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Patent Searching and Data


Title:
BALL SCREW
Document Type and Number:
WIPO Patent Application WO/2017/051799
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a deflector-type ball screw capable of improving durability with respect to radial loads and moment loads without enlarging the overall shape or providing multiple deflector members. The present invention is a ball screw nut (3) in which a threaded shaft (4) is inserted in a nut (6), multiple balls (7) are disposed in rolling tracks configured from shaft-side thread grooves (4A) of the threaded shaft (4) and nut-side thread grooves (6A) of the nut (6), and the threaded shaft (4) or the nut (6) is provided with a deflector member (15) in which multiple circulation grooves that make the rolling tracks into circling paths are formed. In the ball screw nut: one circumferential direction end of at least one of the multiple circulation grooves is disposed at a position that is shifted in one circumferential direction or the other with respect to the one circumferential direction ends of the other multiple circulation grooves.

Inventors:
SHIMIZU TATSUNORI (JP)
Application Number:
PCT/JP2016/077701
Publication Date:
March 30, 2017
Filing Date:
September 20, 2016
Export Citation:
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Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
F16H25/22
Foreign References:
JP2001132811A2001-05-18
JP2012077871A2012-04-19
Other References:
See also references of EP 3354932A4
Attorney, Agent or Firm:
YANO Juichiro (JP)
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