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Patent Searching and Data

Document Type and Number:
WIPO Patent Application WO/2019/151099
Kind Code:
The purpose of the present invention is to provide a speed reduction device which has a small size and with which a high speed reduction ratio can be obtained, and high rotational accuracy and the suppression of vibration can be achieved. This speed reduction device 1 is characterized by comprising: an input-side rotary member 2 having a first ball engagement recess 13 formed therein; an output-side rotary member 3 coaxially arranged with a rotary shaft 7 of the input-side rotary member 2 and having a second ball engagement recess 16 formed therein; a plurality of balls 4 that engage with the two ball engagement recesses 13, 16 facing each other in the axial direction; and a retainer 5 having a plurality of pockets 17 that hold the balls 4 so that the balls 4 can move in a radial direction, wherein the retainer 5 is provided so as not to be rotatable with respect to the rotary shaft 7, the rotation of the input-side rotary member 20 is reduced in speed and transmitted to the output-side rotary member 3 through the balls 4 engaging with the two ball engagement recesses 13, 16, and a surface treatment or a material which has a smaller friction coefficient with the balls than that of the contact between the balls and the ball engagement recesses is used on at least the surface of the member that constitutes the pockets of the retainer.

IGI Taisuke (1578 Higashikaizuka, Iwata-sh, Shizuoka 10, 〒4388510, JP)
Application Number:
Publication Date:
August 08, 2019
Filing Date:
January 24, 2019
Export Citation:
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NTN CORPORATION (3-17, Kyomachibori 1-chome Nishi-ku, Osaka-sh, Osaka 03, 〒5500003, JP)
International Classes:
F16H1/32; F16H25/06
Foreign References:
Attorney, Agent or Firm:
TORII Kazuhisa et al. (PATRIO Patent Office, Hommachi Takeda Building 1-29, Kyutaro-machi 3-chome, Chuo-Ku, Osaka-sh, Osaka 56, 〒5410056, JP)
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