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. 26, 2024
Filed:
Nov. 12, 2021
Hitachi Astemo, Ltd., Ibaraki, JP;
Koji Usui, Ibaraki, JP;
Ryo Ueyama, Ibaraki, JP;
Takenori Iso, Ibaraki, JP;
Hiromu Narukawa, Ibaraki, JP;
HITACHI ASTEMO, LTD., Ibaraki, JP;
Abstract
An electric actuator includes an electric motor, a nut, and a screw shaft threadedly inserted through the nut so as to be able to advance and retreat. The threads of the screw shaft include two flanks and a crest portion connecting the two flanks to each other. Grease is used as a lubricant. A groove portion, which is cut out from the crest portion toward a root portion side of the threads and holds grease, is formed on the threads of the screw shaft. Further, a tapered surface is formed at a groove portion side end of at least one of the two flanks, and the tapered surface inclines in a direction away from the groove portion and drags the grease held in the groove portion onto a threadedly engaged portion with the aid of the wedge effect. As a result, the electric actuator can promote lubrication.