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. 15, 2020
Filed:
Oct. 30, 2017
Bridgestone Corporation, Tokyo, JP;
Atsushi Nakayama, Higashiyamato, JP;
Yasunori Tarutani, Kokubunji, JP;
Shingo Ohno, Higashimurayama, JP;
Yasuo Fukushima, Kodaira, JP;
BRIDGESTONE CORPORATION, Chuo-ku, Tokyo, JP;
Abstract
Provided is a hydraulic actuator with improved durability, the hydraulic actuator (), having an actuator main body () constituted of a cylindrical tube () capable of expanding/contracting by hydraulic pressure and a cylindrical sleeve () formed by cords () woven to be disposed in predetermined directions, wherein: the average angle (Θ) formed by the cords () with respect to the axis direction (D) of the actuator with no load and no pressure applied thereon is in a range of ≥20° and <45°; and in a state where the average angle (Θ) formed by the cords () with respect to the axis direction (D) is 45° under hydraulic pressure of 5 MPa, a ratio (S/S) of the total area (S) of clearances () between the cords () with respect to an area (S) of an outer peripheral surface of the actuator main body () is 35% or less.