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:
Jun. 24, 2014
Filed:
Apr. 10, 2012
Kensuke Sato, Tsuchiura, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Kouji Ishikawa, Tsuchiura, JP;
Yasuo Okano, Tsuchiura, JP;
Kensuke Sato, Tsuchiura, JP;
Tsuyoshi Nakamura, Tsuchiura, JP;
Kouji Ishikawa, Tsuchiura, JP;
Yasuo Okano, Tsuchiura, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
A hydraulic driving device for a working machine surely prevents behavior of a single rod double acting cylinder not intended by an operator when discharge pressure of a main pump is raised to raise exhaust gas temperature to temperature required for burning particulate matter. A selector valveinterposed between a spool valveand a rod chamber of a single rod double acting cylinderand a section (a filter regeneration time actuation valve, a vehicle body controller) controlling the selector valve, are provided. A switch control section prevents a flow of oil directed from the rod chamber of the cylinder toward the spool valve by actuating the selector valve by a poppet of the selector valve when a by-pass cut valveis controlled to increase a load of an engineto a degree exhaust gas temperature reaches temperature required for burning particulate matter.