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:
Jul. 11, 2017
Filed:
Sep. 05, 2014
Applicant:
Komatsu Ltd., Tokyo, JP;
Inventors:
Toru Matsuyama, Naka-gun, JP;
Takeshi Takaura, Minoh, JP;
Assignee:
KOMATSU LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
E02F 9/22 (2006.01); E02F 3/43 (2006.01); E02F 9/26 (2006.01); E02F 3/32 (2006.01);
U.S. Cl.
CPC ...
E02F 9/2228 (2013.01); E02F 3/32 (2013.01); E02F 3/435 (2013.01); E02F 3/437 (2013.01); E02F 9/2207 (2013.01); E02F 9/2267 (2013.01); E02F 9/2285 (2013.01); E02F 9/2292 (2013.01); E02F 9/262 (2013.01); E02F 9/265 (2013.01);
Abstract
There is provided a hydraulic excavator in which the highly-accurate land leveling work is possible. A boom-lowering pilot conduit connected to a boom-lowering pilot port is provided with a boom-lowering proportional solenoid valve. When an arm dump signal for performing dump operation of an arm is included in a hydraulic pressure signal, a controller sharply increases a current value outputted to the boom-lowering proportional solenoid valve, as compared with when an arm excavation signal for performing excavation operation of the arm is included in the hydraulic pressure signal.