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:
Sep. 09, 2025
Filed:
Nov. 17, 2022
Komatsu Ltd., Tokyo, JP;
Hideshi Iitani, Tokyo, JP;
Shouta Akazaki, Tokyo, JP;
KOMATSU LTD., Tokyo, JP;
Abstract
An electric cylinder includes a motor that is a driving source, an output shaft configured to rotate in response to driving of the motor, a sun gear coupled to the output shaft and configured to rotate in response to the rotation of the output shaft, a tubular holder disposed adjacent to an axial end surface of the motor and including a fluid accommodation portion that allows a magnetic fluid to be accommodated between the holder and an outer periphery of the sun gear, a pair of magnetic pole pieces provided on an inner peripheral surface of the holder, and a magnet disposed between the pair of magnetic pole pieces and configured to hold the magnetic fluid in the fluid accommodation portion by using an action of a magnetic field.