The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 08, 2022
Filed:
Dec. 11, 2018
Applicants:
Thk Co., Ltd., Tokyo, JP;
Disco Corporation, Tokyo, JP;
Inventors:
Yoshiyuki Honjo, Tokyo, JP;
Shuhei Yamanaka, Tokyo, JP;
Katsuya Iida, Tokyo, JP;
Satoshi Takahashi, Tokyo, JP;
Assignees:
THK CO., LTD., Tokyo, JP;
DISCO CORPORATION, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
F16H 25/20 (2006.01); F16H 25/22 (2006.01); F16H 25/24 (2006.01); H02P 29/024 (2016.01);
U.S. Cl.
CPC ...
F16H 25/2214 (2013.01); F16H 25/24 (2013.01); F16H 2025/2075 (2013.01); H02P 29/024 (2013.01);
Abstract
An object of the present invention is to preferably detect the failure accompanied with the decrease in the pre-load in a ball screw unit. The failure diagnosis is performed for the ball screw unit on the basis of a combination of a resonance frequency in an axial direction of a predetermined machine assembly including the ball screw unit and a motor and a position of a nut member on a screw shaft corresponding to the resonance frequency as provided when the screw shaft is driven and rotated by the motor.