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Title:
BALL SCREW, MACHINE TOOL, AND CONVEYING DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/010407
Kind Code:
A1
Abstract:
Provided are a ball screw, a machine tool, and a conveying device with which vibration is minimized even when a nut is rotated at high speeds, and manufacturing costs are reduced. To achieve this, the ball screw (1) has a screw shaft (10), a nut body (20A), a rolling element (30), a covering member (40) made of a synthetic plastic, and a circulating member (50). The covering member (40) has a cylindrical shape placed coaxially with the nut body (20A) so as to cover the outer peripheral surface of the nut body (20A). A rolling element return path (70) is constituted of a groove part (41) formed in the inner peripheral surface of the covering member (40), and the outer peripheral surface (20a) of the nut body (20A). The covering member (40) is provided with an engaging part (43) that engages with a notched part (53) formed in the outer peripheral surface of the circulating member (50).

Inventors:
MORIYAMA MASAHITO (JP)
Application Number:
PCT/JP2016/070177
Publication Date:
January 19, 2017
Filing Date:
July 07, 2016
Export Citation:
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Assignee:
NSK LTD (JP)
International Classes:
F16H25/22
Foreign References:
JP2008163968A2008-07-17
JPS5440951A1979-03-31
JP2010190367A2010-09-02
JPH04285352A1992-10-09
Other References:
See also references of EP 3324077A4
Attorney, Agent or Firm:
MORI Tetsuya et al. (JP)
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