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. 25, 2013
Filed:
Mar. 12, 2008
Koji Hyodo, Kasumigaura, JP;
Kazuo Ishida, Ryugasaki, JP;
Tsuyoshi Takeyama, Ryugasaki, JP;
Tadayoshi Aoki, Ryugasaki, JP;
Takehiko Katsuragi, Kasumigaura, JP;
Shoroku Kawahara, Ryugasaki, JP;
Koji Hyodo, Kasumigaura, JP;
Kazuo Ishida, Ryugasaki, JP;
Tsuyoshi Takeyama, Ryugasaki, JP;
Tadayoshi Aoki, Ryugasaki, JP;
Takehiko Katsuragi, Kasumigaura, JP;
Shoroku Kawahara, Ryugasaki, JP;
Hitachi Construction Machinery Co., Ltd., Tokyo, JP;
Abstract
There are provided: an HST hydraulic circuit that is formed through a closed circuit connection of a variable displacement hydraulic pumpand first and second variable displacement hydraulic motorsand; a charge pumpthat replenishes the HST hydraulic circuit with hydraulic oil; a cooling circuit through which an excess of the hydraulic oil that has been replenished from the charge pumpto the HST hydraulic circuit is returned to a reservoir through the hydraulic pump, the first hydraulic motor, and the second hydraulic motor; a hydraulic sourcethat supplies hydraulic oil to an hydraulic device other than the first and second hydraulic motors; and a merge circuit through which a portion of hydraulic oil from the hydraulic sourceis merged into an intermediate oil linethat lies downstream of the first hydraulic motorand upstream of the second hydraulic motorin the cooling circuit.