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:
Oct. 24, 2017
Filed:
Sep. 10, 2014
Komatsu Ltd., Tokyo, JP;
Yoshiki Kami, Hadano, JP;
Takeo Yamada, Komatsu, JP;
KOMATSU LTD., Tokyo, JP;
Abstract
A work vehicle includes an arm. An arm cylinder drives the arm. A direction control valve operates the arm cylinder by allowing supply of a hydraulic oil to the arm cylinder as a spool moves. An oil path is connected to the direction control valve. A pilot oil for moving the spool flows through the oil path. A proportional solenoid valve for arm excavation is provided in the oil path. An arm control member is provided for an operator to operate drive of the arm. An amount of operation of the arm control member is equal to or smaller than a prescribed value in a first operation state and greater than the prescribed value in a second operation state. A command current instructing an opening of the proportional solenoid valve for arm excavation is set to a constant value in the first operation state.