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Title:
BALL SCREW DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/188238
Kind Code:
A1
Abstract:
In a ball screw device with which it is possible for a ball preload amount to be appropriately managed, and with which it is possible for balls to be re-preloaded when the preload has been lost, without a nut member being taken off a screw shaft, the nut member (3) is provided with a first nut element (31) and a second nut element (32) disposed in series with one another with respect to the screw shaft, a rotation preventing member (34) which synchronizes a rotating motion of the first nut element and the second nut element around the screw shaft, and a spacer (33) which is disposed between the first nut and the second nut elements, and which presses the nut elements in mutually opposite axial directions, wherein the spacer is formed by combining a fixed plate (33a) and an adjusting plate (33b) which are formed in a ring shape and through which the screw shaft is inserted, and wherein the ball preload amount can be varied by rotating the adjusting plate in the circumferential direction of the screw shaft relative to the fixed plate.

Inventors:
YASUTAKE Hiroyoshi
YAMAKOSHI Ryuichi
SEKI Masayuki
OZEKI Ryunosuke
EBINA Takahiro
KUSHIDA Kotaro
MIURA Mihoko
Application Number:
JP2019/009891
Publication Date:
October 03, 2019
Filing Date:
March 12, 2019
Export Citation:
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Assignee:
THK CO., LTD. (12-10, Shibaura 2-chome Minato-k, Tokyo 06, 〒1088506, JP)
International Classes:
F16H25/22
Foreign References:
JP2007285350A2007-11-01
JPH0539835A1993-02-19
JP2000356219A2000-12-26
JPH0266715U1990-05-21
JPS4123836Y11966-12-03
DE1936546A11971-01-28
Attorney, Agent or Firm:
IDE Tetsuroh (5th Floor, Evers No.8 Kannai Bldg. 4-4, Hagoromo-cho 2-chome, Naka-ku, Yokohama-sh, Kanagawa 47, 〒2310047, JP)
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