公开(公告)号：US11072910B2

公开(公告)日：2021-07-27

申请号：US15758059

申请日：2017-06-27

Applicant: KOMATSU LTD.

Inventor： Takeo Yamada ,  Shota Nakamura ,  Gousuke Nakashima

IPC: E02F9/22 ,  E02F3/32 ,  E02F3/42 ,  E02F9/16 ,  F15B13/06

Abstract: A plurality of electromagnetic proportional control valves are configured to control a pressure of a pilot oil generated by operation of a first control lever device and a second control lever device and, in accordance with the pressure of the pilot oil, adjust a flow rate of a hydraulic oil supplied to hydraulic cylinders. The plurality of electromagnetic proportional control valves are divided into a first valve block including at least one of the electromagnetic proportional control valves and a second valve block including at least one of the electromagnetic proportional control valves. The first valve block and the second valve block are arranged to be separated from each other.

公开(公告)号：US20240183126A1

公开(公告)日：2024-06-06

申请号：US18285266

申请日：2022-06-15

Applicant: Komatsu Ltd.

Inventor： Satoshi Ito ,  Shota Nakamura

IPC: E02F9/20 ,  E02F9/22 ,  E02F9/26

CPC classification number: E02F9/2033 ,  E02F9/2066 ,  E02F9/2228 ,  E02F9/2235 ,  E02F9/2296 ,  E02F9/268

Abstract: A work machine having working equipment includes a power source that outputs a driving force for operating the working equipment, a controller, and a solenoid valve controlled by the controller. When it is determined that an abnormality has occurred in the power supply circuit connecting the controller and the solenoid valve, the controller outputs a command for controlling the power source so as to limit an operation of the working equipment.