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. 20, 2011
Filed:
Oct. 14, 2008
Atsushi Kakino, Aichi-ken, JP;
Hiroshi Saito, Aichi-ken, JP;
Kenta Kawasaki, Aichi-ken, JP;
Takashi Oka, Aichi-ken, JP;
Atsushi Kakino, Aichi-ken, JP;
Hiroshi Saito, Aichi-ken, JP;
Kenta Kawasaki, Aichi-ken, JP;
Takashi Oka, Aichi-ken, JP;
Mitsubishi Heavy Industries, Ltd., Tokyo, JP;
Abstract
A double redundancy electro hydrostatic actuator system includes two hydraulic pumps; two fail safe valves connected with the two hydraulic pumps, respectively; one dual tandem hydraulic cylinder connected with the two fail safe valves and having a piston rod, wherein the piston rod is moved by switching supply and discharge of the fluid; two switching valves connected with the two fail safe valves; two accumulators connected with the two switching valves and the two hydraulic pumps, respectively; and two chambers connected with the two switching valves, respectively. Each of the two accumulators accumulates the fluid from a corresponding one of the two hydraulic pumps, and sends the fluid to a corresponding one of the two fail safe valves. The two chambers receive the fluid from the two fail safe valves, respectively.