Title:
BALL SCREW DEVICE AND ELECTRIC ACTUATOR PROVIDED WITH SAME
Document Type and Number:
WIPO Patent Application WO/2023/140076
Kind Code:
A1
Abstract:
In this ball screw device 4 comprising: a screw shaft 9 having a thread groove 9a formed on an outer peripheral surface thereof; a nut 8 having a thread groove 8a formed on an inner peripheral surface thereof; and a large number of balls 10 arranged between the thread groove 9a of the screw shaft 9 and the thread groove 8a of the nut 8, a ratio Δr/L1 between a radial gap Δr, which is the maximum amount of radial movement of the nut 8 relative to the screw shaft 9, and the axial span L1 of the large number of balls 10 is made larger than 1/2000.
Inventors:
OKU YUTA (JP)
KATO AKIO (JP)
KATO AKIO (JP)
Application Number:
PCT/JP2022/048355
Publication Date:
July 27, 2023
Filing Date:
December 27, 2022
Export Citation:
Assignee:
NTN TOYO BEARING CO LTD (JP)
International Classes:
F16H25/24; F16H25/22
Foreign References:
| JP2018074791A | 2018-05-10 | |||
| JP2005344831A | 2005-12-15 |
Attorney, Agent or Firm:
SHIROMURA Kunihiko et al. (JP)
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