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:
Nov. 21, 2023
Filed:
Mar. 17, 2020
Thk Co., Ltd., Tokyo, JP;
Yuji Kubota, Tokyo, JP;
Yoshinobu Moriyuki, Tokyo, JP;
THK CO., LTD, Tokyo, JP;
Abstract
A preload detectable screw device is provided which can detect preload with accuracy and can reduce the influence of generated heat on the output of a sensor. A screw device () includes a screw shaft (), a nut member (), a plurality of rolling elements (), at least one axial strain sensor () (B, D) that is attached to a surface of the nut member () and detects strain in an axial direction on the nut member (), and at least one circumferential strain sensor () (A, C) that is attached to the surface of the nut member () and detects strain in a circumferential direction on the nut member (). Preload of the screw device () is detected on the basis of outputs of the axial strain sensor () (B, D) and the circumferential strain sensor () (A, C).