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Patent Searching and Data


Title:
BRIDGE-TYPE BALL SCREW AND METHOD FOR MANUFACTURING SAME
Document Type and Number:
WIPO Patent Application WO/2016/125825
Kind Code:
A1
Abstract:
Provided is an inexpensive, highly reliable bridge-type ball screw in which the step of a ball transfer part is eliminated and smoothed out to prevent abnormal sounds, and durability is improved. A method for manufacturing a bridge-type ball screw 1 provided with a bridge member 5 which is fitted into a bridge window 6 formed in the body of a nut 3, the bridge member 5 having a linking groove 5a that has a rolling track as a circuital path in the inner periphery, wherein: after the bridge member 5 is fitted into the bridge window 6 of the nut 3, a columnar mandrel 8 having a projection 9 is inserted into the nut 3; with the mandrel 8 supported while horizontal, an upper die 10 arranged radially outward from the nut 3 is lowered, the upper die 10 restraining the upper surface of the bridge member 5; the upper die 10 is lowered while the nut 3 is held between the upper die 10 and the mandrel 8; a connecting part between the linking groove 5a of the bridge member 5 and a thread groove 3a of the nut 3 is subjected to plastic working by the projection 9 of the mandrel 8; the outer-peripheral part of the bridge member 5 is simultaneously plastically deformed by the upper die 10; and the bridge member 5 is secured by caulking in the bridge window 6 of the nut 3.

Inventors:
SHIMIZU, Tatsunori (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
Application Number:
JP2016/053208
Publication Date:
August 11, 2016
Filing Date:
February 03, 2016
Export Citation:
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Assignee:
NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
International Classes:
F16H25/22; B21D39/00; B21K1/70; B22F3/02; F16H25/24
Foreign References:
JP2005121042A2005-05-12
JP2008281063A2008-11-20
JP2008286353A2008-11-27
JP2005299719A2005-10-27
Attorney, Agent or Firm:
KOSHIKAWA, Takao (19F, Hamamatsu Act Tower 111-2, Itayamachi, Naka-ku, Hamamatsu-sh, Shizuoka 91, 〒4308691, JP)
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