Invention Grant
- Patent Title: Hydraulic excavator
- Patent Title (中): 液压挖掘机
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Application No.: US14127652Application Date: 2012-08-13
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Publication No.: US09328480B2Publication Date: 2016-05-03
- Inventor: Teruo Akiyama , Noboru Iida , Kenji Oshima , Kenji Sasano
- Applicant: Teruo Akiyama , Noboru Iida , Kenji Oshima , Kenji Sasano
- Applicant Address: JP Tokyo
- Assignee: KOMATSU LTD.
- Current Assignee: KOMATSU LTD.
- Current Assignee Address: JP Tokyo
- Agency: Global IP Counselors, LLP
- Priority: JP2011-182940 20110824
- International Application: PCT/JP2012/070596 WO 20120813
- International Announcement: WO2013/027618 WO 20130228
- Main IPC: F15B11/00
- IPC: F15B11/00 ; E02F9/20 ; F15B11/17 ; E02F9/12 ; E02F9/22 ; F15B11/02 ; F15B11/028

Abstract:
In a hydraulic excavator, a hydraulic cylinder drives a boom via a hydraulic fluid discharged from a first hydraulic pump. A first hydraulic circuit connects the first hydraulic pump and the hydraulic cylinder and forms a closed circuit therebetween. A hydraulic motor rotates a revolving upper unit with hydraulic fluid discharged from a second hydraulic pump. A second hydraulic circuit independent from the first hydraulic circuit connects the second hydraulic pump and the hydraulic motor. A motor hydraulic pressure reduction unit reduces the driving hydraulic pressure of the hydraulic motor when a predetermined condition is satisfied. The predetermined condition is a condition in which an operation of the boom operating member to raise the boom and an operation of the rotation operating member to rotate the revolving upper unit are conducted together and an operation amount of the boom operating member is equal to or greater than a predetermined threshold.
Public/Granted literature
- US20140123847A1 HYDRAULIC EXCAVATOR Public/Granted day:2014-05-08
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