a fixing shaft 32, and contents of a motor 38 to form the ball screw unit. The contents are included in a hollow part of the threaded shaft 3.


Inventors:
Sakai, Motoshi
Saito, Shingo
Hashimoto, Koji
Application Number:
JP2012000225039
Publication Date:
May 23, 2013
Filing Date:
October 10, 2012
Export Citation:
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Assignee:
NSK LTD
International Classes:
B23P13/00; B21H3/02; F16H25/22
Attorney, Agent or Firm:
森 哲也
小西 恵
田中 秀▲てつ▼
廣瀬 一
宮坂 徹